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 } 524 525 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 526 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 527 } else { 528 if (hlen == sizeof(struct ip)) { 529 sum = in_cksum_hdr(ip); 530 } else { 531 sum = in_cksum(m, hlen); 532 } 533 } 534 if (__predict_false(sum)) { 535 IPSTAT_INC(ips_badsum); 536 goto bad; 537 } 538 539 ip_len = ntohs(ip->ip_len); 540 if (__predict_false(ip_len < hlen)) { 541 IPSTAT_INC(ips_badlen); 542 goto bad; 543 } 544 545 /* 546 * Check that the amount of data in the buffers 547 * is as at least much as the IP header would have us expect. 548 * Trim mbufs if longer than we expect. 549 * Drop packet if shorter than we expect. 550 */ 551 if (__predict_false(m->m_pkthdr.len < ip_len)) { 552 tooshort: 553 IPSTAT_INC(ips_tooshort); 554 goto bad; 555 } 556 if (m->m_pkthdr.len > ip_len) { 557 if (m->m_len == m->m_pkthdr.len) { 558 m->m_len = ip_len; 559 m->m_pkthdr.len = ip_len; 560 } else 561 m_adj(m, ip_len - m->m_pkthdr.len); 562 } 563 564 /* 565 * Try to forward the packet, but if we fail continue. 566 * ip_tryforward() may generate redirects these days. 567 * XXX the logic below falling through to normal processing 568 * if redirects are required should be revisited as well. 569 * ip_tryforward() does inbound and outbound packet firewall 570 * processing. If firewall has decided that destination becomes 571 * our local address, it sets M_FASTFWD_OURS flag. In this 572 * case skip another inbound firewall processing and update 573 * ip pointer. 574 */ 575 if (V_ipforwarding != 0 576 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 577 && (!IPSEC_ENABLED(ipv4) || 578 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 579 #endif 580 ) { 581 /* 582 * ip_dooptions() was run so we can ignore the source route (or 583 * any IP options case) case for redirects in ip_tryforward(). 584 */ 585 if ((m = ip_tryforward(m)) == NULL) 586 return; 587 if (m->m_flags & M_FASTFWD_OURS) { 588 m->m_flags &= ~M_FASTFWD_OURS; 589 ip = mtod(m, struct ip *); 590 goto ours; 591 } 592 } 593 594 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 595 /* 596 * Bypass packet filtering for packets previously handled by IPsec. 597 */ 598 if (IPSEC_ENABLED(ipv4) && 599 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 600 goto passin; 601 #endif 602 603 /* 604 * Run through list of hooks for input packets. 605 * 606 * NB: Beware of the destination address changing (e.g. 607 * by NAT rewriting). When this happens, tell 608 * ip_forward to do the right thing. 609 */ 610 611 /* Jump over all PFIL processing if hooks are not active. */ 612 if (!PFIL_HOOKED_IN(V_inet_pfil_head)) 613 goto passin; 614 615 odst = ip->ip_dst; 616 if (pfil_mbuf_in(V_inet_pfil_head, &m, ifp, NULL) != 617 PFIL_PASS) 618 return; 619 620 ip = mtod(m, struct ip *); 621 dchg = (odst.s_addr != ip->ip_dst.s_addr); 622 623 if (m->m_flags & M_FASTFWD_OURS) { 624 m->m_flags &= ~M_FASTFWD_OURS; 625 goto ours; 626 } 627 if (m->m_flags & M_IP_NEXTHOP) { 628 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 629 /* 630 * Directly ship the packet on. This allows 631 * forwarding packets originally destined to us 632 * to some other directly connected host. 633 */ 634 ip_forward(m, 1); 635 return; 636 } 637 } 638 passin: 639 /* 640 * The unspecified address can appear only as a src address - RFC1122. 641 * 642 * The check is deferred to here to give firewalls a chance to block 643 * (and log) such packets. ip_tryforward() will not process such 644 * packets. 645 */ 646 if (__predict_false(ntohl(ip->ip_dst.s_addr) == INADDR_ANY)) { 647 IPSTAT_INC(ips_badaddr); 648 goto bad; 649 } 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 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 if (ro.ro_nh->nh_flags & (NHF_BLACKHOLE | NHF_BROADCAST)) { 952 IPSTAT_INC(ips_cantforward); 953 m_freem(m); 954 NH_FREE(ro.ro_nh); 955 return; 956 } 957 if (ro.ro_nh->nh_flags & NHF_REJECT) { 958 IPSTAT_INC(ips_cantforward); 959 NH_FREE(ro.ro_nh); 960 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 961 return; 962 } 963 ia = ifatoia(ro.ro_nh->nh_ifa); 964 } else 965 ia = NULL; 966 /* 967 * Save the IP header and at most 8 bytes of the payload, 968 * in case we need to generate an ICMP message to the src. 969 * 970 * XXX this can be optimized a lot by saving the data in a local 971 * buffer on the stack (72 bytes at most), and only allocating the 972 * mbuf if really necessary. The vast majority of the packets 973 * are forwarded without having to send an ICMP back (either 974 * because unnecessary, or because rate limited), so we are 975 * really we are wasting a lot of work here. 976 * 977 * We don't use m_copym() because it might return a reference 978 * to a shared cluster. Both this function and ip_output() 979 * assume exclusive access to the IP header in `m', so any 980 * data in a cluster may change before we reach icmp_error(). 981 */ 982 mcopy = m_gethdr(M_NOWAIT, m->m_type); 983 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 984 /* 985 * It's probably ok if the pkthdr dup fails (because 986 * the deep copy of the tag chain failed), but for now 987 * be conservative and just discard the copy since 988 * code below may some day want the tags. 989 */ 990 m_free(mcopy); 991 mcopy = NULL; 992 } 993 if (mcopy != NULL) { 994 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 995 mcopy->m_pkthdr.len = mcopy->m_len; 996 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 997 } 998 #ifdef IPSTEALTH 999 if (V_ipstealth == 0) 1000 #endif 1001 ip->ip_ttl -= IPTTLDEC; 1002 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1003 if (IPSEC_ENABLED(ipv4)) { 1004 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 1005 /* mbuf consumed by IPsec */ 1006 RO_NHFREE(&ro); 1007 m_freem(mcopy); 1008 if (error != EINPROGRESS) 1009 IPSTAT_INC(ips_cantforward); 1010 return; 1011 } 1012 /* No IPsec processing required */ 1013 } 1014 #endif /* IPSEC */ 1015 /* 1016 * If forwarding packet using same interface that it came in on, 1017 * perhaps should send a redirect to sender to shortcut a hop. 1018 * Only send redirect if source is sending directly to us, 1019 * and if packet was not source routed (or has any options). 1020 * Also, don't send redirect if forwarding using a default route 1021 * or a route modified by a redirect. 1022 */ 1023 dest.s_addr = 0; 1024 if (!srcrt && V_ipsendredirects && 1025 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1026 struct nhop_object *nh; 1027 1028 nh = ro.ro_nh; 1029 1030 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1031 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1032 u_long src = ntohl(ip->ip_src.s_addr); 1033 1034 if (nh_ia != NULL && 1035 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1036 /* Router requirements says to only send host redirects */ 1037 type = ICMP_REDIRECT; 1038 code = ICMP_REDIRECT_HOST; 1039 if (nh->nh_flags & NHF_GATEWAY) { 1040 if (nh->gw_sa.sa_family == AF_INET) 1041 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1042 else /* Do not redirect in case gw is AF_INET6 */ 1043 type = 0; 1044 } else 1045 dest.s_addr = ip->ip_dst.s_addr; 1046 } 1047 } 1048 } 1049 1050 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1051 1052 if (error == EMSGSIZE && ro.ro_nh) 1053 mtu = ro.ro_nh->nh_mtu; 1054 RO_NHFREE(&ro); 1055 1056 if (error) 1057 IPSTAT_INC(ips_cantforward); 1058 else { 1059 IPSTAT_INC(ips_forward); 1060 if (type) 1061 IPSTAT_INC(ips_redirectsent); 1062 else { 1063 if (mcopy) 1064 m_freem(mcopy); 1065 return; 1066 } 1067 } 1068 if (mcopy == NULL) 1069 return; 1070 1071 switch (error) { 1072 case 0: /* forwarded, but need redirect */ 1073 /* type, code set above */ 1074 break; 1075 1076 case ENETUNREACH: 1077 case EHOSTUNREACH: 1078 case ENETDOWN: 1079 case EHOSTDOWN: 1080 default: 1081 type = ICMP_UNREACH; 1082 code = ICMP_UNREACH_HOST; 1083 break; 1084 1085 case EMSGSIZE: 1086 type = ICMP_UNREACH; 1087 code = ICMP_UNREACH_NEEDFRAG; 1088 /* 1089 * If the MTU was set before make sure we are below the 1090 * interface MTU. 1091 * If the MTU wasn't set before use the interface mtu or 1092 * fall back to the next smaller mtu step compared to the 1093 * current packet size. 1094 */ 1095 if (mtu != 0) { 1096 if (ia != NULL) 1097 mtu = min(mtu, ia->ia_ifp->if_mtu); 1098 } else { 1099 if (ia != NULL) 1100 mtu = ia->ia_ifp->if_mtu; 1101 else 1102 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1103 } 1104 IPSTAT_INC(ips_cantfrag); 1105 break; 1106 1107 case ENOBUFS: 1108 case EACCES: /* ipfw denied packet */ 1109 m_freem(mcopy); 1110 return; 1111 } 1112 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1113 } 1114 1115 #define CHECK_SO_CT(sp, ct) \ 1116 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1117 1118 void 1119 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1120 struct mbuf *m) 1121 { 1122 bool stamped; 1123 1124 stamped = false; 1125 if ((inp->inp_socket->so_options & SO_BINTIME) || 1126 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1127 struct bintime boottimebin, bt; 1128 struct timespec ts1; 1129 1130 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1131 M_TSTMP)) { 1132 mbuf_tstmp2timespec(m, &ts1); 1133 timespec2bintime(&ts1, &bt); 1134 getboottimebin(&boottimebin); 1135 bintime_add(&bt, &boottimebin); 1136 } else { 1137 bintime(&bt); 1138 } 1139 *mp = sbcreatecontrol(&bt, sizeof(bt), SCM_BINTIME, 1140 SOL_SOCKET, M_NOWAIT); 1141 if (*mp != NULL) { 1142 mp = &(*mp)->m_next; 1143 stamped = true; 1144 } 1145 } 1146 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1147 struct bintime boottimebin, bt1; 1148 struct timespec ts1; 1149 struct timeval tv; 1150 1151 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1152 M_TSTMP)) { 1153 mbuf_tstmp2timespec(m, &ts1); 1154 timespec2bintime(&ts1, &bt1); 1155 getboottimebin(&boottimebin); 1156 bintime_add(&bt1, &boottimebin); 1157 bintime2timeval(&bt1, &tv); 1158 } else { 1159 microtime(&tv); 1160 } 1161 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, 1162 SOL_SOCKET, M_NOWAIT); 1163 if (*mp != NULL) { 1164 mp = &(*mp)->m_next; 1165 stamped = true; 1166 } 1167 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1168 struct bintime boottimebin; 1169 struct timespec ts, ts1; 1170 1171 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1172 M_TSTMP)) { 1173 mbuf_tstmp2timespec(m, &ts); 1174 getboottimebin(&boottimebin); 1175 bintime2timespec(&boottimebin, &ts1); 1176 timespecadd(&ts, &ts1, &ts); 1177 } else { 1178 nanotime(&ts); 1179 } 1180 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_REALTIME, 1181 SOL_SOCKET, M_NOWAIT); 1182 if (*mp != NULL) { 1183 mp = &(*mp)->m_next; 1184 stamped = true; 1185 } 1186 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1187 struct timespec ts; 1188 1189 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1190 M_TSTMP)) 1191 mbuf_tstmp2timespec(m, &ts); 1192 else 1193 nanouptime(&ts); 1194 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_MONOTONIC, 1195 SOL_SOCKET, M_NOWAIT); 1196 if (*mp != NULL) { 1197 mp = &(*mp)->m_next; 1198 stamped = true; 1199 } 1200 } 1201 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1202 M_TSTMP)) { 1203 struct sock_timestamp_info sti; 1204 1205 bzero(&sti, sizeof(sti)); 1206 sti.st_info_flags = ST_INFO_HW; 1207 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1208 sti.st_info_flags |= ST_INFO_HW_HPREC; 1209 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1210 SOL_SOCKET, M_NOWAIT); 1211 if (*mp != NULL) 1212 mp = &(*mp)->m_next; 1213 } 1214 if (inp->inp_flags & INP_RECVDSTADDR) { 1215 *mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr), 1216 IP_RECVDSTADDR, IPPROTO_IP, M_NOWAIT); 1217 if (*mp) 1218 mp = &(*mp)->m_next; 1219 } 1220 if (inp->inp_flags & INP_RECVTTL) { 1221 *mp = sbcreatecontrol(&ip->ip_ttl, sizeof(u_char), IP_RECVTTL, 1222 IPPROTO_IP, M_NOWAIT); 1223 if (*mp) 1224 mp = &(*mp)->m_next; 1225 } 1226 #ifdef notyet 1227 /* XXX 1228 * Moving these out of udp_input() made them even more broken 1229 * than they already were. 1230 */ 1231 /* options were tossed already */ 1232 if (inp->inp_flags & INP_RECVOPTS) { 1233 *mp = sbcreatecontrol(opts_deleted_above, 1234 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, M_NOWAIT); 1235 if (*mp) 1236 mp = &(*mp)->m_next; 1237 } 1238 /* ip_srcroute doesn't do what we want here, need to fix */ 1239 if (inp->inp_flags & INP_RECVRETOPTS) { 1240 *mp = sbcreatecontrol(ip_srcroute(m), sizeof(struct in_addr), 1241 IP_RECVRETOPTS, IPPROTO_IP, M_NOWAIT); 1242 if (*mp) 1243 mp = &(*mp)->m_next; 1244 } 1245 #endif 1246 if (inp->inp_flags & INP_RECVIF) { 1247 struct ifnet *ifp; 1248 struct sdlbuf { 1249 struct sockaddr_dl sdl; 1250 u_char pad[32]; 1251 } sdlbuf; 1252 struct sockaddr_dl *sdp; 1253 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1254 1255 if ((ifp = m->m_pkthdr.rcvif)) { 1256 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1257 /* 1258 * Change our mind and don't try copy. 1259 */ 1260 if (sdp->sdl_family != AF_LINK || 1261 sdp->sdl_len > sizeof(sdlbuf)) { 1262 goto makedummy; 1263 } 1264 bcopy(sdp, sdl2, sdp->sdl_len); 1265 } else { 1266 makedummy: 1267 sdl2->sdl_len = 1268 offsetof(struct sockaddr_dl, sdl_data[0]); 1269 sdl2->sdl_family = AF_LINK; 1270 sdl2->sdl_index = 0; 1271 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1272 } 1273 *mp = sbcreatecontrol(sdl2, sdl2->sdl_len, IP_RECVIF, 1274 IPPROTO_IP, M_NOWAIT); 1275 if (*mp) 1276 mp = &(*mp)->m_next; 1277 } 1278 if (inp->inp_flags & INP_RECVTOS) { 1279 *mp = sbcreatecontrol(&ip->ip_tos, sizeof(u_char), IP_RECVTOS, 1280 IPPROTO_IP, M_NOWAIT); 1281 if (*mp) 1282 mp = &(*mp)->m_next; 1283 } 1284 1285 if (inp->inp_flags2 & INP_RECVFLOWID) { 1286 uint32_t flowid, flow_type; 1287 1288 flowid = m->m_pkthdr.flowid; 1289 flow_type = M_HASHTYPE_GET(m); 1290 1291 /* 1292 * XXX should handle the failure of one or the 1293 * other - don't populate both? 1294 */ 1295 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IP_FLOWID, 1296 IPPROTO_IP, M_NOWAIT); 1297 if (*mp) 1298 mp = &(*mp)->m_next; 1299 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1300 IP_FLOWTYPE, IPPROTO_IP, M_NOWAIT); 1301 if (*mp) 1302 mp = &(*mp)->m_next; 1303 } 1304 1305 #ifdef RSS 1306 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1307 uint32_t flowid, flow_type; 1308 uint32_t rss_bucketid; 1309 1310 flowid = m->m_pkthdr.flowid; 1311 flow_type = M_HASHTYPE_GET(m); 1312 1313 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1314 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1315 IP_RSSBUCKETID, IPPROTO_IP, M_NOWAIT); 1316 if (*mp) 1317 mp = &(*mp)->m_next; 1318 } 1319 } 1320 #endif 1321 } 1322 1323 /* 1324 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1325 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1326 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1327 * compiled. 1328 */ 1329 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1330 VNET_DEFINE(struct socket *, ip_rsvpd); 1331 1332 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1333 1334 int 1335 ip_rsvp_init(struct socket *so) 1336 { 1337 1338 if (V_ip_rsvpd != NULL) 1339 return EADDRINUSE; 1340 1341 V_ip_rsvpd = so; 1342 /* 1343 * This may seem silly, but we need to be sure we don't over-increment 1344 * the RSVP counter, in case something slips up. 1345 */ 1346 if (!V_ip_rsvp_on) { 1347 V_ip_rsvp_on = 1; 1348 V_rsvp_on++; 1349 } 1350 1351 return 0; 1352 } 1353 1354 int 1355 ip_rsvp_done(void) 1356 { 1357 1358 V_ip_rsvpd = NULL; 1359 /* 1360 * This may seem silly, but we need to be sure we don't over-decrement 1361 * the RSVP counter, in case something slips up. 1362 */ 1363 if (V_ip_rsvp_on) { 1364 V_ip_rsvp_on = 0; 1365 V_rsvp_on--; 1366 } 1367 return 0; 1368 } 1369 1370 int 1371 rsvp_input(struct mbuf **mp, int *offp, int proto) 1372 { 1373 struct mbuf *m; 1374 1375 m = *mp; 1376 *mp = NULL; 1377 1378 if (rsvp_input_p) { /* call the real one if loaded */ 1379 *mp = m; 1380 rsvp_input_p(mp, offp, proto); 1381 return (IPPROTO_DONE); 1382 } 1383 1384 /* Can still get packets with rsvp_on = 0 if there is a local member 1385 * of the group to which the RSVP packet is addressed. But in this 1386 * case we want to throw the packet away. 1387 */ 1388 1389 if (!V_rsvp_on) { 1390 m_freem(m); 1391 return (IPPROTO_DONE); 1392 } 1393 1394 if (V_ip_rsvpd != NULL) { 1395 *mp = m; 1396 rip_input(mp, offp, proto); 1397 return (IPPROTO_DONE); 1398 } 1399 /* Drop the packet */ 1400 m_freem(m); 1401 return (IPPROTO_DONE); 1402 } 1403