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 "opt_bootp.h" 33 #include "opt_inet.h" 34 #include "opt_ipstealth.h" 35 #include "opt_ipsec.h" 36 #include "opt_route.h" 37 #include "opt_rss.h" 38 #include "opt_sctp.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/hhook.h> 43 #include <sys/mbuf.h> 44 #include <sys/malloc.h> 45 #include <sys/domain.h> 46 #include <sys/protosw.h> 47 #include <sys/socket.h> 48 #include <sys/time.h> 49 #include <sys/kernel.h> 50 #include <sys/lock.h> 51 #include <sys/rmlock.h> 52 #include <sys/rwlock.h> 53 #include <sys/sdt.h> 54 #include <sys/syslog.h> 55 #include <sys/sysctl.h> 56 57 #include <net/if.h> 58 #include <net/if_types.h> 59 #include <net/if_var.h> 60 #include <net/if_dl.h> 61 #include <net/if_private.h> 62 #include <net/pfil.h> 63 #include <net/route.h> 64 #include <net/route/nhop.h> 65 #include <net/netisr.h> 66 #include <net/rss_config.h> 67 #include <net/vnet.h> 68 69 #include <netinet/in.h> 70 #include <netinet/in_kdtrace.h> 71 #include <netinet/in_systm.h> 72 #include <netinet/in_var.h> 73 #include <netinet/ip.h> 74 #include <netinet/in_fib.h> 75 #include <netinet/in_pcb.h> 76 #include <netinet/ip_var.h> 77 #include <netinet/ip_encap.h> 78 #include <netinet/ip_fw.h> 79 #include <netinet/ip_icmp.h> 80 #include <netinet/igmp_var.h> 81 #include <netinet/ip_options.h> 82 #include <machine/in_cksum.h> 83 #include <netinet/ip_carp.h> 84 #include <netinet/in_rss.h> 85 #ifdef SCTP 86 #include <netinet/sctp_var.h> 87 #endif 88 89 #include <netipsec/ipsec_support.h> 90 91 #include <sys/socketvar.h> 92 93 #include <security/mac/mac_framework.h> 94 95 #ifdef CTASSERT 96 CTASSERT(sizeof(struct ip) == 20); 97 #endif 98 99 /* IP reassembly functions are defined in ip_reass.c. */ 100 extern void ipreass_init(void); 101 extern void ipreass_vnet_init(void); 102 #ifdef VIMAGE 103 extern void ipreass_destroy(void); 104 #endif 105 106 VNET_DEFINE(int, rsvp_on); 107 108 VNET_DEFINE(int, ipforwarding); 109 SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_VNET | CTLFLAG_RW, 110 &VNET_NAME(ipforwarding), 0, 111 "Enable IP forwarding between interfaces"); 112 113 /* 114 * Respond with an ICMP host redirect when we forward a packet out of 115 * the same interface on which it was received. See RFC 792. 116 */ 117 VNET_DEFINE(int, ipsendredirects) = 1; 118 SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_VNET | CTLFLAG_RW, 119 &VNET_NAME(ipsendredirects), 0, 120 "Enable sending IP redirects"); 121 122 VNET_DEFINE_STATIC(bool, ip_strong_es) = false; 123 #define V_ip_strong_es VNET(ip_strong_es) 124 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, rfc1122_strong_es, 125 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_strong_es), false, 126 "Packet's IP destination address must match address on arrival interface"); 127 128 VNET_DEFINE_STATIC(bool, ip_sav) = true; 129 #define V_ip_sav VNET(ip_sav) 130 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, source_address_validation, 131 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_sav), true, 132 "Drop incoming packets with source address that is a local address"); 133 134 /* Packet filter hooks */ 135 VNET_DEFINE(pfil_head_t, inet_pfil_head); 136 VNET_DEFINE(pfil_head_t, inet_local_pfil_head); 137 138 static struct netisr_handler ip_nh = { 139 .nh_name = "ip", 140 .nh_handler = ip_input, 141 .nh_proto = NETISR_IP, 142 #ifdef RSS 143 .nh_m2cpuid = rss_soft_m2cpuid_v4, 144 .nh_policy = NETISR_POLICY_CPU, 145 .nh_dispatch = NETISR_DISPATCH_HYBRID, 146 #else 147 .nh_policy = NETISR_POLICY_FLOW, 148 #endif 149 }; 150 151 #ifdef RSS 152 /* 153 * Directly dispatched frames are currently assumed 154 * to have a flowid already calculated. 155 * 156 * It should likely have something that assert it 157 * actually has valid flow details. 158 */ 159 static struct netisr_handler ip_direct_nh = { 160 .nh_name = "ip_direct", 161 .nh_handler = ip_direct_input, 162 .nh_proto = NETISR_IP_DIRECT, 163 .nh_m2cpuid = rss_soft_m2cpuid_v4, 164 .nh_policy = NETISR_POLICY_CPU, 165 .nh_dispatch = NETISR_DISPATCH_HYBRID, 166 }; 167 #endif 168 169 ipproto_input_t *ip_protox[IPPROTO_MAX] = { 170 [0 ... IPPROTO_MAX - 1] = rip_input }; 171 ipproto_ctlinput_t *ip_ctlprotox[IPPROTO_MAX] = { 172 [0 ... IPPROTO_MAX - 1] = rip_ctlinput }; 173 174 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */ 175 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */ 176 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */ 177 178 /* Make sure it is safe to use hashinit(9) on CK_LIST. */ 179 CTASSERT(sizeof(struct in_ifaddrhashhead) == sizeof(LIST_HEAD(, in_addr))); 180 181 #ifdef IPCTL_DEFMTU 182 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW, 183 &ip_mtu, 0, "Default MTU"); 184 #endif 185 186 #ifdef IPSTEALTH 187 VNET_DEFINE(int, ipstealth); 188 SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_VNET | CTLFLAG_RW, 189 &VNET_NAME(ipstealth), 0, 190 "IP stealth mode, no TTL decrementation on forwarding"); 191 #endif 192 193 /* 194 * IP statistics are stored in the "array" of counter(9)s. 195 */ 196 VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat); 197 VNET_PCPUSTAT_SYSINIT(ipstat); 198 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat, 199 "IP statistics (struct ipstat, netinet/ip_var.h)"); 200 201 #ifdef VIMAGE 202 VNET_PCPUSTAT_SYSUNINIT(ipstat); 203 #endif /* VIMAGE */ 204 205 /* 206 * Kernel module interface for updating ipstat. The argument is an index 207 * into ipstat treated as an array. 208 */ 209 void 210 kmod_ipstat_inc(int statnum) 211 { 212 213 counter_u64_add(VNET(ipstat)[statnum], 1); 214 } 215 216 void 217 kmod_ipstat_dec(int statnum) 218 { 219 220 counter_u64_add(VNET(ipstat)[statnum], -1); 221 } 222 223 static int 224 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 225 { 226 int error, qlimit; 227 228 netisr_getqlimit(&ip_nh, &qlimit); 229 error = sysctl_handle_int(oidp, &qlimit, 0, req); 230 if (error || !req->newptr) 231 return (error); 232 if (qlimit < 1) 233 return (EINVAL); 234 return (netisr_setqlimit(&ip_nh, qlimit)); 235 } 236 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, 237 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 0, 238 sysctl_netinet_intr_queue_maxlen, "I", 239 "Maximum size of the IP input queue"); 240 241 static int 242 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS) 243 { 244 u_int64_t qdrops_long; 245 int error, qdrops; 246 247 netisr_getqdrops(&ip_nh, &qdrops_long); 248 qdrops = qdrops_long; 249 error = sysctl_handle_int(oidp, &qdrops, 0, req); 250 if (error || !req->newptr) 251 return (error); 252 if (qdrops != 0) 253 return (EINVAL); 254 netisr_clearqdrops(&ip_nh); 255 return (0); 256 } 257 258 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, 259 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 260 0, 0, sysctl_netinet_intr_queue_drops, "I", 261 "Number of packets dropped from the IP input queue"); 262 263 #ifdef RSS 264 static int 265 sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 266 { 267 int error, qlimit; 268 269 netisr_getqlimit(&ip_direct_nh, &qlimit); 270 error = sysctl_handle_int(oidp, &qlimit, 0, req); 271 if (error || !req->newptr) 272 return (error); 273 if (qlimit < 1) 274 return (EINVAL); 275 return (netisr_setqlimit(&ip_direct_nh, qlimit)); 276 } 277 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQMAXLEN, intr_direct_queue_maxlen, 278 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 279 0, 0, sysctl_netinet_intr_direct_queue_maxlen, 280 "I", "Maximum size of the IP direct input queue"); 281 282 static int 283 sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS) 284 { 285 u_int64_t qdrops_long; 286 int error, qdrops; 287 288 netisr_getqdrops(&ip_direct_nh, &qdrops_long); 289 qdrops = qdrops_long; 290 error = sysctl_handle_int(oidp, &qdrops, 0, req); 291 if (error || !req->newptr) 292 return (error); 293 if (qdrops != 0) 294 return (EINVAL); 295 netisr_clearqdrops(&ip_direct_nh); 296 return (0); 297 } 298 299 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQDROPS, intr_direct_queue_drops, 300 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 301 sysctl_netinet_intr_direct_queue_drops, "I", 302 "Number of packets dropped from the IP direct input queue"); 303 #endif /* RSS */ 304 305 /* 306 * IP initialization: fill in IP protocol switch table. 307 * All protocols not implemented in kernel go to raw IP protocol handler. 308 */ 309 static void 310 ip_vnet_init(void *arg __unused) 311 { 312 struct pfil_head_args args; 313 314 CK_STAILQ_INIT(&V_in_ifaddrhead); 315 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask); 316 317 /* Initialize IP reassembly queue. */ 318 ipreass_vnet_init(); 319 320 /* Initialize packet filter hooks. */ 321 args.pa_version = PFIL_VERSION; 322 args.pa_flags = PFIL_IN | PFIL_OUT; 323 args.pa_type = PFIL_TYPE_IP4; 324 args.pa_headname = PFIL_INET_NAME; 325 V_inet_pfil_head = pfil_head_register(&args); 326 327 args.pa_flags = PFIL_OUT; 328 args.pa_headname = PFIL_INET_LOCAL_NAME; 329 V_inet_local_pfil_head = pfil_head_register(&args); 330 331 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET, 332 &V_ipsec_hhh_in[HHOOK_IPSEC_INET], 333 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 334 printf("%s: WARNING: unable to register input helper hook\n", 335 __func__); 336 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET, 337 &V_ipsec_hhh_out[HHOOK_IPSEC_INET], 338 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 339 printf("%s: WARNING: unable to register output helper hook\n", 340 __func__); 341 342 #ifdef VIMAGE 343 netisr_register_vnet(&ip_nh); 344 #ifdef RSS 345 netisr_register_vnet(&ip_direct_nh); 346 #endif 347 #endif 348 } 349 VNET_SYSINIT(ip_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 350 ip_vnet_init, NULL); 351 352 static void 353 ip_init(const void *unused __unused) 354 { 355 356 ipreass_init(); 357 358 /* 359 * Register statically compiled protocols, that are unlikely to 360 * ever become dynamic. 361 */ 362 IPPROTO_REGISTER(IPPROTO_ICMP, icmp_input, NULL); 363 IPPROTO_REGISTER(IPPROTO_IGMP, igmp_input, NULL); 364 IPPROTO_REGISTER(IPPROTO_RSVP, rsvp_input, NULL); 365 IPPROTO_REGISTER(IPPROTO_IPV4, encap4_input, NULL); 366 IPPROTO_REGISTER(IPPROTO_MOBILE, encap4_input, NULL); 367 IPPROTO_REGISTER(IPPROTO_ETHERIP, encap4_input, NULL); 368 IPPROTO_REGISTER(IPPROTO_GRE, encap4_input, NULL); 369 IPPROTO_REGISTER(IPPROTO_IPV6, encap4_input, NULL); 370 IPPROTO_REGISTER(IPPROTO_PIM, encap4_input, NULL); 371 #ifdef SCTP /* XXX: has a loadable & static version */ 372 IPPROTO_REGISTER(IPPROTO_SCTP, sctp_input, sctp_ctlinput); 373 #endif 374 375 netisr_register(&ip_nh); 376 #ifdef RSS 377 netisr_register(&ip_direct_nh); 378 #endif 379 } 380 SYSINIT(ip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_init, NULL); 381 382 #ifdef VIMAGE 383 static void 384 ip_destroy(void *unused __unused) 385 { 386 int error; 387 388 #ifdef RSS 389 netisr_unregister_vnet(&ip_direct_nh); 390 #endif 391 netisr_unregister_vnet(&ip_nh); 392 393 pfil_head_unregister(V_inet_pfil_head); 394 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]); 395 if (error != 0) { 396 printf("%s: WARNING: unable to deregister input helper hook " 397 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: " 398 "error %d returned\n", __func__, error); 399 } 400 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]); 401 if (error != 0) { 402 printf("%s: WARNING: unable to deregister output helper hook " 403 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: " 404 "error %d returned\n", __func__, error); 405 } 406 407 /* Remove the IPv4 addresses from all interfaces. */ 408 in_ifscrub_all(); 409 410 /* Make sure the IPv4 routes are gone as well. */ 411 rib_flush_routes_family(AF_INET); 412 413 /* Destroy IP reassembly queue. */ 414 ipreass_destroy(); 415 416 /* Cleanup in_ifaddr hash table; should be empty. */ 417 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask); 418 } 419 420 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL); 421 #endif 422 423 #ifdef RSS 424 /* 425 * IP direct input routine. 426 * 427 * This is called when reinjecting completed fragments where 428 * all of the previous checking and book-keeping has been done. 429 */ 430 void 431 ip_direct_input(struct mbuf *m) 432 { 433 struct ip *ip; 434 int hlen; 435 436 ip = mtod(m, struct ip *); 437 hlen = ip->ip_hl << 2; 438 439 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 440 if (IPSEC_ENABLED(ipv4)) { 441 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 442 return; 443 } 444 #endif /* IPSEC */ 445 IPSTAT_INC(ips_delivered); 446 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 447 } 448 #endif 449 450 /* 451 * Ip input routine. Checksum and byte swap header. If fragmented 452 * try to reassemble. Process options. Pass to next level. 453 */ 454 void 455 ip_input(struct mbuf *m) 456 { 457 struct ip *ip = NULL; 458 struct in_ifaddr *ia = NULL; 459 struct ifaddr *ifa; 460 struct ifnet *ifp; 461 int hlen = 0; 462 uint16_t sum, ip_len; 463 int dchg = 0; /* dest changed after fw */ 464 struct in_addr odst; /* original dst address */ 465 bool strong_es; 466 467 M_ASSERTPKTHDR(m); 468 NET_EPOCH_ASSERT(); 469 470 if (m->m_flags & M_FASTFWD_OURS) { 471 m->m_flags &= ~M_FASTFWD_OURS; 472 /* Set up some basics that will be used later. */ 473 ip = mtod(m, struct ip *); 474 hlen = ip->ip_hl << 2; 475 ip_len = ntohs(ip->ip_len); 476 goto ours; 477 } 478 479 IPSTAT_INC(ips_total); 480 481 if (__predict_false(m->m_pkthdr.len < sizeof(struct ip))) 482 goto tooshort; 483 484 if (m->m_len < sizeof(struct ip)) { 485 m = m_pullup(m, sizeof(struct ip)); 486 if (__predict_false(m == NULL)) { 487 IPSTAT_INC(ips_toosmall); 488 return; 489 } 490 } 491 ip = mtod(m, struct ip *); 492 493 if (__predict_false(ip->ip_v != IPVERSION)) { 494 IPSTAT_INC(ips_badvers); 495 goto bad; 496 } 497 498 hlen = ip->ip_hl << 2; 499 if (__predict_false(hlen < sizeof(struct ip))) { /* minimum header length */ 500 IPSTAT_INC(ips_badhlen); 501 goto bad; 502 } 503 if (hlen > m->m_len) { 504 m = m_pullup(m, hlen); 505 if (__predict_false(m == NULL)) { 506 IPSTAT_INC(ips_badhlen); 507 return; 508 } 509 ip = mtod(m, struct ip *); 510 } 511 512 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 513 514 /* IN_LOOPBACK must not appear on the wire - RFC1122 */ 515 ifp = m->m_pkthdr.rcvif; 516 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 517 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 518 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 519 IPSTAT_INC(ips_badaddr); 520 goto bad; 521 } 522 } 523 524 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 525 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 526 } else { 527 if (hlen == sizeof(struct ip)) { 528 sum = in_cksum_hdr(ip); 529 } else { 530 sum = in_cksum(m, hlen); 531 } 532 } 533 if (__predict_false(sum)) { 534 IPSTAT_INC(ips_badsum); 535 goto bad; 536 } 537 538 ip_len = ntohs(ip->ip_len); 539 if (__predict_false(ip_len < hlen)) { 540 IPSTAT_INC(ips_badlen); 541 goto bad; 542 } 543 544 /* 545 * Check that the amount of data in the buffers 546 * is as at least much as the IP header would have us expect. 547 * Trim mbufs if longer than we expect. 548 * Drop packet if shorter than we expect. 549 */ 550 if (__predict_false(m->m_pkthdr.len < ip_len)) { 551 tooshort: 552 IPSTAT_INC(ips_tooshort); 553 goto bad; 554 } 555 if (m->m_pkthdr.len > ip_len) { 556 if (m->m_len == m->m_pkthdr.len) { 557 m->m_len = ip_len; 558 m->m_pkthdr.len = ip_len; 559 } else 560 m_adj(m, ip_len - m->m_pkthdr.len); 561 } 562 563 /* 564 * Try to forward the packet, but if we fail continue. 565 * ip_tryforward() may generate redirects these days. 566 * XXX the logic below falling through to normal processing 567 * if redirects are required should be revisited as well. 568 * ip_tryforward() does inbound and outbound packet firewall 569 * processing. If firewall has decided that destination becomes 570 * our local address, it sets M_FASTFWD_OURS flag. In this 571 * case skip another inbound firewall processing and update 572 * ip pointer. 573 */ 574 if (V_ipforwarding != 0 575 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 576 && (!IPSEC_ENABLED(ipv4) || 577 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 578 #endif 579 ) { 580 /* 581 * ip_dooptions() was run so we can ignore the source route (or 582 * any IP options case) case for redirects in ip_tryforward(). 583 */ 584 if ((m = ip_tryforward(m)) == NULL) 585 return; 586 if (m->m_flags & M_FASTFWD_OURS) { 587 m->m_flags &= ~M_FASTFWD_OURS; 588 ip = mtod(m, struct ip *); 589 goto ours; 590 } 591 } 592 593 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 594 /* 595 * Bypass packet filtering for packets previously handled by IPsec. 596 */ 597 if (IPSEC_ENABLED(ipv4) && 598 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 599 goto passin; 600 #endif 601 602 /* 603 * Run through list of hooks for input packets. 604 * 605 * NB: Beware of the destination address changing (e.g. 606 * by NAT rewriting). When this happens, tell 607 * ip_forward to do the right thing. 608 */ 609 610 /* Jump over all PFIL processing if hooks are not active. */ 611 if (!PFIL_HOOKED_IN(V_inet_pfil_head)) 612 goto passin; 613 614 odst = ip->ip_dst; 615 if (pfil_mbuf_in(V_inet_pfil_head, &m, ifp, NULL) != 616 PFIL_PASS) 617 return; 618 619 ip = mtod(m, struct ip *); 620 dchg = (odst.s_addr != ip->ip_dst.s_addr); 621 622 if (m->m_flags & M_FASTFWD_OURS) { 623 m->m_flags &= ~M_FASTFWD_OURS; 624 goto ours; 625 } 626 if (m->m_flags & M_IP_NEXTHOP) { 627 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 628 /* 629 * Directly ship the packet on. This allows 630 * forwarding packets originally destined to us 631 * to some other directly connected host. 632 */ 633 ip_forward(m, 1); 634 return; 635 } 636 } 637 passin: 638 /* 639 * The unspecified address can appear only as a src address - RFC1122. 640 * 641 * The check is deferred to here to give firewalls a chance to block 642 * (and log) such packets. ip_tryforward() will not process such 643 * packets. 644 */ 645 if (__predict_false(ntohl(ip->ip_dst.s_addr) == INADDR_ANY)) { 646 IPSTAT_INC(ips_badaddr); 647 goto bad; 648 } 649 650 /* 651 * Process options and, if not destined for us, 652 * ship it on. ip_dooptions returns 1 when an 653 * error was detected (causing an icmp message 654 * to be sent and the original packet to be freed). 655 */ 656 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 657 return; 658 659 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 660 * matter if it is destined to another node, or whether it is 661 * a multicast one, RSVP wants it! and prevents it from being forwarded 662 * anywhere else. Also checks if the rsvp daemon is running before 663 * grabbing the packet. 664 */ 665 if (ip->ip_p == IPPROTO_RSVP && V_rsvp_on) 666 goto ours; 667 668 /* 669 * Check our list of addresses, to see if the packet is for us. 670 * If we don't have any addresses, assume any unicast packet 671 * we receive might be for us (and let the upper layers deal 672 * with it). 673 */ 674 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) && 675 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 676 goto ours; 677 678 /* 679 * Enable a consistency check between the destination address 680 * and the arrival interface for a unicast packet (the RFC 1122 681 * strong ES model) with a list of additional predicates: 682 * - if IP forwarding is disabled 683 * - the packet is not locally generated 684 * - the packet is not subject to 'ipfw fwd' 685 * - Interface is not running CARP. If the packet got here, we already 686 * checked it with carp_iamatch() and carp_forus(). 687 */ 688 strong_es = V_ip_strong_es && (V_ipforwarding == 0) && 689 ((ifp->if_flags & IFF_LOOPBACK) == 0) && 690 ifp->if_carp == NULL && (dchg == 0); 691 692 /* 693 * Check for exact addresses in the hash bucket. 694 */ 695 CK_LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 696 if (IA_SIN(ia)->sin_addr.s_addr != ip->ip_dst.s_addr) 697 continue; 698 699 /* 700 * net.inet.ip.rfc1122_strong_es: the address matches, verify 701 * that the packet arrived via the correct interface. 702 */ 703 if (__predict_false(strong_es && ia->ia_ifp != ifp)) { 704 IPSTAT_INC(ips_badaddr); 705 goto bad; 706 } 707 708 /* 709 * net.inet.ip.source_address_validation: drop incoming 710 * packets that pretend to be ours. 711 */ 712 if (V_ip_sav && !(ifp->if_flags & IFF_LOOPBACK) && 713 __predict_false(in_localip_fib(ip->ip_src, ifp->if_fib))) { 714 IPSTAT_INC(ips_badaddr); 715 goto bad; 716 } 717 718 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 719 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 720 goto ours; 721 } 722 723 /* 724 * Check for broadcast addresses. 725 * 726 * Only accept broadcast packets that arrive via the matching 727 * interface. Reception of forwarded directed broadcasts would 728 * be handled via ip_forward() and ether_output() with the loopback 729 * into the stack for SIMPLEX interfaces handled by ether_output(). 730 */ 731 if (ifp->if_flags & IFF_BROADCAST) { 732 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 733 if (ifa->ifa_addr->sa_family != AF_INET) 734 continue; 735 ia = ifatoia(ifa); 736 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 737 ip->ip_dst.s_addr) { 738 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 739 counter_u64_add(ia->ia_ifa.ifa_ibytes, 740 m->m_pkthdr.len); 741 goto ours; 742 } 743 #ifdef BOOTP_COMPAT 744 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 745 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 746 counter_u64_add(ia->ia_ifa.ifa_ibytes, 747 m->m_pkthdr.len); 748 goto ours; 749 } 750 #endif 751 } 752 ia = NULL; 753 } 754 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 755 /* 756 * RFC 3927 2.7: Do not forward multicast packets from 757 * IN_LINKLOCAL. 758 */ 759 if (V_ip_mrouter && !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 760 /* 761 * If we are acting as a multicast router, all 762 * incoming multicast packets are passed to the 763 * kernel-level multicast forwarding function. 764 * The packet is returned (relatively) intact; if 765 * ip_mforward() returns a non-zero value, the packet 766 * must be discarded, else it may be accepted below. 767 */ 768 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 769 IPSTAT_INC(ips_cantforward); 770 m_freem(m); 771 return; 772 } 773 774 /* 775 * The process-level routing daemon needs to receive 776 * all multicast IGMP packets, whether or not this 777 * host belongs to their destination groups. 778 */ 779 if (ip->ip_p == IPPROTO_IGMP) { 780 goto ours; 781 } 782 IPSTAT_INC(ips_forward); 783 } 784 /* 785 * Assume the packet is for us, to avoid prematurely taking 786 * a lock on the in_multi hash. Protocols must perform 787 * their own filtering and update statistics accordingly. 788 */ 789 goto ours; 790 } 791 if (in_broadcast(ip->ip_dst)) 792 goto ours; 793 /* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */ 794 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || 795 IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 796 IPSTAT_INC(ips_cantforward); 797 m_freem(m); 798 return; 799 } 800 801 /* 802 * Not for us; forward if possible and desirable. 803 */ 804 if (V_ipforwarding == 0) { 805 IPSTAT_INC(ips_cantforward); 806 m_freem(m); 807 } else { 808 ip_forward(m, dchg); 809 } 810 return; 811 812 ours: 813 #ifdef IPSTEALTH 814 /* 815 * IPSTEALTH: Process non-routing options only 816 * if the packet is destined for us. 817 */ 818 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 819 return; 820 #endif /* IPSTEALTH */ 821 822 /* 823 * We are going to ship the packet to the local protocol stack. Call the 824 * filter again for this 'output' action, allowing redirect-like rules 825 * to adjust the source address. 826 */ 827 if (PFIL_HOOKED_OUT(V_inet_local_pfil_head)) { 828 if (pfil_mbuf_out(V_inet_local_pfil_head, &m, V_loif, NULL) != 829 PFIL_PASS) 830 return; 831 ip = mtod(m, struct ip *); 832 } 833 834 /* 835 * Attempt reassembly; if it succeeds, proceed. 836 * ip_reass() will return a different mbuf. 837 */ 838 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 839 /* XXXGL: shouldn't we save & set m_flags? */ 840 m = ip_reass(m); 841 if (m == NULL) 842 return; 843 ip = mtod(m, struct ip *); 844 /* Get the header length of the reassembled packet */ 845 hlen = ip->ip_hl << 2; 846 } 847 848 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 849 if (IPSEC_ENABLED(ipv4)) { 850 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 851 return; 852 } 853 #endif /* IPSEC */ 854 855 /* 856 * Switch out to protocol's input routine. 857 */ 858 IPSTAT_INC(ips_delivered); 859 860 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 861 return; 862 bad: 863 m_freem(m); 864 } 865 866 int 867 ipproto_register(uint8_t proto, ipproto_input_t input, ipproto_ctlinput_t ctl) 868 { 869 870 MPASS(proto > 0); 871 872 /* 873 * The protocol slot must not be occupied by another protocol 874 * already. An index pointing to rip_input() is unused. 875 */ 876 if (ip_protox[proto] == rip_input) { 877 ip_protox[proto] = input; 878 ip_ctlprotox[proto] = ctl; 879 return (0); 880 } else 881 return (EEXIST); 882 } 883 884 int 885 ipproto_unregister(uint8_t proto) 886 { 887 888 MPASS(proto > 0); 889 890 if (ip_protox[proto] != rip_input) { 891 ip_protox[proto] = rip_input; 892 ip_ctlprotox[proto] = rip_ctlinput; 893 return (0); 894 } else 895 return (ENOENT); 896 } 897 898 /* 899 * Forward a packet. If some error occurs return the sender 900 * an icmp packet. Note we can't always generate a meaningful 901 * icmp message because icmp doesn't have a large enough repertoire 902 * of codes and types. 903 * 904 * If not forwarding, just drop the packet. This could be confusing 905 * if ipforwarding was zero but some routing protocol was advancing 906 * us as a gateway to somewhere. However, we must let the routing 907 * protocol deal with that. 908 * 909 * The srcrt parameter indicates whether the packet is being forwarded 910 * via a source route. 911 */ 912 void 913 ip_forward(struct mbuf *m, int srcrt) 914 { 915 struct ip *ip = mtod(m, struct ip *); 916 struct in_ifaddr *ia; 917 struct mbuf *mcopy; 918 struct sockaddr_in *sin; 919 struct in_addr dest; 920 struct route ro; 921 uint32_t flowid; 922 int error, type = 0, code = 0, mtu = 0; 923 924 NET_EPOCH_ASSERT(); 925 926 if (m->m_flags & (M_BCAST|M_MCAST) || !in_canforward(ip->ip_dst)) { 927 IPSTAT_INC(ips_cantforward); 928 m_freem(m); 929 return; 930 } 931 if ( 932 #ifdef IPSTEALTH 933 V_ipstealth == 0 && 934 #endif 935 ip->ip_ttl <= IPTTLDEC) { 936 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 937 return; 938 } 939 940 bzero(&ro, sizeof(ro)); 941 sin = (struct sockaddr_in *)&ro.ro_dst; 942 sin->sin_family = AF_INET; 943 sin->sin_len = sizeof(*sin); 944 sin->sin_addr = ip->ip_dst; 945 flowid = m->m_pkthdr.flowid; 946 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 947 if (ro.ro_nh != NULL) { 948 if (ro.ro_nh->nh_flags & (NHF_BLACKHOLE | NHF_BROADCAST)) { 949 IPSTAT_INC(ips_cantforward); 950 m_freem(m); 951 NH_FREE(ro.ro_nh); 952 return; 953 } 954 if (ro.ro_nh->nh_flags & NHF_REJECT) { 955 IPSTAT_INC(ips_cantforward); 956 NH_FREE(ro.ro_nh); 957 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 958 return; 959 } 960 ia = ifatoia(ro.ro_nh->nh_ifa); 961 } else 962 ia = NULL; 963 /* 964 * Save the IP header and at most 8 bytes of the payload, 965 * in case we need to generate an ICMP message to the src. 966 * 967 * XXX this can be optimized a lot by saving the data in a local 968 * buffer on the stack (72 bytes at most), and only allocating the 969 * mbuf if really necessary. The vast majority of the packets 970 * are forwarded without having to send an ICMP back (either 971 * because unnecessary, or because rate limited), so we are 972 * really we are wasting a lot of work here. 973 * 974 * We don't use m_copym() because it might return a reference 975 * to a shared cluster. Both this function and ip_output() 976 * assume exclusive access to the IP header in `m', so any 977 * data in a cluster may change before we reach icmp_error(). 978 */ 979 mcopy = m_gethdr(M_NOWAIT, m->m_type); 980 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 981 /* 982 * It's probably ok if the pkthdr dup fails (because 983 * the deep copy of the tag chain failed), but for now 984 * be conservative and just discard the copy since 985 * code below may some day want the tags. 986 */ 987 m_free(mcopy); 988 mcopy = NULL; 989 } 990 if (mcopy != NULL) { 991 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 992 mcopy->m_pkthdr.len = mcopy->m_len; 993 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 994 } 995 #ifdef IPSTEALTH 996 if (V_ipstealth == 0) 997 #endif 998 ip->ip_ttl -= IPTTLDEC; 999 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1000 if (IPSEC_ENABLED(ipv4)) { 1001 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 1002 /* mbuf consumed by IPsec */ 1003 RO_NHFREE(&ro); 1004 m_freem(mcopy); 1005 if (error != EINPROGRESS) 1006 IPSTAT_INC(ips_cantforward); 1007 return; 1008 } 1009 /* No IPsec processing required */ 1010 } 1011 #endif /* IPSEC */ 1012 /* 1013 * If forwarding packet using same interface that it came in on, 1014 * perhaps should send a redirect to sender to shortcut a hop. 1015 * Only send redirect if source is sending directly to us, 1016 * and if packet was not source routed (or has any options). 1017 * Also, don't send redirect if forwarding using a default route 1018 * or a route modified by a redirect. 1019 */ 1020 dest.s_addr = 0; 1021 if (!srcrt && V_ipsendredirects && 1022 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1023 struct nhop_object *nh; 1024 1025 nh = ro.ro_nh; 1026 1027 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1028 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1029 u_long src = ntohl(ip->ip_src.s_addr); 1030 1031 if (nh_ia != NULL && 1032 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1033 /* Router requirements says to only send host redirects */ 1034 type = ICMP_REDIRECT; 1035 code = ICMP_REDIRECT_HOST; 1036 if (nh->nh_flags & NHF_GATEWAY) { 1037 if (nh->gw_sa.sa_family == AF_INET) 1038 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1039 else /* Do not redirect in case gw is AF_INET6 */ 1040 type = 0; 1041 } else 1042 dest.s_addr = ip->ip_dst.s_addr; 1043 } 1044 } 1045 } 1046 1047 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1048 1049 if (error == EMSGSIZE && ro.ro_nh) 1050 mtu = ro.ro_nh->nh_mtu; 1051 RO_NHFREE(&ro); 1052 1053 if (error) 1054 IPSTAT_INC(ips_cantforward); 1055 else { 1056 IPSTAT_INC(ips_forward); 1057 if (type) 1058 IPSTAT_INC(ips_redirectsent); 1059 else { 1060 if (mcopy) 1061 m_freem(mcopy); 1062 return; 1063 } 1064 } 1065 if (mcopy == NULL) 1066 return; 1067 1068 switch (error) { 1069 case 0: /* forwarded, but need redirect */ 1070 /* type, code set above */ 1071 break; 1072 1073 case ENETUNREACH: 1074 case EHOSTUNREACH: 1075 case ENETDOWN: 1076 case EHOSTDOWN: 1077 default: 1078 type = ICMP_UNREACH; 1079 code = ICMP_UNREACH_HOST; 1080 break; 1081 1082 case EMSGSIZE: 1083 type = ICMP_UNREACH; 1084 code = ICMP_UNREACH_NEEDFRAG; 1085 /* 1086 * If the MTU was set before make sure we are below the 1087 * interface MTU. 1088 * If the MTU wasn't set before use the interface mtu or 1089 * fall back to the next smaller mtu step compared to the 1090 * current packet size. 1091 */ 1092 if (mtu != 0) { 1093 if (ia != NULL) 1094 mtu = min(mtu, ia->ia_ifp->if_mtu); 1095 } else { 1096 if (ia != NULL) 1097 mtu = ia->ia_ifp->if_mtu; 1098 else 1099 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1100 } 1101 IPSTAT_INC(ips_cantfrag); 1102 break; 1103 1104 case ENOBUFS: 1105 case EACCES: /* ipfw denied packet */ 1106 m_freem(mcopy); 1107 return; 1108 } 1109 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1110 } 1111 1112 #define CHECK_SO_CT(sp, ct) \ 1113 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1114 1115 void 1116 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1117 struct mbuf *m) 1118 { 1119 bool stamped; 1120 1121 stamped = false; 1122 if ((inp->inp_socket->so_options & SO_BINTIME) || 1123 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1124 struct bintime boottimebin, bt; 1125 struct timespec ts1; 1126 1127 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1128 M_TSTMP)) { 1129 mbuf_tstmp2timespec(m, &ts1); 1130 timespec2bintime(&ts1, &bt); 1131 getboottimebin(&boottimebin); 1132 bintime_add(&bt, &boottimebin); 1133 } else { 1134 bintime(&bt); 1135 } 1136 *mp = sbcreatecontrol(&bt, sizeof(bt), SCM_BINTIME, 1137 SOL_SOCKET, M_NOWAIT); 1138 if (*mp != NULL) { 1139 mp = &(*mp)->m_next; 1140 stamped = true; 1141 } 1142 } 1143 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1144 struct bintime boottimebin, bt1; 1145 struct timespec ts1; 1146 struct timeval tv; 1147 1148 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1149 M_TSTMP)) { 1150 mbuf_tstmp2timespec(m, &ts1); 1151 timespec2bintime(&ts1, &bt1); 1152 getboottimebin(&boottimebin); 1153 bintime_add(&bt1, &boottimebin); 1154 bintime2timeval(&bt1, &tv); 1155 } else { 1156 microtime(&tv); 1157 } 1158 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, 1159 SOL_SOCKET, M_NOWAIT); 1160 if (*mp != NULL) { 1161 mp = &(*mp)->m_next; 1162 stamped = true; 1163 } 1164 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1165 struct bintime boottimebin; 1166 struct timespec ts, ts1; 1167 1168 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1169 M_TSTMP)) { 1170 mbuf_tstmp2timespec(m, &ts); 1171 getboottimebin(&boottimebin); 1172 bintime2timespec(&boottimebin, &ts1); 1173 timespecadd(&ts, &ts1, &ts); 1174 } else { 1175 nanotime(&ts); 1176 } 1177 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_REALTIME, 1178 SOL_SOCKET, M_NOWAIT); 1179 if (*mp != NULL) { 1180 mp = &(*mp)->m_next; 1181 stamped = true; 1182 } 1183 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1184 struct timespec ts; 1185 1186 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1187 M_TSTMP)) 1188 mbuf_tstmp2timespec(m, &ts); 1189 else 1190 nanouptime(&ts); 1191 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_MONOTONIC, 1192 SOL_SOCKET, M_NOWAIT); 1193 if (*mp != NULL) { 1194 mp = &(*mp)->m_next; 1195 stamped = true; 1196 } 1197 } 1198 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1199 M_TSTMP)) { 1200 struct sock_timestamp_info sti; 1201 1202 bzero(&sti, sizeof(sti)); 1203 sti.st_info_flags = ST_INFO_HW; 1204 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1205 sti.st_info_flags |= ST_INFO_HW_HPREC; 1206 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1207 SOL_SOCKET, M_NOWAIT); 1208 if (*mp != NULL) 1209 mp = &(*mp)->m_next; 1210 } 1211 if (inp->inp_flags & INP_RECVDSTADDR) { 1212 *mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr), 1213 IP_RECVDSTADDR, IPPROTO_IP, M_NOWAIT); 1214 if (*mp) 1215 mp = &(*mp)->m_next; 1216 } 1217 if (inp->inp_flags & INP_RECVTTL) { 1218 *mp = sbcreatecontrol(&ip->ip_ttl, sizeof(u_char), IP_RECVTTL, 1219 IPPROTO_IP, M_NOWAIT); 1220 if (*mp) 1221 mp = &(*mp)->m_next; 1222 } 1223 #ifdef notyet 1224 /* XXX 1225 * Moving these out of udp_input() made them even more broken 1226 * than they already were. 1227 */ 1228 /* options were tossed already */ 1229 if (inp->inp_flags & INP_RECVOPTS) { 1230 *mp = sbcreatecontrol(opts_deleted_above, 1231 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, M_NOWAIT); 1232 if (*mp) 1233 mp = &(*mp)->m_next; 1234 } 1235 /* ip_srcroute doesn't do what we want here, need to fix */ 1236 if (inp->inp_flags & INP_RECVRETOPTS) { 1237 *mp = sbcreatecontrol(ip_srcroute(m), sizeof(struct in_addr), 1238 IP_RECVRETOPTS, IPPROTO_IP, M_NOWAIT); 1239 if (*mp) 1240 mp = &(*mp)->m_next; 1241 } 1242 #endif 1243 if (inp->inp_flags & INP_RECVIF) { 1244 struct ifnet *ifp; 1245 struct sdlbuf { 1246 struct sockaddr_dl sdl; 1247 u_char pad[32]; 1248 } sdlbuf; 1249 struct sockaddr_dl *sdp; 1250 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1251 1252 if ((ifp = m->m_pkthdr.rcvif)) { 1253 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1254 /* 1255 * Change our mind and don't try copy. 1256 */ 1257 if (sdp->sdl_family != AF_LINK || 1258 sdp->sdl_len > sizeof(sdlbuf)) { 1259 goto makedummy; 1260 } 1261 bcopy(sdp, sdl2, sdp->sdl_len); 1262 } else { 1263 makedummy: 1264 sdl2->sdl_len = 1265 offsetof(struct sockaddr_dl, sdl_data[0]); 1266 sdl2->sdl_family = AF_LINK; 1267 sdl2->sdl_index = 0; 1268 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1269 } 1270 *mp = sbcreatecontrol(sdl2, sdl2->sdl_len, IP_RECVIF, 1271 IPPROTO_IP, M_NOWAIT); 1272 if (*mp) 1273 mp = &(*mp)->m_next; 1274 } 1275 if (inp->inp_flags & INP_RECVTOS) { 1276 *mp = sbcreatecontrol(&ip->ip_tos, sizeof(u_char), IP_RECVTOS, 1277 IPPROTO_IP, M_NOWAIT); 1278 if (*mp) 1279 mp = &(*mp)->m_next; 1280 } 1281 1282 if (inp->inp_flags2 & INP_RECVFLOWID) { 1283 uint32_t flowid, flow_type; 1284 1285 flowid = m->m_pkthdr.flowid; 1286 flow_type = M_HASHTYPE_GET(m); 1287 1288 /* 1289 * XXX should handle the failure of one or the 1290 * other - don't populate both? 1291 */ 1292 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IP_FLOWID, 1293 IPPROTO_IP, M_NOWAIT); 1294 if (*mp) 1295 mp = &(*mp)->m_next; 1296 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1297 IP_FLOWTYPE, IPPROTO_IP, M_NOWAIT); 1298 if (*mp) 1299 mp = &(*mp)->m_next; 1300 } 1301 1302 #ifdef RSS 1303 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1304 uint32_t flowid, flow_type; 1305 uint32_t rss_bucketid; 1306 1307 flowid = m->m_pkthdr.flowid; 1308 flow_type = M_HASHTYPE_GET(m); 1309 1310 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1311 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1312 IP_RSSBUCKETID, IPPROTO_IP, M_NOWAIT); 1313 if (*mp) 1314 mp = &(*mp)->m_next; 1315 } 1316 } 1317 #endif 1318 } 1319 1320 /* 1321 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1322 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1323 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1324 * compiled. 1325 */ 1326 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1327 VNET_DEFINE(struct socket *, ip_rsvpd); 1328 1329 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1330 1331 int 1332 ip_rsvp_init(struct socket *so) 1333 { 1334 1335 if (V_ip_rsvpd != NULL) 1336 return EADDRINUSE; 1337 1338 V_ip_rsvpd = so; 1339 /* 1340 * This may seem silly, but we need to be sure we don't over-increment 1341 * the RSVP counter, in case something slips up. 1342 */ 1343 if (!V_ip_rsvp_on) { 1344 V_ip_rsvp_on = 1; 1345 V_rsvp_on++; 1346 } 1347 1348 return 0; 1349 } 1350 1351 int 1352 ip_rsvp_done(void) 1353 { 1354 1355 V_ip_rsvpd = NULL; 1356 /* 1357 * This may seem silly, but we need to be sure we don't over-decrement 1358 * the RSVP counter, in case something slips up. 1359 */ 1360 if (V_ip_rsvp_on) { 1361 V_ip_rsvp_on = 0; 1362 V_rsvp_on--; 1363 } 1364 return 0; 1365 } 1366 1367 int 1368 rsvp_input(struct mbuf **mp, int *offp, int proto) 1369 { 1370 struct mbuf *m; 1371 1372 m = *mp; 1373 *mp = NULL; 1374 1375 if (rsvp_input_p) { /* call the real one if loaded */ 1376 *mp = m; 1377 rsvp_input_p(mp, offp, proto); 1378 return (IPPROTO_DONE); 1379 } 1380 1381 /* Can still get packets with rsvp_on = 0 if there is a local member 1382 * of the group to which the RSVP packet is addressed. But in this 1383 * case we want to throw the packet away. 1384 */ 1385 1386 if (!V_rsvp_on) { 1387 m_freem(m); 1388 return (IPPROTO_DONE); 1389 } 1390 1391 if (V_ip_rsvpd != NULL) { 1392 *mp = m; 1393 rip_input(mp, offp, proto); 1394 return (IPPROTO_DONE); 1395 } 1396 /* Drop the packet */ 1397 m_freem(m); 1398 return (IPPROTO_DONE); 1399 } 1400