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 if (m == NULL) /* consumed by filter */ 625 return; 626 627 ip = mtod(m, struct ip *); 628 dchg = (odst.s_addr != ip->ip_dst.s_addr); 629 630 if (m->m_flags & M_FASTFWD_OURS) { 631 m->m_flags &= ~M_FASTFWD_OURS; 632 goto ours; 633 } 634 if (m->m_flags & M_IP_NEXTHOP) { 635 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 636 /* 637 * Directly ship the packet on. This allows 638 * forwarding packets originally destined to us 639 * to some other directly connected host. 640 */ 641 ip_forward(m, 1); 642 return; 643 } 644 } 645 passin: 646 647 /* 648 * Process options and, if not destined for us, 649 * ship it on. ip_dooptions returns 1 when an 650 * error was detected (causing an icmp message 651 * to be sent and the original packet to be freed). 652 */ 653 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 654 return; 655 656 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 657 * matter if it is destined to another node, or whether it is 658 * a multicast one, RSVP wants it! and prevents it from being forwarded 659 * anywhere else. Also checks if the rsvp daemon is running before 660 * grabbing the packet. 661 */ 662 if (ip->ip_p == IPPROTO_RSVP && V_rsvp_on) 663 goto ours; 664 665 /* 666 * Check our list of addresses, to see if the packet is for us. 667 * If we don't have any addresses, assume any unicast packet 668 * we receive might be for us (and let the upper layers deal 669 * with it). 670 */ 671 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) && 672 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 673 goto ours; 674 675 /* 676 * Enable a consistency check between the destination address 677 * and the arrival interface for a unicast packet (the RFC 1122 678 * strong ES model) with a list of additional predicates: 679 * - if IP forwarding is disabled 680 * - the packet is not locally generated 681 * - the packet is not subject to 'ipfw fwd' 682 * - Interface is not running CARP. If the packet got here, we already 683 * checked it with carp_iamatch() and carp_forus(). 684 */ 685 strong_es = V_ip_strong_es && (V_ipforwarding == 0) && 686 ((ifp->if_flags & IFF_LOOPBACK) == 0) && 687 ifp->if_carp == NULL && (dchg == 0); 688 689 /* 690 * Check for exact addresses in the hash bucket. 691 */ 692 CK_LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 693 if (IA_SIN(ia)->sin_addr.s_addr != ip->ip_dst.s_addr) 694 continue; 695 696 /* 697 * net.inet.ip.rfc1122_strong_es: the address matches, verify 698 * that the packet arrived via the correct interface. 699 */ 700 if (__predict_false(strong_es && ia->ia_ifp != ifp)) { 701 IPSTAT_INC(ips_badaddr); 702 goto bad; 703 } 704 705 /* 706 * net.inet.ip.source_address_validation: drop incoming 707 * packets that pretend to be ours. 708 */ 709 if (V_ip_sav && !(ifp->if_flags & IFF_LOOPBACK) && 710 __predict_false(in_localip_fib(ip->ip_src, ifp->if_fib))) { 711 IPSTAT_INC(ips_badaddr); 712 goto bad; 713 } 714 715 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 716 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 717 goto ours; 718 } 719 720 /* 721 * Check for broadcast addresses. 722 * 723 * Only accept broadcast packets that arrive via the matching 724 * interface. Reception of forwarded directed broadcasts would 725 * be handled via ip_forward() and ether_output() with the loopback 726 * into the stack for SIMPLEX interfaces handled by ether_output(). 727 */ 728 if (ifp->if_flags & IFF_BROADCAST) { 729 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 730 if (ifa->ifa_addr->sa_family != AF_INET) 731 continue; 732 ia = ifatoia(ifa); 733 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 734 ip->ip_dst.s_addr) { 735 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 736 counter_u64_add(ia->ia_ifa.ifa_ibytes, 737 m->m_pkthdr.len); 738 goto ours; 739 } 740 #ifdef BOOTP_COMPAT 741 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 742 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 743 counter_u64_add(ia->ia_ifa.ifa_ibytes, 744 m->m_pkthdr.len); 745 goto ours; 746 } 747 #endif 748 } 749 ia = NULL; 750 } 751 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 752 /* 753 * RFC 3927 2.7: Do not forward multicast packets from 754 * IN_LINKLOCAL. 755 */ 756 if (V_ip_mrouter && !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 757 /* 758 * If we are acting as a multicast router, all 759 * incoming multicast packets are passed to the 760 * kernel-level multicast forwarding function. 761 * The packet is returned (relatively) intact; if 762 * ip_mforward() returns a non-zero value, the packet 763 * must be discarded, else it may be accepted below. 764 */ 765 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 766 IPSTAT_INC(ips_cantforward); 767 m_freem(m); 768 return; 769 } 770 771 /* 772 * The process-level routing daemon needs to receive 773 * all multicast IGMP packets, whether or not this 774 * host belongs to their destination groups. 775 */ 776 if (ip->ip_p == IPPROTO_IGMP) { 777 goto ours; 778 } 779 IPSTAT_INC(ips_forward); 780 } 781 /* 782 * Assume the packet is for us, to avoid prematurely taking 783 * a lock on the in_multi hash. Protocols must perform 784 * their own filtering and update statistics accordingly. 785 */ 786 goto ours; 787 } 788 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 789 goto ours; 790 if (ip->ip_dst.s_addr == INADDR_ANY) 791 goto ours; 792 /* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */ 793 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || 794 IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 795 IPSTAT_INC(ips_cantforward); 796 m_freem(m); 797 return; 798 } 799 800 /* 801 * Not for us; forward if possible and desirable. 802 */ 803 if (V_ipforwarding == 0) { 804 IPSTAT_INC(ips_cantforward); 805 m_freem(m); 806 } else { 807 ip_forward(m, dchg); 808 } 809 return; 810 811 ours: 812 #ifdef IPSTEALTH 813 /* 814 * IPSTEALTH: Process non-routing options only 815 * if the packet is destined for us. 816 */ 817 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 818 return; 819 #endif /* IPSTEALTH */ 820 821 /* 822 * We are going to ship the packet to the local protocol stack. Call the 823 * filter again for this 'output' action, allowing redirect-like rules 824 * to adjust the source address. 825 */ 826 if (PFIL_HOOKED_OUT(V_inet_local_pfil_head)) { 827 if (pfil_mbuf_out(V_inet_local_pfil_head, &m, V_loif, NULL) != 828 PFIL_PASS) 829 return; 830 if (m == NULL) /* consumed by filter */ 831 return; 832 ip = mtod(m, struct ip *); 833 } 834 835 /* 836 * Attempt reassembly; if it succeeds, proceed. 837 * ip_reass() will return a different mbuf. 838 */ 839 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 840 /* XXXGL: shouldn't we save & set m_flags? */ 841 m = ip_reass(m); 842 if (m == NULL) 843 return; 844 ip = mtod(m, struct ip *); 845 /* Get the header length of the reassembled packet */ 846 hlen = ip->ip_hl << 2; 847 } 848 849 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 850 if (IPSEC_ENABLED(ipv4)) { 851 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 852 return; 853 } 854 #endif /* IPSEC */ 855 856 /* 857 * Switch out to protocol's input routine. 858 */ 859 IPSTAT_INC(ips_delivered); 860 861 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 862 return; 863 bad: 864 m_freem(m); 865 } 866 867 int 868 ipproto_register(uint8_t proto, ipproto_input_t input, ipproto_ctlinput_t ctl) 869 { 870 871 MPASS(proto > 0); 872 873 /* 874 * The protocol slot must not be occupied by another protocol 875 * already. An index pointing to rip_input() is unused. 876 */ 877 if (ip_protox[proto] == rip_input) { 878 ip_protox[proto] = input; 879 ip_ctlprotox[proto] = ctl; 880 return (0); 881 } else 882 return (EEXIST); 883 } 884 885 int 886 ipproto_unregister(uint8_t proto) 887 { 888 889 MPASS(proto > 0); 890 891 if (ip_protox[proto] != rip_input) { 892 ip_protox[proto] = rip_input; 893 ip_ctlprotox[proto] = rip_ctlinput; 894 return (0); 895 } else 896 return (ENOENT); 897 } 898 899 /* 900 * Forward a packet. If some error occurs return the sender 901 * an icmp packet. Note we can't always generate a meaningful 902 * icmp message because icmp doesn't have a large enough repertoire 903 * of codes and types. 904 * 905 * If not forwarding, just drop the packet. This could be confusing 906 * if ipforwarding was zero but some routing protocol was advancing 907 * us as a gateway to somewhere. However, we must let the routing 908 * protocol deal with that. 909 * 910 * The srcrt parameter indicates whether the packet is being forwarded 911 * via a source route. 912 */ 913 void 914 ip_forward(struct mbuf *m, int srcrt) 915 { 916 struct ip *ip = mtod(m, struct ip *); 917 struct in_ifaddr *ia; 918 struct mbuf *mcopy; 919 struct sockaddr_in *sin; 920 struct in_addr dest; 921 struct route ro; 922 uint32_t flowid; 923 int error, type = 0, code = 0, mtu = 0; 924 925 NET_EPOCH_ASSERT(); 926 927 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 928 IPSTAT_INC(ips_cantforward); 929 m_freem(m); 930 return; 931 } 932 if ( 933 #ifdef IPSTEALTH 934 V_ipstealth == 0 && 935 #endif 936 ip->ip_ttl <= IPTTLDEC) { 937 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 938 return; 939 } 940 941 bzero(&ro, sizeof(ro)); 942 sin = (struct sockaddr_in *)&ro.ro_dst; 943 sin->sin_family = AF_INET; 944 sin->sin_len = sizeof(*sin); 945 sin->sin_addr = ip->ip_dst; 946 flowid = m->m_pkthdr.flowid; 947 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 948 if (ro.ro_nh != NULL) { 949 ia = ifatoia(ro.ro_nh->nh_ifa); 950 } else 951 ia = NULL; 952 /* 953 * Save the IP header and at most 8 bytes of the payload, 954 * in case we need to generate an ICMP message to the src. 955 * 956 * XXX this can be optimized a lot by saving the data in a local 957 * buffer on the stack (72 bytes at most), and only allocating the 958 * mbuf if really necessary. The vast majority of the packets 959 * are forwarded without having to send an ICMP back (either 960 * because unnecessary, or because rate limited), so we are 961 * really we are wasting a lot of work here. 962 * 963 * We don't use m_copym() because it might return a reference 964 * to a shared cluster. Both this function and ip_output() 965 * assume exclusive access to the IP header in `m', so any 966 * data in a cluster may change before we reach icmp_error(). 967 */ 968 mcopy = m_gethdr(M_NOWAIT, m->m_type); 969 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 970 /* 971 * It's probably ok if the pkthdr dup fails (because 972 * the deep copy of the tag chain failed), but for now 973 * be conservative and just discard the copy since 974 * code below may some day want the tags. 975 */ 976 m_free(mcopy); 977 mcopy = NULL; 978 } 979 if (mcopy != NULL) { 980 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 981 mcopy->m_pkthdr.len = mcopy->m_len; 982 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 983 } 984 #ifdef IPSTEALTH 985 if (V_ipstealth == 0) 986 #endif 987 ip->ip_ttl -= IPTTLDEC; 988 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 989 if (IPSEC_ENABLED(ipv4)) { 990 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 991 /* mbuf consumed by IPsec */ 992 RO_NHFREE(&ro); 993 m_freem(mcopy); 994 if (error != EINPROGRESS) 995 IPSTAT_INC(ips_cantforward); 996 return; 997 } 998 /* No IPsec processing required */ 999 } 1000 #endif /* IPSEC */ 1001 /* 1002 * If forwarding packet using same interface that it came in on, 1003 * perhaps should send a redirect to sender to shortcut a hop. 1004 * Only send redirect if source is sending directly to us, 1005 * and if packet was not source routed (or has any options). 1006 * Also, don't send redirect if forwarding using a default route 1007 * or a route modified by a redirect. 1008 */ 1009 dest.s_addr = 0; 1010 if (!srcrt && V_ipsendredirects && 1011 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1012 struct nhop_object *nh; 1013 1014 nh = ro.ro_nh; 1015 1016 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1017 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1018 u_long src = ntohl(ip->ip_src.s_addr); 1019 1020 if (nh_ia != NULL && 1021 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1022 /* Router requirements says to only send host redirects */ 1023 type = ICMP_REDIRECT; 1024 code = ICMP_REDIRECT_HOST; 1025 if (nh->nh_flags & NHF_GATEWAY) { 1026 if (nh->gw_sa.sa_family == AF_INET) 1027 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1028 else /* Do not redirect in case gw is AF_INET6 */ 1029 type = 0; 1030 } else 1031 dest.s_addr = ip->ip_dst.s_addr; 1032 } 1033 } 1034 } 1035 1036 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1037 1038 if (error == EMSGSIZE && ro.ro_nh) 1039 mtu = ro.ro_nh->nh_mtu; 1040 RO_NHFREE(&ro); 1041 1042 if (error) 1043 IPSTAT_INC(ips_cantforward); 1044 else { 1045 IPSTAT_INC(ips_forward); 1046 if (type) 1047 IPSTAT_INC(ips_redirectsent); 1048 else { 1049 if (mcopy) 1050 m_freem(mcopy); 1051 return; 1052 } 1053 } 1054 if (mcopy == NULL) 1055 return; 1056 1057 switch (error) { 1058 case 0: /* forwarded, but need redirect */ 1059 /* type, code set above */ 1060 break; 1061 1062 case ENETUNREACH: 1063 case EHOSTUNREACH: 1064 case ENETDOWN: 1065 case EHOSTDOWN: 1066 default: 1067 type = ICMP_UNREACH; 1068 code = ICMP_UNREACH_HOST; 1069 break; 1070 1071 case EMSGSIZE: 1072 type = ICMP_UNREACH; 1073 code = ICMP_UNREACH_NEEDFRAG; 1074 /* 1075 * If the MTU was set before make sure we are below the 1076 * interface MTU. 1077 * If the MTU wasn't set before use the interface mtu or 1078 * fall back to the next smaller mtu step compared to the 1079 * current packet size. 1080 */ 1081 if (mtu != 0) { 1082 if (ia != NULL) 1083 mtu = min(mtu, ia->ia_ifp->if_mtu); 1084 } else { 1085 if (ia != NULL) 1086 mtu = ia->ia_ifp->if_mtu; 1087 else 1088 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1089 } 1090 IPSTAT_INC(ips_cantfrag); 1091 break; 1092 1093 case ENOBUFS: 1094 case EACCES: /* ipfw denied packet */ 1095 m_freem(mcopy); 1096 return; 1097 } 1098 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1099 } 1100 1101 #define CHECK_SO_CT(sp, ct) \ 1102 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1103 1104 void 1105 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1106 struct mbuf *m) 1107 { 1108 bool stamped; 1109 1110 stamped = false; 1111 if ((inp->inp_socket->so_options & SO_BINTIME) || 1112 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1113 struct bintime boottimebin, bt; 1114 struct timespec ts1; 1115 1116 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1117 M_TSTMP)) { 1118 mbuf_tstmp2timespec(m, &ts1); 1119 timespec2bintime(&ts1, &bt); 1120 getboottimebin(&boottimebin); 1121 bintime_add(&bt, &boottimebin); 1122 } else { 1123 bintime(&bt); 1124 } 1125 *mp = sbcreatecontrol(&bt, sizeof(bt), SCM_BINTIME, 1126 SOL_SOCKET, M_NOWAIT); 1127 if (*mp != NULL) { 1128 mp = &(*mp)->m_next; 1129 stamped = true; 1130 } 1131 } 1132 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1133 struct bintime boottimebin, bt1; 1134 struct timespec ts1; 1135 struct timeval tv; 1136 1137 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1138 M_TSTMP)) { 1139 mbuf_tstmp2timespec(m, &ts1); 1140 timespec2bintime(&ts1, &bt1); 1141 getboottimebin(&boottimebin); 1142 bintime_add(&bt1, &boottimebin); 1143 bintime2timeval(&bt1, &tv); 1144 } else { 1145 microtime(&tv); 1146 } 1147 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, 1148 SOL_SOCKET, M_NOWAIT); 1149 if (*mp != NULL) { 1150 mp = &(*mp)->m_next; 1151 stamped = true; 1152 } 1153 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1154 struct bintime boottimebin; 1155 struct timespec ts, ts1; 1156 1157 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1158 M_TSTMP)) { 1159 mbuf_tstmp2timespec(m, &ts); 1160 getboottimebin(&boottimebin); 1161 bintime2timespec(&boottimebin, &ts1); 1162 timespecadd(&ts, &ts1, &ts); 1163 } else { 1164 nanotime(&ts); 1165 } 1166 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_REALTIME, 1167 SOL_SOCKET, M_NOWAIT); 1168 if (*mp != NULL) { 1169 mp = &(*mp)->m_next; 1170 stamped = true; 1171 } 1172 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1173 struct timespec ts; 1174 1175 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1176 M_TSTMP)) 1177 mbuf_tstmp2timespec(m, &ts); 1178 else 1179 nanouptime(&ts); 1180 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_MONOTONIC, 1181 SOL_SOCKET, M_NOWAIT); 1182 if (*mp != NULL) { 1183 mp = &(*mp)->m_next; 1184 stamped = true; 1185 } 1186 } 1187 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1188 M_TSTMP)) { 1189 struct sock_timestamp_info sti; 1190 1191 bzero(&sti, sizeof(sti)); 1192 sti.st_info_flags = ST_INFO_HW; 1193 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1194 sti.st_info_flags |= ST_INFO_HW_HPREC; 1195 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1196 SOL_SOCKET, M_NOWAIT); 1197 if (*mp != NULL) 1198 mp = &(*mp)->m_next; 1199 } 1200 if (inp->inp_flags & INP_RECVDSTADDR) { 1201 *mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr), 1202 IP_RECVDSTADDR, IPPROTO_IP, M_NOWAIT); 1203 if (*mp) 1204 mp = &(*mp)->m_next; 1205 } 1206 if (inp->inp_flags & INP_RECVTTL) { 1207 *mp = sbcreatecontrol(&ip->ip_ttl, sizeof(u_char), IP_RECVTTL, 1208 IPPROTO_IP, M_NOWAIT); 1209 if (*mp) 1210 mp = &(*mp)->m_next; 1211 } 1212 #ifdef notyet 1213 /* XXX 1214 * Moving these out of udp_input() made them even more broken 1215 * than they already were. 1216 */ 1217 /* options were tossed already */ 1218 if (inp->inp_flags & INP_RECVOPTS) { 1219 *mp = sbcreatecontrol(opts_deleted_above, 1220 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, M_NOWAIT); 1221 if (*mp) 1222 mp = &(*mp)->m_next; 1223 } 1224 /* ip_srcroute doesn't do what we want here, need to fix */ 1225 if (inp->inp_flags & INP_RECVRETOPTS) { 1226 *mp = sbcreatecontrol(ip_srcroute(m), sizeof(struct in_addr), 1227 IP_RECVRETOPTS, IPPROTO_IP, M_NOWAIT); 1228 if (*mp) 1229 mp = &(*mp)->m_next; 1230 } 1231 #endif 1232 if (inp->inp_flags & INP_RECVIF) { 1233 struct ifnet *ifp; 1234 struct sdlbuf { 1235 struct sockaddr_dl sdl; 1236 u_char pad[32]; 1237 } sdlbuf; 1238 struct sockaddr_dl *sdp; 1239 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1240 1241 if ((ifp = m->m_pkthdr.rcvif)) { 1242 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1243 /* 1244 * Change our mind and don't try copy. 1245 */ 1246 if (sdp->sdl_family != AF_LINK || 1247 sdp->sdl_len > sizeof(sdlbuf)) { 1248 goto makedummy; 1249 } 1250 bcopy(sdp, sdl2, sdp->sdl_len); 1251 } else { 1252 makedummy: 1253 sdl2->sdl_len = 1254 offsetof(struct sockaddr_dl, sdl_data[0]); 1255 sdl2->sdl_family = AF_LINK; 1256 sdl2->sdl_index = 0; 1257 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1258 } 1259 *mp = sbcreatecontrol(sdl2, sdl2->sdl_len, IP_RECVIF, 1260 IPPROTO_IP, M_NOWAIT); 1261 if (*mp) 1262 mp = &(*mp)->m_next; 1263 } 1264 if (inp->inp_flags & INP_RECVTOS) { 1265 *mp = sbcreatecontrol(&ip->ip_tos, sizeof(u_char), IP_RECVTOS, 1266 IPPROTO_IP, M_NOWAIT); 1267 if (*mp) 1268 mp = &(*mp)->m_next; 1269 } 1270 1271 if (inp->inp_flags2 & INP_RECVFLOWID) { 1272 uint32_t flowid, flow_type; 1273 1274 flowid = m->m_pkthdr.flowid; 1275 flow_type = M_HASHTYPE_GET(m); 1276 1277 /* 1278 * XXX should handle the failure of one or the 1279 * other - don't populate both? 1280 */ 1281 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IP_FLOWID, 1282 IPPROTO_IP, M_NOWAIT); 1283 if (*mp) 1284 mp = &(*mp)->m_next; 1285 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1286 IP_FLOWTYPE, IPPROTO_IP, M_NOWAIT); 1287 if (*mp) 1288 mp = &(*mp)->m_next; 1289 } 1290 1291 #ifdef RSS 1292 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1293 uint32_t flowid, flow_type; 1294 uint32_t rss_bucketid; 1295 1296 flowid = m->m_pkthdr.flowid; 1297 flow_type = M_HASHTYPE_GET(m); 1298 1299 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1300 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1301 IP_RSSBUCKETID, IPPROTO_IP, M_NOWAIT); 1302 if (*mp) 1303 mp = &(*mp)->m_next; 1304 } 1305 } 1306 #endif 1307 } 1308 1309 /* 1310 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1311 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1312 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1313 * compiled. 1314 */ 1315 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1316 VNET_DEFINE(struct socket *, ip_rsvpd); 1317 1318 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1319 1320 int 1321 ip_rsvp_init(struct socket *so) 1322 { 1323 1324 if (V_ip_rsvpd != NULL) 1325 return EADDRINUSE; 1326 1327 V_ip_rsvpd = so; 1328 /* 1329 * This may seem silly, but we need to be sure we don't over-increment 1330 * the RSVP counter, in case something slips up. 1331 */ 1332 if (!V_ip_rsvp_on) { 1333 V_ip_rsvp_on = 1; 1334 V_rsvp_on++; 1335 } 1336 1337 return 0; 1338 } 1339 1340 int 1341 ip_rsvp_done(void) 1342 { 1343 1344 V_ip_rsvpd = NULL; 1345 /* 1346 * This may seem silly, but we need to be sure we don't over-decrement 1347 * the RSVP counter, in case something slips up. 1348 */ 1349 if (V_ip_rsvp_on) { 1350 V_ip_rsvp_on = 0; 1351 V_rsvp_on--; 1352 } 1353 return 0; 1354 } 1355 1356 int 1357 rsvp_input(struct mbuf **mp, int *offp, int proto) 1358 { 1359 struct mbuf *m; 1360 1361 m = *mp; 1362 *mp = NULL; 1363 1364 if (rsvp_input_p) { /* call the real one if loaded */ 1365 *mp = m; 1366 rsvp_input_p(mp, offp, proto); 1367 return (IPPROTO_DONE); 1368 } 1369 1370 /* Can still get packets with rsvp_on = 0 if there is a local member 1371 * of the group to which the RSVP packet is addressed. But in this 1372 * case we want to throw the packet away. 1373 */ 1374 1375 if (!V_rsvp_on) { 1376 m_freem(m); 1377 return (IPPROTO_DONE); 1378 } 1379 1380 if (V_ip_rsvpd != NULL) { 1381 *mp = m; 1382 rip_input(mp, offp, proto); 1383 return (IPPROTO_DONE); 1384 } 1385 /* Drop the packet */ 1386 m_freem(m); 1387 return (IPPROTO_DONE); 1388 } 1389