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_rss.h" 37 #include "opt_sctp.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/hhook.h> 42 #include <sys/mbuf.h> 43 #include <sys/malloc.h> 44 #include <sys/domain.h> 45 #include <sys/protosw.h> 46 #include <sys/socket.h> 47 #include <sys/time.h> 48 #include <sys/kernel.h> 49 #include <sys/lock.h> 50 #include <sys/rmlock.h> 51 #include <sys/rwlock.h> 52 #include <sys/sdt.h> 53 #include <sys/syslog.h> 54 #include <sys/sysctl.h> 55 56 #include <net/if.h> 57 #include <net/if_types.h> 58 #include <net/if_var.h> 59 #include <net/if_dl.h> 60 #include <net/if_private.h> 61 #include <net/pfil.h> 62 #include <net/route.h> 63 #include <net/route/nhop.h> 64 #include <net/netisr.h> 65 #include <net/rss_config.h> 66 #include <net/vnet.h> 67 68 #include <netinet/in.h> 69 #include <netinet/in_kdtrace.h> 70 #include <netinet/in_systm.h> 71 #include <netinet/in_var.h> 72 #include <netinet/ip.h> 73 #include <netinet/in_fib.h> 74 #include <netinet/in_pcb.h> 75 #include <netinet/ip_var.h> 76 #include <netinet/ip_encap.h> 77 #include <netinet/ip_fw.h> 78 #include <netinet/ip_icmp.h> 79 #include <netinet/igmp_var.h> 80 #include <netinet/ip_options.h> 81 #include <machine/in_cksum.h> 82 #include <netinet/ip_carp.h> 83 #include <netinet/in_rss.h> 84 #include <netinet/ip_mroute.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 struct ifnet *ifp; 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 * XXXGL: we use SYSINIT() here, but go over V_ifnet. It was the same 382 * way before dom_ifattach removal. This worked because when any 383 * non-default vnet is created, there are no interfaces inside. 384 * Eventually this needs to be fixed. 385 */ 386 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 387 in_ifattach(NULL, ifp); 388 } 389 SYSINIT(ip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_init, NULL); 390 391 #ifdef VIMAGE 392 static void 393 ip_destroy(void *unused __unused) 394 { 395 int error; 396 397 #ifdef RSS 398 netisr_unregister_vnet(&ip_direct_nh); 399 #endif 400 netisr_unregister_vnet(&ip_nh); 401 402 pfil_head_unregister(V_inet_pfil_head); 403 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]); 404 if (error != 0) { 405 printf("%s: WARNING: unable to deregister input helper hook " 406 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: " 407 "error %d returned\n", __func__, error); 408 } 409 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]); 410 if (error != 0) { 411 printf("%s: WARNING: unable to deregister output helper hook " 412 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: " 413 "error %d returned\n", __func__, error); 414 } 415 416 /* Remove the IPv4 addresses from all interfaces. */ 417 in_ifscrub_all(); 418 419 /* Make sure the IPv4 routes are gone as well. */ 420 rib_flush_routes_family(AF_INET); 421 422 /* Destroy IP reassembly queue. */ 423 ipreass_destroy(); 424 425 /* Cleanup in_ifaddr hash table; should be empty. */ 426 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask); 427 } 428 429 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL); 430 #endif 431 432 #ifdef RSS 433 /* 434 * IP direct input routine. 435 * 436 * This is called when reinjecting completed fragments where 437 * all of the previous checking and book-keeping has been done. 438 */ 439 void 440 ip_direct_input(struct mbuf *m) 441 { 442 struct ip *ip; 443 int hlen; 444 445 ip = mtod(m, struct ip *); 446 hlen = ip->ip_hl << 2; 447 448 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 449 if (IPSEC_ENABLED(ipv4)) { 450 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 451 return; 452 } 453 #endif /* IPSEC */ 454 IPSTAT_INC(ips_delivered); 455 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 456 } 457 #endif 458 459 /* 460 * Ip input routine. Checksum and byte swap header. If fragmented 461 * try to reassemble. Process options. Pass to next level. 462 */ 463 void 464 ip_input(struct mbuf *m) 465 { 466 struct ip *ip = NULL; 467 struct in_ifaddr *ia = NULL; 468 struct ifaddr *ifa; 469 struct ifnet *ifp; 470 int hlen = 0; 471 uint16_t sum, ip_len; 472 int dchg = 0; /* dest changed after fw */ 473 struct in_addr odst; /* original dst address */ 474 bool strong_es; 475 476 M_ASSERTPKTHDR(m); 477 NET_EPOCH_ASSERT(); 478 479 if (m->m_flags & M_FASTFWD_OURS) { 480 m->m_flags &= ~M_FASTFWD_OURS; 481 /* Set up some basics that will be used later. */ 482 ip = mtod(m, struct ip *); 483 hlen = ip->ip_hl << 2; 484 ip_len = ntohs(ip->ip_len); 485 goto ours; 486 } 487 488 IPSTAT_INC(ips_total); 489 490 if (__predict_false(m->m_pkthdr.len < sizeof(struct ip))) 491 goto tooshort; 492 493 if (m->m_len < sizeof(struct ip)) { 494 m = m_pullup(m, sizeof(struct ip)); 495 if (__predict_false(m == NULL)) { 496 IPSTAT_INC(ips_toosmall); 497 return; 498 } 499 } 500 ip = mtod(m, struct ip *); 501 502 if (__predict_false(ip->ip_v != IPVERSION)) { 503 IPSTAT_INC(ips_badvers); 504 goto bad; 505 } 506 507 hlen = ip->ip_hl << 2; 508 if (__predict_false(hlen < sizeof(struct ip))) { /* minimum header length */ 509 IPSTAT_INC(ips_badhlen); 510 goto bad; 511 } 512 if (hlen > m->m_len) { 513 m = m_pullup(m, hlen); 514 if (__predict_false(m == NULL)) { 515 IPSTAT_INC(ips_badhlen); 516 return; 517 } 518 ip = mtod(m, struct ip *); 519 } 520 521 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 522 523 /* IN_LOOPBACK must not appear on the wire - RFC1122 */ 524 ifp = m->m_pkthdr.rcvif; 525 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 526 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 527 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 528 IPSTAT_INC(ips_badaddr); 529 goto bad; 530 } 531 } 532 533 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 534 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 535 } else if (m->m_pkthdr.csum_flags & CSUM_IP) { 536 /* 537 * Packet from local host that offloaded checksum computation. 538 * Checksum not required since the packet wasn't on the wire. 539 */ 540 sum = 0; 541 } else { 542 if (hlen == sizeof(struct ip)) { 543 sum = in_cksum_hdr(ip); 544 } else { 545 sum = in_cksum(m, hlen); 546 } 547 } 548 if (__predict_false(sum)) { 549 IPSTAT_INC(ips_badsum); 550 goto bad; 551 } 552 553 ip_len = ntohs(ip->ip_len); 554 if (__predict_false(ip_len < hlen)) { 555 IPSTAT_INC(ips_badlen); 556 goto bad; 557 } 558 559 /* 560 * Check that the amount of data in the buffers 561 * is as at least much as the IP header would have us expect. 562 * Trim mbufs if longer than we expect. 563 * Drop packet if shorter than we expect. 564 */ 565 if (__predict_false(m->m_pkthdr.len < ip_len)) { 566 tooshort: 567 IPSTAT_INC(ips_tooshort); 568 goto bad; 569 } 570 if (m->m_pkthdr.len > ip_len) { 571 if (m->m_len == m->m_pkthdr.len) { 572 m->m_len = ip_len; 573 m->m_pkthdr.len = ip_len; 574 } else 575 m_adj(m, ip_len - m->m_pkthdr.len); 576 } 577 578 /* 579 * Try to forward the packet, but if we fail continue. 580 * ip_tryforward() may generate redirects these days. 581 * XXX the logic below falling through to normal processing 582 * if redirects are required should be revisited as well. 583 * ip_tryforward() does inbound and outbound packet firewall 584 * processing. If firewall has decided that destination becomes 585 * our local address, it sets M_FASTFWD_OURS flag. In this 586 * case skip another inbound firewall processing and update 587 * ip pointer. 588 */ 589 if (V_ipforwarding != 0 590 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 591 && (!IPSEC_ENABLED(ipv4) || 592 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 593 #endif 594 ) { 595 /* 596 * ip_dooptions() was run so we can ignore the source route (or 597 * any IP options case) case for redirects in ip_tryforward(). 598 */ 599 if ((m = ip_tryforward(m)) == NULL) 600 return; 601 if (m->m_flags & M_FASTFWD_OURS) { 602 m->m_flags &= ~M_FASTFWD_OURS; 603 ip = mtod(m, struct ip *); 604 goto ours; 605 } 606 } 607 608 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 609 /* 610 * Bypass packet filtering for packets previously handled by IPsec. 611 */ 612 if (IPSEC_ENABLED(ipv4) && 613 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 614 goto passin; 615 #endif 616 617 /* 618 * Run through list of hooks for input packets. 619 * 620 * NB: Beware of the destination address changing (e.g. 621 * by NAT rewriting). When this happens, tell 622 * ip_forward to do the right thing. 623 */ 624 625 /* Jump over all PFIL processing if hooks are not active. */ 626 if (!PFIL_HOOKED_IN(V_inet_pfil_head)) 627 goto passin; 628 629 odst = ip->ip_dst; 630 if (pfil_mbuf_in(V_inet_pfil_head, &m, ifp, NULL) != 631 PFIL_PASS) 632 return; 633 634 ip = mtod(m, struct ip *); 635 dchg = (odst.s_addr != ip->ip_dst.s_addr); 636 637 if (m->m_flags & M_FASTFWD_OURS) { 638 m->m_flags &= ~M_FASTFWD_OURS; 639 goto ours; 640 } 641 if (m->m_flags & M_IP_NEXTHOP) { 642 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 643 /* 644 * Directly ship the packet on. This allows 645 * forwarding packets originally destined to us 646 * to some other directly connected host. 647 */ 648 ip_forward(m, 1); 649 return; 650 } 651 } 652 passin: 653 /* 654 * The unspecified address can appear only as a src address - RFC1122. 655 * 656 * The check is deferred to here to give firewalls a chance to block 657 * (and log) such packets. ip_tryforward() will not process such 658 * packets. 659 */ 660 if (__predict_false(ntohl(ip->ip_dst.s_addr) == INADDR_ANY)) { 661 IPSTAT_INC(ips_badaddr); 662 goto bad; 663 } 664 665 /* 666 * Process options and, if not destined for us, 667 * ship it on. ip_dooptions returns 1 when an 668 * error was detected (causing an icmp message 669 * to be sent and the original packet to be freed). 670 */ 671 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 672 return; 673 674 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 675 * matter if it is destined to another node, or whether it is 676 * a multicast one, RSVP wants it! and prevents it from being forwarded 677 * anywhere else. Also checks if the rsvp daemon is running before 678 * grabbing the packet. 679 */ 680 if (ip->ip_p == IPPROTO_RSVP && V_rsvp_on) 681 goto ours; 682 683 /* 684 * Check our list of addresses, to see if the packet is for us. 685 * If we don't have any addresses, assume any unicast packet 686 * we receive might be for us (and let the upper layers deal 687 * with it). 688 */ 689 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) && 690 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 691 goto ours; 692 693 /* 694 * Enable a consistency check between the destination address 695 * and the arrival interface for a unicast packet (the RFC 1122 696 * strong ES model) with a list of additional predicates: 697 * - if IP forwarding is disabled 698 * - the packet is not locally generated 699 * - the packet is not subject to 'ipfw fwd' 700 * - Interface is not running CARP. If the packet got here, we already 701 * checked it with carp_iamatch() and carp_forus(). 702 */ 703 strong_es = V_ip_strong_es && (V_ipforwarding == 0) && 704 ((ifp->if_flags & IFF_LOOPBACK) == 0) && 705 ifp->if_carp == NULL && (dchg == 0); 706 707 /* 708 * Check for exact addresses in the hash bucket. 709 */ 710 CK_LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 711 if (IA_SIN(ia)->sin_addr.s_addr != ip->ip_dst.s_addr) 712 continue; 713 714 /* 715 * net.inet.ip.rfc1122_strong_es: the address matches, verify 716 * that the packet arrived via the correct interface. 717 */ 718 if (__predict_false(strong_es && ia->ia_ifp != ifp)) { 719 IPSTAT_INC(ips_badaddr); 720 goto bad; 721 } 722 723 /* 724 * net.inet.ip.source_address_validation: drop incoming 725 * packets that pretend to be ours. 726 */ 727 if (V_ip_sav && !(ifp->if_flags & IFF_LOOPBACK) && 728 __predict_false(in_localip_fib(ip->ip_src, ifp->if_fib))) { 729 IPSTAT_INC(ips_badaddr); 730 goto bad; 731 } 732 733 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 734 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 735 goto ours; 736 } 737 738 /* 739 * Check for broadcast addresses. 740 * 741 * Only accept broadcast packets that arrive via the matching 742 * interface. Reception of forwarded directed broadcasts would 743 * be handled via ip_forward() and ether_output() with the loopback 744 * into the stack for SIMPLEX interfaces handled by ether_output(). 745 */ 746 if (ifp->if_flags & IFF_BROADCAST) { 747 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 748 if (ifa->ifa_addr->sa_family != AF_INET) 749 continue; 750 ia = ifatoia(ifa); 751 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 752 ip->ip_dst.s_addr) { 753 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 754 counter_u64_add(ia->ia_ifa.ifa_ibytes, 755 m->m_pkthdr.len); 756 goto ours; 757 } 758 #ifdef BOOTP_COMPAT 759 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 760 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 761 counter_u64_add(ia->ia_ifa.ifa_ibytes, 762 m->m_pkthdr.len); 763 goto ours; 764 } 765 #endif 766 } 767 ia = NULL; 768 } 769 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 770 /* 771 * RFC 3927 2.7: Do not forward multicast packets from 772 * IN_LINKLOCAL. 773 */ 774 if (V_ip_mrouting_enabled && 775 !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 776 /* 777 * If we are acting as a multicast router, all 778 * incoming multicast packets are passed to the 779 * kernel-level multicast forwarding function. 780 * The packet is returned (relatively) intact; if 781 * ip_mforward() returns a non-zero value, the packet 782 * must be discarded, else it may be accepted below. 783 */ 784 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 785 IPSTAT_INC(ips_cantforward); 786 m_freem(m); 787 return; 788 } 789 790 /* 791 * The process-level routing daemon needs to receive 792 * all multicast IGMP packets, whether or not this 793 * host belongs to their destination groups. 794 */ 795 if (ip->ip_p == IPPROTO_IGMP) { 796 goto ours; 797 } 798 IPSTAT_INC(ips_forward); 799 } 800 /* 801 * Assume the packet is for us, to avoid prematurely taking 802 * a lock on the in_multi hash. Protocols must perform 803 * their own filtering and update statistics accordingly. 804 */ 805 goto ours; 806 } 807 if (in_broadcast(ip->ip_dst)) 808 goto ours; 809 /* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */ 810 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || 811 IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 812 IPSTAT_INC(ips_cantforward); 813 m_freem(m); 814 return; 815 } 816 817 /* 818 * Not for us; forward if possible and desirable. 819 */ 820 if (V_ipforwarding == 0) { 821 IPSTAT_INC(ips_cantforward); 822 m_freem(m); 823 } else { 824 ip_forward(m, dchg); 825 } 826 return; 827 828 ours: 829 #ifdef IPSTEALTH 830 /* 831 * IPSTEALTH: Process non-routing options only 832 * if the packet is destined for us. 833 */ 834 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 835 return; 836 #endif /* IPSTEALTH */ 837 838 /* 839 * We are going to ship the packet to the local protocol stack. Call the 840 * filter again for this 'output' action, allowing redirect-like rules 841 * to adjust the source address. 842 */ 843 if (PFIL_HOOKED_OUT(V_inet_local_pfil_head)) { 844 if (pfil_mbuf_out(V_inet_local_pfil_head, &m, V_loif, NULL) != 845 PFIL_PASS) 846 return; 847 ip = mtod(m, struct ip *); 848 } 849 850 /* 851 * Attempt reassembly; if it succeeds, proceed. 852 * ip_reass() will return a different mbuf. 853 */ 854 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 855 /* XXXGL: shouldn't we save & set m_flags? */ 856 m = ip_reass(m); 857 if (m == NULL) 858 return; 859 ip = mtod(m, struct ip *); 860 /* Get the header length of the reassembled packet */ 861 hlen = ip->ip_hl << 2; 862 } 863 864 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 865 if (IPSEC_ENABLED(ipv4)) { 866 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 867 return; 868 } 869 #endif /* IPSEC */ 870 871 /* 872 * Switch out to protocol's input routine. 873 */ 874 IPSTAT_INC(ips_delivered); 875 876 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 877 return; 878 bad: 879 m_freem(m); 880 } 881 882 int 883 ipproto_register(uint8_t proto, ipproto_input_t input, ipproto_ctlinput_t ctl) 884 { 885 886 MPASS(proto > 0); 887 888 /* 889 * The protocol slot must not be occupied by another protocol 890 * already. An index pointing to rip_input() is unused. 891 */ 892 if (ip_protox[proto] == rip_input) { 893 ip_protox[proto] = input; 894 ip_ctlprotox[proto] = ctl; 895 return (0); 896 } else 897 return (EEXIST); 898 } 899 900 int 901 ipproto_unregister(uint8_t proto) 902 { 903 904 MPASS(proto > 0); 905 906 if (ip_protox[proto] != rip_input) { 907 ip_protox[proto] = rip_input; 908 ip_ctlprotox[proto] = rip_ctlinput; 909 return (0); 910 } else 911 return (ENOENT); 912 } 913 914 /* 915 * Forward a packet. If some error occurs return the sender 916 * an icmp packet. Note we can't always generate a meaningful 917 * icmp message because icmp doesn't have a large enough repertoire 918 * of codes and types. 919 * 920 * If not forwarding, just drop the packet. This could be confusing 921 * if ipforwarding was zero but some routing protocol was advancing 922 * us as a gateway to somewhere. However, we must let the routing 923 * protocol deal with that. 924 * 925 * The srcrt parameter indicates whether the packet is being forwarded 926 * via a source route. 927 */ 928 void 929 ip_forward(struct mbuf *m, int srcrt) 930 { 931 struct ip *ip = mtod(m, struct ip *); 932 struct in_ifaddr *ia; 933 struct mbuf *mcopy; 934 struct sockaddr_in *sin; 935 struct in_addr dest; 936 struct route ro; 937 uint32_t flowid; 938 int error, type = 0, code = 0, mtu = 0; 939 940 NET_EPOCH_ASSERT(); 941 942 if (m->m_flags & (M_BCAST|M_MCAST) || !in_canforward(ip->ip_dst)) { 943 IPSTAT_INC(ips_cantforward); 944 m_freem(m); 945 return; 946 } 947 if ( 948 #ifdef IPSTEALTH 949 V_ipstealth == 0 && 950 #endif 951 ip->ip_ttl <= IPTTLDEC) { 952 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 953 return; 954 } 955 956 bzero(&ro, sizeof(ro)); 957 sin = (struct sockaddr_in *)&ro.ro_dst; 958 sin->sin_family = AF_INET; 959 sin->sin_len = sizeof(*sin); 960 sin->sin_addr = ip->ip_dst; 961 flowid = m->m_pkthdr.flowid; 962 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 963 if (ro.ro_nh != NULL) { 964 if (ro.ro_nh->nh_flags & (NHF_BLACKHOLE | NHF_BROADCAST)) { 965 IPSTAT_INC(ips_cantforward); 966 m_freem(m); 967 NH_FREE(ro.ro_nh); 968 return; 969 } 970 if (ro.ro_nh->nh_flags & NHF_REJECT) { 971 IPSTAT_INC(ips_cantforward); 972 NH_FREE(ro.ro_nh); 973 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 974 return; 975 } 976 ia = ifatoia(ro.ro_nh->nh_ifa); 977 } else 978 ia = NULL; 979 /* 980 * Save the IP header and at most 8 bytes of the payload, 981 * in case we need to generate an ICMP message to the src. 982 * 983 * XXX this can be optimized a lot by saving the data in a local 984 * buffer on the stack (72 bytes at most), and only allocating the 985 * mbuf if really necessary. The vast majority of the packets 986 * are forwarded without having to send an ICMP back (either 987 * because unnecessary, or because rate limited), so we are 988 * really we are wasting a lot of work here. 989 * 990 * We don't use m_copym() because it might return a reference 991 * to a shared cluster. Both this function and ip_output() 992 * assume exclusive access to the IP header in `m', so any 993 * data in a cluster may change before we reach icmp_error(). 994 */ 995 mcopy = m_gethdr(M_NOWAIT, m->m_type); 996 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 997 /* 998 * It's probably ok if the pkthdr dup fails (because 999 * the deep copy of the tag chain failed), but for now 1000 * be conservative and just discard the copy since 1001 * code below may some day want the tags. 1002 */ 1003 m_free(mcopy); 1004 mcopy = NULL; 1005 } 1006 if (mcopy != NULL) { 1007 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 1008 mcopy->m_pkthdr.len = mcopy->m_len; 1009 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 1010 } 1011 #ifdef IPSTEALTH 1012 if (V_ipstealth == 0) 1013 #endif 1014 ip->ip_ttl -= IPTTLDEC; 1015 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1016 if (IPSEC_ENABLED(ipv4)) { 1017 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 1018 /* mbuf consumed by IPsec */ 1019 RO_NHFREE(&ro); 1020 m_freem(mcopy); 1021 if (error != EINPROGRESS) 1022 IPSTAT_INC(ips_cantforward); 1023 return; 1024 } 1025 /* No IPsec processing required */ 1026 } 1027 #endif /* IPSEC */ 1028 /* 1029 * If forwarding packet using same interface that it came in on, 1030 * perhaps should send a redirect to sender to shortcut a hop. 1031 * Only send redirect if source is sending directly to us, 1032 * and if packet was not source routed (or has any options). 1033 * Also, don't send redirect if forwarding using a default route 1034 * or a route modified by a redirect. 1035 */ 1036 dest.s_addr = 0; 1037 if (!srcrt && V_ipsendredirects && 1038 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1039 struct nhop_object *nh; 1040 1041 nh = ro.ro_nh; 1042 1043 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1044 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1045 u_long src = ntohl(ip->ip_src.s_addr); 1046 1047 if (nh_ia != NULL && 1048 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1049 /* Router requirements says to only send host redirects */ 1050 type = ICMP_REDIRECT; 1051 code = ICMP_REDIRECT_HOST; 1052 if (nh->nh_flags & NHF_GATEWAY) { 1053 if (nh->gw_sa.sa_family == AF_INET) 1054 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1055 else /* Do not redirect in case gw is AF_INET6 */ 1056 type = 0; 1057 } else 1058 dest.s_addr = ip->ip_dst.s_addr; 1059 } 1060 } 1061 } 1062 1063 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1064 1065 if (error == EMSGSIZE && ro.ro_nh) 1066 mtu = ro.ro_nh->nh_mtu; 1067 RO_NHFREE(&ro); 1068 1069 if (error) 1070 IPSTAT_INC(ips_cantforward); 1071 else { 1072 IPSTAT_INC(ips_forward); 1073 if (type) 1074 IPSTAT_INC(ips_redirectsent); 1075 else { 1076 if (mcopy) 1077 m_freem(mcopy); 1078 return; 1079 } 1080 } 1081 if (mcopy == NULL) 1082 return; 1083 1084 switch (error) { 1085 case 0: /* forwarded, but need redirect */ 1086 /* type, code set above */ 1087 break; 1088 1089 case ENETUNREACH: 1090 case EHOSTUNREACH: 1091 case ENETDOWN: 1092 case EHOSTDOWN: 1093 default: 1094 type = ICMP_UNREACH; 1095 code = ICMP_UNREACH_HOST; 1096 break; 1097 1098 case EMSGSIZE: 1099 type = ICMP_UNREACH; 1100 code = ICMP_UNREACH_NEEDFRAG; 1101 /* 1102 * If the MTU was set before make sure we are below the 1103 * interface MTU. 1104 * If the MTU wasn't set before use the interface mtu or 1105 * fall back to the next smaller mtu step compared to the 1106 * current packet size. 1107 */ 1108 if (mtu != 0) { 1109 if (ia != NULL) 1110 mtu = min(mtu, ia->ia_ifp->if_mtu); 1111 } else { 1112 if (ia != NULL) 1113 mtu = ia->ia_ifp->if_mtu; 1114 else 1115 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1116 } 1117 IPSTAT_INC(ips_cantfrag); 1118 break; 1119 1120 case ENOBUFS: 1121 case EACCES: /* ipfw denied packet */ 1122 m_freem(mcopy); 1123 return; 1124 } 1125 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1126 } 1127 1128 #define CHECK_SO_CT(sp, ct) \ 1129 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1130 1131 void 1132 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1133 struct mbuf *m) 1134 { 1135 bool stamped; 1136 1137 stamped = false; 1138 if ((inp->inp_socket->so_options & SO_BINTIME) || 1139 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1140 struct bintime boottimebin, bt; 1141 struct timespec ts1; 1142 1143 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1144 M_TSTMP)) { 1145 mbuf_tstmp2timespec(m, &ts1); 1146 timespec2bintime(&ts1, &bt); 1147 getboottimebin(&boottimebin); 1148 bintime_add(&bt, &boottimebin); 1149 } else { 1150 bintime(&bt); 1151 } 1152 *mp = sbcreatecontrol(&bt, sizeof(bt), SCM_BINTIME, 1153 SOL_SOCKET, M_NOWAIT); 1154 if (*mp != NULL) { 1155 mp = &(*mp)->m_next; 1156 stamped = true; 1157 } 1158 } 1159 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1160 struct bintime boottimebin, bt1; 1161 struct timespec ts1; 1162 struct timeval tv; 1163 1164 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1165 M_TSTMP)) { 1166 mbuf_tstmp2timespec(m, &ts1); 1167 timespec2bintime(&ts1, &bt1); 1168 getboottimebin(&boottimebin); 1169 bintime_add(&bt1, &boottimebin); 1170 bintime2timeval(&bt1, &tv); 1171 } else { 1172 microtime(&tv); 1173 } 1174 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, 1175 SOL_SOCKET, M_NOWAIT); 1176 if (*mp != NULL) { 1177 mp = &(*mp)->m_next; 1178 stamped = true; 1179 } 1180 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1181 struct bintime boottimebin; 1182 struct timespec ts, ts1; 1183 1184 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1185 M_TSTMP)) { 1186 mbuf_tstmp2timespec(m, &ts); 1187 getboottimebin(&boottimebin); 1188 bintime2timespec(&boottimebin, &ts1); 1189 timespecadd(&ts, &ts1, &ts); 1190 } else { 1191 nanotime(&ts); 1192 } 1193 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_REALTIME, 1194 SOL_SOCKET, M_NOWAIT); 1195 if (*mp != NULL) { 1196 mp = &(*mp)->m_next; 1197 stamped = true; 1198 } 1199 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1200 struct timespec ts; 1201 1202 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1203 M_TSTMP)) 1204 mbuf_tstmp2timespec(m, &ts); 1205 else 1206 nanouptime(&ts); 1207 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_MONOTONIC, 1208 SOL_SOCKET, M_NOWAIT); 1209 if (*mp != NULL) { 1210 mp = &(*mp)->m_next; 1211 stamped = true; 1212 } 1213 } 1214 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1215 M_TSTMP)) { 1216 struct sock_timestamp_info sti; 1217 1218 bzero(&sti, sizeof(sti)); 1219 sti.st_info_flags = ST_INFO_HW; 1220 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1221 sti.st_info_flags |= ST_INFO_HW_HPREC; 1222 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1223 SOL_SOCKET, M_NOWAIT); 1224 if (*mp != NULL) 1225 mp = &(*mp)->m_next; 1226 } 1227 if (inp->inp_flags & INP_RECVDSTADDR) { 1228 *mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr), 1229 IP_RECVDSTADDR, IPPROTO_IP, M_NOWAIT); 1230 if (*mp) 1231 mp = &(*mp)->m_next; 1232 } 1233 if (inp->inp_flags & INP_RECVTTL) { 1234 *mp = sbcreatecontrol(&ip->ip_ttl, sizeof(u_char), IP_RECVTTL, 1235 IPPROTO_IP, M_NOWAIT); 1236 if (*mp) 1237 mp = &(*mp)->m_next; 1238 } 1239 #ifdef notyet 1240 /* XXX 1241 * Moving these out of udp_input() made them even more broken 1242 * than they already were. 1243 */ 1244 /* options were tossed already */ 1245 if (inp->inp_flags & INP_RECVOPTS) { 1246 *mp = sbcreatecontrol(opts_deleted_above, 1247 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, M_NOWAIT); 1248 if (*mp) 1249 mp = &(*mp)->m_next; 1250 } 1251 /* ip_srcroute doesn't do what we want here, need to fix */ 1252 if (inp->inp_flags & INP_RECVRETOPTS) { 1253 *mp = sbcreatecontrol(ip_srcroute(m), sizeof(struct in_addr), 1254 IP_RECVRETOPTS, IPPROTO_IP, M_NOWAIT); 1255 if (*mp) 1256 mp = &(*mp)->m_next; 1257 } 1258 #endif 1259 if (inp->inp_flags & INP_RECVIF) { 1260 struct ifnet *ifp; 1261 struct sdlbuf { 1262 struct sockaddr_dl sdl; 1263 u_char pad[32]; 1264 } sdlbuf; 1265 struct sockaddr_dl *sdp; 1266 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1267 1268 if ((ifp = m->m_pkthdr.rcvif)) { 1269 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1270 /* 1271 * Change our mind and don't try copy. 1272 */ 1273 if (sdp->sdl_family != AF_LINK || 1274 sdp->sdl_len > sizeof(sdlbuf)) { 1275 goto makedummy; 1276 } 1277 bcopy(sdp, sdl2, sdp->sdl_len); 1278 } else { 1279 makedummy: 1280 sdl2->sdl_len = 1281 offsetof(struct sockaddr_dl, sdl_data[0]); 1282 sdl2->sdl_family = AF_LINK; 1283 sdl2->sdl_index = 0; 1284 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1285 } 1286 *mp = sbcreatecontrol(sdl2, sdl2->sdl_len, IP_RECVIF, 1287 IPPROTO_IP, M_NOWAIT); 1288 if (*mp) 1289 mp = &(*mp)->m_next; 1290 } 1291 if (inp->inp_flags & INP_RECVTOS) { 1292 *mp = sbcreatecontrol(&ip->ip_tos, sizeof(u_char), IP_RECVTOS, 1293 IPPROTO_IP, M_NOWAIT); 1294 if (*mp) 1295 mp = &(*mp)->m_next; 1296 } 1297 1298 if (inp->inp_flags2 & INP_RECVFLOWID) { 1299 uint32_t flowid, flow_type; 1300 1301 flowid = m->m_pkthdr.flowid; 1302 flow_type = M_HASHTYPE_GET(m); 1303 1304 /* 1305 * XXX should handle the failure of one or the 1306 * other - don't populate both? 1307 */ 1308 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IP_FLOWID, 1309 IPPROTO_IP, M_NOWAIT); 1310 if (*mp) 1311 mp = &(*mp)->m_next; 1312 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1313 IP_FLOWTYPE, IPPROTO_IP, M_NOWAIT); 1314 if (*mp) 1315 mp = &(*mp)->m_next; 1316 } 1317 1318 #ifdef RSS 1319 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1320 uint32_t flowid, flow_type; 1321 uint32_t rss_bucketid; 1322 1323 flowid = m->m_pkthdr.flowid; 1324 flow_type = M_HASHTYPE_GET(m); 1325 1326 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1327 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1328 IP_RSSBUCKETID, IPPROTO_IP, M_NOWAIT); 1329 if (*mp) 1330 mp = &(*mp)->m_next; 1331 } 1332 } 1333 #endif 1334 } 1335 1336 /* 1337 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1338 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1339 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1340 * compiled. 1341 */ 1342 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1343 VNET_DEFINE(struct socket *, ip_rsvpd); 1344 1345 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1346 1347 int 1348 ip_rsvp_init(struct socket *so) 1349 { 1350 1351 if (V_ip_rsvpd != NULL) 1352 return EADDRINUSE; 1353 1354 V_ip_rsvpd = so; 1355 /* 1356 * This may seem silly, but we need to be sure we don't over-increment 1357 * the RSVP counter, in case something slips up. 1358 */ 1359 if (!V_ip_rsvp_on) { 1360 V_ip_rsvp_on = 1; 1361 V_rsvp_on++; 1362 } 1363 1364 return 0; 1365 } 1366 1367 int 1368 ip_rsvp_done(void) 1369 { 1370 1371 V_ip_rsvpd = NULL; 1372 /* 1373 * This may seem silly, but we need to be sure we don't over-decrement 1374 * the RSVP counter, in case something slips up. 1375 */ 1376 if (V_ip_rsvp_on) { 1377 V_ip_rsvp_on = 0; 1378 V_rsvp_on--; 1379 } 1380 return 0; 1381 } 1382 1383 int 1384 rsvp_input(struct mbuf **mp, int *offp, int proto) 1385 { 1386 struct mbuf *m; 1387 1388 m = *mp; 1389 *mp = NULL; 1390 1391 if (rsvp_input_p) { /* call the real one if loaded */ 1392 *mp = m; 1393 rsvp_input_p(mp, offp, proto); 1394 return (IPPROTO_DONE); 1395 } 1396 1397 /* Can still get packets with rsvp_on = 0 if there is a local member 1398 * of the group to which the RSVP packet is addressed. But in this 1399 * case we want to throw the packet away. 1400 */ 1401 1402 if (!V_rsvp_on) { 1403 m_freem(m); 1404 return (IPPROTO_DONE); 1405 } 1406 1407 if (V_ip_rsvpd != NULL) { 1408 *mp = m; 1409 rip_input(mp, offp, proto); 1410 return (IPPROTO_DONE); 1411 } 1412 /* Drop the packet */ 1413 m_freem(m); 1414 return (IPPROTO_DONE); 1415 } 1416