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 #include <netinet/ip_mroute.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 struct ifnet *ifp; 357 358 ipreass_init(); 359 360 /* 361 * Register statically compiled protocols, that are unlikely to 362 * ever become dynamic. 363 */ 364 IPPROTO_REGISTER(IPPROTO_ICMP, icmp_input, NULL); 365 IPPROTO_REGISTER(IPPROTO_IGMP, igmp_input, NULL); 366 IPPROTO_REGISTER(IPPROTO_RSVP, rsvp_input, NULL); 367 IPPROTO_REGISTER(IPPROTO_IPV4, encap4_input, NULL); 368 IPPROTO_REGISTER(IPPROTO_MOBILE, encap4_input, NULL); 369 IPPROTO_REGISTER(IPPROTO_ETHERIP, encap4_input, NULL); 370 IPPROTO_REGISTER(IPPROTO_GRE, encap4_input, NULL); 371 IPPROTO_REGISTER(IPPROTO_IPV6, encap4_input, NULL); 372 IPPROTO_REGISTER(IPPROTO_PIM, encap4_input, NULL); 373 #ifdef SCTP /* XXX: has a loadable & static version */ 374 IPPROTO_REGISTER(IPPROTO_SCTP, sctp_input, sctp_ctlinput); 375 #endif 376 377 netisr_register(&ip_nh); 378 #ifdef RSS 379 netisr_register(&ip_direct_nh); 380 #endif 381 /* 382 * XXXGL: we use SYSINIT() here, but go over V_ifnet. It was the same 383 * way before dom_ifattach removal. This worked because when any 384 * non-default vnet is created, there are no interfaces inside. 385 * Eventually this needs to be fixed. 386 */ 387 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 388 in_ifattach(NULL, ifp); 389 } 390 SYSINIT(ip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_init, NULL); 391 392 #ifdef VIMAGE 393 static void 394 ip_destroy(void *unused __unused) 395 { 396 int error; 397 398 #ifdef RSS 399 netisr_unregister_vnet(&ip_direct_nh); 400 #endif 401 netisr_unregister_vnet(&ip_nh); 402 403 pfil_head_unregister(V_inet_pfil_head); 404 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]); 405 if (error != 0) { 406 printf("%s: WARNING: unable to deregister input helper hook " 407 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: " 408 "error %d returned\n", __func__, error); 409 } 410 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]); 411 if (error != 0) { 412 printf("%s: WARNING: unable to deregister output helper hook " 413 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: " 414 "error %d returned\n", __func__, error); 415 } 416 417 /* Remove the IPv4 addresses from all interfaces. */ 418 in_ifscrub_all(); 419 420 /* Make sure the IPv4 routes are gone as well. */ 421 rib_flush_routes_family(AF_INET); 422 423 /* Destroy IP reassembly queue. */ 424 ipreass_destroy(); 425 426 /* Cleanup in_ifaddr hash table; should be empty. */ 427 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask); 428 } 429 430 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL); 431 #endif 432 433 #ifdef RSS 434 /* 435 * IP direct input routine. 436 * 437 * This is called when reinjecting completed fragments where 438 * all of the previous checking and book-keeping has been done. 439 */ 440 void 441 ip_direct_input(struct mbuf *m) 442 { 443 struct ip *ip; 444 int hlen; 445 446 ip = mtod(m, struct ip *); 447 hlen = ip->ip_hl << 2; 448 449 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 450 if (IPSEC_ENABLED(ipv4)) { 451 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 452 return; 453 } 454 #endif /* IPSEC */ 455 IPSTAT_INC(ips_delivered); 456 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 457 } 458 #endif 459 460 /* 461 * Ip input routine. Checksum and byte swap header. If fragmented 462 * try to reassemble. Process options. Pass to next level. 463 */ 464 void 465 ip_input(struct mbuf *m) 466 { 467 struct ip *ip = NULL; 468 struct in_ifaddr *ia = NULL; 469 struct ifaddr *ifa; 470 struct ifnet *ifp; 471 int hlen = 0; 472 uint16_t sum, ip_len; 473 int dchg = 0; /* dest changed after fw */ 474 struct in_addr odst; /* original dst address */ 475 bool strong_es; 476 477 M_ASSERTPKTHDR(m); 478 NET_EPOCH_ASSERT(); 479 480 if (m->m_flags & M_FASTFWD_OURS) { 481 m->m_flags &= ~M_FASTFWD_OURS; 482 /* Set up some basics that will be used later. */ 483 ip = mtod(m, struct ip *); 484 hlen = ip->ip_hl << 2; 485 ip_len = ntohs(ip->ip_len); 486 goto ours; 487 } 488 489 IPSTAT_INC(ips_total); 490 491 if (__predict_false(m->m_pkthdr.len < sizeof(struct ip))) 492 goto tooshort; 493 494 if (m->m_len < sizeof(struct ip)) { 495 m = m_pullup(m, sizeof(struct ip)); 496 if (__predict_false(m == NULL)) { 497 IPSTAT_INC(ips_toosmall); 498 return; 499 } 500 } 501 ip = mtod(m, struct ip *); 502 503 if (__predict_false(ip->ip_v != IPVERSION)) { 504 IPSTAT_INC(ips_badvers); 505 goto bad; 506 } 507 508 hlen = ip->ip_hl << 2; 509 if (__predict_false(hlen < sizeof(struct ip))) { /* minimum header length */ 510 IPSTAT_INC(ips_badhlen); 511 goto bad; 512 } 513 if (hlen > m->m_len) { 514 m = m_pullup(m, hlen); 515 if (__predict_false(m == NULL)) { 516 IPSTAT_INC(ips_badhlen); 517 return; 518 } 519 ip = mtod(m, struct ip *); 520 } 521 522 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 523 524 /* IN_LOOPBACK must not appear on the wire - RFC1122 */ 525 ifp = m->m_pkthdr.rcvif; 526 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 527 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 528 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 529 IPSTAT_INC(ips_badaddr); 530 goto bad; 531 } 532 } 533 534 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 535 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 536 } else if (m->m_pkthdr.csum_flags & CSUM_IP) { 537 /* 538 * Packet from local host that offloaded checksum computation. 539 * Checksum not required since the packet wasn't on the wire. 540 */ 541 sum = 0; 542 } else { 543 if (hlen == sizeof(struct ip)) { 544 sum = in_cksum_hdr(ip); 545 } else { 546 sum = in_cksum(m, hlen); 547 } 548 } 549 if (__predict_false(sum)) { 550 IPSTAT_INC(ips_badsum); 551 goto bad; 552 } 553 554 ip_len = ntohs(ip->ip_len); 555 if (__predict_false(ip_len < hlen)) { 556 IPSTAT_INC(ips_badlen); 557 goto bad; 558 } 559 560 /* 561 * Check that the amount of data in the buffers 562 * is as at least much as the IP header would have us expect. 563 * Trim mbufs if longer than we expect. 564 * Drop packet if shorter than we expect. 565 */ 566 if (__predict_false(m->m_pkthdr.len < ip_len)) { 567 tooshort: 568 IPSTAT_INC(ips_tooshort); 569 goto bad; 570 } 571 if (m->m_pkthdr.len > ip_len) { 572 if (m->m_len == m->m_pkthdr.len) { 573 m->m_len = ip_len; 574 m->m_pkthdr.len = ip_len; 575 } else 576 m_adj(m, ip_len - m->m_pkthdr.len); 577 } 578 579 /* 580 * Try to forward the packet, but if we fail continue. 581 * ip_tryforward() may generate redirects these days. 582 * XXX the logic below falling through to normal processing 583 * if redirects are required should be revisited as well. 584 * ip_tryforward() does inbound and outbound packet firewall 585 * processing. If firewall has decided that destination becomes 586 * our local address, it sets M_FASTFWD_OURS flag. In this 587 * case skip another inbound firewall processing and update 588 * ip pointer. 589 */ 590 if (V_ipforwarding != 0 591 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 592 && (!IPSEC_ENABLED(ipv4) || 593 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 594 #endif 595 ) { 596 /* 597 * ip_dooptions() was run so we can ignore the source route (or 598 * any IP options case) case for redirects in ip_tryforward(). 599 */ 600 if ((m = ip_tryforward(m)) == NULL) 601 return; 602 if (m->m_flags & M_FASTFWD_OURS) { 603 m->m_flags &= ~M_FASTFWD_OURS; 604 ip = mtod(m, struct ip *); 605 goto ours; 606 } 607 } 608 609 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 610 /* 611 * Bypass packet filtering for packets previously handled by IPsec. 612 */ 613 if (IPSEC_ENABLED(ipv4) && 614 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 615 goto passin; 616 #endif 617 618 /* 619 * Run through list of hooks for input packets. 620 * 621 * NB: Beware of the destination address changing (e.g. 622 * by NAT rewriting). When this happens, tell 623 * ip_forward to do the right thing. 624 */ 625 626 /* Jump over all PFIL processing if hooks are not active. */ 627 if (!PFIL_HOOKED_IN(V_inet_pfil_head)) 628 goto passin; 629 630 odst = ip->ip_dst; 631 if (pfil_mbuf_in(V_inet_pfil_head, &m, ifp, NULL) != 632 PFIL_PASS) 633 return; 634 635 ip = mtod(m, struct ip *); 636 dchg = (odst.s_addr != ip->ip_dst.s_addr); 637 638 if (m->m_flags & M_FASTFWD_OURS) { 639 m->m_flags &= ~M_FASTFWD_OURS; 640 goto ours; 641 } 642 if (m->m_flags & M_IP_NEXTHOP) { 643 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 644 /* 645 * Directly ship the packet on. This allows 646 * forwarding packets originally destined to us 647 * to some other directly connected host. 648 */ 649 ip_forward(m, 1); 650 return; 651 } 652 } 653 passin: 654 /* 655 * The unspecified address can appear only as a src address - RFC1122. 656 * 657 * The check is deferred to here to give firewalls a chance to block 658 * (and log) such packets. ip_tryforward() will not process such 659 * packets. 660 */ 661 if (__predict_false(ntohl(ip->ip_dst.s_addr) == INADDR_ANY)) { 662 IPSTAT_INC(ips_badaddr); 663 goto bad; 664 } 665 666 /* 667 * Process options and, if not destined for us, 668 * ship it on. ip_dooptions returns 1 when an 669 * error was detected (causing an icmp message 670 * to be sent and the original packet to be freed). 671 */ 672 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 673 return; 674 675 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 676 * matter if it is destined to another node, or whether it is 677 * a multicast one, RSVP wants it! and prevents it from being forwarded 678 * anywhere else. Also checks if the rsvp daemon is running before 679 * grabbing the packet. 680 */ 681 if (ip->ip_p == IPPROTO_RSVP && V_rsvp_on) 682 goto ours; 683 684 /* 685 * Check our list of addresses, to see if the packet is for us. 686 * If we don't have any addresses, assume any unicast packet 687 * we receive might be for us (and let the upper layers deal 688 * with it). 689 */ 690 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) && 691 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 692 goto ours; 693 694 /* 695 * Enable a consistency check between the destination address 696 * and the arrival interface for a unicast packet (the RFC 1122 697 * strong ES model) with a list of additional predicates: 698 * - if IP forwarding is disabled 699 * - the packet is not locally generated 700 * - the packet is not subject to 'ipfw fwd' 701 * - Interface is not running CARP. If the packet got here, we already 702 * checked it with carp_iamatch() and carp_forus(). 703 */ 704 strong_es = V_ip_strong_es && (V_ipforwarding == 0) && 705 ((ifp->if_flags & IFF_LOOPBACK) == 0) && 706 ifp->if_carp == NULL && (dchg == 0); 707 708 /* 709 * Check for exact addresses in the hash bucket. 710 */ 711 CK_LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 712 if (IA_SIN(ia)->sin_addr.s_addr != ip->ip_dst.s_addr) 713 continue; 714 715 /* 716 * net.inet.ip.rfc1122_strong_es: the address matches, verify 717 * that the packet arrived via the correct interface. 718 */ 719 if (__predict_false(strong_es && ia->ia_ifp != ifp)) { 720 IPSTAT_INC(ips_badaddr); 721 goto bad; 722 } 723 724 /* 725 * net.inet.ip.source_address_validation: drop incoming 726 * packets that pretend to be ours. 727 */ 728 if (V_ip_sav && !(ifp->if_flags & IFF_LOOPBACK) && 729 __predict_false(in_localip_fib(ip->ip_src, ifp->if_fib))) { 730 IPSTAT_INC(ips_badaddr); 731 goto bad; 732 } 733 734 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 735 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 736 goto ours; 737 } 738 739 /* 740 * Check for broadcast addresses. 741 * 742 * Only accept broadcast packets that arrive via the matching 743 * interface. Reception of forwarded directed broadcasts would 744 * be handled via ip_forward() and ether_output() with the loopback 745 * into the stack for SIMPLEX interfaces handled by ether_output(). 746 */ 747 if (ifp->if_flags & IFF_BROADCAST) { 748 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 749 if (ifa->ifa_addr->sa_family != AF_INET) 750 continue; 751 ia = ifatoia(ifa); 752 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 753 ip->ip_dst.s_addr) { 754 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 755 counter_u64_add(ia->ia_ifa.ifa_ibytes, 756 m->m_pkthdr.len); 757 goto ours; 758 } 759 #ifdef BOOTP_COMPAT 760 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 761 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 762 counter_u64_add(ia->ia_ifa.ifa_ibytes, 763 m->m_pkthdr.len); 764 goto ours; 765 } 766 #endif 767 } 768 ia = NULL; 769 } 770 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 771 /* 772 * RFC 3927 2.7: Do not forward multicast packets from 773 * IN_LINKLOCAL. 774 */ 775 if (V_ip_mrouting_enabled && 776 !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 777 /* 778 * If we are acting as a multicast router, all 779 * incoming multicast packets are passed to the 780 * kernel-level multicast forwarding function. 781 * The packet is returned (relatively) intact; if 782 * ip_mforward() returns a non-zero value, the packet 783 * must be discarded, else it may be accepted below. 784 */ 785 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 786 IPSTAT_INC(ips_cantforward); 787 m_freem(m); 788 return; 789 } 790 791 /* 792 * The process-level routing daemon needs to receive 793 * all multicast IGMP packets, whether or not this 794 * host belongs to their destination groups. 795 */ 796 if (ip->ip_p == IPPROTO_IGMP) { 797 goto ours; 798 } 799 IPSTAT_INC(ips_forward); 800 } 801 /* 802 * Assume the packet is for us, to avoid prematurely taking 803 * a lock on the in_multi hash. Protocols must perform 804 * their own filtering and update statistics accordingly. 805 */ 806 goto ours; 807 } 808 if (in_broadcast(ip->ip_dst)) 809 goto ours; 810 /* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */ 811 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || 812 IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 813 IPSTAT_INC(ips_cantforward); 814 m_freem(m); 815 return; 816 } 817 818 /* 819 * Not for us; forward if possible and desirable. 820 */ 821 if (V_ipforwarding == 0) { 822 IPSTAT_INC(ips_cantforward); 823 m_freem(m); 824 } else { 825 ip_forward(m, dchg); 826 } 827 return; 828 829 ours: 830 #ifdef IPSTEALTH 831 /* 832 * IPSTEALTH: Process non-routing options only 833 * if the packet is destined for us. 834 */ 835 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 836 return; 837 #endif /* IPSTEALTH */ 838 839 /* 840 * We are going to ship the packet to the local protocol stack. Call the 841 * filter again for this 'output' action, allowing redirect-like rules 842 * to adjust the source address. 843 */ 844 if (PFIL_HOOKED_OUT(V_inet_local_pfil_head)) { 845 if (pfil_mbuf_out(V_inet_local_pfil_head, &m, V_loif, NULL) != 846 PFIL_PASS) 847 return; 848 ip = mtod(m, struct ip *); 849 } 850 851 /* 852 * Attempt reassembly; if it succeeds, proceed. 853 * ip_reass() will return a different mbuf. 854 */ 855 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 856 /* XXXGL: shouldn't we save & set m_flags? */ 857 m = ip_reass(m); 858 if (m == NULL) 859 return; 860 ip = mtod(m, struct ip *); 861 /* Get the header length of the reassembled packet */ 862 hlen = ip->ip_hl << 2; 863 } 864 865 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 866 if (IPSEC_ENABLED(ipv4)) { 867 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 868 return; 869 } 870 #endif /* IPSEC */ 871 872 /* 873 * Switch out to protocol's input routine. 874 */ 875 IPSTAT_INC(ips_delivered); 876 877 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 878 return; 879 bad: 880 m_freem(m); 881 } 882 883 int 884 ipproto_register(uint8_t proto, ipproto_input_t input, ipproto_ctlinput_t ctl) 885 { 886 887 MPASS(proto > 0); 888 889 /* 890 * The protocol slot must not be occupied by another protocol 891 * already. An index pointing to rip_input() is unused. 892 */ 893 if (ip_protox[proto] == rip_input) { 894 ip_protox[proto] = input; 895 ip_ctlprotox[proto] = ctl; 896 return (0); 897 } else 898 return (EEXIST); 899 } 900 901 int 902 ipproto_unregister(uint8_t proto) 903 { 904 905 MPASS(proto > 0); 906 907 if (ip_protox[proto] != rip_input) { 908 ip_protox[proto] = rip_input; 909 ip_ctlprotox[proto] = rip_ctlinput; 910 return (0); 911 } else 912 return (ENOENT); 913 } 914 915 /* 916 * Forward a packet. If some error occurs return the sender 917 * an icmp packet. Note we can't always generate a meaningful 918 * icmp message because icmp doesn't have a large enough repertoire 919 * of codes and types. 920 * 921 * If not forwarding, just drop the packet. This could be confusing 922 * if ipforwarding was zero but some routing protocol was advancing 923 * us as a gateway to somewhere. However, we must let the routing 924 * protocol deal with that. 925 * 926 * The srcrt parameter indicates whether the packet is being forwarded 927 * via a source route. 928 */ 929 void 930 ip_forward(struct mbuf *m, int srcrt) 931 { 932 struct ip *ip = mtod(m, struct ip *); 933 struct in_ifaddr *ia; 934 struct mbuf *mcopy; 935 struct sockaddr_in *sin; 936 struct in_addr dest; 937 struct route ro; 938 uint32_t flowid; 939 int error, type = 0, code = 0, mtu = 0; 940 941 NET_EPOCH_ASSERT(); 942 943 if (m->m_flags & (M_BCAST|M_MCAST) || !in_canforward(ip->ip_dst)) { 944 IPSTAT_INC(ips_cantforward); 945 m_freem(m); 946 return; 947 } 948 if ( 949 #ifdef IPSTEALTH 950 V_ipstealth == 0 && 951 #endif 952 ip->ip_ttl <= IPTTLDEC) { 953 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 954 return; 955 } 956 957 bzero(&ro, sizeof(ro)); 958 sin = (struct sockaddr_in *)&ro.ro_dst; 959 sin->sin_family = AF_INET; 960 sin->sin_len = sizeof(*sin); 961 sin->sin_addr = ip->ip_dst; 962 flowid = m->m_pkthdr.flowid; 963 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 964 if (ro.ro_nh != NULL) { 965 if (ro.ro_nh->nh_flags & (NHF_BLACKHOLE | NHF_BROADCAST)) { 966 IPSTAT_INC(ips_cantforward); 967 m_freem(m); 968 NH_FREE(ro.ro_nh); 969 return; 970 } 971 if (ro.ro_nh->nh_flags & NHF_REJECT) { 972 IPSTAT_INC(ips_cantforward); 973 NH_FREE(ro.ro_nh); 974 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 975 return; 976 } 977 ia = ifatoia(ro.ro_nh->nh_ifa); 978 } else 979 ia = NULL; 980 /* 981 * Save the IP header and at most 8 bytes of the payload, 982 * in case we need to generate an ICMP message to the src. 983 * 984 * XXX this can be optimized a lot by saving the data in a local 985 * buffer on the stack (72 bytes at most), and only allocating the 986 * mbuf if really necessary. The vast majority of the packets 987 * are forwarded without having to send an ICMP back (either 988 * because unnecessary, or because rate limited), so we are 989 * really we are wasting a lot of work here. 990 * 991 * We don't use m_copym() because it might return a reference 992 * to a shared cluster. Both this function and ip_output() 993 * assume exclusive access to the IP header in `m', so any 994 * data in a cluster may change before we reach icmp_error(). 995 */ 996 mcopy = m_gethdr(M_NOWAIT, m->m_type); 997 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 998 /* 999 * It's probably ok if the pkthdr dup fails (because 1000 * the deep copy of the tag chain failed), but for now 1001 * be conservative and just discard the copy since 1002 * code below may some day want the tags. 1003 */ 1004 m_free(mcopy); 1005 mcopy = NULL; 1006 } 1007 if (mcopy != NULL) { 1008 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 1009 mcopy->m_pkthdr.len = mcopy->m_len; 1010 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 1011 } 1012 #ifdef IPSTEALTH 1013 if (V_ipstealth == 0) 1014 #endif 1015 ip->ip_ttl -= IPTTLDEC; 1016 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1017 if (IPSEC_ENABLED(ipv4)) { 1018 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 1019 /* mbuf consumed by IPsec */ 1020 RO_NHFREE(&ro); 1021 m_freem(mcopy); 1022 if (error != EINPROGRESS) 1023 IPSTAT_INC(ips_cantforward); 1024 return; 1025 } 1026 /* No IPsec processing required */ 1027 } 1028 #endif /* IPSEC */ 1029 /* 1030 * If forwarding packet using same interface that it came in on, 1031 * perhaps should send a redirect to sender to shortcut a hop. 1032 * Only send redirect if source is sending directly to us, 1033 * and if packet was not source routed (or has any options). 1034 * Also, don't send redirect if forwarding using a default route 1035 * or a route modified by a redirect. 1036 */ 1037 dest.s_addr = 0; 1038 if (!srcrt && V_ipsendredirects && 1039 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1040 struct nhop_object *nh; 1041 1042 nh = ro.ro_nh; 1043 1044 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1045 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1046 u_long src = ntohl(ip->ip_src.s_addr); 1047 1048 if (nh_ia != NULL && 1049 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1050 /* Router requirements says to only send host redirects */ 1051 type = ICMP_REDIRECT; 1052 code = ICMP_REDIRECT_HOST; 1053 if (nh->nh_flags & NHF_GATEWAY) { 1054 if (nh->gw_sa.sa_family == AF_INET) 1055 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1056 else /* Do not redirect in case gw is AF_INET6 */ 1057 type = 0; 1058 } else 1059 dest.s_addr = ip->ip_dst.s_addr; 1060 } 1061 } 1062 } 1063 1064 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1065 1066 if (error == EMSGSIZE && ro.ro_nh) 1067 mtu = ro.ro_nh->nh_mtu; 1068 RO_NHFREE(&ro); 1069 1070 if (error) 1071 IPSTAT_INC(ips_cantforward); 1072 else { 1073 IPSTAT_INC(ips_forward); 1074 if (type) 1075 IPSTAT_INC(ips_redirectsent); 1076 else { 1077 if (mcopy) 1078 m_freem(mcopy); 1079 return; 1080 } 1081 } 1082 if (mcopy == NULL) 1083 return; 1084 1085 switch (error) { 1086 case 0: /* forwarded, but need redirect */ 1087 /* type, code set above */ 1088 break; 1089 1090 case ENETUNREACH: 1091 case EHOSTUNREACH: 1092 case ENETDOWN: 1093 case EHOSTDOWN: 1094 default: 1095 type = ICMP_UNREACH; 1096 code = ICMP_UNREACH_HOST; 1097 break; 1098 1099 case EMSGSIZE: 1100 type = ICMP_UNREACH; 1101 code = ICMP_UNREACH_NEEDFRAG; 1102 /* 1103 * If the MTU was set before make sure we are below the 1104 * interface MTU. 1105 * If the MTU wasn't set before use the interface mtu or 1106 * fall back to the next smaller mtu step compared to the 1107 * current packet size. 1108 */ 1109 if (mtu != 0) { 1110 if (ia != NULL) 1111 mtu = min(mtu, ia->ia_ifp->if_mtu); 1112 } else { 1113 if (ia != NULL) 1114 mtu = ia->ia_ifp->if_mtu; 1115 else 1116 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1117 } 1118 IPSTAT_INC(ips_cantfrag); 1119 break; 1120 1121 case ENOBUFS: 1122 case EACCES: /* ipfw denied packet */ 1123 m_freem(mcopy); 1124 return; 1125 } 1126 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1127 } 1128 1129 #define CHECK_SO_CT(sp, ct) \ 1130 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1131 1132 void 1133 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1134 struct mbuf *m) 1135 { 1136 bool stamped; 1137 1138 stamped = false; 1139 if ((inp->inp_socket->so_options & SO_BINTIME) || 1140 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1141 struct bintime boottimebin, bt; 1142 struct timespec ts1; 1143 1144 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1145 M_TSTMP)) { 1146 mbuf_tstmp2timespec(m, &ts1); 1147 timespec2bintime(&ts1, &bt); 1148 getboottimebin(&boottimebin); 1149 bintime_add(&bt, &boottimebin); 1150 } else { 1151 bintime(&bt); 1152 } 1153 *mp = sbcreatecontrol(&bt, sizeof(bt), SCM_BINTIME, 1154 SOL_SOCKET, M_NOWAIT); 1155 if (*mp != NULL) { 1156 mp = &(*mp)->m_next; 1157 stamped = true; 1158 } 1159 } 1160 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1161 struct bintime boottimebin, bt1; 1162 struct timespec ts1; 1163 struct timeval tv; 1164 1165 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1166 M_TSTMP)) { 1167 mbuf_tstmp2timespec(m, &ts1); 1168 timespec2bintime(&ts1, &bt1); 1169 getboottimebin(&boottimebin); 1170 bintime_add(&bt1, &boottimebin); 1171 bintime2timeval(&bt1, &tv); 1172 } else { 1173 microtime(&tv); 1174 } 1175 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, 1176 SOL_SOCKET, M_NOWAIT); 1177 if (*mp != NULL) { 1178 mp = &(*mp)->m_next; 1179 stamped = true; 1180 } 1181 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1182 struct bintime boottimebin; 1183 struct timespec ts, ts1; 1184 1185 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1186 M_TSTMP)) { 1187 mbuf_tstmp2timespec(m, &ts); 1188 getboottimebin(&boottimebin); 1189 bintime2timespec(&boottimebin, &ts1); 1190 timespecadd(&ts, &ts1, &ts); 1191 } else { 1192 nanotime(&ts); 1193 } 1194 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_REALTIME, 1195 SOL_SOCKET, M_NOWAIT); 1196 if (*mp != NULL) { 1197 mp = &(*mp)->m_next; 1198 stamped = true; 1199 } 1200 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1201 struct timespec ts; 1202 1203 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1204 M_TSTMP)) 1205 mbuf_tstmp2timespec(m, &ts); 1206 else 1207 nanouptime(&ts); 1208 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_MONOTONIC, 1209 SOL_SOCKET, M_NOWAIT); 1210 if (*mp != NULL) { 1211 mp = &(*mp)->m_next; 1212 stamped = true; 1213 } 1214 } 1215 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1216 M_TSTMP)) { 1217 struct sock_timestamp_info sti; 1218 1219 bzero(&sti, sizeof(sti)); 1220 sti.st_info_flags = ST_INFO_HW; 1221 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1222 sti.st_info_flags |= ST_INFO_HW_HPREC; 1223 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1224 SOL_SOCKET, M_NOWAIT); 1225 if (*mp != NULL) 1226 mp = &(*mp)->m_next; 1227 } 1228 if (inp->inp_flags & INP_RECVDSTADDR) { 1229 *mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr), 1230 IP_RECVDSTADDR, IPPROTO_IP, M_NOWAIT); 1231 if (*mp) 1232 mp = &(*mp)->m_next; 1233 } 1234 if (inp->inp_flags & INP_RECVTTL) { 1235 *mp = sbcreatecontrol(&ip->ip_ttl, sizeof(u_char), IP_RECVTTL, 1236 IPPROTO_IP, M_NOWAIT); 1237 if (*mp) 1238 mp = &(*mp)->m_next; 1239 } 1240 #ifdef notyet 1241 /* XXX 1242 * Moving these out of udp_input() made them even more broken 1243 * than they already were. 1244 */ 1245 /* options were tossed already */ 1246 if (inp->inp_flags & INP_RECVOPTS) { 1247 *mp = sbcreatecontrol(opts_deleted_above, 1248 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, M_NOWAIT); 1249 if (*mp) 1250 mp = &(*mp)->m_next; 1251 } 1252 /* ip_srcroute doesn't do what we want here, need to fix */ 1253 if (inp->inp_flags & INP_RECVRETOPTS) { 1254 *mp = sbcreatecontrol(ip_srcroute(m), sizeof(struct in_addr), 1255 IP_RECVRETOPTS, IPPROTO_IP, M_NOWAIT); 1256 if (*mp) 1257 mp = &(*mp)->m_next; 1258 } 1259 #endif 1260 if (inp->inp_flags & INP_RECVIF) { 1261 struct ifnet *ifp; 1262 struct sdlbuf { 1263 struct sockaddr_dl sdl; 1264 u_char pad[32]; 1265 } sdlbuf; 1266 struct sockaddr_dl *sdp; 1267 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1268 1269 if ((ifp = m->m_pkthdr.rcvif)) { 1270 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1271 /* 1272 * Change our mind and don't try copy. 1273 */ 1274 if (sdp->sdl_family != AF_LINK || 1275 sdp->sdl_len > sizeof(sdlbuf)) { 1276 goto makedummy; 1277 } 1278 bcopy(sdp, sdl2, sdp->sdl_len); 1279 } else { 1280 makedummy: 1281 sdl2->sdl_len = 1282 offsetof(struct sockaddr_dl, sdl_data[0]); 1283 sdl2->sdl_family = AF_LINK; 1284 sdl2->sdl_index = 0; 1285 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1286 } 1287 *mp = sbcreatecontrol(sdl2, sdl2->sdl_len, IP_RECVIF, 1288 IPPROTO_IP, M_NOWAIT); 1289 if (*mp) 1290 mp = &(*mp)->m_next; 1291 } 1292 if (inp->inp_flags & INP_RECVTOS) { 1293 *mp = sbcreatecontrol(&ip->ip_tos, sizeof(u_char), IP_RECVTOS, 1294 IPPROTO_IP, M_NOWAIT); 1295 if (*mp) 1296 mp = &(*mp)->m_next; 1297 } 1298 1299 if (inp->inp_flags2 & INP_RECVFLOWID) { 1300 uint32_t flowid, flow_type; 1301 1302 flowid = m->m_pkthdr.flowid; 1303 flow_type = M_HASHTYPE_GET(m); 1304 1305 /* 1306 * XXX should handle the failure of one or the 1307 * other - don't populate both? 1308 */ 1309 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IP_FLOWID, 1310 IPPROTO_IP, M_NOWAIT); 1311 if (*mp) 1312 mp = &(*mp)->m_next; 1313 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1314 IP_FLOWTYPE, IPPROTO_IP, M_NOWAIT); 1315 if (*mp) 1316 mp = &(*mp)->m_next; 1317 } 1318 1319 #ifdef RSS 1320 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1321 uint32_t flowid, flow_type; 1322 uint32_t rss_bucketid; 1323 1324 flowid = m->m_pkthdr.flowid; 1325 flow_type = M_HASHTYPE_GET(m); 1326 1327 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1328 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1329 IP_RSSBUCKETID, IPPROTO_IP, M_NOWAIT); 1330 if (*mp) 1331 mp = &(*mp)->m_next; 1332 } 1333 } 1334 #endif 1335 } 1336 1337 /* 1338 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1339 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1340 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1341 * compiled. 1342 */ 1343 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1344 VNET_DEFINE(struct socket *, ip_rsvpd); 1345 1346 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1347 1348 int 1349 ip_rsvp_init(struct socket *so) 1350 { 1351 1352 if (V_ip_rsvpd != NULL) 1353 return EADDRINUSE; 1354 1355 V_ip_rsvpd = so; 1356 /* 1357 * This may seem silly, but we need to be sure we don't over-increment 1358 * the RSVP counter, in case something slips up. 1359 */ 1360 if (!V_ip_rsvp_on) { 1361 V_ip_rsvp_on = 1; 1362 V_rsvp_on++; 1363 } 1364 1365 return 0; 1366 } 1367 1368 int 1369 ip_rsvp_done(void) 1370 { 1371 1372 V_ip_rsvpd = NULL; 1373 /* 1374 * This may seem silly, but we need to be sure we don't over-decrement 1375 * the RSVP counter, in case something slips up. 1376 */ 1377 if (V_ip_rsvp_on) { 1378 V_ip_rsvp_on = 0; 1379 V_rsvp_on--; 1380 } 1381 return 0; 1382 } 1383 1384 int 1385 rsvp_input(struct mbuf **mp, int *offp, int proto) 1386 { 1387 struct mbuf *m; 1388 1389 m = *mp; 1390 *mp = NULL; 1391 1392 if (rsvp_input_p) { /* call the real one if loaded */ 1393 *mp = m; 1394 rsvp_input_p(mp, offp, proto); 1395 return (IPPROTO_DONE); 1396 } 1397 1398 /* Can still get packets with rsvp_on = 0 if there is a local member 1399 * of the group to which the RSVP packet is addressed. But in this 1400 * case we want to throw the packet away. 1401 */ 1402 1403 if (!V_rsvp_on) { 1404 m_freem(m); 1405 return (IPPROTO_DONE); 1406 } 1407 1408 if (V_ip_rsvpd != NULL) { 1409 *mp = m; 1410 rip_input(mp, offp, proto); 1411 return (IPPROTO_DONE); 1412 } 1413 /* Drop the packet */ 1414 m_freem(m); 1415 return (IPPROTO_DONE); 1416 } 1417