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 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_bootp.h" 38 #include "opt_ipstealth.h" 39 #include "opt_ipsec.h" 40 #include "opt_route.h" 41 #include "opt_rss.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/hhook.h> 46 #include <sys/mbuf.h> 47 #include <sys/malloc.h> 48 #include <sys/domain.h> 49 #include <sys/protosw.h> 50 #include <sys/socket.h> 51 #include <sys/time.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/rmlock.h> 55 #include <sys/rwlock.h> 56 #include <sys/sdt.h> 57 #include <sys/syslog.h> 58 #include <sys/sysctl.h> 59 60 #include <net/if.h> 61 #include <net/if_types.h> 62 #include <net/if_var.h> 63 #include <net/if_dl.h> 64 #include <net/pfil.h> 65 #include <net/route.h> 66 #include <net/route/nhop.h> 67 #include <net/netisr.h> 68 #include <net/rss_config.h> 69 #include <net/vnet.h> 70 71 #include <netinet/in.h> 72 #include <netinet/in_kdtrace.h> 73 #include <netinet/in_systm.h> 74 #include <netinet/in_var.h> 75 #include <netinet/ip.h> 76 #include <netinet/in_fib.h> 77 #include <netinet/in_pcb.h> 78 #include <netinet/ip_var.h> 79 #include <netinet/ip_fw.h> 80 #include <netinet/ip_icmp.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 86 #include <netipsec/ipsec_support.h> 87 88 #include <sys/socketvar.h> 89 90 #include <security/mac/mac_framework.h> 91 92 #ifdef CTASSERT 93 CTASSERT(sizeof(struct ip) == 20); 94 #endif 95 96 /* IP reassembly functions are defined in ip_reass.c. */ 97 extern void ipreass_init(void); 98 extern void ipreass_drain(void); 99 extern void ipreass_slowtimo(void); 100 #ifdef VIMAGE 101 extern void ipreass_destroy(void); 102 #endif 103 104 struct rmlock in_ifaddr_lock; 105 RM_SYSINIT(in_ifaddr_lock, &in_ifaddr_lock, "in_ifaddr_lock"); 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 /* 124 * XXX - Setting ip_checkinterface mostly implements the receive side of 125 * the Strong ES model described in RFC 1122, but since the routing table 126 * and transmit implementation do not implement the Strong ES model, 127 * setting this to 1 results in an odd hybrid. 128 * 129 * XXX - ip_checkinterface currently must be disabled if you use ipnat 130 * to translate the destination address to another local interface. 131 * 132 * XXX - ip_checkinterface must be disabled if you add IP aliases 133 * to the loopback interface instead of the interface where the 134 * packets for those addresses are received. 135 */ 136 VNET_DEFINE_STATIC(int, ip_checkinterface); 137 #define V_ip_checkinterface VNET(ip_checkinterface) 138 SYSCTL_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_VNET | CTLFLAG_RW, 139 &VNET_NAME(ip_checkinterface), 0, 140 "Verify packet arrives on correct interface"); 141 142 VNET_DEFINE(pfil_head_t, inet_pfil_head); /* Packet filter hooks */ 143 144 static struct netisr_handler ip_nh = { 145 .nh_name = "ip", 146 .nh_handler = ip_input, 147 .nh_proto = NETISR_IP, 148 #ifdef RSS 149 .nh_m2cpuid = rss_soft_m2cpuid_v4, 150 .nh_policy = NETISR_POLICY_CPU, 151 .nh_dispatch = NETISR_DISPATCH_HYBRID, 152 #else 153 .nh_policy = NETISR_POLICY_FLOW, 154 #endif 155 }; 156 157 #ifdef RSS 158 /* 159 * Directly dispatched frames are currently assumed 160 * to have a flowid already calculated. 161 * 162 * It should likely have something that assert it 163 * actually has valid flow details. 164 */ 165 static struct netisr_handler ip_direct_nh = { 166 .nh_name = "ip_direct", 167 .nh_handler = ip_direct_input, 168 .nh_proto = NETISR_IP_DIRECT, 169 .nh_m2cpuid = rss_soft_m2cpuid_v4, 170 .nh_policy = NETISR_POLICY_CPU, 171 .nh_dispatch = NETISR_DISPATCH_HYBRID, 172 }; 173 #endif 174 175 extern struct domain inetdomain; 176 extern struct protosw inetsw[]; 177 u_char ip_protox[IPPROTO_MAX]; 178 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */ 179 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */ 180 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */ 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 void 311 ip_init(void) 312 { 313 struct pfil_head_args args; 314 struct protosw *pr; 315 int i; 316 317 CK_STAILQ_INIT(&V_in_ifaddrhead); 318 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask); 319 320 /* Initialize IP reassembly queue. */ 321 ipreass_init(); 322 323 /* Initialize packet filter hooks. */ 324 args.pa_version = PFIL_VERSION; 325 args.pa_flags = PFIL_IN | PFIL_OUT; 326 args.pa_type = PFIL_TYPE_IP4; 327 args.pa_headname = PFIL_INET_NAME; 328 V_inet_pfil_head = pfil_head_register(&args); 329 330 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET, 331 &V_ipsec_hhh_in[HHOOK_IPSEC_INET], 332 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 333 printf("%s: WARNING: unable to register input helper hook\n", 334 __func__); 335 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET, 336 &V_ipsec_hhh_out[HHOOK_IPSEC_INET], 337 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 338 printf("%s: WARNING: unable to register output helper hook\n", 339 __func__); 340 341 /* Skip initialization of globals for non-default instances. */ 342 #ifdef VIMAGE 343 if (!IS_DEFAULT_VNET(curvnet)) { 344 netisr_register_vnet(&ip_nh); 345 #ifdef RSS 346 netisr_register_vnet(&ip_direct_nh); 347 #endif 348 return; 349 } 350 #endif 351 352 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 353 if (pr == NULL) 354 panic("ip_init: PF_INET not found"); 355 356 /* Initialize the entire ip_protox[] array to IPPROTO_RAW. */ 357 for (i = 0; i < IPPROTO_MAX; i++) 358 ip_protox[i] = pr - inetsw; 359 /* 360 * Cycle through IP protocols and put them into the appropriate place 361 * in ip_protox[]. 362 */ 363 for (pr = inetdomain.dom_protosw; 364 pr < inetdomain.dom_protoswNPROTOSW; pr++) 365 if (pr->pr_domain->dom_family == PF_INET && 366 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 367 /* Be careful to only index valid IP protocols. */ 368 if (pr->pr_protocol < IPPROTO_MAX) 369 ip_protox[pr->pr_protocol] = pr - inetsw; 370 } 371 372 netisr_register(&ip_nh); 373 #ifdef RSS 374 netisr_register(&ip_direct_nh); 375 #endif 376 } 377 378 #ifdef VIMAGE 379 static void 380 ip_destroy(void *unused __unused) 381 { 382 int error; 383 384 #ifdef RSS 385 netisr_unregister_vnet(&ip_direct_nh); 386 #endif 387 netisr_unregister_vnet(&ip_nh); 388 389 pfil_head_unregister(V_inet_pfil_head); 390 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]); 391 if (error != 0) { 392 printf("%s: WARNING: unable to deregister input helper hook " 393 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: " 394 "error %d returned\n", __func__, error); 395 } 396 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]); 397 if (error != 0) { 398 printf("%s: WARNING: unable to deregister output helper hook " 399 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: " 400 "error %d returned\n", __func__, error); 401 } 402 403 /* Remove the IPv4 addresses from all interfaces. */ 404 in_ifscrub_all(); 405 406 /* Make sure the IPv4 routes are gone as well. */ 407 rib_flush_routes_family(AF_INET); 408 409 /* Destroy IP reassembly queue. */ 410 ipreass_destroy(); 411 412 /* Cleanup in_ifaddr hash table; should be empty. */ 413 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask); 414 } 415 416 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL); 417 #endif 418 419 #ifdef RSS 420 /* 421 * IP direct input routine. 422 * 423 * This is called when reinjecting completed fragments where 424 * all of the previous checking and book-keeping has been done. 425 */ 426 void 427 ip_direct_input(struct mbuf *m) 428 { 429 struct ip *ip; 430 int hlen; 431 432 ip = mtod(m, struct ip *); 433 hlen = ip->ip_hl << 2; 434 435 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 436 if (IPSEC_ENABLED(ipv4)) { 437 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 438 return; 439 } 440 #endif /* IPSEC */ 441 IPSTAT_INC(ips_delivered); 442 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p); 443 return; 444 } 445 #endif 446 447 /* 448 * Ip input routine. Checksum and byte swap header. If fragmented 449 * try to reassemble. Process options. Pass to next level. 450 */ 451 void 452 ip_input(struct mbuf *m) 453 { 454 struct rm_priotracker in_ifa_tracker; 455 struct ip *ip = NULL; 456 struct in_ifaddr *ia = NULL; 457 struct ifaddr *ifa; 458 struct ifnet *ifp; 459 int checkif, hlen = 0; 460 uint16_t sum, ip_len; 461 int dchg = 0; /* dest changed after fw */ 462 struct in_addr odst; /* original dst address */ 463 464 M_ASSERTPKTHDR(m); 465 NET_EPOCH_ASSERT(); 466 467 if (m->m_flags & M_FASTFWD_OURS) { 468 m->m_flags &= ~M_FASTFWD_OURS; 469 /* Set up some basics that will be used later. */ 470 ip = mtod(m, struct ip *); 471 hlen = ip->ip_hl << 2; 472 ip_len = ntohs(ip->ip_len); 473 goto ours; 474 } 475 476 IPSTAT_INC(ips_total); 477 478 if (m->m_pkthdr.len < sizeof(struct ip)) 479 goto tooshort; 480 481 if (m->m_len < sizeof (struct ip) && 482 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 483 IPSTAT_INC(ips_toosmall); 484 return; 485 } 486 ip = mtod(m, struct ip *); 487 488 if (ip->ip_v != IPVERSION) { 489 IPSTAT_INC(ips_badvers); 490 goto bad; 491 } 492 493 hlen = ip->ip_hl << 2; 494 if (hlen < sizeof(struct ip)) { /* minimum header length */ 495 IPSTAT_INC(ips_badhlen); 496 goto bad; 497 } 498 if (hlen > m->m_len) { 499 if ((m = m_pullup(m, hlen)) == NULL) { 500 IPSTAT_INC(ips_badhlen); 501 return; 502 } 503 ip = mtod(m, struct ip *); 504 } 505 506 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 507 508 /* IN_LOOPBACK must not appear on the wire - RFC1122 */ 509 ifp = m->m_pkthdr.rcvif; 510 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 511 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 512 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 513 IPSTAT_INC(ips_badaddr); 514 goto bad; 515 } 516 } 517 518 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 519 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 520 } else { 521 if (hlen == sizeof(struct ip)) { 522 sum = in_cksum_hdr(ip); 523 } else { 524 sum = in_cksum(m, hlen); 525 } 526 } 527 if (sum) { 528 IPSTAT_INC(ips_badsum); 529 goto bad; 530 } 531 532 #ifdef ALTQ 533 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) 534 /* packet is dropped by traffic conditioner */ 535 return; 536 #endif 537 538 ip_len = ntohs(ip->ip_len); 539 if (ip_len < hlen) { 540 IPSTAT_INC(ips_badlen); 541 goto bad; 542 } 543 544 /* 545 * Check that the amount of data in the buffers 546 * is as at least much as the IP header would have us expect. 547 * Trim mbufs if longer than we expect. 548 * Drop packet if shorter than we expect. 549 */ 550 if (m->m_pkthdr.len < ip_len) { 551 tooshort: 552 IPSTAT_INC(ips_tooshort); 553 goto bad; 554 } 555 if (m->m_pkthdr.len > ip_len) { 556 if (m->m_len == m->m_pkthdr.len) { 557 m->m_len = ip_len; 558 m->m_pkthdr.len = ip_len; 559 } else 560 m_adj(m, ip_len - m->m_pkthdr.len); 561 } 562 563 /* 564 * Try to forward the packet, but if we fail continue. 565 * ip_tryforward() may generate redirects these days. 566 * XXX the logic below falling through to normal processing 567 * if redirects are required should be revisited as well. 568 * ip_tryforward() does inbound and outbound packet firewall 569 * processing. If firewall has decided that destination becomes 570 * our local address, it sets M_FASTFWD_OURS flag. In this 571 * case skip another inbound firewall processing and update 572 * ip pointer. 573 */ 574 if (V_ipforwarding != 0 575 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 576 && (!IPSEC_ENABLED(ipv4) || 577 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 578 #endif 579 ) { 580 /* 581 * ip_dooptions() was run so we can ignore the source route (or 582 * any IP options case) case for redirects in ip_tryforward(). 583 */ 584 if ((m = ip_tryforward(m)) == NULL) 585 return; 586 if (m->m_flags & M_FASTFWD_OURS) { 587 m->m_flags &= ~M_FASTFWD_OURS; 588 ip = mtod(m, struct ip *); 589 goto ours; 590 } 591 } 592 593 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 594 /* 595 * Bypass packet filtering for packets previously handled by IPsec. 596 */ 597 if (IPSEC_ENABLED(ipv4) && 598 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 599 goto passin; 600 #endif 601 602 /* 603 * Run through list of hooks for input packets. 604 * 605 * NB: Beware of the destination address changing (e.g. 606 * by NAT rewriting). When this happens, tell 607 * ip_forward to do the right thing. 608 */ 609 610 /* Jump over all PFIL processing if hooks are not active. */ 611 if (!PFIL_HOOKED_IN(V_inet_pfil_head)) 612 goto passin; 613 614 odst = ip->ip_dst; 615 if (pfil_run_hooks(V_inet_pfil_head, &m, ifp, PFIL_IN, NULL) != 616 PFIL_PASS) 617 return; 618 if (m == NULL) /* consumed by filter */ 619 return; 620 621 ip = mtod(m, struct ip *); 622 dchg = (odst.s_addr != ip->ip_dst.s_addr); 623 ifp = m->m_pkthdr.rcvif; 624 625 if (m->m_flags & M_FASTFWD_OURS) { 626 m->m_flags &= ~M_FASTFWD_OURS; 627 goto ours; 628 } 629 if (m->m_flags & M_IP_NEXTHOP) { 630 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 631 /* 632 * Directly ship the packet on. This allows 633 * forwarding packets originally destined to us 634 * to some other directly connected host. 635 */ 636 ip_forward(m, 1); 637 return; 638 } 639 } 640 passin: 641 642 /* 643 * Process options and, if not destined for us, 644 * ship it on. ip_dooptions returns 1 when an 645 * error was detected (causing an icmp message 646 * to be sent and the original packet to be freed). 647 */ 648 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 649 return; 650 651 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 652 * matter if it is destined to another node, or whether it is 653 * a multicast one, RSVP wants it! and prevents it from being forwarded 654 * anywhere else. Also checks if the rsvp daemon is running before 655 * grabbing the packet. 656 */ 657 if (V_rsvp_on && ip->ip_p==IPPROTO_RSVP) 658 goto ours; 659 660 /* 661 * Check our list of addresses, to see if the packet is for us. 662 * If we don't have any addresses, assume any unicast packet 663 * we receive might be for us (and let the upper layers deal 664 * with it). 665 */ 666 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) && 667 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 668 goto ours; 669 670 /* 671 * Enable a consistency check between the destination address 672 * and the arrival interface for a unicast packet (the RFC 1122 673 * strong ES model) if IP forwarding is disabled and the packet 674 * is not locally generated and the packet is not subject to 675 * 'ipfw fwd'. 676 * 677 * XXX - Checking also should be disabled if the destination 678 * address is ipnat'ed to a different interface. 679 * 680 * XXX - Checking is incompatible with IP aliases added 681 * to the loopback interface instead of the interface where 682 * the packets are received. 683 * 684 * XXX - This is the case for carp vhost IPs as well so we 685 * insert a workaround. If the packet got here, we already 686 * checked with carp_iamatch() and carp_forus(). 687 */ 688 checkif = V_ip_checkinterface && (V_ipforwarding == 0) && 689 ifp != NULL && ((ifp->if_flags & IFF_LOOPBACK) == 0) && 690 ifp->if_carp == NULL && (dchg == 0); 691 692 /* 693 * Check for exact addresses in the hash bucket. 694 */ 695 IN_IFADDR_RLOCK(&in_ifa_tracker); 696 LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 697 /* 698 * If the address matches, verify that the packet 699 * arrived via the correct interface if checking is 700 * enabled. 701 */ 702 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr && 703 (!checkif || ia->ia_ifp == ifp)) { 704 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 705 counter_u64_add(ia->ia_ifa.ifa_ibytes, 706 m->m_pkthdr.len); 707 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 708 goto ours; 709 } 710 } 711 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 712 713 /* 714 * Check for broadcast addresses. 715 * 716 * Only accept broadcast packets that arrive via the matching 717 * interface. Reception of forwarded directed broadcasts would 718 * be handled via ip_forward() and ether_output() with the loopback 719 * into the stack for SIMPLEX interfaces handled by ether_output(). 720 */ 721 if (ifp != NULL && ifp->if_flags & IFF_BROADCAST) { 722 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 723 if (ifa->ifa_addr->sa_family != AF_INET) 724 continue; 725 ia = ifatoia(ifa); 726 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 727 ip->ip_dst.s_addr) { 728 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 729 counter_u64_add(ia->ia_ifa.ifa_ibytes, 730 m->m_pkthdr.len); 731 goto ours; 732 } 733 #ifdef BOOTP_COMPAT 734 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 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 #endif 741 } 742 ia = NULL; 743 } 744 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 745 /* 746 * RFC 3927 2.7: Do not forward multicast packets from 747 * IN_LINKLOCAL. 748 */ 749 if (V_ip_mrouter && !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 750 /* 751 * If we are acting as a multicast router, all 752 * incoming multicast packets are passed to the 753 * kernel-level multicast forwarding function. 754 * The packet is returned (relatively) intact; if 755 * ip_mforward() returns a non-zero value, the packet 756 * must be discarded, else it may be accepted below. 757 */ 758 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 759 IPSTAT_INC(ips_cantforward); 760 m_freem(m); 761 return; 762 } 763 764 /* 765 * The process-level routing daemon needs to receive 766 * all multicast IGMP packets, whether or not this 767 * host belongs to their destination groups. 768 */ 769 if (ip->ip_p == IPPROTO_IGMP) 770 goto ours; 771 IPSTAT_INC(ips_forward); 772 } 773 /* 774 * Assume the packet is for us, to avoid prematurely taking 775 * a lock on the in_multi hash. Protocols must perform 776 * their own filtering and update statistics accordingly. 777 */ 778 goto ours; 779 } 780 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 781 goto ours; 782 if (ip->ip_dst.s_addr == INADDR_ANY) 783 goto ours; 784 /* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */ 785 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || 786 IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 787 IPSTAT_INC(ips_cantforward); 788 m_freem(m); 789 return; 790 } 791 792 /* 793 * Not for us; forward if possible and desirable. 794 */ 795 if (V_ipforwarding == 0) { 796 IPSTAT_INC(ips_cantforward); 797 m_freem(m); 798 } else { 799 ip_forward(m, dchg); 800 } 801 return; 802 803 ours: 804 #ifdef IPSTEALTH 805 /* 806 * IPSTEALTH: Process non-routing options only 807 * if the packet is destined for us. 808 */ 809 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 810 return; 811 #endif /* IPSTEALTH */ 812 813 /* 814 * Attempt reassembly; if it succeeds, proceed. 815 * ip_reass() will return a different mbuf. 816 */ 817 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 818 /* XXXGL: shouldn't we save & set m_flags? */ 819 m = ip_reass(m); 820 if (m == NULL) 821 return; 822 ip = mtod(m, struct ip *); 823 /* Get the header length of the reassembled packet */ 824 hlen = ip->ip_hl << 2; 825 } 826 827 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 828 if (IPSEC_ENABLED(ipv4)) { 829 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 830 return; 831 } 832 #endif /* IPSEC */ 833 834 /* 835 * Switch out to protocol's input routine. 836 */ 837 IPSTAT_INC(ips_delivered); 838 839 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p); 840 return; 841 bad: 842 m_freem(m); 843 } 844 845 /* 846 * IP timer processing; 847 * if a timer expires on a reassembly 848 * queue, discard it. 849 */ 850 void 851 ip_slowtimo(void) 852 { 853 VNET_ITERATOR_DECL(vnet_iter); 854 855 VNET_LIST_RLOCK_NOSLEEP(); 856 VNET_FOREACH(vnet_iter) { 857 CURVNET_SET(vnet_iter); 858 ipreass_slowtimo(); 859 CURVNET_RESTORE(); 860 } 861 VNET_LIST_RUNLOCK_NOSLEEP(); 862 } 863 864 void 865 ip_drain(void) 866 { 867 VNET_ITERATOR_DECL(vnet_iter); 868 869 VNET_LIST_RLOCK_NOSLEEP(); 870 VNET_FOREACH(vnet_iter) { 871 CURVNET_SET(vnet_iter); 872 ipreass_drain(); 873 CURVNET_RESTORE(); 874 } 875 VNET_LIST_RUNLOCK_NOSLEEP(); 876 } 877 878 /* 879 * The protocol to be inserted into ip_protox[] must be already registered 880 * in inetsw[], either statically or through pf_proto_register(). 881 */ 882 int 883 ipproto_register(short ipproto) 884 { 885 struct protosw *pr; 886 887 /* Sanity checks. */ 888 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 889 return (EPROTONOSUPPORT); 890 891 /* 892 * The protocol slot must not be occupied by another protocol 893 * already. An index pointing to IPPROTO_RAW is unused. 894 */ 895 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 896 if (pr == NULL) 897 return (EPFNOSUPPORT); 898 if (ip_protox[ipproto] != pr - inetsw) /* IPPROTO_RAW */ 899 return (EEXIST); 900 901 /* Find the protocol position in inetsw[] and set the index. */ 902 for (pr = inetdomain.dom_protosw; 903 pr < inetdomain.dom_protoswNPROTOSW; pr++) { 904 if (pr->pr_domain->dom_family == PF_INET && 905 pr->pr_protocol && pr->pr_protocol == ipproto) { 906 ip_protox[pr->pr_protocol] = pr - inetsw; 907 return (0); 908 } 909 } 910 return (EPROTONOSUPPORT); 911 } 912 913 int 914 ipproto_unregister(short ipproto) 915 { 916 struct protosw *pr; 917 918 /* Sanity checks. */ 919 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 920 return (EPROTONOSUPPORT); 921 922 /* Check if the protocol was indeed registered. */ 923 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 924 if (pr == NULL) 925 return (EPFNOSUPPORT); 926 if (ip_protox[ipproto] == pr - inetsw) /* IPPROTO_RAW */ 927 return (ENOENT); 928 929 /* Reset the protocol slot to IPPROTO_RAW. */ 930 ip_protox[ipproto] = pr - inetsw; 931 return (0); 932 } 933 934 u_char inetctlerrmap[PRC_NCMDS] = { 935 0, 0, 0, 0, 936 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 937 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 938 EMSGSIZE, EHOSTUNREACH, 0, 0, 939 0, 0, EHOSTUNREACH, 0, 940 ENOPROTOOPT, ECONNREFUSED 941 }; 942 943 /* 944 * Forward a packet. If some error occurs return the sender 945 * an icmp packet. Note we can't always generate a meaningful 946 * icmp message because icmp doesn't have a large enough repertoire 947 * of codes and types. 948 * 949 * If not forwarding, just drop the packet. This could be confusing 950 * if ipforwarding was zero but some routing protocol was advancing 951 * us as a gateway to somewhere. However, we must let the routing 952 * protocol deal with that. 953 * 954 * The srcrt parameter indicates whether the packet is being forwarded 955 * via a source route. 956 */ 957 void 958 ip_forward(struct mbuf *m, int srcrt) 959 { 960 struct ip *ip = mtod(m, struct ip *); 961 struct in_ifaddr *ia; 962 struct mbuf *mcopy; 963 struct sockaddr_in *sin; 964 struct in_addr dest; 965 struct route ro; 966 uint32_t flowid; 967 int error, type = 0, code = 0, mtu = 0; 968 969 NET_EPOCH_ASSERT(); 970 971 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 972 IPSTAT_INC(ips_cantforward); 973 m_freem(m); 974 return; 975 } 976 if ( 977 #ifdef IPSTEALTH 978 V_ipstealth == 0 && 979 #endif 980 ip->ip_ttl <= IPTTLDEC) { 981 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 982 return; 983 } 984 985 bzero(&ro, sizeof(ro)); 986 sin = (struct sockaddr_in *)&ro.ro_dst; 987 sin->sin_family = AF_INET; 988 sin->sin_len = sizeof(*sin); 989 sin->sin_addr = ip->ip_dst; 990 flowid = m->m_pkthdr.flowid; 991 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 992 if (ro.ro_nh != NULL) { 993 ia = ifatoia(ro.ro_nh->nh_ifa); 994 } else 995 ia = NULL; 996 /* 997 * Save the IP header and at most 8 bytes of the payload, 998 * in case we need to generate an ICMP message to the src. 999 * 1000 * XXX this can be optimized a lot by saving the data in a local 1001 * buffer on the stack (72 bytes at most), and only allocating the 1002 * mbuf if really necessary. The vast majority of the packets 1003 * are forwarded without having to send an ICMP back (either 1004 * because unnecessary, or because rate limited), so we are 1005 * really we are wasting a lot of work here. 1006 * 1007 * We don't use m_copym() because it might return a reference 1008 * to a shared cluster. Both this function and ip_output() 1009 * assume exclusive access to the IP header in `m', so any 1010 * data in a cluster may change before we reach icmp_error(). 1011 */ 1012 mcopy = m_gethdr(M_NOWAIT, m->m_type); 1013 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 1014 /* 1015 * It's probably ok if the pkthdr dup fails (because 1016 * the deep copy of the tag chain failed), but for now 1017 * be conservative and just discard the copy since 1018 * code below may some day want the tags. 1019 */ 1020 m_free(mcopy); 1021 mcopy = NULL; 1022 } 1023 if (mcopy != NULL) { 1024 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 1025 mcopy->m_pkthdr.len = mcopy->m_len; 1026 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 1027 } 1028 #ifdef IPSTEALTH 1029 if (V_ipstealth == 0) 1030 #endif 1031 ip->ip_ttl -= IPTTLDEC; 1032 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1033 if (IPSEC_ENABLED(ipv4)) { 1034 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 1035 /* mbuf consumed by IPsec */ 1036 RO_NHFREE(&ro); 1037 m_freem(mcopy); 1038 if (error != EINPROGRESS) 1039 IPSTAT_INC(ips_cantforward); 1040 return; 1041 } 1042 /* No IPsec processing required */ 1043 } 1044 #endif /* IPSEC */ 1045 /* 1046 * If forwarding packet using same interface that it came in on, 1047 * perhaps should send a redirect to sender to shortcut a hop. 1048 * Only send redirect if source is sending directly to us, 1049 * and if packet was not source routed (or has any options). 1050 * Also, don't send redirect if forwarding using a default route 1051 * or a route modified by a redirect. 1052 */ 1053 dest.s_addr = 0; 1054 if (!srcrt && V_ipsendredirects && 1055 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1056 struct nhop_object *nh; 1057 1058 nh = ro.ro_nh; 1059 1060 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1061 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1062 u_long src = ntohl(ip->ip_src.s_addr); 1063 1064 if (nh_ia != NULL && 1065 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1066 /* Router requirements says to only send host redirects */ 1067 type = ICMP_REDIRECT; 1068 code = ICMP_REDIRECT_HOST; 1069 if (nh->nh_flags & NHF_GATEWAY) { 1070 if (nh->gw_sa.sa_family == AF_INET) 1071 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1072 else /* Do not redirect in case gw is AF_INET6 */ 1073 type = 0; 1074 } else 1075 dest.s_addr = ip->ip_dst.s_addr; 1076 } 1077 } 1078 } 1079 1080 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1081 1082 if (error == EMSGSIZE && ro.ro_nh) 1083 mtu = ro.ro_nh->nh_mtu; 1084 RO_NHFREE(&ro); 1085 1086 if (error) 1087 IPSTAT_INC(ips_cantforward); 1088 else { 1089 IPSTAT_INC(ips_forward); 1090 if (type) 1091 IPSTAT_INC(ips_redirectsent); 1092 else { 1093 if (mcopy) 1094 m_freem(mcopy); 1095 return; 1096 } 1097 } 1098 if (mcopy == NULL) 1099 return; 1100 1101 switch (error) { 1102 case 0: /* forwarded, but need redirect */ 1103 /* type, code set above */ 1104 break; 1105 1106 case ENETUNREACH: 1107 case EHOSTUNREACH: 1108 case ENETDOWN: 1109 case EHOSTDOWN: 1110 default: 1111 type = ICMP_UNREACH; 1112 code = ICMP_UNREACH_HOST; 1113 break; 1114 1115 case EMSGSIZE: 1116 type = ICMP_UNREACH; 1117 code = ICMP_UNREACH_NEEDFRAG; 1118 /* 1119 * If the MTU was set before make sure we are below the 1120 * interface MTU. 1121 * If the MTU wasn't set before use the interface mtu or 1122 * fall back to the next smaller mtu step compared to the 1123 * current packet size. 1124 */ 1125 if (mtu != 0) { 1126 if (ia != NULL) 1127 mtu = min(mtu, ia->ia_ifp->if_mtu); 1128 } else { 1129 if (ia != NULL) 1130 mtu = ia->ia_ifp->if_mtu; 1131 else 1132 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1133 } 1134 IPSTAT_INC(ips_cantfrag); 1135 break; 1136 1137 case ENOBUFS: 1138 case EACCES: /* ipfw denied packet */ 1139 m_freem(mcopy); 1140 return; 1141 } 1142 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1143 } 1144 1145 #define CHECK_SO_CT(sp, ct) \ 1146 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1147 1148 void 1149 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1150 struct mbuf *m) 1151 { 1152 bool stamped; 1153 1154 stamped = false; 1155 if ((inp->inp_socket->so_options & SO_BINTIME) || 1156 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1157 struct bintime boottimebin, bt; 1158 struct timespec ts1; 1159 1160 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1161 M_TSTMP)) { 1162 mbuf_tstmp2timespec(m, &ts1); 1163 timespec2bintime(&ts1, &bt); 1164 getboottimebin(&boottimebin); 1165 bintime_add(&bt, &boottimebin); 1166 } else { 1167 bintime(&bt); 1168 } 1169 *mp = sbcreatecontrol((caddr_t)&bt, sizeof(bt), 1170 SCM_BINTIME, SOL_SOCKET); 1171 if (*mp != NULL) { 1172 mp = &(*mp)->m_next; 1173 stamped = true; 1174 } 1175 } 1176 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1177 struct bintime boottimebin, bt1; 1178 struct timespec ts1; 1179 struct timeval tv; 1180 1181 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1182 M_TSTMP)) { 1183 mbuf_tstmp2timespec(m, &ts1); 1184 timespec2bintime(&ts1, &bt1); 1185 getboottimebin(&boottimebin); 1186 bintime_add(&bt1, &boottimebin); 1187 bintime2timeval(&bt1, &tv); 1188 } else { 1189 microtime(&tv); 1190 } 1191 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), 1192 SCM_TIMESTAMP, SOL_SOCKET); 1193 if (*mp != NULL) { 1194 mp = &(*mp)->m_next; 1195 stamped = true; 1196 } 1197 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1198 struct bintime boottimebin; 1199 struct timespec ts, ts1; 1200 1201 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1202 M_TSTMP)) { 1203 mbuf_tstmp2timespec(m, &ts); 1204 getboottimebin(&boottimebin); 1205 bintime2timespec(&boottimebin, &ts1); 1206 timespecadd(&ts, &ts1, &ts); 1207 } else { 1208 nanotime(&ts); 1209 } 1210 *mp = sbcreatecontrol((caddr_t)&ts, sizeof(ts), 1211 SCM_REALTIME, SOL_SOCKET); 1212 if (*mp != NULL) { 1213 mp = &(*mp)->m_next; 1214 stamped = true; 1215 } 1216 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1217 struct timespec ts; 1218 1219 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1220 M_TSTMP)) 1221 mbuf_tstmp2timespec(m, &ts); 1222 else 1223 nanouptime(&ts); 1224 *mp = sbcreatecontrol((caddr_t)&ts, sizeof(ts), 1225 SCM_MONOTONIC, SOL_SOCKET); 1226 if (*mp != NULL) { 1227 mp = &(*mp)->m_next; 1228 stamped = true; 1229 } 1230 } 1231 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1232 M_TSTMP)) { 1233 struct sock_timestamp_info sti; 1234 1235 bzero(&sti, sizeof(sti)); 1236 sti.st_info_flags = ST_INFO_HW; 1237 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1238 sti.st_info_flags |= ST_INFO_HW_HPREC; 1239 *mp = sbcreatecontrol((caddr_t)&sti, sizeof(sti), SCM_TIME_INFO, 1240 SOL_SOCKET); 1241 if (*mp != NULL) 1242 mp = &(*mp)->m_next; 1243 } 1244 if (inp->inp_flags & INP_RECVDSTADDR) { 1245 *mp = sbcreatecontrol((caddr_t)&ip->ip_dst, 1246 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1247 if (*mp) 1248 mp = &(*mp)->m_next; 1249 } 1250 if (inp->inp_flags & INP_RECVTTL) { 1251 *mp = sbcreatecontrol((caddr_t)&ip->ip_ttl, 1252 sizeof(u_char), IP_RECVTTL, IPPROTO_IP); 1253 if (*mp) 1254 mp = &(*mp)->m_next; 1255 } 1256 #ifdef notyet 1257 /* XXX 1258 * Moving these out of udp_input() made them even more broken 1259 * than they already were. 1260 */ 1261 /* options were tossed already */ 1262 if (inp->inp_flags & INP_RECVOPTS) { 1263 *mp = sbcreatecontrol((caddr_t)opts_deleted_above, 1264 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1265 if (*mp) 1266 mp = &(*mp)->m_next; 1267 } 1268 /* ip_srcroute doesn't do what we want here, need to fix */ 1269 if (inp->inp_flags & INP_RECVRETOPTS) { 1270 *mp = sbcreatecontrol((caddr_t)ip_srcroute(m), 1271 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1272 if (*mp) 1273 mp = &(*mp)->m_next; 1274 } 1275 #endif 1276 if (inp->inp_flags & INP_RECVIF) { 1277 struct ifnet *ifp; 1278 struct sdlbuf { 1279 struct sockaddr_dl sdl; 1280 u_char pad[32]; 1281 } sdlbuf; 1282 struct sockaddr_dl *sdp; 1283 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1284 1285 if ((ifp = m->m_pkthdr.rcvif) && 1286 ifp->if_index && ifp->if_index <= V_if_index) { 1287 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1288 /* 1289 * Change our mind and don't try copy. 1290 */ 1291 if (sdp->sdl_family != AF_LINK || 1292 sdp->sdl_len > sizeof(sdlbuf)) { 1293 goto makedummy; 1294 } 1295 bcopy(sdp, sdl2, sdp->sdl_len); 1296 } else { 1297 makedummy: 1298 sdl2->sdl_len = 1299 offsetof(struct sockaddr_dl, sdl_data[0]); 1300 sdl2->sdl_family = AF_LINK; 1301 sdl2->sdl_index = 0; 1302 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1303 } 1304 *mp = sbcreatecontrol((caddr_t)sdl2, sdl2->sdl_len, 1305 IP_RECVIF, IPPROTO_IP); 1306 if (*mp) 1307 mp = &(*mp)->m_next; 1308 } 1309 if (inp->inp_flags & INP_RECVTOS) { 1310 *mp = sbcreatecontrol((caddr_t)&ip->ip_tos, 1311 sizeof(u_char), IP_RECVTOS, IPPROTO_IP); 1312 if (*mp) 1313 mp = &(*mp)->m_next; 1314 } 1315 1316 if (inp->inp_flags2 & INP_RECVFLOWID) { 1317 uint32_t flowid, flow_type; 1318 1319 flowid = m->m_pkthdr.flowid; 1320 flow_type = M_HASHTYPE_GET(m); 1321 1322 /* 1323 * XXX should handle the failure of one or the 1324 * other - don't populate both? 1325 */ 1326 *mp = sbcreatecontrol((caddr_t) &flowid, 1327 sizeof(uint32_t), IP_FLOWID, IPPROTO_IP); 1328 if (*mp) 1329 mp = &(*mp)->m_next; 1330 *mp = sbcreatecontrol((caddr_t) &flow_type, 1331 sizeof(uint32_t), IP_FLOWTYPE, IPPROTO_IP); 1332 if (*mp) 1333 mp = &(*mp)->m_next; 1334 } 1335 1336 #ifdef RSS 1337 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1338 uint32_t flowid, flow_type; 1339 uint32_t rss_bucketid; 1340 1341 flowid = m->m_pkthdr.flowid; 1342 flow_type = M_HASHTYPE_GET(m); 1343 1344 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1345 *mp = sbcreatecontrol((caddr_t) &rss_bucketid, 1346 sizeof(uint32_t), IP_RSSBUCKETID, IPPROTO_IP); 1347 if (*mp) 1348 mp = &(*mp)->m_next; 1349 } 1350 } 1351 #endif 1352 } 1353 1354 /* 1355 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1356 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1357 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1358 * compiled. 1359 */ 1360 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1361 VNET_DEFINE(struct socket *, ip_rsvpd); 1362 1363 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1364 1365 int 1366 ip_rsvp_init(struct socket *so) 1367 { 1368 1369 if (so->so_type != SOCK_RAW || 1370 so->so_proto->pr_protocol != IPPROTO_RSVP) 1371 return EOPNOTSUPP; 1372 1373 if (V_ip_rsvpd != NULL) 1374 return EADDRINUSE; 1375 1376 V_ip_rsvpd = so; 1377 /* 1378 * This may seem silly, but we need to be sure we don't over-increment 1379 * the RSVP counter, in case something slips up. 1380 */ 1381 if (!V_ip_rsvp_on) { 1382 V_ip_rsvp_on = 1; 1383 V_rsvp_on++; 1384 } 1385 1386 return 0; 1387 } 1388 1389 int 1390 ip_rsvp_done(void) 1391 { 1392 1393 V_ip_rsvpd = NULL; 1394 /* 1395 * This may seem silly, but we need to be sure we don't over-decrement 1396 * the RSVP counter, in case something slips up. 1397 */ 1398 if (V_ip_rsvp_on) { 1399 V_ip_rsvp_on = 0; 1400 V_rsvp_on--; 1401 } 1402 return 0; 1403 } 1404 1405 int 1406 rsvp_input(struct mbuf **mp, int *offp, int proto) 1407 { 1408 struct mbuf *m; 1409 1410 m = *mp; 1411 *mp = NULL; 1412 1413 if (rsvp_input_p) { /* call the real one if loaded */ 1414 *mp = m; 1415 rsvp_input_p(mp, offp, proto); 1416 return (IPPROTO_DONE); 1417 } 1418 1419 /* Can still get packets with rsvp_on = 0 if there is a local member 1420 * of the group to which the RSVP packet is addressed. But in this 1421 * case we want to throw the packet away. 1422 */ 1423 1424 if (!V_rsvp_on) { 1425 m_freem(m); 1426 return (IPPROTO_DONE); 1427 } 1428 1429 if (V_ip_rsvpd != NULL) { 1430 *mp = m; 1431 rip_input(mp, offp, proto); 1432 return (IPPROTO_DONE); 1433 } 1434 /* Drop the packet */ 1435 m_freem(m); 1436 return (IPPROTO_DONE); 1437 } 1438