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() does not generate redirects, so fall 566 * through to normal processing if redirects are required. 567 * ip_tryforward() does inbound and outbound packet firewall 568 * processing. If firewall has decided that destination becomes 569 * our local address, it sets M_FASTFWD_OURS flag. In this 570 * case skip another inbound firewall processing and update 571 * ip pointer. 572 */ 573 if (V_ipforwarding != 0 574 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 575 && (!IPSEC_ENABLED(ipv4) || 576 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 577 #endif 578 ) { 579 if ((m = ip_tryforward(m)) == NULL) 580 return; 581 if (m->m_flags & M_FASTFWD_OURS) { 582 m->m_flags &= ~M_FASTFWD_OURS; 583 ip = mtod(m, struct ip *); 584 goto ours; 585 } 586 } 587 588 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 589 /* 590 * Bypass packet filtering for packets previously handled by IPsec. 591 */ 592 if (IPSEC_ENABLED(ipv4) && 593 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 594 goto passin; 595 #endif 596 597 /* 598 * Run through list of hooks for input packets. 599 * 600 * NB: Beware of the destination address changing (e.g. 601 * by NAT rewriting). When this happens, tell 602 * ip_forward to do the right thing. 603 */ 604 605 /* Jump over all PFIL processing if hooks are not active. */ 606 if (!PFIL_HOOKED_IN(V_inet_pfil_head)) 607 goto passin; 608 609 odst = ip->ip_dst; 610 if (pfil_run_hooks(V_inet_pfil_head, &m, ifp, PFIL_IN, NULL) != 611 PFIL_PASS) 612 return; 613 if (m == NULL) /* consumed by filter */ 614 return; 615 616 ip = mtod(m, struct ip *); 617 dchg = (odst.s_addr != ip->ip_dst.s_addr); 618 ifp = m->m_pkthdr.rcvif; 619 620 if (m->m_flags & M_FASTFWD_OURS) { 621 m->m_flags &= ~M_FASTFWD_OURS; 622 goto ours; 623 } 624 if (m->m_flags & M_IP_NEXTHOP) { 625 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 626 /* 627 * Directly ship the packet on. This allows 628 * forwarding packets originally destined to us 629 * to some other directly connected host. 630 */ 631 ip_forward(m, 1); 632 return; 633 } 634 } 635 passin: 636 637 /* 638 * Process options and, if not destined for us, 639 * ship it on. ip_dooptions returns 1 when an 640 * error was detected (causing an icmp message 641 * to be sent and the original packet to be freed). 642 */ 643 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 644 return; 645 646 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 647 * matter if it is destined to another node, or whether it is 648 * a multicast one, RSVP wants it! and prevents it from being forwarded 649 * anywhere else. Also checks if the rsvp daemon is running before 650 * grabbing the packet. 651 */ 652 if (V_rsvp_on && ip->ip_p==IPPROTO_RSVP) 653 goto ours; 654 655 /* 656 * Check our list of addresses, to see if the packet is for us. 657 * If we don't have any addresses, assume any unicast packet 658 * we receive might be for us (and let the upper layers deal 659 * with it). 660 */ 661 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) && 662 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 663 goto ours; 664 665 /* 666 * Enable a consistency check between the destination address 667 * and the arrival interface for a unicast packet (the RFC 1122 668 * strong ES model) if IP forwarding is disabled and the packet 669 * is not locally generated and the packet is not subject to 670 * 'ipfw fwd'. 671 * 672 * XXX - Checking also should be disabled if the destination 673 * address is ipnat'ed to a different interface. 674 * 675 * XXX - Checking is incompatible with IP aliases added 676 * to the loopback interface instead of the interface where 677 * the packets are received. 678 * 679 * XXX - This is the case for carp vhost IPs as well so we 680 * insert a workaround. If the packet got here, we already 681 * checked with carp_iamatch() and carp_forus(). 682 */ 683 checkif = V_ip_checkinterface && (V_ipforwarding == 0) && 684 ifp != NULL && ((ifp->if_flags & IFF_LOOPBACK) == 0) && 685 ifp->if_carp == NULL && (dchg == 0); 686 687 /* 688 * Check for exact addresses in the hash bucket. 689 */ 690 IN_IFADDR_RLOCK(&in_ifa_tracker); 691 LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 692 /* 693 * If the address matches, verify that the packet 694 * arrived via the correct interface if checking is 695 * enabled. 696 */ 697 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr && 698 (!checkif || ia->ia_ifp == ifp)) { 699 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 700 counter_u64_add(ia->ia_ifa.ifa_ibytes, 701 m->m_pkthdr.len); 702 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 703 goto ours; 704 } 705 } 706 IN_IFADDR_RUNLOCK(&in_ifa_tracker); 707 708 /* 709 * Check for broadcast addresses. 710 * 711 * Only accept broadcast packets that arrive via the matching 712 * interface. Reception of forwarded directed broadcasts would 713 * be handled via ip_forward() and ether_output() with the loopback 714 * into the stack for SIMPLEX interfaces handled by ether_output(). 715 */ 716 if (ifp != NULL && ifp->if_flags & IFF_BROADCAST) { 717 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 718 if (ifa->ifa_addr->sa_family != AF_INET) 719 continue; 720 ia = ifatoia(ifa); 721 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 722 ip->ip_dst.s_addr) { 723 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 724 counter_u64_add(ia->ia_ifa.ifa_ibytes, 725 m->m_pkthdr.len); 726 goto ours; 727 } 728 #ifdef BOOTP_COMPAT 729 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 730 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 731 counter_u64_add(ia->ia_ifa.ifa_ibytes, 732 m->m_pkthdr.len); 733 goto ours; 734 } 735 #endif 736 } 737 ia = NULL; 738 } 739 /* RFC 3927 2.7: Do not forward datagrams for 169.254.0.0/16. */ 740 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) { 741 IPSTAT_INC(ips_cantforward); 742 m_freem(m); 743 return; 744 } 745 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 746 if (V_ip_mrouter) { 747 /* 748 * If we are acting as a multicast router, all 749 * incoming multicast packets are passed to the 750 * kernel-level multicast forwarding function. 751 * The packet is returned (relatively) intact; if 752 * ip_mforward() returns a non-zero value, the packet 753 * must be discarded, else it may be accepted below. 754 */ 755 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 756 IPSTAT_INC(ips_cantforward); 757 m_freem(m); 758 return; 759 } 760 761 /* 762 * The process-level routing daemon needs to receive 763 * all multicast IGMP packets, whether or not this 764 * host belongs to their destination groups. 765 */ 766 if (ip->ip_p == IPPROTO_IGMP) 767 goto ours; 768 IPSTAT_INC(ips_forward); 769 } 770 /* 771 * Assume the packet is for us, to avoid prematurely taking 772 * a lock on the in_multi hash. Protocols must perform 773 * their own filtering and update statistics accordingly. 774 */ 775 goto ours; 776 } 777 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 778 goto ours; 779 if (ip->ip_dst.s_addr == INADDR_ANY) 780 goto ours; 781 782 /* 783 * Not for us; forward if possible and desirable. 784 */ 785 if (V_ipforwarding == 0) { 786 IPSTAT_INC(ips_cantforward); 787 m_freem(m); 788 } else { 789 ip_forward(m, dchg); 790 } 791 return; 792 793 ours: 794 #ifdef IPSTEALTH 795 /* 796 * IPSTEALTH: Process non-routing options only 797 * if the packet is destined for us. 798 */ 799 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 800 return; 801 #endif /* IPSTEALTH */ 802 803 /* 804 * Attempt reassembly; if it succeeds, proceed. 805 * ip_reass() will return a different mbuf. 806 */ 807 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 808 /* XXXGL: shouldn't we save & set m_flags? */ 809 m = ip_reass(m); 810 if (m == NULL) 811 return; 812 ip = mtod(m, struct ip *); 813 /* Get the header length of the reassembled packet */ 814 hlen = ip->ip_hl << 2; 815 } 816 817 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 818 if (IPSEC_ENABLED(ipv4)) { 819 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 820 return; 821 } 822 #endif /* IPSEC */ 823 824 /* 825 * Switch out to protocol's input routine. 826 */ 827 IPSTAT_INC(ips_delivered); 828 829 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p); 830 return; 831 bad: 832 m_freem(m); 833 } 834 835 /* 836 * IP timer processing; 837 * if a timer expires on a reassembly 838 * queue, discard it. 839 */ 840 void 841 ip_slowtimo(void) 842 { 843 VNET_ITERATOR_DECL(vnet_iter); 844 845 VNET_LIST_RLOCK_NOSLEEP(); 846 VNET_FOREACH(vnet_iter) { 847 CURVNET_SET(vnet_iter); 848 ipreass_slowtimo(); 849 CURVNET_RESTORE(); 850 } 851 VNET_LIST_RUNLOCK_NOSLEEP(); 852 } 853 854 void 855 ip_drain(void) 856 { 857 VNET_ITERATOR_DECL(vnet_iter); 858 859 VNET_LIST_RLOCK_NOSLEEP(); 860 VNET_FOREACH(vnet_iter) { 861 CURVNET_SET(vnet_iter); 862 ipreass_drain(); 863 CURVNET_RESTORE(); 864 } 865 VNET_LIST_RUNLOCK_NOSLEEP(); 866 } 867 868 /* 869 * The protocol to be inserted into ip_protox[] must be already registered 870 * in inetsw[], either statically or through pf_proto_register(). 871 */ 872 int 873 ipproto_register(short ipproto) 874 { 875 struct protosw *pr; 876 877 /* Sanity checks. */ 878 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 879 return (EPROTONOSUPPORT); 880 881 /* 882 * The protocol slot must not be occupied by another protocol 883 * already. An index pointing to IPPROTO_RAW is unused. 884 */ 885 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 886 if (pr == NULL) 887 return (EPFNOSUPPORT); 888 if (ip_protox[ipproto] != pr - inetsw) /* IPPROTO_RAW */ 889 return (EEXIST); 890 891 /* Find the protocol position in inetsw[] and set the index. */ 892 for (pr = inetdomain.dom_protosw; 893 pr < inetdomain.dom_protoswNPROTOSW; pr++) { 894 if (pr->pr_domain->dom_family == PF_INET && 895 pr->pr_protocol && pr->pr_protocol == ipproto) { 896 ip_protox[pr->pr_protocol] = pr - inetsw; 897 return (0); 898 } 899 } 900 return (EPROTONOSUPPORT); 901 } 902 903 int 904 ipproto_unregister(short ipproto) 905 { 906 struct protosw *pr; 907 908 /* Sanity checks. */ 909 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 910 return (EPROTONOSUPPORT); 911 912 /* Check if the protocol was indeed registered. */ 913 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 914 if (pr == NULL) 915 return (EPFNOSUPPORT); 916 if (ip_protox[ipproto] == pr - inetsw) /* IPPROTO_RAW */ 917 return (ENOENT); 918 919 /* Reset the protocol slot to IPPROTO_RAW. */ 920 ip_protox[ipproto] = pr - inetsw; 921 return (0); 922 } 923 924 u_char inetctlerrmap[PRC_NCMDS] = { 925 0, 0, 0, 0, 926 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 927 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 928 EMSGSIZE, EHOSTUNREACH, 0, 0, 929 0, 0, EHOSTUNREACH, 0, 930 ENOPROTOOPT, ECONNREFUSED 931 }; 932 933 /* 934 * Forward a packet. If some error occurs return the sender 935 * an icmp packet. Note we can't always generate a meaningful 936 * icmp message because icmp doesn't have a large enough repertoire 937 * of codes and types. 938 * 939 * If not forwarding, just drop the packet. This could be confusing 940 * if ipforwarding was zero but some routing protocol was advancing 941 * us as a gateway to somewhere. However, we must let the routing 942 * protocol deal with that. 943 * 944 * The srcrt parameter indicates whether the packet is being forwarded 945 * via a source route. 946 */ 947 void 948 ip_forward(struct mbuf *m, int srcrt) 949 { 950 struct ip *ip = mtod(m, struct ip *); 951 struct in_ifaddr *ia; 952 struct mbuf *mcopy; 953 struct sockaddr_in *sin; 954 struct in_addr dest; 955 struct route ro; 956 uint32_t flowid; 957 int error, type = 0, code = 0, mtu = 0; 958 959 NET_EPOCH_ASSERT(); 960 961 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 962 IPSTAT_INC(ips_cantforward); 963 m_freem(m); 964 return; 965 } 966 if ( 967 #ifdef IPSTEALTH 968 V_ipstealth == 0 && 969 #endif 970 ip->ip_ttl <= IPTTLDEC) { 971 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 972 return; 973 } 974 975 bzero(&ro, sizeof(ro)); 976 sin = (struct sockaddr_in *)&ro.ro_dst; 977 sin->sin_family = AF_INET; 978 sin->sin_len = sizeof(*sin); 979 sin->sin_addr = ip->ip_dst; 980 flowid = m->m_pkthdr.flowid; 981 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 982 if (ro.ro_nh != NULL) { 983 ia = ifatoia(ro.ro_nh->nh_ifa); 984 } else 985 ia = NULL; 986 /* 987 * Save the IP header and at most 8 bytes of the payload, 988 * in case we need to generate an ICMP message to the src. 989 * 990 * XXX this can be optimized a lot by saving the data in a local 991 * buffer on the stack (72 bytes at most), and only allocating the 992 * mbuf if really necessary. The vast majority of the packets 993 * are forwarded without having to send an ICMP back (either 994 * because unnecessary, or because rate limited), so we are 995 * really we are wasting a lot of work here. 996 * 997 * We don't use m_copym() because it might return a reference 998 * to a shared cluster. Both this function and ip_output() 999 * assume exclusive access to the IP header in `m', so any 1000 * data in a cluster may change before we reach icmp_error(). 1001 */ 1002 mcopy = m_gethdr(M_NOWAIT, m->m_type); 1003 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 1004 /* 1005 * It's probably ok if the pkthdr dup fails (because 1006 * the deep copy of the tag chain failed), but for now 1007 * be conservative and just discard the copy since 1008 * code below may some day want the tags. 1009 */ 1010 m_free(mcopy); 1011 mcopy = NULL; 1012 } 1013 if (mcopy != NULL) { 1014 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 1015 mcopy->m_pkthdr.len = mcopy->m_len; 1016 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 1017 } 1018 #ifdef IPSTEALTH 1019 if (V_ipstealth == 0) 1020 #endif 1021 ip->ip_ttl -= IPTTLDEC; 1022 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1023 if (IPSEC_ENABLED(ipv4)) { 1024 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 1025 /* mbuf consumed by IPsec */ 1026 RO_NHFREE(&ro); 1027 m_freem(mcopy); 1028 if (error != EINPROGRESS) 1029 IPSTAT_INC(ips_cantforward); 1030 return; 1031 } 1032 /* No IPsec processing required */ 1033 } 1034 #endif /* IPSEC */ 1035 /* 1036 * If forwarding packet using same interface that it came in on, 1037 * perhaps should send a redirect to sender to shortcut a hop. 1038 * Only send redirect if source is sending directly to us, 1039 * and if packet was not source routed (or has any options). 1040 * Also, don't send redirect if forwarding using a default route 1041 * or a route modified by a redirect. 1042 */ 1043 dest.s_addr = 0; 1044 if (!srcrt && V_ipsendredirects && 1045 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1046 struct nhop_object *nh; 1047 1048 nh = ro.ro_nh; 1049 1050 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1051 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1052 u_long src = ntohl(ip->ip_src.s_addr); 1053 1054 if (nh_ia != NULL && 1055 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1056 if (nh->nh_flags & NHF_GATEWAY) 1057 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1058 else 1059 dest.s_addr = ip->ip_dst.s_addr; 1060 /* Router requirements says to only send host redirects */ 1061 type = ICMP_REDIRECT; 1062 code = ICMP_REDIRECT_HOST; 1063 } 1064 } 1065 } 1066 1067 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1068 1069 if (error == EMSGSIZE && ro.ro_nh) 1070 mtu = ro.ro_nh->nh_mtu; 1071 RO_NHFREE(&ro); 1072 1073 if (error) 1074 IPSTAT_INC(ips_cantforward); 1075 else { 1076 IPSTAT_INC(ips_forward); 1077 if (type) 1078 IPSTAT_INC(ips_redirectsent); 1079 else { 1080 if (mcopy) 1081 m_freem(mcopy); 1082 return; 1083 } 1084 } 1085 if (mcopy == NULL) 1086 return; 1087 1088 switch (error) { 1089 case 0: /* forwarded, but need redirect */ 1090 /* type, code set above */ 1091 break; 1092 1093 case ENETUNREACH: 1094 case EHOSTUNREACH: 1095 case ENETDOWN: 1096 case EHOSTDOWN: 1097 default: 1098 type = ICMP_UNREACH; 1099 code = ICMP_UNREACH_HOST; 1100 break; 1101 1102 case EMSGSIZE: 1103 type = ICMP_UNREACH; 1104 code = ICMP_UNREACH_NEEDFRAG; 1105 /* 1106 * If the MTU was set before make sure we are below the 1107 * interface MTU. 1108 * If the MTU wasn't set before use the interface mtu or 1109 * fall back to the next smaller mtu step compared to the 1110 * current packet size. 1111 */ 1112 if (mtu != 0) { 1113 if (ia != NULL) 1114 mtu = min(mtu, ia->ia_ifp->if_mtu); 1115 } else { 1116 if (ia != NULL) 1117 mtu = ia->ia_ifp->if_mtu; 1118 else 1119 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1120 } 1121 IPSTAT_INC(ips_cantfrag); 1122 break; 1123 1124 case ENOBUFS: 1125 case EACCES: /* ipfw denied packet */ 1126 m_freem(mcopy); 1127 return; 1128 } 1129 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1130 } 1131 1132 #define CHECK_SO_CT(sp, ct) \ 1133 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1134 1135 void 1136 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1137 struct mbuf *m) 1138 { 1139 bool stamped; 1140 1141 stamped = false; 1142 if ((inp->inp_socket->so_options & SO_BINTIME) || 1143 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1144 struct bintime boottimebin, bt; 1145 struct timespec ts1; 1146 1147 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1148 M_TSTMP)) { 1149 mbuf_tstmp2timespec(m, &ts1); 1150 timespec2bintime(&ts1, &bt); 1151 getboottimebin(&boottimebin); 1152 bintime_add(&bt, &boottimebin); 1153 } else { 1154 bintime(&bt); 1155 } 1156 *mp = sbcreatecontrol((caddr_t)&bt, sizeof(bt), 1157 SCM_BINTIME, SOL_SOCKET); 1158 if (*mp != NULL) { 1159 mp = &(*mp)->m_next; 1160 stamped = true; 1161 } 1162 } 1163 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1164 struct bintime boottimebin, bt1; 1165 struct timespec ts1; 1166 struct timeval tv; 1167 1168 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1169 M_TSTMP)) { 1170 mbuf_tstmp2timespec(m, &ts1); 1171 timespec2bintime(&ts1, &bt1); 1172 getboottimebin(&boottimebin); 1173 bintime_add(&bt1, &boottimebin); 1174 bintime2timeval(&bt1, &tv); 1175 } else { 1176 microtime(&tv); 1177 } 1178 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), 1179 SCM_TIMESTAMP, SOL_SOCKET); 1180 if (*mp != NULL) { 1181 mp = &(*mp)->m_next; 1182 stamped = true; 1183 } 1184 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1185 struct bintime boottimebin; 1186 struct timespec ts, ts1; 1187 1188 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1189 M_TSTMP)) { 1190 mbuf_tstmp2timespec(m, &ts); 1191 getboottimebin(&boottimebin); 1192 bintime2timespec(&boottimebin, &ts1); 1193 timespecadd(&ts, &ts1, &ts); 1194 } else { 1195 nanotime(&ts); 1196 } 1197 *mp = sbcreatecontrol((caddr_t)&ts, sizeof(ts), 1198 SCM_REALTIME, SOL_SOCKET); 1199 if (*mp != NULL) { 1200 mp = &(*mp)->m_next; 1201 stamped = true; 1202 } 1203 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1204 struct timespec ts; 1205 1206 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1207 M_TSTMP)) 1208 mbuf_tstmp2timespec(m, &ts); 1209 else 1210 nanouptime(&ts); 1211 *mp = sbcreatecontrol((caddr_t)&ts, sizeof(ts), 1212 SCM_MONOTONIC, SOL_SOCKET); 1213 if (*mp != NULL) { 1214 mp = &(*mp)->m_next; 1215 stamped = true; 1216 } 1217 } 1218 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1219 M_TSTMP)) { 1220 struct sock_timestamp_info sti; 1221 1222 bzero(&sti, sizeof(sti)); 1223 sti.st_info_flags = ST_INFO_HW; 1224 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1225 sti.st_info_flags |= ST_INFO_HW_HPREC; 1226 *mp = sbcreatecontrol((caddr_t)&sti, sizeof(sti), SCM_TIME_INFO, 1227 SOL_SOCKET); 1228 if (*mp != NULL) 1229 mp = &(*mp)->m_next; 1230 } 1231 if (inp->inp_flags & INP_RECVDSTADDR) { 1232 *mp = sbcreatecontrol((caddr_t)&ip->ip_dst, 1233 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1234 if (*mp) 1235 mp = &(*mp)->m_next; 1236 } 1237 if (inp->inp_flags & INP_RECVTTL) { 1238 *mp = sbcreatecontrol((caddr_t)&ip->ip_ttl, 1239 sizeof(u_char), IP_RECVTTL, IPPROTO_IP); 1240 if (*mp) 1241 mp = &(*mp)->m_next; 1242 } 1243 #ifdef notyet 1244 /* XXX 1245 * Moving these out of udp_input() made them even more broken 1246 * than they already were. 1247 */ 1248 /* options were tossed already */ 1249 if (inp->inp_flags & INP_RECVOPTS) { 1250 *mp = sbcreatecontrol((caddr_t)opts_deleted_above, 1251 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1252 if (*mp) 1253 mp = &(*mp)->m_next; 1254 } 1255 /* ip_srcroute doesn't do what we want here, need to fix */ 1256 if (inp->inp_flags & INP_RECVRETOPTS) { 1257 *mp = sbcreatecontrol((caddr_t)ip_srcroute(m), 1258 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1259 if (*mp) 1260 mp = &(*mp)->m_next; 1261 } 1262 #endif 1263 if (inp->inp_flags & INP_RECVIF) { 1264 struct ifnet *ifp; 1265 struct sdlbuf { 1266 struct sockaddr_dl sdl; 1267 u_char pad[32]; 1268 } sdlbuf; 1269 struct sockaddr_dl *sdp; 1270 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1271 1272 if ((ifp = m->m_pkthdr.rcvif) && 1273 ifp->if_index && ifp->if_index <= V_if_index) { 1274 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1275 /* 1276 * Change our mind and don't try copy. 1277 */ 1278 if (sdp->sdl_family != AF_LINK || 1279 sdp->sdl_len > sizeof(sdlbuf)) { 1280 goto makedummy; 1281 } 1282 bcopy(sdp, sdl2, sdp->sdl_len); 1283 } else { 1284 makedummy: 1285 sdl2->sdl_len = 1286 offsetof(struct sockaddr_dl, sdl_data[0]); 1287 sdl2->sdl_family = AF_LINK; 1288 sdl2->sdl_index = 0; 1289 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1290 } 1291 *mp = sbcreatecontrol((caddr_t)sdl2, sdl2->sdl_len, 1292 IP_RECVIF, IPPROTO_IP); 1293 if (*mp) 1294 mp = &(*mp)->m_next; 1295 } 1296 if (inp->inp_flags & INP_RECVTOS) { 1297 *mp = sbcreatecontrol((caddr_t)&ip->ip_tos, 1298 sizeof(u_char), IP_RECVTOS, IPPROTO_IP); 1299 if (*mp) 1300 mp = &(*mp)->m_next; 1301 } 1302 1303 if (inp->inp_flags2 & INP_RECVFLOWID) { 1304 uint32_t flowid, flow_type; 1305 1306 flowid = m->m_pkthdr.flowid; 1307 flow_type = M_HASHTYPE_GET(m); 1308 1309 /* 1310 * XXX should handle the failure of one or the 1311 * other - don't populate both? 1312 */ 1313 *mp = sbcreatecontrol((caddr_t) &flowid, 1314 sizeof(uint32_t), IP_FLOWID, IPPROTO_IP); 1315 if (*mp) 1316 mp = &(*mp)->m_next; 1317 *mp = sbcreatecontrol((caddr_t) &flow_type, 1318 sizeof(uint32_t), IP_FLOWTYPE, IPPROTO_IP); 1319 if (*mp) 1320 mp = &(*mp)->m_next; 1321 } 1322 1323 #ifdef RSS 1324 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1325 uint32_t flowid, flow_type; 1326 uint32_t rss_bucketid; 1327 1328 flowid = m->m_pkthdr.flowid; 1329 flow_type = M_HASHTYPE_GET(m); 1330 1331 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1332 *mp = sbcreatecontrol((caddr_t) &rss_bucketid, 1333 sizeof(uint32_t), IP_RSSBUCKETID, IPPROTO_IP); 1334 if (*mp) 1335 mp = &(*mp)->m_next; 1336 } 1337 } 1338 #endif 1339 } 1340 1341 /* 1342 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1343 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1344 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1345 * compiled. 1346 */ 1347 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1348 VNET_DEFINE(struct socket *, ip_rsvpd); 1349 1350 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1351 1352 int 1353 ip_rsvp_init(struct socket *so) 1354 { 1355 1356 if (so->so_type != SOCK_RAW || 1357 so->so_proto->pr_protocol != IPPROTO_RSVP) 1358 return EOPNOTSUPP; 1359 1360 if (V_ip_rsvpd != NULL) 1361 return EADDRINUSE; 1362 1363 V_ip_rsvpd = so; 1364 /* 1365 * This may seem silly, but we need to be sure we don't over-increment 1366 * the RSVP counter, in case something slips up. 1367 */ 1368 if (!V_ip_rsvp_on) { 1369 V_ip_rsvp_on = 1; 1370 V_rsvp_on++; 1371 } 1372 1373 return 0; 1374 } 1375 1376 int 1377 ip_rsvp_done(void) 1378 { 1379 1380 V_ip_rsvpd = NULL; 1381 /* 1382 * This may seem silly, but we need to be sure we don't over-decrement 1383 * the RSVP counter, in case something slips up. 1384 */ 1385 if (V_ip_rsvp_on) { 1386 V_ip_rsvp_on = 0; 1387 V_rsvp_on--; 1388 } 1389 return 0; 1390 } 1391 1392 int 1393 rsvp_input(struct mbuf **mp, int *offp, int proto) 1394 { 1395 struct mbuf *m; 1396 1397 m = *mp; 1398 *mp = NULL; 1399 1400 if (rsvp_input_p) { /* call the real one if loaded */ 1401 *mp = m; 1402 rsvp_input_p(mp, offp, proto); 1403 return (IPPROTO_DONE); 1404 } 1405 1406 /* Can still get packets with rsvp_on = 0 if there is a local member 1407 * of the group to which the RSVP packet is addressed. But in this 1408 * case we want to throw the packet away. 1409 */ 1410 1411 if (!V_rsvp_on) { 1412 m_freem(m); 1413 return (IPPROTO_DONE); 1414 } 1415 1416 if (V_ip_rsvpd != NULL) { 1417 *mp = m; 1418 rip_input(mp, offp, proto); 1419 return (IPPROTO_DONE); 1420 } 1421 /* Drop the packet */ 1422 m_freem(m); 1423 return (IPPROTO_DONE); 1424 } 1425