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 93CTASSERT(sizeof(struct ip) == 20); 94#endif 95 96/* IP reassembly functions are defined in ip_reass.c. */ 97extern void ipreass_init(void); 98extern void ipreass_drain(void); 99extern void ipreass_slowtimo(void); 100#ifdef VIMAGE 101extern void ipreass_destroy(void); 102#endif 103 104struct rmlock in_ifaddr_lock; 105RM_SYSINIT(in_ifaddr_lock, &in_ifaddr_lock, "in_ifaddr_lock"); 106 107VNET_DEFINE(int, rsvp_on); 108 109VNET_DEFINE(int, ipforwarding); 110SYSCTL_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 */ 118VNET_DEFINE(int, ipsendredirects) = 1; 119SYSCTL_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 */ 136VNET_DEFINE_STATIC(int, ip_checkinterface); 137#define V_ip_checkinterface VNET(ip_checkinterface) 138SYSCTL_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 142VNET_DEFINE(pfil_head_t, inet_pfil_head); /* Packet filter hooks */ 143 144static 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 */ 165static 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 175extern struct domain inetdomain; 176extern struct protosw inetsw[]; 177u_char ip_protox[IPPROTO_MAX]; 178VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */ 179VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */ 180VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */ 181 182#ifdef IPCTL_DEFMTU 183SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW, 184 &ip_mtu, 0, "Default MTU"); 185#endif 186 187#ifdef IPSTEALTH 188VNET_DEFINE(int, ipstealth); 189SYSCTL_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 */ 197VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat); 198VNET_PCPUSTAT_SYSINIT(ipstat); 199SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat, 200 "IP statistics (struct ipstat, netinet/ip_var.h)"); 201 202#ifdef VIMAGE 203VNET_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 */ 210void 211kmod_ipstat_inc(int statnum) 212{ 213 214 counter_u64_add(VNET(ipstat)[statnum], 1); 215} 216 217void 218kmod_ipstat_dec(int statnum) 219{ 220 221 counter_u64_add(VNET(ipstat)[statnum], -1); 222} 223 224static int 225sysctl_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} 237SYSCTL_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 242static int 243sysctl_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 259SYSCTL_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 265static int 266sysctl_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} 278SYSCTL_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 283static int 284sysctl_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 300SYSCTL_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 */ 310void 311ip_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 379static void 380ip_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 416VNET_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 */ 426void 427ip_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 */ 451void 452ip_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) { 551tooshort: 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 } 635passin: 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 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 740 /* 741 * RFC 3927 2.7: Do not forward multicast packets from 742 * IN_LINKLOCAL. 743 */ 744 if (V_ip_mrouter && !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 745 /* 746 * If we are acting as a multicast router, all 747 * incoming multicast packets are passed to the 748 * kernel-level multicast forwarding function. 749 * The packet is returned (relatively) intact; if 750 * ip_mforward() returns a non-zero value, the packet 751 * must be discarded, else it may be accepted below. 752 */ 753 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 754 IPSTAT_INC(ips_cantforward); 755 m_freem(m); 756 return; 757 } 758 759 /* 760 * The process-level routing daemon needs to receive 761 * all multicast IGMP packets, whether or not this 762 * host belongs to their destination groups. 763 */ 764 if (ip->ip_p == IPPROTO_IGMP) 765 goto ours; 766 IPSTAT_INC(ips_forward); 767 } 768 /* 769 * Assume the packet is for us, to avoid prematurely taking 770 * a lock on the in_multi hash. Protocols must perform 771 * their own filtering and update statistics accordingly. 772 */ 773 goto ours; 774 } 775 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 776 goto ours; 777 if (ip->ip_dst.s_addr == INADDR_ANY) 778 goto ours; 779 /* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */ 780 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || 781 IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 782 IPSTAT_INC(ips_cantforward); 783 m_freem(m); 784 return; 785 } 786 787 /* 788 * Not for us; forward if possible and desirable. 789 */ 790 if (V_ipforwarding == 0) { 791 IPSTAT_INC(ips_cantforward); 792 m_freem(m); 793 } else { 794 ip_forward(m, dchg); 795 } 796 return; 797 798ours: 799#ifdef IPSTEALTH 800 /* 801 * IPSTEALTH: Process non-routing options only 802 * if the packet is destined for us. 803 */ 804 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 805 return; 806#endif /* IPSTEALTH */ 807 808 /* 809 * Attempt reassembly; if it succeeds, proceed. 810 * ip_reass() will return a different mbuf. 811 */ 812 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 813 /* XXXGL: shouldn't we save & set m_flags? */ 814 m = ip_reass(m); 815 if (m == NULL) 816 return; 817 ip = mtod(m, struct ip *); 818 /* Get the header length of the reassembled packet */ 819 hlen = ip->ip_hl << 2; 820 } 821 822#if defined(IPSEC) || defined(IPSEC_SUPPORT) 823 if (IPSEC_ENABLED(ipv4)) { 824 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 825 return; 826 } 827#endif /* IPSEC */ 828 829 /* 830 * Switch out to protocol's input routine. 831 */ 832 IPSTAT_INC(ips_delivered); 833 834 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p); 835 return; 836bad: 837 m_freem(m); 838} 839 840/* 841 * IP timer processing; 842 * if a timer expires on a reassembly 843 * queue, discard it. 844 */ 845void 846ip_slowtimo(void) 847{ 848 VNET_ITERATOR_DECL(vnet_iter); 849 850 VNET_LIST_RLOCK_NOSLEEP(); 851 VNET_FOREACH(vnet_iter) { 852 CURVNET_SET(vnet_iter); 853 ipreass_slowtimo(); 854 CURVNET_RESTORE(); 855 } 856 VNET_LIST_RUNLOCK_NOSLEEP(); 857} 858 859void 860ip_drain(void) 861{ 862 VNET_ITERATOR_DECL(vnet_iter); 863 864 VNET_LIST_RLOCK_NOSLEEP(); 865 VNET_FOREACH(vnet_iter) { 866 CURVNET_SET(vnet_iter); 867 ipreass_drain(); 868 CURVNET_RESTORE(); 869 } 870 VNET_LIST_RUNLOCK_NOSLEEP(); 871} 872 873/* 874 * The protocol to be inserted into ip_protox[] must be already registered 875 * in inetsw[], either statically or through pf_proto_register(). 876 */ 877int 878ipproto_register(short ipproto) 879{ 880 struct protosw *pr; 881 882 /* Sanity checks. */ 883 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 884 return (EPROTONOSUPPORT); 885 886 /* 887 * The protocol slot must not be occupied by another protocol 888 * already. An index pointing to IPPROTO_RAW is unused. 889 */ 890 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 891 if (pr == NULL) 892 return (EPFNOSUPPORT); 893 if (ip_protox[ipproto] != pr - inetsw) /* IPPROTO_RAW */ 894 return (EEXIST); 895 896 /* Find the protocol position in inetsw[] and set the index. */ 897 for (pr = inetdomain.dom_protosw; 898 pr < inetdomain.dom_protoswNPROTOSW; pr++) { 899 if (pr->pr_domain->dom_family == PF_INET && 900 pr->pr_protocol && pr->pr_protocol == ipproto) { 901 ip_protox[pr->pr_protocol] = pr - inetsw; 902 return (0); 903 } 904 } 905 return (EPROTONOSUPPORT); 906} 907 908int 909ipproto_unregister(short ipproto) 910{ 911 struct protosw *pr; 912 913 /* Sanity checks. */ 914 if (ipproto <= 0 || ipproto >= IPPROTO_MAX) 915 return (EPROTONOSUPPORT); 916 917 /* Check if the protocol was indeed registered. */ 918 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 919 if (pr == NULL) 920 return (EPFNOSUPPORT); 921 if (ip_protox[ipproto] == pr - inetsw) /* IPPROTO_RAW */ 922 return (ENOENT); 923 924 /* Reset the protocol slot to IPPROTO_RAW. */ 925 ip_protox[ipproto] = pr - inetsw; 926 return (0); 927} 928 929u_char inetctlerrmap[PRC_NCMDS] = { 930 0, 0, 0, 0, 931 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 932 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 933 EMSGSIZE, EHOSTUNREACH, 0, 0, 934 0, 0, EHOSTUNREACH, 0, 935 ENOPROTOOPT, ECONNREFUSED 936}; 937 938/* 939 * Forward a packet. If some error occurs return the sender 940 * an icmp packet. Note we can't always generate a meaningful 941 * icmp message because icmp doesn't have a large enough repertoire 942 * of codes and types. 943 * 944 * If not forwarding, just drop the packet. This could be confusing 945 * if ipforwarding was zero but some routing protocol was advancing 946 * us as a gateway to somewhere. However, we must let the routing 947 * protocol deal with that. 948 * 949 * The srcrt parameter indicates whether the packet is being forwarded 950 * via a source route. 951 */ 952void 953ip_forward(struct mbuf *m, int srcrt) 954{ 955 struct ip *ip = mtod(m, struct ip *); 956 struct in_ifaddr *ia; 957 struct mbuf *mcopy; 958 struct sockaddr_in *sin; 959 struct in_addr dest; 960 struct route ro; 961 uint32_t flowid; 962 int error, type = 0, code = 0, mtu = 0; 963 964 NET_EPOCH_ASSERT(); 965 966 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 967 IPSTAT_INC(ips_cantforward); 968 m_freem(m); 969 return; 970 } 971 if ( 972#ifdef IPSTEALTH 973 V_ipstealth == 0 && 974#endif 975 ip->ip_ttl <= IPTTLDEC) { 976 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 977 return; 978 } 979 980 bzero(&ro, sizeof(ro)); 981 sin = (struct sockaddr_in *)&ro.ro_dst; 982 sin->sin_family = AF_INET; 983 sin->sin_len = sizeof(*sin); 984 sin->sin_addr = ip->ip_dst; 985 flowid = m->m_pkthdr.flowid; 986 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 987 if (ro.ro_nh != NULL) { 988 ia = ifatoia(ro.ro_nh->nh_ifa); 989 } else 990 ia = NULL; 991 /* 992 * Save the IP header and at most 8 bytes of the payload, 993 * in case we need to generate an ICMP message to the src. 994 * 995 * XXX this can be optimized a lot by saving the data in a local 996 * buffer on the stack (72 bytes at most), and only allocating the 997 * mbuf if really necessary. The vast majority of the packets 998 * are forwarded without having to send an ICMP back (either 999 * because unnecessary, or because rate limited), so we are 1000 * really we are wasting a lot of work here. 1001 * 1002 * We don't use m_copym() because it might return a reference 1003 * to a shared cluster. Both this function and ip_output() 1004 * assume exclusive access to the IP header in `m', so any 1005 * data in a cluster may change before we reach icmp_error(). 1006 */ 1007 mcopy = m_gethdr(M_NOWAIT, m->m_type); 1008 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 1009 /* 1010 * It's probably ok if the pkthdr dup fails (because 1011 * the deep copy of the tag chain failed), but for now 1012 * be conservative and just discard the copy since 1013 * code below may some day want the tags. 1014 */ 1015 m_free(mcopy); 1016 mcopy = NULL; 1017 } 1018 if (mcopy != NULL) { 1019 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 1020 mcopy->m_pkthdr.len = mcopy->m_len; 1021 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 1022 } 1023#ifdef IPSTEALTH 1024 if (V_ipstealth == 0) 1025#endif 1026 ip->ip_ttl -= IPTTLDEC; 1027#if defined(IPSEC) || defined(IPSEC_SUPPORT) 1028 if (IPSEC_ENABLED(ipv4)) { 1029 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 1030 /* mbuf consumed by IPsec */ 1031 RO_NHFREE(&ro); 1032 m_freem(mcopy); 1033 if (error != EINPROGRESS) 1034 IPSTAT_INC(ips_cantforward); 1035 return; 1036 } 1037 /* No IPsec processing required */ 1038 } 1039#endif /* IPSEC */ 1040 /* 1041 * If forwarding packet using same interface that it came in on, 1042 * perhaps should send a redirect to sender to shortcut a hop. 1043 * Only send redirect if source is sending directly to us, 1044 * and if packet was not source routed (or has any options). 1045 * Also, don't send redirect if forwarding using a default route 1046 * or a route modified by a redirect. 1047 */ 1048 dest.s_addr = 0; 1049 if (!srcrt && V_ipsendredirects && 1050 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1051 struct nhop_object *nh; 1052 1053 nh = ro.ro_nh; 1054 1055 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1056 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1057 u_long src = ntohl(ip->ip_src.s_addr); 1058 1059 if (nh_ia != NULL && 1060 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1061 if (nh->nh_flags & NHF_GATEWAY) 1062 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1063 else 1064 dest.s_addr = ip->ip_dst.s_addr; 1065 /* Router requirements says to only send host redirects */ 1066 type = ICMP_REDIRECT; 1067 code = ICMP_REDIRECT_HOST; 1068 } 1069 } 1070 } 1071 1072 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1073 1074 if (error == EMSGSIZE && ro.ro_nh) 1075 mtu = ro.ro_nh->nh_mtu; 1076 RO_NHFREE(&ro); 1077 1078 if (error) 1079 IPSTAT_INC(ips_cantforward); 1080 else { 1081 IPSTAT_INC(ips_forward); 1082 if (type) 1083 IPSTAT_INC(ips_redirectsent); 1084 else { 1085 if (mcopy) 1086 m_freem(mcopy); 1087 return; 1088 } 1089 } 1090 if (mcopy == NULL) 1091 return; 1092 1093 switch (error) { 1094 case 0: /* forwarded, but need redirect */ 1095 /* type, code set above */ 1096 break; 1097 1098 case ENETUNREACH: 1099 case EHOSTUNREACH: 1100 case ENETDOWN: 1101 case EHOSTDOWN: 1102 default: 1103 type = ICMP_UNREACH; 1104 code = ICMP_UNREACH_HOST; 1105 break; 1106 1107 case EMSGSIZE: 1108 type = ICMP_UNREACH; 1109 code = ICMP_UNREACH_NEEDFRAG; 1110 /* 1111 * If the MTU was set before make sure we are below the 1112 * interface MTU. 1113 * If the MTU wasn't set before use the interface mtu or 1114 * fall back to the next smaller mtu step compared to the 1115 * current packet size. 1116 */ 1117 if (mtu != 0) { 1118 if (ia != NULL) 1119 mtu = min(mtu, ia->ia_ifp->if_mtu); 1120 } else { 1121 if (ia != NULL) 1122 mtu = ia->ia_ifp->if_mtu; 1123 else 1124 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1125 } 1126 IPSTAT_INC(ips_cantfrag); 1127 break; 1128 1129 case ENOBUFS: 1130 case EACCES: /* ipfw denied packet */ 1131 m_freem(mcopy); 1132 return; 1133 } 1134 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1135} 1136 1137#define CHECK_SO_CT(sp, ct) \ 1138 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1139 1140void 1141ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1142 struct mbuf *m) 1143{ 1144 bool stamped; 1145 1146 stamped = false; 1147 if ((inp->inp_socket->so_options & SO_BINTIME) || 1148 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1149 struct bintime boottimebin, bt; 1150 struct timespec ts1; 1151 1152 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1153 M_TSTMP)) { 1154 mbuf_tstmp2timespec(m, &ts1); 1155 timespec2bintime(&ts1, &bt); 1156 getboottimebin(&boottimebin); 1157 bintime_add(&bt, &boottimebin); 1158 } else { 1159 bintime(&bt); 1160 } 1161 *mp = sbcreatecontrol((caddr_t)&bt, sizeof(bt), 1162 SCM_BINTIME, SOL_SOCKET); 1163 if (*mp != NULL) { 1164 mp = &(*mp)->m_next; 1165 stamped = true; 1166 } 1167 } 1168 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1169 struct bintime boottimebin, bt1; 1170 struct timespec ts1; 1171 struct timeval tv; 1172 1173 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1174 M_TSTMP)) { 1175 mbuf_tstmp2timespec(m, &ts1); 1176 timespec2bintime(&ts1, &bt1); 1177 getboottimebin(&boottimebin); 1178 bintime_add(&bt1, &boottimebin); 1179 bintime2timeval(&bt1, &tv); 1180 } else { 1181 microtime(&tv); 1182 } 1183 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), 1184 SCM_TIMESTAMP, SOL_SOCKET); 1185 if (*mp != NULL) { 1186 mp = &(*mp)->m_next; 1187 stamped = true; 1188 } 1189 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1190 struct bintime boottimebin; 1191 struct timespec ts, ts1; 1192 1193 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1194 M_TSTMP)) { 1195 mbuf_tstmp2timespec(m, &ts); 1196 getboottimebin(&boottimebin); 1197 bintime2timespec(&boottimebin, &ts1); 1198 timespecadd(&ts, &ts1, &ts); 1199 } else { 1200 nanotime(&ts); 1201 } 1202 *mp = sbcreatecontrol((caddr_t)&ts, sizeof(ts), 1203 SCM_REALTIME, SOL_SOCKET); 1204 if (*mp != NULL) { 1205 mp = &(*mp)->m_next; 1206 stamped = true; 1207 } 1208 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1209 struct timespec ts; 1210 1211 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1212 M_TSTMP)) 1213 mbuf_tstmp2timespec(m, &ts); 1214 else 1215 nanouptime(&ts); 1216 *mp = sbcreatecontrol((caddr_t)&ts, sizeof(ts), 1217 SCM_MONOTONIC, SOL_SOCKET); 1218 if (*mp != NULL) { 1219 mp = &(*mp)->m_next; 1220 stamped = true; 1221 } 1222 } 1223 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1224 M_TSTMP)) { 1225 struct sock_timestamp_info sti; 1226 1227 bzero(&sti, sizeof(sti)); 1228 sti.st_info_flags = ST_INFO_HW; 1229 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1230 sti.st_info_flags |= ST_INFO_HW_HPREC; 1231 *mp = sbcreatecontrol((caddr_t)&sti, sizeof(sti), SCM_TIME_INFO, 1232 SOL_SOCKET); 1233 if (*mp != NULL) 1234 mp = &(*mp)->m_next; 1235 } 1236 if (inp->inp_flags & INP_RECVDSTADDR) { 1237 *mp = sbcreatecontrol((caddr_t)&ip->ip_dst, 1238 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1239 if (*mp) 1240 mp = &(*mp)->m_next; 1241 } 1242 if (inp->inp_flags & INP_RECVTTL) { 1243 *mp = sbcreatecontrol((caddr_t)&ip->ip_ttl, 1244 sizeof(u_char), IP_RECVTTL, IPPROTO_IP); 1245 if (*mp) 1246 mp = &(*mp)->m_next; 1247 } 1248#ifdef notyet 1249 /* XXX 1250 * Moving these out of udp_input() made them even more broken 1251 * than they already were. 1252 */ 1253 /* options were tossed already */ 1254 if (inp->inp_flags & INP_RECVOPTS) { 1255 *mp = sbcreatecontrol((caddr_t)opts_deleted_above, 1256 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1257 if (*mp) 1258 mp = &(*mp)->m_next; 1259 } 1260 /* ip_srcroute doesn't do what we want here, need to fix */ 1261 if (inp->inp_flags & INP_RECVRETOPTS) { 1262 *mp = sbcreatecontrol((caddr_t)ip_srcroute(m), 1263 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1264 if (*mp) 1265 mp = &(*mp)->m_next; 1266 } 1267#endif 1268 if (inp->inp_flags & INP_RECVIF) { 1269 struct ifnet *ifp; 1270 struct sdlbuf { 1271 struct sockaddr_dl sdl; 1272 u_char pad[32]; 1273 } sdlbuf; 1274 struct sockaddr_dl *sdp; 1275 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1276 1277 if ((ifp = m->m_pkthdr.rcvif) && 1278 ifp->if_index && ifp->if_index <= V_if_index) { 1279 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1280 /* 1281 * Change our mind and don't try copy. 1282 */ 1283 if (sdp->sdl_family != AF_LINK || 1284 sdp->sdl_len > sizeof(sdlbuf)) { 1285 goto makedummy; 1286 } 1287 bcopy(sdp, sdl2, sdp->sdl_len); 1288 } else { 1289makedummy: 1290 sdl2->sdl_len = 1291 offsetof(struct sockaddr_dl, sdl_data[0]); 1292 sdl2->sdl_family = AF_LINK; 1293 sdl2->sdl_index = 0; 1294 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1295 } 1296 *mp = sbcreatecontrol((caddr_t)sdl2, sdl2->sdl_len, 1297 IP_RECVIF, IPPROTO_IP); 1298 if (*mp) 1299 mp = &(*mp)->m_next; 1300 } 1301 if (inp->inp_flags & INP_RECVTOS) { 1302 *mp = sbcreatecontrol((caddr_t)&ip->ip_tos, 1303 sizeof(u_char), IP_RECVTOS, IPPROTO_IP); 1304 if (*mp) 1305 mp = &(*mp)->m_next; 1306 } 1307 1308 if (inp->inp_flags2 & INP_RECVFLOWID) { 1309 uint32_t flowid, flow_type; 1310 1311 flowid = m->m_pkthdr.flowid; 1312 flow_type = M_HASHTYPE_GET(m); 1313 1314 /* 1315 * XXX should handle the failure of one or the 1316 * other - don't populate both? 1317 */ 1318 *mp = sbcreatecontrol((caddr_t) &flowid, 1319 sizeof(uint32_t), IP_FLOWID, IPPROTO_IP); 1320 if (*mp) 1321 mp = &(*mp)->m_next; 1322 *mp = sbcreatecontrol((caddr_t) &flow_type, 1323 sizeof(uint32_t), IP_FLOWTYPE, IPPROTO_IP); 1324 if (*mp) 1325 mp = &(*mp)->m_next; 1326 } 1327 1328#ifdef RSS 1329 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1330 uint32_t flowid, flow_type; 1331 uint32_t rss_bucketid; 1332 1333 flowid = m->m_pkthdr.flowid; 1334 flow_type = M_HASHTYPE_GET(m); 1335 1336 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1337 *mp = sbcreatecontrol((caddr_t) &rss_bucketid, 1338 sizeof(uint32_t), IP_RSSBUCKETID, IPPROTO_IP); 1339 if (*mp) 1340 mp = &(*mp)->m_next; 1341 } 1342 } 1343#endif 1344} 1345 1346/* 1347 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1348 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1349 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1350 * compiled. 1351 */ 1352VNET_DEFINE_STATIC(int, ip_rsvp_on); 1353VNET_DEFINE(struct socket *, ip_rsvpd); 1354 1355#define V_ip_rsvp_on VNET(ip_rsvp_on) 1356 1357int 1358ip_rsvp_init(struct socket *so) 1359{ 1360 1361 if (so->so_type != SOCK_RAW || 1362 so->so_proto->pr_protocol != IPPROTO_RSVP) 1363 return EOPNOTSUPP; 1364 1365 if (V_ip_rsvpd != NULL) 1366 return EADDRINUSE; 1367 1368 V_ip_rsvpd = so; 1369 /* 1370 * This may seem silly, but we need to be sure we don't over-increment 1371 * the RSVP counter, in case something slips up. 1372 */ 1373 if (!V_ip_rsvp_on) { 1374 V_ip_rsvp_on = 1; 1375 V_rsvp_on++; 1376 } 1377 1378 return 0; 1379} 1380 1381int 1382ip_rsvp_done(void) 1383{ 1384 1385 V_ip_rsvpd = NULL; 1386 /* 1387 * This may seem silly, but we need to be sure we don't over-decrement 1388 * the RSVP counter, in case something slips up. 1389 */ 1390 if (V_ip_rsvp_on) { 1391 V_ip_rsvp_on = 0; 1392 V_rsvp_on--; 1393 } 1394 return 0; 1395} 1396 1397int 1398rsvp_input(struct mbuf **mp, int *offp, int proto) 1399{ 1400 struct mbuf *m; 1401 1402 m = *mp; 1403 *mp = NULL; 1404 1405 if (rsvp_input_p) { /* call the real one if loaded */ 1406 *mp = m; 1407 rsvp_input_p(mp, offp, proto); 1408 return (IPPROTO_DONE); 1409 } 1410 1411 /* Can still get packets with rsvp_on = 0 if there is a local member 1412 * of the group to which the RSVP packet is addressed. But in this 1413 * case we want to throw the packet away. 1414 */ 1415 1416 if (!V_rsvp_on) { 1417 m_freem(m); 1418 return (IPPROTO_DONE); 1419 } 1420 1421 if (V_ip_rsvpd != NULL) { 1422 *mp = m; 1423 rip_input(mp, offp, proto); 1424 return (IPPROTO_DONE); 1425 } 1426 /* Drop the packet */ 1427 m_freem(m); 1428 return (IPPROTO_DONE); 1429} 1430