ip_input.c revision 1.290
1/* $NetBSD: ip_input.c,v 1.290 2010/11/05 00:21:51 rmind Exp $ */ 2 3/* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * 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 project 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 PROJECT 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 PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32/*- 33 * Copyright (c) 1998 The NetBSD Foundation, Inc. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to The NetBSD Foundation 37 * by Public Access Networks Corporation ("Panix"). It was developed under 38 * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 50 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 51 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 52 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 53 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 54 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 55 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 56 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 57 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 58 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 59 * POSSIBILITY OF SUCH DAMAGE. 60 */ 61 62/* 63 * Copyright (c) 1982, 1986, 1988, 1993 64 * The Regents of the University of California. All rights reserved. 65 * 66 * Redistribution and use in source and binary forms, with or without 67 * modification, are permitted provided that the following conditions 68 * are met: 69 * 1. Redistributions of source code must retain the above copyright 70 * notice, this list of conditions and the following disclaimer. 71 * 2. Redistributions in binary form must reproduce the above copyright 72 * notice, this list of conditions and the following disclaimer in the 73 * documentation and/or other materials provided with the distribution. 74 * 3. Neither the name of the University nor the names of its contributors 75 * may be used to endorse or promote products derived from this software 76 * without specific prior written permission. 77 * 78 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 79 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 80 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 81 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 82 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 83 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 84 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 85 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 86 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 87 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 88 * SUCH DAMAGE. 89 * 90 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 91 */ 92 93#include <sys/cdefs.h> 94__KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.290 2010/11/05 00:21:51 rmind Exp $"); 95 96#include "opt_inet.h" 97#include "opt_compat_netbsd.h" 98#include "opt_gateway.h" 99#include "opt_pfil_hooks.h" 100#include "opt_ipsec.h" 101#include "opt_mrouting.h" 102#include "opt_mbuftrace.h" 103#include "opt_inet_csum.h" 104 105#include <sys/param.h> 106#include <sys/systm.h> 107#include <sys/mbuf.h> 108#include <sys/domain.h> 109#include <sys/protosw.h> 110#include <sys/socket.h> 111#include <sys/socketvar.h> 112#include <sys/errno.h> 113#include <sys/time.h> 114#include <sys/kernel.h> 115#include <sys/pool.h> 116#include <sys/sysctl.h> 117#include <sys/kauth.h> 118 119#include <net/if.h> 120#include <net/if_dl.h> 121#include <net/route.h> 122#include <net/pfil.h> 123 124#include <netinet/in.h> 125#include <netinet/in_systm.h> 126#include <netinet/ip.h> 127#include <netinet/in_pcb.h> 128#include <netinet/in_proto.h> 129#include <netinet/in_var.h> 130#include <netinet/ip_var.h> 131#include <netinet/ip_private.h> 132#include <netinet/ip_icmp.h> 133/* just for gif_ttl */ 134#include <netinet/in_gif.h> 135#include "gif.h" 136#include <net/if_gre.h> 137#include "gre.h" 138 139#ifdef MROUTING 140#include <netinet/ip_mroute.h> 141#endif 142 143#ifdef IPSEC 144#include <netinet6/ipsec.h> 145#include <netinet6/ipsec_private.h> 146#include <netkey/key.h> 147#endif 148#ifdef FAST_IPSEC 149#include <netipsec/ipsec.h> 150#include <netipsec/key.h> 151#endif /* FAST_IPSEC*/ 152 153#ifndef IPFORWARDING 154#ifdef GATEWAY 155#define IPFORWARDING 1 /* forward IP packets not for us */ 156#else /* GATEWAY */ 157#define IPFORWARDING 0 /* don't forward IP packets not for us */ 158#endif /* GATEWAY */ 159#endif /* IPFORWARDING */ 160#ifndef IPSENDREDIRECTS 161#define IPSENDREDIRECTS 1 162#endif 163#ifndef IPFORWSRCRT 164#define IPFORWSRCRT 1 /* forward source-routed packets */ 165#endif 166#ifndef IPALLOWSRCRT 167#define IPALLOWSRCRT 1 /* allow source-routed packets */ 168#endif 169#ifndef IPMTUDISC 170#define IPMTUDISC 1 171#endif 172#ifndef IPMTUDISCTIMEOUT 173#define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 174#endif 175 176#ifdef COMPAT_50 177#include <compat/sys/time.h> 178#include <compat/sys/socket.h> 179#endif 180 181/* 182 * Note: DIRECTED_BROADCAST is handled this way so that previous 183 * configuration using this option will Just Work. 184 */ 185#ifndef IPDIRECTEDBCAST 186#ifdef DIRECTED_BROADCAST 187#define IPDIRECTEDBCAST 1 188#else 189#define IPDIRECTEDBCAST 0 190#endif /* DIRECTED_BROADCAST */ 191#endif /* IPDIRECTEDBCAST */ 192int ipforwarding = IPFORWARDING; 193int ipsendredirects = IPSENDREDIRECTS; 194int ip_defttl = IPDEFTTL; 195int ip_forwsrcrt = IPFORWSRCRT; 196int ip_directedbcast = IPDIRECTEDBCAST; 197int ip_allowsrcrt = IPALLOWSRCRT; 198int ip_mtudisc = IPMTUDISC; 199int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; 200#ifdef DIAGNOSTIC 201int ipprintfs = 0; 202#endif 203 204int ip_do_randomid = 0; 205 206/* 207 * XXX - Setting ip_checkinterface mostly implements the receive side of 208 * the Strong ES model described in RFC 1122, but since the routing table 209 * and transmit implementation do not implement the Strong ES model, 210 * setting this to 1 results in an odd hybrid. 211 * 212 * XXX - ip_checkinterface currently must be disabled if you use ipnat 213 * to translate the destination address to another local interface. 214 * 215 * XXX - ip_checkinterface must be disabled if you add IP aliases 216 * to the loopback interface instead of the interface where the 217 * packets for those addresses are received. 218 */ 219int ip_checkinterface = 0; 220 221 222struct rttimer_queue *ip_mtudisc_timeout_q = NULL; 223 224int ipqmaxlen = IFQ_MAXLEN; 225u_long in_ifaddrhash; /* size of hash table - 1 */ 226int in_ifaddrentries; /* total number of addrs */ 227struct in_ifaddrhead in_ifaddrhead; 228struct in_ifaddrhashhead *in_ifaddrhashtbl; 229u_long in_multihash; /* size of hash table - 1 */ 230int in_multientries; /* total number of addrs */ 231struct in_multihashhead *in_multihashtbl; 232struct ifqueue ipintrq; 233 234uint16_t ip_id; 235 236percpu_t *ipstat_percpu; 237 238#ifdef PFIL_HOOKS 239struct pfil_head inet_pfil_hook; 240#endif 241 242struct pool inmulti_pool; 243 244#ifdef INET_CSUM_COUNTERS 245#include <sys/device.h> 246 247struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 248 NULL, "inet", "hwcsum bad"); 249struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 250 NULL, "inet", "hwcsum ok"); 251struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 252 NULL, "inet", "swcsum"); 253 254#define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 255 256EVCNT_ATTACH_STATIC(ip_hwcsum_bad); 257EVCNT_ATTACH_STATIC(ip_hwcsum_ok); 258EVCNT_ATTACH_STATIC(ip_swcsum); 259 260#else 261 262#define INET_CSUM_COUNTER_INCR(ev) /* nothing */ 263 264#endif /* INET_CSUM_COUNTERS */ 265 266/* 267 * We need to save the IP options in case a protocol wants to respond 268 * to an incoming packet over the same route if the packet got here 269 * using IP source routing. This allows connection establishment and 270 * maintenance when the remote end is on a network that is not known 271 * to us. 272 */ 273int ip_nhops = 0; 274static struct ip_srcrt { 275 struct in_addr dst; /* final destination */ 276 char nop; /* one NOP to align */ 277 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 278 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 279} ip_srcrt; 280 281static void save_rte(u_char *, struct in_addr); 282 283#ifdef MBUFTRACE 284struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx"); 285struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx"); 286#endif 287 288static void sysctl_net_inet_ip_setup(struct sysctllog **); 289 290/* 291 * IP initialization: fill in IP protocol switch table. 292 * All protocols not implemented in kernel go to raw IP protocol handler. 293 */ 294void 295ip_init(void) 296{ 297 const struct protosw *pr; 298 int i; 299 300 sysctl_net_inet_ip_setup(NULL); 301 302 pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", 303 NULL, IPL_SOFTNET); 304 305 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 306 if (pr == 0) 307 panic("ip_init"); 308 for (i = 0; i < IPPROTO_MAX; i++) 309 ip_protox[i] = pr - inetsw; 310 for (pr = inetdomain.dom_protosw; 311 pr < inetdomain.dom_protoswNPROTOSW; pr++) 312 if (pr->pr_domain->dom_family == PF_INET && 313 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 314 ip_protox[pr->pr_protocol] = pr - inetsw; 315 316 ip_reass_init(); 317 318 ip_initid(); 319 ip_id = time_second & 0xfffff; 320 321 ipintrq.ifq_maxlen = ipqmaxlen; 322 323 TAILQ_INIT(&in_ifaddrhead); 324 in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 325 &in_ifaddrhash); 326 in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 327 &in_multihash); 328 ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); 329#ifdef GATEWAY 330 ipflow_init(ip_hashsize); 331#endif 332 333#ifdef PFIL_HOOKS 334 /* Register our Packet Filter hook. */ 335 inet_pfil_hook.ph_type = PFIL_TYPE_AF; 336 inet_pfil_hook.ph_af = AF_INET; 337 i = pfil_head_register(&inet_pfil_hook); 338 if (i != 0) 339 printf("ip_init: WARNING: unable to register pfil hook, " 340 "error %d\n", i); 341#endif /* PFIL_HOOKS */ 342 343#ifdef MBUFTRACE 344 MOWNER_ATTACH(&ip_tx_mowner); 345 MOWNER_ATTACH(&ip_rx_mowner); 346#endif /* MBUFTRACE */ 347 348 ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS); 349} 350 351struct sockaddr_in ipaddr = { 352 .sin_len = sizeof(ipaddr), 353 .sin_family = AF_INET, 354}; 355struct route ipforward_rt; 356 357/* 358 * IP software interrupt routine 359 */ 360void 361ipintr(void) 362{ 363 int s; 364 struct mbuf *m; 365 struct ifqueue lcl_intrq; 366 367 memset(&lcl_intrq, 0, sizeof(lcl_intrq)); 368 ipintrq.ifq_maxlen = ipqmaxlen; 369 370 mutex_enter(softnet_lock); 371 KERNEL_LOCK(1, NULL); 372 if (!IF_IS_EMPTY(&ipintrq)) { 373 s = splnet(); 374 375 /* Take existing queue onto stack */ 376 lcl_intrq = ipintrq; 377 378 /* Zero out global queue, preserving maxlen and drops */ 379 ipintrq.ifq_head = NULL; 380 ipintrq.ifq_tail = NULL; 381 ipintrq.ifq_len = 0; 382 ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen; 383 ipintrq.ifq_drops = lcl_intrq.ifq_drops; 384 385 splx(s); 386 } 387 KERNEL_UNLOCK_ONE(NULL); 388 while (!IF_IS_EMPTY(&lcl_intrq)) { 389 IF_DEQUEUE(&lcl_intrq, m); 390 if (m == NULL) 391 break; 392 ip_input(m); 393 } 394 mutex_exit(softnet_lock); 395} 396 397/* 398 * Ip input routine. Checksum and byte swap header. If fragmented 399 * try to reassemble. Process options. Pass to next level. 400 */ 401void 402ip_input(struct mbuf *m) 403{ 404 struct ip *ip = NULL; 405 struct in_ifaddr *ia; 406 struct ifaddr *ifa; 407 int hlen = 0, len; 408 int downmatch; 409 int checkif; 410 int srcrt = 0; 411#ifdef FAST_IPSEC 412 struct m_tag *mtag; 413 struct tdb_ident *tdbi; 414 struct secpolicy *sp; 415 int error, s; 416#endif /* FAST_IPSEC */ 417 418 MCLAIM(m, &ip_rx_mowner); 419 KASSERT((m->m_flags & M_PKTHDR) != 0); 420 421 /* 422 * If no IP addresses have been set yet but the interfaces 423 * are receiving, can't do anything with incoming packets yet. 424 */ 425 if (TAILQ_FIRST(&in_ifaddrhead) == 0) 426 goto bad; 427 IP_STATINC(IP_STAT_TOTAL); 428 /* 429 * If the IP header is not aligned, slurp it up into a new 430 * mbuf with space for link headers, in the event we forward 431 * it. Otherwise, if it is aligned, make sure the entire 432 * base IP header is in the first mbuf of the chain. 433 */ 434 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 435 if ((m = m_copyup(m, sizeof(struct ip), 436 (max_linkhdr + 3) & ~3)) == NULL) { 437 /* XXXJRT new stat, please */ 438 IP_STATINC(IP_STAT_TOOSMALL); 439 return; 440 } 441 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 442 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 443 IP_STATINC(IP_STAT_TOOSMALL); 444 return; 445 } 446 } 447 ip = mtod(m, struct ip *); 448 if (ip->ip_v != IPVERSION) { 449 IP_STATINC(IP_STAT_BADVERS); 450 goto bad; 451 } 452 hlen = ip->ip_hl << 2; 453 if (hlen < sizeof(struct ip)) { /* minimum header length */ 454 IP_STATINC(IP_STAT_BADHLEN); 455 goto bad; 456 } 457 if (hlen > m->m_len) { 458 if ((m = m_pullup(m, hlen)) == 0) { 459 IP_STATINC(IP_STAT_BADHLEN); 460 return; 461 } 462 ip = mtod(m, struct ip *); 463 } 464 465 /* 466 * RFC1122: packets with a multicast source address are 467 * not allowed. 468 */ 469 if (IN_MULTICAST(ip->ip_src.s_addr)) { 470 IP_STATINC(IP_STAT_BADADDR); 471 goto bad; 472 } 473 474 /* 127/8 must not appear on wire - RFC1122 */ 475 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 476 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 477 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 478 IP_STATINC(IP_STAT_BADADDR); 479 goto bad; 480 } 481 } 482 483 switch (m->m_pkthdr.csum_flags & 484 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 485 M_CSUM_IPv4_BAD)) { 486 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 487 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 488 goto badcsum; 489 490 case M_CSUM_IPv4: 491 /* Checksum was okay. */ 492 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 493 break; 494 495 default: 496 /* 497 * Must compute it ourselves. Maybe skip checksum on 498 * loopback interfaces. 499 */ 500 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 501 IFF_LOOPBACK) || ip_do_loopback_cksum)) { 502 INET_CSUM_COUNTER_INCR(&ip_swcsum); 503 if (in_cksum(m, hlen) != 0) 504 goto badcsum; 505 } 506 break; 507 } 508 509 /* Retrieve the packet length. */ 510 len = ntohs(ip->ip_len); 511 512 /* 513 * Check for additional length bogosity 514 */ 515 if (len < hlen) { 516 IP_STATINC(IP_STAT_BADLEN); 517 goto bad; 518 } 519 520 /* 521 * Check that the amount of data in the buffers 522 * is as at least much as the IP header would have us expect. 523 * Trim mbufs if longer than we expect. 524 * Drop packet if shorter than we expect. 525 */ 526 if (m->m_pkthdr.len < len) { 527 IP_STATINC(IP_STAT_TOOSHORT); 528 goto bad; 529 } 530 if (m->m_pkthdr.len > len) { 531 if (m->m_len == m->m_pkthdr.len) { 532 m->m_len = len; 533 m->m_pkthdr.len = len; 534 } else 535 m_adj(m, len - m->m_pkthdr.len); 536 } 537 538#if defined(IPSEC) 539 /* ipflow (IP fast forwarding) is not compatible with IPsec. */ 540 m->m_flags &= ~M_CANFASTFWD; 541#else 542 /* 543 * Assume that we can create a fast-forward IP flow entry 544 * based on this packet. 545 */ 546 m->m_flags |= M_CANFASTFWD; 547#endif 548 549#ifdef PFIL_HOOKS 550 /* 551 * Run through list of hooks for input packets. If there are any 552 * filters which require that additional packets in the flow are 553 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 554 * Note that filters must _never_ set this flag, as another filter 555 * in the list may have previously cleared it. 556 */ 557 /* 558 * let ipfilter look at packet on the wire, 559 * not the decapsulated packet. 560 */ 561#ifdef IPSEC 562 if (!ipsec_getnhist(m)) 563#elif defined(FAST_IPSEC) 564 if (!ipsec_indone(m)) 565#else 566 if (1) 567#endif 568 { 569 struct in_addr odst; 570 571 odst = ip->ip_dst; 572 if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif, 573 PFIL_IN) != 0) 574 return; 575 if (m == NULL) 576 return; 577 ip = mtod(m, struct ip *); 578 hlen = ip->ip_hl << 2; 579 /* 580 * XXX The setting of "srcrt" here is to prevent ip_forward() 581 * from generating ICMP redirects for packets that have 582 * been redirected by a hook back out on to the same LAN that 583 * they came from and is not an indication that the packet 584 * is being inffluenced by source routing options. This 585 * allows things like 586 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" 587 * where tlp0 is both on the 1.1.1.0/24 network and is the 588 * default route for hosts on 1.1.1.0/24. Of course this 589 * also requires a "map tlp0 ..." to complete the story. 590 * One might argue whether or not this kind of network config. 591 * should be supported in this manner... 592 */ 593 srcrt = (odst.s_addr != ip->ip_dst.s_addr); 594 } 595#endif /* PFIL_HOOKS */ 596 597#ifdef ALTQ 598 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 599 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) { 600 /* packet dropped by traffic conditioner */ 601 return; 602 } 603#endif 604 605 /* 606 * Process options and, if not destined for us, 607 * ship it on. ip_dooptions returns 1 when an 608 * error was detected (causing an icmp message 609 * to be sent and the original packet to be freed). 610 */ 611 ip_nhops = 0; /* for source routed packets */ 612 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 613 return; 614 615 /* 616 * Enable a consistency check between the destination address 617 * and the arrival interface for a unicast packet (the RFC 1122 618 * strong ES model) if IP forwarding is disabled and the packet 619 * is not locally generated. 620 * 621 * XXX - Checking also should be disabled if the destination 622 * address is ipnat'ed to a different interface. 623 * 624 * XXX - Checking is incompatible with IP aliases added 625 * to the loopback interface instead of the interface where 626 * the packets are received. 627 * 628 * XXX - We need to add a per ifaddr flag for this so that 629 * we get finer grain control. 630 */ 631 checkif = ip_checkinterface && (ipforwarding == 0) && 632 (m->m_pkthdr.rcvif != NULL) && 633 ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0); 634 635 /* 636 * Check our list of addresses, to see if the packet is for us. 637 * 638 * Traditional 4.4BSD did not consult IFF_UP at all. 639 * The behavior here is to treat addresses on !IFF_UP interface 640 * as not mine. 641 */ 642 downmatch = 0; 643 LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 644 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 645 if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif) 646 continue; 647 if ((ia->ia_ifp->if_flags & IFF_UP) != 0) 648 break; 649 else 650 downmatch++; 651 } 652 } 653 if (ia != NULL) 654 goto ours; 655 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { 656 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 657 if (ifa->ifa_addr->sa_family != AF_INET) 658 continue; 659 ia = ifatoia(ifa); 660 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 661 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 662 /* 663 * Look for all-0's host part (old broadcast addr), 664 * either for subnet or net. 665 */ 666 ip->ip_dst.s_addr == ia->ia_subnet || 667 ip->ip_dst.s_addr == ia->ia_net) 668 goto ours; 669 /* 670 * An interface with IP address zero accepts 671 * all packets that arrive on that interface. 672 */ 673 if (in_nullhost(ia->ia_addr.sin_addr)) 674 goto ours; 675 } 676 } 677 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 678 struct in_multi *inm; 679#ifdef MROUTING 680 extern struct socket *ip_mrouter; 681 682 if (ip_mrouter) { 683 /* 684 * If we are acting as a multicast router, all 685 * incoming multicast packets are passed to the 686 * kernel-level multicast forwarding function. 687 * The packet is returned (relatively) intact; if 688 * ip_mforward() returns a non-zero value, the packet 689 * must be discarded, else it may be accepted below. 690 * 691 * (The IP ident field is put in the same byte order 692 * as expected when ip_mforward() is called from 693 * ip_output().) 694 */ 695 if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { 696 IP_STATINC(IP_STAT_CANTFORWARD); 697 m_freem(m); 698 return; 699 } 700 701 /* 702 * The process-level routing demon needs to receive 703 * all multicast IGMP packets, whether or not this 704 * host belongs to their destination groups. 705 */ 706 if (ip->ip_p == IPPROTO_IGMP) 707 goto ours; 708 IP_STATINC(IP_STAT_CANTFORWARD); 709 } 710#endif 711 /* 712 * See if we belong to the destination multicast group on the 713 * arrival interface. 714 */ 715 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 716 if (inm == NULL) { 717 IP_STATINC(IP_STAT_CANTFORWARD); 718 m_freem(m); 719 return; 720 } 721 goto ours; 722 } 723 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 724 in_nullhost(ip->ip_dst)) 725 goto ours; 726 727 /* 728 * Not for us; forward if possible and desirable. 729 */ 730 if (ipforwarding == 0) { 731 IP_STATINC(IP_STAT_CANTFORWARD); 732 m_freem(m); 733 } else { 734 /* 735 * If ip_dst matched any of my address on !IFF_UP interface, 736 * and there's no IFF_UP interface that matches ip_dst, 737 * send icmp unreach. Forwarding it will result in in-kernel 738 * forwarding loop till TTL goes to 0. 739 */ 740 if (downmatch) { 741 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 742 IP_STATINC(IP_STAT_CANTFORWARD); 743 return; 744 } 745#ifdef IPSEC 746 if (ipsec4_in_reject(m, NULL)) { 747 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 748 goto bad; 749 } 750#endif 751#ifdef FAST_IPSEC 752 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 753 s = splsoftnet(); 754 if (mtag != NULL) { 755 tdbi = (struct tdb_ident *)(mtag + 1); 756 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 757 } else { 758 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 759 IP_FORWARDING, &error); 760 } 761 if (sp == NULL) { /* NB: can happen if error */ 762 splx(s); 763 /*XXX error stat???*/ 764 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/ 765 goto bad; 766 } 767 768 /* 769 * Check security policy against packet attributes. 770 */ 771 error = ipsec_in_reject(sp, m); 772 KEY_FREESP(&sp); 773 splx(s); 774 if (error) { 775 IP_STATINC(IP_STAT_CANTFORWARD); 776 goto bad; 777 } 778 779 /* 780 * Peek at the outbound SP for this packet to determine if 781 * it's a Fast Forward candidate. 782 */ 783 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 784 if (mtag != NULL) 785 m->m_flags &= ~M_CANFASTFWD; 786 else { 787 s = splsoftnet(); 788 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, 789 (IP_FORWARDING | 790 (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 791 &error, NULL); 792 if (sp != NULL) { 793 m->m_flags &= ~M_CANFASTFWD; 794 KEY_FREESP(&sp); 795 } 796 splx(s); 797 } 798#endif /* FAST_IPSEC */ 799 800 ip_forward(m, srcrt); 801 } 802 return; 803 804ours: 805 /* 806 * If offset or IP_MF are set, must reassemble. 807 */ 808 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 809 /* 810 * Pass to IP reassembly mechanism. 811 */ 812 if (ip_reass_packet(&m, ip) != 0) { 813 /* Failed; invalid fragment(s) or packet. */ 814 goto bad; 815 } 816 if (m == NULL) { 817 /* More fragments should come; silently return. */ 818 return; 819 } 820 /* 821 * Reassembly is done, we have the final packet. 822 * Updated cached data in local variable(s). 823 */ 824 ip = mtod(m, struct ip *); 825 hlen = ip->ip_hl << 2; 826 } 827 828#if defined(IPSEC) 829 /* 830 * enforce IPsec policy checking if we are seeing last header. 831 * note that we do not visit this with protocols with pcb layer 832 * code - like udp/tcp/raw ip. 833 */ 834 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 && 835 ipsec4_in_reject(m, NULL)) { 836 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 837 goto bad; 838 } 839#endif 840#ifdef FAST_IPSEC 841 /* 842 * enforce IPsec policy checking if we are seeing last header. 843 * note that we do not visit this with protocols with pcb layer 844 * code - like udp/tcp/raw ip. 845 */ 846 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { 847 /* 848 * Check if the packet has already had IPsec processing 849 * done. If so, then just pass it along. This tag gets 850 * set during AH, ESP, etc. input handling, before the 851 * packet is returned to the ip input queue for delivery. 852 */ 853 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 854 s = splsoftnet(); 855 if (mtag != NULL) { 856 tdbi = (struct tdb_ident *)(mtag + 1); 857 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 858 } else { 859 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 860 IP_FORWARDING, &error); 861 } 862 if (sp != NULL) { 863 /* 864 * Check security policy against packet attributes. 865 */ 866 error = ipsec_in_reject(sp, m); 867 KEY_FREESP(&sp); 868 } else { 869 /* XXX error stat??? */ 870 error = EINVAL; 871DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/ 872 } 873 splx(s); 874 if (error) 875 goto bad; 876 } 877#endif /* FAST_IPSEC */ 878 879 /* 880 * Switch out to protocol's input routine. 881 */ 882#if IFA_STATS 883 if (ia && ip) 884 ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 885#endif 886 IP_STATINC(IP_STAT_DELIVERED); 887 { 888 int off = hlen, nh = ip->ip_p; 889 890 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 891 return; 892 } 893bad: 894 m_freem(m); 895 return; 896 897badcsum: 898 IP_STATINC(IP_STAT_BADSUM); 899 m_freem(m); 900} 901 902/* 903 * IP timer processing. 904 */ 905void 906ip_slowtimo(void) 907{ 908 909 mutex_enter(softnet_lock); 910 KERNEL_LOCK(1, NULL); 911 912 ip_reass_slowtimo(); 913 914 KERNEL_UNLOCK_ONE(NULL); 915 mutex_exit(softnet_lock); 916} 917 918/* 919 * IP drain processing. 920 */ 921void 922ip_drain(void) 923{ 924 925 KERNEL_LOCK(1, NULL); 926 ip_reass_drain(); 927 KERNEL_UNLOCK_ONE(NULL); 928} 929 930/* 931 * Do option processing on a datagram, 932 * possibly discarding it if bad options are encountered, 933 * or forwarding it if source-routed. 934 * Returns 1 if packet has been forwarded/freed, 935 * 0 if the packet should be processed further. 936 */ 937int 938ip_dooptions(struct mbuf *m) 939{ 940 struct ip *ip = mtod(m, struct ip *); 941 u_char *cp, *cp0; 942 struct ip_timestamp *ipt; 943 struct in_ifaddr *ia; 944 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 945 struct in_addr dst; 946 n_time ntime; 947 948 dst = ip->ip_dst; 949 cp = (u_char *)(ip + 1); 950 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 951 for (; cnt > 0; cnt -= optlen, cp += optlen) { 952 opt = cp[IPOPT_OPTVAL]; 953 if (opt == IPOPT_EOL) 954 break; 955 if (opt == IPOPT_NOP) 956 optlen = 1; 957 else { 958 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 959 code = &cp[IPOPT_OLEN] - (u_char *)ip; 960 goto bad; 961 } 962 optlen = cp[IPOPT_OLEN]; 963 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 964 code = &cp[IPOPT_OLEN] - (u_char *)ip; 965 goto bad; 966 } 967 } 968 switch (opt) { 969 970 default: 971 break; 972 973 /* 974 * Source routing with record. 975 * Find interface with current destination address. 976 * If none on this machine then drop if strictly routed, 977 * or do nothing if loosely routed. 978 * Record interface address and bring up next address 979 * component. If strictly routed make sure next 980 * address is on directly accessible net. 981 */ 982 case IPOPT_LSRR: 983 case IPOPT_SSRR: 984 if (ip_allowsrcrt == 0) { 985 type = ICMP_UNREACH; 986 code = ICMP_UNREACH_NET_PROHIB; 987 goto bad; 988 } 989 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 990 code = &cp[IPOPT_OLEN] - (u_char *)ip; 991 goto bad; 992 } 993 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 994 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 995 goto bad; 996 } 997 ipaddr.sin_addr = ip->ip_dst; 998 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 999 if (ia == 0) { 1000 if (opt == IPOPT_SSRR) { 1001 type = ICMP_UNREACH; 1002 code = ICMP_UNREACH_SRCFAIL; 1003 goto bad; 1004 } 1005 /* 1006 * Loose routing, and not at next destination 1007 * yet; nothing to do except forward. 1008 */ 1009 break; 1010 } 1011 off--; /* 0 origin */ 1012 if ((off + sizeof(struct in_addr)) > optlen) { 1013 /* 1014 * End of source route. Should be for us. 1015 */ 1016 save_rte(cp, ip->ip_src); 1017 break; 1018 } 1019 /* 1020 * locate outgoing interface 1021 */ 1022 memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), 1023 sizeof(ipaddr.sin_addr)); 1024 if (opt == IPOPT_SSRR) 1025 ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr))); 1026 else 1027 ia = ip_rtaddr(ipaddr.sin_addr); 1028 if (ia == 0) { 1029 type = ICMP_UNREACH; 1030 code = ICMP_UNREACH_SRCFAIL; 1031 goto bad; 1032 } 1033 ip->ip_dst = ipaddr.sin_addr; 1034 bcopy((void *)&ia->ia_addr.sin_addr, 1035 (void *)(cp + off), sizeof(struct in_addr)); 1036 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1037 /* 1038 * Let ip_intr's mcast routing check handle mcast pkts 1039 */ 1040 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 1041 break; 1042 1043 case IPOPT_RR: 1044 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1045 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1046 goto bad; 1047 } 1048 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1049 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1050 goto bad; 1051 } 1052 /* 1053 * If no space remains, ignore. 1054 */ 1055 off--; /* 0 origin */ 1056 if ((off + sizeof(struct in_addr)) > optlen) 1057 break; 1058 memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst), 1059 sizeof(ipaddr.sin_addr)); 1060 /* 1061 * locate outgoing interface; if we're the destination, 1062 * use the incoming interface (should be same). 1063 */ 1064 if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))) 1065 == NULL && 1066 (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) { 1067 type = ICMP_UNREACH; 1068 code = ICMP_UNREACH_HOST; 1069 goto bad; 1070 } 1071 bcopy((void *)&ia->ia_addr.sin_addr, 1072 (void *)(cp + off), sizeof(struct in_addr)); 1073 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1074 break; 1075 1076 case IPOPT_TS: 1077 code = cp - (u_char *)ip; 1078 ipt = (struct ip_timestamp *)cp; 1079 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1080 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1081 goto bad; 1082 } 1083 if (ipt->ipt_ptr < 5) { 1084 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1085 goto bad; 1086 } 1087 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 1088 if (++ipt->ipt_oflw == 0) { 1089 code = (u_char *)&ipt->ipt_ptr - 1090 (u_char *)ip; 1091 goto bad; 1092 } 1093 break; 1094 } 1095 cp0 = (cp + ipt->ipt_ptr - 1); 1096 switch (ipt->ipt_flg) { 1097 1098 case IPOPT_TS_TSONLY: 1099 break; 1100 1101 case IPOPT_TS_TSANDADDR: 1102 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1103 sizeof(struct in_addr) > ipt->ipt_len) { 1104 code = (u_char *)&ipt->ipt_ptr - 1105 (u_char *)ip; 1106 goto bad; 1107 } 1108 ipaddr.sin_addr = dst; 1109 ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr), 1110 m->m_pkthdr.rcvif)); 1111 if (ia == 0) 1112 continue; 1113 bcopy(&ia->ia_addr.sin_addr, 1114 cp0, sizeof(struct in_addr)); 1115 ipt->ipt_ptr += sizeof(struct in_addr); 1116 break; 1117 1118 case IPOPT_TS_PRESPEC: 1119 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1120 sizeof(struct in_addr) > ipt->ipt_len) { 1121 code = (u_char *)&ipt->ipt_ptr - 1122 (u_char *)ip; 1123 goto bad; 1124 } 1125 memcpy(&ipaddr.sin_addr, cp0, 1126 sizeof(struct in_addr)); 1127 if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))) 1128 == NULL) 1129 continue; 1130 ipt->ipt_ptr += sizeof(struct in_addr); 1131 break; 1132 1133 default: 1134 /* XXX can't take &ipt->ipt_flg */ 1135 code = (u_char *)&ipt->ipt_ptr - 1136 (u_char *)ip + 1; 1137 goto bad; 1138 } 1139 ntime = iptime(); 1140 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1141 memmove((char *)cp + ipt->ipt_ptr - 1, cp0, 1142 sizeof(n_time)); 1143 ipt->ipt_ptr += sizeof(n_time); 1144 } 1145 } 1146 if (forward) { 1147 if (ip_forwsrcrt == 0) { 1148 type = ICMP_UNREACH; 1149 code = ICMP_UNREACH_SRCFAIL; 1150 goto bad; 1151 } 1152 ip_forward(m, 1); 1153 return (1); 1154 } 1155 return (0); 1156bad: 1157 icmp_error(m, type, code, 0, 0); 1158 IP_STATINC(IP_STAT_BADOPTIONS); 1159 return (1); 1160} 1161 1162/* 1163 * Given address of next destination (final or next hop), 1164 * return internet address info of interface to be used to get there. 1165 */ 1166struct in_ifaddr * 1167ip_rtaddr(struct in_addr dst) 1168{ 1169 struct rtentry *rt; 1170 union { 1171 struct sockaddr dst; 1172 struct sockaddr_in dst4; 1173 } u; 1174 1175 sockaddr_in_init(&u.dst4, &dst, 0); 1176 1177 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) 1178 return NULL; 1179 1180 return ifatoia(rt->rt_ifa); 1181} 1182 1183/* 1184 * Save incoming source route for use in replies, 1185 * to be picked up later by ip_srcroute if the receiver is interested. 1186 */ 1187void 1188save_rte(u_char *option, struct in_addr dst) 1189{ 1190 unsigned olen; 1191 1192 olen = option[IPOPT_OLEN]; 1193#ifdef DIAGNOSTIC 1194 if (ipprintfs) 1195 printf("save_rte: olen %d\n", olen); 1196#endif /* 0 */ 1197 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1198 return; 1199 memcpy((void *)ip_srcrt.srcopt, (void *)option, olen); 1200 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1201 ip_srcrt.dst = dst; 1202} 1203 1204/* 1205 * Retrieve incoming source route for use in replies, 1206 * in the same form used by setsockopt. 1207 * The first hop is placed before the options, will be removed later. 1208 */ 1209struct mbuf * 1210ip_srcroute(void) 1211{ 1212 struct in_addr *p, *q; 1213 struct mbuf *m; 1214 1215 if (ip_nhops == 0) 1216 return NULL; 1217 m = m_get(M_DONTWAIT, MT_SOOPTS); 1218 if (m == 0) 1219 return NULL; 1220 1221 MCLAIM(m, &inetdomain.dom_mowner); 1222#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1223 1224 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1225 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1226 OPTSIZ; 1227#ifdef DIAGNOSTIC 1228 if (ipprintfs) 1229 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1230#endif 1231 1232 /* 1233 * First save first hop for return route 1234 */ 1235 p = &ip_srcrt.route[ip_nhops - 1]; 1236 *(mtod(m, struct in_addr *)) = *p--; 1237#ifdef DIAGNOSTIC 1238 if (ipprintfs) 1239 printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr)); 1240#endif 1241 1242 /* 1243 * Copy option fields and padding (nop) to mbuf. 1244 */ 1245 ip_srcrt.nop = IPOPT_NOP; 1246 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1247 memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop, 1248 OPTSIZ); 1249 q = (struct in_addr *)(mtod(m, char *) + 1250 sizeof(struct in_addr) + OPTSIZ); 1251#undef OPTSIZ 1252 /* 1253 * Record return path as an IP source route, 1254 * reversing the path (pointers are now aligned). 1255 */ 1256 while (p >= ip_srcrt.route) { 1257#ifdef DIAGNOSTIC 1258 if (ipprintfs) 1259 printf(" %x", ntohl(q->s_addr)); 1260#endif 1261 *q++ = *p--; 1262 } 1263 /* 1264 * Last hop goes to final destination. 1265 */ 1266 *q = ip_srcrt.dst; 1267#ifdef DIAGNOSTIC 1268 if (ipprintfs) 1269 printf(" %x\n", ntohl(q->s_addr)); 1270#endif 1271 return (m); 1272} 1273 1274const int inetctlerrmap[PRC_NCMDS] = { 1275 [PRC_MSGSIZE] = EMSGSIZE, 1276 [PRC_HOSTDEAD] = EHOSTDOWN, 1277 [PRC_HOSTUNREACH] = EHOSTUNREACH, 1278 [PRC_UNREACH_NET] = EHOSTUNREACH, 1279 [PRC_UNREACH_HOST] = EHOSTUNREACH, 1280 [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, 1281 [PRC_UNREACH_PORT] = ECONNREFUSED, 1282 [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, 1283 [PRC_PARAMPROB] = ENOPROTOOPT, 1284}; 1285 1286/* 1287 * Forward a packet. If some error occurs return the sender 1288 * an icmp packet. Note we can't always generate a meaningful 1289 * icmp message because icmp doesn't have a large enough repertoire 1290 * of codes and types. 1291 * 1292 * If not forwarding, just drop the packet. This could be confusing 1293 * if ipforwarding was zero but some routing protocol was advancing 1294 * us as a gateway to somewhere. However, we must let the routing 1295 * protocol deal with that. 1296 * 1297 * The srcrt parameter indicates whether the packet is being forwarded 1298 * via a source route. 1299 */ 1300void 1301ip_forward(struct mbuf *m, int srcrt) 1302{ 1303 struct ip *ip = mtod(m, struct ip *); 1304 struct rtentry *rt; 1305 int error, type = 0, code = 0, destmtu = 0; 1306 struct mbuf *mcopy; 1307 n_long dest; 1308 union { 1309 struct sockaddr dst; 1310 struct sockaddr_in dst4; 1311 } u; 1312 1313 /* 1314 * We are now in the output path. 1315 */ 1316 MCLAIM(m, &ip_tx_mowner); 1317 1318 /* 1319 * Clear any in-bound checksum flags for this packet. 1320 */ 1321 m->m_pkthdr.csum_flags = 0; 1322 1323 dest = 0; 1324#ifdef DIAGNOSTIC 1325 if (ipprintfs) { 1326 printf("forward: src %s ", inet_ntoa(ip->ip_src)); 1327 printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl); 1328 } 1329#endif 1330 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1331 IP_STATINC(IP_STAT_CANTFORWARD); 1332 m_freem(m); 1333 return; 1334 } 1335 if (ip->ip_ttl <= IPTTLDEC) { 1336 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1337 return; 1338 } 1339 1340 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1341 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) { 1342 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); 1343 return; 1344 } 1345 1346 /* 1347 * Save at most 68 bytes of the packet in case 1348 * we need to generate an ICMP message to the src. 1349 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1350 */ 1351 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1352 if (mcopy) 1353 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1354 1355 ip->ip_ttl -= IPTTLDEC; 1356 1357 /* 1358 * If forwarding packet using same interface that it came in on, 1359 * perhaps should send a redirect to sender to shortcut a hop. 1360 * Only send redirect if source is sending directly to us, 1361 * and if packet was not source routed (or has any options). 1362 * Also, don't send redirect if forwarding using a default route 1363 * or a route modified by a redirect. 1364 */ 1365 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1366 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1367 !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && 1368 ipsendredirects && !srcrt) { 1369 if (rt->rt_ifa && 1370 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1371 ifatoia(rt->rt_ifa)->ia_subnet) { 1372 if (rt->rt_flags & RTF_GATEWAY) 1373 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1374 else 1375 dest = ip->ip_dst.s_addr; 1376 /* 1377 * Router requirements says to only send host 1378 * redirects. 1379 */ 1380 type = ICMP_REDIRECT; 1381 code = ICMP_REDIRECT_HOST; 1382#ifdef DIAGNOSTIC 1383 if (ipprintfs) 1384 printf("redirect (%d) to %x\n", code, 1385 (u_int32_t)dest); 1386#endif 1387 } 1388 } 1389 1390 error = ip_output(m, NULL, &ipforward_rt, 1391 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 1392 (struct ip_moptions *)NULL, (struct socket *)NULL); 1393 1394 if (error) 1395 IP_STATINC(IP_STAT_CANTFORWARD); 1396 else { 1397 uint64_t *ips = IP_STAT_GETREF(); 1398 ips[IP_STAT_FORWARD]++; 1399 if (type) { 1400 ips[IP_STAT_REDIRECTSENT]++; 1401 IP_STAT_PUTREF(); 1402 } else { 1403 IP_STAT_PUTREF(); 1404 if (mcopy) { 1405#ifdef GATEWAY 1406 if (mcopy->m_flags & M_CANFASTFWD) 1407 ipflow_create(&ipforward_rt, mcopy); 1408#endif 1409 m_freem(mcopy); 1410 } 1411 return; 1412 } 1413 } 1414 if (mcopy == NULL) 1415 return; 1416 1417 switch (error) { 1418 1419 case 0: /* forwarded, but need redirect */ 1420 /* type, code set above */ 1421 break; 1422 1423 case ENETUNREACH: /* shouldn't happen, checked above */ 1424 case EHOSTUNREACH: 1425 case ENETDOWN: 1426 case EHOSTDOWN: 1427 default: 1428 type = ICMP_UNREACH; 1429 code = ICMP_UNREACH_HOST; 1430 break; 1431 1432 case EMSGSIZE: 1433 type = ICMP_UNREACH; 1434 code = ICMP_UNREACH_NEEDFRAG; 1435 1436 if ((rt = rtcache_validate(&ipforward_rt)) != NULL) 1437 destmtu = rt->rt_ifp->if_mtu; 1438 1439#if defined(IPSEC) || defined(FAST_IPSEC) 1440 { 1441 /* 1442 * If the packet is routed over IPsec tunnel, tell the 1443 * originator the tunnel MTU. 1444 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 1445 * XXX quickhack!!! 1446 */ 1447 1448 struct secpolicy *sp; 1449 int ipsecerror; 1450 size_t ipsechdr; 1451 struct route *ro; 1452 1453 sp = ipsec4_getpolicybyaddr(mcopy, 1454 IPSEC_DIR_OUTBOUND, IP_FORWARDING, 1455 &ipsecerror); 1456 1457 if (sp != NULL) { 1458 /* count IPsec header size */ 1459 ipsechdr = ipsec4_hdrsiz(mcopy, 1460 IPSEC_DIR_OUTBOUND, NULL); 1461 1462 /* 1463 * find the correct route for outer IPv4 1464 * header, compute tunnel MTU. 1465 */ 1466 1467 if (sp->req != NULL 1468 && sp->req->sav != NULL 1469 && sp->req->sav->sah != NULL) { 1470 ro = &sp->req->sav->sah->sa_route; 1471 rt = rtcache_validate(ro); 1472 if (rt && rt->rt_ifp) { 1473 destmtu = 1474 rt->rt_rmx.rmx_mtu ? 1475 rt->rt_rmx.rmx_mtu : 1476 rt->rt_ifp->if_mtu; 1477 destmtu -= ipsechdr; 1478 } 1479 } 1480 1481#ifdef IPSEC 1482 key_freesp(sp); 1483#else 1484 KEY_FREESP(&sp); 1485#endif 1486 } 1487 } 1488#endif /*defined(IPSEC) || defined(FAST_IPSEC)*/ 1489 IP_STATINC(IP_STAT_CANTFRAG); 1490 break; 1491 1492 case ENOBUFS: 1493#if 1 1494 /* 1495 * a router should not generate ICMP_SOURCEQUENCH as 1496 * required in RFC1812 Requirements for IP Version 4 Routers. 1497 * source quench could be a big problem under DoS attacks, 1498 * or if the underlying interface is rate-limited. 1499 */ 1500 if (mcopy) 1501 m_freem(mcopy); 1502 return; 1503#else 1504 type = ICMP_SOURCEQUENCH; 1505 code = 0; 1506 break; 1507#endif 1508 } 1509 icmp_error(mcopy, type, code, dest, destmtu); 1510} 1511 1512void 1513ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1514 struct mbuf *m) 1515{ 1516 1517 if (inp->inp_socket->so_options & SO_TIMESTAMP 1518#ifdef SO_OTIMESTAMP 1519 || inp->inp_socket->so_options & SO_OTIMESTAMP 1520#endif 1521 ) { 1522 struct timeval tv; 1523 1524 microtime(&tv); 1525#ifdef SO_OTIMESTAMP 1526 if (inp->inp_socket->so_options & SO_OTIMESTAMP) { 1527 struct timeval50 tv50; 1528 timeval_to_timeval50(&tv, &tv50); 1529 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1530 SCM_OTIMESTAMP, SOL_SOCKET); 1531 } else 1532#endif 1533 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1534 SCM_TIMESTAMP, SOL_SOCKET); 1535 if (*mp) 1536 mp = &(*mp)->m_next; 1537 } 1538 if (inp->inp_flags & INP_RECVDSTADDR) { 1539 *mp = sbcreatecontrol((void *) &ip->ip_dst, 1540 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1541 if (*mp) 1542 mp = &(*mp)->m_next; 1543 } 1544#ifdef notyet 1545 /* 1546 * XXX 1547 * Moving these out of udp_input() made them even more broken 1548 * than they already were. 1549 * - fenner@parc.xerox.com 1550 */ 1551 /* options were tossed already */ 1552 if (inp->inp_flags & INP_RECVOPTS) { 1553 *mp = sbcreatecontrol((void *) opts_deleted_above, 1554 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1555 if (*mp) 1556 mp = &(*mp)->m_next; 1557 } 1558 /* ip_srcroute doesn't do what we want here, need to fix */ 1559 if (inp->inp_flags & INP_RECVRETOPTS) { 1560 *mp = sbcreatecontrol((void *) ip_srcroute(), 1561 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1562 if (*mp) 1563 mp = &(*mp)->m_next; 1564 } 1565#endif 1566 if (inp->inp_flags & INP_RECVIF) { 1567 struct sockaddr_dl sdl; 1568 1569 sockaddr_dl_init(&sdl, sizeof(sdl), 1570 (m->m_pkthdr.rcvif != NULL) 1571 ? m->m_pkthdr.rcvif->if_index 1572 : 0, 1573 0, NULL, 0, NULL, 0); 1574 *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); 1575 if (*mp) 1576 mp = &(*mp)->m_next; 1577 } 1578 if (inp->inp_flags & INP_RECVTTL) { 1579 *mp = sbcreatecontrol((void *) &ip->ip_ttl, 1580 sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); 1581 if (*mp) 1582 mp = &(*mp)->m_next; 1583 } 1584} 1585 1586/* 1587 * sysctl helper routine for net.inet.ip.forwsrcrt. 1588 */ 1589static int 1590sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) 1591{ 1592 int error, tmp; 1593 struct sysctlnode node; 1594 1595 node = *rnode; 1596 tmp = ip_forwsrcrt; 1597 node.sysctl_data = &tmp; 1598 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1599 if (error || newp == NULL) 1600 return (error); 1601 1602 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, 1603 0, NULL, NULL, NULL); 1604 if (error) 1605 return (error); 1606 1607 ip_forwsrcrt = tmp; 1608 1609 return (0); 1610} 1611 1612/* 1613 * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the 1614 * range of the new value and tweaks timers if it changes. 1615 */ 1616static int 1617sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) 1618{ 1619 int error, tmp; 1620 struct sysctlnode node; 1621 1622 node = *rnode; 1623 tmp = ip_mtudisc_timeout; 1624 node.sysctl_data = &tmp; 1625 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1626 if (error || newp == NULL) 1627 return (error); 1628 if (tmp < 0) 1629 return (EINVAL); 1630 1631 mutex_enter(softnet_lock); 1632 1633 ip_mtudisc_timeout = tmp; 1634 rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); 1635 1636 mutex_exit(softnet_lock); 1637 1638 return (0); 1639} 1640 1641#ifdef GATEWAY 1642/* 1643 * sysctl helper routine for net.inet.ip.maxflows. 1644 */ 1645static int 1646sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS) 1647{ 1648 int error; 1649 1650 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1651 if (error || newp == NULL) 1652 return (error); 1653 1654 mutex_enter(softnet_lock); 1655 KERNEL_LOCK(1, NULL); 1656 1657 ipflow_prune(); 1658 1659 KERNEL_UNLOCK_ONE(NULL); 1660 mutex_exit(softnet_lock); 1661 1662 return (0); 1663} 1664 1665static int 1666sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS) 1667{ 1668 int error, tmp; 1669 struct sysctlnode node; 1670 1671 node = *rnode; 1672 tmp = ip_hashsize; 1673 node.sysctl_data = &tmp; 1674 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1675 if (error || newp == NULL) 1676 return (error); 1677 1678 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1679 /* 1680 * Can only fail due to malloc() 1681 */ 1682 mutex_enter(softnet_lock); 1683 KERNEL_LOCK(1, NULL); 1684 1685 error = ipflow_invalidate_all(tmp); 1686 1687 KERNEL_UNLOCK_ONE(NULL); 1688 mutex_exit(softnet_lock); 1689 1690 } else { 1691 /* 1692 * EINVAL if not a power of 2 1693 */ 1694 error = EINVAL; 1695 } 1696 1697 return error; 1698} 1699#endif /* GATEWAY */ 1700 1701static int 1702sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) 1703{ 1704 1705 return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); 1706} 1707 1708static void 1709sysctl_net_inet_ip_setup(struct sysctllog **clog) 1710{ 1711 extern int subnetsarelocal, hostzeroisbroadcast; 1712 1713 sysctl_createv(clog, 0, NULL, NULL, 1714 CTLFLAG_PERMANENT, 1715 CTLTYPE_NODE, "net", NULL, 1716 NULL, 0, NULL, 0, 1717 CTL_NET, CTL_EOL); 1718 sysctl_createv(clog, 0, NULL, NULL, 1719 CTLFLAG_PERMANENT, 1720 CTLTYPE_NODE, "inet", 1721 SYSCTL_DESCR("PF_INET related settings"), 1722 NULL, 0, NULL, 0, 1723 CTL_NET, PF_INET, CTL_EOL); 1724 sysctl_createv(clog, 0, NULL, NULL, 1725 CTLFLAG_PERMANENT, 1726 CTLTYPE_NODE, "ip", 1727 SYSCTL_DESCR("IPv4 related settings"), 1728 NULL, 0, NULL, 0, 1729 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 1730 1731 sysctl_createv(clog, 0, NULL, NULL, 1732 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1733 CTLTYPE_INT, "forwarding", 1734 SYSCTL_DESCR("Enable forwarding of INET datagrams"), 1735 NULL, 0, &ipforwarding, 0, 1736 CTL_NET, PF_INET, IPPROTO_IP, 1737 IPCTL_FORWARDING, CTL_EOL); 1738 sysctl_createv(clog, 0, NULL, NULL, 1739 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1740 CTLTYPE_INT, "redirect", 1741 SYSCTL_DESCR("Enable sending of ICMP redirect messages"), 1742 NULL, 0, &ipsendredirects, 0, 1743 CTL_NET, PF_INET, IPPROTO_IP, 1744 IPCTL_SENDREDIRECTS, CTL_EOL); 1745 sysctl_createv(clog, 0, NULL, NULL, 1746 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1747 CTLTYPE_INT, "ttl", 1748 SYSCTL_DESCR("Default TTL for an INET datagram"), 1749 NULL, 0, &ip_defttl, 0, 1750 CTL_NET, PF_INET, IPPROTO_IP, 1751 IPCTL_DEFTTL, CTL_EOL); 1752#ifdef IPCTL_DEFMTU 1753 sysctl_createv(clog, 0, NULL, NULL, 1754 CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */, 1755 CTLTYPE_INT, "mtu", 1756 SYSCTL_DESCR("Default MTA for an INET route"), 1757 NULL, 0, &ip_mtu, 0, 1758 CTL_NET, PF_INET, IPPROTO_IP, 1759 IPCTL_DEFMTU, CTL_EOL); 1760#endif /* IPCTL_DEFMTU */ 1761 sysctl_createv(clog, 0, NULL, NULL, 1762 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1763 CTLTYPE_INT, "forwsrcrt", 1764 SYSCTL_DESCR("Enable forwarding of source-routed " 1765 "datagrams"), 1766 sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, 1767 CTL_NET, PF_INET, IPPROTO_IP, 1768 IPCTL_FORWSRCRT, CTL_EOL); 1769 sysctl_createv(clog, 0, NULL, NULL, 1770 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1771 CTLTYPE_INT, "directed-broadcast", 1772 SYSCTL_DESCR("Enable forwarding of broadcast datagrams"), 1773 NULL, 0, &ip_directedbcast, 0, 1774 CTL_NET, PF_INET, IPPROTO_IP, 1775 IPCTL_DIRECTEDBCAST, CTL_EOL); 1776 sysctl_createv(clog, 0, NULL, NULL, 1777 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1778 CTLTYPE_INT, "allowsrcrt", 1779 SYSCTL_DESCR("Accept source-routed datagrams"), 1780 NULL, 0, &ip_allowsrcrt, 0, 1781 CTL_NET, PF_INET, IPPROTO_IP, 1782 IPCTL_ALLOWSRCRT, CTL_EOL); 1783 sysctl_createv(clog, 0, NULL, NULL, 1784 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1785 CTLTYPE_INT, "subnetsarelocal", 1786 SYSCTL_DESCR("Whether logical subnets are considered " 1787 "local"), 1788 NULL, 0, &subnetsarelocal, 0, 1789 CTL_NET, PF_INET, IPPROTO_IP, 1790 IPCTL_SUBNETSARELOCAL, CTL_EOL); 1791 sysctl_createv(clog, 0, NULL, NULL, 1792 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1793 CTLTYPE_INT, "mtudisc", 1794 SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"), 1795 NULL, 0, &ip_mtudisc, 0, 1796 CTL_NET, PF_INET, IPPROTO_IP, 1797 IPCTL_MTUDISC, CTL_EOL); 1798 sysctl_createv(clog, 0, NULL, NULL, 1799 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1800 CTLTYPE_INT, "anonportmin", 1801 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1802 sysctl_net_inet_ip_ports, 0, &anonportmin, 0, 1803 CTL_NET, PF_INET, IPPROTO_IP, 1804 IPCTL_ANONPORTMIN, CTL_EOL); 1805 sysctl_createv(clog, 0, NULL, NULL, 1806 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1807 CTLTYPE_INT, "anonportmax", 1808 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1809 sysctl_net_inet_ip_ports, 0, &anonportmax, 0, 1810 CTL_NET, PF_INET, IPPROTO_IP, 1811 IPCTL_ANONPORTMAX, CTL_EOL); 1812 sysctl_createv(clog, 0, NULL, NULL, 1813 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1814 CTLTYPE_INT, "mtudisctimeout", 1815 SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"), 1816 sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0, 1817 CTL_NET, PF_INET, IPPROTO_IP, 1818 IPCTL_MTUDISCTIMEOUT, CTL_EOL); 1819#ifdef GATEWAY 1820 sysctl_createv(clog, 0, NULL, NULL, 1821 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1822 CTLTYPE_INT, "maxflows", 1823 SYSCTL_DESCR("Number of flows for fast forwarding"), 1824 sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0, 1825 CTL_NET, PF_INET, IPPROTO_IP, 1826 IPCTL_MAXFLOWS, CTL_EOL); 1827 sysctl_createv(clog, 0, NULL, NULL, 1828 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1829 CTLTYPE_INT, "hashsize", 1830 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"), 1831 sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0, 1832 CTL_NET, PF_INET, IPPROTO_IP, 1833 CTL_CREATE, CTL_EOL); 1834#endif /* GATEWAY */ 1835 sysctl_createv(clog, 0, NULL, NULL, 1836 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1837 CTLTYPE_INT, "hostzerobroadcast", 1838 SYSCTL_DESCR("All zeroes address is broadcast address"), 1839 NULL, 0, &hostzeroisbroadcast, 0, 1840 CTL_NET, PF_INET, IPPROTO_IP, 1841 IPCTL_HOSTZEROBROADCAST, CTL_EOL); 1842#if NGIF > 0 1843 sysctl_createv(clog, 0, NULL, NULL, 1844 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1845 CTLTYPE_INT, "gifttl", 1846 SYSCTL_DESCR("Default TTL for a gif tunnel datagram"), 1847 NULL, 0, &ip_gif_ttl, 0, 1848 CTL_NET, PF_INET, IPPROTO_IP, 1849 IPCTL_GIF_TTL, CTL_EOL); 1850#endif /* NGIF */ 1851#ifndef IPNOPRIVPORTS 1852 sysctl_createv(clog, 0, NULL, NULL, 1853 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1854 CTLTYPE_INT, "lowportmin", 1855 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1856 "to assign"), 1857 sysctl_net_inet_ip_ports, 0, &lowportmin, 0, 1858 CTL_NET, PF_INET, IPPROTO_IP, 1859 IPCTL_LOWPORTMIN, CTL_EOL); 1860 sysctl_createv(clog, 0, NULL, NULL, 1861 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1862 CTLTYPE_INT, "lowportmax", 1863 SYSCTL_DESCR("Highest privileged ephemeral port number " 1864 "to assign"), 1865 sysctl_net_inet_ip_ports, 0, &lowportmax, 0, 1866 CTL_NET, PF_INET, IPPROTO_IP, 1867 IPCTL_LOWPORTMAX, CTL_EOL); 1868#endif /* IPNOPRIVPORTS */ 1869#if NGRE > 0 1870 sysctl_createv(clog, 0, NULL, NULL, 1871 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1872 CTLTYPE_INT, "grettl", 1873 SYSCTL_DESCR("Default TTL for a gre tunnel datagram"), 1874 NULL, 0, &ip_gre_ttl, 0, 1875 CTL_NET, PF_INET, IPPROTO_IP, 1876 IPCTL_GRE_TTL, CTL_EOL); 1877#endif /* NGRE */ 1878 sysctl_createv(clog, 0, NULL, NULL, 1879 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1880 CTLTYPE_INT, "checkinterface", 1881 SYSCTL_DESCR("Enable receive side of Strong ES model " 1882 "from RFC1122"), 1883 NULL, 0, &ip_checkinterface, 0, 1884 CTL_NET, PF_INET, IPPROTO_IP, 1885 IPCTL_CHECKINTERFACE, CTL_EOL); 1886 sysctl_createv(clog, 0, NULL, NULL, 1887 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1888 CTLTYPE_INT, "random_id", 1889 SYSCTL_DESCR("Assign random ip_id values"), 1890 NULL, 0, &ip_do_randomid, 0, 1891 CTL_NET, PF_INET, IPPROTO_IP, 1892 IPCTL_RANDOMID, CTL_EOL); 1893 sysctl_createv(clog, 0, NULL, NULL, 1894 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1895 CTLTYPE_INT, "do_loopback_cksum", 1896 SYSCTL_DESCR("Perform IP checksum on loopback"), 1897 NULL, 0, &ip_do_loopback_cksum, 0, 1898 CTL_NET, PF_INET, IPPROTO_IP, 1899 IPCTL_LOOPBACKCKSUM, CTL_EOL); 1900 sysctl_createv(clog, 0, NULL, NULL, 1901 CTLFLAG_PERMANENT, 1902 CTLTYPE_STRUCT, "stats", 1903 SYSCTL_DESCR("IP statistics"), 1904 sysctl_net_inet_ip_stats, 0, NULL, 0, 1905 CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, 1906 CTL_EOL); 1907} 1908 1909void 1910ip_statinc(u_int stat) 1911{ 1912 1913 KASSERT(stat < IP_NSTATS); 1914 IP_STATINC(stat); 1915} 1916