ip_input.c revision 1.166
1/* $NetBSD: ip_input.c,v 1.166 2003/06/15 02:49:33 matt 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 * 3. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed by the NetBSD 51 * Foundation, Inc. and its contributors. 52 * 4. Neither the name of The NetBSD Foundation nor the names of its 53 * contributors may be used to endorse or promote products derived 54 * from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 57 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 58 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 59 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 60 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 61 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 62 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 63 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 64 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 65 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 */ 68 69/* 70 * Copyright (c) 1982, 1986, 1988, 1993 71 * The Regents of the University of California. All rights reserved. 72 * 73 * Redistribution and use in source and binary forms, with or without 74 * modification, are permitted provided that the following conditions 75 * are met: 76 * 1. Redistributions of source code must retain the above copyright 77 * notice, this list of conditions and the following disclaimer. 78 * 2. Redistributions in binary form must reproduce the above copyright 79 * notice, this list of conditions and the following disclaimer in the 80 * documentation and/or other materials provided with the distribution. 81 * 3. All advertising materials mentioning features or use of this software 82 * must display the following acknowledgement: 83 * This product includes software developed by the University of 84 * California, Berkeley and its contributors. 85 * 4. Neither the name of the University nor the names of its contributors 86 * may be used to endorse or promote products derived from this software 87 * without specific prior written permission. 88 * 89 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 90 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 91 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 92 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 93 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 94 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 95 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 96 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 97 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 98 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 99 * SUCH DAMAGE. 100 * 101 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 102 */ 103 104#include <sys/cdefs.h> 105__KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.166 2003/06/15 02:49:33 matt Exp $"); 106 107#include "opt_gateway.h" 108#include "opt_pfil_hooks.h" 109#include "opt_ipsec.h" 110#include "opt_mrouting.h" 111#include "opt_inet_csum.h" 112 113#include <sys/param.h> 114#include <sys/systm.h> 115#include <sys/malloc.h> 116#include <sys/mbuf.h> 117#include <sys/domain.h> 118#include <sys/protosw.h> 119#include <sys/socket.h> 120#include <sys/socketvar.h> 121#include <sys/errno.h> 122#include <sys/time.h> 123#include <sys/kernel.h> 124#include <sys/pool.h> 125#include <sys/sysctl.h> 126 127#include <net/if.h> 128#include <net/if_dl.h> 129#include <net/route.h> 130#include <net/pfil.h> 131 132#include <netinet/in.h> 133#include <netinet/in_systm.h> 134#include <netinet/ip.h> 135#include <netinet/in_pcb.h> 136#include <netinet/in_var.h> 137#include <netinet/ip_var.h> 138#include <netinet/ip_icmp.h> 139/* just for gif_ttl */ 140#include <netinet/in_gif.h> 141#include "gif.h" 142#include <net/if_gre.h> 143#include "gre.h" 144 145#ifdef MROUTING 146#include <netinet/ip_mroute.h> 147#endif 148 149#ifdef IPSEC 150#include <netinet6/ipsec.h> 151#include <netkey/key.h> 152#endif 153 154#ifndef IPFORWARDING 155#ifdef GATEWAY 156#define IPFORWARDING 1 /* forward IP packets not for us */ 157#else /* GATEWAY */ 158#define IPFORWARDING 0 /* don't forward IP packets not for us */ 159#endif /* GATEWAY */ 160#endif /* IPFORWARDING */ 161#ifndef IPSENDREDIRECTS 162#define IPSENDREDIRECTS 1 163#endif 164#ifndef IPFORWSRCRT 165#define IPFORWSRCRT 1 /* forward source-routed packets */ 166#endif 167#ifndef IPALLOWSRCRT 168#define IPALLOWSRCRT 1 /* allow source-routed packets */ 169#endif 170#ifndef IPMTUDISC 171#define IPMTUDISC 1 172#endif 173#ifndef IPMTUDISCTIMEOUT 174#define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 175#endif 176 177/* 178 * Note: DIRECTED_BROADCAST is handled this way so that previous 179 * configuration using this option will Just Work. 180 */ 181#ifndef IPDIRECTEDBCAST 182#ifdef DIRECTED_BROADCAST 183#define IPDIRECTEDBCAST 1 184#else 185#define IPDIRECTEDBCAST 0 186#endif /* DIRECTED_BROADCAST */ 187#endif /* IPDIRECTEDBCAST */ 188int ipforwarding = IPFORWARDING; 189int ipsendredirects = IPSENDREDIRECTS; 190int ip_defttl = IPDEFTTL; 191int ip_forwsrcrt = IPFORWSRCRT; 192int ip_directedbcast = IPDIRECTEDBCAST; 193int ip_allowsrcrt = IPALLOWSRCRT; 194int ip_mtudisc = IPMTUDISC; 195int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; 196#ifdef DIAGNOSTIC 197int ipprintfs = 0; 198#endif 199/* 200 * XXX - Setting ip_checkinterface mostly implements the receive side of 201 * the Strong ES model described in RFC 1122, but since the routing table 202 * and transmit implementation do not implement the Strong ES model, 203 * setting this to 1 results in an odd hybrid. 204 * 205 * XXX - ip_checkinterface currently must be disabled if you use ipnat 206 * to translate the destination address to another local interface. 207 * 208 * XXX - ip_checkinterface must be disabled if you add IP aliases 209 * to the loopback interface instead of the interface where the 210 * packets for those addresses are received. 211 */ 212int ip_checkinterface = 0; 213 214 215struct rttimer_queue *ip_mtudisc_timeout_q = NULL; 216 217extern struct domain inetdomain; 218int ipqmaxlen = IFQ_MAXLEN; 219u_long in_ifaddrhash; /* size of hash table - 1 */ 220int in_ifaddrentries; /* total number of addrs */ 221struct in_ifaddrhead in_ifaddr; 222struct in_ifaddrhashhead *in_ifaddrhashtbl; 223u_long in_multihash; /* size of hash table - 1 */ 224int in_multientries; /* total number of addrs */ 225struct in_multihead in_multi; 226struct in_multihashhead *in_multihashtbl; 227struct ifqueue ipintrq; 228struct ipstat ipstat; 229u_int16_t ip_id; 230 231#ifdef PFIL_HOOKS 232struct pfil_head inet_pfil_hook; 233#endif 234 235struct ipqhead ipq; 236int ipq_locked; 237int ip_nfragpackets = 0; 238int ip_maxfragpackets = 200; 239 240static __inline int ipq_lock_try __P((void)); 241static __inline void ipq_unlock __P((void)); 242 243static __inline int 244ipq_lock_try() 245{ 246 int s; 247 248 /* 249 * Use splvm() -- we're blocking things that would cause 250 * mbuf allocation. 251 */ 252 s = splvm(); 253 if (ipq_locked) { 254 splx(s); 255 return (0); 256 } 257 ipq_locked = 1; 258 splx(s); 259 return (1); 260} 261 262static __inline void 263ipq_unlock() 264{ 265 int s; 266 267 s = splvm(); 268 ipq_locked = 0; 269 splx(s); 270} 271 272#ifdef DIAGNOSTIC 273#define IPQ_LOCK() \ 274do { \ 275 if (ipq_lock_try() == 0) { \ 276 printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \ 277 panic("ipq_lock"); \ 278 } \ 279} while (/*CONSTCOND*/ 0) 280#define IPQ_LOCK_CHECK() \ 281do { \ 282 if (ipq_locked == 0) { \ 283 printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \ 284 panic("ipq lock check"); \ 285 } \ 286} while (/*CONSTCOND*/ 0) 287#else 288#define IPQ_LOCK() (void) ipq_lock_try() 289#define IPQ_LOCK_CHECK() /* nothing */ 290#endif 291 292#define IPQ_UNLOCK() ipq_unlock() 293 294struct pool inmulti_pool; 295struct pool ipqent_pool; 296 297#ifdef INET_CSUM_COUNTERS 298#include <sys/device.h> 299 300struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 301 NULL, "inet", "hwcsum bad"); 302struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 303 NULL, "inet", "hwcsum ok"); 304struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 305 NULL, "inet", "swcsum"); 306 307#define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 308 309#else 310 311#define INET_CSUM_COUNTER_INCR(ev) /* nothing */ 312 313#endif /* INET_CSUM_COUNTERS */ 314 315/* 316 * We need to save the IP options in case a protocol wants to respond 317 * to an incoming packet over the same route if the packet got here 318 * using IP source routing. This allows connection establishment and 319 * maintenance when the remote end is on a network that is not known 320 * to us. 321 */ 322int ip_nhops = 0; 323static struct ip_srcrt { 324 struct in_addr dst; /* final destination */ 325 char nop; /* one NOP to align */ 326 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 327 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 328} ip_srcrt; 329 330static void save_rte __P((u_char *, struct in_addr)); 331 332#ifdef MBUFTRACE 333struct mowner ip_rx_mowner = { "internet", "rx" }; 334struct mowner ip_tx_mowner = { "internet", "tx" }; 335#endif 336 337/* 338 * IP initialization: fill in IP protocol switch table. 339 * All protocols not implemented in kernel go to raw IP protocol handler. 340 */ 341void 342ip_init() 343{ 344 struct protosw *pr; 345 int i; 346 347 pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", 348 NULL); 349 pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", 350 NULL); 351 352 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 353 if (pr == 0) 354 panic("ip_init"); 355 for (i = 0; i < IPPROTO_MAX; i++) 356 ip_protox[i] = pr - inetsw; 357 for (pr = inetdomain.dom_protosw; 358 pr < inetdomain.dom_protoswNPROTOSW; pr++) 359 if (pr->pr_domain->dom_family == PF_INET && 360 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 361 ip_protox[pr->pr_protocol] = pr - inetsw; 362 LIST_INIT(&ipq); 363 ip_id = time.tv_sec & 0xffff; 364 ipintrq.ifq_maxlen = ipqmaxlen; 365 TAILQ_INIT(&in_ifaddr); 366 in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR, 367 M_WAITOK, &in_ifaddrhash); 368 in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR, 369 M_WAITOK, &in_multihash); 370 ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); 371#ifdef GATEWAY 372 ipflow_init(); 373#endif 374 375#ifdef PFIL_HOOKS 376 /* Register our Packet Filter hook. */ 377 inet_pfil_hook.ph_type = PFIL_TYPE_AF; 378 inet_pfil_hook.ph_af = AF_INET; 379 i = pfil_head_register(&inet_pfil_hook); 380 if (i != 0) 381 printf("ip_init: WARNING: unable to register pfil hook, " 382 "error %d\n", i); 383#endif /* PFIL_HOOKS */ 384 385#ifdef INET_CSUM_COUNTERS 386 evcnt_attach_static(&ip_hwcsum_bad); 387 evcnt_attach_static(&ip_hwcsum_ok); 388 evcnt_attach_static(&ip_swcsum); 389#endif /* INET_CSUM_COUNTERS */ 390 391#ifdef MBUFTRACE 392 MOWNER_ATTACH(&ip_tx_mowner); 393 MOWNER_ATTACH(&ip_rx_mowner); 394#endif /* MBUFTRACE */ 395} 396 397struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; 398struct route ipforward_rt; 399 400/* 401 * IP software interrupt routine 402 */ 403void 404ipintr() 405{ 406 int s; 407 struct mbuf *m; 408 409 while (1) { 410 s = splnet(); 411 IF_DEQUEUE(&ipintrq, m); 412 splx(s); 413 if (m == 0) 414 return; 415 MCLAIM(m, &ip_rx_mowner); 416 ip_input(m); 417 } 418} 419 420/* 421 * Ip input routine. Checksum and byte swap header. If fragmented 422 * try to reassemble. Process options. Pass to next level. 423 */ 424void 425ip_input(struct mbuf *m) 426{ 427 struct ip *ip = NULL; 428 struct ipq *fp; 429 struct in_ifaddr *ia; 430 struct ifaddr *ifa; 431 struct ipqent *ipqe; 432 int hlen = 0, mff, len; 433 int downmatch; 434 int checkif; 435 436 MCLAIM(m, &ip_rx_mowner); 437#ifdef DIAGNOSTIC 438 if ((m->m_flags & M_PKTHDR) == 0) 439 panic("ipintr no HDR"); 440#endif 441#ifdef IPSEC 442 /* 443 * should the inner packet be considered authentic? 444 * see comment in ah4_input(). 445 */ 446 if (m) { 447 m->m_flags &= ~M_AUTHIPHDR; 448 m->m_flags &= ~M_AUTHIPDGM; 449 } 450#endif 451 452 /* 453 * If no IP addresses have been set yet but the interfaces 454 * are receiving, can't do anything with incoming packets yet. 455 */ 456 if (TAILQ_FIRST(&in_ifaddr) == 0) 457 goto bad; 458 ipstat.ips_total++; 459 /* 460 * If the IP header is not aligned, slurp it up into a new 461 * mbuf with space for link headers, in the event we forward 462 * it. Otherwise, if it is aligned, make sure the entire 463 * base IP header is in the first mbuf of the chain. 464 */ 465 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 466 if ((m = m_copyup(m, sizeof(struct ip), 467 (max_linkhdr + 3) & ~3)) == NULL) { 468 /* XXXJRT new stat, please */ 469 ipstat.ips_toosmall++; 470 return; 471 } 472 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 473 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 474 ipstat.ips_toosmall++; 475 return; 476 } 477 } 478 ip = mtod(m, struct ip *); 479 if (ip->ip_v != IPVERSION) { 480 ipstat.ips_badvers++; 481 goto bad; 482 } 483 hlen = ip->ip_hl << 2; 484 if (hlen < sizeof(struct ip)) { /* minimum header length */ 485 ipstat.ips_badhlen++; 486 goto bad; 487 } 488 if (hlen > m->m_len) { 489 if ((m = m_pullup(m, hlen)) == 0) { 490 ipstat.ips_badhlen++; 491 return; 492 } 493 ip = mtod(m, struct ip *); 494 } 495 496 /* 497 * RFC1122: packets with a multicast source address are 498 * not allowed. 499 */ 500 if (IN_MULTICAST(ip->ip_src.s_addr)) { 501 ipstat.ips_badaddr++; 502 goto bad; 503 } 504 505 /* 127/8 must not appear on wire - RFC1122 */ 506 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 507 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 508 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 509 ipstat.ips_badaddr++; 510 goto bad; 511 } 512 } 513 514 switch (m->m_pkthdr.csum_flags & 515 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 516 M_CSUM_IPv4_BAD)) { 517 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 518 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 519 goto badcsum; 520 521 case M_CSUM_IPv4: 522 /* Checksum was okay. */ 523 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 524 break; 525 526 default: 527 /* Must compute it ourselves. */ 528 INET_CSUM_COUNTER_INCR(&ip_swcsum); 529 if (in_cksum(m, hlen) != 0) 530 goto bad; 531 break; 532 } 533 534 /* Retrieve the packet length. */ 535 len = ntohs(ip->ip_len); 536 537 /* 538 * Check for additional length bogosity 539 */ 540 if (len < hlen) { 541 ipstat.ips_badlen++; 542 goto bad; 543 } 544 545 /* 546 * Check that the amount of data in the buffers 547 * is as at least much as the IP header would have us expect. 548 * Trim mbufs if longer than we expect. 549 * Drop packet if shorter than we expect. 550 */ 551 if (m->m_pkthdr.len < len) { 552 ipstat.ips_tooshort++; 553 goto bad; 554 } 555 if (m->m_pkthdr.len > len) { 556 if (m->m_len == m->m_pkthdr.len) { 557 m->m_len = len; 558 m->m_pkthdr.len = len; 559 } else 560 m_adj(m, len - m->m_pkthdr.len); 561 } 562 563#ifdef IPSEC 564 /* ipflow (IP fast forwarding) is not compatible with IPsec. */ 565 m->m_flags &= ~M_CANFASTFWD; 566#else 567 /* 568 * Assume that we can create a fast-forward IP flow entry 569 * based on this packet. 570 */ 571 m->m_flags |= M_CANFASTFWD; 572#endif 573 574#ifdef PFIL_HOOKS 575 /* 576 * Run through list of hooks for input packets. If there are any 577 * filters which require that additional packets in the flow are 578 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 579 * Note that filters must _never_ set this flag, as another filter 580 * in the list may have previously cleared it. 581 */ 582 /* 583 * let ipfilter look at packet on the wire, 584 * not the decapsulated packet. 585 */ 586#ifdef IPSEC 587 if (!ipsec_getnhist(m)) 588#else 589 if (1) 590#endif 591 { 592 if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif, 593 PFIL_IN) != 0) 594 return; 595 if (m == NULL) 596 return; 597 ip = mtod(m, struct ip *); 598 hlen = ip->ip_hl << 2; 599 } 600#endif /* PFIL_HOOKS */ 601 602#ifdef ALTQ 603 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 604 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) { 605 /* packet dropped by traffic conditioner */ 606 return; 607 } 608#endif 609 610 /* 611 * Process options and, if not destined for us, 612 * ship it on. ip_dooptions returns 1 when an 613 * error was detected (causing an icmp message 614 * to be sent and the original packet to be freed). 615 */ 616 ip_nhops = 0; /* for source routed packets */ 617 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 618 return; 619 620 /* 621 * Enable a consistency check between the destination address 622 * and the arrival interface for a unicast packet (the RFC 1122 623 * strong ES model) if IP forwarding is disabled and the packet 624 * is not locally generated. 625 * 626 * XXX - Checking also should be disabled if the destination 627 * address is ipnat'ed to a different interface. 628 * 629 * XXX - Checking is incompatible with IP aliases added 630 * to the loopback interface instead of the interface where 631 * the packets are received. 632 * 633 * XXX - We need to add a per ifaddr flag for this so that 634 * we get finer grain control. 635 */ 636 checkif = ip_checkinterface && (ipforwarding == 0) && 637 (m->m_pkthdr.rcvif != NULL) && 638 ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0); 639 640 /* 641 * Check our list of addresses, to see if the packet is for us. 642 * 643 * Traditional 4.4BSD did not consult IFF_UP at all. 644 * The behavior here is to treat addresses on !IFF_UP interface 645 * as not mine. 646 */ 647 downmatch = 0; 648 LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 649 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 650 if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif) 651 continue; 652 if ((ia->ia_ifp->if_flags & IFF_UP) != 0) 653 break; 654 else 655 downmatch++; 656 } 657 } 658 if (ia != NULL) 659 goto ours; 660 if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { 661 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) { 662 if (ifa->ifa_addr->sa_family != AF_INET) 663 continue; 664 ia = ifatoia(ifa); 665 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 666 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 667 /* 668 * Look for all-0's host part (old broadcast addr), 669 * either for subnet or net. 670 */ 671 ip->ip_dst.s_addr == ia->ia_subnet || 672 ip->ip_dst.s_addr == ia->ia_net) 673 goto ours; 674 /* 675 * An interface with IP address zero accepts 676 * all packets that arrive on that interface. 677 */ 678 if (in_nullhost(ia->ia_addr.sin_addr)) 679 goto ours; 680 } 681 } 682 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 683 struct in_multi *inm; 684#ifdef MROUTING 685 extern struct socket *ip_mrouter; 686 687 if (M_READONLY(m)) { 688 if ((m = m_pullup(m, hlen)) == 0) { 689 ipstat.ips_toosmall++; 690 return; 691 } 692 ip = mtod(m, struct ip *); 693 } 694 695 if (ip_mrouter) { 696 /* 697 * If we are acting as a multicast router, all 698 * incoming multicast packets are passed to the 699 * kernel-level multicast forwarding function. 700 * The packet is returned (relatively) intact; if 701 * ip_mforward() returns a non-zero value, the packet 702 * must be discarded, else it may be accepted below. 703 * 704 * (The IP ident field is put in the same byte order 705 * as expected when ip_mforward() is called from 706 * ip_output().) 707 */ 708 if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { 709 ipstat.ips_cantforward++; 710 m_freem(m); 711 return; 712 } 713 714 /* 715 * The process-level routing demon needs to receive 716 * all multicast IGMP packets, whether or not this 717 * host belongs to their destination groups. 718 */ 719 if (ip->ip_p == IPPROTO_IGMP) 720 goto ours; 721 ipstat.ips_forward++; 722 } 723#endif 724 /* 725 * See if we belong to the destination multicast group on the 726 * arrival interface. 727 */ 728 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 729 if (inm == NULL) { 730 ipstat.ips_cantforward++; 731 m_freem(m); 732 return; 733 } 734 goto ours; 735 } 736 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 737 in_nullhost(ip->ip_dst)) 738 goto ours; 739 740 /* 741 * Not for us; forward if possible and desirable. 742 */ 743 if (ipforwarding == 0) { 744 ipstat.ips_cantforward++; 745 m_freem(m); 746 } else { 747 /* 748 * If ip_dst matched any of my address on !IFF_UP interface, 749 * and there's no IFF_UP interface that matches ip_dst, 750 * send icmp unreach. Forwarding it will result in in-kernel 751 * forwarding loop till TTL goes to 0. 752 */ 753 if (downmatch) { 754 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 755 ipstat.ips_cantforward++; 756 return; 757 } 758#ifdef IPSEC 759 if (ipsec4_in_reject(m, NULL)) { 760 ipsecstat.in_polvio++; 761 goto bad; 762 } 763#endif 764 765 ip_forward(m, 0); 766 } 767 return; 768 769ours: 770 /* 771 * If offset or IP_MF are set, must reassemble. 772 * Otherwise, nothing need be done. 773 * (We could look in the reassembly queue to see 774 * if the packet was previously fragmented, 775 * but it's not worth the time; just let them time out.) 776 */ 777 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 778 if (M_READONLY(m)) { 779 if ((m = m_pullup(m, hlen)) == NULL) { 780 ipstat.ips_toosmall++; 781 goto bad; 782 } 783 ip = mtod(m, struct ip *); 784 } 785 786 /* 787 * Look for queue of fragments 788 * of this datagram. 789 */ 790 IPQ_LOCK(); 791 LIST_FOREACH(fp, &ipq, ipq_q) 792 if (ip->ip_id == fp->ipq_id && 793 in_hosteq(ip->ip_src, fp->ipq_src) && 794 in_hosteq(ip->ip_dst, fp->ipq_dst) && 795 ip->ip_p == fp->ipq_p) 796 goto found; 797 fp = 0; 798found: 799 800 /* 801 * Adjust ip_len to not reflect header, 802 * set ipqe_mff if more fragments are expected, 803 * convert offset of this to bytes. 804 */ 805 ip->ip_len = htons(ntohs(ip->ip_len) - hlen); 806 mff = (ip->ip_off & htons(IP_MF)) != 0; 807 if (mff) { 808 /* 809 * Make sure that fragments have a data length 810 * that's a non-zero multiple of 8 bytes. 811 */ 812 if (ntohs(ip->ip_len) == 0 || 813 (ntohs(ip->ip_len) & 0x7) != 0) { 814 ipstat.ips_badfrags++; 815 IPQ_UNLOCK(); 816 goto bad; 817 } 818 } 819 ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3); 820 821 /* 822 * If datagram marked as having more fragments 823 * or if this is not the first fragment, 824 * attempt reassembly; if it succeeds, proceed. 825 */ 826 if (mff || ip->ip_off != htons(0)) { 827 ipstat.ips_fragments++; 828 ipqe = pool_get(&ipqent_pool, PR_NOWAIT); 829 if (ipqe == NULL) { 830 ipstat.ips_rcvmemdrop++; 831 IPQ_UNLOCK(); 832 goto bad; 833 } 834 ipqe->ipqe_mff = mff; 835 ipqe->ipqe_m = m; 836 ipqe->ipqe_ip = ip; 837 m = ip_reass(ipqe, fp); 838 if (m == 0) { 839 IPQ_UNLOCK(); 840 return; 841 } 842 ipstat.ips_reassembled++; 843 ip = mtod(m, struct ip *); 844 hlen = ip->ip_hl << 2; 845 ip->ip_len = htons(ntohs(ip->ip_len) + hlen); 846 } else 847 if (fp) 848 ip_freef(fp); 849 IPQ_UNLOCK(); 850 } 851 852#ifdef IPSEC 853 /* 854 * enforce IPsec policy checking if we are seeing last header. 855 * note that we do not visit this with protocols with pcb layer 856 * code - like udp/tcp/raw ip. 857 */ 858 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 && 859 ipsec4_in_reject(m, NULL)) { 860 ipsecstat.in_polvio++; 861 goto bad; 862 } 863#endif 864 865 /* 866 * Switch out to protocol's input routine. 867 */ 868#if IFA_STATS 869 if (ia && ip) 870 ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 871#endif 872 ipstat.ips_delivered++; 873 { 874 int off = hlen, nh = ip->ip_p; 875 876 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 877 return; 878 } 879bad: 880 m_freem(m); 881 return; 882 883badcsum: 884 ipstat.ips_badsum++; 885 m_freem(m); 886} 887 888/* 889 * Take incoming datagram fragment and try to 890 * reassemble it into whole datagram. If a chain for 891 * reassembly of this datagram already exists, then it 892 * is given as fp; otherwise have to make a chain. 893 */ 894struct mbuf * 895ip_reass(ipqe, fp) 896 struct ipqent *ipqe; 897 struct ipq *fp; 898{ 899 struct mbuf *m = ipqe->ipqe_m; 900 struct ipqent *nq, *p, *q; 901 struct ip *ip; 902 struct mbuf *t; 903 int hlen = ipqe->ipqe_ip->ip_hl << 2; 904 int i, next; 905 906 IPQ_LOCK_CHECK(); 907 908 /* 909 * Presence of header sizes in mbufs 910 * would confuse code below. 911 */ 912 m->m_data += hlen; 913 m->m_len -= hlen; 914 915 /* 916 * If first fragment to arrive, create a reassembly queue. 917 */ 918 if (fp == 0) { 919 /* 920 * Enforce upper bound on number of fragmented packets 921 * for which we attempt reassembly; 922 * If maxfrag is 0, never accept fragments. 923 * If maxfrag is -1, accept all fragments without limitation. 924 */ 925 if (ip_maxfragpackets < 0) 926 ; 927 else if (ip_nfragpackets >= ip_maxfragpackets) 928 goto dropfrag; 929 ip_nfragpackets++; 930 MALLOC(fp, struct ipq *, sizeof (struct ipq), 931 M_FTABLE, M_NOWAIT); 932 if (fp == NULL) 933 goto dropfrag; 934 LIST_INSERT_HEAD(&ipq, fp, ipq_q); 935 fp->ipq_ttl = IPFRAGTTL; 936 fp->ipq_p = ipqe->ipqe_ip->ip_p; 937 fp->ipq_id = ipqe->ipqe_ip->ip_id; 938 TAILQ_INIT(&fp->ipq_fragq); 939 fp->ipq_src = ipqe->ipqe_ip->ip_src; 940 fp->ipq_dst = ipqe->ipqe_ip->ip_dst; 941 p = NULL; 942 goto insert; 943 } 944 945 /* 946 * Find a segment which begins after this one does. 947 */ 948 for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; 949 p = q, q = TAILQ_NEXT(q, ipqe_q)) 950 if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off)) 951 break; 952 953 /* 954 * If there is a preceding segment, it may provide some of 955 * our data already. If so, drop the data from the incoming 956 * segment. If it provides all of our data, drop us. 957 */ 958 if (p != NULL) { 959 i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) - 960 ntohs(ipqe->ipqe_ip->ip_off); 961 if (i > 0) { 962 if (i >= ntohs(ipqe->ipqe_ip->ip_len)) 963 goto dropfrag; 964 m_adj(ipqe->ipqe_m, i); 965 ipqe->ipqe_ip->ip_off = 966 htons(ntohs(ipqe->ipqe_ip->ip_off) + i); 967 ipqe->ipqe_ip->ip_len = 968 htons(ntohs(ipqe->ipqe_ip->ip_len) - i); 969 } 970 } 971 972 /* 973 * While we overlap succeeding segments trim them or, 974 * if they are completely covered, dequeue them. 975 */ 976 for (; q != NULL && 977 ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) > 978 ntohs(q->ipqe_ip->ip_off); q = nq) { 979 i = (ntohs(ipqe->ipqe_ip->ip_off) + 980 ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off); 981 if (i < ntohs(q->ipqe_ip->ip_len)) { 982 q->ipqe_ip->ip_len = 983 htons(ntohs(q->ipqe_ip->ip_len) - i); 984 q->ipqe_ip->ip_off = 985 htons(ntohs(q->ipqe_ip->ip_off) + i); 986 m_adj(q->ipqe_m, i); 987 break; 988 } 989 nq = TAILQ_NEXT(q, ipqe_q); 990 m_freem(q->ipqe_m); 991 TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q); 992 pool_put(&ipqent_pool, q); 993 } 994 995insert: 996 /* 997 * Stick new segment in its place; 998 * check for complete reassembly. 999 */ 1000 if (p == NULL) { 1001 TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q); 1002 } else { 1003 TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q); 1004 } 1005 next = 0; 1006 for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; 1007 p = q, q = TAILQ_NEXT(q, ipqe_q)) { 1008 if (ntohs(q->ipqe_ip->ip_off) != next) 1009 return (0); 1010 next += ntohs(q->ipqe_ip->ip_len); 1011 } 1012 if (p->ipqe_mff) 1013 return (0); 1014 1015 /* 1016 * Reassembly is complete. Check for a bogus message size and 1017 * concatenate fragments. 1018 */ 1019 q = TAILQ_FIRST(&fp->ipq_fragq); 1020 ip = q->ipqe_ip; 1021 if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) { 1022 ipstat.ips_toolong++; 1023 ip_freef(fp); 1024 return (0); 1025 } 1026 m = q->ipqe_m; 1027 t = m->m_next; 1028 m->m_next = 0; 1029 m_cat(m, t); 1030 nq = TAILQ_NEXT(q, ipqe_q); 1031 pool_put(&ipqent_pool, q); 1032 for (q = nq; q != NULL; q = nq) { 1033 t = q->ipqe_m; 1034 nq = TAILQ_NEXT(q, ipqe_q); 1035 pool_put(&ipqent_pool, q); 1036 m_cat(m, t); 1037 } 1038 1039 /* 1040 * Create header for new ip packet by 1041 * modifying header of first packet; 1042 * dequeue and discard fragment reassembly header. 1043 * Make header visible. 1044 */ 1045 ip->ip_len = htons(next); 1046 ip->ip_src = fp->ipq_src; 1047 ip->ip_dst = fp->ipq_dst; 1048 LIST_REMOVE(fp, ipq_q); 1049 FREE(fp, M_FTABLE); 1050 ip_nfragpackets--; 1051 m->m_len += (ip->ip_hl << 2); 1052 m->m_data -= (ip->ip_hl << 2); 1053 /* some debugging cruft by sklower, below, will go away soon */ 1054 if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */ 1055 int plen = 0; 1056 for (t = m; t; t = t->m_next) 1057 plen += t->m_len; 1058 m->m_pkthdr.len = plen; 1059 } 1060 return (m); 1061 1062dropfrag: 1063 ipstat.ips_fragdropped++; 1064 m_freem(m); 1065 pool_put(&ipqent_pool, ipqe); 1066 return (0); 1067} 1068 1069/* 1070 * Free a fragment reassembly header and all 1071 * associated datagrams. 1072 */ 1073void 1074ip_freef(fp) 1075 struct ipq *fp; 1076{ 1077 struct ipqent *q, *p; 1078 1079 IPQ_LOCK_CHECK(); 1080 1081 for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) { 1082 p = TAILQ_NEXT(q, ipqe_q); 1083 m_freem(q->ipqe_m); 1084 TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q); 1085 pool_put(&ipqent_pool, q); 1086 } 1087 LIST_REMOVE(fp, ipq_q); 1088 FREE(fp, M_FTABLE); 1089 ip_nfragpackets--; 1090} 1091 1092/* 1093 * IP timer processing; 1094 * if a timer expires on a reassembly 1095 * queue, discard it. 1096 */ 1097void 1098ip_slowtimo() 1099{ 1100 struct ipq *fp, *nfp; 1101 int s = splsoftnet(); 1102 1103 IPQ_LOCK(); 1104 for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) { 1105 nfp = LIST_NEXT(fp, ipq_q); 1106 if (--fp->ipq_ttl == 0) { 1107 ipstat.ips_fragtimeout++; 1108 ip_freef(fp); 1109 } 1110 } 1111 /* 1112 * If we are over the maximum number of fragments 1113 * (due to the limit being lowered), drain off 1114 * enough to get down to the new limit. 1115 */ 1116 if (ip_maxfragpackets < 0) 1117 ; 1118 else { 1119 while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq)) 1120 ip_freef(LIST_FIRST(&ipq)); 1121 } 1122 IPQ_UNLOCK(); 1123#ifdef GATEWAY 1124 ipflow_slowtimo(); 1125#endif 1126 splx(s); 1127} 1128 1129/* 1130 * Drain off all datagram fragments. 1131 */ 1132void 1133ip_drain() 1134{ 1135 1136 /* 1137 * We may be called from a device's interrupt context. If 1138 * the ipq is already busy, just bail out now. 1139 */ 1140 if (ipq_lock_try() == 0) 1141 return; 1142 1143 while (LIST_FIRST(&ipq) != NULL) { 1144 ipstat.ips_fragdropped++; 1145 ip_freef(LIST_FIRST(&ipq)); 1146 } 1147 1148 IPQ_UNLOCK(); 1149} 1150 1151/* 1152 * Do option processing on a datagram, 1153 * possibly discarding it if bad options are encountered, 1154 * or forwarding it if source-routed. 1155 * Returns 1 if packet has been forwarded/freed, 1156 * 0 if the packet should be processed further. 1157 */ 1158int 1159ip_dooptions(m) 1160 struct mbuf *m; 1161{ 1162 struct ip *ip = mtod(m, struct ip *); 1163 u_char *cp, *cp0; 1164 struct ip_timestamp *ipt; 1165 struct in_ifaddr *ia; 1166 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 1167 struct in_addr dst; 1168 n_time ntime; 1169 1170 dst = ip->ip_dst; 1171 cp = (u_char *)(ip + 1); 1172 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 1173 for (; cnt > 0; cnt -= optlen, cp += optlen) { 1174 opt = cp[IPOPT_OPTVAL]; 1175 if (opt == IPOPT_EOL) 1176 break; 1177 if (opt == IPOPT_NOP) 1178 optlen = 1; 1179 else { 1180 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 1181 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1182 goto bad; 1183 } 1184 optlen = cp[IPOPT_OLEN]; 1185 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 1186 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1187 goto bad; 1188 } 1189 } 1190 switch (opt) { 1191 1192 default: 1193 break; 1194 1195 /* 1196 * Source routing with record. 1197 * Find interface with current destination address. 1198 * If none on this machine then drop if strictly routed, 1199 * or do nothing if loosely routed. 1200 * Record interface address and bring up next address 1201 * component. If strictly routed make sure next 1202 * address is on directly accessible net. 1203 */ 1204 case IPOPT_LSRR: 1205 case IPOPT_SSRR: 1206 if (ip_allowsrcrt == 0) { 1207 type = ICMP_UNREACH; 1208 code = ICMP_UNREACH_NET_PROHIB; 1209 goto bad; 1210 } 1211 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1212 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1213 goto bad; 1214 } 1215 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1216 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1217 goto bad; 1218 } 1219 ipaddr.sin_addr = ip->ip_dst; 1220 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 1221 if (ia == 0) { 1222 if (opt == IPOPT_SSRR) { 1223 type = ICMP_UNREACH; 1224 code = ICMP_UNREACH_SRCFAIL; 1225 goto bad; 1226 } 1227 /* 1228 * Loose routing, and not at next destination 1229 * yet; nothing to do except forward. 1230 */ 1231 break; 1232 } 1233 off--; /* 0 origin */ 1234 if ((off + sizeof(struct in_addr)) > optlen) { 1235 /* 1236 * End of source route. Should be for us. 1237 */ 1238 save_rte(cp, ip->ip_src); 1239 break; 1240 } 1241 /* 1242 * locate outgoing interface 1243 */ 1244 bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr, 1245 sizeof(ipaddr.sin_addr)); 1246 if (opt == IPOPT_SSRR) 1247 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 1248 else 1249 ia = ip_rtaddr(ipaddr.sin_addr); 1250 if (ia == 0) { 1251 type = ICMP_UNREACH; 1252 code = ICMP_UNREACH_SRCFAIL; 1253 goto bad; 1254 } 1255 ip->ip_dst = ipaddr.sin_addr; 1256 bcopy((caddr_t)&ia->ia_addr.sin_addr, 1257 (caddr_t)(cp + off), sizeof(struct in_addr)); 1258 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1259 /* 1260 * Let ip_intr's mcast routing check handle mcast pkts 1261 */ 1262 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 1263 break; 1264 1265 case IPOPT_RR: 1266 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1267 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1268 goto bad; 1269 } 1270 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1271 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1272 goto bad; 1273 } 1274 /* 1275 * If no space remains, ignore. 1276 */ 1277 off--; /* 0 origin */ 1278 if ((off + sizeof(struct in_addr)) > optlen) 1279 break; 1280 bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr, 1281 sizeof(ipaddr.sin_addr)); 1282 /* 1283 * locate outgoing interface; if we're the destination, 1284 * use the incoming interface (should be same). 1285 */ 1286 if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))) 1287 == NULL && 1288 (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) { 1289 type = ICMP_UNREACH; 1290 code = ICMP_UNREACH_HOST; 1291 goto bad; 1292 } 1293 bcopy((caddr_t)&ia->ia_addr.sin_addr, 1294 (caddr_t)(cp + off), sizeof(struct in_addr)); 1295 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1296 break; 1297 1298 case IPOPT_TS: 1299 code = cp - (u_char *)ip; 1300 ipt = (struct ip_timestamp *)cp; 1301 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1302 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1303 goto bad; 1304 } 1305 if (ipt->ipt_ptr < 5) { 1306 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1307 goto bad; 1308 } 1309 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 1310 if (++ipt->ipt_oflw == 0) { 1311 code = (u_char *)&ipt->ipt_ptr - 1312 (u_char *)ip; 1313 goto bad; 1314 } 1315 break; 1316 } 1317 cp0 = (cp + ipt->ipt_ptr - 1); 1318 switch (ipt->ipt_flg) { 1319 1320 case IPOPT_TS_TSONLY: 1321 break; 1322 1323 case IPOPT_TS_TSANDADDR: 1324 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1325 sizeof(struct in_addr) > ipt->ipt_len) { 1326 code = (u_char *)&ipt->ipt_ptr - 1327 (u_char *)ip; 1328 goto bad; 1329 } 1330 ipaddr.sin_addr = dst; 1331 ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr), 1332 m->m_pkthdr.rcvif)); 1333 if (ia == 0) 1334 continue; 1335 bcopy(&ia->ia_addr.sin_addr, 1336 cp0, sizeof(struct in_addr)); 1337 ipt->ipt_ptr += sizeof(struct in_addr); 1338 break; 1339 1340 case IPOPT_TS_PRESPEC: 1341 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1342 sizeof(struct in_addr) > ipt->ipt_len) { 1343 code = (u_char *)&ipt->ipt_ptr - 1344 (u_char *)ip; 1345 goto bad; 1346 } 1347 bcopy(cp0, &ipaddr.sin_addr, 1348 sizeof(struct in_addr)); 1349 if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))) 1350 == NULL) 1351 continue; 1352 ipt->ipt_ptr += sizeof(struct in_addr); 1353 break; 1354 1355 default: 1356 /* XXX can't take &ipt->ipt_flg */ 1357 code = (u_char *)&ipt->ipt_ptr - 1358 (u_char *)ip + 1; 1359 goto bad; 1360 } 1361 ntime = iptime(); 1362 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1363 bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1, 1364 sizeof(n_time)); 1365 ipt->ipt_ptr += sizeof(n_time); 1366 } 1367 } 1368 if (forward) { 1369 if (ip_forwsrcrt == 0) { 1370 type = ICMP_UNREACH; 1371 code = ICMP_UNREACH_SRCFAIL; 1372 goto bad; 1373 } 1374 ip_forward(m, 1); 1375 return (1); 1376 } 1377 return (0); 1378bad: 1379 icmp_error(m, type, code, 0, 0); 1380 ipstat.ips_badoptions++; 1381 return (1); 1382} 1383 1384/* 1385 * Given address of next destination (final or next hop), 1386 * return internet address info of interface to be used to get there. 1387 */ 1388struct in_ifaddr * 1389ip_rtaddr(dst) 1390 struct in_addr dst; 1391{ 1392 struct sockaddr_in *sin; 1393 1394 sin = satosin(&ipforward_rt.ro_dst); 1395 1396 if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) { 1397 if (ipforward_rt.ro_rt) { 1398 RTFREE(ipforward_rt.ro_rt); 1399 ipforward_rt.ro_rt = 0; 1400 } 1401 sin->sin_family = AF_INET; 1402 sin->sin_len = sizeof(*sin); 1403 sin->sin_addr = dst; 1404 1405 rtalloc(&ipforward_rt); 1406 } 1407 if (ipforward_rt.ro_rt == 0) 1408 return ((struct in_ifaddr *)0); 1409 return (ifatoia(ipforward_rt.ro_rt->rt_ifa)); 1410} 1411 1412/* 1413 * Save incoming source route for use in replies, 1414 * to be picked up later by ip_srcroute if the receiver is interested. 1415 */ 1416void 1417save_rte(option, dst) 1418 u_char *option; 1419 struct in_addr dst; 1420{ 1421 unsigned olen; 1422 1423 olen = option[IPOPT_OLEN]; 1424#ifdef DIAGNOSTIC 1425 if (ipprintfs) 1426 printf("save_rte: olen %d\n", olen); 1427#endif /* 0 */ 1428 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1429 return; 1430 bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen); 1431 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1432 ip_srcrt.dst = dst; 1433} 1434 1435/* 1436 * Retrieve incoming source route for use in replies, 1437 * in the same form used by setsockopt. 1438 * The first hop is placed before the options, will be removed later. 1439 */ 1440struct mbuf * 1441ip_srcroute() 1442{ 1443 struct in_addr *p, *q; 1444 struct mbuf *m; 1445 1446 if (ip_nhops == 0) 1447 return ((struct mbuf *)0); 1448 m = m_get(M_DONTWAIT, MT_SOOPTS); 1449 if (m == 0) 1450 return ((struct mbuf *)0); 1451 1452 MCLAIM(m, &inetdomain.dom_mowner); 1453#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1454 1455 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1456 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1457 OPTSIZ; 1458#ifdef DIAGNOSTIC 1459 if (ipprintfs) 1460 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1461#endif 1462 1463 /* 1464 * First save first hop for return route 1465 */ 1466 p = &ip_srcrt.route[ip_nhops - 1]; 1467 *(mtod(m, struct in_addr *)) = *p--; 1468#ifdef DIAGNOSTIC 1469 if (ipprintfs) 1470 printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr)); 1471#endif 1472 1473 /* 1474 * Copy option fields and padding (nop) to mbuf. 1475 */ 1476 ip_srcrt.nop = IPOPT_NOP; 1477 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1478 bcopy((caddr_t)&ip_srcrt.nop, 1479 mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ); 1480 q = (struct in_addr *)(mtod(m, caddr_t) + 1481 sizeof(struct in_addr) + OPTSIZ); 1482#undef OPTSIZ 1483 /* 1484 * Record return path as an IP source route, 1485 * reversing the path (pointers are now aligned). 1486 */ 1487 while (p >= ip_srcrt.route) { 1488#ifdef DIAGNOSTIC 1489 if (ipprintfs) 1490 printf(" %x", ntohl(q->s_addr)); 1491#endif 1492 *q++ = *p--; 1493 } 1494 /* 1495 * Last hop goes to final destination. 1496 */ 1497 *q = ip_srcrt.dst; 1498#ifdef DIAGNOSTIC 1499 if (ipprintfs) 1500 printf(" %x\n", ntohl(q->s_addr)); 1501#endif 1502 return (m); 1503} 1504 1505/* 1506 * Strip out IP options, at higher 1507 * level protocol in the kernel. 1508 * Second argument is buffer to which options 1509 * will be moved, and return value is their length. 1510 * XXX should be deleted; last arg currently ignored. 1511 */ 1512void 1513ip_stripoptions(m, mopt) 1514 struct mbuf *m; 1515 struct mbuf *mopt; 1516{ 1517 int i; 1518 struct ip *ip = mtod(m, struct ip *); 1519 caddr_t opts; 1520 int olen; 1521 1522 olen = (ip->ip_hl << 2) - sizeof (struct ip); 1523 opts = (caddr_t)(ip + 1); 1524 i = m->m_len - (sizeof (struct ip) + olen); 1525 bcopy(opts + olen, opts, (unsigned)i); 1526 m->m_len -= olen; 1527 if (m->m_flags & M_PKTHDR) 1528 m->m_pkthdr.len -= olen; 1529 ip->ip_len = htons(ntohs(ip->ip_len) - olen); 1530 ip->ip_hl = sizeof (struct ip) >> 2; 1531} 1532 1533const int inetctlerrmap[PRC_NCMDS] = { 1534 0, 0, 0, 0, 1535 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1536 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1537 EMSGSIZE, EHOSTUNREACH, 0, 0, 1538 0, 0, 0, 0, 1539 ENOPROTOOPT 1540}; 1541 1542/* 1543 * Forward a packet. If some error occurs return the sender 1544 * an icmp packet. Note we can't always generate a meaningful 1545 * icmp message because icmp doesn't have a large enough repertoire 1546 * of codes and types. 1547 * 1548 * If not forwarding, just drop the packet. This could be confusing 1549 * if ipforwarding was zero but some routing protocol was advancing 1550 * us as a gateway to somewhere. However, we must let the routing 1551 * protocol deal with that. 1552 * 1553 * The srcrt parameter indicates whether the packet is being forwarded 1554 * via a source route. 1555 */ 1556void 1557ip_forward(m, srcrt) 1558 struct mbuf *m; 1559 int srcrt; 1560{ 1561 struct ip *ip = mtod(m, struct ip *); 1562 struct sockaddr_in *sin; 1563 struct rtentry *rt; 1564 int error, type = 0, code = 0; 1565 struct mbuf *mcopy; 1566 n_long dest; 1567 struct ifnet *destifp; 1568#ifdef IPSEC 1569 struct ifnet dummyifp; 1570#endif 1571 1572 /* 1573 * We are now in the output path. 1574 */ 1575 MCLAIM(m, &ip_tx_mowner); 1576 1577 /* 1578 * Clear any in-bound checksum flags for this packet. 1579 */ 1580 m->m_pkthdr.csum_flags = 0; 1581 1582 dest = 0; 1583#ifdef DIAGNOSTIC 1584 if (ipprintfs) 1585 printf("forward: src %2.2x dst %2.2x ttl %x\n", 1586 ntohl(ip->ip_src.s_addr), 1587 ntohl(ip->ip_dst.s_addr), ip->ip_ttl); 1588#endif 1589 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1590 ipstat.ips_cantforward++; 1591 m_freem(m); 1592 return; 1593 } 1594 if (ip->ip_ttl <= IPTTLDEC) { 1595 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1596 return; 1597 } 1598 ip->ip_ttl -= IPTTLDEC; 1599 1600 sin = satosin(&ipforward_rt.ro_dst); 1601 if ((rt = ipforward_rt.ro_rt) == 0 || 1602 !in_hosteq(ip->ip_dst, sin->sin_addr)) { 1603 if (ipforward_rt.ro_rt) { 1604 RTFREE(ipforward_rt.ro_rt); 1605 ipforward_rt.ro_rt = 0; 1606 } 1607 sin->sin_family = AF_INET; 1608 sin->sin_len = sizeof(struct sockaddr_in); 1609 sin->sin_addr = ip->ip_dst; 1610 1611 rtalloc(&ipforward_rt); 1612 if (ipforward_rt.ro_rt == 0) { 1613 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0); 1614 return; 1615 } 1616 rt = ipforward_rt.ro_rt; 1617 } 1618 1619 /* 1620 * Save at most 68 bytes of the packet in case 1621 * we need to generate an ICMP message to the src. 1622 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1623 */ 1624 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1625 if (mcopy) 1626 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1627 1628 /* 1629 * If forwarding packet using same interface that it came in on, 1630 * perhaps should send a redirect to sender to shortcut a hop. 1631 * Only send redirect if source is sending directly to us, 1632 * and if packet was not source routed (or has any options). 1633 * Also, don't send redirect if forwarding using a default route 1634 * or a route modified by a redirect. 1635 */ 1636 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1637 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1638 !in_nullhost(satosin(rt_key(rt))->sin_addr) && 1639 ipsendredirects && !srcrt) { 1640 if (rt->rt_ifa && 1641 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1642 ifatoia(rt->rt_ifa)->ia_subnet) { 1643 if (rt->rt_flags & RTF_GATEWAY) 1644 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1645 else 1646 dest = ip->ip_dst.s_addr; 1647 /* 1648 * Router requirements says to only send host 1649 * redirects. 1650 */ 1651 type = ICMP_REDIRECT; 1652 code = ICMP_REDIRECT_HOST; 1653#ifdef DIAGNOSTIC 1654 if (ipprintfs) 1655 printf("redirect (%d) to %x\n", code, 1656 (u_int32_t)dest); 1657#endif 1658 } 1659 } 1660 1661#ifdef IPSEC 1662 /* Don't lookup socket in forwarding case */ 1663 (void)ipsec_setsocket(m, NULL); 1664#endif 1665 error = ip_output(m, (struct mbuf *)0, &ipforward_rt, 1666 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0); 1667 if (error) 1668 ipstat.ips_cantforward++; 1669 else { 1670 ipstat.ips_forward++; 1671 if (type) 1672 ipstat.ips_redirectsent++; 1673 else { 1674 if (mcopy) { 1675#ifdef GATEWAY 1676 if (mcopy->m_flags & M_CANFASTFWD) 1677 ipflow_create(&ipforward_rt, mcopy); 1678#endif 1679 m_freem(mcopy); 1680 } 1681 return; 1682 } 1683 } 1684 if (mcopy == NULL) 1685 return; 1686 destifp = NULL; 1687 1688 switch (error) { 1689 1690 case 0: /* forwarded, but need redirect */ 1691 /* type, code set above */ 1692 break; 1693 1694 case ENETUNREACH: /* shouldn't happen, checked above */ 1695 case EHOSTUNREACH: 1696 case ENETDOWN: 1697 case EHOSTDOWN: 1698 default: 1699 type = ICMP_UNREACH; 1700 code = ICMP_UNREACH_HOST; 1701 break; 1702 1703 case EMSGSIZE: 1704 type = ICMP_UNREACH; 1705 code = ICMP_UNREACH_NEEDFRAG; 1706#ifndef IPSEC 1707 if (ipforward_rt.ro_rt) 1708 destifp = ipforward_rt.ro_rt->rt_ifp; 1709#else 1710 /* 1711 * If the packet is routed over IPsec tunnel, tell the 1712 * originator the tunnel MTU. 1713 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 1714 * XXX quickhack!!! 1715 */ 1716 if (ipforward_rt.ro_rt) { 1717 struct secpolicy *sp; 1718 int ipsecerror; 1719 size_t ipsechdr; 1720 struct route *ro; 1721 1722 sp = ipsec4_getpolicybyaddr(mcopy, 1723 IPSEC_DIR_OUTBOUND, 1724 IP_FORWARDING, 1725 &ipsecerror); 1726 1727 if (sp == NULL) 1728 destifp = ipforward_rt.ro_rt->rt_ifp; 1729 else { 1730 /* count IPsec header size */ 1731 ipsechdr = ipsec4_hdrsiz(mcopy, 1732 IPSEC_DIR_OUTBOUND, 1733 NULL); 1734 1735 /* 1736 * find the correct route for outer IPv4 1737 * header, compute tunnel MTU. 1738 * 1739 * XXX BUG ALERT 1740 * The "dummyifp" code relies upon the fact 1741 * that icmp_error() touches only ifp->if_mtu. 1742 */ 1743 /*XXX*/ 1744 destifp = NULL; 1745 if (sp->req != NULL 1746 && sp->req->sav != NULL 1747 && sp->req->sav->sah != NULL) { 1748 ro = &sp->req->sav->sah->sa_route; 1749 if (ro->ro_rt && ro->ro_rt->rt_ifp) { 1750 dummyifp.if_mtu = 1751 ro->ro_rt->rt_rmx.rmx_mtu ? 1752 ro->ro_rt->rt_rmx.rmx_mtu : 1753 ro->ro_rt->rt_ifp->if_mtu; 1754 dummyifp.if_mtu -= ipsechdr; 1755 destifp = &dummyifp; 1756 } 1757 } 1758 1759 key_freesp(sp); 1760 } 1761 } 1762#endif /*IPSEC*/ 1763 ipstat.ips_cantfrag++; 1764 break; 1765 1766 case ENOBUFS: 1767#if 1 1768 /* 1769 * a router should not generate ICMP_SOURCEQUENCH as 1770 * required in RFC1812 Requirements for IP Version 4 Routers. 1771 * source quench could be a big problem under DoS attacks, 1772 * or if the underlying interface is rate-limited. 1773 */ 1774 if (mcopy) 1775 m_freem(mcopy); 1776 return; 1777#else 1778 type = ICMP_SOURCEQUENCH; 1779 code = 0; 1780 break; 1781#endif 1782 } 1783 icmp_error(mcopy, type, code, dest, destifp); 1784} 1785 1786void 1787ip_savecontrol(inp, mp, ip, m) 1788 struct inpcb *inp; 1789 struct mbuf **mp; 1790 struct ip *ip; 1791 struct mbuf *m; 1792{ 1793 1794 if (inp->inp_socket->so_options & SO_TIMESTAMP) { 1795 struct timeval tv; 1796 1797 microtime(&tv); 1798 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1799 SCM_TIMESTAMP, SOL_SOCKET); 1800 if (*mp) 1801 mp = &(*mp)->m_next; 1802 } 1803 if (inp->inp_flags & INP_RECVDSTADDR) { 1804 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst, 1805 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1806 if (*mp) 1807 mp = &(*mp)->m_next; 1808 } 1809#ifdef notyet 1810 /* 1811 * XXX 1812 * Moving these out of udp_input() made them even more broken 1813 * than they already were. 1814 * - fenner@parc.xerox.com 1815 */ 1816 /* options were tossed already */ 1817 if (inp->inp_flags & INP_RECVOPTS) { 1818 *mp = sbcreatecontrol((caddr_t) opts_deleted_above, 1819 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1820 if (*mp) 1821 mp = &(*mp)->m_next; 1822 } 1823 /* ip_srcroute doesn't do what we want here, need to fix */ 1824 if (inp->inp_flags & INP_RECVRETOPTS) { 1825 *mp = sbcreatecontrol((caddr_t) ip_srcroute(), 1826 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1827 if (*mp) 1828 mp = &(*mp)->m_next; 1829 } 1830#endif 1831 if (inp->inp_flags & INP_RECVIF) { 1832 struct sockaddr_dl sdl; 1833 1834 sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]); 1835 sdl.sdl_family = AF_LINK; 1836 sdl.sdl_index = m->m_pkthdr.rcvif ? 1837 m->m_pkthdr.rcvif->if_index : 0; 1838 sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0; 1839 *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len, 1840 IP_RECVIF, IPPROTO_IP); 1841 if (*mp) 1842 mp = &(*mp)->m_next; 1843 } 1844} 1845 1846int 1847ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 1848 int *name; 1849 u_int namelen; 1850 void *oldp; 1851 size_t *oldlenp; 1852 void *newp; 1853 size_t newlen; 1854{ 1855 extern int subnetsarelocal, hostzeroisbroadcast; 1856 1857 int error, old; 1858 1859 /* All sysctl names at this level are terminal. */ 1860 if (namelen != 1) 1861 return (ENOTDIR); 1862 1863 switch (name[0]) { 1864 case IPCTL_FORWARDING: 1865 return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding)); 1866 case IPCTL_SENDREDIRECTS: 1867 return (sysctl_int(oldp, oldlenp, newp, newlen, 1868 &ipsendredirects)); 1869 case IPCTL_DEFTTL: 1870 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl)); 1871#ifdef notyet 1872 case IPCTL_DEFMTU: 1873 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu)); 1874#endif 1875 case IPCTL_FORWSRCRT: 1876 /* Don't allow this to change in a secure environment. */ 1877 if (securelevel > 0) 1878 return (sysctl_rdint(oldp, oldlenp, newp, 1879 ip_forwsrcrt)); 1880 else 1881 return (sysctl_int(oldp, oldlenp, newp, newlen, 1882 &ip_forwsrcrt)); 1883 case IPCTL_DIRECTEDBCAST: 1884 return (sysctl_int(oldp, oldlenp, newp, newlen, 1885 &ip_directedbcast)); 1886 case IPCTL_ALLOWSRCRT: 1887 return (sysctl_int(oldp, oldlenp, newp, newlen, 1888 &ip_allowsrcrt)); 1889 case IPCTL_SUBNETSARELOCAL: 1890 return (sysctl_int(oldp, oldlenp, newp, newlen, 1891 &subnetsarelocal)); 1892 case IPCTL_MTUDISC: 1893 error = sysctl_int(oldp, oldlenp, newp, newlen, 1894 &ip_mtudisc); 1895 if (error == 0 && ip_mtudisc == 0) 1896 rt_timer_queue_remove_all(ip_mtudisc_timeout_q, TRUE); 1897 return error; 1898 case IPCTL_ANONPORTMIN: 1899 old = anonportmin; 1900 error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin); 1901 if (anonportmin >= anonportmax || anonportmin < 0 1902 || anonportmin > 65535 1903#ifndef IPNOPRIVPORTS 1904 || anonportmin < IPPORT_RESERVED 1905#endif 1906 ) { 1907 anonportmin = old; 1908 return (EINVAL); 1909 } 1910 return (error); 1911 case IPCTL_ANONPORTMAX: 1912 old = anonportmax; 1913 error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax); 1914 if (anonportmin >= anonportmax || anonportmax < 0 1915 || anonportmax > 65535 1916#ifndef IPNOPRIVPORTS 1917 || anonportmax < IPPORT_RESERVED 1918#endif 1919 ) { 1920 anonportmax = old; 1921 return (EINVAL); 1922 } 1923 return (error); 1924 case IPCTL_MTUDISCTIMEOUT: 1925 old = ip_mtudisc_timeout; 1926 error = sysctl_int(oldp, oldlenp, newp, newlen, 1927 &ip_mtudisc_timeout); 1928 if (ip_mtudisc_timeout < 0) { 1929 ip_mtudisc_timeout = old; 1930 return (EINVAL); 1931 } 1932 if (error == 0) 1933 rt_timer_queue_change(ip_mtudisc_timeout_q, 1934 ip_mtudisc_timeout); 1935 return (error); 1936#ifdef GATEWAY 1937 case IPCTL_MAXFLOWS: 1938 { 1939 int s; 1940 1941 error = sysctl_int(oldp, oldlenp, newp, newlen, 1942 &ip_maxflows); 1943 s = splsoftnet(); 1944 ipflow_reap(0); 1945 splx(s); 1946 return (error); 1947 } 1948#endif 1949 case IPCTL_HOSTZEROBROADCAST: 1950 return (sysctl_int(oldp, oldlenp, newp, newlen, 1951 &hostzeroisbroadcast)); 1952#if NGIF > 0 1953 case IPCTL_GIF_TTL: 1954 return (sysctl_int(oldp, oldlenp, newp, newlen, 1955 &ip_gif_ttl)); 1956#endif 1957 1958#if NGRE > 0 1959 case IPCTL_GRE_TTL: 1960 return (sysctl_int(oldp, oldlenp, newp, newlen, 1961 &ip_gre_ttl)); 1962#endif 1963 1964#ifndef IPNOPRIVPORTS 1965 case IPCTL_LOWPORTMIN: 1966 old = lowportmin; 1967 error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin); 1968 if (lowportmin >= lowportmax 1969 || lowportmin > IPPORT_RESERVEDMAX 1970 || lowportmin < IPPORT_RESERVEDMIN 1971 ) { 1972 lowportmin = old; 1973 return (EINVAL); 1974 } 1975 return (error); 1976 case IPCTL_LOWPORTMAX: 1977 old = lowportmax; 1978 error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax); 1979 if (lowportmin >= lowportmax 1980 || lowportmax > IPPORT_RESERVEDMAX 1981 || lowportmax < IPPORT_RESERVEDMIN 1982 ) { 1983 lowportmax = old; 1984 return (EINVAL); 1985 } 1986 return (error); 1987#endif 1988 1989 case IPCTL_MAXFRAGPACKETS: 1990 return (sysctl_int(oldp, oldlenp, newp, newlen, 1991 &ip_maxfragpackets)); 1992 1993 case IPCTL_CHECKINTERFACE: 1994 return (sysctl_int(oldp, oldlenp, newp, newlen, 1995 &ip_checkinterface)); 1996 default: 1997 return (EOPNOTSUPP); 1998 } 1999 /* NOTREACHED */ 2000} 2001