ip_input.c revision 1.171
1/* $NetBSD: ip_input.c,v 1.171 2003/07/14 16:39:43 itojun 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 1.171 2003/07/14 16:39:43 itojun 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_mbuftrace.h" 112#include "opt_inet_csum.h" 113 114#include <sys/param.h> 115#include <sys/systm.h> 116#include <sys/malloc.h> 117#include <sys/mbuf.h> 118#include <sys/domain.h> 119#include <sys/protosw.h> 120#include <sys/socket.h> 121#include <sys/socketvar.h> 122#include <sys/errno.h> 123#include <sys/time.h> 124#include <sys/kernel.h> 125#include <sys/pool.h> 126#include <sys/sysctl.h> 127 128#include <net/if.h> 129#include <net/if_dl.h> 130#include <net/route.h> 131#include <net/pfil.h> 132 133#include <netinet/in.h> 134#include <netinet/in_systm.h> 135#include <netinet/ip.h> 136#include <netinet/in_pcb.h> 137#include <netinet/in_var.h> 138#include <netinet/ip_var.h> 139#include <netinet/ip_icmp.h> 140/* just for gif_ttl */ 141#include <netinet/in_gif.h> 142#include "gif.h" 143#include <net/if_gre.h> 144#include "gre.h" 145 146#ifdef MROUTING 147#include <netinet/ip_mroute.h> 148#endif 149 150#ifdef IPSEC 151#include <netinet6/ipsec.h> 152#include <netkey/key.h> 153#endif 154 155#ifndef IPFORWARDING 156#ifdef GATEWAY 157#define IPFORWARDING 1 /* forward IP packets not for us */ 158#else /* GATEWAY */ 159#define IPFORWARDING 0 /* don't forward IP packets not for us */ 160#endif /* GATEWAY */ 161#endif /* IPFORWARDING */ 162#ifndef IPSENDREDIRECTS 163#define IPSENDREDIRECTS 1 164#endif 165#ifndef IPFORWSRCRT 166#define IPFORWSRCRT 1 /* forward source-routed packets */ 167#endif 168#ifndef IPALLOWSRCRT 169#define IPALLOWSRCRT 1 /* allow source-routed packets */ 170#endif 171#ifndef IPMTUDISC 172#define IPMTUDISC 1 173#endif 174#ifndef IPMTUDISCTIMEOUT 175#define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 176#endif 177 178/* 179 * Note: DIRECTED_BROADCAST is handled this way so that previous 180 * configuration using this option will Just Work. 181 */ 182#ifndef IPDIRECTEDBCAST 183#ifdef DIRECTED_BROADCAST 184#define IPDIRECTEDBCAST 1 185#else 186#define IPDIRECTEDBCAST 0 187#endif /* DIRECTED_BROADCAST */ 188#endif /* IPDIRECTEDBCAST */ 189int ipforwarding = IPFORWARDING; 190int ipsendredirects = IPSENDREDIRECTS; 191int ip_defttl = IPDEFTTL; 192int ip_forwsrcrt = IPFORWSRCRT; 193int ip_directedbcast = IPDIRECTEDBCAST; 194int ip_allowsrcrt = IPALLOWSRCRT; 195int ip_mtudisc = IPMTUDISC; 196int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; 197#ifdef DIAGNOSTIC 198int ipprintfs = 0; 199#endif 200/* 201 * XXX - Setting ip_checkinterface mostly implements the receive side of 202 * the Strong ES model described in RFC 1122, but since the routing table 203 * and transmit implementation do not implement the Strong ES model, 204 * setting this to 1 results in an odd hybrid. 205 * 206 * XXX - ip_checkinterface currently must be disabled if you use ipnat 207 * to translate the destination address to another local interface. 208 * 209 * XXX - ip_checkinterface must be disabled if you add IP aliases 210 * to the loopback interface instead of the interface where the 211 * packets for those addresses are received. 212 */ 213int ip_checkinterface = 0; 214 215 216struct rttimer_queue *ip_mtudisc_timeout_q = NULL; 217 218extern struct domain inetdomain; 219int ipqmaxlen = IFQ_MAXLEN; 220u_long in_ifaddrhash; /* size of hash table - 1 */ 221int in_ifaddrentries; /* total number of addrs */ 222struct in_ifaddrhead in_ifaddr; 223struct in_ifaddrhashhead *in_ifaddrhashtbl; 224u_long in_multihash; /* size of hash table - 1 */ 225int in_multientries; /* total number of addrs */ 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 int srcrt = 0; 436 437 MCLAIM(m, &ip_rx_mowner); 438#ifdef DIAGNOSTIC 439 if ((m->m_flags & M_PKTHDR) == 0) 440 panic("ipintr no HDR"); 441#endif 442#ifdef IPSEC 443 /* 444 * should the inner packet be considered authentic? 445 * see comment in ah4_input(). 446 */ 447 if (m) { 448 m->m_flags &= ~M_AUTHIPHDR; 449 m->m_flags &= ~M_AUTHIPDGM; 450 } 451#endif 452 453 /* 454 * If no IP addresses have been set yet but the interfaces 455 * are receiving, can't do anything with incoming packets yet. 456 */ 457 if (TAILQ_FIRST(&in_ifaddr) == 0) 458 goto bad; 459 ipstat.ips_total++; 460 /* 461 * If the IP header is not aligned, slurp it up into a new 462 * mbuf with space for link headers, in the event we forward 463 * it. Otherwise, if it is aligned, make sure the entire 464 * base IP header is in the first mbuf of the chain. 465 */ 466 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 467 if ((m = m_copyup(m, sizeof(struct ip), 468 (max_linkhdr + 3) & ~3)) == NULL) { 469 /* XXXJRT new stat, please */ 470 ipstat.ips_toosmall++; 471 return; 472 } 473 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 474 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 475 ipstat.ips_toosmall++; 476 return; 477 } 478 } 479 ip = mtod(m, struct ip *); 480 if (ip->ip_v != IPVERSION) { 481 ipstat.ips_badvers++; 482 goto bad; 483 } 484 hlen = ip->ip_hl << 2; 485 if (hlen < sizeof(struct ip)) { /* minimum header length */ 486 ipstat.ips_badhlen++; 487 goto bad; 488 } 489 if (hlen > m->m_len) { 490 if ((m = m_pullup(m, hlen)) == 0) { 491 ipstat.ips_badhlen++; 492 return; 493 } 494 ip = mtod(m, struct ip *); 495 } 496 497 /* 498 * RFC1122: packets with a multicast source address are 499 * not allowed. 500 */ 501 if (IN_MULTICAST(ip->ip_src.s_addr)) { 502 ipstat.ips_badaddr++; 503 goto bad; 504 } 505 506 /* 127/8 must not appear on wire - RFC1122 */ 507 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 508 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 509 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 510 ipstat.ips_badaddr++; 511 goto bad; 512 } 513 } 514 515 switch (m->m_pkthdr.csum_flags & 516 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 517 M_CSUM_IPv4_BAD)) { 518 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 519 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 520 goto badcsum; 521 522 case M_CSUM_IPv4: 523 /* Checksum was okay. */ 524 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 525 break; 526 527 default: 528 /* Must compute it ourselves. */ 529 INET_CSUM_COUNTER_INCR(&ip_swcsum); 530 if (in_cksum(m, hlen) != 0) 531 goto bad; 532 break; 533 } 534 535 /* Retrieve the packet length. */ 536 len = ntohs(ip->ip_len); 537 538 /* 539 * Check for additional length bogosity 540 */ 541 if (len < hlen) { 542 ipstat.ips_badlen++; 543 goto bad; 544 } 545 546 /* 547 * Check that the amount of data in the buffers 548 * is as at least much as the IP header would have us expect. 549 * Trim mbufs if longer than we expect. 550 * Drop packet if shorter than we expect. 551 */ 552 if (m->m_pkthdr.len < len) { 553 ipstat.ips_tooshort++; 554 goto bad; 555 } 556 if (m->m_pkthdr.len > len) { 557 if (m->m_len == m->m_pkthdr.len) { 558 m->m_len = len; 559 m->m_pkthdr.len = len; 560 } else 561 m_adj(m, len - m->m_pkthdr.len); 562 } 563 564#ifdef IPSEC 565 /* ipflow (IP fast forwarding) is not compatible with IPsec. */ 566 m->m_flags &= ~M_CANFASTFWD; 567#else 568 /* 569 * Assume that we can create a fast-forward IP flow entry 570 * based on this packet. 571 */ 572 m->m_flags |= M_CANFASTFWD; 573#endif 574 575#ifdef PFIL_HOOKS 576 /* 577 * Run through list of hooks for input packets. If there are any 578 * filters which require that additional packets in the flow are 579 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 580 * Note that filters must _never_ set this flag, as another filter 581 * in the list may have previously cleared it. 582 */ 583 /* 584 * let ipfilter look at packet on the wire, 585 * not the decapsulated packet. 586 */ 587#ifdef IPSEC 588 if (!ipsec_getnhist(m)) 589#else 590 if (1) 591#endif 592 { 593 struct in_addr odst; 594 595 odst = ip->ip_dst; 596 if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif, 597 PFIL_IN) != 0) 598 return; 599 if (m == NULL) 600 return; 601 ip = mtod(m, struct ip *); 602 hlen = ip->ip_hl << 2; 603 srcrt = (odst.s_addr != ip->ip_dst.s_addr); 604 } 605#endif /* PFIL_HOOKS */ 606 607#ifdef ALTQ 608 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 609 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) { 610 /* packet dropped by traffic conditioner */ 611 return; 612 } 613#endif 614 615 /* 616 * Process options and, if not destined for us, 617 * ship it on. ip_dooptions returns 1 when an 618 * error was detected (causing an icmp message 619 * to be sent and the original packet to be freed). 620 */ 621 ip_nhops = 0; /* for source routed packets */ 622 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 623 return; 624 625 /* 626 * Enable a consistency check between the destination address 627 * and the arrival interface for a unicast packet (the RFC 1122 628 * strong ES model) if IP forwarding is disabled and the packet 629 * is not locally generated. 630 * 631 * XXX - Checking also should be disabled if the destination 632 * address is ipnat'ed to a different interface. 633 * 634 * XXX - Checking is incompatible with IP aliases added 635 * to the loopback interface instead of the interface where 636 * the packets are received. 637 * 638 * XXX - We need to add a per ifaddr flag for this so that 639 * we get finer grain control. 640 */ 641 checkif = ip_checkinterface && (ipforwarding == 0) && 642 (m->m_pkthdr.rcvif != NULL) && 643 ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0); 644 645 /* 646 * Check our list of addresses, to see if the packet is for us. 647 * 648 * Traditional 4.4BSD did not consult IFF_UP at all. 649 * The behavior here is to treat addresses on !IFF_UP interface 650 * as not mine. 651 */ 652 downmatch = 0; 653 LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 654 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 655 if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif) 656 continue; 657 if ((ia->ia_ifp->if_flags & IFF_UP) != 0) 658 break; 659 else 660 downmatch++; 661 } 662 } 663 if (ia != NULL) 664 goto ours; 665 if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { 666 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) { 667 if (ifa->ifa_addr->sa_family != AF_INET) 668 continue; 669 ia = ifatoia(ifa); 670 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 671 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 672 /* 673 * Look for all-0's host part (old broadcast addr), 674 * either for subnet or net. 675 */ 676 ip->ip_dst.s_addr == ia->ia_subnet || 677 ip->ip_dst.s_addr == ia->ia_net) 678 goto ours; 679 /* 680 * An interface with IP address zero accepts 681 * all packets that arrive on that interface. 682 */ 683 if (in_nullhost(ia->ia_addr.sin_addr)) 684 goto ours; 685 } 686 } 687 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 688 struct in_multi *inm; 689#ifdef MROUTING 690 extern struct socket *ip_mrouter; 691 692 if (M_READONLY(m)) { 693 if ((m = m_pullup(m, hlen)) == 0) { 694 ipstat.ips_toosmall++; 695 return; 696 } 697 ip = mtod(m, struct ip *); 698 } 699 700 if (ip_mrouter) { 701 /* 702 * If we are acting as a multicast router, all 703 * incoming multicast packets are passed to the 704 * kernel-level multicast forwarding function. 705 * The packet is returned (relatively) intact; if 706 * ip_mforward() returns a non-zero value, the packet 707 * must be discarded, else it may be accepted below. 708 * 709 * (The IP ident field is put in the same byte order 710 * as expected when ip_mforward() is called from 711 * ip_output().) 712 */ 713 if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { 714 ipstat.ips_cantforward++; 715 m_freem(m); 716 return; 717 } 718 719 /* 720 * The process-level routing demon needs to receive 721 * all multicast IGMP packets, whether or not this 722 * host belongs to their destination groups. 723 */ 724 if (ip->ip_p == IPPROTO_IGMP) 725 goto ours; 726 ipstat.ips_forward++; 727 } 728#endif 729 /* 730 * See if we belong to the destination multicast group on the 731 * arrival interface. 732 */ 733 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 734 if (inm == NULL) { 735 ipstat.ips_cantforward++; 736 m_freem(m); 737 return; 738 } 739 goto ours; 740 } 741 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 742 in_nullhost(ip->ip_dst)) 743 goto ours; 744 745 /* 746 * Not for us; forward if possible and desirable. 747 */ 748 if (ipforwarding == 0) { 749 ipstat.ips_cantforward++; 750 m_freem(m); 751 } else { 752 /* 753 * If ip_dst matched any of my address on !IFF_UP interface, 754 * and there's no IFF_UP interface that matches ip_dst, 755 * send icmp unreach. Forwarding it will result in in-kernel 756 * forwarding loop till TTL goes to 0. 757 */ 758 if (downmatch) { 759 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 760 ipstat.ips_cantforward++; 761 return; 762 } 763#ifdef IPSEC 764 if (ipsec4_in_reject(m, NULL)) { 765 ipsecstat.in_polvio++; 766 goto bad; 767 } 768#endif 769 770 ip_forward(m, srcrt); 771 } 772 return; 773 774ours: 775 /* 776 * If offset or IP_MF are set, must reassemble. 777 * Otherwise, nothing need be done. 778 * (We could look in the reassembly queue to see 779 * if the packet was previously fragmented, 780 * but it's not worth the time; just let them time out.) 781 */ 782 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 783 if (M_READONLY(m)) { 784 if ((m = m_pullup(m, hlen)) == NULL) { 785 ipstat.ips_toosmall++; 786 goto bad; 787 } 788 ip = mtod(m, struct ip *); 789 } 790 791 /* 792 * Look for queue of fragments 793 * of this datagram. 794 */ 795 IPQ_LOCK(); 796 LIST_FOREACH(fp, &ipq, ipq_q) 797 if (ip->ip_id == fp->ipq_id && 798 in_hosteq(ip->ip_src, fp->ipq_src) && 799 in_hosteq(ip->ip_dst, fp->ipq_dst) && 800 ip->ip_p == fp->ipq_p) 801 goto found; 802 fp = 0; 803found: 804 805 /* 806 * Adjust ip_len to not reflect header, 807 * set ipqe_mff if more fragments are expected, 808 * convert offset of this to bytes. 809 */ 810 ip->ip_len = htons(ntohs(ip->ip_len) - hlen); 811 mff = (ip->ip_off & htons(IP_MF)) != 0; 812 if (mff) { 813 /* 814 * Make sure that fragments have a data length 815 * that's a non-zero multiple of 8 bytes. 816 */ 817 if (ntohs(ip->ip_len) == 0 || 818 (ntohs(ip->ip_len) & 0x7) != 0) { 819 ipstat.ips_badfrags++; 820 IPQ_UNLOCK(); 821 goto bad; 822 } 823 } 824 ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3); 825 826 /* 827 * If datagram marked as having more fragments 828 * or if this is not the first fragment, 829 * attempt reassembly; if it succeeds, proceed. 830 */ 831 if (mff || ip->ip_off != htons(0)) { 832 ipstat.ips_fragments++; 833 ipqe = pool_get(&ipqent_pool, PR_NOWAIT); 834 if (ipqe == NULL) { 835 ipstat.ips_rcvmemdrop++; 836 IPQ_UNLOCK(); 837 goto bad; 838 } 839 ipqe->ipqe_mff = mff; 840 ipqe->ipqe_m = m; 841 ipqe->ipqe_ip = ip; 842 m = ip_reass(ipqe, fp); 843 if (m == 0) { 844 IPQ_UNLOCK(); 845 return; 846 } 847 ipstat.ips_reassembled++; 848 ip = mtod(m, struct ip *); 849 hlen = ip->ip_hl << 2; 850 ip->ip_len = htons(ntohs(ip->ip_len) + hlen); 851 } else 852 if (fp) 853 ip_freef(fp); 854 IPQ_UNLOCK(); 855 } 856 857#ifdef IPSEC 858 /* 859 * enforce IPsec policy checking if we are seeing last header. 860 * note that we do not visit this with protocols with pcb layer 861 * code - like udp/tcp/raw ip. 862 */ 863 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 && 864 ipsec4_in_reject(m, NULL)) { 865 ipsecstat.in_polvio++; 866 goto bad; 867 } 868#endif 869 870 /* 871 * Switch out to protocol's input routine. 872 */ 873#if IFA_STATS 874 if (ia && ip) 875 ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 876#endif 877 ipstat.ips_delivered++; 878 { 879 int off = hlen, nh = ip->ip_p; 880 881 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 882 return; 883 } 884bad: 885 m_freem(m); 886 return; 887 888badcsum: 889 ipstat.ips_badsum++; 890 m_freem(m); 891} 892 893/* 894 * Take incoming datagram fragment and try to 895 * reassemble it into whole datagram. If a chain for 896 * reassembly of this datagram already exists, then it 897 * is given as fp; otherwise have to make a chain. 898 */ 899struct mbuf * 900ip_reass(ipqe, fp) 901 struct ipqent *ipqe; 902 struct ipq *fp; 903{ 904 struct mbuf *m = ipqe->ipqe_m; 905 struct ipqent *nq, *p, *q; 906 struct ip *ip; 907 struct mbuf *t; 908 int hlen = ipqe->ipqe_ip->ip_hl << 2; 909 int i, next; 910 911 IPQ_LOCK_CHECK(); 912 913 /* 914 * Presence of header sizes in mbufs 915 * would confuse code below. 916 */ 917 m->m_data += hlen; 918 m->m_len -= hlen; 919 920 /* 921 * If first fragment to arrive, create a reassembly queue. 922 */ 923 if (fp == 0) { 924 /* 925 * Enforce upper bound on number of fragmented packets 926 * for which we attempt reassembly; 927 * If maxfrag is 0, never accept fragments. 928 * If maxfrag is -1, accept all fragments without limitation. 929 */ 930 if (ip_maxfragpackets < 0) 931 ; 932 else if (ip_nfragpackets >= ip_maxfragpackets) 933 goto dropfrag; 934 ip_nfragpackets++; 935 MALLOC(fp, struct ipq *, sizeof (struct ipq), 936 M_FTABLE, M_NOWAIT); 937 if (fp == NULL) 938 goto dropfrag; 939 LIST_INSERT_HEAD(&ipq, fp, ipq_q); 940 fp->ipq_ttl = IPFRAGTTL; 941 fp->ipq_p = ipqe->ipqe_ip->ip_p; 942 fp->ipq_id = ipqe->ipqe_ip->ip_id; 943 TAILQ_INIT(&fp->ipq_fragq); 944 fp->ipq_src = ipqe->ipqe_ip->ip_src; 945 fp->ipq_dst = ipqe->ipqe_ip->ip_dst; 946 p = NULL; 947 goto insert; 948 } 949 950 /* 951 * Find a segment which begins after this one does. 952 */ 953 for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; 954 p = q, q = TAILQ_NEXT(q, ipqe_q)) 955 if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off)) 956 break; 957 958 /* 959 * If there is a preceding segment, it may provide some of 960 * our data already. If so, drop the data from the incoming 961 * segment. If it provides all of our data, drop us. 962 */ 963 if (p != NULL) { 964 i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) - 965 ntohs(ipqe->ipqe_ip->ip_off); 966 if (i > 0) { 967 if (i >= ntohs(ipqe->ipqe_ip->ip_len)) 968 goto dropfrag; 969 m_adj(ipqe->ipqe_m, i); 970 ipqe->ipqe_ip->ip_off = 971 htons(ntohs(ipqe->ipqe_ip->ip_off) + i); 972 ipqe->ipqe_ip->ip_len = 973 htons(ntohs(ipqe->ipqe_ip->ip_len) - i); 974 } 975 } 976 977 /* 978 * While we overlap succeeding segments trim them or, 979 * if they are completely covered, dequeue them. 980 */ 981 for (; q != NULL && 982 ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) > 983 ntohs(q->ipqe_ip->ip_off); q = nq) { 984 i = (ntohs(ipqe->ipqe_ip->ip_off) + 985 ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off); 986 if (i < ntohs(q->ipqe_ip->ip_len)) { 987 q->ipqe_ip->ip_len = 988 htons(ntohs(q->ipqe_ip->ip_len) - i); 989 q->ipqe_ip->ip_off = 990 htons(ntohs(q->ipqe_ip->ip_off) + i); 991 m_adj(q->ipqe_m, i); 992 break; 993 } 994 nq = TAILQ_NEXT(q, ipqe_q); 995 m_freem(q->ipqe_m); 996 TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q); 997 pool_put(&ipqent_pool, q); 998 } 999 1000insert: 1001 /* 1002 * Stick new segment in its place; 1003 * check for complete reassembly. 1004 */ 1005 if (p == NULL) { 1006 TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q); 1007 } else { 1008 TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q); 1009 } 1010 next = 0; 1011 for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; 1012 p = q, q = TAILQ_NEXT(q, ipqe_q)) { 1013 if (ntohs(q->ipqe_ip->ip_off) != next) 1014 return (0); 1015 next += ntohs(q->ipqe_ip->ip_len); 1016 } 1017 if (p->ipqe_mff) 1018 return (0); 1019 1020 /* 1021 * Reassembly is complete. Check for a bogus message size and 1022 * concatenate fragments. 1023 */ 1024 q = TAILQ_FIRST(&fp->ipq_fragq); 1025 ip = q->ipqe_ip; 1026 if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) { 1027 ipstat.ips_toolong++; 1028 ip_freef(fp); 1029 return (0); 1030 } 1031 m = q->ipqe_m; 1032 t = m->m_next; 1033 m->m_next = 0; 1034 m_cat(m, t); 1035 nq = TAILQ_NEXT(q, ipqe_q); 1036 pool_put(&ipqent_pool, q); 1037 for (q = nq; q != NULL; q = nq) { 1038 t = q->ipqe_m; 1039 nq = TAILQ_NEXT(q, ipqe_q); 1040 pool_put(&ipqent_pool, q); 1041 m_cat(m, t); 1042 } 1043 1044 /* 1045 * Create header for new ip packet by 1046 * modifying header of first packet; 1047 * dequeue and discard fragment reassembly header. 1048 * Make header visible. 1049 */ 1050 ip->ip_len = htons(next); 1051 ip->ip_src = fp->ipq_src; 1052 ip->ip_dst = fp->ipq_dst; 1053 LIST_REMOVE(fp, ipq_q); 1054 FREE(fp, M_FTABLE); 1055 ip_nfragpackets--; 1056 m->m_len += (ip->ip_hl << 2); 1057 m->m_data -= (ip->ip_hl << 2); 1058 /* some debugging cruft by sklower, below, will go away soon */ 1059 if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */ 1060 int plen = 0; 1061 for (t = m; t; t = t->m_next) 1062 plen += t->m_len; 1063 m->m_pkthdr.len = plen; 1064 } 1065 return (m); 1066 1067dropfrag: 1068 ipstat.ips_fragdropped++; 1069 m_freem(m); 1070 pool_put(&ipqent_pool, ipqe); 1071 return (0); 1072} 1073 1074/* 1075 * Free a fragment reassembly header and all 1076 * associated datagrams. 1077 */ 1078void 1079ip_freef(fp) 1080 struct ipq *fp; 1081{ 1082 struct ipqent *q, *p; 1083 1084 IPQ_LOCK_CHECK(); 1085 1086 for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) { 1087 p = TAILQ_NEXT(q, ipqe_q); 1088 m_freem(q->ipqe_m); 1089 TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q); 1090 pool_put(&ipqent_pool, q); 1091 } 1092 LIST_REMOVE(fp, ipq_q); 1093 FREE(fp, M_FTABLE); 1094 ip_nfragpackets--; 1095} 1096 1097/* 1098 * IP timer processing; 1099 * if a timer expires on a reassembly 1100 * queue, discard it. 1101 */ 1102void 1103ip_slowtimo() 1104{ 1105 struct ipq *fp, *nfp; 1106 int s = splsoftnet(); 1107 1108 IPQ_LOCK(); 1109 for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) { 1110 nfp = LIST_NEXT(fp, ipq_q); 1111 if (--fp->ipq_ttl == 0) { 1112 ipstat.ips_fragtimeout++; 1113 ip_freef(fp); 1114 } 1115 } 1116 /* 1117 * If we are over the maximum number of fragments 1118 * (due to the limit being lowered), drain off 1119 * enough to get down to the new limit. 1120 */ 1121 if (ip_maxfragpackets < 0) 1122 ; 1123 else { 1124 while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq)) 1125 ip_freef(LIST_FIRST(&ipq)); 1126 } 1127 IPQ_UNLOCK(); 1128#ifdef GATEWAY 1129 ipflow_slowtimo(); 1130#endif 1131 splx(s); 1132} 1133 1134/* 1135 * Drain off all datagram fragments. 1136 */ 1137void 1138ip_drain() 1139{ 1140 1141 /* 1142 * We may be called from a device's interrupt context. If 1143 * the ipq is already busy, just bail out now. 1144 */ 1145 if (ipq_lock_try() == 0) 1146 return; 1147 1148 while (LIST_FIRST(&ipq) != NULL) { 1149 ipstat.ips_fragdropped++; 1150 ip_freef(LIST_FIRST(&ipq)); 1151 } 1152 1153 IPQ_UNLOCK(); 1154} 1155 1156/* 1157 * Do option processing on a datagram, 1158 * possibly discarding it if bad options are encountered, 1159 * or forwarding it if source-routed. 1160 * Returns 1 if packet has been forwarded/freed, 1161 * 0 if the packet should be processed further. 1162 */ 1163int 1164ip_dooptions(m) 1165 struct mbuf *m; 1166{ 1167 struct ip *ip = mtod(m, struct ip *); 1168 u_char *cp, *cp0; 1169 struct ip_timestamp *ipt; 1170 struct in_ifaddr *ia; 1171 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 1172 struct in_addr dst; 1173 n_time ntime; 1174 1175 dst = ip->ip_dst; 1176 cp = (u_char *)(ip + 1); 1177 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 1178 for (; cnt > 0; cnt -= optlen, cp += optlen) { 1179 opt = cp[IPOPT_OPTVAL]; 1180 if (opt == IPOPT_EOL) 1181 break; 1182 if (opt == IPOPT_NOP) 1183 optlen = 1; 1184 else { 1185 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 1186 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1187 goto bad; 1188 } 1189 optlen = cp[IPOPT_OLEN]; 1190 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 1191 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1192 goto bad; 1193 } 1194 } 1195 switch (opt) { 1196 1197 default: 1198 break; 1199 1200 /* 1201 * Source routing with record. 1202 * Find interface with current destination address. 1203 * If none on this machine then drop if strictly routed, 1204 * or do nothing if loosely routed. 1205 * Record interface address and bring up next address 1206 * component. If strictly routed make sure next 1207 * address is on directly accessible net. 1208 */ 1209 case IPOPT_LSRR: 1210 case IPOPT_SSRR: 1211 if (ip_allowsrcrt == 0) { 1212 type = ICMP_UNREACH; 1213 code = ICMP_UNREACH_NET_PROHIB; 1214 goto bad; 1215 } 1216 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1217 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1218 goto bad; 1219 } 1220 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1221 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1222 goto bad; 1223 } 1224 ipaddr.sin_addr = ip->ip_dst; 1225 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 1226 if (ia == 0) { 1227 if (opt == IPOPT_SSRR) { 1228 type = ICMP_UNREACH; 1229 code = ICMP_UNREACH_SRCFAIL; 1230 goto bad; 1231 } 1232 /* 1233 * Loose routing, and not at next destination 1234 * yet; nothing to do except forward. 1235 */ 1236 break; 1237 } 1238 off--; /* 0 origin */ 1239 if ((off + sizeof(struct in_addr)) > optlen) { 1240 /* 1241 * End of source route. Should be for us. 1242 */ 1243 save_rte(cp, ip->ip_src); 1244 break; 1245 } 1246 /* 1247 * locate outgoing interface 1248 */ 1249 bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr, 1250 sizeof(ipaddr.sin_addr)); 1251 if (opt == IPOPT_SSRR) 1252 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 1253 else 1254 ia = ip_rtaddr(ipaddr.sin_addr); 1255 if (ia == 0) { 1256 type = ICMP_UNREACH; 1257 code = ICMP_UNREACH_SRCFAIL; 1258 goto bad; 1259 } 1260 ip->ip_dst = ipaddr.sin_addr; 1261 bcopy((caddr_t)&ia->ia_addr.sin_addr, 1262 (caddr_t)(cp + off), sizeof(struct in_addr)); 1263 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1264 /* 1265 * Let ip_intr's mcast routing check handle mcast pkts 1266 */ 1267 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 1268 break; 1269 1270 case IPOPT_RR: 1271 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1272 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1273 goto bad; 1274 } 1275 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1276 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1277 goto bad; 1278 } 1279 /* 1280 * If no space remains, ignore. 1281 */ 1282 off--; /* 0 origin */ 1283 if ((off + sizeof(struct in_addr)) > optlen) 1284 break; 1285 bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr, 1286 sizeof(ipaddr.sin_addr)); 1287 /* 1288 * locate outgoing interface; if we're the destination, 1289 * use the incoming interface (should be same). 1290 */ 1291 if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))) 1292 == NULL && 1293 (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) { 1294 type = ICMP_UNREACH; 1295 code = ICMP_UNREACH_HOST; 1296 goto bad; 1297 } 1298 bcopy((caddr_t)&ia->ia_addr.sin_addr, 1299 (caddr_t)(cp + off), sizeof(struct in_addr)); 1300 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1301 break; 1302 1303 case IPOPT_TS: 1304 code = cp - (u_char *)ip; 1305 ipt = (struct ip_timestamp *)cp; 1306 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1307 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1308 goto bad; 1309 } 1310 if (ipt->ipt_ptr < 5) { 1311 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1312 goto bad; 1313 } 1314 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 1315 if (++ipt->ipt_oflw == 0) { 1316 code = (u_char *)&ipt->ipt_ptr - 1317 (u_char *)ip; 1318 goto bad; 1319 } 1320 break; 1321 } 1322 cp0 = (cp + ipt->ipt_ptr - 1); 1323 switch (ipt->ipt_flg) { 1324 1325 case IPOPT_TS_TSONLY: 1326 break; 1327 1328 case IPOPT_TS_TSANDADDR: 1329 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1330 sizeof(struct in_addr) > ipt->ipt_len) { 1331 code = (u_char *)&ipt->ipt_ptr - 1332 (u_char *)ip; 1333 goto bad; 1334 } 1335 ipaddr.sin_addr = dst; 1336 ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr), 1337 m->m_pkthdr.rcvif)); 1338 if (ia == 0) 1339 continue; 1340 bcopy(&ia->ia_addr.sin_addr, 1341 cp0, sizeof(struct in_addr)); 1342 ipt->ipt_ptr += sizeof(struct in_addr); 1343 break; 1344 1345 case IPOPT_TS_PRESPEC: 1346 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1347 sizeof(struct in_addr) > ipt->ipt_len) { 1348 code = (u_char *)&ipt->ipt_ptr - 1349 (u_char *)ip; 1350 goto bad; 1351 } 1352 bcopy(cp0, &ipaddr.sin_addr, 1353 sizeof(struct in_addr)); 1354 if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))) 1355 == NULL) 1356 continue; 1357 ipt->ipt_ptr += sizeof(struct in_addr); 1358 break; 1359 1360 default: 1361 /* XXX can't take &ipt->ipt_flg */ 1362 code = (u_char *)&ipt->ipt_ptr - 1363 (u_char *)ip + 1; 1364 goto bad; 1365 } 1366 ntime = iptime(); 1367 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1368 bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1, 1369 sizeof(n_time)); 1370 ipt->ipt_ptr += sizeof(n_time); 1371 } 1372 } 1373 if (forward) { 1374 if (ip_forwsrcrt == 0) { 1375 type = ICMP_UNREACH; 1376 code = ICMP_UNREACH_SRCFAIL; 1377 goto bad; 1378 } 1379 ip_forward(m, 1); 1380 return (1); 1381 } 1382 return (0); 1383bad: 1384 icmp_error(m, type, code, 0, 0); 1385 ipstat.ips_badoptions++; 1386 return (1); 1387} 1388 1389/* 1390 * Given address of next destination (final or next hop), 1391 * return internet address info of interface to be used to get there. 1392 */ 1393struct in_ifaddr * 1394ip_rtaddr(dst) 1395 struct in_addr dst; 1396{ 1397 struct sockaddr_in *sin; 1398 1399 sin = satosin(&ipforward_rt.ro_dst); 1400 1401 if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) { 1402 if (ipforward_rt.ro_rt) { 1403 RTFREE(ipforward_rt.ro_rt); 1404 ipforward_rt.ro_rt = 0; 1405 } 1406 sin->sin_family = AF_INET; 1407 sin->sin_len = sizeof(*sin); 1408 sin->sin_addr = dst; 1409 1410 rtalloc(&ipforward_rt); 1411 } 1412 if (ipforward_rt.ro_rt == 0) 1413 return ((struct in_ifaddr *)0); 1414 return (ifatoia(ipforward_rt.ro_rt->rt_ifa)); 1415} 1416 1417/* 1418 * Save incoming source route for use in replies, 1419 * to be picked up later by ip_srcroute if the receiver is interested. 1420 */ 1421void 1422save_rte(option, dst) 1423 u_char *option; 1424 struct in_addr dst; 1425{ 1426 unsigned olen; 1427 1428 olen = option[IPOPT_OLEN]; 1429#ifdef DIAGNOSTIC 1430 if (ipprintfs) 1431 printf("save_rte: olen %d\n", olen); 1432#endif /* 0 */ 1433 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1434 return; 1435 bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen); 1436 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1437 ip_srcrt.dst = dst; 1438} 1439 1440/* 1441 * Retrieve incoming source route for use in replies, 1442 * in the same form used by setsockopt. 1443 * The first hop is placed before the options, will be removed later. 1444 */ 1445struct mbuf * 1446ip_srcroute() 1447{ 1448 struct in_addr *p, *q; 1449 struct mbuf *m; 1450 1451 if (ip_nhops == 0) 1452 return ((struct mbuf *)0); 1453 m = m_get(M_DONTWAIT, MT_SOOPTS); 1454 if (m == 0) 1455 return ((struct mbuf *)0); 1456 1457 MCLAIM(m, &inetdomain.dom_mowner); 1458#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1459 1460 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1461 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1462 OPTSIZ; 1463#ifdef DIAGNOSTIC 1464 if (ipprintfs) 1465 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1466#endif 1467 1468 /* 1469 * First save first hop for return route 1470 */ 1471 p = &ip_srcrt.route[ip_nhops - 1]; 1472 *(mtod(m, struct in_addr *)) = *p--; 1473#ifdef DIAGNOSTIC 1474 if (ipprintfs) 1475 printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr)); 1476#endif 1477 1478 /* 1479 * Copy option fields and padding (nop) to mbuf. 1480 */ 1481 ip_srcrt.nop = IPOPT_NOP; 1482 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1483 bcopy((caddr_t)&ip_srcrt.nop, 1484 mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ); 1485 q = (struct in_addr *)(mtod(m, caddr_t) + 1486 sizeof(struct in_addr) + OPTSIZ); 1487#undef OPTSIZ 1488 /* 1489 * Record return path as an IP source route, 1490 * reversing the path (pointers are now aligned). 1491 */ 1492 while (p >= ip_srcrt.route) { 1493#ifdef DIAGNOSTIC 1494 if (ipprintfs) 1495 printf(" %x", ntohl(q->s_addr)); 1496#endif 1497 *q++ = *p--; 1498 } 1499 /* 1500 * Last hop goes to final destination. 1501 */ 1502 *q = ip_srcrt.dst; 1503#ifdef DIAGNOSTIC 1504 if (ipprintfs) 1505 printf(" %x\n", ntohl(q->s_addr)); 1506#endif 1507 return (m); 1508} 1509 1510/* 1511 * Strip out IP options, at higher 1512 * level protocol in the kernel. 1513 * Second argument is buffer to which options 1514 * will be moved, and return value is their length. 1515 * XXX should be deleted; last arg currently ignored. 1516 */ 1517void 1518ip_stripoptions(m, mopt) 1519 struct mbuf *m; 1520 struct mbuf *mopt; 1521{ 1522 int i; 1523 struct ip *ip = mtod(m, struct ip *); 1524 caddr_t opts; 1525 int olen; 1526 1527 olen = (ip->ip_hl << 2) - sizeof (struct ip); 1528 opts = (caddr_t)(ip + 1); 1529 i = m->m_len - (sizeof (struct ip) + olen); 1530 bcopy(opts + olen, opts, (unsigned)i); 1531 m->m_len -= olen; 1532 if (m->m_flags & M_PKTHDR) 1533 m->m_pkthdr.len -= olen; 1534 ip->ip_len = htons(ntohs(ip->ip_len) - olen); 1535 ip->ip_hl = sizeof (struct ip) >> 2; 1536} 1537 1538const int inetctlerrmap[PRC_NCMDS] = { 1539 0, 0, 0, 0, 1540 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1541 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1542 EMSGSIZE, EHOSTUNREACH, 0, 0, 1543 0, 0, 0, 0, 1544 ENOPROTOOPT 1545}; 1546 1547/* 1548 * Forward a packet. If some error occurs return the sender 1549 * an icmp packet. Note we can't always generate a meaningful 1550 * icmp message because icmp doesn't have a large enough repertoire 1551 * of codes and types. 1552 * 1553 * If not forwarding, just drop the packet. This could be confusing 1554 * if ipforwarding was zero but some routing protocol was advancing 1555 * us as a gateway to somewhere. However, we must let the routing 1556 * protocol deal with that. 1557 * 1558 * The srcrt parameter indicates whether the packet is being forwarded 1559 * via a source route. 1560 */ 1561void 1562ip_forward(m, srcrt) 1563 struct mbuf *m; 1564 int srcrt; 1565{ 1566 struct ip *ip = mtod(m, struct ip *); 1567 struct sockaddr_in *sin; 1568 struct rtentry *rt; 1569 int error, type = 0, code = 0; 1570 struct mbuf *mcopy; 1571 n_long dest; 1572 struct ifnet *destifp; 1573#ifdef IPSEC 1574 struct ifnet dummyifp; 1575#endif 1576 1577 /* 1578 * We are now in the output path. 1579 */ 1580 MCLAIM(m, &ip_tx_mowner); 1581 1582 /* 1583 * Clear any in-bound checksum flags for this packet. 1584 */ 1585 m->m_pkthdr.csum_flags = 0; 1586 1587 dest = 0; 1588#ifdef DIAGNOSTIC 1589 if (ipprintfs) 1590 printf("forward: src %2.2x dst %2.2x ttl %x\n", 1591 ntohl(ip->ip_src.s_addr), 1592 ntohl(ip->ip_dst.s_addr), ip->ip_ttl); 1593#endif 1594 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1595 ipstat.ips_cantforward++; 1596 m_freem(m); 1597 return; 1598 } 1599 if (ip->ip_ttl <= IPTTLDEC) { 1600 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1601 return; 1602 } 1603 ip->ip_ttl -= IPTTLDEC; 1604 1605 sin = satosin(&ipforward_rt.ro_dst); 1606 if ((rt = ipforward_rt.ro_rt) == 0 || 1607 !in_hosteq(ip->ip_dst, sin->sin_addr)) { 1608 if (ipforward_rt.ro_rt) { 1609 RTFREE(ipforward_rt.ro_rt); 1610 ipforward_rt.ro_rt = 0; 1611 } 1612 sin->sin_family = AF_INET; 1613 sin->sin_len = sizeof(struct sockaddr_in); 1614 sin->sin_addr = ip->ip_dst; 1615 1616 rtalloc(&ipforward_rt); 1617 if (ipforward_rt.ro_rt == 0) { 1618 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0); 1619 return; 1620 } 1621 rt = ipforward_rt.ro_rt; 1622 } 1623 1624 /* 1625 * Save at most 68 bytes of the packet in case 1626 * we need to generate an ICMP message to the src. 1627 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1628 */ 1629 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1630 if (mcopy) 1631 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1632 1633 /* 1634 * If forwarding packet using same interface that it came in on, 1635 * perhaps should send a redirect to sender to shortcut a hop. 1636 * Only send redirect if source is sending directly to us, 1637 * and if packet was not source routed (or has any options). 1638 * Also, don't send redirect if forwarding using a default route 1639 * or a route modified by a redirect. 1640 */ 1641 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1642 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1643 !in_nullhost(satosin(rt_key(rt))->sin_addr) && 1644 ipsendredirects && !srcrt) { 1645 if (rt->rt_ifa && 1646 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1647 ifatoia(rt->rt_ifa)->ia_subnet) { 1648 if (rt->rt_flags & RTF_GATEWAY) 1649 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1650 else 1651 dest = ip->ip_dst.s_addr; 1652 /* 1653 * Router requirements says to only send host 1654 * redirects. 1655 */ 1656 type = ICMP_REDIRECT; 1657 code = ICMP_REDIRECT_HOST; 1658#ifdef DIAGNOSTIC 1659 if (ipprintfs) 1660 printf("redirect (%d) to %x\n", code, 1661 (u_int32_t)dest); 1662#endif 1663 } 1664 } 1665 1666#ifdef IPSEC 1667 /* Don't lookup socket in forwarding case */ 1668 (void)ipsec_setsocket(m, NULL); 1669#endif 1670 error = ip_output(m, (struct mbuf *)0, &ipforward_rt, 1671 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0); 1672 if (error) 1673 ipstat.ips_cantforward++; 1674 else { 1675 ipstat.ips_forward++; 1676 if (type) 1677 ipstat.ips_redirectsent++; 1678 else { 1679 if (mcopy) { 1680#ifdef GATEWAY 1681 if (mcopy->m_flags & M_CANFASTFWD) 1682 ipflow_create(&ipforward_rt, mcopy); 1683#endif 1684 m_freem(mcopy); 1685 } 1686 return; 1687 } 1688 } 1689 if (mcopy == NULL) 1690 return; 1691 destifp = NULL; 1692 1693 switch (error) { 1694 1695 case 0: /* forwarded, but need redirect */ 1696 /* type, code set above */ 1697 break; 1698 1699 case ENETUNREACH: /* shouldn't happen, checked above */ 1700 case EHOSTUNREACH: 1701 case ENETDOWN: 1702 case EHOSTDOWN: 1703 default: 1704 type = ICMP_UNREACH; 1705 code = ICMP_UNREACH_HOST; 1706 break; 1707 1708 case EMSGSIZE: 1709 type = ICMP_UNREACH; 1710 code = ICMP_UNREACH_NEEDFRAG; 1711#ifndef IPSEC 1712 if (ipforward_rt.ro_rt) 1713 destifp = ipforward_rt.ro_rt->rt_ifp; 1714#else 1715 /* 1716 * If the packet is routed over IPsec tunnel, tell the 1717 * originator the tunnel MTU. 1718 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 1719 * XXX quickhack!!! 1720 */ 1721 if (ipforward_rt.ro_rt) { 1722 struct secpolicy *sp; 1723 int ipsecerror; 1724 size_t ipsechdr; 1725 struct route *ro; 1726 1727 sp = ipsec4_getpolicybyaddr(mcopy, 1728 IPSEC_DIR_OUTBOUND, IP_FORWARDING, 1729 &ipsecerror); 1730 1731 if (sp == NULL) 1732 destifp = ipforward_rt.ro_rt->rt_ifp; 1733 else { 1734 /* count IPsec header size */ 1735 ipsechdr = ipsec4_hdrsiz(mcopy, 1736 IPSEC_DIR_OUTBOUND, NULL); 1737 1738 /* 1739 * find the correct route for outer IPv4 1740 * header, compute tunnel MTU. 1741 * 1742 * XXX BUG ALERT 1743 * The "dummyifp" code relies upon the fact 1744 * that icmp_error() touches only ifp->if_mtu. 1745 */ 1746 /*XXX*/ 1747 destifp = NULL; 1748 if (sp->req != NULL 1749 && sp->req->sav != NULL 1750 && sp->req->sav->sah != NULL) { 1751 ro = &sp->req->sav->sah->sa_route; 1752 if (ro->ro_rt && ro->ro_rt->rt_ifp) { 1753 dummyifp.if_mtu = 1754 ro->ro_rt->rt_rmx.rmx_mtu ? 1755 ro->ro_rt->rt_rmx.rmx_mtu : 1756 ro->ro_rt->rt_ifp->if_mtu; 1757 dummyifp.if_mtu -= ipsechdr; 1758 destifp = &dummyifp; 1759 } 1760 } 1761 1762 key_freesp(sp); 1763 } 1764 } 1765#endif /*IPSEC*/ 1766 ipstat.ips_cantfrag++; 1767 break; 1768 1769 case ENOBUFS: 1770#if 1 1771 /* 1772 * a router should not generate ICMP_SOURCEQUENCH as 1773 * required in RFC1812 Requirements for IP Version 4 Routers. 1774 * source quench could be a big problem under DoS attacks, 1775 * or if the underlying interface is rate-limited. 1776 */ 1777 if (mcopy) 1778 m_freem(mcopy); 1779 return; 1780#else 1781 type = ICMP_SOURCEQUENCH; 1782 code = 0; 1783 break; 1784#endif 1785 } 1786 icmp_error(mcopy, type, code, dest, destifp); 1787} 1788 1789void 1790ip_savecontrol(inp, mp, ip, m) 1791 struct inpcb *inp; 1792 struct mbuf **mp; 1793 struct ip *ip; 1794 struct mbuf *m; 1795{ 1796 1797 if (inp->inp_socket->so_options & SO_TIMESTAMP) { 1798 struct timeval tv; 1799 1800 microtime(&tv); 1801 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1802 SCM_TIMESTAMP, SOL_SOCKET); 1803 if (*mp) 1804 mp = &(*mp)->m_next; 1805 } 1806 if (inp->inp_flags & INP_RECVDSTADDR) { 1807 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst, 1808 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1809 if (*mp) 1810 mp = &(*mp)->m_next; 1811 } 1812#ifdef notyet 1813 /* 1814 * XXX 1815 * Moving these out of udp_input() made them even more broken 1816 * than they already were. 1817 * - fenner@parc.xerox.com 1818 */ 1819 /* options were tossed already */ 1820 if (inp->inp_flags & INP_RECVOPTS) { 1821 *mp = sbcreatecontrol((caddr_t) opts_deleted_above, 1822 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1823 if (*mp) 1824 mp = &(*mp)->m_next; 1825 } 1826 /* ip_srcroute doesn't do what we want here, need to fix */ 1827 if (inp->inp_flags & INP_RECVRETOPTS) { 1828 *mp = sbcreatecontrol((caddr_t) ip_srcroute(), 1829 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1830 if (*mp) 1831 mp = &(*mp)->m_next; 1832 } 1833#endif 1834 if (inp->inp_flags & INP_RECVIF) { 1835 struct sockaddr_dl sdl; 1836 1837 sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]); 1838 sdl.sdl_family = AF_LINK; 1839 sdl.sdl_index = m->m_pkthdr.rcvif ? 1840 m->m_pkthdr.rcvif->if_index : 0; 1841 sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0; 1842 *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len, 1843 IP_RECVIF, IPPROTO_IP); 1844 if (*mp) 1845 mp = &(*mp)->m_next; 1846 } 1847} 1848 1849int 1850ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 1851 int *name; 1852 u_int namelen; 1853 void *oldp; 1854 size_t *oldlenp; 1855 void *newp; 1856 size_t newlen; 1857{ 1858 extern int subnetsarelocal, hostzeroisbroadcast; 1859 1860 int error, old; 1861 1862 /* All sysctl names at this level are terminal. */ 1863 if (namelen != 1) 1864 return (ENOTDIR); 1865 1866 switch (name[0]) { 1867 case IPCTL_FORWARDING: 1868 return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding)); 1869 case IPCTL_SENDREDIRECTS: 1870 return (sysctl_int(oldp, oldlenp, newp, newlen, 1871 &ipsendredirects)); 1872 case IPCTL_DEFTTL: 1873 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl)); 1874#ifdef notyet 1875 case IPCTL_DEFMTU: 1876 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu)); 1877#endif 1878 case IPCTL_FORWSRCRT: 1879 /* Don't allow this to change in a secure environment. */ 1880 if (securelevel > 0) 1881 return (sysctl_rdint(oldp, oldlenp, newp, 1882 ip_forwsrcrt)); 1883 else 1884 return (sysctl_int(oldp, oldlenp, newp, newlen, 1885 &ip_forwsrcrt)); 1886 case IPCTL_DIRECTEDBCAST: 1887 return (sysctl_int(oldp, oldlenp, newp, newlen, 1888 &ip_directedbcast)); 1889 case IPCTL_ALLOWSRCRT: 1890 return (sysctl_int(oldp, oldlenp, newp, newlen, 1891 &ip_allowsrcrt)); 1892 case IPCTL_SUBNETSARELOCAL: 1893 return (sysctl_int(oldp, oldlenp, newp, newlen, 1894 &subnetsarelocal)); 1895 case IPCTL_MTUDISC: 1896 error = sysctl_int(oldp, oldlenp, newp, newlen, 1897 &ip_mtudisc); 1898 if (error == 0 && ip_mtudisc == 0) 1899 rt_timer_queue_remove_all(ip_mtudisc_timeout_q, TRUE); 1900 return error; 1901 case IPCTL_ANONPORTMIN: 1902 old = anonportmin; 1903 error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin); 1904 if (anonportmin >= anonportmax || anonportmin < 0 1905 || anonportmin > 65535 1906#ifndef IPNOPRIVPORTS 1907 || anonportmin < IPPORT_RESERVED 1908#endif 1909 ) { 1910 anonportmin = old; 1911 return (EINVAL); 1912 } 1913 return (error); 1914 case IPCTL_ANONPORTMAX: 1915 old = anonportmax; 1916 error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax); 1917 if (anonportmin >= anonportmax || anonportmax < 0 1918 || anonportmax > 65535 1919#ifndef IPNOPRIVPORTS 1920 || anonportmax < IPPORT_RESERVED 1921#endif 1922 ) { 1923 anonportmax = old; 1924 return (EINVAL); 1925 } 1926 return (error); 1927 case IPCTL_MTUDISCTIMEOUT: 1928 old = ip_mtudisc_timeout; 1929 error = sysctl_int(oldp, oldlenp, newp, newlen, 1930 &ip_mtudisc_timeout); 1931 if (ip_mtudisc_timeout < 0) { 1932 ip_mtudisc_timeout = old; 1933 return (EINVAL); 1934 } 1935 if (error == 0) 1936 rt_timer_queue_change(ip_mtudisc_timeout_q, 1937 ip_mtudisc_timeout); 1938 return (error); 1939#ifdef GATEWAY 1940 case IPCTL_MAXFLOWS: 1941 { 1942 int s; 1943 1944 error = sysctl_int(oldp, oldlenp, newp, newlen, 1945 &ip_maxflows); 1946 s = splsoftnet(); 1947 ipflow_reap(0); 1948 splx(s); 1949 return (error); 1950 } 1951#endif 1952 case IPCTL_HOSTZEROBROADCAST: 1953 return (sysctl_int(oldp, oldlenp, newp, newlen, 1954 &hostzeroisbroadcast)); 1955#if NGIF > 0 1956 case IPCTL_GIF_TTL: 1957 return (sysctl_int(oldp, oldlenp, newp, newlen, 1958 &ip_gif_ttl)); 1959#endif 1960 1961#if NGRE > 0 1962 case IPCTL_GRE_TTL: 1963 return (sysctl_int(oldp, oldlenp, newp, newlen, 1964 &ip_gre_ttl)); 1965#endif 1966 1967#ifndef IPNOPRIVPORTS 1968 case IPCTL_LOWPORTMIN: 1969 old = lowportmin; 1970 error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin); 1971 if (lowportmin >= lowportmax 1972 || lowportmin > IPPORT_RESERVEDMAX 1973 || lowportmin < IPPORT_RESERVEDMIN 1974 ) { 1975 lowportmin = old; 1976 return (EINVAL); 1977 } 1978 return (error); 1979 case IPCTL_LOWPORTMAX: 1980 old = lowportmax; 1981 error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax); 1982 if (lowportmin >= lowportmax 1983 || lowportmax > IPPORT_RESERVEDMAX 1984 || lowportmax < IPPORT_RESERVEDMIN 1985 ) { 1986 lowportmax = old; 1987 return (EINVAL); 1988 } 1989 return (error); 1990#endif 1991 1992 case IPCTL_MAXFRAGPACKETS: 1993 return (sysctl_int(oldp, oldlenp, newp, newlen, 1994 &ip_maxfragpackets)); 1995 1996 case IPCTL_CHECKINTERFACE: 1997 return (sysctl_int(oldp, oldlenp, newp, newlen, 1998 &ip_checkinterface)); 1999 default: 2000 return (EOPNOTSUPP); 2001 } 2002 /* NOTREACHED */ 2003} 2004