ip_input.c revision 1.157
1/* $NetBSD: ip_input.c,v 1.157 2002/09/11 02:46:43 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 1.157 2002/09/11 02:46:43 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_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 200struct rttimer_queue *ip_mtudisc_timeout_q = NULL; 201 202extern struct domain inetdomain; 203int ipqmaxlen = IFQ_MAXLEN; 204u_long in_ifaddrhash; /* size of hash table - 1 */ 205int in_ifaddrentries; /* total number of addrs */ 206struct in_ifaddrhead in_ifaddr; 207struct in_ifaddrhashhead *in_ifaddrhashtbl; 208struct ifqueue ipintrq; 209struct ipstat ipstat; 210u_int16_t ip_id; 211 212#ifdef PFIL_HOOKS 213struct pfil_head inet_pfil_hook; 214#endif 215 216struct ipqhead ipq; 217int ipq_locked; 218int ip_nfragpackets = 0; 219int ip_maxfragpackets = 200; 220 221static __inline int ipq_lock_try __P((void)); 222static __inline void ipq_unlock __P((void)); 223 224static __inline int 225ipq_lock_try() 226{ 227 int s; 228 229 /* 230 * Use splvm() -- we're blocking things that would cause 231 * mbuf allocation. 232 */ 233 s = splvm(); 234 if (ipq_locked) { 235 splx(s); 236 return (0); 237 } 238 ipq_locked = 1; 239 splx(s); 240 return (1); 241} 242 243static __inline void 244ipq_unlock() 245{ 246 int s; 247 248 s = splvm(); 249 ipq_locked = 0; 250 splx(s); 251} 252 253#ifdef DIAGNOSTIC 254#define IPQ_LOCK() \ 255do { \ 256 if (ipq_lock_try() == 0) { \ 257 printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \ 258 panic("ipq_lock"); \ 259 } \ 260} while (0) 261#define IPQ_LOCK_CHECK() \ 262do { \ 263 if (ipq_locked == 0) { \ 264 printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \ 265 panic("ipq lock check"); \ 266 } \ 267} while (0) 268#else 269#define IPQ_LOCK() (void) ipq_lock_try() 270#define IPQ_LOCK_CHECK() /* nothing */ 271#endif 272 273#define IPQ_UNLOCK() ipq_unlock() 274 275struct pool ipqent_pool; 276 277#ifdef INET_CSUM_COUNTERS 278#include <sys/device.h> 279 280struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 281 NULL, "inet", "hwcsum bad"); 282struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 283 NULL, "inet", "hwcsum ok"); 284struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 285 NULL, "inet", "swcsum"); 286 287#define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 288 289#else 290 291#define INET_CSUM_COUNTER_INCR(ev) /* nothing */ 292 293#endif /* INET_CSUM_COUNTERS */ 294 295/* 296 * We need to save the IP options in case a protocol wants to respond 297 * to an incoming packet over the same route if the packet got here 298 * using IP source routing. This allows connection establishment and 299 * maintenance when the remote end is on a network that is not known 300 * to us. 301 */ 302int ip_nhops = 0; 303static struct ip_srcrt { 304 struct in_addr dst; /* final destination */ 305 char nop; /* one NOP to align */ 306 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 307 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 308} ip_srcrt; 309 310static void save_rte __P((u_char *, struct in_addr)); 311 312/* 313 * IP initialization: fill in IP protocol switch table. 314 * All protocols not implemented in kernel go to raw IP protocol handler. 315 */ 316void 317ip_init() 318{ 319 struct protosw *pr; 320 int i; 321 322 pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", 323 NULL); 324 325 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 326 if (pr == 0) 327 panic("ip_init"); 328 for (i = 0; i < IPPROTO_MAX; i++) 329 ip_protox[i] = pr - inetsw; 330 for (pr = inetdomain.dom_protosw; 331 pr < inetdomain.dom_protoswNPROTOSW; pr++) 332 if (pr->pr_domain->dom_family == PF_INET && 333 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 334 ip_protox[pr->pr_protocol] = pr - inetsw; 335 LIST_INIT(&ipq); 336 ip_id = time.tv_sec & 0xffff; 337 ipintrq.ifq_maxlen = ipqmaxlen; 338 TAILQ_INIT(&in_ifaddr); 339 in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR, 340 M_WAITOK, &in_ifaddrhash); 341 if (ip_mtudisc != 0) 342 ip_mtudisc_timeout_q = 343 rt_timer_queue_create(ip_mtudisc_timeout); 344#ifdef GATEWAY 345 ipflow_init(); 346#endif 347 348#ifdef PFIL_HOOKS 349 /* Register our Packet Filter hook. */ 350 inet_pfil_hook.ph_type = PFIL_TYPE_AF; 351 inet_pfil_hook.ph_af = AF_INET; 352 i = pfil_head_register(&inet_pfil_hook); 353 if (i != 0) 354 printf("ip_init: WARNING: unable to register pfil hook, " 355 "error %d\n", i); 356#endif /* PFIL_HOOKS */ 357 358#ifdef INET_CSUM_COUNTERS 359 evcnt_attach_static(&ip_hwcsum_bad); 360 evcnt_attach_static(&ip_hwcsum_ok); 361 evcnt_attach_static(&ip_swcsum); 362#endif /* INET_CSUM_COUNTERS */ 363} 364 365struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; 366struct route ipforward_rt; 367 368/* 369 * IP software interrupt routine 370 */ 371void 372ipintr() 373{ 374 int s; 375 struct mbuf *m; 376 377 while (1) { 378 s = splnet(); 379 IF_DEQUEUE(&ipintrq, m); 380 splx(s); 381 if (m == 0) 382 return; 383 ip_input(m); 384 } 385} 386 387/* 388 * Ip input routine. Checksum and byte swap header. If fragmented 389 * try to reassemble. Process options. Pass to next level. 390 */ 391void 392ip_input(struct mbuf *m) 393{ 394 struct ip *ip = NULL; 395 struct ipq *fp; 396 struct in_ifaddr *ia; 397 struct ifaddr *ifa; 398 struct ipqent *ipqe; 399 int hlen = 0, mff, len; 400 int downmatch; 401 402#ifdef DIAGNOSTIC 403 if ((m->m_flags & M_PKTHDR) == 0) 404 panic("ipintr no HDR"); 405#endif 406#ifdef IPSEC 407 /* 408 * should the inner packet be considered authentic? 409 * see comment in ah4_input(). 410 */ 411 if (m) { 412 m->m_flags &= ~M_AUTHIPHDR; 413 m->m_flags &= ~M_AUTHIPDGM; 414 } 415#endif 416 /* 417 * If no IP addresses have been set yet but the interfaces 418 * are receiving, can't do anything with incoming packets yet. 419 */ 420 if (TAILQ_FIRST(&in_ifaddr) == 0) 421 goto bad; 422 ipstat.ips_total++; 423 /* 424 * If the IP header is not aligned, slurp it up into a new 425 * mbuf with space for link headers, in the event we forward 426 * it. Otherwise, if it is aligned, make sure the entire 427 * base IP header is in the first mbuf of the chain. 428 */ 429 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 430 if ((m = m_copyup(m, sizeof(struct ip), 431 (max_linkhdr + 3) & ~3)) == NULL) { 432 /* XXXJRT new stat, please */ 433 ipstat.ips_toosmall++; 434 return; 435 } 436 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 437 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 438 ipstat.ips_toosmall++; 439 return; 440 } 441 } 442 ip = mtod(m, struct ip *); 443 if (ip->ip_v != IPVERSION) { 444 ipstat.ips_badvers++; 445 goto bad; 446 } 447 hlen = ip->ip_hl << 2; 448 if (hlen < sizeof(struct ip)) { /* minimum header length */ 449 ipstat.ips_badhlen++; 450 goto bad; 451 } 452 if (hlen > m->m_len) { 453 if ((m = m_pullup(m, hlen)) == 0) { 454 ipstat.ips_badhlen++; 455 return; 456 } 457 ip = mtod(m, struct ip *); 458 } 459 460 /* 461 * RFC1122: packets with a multicast source address are 462 * not allowed. 463 */ 464 if (IN_MULTICAST(ip->ip_src.s_addr)) { 465 ipstat.ips_badaddr++; 466 goto bad; 467 } 468 469 /* 127/8 must not appear on wire - RFC1122 */ 470 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 471 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 472 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 473 ipstat.ips_badaddr++; 474 goto bad; 475 } 476 } 477 478 switch (m->m_pkthdr.csum_flags & 479 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 480 M_CSUM_IPv4_BAD)) { 481 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 482 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 483 goto badcsum; 484 485 case M_CSUM_IPv4: 486 /* Checksum was okay. */ 487 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 488 break; 489 490 default: 491 /* Must compute it ourselves. */ 492 INET_CSUM_COUNTER_INCR(&ip_swcsum); 493 if (in_cksum(m, hlen) != 0) 494 goto bad; 495 break; 496 } 497 498 /* Retrieve the packet length. */ 499 len = ntohs(ip->ip_len); 500 501 /* 502 * Check for additional length bogosity 503 */ 504 if (len < hlen) { 505 ipstat.ips_badlen++; 506 goto bad; 507 } 508 509 /* 510 * Check that the amount of data in the buffers 511 * is as at least much as the IP header would have us expect. 512 * Trim mbufs if longer than we expect. 513 * Drop packet if shorter than we expect. 514 */ 515 if (m->m_pkthdr.len < len) { 516 ipstat.ips_tooshort++; 517 goto bad; 518 } 519 if (m->m_pkthdr.len > len) { 520 if (m->m_len == m->m_pkthdr.len) { 521 m->m_len = len; 522 m->m_pkthdr.len = len; 523 } else 524 m_adj(m, len - m->m_pkthdr.len); 525 } 526 527#ifdef IPSEC 528 /* ipflow (IP fast forwarding) is not compatible with IPsec. */ 529 m->m_flags &= ~M_CANFASTFWD; 530#else 531 /* 532 * Assume that we can create a fast-forward IP flow entry 533 * based on this packet. 534 */ 535 m->m_flags |= M_CANFASTFWD; 536#endif 537 538#ifdef PFIL_HOOKS 539 /* 540 * Run through list of hooks for input packets. If there are any 541 * filters which require that additional packets in the flow are 542 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 543 * Note that filters must _never_ set this flag, as another filter 544 * in the list may have previously cleared it. 545 */ 546 /* 547 * let ipfilter look at packet on the wire, 548 * not the decapsulated packet. 549 */ 550#ifdef IPSEC 551 if (!ipsec_getnhist(m)) 552#else 553 if (1) 554#endif 555 { 556 if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif, 557 PFIL_IN) != 0) 558 return; 559 if (m == NULL) 560 return; 561 ip = mtod(m, struct ip *); 562 hlen = ip->ip_hl << 2; 563 } 564#endif /* PFIL_HOOKS */ 565 566#ifdef ALTQ 567 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 568 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) { 569 /* packet dropped by traffic conditioner */ 570 return; 571 } 572#endif 573 574 /* 575 * Process options and, if not destined for us, 576 * ship it on. ip_dooptions returns 1 when an 577 * error was detected (causing an icmp message 578 * to be sent and the original packet to be freed). 579 */ 580 ip_nhops = 0; /* for source routed packets */ 581 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 582 return; 583 584 /* 585 * Check our list of addresses, to see if the packet is for us. 586 * 587 * Traditional 4.4BSD did not consult IFF_UP at all. 588 * The behavior here is to treat addresses on !IFF_UP interface 589 * as not mine. 590 */ 591 downmatch = 0; 592 LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 593 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 594 if ((ia->ia_ifp->if_flags & IFF_UP) != 0) 595 break; 596 else 597 downmatch++; 598 } 599 } 600 if (ia != NULL) 601 goto ours; 602 if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { 603 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) { 604 if (ifa->ifa_addr->sa_family != AF_INET) 605 continue; 606 ia = ifatoia(ifa); 607 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 608 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 609 /* 610 * Look for all-0's host part (old broadcast addr), 611 * either for subnet or net. 612 */ 613 ip->ip_dst.s_addr == ia->ia_subnet || 614 ip->ip_dst.s_addr == ia->ia_net) 615 goto ours; 616 /* 617 * An interface with IP address zero accepts 618 * all packets that arrive on that interface. 619 */ 620 if (in_nullhost(ia->ia_addr.sin_addr)) 621 goto ours; 622 } 623 } 624 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 625 struct in_multi *inm; 626#ifdef MROUTING 627 extern struct socket *ip_mrouter; 628 629 if (M_READONLY(m)) { 630 if ((m = m_pullup(m, hlen)) == 0) { 631 ipstat.ips_toosmall++; 632 return; 633 } 634 ip = mtod(m, struct ip *); 635 } 636 637 if (ip_mrouter) { 638 /* 639 * If we are acting as a multicast router, all 640 * incoming multicast packets are passed to the 641 * kernel-level multicast forwarding function. 642 * The packet is returned (relatively) intact; if 643 * ip_mforward() returns a non-zero value, the packet 644 * must be discarded, else it may be accepted below. 645 * 646 * (The IP ident field is put in the same byte order 647 * as expected when ip_mforward() is called from 648 * ip_output().) 649 */ 650 if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { 651 ipstat.ips_cantforward++; 652 m_freem(m); 653 return; 654 } 655 656 /* 657 * The process-level routing demon needs to receive 658 * all multicast IGMP packets, whether or not this 659 * host belongs to their destination groups. 660 */ 661 if (ip->ip_p == IPPROTO_IGMP) 662 goto ours; 663 ipstat.ips_forward++; 664 } 665#endif 666 /* 667 * See if we belong to the destination multicast group on the 668 * arrival interface. 669 */ 670 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 671 if (inm == NULL) { 672 ipstat.ips_cantforward++; 673 m_freem(m); 674 return; 675 } 676 goto ours; 677 } 678 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 679 in_nullhost(ip->ip_dst)) 680 goto ours; 681 682 /* 683 * Not for us; forward if possible and desirable. 684 */ 685 if (ipforwarding == 0) { 686 ipstat.ips_cantforward++; 687 m_freem(m); 688 } else { 689 /* 690 * If ip_dst matched any of my address on !IFF_UP interface, 691 * and there's no IFF_UP interface that matches ip_dst, 692 * send icmp unreach. Forwarding it will result in in-kernel 693 * forwarding loop till TTL goes to 0. 694 */ 695 if (downmatch) { 696 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 697 ipstat.ips_cantforward++; 698 return; 699 } 700#ifdef IPSEC 701 if (ipsec4_in_reject(m, NULL)) { 702 ipsecstat.in_polvio++; 703 goto bad; 704 } 705#endif 706 707 ip_forward(m, 0); 708 } 709 return; 710 711ours: 712 /* 713 * If offset or IP_MF are set, must reassemble. 714 * Otherwise, nothing need be done. 715 * (We could look in the reassembly queue to see 716 * if the packet was previously fragmented, 717 * but it's not worth the time; just let them time out.) 718 */ 719 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 720 if (M_READONLY(m)) { 721 if ((m = m_pullup(m, hlen)) == NULL) { 722 ipstat.ips_toosmall++; 723 goto bad; 724 } 725 ip = mtod(m, struct ip *); 726 } 727 728 /* 729 * Look for queue of fragments 730 * of this datagram. 731 */ 732 IPQ_LOCK(); 733 LIST_FOREACH(fp, &ipq, ipq_q) 734 if (ip->ip_id == fp->ipq_id && 735 in_hosteq(ip->ip_src, fp->ipq_src) && 736 in_hosteq(ip->ip_dst, fp->ipq_dst) && 737 ip->ip_p == fp->ipq_p) 738 goto found; 739 fp = 0; 740found: 741 742 /* 743 * Adjust ip_len to not reflect header, 744 * set ipqe_mff if more fragments are expected, 745 * convert offset of this to bytes. 746 */ 747 ip->ip_len = htons(ntohs(ip->ip_len) - hlen); 748 mff = (ip->ip_off & htons(IP_MF)) != 0; 749 if (mff) { 750 /* 751 * Make sure that fragments have a data length 752 * that's a non-zero multiple of 8 bytes. 753 */ 754 if (ntohs(ip->ip_len) == 0 || 755 (ntohs(ip->ip_len) & 0x7) != 0) { 756 ipstat.ips_badfrags++; 757 IPQ_UNLOCK(); 758 goto bad; 759 } 760 } 761 ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3); 762 763 /* 764 * If datagram marked as having more fragments 765 * or if this is not the first fragment, 766 * attempt reassembly; if it succeeds, proceed. 767 */ 768 if (mff || ip->ip_off != htons(0)) { 769 ipstat.ips_fragments++; 770 ipqe = pool_get(&ipqent_pool, PR_NOWAIT); 771 if (ipqe == NULL) { 772 ipstat.ips_rcvmemdrop++; 773 IPQ_UNLOCK(); 774 goto bad; 775 } 776 ipqe->ipqe_mff = mff; 777 ipqe->ipqe_m = m; 778 ipqe->ipqe_ip = ip; 779 m = ip_reass(ipqe, fp); 780 if (m == 0) { 781 IPQ_UNLOCK(); 782 return; 783 } 784 ipstat.ips_reassembled++; 785 ip = mtod(m, struct ip *); 786 hlen = ip->ip_hl << 2; 787 ip->ip_len = htons(ntohs(ip->ip_len) + hlen); 788 } else 789 if (fp) 790 ip_freef(fp); 791 IPQ_UNLOCK(); 792 } 793 794#ifdef IPSEC 795 /* 796 * enforce IPsec policy checking if we are seeing last header. 797 * note that we do not visit this with protocols with pcb layer 798 * code - like udp/tcp/raw ip. 799 */ 800 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 && 801 ipsec4_in_reject(m, NULL)) { 802 ipsecstat.in_polvio++; 803 goto bad; 804 } 805#endif 806 807 /* 808 * Switch out to protocol's input routine. 809 */ 810#if IFA_STATS 811 if (ia && ip) 812 ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 813#endif 814 ipstat.ips_delivered++; 815 { 816 int off = hlen, nh = ip->ip_p; 817 818 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 819 return; 820 } 821bad: 822 m_freem(m); 823 return; 824 825badcsum: 826 ipstat.ips_badsum++; 827 m_freem(m); 828} 829 830/* 831 * Take incoming datagram fragment and try to 832 * reassemble it into whole datagram. If a chain for 833 * reassembly of this datagram already exists, then it 834 * is given as fp; otherwise have to make a chain. 835 */ 836struct mbuf * 837ip_reass(ipqe, fp) 838 struct ipqent *ipqe; 839 struct ipq *fp; 840{ 841 struct mbuf *m = ipqe->ipqe_m; 842 struct ipqent *nq, *p, *q; 843 struct ip *ip; 844 struct mbuf *t; 845 int hlen = ipqe->ipqe_ip->ip_hl << 2; 846 int i, next; 847 848 IPQ_LOCK_CHECK(); 849 850 /* 851 * Presence of header sizes in mbufs 852 * would confuse code below. 853 */ 854 m->m_data += hlen; 855 m->m_len -= hlen; 856 857 /* 858 * If first fragment to arrive, create a reassembly queue. 859 */ 860 if (fp == 0) { 861 /* 862 * Enforce upper bound on number of fragmented packets 863 * for which we attempt reassembly; 864 * If maxfrag is 0, never accept fragments. 865 * If maxfrag is -1, accept all fragments without limitation. 866 */ 867 if (ip_maxfragpackets < 0) 868 ; 869 else if (ip_nfragpackets >= ip_maxfragpackets) 870 goto dropfrag; 871 ip_nfragpackets++; 872 MALLOC(fp, struct ipq *, sizeof (struct ipq), 873 M_FTABLE, M_NOWAIT); 874 if (fp == NULL) 875 goto dropfrag; 876 LIST_INSERT_HEAD(&ipq, fp, ipq_q); 877 fp->ipq_ttl = IPFRAGTTL; 878 fp->ipq_p = ipqe->ipqe_ip->ip_p; 879 fp->ipq_id = ipqe->ipqe_ip->ip_id; 880 TAILQ_INIT(&fp->ipq_fragq); 881 fp->ipq_src = ipqe->ipqe_ip->ip_src; 882 fp->ipq_dst = ipqe->ipqe_ip->ip_dst; 883 p = NULL; 884 goto insert; 885 } 886 887 /* 888 * Find a segment which begins after this one does. 889 */ 890 for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; 891 p = q, q = TAILQ_NEXT(q, ipqe_q)) 892 if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off)) 893 break; 894 895 /* 896 * If there is a preceding segment, it may provide some of 897 * our data already. If so, drop the data from the incoming 898 * segment. If it provides all of our data, drop us. 899 */ 900 if (p != NULL) { 901 i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) - 902 ntohs(ipqe->ipqe_ip->ip_off); 903 if (i > 0) { 904 if (i >= ntohs(ipqe->ipqe_ip->ip_len)) 905 goto dropfrag; 906 m_adj(ipqe->ipqe_m, i); 907 ipqe->ipqe_ip->ip_off = 908 htons(ntohs(ipqe->ipqe_ip->ip_off) + i); 909 ipqe->ipqe_ip->ip_len = 910 htons(ntohs(ipqe->ipqe_ip->ip_len) - i); 911 } 912 } 913 914 /* 915 * While we overlap succeeding segments trim them or, 916 * if they are completely covered, dequeue them. 917 */ 918 for (; q != NULL && 919 ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) > 920 ntohs(q->ipqe_ip->ip_off); q = nq) { 921 i = (ntohs(ipqe->ipqe_ip->ip_off) + 922 ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off); 923 if (i < ntohs(q->ipqe_ip->ip_len)) { 924 q->ipqe_ip->ip_len = 925 htons(ntohs(q->ipqe_ip->ip_len) - i); 926 q->ipqe_ip->ip_off = 927 htons(ntohs(q->ipqe_ip->ip_off) + i); 928 m_adj(q->ipqe_m, i); 929 break; 930 } 931 nq = TAILQ_NEXT(q, ipqe_q); 932 m_freem(q->ipqe_m); 933 TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q); 934 pool_put(&ipqent_pool, q); 935 } 936 937insert: 938 /* 939 * Stick new segment in its place; 940 * check for complete reassembly. 941 */ 942 if (p == NULL) { 943 TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q); 944 } else { 945 TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q); 946 } 947 next = 0; 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) != next) 951 return (0); 952 next += ntohs(q->ipqe_ip->ip_len); 953 } 954 if (p->ipqe_mff) 955 return (0); 956 957 /* 958 * Reassembly is complete. Check for a bogus message size and 959 * concatenate fragments. 960 */ 961 q = TAILQ_FIRST(&fp->ipq_fragq); 962 ip = q->ipqe_ip; 963 if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) { 964 ipstat.ips_toolong++; 965 ip_freef(fp); 966 return (0); 967 } 968 m = q->ipqe_m; 969 t = m->m_next; 970 m->m_next = 0; 971 m_cat(m, t); 972 nq = TAILQ_NEXT(q, ipqe_q); 973 pool_put(&ipqent_pool, q); 974 for (q = nq; q != NULL; q = nq) { 975 t = q->ipqe_m; 976 nq = TAILQ_NEXT(q, ipqe_q); 977 pool_put(&ipqent_pool, q); 978 m_cat(m, t); 979 } 980 981 /* 982 * Create header for new ip packet by 983 * modifying header of first packet; 984 * dequeue and discard fragment reassembly header. 985 * Make header visible. 986 */ 987 ip->ip_len = htons(next); 988 ip->ip_src = fp->ipq_src; 989 ip->ip_dst = fp->ipq_dst; 990 LIST_REMOVE(fp, ipq_q); 991 FREE(fp, M_FTABLE); 992 ip_nfragpackets--; 993 m->m_len += (ip->ip_hl << 2); 994 m->m_data -= (ip->ip_hl << 2); 995 /* some debugging cruft by sklower, below, will go away soon */ 996 if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */ 997 int plen = 0; 998 for (t = m; t; t = t->m_next) 999 plen += t->m_len; 1000 m->m_pkthdr.len = plen; 1001 } 1002 return (m); 1003 1004dropfrag: 1005 ipstat.ips_fragdropped++; 1006 m_freem(m); 1007 pool_put(&ipqent_pool, ipqe); 1008 return (0); 1009} 1010 1011/* 1012 * Free a fragment reassembly header and all 1013 * associated datagrams. 1014 */ 1015void 1016ip_freef(fp) 1017 struct ipq *fp; 1018{ 1019 struct ipqent *q, *p; 1020 1021 IPQ_LOCK_CHECK(); 1022 1023 for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) { 1024 p = TAILQ_NEXT(q, ipqe_q); 1025 m_freem(q->ipqe_m); 1026 TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q); 1027 pool_put(&ipqent_pool, q); 1028 } 1029 LIST_REMOVE(fp, ipq_q); 1030 FREE(fp, M_FTABLE); 1031 ip_nfragpackets--; 1032} 1033 1034/* 1035 * IP timer processing; 1036 * if a timer expires on a reassembly 1037 * queue, discard it. 1038 */ 1039void 1040ip_slowtimo() 1041{ 1042 struct ipq *fp, *nfp; 1043 int s = splsoftnet(); 1044 1045 IPQ_LOCK(); 1046 for (fp = LIST_FIRST(&ipq); fp != NULL; fp = nfp) { 1047 nfp = LIST_NEXT(fp, ipq_q); 1048 if (--fp->ipq_ttl == 0) { 1049 ipstat.ips_fragtimeout++; 1050 ip_freef(fp); 1051 } 1052 } 1053 /* 1054 * If we are over the maximum number of fragments 1055 * (due to the limit being lowered), drain off 1056 * enough to get down to the new limit. 1057 */ 1058 if (ip_maxfragpackets < 0) 1059 ; 1060 else { 1061 while (ip_nfragpackets > ip_maxfragpackets && LIST_FIRST(&ipq)) 1062 ip_freef(LIST_FIRST(&ipq)); 1063 } 1064 IPQ_UNLOCK(); 1065#ifdef GATEWAY 1066 ipflow_slowtimo(); 1067#endif 1068 splx(s); 1069} 1070 1071/* 1072 * Drain off all datagram fragments. 1073 */ 1074void 1075ip_drain() 1076{ 1077 1078 /* 1079 * We may be called from a device's interrupt context. If 1080 * the ipq is already busy, just bail out now. 1081 */ 1082 if (ipq_lock_try() == 0) 1083 return; 1084 1085 while (LIST_FIRST(&ipq) != NULL) { 1086 ipstat.ips_fragdropped++; 1087 ip_freef(LIST_FIRST(&ipq)); 1088 } 1089 1090 IPQ_UNLOCK(); 1091} 1092 1093/* 1094 * Do option processing on a datagram, 1095 * possibly discarding it if bad options are encountered, 1096 * or forwarding it if source-routed. 1097 * Returns 1 if packet has been forwarded/freed, 1098 * 0 if the packet should be processed further. 1099 */ 1100int 1101ip_dooptions(m) 1102 struct mbuf *m; 1103{ 1104 struct ip *ip = mtod(m, struct ip *); 1105 u_char *cp, *cp0; 1106 struct ip_timestamp *ipt; 1107 struct in_ifaddr *ia; 1108 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 1109 struct in_addr dst; 1110 n_time ntime; 1111 1112 dst = ip->ip_dst; 1113 cp = (u_char *)(ip + 1); 1114 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 1115 for (; cnt > 0; cnt -= optlen, cp += optlen) { 1116 opt = cp[IPOPT_OPTVAL]; 1117 if (opt == IPOPT_EOL) 1118 break; 1119 if (opt == IPOPT_NOP) 1120 optlen = 1; 1121 else { 1122 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 1123 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1124 goto bad; 1125 } 1126 optlen = cp[IPOPT_OLEN]; 1127 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 1128 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1129 goto bad; 1130 } 1131 } 1132 switch (opt) { 1133 1134 default: 1135 break; 1136 1137 /* 1138 * Source routing with record. 1139 * Find interface with current destination address. 1140 * If none on this machine then drop if strictly routed, 1141 * or do nothing if loosely routed. 1142 * Record interface address and bring up next address 1143 * component. If strictly routed make sure next 1144 * address is on directly accessible net. 1145 */ 1146 case IPOPT_LSRR: 1147 case IPOPT_SSRR: 1148 if (ip_allowsrcrt == 0) { 1149 type = ICMP_UNREACH; 1150 code = ICMP_UNREACH_NET_PROHIB; 1151 goto bad; 1152 } 1153 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1154 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1155 goto bad; 1156 } 1157 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1158 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1159 goto bad; 1160 } 1161 ipaddr.sin_addr = ip->ip_dst; 1162 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 1163 if (ia == 0) { 1164 if (opt == IPOPT_SSRR) { 1165 type = ICMP_UNREACH; 1166 code = ICMP_UNREACH_SRCFAIL; 1167 goto bad; 1168 } 1169 /* 1170 * Loose routing, and not at next destination 1171 * yet; nothing to do except forward. 1172 */ 1173 break; 1174 } 1175 off--; /* 0 origin */ 1176 if ((off + sizeof(struct in_addr)) > optlen) { 1177 /* 1178 * End of source route. Should be for us. 1179 */ 1180 save_rte(cp, ip->ip_src); 1181 break; 1182 } 1183 /* 1184 * locate outgoing interface 1185 */ 1186 bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr, 1187 sizeof(ipaddr.sin_addr)); 1188 if (opt == IPOPT_SSRR) 1189 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 1190 else 1191 ia = ip_rtaddr(ipaddr.sin_addr); 1192 if (ia == 0) { 1193 type = ICMP_UNREACH; 1194 code = ICMP_UNREACH_SRCFAIL; 1195 goto bad; 1196 } 1197 ip->ip_dst = ipaddr.sin_addr; 1198 bcopy((caddr_t)&ia->ia_addr.sin_addr, 1199 (caddr_t)(cp + off), sizeof(struct in_addr)); 1200 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1201 /* 1202 * Let ip_intr's mcast routing check handle mcast pkts 1203 */ 1204 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 1205 break; 1206 1207 case IPOPT_RR: 1208 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1209 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1210 goto bad; 1211 } 1212 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1213 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1214 goto bad; 1215 } 1216 /* 1217 * If no space remains, ignore. 1218 */ 1219 off--; /* 0 origin */ 1220 if ((off + sizeof(struct in_addr)) > optlen) 1221 break; 1222 bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr, 1223 sizeof(ipaddr.sin_addr)); 1224 /* 1225 * locate outgoing interface; if we're the destination, 1226 * use the incoming interface (should be same). 1227 */ 1228 if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))) 1229 == NULL && 1230 (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) { 1231 type = ICMP_UNREACH; 1232 code = ICMP_UNREACH_HOST; 1233 goto bad; 1234 } 1235 bcopy((caddr_t)&ia->ia_addr.sin_addr, 1236 (caddr_t)(cp + off), sizeof(struct in_addr)); 1237 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1238 break; 1239 1240 case IPOPT_TS: 1241 code = cp - (u_char *)ip; 1242 ipt = (struct ip_timestamp *)cp; 1243 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1244 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1245 goto bad; 1246 } 1247 if (ipt->ipt_ptr < 5) { 1248 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1249 goto bad; 1250 } 1251 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 1252 if (++ipt->ipt_oflw == 0) { 1253 code = (u_char *)&ipt->ipt_ptr - 1254 (u_char *)ip; 1255 goto bad; 1256 } 1257 break; 1258 } 1259 cp0 = (cp + ipt->ipt_ptr - 1); 1260 switch (ipt->ipt_flg) { 1261 1262 case IPOPT_TS_TSONLY: 1263 break; 1264 1265 case IPOPT_TS_TSANDADDR: 1266 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1267 sizeof(struct in_addr) > ipt->ipt_len) { 1268 code = (u_char *)&ipt->ipt_ptr - 1269 (u_char *)ip; 1270 goto bad; 1271 } 1272 ipaddr.sin_addr = dst; 1273 ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr), 1274 m->m_pkthdr.rcvif)); 1275 if (ia == 0) 1276 continue; 1277 bcopy(&ia->ia_addr.sin_addr, 1278 cp0, sizeof(struct in_addr)); 1279 ipt->ipt_ptr += sizeof(struct in_addr); 1280 break; 1281 1282 case IPOPT_TS_PRESPEC: 1283 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1284 sizeof(struct in_addr) > ipt->ipt_len) { 1285 code = (u_char *)&ipt->ipt_ptr - 1286 (u_char *)ip; 1287 goto bad; 1288 } 1289 bcopy(cp0, &ipaddr.sin_addr, 1290 sizeof(struct in_addr)); 1291 if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))) 1292 == NULL) 1293 continue; 1294 ipt->ipt_ptr += sizeof(struct in_addr); 1295 break; 1296 1297 default: 1298 /* XXX can't take &ipt->ipt_flg */ 1299 code = (u_char *)&ipt->ipt_ptr - 1300 (u_char *)ip + 1; 1301 goto bad; 1302 } 1303 ntime = iptime(); 1304 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1305 bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1, 1306 sizeof(n_time)); 1307 ipt->ipt_ptr += sizeof(n_time); 1308 } 1309 } 1310 if (forward) { 1311 if (ip_forwsrcrt == 0) { 1312 type = ICMP_UNREACH; 1313 code = ICMP_UNREACH_SRCFAIL; 1314 goto bad; 1315 } 1316 ip_forward(m, 1); 1317 return (1); 1318 } 1319 return (0); 1320bad: 1321 icmp_error(m, type, code, 0, 0); 1322 ipstat.ips_badoptions++; 1323 return (1); 1324} 1325 1326/* 1327 * Given address of next destination (final or next hop), 1328 * return internet address info of interface to be used to get there. 1329 */ 1330struct in_ifaddr * 1331ip_rtaddr(dst) 1332 struct in_addr dst; 1333{ 1334 struct sockaddr_in *sin; 1335 1336 sin = satosin(&ipforward_rt.ro_dst); 1337 1338 if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) { 1339 if (ipforward_rt.ro_rt) { 1340 RTFREE(ipforward_rt.ro_rt); 1341 ipforward_rt.ro_rt = 0; 1342 } 1343 sin->sin_family = AF_INET; 1344 sin->sin_len = sizeof(*sin); 1345 sin->sin_addr = dst; 1346 1347 rtalloc(&ipforward_rt); 1348 } 1349 if (ipforward_rt.ro_rt == 0) 1350 return ((struct in_ifaddr *)0); 1351 return (ifatoia(ipforward_rt.ro_rt->rt_ifa)); 1352} 1353 1354/* 1355 * Save incoming source route for use in replies, 1356 * to be picked up later by ip_srcroute if the receiver is interested. 1357 */ 1358void 1359save_rte(option, dst) 1360 u_char *option; 1361 struct in_addr dst; 1362{ 1363 unsigned olen; 1364 1365 olen = option[IPOPT_OLEN]; 1366#ifdef DIAGNOSTIC 1367 if (ipprintfs) 1368 printf("save_rte: olen %d\n", olen); 1369#endif /* 0 */ 1370 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1371 return; 1372 bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen); 1373 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1374 ip_srcrt.dst = dst; 1375} 1376 1377/* 1378 * Retrieve incoming source route for use in replies, 1379 * in the same form used by setsockopt. 1380 * The first hop is placed before the options, will be removed later. 1381 */ 1382struct mbuf * 1383ip_srcroute() 1384{ 1385 struct in_addr *p, *q; 1386 struct mbuf *m; 1387 1388 if (ip_nhops == 0) 1389 return ((struct mbuf *)0); 1390 m = m_get(M_DONTWAIT, MT_SOOPTS); 1391 if (m == 0) 1392 return ((struct mbuf *)0); 1393 1394#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1395 1396 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1397 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1398 OPTSIZ; 1399#ifdef DIAGNOSTIC 1400 if (ipprintfs) 1401 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1402#endif 1403 1404 /* 1405 * First save first hop for return route 1406 */ 1407 p = &ip_srcrt.route[ip_nhops - 1]; 1408 *(mtod(m, struct in_addr *)) = *p--; 1409#ifdef DIAGNOSTIC 1410 if (ipprintfs) 1411 printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr)); 1412#endif 1413 1414 /* 1415 * Copy option fields and padding (nop) to mbuf. 1416 */ 1417 ip_srcrt.nop = IPOPT_NOP; 1418 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1419 bcopy((caddr_t)&ip_srcrt.nop, 1420 mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ); 1421 q = (struct in_addr *)(mtod(m, caddr_t) + 1422 sizeof(struct in_addr) + OPTSIZ); 1423#undef OPTSIZ 1424 /* 1425 * Record return path as an IP source route, 1426 * reversing the path (pointers are now aligned). 1427 */ 1428 while (p >= ip_srcrt.route) { 1429#ifdef DIAGNOSTIC 1430 if (ipprintfs) 1431 printf(" %x", ntohl(q->s_addr)); 1432#endif 1433 *q++ = *p--; 1434 } 1435 /* 1436 * Last hop goes to final destination. 1437 */ 1438 *q = ip_srcrt.dst; 1439#ifdef DIAGNOSTIC 1440 if (ipprintfs) 1441 printf(" %x\n", ntohl(q->s_addr)); 1442#endif 1443 return (m); 1444} 1445 1446/* 1447 * Strip out IP options, at higher 1448 * level protocol in the kernel. 1449 * Second argument is buffer to which options 1450 * will be moved, and return value is their length. 1451 * XXX should be deleted; last arg currently ignored. 1452 */ 1453void 1454ip_stripoptions(m, mopt) 1455 struct mbuf *m; 1456 struct mbuf *mopt; 1457{ 1458 int i; 1459 struct ip *ip = mtod(m, struct ip *); 1460 caddr_t opts; 1461 int olen; 1462 1463 olen = (ip->ip_hl << 2) - sizeof (struct ip); 1464 opts = (caddr_t)(ip + 1); 1465 i = m->m_len - (sizeof (struct ip) + olen); 1466 bcopy(opts + olen, opts, (unsigned)i); 1467 m->m_len -= olen; 1468 if (m->m_flags & M_PKTHDR) 1469 m->m_pkthdr.len -= olen; 1470 ip->ip_len = htons(ntohs(ip->ip_len) - olen); 1471 ip->ip_hl = sizeof (struct ip) >> 2; 1472} 1473 1474const int inetctlerrmap[PRC_NCMDS] = { 1475 0, 0, 0, 0, 1476 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1477 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1478 EMSGSIZE, EHOSTUNREACH, 0, 0, 1479 0, 0, 0, 0, 1480 ENOPROTOOPT 1481}; 1482 1483/* 1484 * Forward a packet. If some error occurs return the sender 1485 * an icmp packet. Note we can't always generate a meaningful 1486 * icmp message because icmp doesn't have a large enough repertoire 1487 * of codes and types. 1488 * 1489 * If not forwarding, just drop the packet. This could be confusing 1490 * if ipforwarding was zero but some routing protocol was advancing 1491 * us as a gateway to somewhere. However, we must let the routing 1492 * protocol deal with that. 1493 * 1494 * The srcrt parameter indicates whether the packet is being forwarded 1495 * via a source route. 1496 */ 1497void 1498ip_forward(m, srcrt) 1499 struct mbuf *m; 1500 int srcrt; 1501{ 1502 struct ip *ip = mtod(m, struct ip *); 1503 struct sockaddr_in *sin; 1504 struct rtentry *rt; 1505 int error, type = 0, code = 0; 1506 struct mbuf *mcopy; 1507 n_long dest; 1508 struct ifnet *destifp; 1509#ifdef IPSEC 1510 struct ifnet dummyifp; 1511#endif 1512 1513 /* 1514 * Clear any in-bound checksum flags for this packet. 1515 */ 1516 m->m_pkthdr.csum_flags = 0; 1517 1518 dest = 0; 1519#ifdef DIAGNOSTIC 1520 if (ipprintfs) 1521 printf("forward: src %2.2x dst %2.2x ttl %x\n", 1522 ntohl(ip->ip_src.s_addr), 1523 ntohl(ip->ip_dst.s_addr), ip->ip_ttl); 1524#endif 1525 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1526 ipstat.ips_cantforward++; 1527 m_freem(m); 1528 return; 1529 } 1530 if (ip->ip_ttl <= IPTTLDEC) { 1531 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1532 return; 1533 } 1534 ip->ip_ttl -= IPTTLDEC; 1535 1536 sin = satosin(&ipforward_rt.ro_dst); 1537 if ((rt = ipforward_rt.ro_rt) == 0 || 1538 !in_hosteq(ip->ip_dst, sin->sin_addr)) { 1539 if (ipforward_rt.ro_rt) { 1540 RTFREE(ipforward_rt.ro_rt); 1541 ipforward_rt.ro_rt = 0; 1542 } 1543 sin->sin_family = AF_INET; 1544 sin->sin_len = sizeof(struct sockaddr_in); 1545 sin->sin_addr = ip->ip_dst; 1546 1547 rtalloc(&ipforward_rt); 1548 if (ipforward_rt.ro_rt == 0) { 1549 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0); 1550 return; 1551 } 1552 rt = ipforward_rt.ro_rt; 1553 } 1554 1555 /* 1556 * Save at most 68 bytes of the packet in case 1557 * we need to generate an ICMP message to the src. 1558 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1559 */ 1560 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1561 if (mcopy) 1562 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1563 1564 /* 1565 * If forwarding packet using same interface that it came in on, 1566 * perhaps should send a redirect to sender to shortcut a hop. 1567 * Only send redirect if source is sending directly to us, 1568 * and if packet was not source routed (or has any options). 1569 * Also, don't send redirect if forwarding using a default route 1570 * or a route modified by a redirect. 1571 */ 1572 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1573 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1574 !in_nullhost(satosin(rt_key(rt))->sin_addr) && 1575 ipsendredirects && !srcrt) { 1576 if (rt->rt_ifa && 1577 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1578 ifatoia(rt->rt_ifa)->ia_subnet) { 1579 if (rt->rt_flags & RTF_GATEWAY) 1580 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1581 else 1582 dest = ip->ip_dst.s_addr; 1583 /* 1584 * Router requirements says to only send host 1585 * redirects. 1586 */ 1587 type = ICMP_REDIRECT; 1588 code = ICMP_REDIRECT_HOST; 1589#ifdef DIAGNOSTIC 1590 if (ipprintfs) 1591 printf("redirect (%d) to %x\n", code, 1592 (u_int32_t)dest); 1593#endif 1594 } 1595 } 1596 1597#ifdef IPSEC 1598 /* Don't lookup socket in forwarding case */ 1599 (void)ipsec_setsocket(m, NULL); 1600#endif 1601 error = ip_output(m, (struct mbuf *)0, &ipforward_rt, 1602 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0); 1603 if (error) 1604 ipstat.ips_cantforward++; 1605 else { 1606 ipstat.ips_forward++; 1607 if (type) 1608 ipstat.ips_redirectsent++; 1609 else { 1610 if (mcopy) { 1611#ifdef GATEWAY 1612 if (mcopy->m_flags & M_CANFASTFWD) 1613 ipflow_create(&ipforward_rt, mcopy); 1614#endif 1615 m_freem(mcopy); 1616 } 1617 return; 1618 } 1619 } 1620 if (mcopy == NULL) 1621 return; 1622 destifp = NULL; 1623 1624 switch (error) { 1625 1626 case 0: /* forwarded, but need redirect */ 1627 /* type, code set above */ 1628 break; 1629 1630 case ENETUNREACH: /* shouldn't happen, checked above */ 1631 case EHOSTUNREACH: 1632 case ENETDOWN: 1633 case EHOSTDOWN: 1634 default: 1635 type = ICMP_UNREACH; 1636 code = ICMP_UNREACH_HOST; 1637 break; 1638 1639 case EMSGSIZE: 1640 type = ICMP_UNREACH; 1641 code = ICMP_UNREACH_NEEDFRAG; 1642#ifndef IPSEC 1643 if (ipforward_rt.ro_rt) 1644 destifp = ipforward_rt.ro_rt->rt_ifp; 1645#else 1646 /* 1647 * If the packet is routed over IPsec tunnel, tell the 1648 * originator the tunnel MTU. 1649 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 1650 * XXX quickhack!!! 1651 */ 1652 if (ipforward_rt.ro_rt) { 1653 struct secpolicy *sp; 1654 int ipsecerror; 1655 size_t ipsechdr; 1656 struct route *ro; 1657 1658 sp = ipsec4_getpolicybyaddr(mcopy, 1659 IPSEC_DIR_OUTBOUND, 1660 IP_FORWARDING, 1661 &ipsecerror); 1662 1663 if (sp == NULL) 1664 destifp = ipforward_rt.ro_rt->rt_ifp; 1665 else { 1666 /* count IPsec header size */ 1667 ipsechdr = ipsec4_hdrsiz(mcopy, 1668 IPSEC_DIR_OUTBOUND, 1669 NULL); 1670 1671 /* 1672 * find the correct route for outer IPv4 1673 * header, compute tunnel MTU. 1674 * 1675 * XXX BUG ALERT 1676 * The "dummyifp" code relies upon the fact 1677 * that icmp_error() touches only ifp->if_mtu. 1678 */ 1679 /*XXX*/ 1680 destifp = NULL; 1681 if (sp->req != NULL 1682 && sp->req->sav != NULL 1683 && sp->req->sav->sah != NULL) { 1684 ro = &sp->req->sav->sah->sa_route; 1685 if (ro->ro_rt && ro->ro_rt->rt_ifp) { 1686 dummyifp.if_mtu = 1687 ro->ro_rt->rt_rmx.rmx_mtu ? 1688 ro->ro_rt->rt_rmx.rmx_mtu : 1689 ro->ro_rt->rt_ifp->if_mtu; 1690 dummyifp.if_mtu -= ipsechdr; 1691 destifp = &dummyifp; 1692 } 1693 } 1694 1695 key_freesp(sp); 1696 } 1697 } 1698#endif /*IPSEC*/ 1699 ipstat.ips_cantfrag++; 1700 break; 1701 1702 case ENOBUFS: 1703#if 1 1704 /* 1705 * a router should not generate ICMP_SOURCEQUENCH as 1706 * required in RFC1812 Requirements for IP Version 4 Routers. 1707 * source quench could be a big problem under DoS attacks, 1708 * or if the underlying interface is rate-limited. 1709 */ 1710 if (mcopy) 1711 m_freem(mcopy); 1712 return; 1713#else 1714 type = ICMP_SOURCEQUENCH; 1715 code = 0; 1716 break; 1717#endif 1718 } 1719 icmp_error(mcopy, type, code, dest, destifp); 1720} 1721 1722void 1723ip_savecontrol(inp, mp, ip, m) 1724 struct inpcb *inp; 1725 struct mbuf **mp; 1726 struct ip *ip; 1727 struct mbuf *m; 1728{ 1729 1730 if (inp->inp_socket->so_options & SO_TIMESTAMP) { 1731 struct timeval tv; 1732 1733 microtime(&tv); 1734 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1735 SCM_TIMESTAMP, SOL_SOCKET); 1736 if (*mp) 1737 mp = &(*mp)->m_next; 1738 } 1739 if (inp->inp_flags & INP_RECVDSTADDR) { 1740 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst, 1741 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1742 if (*mp) 1743 mp = &(*mp)->m_next; 1744 } 1745#ifdef notyet 1746 /* 1747 * XXX 1748 * Moving these out of udp_input() made them even more broken 1749 * than they already were. 1750 * - fenner@parc.xerox.com 1751 */ 1752 /* options were tossed already */ 1753 if (inp->inp_flags & INP_RECVOPTS) { 1754 *mp = sbcreatecontrol((caddr_t) opts_deleted_above, 1755 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1756 if (*mp) 1757 mp = &(*mp)->m_next; 1758 } 1759 /* ip_srcroute doesn't do what we want here, need to fix */ 1760 if (inp->inp_flags & INP_RECVRETOPTS) { 1761 *mp = sbcreatecontrol((caddr_t) ip_srcroute(), 1762 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1763 if (*mp) 1764 mp = &(*mp)->m_next; 1765 } 1766#endif 1767 if (inp->inp_flags & INP_RECVIF) { 1768 struct sockaddr_dl sdl; 1769 1770 sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]); 1771 sdl.sdl_family = AF_LINK; 1772 sdl.sdl_index = m->m_pkthdr.rcvif ? 1773 m->m_pkthdr.rcvif->if_index : 0; 1774 sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0; 1775 *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len, 1776 IP_RECVIF, IPPROTO_IP); 1777 if (*mp) 1778 mp = &(*mp)->m_next; 1779 } 1780} 1781 1782int 1783ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 1784 int *name; 1785 u_int namelen; 1786 void *oldp; 1787 size_t *oldlenp; 1788 void *newp; 1789 size_t newlen; 1790{ 1791 extern int subnetsarelocal, hostzeroisbroadcast; 1792 1793 int error, old; 1794 1795 /* All sysctl names at this level are terminal. */ 1796 if (namelen != 1) 1797 return (ENOTDIR); 1798 1799 switch (name[0]) { 1800 case IPCTL_FORWARDING: 1801 return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding)); 1802 case IPCTL_SENDREDIRECTS: 1803 return (sysctl_int(oldp, oldlenp, newp, newlen, 1804 &ipsendredirects)); 1805 case IPCTL_DEFTTL: 1806 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl)); 1807#ifdef notyet 1808 case IPCTL_DEFMTU: 1809 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu)); 1810#endif 1811 case IPCTL_FORWSRCRT: 1812 /* Don't allow this to change in a secure environment. */ 1813 if (securelevel > 0) 1814 return (sysctl_rdint(oldp, oldlenp, newp, 1815 ip_forwsrcrt)); 1816 else 1817 return (sysctl_int(oldp, oldlenp, newp, newlen, 1818 &ip_forwsrcrt)); 1819 case IPCTL_DIRECTEDBCAST: 1820 return (sysctl_int(oldp, oldlenp, newp, newlen, 1821 &ip_directedbcast)); 1822 case IPCTL_ALLOWSRCRT: 1823 return (sysctl_int(oldp, oldlenp, newp, newlen, 1824 &ip_allowsrcrt)); 1825 case IPCTL_SUBNETSARELOCAL: 1826 return (sysctl_int(oldp, oldlenp, newp, newlen, 1827 &subnetsarelocal)); 1828 case IPCTL_MTUDISC: 1829 error = sysctl_int(oldp, oldlenp, newp, newlen, 1830 &ip_mtudisc); 1831 if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) { 1832 ip_mtudisc_timeout_q = 1833 rt_timer_queue_create(ip_mtudisc_timeout); 1834 } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) { 1835 rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE); 1836 ip_mtudisc_timeout_q = NULL; 1837 } 1838 return error; 1839 case IPCTL_ANONPORTMIN: 1840 old = anonportmin; 1841 error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin); 1842 if (anonportmin >= anonportmax || anonportmin < 0 1843 || anonportmin > 65535 1844#ifndef IPNOPRIVPORTS 1845 || anonportmin < IPPORT_RESERVED 1846#endif 1847 ) { 1848 anonportmin = old; 1849 return (EINVAL); 1850 } 1851 return (error); 1852 case IPCTL_ANONPORTMAX: 1853 old = anonportmax; 1854 error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax); 1855 if (anonportmin >= anonportmax || anonportmax < 0 1856 || anonportmax > 65535 1857#ifndef IPNOPRIVPORTS 1858 || anonportmax < IPPORT_RESERVED 1859#endif 1860 ) { 1861 anonportmax = old; 1862 return (EINVAL); 1863 } 1864 return (error); 1865 case IPCTL_MTUDISCTIMEOUT: 1866 error = sysctl_int(oldp, oldlenp, newp, newlen, 1867 &ip_mtudisc_timeout); 1868 if (ip_mtudisc_timeout < 0) 1869 return (EINVAL); 1870 if (ip_mtudisc_timeout_q != NULL) 1871 rt_timer_queue_change(ip_mtudisc_timeout_q, 1872 ip_mtudisc_timeout); 1873 return (error); 1874#ifdef GATEWAY 1875 case IPCTL_MAXFLOWS: 1876 { 1877 int s; 1878 1879 error = sysctl_int(oldp, oldlenp, newp, newlen, 1880 &ip_maxflows); 1881 s = splsoftnet(); 1882 ipflow_reap(0); 1883 splx(s); 1884 return (error); 1885 } 1886#endif 1887 case IPCTL_HOSTZEROBROADCAST: 1888 return (sysctl_int(oldp, oldlenp, newp, newlen, 1889 &hostzeroisbroadcast)); 1890#if NGIF > 0 1891 case IPCTL_GIF_TTL: 1892 return (sysctl_int(oldp, oldlenp, newp, newlen, 1893 &ip_gif_ttl)); 1894#endif 1895 1896#if NGRE > 0 1897 case IPCTL_GRE_TTL: 1898 return (sysctl_int(oldp, oldlenp, newp, newlen, 1899 &ip_gre_ttl)); 1900#endif 1901 1902#ifndef IPNOPRIVPORTS 1903 case IPCTL_LOWPORTMIN: 1904 old = lowportmin; 1905 error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin); 1906 if (lowportmin >= lowportmax 1907 || lowportmin > IPPORT_RESERVEDMAX 1908 || lowportmin < IPPORT_RESERVEDMIN 1909 ) { 1910 lowportmin = old; 1911 return (EINVAL); 1912 } 1913 return (error); 1914 case IPCTL_LOWPORTMAX: 1915 old = lowportmax; 1916 error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax); 1917 if (lowportmin >= lowportmax 1918 || lowportmax > IPPORT_RESERVEDMAX 1919 || lowportmax < IPPORT_RESERVEDMIN 1920 ) { 1921 lowportmax = old; 1922 return (EINVAL); 1923 } 1924 return (error); 1925#endif 1926 1927 case IPCTL_MAXFRAGPACKETS: 1928 return (sysctl_int(oldp, oldlenp, newp, newlen, 1929 &ip_maxfragpackets)); 1930 1931 default: 1932 return (EOPNOTSUPP); 1933 } 1934 /* NOTREACHED */ 1935} 1936