1 /* $NetBSD: ip_input.c,v 1.288 2010/07/13 22:16:10 rmind Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 1998 The NetBSD Foundation, Inc. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to The NetBSD Foundation 37 * by Public Access Networks Corporation ("Panix"). It was developed under 38 * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 50 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 51 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 52 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 53 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 54 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 55 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 56 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 57 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 58 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 59 * POSSIBILITY OF SUCH DAMAGE. 60 */ 61 62 /* 63 * Copyright (c) 1982, 1986, 1988, 1993 64 * The Regents of the University of California. All rights reserved. 65 * 66 * Redistribution and use in source and binary forms, with or without 67 * modification, are permitted provided that the following conditions 68 * are met: 69 * 1. Redistributions of source code must retain the above copyright 70 * notice, this list of conditions and the following disclaimer. 71 * 2. Redistributions in binary form must reproduce the above copyright 72 * notice, this list of conditions and the following disclaimer in the 73 * documentation and/or other materials provided with the distribution. 74 * 3. Neither the name of the University nor the names of its contributors 75 * may be used to endorse or promote products derived from this software 76 * without specific prior written permission. 77 * 78 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 79 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 80 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 81 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 82 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 83 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 84 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 85 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 86 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 87 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 88 * SUCH DAMAGE. 89 * 90 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 91 */ 92 93 #include <sys/cdefs.h> 94 __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.288 2010/07/13 22:16:10 rmind Exp $"); 95 96 #include "opt_inet.h" 97 #include "opt_compat_netbsd.h" 98 #include "opt_gateway.h" 99 #include "opt_pfil_hooks.h" 100 #include "opt_ipsec.h" 101 #include "opt_mrouting.h" 102 #include "opt_mbuftrace.h" 103 #include "opt_inet_csum.h" 104 105 #include <sys/param.h> 106 #include <sys/systm.h> 107 #include <sys/mbuf.h> 108 #include <sys/domain.h> 109 #include <sys/protosw.h> 110 #include <sys/socket.h> 111 #include <sys/socketvar.h> 112 #include <sys/errno.h> 113 #include <sys/time.h> 114 #include <sys/kernel.h> 115 #include <sys/pool.h> 116 #include <sys/sysctl.h> 117 #include <sys/kauth.h> 118 119 #include <net/if.h> 120 #include <net/if_dl.h> 121 #include <net/route.h> 122 #include <net/pfil.h> 123 124 #include <netinet/in.h> 125 #include <netinet/in_systm.h> 126 #include <netinet/ip.h> 127 #include <netinet/in_pcb.h> 128 #include <netinet/in_proto.h> 129 #include <netinet/in_var.h> 130 #include <netinet/ip_var.h> 131 #include <netinet/ip_private.h> 132 #include <netinet/ip_icmp.h> 133 /* just for gif_ttl */ 134 #include <netinet/in_gif.h> 135 #include "gif.h" 136 #include <net/if_gre.h> 137 #include "gre.h" 138 139 #ifdef MROUTING 140 #include <netinet/ip_mroute.h> 141 #endif 142 143 #ifdef IPSEC 144 #include <netinet6/ipsec.h> 145 #include <netinet6/ipsec_private.h> 146 #include <netkey/key.h> 147 #endif 148 #ifdef FAST_IPSEC 149 #include <netipsec/ipsec.h> 150 #include <netipsec/key.h> 151 #endif /* FAST_IPSEC*/ 152 153 #ifndef IPFORWARDING 154 #ifdef GATEWAY 155 #define IPFORWARDING 1 /* forward IP packets not for us */ 156 #else /* GATEWAY */ 157 #define IPFORWARDING 0 /* don't forward IP packets not for us */ 158 #endif /* GATEWAY */ 159 #endif /* IPFORWARDING */ 160 #ifndef IPSENDREDIRECTS 161 #define IPSENDREDIRECTS 1 162 #endif 163 #ifndef IPFORWSRCRT 164 #define IPFORWSRCRT 1 /* forward source-routed packets */ 165 #endif 166 #ifndef IPALLOWSRCRT 167 #define IPALLOWSRCRT 1 /* allow source-routed packets */ 168 #endif 169 #ifndef IPMTUDISC 170 #define IPMTUDISC 1 171 #endif 172 #ifndef IPMTUDISCTIMEOUT 173 #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 174 #endif 175 176 #ifdef COMPAT_50 177 #include <compat/sys/time.h> 178 #include <compat/sys/socket.h> 179 #endif 180 181 /* 182 * Note: DIRECTED_BROADCAST is handled this way so that previous 183 * configuration using this option will Just Work. 184 */ 185 #ifndef IPDIRECTEDBCAST 186 #ifdef DIRECTED_BROADCAST 187 #define IPDIRECTEDBCAST 1 188 #else 189 #define IPDIRECTEDBCAST 0 190 #endif /* DIRECTED_BROADCAST */ 191 #endif /* IPDIRECTEDBCAST */ 192 int ipforwarding = IPFORWARDING; 193 int ipsendredirects = IPSENDREDIRECTS; 194 int ip_defttl = IPDEFTTL; 195 int ip_forwsrcrt = IPFORWSRCRT; 196 int ip_directedbcast = IPDIRECTEDBCAST; 197 int ip_allowsrcrt = IPALLOWSRCRT; 198 int ip_mtudisc = IPMTUDISC; 199 int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; 200 #ifdef DIAGNOSTIC 201 int ipprintfs = 0; 202 #endif 203 204 int ip_do_randomid = 0; 205 206 /* 207 * XXX - Setting ip_checkinterface mostly implements the receive side of 208 * the Strong ES model described in RFC 1122, but since the routing table 209 * and transmit implementation do not implement the Strong ES model, 210 * setting this to 1 results in an odd hybrid. 211 * 212 * XXX - ip_checkinterface currently must be disabled if you use ipnat 213 * to translate the destination address to another local interface. 214 * 215 * XXX - ip_checkinterface must be disabled if you add IP aliases 216 * to the loopback interface instead of the interface where the 217 * packets for those addresses are received. 218 */ 219 int ip_checkinterface = 0; 220 221 222 struct rttimer_queue *ip_mtudisc_timeout_q = NULL; 223 224 int ipqmaxlen = IFQ_MAXLEN; 225 u_long in_ifaddrhash; /* size of hash table - 1 */ 226 int in_ifaddrentries; /* total number of addrs */ 227 struct in_ifaddrhead in_ifaddrhead; 228 struct in_ifaddrhashhead *in_ifaddrhashtbl; 229 u_long in_multihash; /* size of hash table - 1 */ 230 int in_multientries; /* total number of addrs */ 231 struct in_multihashhead *in_multihashtbl; 232 struct ifqueue ipintrq; 233 234 uint16_t ip_id; 235 236 percpu_t *ipstat_percpu; 237 238 #ifdef PFIL_HOOKS 239 struct pfil_head inet_pfil_hook; 240 #endif 241 242 struct pool inmulti_pool; 243 244 #ifdef INET_CSUM_COUNTERS 245 #include <sys/device.h> 246 247 struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 248 NULL, "inet", "hwcsum bad"); 249 struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 250 NULL, "inet", "hwcsum ok"); 251 struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 252 NULL, "inet", "swcsum"); 253 254 #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 255 256 EVCNT_ATTACH_STATIC(ip_hwcsum_bad); 257 EVCNT_ATTACH_STATIC(ip_hwcsum_ok); 258 EVCNT_ATTACH_STATIC(ip_swcsum); 259 260 #else 261 262 #define INET_CSUM_COUNTER_INCR(ev) /* nothing */ 263 264 #endif /* INET_CSUM_COUNTERS */ 265 266 /* 267 * We need to save the IP options in case a protocol wants to respond 268 * to an incoming packet over the same route if the packet got here 269 * using IP source routing. This allows connection establishment and 270 * maintenance when the remote end is on a network that is not known 271 * to us. 272 */ 273 int ip_nhops = 0; 274 static struct ip_srcrt { 275 struct in_addr dst; /* final destination */ 276 char nop; /* one NOP to align */ 277 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 278 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 279 } ip_srcrt; 280 281 static void save_rte(u_char *, struct in_addr); 282 283 #ifdef MBUFTRACE 284 struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx"); 285 struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx"); 286 #endif 287 288 static void sysctl_net_inet_ip_setup(struct sysctllog **); 289 290 /* 291 * IP initialization: fill in IP protocol switch table. 292 * All protocols not implemented in kernel go to raw IP protocol handler. 293 */ 294 void 295 ip_init(void) 296 { 297 const struct protosw *pr; 298 int i; 299 300 sysctl_net_inet_ip_setup(NULL); 301 302 pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", 303 NULL, IPL_SOFTNET); 304 305 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 306 if (pr == 0) 307 panic("ip_init"); 308 for (i = 0; i < IPPROTO_MAX; i++) 309 ip_protox[i] = pr - inetsw; 310 for (pr = inetdomain.dom_protosw; 311 pr < inetdomain.dom_protoswNPROTOSW; pr++) 312 if (pr->pr_domain->dom_family == PF_INET && 313 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 314 ip_protox[pr->pr_protocol] = pr - inetsw; 315 316 ip_reass_init(); 317 318 ip_initid(); 319 ip_id = time_second & 0xfffff; 320 321 ipintrq.ifq_maxlen = ipqmaxlen; 322 323 TAILQ_INIT(&in_ifaddrhead); 324 in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 325 &in_ifaddrhash); 326 in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 327 &in_multihash); 328 ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); 329 #ifdef GATEWAY 330 ipflow_init(ip_hashsize); 331 #endif 332 333 #ifdef PFIL_HOOKS 334 /* Register our Packet Filter hook. */ 335 inet_pfil_hook.ph_type = PFIL_TYPE_AF; 336 inet_pfil_hook.ph_af = AF_INET; 337 i = pfil_head_register(&inet_pfil_hook); 338 if (i != 0) 339 printf("ip_init: WARNING: unable to register pfil hook, " 340 "error %d\n", i); 341 #endif /* PFIL_HOOKS */ 342 343 #ifdef MBUFTRACE 344 MOWNER_ATTACH(&ip_tx_mowner); 345 MOWNER_ATTACH(&ip_rx_mowner); 346 #endif /* MBUFTRACE */ 347 348 ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS); 349 } 350 351 struct sockaddr_in ipaddr = { 352 .sin_len = sizeof(ipaddr), 353 .sin_family = AF_INET, 354 }; 355 struct route ipforward_rt; 356 357 /* 358 * IP software interrupt routine 359 */ 360 void 361 ipintr(void) 362 { 363 int s; 364 struct mbuf *m; 365 struct ifqueue lcl_intrq; 366 367 memset(&lcl_intrq, 0, sizeof(lcl_intrq)); 368 ipintrq.ifq_maxlen = ipqmaxlen; 369 370 mutex_enter(softnet_lock); 371 KERNEL_LOCK(1, NULL); 372 if (!IF_IS_EMPTY(&ipintrq)) { 373 s = splnet(); 374 375 /* Take existing queue onto stack */ 376 lcl_intrq = ipintrq; 377 378 /* Zero out global queue, preserving maxlen and drops */ 379 ipintrq.ifq_head = NULL; 380 ipintrq.ifq_tail = NULL; 381 ipintrq.ifq_len = 0; 382 ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen; 383 ipintrq.ifq_drops = lcl_intrq.ifq_drops; 384 385 splx(s); 386 } 387 KERNEL_UNLOCK_ONE(NULL); 388 while (!IF_IS_EMPTY(&lcl_intrq)) { 389 IF_DEQUEUE(&lcl_intrq, m); 390 if (m == NULL) 391 break; 392 ip_input(m); 393 } 394 mutex_exit(softnet_lock); 395 } 396 397 /* 398 * Ip input routine. Checksum and byte swap header. If fragmented 399 * try to reassemble. Process options. Pass to next level. 400 */ 401 void 402 ip_input(struct mbuf *m) 403 { 404 struct ip *ip = NULL; 405 struct in_ifaddr *ia; 406 struct ifaddr *ifa; 407 int hlen = 0, len; 408 int downmatch; 409 int checkif; 410 int srcrt = 0; 411 #ifdef FAST_IPSEC 412 struct m_tag *mtag; 413 struct tdb_ident *tdbi; 414 struct secpolicy *sp; 415 int error; 416 #endif /* FAST_IPSEC */ 417 418 MCLAIM(m, &ip_rx_mowner); 419 #ifdef DIAGNOSTIC 420 if ((m->m_flags & M_PKTHDR) == 0) 421 panic("ipintr no HDR"); 422 #endif 423 424 /* 425 * If no IP addresses have been set yet but the interfaces 426 * are receiving, can't do anything with incoming packets yet. 427 */ 428 if (TAILQ_FIRST(&in_ifaddrhead) == 0) 429 goto bad; 430 IP_STATINC(IP_STAT_TOTAL); 431 /* 432 * If the IP header is not aligned, slurp it up into a new 433 * mbuf with space for link headers, in the event we forward 434 * it. Otherwise, if it is aligned, make sure the entire 435 * base IP header is in the first mbuf of the chain. 436 */ 437 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 438 if ((m = m_copyup(m, sizeof(struct ip), 439 (max_linkhdr + 3) & ~3)) == NULL) { 440 /* XXXJRT new stat, please */ 441 IP_STATINC(IP_STAT_TOOSMALL); 442 return; 443 } 444 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 445 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 446 IP_STATINC(IP_STAT_TOOSMALL); 447 return; 448 } 449 } 450 ip = mtod(m, struct ip *); 451 if (ip->ip_v != IPVERSION) { 452 IP_STATINC(IP_STAT_BADVERS); 453 goto bad; 454 } 455 hlen = ip->ip_hl << 2; 456 if (hlen < sizeof(struct ip)) { /* minimum header length */ 457 IP_STATINC(IP_STAT_BADHLEN); 458 goto bad; 459 } 460 if (hlen > m->m_len) { 461 if ((m = m_pullup(m, hlen)) == 0) { 462 IP_STATINC(IP_STAT_BADHLEN); 463 return; 464 } 465 ip = mtod(m, struct ip *); 466 } 467 468 /* 469 * RFC1122: packets with a multicast source address are 470 * not allowed. 471 */ 472 if (IN_MULTICAST(ip->ip_src.s_addr)) { 473 IP_STATINC(IP_STAT_BADADDR); 474 goto bad; 475 } 476 477 /* 127/8 must not appear on wire - RFC1122 */ 478 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 479 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 480 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 481 IP_STATINC(IP_STAT_BADADDR); 482 goto bad; 483 } 484 } 485 486 switch (m->m_pkthdr.csum_flags & 487 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 488 M_CSUM_IPv4_BAD)) { 489 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 490 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 491 goto badcsum; 492 493 case M_CSUM_IPv4: 494 /* Checksum was okay. */ 495 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 496 break; 497 498 default: 499 /* 500 * Must compute it ourselves. Maybe skip checksum on 501 * loopback interfaces. 502 */ 503 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 504 IFF_LOOPBACK) || ip_do_loopback_cksum)) { 505 INET_CSUM_COUNTER_INCR(&ip_swcsum); 506 if (in_cksum(m, hlen) != 0) 507 goto badcsum; 508 } 509 break; 510 } 511 512 /* Retrieve the packet length. */ 513 len = ntohs(ip->ip_len); 514 515 /* 516 * Check for additional length bogosity 517 */ 518 if (len < hlen) { 519 IP_STATINC(IP_STAT_BADLEN); 520 goto bad; 521 } 522 523 /* 524 * Check that the amount of data in the buffers 525 * is as at least much as the IP header would have us expect. 526 * Trim mbufs if longer than we expect. 527 * Drop packet if shorter than we expect. 528 */ 529 if (m->m_pkthdr.len < len) { 530 IP_STATINC(IP_STAT_TOOSHORT); 531 goto bad; 532 } 533 if (m->m_pkthdr.len > len) { 534 if (m->m_len == m->m_pkthdr.len) { 535 m->m_len = len; 536 m->m_pkthdr.len = len; 537 } else 538 m_adj(m, len - m->m_pkthdr.len); 539 } 540 541 #if defined(IPSEC) 542 /* ipflow (IP fast forwarding) is not compatible with IPsec. */ 543 m->m_flags &= ~M_CANFASTFWD; 544 #else 545 /* 546 * Assume that we can create a fast-forward IP flow entry 547 * based on this packet. 548 */ 549 m->m_flags |= M_CANFASTFWD; 550 #endif 551 552 #ifdef PFIL_HOOKS 553 /* 554 * Run through list of hooks for input packets. If there are any 555 * filters which require that additional packets in the flow are 556 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 557 * Note that filters must _never_ set this flag, as another filter 558 * in the list may have previously cleared it. 559 */ 560 /* 561 * let ipfilter look at packet on the wire, 562 * not the decapsulated packet. 563 */ 564 #ifdef IPSEC 565 if (!ipsec_getnhist(m)) 566 #elif defined(FAST_IPSEC) 567 if (!ipsec_indone(m)) 568 #else 569 if (1) 570 #endif 571 { 572 struct in_addr odst; 573 574 odst = ip->ip_dst; 575 if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif, 576 PFIL_IN) != 0) 577 return; 578 if (m == NULL) 579 return; 580 ip = mtod(m, struct ip *); 581 hlen = ip->ip_hl << 2; 582 /* 583 * XXX The setting of "srcrt" here is to prevent ip_forward() 584 * from generating ICMP redirects for packets that have 585 * been redirected by a hook back out on to the same LAN that 586 * they came from and is not an indication that the packet 587 * is being inffluenced by source routing options. This 588 * allows things like 589 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" 590 * where tlp0 is both on the 1.1.1.0/24 network and is the 591 * default route for hosts on 1.1.1.0/24. Of course this 592 * also requires a "map tlp0 ..." to complete the story. 593 * One might argue whether or not this kind of network config. 594 * should be supported in this manner... 595 */ 596 srcrt = (odst.s_addr != ip->ip_dst.s_addr); 597 } 598 #endif /* PFIL_HOOKS */ 599 600 #ifdef ALTQ 601 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 602 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) { 603 /* packet dropped by traffic conditioner */ 604 return; 605 } 606 #endif 607 608 /* 609 * Process options and, if not destined for us, 610 * ship it on. ip_dooptions returns 1 when an 611 * error was detected (causing an icmp message 612 * to be sent and the original packet to be freed). 613 */ 614 ip_nhops = 0; /* for source routed packets */ 615 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 616 return; 617 618 /* 619 * Enable a consistency check between the destination address 620 * and the arrival interface for a unicast packet (the RFC 1122 621 * strong ES model) if IP forwarding is disabled and the packet 622 * is not locally generated. 623 * 624 * XXX - Checking also should be disabled if the destination 625 * address is ipnat'ed to a different interface. 626 * 627 * XXX - Checking is incompatible with IP aliases added 628 * to the loopback interface instead of the interface where 629 * the packets are received. 630 * 631 * XXX - We need to add a per ifaddr flag for this so that 632 * we get finer grain control. 633 */ 634 checkif = ip_checkinterface && (ipforwarding == 0) && 635 (m->m_pkthdr.rcvif != NULL) && 636 ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0); 637 638 /* 639 * Check our list of addresses, to see if the packet is for us. 640 * 641 * Traditional 4.4BSD did not consult IFF_UP at all. 642 * The behavior here is to treat addresses on !IFF_UP interface 643 * as not mine. 644 */ 645 downmatch = 0; 646 LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 647 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 648 if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif) 649 continue; 650 if ((ia->ia_ifp->if_flags & IFF_UP) != 0) 651 break; 652 else 653 downmatch++; 654 } 655 } 656 if (ia != NULL) 657 goto ours; 658 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { 659 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 660 if (ifa->ifa_addr->sa_family != AF_INET) 661 continue; 662 ia = ifatoia(ifa); 663 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 664 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 665 /* 666 * Look for all-0's host part (old broadcast addr), 667 * either for subnet or net. 668 */ 669 ip->ip_dst.s_addr == ia->ia_subnet || 670 ip->ip_dst.s_addr == ia->ia_net) 671 goto ours; 672 /* 673 * An interface with IP address zero accepts 674 * all packets that arrive on that interface. 675 */ 676 if (in_nullhost(ia->ia_addr.sin_addr)) 677 goto ours; 678 } 679 } 680 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 681 struct in_multi *inm; 682 #ifdef MROUTING 683 extern struct socket *ip_mrouter; 684 685 if (ip_mrouter) { 686 /* 687 * If we are acting as a multicast router, all 688 * incoming multicast packets are passed to the 689 * kernel-level multicast forwarding function. 690 * The packet is returned (relatively) intact; if 691 * ip_mforward() returns a non-zero value, the packet 692 * must be discarded, else it may be accepted below. 693 * 694 * (The IP ident field is put in the same byte order 695 * as expected when ip_mforward() is called from 696 * ip_output().) 697 */ 698 if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { 699 IP_STATINC(IP_STAT_CANTFORWARD); 700 m_freem(m); 701 return; 702 } 703 704 /* 705 * The process-level routing demon needs to receive 706 * all multicast IGMP packets, whether or not this 707 * host belongs to their destination groups. 708 */ 709 if (ip->ip_p == IPPROTO_IGMP) 710 goto ours; 711 IP_STATINC(IP_STAT_CANTFORWARD); 712 } 713 #endif 714 /* 715 * See if we belong to the destination multicast group on the 716 * arrival interface. 717 */ 718 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 719 if (inm == NULL) { 720 IP_STATINC(IP_STAT_CANTFORWARD); 721 m_freem(m); 722 return; 723 } 724 goto ours; 725 } 726 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 727 in_nullhost(ip->ip_dst)) 728 goto ours; 729 730 /* 731 * Not for us; forward if possible and desirable. 732 */ 733 if (ipforwarding == 0) { 734 IP_STATINC(IP_STAT_CANTFORWARD); 735 m_freem(m); 736 } else { 737 /* 738 * If ip_dst matched any of my address on !IFF_UP interface, 739 * and there's no IFF_UP interface that matches ip_dst, 740 * send icmp unreach. Forwarding it will result in in-kernel 741 * forwarding loop till TTL goes to 0. 742 */ 743 if (downmatch) { 744 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 745 IP_STATINC(IP_STAT_CANTFORWARD); 746 return; 747 } 748 #ifdef IPSEC 749 if (ipsec4_in_reject(m, NULL)) { 750 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 751 goto bad; 752 } 753 #endif 754 #ifdef FAST_IPSEC 755 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 756 s = splsoftnet(); 757 if (mtag != NULL) { 758 tdbi = (struct tdb_ident *)(mtag + 1); 759 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 760 } else { 761 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 762 IP_FORWARDING, &error); 763 } 764 if (sp == NULL) { /* NB: can happen if error */ 765 splx(s); 766 /*XXX error stat???*/ 767 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/ 768 goto bad; 769 } 770 771 /* 772 * Check security policy against packet attributes. 773 */ 774 error = ipsec_in_reject(sp, m); 775 KEY_FREESP(&sp); 776 splx(s); 777 if (error) { 778 IP_STATINC(IP_STAT_CANTFORWARD); 779 goto bad; 780 } 781 782 /* 783 * Peek at the outbound SP for this packet to determine if 784 * it's a Fast Forward candidate. 785 */ 786 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 787 if (mtag != NULL) 788 m->m_flags &= ~M_CANFASTFWD; 789 else { 790 s = splsoftnet(); 791 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, 792 (IP_FORWARDING | 793 (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 794 &error, NULL); 795 if (sp != NULL) { 796 m->m_flags &= ~M_CANFASTFWD; 797 KEY_FREESP(&sp); 798 } 799 splx(s); 800 } 801 #endif /* FAST_IPSEC */ 802 803 ip_forward(m, srcrt); 804 } 805 return; 806 807 ours: 808 /* 809 * If offset or IP_MF are set, must reassemble. 810 */ 811 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 812 struct ipq *fp; 813 u_int off, hash; 814 bool mff; 815 816 /* 817 * Prevent TCP blind data attacks by not allowing non-initial 818 * fragments to start at less than 68 bytes (minimal fragment 819 * size) and making sure the first fragment is at least 68 820 * bytes. 821 */ 822 off = (ntohs(ip->ip_off) & IP_OFFMASK) << 3; 823 if ((off > 0 ? off + hlen : len) < IP_MINFRAGSIZE - 1) { 824 IP_STATINC(IP_STAT_BADFRAGS); 825 goto bad; 826 } 827 828 /* 829 * Adjust total IP length to not reflect header. Set 'mff' 830 * indicator, if more fragments are expected. Convert offset 831 * of this to bytes. 832 */ 833 ip->ip_len = htons(ntohs(ip->ip_len) - hlen); 834 mff = (ip->ip_off & htons(IP_MF)) != 0; 835 if (mff) { 836 /* 837 * Make sure that fragments have a data length 838 * which is non-zero and multiple of 8 bytes. 839 */ 840 if (ntohs(ip->ip_len) == 0 || 841 (ntohs(ip->ip_len) & 0x7) != 0) { 842 IP_STATINC(IP_STAT_BADFRAGS); 843 goto bad; 844 } 845 } 846 ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3); 847 848 /* Look for queue of fragments of this datagram. */ 849 fp = ip_reass_lookup(ip, &hash); 850 851 /* Make sure the TOS matches previous fragments. */ 852 if (fp && fp->ipq_tos != ip->ip_tos) { 853 IP_STATINC(IP_STAT_BADFRAGS); 854 ip_reass_unlock(); 855 goto bad; 856 } 857 858 /* 859 * If datagram marked as having more fragments 860 * or if this is not the first fragment, 861 * attempt reassembly; if it succeeds, proceed. 862 */ 863 if (mff || ip->ip_off != htons(0)) { 864 struct ipqent *ipqe; 865 866 ipqe = ip_reass_getent(); 867 if (ipqe == NULL) { 868 IP_STATINC(IP_STAT_RCVMEMDROP); 869 ip_reass_unlock(); 870 goto bad; 871 } 872 ipqe->ipqe_mff = mff; 873 ipqe->ipqe_m = m; 874 ipqe->ipqe_ip = ip; 875 m = ip_reass(ipqe, fp, hash); 876 if (m == NULL) { 877 return; 878 } 879 IP_STATINC(IP_STAT_REASSEMBLED); 880 ip = mtod(m, struct ip *); 881 hlen = ip->ip_hl << 2; 882 ip->ip_len = htons(ntohs(ip->ip_len) + hlen); 883 } else if (fp) { 884 ip_freef(fp); 885 ip_reass_unlock(); 886 } 887 } 888 889 #if defined(IPSEC) 890 /* 891 * enforce IPsec policy checking if we are seeing last header. 892 * note that we do not visit this with protocols with pcb layer 893 * code - like udp/tcp/raw ip. 894 */ 895 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 && 896 ipsec4_in_reject(m, NULL)) { 897 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 898 goto bad; 899 } 900 #endif 901 #ifdef FAST_IPSEC 902 /* 903 * enforce IPsec policy checking if we are seeing last header. 904 * note that we do not visit this with protocols with pcb layer 905 * code - like udp/tcp/raw ip. 906 */ 907 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { 908 /* 909 * Check if the packet has already had IPsec processing 910 * done. If so, then just pass it along. This tag gets 911 * set during AH, ESP, etc. input handling, before the 912 * packet is returned to the ip input queue for delivery. 913 */ 914 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 915 s = splsoftnet(); 916 if (mtag != NULL) { 917 tdbi = (struct tdb_ident *)(mtag + 1); 918 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 919 } else { 920 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 921 IP_FORWARDING, &error); 922 } 923 if (sp != NULL) { 924 /* 925 * Check security policy against packet attributes. 926 */ 927 error = ipsec_in_reject(sp, m); 928 KEY_FREESP(&sp); 929 } else { 930 /* XXX error stat??? */ 931 error = EINVAL; 932 DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/ 933 } 934 splx(s); 935 if (error) 936 goto bad; 937 } 938 #endif /* FAST_IPSEC */ 939 940 /* 941 * Switch out to protocol's input routine. 942 */ 943 #if IFA_STATS 944 if (ia && ip) 945 ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 946 #endif 947 IP_STATINC(IP_STAT_DELIVERED); 948 { 949 int off = hlen, nh = ip->ip_p; 950 951 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 952 return; 953 } 954 bad: 955 m_freem(m); 956 return; 957 958 badcsum: 959 IP_STATINC(IP_STAT_BADSUM); 960 m_freem(m); 961 } 962 963 /* 964 * IP timer processing. 965 */ 966 void 967 ip_slowtimo(void) 968 { 969 970 mutex_enter(softnet_lock); 971 KERNEL_LOCK(1, NULL); 972 973 ip_reass_slowtimo(); 974 975 KERNEL_UNLOCK_ONE(NULL); 976 mutex_exit(softnet_lock); 977 } 978 979 /* 980 * IP drain processing. 981 */ 982 void 983 ip_drain(void) 984 { 985 986 KERNEL_LOCK(1, NULL); 987 ip_reass_drain(); 988 KERNEL_UNLOCK_ONE(NULL); 989 } 990 991 /* 992 * Do option processing on a datagram, 993 * possibly discarding it if bad options are encountered, 994 * or forwarding it if source-routed. 995 * Returns 1 if packet has been forwarded/freed, 996 * 0 if the packet should be processed further. 997 */ 998 int 999 ip_dooptions(struct mbuf *m) 1000 { 1001 struct ip *ip = mtod(m, struct ip *); 1002 u_char *cp, *cp0; 1003 struct ip_timestamp *ipt; 1004 struct in_ifaddr *ia; 1005 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 1006 struct in_addr dst; 1007 n_time ntime; 1008 1009 dst = ip->ip_dst; 1010 cp = (u_char *)(ip + 1); 1011 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 1012 for (; cnt > 0; cnt -= optlen, cp += optlen) { 1013 opt = cp[IPOPT_OPTVAL]; 1014 if (opt == IPOPT_EOL) 1015 break; 1016 if (opt == IPOPT_NOP) 1017 optlen = 1; 1018 else { 1019 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 1020 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1021 goto bad; 1022 } 1023 optlen = cp[IPOPT_OLEN]; 1024 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 1025 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1026 goto bad; 1027 } 1028 } 1029 switch (opt) { 1030 1031 default: 1032 break; 1033 1034 /* 1035 * Source routing with record. 1036 * Find interface with current destination address. 1037 * If none on this machine then drop if strictly routed, 1038 * or do nothing if loosely routed. 1039 * Record interface address and bring up next address 1040 * component. If strictly routed make sure next 1041 * address is on directly accessible net. 1042 */ 1043 case IPOPT_LSRR: 1044 case IPOPT_SSRR: 1045 if (ip_allowsrcrt == 0) { 1046 type = ICMP_UNREACH; 1047 code = ICMP_UNREACH_NET_PROHIB; 1048 goto bad; 1049 } 1050 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1051 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1052 goto bad; 1053 } 1054 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1055 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1056 goto bad; 1057 } 1058 ipaddr.sin_addr = ip->ip_dst; 1059 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 1060 if (ia == 0) { 1061 if (opt == IPOPT_SSRR) { 1062 type = ICMP_UNREACH; 1063 code = ICMP_UNREACH_SRCFAIL; 1064 goto bad; 1065 } 1066 /* 1067 * Loose routing, and not at next destination 1068 * yet; nothing to do except forward. 1069 */ 1070 break; 1071 } 1072 off--; /* 0 origin */ 1073 if ((off + sizeof(struct in_addr)) > optlen) { 1074 /* 1075 * End of source route. Should be for us. 1076 */ 1077 save_rte(cp, ip->ip_src); 1078 break; 1079 } 1080 /* 1081 * locate outgoing interface 1082 */ 1083 memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), 1084 sizeof(ipaddr.sin_addr)); 1085 if (opt == IPOPT_SSRR) 1086 ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr))); 1087 else 1088 ia = ip_rtaddr(ipaddr.sin_addr); 1089 if (ia == 0) { 1090 type = ICMP_UNREACH; 1091 code = ICMP_UNREACH_SRCFAIL; 1092 goto bad; 1093 } 1094 ip->ip_dst = ipaddr.sin_addr; 1095 bcopy((void *)&ia->ia_addr.sin_addr, 1096 (void *)(cp + off), sizeof(struct in_addr)); 1097 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1098 /* 1099 * Let ip_intr's mcast routing check handle mcast pkts 1100 */ 1101 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 1102 break; 1103 1104 case IPOPT_RR: 1105 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1106 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1107 goto bad; 1108 } 1109 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1110 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1111 goto bad; 1112 } 1113 /* 1114 * If no space remains, ignore. 1115 */ 1116 off--; /* 0 origin */ 1117 if ((off + sizeof(struct in_addr)) > optlen) 1118 break; 1119 memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst), 1120 sizeof(ipaddr.sin_addr)); 1121 /* 1122 * locate outgoing interface; if we're the destination, 1123 * use the incoming interface (should be same). 1124 */ 1125 if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))) 1126 == NULL && 1127 (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) { 1128 type = ICMP_UNREACH; 1129 code = ICMP_UNREACH_HOST; 1130 goto bad; 1131 } 1132 bcopy((void *)&ia->ia_addr.sin_addr, 1133 (void *)(cp + off), sizeof(struct in_addr)); 1134 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1135 break; 1136 1137 case IPOPT_TS: 1138 code = cp - (u_char *)ip; 1139 ipt = (struct ip_timestamp *)cp; 1140 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1141 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1142 goto bad; 1143 } 1144 if (ipt->ipt_ptr < 5) { 1145 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1146 goto bad; 1147 } 1148 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 1149 if (++ipt->ipt_oflw == 0) { 1150 code = (u_char *)&ipt->ipt_ptr - 1151 (u_char *)ip; 1152 goto bad; 1153 } 1154 break; 1155 } 1156 cp0 = (cp + ipt->ipt_ptr - 1); 1157 switch (ipt->ipt_flg) { 1158 1159 case IPOPT_TS_TSONLY: 1160 break; 1161 1162 case IPOPT_TS_TSANDADDR: 1163 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1164 sizeof(struct in_addr) > ipt->ipt_len) { 1165 code = (u_char *)&ipt->ipt_ptr - 1166 (u_char *)ip; 1167 goto bad; 1168 } 1169 ipaddr.sin_addr = dst; 1170 ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr), 1171 m->m_pkthdr.rcvif)); 1172 if (ia == 0) 1173 continue; 1174 bcopy(&ia->ia_addr.sin_addr, 1175 cp0, sizeof(struct in_addr)); 1176 ipt->ipt_ptr += sizeof(struct in_addr); 1177 break; 1178 1179 case IPOPT_TS_PRESPEC: 1180 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1181 sizeof(struct in_addr) > ipt->ipt_len) { 1182 code = (u_char *)&ipt->ipt_ptr - 1183 (u_char *)ip; 1184 goto bad; 1185 } 1186 memcpy(&ipaddr.sin_addr, cp0, 1187 sizeof(struct in_addr)); 1188 if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))) 1189 == NULL) 1190 continue; 1191 ipt->ipt_ptr += sizeof(struct in_addr); 1192 break; 1193 1194 default: 1195 /* XXX can't take &ipt->ipt_flg */ 1196 code = (u_char *)&ipt->ipt_ptr - 1197 (u_char *)ip + 1; 1198 goto bad; 1199 } 1200 ntime = iptime(); 1201 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1202 memmove((char *)cp + ipt->ipt_ptr - 1, cp0, 1203 sizeof(n_time)); 1204 ipt->ipt_ptr += sizeof(n_time); 1205 } 1206 } 1207 if (forward) { 1208 if (ip_forwsrcrt == 0) { 1209 type = ICMP_UNREACH; 1210 code = ICMP_UNREACH_SRCFAIL; 1211 goto bad; 1212 } 1213 ip_forward(m, 1); 1214 return (1); 1215 } 1216 return (0); 1217 bad: 1218 icmp_error(m, type, code, 0, 0); 1219 IP_STATINC(IP_STAT_BADOPTIONS); 1220 return (1); 1221 } 1222 1223 /* 1224 * Given address of next destination (final or next hop), 1225 * return internet address info of interface to be used to get there. 1226 */ 1227 struct in_ifaddr * 1228 ip_rtaddr(struct in_addr dst) 1229 { 1230 struct rtentry *rt; 1231 union { 1232 struct sockaddr dst; 1233 struct sockaddr_in dst4; 1234 } u; 1235 1236 sockaddr_in_init(&u.dst4, &dst, 0); 1237 1238 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) 1239 return NULL; 1240 1241 return ifatoia(rt->rt_ifa); 1242 } 1243 1244 /* 1245 * Save incoming source route for use in replies, 1246 * to be picked up later by ip_srcroute if the receiver is interested. 1247 */ 1248 void 1249 save_rte(u_char *option, struct in_addr dst) 1250 { 1251 unsigned olen; 1252 1253 olen = option[IPOPT_OLEN]; 1254 #ifdef DIAGNOSTIC 1255 if (ipprintfs) 1256 printf("save_rte: olen %d\n", olen); 1257 #endif /* 0 */ 1258 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1259 return; 1260 memcpy((void *)ip_srcrt.srcopt, (void *)option, olen); 1261 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1262 ip_srcrt.dst = dst; 1263 } 1264 1265 /* 1266 * Retrieve incoming source route for use in replies, 1267 * in the same form used by setsockopt. 1268 * The first hop is placed before the options, will be removed later. 1269 */ 1270 struct mbuf * 1271 ip_srcroute(void) 1272 { 1273 struct in_addr *p, *q; 1274 struct mbuf *m; 1275 1276 if (ip_nhops == 0) 1277 return NULL; 1278 m = m_get(M_DONTWAIT, MT_SOOPTS); 1279 if (m == 0) 1280 return NULL; 1281 1282 MCLAIM(m, &inetdomain.dom_mowner); 1283 #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1284 1285 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1286 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1287 OPTSIZ; 1288 #ifdef DIAGNOSTIC 1289 if (ipprintfs) 1290 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1291 #endif 1292 1293 /* 1294 * First save first hop for return route 1295 */ 1296 p = &ip_srcrt.route[ip_nhops - 1]; 1297 *(mtod(m, struct in_addr *)) = *p--; 1298 #ifdef DIAGNOSTIC 1299 if (ipprintfs) 1300 printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr)); 1301 #endif 1302 1303 /* 1304 * Copy option fields and padding (nop) to mbuf. 1305 */ 1306 ip_srcrt.nop = IPOPT_NOP; 1307 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1308 memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop, 1309 OPTSIZ); 1310 q = (struct in_addr *)(mtod(m, char *) + 1311 sizeof(struct in_addr) + OPTSIZ); 1312 #undef OPTSIZ 1313 /* 1314 * Record return path as an IP source route, 1315 * reversing the path (pointers are now aligned). 1316 */ 1317 while (p >= ip_srcrt.route) { 1318 #ifdef DIAGNOSTIC 1319 if (ipprintfs) 1320 printf(" %x", ntohl(q->s_addr)); 1321 #endif 1322 *q++ = *p--; 1323 } 1324 /* 1325 * Last hop goes to final destination. 1326 */ 1327 *q = ip_srcrt.dst; 1328 #ifdef DIAGNOSTIC 1329 if (ipprintfs) 1330 printf(" %x\n", ntohl(q->s_addr)); 1331 #endif 1332 return (m); 1333 } 1334 1335 const int inetctlerrmap[PRC_NCMDS] = { 1336 [PRC_MSGSIZE] = EMSGSIZE, 1337 [PRC_HOSTDEAD] = EHOSTDOWN, 1338 [PRC_HOSTUNREACH] = EHOSTUNREACH, 1339 [PRC_UNREACH_NET] = EHOSTUNREACH, 1340 [PRC_UNREACH_HOST] = EHOSTUNREACH, 1341 [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, 1342 [PRC_UNREACH_PORT] = ECONNREFUSED, 1343 [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, 1344 [PRC_PARAMPROB] = ENOPROTOOPT, 1345 }; 1346 1347 /* 1348 * Forward a packet. If some error occurs return the sender 1349 * an icmp packet. Note we can't always generate a meaningful 1350 * icmp message because icmp doesn't have a large enough repertoire 1351 * of codes and types. 1352 * 1353 * If not forwarding, just drop the packet. This could be confusing 1354 * if ipforwarding was zero but some routing protocol was advancing 1355 * us as a gateway to somewhere. However, we must let the routing 1356 * protocol deal with that. 1357 * 1358 * The srcrt parameter indicates whether the packet is being forwarded 1359 * via a source route. 1360 */ 1361 void 1362 ip_forward(struct mbuf *m, int srcrt) 1363 { 1364 struct ip *ip = mtod(m, struct ip *); 1365 struct rtentry *rt; 1366 int error, type = 0, code = 0, destmtu = 0; 1367 struct mbuf *mcopy; 1368 n_long dest; 1369 union { 1370 struct sockaddr dst; 1371 struct sockaddr_in dst4; 1372 } u; 1373 1374 /* 1375 * We are now in the output path. 1376 */ 1377 MCLAIM(m, &ip_tx_mowner); 1378 1379 /* 1380 * Clear any in-bound checksum flags for this packet. 1381 */ 1382 m->m_pkthdr.csum_flags = 0; 1383 1384 dest = 0; 1385 #ifdef DIAGNOSTIC 1386 if (ipprintfs) { 1387 printf("forward: src %s ", inet_ntoa(ip->ip_src)); 1388 printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl); 1389 } 1390 #endif 1391 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1392 IP_STATINC(IP_STAT_CANTFORWARD); 1393 m_freem(m); 1394 return; 1395 } 1396 if (ip->ip_ttl <= IPTTLDEC) { 1397 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1398 return; 1399 } 1400 1401 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1402 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) { 1403 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); 1404 return; 1405 } 1406 1407 /* 1408 * Save at most 68 bytes of the packet in case 1409 * we need to generate an ICMP message to the src. 1410 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1411 */ 1412 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1413 if (mcopy) 1414 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1415 1416 ip->ip_ttl -= IPTTLDEC; 1417 1418 /* 1419 * If forwarding packet using same interface that it came in on, 1420 * perhaps should send a redirect to sender to shortcut a hop. 1421 * Only send redirect if source is sending directly to us, 1422 * and if packet was not source routed (or has any options). 1423 * Also, don't send redirect if forwarding using a default route 1424 * or a route modified by a redirect. 1425 */ 1426 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1427 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1428 !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && 1429 ipsendredirects && !srcrt) { 1430 if (rt->rt_ifa && 1431 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1432 ifatoia(rt->rt_ifa)->ia_subnet) { 1433 if (rt->rt_flags & RTF_GATEWAY) 1434 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1435 else 1436 dest = ip->ip_dst.s_addr; 1437 /* 1438 * Router requirements says to only send host 1439 * redirects. 1440 */ 1441 type = ICMP_REDIRECT; 1442 code = ICMP_REDIRECT_HOST; 1443 #ifdef DIAGNOSTIC 1444 if (ipprintfs) 1445 printf("redirect (%d) to %x\n", code, 1446 (u_int32_t)dest); 1447 #endif 1448 } 1449 } 1450 1451 error = ip_output(m, NULL, &ipforward_rt, 1452 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 1453 (struct ip_moptions *)NULL, (struct socket *)NULL); 1454 1455 if (error) 1456 IP_STATINC(IP_STAT_CANTFORWARD); 1457 else { 1458 uint64_t *ips = IP_STAT_GETREF(); 1459 ips[IP_STAT_FORWARD]++; 1460 if (type) { 1461 ips[IP_STAT_REDIRECTSENT]++; 1462 IP_STAT_PUTREF(); 1463 } else { 1464 IP_STAT_PUTREF(); 1465 if (mcopy) { 1466 #ifdef GATEWAY 1467 if (mcopy->m_flags & M_CANFASTFWD) 1468 ipflow_create(&ipforward_rt, mcopy); 1469 #endif 1470 m_freem(mcopy); 1471 } 1472 return; 1473 } 1474 } 1475 if (mcopy == NULL) 1476 return; 1477 1478 switch (error) { 1479 1480 case 0: /* forwarded, but need redirect */ 1481 /* type, code set above */ 1482 break; 1483 1484 case ENETUNREACH: /* shouldn't happen, checked above */ 1485 case EHOSTUNREACH: 1486 case ENETDOWN: 1487 case EHOSTDOWN: 1488 default: 1489 type = ICMP_UNREACH; 1490 code = ICMP_UNREACH_HOST; 1491 break; 1492 1493 case EMSGSIZE: 1494 type = ICMP_UNREACH; 1495 code = ICMP_UNREACH_NEEDFRAG; 1496 1497 if ((rt = rtcache_validate(&ipforward_rt)) != NULL) 1498 destmtu = rt->rt_ifp->if_mtu; 1499 1500 #if defined(IPSEC) || defined(FAST_IPSEC) 1501 { 1502 /* 1503 * If the packet is routed over IPsec tunnel, tell the 1504 * originator the tunnel MTU. 1505 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 1506 * XXX quickhack!!! 1507 */ 1508 1509 struct secpolicy *sp; 1510 int ipsecerror; 1511 size_t ipsechdr; 1512 struct route *ro; 1513 1514 sp = ipsec4_getpolicybyaddr(mcopy, 1515 IPSEC_DIR_OUTBOUND, IP_FORWARDING, 1516 &ipsecerror); 1517 1518 if (sp != NULL) { 1519 /* count IPsec header size */ 1520 ipsechdr = ipsec4_hdrsiz(mcopy, 1521 IPSEC_DIR_OUTBOUND, NULL); 1522 1523 /* 1524 * find the correct route for outer IPv4 1525 * header, compute tunnel MTU. 1526 */ 1527 1528 if (sp->req != NULL 1529 && sp->req->sav != NULL 1530 && sp->req->sav->sah != NULL) { 1531 ro = &sp->req->sav->sah->sa_route; 1532 rt = rtcache_validate(ro); 1533 if (rt && rt->rt_ifp) { 1534 destmtu = 1535 rt->rt_rmx.rmx_mtu ? 1536 rt->rt_rmx.rmx_mtu : 1537 rt->rt_ifp->if_mtu; 1538 destmtu -= ipsechdr; 1539 } 1540 } 1541 1542 #ifdef IPSEC 1543 key_freesp(sp); 1544 #else 1545 KEY_FREESP(&sp); 1546 #endif 1547 } 1548 } 1549 #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/ 1550 IP_STATINC(IP_STAT_CANTFRAG); 1551 break; 1552 1553 case ENOBUFS: 1554 #if 1 1555 /* 1556 * a router should not generate ICMP_SOURCEQUENCH as 1557 * required in RFC1812 Requirements for IP Version 4 Routers. 1558 * source quench could be a big problem under DoS attacks, 1559 * or if the underlying interface is rate-limited. 1560 */ 1561 if (mcopy) 1562 m_freem(mcopy); 1563 return; 1564 #else 1565 type = ICMP_SOURCEQUENCH; 1566 code = 0; 1567 break; 1568 #endif 1569 } 1570 icmp_error(mcopy, type, code, dest, destmtu); 1571 } 1572 1573 void 1574 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1575 struct mbuf *m) 1576 { 1577 1578 if (inp->inp_socket->so_options & SO_TIMESTAMP 1579 #ifdef SO_OTIMESTAMP 1580 || inp->inp_socket->so_options & SO_OTIMESTAMP 1581 #endif 1582 ) { 1583 struct timeval tv; 1584 1585 microtime(&tv); 1586 #ifdef SO_OTIMESTAMP 1587 if (inp->inp_socket->so_options & SO_OTIMESTAMP) { 1588 struct timeval50 tv50; 1589 timeval_to_timeval50(&tv, &tv50); 1590 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1591 SCM_OTIMESTAMP, SOL_SOCKET); 1592 } else 1593 #endif 1594 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1595 SCM_TIMESTAMP, SOL_SOCKET); 1596 if (*mp) 1597 mp = &(*mp)->m_next; 1598 } 1599 if (inp->inp_flags & INP_RECVDSTADDR) { 1600 *mp = sbcreatecontrol((void *) &ip->ip_dst, 1601 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1602 if (*mp) 1603 mp = &(*mp)->m_next; 1604 } 1605 #ifdef notyet 1606 /* 1607 * XXX 1608 * Moving these out of udp_input() made them even more broken 1609 * than they already were. 1610 * - fenner@parc.xerox.com 1611 */ 1612 /* options were tossed already */ 1613 if (inp->inp_flags & INP_RECVOPTS) { 1614 *mp = sbcreatecontrol((void *) opts_deleted_above, 1615 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1616 if (*mp) 1617 mp = &(*mp)->m_next; 1618 } 1619 /* ip_srcroute doesn't do what we want here, need to fix */ 1620 if (inp->inp_flags & INP_RECVRETOPTS) { 1621 *mp = sbcreatecontrol((void *) ip_srcroute(), 1622 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1623 if (*mp) 1624 mp = &(*mp)->m_next; 1625 } 1626 #endif 1627 if (inp->inp_flags & INP_RECVIF) { 1628 struct sockaddr_dl sdl; 1629 1630 sockaddr_dl_init(&sdl, sizeof(sdl), 1631 (m->m_pkthdr.rcvif != NULL) 1632 ? m->m_pkthdr.rcvif->if_index 1633 : 0, 1634 0, NULL, 0, NULL, 0); 1635 *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); 1636 if (*mp) 1637 mp = &(*mp)->m_next; 1638 } 1639 if (inp->inp_flags & INP_RECVTTL) { 1640 *mp = sbcreatecontrol((void *) &ip->ip_ttl, 1641 sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); 1642 if (*mp) 1643 mp = &(*mp)->m_next; 1644 } 1645 } 1646 1647 /* 1648 * sysctl helper routine for net.inet.ip.forwsrcrt. 1649 */ 1650 static int 1651 sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) 1652 { 1653 int error, tmp; 1654 struct sysctlnode node; 1655 1656 node = *rnode; 1657 tmp = ip_forwsrcrt; 1658 node.sysctl_data = &tmp; 1659 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1660 if (error || newp == NULL) 1661 return (error); 1662 1663 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, 1664 0, NULL, NULL, NULL); 1665 if (error) 1666 return (error); 1667 1668 ip_forwsrcrt = tmp; 1669 1670 return (0); 1671 } 1672 1673 /* 1674 * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the 1675 * range of the new value and tweaks timers if it changes. 1676 */ 1677 static int 1678 sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) 1679 { 1680 int error, tmp; 1681 struct sysctlnode node; 1682 1683 node = *rnode; 1684 tmp = ip_mtudisc_timeout; 1685 node.sysctl_data = &tmp; 1686 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1687 if (error || newp == NULL) 1688 return (error); 1689 if (tmp < 0) 1690 return (EINVAL); 1691 1692 mutex_enter(softnet_lock); 1693 1694 ip_mtudisc_timeout = tmp; 1695 rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); 1696 1697 mutex_exit(softnet_lock); 1698 1699 return (0); 1700 } 1701 1702 #ifdef GATEWAY 1703 /* 1704 * sysctl helper routine for net.inet.ip.maxflows. 1705 */ 1706 static int 1707 sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS) 1708 { 1709 int error; 1710 1711 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1712 if (error || newp == NULL) 1713 return (error); 1714 1715 mutex_enter(softnet_lock); 1716 KERNEL_LOCK(1, NULL); 1717 1718 ipflow_prune(); 1719 1720 KERNEL_UNLOCK_ONE(NULL); 1721 mutex_exit(softnet_lock); 1722 1723 return (0); 1724 } 1725 1726 static int 1727 sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS) 1728 { 1729 int error, tmp; 1730 struct sysctlnode node; 1731 1732 node = *rnode; 1733 tmp = ip_hashsize; 1734 node.sysctl_data = &tmp; 1735 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1736 if (error || newp == NULL) 1737 return (error); 1738 1739 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1740 /* 1741 * Can only fail due to malloc() 1742 */ 1743 mutex_enter(softnet_lock); 1744 KERNEL_LOCK(1, NULL); 1745 1746 error = ipflow_invalidate_all(tmp); 1747 1748 KERNEL_UNLOCK_ONE(NULL); 1749 mutex_exit(softnet_lock); 1750 1751 } else { 1752 /* 1753 * EINVAL if not a power of 2 1754 */ 1755 error = EINVAL; 1756 } 1757 1758 return error; 1759 } 1760 #endif /* GATEWAY */ 1761 1762 static int 1763 sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) 1764 { 1765 1766 return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); 1767 } 1768 1769 static void 1770 sysctl_net_inet_ip_setup(struct sysctllog **clog) 1771 { 1772 extern int subnetsarelocal, hostzeroisbroadcast; 1773 1774 sysctl_createv(clog, 0, NULL, NULL, 1775 CTLFLAG_PERMANENT, 1776 CTLTYPE_NODE, "net", NULL, 1777 NULL, 0, NULL, 0, 1778 CTL_NET, CTL_EOL); 1779 sysctl_createv(clog, 0, NULL, NULL, 1780 CTLFLAG_PERMANENT, 1781 CTLTYPE_NODE, "inet", 1782 SYSCTL_DESCR("PF_INET related settings"), 1783 NULL, 0, NULL, 0, 1784 CTL_NET, PF_INET, CTL_EOL); 1785 sysctl_createv(clog, 0, NULL, NULL, 1786 CTLFLAG_PERMANENT, 1787 CTLTYPE_NODE, "ip", 1788 SYSCTL_DESCR("IPv4 related settings"), 1789 NULL, 0, NULL, 0, 1790 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 1791 1792 sysctl_createv(clog, 0, NULL, NULL, 1793 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1794 CTLTYPE_INT, "forwarding", 1795 SYSCTL_DESCR("Enable forwarding of INET datagrams"), 1796 NULL, 0, &ipforwarding, 0, 1797 CTL_NET, PF_INET, IPPROTO_IP, 1798 IPCTL_FORWARDING, CTL_EOL); 1799 sysctl_createv(clog, 0, NULL, NULL, 1800 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1801 CTLTYPE_INT, "redirect", 1802 SYSCTL_DESCR("Enable sending of ICMP redirect messages"), 1803 NULL, 0, &ipsendredirects, 0, 1804 CTL_NET, PF_INET, IPPROTO_IP, 1805 IPCTL_SENDREDIRECTS, CTL_EOL); 1806 sysctl_createv(clog, 0, NULL, NULL, 1807 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1808 CTLTYPE_INT, "ttl", 1809 SYSCTL_DESCR("Default TTL for an INET datagram"), 1810 NULL, 0, &ip_defttl, 0, 1811 CTL_NET, PF_INET, IPPROTO_IP, 1812 IPCTL_DEFTTL, CTL_EOL); 1813 #ifdef IPCTL_DEFMTU 1814 sysctl_createv(clog, 0, NULL, NULL, 1815 CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */, 1816 CTLTYPE_INT, "mtu", 1817 SYSCTL_DESCR("Default MTA for an INET route"), 1818 NULL, 0, &ip_mtu, 0, 1819 CTL_NET, PF_INET, IPPROTO_IP, 1820 IPCTL_DEFMTU, CTL_EOL); 1821 #endif /* IPCTL_DEFMTU */ 1822 sysctl_createv(clog, 0, NULL, NULL, 1823 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1824 CTLTYPE_INT, "forwsrcrt", 1825 SYSCTL_DESCR("Enable forwarding of source-routed " 1826 "datagrams"), 1827 sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, 1828 CTL_NET, PF_INET, IPPROTO_IP, 1829 IPCTL_FORWSRCRT, CTL_EOL); 1830 sysctl_createv(clog, 0, NULL, NULL, 1831 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1832 CTLTYPE_INT, "directed-broadcast", 1833 SYSCTL_DESCR("Enable forwarding of broadcast datagrams"), 1834 NULL, 0, &ip_directedbcast, 0, 1835 CTL_NET, PF_INET, IPPROTO_IP, 1836 IPCTL_DIRECTEDBCAST, CTL_EOL); 1837 sysctl_createv(clog, 0, NULL, NULL, 1838 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1839 CTLTYPE_INT, "allowsrcrt", 1840 SYSCTL_DESCR("Accept source-routed datagrams"), 1841 NULL, 0, &ip_allowsrcrt, 0, 1842 CTL_NET, PF_INET, IPPROTO_IP, 1843 IPCTL_ALLOWSRCRT, CTL_EOL); 1844 sysctl_createv(clog, 0, NULL, NULL, 1845 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1846 CTLTYPE_INT, "subnetsarelocal", 1847 SYSCTL_DESCR("Whether logical subnets are considered " 1848 "local"), 1849 NULL, 0, &subnetsarelocal, 0, 1850 CTL_NET, PF_INET, IPPROTO_IP, 1851 IPCTL_SUBNETSARELOCAL, CTL_EOL); 1852 sysctl_createv(clog, 0, NULL, NULL, 1853 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1854 CTLTYPE_INT, "mtudisc", 1855 SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"), 1856 NULL, 0, &ip_mtudisc, 0, 1857 CTL_NET, PF_INET, IPPROTO_IP, 1858 IPCTL_MTUDISC, CTL_EOL); 1859 sysctl_createv(clog, 0, NULL, NULL, 1860 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1861 CTLTYPE_INT, "anonportmin", 1862 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1863 sysctl_net_inet_ip_ports, 0, &anonportmin, 0, 1864 CTL_NET, PF_INET, IPPROTO_IP, 1865 IPCTL_ANONPORTMIN, CTL_EOL); 1866 sysctl_createv(clog, 0, NULL, NULL, 1867 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1868 CTLTYPE_INT, "anonportmax", 1869 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1870 sysctl_net_inet_ip_ports, 0, &anonportmax, 0, 1871 CTL_NET, PF_INET, IPPROTO_IP, 1872 IPCTL_ANONPORTMAX, CTL_EOL); 1873 sysctl_createv(clog, 0, NULL, NULL, 1874 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1875 CTLTYPE_INT, "mtudisctimeout", 1876 SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"), 1877 sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0, 1878 CTL_NET, PF_INET, IPPROTO_IP, 1879 IPCTL_MTUDISCTIMEOUT, CTL_EOL); 1880 #ifdef GATEWAY 1881 sysctl_createv(clog, 0, NULL, NULL, 1882 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1883 CTLTYPE_INT, "maxflows", 1884 SYSCTL_DESCR("Number of flows for fast forwarding"), 1885 sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0, 1886 CTL_NET, PF_INET, IPPROTO_IP, 1887 IPCTL_MAXFLOWS, CTL_EOL); 1888 sysctl_createv(clog, 0, NULL, NULL, 1889 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1890 CTLTYPE_INT, "hashsize", 1891 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"), 1892 sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0, 1893 CTL_NET, PF_INET, IPPROTO_IP, 1894 CTL_CREATE, CTL_EOL); 1895 #endif /* GATEWAY */ 1896 sysctl_createv(clog, 0, NULL, NULL, 1897 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1898 CTLTYPE_INT, "hostzerobroadcast", 1899 SYSCTL_DESCR("All zeroes address is broadcast address"), 1900 NULL, 0, &hostzeroisbroadcast, 0, 1901 CTL_NET, PF_INET, IPPROTO_IP, 1902 IPCTL_HOSTZEROBROADCAST, CTL_EOL); 1903 #if NGIF > 0 1904 sysctl_createv(clog, 0, NULL, NULL, 1905 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1906 CTLTYPE_INT, "gifttl", 1907 SYSCTL_DESCR("Default TTL for a gif tunnel datagram"), 1908 NULL, 0, &ip_gif_ttl, 0, 1909 CTL_NET, PF_INET, IPPROTO_IP, 1910 IPCTL_GIF_TTL, CTL_EOL); 1911 #endif /* NGIF */ 1912 #ifndef IPNOPRIVPORTS 1913 sysctl_createv(clog, 0, NULL, NULL, 1914 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1915 CTLTYPE_INT, "lowportmin", 1916 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1917 "to assign"), 1918 sysctl_net_inet_ip_ports, 0, &lowportmin, 0, 1919 CTL_NET, PF_INET, IPPROTO_IP, 1920 IPCTL_LOWPORTMIN, CTL_EOL); 1921 sysctl_createv(clog, 0, NULL, NULL, 1922 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1923 CTLTYPE_INT, "lowportmax", 1924 SYSCTL_DESCR("Highest privileged ephemeral port number " 1925 "to assign"), 1926 sysctl_net_inet_ip_ports, 0, &lowportmax, 0, 1927 CTL_NET, PF_INET, IPPROTO_IP, 1928 IPCTL_LOWPORTMAX, CTL_EOL); 1929 #endif /* IPNOPRIVPORTS */ 1930 #if NGRE > 0 1931 sysctl_createv(clog, 0, NULL, NULL, 1932 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1933 CTLTYPE_INT, "grettl", 1934 SYSCTL_DESCR("Default TTL for a gre tunnel datagram"), 1935 NULL, 0, &ip_gre_ttl, 0, 1936 CTL_NET, PF_INET, IPPROTO_IP, 1937 IPCTL_GRE_TTL, CTL_EOL); 1938 #endif /* NGRE */ 1939 sysctl_createv(clog, 0, NULL, NULL, 1940 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1941 CTLTYPE_INT, "checkinterface", 1942 SYSCTL_DESCR("Enable receive side of Strong ES model " 1943 "from RFC1122"), 1944 NULL, 0, &ip_checkinterface, 0, 1945 CTL_NET, PF_INET, IPPROTO_IP, 1946 IPCTL_CHECKINTERFACE, CTL_EOL); 1947 sysctl_createv(clog, 0, NULL, NULL, 1948 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1949 CTLTYPE_INT, "random_id", 1950 SYSCTL_DESCR("Assign random ip_id values"), 1951 NULL, 0, &ip_do_randomid, 0, 1952 CTL_NET, PF_INET, IPPROTO_IP, 1953 IPCTL_RANDOMID, CTL_EOL); 1954 sysctl_createv(clog, 0, NULL, NULL, 1955 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1956 CTLTYPE_INT, "do_loopback_cksum", 1957 SYSCTL_DESCR("Perform IP checksum on loopback"), 1958 NULL, 0, &ip_do_loopback_cksum, 0, 1959 CTL_NET, PF_INET, IPPROTO_IP, 1960 IPCTL_LOOPBACKCKSUM, CTL_EOL); 1961 sysctl_createv(clog, 0, NULL, NULL, 1962 CTLFLAG_PERMANENT, 1963 CTLTYPE_STRUCT, "stats", 1964 SYSCTL_DESCR("IP statistics"), 1965 sysctl_net_inet_ip_stats, 0, NULL, 0, 1966 CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, 1967 CTL_EOL); 1968 } 1969 1970 void 1971 ip_statinc(u_int stat) 1972 { 1973 1974 KASSERT(stat < IP_NSTATS); 1975 IP_STATINC(stat); 1976 } 1977