1 /* $NetBSD: ip_input.c,v 1.294 2011/04/14 20:32:04 dyoung 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 1.294 2011/04/14 20:32:04 dyoung 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 u_long in_ifaddrhash; /* size of hash table - 1 */ 225 int in_ifaddrentries; /* total number of addrs */ 226 struct in_ifaddrhead in_ifaddrhead; 227 struct in_ifaddrhashhead *in_ifaddrhashtbl; 228 u_long in_multihash; /* size of hash table - 1 */ 229 int in_multientries; /* total number of addrs */ 230 struct in_multihashhead *in_multihashtbl; 231 struct ifqueue ipintrq; 232 233 ipid_state_t * ip_ids; 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_ids = ip_id_init(); 319 ip_id = time_second & 0xfffff; 320 321 ipintrq.ifq_maxlen = IFQ_MAXLEN; 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)); 368 369 mutex_enter(softnet_lock); 370 KERNEL_LOCK(1, NULL); 371 if (!IF_IS_EMPTY(&ipintrq)) { 372 s = splnet(); 373 374 /* Take existing queue onto stack */ 375 lcl_intrq = ipintrq; 376 377 /* Zero out global queue, preserving maxlen and drops */ 378 ipintrq.ifq_head = NULL; 379 ipintrq.ifq_tail = NULL; 380 ipintrq.ifq_len = 0; 381 ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen; 382 ipintrq.ifq_drops = lcl_intrq.ifq_drops; 383 384 splx(s); 385 } 386 KERNEL_UNLOCK_ONE(NULL); 387 while (!IF_IS_EMPTY(&lcl_intrq)) { 388 IF_DEQUEUE(&lcl_intrq, m); 389 if (m == NULL) 390 break; 391 ip_input(m); 392 } 393 mutex_exit(softnet_lock); 394 } 395 396 /* 397 * Ip input routine. Checksum and byte swap header. If fragmented 398 * try to reassemble. Process options. Pass to next level. 399 */ 400 void 401 ip_input(struct mbuf *m) 402 { 403 struct ip *ip = NULL; 404 struct in_ifaddr *ia; 405 struct ifaddr *ifa; 406 int hlen = 0, len; 407 int downmatch; 408 int checkif; 409 int srcrt = 0; 410 #ifdef FAST_IPSEC 411 struct m_tag *mtag; 412 struct tdb_ident *tdbi; 413 struct secpolicy *sp; 414 int error, s; 415 #endif /* FAST_IPSEC */ 416 417 MCLAIM(m, &ip_rx_mowner); 418 KASSERT((m->m_flags & M_PKTHDR) != 0); 419 420 /* 421 * If no IP addresses have been set yet but the interfaces 422 * are receiving, can't do anything with incoming packets yet. 423 */ 424 if (TAILQ_FIRST(&in_ifaddrhead) == 0) 425 goto bad; 426 IP_STATINC(IP_STAT_TOTAL); 427 /* 428 * If the IP header is not aligned, slurp it up into a new 429 * mbuf with space for link headers, in the event we forward 430 * it. Otherwise, if it is aligned, make sure the entire 431 * base IP header is in the first mbuf of the chain. 432 */ 433 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 434 if ((m = m_copyup(m, sizeof(struct ip), 435 (max_linkhdr + 3) & ~3)) == NULL) { 436 /* XXXJRT new stat, please */ 437 IP_STATINC(IP_STAT_TOOSMALL); 438 return; 439 } 440 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 441 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 442 IP_STATINC(IP_STAT_TOOSMALL); 443 return; 444 } 445 } 446 ip = mtod(m, struct ip *); 447 if (ip->ip_v != IPVERSION) { 448 IP_STATINC(IP_STAT_BADVERS); 449 goto bad; 450 } 451 hlen = ip->ip_hl << 2; 452 if (hlen < sizeof(struct ip)) { /* minimum header length */ 453 IP_STATINC(IP_STAT_BADHLEN); 454 goto bad; 455 } 456 if (hlen > m->m_len) { 457 if ((m = m_pullup(m, hlen)) == 0) { 458 IP_STATINC(IP_STAT_BADHLEN); 459 return; 460 } 461 ip = mtod(m, struct ip *); 462 } 463 464 /* 465 * RFC1122: packets with a multicast source address are 466 * not allowed. 467 */ 468 if (IN_MULTICAST(ip->ip_src.s_addr)) { 469 IP_STATINC(IP_STAT_BADADDR); 470 goto bad; 471 } 472 473 /* 127/8 must not appear on wire - RFC1122 */ 474 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 475 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 476 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 477 IP_STATINC(IP_STAT_BADADDR); 478 goto bad; 479 } 480 } 481 482 switch (m->m_pkthdr.csum_flags & 483 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 484 M_CSUM_IPv4_BAD)) { 485 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 486 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 487 goto badcsum; 488 489 case M_CSUM_IPv4: 490 /* Checksum was okay. */ 491 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 492 break; 493 494 default: 495 /* 496 * Must compute it ourselves. Maybe skip checksum on 497 * loopback interfaces. 498 */ 499 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 500 IFF_LOOPBACK) || ip_do_loopback_cksum)) { 501 INET_CSUM_COUNTER_INCR(&ip_swcsum); 502 if (in_cksum(m, hlen) != 0) 503 goto badcsum; 504 } 505 break; 506 } 507 508 /* Retrieve the packet length. */ 509 len = ntohs(ip->ip_len); 510 511 /* 512 * Check for additional length bogosity 513 */ 514 if (len < hlen) { 515 IP_STATINC(IP_STAT_BADLEN); 516 goto bad; 517 } 518 519 /* 520 * Check that the amount of data in the buffers 521 * is as at least much as the IP header would have us expect. 522 * Trim mbufs if longer than we expect. 523 * Drop packet if shorter than we expect. 524 */ 525 if (m->m_pkthdr.len < len) { 526 IP_STATINC(IP_STAT_TOOSHORT); 527 goto bad; 528 } 529 if (m->m_pkthdr.len > len) { 530 if (m->m_len == m->m_pkthdr.len) { 531 m->m_len = len; 532 m->m_pkthdr.len = len; 533 } else 534 m_adj(m, len - m->m_pkthdr.len); 535 } 536 537 #if defined(IPSEC) 538 /* ipflow (IP fast forwarding) is not compatible with IPsec. */ 539 m->m_flags &= ~M_CANFASTFWD; 540 #else 541 /* 542 * Assume that we can create a fast-forward IP flow entry 543 * based on this packet. 544 */ 545 m->m_flags |= M_CANFASTFWD; 546 #endif 547 548 #ifdef PFIL_HOOKS 549 /* 550 * Run through list of hooks for input packets. If there are any 551 * filters which require that additional packets in the flow are 552 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 553 * Note that filters must _never_ set this flag, as another filter 554 * in the list may have previously cleared it. 555 */ 556 /* 557 * let ipfilter look at packet on the wire, 558 * not the decapsulated packet. 559 */ 560 #ifdef IPSEC 561 if (!ipsec_getnhist(m)) 562 #elif defined(FAST_IPSEC) 563 if (!ipsec_indone(m)) 564 #else 565 if (1) 566 #endif 567 { 568 struct in_addr odst; 569 570 odst = ip->ip_dst; 571 if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif, 572 PFIL_IN) != 0) 573 return; 574 if (m == NULL) 575 return; 576 ip = mtod(m, struct ip *); 577 hlen = ip->ip_hl << 2; 578 /* 579 * XXX The setting of "srcrt" here is to prevent ip_forward() 580 * from generating ICMP redirects for packets that have 581 * been redirected by a hook back out on to the same LAN that 582 * they came from and is not an indication that the packet 583 * is being inffluenced by source routing options. This 584 * allows things like 585 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" 586 * where tlp0 is both on the 1.1.1.0/24 network and is the 587 * default route for hosts on 1.1.1.0/24. Of course this 588 * also requires a "map tlp0 ..." to complete the story. 589 * One might argue whether or not this kind of network config. 590 * should be supported in this manner... 591 */ 592 srcrt = (odst.s_addr != ip->ip_dst.s_addr); 593 } 594 #endif /* PFIL_HOOKS */ 595 596 #ifdef ALTQ 597 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 598 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) { 599 /* packet dropped by traffic conditioner */ 600 return; 601 } 602 #endif 603 604 /* 605 * Process options and, if not destined for us, 606 * ship it on. ip_dooptions returns 1 when an 607 * error was detected (causing an icmp message 608 * to be sent and the original packet to be freed). 609 */ 610 ip_nhops = 0; /* for source routed packets */ 611 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 612 return; 613 614 /* 615 * Enable a consistency check between the destination address 616 * and the arrival interface for a unicast packet (the RFC 1122 617 * strong ES model) if IP forwarding is disabled and the packet 618 * is not locally generated. 619 * 620 * XXX - Checking also should be disabled if the destination 621 * address is ipnat'ed to a different interface. 622 * 623 * XXX - Checking is incompatible with IP aliases added 624 * to the loopback interface instead of the interface where 625 * the packets are received. 626 * 627 * XXX - We need to add a per ifaddr flag for this so that 628 * we get finer grain control. 629 */ 630 checkif = ip_checkinterface && (ipforwarding == 0) && 631 (m->m_pkthdr.rcvif != NULL) && 632 ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0); 633 634 /* 635 * Check our list of addresses, to see if the packet is for us. 636 * 637 * Traditional 4.4BSD did not consult IFF_UP at all. 638 * The behavior here is to treat addresses on !IFF_UP interface 639 * as not mine. 640 */ 641 downmatch = 0; 642 LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 643 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 644 if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif) 645 continue; 646 if ((ia->ia_ifp->if_flags & IFF_UP) != 0) 647 break; 648 else 649 downmatch++; 650 } 651 } 652 if (ia != NULL) 653 goto ours; 654 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { 655 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 656 if (ifa->ifa_addr->sa_family != AF_INET) 657 continue; 658 ia = ifatoia(ifa); 659 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 660 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 661 /* 662 * Look for all-0's host part (old broadcast addr), 663 * either for subnet or net. 664 */ 665 ip->ip_dst.s_addr == ia->ia_subnet || 666 ip->ip_dst.s_addr == ia->ia_net) 667 goto ours; 668 /* 669 * An interface with IP address zero accepts 670 * all packets that arrive on that interface. 671 */ 672 if (in_nullhost(ia->ia_addr.sin_addr)) 673 goto ours; 674 } 675 } 676 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 677 struct in_multi *inm; 678 #ifdef MROUTING 679 extern struct socket *ip_mrouter; 680 681 if (ip_mrouter) { 682 /* 683 * If we are acting as a multicast router, all 684 * incoming multicast packets are passed to the 685 * kernel-level multicast forwarding function. 686 * The packet is returned (relatively) intact; if 687 * ip_mforward() returns a non-zero value, the packet 688 * must be discarded, else it may be accepted below. 689 * 690 * (The IP ident field is put in the same byte order 691 * as expected when ip_mforward() is called from 692 * ip_output().) 693 */ 694 if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { 695 IP_STATINC(IP_STAT_CANTFORWARD); 696 m_freem(m); 697 return; 698 } 699 700 /* 701 * The process-level routing demon needs to receive 702 * all multicast IGMP packets, whether or not this 703 * host belongs to their destination groups. 704 */ 705 if (ip->ip_p == IPPROTO_IGMP) 706 goto ours; 707 IP_STATINC(IP_STAT_CANTFORWARD); 708 } 709 #endif 710 /* 711 * See if we belong to the destination multicast group on the 712 * arrival interface. 713 */ 714 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 715 if (inm == NULL) { 716 IP_STATINC(IP_STAT_CANTFORWARD); 717 m_freem(m); 718 return; 719 } 720 goto ours; 721 } 722 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 723 in_nullhost(ip->ip_dst)) 724 goto ours; 725 726 /* 727 * Not for us; forward if possible and desirable. 728 */ 729 if (ipforwarding == 0) { 730 IP_STATINC(IP_STAT_CANTFORWARD); 731 m_freem(m); 732 } else { 733 /* 734 * If ip_dst matched any of my address on !IFF_UP interface, 735 * and there's no IFF_UP interface that matches ip_dst, 736 * send icmp unreach. Forwarding it will result in in-kernel 737 * forwarding loop till TTL goes to 0. 738 */ 739 if (downmatch) { 740 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 741 IP_STATINC(IP_STAT_CANTFORWARD); 742 return; 743 } 744 #ifdef IPSEC 745 if (ipsec4_in_reject(m, NULL)) { 746 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 747 goto bad; 748 } 749 #endif 750 #ifdef FAST_IPSEC 751 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 752 s = splsoftnet(); 753 if (mtag != NULL) { 754 tdbi = (struct tdb_ident *)(mtag + 1); 755 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 756 } else { 757 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 758 IP_FORWARDING, &error); 759 } 760 if (sp == NULL) { /* NB: can happen if error */ 761 splx(s); 762 /*XXX error stat???*/ 763 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/ 764 goto bad; 765 } 766 767 /* 768 * Check security policy against packet attributes. 769 */ 770 error = ipsec_in_reject(sp, m); 771 KEY_FREESP(&sp); 772 splx(s); 773 if (error) { 774 IP_STATINC(IP_STAT_CANTFORWARD); 775 goto bad; 776 } 777 778 /* 779 * Peek at the outbound SP for this packet to determine if 780 * it's a Fast Forward candidate. 781 */ 782 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 783 if (mtag != NULL) 784 m->m_flags &= ~M_CANFASTFWD; 785 else { 786 s = splsoftnet(); 787 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, 788 (IP_FORWARDING | 789 (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 790 &error, NULL); 791 if (sp != NULL) { 792 m->m_flags &= ~M_CANFASTFWD; 793 KEY_FREESP(&sp); 794 } 795 splx(s); 796 } 797 #endif /* FAST_IPSEC */ 798 799 ip_forward(m, srcrt); 800 } 801 return; 802 803 ours: 804 /* 805 * If offset or IP_MF are set, must reassemble. 806 */ 807 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 808 /* 809 * Pass to IP reassembly mechanism. 810 */ 811 if (ip_reass_packet(&m, ip) != 0) { 812 /* Failed; invalid fragment(s) or packet. */ 813 goto bad; 814 } 815 if (m == NULL) { 816 /* More fragments should come; silently return. */ 817 return; 818 } 819 /* 820 * Reassembly is done, we have the final packet. 821 * Updated cached data in local variable(s). 822 */ 823 ip = mtod(m, struct ip *); 824 hlen = ip->ip_hl << 2; 825 } 826 827 #if defined(IPSEC) 828 /* 829 * enforce IPsec policy checking if we are seeing last header. 830 * note that we do not visit this with protocols with pcb layer 831 * code - like udp/tcp/raw ip. 832 */ 833 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 && 834 ipsec4_in_reject(m, NULL)) { 835 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 836 goto bad; 837 } 838 #endif 839 #ifdef FAST_IPSEC 840 /* 841 * enforce IPsec policy checking if we are seeing last header. 842 * note that we do not visit this with protocols with pcb layer 843 * code - like udp/tcp/raw ip. 844 */ 845 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { 846 /* 847 * Check if the packet has already had IPsec processing 848 * done. If so, then just pass it along. This tag gets 849 * set during AH, ESP, etc. input handling, before the 850 * packet is returned to the ip input queue for delivery. 851 */ 852 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 853 s = splsoftnet(); 854 if (mtag != NULL) { 855 tdbi = (struct tdb_ident *)(mtag + 1); 856 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 857 } else { 858 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 859 IP_FORWARDING, &error); 860 } 861 if (sp != NULL) { 862 /* 863 * Check security policy against packet attributes. 864 */ 865 error = ipsec_in_reject(sp, m); 866 KEY_FREESP(&sp); 867 } else { 868 /* XXX error stat??? */ 869 error = EINVAL; 870 DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/ 871 } 872 splx(s); 873 if (error) 874 goto bad; 875 } 876 #endif /* FAST_IPSEC */ 877 878 /* 879 * Switch out to protocol's input routine. 880 */ 881 #if IFA_STATS 882 if (ia && ip) 883 ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 884 #endif 885 IP_STATINC(IP_STAT_DELIVERED); 886 { 887 int off = hlen, nh = ip->ip_p; 888 889 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 890 return; 891 } 892 bad: 893 m_freem(m); 894 return; 895 896 badcsum: 897 IP_STATINC(IP_STAT_BADSUM); 898 m_freem(m); 899 } 900 901 /* 902 * IP timer processing. 903 */ 904 void 905 ip_slowtimo(void) 906 { 907 908 mutex_enter(softnet_lock); 909 KERNEL_LOCK(1, NULL); 910 911 ip_reass_slowtimo(); 912 913 KERNEL_UNLOCK_ONE(NULL); 914 mutex_exit(softnet_lock); 915 } 916 917 /* 918 * IP drain processing. 919 */ 920 void 921 ip_drain(void) 922 { 923 924 KERNEL_LOCK(1, NULL); 925 ip_reass_drain(); 926 KERNEL_UNLOCK_ONE(NULL); 927 } 928 929 /* 930 * Do option processing on a datagram, 931 * possibly discarding it if bad options are encountered, 932 * or forwarding it if source-routed. 933 * Returns 1 if packet has been forwarded/freed, 934 * 0 if the packet should be processed further. 935 */ 936 int 937 ip_dooptions(struct mbuf *m) 938 { 939 struct ip *ip = mtod(m, struct ip *); 940 u_char *cp, *cp0; 941 struct ip_timestamp *ipt; 942 struct in_ifaddr *ia; 943 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 944 struct in_addr dst; 945 n_time ntime; 946 947 dst = ip->ip_dst; 948 cp = (u_char *)(ip + 1); 949 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 950 for (; cnt > 0; cnt -= optlen, cp += optlen) { 951 opt = cp[IPOPT_OPTVAL]; 952 if (opt == IPOPT_EOL) 953 break; 954 if (opt == IPOPT_NOP) 955 optlen = 1; 956 else { 957 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 958 code = &cp[IPOPT_OLEN] - (u_char *)ip; 959 goto bad; 960 } 961 optlen = cp[IPOPT_OLEN]; 962 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 963 code = &cp[IPOPT_OLEN] - (u_char *)ip; 964 goto bad; 965 } 966 } 967 switch (opt) { 968 969 default: 970 break; 971 972 /* 973 * Source routing with record. 974 * Find interface with current destination address. 975 * If none on this machine then drop if strictly routed, 976 * or do nothing if loosely routed. 977 * Record interface address and bring up next address 978 * component. If strictly routed make sure next 979 * address is on directly accessible net. 980 */ 981 case IPOPT_LSRR: 982 case IPOPT_SSRR: 983 if (ip_allowsrcrt == 0) { 984 type = ICMP_UNREACH; 985 code = ICMP_UNREACH_NET_PROHIB; 986 goto bad; 987 } 988 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 989 code = &cp[IPOPT_OLEN] - (u_char *)ip; 990 goto bad; 991 } 992 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 993 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 994 goto bad; 995 } 996 ipaddr.sin_addr = ip->ip_dst; 997 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 998 if (ia == 0) { 999 if (opt == IPOPT_SSRR) { 1000 type = ICMP_UNREACH; 1001 code = ICMP_UNREACH_SRCFAIL; 1002 goto bad; 1003 } 1004 /* 1005 * Loose routing, and not at next destination 1006 * yet; nothing to do except forward. 1007 */ 1008 break; 1009 } 1010 off--; /* 0 origin */ 1011 if ((off + sizeof(struct in_addr)) > optlen) { 1012 /* 1013 * End of source route. Should be for us. 1014 */ 1015 save_rte(cp, ip->ip_src); 1016 break; 1017 } 1018 /* 1019 * locate outgoing interface 1020 */ 1021 memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), 1022 sizeof(ipaddr.sin_addr)); 1023 if (opt == IPOPT_SSRR) 1024 ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr))); 1025 else 1026 ia = ip_rtaddr(ipaddr.sin_addr); 1027 if (ia == 0) { 1028 type = ICMP_UNREACH; 1029 code = ICMP_UNREACH_SRCFAIL; 1030 goto bad; 1031 } 1032 ip->ip_dst = ipaddr.sin_addr; 1033 bcopy((void *)&ia->ia_addr.sin_addr, 1034 (void *)(cp + off), sizeof(struct in_addr)); 1035 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1036 /* 1037 * Let ip_intr's mcast routing check handle mcast pkts 1038 */ 1039 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 1040 break; 1041 1042 case IPOPT_RR: 1043 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1044 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1045 goto bad; 1046 } 1047 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1048 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1049 goto bad; 1050 } 1051 /* 1052 * If no space remains, ignore. 1053 */ 1054 off--; /* 0 origin */ 1055 if ((off + sizeof(struct in_addr)) > optlen) 1056 break; 1057 memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst), 1058 sizeof(ipaddr.sin_addr)); 1059 /* 1060 * locate outgoing interface; if we're the destination, 1061 * use the incoming interface (should be same). 1062 */ 1063 if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))) 1064 == NULL && 1065 (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) { 1066 type = ICMP_UNREACH; 1067 code = ICMP_UNREACH_HOST; 1068 goto bad; 1069 } 1070 bcopy((void *)&ia->ia_addr.sin_addr, 1071 (void *)(cp + off), sizeof(struct in_addr)); 1072 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1073 break; 1074 1075 case IPOPT_TS: 1076 code = cp - (u_char *)ip; 1077 ipt = (struct ip_timestamp *)cp; 1078 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1079 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1080 goto bad; 1081 } 1082 if (ipt->ipt_ptr < 5) { 1083 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1084 goto bad; 1085 } 1086 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 1087 if (++ipt->ipt_oflw == 0) { 1088 code = (u_char *)&ipt->ipt_ptr - 1089 (u_char *)ip; 1090 goto bad; 1091 } 1092 break; 1093 } 1094 cp0 = (cp + ipt->ipt_ptr - 1); 1095 switch (ipt->ipt_flg) { 1096 1097 case IPOPT_TS_TSONLY: 1098 break; 1099 1100 case IPOPT_TS_TSANDADDR: 1101 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1102 sizeof(struct in_addr) > ipt->ipt_len) { 1103 code = (u_char *)&ipt->ipt_ptr - 1104 (u_char *)ip; 1105 goto bad; 1106 } 1107 ipaddr.sin_addr = dst; 1108 ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr), 1109 m->m_pkthdr.rcvif)); 1110 if (ia == 0) 1111 continue; 1112 bcopy(&ia->ia_addr.sin_addr, 1113 cp0, sizeof(struct in_addr)); 1114 ipt->ipt_ptr += sizeof(struct in_addr); 1115 break; 1116 1117 case IPOPT_TS_PRESPEC: 1118 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1119 sizeof(struct in_addr) > ipt->ipt_len) { 1120 code = (u_char *)&ipt->ipt_ptr - 1121 (u_char *)ip; 1122 goto bad; 1123 } 1124 memcpy(&ipaddr.sin_addr, cp0, 1125 sizeof(struct in_addr)); 1126 if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))) 1127 == NULL) 1128 continue; 1129 ipt->ipt_ptr += sizeof(struct in_addr); 1130 break; 1131 1132 default: 1133 /* XXX can't take &ipt->ipt_flg */ 1134 code = (u_char *)&ipt->ipt_ptr - 1135 (u_char *)ip + 1; 1136 goto bad; 1137 } 1138 ntime = iptime(); 1139 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1140 memmove((char *)cp + ipt->ipt_ptr - 1, cp0, 1141 sizeof(n_time)); 1142 ipt->ipt_ptr += sizeof(n_time); 1143 } 1144 } 1145 if (forward) { 1146 if (ip_forwsrcrt == 0) { 1147 type = ICMP_UNREACH; 1148 code = ICMP_UNREACH_SRCFAIL; 1149 goto bad; 1150 } 1151 ip_forward(m, 1); 1152 return (1); 1153 } 1154 return (0); 1155 bad: 1156 icmp_error(m, type, code, 0, 0); 1157 IP_STATINC(IP_STAT_BADOPTIONS); 1158 return (1); 1159 } 1160 1161 /* 1162 * Given address of next destination (final or next hop), 1163 * return internet address info of interface to be used to get there. 1164 */ 1165 struct in_ifaddr * 1166 ip_rtaddr(struct in_addr dst) 1167 { 1168 struct rtentry *rt; 1169 union { 1170 struct sockaddr dst; 1171 struct sockaddr_in dst4; 1172 } u; 1173 1174 sockaddr_in_init(&u.dst4, &dst, 0); 1175 1176 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) 1177 return NULL; 1178 1179 return ifatoia(rt->rt_ifa); 1180 } 1181 1182 /* 1183 * Save incoming source route for use in replies, 1184 * to be picked up later by ip_srcroute if the receiver is interested. 1185 */ 1186 void 1187 save_rte(u_char *option, struct in_addr dst) 1188 { 1189 unsigned olen; 1190 1191 olen = option[IPOPT_OLEN]; 1192 #ifdef DIAGNOSTIC 1193 if (ipprintfs) 1194 printf("save_rte: olen %d\n", olen); 1195 #endif /* 0 */ 1196 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1197 return; 1198 memcpy((void *)ip_srcrt.srcopt, (void *)option, olen); 1199 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1200 ip_srcrt.dst = dst; 1201 } 1202 1203 /* 1204 * Retrieve incoming source route for use in replies, 1205 * in the same form used by setsockopt. 1206 * The first hop is placed before the options, will be removed later. 1207 */ 1208 struct mbuf * 1209 ip_srcroute(void) 1210 { 1211 struct in_addr *p, *q; 1212 struct mbuf *m; 1213 1214 if (ip_nhops == 0) 1215 return NULL; 1216 m = m_get(M_DONTWAIT, MT_SOOPTS); 1217 if (m == 0) 1218 return NULL; 1219 1220 MCLAIM(m, &inetdomain.dom_mowner); 1221 #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1222 1223 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1224 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1225 OPTSIZ; 1226 #ifdef DIAGNOSTIC 1227 if (ipprintfs) 1228 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1229 #endif 1230 1231 /* 1232 * First save first hop for return route 1233 */ 1234 p = &ip_srcrt.route[ip_nhops - 1]; 1235 *(mtod(m, struct in_addr *)) = *p--; 1236 #ifdef DIAGNOSTIC 1237 if (ipprintfs) 1238 printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr)); 1239 #endif 1240 1241 /* 1242 * Copy option fields and padding (nop) to mbuf. 1243 */ 1244 ip_srcrt.nop = IPOPT_NOP; 1245 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1246 memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop, 1247 OPTSIZ); 1248 q = (struct in_addr *)(mtod(m, char *) + 1249 sizeof(struct in_addr) + OPTSIZ); 1250 #undef OPTSIZ 1251 /* 1252 * Record return path as an IP source route, 1253 * reversing the path (pointers are now aligned). 1254 */ 1255 while (p >= ip_srcrt.route) { 1256 #ifdef DIAGNOSTIC 1257 if (ipprintfs) 1258 printf(" %x", ntohl(q->s_addr)); 1259 #endif 1260 *q++ = *p--; 1261 } 1262 /* 1263 * Last hop goes to final destination. 1264 */ 1265 *q = ip_srcrt.dst; 1266 #ifdef DIAGNOSTIC 1267 if (ipprintfs) 1268 printf(" %x\n", ntohl(q->s_addr)); 1269 #endif 1270 return (m); 1271 } 1272 1273 const int inetctlerrmap[PRC_NCMDS] = { 1274 [PRC_MSGSIZE] = EMSGSIZE, 1275 [PRC_HOSTDEAD] = EHOSTDOWN, 1276 [PRC_HOSTUNREACH] = EHOSTUNREACH, 1277 [PRC_UNREACH_NET] = EHOSTUNREACH, 1278 [PRC_UNREACH_HOST] = EHOSTUNREACH, 1279 [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, 1280 [PRC_UNREACH_PORT] = ECONNREFUSED, 1281 [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, 1282 [PRC_PARAMPROB] = ENOPROTOOPT, 1283 }; 1284 1285 /* 1286 * Forward a packet. If some error occurs return the sender 1287 * an icmp packet. Note we can't always generate a meaningful 1288 * icmp message because icmp doesn't have a large enough repertoire 1289 * of codes and types. 1290 * 1291 * If not forwarding, just drop the packet. This could be confusing 1292 * if ipforwarding was zero but some routing protocol was advancing 1293 * us as a gateway to somewhere. However, we must let the routing 1294 * protocol deal with that. 1295 * 1296 * The srcrt parameter indicates whether the packet is being forwarded 1297 * via a source route. 1298 */ 1299 void 1300 ip_forward(struct mbuf *m, int srcrt) 1301 { 1302 struct ip *ip = mtod(m, struct ip *); 1303 struct rtentry *rt; 1304 int error, type = 0, code = 0, destmtu = 0; 1305 struct mbuf *mcopy; 1306 n_long dest; 1307 union { 1308 struct sockaddr dst; 1309 struct sockaddr_in dst4; 1310 } u; 1311 1312 /* 1313 * We are now in the output path. 1314 */ 1315 MCLAIM(m, &ip_tx_mowner); 1316 1317 /* 1318 * Clear any in-bound checksum flags for this packet. 1319 */ 1320 m->m_pkthdr.csum_flags = 0; 1321 1322 dest = 0; 1323 #ifdef DIAGNOSTIC 1324 if (ipprintfs) { 1325 printf("forward: src %s ", inet_ntoa(ip->ip_src)); 1326 printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl); 1327 } 1328 #endif 1329 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1330 IP_STATINC(IP_STAT_CANTFORWARD); 1331 m_freem(m); 1332 return; 1333 } 1334 if (ip->ip_ttl <= IPTTLDEC) { 1335 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1336 return; 1337 } 1338 1339 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1340 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) { 1341 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); 1342 return; 1343 } 1344 1345 /* 1346 * Save at most 68 bytes of the packet in case 1347 * we need to generate an ICMP message to the src. 1348 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1349 */ 1350 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1351 if (mcopy) 1352 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1353 1354 ip->ip_ttl -= IPTTLDEC; 1355 1356 /* 1357 * If forwarding packet using same interface that it came in on, 1358 * perhaps should send a redirect to sender to shortcut a hop. 1359 * Only send redirect if source is sending directly to us, 1360 * and if packet was not source routed (or has any options). 1361 * Also, don't send redirect if forwarding using a default route 1362 * or a route modified by a redirect. 1363 */ 1364 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1365 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1366 !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && 1367 ipsendredirects && !srcrt) { 1368 if (rt->rt_ifa && 1369 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1370 ifatoia(rt->rt_ifa)->ia_subnet) { 1371 if (rt->rt_flags & RTF_GATEWAY) 1372 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1373 else 1374 dest = ip->ip_dst.s_addr; 1375 /* 1376 * Router requirements says to only send host 1377 * redirects. 1378 */ 1379 type = ICMP_REDIRECT; 1380 code = ICMP_REDIRECT_HOST; 1381 #ifdef DIAGNOSTIC 1382 if (ipprintfs) 1383 printf("redirect (%d) to %x\n", code, 1384 (u_int32_t)dest); 1385 #endif 1386 } 1387 } 1388 1389 error = ip_output(m, NULL, &ipforward_rt, 1390 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 1391 (struct ip_moptions *)NULL, (struct socket *)NULL); 1392 1393 if (error) 1394 IP_STATINC(IP_STAT_CANTFORWARD); 1395 else { 1396 uint64_t *ips = IP_STAT_GETREF(); 1397 ips[IP_STAT_FORWARD]++; 1398 if (type) { 1399 ips[IP_STAT_REDIRECTSENT]++; 1400 IP_STAT_PUTREF(); 1401 } else { 1402 IP_STAT_PUTREF(); 1403 if (mcopy) { 1404 #ifdef GATEWAY 1405 if (mcopy->m_flags & M_CANFASTFWD) 1406 ipflow_create(&ipforward_rt, mcopy); 1407 #endif 1408 m_freem(mcopy); 1409 } 1410 return; 1411 } 1412 } 1413 if (mcopy == NULL) 1414 return; 1415 1416 switch (error) { 1417 1418 case 0: /* forwarded, but need redirect */ 1419 /* type, code set above */ 1420 break; 1421 1422 case ENETUNREACH: /* shouldn't happen, checked above */ 1423 case EHOSTUNREACH: 1424 case ENETDOWN: 1425 case EHOSTDOWN: 1426 default: 1427 type = ICMP_UNREACH; 1428 code = ICMP_UNREACH_HOST; 1429 break; 1430 1431 case EMSGSIZE: 1432 type = ICMP_UNREACH; 1433 code = ICMP_UNREACH_NEEDFRAG; 1434 1435 if ((rt = rtcache_validate(&ipforward_rt)) != NULL) 1436 destmtu = rt->rt_ifp->if_mtu; 1437 1438 #if defined(IPSEC) || defined(FAST_IPSEC) 1439 { 1440 /* 1441 * If the packet is routed over IPsec tunnel, tell the 1442 * originator the tunnel MTU. 1443 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 1444 * XXX quickhack!!! 1445 */ 1446 1447 struct secpolicy *sp; 1448 int ipsecerror; 1449 size_t ipsechdr; 1450 struct route *ro; 1451 1452 sp = ipsec4_getpolicybyaddr(mcopy, 1453 IPSEC_DIR_OUTBOUND, IP_FORWARDING, 1454 &ipsecerror); 1455 1456 if (sp != NULL) { 1457 /* count IPsec header size */ 1458 ipsechdr = ipsec4_hdrsiz(mcopy, 1459 IPSEC_DIR_OUTBOUND, NULL); 1460 1461 /* 1462 * find the correct route for outer IPv4 1463 * header, compute tunnel MTU. 1464 */ 1465 1466 if (sp->req != NULL 1467 && sp->req->sav != NULL 1468 && sp->req->sav->sah != NULL) { 1469 ro = &sp->req->sav->sah->sa_route; 1470 rt = rtcache_validate(ro); 1471 if (rt && rt->rt_ifp) { 1472 destmtu = 1473 rt->rt_rmx.rmx_mtu ? 1474 rt->rt_rmx.rmx_mtu : 1475 rt->rt_ifp->if_mtu; 1476 destmtu -= ipsechdr; 1477 } 1478 } 1479 1480 #ifdef IPSEC 1481 key_freesp(sp); 1482 #else 1483 KEY_FREESP(&sp); 1484 #endif 1485 } 1486 } 1487 #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/ 1488 IP_STATINC(IP_STAT_CANTFRAG); 1489 break; 1490 1491 case ENOBUFS: 1492 #if 1 1493 /* 1494 * a router should not generate ICMP_SOURCEQUENCH as 1495 * required in RFC1812 Requirements for IP Version 4 Routers. 1496 * source quench could be a big problem under DoS attacks, 1497 * or if the underlying interface is rate-limited. 1498 */ 1499 if (mcopy) 1500 m_freem(mcopy); 1501 return; 1502 #else 1503 type = ICMP_SOURCEQUENCH; 1504 code = 0; 1505 break; 1506 #endif 1507 } 1508 icmp_error(mcopy, type, code, dest, destmtu); 1509 } 1510 1511 void 1512 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1513 struct mbuf *m) 1514 { 1515 1516 if (inp->inp_socket->so_options & SO_TIMESTAMP 1517 #ifdef SO_OTIMESTAMP 1518 || inp->inp_socket->so_options & SO_OTIMESTAMP 1519 #endif 1520 ) { 1521 struct timeval tv; 1522 1523 microtime(&tv); 1524 #ifdef SO_OTIMESTAMP 1525 if (inp->inp_socket->so_options & SO_OTIMESTAMP) { 1526 struct timeval50 tv50; 1527 timeval_to_timeval50(&tv, &tv50); 1528 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1529 SCM_OTIMESTAMP, SOL_SOCKET); 1530 } else 1531 #endif 1532 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1533 SCM_TIMESTAMP, SOL_SOCKET); 1534 if (*mp) 1535 mp = &(*mp)->m_next; 1536 } 1537 if (inp->inp_flags & INP_RECVDSTADDR) { 1538 *mp = sbcreatecontrol((void *) &ip->ip_dst, 1539 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1540 if (*mp) 1541 mp = &(*mp)->m_next; 1542 } 1543 #ifdef notyet 1544 /* 1545 * XXX 1546 * Moving these out of udp_input() made them even more broken 1547 * than they already were. 1548 * - fenner@parc.xerox.com 1549 */ 1550 /* options were tossed already */ 1551 if (inp->inp_flags & INP_RECVOPTS) { 1552 *mp = sbcreatecontrol((void *) opts_deleted_above, 1553 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1554 if (*mp) 1555 mp = &(*mp)->m_next; 1556 } 1557 /* ip_srcroute doesn't do what we want here, need to fix */ 1558 if (inp->inp_flags & INP_RECVRETOPTS) { 1559 *mp = sbcreatecontrol((void *) ip_srcroute(), 1560 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1561 if (*mp) 1562 mp = &(*mp)->m_next; 1563 } 1564 #endif 1565 if (inp->inp_flags & INP_RECVIF) { 1566 struct sockaddr_dl sdl; 1567 1568 sockaddr_dl_init(&sdl, sizeof(sdl), 1569 (m->m_pkthdr.rcvif != NULL) 1570 ? m->m_pkthdr.rcvif->if_index 1571 : 0, 1572 0, NULL, 0, NULL, 0); 1573 *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); 1574 if (*mp) 1575 mp = &(*mp)->m_next; 1576 } 1577 if (inp->inp_flags & INP_RECVTTL) { 1578 *mp = sbcreatecontrol((void *) &ip->ip_ttl, 1579 sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); 1580 if (*mp) 1581 mp = &(*mp)->m_next; 1582 } 1583 } 1584 1585 /* 1586 * sysctl helper routine for net.inet.ip.forwsrcrt. 1587 */ 1588 static int 1589 sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) 1590 { 1591 int error, tmp; 1592 struct sysctlnode node; 1593 1594 node = *rnode; 1595 tmp = ip_forwsrcrt; 1596 node.sysctl_data = &tmp; 1597 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1598 if (error || newp == NULL) 1599 return (error); 1600 1601 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, 1602 0, NULL, NULL, NULL); 1603 if (error) 1604 return (error); 1605 1606 ip_forwsrcrt = tmp; 1607 1608 return (0); 1609 } 1610 1611 /* 1612 * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the 1613 * range of the new value and tweaks timers if it changes. 1614 */ 1615 static int 1616 sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) 1617 { 1618 int error, tmp; 1619 struct sysctlnode node; 1620 1621 node = *rnode; 1622 tmp = ip_mtudisc_timeout; 1623 node.sysctl_data = &tmp; 1624 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1625 if (error || newp == NULL) 1626 return (error); 1627 if (tmp < 0) 1628 return (EINVAL); 1629 1630 mutex_enter(softnet_lock); 1631 1632 ip_mtudisc_timeout = tmp; 1633 rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); 1634 1635 mutex_exit(softnet_lock); 1636 1637 return (0); 1638 } 1639 1640 #ifdef GATEWAY 1641 /* 1642 * sysctl helper routine for net.inet.ip.maxflows. 1643 */ 1644 static int 1645 sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS) 1646 { 1647 int error; 1648 1649 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1650 if (error || newp == NULL) 1651 return (error); 1652 1653 mutex_enter(softnet_lock); 1654 KERNEL_LOCK(1, NULL); 1655 1656 ipflow_prune(); 1657 1658 KERNEL_UNLOCK_ONE(NULL); 1659 mutex_exit(softnet_lock); 1660 1661 return (0); 1662 } 1663 1664 static int 1665 sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS) 1666 { 1667 int error, tmp; 1668 struct sysctlnode node; 1669 1670 node = *rnode; 1671 tmp = ip_hashsize; 1672 node.sysctl_data = &tmp; 1673 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1674 if (error || newp == NULL) 1675 return (error); 1676 1677 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1678 /* 1679 * Can only fail due to malloc() 1680 */ 1681 mutex_enter(softnet_lock); 1682 KERNEL_LOCK(1, NULL); 1683 1684 error = ipflow_invalidate_all(tmp); 1685 1686 KERNEL_UNLOCK_ONE(NULL); 1687 mutex_exit(softnet_lock); 1688 1689 } else { 1690 /* 1691 * EINVAL if not a power of 2 1692 */ 1693 error = EINVAL; 1694 } 1695 1696 return error; 1697 } 1698 #endif /* GATEWAY */ 1699 1700 static int 1701 sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) 1702 { 1703 1704 return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); 1705 } 1706 1707 static void 1708 sysctl_net_inet_ip_setup(struct sysctllog **clog) 1709 { 1710 extern int subnetsarelocal, hostzeroisbroadcast; 1711 1712 sysctl_createv(clog, 0, NULL, NULL, 1713 CTLFLAG_PERMANENT, 1714 CTLTYPE_NODE, "net", NULL, 1715 NULL, 0, NULL, 0, 1716 CTL_NET, CTL_EOL); 1717 sysctl_createv(clog, 0, NULL, NULL, 1718 CTLFLAG_PERMANENT, 1719 CTLTYPE_NODE, "inet", 1720 SYSCTL_DESCR("PF_INET related settings"), 1721 NULL, 0, NULL, 0, 1722 CTL_NET, PF_INET, CTL_EOL); 1723 sysctl_createv(clog, 0, NULL, NULL, 1724 CTLFLAG_PERMANENT, 1725 CTLTYPE_NODE, "ip", 1726 SYSCTL_DESCR("IPv4 related settings"), 1727 NULL, 0, NULL, 0, 1728 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 1729 1730 sysctl_createv(clog, 0, NULL, NULL, 1731 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1732 CTLTYPE_INT, "forwarding", 1733 SYSCTL_DESCR("Enable forwarding of INET datagrams"), 1734 NULL, 0, &ipforwarding, 0, 1735 CTL_NET, PF_INET, IPPROTO_IP, 1736 IPCTL_FORWARDING, CTL_EOL); 1737 sysctl_createv(clog, 0, NULL, NULL, 1738 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1739 CTLTYPE_INT, "redirect", 1740 SYSCTL_DESCR("Enable sending of ICMP redirect messages"), 1741 NULL, 0, &ipsendredirects, 0, 1742 CTL_NET, PF_INET, IPPROTO_IP, 1743 IPCTL_SENDREDIRECTS, CTL_EOL); 1744 sysctl_createv(clog, 0, NULL, NULL, 1745 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1746 CTLTYPE_INT, "ttl", 1747 SYSCTL_DESCR("Default TTL for an INET datagram"), 1748 NULL, 0, &ip_defttl, 0, 1749 CTL_NET, PF_INET, IPPROTO_IP, 1750 IPCTL_DEFTTL, CTL_EOL); 1751 #ifdef IPCTL_DEFMTU 1752 sysctl_createv(clog, 0, NULL, NULL, 1753 CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */, 1754 CTLTYPE_INT, "mtu", 1755 SYSCTL_DESCR("Default MTA for an INET route"), 1756 NULL, 0, &ip_mtu, 0, 1757 CTL_NET, PF_INET, IPPROTO_IP, 1758 IPCTL_DEFMTU, CTL_EOL); 1759 #endif /* IPCTL_DEFMTU */ 1760 sysctl_createv(clog, 0, NULL, NULL, 1761 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1762 CTLTYPE_INT, "forwsrcrt", 1763 SYSCTL_DESCR("Enable forwarding of source-routed " 1764 "datagrams"), 1765 sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, 1766 CTL_NET, PF_INET, IPPROTO_IP, 1767 IPCTL_FORWSRCRT, CTL_EOL); 1768 sysctl_createv(clog, 0, NULL, NULL, 1769 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1770 CTLTYPE_INT, "directed-broadcast", 1771 SYSCTL_DESCR("Enable forwarding of broadcast datagrams"), 1772 NULL, 0, &ip_directedbcast, 0, 1773 CTL_NET, PF_INET, IPPROTO_IP, 1774 IPCTL_DIRECTEDBCAST, CTL_EOL); 1775 sysctl_createv(clog, 0, NULL, NULL, 1776 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1777 CTLTYPE_INT, "allowsrcrt", 1778 SYSCTL_DESCR("Accept source-routed datagrams"), 1779 NULL, 0, &ip_allowsrcrt, 0, 1780 CTL_NET, PF_INET, IPPROTO_IP, 1781 IPCTL_ALLOWSRCRT, CTL_EOL); 1782 sysctl_createv(clog, 0, NULL, NULL, 1783 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1784 CTLTYPE_INT, "subnetsarelocal", 1785 SYSCTL_DESCR("Whether logical subnets are considered " 1786 "local"), 1787 NULL, 0, &subnetsarelocal, 0, 1788 CTL_NET, PF_INET, IPPROTO_IP, 1789 IPCTL_SUBNETSARELOCAL, CTL_EOL); 1790 sysctl_createv(clog, 0, NULL, NULL, 1791 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1792 CTLTYPE_INT, "mtudisc", 1793 SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"), 1794 NULL, 0, &ip_mtudisc, 0, 1795 CTL_NET, PF_INET, IPPROTO_IP, 1796 IPCTL_MTUDISC, CTL_EOL); 1797 sysctl_createv(clog, 0, NULL, NULL, 1798 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1799 CTLTYPE_INT, "anonportmin", 1800 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1801 sysctl_net_inet_ip_ports, 0, &anonportmin, 0, 1802 CTL_NET, PF_INET, IPPROTO_IP, 1803 IPCTL_ANONPORTMIN, CTL_EOL); 1804 sysctl_createv(clog, 0, NULL, NULL, 1805 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1806 CTLTYPE_INT, "anonportmax", 1807 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1808 sysctl_net_inet_ip_ports, 0, &anonportmax, 0, 1809 CTL_NET, PF_INET, IPPROTO_IP, 1810 IPCTL_ANONPORTMAX, CTL_EOL); 1811 sysctl_createv(clog, 0, NULL, NULL, 1812 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1813 CTLTYPE_INT, "mtudisctimeout", 1814 SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"), 1815 sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0, 1816 CTL_NET, PF_INET, IPPROTO_IP, 1817 IPCTL_MTUDISCTIMEOUT, CTL_EOL); 1818 #ifdef GATEWAY 1819 sysctl_createv(clog, 0, NULL, NULL, 1820 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1821 CTLTYPE_INT, "maxflows", 1822 SYSCTL_DESCR("Number of flows for fast forwarding"), 1823 sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0, 1824 CTL_NET, PF_INET, IPPROTO_IP, 1825 IPCTL_MAXFLOWS, CTL_EOL); 1826 sysctl_createv(clog, 0, NULL, NULL, 1827 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1828 CTLTYPE_INT, "hashsize", 1829 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"), 1830 sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0, 1831 CTL_NET, PF_INET, IPPROTO_IP, 1832 CTL_CREATE, CTL_EOL); 1833 #endif /* GATEWAY */ 1834 sysctl_createv(clog, 0, NULL, NULL, 1835 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1836 CTLTYPE_INT, "hostzerobroadcast", 1837 SYSCTL_DESCR("All zeroes address is broadcast address"), 1838 NULL, 0, &hostzeroisbroadcast, 0, 1839 CTL_NET, PF_INET, IPPROTO_IP, 1840 IPCTL_HOSTZEROBROADCAST, CTL_EOL); 1841 #if NGIF > 0 1842 sysctl_createv(clog, 0, NULL, NULL, 1843 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1844 CTLTYPE_INT, "gifttl", 1845 SYSCTL_DESCR("Default TTL for a gif tunnel datagram"), 1846 NULL, 0, &ip_gif_ttl, 0, 1847 CTL_NET, PF_INET, IPPROTO_IP, 1848 IPCTL_GIF_TTL, CTL_EOL); 1849 #endif /* NGIF */ 1850 #ifndef IPNOPRIVPORTS 1851 sysctl_createv(clog, 0, NULL, NULL, 1852 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1853 CTLTYPE_INT, "lowportmin", 1854 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1855 "to assign"), 1856 sysctl_net_inet_ip_ports, 0, &lowportmin, 0, 1857 CTL_NET, PF_INET, IPPROTO_IP, 1858 IPCTL_LOWPORTMIN, CTL_EOL); 1859 sysctl_createv(clog, 0, NULL, NULL, 1860 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1861 CTLTYPE_INT, "lowportmax", 1862 SYSCTL_DESCR("Highest privileged ephemeral port number " 1863 "to assign"), 1864 sysctl_net_inet_ip_ports, 0, &lowportmax, 0, 1865 CTL_NET, PF_INET, IPPROTO_IP, 1866 IPCTL_LOWPORTMAX, CTL_EOL); 1867 #endif /* IPNOPRIVPORTS */ 1868 #if NGRE > 0 1869 sysctl_createv(clog, 0, NULL, NULL, 1870 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1871 CTLTYPE_INT, "grettl", 1872 SYSCTL_DESCR("Default TTL for a gre tunnel datagram"), 1873 NULL, 0, &ip_gre_ttl, 0, 1874 CTL_NET, PF_INET, IPPROTO_IP, 1875 IPCTL_GRE_TTL, CTL_EOL); 1876 #endif /* NGRE */ 1877 sysctl_createv(clog, 0, NULL, NULL, 1878 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1879 CTLTYPE_INT, "checkinterface", 1880 SYSCTL_DESCR("Enable receive side of Strong ES model " 1881 "from RFC1122"), 1882 NULL, 0, &ip_checkinterface, 0, 1883 CTL_NET, PF_INET, IPPROTO_IP, 1884 IPCTL_CHECKINTERFACE, CTL_EOL); 1885 sysctl_createv(clog, 0, NULL, NULL, 1886 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1887 CTLTYPE_INT, "random_id", 1888 SYSCTL_DESCR("Assign random ip_id values"), 1889 NULL, 0, &ip_do_randomid, 0, 1890 CTL_NET, PF_INET, IPPROTO_IP, 1891 IPCTL_RANDOMID, CTL_EOL); 1892 sysctl_createv(clog, 0, NULL, NULL, 1893 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1894 CTLTYPE_INT, "do_loopback_cksum", 1895 SYSCTL_DESCR("Perform IP checksum on loopback"), 1896 NULL, 0, &ip_do_loopback_cksum, 0, 1897 CTL_NET, PF_INET, IPPROTO_IP, 1898 IPCTL_LOOPBACKCKSUM, CTL_EOL); 1899 sysctl_createv(clog, 0, NULL, NULL, 1900 CTLFLAG_PERMANENT, 1901 CTLTYPE_STRUCT, "stats", 1902 SYSCTL_DESCR("IP statistics"), 1903 sysctl_net_inet_ip_stats, 0, NULL, 0, 1904 CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, 1905 CTL_EOL); 1906 } 1907 1908 void 1909 ip_statinc(u_int stat) 1910 { 1911 1912 KASSERT(stat < IP_NSTATS); 1913 IP_STATINC(stat); 1914 } 1915