1 /* $NetBSD: ip_input.c,v 1.299 2012/03/22 20:34:39 drochner 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 1.299 2012/03/22 20:34:39 drochner 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 FAST_IPSEC 144 #include <netipsec/ipsec.h> 145 #include <netipsec/key.h> 146 #endif /* FAST_IPSEC*/ 147 148 #ifndef IPFORWARDING 149 #ifdef GATEWAY 150 #define IPFORWARDING 1 /* forward IP packets not for us */ 151 #else /* GATEWAY */ 152 #define IPFORWARDING 0 /* don't forward IP packets not for us */ 153 #endif /* GATEWAY */ 154 #endif /* IPFORWARDING */ 155 #ifndef IPSENDREDIRECTS 156 #define IPSENDREDIRECTS 1 157 #endif 158 #ifndef IPFORWSRCRT 159 #define IPFORWSRCRT 1 /* forward source-routed packets */ 160 #endif 161 #ifndef IPALLOWSRCRT 162 #define IPALLOWSRCRT 1 /* allow source-routed packets */ 163 #endif 164 #ifndef IPMTUDISC 165 #define IPMTUDISC 1 166 #endif 167 #ifndef IPMTUDISCTIMEOUT 168 #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 169 #endif 170 171 #ifdef COMPAT_50 172 #include <compat/sys/time.h> 173 #include <compat/sys/socket.h> 174 #endif 175 176 /* 177 * Note: DIRECTED_BROADCAST is handled this way so that previous 178 * configuration using this option will Just Work. 179 */ 180 #ifndef IPDIRECTEDBCAST 181 #ifdef DIRECTED_BROADCAST 182 #define IPDIRECTEDBCAST 1 183 #else 184 #define IPDIRECTEDBCAST 0 185 #endif /* DIRECTED_BROADCAST */ 186 #endif /* IPDIRECTEDBCAST */ 187 int ipforwarding = IPFORWARDING; 188 int ipsendredirects = IPSENDREDIRECTS; 189 int ip_defttl = IPDEFTTL; 190 int ip_forwsrcrt = IPFORWSRCRT; 191 int ip_directedbcast = IPDIRECTEDBCAST; 192 int ip_allowsrcrt = IPALLOWSRCRT; 193 int ip_mtudisc = IPMTUDISC; 194 int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; 195 #ifdef DIAGNOSTIC 196 int ipprintfs = 0; 197 #endif 198 199 int ip_do_randomid = 0; 200 201 /* 202 * XXX - Setting ip_checkinterface mostly implements the receive side of 203 * the Strong ES model described in RFC 1122, but since the routing table 204 * and transmit implementation do not implement the Strong ES model, 205 * setting this to 1 results in an odd hybrid. 206 * 207 * XXX - ip_checkinterface currently must be disabled if you use ipnat 208 * to translate the destination address to another local interface. 209 * 210 * XXX - ip_checkinterface must be disabled if you add IP aliases 211 * to the loopback interface instead of the interface where the 212 * packets for those addresses are received. 213 */ 214 int ip_checkinterface = 0; 215 216 217 struct rttimer_queue *ip_mtudisc_timeout_q = NULL; 218 219 u_long in_ifaddrhash; /* size of hash table - 1 */ 220 int in_ifaddrentries; /* total number of addrs */ 221 struct in_ifaddrhead in_ifaddrhead; 222 struct in_ifaddrhashhead *in_ifaddrhashtbl; 223 u_long in_multihash; /* size of hash table - 1 */ 224 int in_multientries; /* total number of addrs */ 225 struct in_multihashhead *in_multihashtbl; 226 struct ifqueue ipintrq; 227 228 ipid_state_t * ip_ids; 229 uint16_t ip_id; 230 231 percpu_t *ipstat_percpu; 232 233 #ifdef PFIL_HOOKS 234 struct pfil_head inet_pfil_hook; 235 #endif 236 237 struct pool inmulti_pool; 238 239 #ifdef INET_CSUM_COUNTERS 240 #include <sys/device.h> 241 242 struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 243 NULL, "inet", "hwcsum bad"); 244 struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 245 NULL, "inet", "hwcsum ok"); 246 struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 247 NULL, "inet", "swcsum"); 248 249 #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 250 251 EVCNT_ATTACH_STATIC(ip_hwcsum_bad); 252 EVCNT_ATTACH_STATIC(ip_hwcsum_ok); 253 EVCNT_ATTACH_STATIC(ip_swcsum); 254 255 #else 256 257 #define INET_CSUM_COUNTER_INCR(ev) /* nothing */ 258 259 #endif /* INET_CSUM_COUNTERS */ 260 261 /* 262 * We need to save the IP options in case a protocol wants to respond 263 * to an incoming packet over the same route if the packet got here 264 * using IP source routing. This allows connection establishment and 265 * maintenance when the remote end is on a network that is not known 266 * to us. 267 */ 268 int ip_nhops = 0; 269 static struct ip_srcrt { 270 struct in_addr dst; /* final destination */ 271 char nop; /* one NOP to align */ 272 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 273 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 274 } ip_srcrt; 275 276 static int ip_drainwanted; 277 278 static void save_rte(u_char *, struct in_addr); 279 280 #ifdef MBUFTRACE 281 struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx"); 282 struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx"); 283 #endif 284 285 static void sysctl_net_inet_ip_setup(struct sysctllog **); 286 287 /* 288 * IP initialization: fill in IP protocol switch table. 289 * All protocols not implemented in kernel go to raw IP protocol handler. 290 */ 291 void 292 ip_init(void) 293 { 294 const struct protosw *pr; 295 int i; 296 297 sysctl_net_inet_ip_setup(NULL); 298 299 pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", 300 NULL, IPL_SOFTNET); 301 302 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 303 if (pr == 0) 304 panic("ip_init"); 305 for (i = 0; i < IPPROTO_MAX; i++) 306 ip_protox[i] = pr - inetsw; 307 for (pr = inetdomain.dom_protosw; 308 pr < inetdomain.dom_protoswNPROTOSW; pr++) 309 if (pr->pr_domain->dom_family == PF_INET && 310 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 311 ip_protox[pr->pr_protocol] = pr - inetsw; 312 313 ip_reass_init(); 314 315 ip_ids = ip_id_init(); 316 ip_id = time_second & 0xfffff; 317 318 ipintrq.ifq_maxlen = IFQ_MAXLEN; 319 320 TAILQ_INIT(&in_ifaddrhead); 321 in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 322 &in_ifaddrhash); 323 in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 324 &in_multihash); 325 ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); 326 #ifdef GATEWAY 327 ipflow_init(ip_hashsize); 328 #endif 329 330 #ifdef PFIL_HOOKS 331 /* Register our Packet Filter hook. */ 332 inet_pfil_hook.ph_type = PFIL_TYPE_AF; 333 inet_pfil_hook.ph_af = AF_INET; 334 i = pfil_head_register(&inet_pfil_hook); 335 if (i != 0) 336 printf("ip_init: WARNING: unable to register pfil hook, " 337 "error %d\n", i); 338 #endif /* PFIL_HOOKS */ 339 340 #ifdef MBUFTRACE 341 MOWNER_ATTACH(&ip_tx_mowner); 342 MOWNER_ATTACH(&ip_rx_mowner); 343 #endif /* MBUFTRACE */ 344 345 ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS); 346 } 347 348 struct sockaddr_in ipaddr = { 349 .sin_len = sizeof(ipaddr), 350 .sin_family = AF_INET, 351 }; 352 struct route ipforward_rt; 353 354 /* 355 * IP software interrupt routine 356 */ 357 void 358 ipintr(void) 359 { 360 int s; 361 struct mbuf *m; 362 struct ifqueue lcl_intrq; 363 364 memset(&lcl_intrq, 0, sizeof(lcl_intrq)); 365 366 mutex_enter(softnet_lock); 367 KERNEL_LOCK(1, NULL); 368 if (!IF_IS_EMPTY(&ipintrq)) { 369 s = splnet(); 370 371 /* Take existing queue onto stack */ 372 lcl_intrq = ipintrq; 373 374 /* Zero out global queue, preserving maxlen and drops */ 375 ipintrq.ifq_head = NULL; 376 ipintrq.ifq_tail = NULL; 377 ipintrq.ifq_len = 0; 378 ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen; 379 ipintrq.ifq_drops = lcl_intrq.ifq_drops; 380 381 splx(s); 382 } 383 KERNEL_UNLOCK_ONE(NULL); 384 while (!IF_IS_EMPTY(&lcl_intrq)) { 385 IF_DEQUEUE(&lcl_intrq, m); 386 if (m == NULL) 387 break; 388 ip_input(m); 389 } 390 mutex_exit(softnet_lock); 391 } 392 393 /* 394 * Ip input routine. Checksum and byte swap header. If fragmented 395 * try to reassemble. Process options. Pass to next level. 396 */ 397 void 398 ip_input(struct mbuf *m) 399 { 400 struct ip *ip = NULL; 401 struct in_ifaddr *ia; 402 struct ifaddr *ifa; 403 int hlen = 0, len; 404 int downmatch; 405 int checkif; 406 int srcrt = 0; 407 #ifdef FAST_IPSEC 408 struct m_tag *mtag; 409 struct tdb_ident *tdbi; 410 struct secpolicy *sp; 411 int error, s; 412 #endif /* FAST_IPSEC */ 413 414 MCLAIM(m, &ip_rx_mowner); 415 KASSERT((m->m_flags & M_PKTHDR) != 0); 416 417 /* 418 * If no IP addresses have been set yet but the interfaces 419 * are receiving, can't do anything with incoming packets yet. 420 */ 421 if (TAILQ_FIRST(&in_ifaddrhead) == 0) 422 goto bad; 423 IP_STATINC(IP_STAT_TOTAL); 424 /* 425 * If the IP header is not aligned, slurp it up into a new 426 * mbuf with space for link headers, in the event we forward 427 * it. Otherwise, if it is aligned, make sure the entire 428 * base IP header is in the first mbuf of the chain. 429 */ 430 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 431 if ((m = m_copyup(m, sizeof(struct ip), 432 (max_linkhdr + 3) & ~3)) == NULL) { 433 /* XXXJRT new stat, please */ 434 IP_STATINC(IP_STAT_TOOSMALL); 435 return; 436 } 437 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 438 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 439 IP_STATINC(IP_STAT_TOOSMALL); 440 return; 441 } 442 } 443 ip = mtod(m, struct ip *); 444 if (ip->ip_v != IPVERSION) { 445 IP_STATINC(IP_STAT_BADVERS); 446 goto bad; 447 } 448 hlen = ip->ip_hl << 2; 449 if (hlen < sizeof(struct ip)) { /* minimum header length */ 450 IP_STATINC(IP_STAT_BADHLEN); 451 goto bad; 452 } 453 if (hlen > m->m_len) { 454 if ((m = m_pullup(m, hlen)) == NULL) { 455 IP_STATINC(IP_STAT_BADHLEN); 456 return; 457 } 458 ip = mtod(m, struct ip *); 459 } 460 461 /* 462 * RFC1122: packets with a multicast source address are 463 * not allowed. 464 */ 465 if (IN_MULTICAST(ip->ip_src.s_addr)) { 466 IP_STATINC(IP_STAT_BADADDR); 467 goto bad; 468 } 469 470 /* 127/8 must not appear on wire - RFC1122 */ 471 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 472 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 473 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 474 IP_STATINC(IP_STAT_BADADDR); 475 goto bad; 476 } 477 } 478 479 switch (m->m_pkthdr.csum_flags & 480 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 481 M_CSUM_IPv4_BAD)) { 482 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 483 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 484 goto badcsum; 485 486 case M_CSUM_IPv4: 487 /* Checksum was okay. */ 488 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 489 break; 490 491 default: 492 /* 493 * Must compute it ourselves. Maybe skip checksum on 494 * loopback interfaces. 495 */ 496 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 497 IFF_LOOPBACK) || ip_do_loopback_cksum)) { 498 INET_CSUM_COUNTER_INCR(&ip_swcsum); 499 if (in_cksum(m, hlen) != 0) 500 goto badcsum; 501 } 502 break; 503 } 504 505 /* Retrieve the packet length. */ 506 len = ntohs(ip->ip_len); 507 508 /* 509 * Check for additional length bogosity 510 */ 511 if (len < hlen) { 512 IP_STATINC(IP_STAT_BADLEN); 513 goto bad; 514 } 515 516 /* 517 * Check that the amount of data in the buffers 518 * is as at least much as the IP header would have us expect. 519 * Trim mbufs if longer than we expect. 520 * Drop packet if shorter than we expect. 521 */ 522 if (m->m_pkthdr.len < len) { 523 IP_STATINC(IP_STAT_TOOSHORT); 524 goto bad; 525 } 526 if (m->m_pkthdr.len > len) { 527 if (m->m_len == m->m_pkthdr.len) { 528 m->m_len = len; 529 m->m_pkthdr.len = len; 530 } else 531 m_adj(m, len - m->m_pkthdr.len); 532 } 533 534 /* 535 * Assume that we can create a fast-forward IP flow entry 536 * based on this packet. 537 */ 538 m->m_flags |= M_CANFASTFWD; 539 540 #ifdef PFIL_HOOKS 541 /* 542 * Run through list of hooks for input packets. If there are any 543 * filters which require that additional packets in the flow are 544 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 545 * Note that filters must _never_ set this flag, as another filter 546 * in the list may have previously cleared it. 547 */ 548 /* 549 * let ipfilter look at packet on the wire, 550 * not the decapsulated packet. 551 */ 552 #if defined(FAST_IPSEC) 553 if (!ipsec_indone(m)) 554 #else 555 if (1) 556 #endif 557 { 558 struct in_addr odst; 559 560 odst = ip->ip_dst; 561 if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif, 562 PFIL_IN) != 0) 563 return; 564 if (m == NULL) 565 return; 566 ip = mtod(m, struct ip *); 567 hlen = ip->ip_hl << 2; 568 /* 569 * XXX The setting of "srcrt" here is to prevent ip_forward() 570 * from generating ICMP redirects for packets that have 571 * been redirected by a hook back out on to the same LAN that 572 * they came from and is not an indication that the packet 573 * is being inffluenced by source routing options. This 574 * allows things like 575 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" 576 * where tlp0 is both on the 1.1.1.0/24 network and is the 577 * default route for hosts on 1.1.1.0/24. Of course this 578 * also requires a "map tlp0 ..." to complete the story. 579 * One might argue whether or not this kind of network config. 580 * should be supported in this manner... 581 */ 582 srcrt = (odst.s_addr != ip->ip_dst.s_addr); 583 } 584 #endif /* PFIL_HOOKS */ 585 586 #ifdef ALTQ 587 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 588 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) { 589 /* packet dropped by traffic conditioner */ 590 return; 591 } 592 #endif 593 594 /* 595 * Process options and, if not destined for us, 596 * ship it on. ip_dooptions returns 1 when an 597 * error was detected (causing an icmp message 598 * to be sent and the original packet to be freed). 599 */ 600 ip_nhops = 0; /* for source routed packets */ 601 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 602 return; 603 604 /* 605 * Enable a consistency check between the destination address 606 * and the arrival interface for a unicast packet (the RFC 1122 607 * strong ES model) if IP forwarding is disabled and the packet 608 * is not locally generated. 609 * 610 * XXX - Checking also should be disabled if the destination 611 * address is ipnat'ed to a different interface. 612 * 613 * XXX - Checking is incompatible with IP aliases added 614 * to the loopback interface instead of the interface where 615 * the packets are received. 616 * 617 * XXX - We need to add a per ifaddr flag for this so that 618 * we get finer grain control. 619 */ 620 checkif = ip_checkinterface && (ipforwarding == 0) && 621 (m->m_pkthdr.rcvif != NULL) && 622 ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0); 623 624 /* 625 * Check our list of addresses, to see if the packet is for us. 626 * 627 * Traditional 4.4BSD did not consult IFF_UP at all. 628 * The behavior here is to treat addresses on !IFF_UP interface 629 * as not mine. 630 */ 631 downmatch = 0; 632 LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 633 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 634 if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif) 635 continue; 636 if ((ia->ia_ifp->if_flags & IFF_UP) != 0) 637 break; 638 else 639 downmatch++; 640 } 641 } 642 if (ia != NULL) 643 goto ours; 644 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { 645 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 646 if (ifa->ifa_addr->sa_family != AF_INET) 647 continue; 648 ia = ifatoia(ifa); 649 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 650 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 651 /* 652 * Look for all-0's host part (old broadcast addr), 653 * either for subnet or net. 654 */ 655 ip->ip_dst.s_addr == ia->ia_subnet || 656 ip->ip_dst.s_addr == ia->ia_net) 657 goto ours; 658 /* 659 * An interface with IP address zero accepts 660 * all packets that arrive on that interface. 661 */ 662 if (in_nullhost(ia->ia_addr.sin_addr)) 663 goto ours; 664 } 665 } 666 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 667 struct in_multi *inm; 668 #ifdef MROUTING 669 extern struct socket *ip_mrouter; 670 671 if (ip_mrouter) { 672 /* 673 * If we are acting as a multicast router, all 674 * incoming multicast packets are passed to the 675 * kernel-level multicast forwarding function. 676 * The packet is returned (relatively) intact; if 677 * ip_mforward() returns a non-zero value, the packet 678 * must be discarded, else it may be accepted below. 679 * 680 * (The IP ident field is put in the same byte order 681 * as expected when ip_mforward() is called from 682 * ip_output().) 683 */ 684 if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { 685 IP_STATINC(IP_STAT_CANTFORWARD); 686 m_freem(m); 687 return; 688 } 689 690 /* 691 * The process-level routing demon needs to receive 692 * all multicast IGMP packets, whether or not this 693 * host belongs to their destination groups. 694 */ 695 if (ip->ip_p == IPPROTO_IGMP) 696 goto ours; 697 IP_STATINC(IP_STAT_CANTFORWARD); 698 } 699 #endif 700 /* 701 * See if we belong to the destination multicast group on the 702 * arrival interface. 703 */ 704 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 705 if (inm == NULL) { 706 IP_STATINC(IP_STAT_CANTFORWARD); 707 m_freem(m); 708 return; 709 } 710 goto ours; 711 } 712 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 713 in_nullhost(ip->ip_dst)) 714 goto ours; 715 716 /* 717 * Not for us; forward if possible and desirable. 718 */ 719 if (ipforwarding == 0) { 720 IP_STATINC(IP_STAT_CANTFORWARD); 721 m_freem(m); 722 } else { 723 /* 724 * If ip_dst matched any of my address on !IFF_UP interface, 725 * and there's no IFF_UP interface that matches ip_dst, 726 * send icmp unreach. Forwarding it will result in in-kernel 727 * forwarding loop till TTL goes to 0. 728 */ 729 if (downmatch) { 730 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 731 IP_STATINC(IP_STAT_CANTFORWARD); 732 return; 733 } 734 #ifdef FAST_IPSEC 735 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 736 s = splsoftnet(); 737 if (mtag != NULL) { 738 tdbi = (struct tdb_ident *)(mtag + 1); 739 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 740 } else { 741 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 742 IP_FORWARDING, &error); 743 } 744 if (sp == NULL) { /* NB: can happen if error */ 745 splx(s); 746 /*XXX error stat???*/ 747 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/ 748 goto bad; 749 } 750 751 /* 752 * Check security policy against packet attributes. 753 */ 754 error = ipsec_in_reject(sp, m); 755 KEY_FREESP(&sp); 756 splx(s); 757 if (error) { 758 IP_STATINC(IP_STAT_CANTFORWARD); 759 goto bad; 760 } 761 762 /* 763 * Peek at the outbound SP for this packet to determine if 764 * it's a Fast Forward candidate. 765 */ 766 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 767 if (mtag != NULL) 768 m->m_flags &= ~M_CANFASTFWD; 769 else { 770 s = splsoftnet(); 771 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, 772 (IP_FORWARDING | 773 (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 774 &error, NULL); 775 if (sp != NULL) { 776 m->m_flags &= ~M_CANFASTFWD; 777 KEY_FREESP(&sp); 778 } 779 splx(s); 780 } 781 #endif /* FAST_IPSEC */ 782 783 ip_forward(m, srcrt); 784 } 785 return; 786 787 ours: 788 /* 789 * If offset or IP_MF are set, must reassemble. 790 */ 791 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 792 /* 793 * Pass to IP reassembly mechanism. 794 */ 795 if (ip_reass_packet(&m, ip) != 0) { 796 /* Failed; invalid fragment(s) or packet. */ 797 goto bad; 798 } 799 if (m == NULL) { 800 /* More fragments should come; silently return. */ 801 return; 802 } 803 /* 804 * Reassembly is done, we have the final packet. 805 * Updated cached data in local variable(s). 806 */ 807 ip = mtod(m, struct ip *); 808 hlen = ip->ip_hl << 2; 809 } 810 811 #ifdef FAST_IPSEC 812 /* 813 * enforce IPsec policy checking if we are seeing last header. 814 * note that we do not visit this with protocols with pcb layer 815 * code - like udp/tcp/raw ip. 816 */ 817 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { 818 /* 819 * Check if the packet has already had IPsec processing 820 * done. If so, then just pass it along. This tag gets 821 * set during AH, ESP, etc. input handling, before the 822 * packet is returned to the ip input queue for delivery. 823 */ 824 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 825 s = splsoftnet(); 826 if (mtag != NULL) { 827 tdbi = (struct tdb_ident *)(mtag + 1); 828 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 829 } else { 830 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 831 IP_FORWARDING, &error); 832 } 833 if (sp != NULL) { 834 /* 835 * Check security policy against packet attributes. 836 */ 837 error = ipsec_in_reject(sp, m); 838 KEY_FREESP(&sp); 839 } else { 840 /* XXX error stat??? */ 841 error = EINVAL; 842 DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/ 843 } 844 splx(s); 845 if (error) 846 goto bad; 847 } 848 #endif /* FAST_IPSEC */ 849 850 /* 851 * Switch out to protocol's input routine. 852 */ 853 #if IFA_STATS 854 if (ia && ip) 855 ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 856 #endif 857 IP_STATINC(IP_STAT_DELIVERED); 858 { 859 int off = hlen, nh = ip->ip_p; 860 861 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 862 return; 863 } 864 bad: 865 m_freem(m); 866 return; 867 868 badcsum: 869 IP_STATINC(IP_STAT_BADSUM); 870 m_freem(m); 871 } 872 873 /* 874 * IP timer processing. 875 */ 876 void 877 ip_slowtimo(void) 878 { 879 880 mutex_enter(softnet_lock); 881 KERNEL_LOCK(1, NULL); 882 883 ip_reass_slowtimo(); 884 885 KERNEL_UNLOCK_ONE(NULL); 886 mutex_exit(softnet_lock); 887 } 888 889 /* 890 * IP drain processing. 891 */ 892 void 893 ip_drain(void) 894 { 895 896 KERNEL_LOCK(1, NULL); 897 ip_reass_drain(); 898 KERNEL_UNLOCK_ONE(NULL); 899 } 900 901 /* 902 * Do option processing on a datagram, 903 * possibly discarding it if bad options are encountered, 904 * or forwarding it if source-routed. 905 * Returns 1 if packet has been forwarded/freed, 906 * 0 if the packet should be processed further. 907 */ 908 int 909 ip_dooptions(struct mbuf *m) 910 { 911 struct ip *ip = mtod(m, struct ip *); 912 u_char *cp, *cp0; 913 struct ip_timestamp *ipt; 914 struct in_ifaddr *ia; 915 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 916 struct in_addr dst; 917 n_time ntime; 918 919 dst = ip->ip_dst; 920 cp = (u_char *)(ip + 1); 921 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 922 for (; cnt > 0; cnt -= optlen, cp += optlen) { 923 opt = cp[IPOPT_OPTVAL]; 924 if (opt == IPOPT_EOL) 925 break; 926 if (opt == IPOPT_NOP) 927 optlen = 1; 928 else { 929 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 930 code = &cp[IPOPT_OLEN] - (u_char *)ip; 931 goto bad; 932 } 933 optlen = cp[IPOPT_OLEN]; 934 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 935 code = &cp[IPOPT_OLEN] - (u_char *)ip; 936 goto bad; 937 } 938 } 939 switch (opt) { 940 941 default: 942 break; 943 944 /* 945 * Source routing with record. 946 * Find interface with current destination address. 947 * If none on this machine then drop if strictly routed, 948 * or do nothing if loosely routed. 949 * Record interface address and bring up next address 950 * component. If strictly routed make sure next 951 * address is on directly accessible net. 952 */ 953 case IPOPT_LSRR: 954 case IPOPT_SSRR: 955 if (ip_allowsrcrt == 0) { 956 type = ICMP_UNREACH; 957 code = ICMP_UNREACH_NET_PROHIB; 958 goto bad; 959 } 960 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 961 code = &cp[IPOPT_OLEN] - (u_char *)ip; 962 goto bad; 963 } 964 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 965 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 966 goto bad; 967 } 968 ipaddr.sin_addr = ip->ip_dst; 969 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 970 if (ia == 0) { 971 if (opt == IPOPT_SSRR) { 972 type = ICMP_UNREACH; 973 code = ICMP_UNREACH_SRCFAIL; 974 goto bad; 975 } 976 /* 977 * Loose routing, and not at next destination 978 * yet; nothing to do except forward. 979 */ 980 break; 981 } 982 off--; /* 0 origin */ 983 if ((off + sizeof(struct in_addr)) > optlen) { 984 /* 985 * End of source route. Should be for us. 986 */ 987 save_rte(cp, ip->ip_src); 988 break; 989 } 990 /* 991 * locate outgoing interface 992 */ 993 memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), 994 sizeof(ipaddr.sin_addr)); 995 if (opt == IPOPT_SSRR) 996 ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr))); 997 else 998 ia = ip_rtaddr(ipaddr.sin_addr); 999 if (ia == 0) { 1000 type = ICMP_UNREACH; 1001 code = ICMP_UNREACH_SRCFAIL; 1002 goto bad; 1003 } 1004 ip->ip_dst = ipaddr.sin_addr; 1005 bcopy((void *)&ia->ia_addr.sin_addr, 1006 (void *)(cp + off), sizeof(struct in_addr)); 1007 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1008 /* 1009 * Let ip_intr's mcast routing check handle mcast pkts 1010 */ 1011 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 1012 break; 1013 1014 case IPOPT_RR: 1015 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1016 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1017 goto bad; 1018 } 1019 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1020 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1021 goto bad; 1022 } 1023 /* 1024 * If no space remains, ignore. 1025 */ 1026 off--; /* 0 origin */ 1027 if ((off + sizeof(struct in_addr)) > optlen) 1028 break; 1029 memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst), 1030 sizeof(ipaddr.sin_addr)); 1031 /* 1032 * locate outgoing interface; if we're the destination, 1033 * use the incoming interface (should be same). 1034 */ 1035 if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))) 1036 == NULL && 1037 (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) { 1038 type = ICMP_UNREACH; 1039 code = ICMP_UNREACH_HOST; 1040 goto bad; 1041 } 1042 bcopy((void *)&ia->ia_addr.sin_addr, 1043 (void *)(cp + off), sizeof(struct in_addr)); 1044 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1045 break; 1046 1047 case IPOPT_TS: 1048 code = cp - (u_char *)ip; 1049 ipt = (struct ip_timestamp *)cp; 1050 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1051 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1052 goto bad; 1053 } 1054 if (ipt->ipt_ptr < 5) { 1055 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1056 goto bad; 1057 } 1058 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 1059 if (++ipt->ipt_oflw == 0) { 1060 code = (u_char *)&ipt->ipt_ptr - 1061 (u_char *)ip; 1062 goto bad; 1063 } 1064 break; 1065 } 1066 cp0 = (cp + ipt->ipt_ptr - 1); 1067 switch (ipt->ipt_flg) { 1068 1069 case IPOPT_TS_TSONLY: 1070 break; 1071 1072 case IPOPT_TS_TSANDADDR: 1073 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1074 sizeof(struct in_addr) > ipt->ipt_len) { 1075 code = (u_char *)&ipt->ipt_ptr - 1076 (u_char *)ip; 1077 goto bad; 1078 } 1079 ipaddr.sin_addr = dst; 1080 ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr), 1081 m->m_pkthdr.rcvif)); 1082 if (ia == 0) 1083 continue; 1084 bcopy(&ia->ia_addr.sin_addr, 1085 cp0, sizeof(struct in_addr)); 1086 ipt->ipt_ptr += sizeof(struct in_addr); 1087 break; 1088 1089 case IPOPT_TS_PRESPEC: 1090 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1091 sizeof(struct in_addr) > ipt->ipt_len) { 1092 code = (u_char *)&ipt->ipt_ptr - 1093 (u_char *)ip; 1094 goto bad; 1095 } 1096 memcpy(&ipaddr.sin_addr, cp0, 1097 sizeof(struct in_addr)); 1098 if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))) 1099 == NULL) 1100 continue; 1101 ipt->ipt_ptr += sizeof(struct in_addr); 1102 break; 1103 1104 default: 1105 /* XXX can't take &ipt->ipt_flg */ 1106 code = (u_char *)&ipt->ipt_ptr - 1107 (u_char *)ip + 1; 1108 goto bad; 1109 } 1110 ntime = iptime(); 1111 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1112 memmove((char *)cp + ipt->ipt_ptr - 1, cp0, 1113 sizeof(n_time)); 1114 ipt->ipt_ptr += sizeof(n_time); 1115 } 1116 } 1117 if (forward) { 1118 if (ip_forwsrcrt == 0) { 1119 type = ICMP_UNREACH; 1120 code = ICMP_UNREACH_SRCFAIL; 1121 goto bad; 1122 } 1123 ip_forward(m, 1); 1124 return (1); 1125 } 1126 return (0); 1127 bad: 1128 icmp_error(m, type, code, 0, 0); 1129 IP_STATINC(IP_STAT_BADOPTIONS); 1130 return (1); 1131 } 1132 1133 /* 1134 * Given address of next destination (final or next hop), 1135 * return internet address info of interface to be used to get there. 1136 */ 1137 struct in_ifaddr * 1138 ip_rtaddr(struct in_addr dst) 1139 { 1140 struct rtentry *rt; 1141 union { 1142 struct sockaddr dst; 1143 struct sockaddr_in dst4; 1144 } u; 1145 1146 sockaddr_in_init(&u.dst4, &dst, 0); 1147 1148 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) 1149 return NULL; 1150 1151 return ifatoia(rt->rt_ifa); 1152 } 1153 1154 /* 1155 * Save incoming source route for use in replies, 1156 * to be picked up later by ip_srcroute if the receiver is interested. 1157 */ 1158 void 1159 save_rte(u_char *option, struct in_addr dst) 1160 { 1161 unsigned olen; 1162 1163 olen = option[IPOPT_OLEN]; 1164 #ifdef DIAGNOSTIC 1165 if (ipprintfs) 1166 printf("save_rte: olen %d\n", olen); 1167 #endif /* 0 */ 1168 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1169 return; 1170 memcpy((void *)ip_srcrt.srcopt, (void *)option, olen); 1171 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1172 ip_srcrt.dst = dst; 1173 } 1174 1175 /* 1176 * Retrieve incoming source route for use in replies, 1177 * in the same form used by setsockopt. 1178 * The first hop is placed before the options, will be removed later. 1179 */ 1180 struct mbuf * 1181 ip_srcroute(void) 1182 { 1183 struct in_addr *p, *q; 1184 struct mbuf *m; 1185 1186 if (ip_nhops == 0) 1187 return NULL; 1188 m = m_get(M_DONTWAIT, MT_SOOPTS); 1189 if (m == 0) 1190 return NULL; 1191 1192 MCLAIM(m, &inetdomain.dom_mowner); 1193 #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1194 1195 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1196 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1197 OPTSIZ; 1198 #ifdef DIAGNOSTIC 1199 if (ipprintfs) 1200 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1201 #endif 1202 1203 /* 1204 * First save first hop for return route 1205 */ 1206 p = &ip_srcrt.route[ip_nhops - 1]; 1207 *(mtod(m, struct in_addr *)) = *p--; 1208 #ifdef DIAGNOSTIC 1209 if (ipprintfs) 1210 printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr)); 1211 #endif 1212 1213 /* 1214 * Copy option fields and padding (nop) to mbuf. 1215 */ 1216 ip_srcrt.nop = IPOPT_NOP; 1217 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1218 memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop, 1219 OPTSIZ); 1220 q = (struct in_addr *)(mtod(m, char *) + 1221 sizeof(struct in_addr) + OPTSIZ); 1222 #undef OPTSIZ 1223 /* 1224 * Record return path as an IP source route, 1225 * reversing the path (pointers are now aligned). 1226 */ 1227 while (p >= ip_srcrt.route) { 1228 #ifdef DIAGNOSTIC 1229 if (ipprintfs) 1230 printf(" %x", ntohl(q->s_addr)); 1231 #endif 1232 *q++ = *p--; 1233 } 1234 /* 1235 * Last hop goes to final destination. 1236 */ 1237 *q = ip_srcrt.dst; 1238 #ifdef DIAGNOSTIC 1239 if (ipprintfs) 1240 printf(" %x\n", ntohl(q->s_addr)); 1241 #endif 1242 return (m); 1243 } 1244 1245 const int inetctlerrmap[PRC_NCMDS] = { 1246 [PRC_MSGSIZE] = EMSGSIZE, 1247 [PRC_HOSTDEAD] = EHOSTDOWN, 1248 [PRC_HOSTUNREACH] = EHOSTUNREACH, 1249 [PRC_UNREACH_NET] = EHOSTUNREACH, 1250 [PRC_UNREACH_HOST] = EHOSTUNREACH, 1251 [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, 1252 [PRC_UNREACH_PORT] = ECONNREFUSED, 1253 [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, 1254 [PRC_PARAMPROB] = ENOPROTOOPT, 1255 }; 1256 1257 void 1258 ip_fasttimo(void) 1259 { 1260 if (ip_drainwanted) { 1261 ip_drain(); 1262 ip_drainwanted = 0; 1263 } 1264 } 1265 1266 void 1267 ip_drainstub(void) 1268 { 1269 ip_drainwanted = 1; 1270 } 1271 1272 /* 1273 * Forward a packet. If some error occurs return the sender 1274 * an icmp packet. Note we can't always generate a meaningful 1275 * icmp message because icmp doesn't have a large enough repertoire 1276 * of codes and types. 1277 * 1278 * If not forwarding, just drop the packet. This could be confusing 1279 * if ipforwarding was zero but some routing protocol was advancing 1280 * us as a gateway to somewhere. However, we must let the routing 1281 * protocol deal with that. 1282 * 1283 * The srcrt parameter indicates whether the packet is being forwarded 1284 * via a source route. 1285 */ 1286 void 1287 ip_forward(struct mbuf *m, int srcrt) 1288 { 1289 struct ip *ip = mtod(m, struct ip *); 1290 struct rtentry *rt; 1291 int error, type = 0, code = 0, destmtu = 0; 1292 struct mbuf *mcopy; 1293 n_long dest; 1294 union { 1295 struct sockaddr dst; 1296 struct sockaddr_in dst4; 1297 } u; 1298 1299 /* 1300 * We are now in the output path. 1301 */ 1302 MCLAIM(m, &ip_tx_mowner); 1303 1304 /* 1305 * Clear any in-bound checksum flags for this packet. 1306 */ 1307 m->m_pkthdr.csum_flags = 0; 1308 1309 dest = 0; 1310 #ifdef DIAGNOSTIC 1311 if (ipprintfs) { 1312 printf("forward: src %s ", inet_ntoa(ip->ip_src)); 1313 printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl); 1314 } 1315 #endif 1316 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1317 IP_STATINC(IP_STAT_CANTFORWARD); 1318 m_freem(m); 1319 return; 1320 } 1321 if (ip->ip_ttl <= IPTTLDEC) { 1322 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1323 return; 1324 } 1325 1326 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1327 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) { 1328 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); 1329 return; 1330 } 1331 1332 /* 1333 * Save at most 68 bytes of the packet in case 1334 * we need to generate an ICMP message to the src. 1335 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1336 */ 1337 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1338 if (mcopy) 1339 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1340 1341 ip->ip_ttl -= IPTTLDEC; 1342 1343 /* 1344 * If forwarding packet using same interface that it came in on, 1345 * perhaps should send a redirect to sender to shortcut a hop. 1346 * Only send redirect if source is sending directly to us, 1347 * and if packet was not source routed (or has any options). 1348 * Also, don't send redirect if forwarding using a default route 1349 * or a route modified by a redirect. 1350 */ 1351 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1352 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1353 !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && 1354 ipsendredirects && !srcrt) { 1355 if (rt->rt_ifa && 1356 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1357 ifatoia(rt->rt_ifa)->ia_subnet) { 1358 if (rt->rt_flags & RTF_GATEWAY) 1359 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1360 else 1361 dest = ip->ip_dst.s_addr; 1362 /* 1363 * Router requirements says to only send host 1364 * redirects. 1365 */ 1366 type = ICMP_REDIRECT; 1367 code = ICMP_REDIRECT_HOST; 1368 #ifdef DIAGNOSTIC 1369 if (ipprintfs) 1370 printf("redirect (%d) to %x\n", code, 1371 (u_int32_t)dest); 1372 #endif 1373 } 1374 } 1375 1376 error = ip_output(m, NULL, &ipforward_rt, 1377 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 1378 NULL, NULL); 1379 1380 if (error) 1381 IP_STATINC(IP_STAT_CANTFORWARD); 1382 else { 1383 uint64_t *ips = IP_STAT_GETREF(); 1384 ips[IP_STAT_FORWARD]++; 1385 if (type) { 1386 ips[IP_STAT_REDIRECTSENT]++; 1387 IP_STAT_PUTREF(); 1388 } else { 1389 IP_STAT_PUTREF(); 1390 if (mcopy) { 1391 #ifdef GATEWAY 1392 if (mcopy->m_flags & M_CANFASTFWD) 1393 ipflow_create(&ipforward_rt, mcopy); 1394 #endif 1395 m_freem(mcopy); 1396 } 1397 return; 1398 } 1399 } 1400 if (mcopy == NULL) 1401 return; 1402 1403 switch (error) { 1404 1405 case 0: /* forwarded, but need redirect */ 1406 /* type, code set above */ 1407 break; 1408 1409 case ENETUNREACH: /* shouldn't happen, checked above */ 1410 case EHOSTUNREACH: 1411 case ENETDOWN: 1412 case EHOSTDOWN: 1413 default: 1414 type = ICMP_UNREACH; 1415 code = ICMP_UNREACH_HOST; 1416 break; 1417 1418 case EMSGSIZE: 1419 type = ICMP_UNREACH; 1420 code = ICMP_UNREACH_NEEDFRAG; 1421 1422 if ((rt = rtcache_validate(&ipforward_rt)) != NULL) 1423 destmtu = rt->rt_ifp->if_mtu; 1424 1425 #if defined(FAST_IPSEC) 1426 { 1427 /* 1428 * If the packet is routed over IPsec tunnel, tell the 1429 * originator the tunnel MTU. 1430 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 1431 * XXX quickhack!!! 1432 */ 1433 1434 struct secpolicy *sp; 1435 int ipsecerror; 1436 size_t ipsechdr; 1437 struct route *ro; 1438 1439 sp = ipsec4_getpolicybyaddr(mcopy, 1440 IPSEC_DIR_OUTBOUND, IP_FORWARDING, 1441 &ipsecerror); 1442 1443 if (sp != NULL) { 1444 /* count IPsec header size */ 1445 ipsechdr = ipsec4_hdrsiz(mcopy, 1446 IPSEC_DIR_OUTBOUND, NULL); 1447 1448 /* 1449 * find the correct route for outer IPv4 1450 * header, compute tunnel MTU. 1451 */ 1452 1453 if (sp->req != NULL 1454 && sp->req->sav != NULL 1455 && sp->req->sav->sah != NULL) { 1456 ro = &sp->req->sav->sah->sa_route; 1457 rt = rtcache_validate(ro); 1458 if (rt && rt->rt_ifp) { 1459 destmtu = 1460 rt->rt_rmx.rmx_mtu ? 1461 rt->rt_rmx.rmx_mtu : 1462 rt->rt_ifp->if_mtu; 1463 destmtu -= ipsechdr; 1464 } 1465 } 1466 1467 KEY_FREESP(&sp); 1468 } 1469 } 1470 #endif /*defined(FAST_IPSEC)*/ 1471 IP_STATINC(IP_STAT_CANTFRAG); 1472 break; 1473 1474 case ENOBUFS: 1475 #if 1 1476 /* 1477 * a router should not generate ICMP_SOURCEQUENCH as 1478 * required in RFC1812 Requirements for IP Version 4 Routers. 1479 * source quench could be a big problem under DoS attacks, 1480 * or if the underlying interface is rate-limited. 1481 */ 1482 if (mcopy) 1483 m_freem(mcopy); 1484 return; 1485 #else 1486 type = ICMP_SOURCEQUENCH; 1487 code = 0; 1488 break; 1489 #endif 1490 } 1491 icmp_error(mcopy, type, code, dest, destmtu); 1492 } 1493 1494 void 1495 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1496 struct mbuf *m) 1497 { 1498 1499 if (inp->inp_socket->so_options & SO_TIMESTAMP 1500 #ifdef SO_OTIMESTAMP 1501 || inp->inp_socket->so_options & SO_OTIMESTAMP 1502 #endif 1503 ) { 1504 struct timeval tv; 1505 1506 microtime(&tv); 1507 #ifdef SO_OTIMESTAMP 1508 if (inp->inp_socket->so_options & SO_OTIMESTAMP) { 1509 struct timeval50 tv50; 1510 timeval_to_timeval50(&tv, &tv50); 1511 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1512 SCM_OTIMESTAMP, SOL_SOCKET); 1513 } else 1514 #endif 1515 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1516 SCM_TIMESTAMP, SOL_SOCKET); 1517 if (*mp) 1518 mp = &(*mp)->m_next; 1519 } 1520 if (inp->inp_flags & INP_RECVDSTADDR) { 1521 *mp = sbcreatecontrol((void *) &ip->ip_dst, 1522 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1523 if (*mp) 1524 mp = &(*mp)->m_next; 1525 } 1526 #ifdef notyet 1527 /* 1528 * XXX 1529 * Moving these out of udp_input() made them even more broken 1530 * than they already were. 1531 * - fenner@parc.xerox.com 1532 */ 1533 /* options were tossed already */ 1534 if (inp->inp_flags & INP_RECVOPTS) { 1535 *mp = sbcreatecontrol((void *) opts_deleted_above, 1536 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1537 if (*mp) 1538 mp = &(*mp)->m_next; 1539 } 1540 /* ip_srcroute doesn't do what we want here, need to fix */ 1541 if (inp->inp_flags & INP_RECVRETOPTS) { 1542 *mp = sbcreatecontrol((void *) ip_srcroute(), 1543 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1544 if (*mp) 1545 mp = &(*mp)->m_next; 1546 } 1547 #endif 1548 if (inp->inp_flags & INP_RECVIF) { 1549 struct sockaddr_dl sdl; 1550 1551 sockaddr_dl_init(&sdl, sizeof(sdl), 1552 (m->m_pkthdr.rcvif != NULL) 1553 ? m->m_pkthdr.rcvif->if_index 1554 : 0, 1555 0, NULL, 0, NULL, 0); 1556 *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); 1557 if (*mp) 1558 mp = &(*mp)->m_next; 1559 } 1560 if (inp->inp_flags & INP_RECVTTL) { 1561 *mp = sbcreatecontrol((void *) &ip->ip_ttl, 1562 sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); 1563 if (*mp) 1564 mp = &(*mp)->m_next; 1565 } 1566 } 1567 1568 /* 1569 * sysctl helper routine for net.inet.ip.forwsrcrt. 1570 */ 1571 static int 1572 sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) 1573 { 1574 int error, tmp; 1575 struct sysctlnode node; 1576 1577 node = *rnode; 1578 tmp = ip_forwsrcrt; 1579 node.sysctl_data = &tmp; 1580 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1581 if (error || newp == NULL) 1582 return (error); 1583 1584 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, 1585 0, NULL, NULL, NULL); 1586 if (error) 1587 return (error); 1588 1589 ip_forwsrcrt = tmp; 1590 1591 return (0); 1592 } 1593 1594 /* 1595 * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the 1596 * range of the new value and tweaks timers if it changes. 1597 */ 1598 static int 1599 sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) 1600 { 1601 int error, tmp; 1602 struct sysctlnode node; 1603 1604 node = *rnode; 1605 tmp = ip_mtudisc_timeout; 1606 node.sysctl_data = &tmp; 1607 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1608 if (error || newp == NULL) 1609 return (error); 1610 if (tmp < 0) 1611 return (EINVAL); 1612 1613 mutex_enter(softnet_lock); 1614 1615 ip_mtudisc_timeout = tmp; 1616 rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); 1617 1618 mutex_exit(softnet_lock); 1619 1620 return (0); 1621 } 1622 1623 #ifdef GATEWAY 1624 /* 1625 * sysctl helper routine for net.inet.ip.maxflows. 1626 */ 1627 static int 1628 sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS) 1629 { 1630 int error; 1631 1632 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1633 if (error || newp == NULL) 1634 return (error); 1635 1636 mutex_enter(softnet_lock); 1637 KERNEL_LOCK(1, NULL); 1638 1639 ipflow_prune(); 1640 1641 KERNEL_UNLOCK_ONE(NULL); 1642 mutex_exit(softnet_lock); 1643 1644 return (0); 1645 } 1646 1647 static int 1648 sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS) 1649 { 1650 int error, tmp; 1651 struct sysctlnode node; 1652 1653 node = *rnode; 1654 tmp = ip_hashsize; 1655 node.sysctl_data = &tmp; 1656 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1657 if (error || newp == NULL) 1658 return (error); 1659 1660 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1661 /* 1662 * Can only fail due to malloc() 1663 */ 1664 mutex_enter(softnet_lock); 1665 KERNEL_LOCK(1, NULL); 1666 1667 error = ipflow_invalidate_all(tmp); 1668 1669 KERNEL_UNLOCK_ONE(NULL); 1670 mutex_exit(softnet_lock); 1671 1672 } else { 1673 /* 1674 * EINVAL if not a power of 2 1675 */ 1676 error = EINVAL; 1677 } 1678 1679 return error; 1680 } 1681 #endif /* GATEWAY */ 1682 1683 static int 1684 sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) 1685 { 1686 1687 return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); 1688 } 1689 1690 static void 1691 sysctl_net_inet_ip_setup(struct sysctllog **clog) 1692 { 1693 extern int subnetsarelocal, hostzeroisbroadcast; 1694 1695 sysctl_createv(clog, 0, NULL, NULL, 1696 CTLFLAG_PERMANENT, 1697 CTLTYPE_NODE, "net", NULL, 1698 NULL, 0, NULL, 0, 1699 CTL_NET, CTL_EOL); 1700 sysctl_createv(clog, 0, NULL, NULL, 1701 CTLFLAG_PERMANENT, 1702 CTLTYPE_NODE, "inet", 1703 SYSCTL_DESCR("PF_INET related settings"), 1704 NULL, 0, NULL, 0, 1705 CTL_NET, PF_INET, CTL_EOL); 1706 sysctl_createv(clog, 0, NULL, NULL, 1707 CTLFLAG_PERMANENT, 1708 CTLTYPE_NODE, "ip", 1709 SYSCTL_DESCR("IPv4 related settings"), 1710 NULL, 0, NULL, 0, 1711 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 1712 1713 sysctl_createv(clog, 0, NULL, NULL, 1714 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1715 CTLTYPE_INT, "forwarding", 1716 SYSCTL_DESCR("Enable forwarding of INET datagrams"), 1717 NULL, 0, &ipforwarding, 0, 1718 CTL_NET, PF_INET, IPPROTO_IP, 1719 IPCTL_FORWARDING, CTL_EOL); 1720 sysctl_createv(clog, 0, NULL, NULL, 1721 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1722 CTLTYPE_INT, "redirect", 1723 SYSCTL_DESCR("Enable sending of ICMP redirect messages"), 1724 NULL, 0, &ipsendredirects, 0, 1725 CTL_NET, PF_INET, IPPROTO_IP, 1726 IPCTL_SENDREDIRECTS, CTL_EOL); 1727 sysctl_createv(clog, 0, NULL, NULL, 1728 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1729 CTLTYPE_INT, "ttl", 1730 SYSCTL_DESCR("Default TTL for an INET datagram"), 1731 NULL, 0, &ip_defttl, 0, 1732 CTL_NET, PF_INET, IPPROTO_IP, 1733 IPCTL_DEFTTL, CTL_EOL); 1734 #ifdef IPCTL_DEFMTU 1735 sysctl_createv(clog, 0, NULL, NULL, 1736 CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */, 1737 CTLTYPE_INT, "mtu", 1738 SYSCTL_DESCR("Default MTA for an INET route"), 1739 NULL, 0, &ip_mtu, 0, 1740 CTL_NET, PF_INET, IPPROTO_IP, 1741 IPCTL_DEFMTU, CTL_EOL); 1742 #endif /* IPCTL_DEFMTU */ 1743 sysctl_createv(clog, 0, NULL, NULL, 1744 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1745 CTLTYPE_INT, "forwsrcrt", 1746 SYSCTL_DESCR("Enable forwarding of source-routed " 1747 "datagrams"), 1748 sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, 1749 CTL_NET, PF_INET, IPPROTO_IP, 1750 IPCTL_FORWSRCRT, CTL_EOL); 1751 sysctl_createv(clog, 0, NULL, NULL, 1752 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1753 CTLTYPE_INT, "directed-broadcast", 1754 SYSCTL_DESCR("Enable forwarding of broadcast datagrams"), 1755 NULL, 0, &ip_directedbcast, 0, 1756 CTL_NET, PF_INET, IPPROTO_IP, 1757 IPCTL_DIRECTEDBCAST, CTL_EOL); 1758 sysctl_createv(clog, 0, NULL, NULL, 1759 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1760 CTLTYPE_INT, "allowsrcrt", 1761 SYSCTL_DESCR("Accept source-routed datagrams"), 1762 NULL, 0, &ip_allowsrcrt, 0, 1763 CTL_NET, PF_INET, IPPROTO_IP, 1764 IPCTL_ALLOWSRCRT, CTL_EOL); 1765 sysctl_createv(clog, 0, NULL, NULL, 1766 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1767 CTLTYPE_INT, "subnetsarelocal", 1768 SYSCTL_DESCR("Whether logical subnets are considered " 1769 "local"), 1770 NULL, 0, &subnetsarelocal, 0, 1771 CTL_NET, PF_INET, IPPROTO_IP, 1772 IPCTL_SUBNETSARELOCAL, CTL_EOL); 1773 sysctl_createv(clog, 0, NULL, NULL, 1774 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1775 CTLTYPE_INT, "mtudisc", 1776 SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"), 1777 NULL, 0, &ip_mtudisc, 0, 1778 CTL_NET, PF_INET, IPPROTO_IP, 1779 IPCTL_MTUDISC, CTL_EOL); 1780 sysctl_createv(clog, 0, NULL, NULL, 1781 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1782 CTLTYPE_INT, "anonportmin", 1783 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1784 sysctl_net_inet_ip_ports, 0, &anonportmin, 0, 1785 CTL_NET, PF_INET, IPPROTO_IP, 1786 IPCTL_ANONPORTMIN, CTL_EOL); 1787 sysctl_createv(clog, 0, NULL, NULL, 1788 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1789 CTLTYPE_INT, "anonportmax", 1790 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1791 sysctl_net_inet_ip_ports, 0, &anonportmax, 0, 1792 CTL_NET, PF_INET, IPPROTO_IP, 1793 IPCTL_ANONPORTMAX, CTL_EOL); 1794 sysctl_createv(clog, 0, NULL, NULL, 1795 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1796 CTLTYPE_INT, "mtudisctimeout", 1797 SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"), 1798 sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0, 1799 CTL_NET, PF_INET, IPPROTO_IP, 1800 IPCTL_MTUDISCTIMEOUT, CTL_EOL); 1801 #ifdef GATEWAY 1802 sysctl_createv(clog, 0, NULL, NULL, 1803 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1804 CTLTYPE_INT, "maxflows", 1805 SYSCTL_DESCR("Number of flows for fast forwarding"), 1806 sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0, 1807 CTL_NET, PF_INET, IPPROTO_IP, 1808 IPCTL_MAXFLOWS, CTL_EOL); 1809 sysctl_createv(clog, 0, NULL, NULL, 1810 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1811 CTLTYPE_INT, "hashsize", 1812 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"), 1813 sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0, 1814 CTL_NET, PF_INET, IPPROTO_IP, 1815 CTL_CREATE, CTL_EOL); 1816 #endif /* GATEWAY */ 1817 sysctl_createv(clog, 0, NULL, NULL, 1818 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1819 CTLTYPE_INT, "hostzerobroadcast", 1820 SYSCTL_DESCR("All zeroes address is broadcast address"), 1821 NULL, 0, &hostzeroisbroadcast, 0, 1822 CTL_NET, PF_INET, IPPROTO_IP, 1823 IPCTL_HOSTZEROBROADCAST, CTL_EOL); 1824 #if NGIF > 0 1825 sysctl_createv(clog, 0, NULL, NULL, 1826 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1827 CTLTYPE_INT, "gifttl", 1828 SYSCTL_DESCR("Default TTL for a gif tunnel datagram"), 1829 NULL, 0, &ip_gif_ttl, 0, 1830 CTL_NET, PF_INET, IPPROTO_IP, 1831 IPCTL_GIF_TTL, CTL_EOL); 1832 #endif /* NGIF */ 1833 #ifndef IPNOPRIVPORTS 1834 sysctl_createv(clog, 0, NULL, NULL, 1835 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1836 CTLTYPE_INT, "lowportmin", 1837 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1838 "to assign"), 1839 sysctl_net_inet_ip_ports, 0, &lowportmin, 0, 1840 CTL_NET, PF_INET, IPPROTO_IP, 1841 IPCTL_LOWPORTMIN, CTL_EOL); 1842 sysctl_createv(clog, 0, NULL, NULL, 1843 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1844 CTLTYPE_INT, "lowportmax", 1845 SYSCTL_DESCR("Highest privileged ephemeral port number " 1846 "to assign"), 1847 sysctl_net_inet_ip_ports, 0, &lowportmax, 0, 1848 CTL_NET, PF_INET, IPPROTO_IP, 1849 IPCTL_LOWPORTMAX, CTL_EOL); 1850 #endif /* IPNOPRIVPORTS */ 1851 #if NGRE > 0 1852 sysctl_createv(clog, 0, NULL, NULL, 1853 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1854 CTLTYPE_INT, "grettl", 1855 SYSCTL_DESCR("Default TTL for a gre tunnel datagram"), 1856 NULL, 0, &ip_gre_ttl, 0, 1857 CTL_NET, PF_INET, IPPROTO_IP, 1858 IPCTL_GRE_TTL, CTL_EOL); 1859 #endif /* NGRE */ 1860 sysctl_createv(clog, 0, NULL, NULL, 1861 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1862 CTLTYPE_INT, "checkinterface", 1863 SYSCTL_DESCR("Enable receive side of Strong ES model " 1864 "from RFC1122"), 1865 NULL, 0, &ip_checkinterface, 0, 1866 CTL_NET, PF_INET, IPPROTO_IP, 1867 IPCTL_CHECKINTERFACE, CTL_EOL); 1868 sysctl_createv(clog, 0, NULL, NULL, 1869 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1870 CTLTYPE_INT, "random_id", 1871 SYSCTL_DESCR("Assign random ip_id values"), 1872 NULL, 0, &ip_do_randomid, 0, 1873 CTL_NET, PF_INET, IPPROTO_IP, 1874 IPCTL_RANDOMID, CTL_EOL); 1875 sysctl_createv(clog, 0, NULL, NULL, 1876 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1877 CTLTYPE_INT, "do_loopback_cksum", 1878 SYSCTL_DESCR("Perform IP checksum on loopback"), 1879 NULL, 0, &ip_do_loopback_cksum, 0, 1880 CTL_NET, PF_INET, IPPROTO_IP, 1881 IPCTL_LOOPBACKCKSUM, CTL_EOL); 1882 sysctl_createv(clog, 0, NULL, NULL, 1883 CTLFLAG_PERMANENT, 1884 CTLTYPE_STRUCT, "stats", 1885 SYSCTL_DESCR("IP statistics"), 1886 sysctl_net_inet_ip_stats, 0, NULL, 0, 1887 CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, 1888 CTL_EOL); 1889 } 1890 1891 void 1892 ip_statinc(u_int stat) 1893 { 1894 1895 KASSERT(stat < IP_NSTATS); 1896 IP_STATINC(stat); 1897 } 1898