1 /* $NetBSD: ip_input.c,v 1.303 2012/11/29 02:07:20 christos 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 1.303 2012/11/29 02:07:20 christos 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 #include <netinet/portalgo.h> 143 144 #ifdef FAST_IPSEC 145 #include <netipsec/ipsec.h> 146 #include <netipsec/key.h> 147 #endif /* FAST_IPSEC*/ 148 149 #ifndef IPFORWARDING 150 #ifdef GATEWAY 151 #define IPFORWARDING 1 /* forward IP packets not for us */ 152 #else /* GATEWAY */ 153 #define IPFORWARDING 0 /* don't forward IP packets not for us */ 154 #endif /* GATEWAY */ 155 #endif /* IPFORWARDING */ 156 #ifndef IPSENDREDIRECTS 157 #define IPSENDREDIRECTS 1 158 #endif 159 #ifndef IPFORWSRCRT 160 #define IPFORWSRCRT 1 /* forward source-routed packets */ 161 #endif 162 #ifndef IPALLOWSRCRT 163 #define IPALLOWSRCRT 1 /* allow source-routed packets */ 164 #endif 165 #ifndef IPMTUDISC 166 #define IPMTUDISC 1 167 #endif 168 #ifndef IPMTUDISCTIMEOUT 169 #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 170 #endif 171 172 #ifdef COMPAT_50 173 #include <compat/sys/time.h> 174 #include <compat/sys/socket.h> 175 #endif 176 177 /* 178 * Note: DIRECTED_BROADCAST is handled this way so that previous 179 * configuration using this option will Just Work. 180 */ 181 #ifndef IPDIRECTEDBCAST 182 #ifdef DIRECTED_BROADCAST 183 #define IPDIRECTEDBCAST 1 184 #else 185 #define IPDIRECTEDBCAST 0 186 #endif /* DIRECTED_BROADCAST */ 187 #endif /* IPDIRECTEDBCAST */ 188 int ipforwarding = IPFORWARDING; 189 int ipsendredirects = IPSENDREDIRECTS; 190 int ip_defttl = IPDEFTTL; 191 int ip_forwsrcrt = IPFORWSRCRT; 192 int ip_directedbcast = IPDIRECTEDBCAST; 193 int ip_allowsrcrt = IPALLOWSRCRT; 194 int ip_mtudisc = IPMTUDISC; 195 int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; 196 #ifdef DIAGNOSTIC 197 int ipprintfs = 0; 198 #endif 199 200 int ip_do_randomid = 0; 201 202 /* 203 * XXX - Setting ip_checkinterface mostly implements the receive side of 204 * the Strong ES model described in RFC 1122, but since the routing table 205 * and transmit implementation do not implement the Strong ES model, 206 * setting this to 1 results in an odd hybrid. 207 * 208 * XXX - ip_checkinterface currently must be disabled if you use ipnat 209 * to translate the destination address to another local interface. 210 * 211 * XXX - ip_checkinterface must be disabled if you add IP aliases 212 * to the loopback interface instead of the interface where the 213 * packets for those addresses are received. 214 */ 215 int ip_checkinterface = 0; 216 217 218 struct rttimer_queue *ip_mtudisc_timeout_q = NULL; 219 220 u_long in_ifaddrhash; /* size of hash table - 1 */ 221 int in_ifaddrentries; /* total number of addrs */ 222 struct in_ifaddrhead in_ifaddrhead; 223 struct in_ifaddrhashhead *in_ifaddrhashtbl; 224 u_long in_multihash; /* size of hash table - 1 */ 225 int in_multientries; /* total number of addrs */ 226 struct in_multihashhead *in_multihashtbl; 227 struct ifqueue ipintrq; 228 229 ipid_state_t * ip_ids; 230 uint16_t ip_id; 231 232 percpu_t *ipstat_percpu; 233 234 #ifdef PFIL_HOOKS 235 struct pfil_head inet_pfil_hook; 236 #endif 237 238 struct pool inmulti_pool; 239 240 #ifdef INET_CSUM_COUNTERS 241 #include <sys/device.h> 242 243 struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 244 NULL, "inet", "hwcsum bad"); 245 struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 246 NULL, "inet", "hwcsum ok"); 247 struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 248 NULL, "inet", "swcsum"); 249 250 #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 251 252 EVCNT_ATTACH_STATIC(ip_hwcsum_bad); 253 EVCNT_ATTACH_STATIC(ip_hwcsum_ok); 254 EVCNT_ATTACH_STATIC(ip_swcsum); 255 256 #else 257 258 #define INET_CSUM_COUNTER_INCR(ev) /* nothing */ 259 260 #endif /* INET_CSUM_COUNTERS */ 261 262 /* 263 * We need to save the IP options in case a protocol wants to respond 264 * to an incoming packet over the same route if the packet got here 265 * using IP source routing. This allows connection establishment and 266 * maintenance when the remote end is on a network that is not known 267 * to us. 268 */ 269 int ip_nhops = 0; 270 static struct ip_srcrt { 271 struct in_addr dst; /* final destination */ 272 char nop; /* one NOP to align */ 273 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 274 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 275 } ip_srcrt; 276 277 static int ip_drainwanted; 278 279 static void save_rte(u_char *, struct in_addr); 280 281 #ifdef MBUFTRACE 282 struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx"); 283 struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx"); 284 #endif 285 286 static void sysctl_net_inet_ip_setup(struct sysctllog **); 287 288 /* 289 * IP initialization: fill in IP protocol switch table. 290 * All protocols not implemented in kernel go to raw IP protocol handler. 291 */ 292 void 293 ip_init(void) 294 { 295 const struct protosw *pr; 296 int i; 297 298 sysctl_net_inet_ip_setup(NULL); 299 300 pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", 301 NULL, IPL_SOFTNET); 302 303 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 304 if (pr == 0) 305 panic("ip_init"); 306 for (i = 0; i < IPPROTO_MAX; i++) 307 ip_protox[i] = pr - inetsw; 308 for (pr = inetdomain.dom_protosw; 309 pr < inetdomain.dom_protoswNPROTOSW; pr++) 310 if (pr->pr_domain->dom_family == PF_INET && 311 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 312 ip_protox[pr->pr_protocol] = pr - inetsw; 313 314 ip_reass_init(); 315 316 ip_ids = ip_id_init(); 317 ip_id = time_second & 0xfffff; 318 319 ipintrq.ifq_maxlen = IFQ_MAXLEN; 320 321 TAILQ_INIT(&in_ifaddrhead); 322 in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 323 &in_ifaddrhash); 324 in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 325 &in_multihash); 326 ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); 327 #ifdef GATEWAY 328 ipflow_init(ip_hashsize); 329 #endif 330 331 #ifdef PFIL_HOOKS 332 /* Register our Packet Filter hook. */ 333 inet_pfil_hook.ph_type = PFIL_TYPE_AF; 334 inet_pfil_hook.ph_af = AF_INET; 335 i = pfil_head_register(&inet_pfil_hook); 336 if (i != 0) 337 printf("ip_init: WARNING: unable to register pfil hook, " 338 "error %d\n", i); 339 #endif /* PFIL_HOOKS */ 340 341 #ifdef MBUFTRACE 342 MOWNER_ATTACH(&ip_tx_mowner); 343 MOWNER_ATTACH(&ip_rx_mowner); 344 #endif /* MBUFTRACE */ 345 346 ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS); 347 } 348 349 struct sockaddr_in ipaddr = { 350 .sin_len = sizeof(ipaddr), 351 .sin_family = AF_INET, 352 }; 353 struct route ipforward_rt; 354 355 /* 356 * IP software interrupt routine 357 */ 358 void 359 ipintr(void) 360 { 361 int s; 362 struct mbuf *m; 363 struct ifqueue lcl_intrq; 364 365 memset(&lcl_intrq, 0, sizeof(lcl_intrq)); 366 367 mutex_enter(softnet_lock); 368 KERNEL_LOCK(1, NULL); 369 if (!IF_IS_EMPTY(&ipintrq)) { 370 s = splnet(); 371 372 /* Take existing queue onto stack */ 373 lcl_intrq = ipintrq; 374 375 /* Zero out global queue, preserving maxlen and drops */ 376 ipintrq.ifq_head = NULL; 377 ipintrq.ifq_tail = NULL; 378 ipintrq.ifq_len = 0; 379 ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen; 380 ipintrq.ifq_drops = lcl_intrq.ifq_drops; 381 382 splx(s); 383 } 384 KERNEL_UNLOCK_ONE(NULL); 385 while (!IF_IS_EMPTY(&lcl_intrq)) { 386 IF_DEQUEUE(&lcl_intrq, m); 387 if (m == NULL) 388 break; 389 ip_input(m); 390 } 391 mutex_exit(softnet_lock); 392 } 393 394 /* 395 * Ip input routine. Checksum and byte swap header. If fragmented 396 * try to reassemble. Process options. Pass to next level. 397 */ 398 void 399 ip_input(struct mbuf *m) 400 { 401 struct ip *ip = NULL; 402 struct in_ifaddr *ia; 403 struct ifaddr *ifa; 404 int hlen = 0, len; 405 int downmatch; 406 int checkif; 407 int srcrt = 0; 408 #ifdef FAST_IPSEC 409 struct m_tag *mtag; 410 struct tdb_ident *tdbi; 411 struct secpolicy *sp; 412 int error, s; 413 #endif /* FAST_IPSEC */ 414 415 MCLAIM(m, &ip_rx_mowner); 416 KASSERT((m->m_flags & M_PKTHDR) != 0); 417 418 /* 419 * If no IP addresses have been set yet but the interfaces 420 * are receiving, can't do anything with incoming packets yet. 421 */ 422 if (TAILQ_FIRST(&in_ifaddrhead) == 0) 423 goto bad; 424 IP_STATINC(IP_STAT_TOTAL); 425 /* 426 * If the IP header is not aligned, slurp it up into a new 427 * mbuf with space for link headers, in the event we forward 428 * it. Otherwise, if it is aligned, make sure the entire 429 * base IP header is in the first mbuf of the chain. 430 */ 431 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 432 if ((m = m_copyup(m, sizeof(struct ip), 433 (max_linkhdr + 3) & ~3)) == NULL) { 434 /* XXXJRT new stat, please */ 435 IP_STATINC(IP_STAT_TOOSMALL); 436 return; 437 } 438 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 439 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 440 IP_STATINC(IP_STAT_TOOSMALL); 441 return; 442 } 443 } 444 ip = mtod(m, struct ip *); 445 if (ip->ip_v != IPVERSION) { 446 IP_STATINC(IP_STAT_BADVERS); 447 goto bad; 448 } 449 hlen = ip->ip_hl << 2; 450 if (hlen < sizeof(struct ip)) { /* minimum header length */ 451 IP_STATINC(IP_STAT_BADHLEN); 452 goto bad; 453 } 454 if (hlen > m->m_len) { 455 if ((m = m_pullup(m, hlen)) == NULL) { 456 IP_STATINC(IP_STAT_BADHLEN); 457 return; 458 } 459 ip = mtod(m, struct ip *); 460 } 461 462 /* 463 * RFC1122: packets with a multicast source address are 464 * not allowed. 465 */ 466 if (IN_MULTICAST(ip->ip_src.s_addr)) { 467 IP_STATINC(IP_STAT_BADADDR); 468 goto bad; 469 } 470 471 /* 127/8 must not appear on wire - RFC1122 */ 472 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 473 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 474 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 475 IP_STATINC(IP_STAT_BADADDR); 476 goto bad; 477 } 478 } 479 480 switch (m->m_pkthdr.csum_flags & 481 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 482 M_CSUM_IPv4_BAD)) { 483 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 484 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 485 goto badcsum; 486 487 case M_CSUM_IPv4: 488 /* Checksum was okay. */ 489 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 490 break; 491 492 default: 493 /* 494 * Must compute it ourselves. Maybe skip checksum on 495 * loopback interfaces. 496 */ 497 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 498 IFF_LOOPBACK) || ip_do_loopback_cksum)) { 499 INET_CSUM_COUNTER_INCR(&ip_swcsum); 500 if (in_cksum(m, hlen) != 0) 501 goto badcsum; 502 } 503 break; 504 } 505 506 /* Retrieve the packet length. */ 507 len = ntohs(ip->ip_len); 508 509 /* 510 * Check for additional length bogosity 511 */ 512 if (len < hlen) { 513 IP_STATINC(IP_STAT_BADLEN); 514 goto bad; 515 } 516 517 /* 518 * Check that the amount of data in the buffers 519 * is as at least much as the IP header would have us expect. 520 * Trim mbufs if longer than we expect. 521 * Drop packet if shorter than we expect. 522 */ 523 if (m->m_pkthdr.len < len) { 524 IP_STATINC(IP_STAT_TOOSHORT); 525 goto bad; 526 } 527 if (m->m_pkthdr.len > len) { 528 if (m->m_len == m->m_pkthdr.len) { 529 m->m_len = len; 530 m->m_pkthdr.len = len; 531 } else 532 m_adj(m, len - m->m_pkthdr.len); 533 } 534 535 /* 536 * Assume that we can create a fast-forward IP flow entry 537 * based on this packet. 538 */ 539 m->m_flags |= M_CANFASTFWD; 540 541 #ifdef PFIL_HOOKS 542 /* 543 * Run through list of hooks for input packets. If there are any 544 * filters which require that additional packets in the flow are 545 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 546 * Note that filters must _never_ set this flag, as another filter 547 * in the list may have previously cleared it. 548 */ 549 /* 550 * let ipfilter look at packet on the wire, 551 * not the decapsulated packet. 552 */ 553 #if defined(FAST_IPSEC) 554 if (!ipsec_indone(m)) 555 #else 556 if (1) 557 #endif 558 { 559 struct in_addr odst; 560 561 odst = ip->ip_dst; 562 if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif, 563 PFIL_IN) != 0) 564 return; 565 if (m == NULL) 566 return; 567 ip = mtod(m, struct ip *); 568 hlen = ip->ip_hl << 2; 569 /* 570 * XXX The setting of "srcrt" here is to prevent ip_forward() 571 * from generating ICMP redirects for packets that have 572 * been redirected by a hook back out on to the same LAN that 573 * they came from and is not an indication that the packet 574 * is being inffluenced by source routing options. This 575 * allows things like 576 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" 577 * where tlp0 is both on the 1.1.1.0/24 network and is the 578 * default route for hosts on 1.1.1.0/24. Of course this 579 * also requires a "map tlp0 ..." to complete the story. 580 * One might argue whether or not this kind of network config. 581 * should be supported in this manner... 582 */ 583 srcrt = (odst.s_addr != ip->ip_dst.s_addr); 584 } 585 #endif /* PFIL_HOOKS */ 586 587 #ifdef ALTQ 588 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 589 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) { 590 /* packet dropped by traffic conditioner */ 591 return; 592 } 593 #endif 594 595 /* 596 * Process options and, if not destined for us, 597 * ship it on. ip_dooptions returns 1 when an 598 * error was detected (causing an icmp message 599 * to be sent and the original packet to be freed). 600 */ 601 ip_nhops = 0; /* for source routed packets */ 602 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 603 return; 604 605 /* 606 * Enable a consistency check between the destination address 607 * and the arrival interface for a unicast packet (the RFC 1122 608 * strong ES model) if IP forwarding is disabled and the packet 609 * is not locally generated. 610 * 611 * XXX - Checking also should be disabled if the destination 612 * address is ipnat'ed to a different interface. 613 * 614 * XXX - Checking is incompatible with IP aliases added 615 * to the loopback interface instead of the interface where 616 * the packets are received. 617 * 618 * XXX - We need to add a per ifaddr flag for this so that 619 * we get finer grain control. 620 */ 621 checkif = ip_checkinterface && (ipforwarding == 0) && 622 (m->m_pkthdr.rcvif != NULL) && 623 ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0); 624 625 /* 626 * Check our list of addresses, to see if the packet is for us. 627 * 628 * Traditional 4.4BSD did not consult IFF_UP at all. 629 * The behavior here is to treat addresses on !IFF_UP interface 630 * as not mine. 631 */ 632 downmatch = 0; 633 LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 634 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 635 if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif) 636 continue; 637 if ((ia->ia_ifp->if_flags & IFF_UP) != 0) 638 break; 639 else 640 downmatch++; 641 } 642 } 643 if (ia != NULL) 644 goto ours; 645 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { 646 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 647 if (ifa->ifa_addr->sa_family != AF_INET) 648 continue; 649 ia = ifatoia(ifa); 650 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 651 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 652 /* 653 * Look for all-0's host part (old broadcast addr), 654 * either for subnet or net. 655 */ 656 ip->ip_dst.s_addr == ia->ia_subnet || 657 ip->ip_dst.s_addr == ia->ia_net) 658 goto ours; 659 /* 660 * An interface with IP address zero accepts 661 * all packets that arrive on that interface. 662 */ 663 if (in_nullhost(ia->ia_addr.sin_addr)) 664 goto ours; 665 } 666 } 667 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 668 struct in_multi *inm; 669 #ifdef MROUTING 670 extern struct socket *ip_mrouter; 671 672 if (ip_mrouter) { 673 /* 674 * If we are acting as a multicast router, all 675 * incoming multicast packets are passed to the 676 * kernel-level multicast forwarding function. 677 * The packet is returned (relatively) intact; if 678 * ip_mforward() returns a non-zero value, the packet 679 * must be discarded, else it may be accepted below. 680 * 681 * (The IP ident field is put in the same byte order 682 * as expected when ip_mforward() is called from 683 * ip_output().) 684 */ 685 if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { 686 IP_STATINC(IP_STAT_CANTFORWARD); 687 m_freem(m); 688 return; 689 } 690 691 /* 692 * The process-level routing demon needs to receive 693 * all multicast IGMP packets, whether or not this 694 * host belongs to their destination groups. 695 */ 696 if (ip->ip_p == IPPROTO_IGMP) 697 goto ours; 698 IP_STATINC(IP_STAT_CANTFORWARD); 699 } 700 #endif 701 /* 702 * See if we belong to the destination multicast group on the 703 * arrival interface. 704 */ 705 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 706 if (inm == NULL) { 707 IP_STATINC(IP_STAT_CANTFORWARD); 708 m_freem(m); 709 return; 710 } 711 goto ours; 712 } 713 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 714 in_nullhost(ip->ip_dst)) 715 goto ours; 716 717 /* 718 * Not for us; forward if possible and desirable. 719 */ 720 if (ipforwarding == 0) { 721 IP_STATINC(IP_STAT_CANTFORWARD); 722 m_freem(m); 723 } else { 724 /* 725 * If ip_dst matched any of my address on !IFF_UP interface, 726 * and there's no IFF_UP interface that matches ip_dst, 727 * send icmp unreach. Forwarding it will result in in-kernel 728 * forwarding loop till TTL goes to 0. 729 */ 730 if (downmatch) { 731 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 732 IP_STATINC(IP_STAT_CANTFORWARD); 733 return; 734 } 735 #ifdef FAST_IPSEC 736 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 737 s = splsoftnet(); 738 if (mtag != NULL) { 739 tdbi = (struct tdb_ident *)(mtag + 1); 740 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 741 } else { 742 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 743 IP_FORWARDING, &error); 744 } 745 if (sp == NULL) { /* NB: can happen if error */ 746 splx(s); 747 /*XXX error stat???*/ 748 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/ 749 goto bad; 750 } 751 752 /* 753 * Check security policy against packet attributes. 754 */ 755 error = ipsec_in_reject(sp, m); 756 KEY_FREESP(&sp); 757 splx(s); 758 if (error) { 759 IP_STATINC(IP_STAT_CANTFORWARD); 760 goto bad; 761 } 762 763 /* 764 * Peek at the outbound SP for this packet to determine if 765 * it's a Fast Forward candidate. 766 */ 767 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 768 if (mtag != NULL) 769 m->m_flags &= ~M_CANFASTFWD; 770 else { 771 s = splsoftnet(); 772 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, 773 (IP_FORWARDING | 774 (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 775 &error, NULL); 776 if (sp != NULL) { 777 m->m_flags &= ~M_CANFASTFWD; 778 KEY_FREESP(&sp); 779 } 780 splx(s); 781 } 782 #endif /* FAST_IPSEC */ 783 784 ip_forward(m, srcrt); 785 } 786 return; 787 788 ours: 789 /* 790 * If offset or IP_MF are set, must reassemble. 791 */ 792 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 793 /* 794 * Pass to IP reassembly mechanism. 795 */ 796 if (ip_reass_packet(&m, ip) != 0) { 797 /* Failed; invalid fragment(s) or packet. */ 798 goto bad; 799 } 800 if (m == NULL) { 801 /* More fragments should come; silently return. */ 802 return; 803 } 804 /* 805 * Reassembly is done, we have the final packet. 806 * Updated cached data in local variable(s). 807 */ 808 ip = mtod(m, struct ip *); 809 hlen = ip->ip_hl << 2; 810 } 811 812 #ifdef FAST_IPSEC 813 /* 814 * enforce IPsec policy checking if we are seeing last header. 815 * note that we do not visit this with protocols with pcb layer 816 * code - like udp/tcp/raw ip. 817 */ 818 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { 819 /* 820 * Check if the packet has already had IPsec processing 821 * done. If so, then just pass it along. This tag gets 822 * set during AH, ESP, etc. input handling, before the 823 * packet is returned to the ip input queue for delivery. 824 */ 825 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 826 s = splsoftnet(); 827 if (mtag != NULL) { 828 tdbi = (struct tdb_ident *)(mtag + 1); 829 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 830 } else { 831 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 832 IP_FORWARDING, &error); 833 } 834 if (sp != NULL) { 835 /* 836 * Check security policy against packet attributes. 837 */ 838 error = ipsec_in_reject(sp, m); 839 KEY_FREESP(&sp); 840 } else { 841 /* XXX error stat??? */ 842 error = EINVAL; 843 DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/ 844 } 845 splx(s); 846 if (error) 847 goto bad; 848 } 849 #endif /* FAST_IPSEC */ 850 851 /* 852 * Switch out to protocol's input routine. 853 */ 854 #if IFA_STATS 855 if (ia && ip) 856 ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 857 #endif 858 IP_STATINC(IP_STAT_DELIVERED); 859 { 860 int off = hlen, nh = ip->ip_p; 861 862 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 863 return; 864 } 865 bad: 866 m_freem(m); 867 return; 868 869 badcsum: 870 IP_STATINC(IP_STAT_BADSUM); 871 m_freem(m); 872 } 873 874 /* 875 * IP timer processing. 876 */ 877 void 878 ip_slowtimo(void) 879 { 880 881 mutex_enter(softnet_lock); 882 KERNEL_LOCK(1, NULL); 883 884 ip_reass_slowtimo(); 885 886 KERNEL_UNLOCK_ONE(NULL); 887 mutex_exit(softnet_lock); 888 } 889 890 /* 891 * IP drain processing. 892 */ 893 void 894 ip_drain(void) 895 { 896 897 KERNEL_LOCK(1, NULL); 898 ip_reass_drain(); 899 KERNEL_UNLOCK_ONE(NULL); 900 } 901 902 /* 903 * Do option processing on a datagram, 904 * possibly discarding it if bad options are encountered, 905 * or forwarding it if source-routed. 906 * Returns 1 if packet has been forwarded/freed, 907 * 0 if the packet should be processed further. 908 */ 909 int 910 ip_dooptions(struct mbuf *m) 911 { 912 struct ip *ip = mtod(m, struct ip *); 913 u_char *cp, *cp0; 914 struct ip_timestamp *ipt; 915 struct in_ifaddr *ia; 916 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 917 struct in_addr dst; 918 n_time ntime; 919 920 dst = ip->ip_dst; 921 cp = (u_char *)(ip + 1); 922 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 923 for (; cnt > 0; cnt -= optlen, cp += optlen) { 924 opt = cp[IPOPT_OPTVAL]; 925 if (opt == IPOPT_EOL) 926 break; 927 if (opt == IPOPT_NOP) 928 optlen = 1; 929 else { 930 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 931 code = &cp[IPOPT_OLEN] - (u_char *)ip; 932 goto bad; 933 } 934 optlen = cp[IPOPT_OLEN]; 935 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 936 code = &cp[IPOPT_OLEN] - (u_char *)ip; 937 goto bad; 938 } 939 } 940 switch (opt) { 941 942 default: 943 break; 944 945 /* 946 * Source routing with record. 947 * Find interface with current destination address. 948 * If none on this machine then drop if strictly routed, 949 * or do nothing if loosely routed. 950 * Record interface address and bring up next address 951 * component. If strictly routed make sure next 952 * address is on directly accessible net. 953 */ 954 case IPOPT_LSRR: 955 case IPOPT_SSRR: 956 if (ip_allowsrcrt == 0) { 957 type = ICMP_UNREACH; 958 code = ICMP_UNREACH_NET_PROHIB; 959 goto bad; 960 } 961 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 962 code = &cp[IPOPT_OLEN] - (u_char *)ip; 963 goto bad; 964 } 965 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 966 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 967 goto bad; 968 } 969 ipaddr.sin_addr = ip->ip_dst; 970 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 971 if (ia == 0) { 972 if (opt == IPOPT_SSRR) { 973 type = ICMP_UNREACH; 974 code = ICMP_UNREACH_SRCFAIL; 975 goto bad; 976 } 977 /* 978 * Loose routing, and not at next destination 979 * yet; nothing to do except forward. 980 */ 981 break; 982 } 983 off--; /* 0 origin */ 984 if ((off + sizeof(struct in_addr)) > optlen) { 985 /* 986 * End of source route. Should be for us. 987 */ 988 save_rte(cp, ip->ip_src); 989 break; 990 } 991 /* 992 * locate outgoing interface 993 */ 994 memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), 995 sizeof(ipaddr.sin_addr)); 996 if (opt == IPOPT_SSRR) 997 ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr))); 998 else 999 ia = ip_rtaddr(ipaddr.sin_addr); 1000 if (ia == 0) { 1001 type = ICMP_UNREACH; 1002 code = ICMP_UNREACH_SRCFAIL; 1003 goto bad; 1004 } 1005 ip->ip_dst = ipaddr.sin_addr; 1006 bcopy((void *)&ia->ia_addr.sin_addr, 1007 (void *)(cp + off), sizeof(struct in_addr)); 1008 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1009 /* 1010 * Let ip_intr's mcast routing check handle mcast pkts 1011 */ 1012 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 1013 break; 1014 1015 case IPOPT_RR: 1016 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1017 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1018 goto bad; 1019 } 1020 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1021 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1022 goto bad; 1023 } 1024 /* 1025 * If no space remains, ignore. 1026 */ 1027 off--; /* 0 origin */ 1028 if ((off + sizeof(struct in_addr)) > optlen) 1029 break; 1030 memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst), 1031 sizeof(ipaddr.sin_addr)); 1032 /* 1033 * locate outgoing interface; if we're the destination, 1034 * use the incoming interface (should be same). 1035 */ 1036 if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))) 1037 == NULL && 1038 (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) { 1039 type = ICMP_UNREACH; 1040 code = ICMP_UNREACH_HOST; 1041 goto bad; 1042 } 1043 bcopy((void *)&ia->ia_addr.sin_addr, 1044 (void *)(cp + off), sizeof(struct in_addr)); 1045 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1046 break; 1047 1048 case IPOPT_TS: 1049 code = cp - (u_char *)ip; 1050 ipt = (struct ip_timestamp *)cp; 1051 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1052 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1053 goto bad; 1054 } 1055 if (ipt->ipt_ptr < 5) { 1056 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1057 goto bad; 1058 } 1059 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 1060 if (++ipt->ipt_oflw == 0) { 1061 code = (u_char *)&ipt->ipt_ptr - 1062 (u_char *)ip; 1063 goto bad; 1064 } 1065 break; 1066 } 1067 cp0 = (cp + ipt->ipt_ptr - 1); 1068 switch (ipt->ipt_flg) { 1069 1070 case IPOPT_TS_TSONLY: 1071 break; 1072 1073 case IPOPT_TS_TSANDADDR: 1074 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1075 sizeof(struct in_addr) > ipt->ipt_len) { 1076 code = (u_char *)&ipt->ipt_ptr - 1077 (u_char *)ip; 1078 goto bad; 1079 } 1080 ipaddr.sin_addr = dst; 1081 ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr), 1082 m->m_pkthdr.rcvif)); 1083 if (ia == 0) 1084 continue; 1085 bcopy(&ia->ia_addr.sin_addr, 1086 cp0, sizeof(struct in_addr)); 1087 ipt->ipt_ptr += sizeof(struct in_addr); 1088 break; 1089 1090 case IPOPT_TS_PRESPEC: 1091 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1092 sizeof(struct in_addr) > ipt->ipt_len) { 1093 code = (u_char *)&ipt->ipt_ptr - 1094 (u_char *)ip; 1095 goto bad; 1096 } 1097 memcpy(&ipaddr.sin_addr, cp0, 1098 sizeof(struct in_addr)); 1099 if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))) 1100 == NULL) 1101 continue; 1102 ipt->ipt_ptr += sizeof(struct in_addr); 1103 break; 1104 1105 default: 1106 /* XXX can't take &ipt->ipt_flg */ 1107 code = (u_char *)&ipt->ipt_ptr - 1108 (u_char *)ip + 1; 1109 goto bad; 1110 } 1111 ntime = iptime(); 1112 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1113 memmove((char *)cp + ipt->ipt_ptr - 1, cp0, 1114 sizeof(n_time)); 1115 ipt->ipt_ptr += sizeof(n_time); 1116 } 1117 } 1118 if (forward) { 1119 if (ip_forwsrcrt == 0) { 1120 type = ICMP_UNREACH; 1121 code = ICMP_UNREACH_SRCFAIL; 1122 goto bad; 1123 } 1124 ip_forward(m, 1); 1125 return (1); 1126 } 1127 return (0); 1128 bad: 1129 icmp_error(m, type, code, 0, 0); 1130 IP_STATINC(IP_STAT_BADOPTIONS); 1131 return (1); 1132 } 1133 1134 /* 1135 * Given address of next destination (final or next hop), 1136 * return internet address info of interface to be used to get there. 1137 */ 1138 struct in_ifaddr * 1139 ip_rtaddr(struct in_addr dst) 1140 { 1141 struct rtentry *rt; 1142 union { 1143 struct sockaddr dst; 1144 struct sockaddr_in dst4; 1145 } u; 1146 1147 sockaddr_in_init(&u.dst4, &dst, 0); 1148 1149 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) 1150 return NULL; 1151 1152 return ifatoia(rt->rt_ifa); 1153 } 1154 1155 /* 1156 * Save incoming source route for use in replies, 1157 * to be picked up later by ip_srcroute if the receiver is interested. 1158 */ 1159 void 1160 save_rte(u_char *option, struct in_addr dst) 1161 { 1162 unsigned olen; 1163 1164 olen = option[IPOPT_OLEN]; 1165 #ifdef DIAGNOSTIC 1166 if (ipprintfs) 1167 printf("save_rte: olen %d\n", olen); 1168 #endif /* 0 */ 1169 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1170 return; 1171 memcpy((void *)ip_srcrt.srcopt, (void *)option, olen); 1172 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1173 ip_srcrt.dst = dst; 1174 } 1175 1176 /* 1177 * Retrieve incoming source route for use in replies, 1178 * in the same form used by setsockopt. 1179 * The first hop is placed before the options, will be removed later. 1180 */ 1181 struct mbuf * 1182 ip_srcroute(void) 1183 { 1184 struct in_addr *p, *q; 1185 struct mbuf *m; 1186 1187 if (ip_nhops == 0) 1188 return NULL; 1189 m = m_get(M_DONTWAIT, MT_SOOPTS); 1190 if (m == 0) 1191 return NULL; 1192 1193 MCLAIM(m, &inetdomain.dom_mowner); 1194 #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1195 1196 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1197 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1198 OPTSIZ; 1199 #ifdef DIAGNOSTIC 1200 if (ipprintfs) 1201 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1202 #endif 1203 1204 /* 1205 * First save first hop for return route 1206 */ 1207 p = &ip_srcrt.route[ip_nhops - 1]; 1208 *(mtod(m, struct in_addr *)) = *p--; 1209 #ifdef DIAGNOSTIC 1210 if (ipprintfs) 1211 printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr)); 1212 #endif 1213 1214 /* 1215 * Copy option fields and padding (nop) to mbuf. 1216 */ 1217 ip_srcrt.nop = IPOPT_NOP; 1218 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1219 memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop, 1220 OPTSIZ); 1221 q = (struct in_addr *)(mtod(m, char *) + 1222 sizeof(struct in_addr) + OPTSIZ); 1223 #undef OPTSIZ 1224 /* 1225 * Record return path as an IP source route, 1226 * reversing the path (pointers are now aligned). 1227 */ 1228 while (p >= ip_srcrt.route) { 1229 #ifdef DIAGNOSTIC 1230 if (ipprintfs) 1231 printf(" %x", ntohl(q->s_addr)); 1232 #endif 1233 *q++ = *p--; 1234 } 1235 /* 1236 * Last hop goes to final destination. 1237 */ 1238 *q = ip_srcrt.dst; 1239 #ifdef DIAGNOSTIC 1240 if (ipprintfs) 1241 printf(" %x\n", ntohl(q->s_addr)); 1242 #endif 1243 return (m); 1244 } 1245 1246 const int inetctlerrmap[PRC_NCMDS] = { 1247 [PRC_MSGSIZE] = EMSGSIZE, 1248 [PRC_HOSTDEAD] = EHOSTDOWN, 1249 [PRC_HOSTUNREACH] = EHOSTUNREACH, 1250 [PRC_UNREACH_NET] = EHOSTUNREACH, 1251 [PRC_UNREACH_HOST] = EHOSTUNREACH, 1252 [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, 1253 [PRC_UNREACH_PORT] = ECONNREFUSED, 1254 [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, 1255 [PRC_PARAMPROB] = ENOPROTOOPT, 1256 }; 1257 1258 void 1259 ip_fasttimo(void) 1260 { 1261 if (ip_drainwanted) { 1262 ip_drain(); 1263 ip_drainwanted = 0; 1264 } 1265 } 1266 1267 void 1268 ip_drainstub(void) 1269 { 1270 ip_drainwanted = 1; 1271 } 1272 1273 /* 1274 * Forward a packet. If some error occurs return the sender 1275 * an icmp packet. Note we can't always generate a meaningful 1276 * icmp message because icmp doesn't have a large enough repertoire 1277 * of codes and types. 1278 * 1279 * If not forwarding, just drop the packet. This could be confusing 1280 * if ipforwarding was zero but some routing protocol was advancing 1281 * us as a gateway to somewhere. However, we must let the routing 1282 * protocol deal with that. 1283 * 1284 * The srcrt parameter indicates whether the packet is being forwarded 1285 * via a source route. 1286 */ 1287 void 1288 ip_forward(struct mbuf *m, int srcrt) 1289 { 1290 struct ip *ip = mtod(m, struct ip *); 1291 struct rtentry *rt; 1292 int error, type = 0, code = 0, destmtu = 0; 1293 struct mbuf *mcopy; 1294 n_long dest; 1295 union { 1296 struct sockaddr dst; 1297 struct sockaddr_in dst4; 1298 } u; 1299 1300 /* 1301 * We are now in the output path. 1302 */ 1303 MCLAIM(m, &ip_tx_mowner); 1304 1305 /* 1306 * Clear any in-bound checksum flags for this packet. 1307 */ 1308 m->m_pkthdr.csum_flags = 0; 1309 1310 dest = 0; 1311 #ifdef DIAGNOSTIC 1312 if (ipprintfs) { 1313 printf("forward: src %s ", inet_ntoa(ip->ip_src)); 1314 printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl); 1315 } 1316 #endif 1317 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1318 IP_STATINC(IP_STAT_CANTFORWARD); 1319 m_freem(m); 1320 return; 1321 } 1322 if (ip->ip_ttl <= IPTTLDEC) { 1323 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1324 return; 1325 } 1326 1327 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1328 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) { 1329 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); 1330 return; 1331 } 1332 1333 /* 1334 * Save at most 68 bytes of the packet in case 1335 * we need to generate an ICMP message to the src. 1336 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1337 */ 1338 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1339 if (mcopy) 1340 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1341 1342 ip->ip_ttl -= IPTTLDEC; 1343 1344 /* 1345 * If forwarding packet using same interface that it came in on, 1346 * perhaps should send a redirect to sender to shortcut a hop. 1347 * Only send redirect if source is sending directly to us, 1348 * and if packet was not source routed (or has any options). 1349 * Also, don't send redirect if forwarding using a default route 1350 * or a route modified by a redirect. 1351 */ 1352 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1353 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1354 !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && 1355 ipsendredirects && !srcrt) { 1356 if (rt->rt_ifa && 1357 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1358 ifatoia(rt->rt_ifa)->ia_subnet) { 1359 if (rt->rt_flags & RTF_GATEWAY) 1360 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1361 else 1362 dest = ip->ip_dst.s_addr; 1363 /* 1364 * Router requirements says to only send host 1365 * redirects. 1366 */ 1367 type = ICMP_REDIRECT; 1368 code = ICMP_REDIRECT_HOST; 1369 #ifdef DIAGNOSTIC 1370 if (ipprintfs) 1371 printf("redirect (%d) to %x\n", code, 1372 (u_int32_t)dest); 1373 #endif 1374 } 1375 } 1376 1377 error = ip_output(m, NULL, &ipforward_rt, 1378 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 1379 NULL, NULL); 1380 1381 if (error) 1382 IP_STATINC(IP_STAT_CANTFORWARD); 1383 else { 1384 uint64_t *ips = IP_STAT_GETREF(); 1385 ips[IP_STAT_FORWARD]++; 1386 if (type) { 1387 ips[IP_STAT_REDIRECTSENT]++; 1388 IP_STAT_PUTREF(); 1389 } else { 1390 IP_STAT_PUTREF(); 1391 if (mcopy) { 1392 #ifdef GATEWAY 1393 if (mcopy->m_flags & M_CANFASTFWD) 1394 ipflow_create(&ipforward_rt, mcopy); 1395 #endif 1396 m_freem(mcopy); 1397 } 1398 return; 1399 } 1400 } 1401 if (mcopy == NULL) 1402 return; 1403 1404 switch (error) { 1405 1406 case 0: /* forwarded, but need redirect */ 1407 /* type, code set above */ 1408 break; 1409 1410 case ENETUNREACH: /* shouldn't happen, checked above */ 1411 case EHOSTUNREACH: 1412 case ENETDOWN: 1413 case EHOSTDOWN: 1414 default: 1415 type = ICMP_UNREACH; 1416 code = ICMP_UNREACH_HOST; 1417 break; 1418 1419 case EMSGSIZE: 1420 type = ICMP_UNREACH; 1421 code = ICMP_UNREACH_NEEDFRAG; 1422 1423 if ((rt = rtcache_validate(&ipforward_rt)) != NULL) 1424 destmtu = rt->rt_ifp->if_mtu; 1425 1426 #if defined(FAST_IPSEC) 1427 { 1428 /* 1429 * If the packet is routed over IPsec tunnel, tell the 1430 * originator the tunnel MTU. 1431 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 1432 * XXX quickhack!!! 1433 */ 1434 1435 struct secpolicy *sp; 1436 int ipsecerror; 1437 size_t ipsechdr; 1438 struct route *ro; 1439 1440 sp = ipsec4_getpolicybyaddr(mcopy, 1441 IPSEC_DIR_OUTBOUND, IP_FORWARDING, 1442 &ipsecerror); 1443 1444 if (sp != NULL) { 1445 /* count IPsec header size */ 1446 ipsechdr = ipsec4_hdrsiz(mcopy, 1447 IPSEC_DIR_OUTBOUND, NULL); 1448 1449 /* 1450 * find the correct route for outer IPv4 1451 * header, compute tunnel MTU. 1452 */ 1453 1454 if (sp->req != NULL 1455 && sp->req->sav != NULL 1456 && sp->req->sav->sah != NULL) { 1457 ro = &sp->req->sav->sah->sa_route; 1458 rt = rtcache_validate(ro); 1459 if (rt && rt->rt_ifp) { 1460 destmtu = 1461 rt->rt_rmx.rmx_mtu ? 1462 rt->rt_rmx.rmx_mtu : 1463 rt->rt_ifp->if_mtu; 1464 destmtu -= ipsechdr; 1465 } 1466 } 1467 1468 KEY_FREESP(&sp); 1469 } 1470 } 1471 #endif /*defined(FAST_IPSEC)*/ 1472 IP_STATINC(IP_STAT_CANTFRAG); 1473 break; 1474 1475 case ENOBUFS: 1476 #if 1 1477 /* 1478 * a router should not generate ICMP_SOURCEQUENCH as 1479 * required in RFC1812 Requirements for IP Version 4 Routers. 1480 * source quench could be a big problem under DoS attacks, 1481 * or if the underlying interface is rate-limited. 1482 */ 1483 if (mcopy) 1484 m_freem(mcopy); 1485 return; 1486 #else 1487 type = ICMP_SOURCEQUENCH; 1488 code = 0; 1489 break; 1490 #endif 1491 } 1492 icmp_error(mcopy, type, code, dest, destmtu); 1493 } 1494 1495 void 1496 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1497 struct mbuf *m) 1498 { 1499 1500 if (inp->inp_socket->so_options & SO_TIMESTAMP 1501 #ifdef SO_OTIMESTAMP 1502 || inp->inp_socket->so_options & SO_OTIMESTAMP 1503 #endif 1504 ) { 1505 struct timeval tv; 1506 1507 microtime(&tv); 1508 #ifdef SO_OTIMESTAMP 1509 if (inp->inp_socket->so_options & SO_OTIMESTAMP) { 1510 struct timeval50 tv50; 1511 timeval_to_timeval50(&tv, &tv50); 1512 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1513 SCM_OTIMESTAMP, SOL_SOCKET); 1514 } else 1515 #endif 1516 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1517 SCM_TIMESTAMP, SOL_SOCKET); 1518 if (*mp) 1519 mp = &(*mp)->m_next; 1520 } 1521 if (inp->inp_flags & INP_RECVDSTADDR) { 1522 *mp = sbcreatecontrol((void *) &ip->ip_dst, 1523 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1524 if (*mp) 1525 mp = &(*mp)->m_next; 1526 } 1527 #ifdef notyet 1528 /* 1529 * XXX 1530 * Moving these out of udp_input() made them even more broken 1531 * than they already were. 1532 * - fenner@parc.xerox.com 1533 */ 1534 /* options were tossed already */ 1535 if (inp->inp_flags & INP_RECVOPTS) { 1536 *mp = sbcreatecontrol((void *) opts_deleted_above, 1537 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1538 if (*mp) 1539 mp = &(*mp)->m_next; 1540 } 1541 /* ip_srcroute doesn't do what we want here, need to fix */ 1542 if (inp->inp_flags & INP_RECVRETOPTS) { 1543 *mp = sbcreatecontrol((void *) ip_srcroute(), 1544 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1545 if (*mp) 1546 mp = &(*mp)->m_next; 1547 } 1548 #endif 1549 if (inp->inp_flags & INP_RECVIF) { 1550 struct sockaddr_dl sdl; 1551 1552 sockaddr_dl_init(&sdl, sizeof(sdl), 1553 (m->m_pkthdr.rcvif != NULL) 1554 ? m->m_pkthdr.rcvif->if_index 1555 : 0, 1556 0, NULL, 0, NULL, 0); 1557 *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); 1558 if (*mp) 1559 mp = &(*mp)->m_next; 1560 } 1561 if (inp->inp_flags & INP_RECVTTL) { 1562 *mp = sbcreatecontrol((void *) &ip->ip_ttl, 1563 sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); 1564 if (*mp) 1565 mp = &(*mp)->m_next; 1566 } 1567 } 1568 1569 /* 1570 * sysctl helper routine for net.inet.ip.forwsrcrt. 1571 */ 1572 static int 1573 sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) 1574 { 1575 int error, tmp; 1576 struct sysctlnode node; 1577 1578 node = *rnode; 1579 tmp = ip_forwsrcrt; 1580 node.sysctl_data = &tmp; 1581 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1582 if (error || newp == NULL) 1583 return (error); 1584 1585 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, 1586 0, NULL, NULL, NULL); 1587 if (error) 1588 return (error); 1589 1590 ip_forwsrcrt = tmp; 1591 1592 return (0); 1593 } 1594 1595 /* 1596 * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the 1597 * range of the new value and tweaks timers if it changes. 1598 */ 1599 static int 1600 sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) 1601 { 1602 int error, tmp; 1603 struct sysctlnode node; 1604 1605 node = *rnode; 1606 tmp = ip_mtudisc_timeout; 1607 node.sysctl_data = &tmp; 1608 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1609 if (error || newp == NULL) 1610 return (error); 1611 if (tmp < 0) 1612 return (EINVAL); 1613 1614 mutex_enter(softnet_lock); 1615 1616 ip_mtudisc_timeout = tmp; 1617 rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); 1618 1619 mutex_exit(softnet_lock); 1620 1621 return (0); 1622 } 1623 1624 #ifdef GATEWAY 1625 /* 1626 * sysctl helper routine for net.inet.ip.maxflows. 1627 */ 1628 static int 1629 sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS) 1630 { 1631 int error; 1632 1633 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1634 if (error || newp == NULL) 1635 return (error); 1636 1637 mutex_enter(softnet_lock); 1638 KERNEL_LOCK(1, NULL); 1639 1640 ipflow_prune(); 1641 1642 KERNEL_UNLOCK_ONE(NULL); 1643 mutex_exit(softnet_lock); 1644 1645 return (0); 1646 } 1647 1648 static int 1649 sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS) 1650 { 1651 int error, tmp; 1652 struct sysctlnode node; 1653 1654 node = *rnode; 1655 tmp = ip_hashsize; 1656 node.sysctl_data = &tmp; 1657 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1658 if (error || newp == NULL) 1659 return (error); 1660 1661 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1662 /* 1663 * Can only fail due to malloc() 1664 */ 1665 mutex_enter(softnet_lock); 1666 KERNEL_LOCK(1, NULL); 1667 1668 error = ipflow_invalidate_all(tmp); 1669 1670 KERNEL_UNLOCK_ONE(NULL); 1671 mutex_exit(softnet_lock); 1672 1673 } else { 1674 /* 1675 * EINVAL if not a power of 2 1676 */ 1677 error = EINVAL; 1678 } 1679 1680 return error; 1681 } 1682 #endif /* GATEWAY */ 1683 1684 static int 1685 sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) 1686 { 1687 1688 return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); 1689 } 1690 1691 static void 1692 sysctl_net_inet_ip_setup(struct sysctllog **clog) 1693 { 1694 extern int subnetsarelocal, hostzeroisbroadcast; 1695 1696 sysctl_createv(clog, 0, NULL, NULL, 1697 CTLFLAG_PERMANENT, 1698 CTLTYPE_NODE, "net", NULL, 1699 NULL, 0, NULL, 0, 1700 CTL_NET, CTL_EOL); 1701 sysctl_createv(clog, 0, NULL, NULL, 1702 CTLFLAG_PERMANENT, 1703 CTLTYPE_NODE, "inet", 1704 SYSCTL_DESCR("PF_INET related settings"), 1705 NULL, 0, NULL, 0, 1706 CTL_NET, PF_INET, CTL_EOL); 1707 sysctl_createv(clog, 0, NULL, NULL, 1708 CTLFLAG_PERMANENT, 1709 CTLTYPE_NODE, "ip", 1710 SYSCTL_DESCR("IPv4 related settings"), 1711 NULL, 0, NULL, 0, 1712 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 1713 1714 sysctl_createv(clog, 0, NULL, NULL, 1715 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1716 CTLTYPE_INT, "forwarding", 1717 SYSCTL_DESCR("Enable forwarding of INET datagrams"), 1718 NULL, 0, &ipforwarding, 0, 1719 CTL_NET, PF_INET, IPPROTO_IP, 1720 IPCTL_FORWARDING, CTL_EOL); 1721 sysctl_createv(clog, 0, NULL, NULL, 1722 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1723 CTLTYPE_INT, "redirect", 1724 SYSCTL_DESCR("Enable sending of ICMP redirect messages"), 1725 NULL, 0, &ipsendredirects, 0, 1726 CTL_NET, PF_INET, IPPROTO_IP, 1727 IPCTL_SENDREDIRECTS, CTL_EOL); 1728 sysctl_createv(clog, 0, NULL, NULL, 1729 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1730 CTLTYPE_INT, "ttl", 1731 SYSCTL_DESCR("Default TTL for an INET datagram"), 1732 NULL, 0, &ip_defttl, 0, 1733 CTL_NET, PF_INET, IPPROTO_IP, 1734 IPCTL_DEFTTL, CTL_EOL); 1735 #ifdef IPCTL_DEFMTU 1736 sysctl_createv(clog, 0, NULL, NULL, 1737 CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */, 1738 CTLTYPE_INT, "mtu", 1739 SYSCTL_DESCR("Default MTA for an INET route"), 1740 NULL, 0, &ip_mtu, 0, 1741 CTL_NET, PF_INET, IPPROTO_IP, 1742 IPCTL_DEFMTU, CTL_EOL); 1743 #endif /* IPCTL_DEFMTU */ 1744 sysctl_createv(clog, 0, NULL, NULL, 1745 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1746 CTLTYPE_INT, "forwsrcrt", 1747 SYSCTL_DESCR("Enable forwarding of source-routed " 1748 "datagrams"), 1749 sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, 1750 CTL_NET, PF_INET, IPPROTO_IP, 1751 IPCTL_FORWSRCRT, CTL_EOL); 1752 sysctl_createv(clog, 0, NULL, NULL, 1753 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1754 CTLTYPE_INT, "directed-broadcast", 1755 SYSCTL_DESCR("Enable forwarding of broadcast datagrams"), 1756 NULL, 0, &ip_directedbcast, 0, 1757 CTL_NET, PF_INET, IPPROTO_IP, 1758 IPCTL_DIRECTEDBCAST, CTL_EOL); 1759 sysctl_createv(clog, 0, NULL, NULL, 1760 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1761 CTLTYPE_INT, "allowsrcrt", 1762 SYSCTL_DESCR("Accept source-routed datagrams"), 1763 NULL, 0, &ip_allowsrcrt, 0, 1764 CTL_NET, PF_INET, IPPROTO_IP, 1765 IPCTL_ALLOWSRCRT, CTL_EOL); 1766 sysctl_createv(clog, 0, NULL, NULL, 1767 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1768 CTLTYPE_INT, "subnetsarelocal", 1769 SYSCTL_DESCR("Whether logical subnets are considered " 1770 "local"), 1771 NULL, 0, &subnetsarelocal, 0, 1772 CTL_NET, PF_INET, IPPROTO_IP, 1773 IPCTL_SUBNETSARELOCAL, CTL_EOL); 1774 sysctl_createv(clog, 0, NULL, NULL, 1775 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1776 CTLTYPE_INT, "mtudisc", 1777 SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"), 1778 NULL, 0, &ip_mtudisc, 0, 1779 CTL_NET, PF_INET, IPPROTO_IP, 1780 IPCTL_MTUDISC, CTL_EOL); 1781 sysctl_createv(clog, 0, NULL, NULL, 1782 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1783 CTLTYPE_INT, "anonportmin", 1784 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1785 sysctl_net_inet_ip_ports, 0, &anonportmin, 0, 1786 CTL_NET, PF_INET, IPPROTO_IP, 1787 IPCTL_ANONPORTMIN, CTL_EOL); 1788 sysctl_createv(clog, 0, NULL, NULL, 1789 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1790 CTLTYPE_INT, "anonportmax", 1791 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1792 sysctl_net_inet_ip_ports, 0, &anonportmax, 0, 1793 CTL_NET, PF_INET, IPPROTO_IP, 1794 IPCTL_ANONPORTMAX, CTL_EOL); 1795 sysctl_createv(clog, 0, NULL, NULL, 1796 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1797 CTLTYPE_INT, "mtudisctimeout", 1798 SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"), 1799 sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0, 1800 CTL_NET, PF_INET, IPPROTO_IP, 1801 IPCTL_MTUDISCTIMEOUT, CTL_EOL); 1802 #ifdef GATEWAY 1803 sysctl_createv(clog, 0, NULL, NULL, 1804 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1805 CTLTYPE_INT, "maxflows", 1806 SYSCTL_DESCR("Number of flows for fast forwarding"), 1807 sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0, 1808 CTL_NET, PF_INET, IPPROTO_IP, 1809 IPCTL_MAXFLOWS, CTL_EOL); 1810 sysctl_createv(clog, 0, NULL, NULL, 1811 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1812 CTLTYPE_INT, "hashsize", 1813 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"), 1814 sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0, 1815 CTL_NET, PF_INET, IPPROTO_IP, 1816 CTL_CREATE, CTL_EOL); 1817 #endif /* GATEWAY */ 1818 sysctl_createv(clog, 0, NULL, NULL, 1819 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1820 CTLTYPE_INT, "hostzerobroadcast", 1821 SYSCTL_DESCR("All zeroes address is broadcast address"), 1822 NULL, 0, &hostzeroisbroadcast, 0, 1823 CTL_NET, PF_INET, IPPROTO_IP, 1824 IPCTL_HOSTZEROBROADCAST, CTL_EOL); 1825 #if NGIF > 0 1826 sysctl_createv(clog, 0, NULL, NULL, 1827 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1828 CTLTYPE_INT, "gifttl", 1829 SYSCTL_DESCR("Default TTL for a gif tunnel datagram"), 1830 NULL, 0, &ip_gif_ttl, 0, 1831 CTL_NET, PF_INET, IPPROTO_IP, 1832 IPCTL_GIF_TTL, CTL_EOL); 1833 #endif /* NGIF */ 1834 #ifndef IPNOPRIVPORTS 1835 sysctl_createv(clog, 0, NULL, NULL, 1836 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1837 CTLTYPE_INT, "lowportmin", 1838 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1839 "to assign"), 1840 sysctl_net_inet_ip_ports, 0, &lowportmin, 0, 1841 CTL_NET, PF_INET, IPPROTO_IP, 1842 IPCTL_LOWPORTMIN, CTL_EOL); 1843 sysctl_createv(clog, 0, NULL, NULL, 1844 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1845 CTLTYPE_INT, "lowportmax", 1846 SYSCTL_DESCR("Highest privileged ephemeral port number " 1847 "to assign"), 1848 sysctl_net_inet_ip_ports, 0, &lowportmax, 0, 1849 CTL_NET, PF_INET, IPPROTO_IP, 1850 IPCTL_LOWPORTMAX, CTL_EOL); 1851 #endif /* IPNOPRIVPORTS */ 1852 #if NGRE > 0 1853 sysctl_createv(clog, 0, NULL, NULL, 1854 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1855 CTLTYPE_INT, "grettl", 1856 SYSCTL_DESCR("Default TTL for a gre tunnel datagram"), 1857 NULL, 0, &ip_gre_ttl, 0, 1858 CTL_NET, PF_INET, IPPROTO_IP, 1859 IPCTL_GRE_TTL, CTL_EOL); 1860 #endif /* NGRE */ 1861 sysctl_createv(clog, 0, NULL, NULL, 1862 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1863 CTLTYPE_INT, "checkinterface", 1864 SYSCTL_DESCR("Enable receive side of Strong ES model " 1865 "from RFC1122"), 1866 NULL, 0, &ip_checkinterface, 0, 1867 CTL_NET, PF_INET, IPPROTO_IP, 1868 IPCTL_CHECKINTERFACE, CTL_EOL); 1869 sysctl_createv(clog, 0, NULL, NULL, 1870 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1871 CTLTYPE_INT, "random_id", 1872 SYSCTL_DESCR("Assign random ip_id values"), 1873 NULL, 0, &ip_do_randomid, 0, 1874 CTL_NET, PF_INET, IPPROTO_IP, 1875 IPCTL_RANDOMID, CTL_EOL); 1876 sysctl_createv(clog, 0, NULL, NULL, 1877 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1878 CTLTYPE_INT, "do_loopback_cksum", 1879 SYSCTL_DESCR("Perform IP checksum on loopback"), 1880 NULL, 0, &ip_do_loopback_cksum, 0, 1881 CTL_NET, PF_INET, IPPROTO_IP, 1882 IPCTL_LOOPBACKCKSUM, CTL_EOL); 1883 sysctl_createv(clog, 0, NULL, NULL, 1884 CTLFLAG_PERMANENT, 1885 CTLTYPE_STRUCT, "stats", 1886 SYSCTL_DESCR("IP statistics"), 1887 sysctl_net_inet_ip_stats, 0, NULL, 0, 1888 CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, 1889 CTL_EOL); 1890 1891 /* anonportalgo RFC6056 subtree */ 1892 const struct sysctlnode *portalgo_node; 1893 sysctl_createv(clog, 0, NULL, &portalgo_node, 1894 CTLFLAG_PERMANENT, 1895 CTLTYPE_NODE, "anonportalgo", 1896 SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"), 1897 NULL, 0, NULL, 0, 1898 CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL); 1899 sysctl_createv(clog, 0, &portalgo_node, NULL, 1900 CTLFLAG_PERMANENT, 1901 CTLTYPE_STRING, "available", 1902 SYSCTL_DESCR("available algorithms"), 1903 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1904 CTL_CREATE, CTL_EOL); 1905 sysctl_createv(clog, 0, &portalgo_node, NULL, 1906 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1907 CTLTYPE_STRING, "selected", 1908 SYSCTL_DESCR("selected algorithm"), 1909 sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN, 1910 CTL_CREATE, CTL_EOL); 1911 sysctl_createv(clog, 0, &portalgo_node, NULL, 1912 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1913 CTLTYPE_STRUCT, "reserve", 1914 SYSCTL_DESCR("bitmap of reserved ports"), 1915 sysctl_portalgo_reserve4, 0, NULL, 0, 1916 CTL_CREATE, CTL_EOL); 1917 } 1918 1919 void 1920 ip_statinc(u_int stat) 1921 { 1922 1923 KASSERT(stat < IP_NSTATS); 1924 IP_STATINC(stat); 1925 } 1926