1 /* $NetBSD: ip_input.c,v 1.406 2025/07/17 06:49:43 ozaki-r 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 1.406 2025/07/17 06:49:43 ozaki-r Exp $"); 95 96 #ifdef _KERNEL_OPT 97 #include "opt_inet.h" 98 #include "opt_gateway.h" 99 #include "opt_ipsec.h" 100 #include "opt_mrouting.h" 101 #include "opt_mbuftrace.h" 102 #include "opt_inet_csum.h" 103 #include "opt_net_mpsafe.h" 104 #endif 105 106 #include "arp.h" 107 108 #include <sys/param.h> 109 #include <sys/systm.h> 110 #include <sys/cpu.h> 111 #include <sys/mbuf.h> 112 #include <sys/domain.h> 113 #include <sys/protosw.h> 114 #include <sys/socket.h> 115 #include <sys/socketvar.h> 116 #include <sys/errno.h> 117 #include <sys/time.h> 118 #include <sys/kernel.h> 119 #include <sys/pool.h> 120 #include <sys/sysctl.h> 121 #include <sys/kauth.h> 122 123 #include <net/if.h> 124 #include <net/if_dl.h> 125 #include <net/if_types.h> 126 #include <net/route.h> 127 #include <net/pktqueue.h> 128 #include <net/pfil.h> 129 130 #include <netinet/in.h> 131 #include <netinet/in_systm.h> 132 #include <netinet/ip.h> 133 #include <netinet/in_pcb.h> 134 #include <netinet/in_proto.h> 135 #include <netinet/in_var.h> 136 #include <netinet/ip_var.h> 137 #include <netinet/ip_private.h> 138 #include <netinet/ip_icmp.h> 139 /* just for gif_ttl */ 140 #include <netinet/in_gif.h> 141 #include "gif.h" 142 #include <net/if_gre.h> 143 #include "gre.h" 144 145 #ifdef MROUTING 146 #include <netinet/ip_mroute.h> 147 #endif 148 #include <netinet/portalgo.h> 149 150 #ifdef IPSEC 151 #include <netipsec/ipsec.h> 152 #endif 153 154 #ifndef IPFORWARDING 155 #ifdef GATEWAY 156 #define IPFORWARDING 1 /* forward IP packets not for us */ 157 #else 158 #define IPFORWARDING 0 /* don't forward IP packets not for us */ 159 #endif 160 #endif 161 162 #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 163 164 int ipforwarding = IPFORWARDING; 165 int ipsendredirects = 1; 166 int ip_defttl = IPDEFTTL; 167 int ip_forwsrcrt = 0; 168 int ip_directedbcast = 0; 169 int ip_allowsrcrt = 0; 170 int ip_mtudisc = 1; 171 int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; 172 int ip_do_randomid = 1; 173 174 /* 175 * XXX - Setting ip_checkinterface mostly implements the receive side of 176 * the Strong ES model described in RFC 1122, but since the routing table 177 * and transmit implementation do not implement the Strong ES model, 178 * setting this to 1 results in an odd hybrid. 179 * 180 * XXX - ip_checkinterface currently must be disabled if you use NAT 181 * to translate the destination address to another local interface. 182 * 183 * XXX - ip_checkinterface must be disabled if you add IP aliases 184 * to the loopback interface instead of the interface where the 185 * packets for those addresses are received. 186 */ 187 static int ip_checkinterface __read_mostly = 0; 188 189 struct rttimer_queue *ip_mtudisc_timeout_q = NULL; 190 191 pktqueue_t * ip_pktq __read_mostly; 192 pfil_head_t * inet_pfil_hook __read_mostly; 193 percpu_t * ipstat_percpu __read_mostly; 194 195 static percpu_t *ipforward_rt_percpu __cacheline_aligned; 196 197 uint16_t ip_id; 198 199 #ifdef INET_CSUM_COUNTERS 200 #include <sys/device.h> 201 202 struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 203 NULL, "inet", "hwcsum bad"); 204 struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 205 NULL, "inet", "hwcsum ok"); 206 struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 207 NULL, "inet", "swcsum"); 208 209 #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 210 211 EVCNT_ATTACH_STATIC(ip_hwcsum_bad); 212 EVCNT_ATTACH_STATIC(ip_hwcsum_ok); 213 EVCNT_ATTACH_STATIC(ip_swcsum); 214 215 #else 216 217 #define INET_CSUM_COUNTER_INCR(ev) /* nothing */ 218 219 #endif /* INET_CSUM_COUNTERS */ 220 221 /* 222 * Used to save the IP options in case a protocol wants to respond 223 * to an incoming packet over the same route if the packet got here 224 * using IP source routing. This allows connection establishment and 225 * maintenance when the remote end is on a network that is not known 226 * to us. 227 */ 228 struct ip_srcrt { 229 int isr_nhops; /* number of hops */ 230 struct in_addr isr_dst; /* final destination */ 231 char isr_nop; /* one NOP to align */ 232 char isr_hdr[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN & OFFSET */ 233 struct in_addr isr_routes[MAX_IPOPTLEN/sizeof(struct in_addr)]; 234 }; 235 236 static int ip_drainwanted; 237 238 static void save_rte(struct mbuf *, u_char *, struct in_addr); 239 240 #ifdef MBUFTRACE 241 struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx"); 242 struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx"); 243 #endif 244 245 static void ipintr(void *); 246 static void ip_input(struct mbuf *, struct ifnet *); 247 static void ip_forward(struct mbuf *, int, struct ifnet *); 248 static bool ip_dooptions(struct mbuf *); 249 static int ip_rtaddr(struct in_addr, struct in_addr *); 250 static void sysctl_net_inet_ip_setup(struct sysctllog **); 251 252 static struct in_ifaddr *ip_match_our_address(struct ifnet *, struct ip *, 253 int *); 254 static struct in_ifaddr *ip_match_our_address_broadcast(struct ifnet *, 255 struct ip *); 256 257 #ifdef NET_MPSAFE 258 #define SOFTNET_LOCK() mutex_enter(softnet_lock) 259 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) 260 #else 261 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) 262 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) 263 #endif 264 265 /* 266 * IP initialization: fill in IP protocol switch table. 267 * All protocols not implemented in kernel go to raw IP protocol handler. 268 */ 269 void 270 ip_init(void) 271 { 272 const struct protosw *pr; 273 274 ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL); 275 KASSERT(ip_pktq != NULL); 276 277 in_init(); 278 sysctl_net_inet_ip_setup(NULL); 279 280 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 281 KASSERT(pr != NULL); 282 283 for (u_int i = 0; i < IPPROTO_MAX; i++) { 284 ip_protox[i] = pr - inetsw; 285 } 286 for (pr = inetdomain.dom_protosw; 287 pr < inetdomain.dom_protoswNPROTOSW; pr++) 288 if (pr->pr_domain->dom_family == PF_INET && 289 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 290 ip_protox[pr->pr_protocol] = pr - inetsw; 291 292 ip_reass_init(); 293 294 ip_id = time_uptime & 0xfffff; 295 296 #ifdef GATEWAY 297 ipflow_init(); 298 #endif 299 300 /* Register our Packet Filter hook. */ 301 inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET); 302 KASSERT(inet_pfil_hook != NULL); 303 304 #ifdef MBUFTRACE 305 MOWNER_ATTACH(&ip_tx_mowner); 306 MOWNER_ATTACH(&ip_rx_mowner); 307 #endif 308 309 ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS); 310 ipforward_rt_percpu = rtcache_percpu_alloc(); 311 ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); 312 } 313 314 static struct in_ifaddr * 315 ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch) 316 { 317 struct in_ifaddr *ia = NULL; 318 int checkif; 319 320 /* 321 * Enable a consistency check between the destination address 322 * and the arrival interface for a unicast packet (the RFC 1122 323 * strong ES model) if IP forwarding is disabled and the packet 324 * is not locally generated. 325 * 326 * XXX - We need to add a per ifaddr flag for this so that 327 * we get finer grain control. 328 */ 329 checkif = ip_checkinterface && (ipforwarding == 0) && 330 (ifp->if_flags & IFF_LOOPBACK) == 0; 331 332 IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) { 333 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 334 if (ia->ia4_flags & IN_IFF_NOTREADY) 335 continue; 336 if (checkif && ia->ia_ifp != ifp) 337 continue; 338 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) { 339 (*downmatch)++; 340 continue; 341 } 342 if (ia->ia4_flags & IN_IFF_DETACHED && 343 (ifp->if_flags & IFF_LOOPBACK) == 0) 344 continue; 345 break; 346 } 347 } 348 349 return ia; 350 } 351 352 static struct in_ifaddr * 353 ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip) 354 { 355 struct in_ifaddr *ia = NULL; 356 struct ifaddr *ifa; 357 358 IFADDR_READER_FOREACH(ifa, ifp) { 359 if (ifa->ifa_addr->sa_family != AF_INET) 360 continue; 361 ia = ifatoia(ifa); 362 if (ia->ia4_flags & IN_IFF_NOTREADY) 363 continue; 364 if (ia->ia4_flags & IN_IFF_DETACHED && 365 (ifp->if_flags & IFF_LOOPBACK) == 0) 366 continue; 367 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 368 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 369 /* 370 * Look for all-0's host part (old broadcast addr), 371 * either for subnet or net. 372 */ 373 ip->ip_dst.s_addr == ia->ia_subnet || 374 ip->ip_dst.s_addr == ia->ia_net) 375 goto matched; 376 /* 377 * An interface with IP address zero accepts 378 * all packets that arrive on that interface. 379 */ 380 if (in_nullhost(ia->ia_addr.sin_addr)) 381 goto matched; 382 } 383 ia = NULL; 384 385 matched: 386 return ia; 387 } 388 389 /* 390 * IP software interrupt routine. 391 */ 392 static void 393 ipintr(void *arg __unused) 394 { 395 struct mbuf *m; 396 397 KASSERT(cpu_softintr_p()); 398 399 SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); 400 while ((m = pktq_dequeue(ip_pktq)) != NULL) { 401 struct ifnet *ifp; 402 struct psref psref; 403 404 ifp = m_get_rcvif_psref(m, &psref); 405 if (__predict_false(ifp == NULL)) { 406 IP_STATINC(IP_STAT_IFDROP); 407 m_freem(m); 408 continue; 409 } 410 411 ip_input(m, ifp); 412 413 m_put_rcvif_psref(ifp, &psref); 414 } 415 SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 416 } 417 418 /* 419 * IP input routine. Checksum and byte swap header. If fragmented 420 * try to reassemble. Process options. Pass to next level. 421 */ 422 static void 423 ip_input(struct mbuf *m, struct ifnet *ifp) 424 { 425 struct ip *ip = NULL; 426 struct in_ifaddr *ia = NULL; 427 int hlen = 0, len; 428 int downmatch; 429 int srcrt = 0; 430 int s; 431 432 KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software " 433 "interrupt handler; synchronization assumptions violated"); 434 435 MCLAIM(m, &ip_rx_mowner); 436 KASSERT((m->m_flags & M_PKTHDR) != 0); 437 438 /* 439 * If no IP addresses have been set yet but the interfaces 440 * are receiving, can't do anything with incoming packets yet. 441 * Note: we pre-check without locks held. 442 */ 443 if (IN_ADDRLIST_READER_EMPTY()) { 444 IP_STATINC(IP_STAT_IFDROP); 445 goto out; 446 } 447 448 IP_STATINC(IP_STAT_TOTAL); 449 450 /* 451 * If the IP header is not aligned, slurp it up into a new 452 * mbuf with space for link headers, in the event we forward 453 * it. Otherwise, if it is aligned, make sure the entire 454 * base IP header is in the first mbuf of the chain. 455 */ 456 if (M_GET_ALIGNED_HDR(&m, struct ip, true) != 0) { 457 /* XXXJRT new stat, please */ 458 IP_STATINC(IP_STAT_TOOSMALL); 459 goto out; 460 } 461 ip = mtod(m, struct ip *); 462 if (ip->ip_v != IPVERSION) { 463 IP_STATINC(IP_STAT_BADVERS); 464 goto out; 465 } 466 hlen = ip->ip_hl << 2; 467 if (hlen < sizeof(struct ip)) { /* minimum header length */ 468 IP_STATINC(IP_STAT_BADHLEN); 469 goto out; 470 } 471 if (hlen > m->m_len) { 472 if ((m = m_pullup(m, hlen)) == NULL) { 473 IP_STATINC(IP_STAT_BADHLEN); 474 goto out; 475 } 476 ip = mtod(m, struct ip *); 477 } 478 479 /* 480 * RFC1122: packets with a multicast source address are 481 * not allowed. 482 */ 483 if (IN_MULTICAST(ip->ip_src.s_addr)) { 484 IP_STATINC(IP_STAT_BADADDR); 485 goto out; 486 } 487 488 /* 127/8 must not appear on wire - RFC1122 */ 489 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 490 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 491 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 492 IP_STATINC(IP_STAT_BADADDR); 493 goto out; 494 } 495 } 496 497 switch (m->m_pkthdr.csum_flags & 498 ((ifp->if_csum_flags_rx & M_CSUM_IPv4) | M_CSUM_IPv4_BAD)) { 499 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 500 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 501 IP_STATINC(IP_STAT_BADSUM); 502 goto out; 503 504 case M_CSUM_IPv4: 505 /* Checksum was okay. */ 506 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 507 break; 508 509 default: 510 /* 511 * Must compute it ourselves. Maybe skip checksum on 512 * loopback interfaces. 513 */ 514 if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) || 515 ip_do_loopback_cksum)) { 516 INET_CSUM_COUNTER_INCR(&ip_swcsum); 517 if (in_cksum(m, hlen) != 0) { 518 IP_STATINC(IP_STAT_BADSUM); 519 goto out; 520 } 521 } 522 break; 523 } 524 525 /* Retrieve the packet length. */ 526 len = ntohs(ip->ip_len); 527 528 /* 529 * Check for additional length bogosity 530 */ 531 if (len < hlen) { 532 IP_STATINC(IP_STAT_BADLEN); 533 goto out; 534 } 535 536 /* 537 * Check that the amount of data in the buffers is at least as much 538 * as the IP header would have us expect. Trim mbufs if longer than 539 * we expect. Drop packet if shorter than we expect. 540 */ 541 if (m->m_pkthdr.len < len) { 542 IP_STATINC(IP_STAT_TOOSHORT); 543 goto out; 544 } 545 if (m->m_pkthdr.len > len) { 546 if (m->m_len == m->m_pkthdr.len) { 547 m->m_len = len; 548 m->m_pkthdr.len = len; 549 } else 550 m_adj(m, len - m->m_pkthdr.len); 551 } 552 553 /* 554 * Assume that we can create a fast-forward IP flow entry 555 * based on this packet. 556 */ 557 m->m_flags |= M_CANFASTFWD; 558 559 /* 560 * Run through list of hooks for input packets. If there are any 561 * filters which require that additional packets in the flow are 562 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 563 * Note that filters must _never_ set this flag, as another filter 564 * in the list may have previously cleared it. 565 * 566 * Don't call hooks if the packet has already been processed by 567 * IPsec (encapsulated, tunnel mode). 568 */ 569 #if defined(IPSEC) 570 if (!ipsec_used || !ipsec_skip_pfil(m)) 571 #else 572 if (1) 573 #endif 574 { 575 struct in_addr odst = ip->ip_dst; 576 bool freed; 577 578 freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0; 579 if (freed || m == NULL) { 580 m = NULL; 581 IP_STATINC(IP_STAT_PFILDROP_IN); 582 goto out; 583 } 584 if (__predict_false(m->m_len < sizeof(struct ip))) { 585 if ((m = m_pullup(m, sizeof(struct ip))) == NULL) { 586 IP_STATINC(IP_STAT_TOOSMALL); 587 goto out; 588 } 589 } 590 ip = mtod(m, struct ip *); 591 hlen = ip->ip_hl << 2; 592 if (hlen < sizeof(struct ip)) { /* minimum header length */ 593 IP_STATINC(IP_STAT_BADHLEN); 594 goto out; 595 } 596 if (hlen > m->m_len) { 597 if ((m = m_pullup(m, hlen)) == NULL) { 598 IP_STATINC(IP_STAT_BADHLEN); 599 goto out; 600 } 601 ip = mtod(m, struct ip *); 602 } 603 604 /* 605 * XXX The setting of "srcrt" here is to prevent ip_forward() 606 * from generating ICMP redirects for packets that have 607 * been redirected by a hook back out on to the same LAN that 608 * they came from and is not an indication that the packet 609 * is being influenced by source routing options. This 610 * allows things like 611 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" 612 * where tlp0 is both on the 1.1.1.0/24 network and is the 613 * default route for hosts on 1.1.1.0/24. Of course this 614 * also requires a "map tlp0 ..." to complete the story. 615 * One might argue whether or not this kind of network config. 616 * should be supported in this manner... 617 */ 618 srcrt = (odst.s_addr != ip->ip_dst.s_addr); 619 } 620 621 #ifdef ALTQ 622 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 623 if (altq_input) { 624 SOFTNET_LOCK(); 625 if ((*altq_input)(m, AF_INET) == 0) { 626 /* Packet dropped by traffic conditioner. */ 627 SOFTNET_UNLOCK(); 628 m = NULL; 629 goto out; 630 } 631 SOFTNET_UNLOCK(); 632 } 633 #endif 634 635 /* 636 * Process options and, if not destined for us, 637 * ship it on. ip_dooptions returns 1 when an 638 * error was detected (causing an icmp message 639 * to be sent and the original packet to be freed). 640 */ 641 if (hlen > sizeof(struct ip) && ip_dooptions(m)) { 642 m = NULL; 643 goto out; 644 } 645 646 /* 647 * Check our list of addresses, to see if the packet is for us. 648 * 649 * Traditional 4.4BSD did not consult IFF_UP at all. 650 * The behavior here is to treat addresses on !IFF_UP interface 651 * or IN_IFF_NOTREADY addresses as not mine. 652 */ 653 downmatch = 0; 654 s = pserialize_read_enter(); 655 ia = ip_match_our_address(ifp, ip, &downmatch); 656 if (ia != NULL) { 657 pserialize_read_exit(s); 658 goto ours; 659 } 660 661 if (ifp->if_flags & IFF_BROADCAST) { 662 ia = ip_match_our_address_broadcast(ifp, ip); 663 if (ia != NULL) { 664 pserialize_read_exit(s); 665 goto ours; 666 } 667 } 668 pserialize_read_exit(s); 669 670 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 671 #ifdef MROUTING 672 extern struct socket *ip_mrouter; 673 674 if (ip_mrouter) { 675 /* 676 * If we are acting as a multicast router, all 677 * incoming multicast packets are passed to the 678 * kernel-level multicast forwarding function. 679 * The packet is returned (relatively) intact; if 680 * ip_mforward() returns a non-zero value, the packet 681 * must be discarded, else it may be accepted below. 682 * 683 * (The IP ident field is put in the same byte order 684 * as expected when ip_mforward() is called from 685 * ip_output().) 686 */ 687 SOFTNET_LOCK(); 688 if (ip_mforward(m, ifp) != 0) { 689 SOFTNET_UNLOCK(); 690 IP_STATINC(IP_STAT_CANTFORWARD); 691 goto out; 692 } 693 SOFTNET_UNLOCK(); 694 695 /* 696 * The process-level routing demon needs to receive 697 * all multicast IGMP packets, whether or not this 698 * host belongs to their destination groups. 699 */ 700 if (ip->ip_p == IPPROTO_IGMP) { 701 goto ours; 702 } 703 IP_STATINC(IP_STAT_CANTFORWARD); 704 } 705 #endif 706 /* 707 * See if we belong to the destination multicast group on the 708 * arrival interface. 709 */ 710 if (!in_multi_group(ip->ip_dst, ifp, 0)) { 711 IP_STATINC(IP_STAT_CANTFORWARD); 712 goto out; 713 } 714 goto ours; 715 } 716 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 717 in_nullhost(ip->ip_dst)) 718 goto ours; 719 720 /* 721 * Not for us; forward if possible and desirable. 722 */ 723 if (ipforwarding == 0) { 724 IP_STATINC(IP_STAT_CANTFORWARD); 725 m_freem(m); 726 } else { 727 /* 728 * If ip_dst matched any of my address on !IFF_UP interface, 729 * and there's no IFF_UP interface that matches ip_dst, 730 * send icmp unreach. Forwarding it will result in in-kernel 731 * forwarding loop till TTL goes to 0. 732 */ 733 if (downmatch) { 734 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 735 IP_STATINC(IP_STAT_CANTFORWARD); 736 return; 737 } 738 #ifdef IPSEC 739 /* Check the security policy (SP) for the packet */ 740 if (ipsec_used) { 741 if (ipsec_ip_input_checkpolicy(m, true) != 0) { 742 IP_STATINC(IP_STAT_IPSECDROP_IN); 743 goto out; 744 } 745 } 746 #endif 747 ip_forward(m, srcrt, ifp); 748 } 749 return; 750 751 ours: 752 /* 753 * If offset or IP_MF are set, must reassemble. 754 */ 755 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 756 /* 757 * Pass to IP reassembly mechanism. 758 */ 759 if (ip_reass_packet(&m) != 0) { 760 /* Failed; invalid fragment(s) or packet. */ 761 goto out; 762 } 763 if (m == NULL) { 764 /* More fragments should come; silently return. */ 765 goto out; 766 } 767 /* 768 * Reassembly is done, we have the final packet. 769 * Update cached data in local variable(s). 770 */ 771 ip = mtod(m, struct ip *); 772 hlen = ip->ip_hl << 2; 773 } 774 775 M_VERIFY_PACKET(m); 776 777 #ifdef IPSEC 778 /* 779 * Enforce IPsec policy checking if we are seeing last header. 780 * Note that we do not visit this with protocols with PCB layer 781 * code - like UDP/TCP/raw IP. 782 */ 783 if (ipsec_used && 784 (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { 785 if (ipsec_ip_input_checkpolicy(m, false) != 0) { 786 IP_STATINC(IP_STAT_IPSECDROP_IN); 787 goto out; 788 } 789 } 790 #endif 791 792 /* 793 * Switch out to protocol's input routine. 794 */ 795 #if IFA_STATS 796 if (ia) { 797 struct in_ifaddr *_ia; 798 /* 799 * Keep a reference from ip_match_our_address with psref 800 * is expensive, so explore ia here again. 801 */ 802 s = pserialize_read_enter(); 803 _ia = in_get_ia(ip->ip_dst); 804 _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 805 pserialize_read_exit(s); 806 } 807 #endif 808 IP_STATINC(IP_STAT_DELIVERED); 809 810 const int off = hlen, nh = ip->ip_p; 811 812 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 813 return; 814 815 out: 816 m_freem(m); 817 } 818 819 /* 820 * IP timer processing. 821 */ 822 void 823 ip_slowtimo(void) 824 { 825 826 SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); 827 828 ip_reass_slowtimo(); 829 830 SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 831 } 832 833 /* 834 * IP drain processing. 835 */ 836 void 837 ip_drain(void) 838 { 839 840 KERNEL_LOCK(1, NULL); 841 ip_reass_drain(); 842 KERNEL_UNLOCK_ONE(NULL); 843 } 844 845 /* 846 * ip_dooptions: perform option processing on a datagram, possibly discarding 847 * it if bad options are encountered, or forwarding it if source-routed. 848 * 849 * => Returns true if packet has been forwarded/freed. 850 * => Returns false if the packet should be processed further. 851 */ 852 static bool 853 ip_dooptions(struct mbuf *m) 854 { 855 struct ip *ip = mtod(m, struct ip *); 856 u_char *cp, *cp0; 857 struct ip_timestamp *ipt; 858 struct in_ifaddr *ia; 859 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 860 int srr_present, rr_present, ts_present; 861 struct in_addr dst; 862 n_time ntime; 863 struct ifaddr *ifa = NULL; 864 int s; 865 866 srr_present = 0; 867 rr_present = 0; 868 ts_present = 0; 869 870 dst = ip->ip_dst; 871 cp = (u_char *)(ip + 1); 872 cnt = (ip->ip_hl << 2) - sizeof(struct ip); 873 for (; cnt > 0; cnt -= optlen, cp += optlen) { 874 opt = cp[IPOPT_OPTVAL]; 875 if (opt == IPOPT_EOL) 876 break; 877 if (opt == IPOPT_NOP) 878 optlen = 1; 879 else { 880 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 881 code = &cp[IPOPT_OLEN] - (u_char *)ip; 882 goto bad; 883 } 884 optlen = cp[IPOPT_OLEN]; 885 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 886 code = &cp[IPOPT_OLEN] - (u_char *)ip; 887 goto bad; 888 } 889 } 890 switch (opt) { 891 892 default: 893 break; 894 895 /* 896 * Source routing with record. 897 * Find interface with current destination address. 898 * If none on this machine then drop if strictly routed, 899 * or do nothing if loosely routed. 900 * Record interface address and bring up next address 901 * component. If strictly routed make sure next 902 * address is on directly accessible net. 903 */ 904 case IPOPT_LSRR: 905 case IPOPT_SSRR: { 906 struct sockaddr_in ipaddr = { 907 .sin_len = sizeof(ipaddr), 908 .sin_family = AF_INET, 909 }; 910 911 if (ip_allowsrcrt == 0) { 912 type = ICMP_UNREACH; 913 code = ICMP_UNREACH_NET_PROHIB; 914 goto bad; 915 } 916 if (srr_present++) { 917 code = &cp[IPOPT_OPTVAL] - (u_char *)ip; 918 goto bad; 919 } 920 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 921 code = &cp[IPOPT_OLEN] - (u_char *)ip; 922 goto bad; 923 } 924 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 925 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 926 goto bad; 927 } 928 ipaddr.sin_addr = ip->ip_dst; 929 930 s = pserialize_read_enter(); 931 ifa = ifa_ifwithaddr(sintosa(&ipaddr)); 932 if (ifa == NULL) { 933 pserialize_read_exit(s); 934 if (opt == IPOPT_SSRR) { 935 type = ICMP_UNREACH; 936 code = ICMP_UNREACH_SRCFAIL; 937 goto bad; 938 } 939 /* 940 * Loose routing, and not at next destination 941 * yet; nothing to do except forward. 942 */ 943 break; 944 } 945 pserialize_read_exit(s); 946 947 off--; /* 0 origin */ 948 if ((off + sizeof(struct in_addr)) > optlen) { 949 /* 950 * End of source route. Should be for us. 951 */ 952 save_rte(m, cp, ip->ip_src); 953 break; 954 } 955 /* 956 * locate outgoing interface 957 */ 958 memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), 959 sizeof(ipaddr.sin_addr)); 960 int error = -1; 961 if (opt == IPOPT_SSRR) { 962 s = pserialize_read_enter(); 963 ifa = ifa_ifwithladdr(sintosa(&ipaddr)); 964 if (ifa != NULL) { 965 ia = ifatoia(ifa); 966 memcpy(cp + off, &ia->ia_addr.sin_addr, 967 sizeof(struct in_addr)); 968 error = 0; 969 } 970 pserialize_read_exit(s); 971 } else { 972 struct in_addr addr; 973 error = ip_rtaddr(ipaddr.sin_addr, &addr); 974 if (error == 0) 975 memcpy(cp + off, &addr, sizeof(addr)); 976 } 977 if (error != 0) { 978 type = ICMP_UNREACH; 979 code = ICMP_UNREACH_SRCFAIL; 980 goto bad; 981 } 982 ip->ip_dst = ipaddr.sin_addr; 983 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 984 /* 985 * Let ip_intr's mcast routing check handle mcast pkts 986 */ 987 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 988 break; 989 } 990 991 case IPOPT_RR: { 992 struct sockaddr_in ipaddr = { 993 .sin_len = sizeof(ipaddr), 994 .sin_family = AF_INET, 995 }; 996 997 if (rr_present++) { 998 code = &cp[IPOPT_OPTVAL] - (u_char *)ip; 999 goto bad; 1000 } 1001 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1002 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1003 goto bad; 1004 } 1005 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1006 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1007 goto bad; 1008 } 1009 /* 1010 * If no space remains, ignore. 1011 */ 1012 off--; /* 0 origin */ 1013 if ((off + sizeof(struct in_addr)) > optlen) 1014 break; 1015 memcpy((void *)&ipaddr.sin_addr, (void *)&ip->ip_dst, 1016 sizeof(ipaddr.sin_addr)); 1017 /* 1018 * locate outgoing interface; if we're the destination, 1019 * use the incoming interface (should be same). 1020 */ 1021 s = pserialize_read_enter(); 1022 ifa = ifa_ifwithaddr(sintosa(&ipaddr)); 1023 if (ifa != NULL) { 1024 ia = ifatoia(ifa); 1025 memcpy(cp + off, &ia->ia_addr.sin_addr, 1026 sizeof(struct in_addr)); 1027 pserialize_read_exit(s); 1028 } else { 1029 struct in_addr addr; 1030 int error; 1031 pserialize_read_exit(s); 1032 1033 error = ip_rtaddr(ipaddr.sin_addr, &addr); 1034 if (error != 0) { 1035 type = ICMP_UNREACH; 1036 code = ICMP_UNREACH_HOST; 1037 goto bad; 1038 } 1039 memcpy(cp + off, &addr, sizeof(addr)); 1040 } 1041 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1042 break; 1043 } 1044 1045 case IPOPT_TS: 1046 code = cp - (u_char *)ip; 1047 ipt = (struct ip_timestamp *)cp; 1048 if (ts_present++) { 1049 code = &cp[IPOPT_OPTVAL] - (u_char *)ip; 1050 goto bad; 1051 } 1052 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1053 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1054 goto bad; 1055 } 1056 if (ipt->ipt_ptr < 5) { 1057 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1058 goto bad; 1059 } 1060 if (ipt->ipt_ptr > ipt->ipt_len - sizeof(int32_t)) { 1061 if (++ipt->ipt_oflw == 0) { 1062 code = (u_char *)&ipt->ipt_ptr - 1063 (u_char *)ip; 1064 goto bad; 1065 } 1066 break; 1067 } 1068 cp0 = (cp + ipt->ipt_ptr - 1); 1069 switch (ipt->ipt_flg) { 1070 1071 case IPOPT_TS_TSONLY: 1072 break; 1073 1074 case IPOPT_TS_TSANDADDR: { 1075 struct ifnet *rcvif; 1076 int _s, _ss; 1077 struct sockaddr_in ipaddr = { 1078 .sin_len = sizeof(ipaddr), 1079 .sin_family = AF_INET, 1080 }; 1081 1082 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1083 sizeof(struct in_addr) > ipt->ipt_len) { 1084 code = (u_char *)&ipt->ipt_ptr - 1085 (u_char *)ip; 1086 goto bad; 1087 } 1088 ipaddr.sin_addr = dst; 1089 _ss = pserialize_read_enter(); 1090 rcvif = m_get_rcvif(m, &_s); 1091 if (__predict_true(rcvif != NULL)) { 1092 ifa = ifaof_ifpforaddr(sintosa(&ipaddr), 1093 rcvif); 1094 } 1095 m_put_rcvif(rcvif, &_s); 1096 if (ifa == NULL) { 1097 pserialize_read_exit(_ss); 1098 break; 1099 } 1100 ia = ifatoia(ifa); 1101 memcpy(cp0, &ia->ia_addr.sin_addr, 1102 sizeof(struct in_addr)); 1103 pserialize_read_exit(_ss); 1104 ipt->ipt_ptr += sizeof(struct in_addr); 1105 break; 1106 } 1107 1108 case IPOPT_TS_PRESPEC: { 1109 struct sockaddr_in ipaddr = { 1110 .sin_len = sizeof(ipaddr), 1111 .sin_family = AF_INET, 1112 }; 1113 1114 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1115 sizeof(struct in_addr) > ipt->ipt_len) { 1116 code = (u_char *)&ipt->ipt_ptr - 1117 (u_char *)ip; 1118 goto bad; 1119 } 1120 memcpy(&ipaddr.sin_addr, cp0, 1121 sizeof(struct in_addr)); 1122 s = pserialize_read_enter(); 1123 ifa = ifa_ifwithaddr(sintosa(&ipaddr)); 1124 if (ifa == NULL) { 1125 pserialize_read_exit(s); 1126 continue; 1127 } 1128 pserialize_read_exit(s); 1129 ipt->ipt_ptr += sizeof(struct in_addr); 1130 break; 1131 } 1132 1133 default: 1134 /* XXX can't take &ipt->ipt_flg */ 1135 code = (u_char *)&ipt->ipt_ptr - 1136 (u_char *)ip + 1; 1137 goto bad; 1138 } 1139 ntime = iptime(); 1140 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1141 memmove((char *)cp + ipt->ipt_ptr - 1, cp0, 1142 sizeof(n_time)); 1143 ipt->ipt_ptr += sizeof(n_time); 1144 } 1145 } 1146 if (forward) { 1147 struct ifnet *rcvif; 1148 struct psref _psref; 1149 1150 if (ip_forwsrcrt == 0) { 1151 type = ICMP_UNREACH; 1152 code = ICMP_UNREACH_SRCFAIL; 1153 goto bad; 1154 } 1155 1156 rcvif = m_get_rcvif_psref(m, &_psref); 1157 if (__predict_false(rcvif == NULL)) { 1158 type = ICMP_UNREACH; 1159 code = ICMP_UNREACH_HOST; 1160 goto bad; 1161 } 1162 ip_forward(m, 1, rcvif); 1163 m_put_rcvif_psref(rcvif, &_psref); 1164 return true; 1165 } 1166 return false; 1167 bad: 1168 icmp_error(m, type, code, 0, 0); 1169 IP_STATINC(IP_STAT_BADOPTIONS); 1170 return true; 1171 } 1172 1173 /* 1174 * ip_rtaddr: given address of next destination (final or next hop), 1175 * return internet address of interface to be used to get there. 1176 */ 1177 static int 1178 ip_rtaddr(struct in_addr dst, struct in_addr *ret) 1179 { 1180 struct rtentry *rt; 1181 union { 1182 struct sockaddr dst; 1183 struct sockaddr_in dst4; 1184 } u; 1185 struct route *ro; 1186 struct in_ifaddr *ia; 1187 1188 sockaddr_in_init(&u.dst4, &dst, 0); 1189 1190 ro = rtcache_percpu_getref(ipforward_rt_percpu); 1191 rt = rtcache_lookup(ro, &u.dst); 1192 if (rt == NULL) { 1193 rtcache_percpu_putref(ipforward_rt_percpu); 1194 return -1; 1195 } 1196 1197 ia = ifatoia(rt->rt_ifa); 1198 *ret = ia->ia_addr.sin_addr; 1199 rtcache_unref(rt, ro); 1200 rtcache_percpu_putref(ipforward_rt_percpu); 1201 1202 return 0; 1203 } 1204 1205 /* 1206 * save_rte: save incoming source route for use in replies, to be picked 1207 * up later by ip_srcroute if the receiver is interested. 1208 */ 1209 static void 1210 save_rte(struct mbuf *m, u_char *option, struct in_addr dst) 1211 { 1212 struct ip_srcrt *isr; 1213 struct m_tag *mtag; 1214 unsigned olen; 1215 1216 olen = option[IPOPT_OLEN]; 1217 if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes)) 1218 return; 1219 1220 mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT); 1221 if (mtag == NULL) 1222 return; 1223 isr = (struct ip_srcrt *)(mtag + 1); 1224 1225 memcpy(isr->isr_hdr, option, olen); 1226 isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1227 isr->isr_dst = dst; 1228 m_tag_prepend(m, mtag); 1229 } 1230 1231 /* 1232 * Retrieve incoming source route for use in replies, 1233 * in the same form used by setsockopt. 1234 * The first hop is placed before the options, will be removed later. 1235 */ 1236 struct mbuf * 1237 ip_srcroute(struct mbuf *m0) 1238 { 1239 struct in_addr *p, *q; 1240 struct mbuf *m; 1241 struct ip_srcrt *isr; 1242 struct m_tag *mtag; 1243 1244 mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE); 1245 if (mtag == NULL) 1246 return NULL; 1247 isr = (struct ip_srcrt *)(mtag + 1); 1248 1249 if (isr->isr_nhops == 0) 1250 return NULL; 1251 1252 m = m_get(M_DONTWAIT, MT_SOOPTS); 1253 if (m == NULL) 1254 return NULL; 1255 1256 MCLAIM(m, &inetdomain.dom_mowner); 1257 #define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr)) 1258 1259 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */ 1260 m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ; 1261 1262 /* 1263 * First save first hop for return route 1264 */ 1265 p = &(isr->isr_routes[isr->isr_nhops - 1]); 1266 *(mtod(m, struct in_addr *)) = *p--; 1267 1268 /* 1269 * Copy option fields and padding (nop) to mbuf. 1270 */ 1271 isr->isr_nop = IPOPT_NOP; 1272 isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF; 1273 memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop, 1274 OPTSIZ); 1275 q = (struct in_addr *)(mtod(m, char *) + 1276 sizeof(struct in_addr) + OPTSIZ); 1277 #undef OPTSIZ 1278 /* 1279 * Record return path as an IP source route, 1280 * reversing the path (pointers are now aligned). 1281 */ 1282 while (p >= isr->isr_routes) { 1283 *q++ = *p--; 1284 } 1285 /* 1286 * Last hop goes to final destination. 1287 */ 1288 *q = isr->isr_dst; 1289 m_tag_delete(m0, mtag); 1290 return m; 1291 } 1292 1293 const int inetctlerrmap[PRC_NCMDS] = { 1294 [PRC_MSGSIZE] = EMSGSIZE, 1295 [PRC_HOSTDEAD] = EHOSTDOWN, 1296 [PRC_HOSTUNREACH] = EHOSTUNREACH, 1297 [PRC_UNREACH_NET] = EHOSTUNREACH, 1298 [PRC_UNREACH_HOST] = EHOSTUNREACH, 1299 [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, 1300 [PRC_UNREACH_PORT] = ECONNREFUSED, 1301 [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, 1302 [PRC_PARAMPROB] = ENOPROTOOPT, 1303 }; 1304 1305 void 1306 ip_fasttimo(void) 1307 { 1308 if (ip_drainwanted) { 1309 ip_drain(); 1310 ip_drainwanted = 0; 1311 } 1312 } 1313 1314 void 1315 ip_drainstub(void) 1316 { 1317 ip_drainwanted = 1; 1318 } 1319 1320 /* 1321 * Forward a packet. If some error occurs return the sender 1322 * an icmp packet. Note we can't always generate a meaningful 1323 * icmp message because icmp doesn't have a large enough repertoire 1324 * of codes and types. 1325 * 1326 * If not forwarding, just drop the packet. This could be confusing 1327 * if ipforwarding was zero but some routing protocol was advancing 1328 * us as a gateway to somewhere. However, we must let the routing 1329 * protocol deal with that. 1330 * 1331 * The srcrt parameter indicates whether the packet is being forwarded 1332 * via a source route. 1333 */ 1334 static void 1335 ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif) 1336 { 1337 struct ip *ip = mtod(m, struct ip *); 1338 struct rtentry *rt; 1339 int error, type = 0, code = 0, destmtu = 0; 1340 struct mbuf *mcopy; 1341 n_long dest; 1342 union { 1343 struct sockaddr dst; 1344 struct sockaddr_in dst4; 1345 } u; 1346 net_stat_ref_t ips; 1347 struct route *ro; 1348 1349 KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software " 1350 "interrupt handler; synchronization assumptions violated"); 1351 1352 /* 1353 * We are now in the output path. 1354 */ 1355 MCLAIM(m, &ip_tx_mowner); 1356 1357 /* 1358 * Clear any in-bound checksum flags for this packet. 1359 */ 1360 m->m_pkthdr.csum_flags = 0; 1361 1362 dest = 0; 1363 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1364 IP_STATINC(IP_STAT_CANTFORWARD); 1365 m_freem(m); 1366 return; 1367 } 1368 1369 if (ip->ip_ttl <= IPTTLDEC) { 1370 IP_STATINC(IP_STAT_TIMXCEED); 1371 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1372 return; 1373 } 1374 1375 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1376 1377 ro = rtcache_percpu_getref(ipforward_rt_percpu); 1378 rt = rtcache_lookup(ro, &u.dst); 1379 if (rt == NULL) { 1380 rtcache_percpu_putref(ipforward_rt_percpu); 1381 IP_STATINC(IP_STAT_NOROUTE); 1382 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); 1383 return; 1384 } 1385 #ifdef NET_MPSAFE 1386 /* 1387 * XXX workaround an inconsistency issue between address and route on 1388 * address initialization to avoid packet looping. See doc/TODO.smpnet. 1389 */ 1390 if (__predict_false(rt->rt_ifp->if_type == IFT_LOOP)) { 1391 rtcache_unref(rt, ro); 1392 rtcache_percpu_putref(ipforward_rt_percpu); 1393 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 1394 IP_STATINC(IP_STAT_CANTFORWARD); 1395 return; 1396 } 1397 #endif 1398 1399 /* 1400 * Save at most 68 bytes of the packet in case 1401 * we need to generate an ICMP message to the src. 1402 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1403 */ 1404 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1405 if (mcopy) 1406 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1407 1408 ip->ip_ttl -= IPTTLDEC; 1409 1410 /* 1411 * If forwarding packet using same interface that it came in on, 1412 * perhaps should send a redirect to sender to shortcut a hop. 1413 * Only send redirect if source is sending directly to us, 1414 * and if packet was not source routed (or has any options). 1415 * Also, don't send redirect if forwarding using a default route 1416 * or a route modified by a redirect. 1417 */ 1418 if (rt->rt_ifp == rcvif && 1419 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1420 !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && 1421 ipsendredirects && !srcrt) { 1422 if ((ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1423 ifatoia(rt->rt_ifa)->ia_subnet) { 1424 if (rt->rt_flags & RTF_GATEWAY) 1425 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1426 else 1427 dest = ip->ip_dst.s_addr; 1428 /* 1429 * Router requirements says to only send host 1430 * redirects. 1431 */ 1432 type = ICMP_REDIRECT; 1433 code = ICMP_REDIRECT_HOST; 1434 } 1435 } 1436 rtcache_unref(rt, ro); 1437 1438 error = ip_output(m, NULL, ro, 1439 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 1440 NULL, NULL); 1441 1442 if (error) { 1443 IP_STATINC(IP_STAT_CANTFORWARD); 1444 goto error; 1445 } 1446 1447 ips = IP_STAT_GETREF(); 1448 _NET_STATINC_REF(ips, IP_STAT_FORWARD); 1449 1450 if (type) { 1451 _NET_STATINC_REF(ips, IP_STAT_REDIRECTSENT); 1452 IP_STAT_PUTREF(); 1453 goto redirect; 1454 } 1455 1456 IP_STAT_PUTREF(); 1457 if (mcopy) { 1458 #ifdef GATEWAY 1459 if (mcopy->m_flags & M_CANFASTFWD) 1460 ipflow_create(ro, mcopy); 1461 #endif 1462 m_freem(mcopy); 1463 } 1464 1465 rtcache_percpu_putref(ipforward_rt_percpu); 1466 return; 1467 1468 redirect: 1469 error: 1470 if (mcopy == NULL) { 1471 rtcache_percpu_putref(ipforward_rt_percpu); 1472 return; 1473 } 1474 1475 switch (error) { 1476 1477 case 0: /* forwarded, but need redirect */ 1478 /* type, code set above */ 1479 break; 1480 1481 case ENETUNREACH: /* shouldn't happen, checked above */ 1482 case EHOSTUNREACH: 1483 case ENETDOWN: 1484 case EHOSTDOWN: 1485 default: 1486 type = ICMP_UNREACH; 1487 code = ICMP_UNREACH_HOST; 1488 break; 1489 1490 case EMSGSIZE: 1491 type = ICMP_UNREACH; 1492 code = ICMP_UNREACH_NEEDFRAG; 1493 1494 if ((rt = rtcache_validate(ro)) != NULL) { 1495 destmtu = rt->rt_ifp->if_mtu; 1496 rtcache_unref(rt, ro); 1497 } 1498 #ifdef IPSEC 1499 if (ipsec_used) 1500 ipsec_mtu(mcopy, &destmtu); 1501 #endif 1502 IP_STATINC(IP_STAT_CANTFRAG); 1503 break; 1504 1505 case ENOBUFS: 1506 /* 1507 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812, 1508 * Requirements for IP Version 4 Routers. Source quench can 1509 * be a big problem under DoS attacks or if the underlying 1510 * interface is rate-limited. 1511 */ 1512 m_freem(mcopy); 1513 rtcache_percpu_putref(ipforward_rt_percpu); 1514 return; 1515 } 1516 icmp_error(mcopy, type, code, dest, destmtu); 1517 rtcache_percpu_putref(ipforward_rt_percpu); 1518 } 1519 1520 void 1521 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1522 struct mbuf *m) 1523 { 1524 struct socket *so = inp->inp_socket; 1525 int inpflags = inp->inp_flags; 1526 1527 if (SOOPT_TIMESTAMP(so->so_options)) 1528 mp = sbsavetimestamp(so->so_options, mp); 1529 1530 if (inpflags & INP_RECVDSTADDR) { 1531 *mp = sbcreatecontrol(&ip->ip_dst, 1532 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1533 if (*mp) 1534 mp = &(*mp)->m_next; 1535 } 1536 1537 if (inpflags & INP_RECVTTL) { 1538 *mp = sbcreatecontrol(&ip->ip_ttl, 1539 sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); 1540 if (*mp) 1541 mp = &(*mp)->m_next; 1542 } 1543 1544 struct psref psref; 1545 ifnet_t *ifp = m_get_rcvif_psref(m, &psref); 1546 if (__predict_false(ifp == NULL)) { 1547 #ifdef DIAGNOSTIC 1548 printf("%s: missing receive interface\n", __func__); 1549 #endif 1550 return; /* XXX should report error? */ 1551 } 1552 1553 if (inpflags & INP_RECVPKTINFO) { 1554 struct in_pktinfo ipi; 1555 ipi.ipi_addr = ip->ip_dst; 1556 ipi.ipi_ifindex = ifp->if_index; 1557 *mp = sbcreatecontrol(&ipi, 1558 sizeof(ipi), IP_PKTINFO, IPPROTO_IP); 1559 if (*mp) 1560 mp = &(*mp)->m_next; 1561 } 1562 if (inpflags & INP_RECVIF) { 1563 struct sockaddr_dl sdl; 1564 1565 sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0, 1566 NULL, 0); 1567 *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); 1568 if (*mp) 1569 mp = &(*mp)->m_next; 1570 } 1571 m_put_rcvif_psref(ifp, &psref); 1572 } 1573 1574 /* 1575 * sysctl helper routine for net.inet.ip.forwsrcrt. 1576 */ 1577 static int 1578 sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) 1579 { 1580 int error, tmp; 1581 struct sysctlnode node; 1582 1583 node = *rnode; 1584 tmp = ip_forwsrcrt; 1585 node.sysctl_data = &tmp; 1586 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1587 if (error || newp == NULL) 1588 return (error); 1589 1590 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, 1591 0, NULL, NULL, NULL); 1592 if (error) 1593 return (error); 1594 1595 ip_forwsrcrt = tmp; 1596 1597 return (0); 1598 } 1599 1600 /* 1601 * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the 1602 * range of the new value and tweaks timers if it changes. 1603 */ 1604 static int 1605 sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) 1606 { 1607 int error, tmp; 1608 struct sysctlnode node; 1609 1610 icmp_mtudisc_lock(); 1611 1612 node = *rnode; 1613 tmp = ip_mtudisc_timeout; 1614 node.sysctl_data = &tmp; 1615 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1616 if (error || newp == NULL) 1617 goto out; 1618 if (tmp < 0) { 1619 error = EINVAL; 1620 goto out; 1621 } 1622 1623 ip_mtudisc_timeout = tmp; 1624 rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); 1625 error = 0; 1626 out: 1627 icmp_mtudisc_unlock(); 1628 return error; 1629 } 1630 1631 static int 1632 sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) 1633 { 1634 1635 return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); 1636 } 1637 1638 static void 1639 sysctl_net_inet_ip_setup(struct sysctllog **clog) 1640 { 1641 const struct sysctlnode *ip_node; 1642 1643 sysctl_createv(clog, 0, NULL, NULL, 1644 CTLFLAG_PERMANENT, 1645 CTLTYPE_NODE, "inet", 1646 SYSCTL_DESCR("PF_INET related settings"), 1647 NULL, 0, NULL, 0, 1648 CTL_NET, PF_INET, CTL_EOL); 1649 sysctl_createv(clog, 0, NULL, &ip_node, 1650 CTLFLAG_PERMANENT, 1651 CTLTYPE_NODE, "ip", 1652 SYSCTL_DESCR("IPv4 related settings"), 1653 NULL, 0, NULL, 0, 1654 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 1655 1656 sysctl_createv(clog, 0, NULL, NULL, 1657 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1658 CTLTYPE_INT, "forwarding", 1659 SYSCTL_DESCR("Enable forwarding of INET datagrams"), 1660 NULL, 0, &ipforwarding, 0, 1661 CTL_NET, PF_INET, IPPROTO_IP, 1662 IPCTL_FORWARDING, CTL_EOL); 1663 sysctl_createv(clog, 0, NULL, NULL, 1664 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1665 CTLTYPE_INT, "redirect", 1666 SYSCTL_DESCR("Enable sending of ICMP redirect messages"), 1667 NULL, 0, &ipsendredirects, 0, 1668 CTL_NET, PF_INET, IPPROTO_IP, 1669 IPCTL_SENDREDIRECTS, CTL_EOL); 1670 sysctl_createv(clog, 0, NULL, NULL, 1671 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1672 CTLTYPE_INT, "ttl", 1673 SYSCTL_DESCR("Default TTL for an INET datagram"), 1674 NULL, 0, &ip_defttl, 0, 1675 CTL_NET, PF_INET, IPPROTO_IP, 1676 IPCTL_DEFTTL, CTL_EOL); 1677 sysctl_createv(clog, 0, NULL, NULL, 1678 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1679 CTLTYPE_INT, "forwsrcrt", 1680 SYSCTL_DESCR("Enable forwarding of source-routed " 1681 "datagrams"), 1682 sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, 1683 CTL_NET, PF_INET, IPPROTO_IP, 1684 IPCTL_FORWSRCRT, CTL_EOL); 1685 sysctl_createv(clog, 0, NULL, NULL, 1686 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1687 CTLTYPE_INT, "directed-broadcast", 1688 SYSCTL_DESCR("Enable forwarding of broadcast datagrams"), 1689 NULL, 0, &ip_directedbcast, 0, 1690 CTL_NET, PF_INET, IPPROTO_IP, 1691 IPCTL_DIRECTEDBCAST, CTL_EOL); 1692 sysctl_createv(clog, 0, NULL, NULL, 1693 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1694 CTLTYPE_INT, "allowsrcrt", 1695 SYSCTL_DESCR("Accept source-routed datagrams"), 1696 NULL, 0, &ip_allowsrcrt, 0, 1697 CTL_NET, PF_INET, IPPROTO_IP, 1698 IPCTL_ALLOWSRCRT, CTL_EOL); 1699 1700 sysctl_createv(clog, 0, NULL, NULL, 1701 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1702 CTLTYPE_INT, "mtudisc", 1703 SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"), 1704 NULL, 0, &ip_mtudisc, 0, 1705 CTL_NET, PF_INET, IPPROTO_IP, 1706 IPCTL_MTUDISC, CTL_EOL); 1707 sysctl_createv(clog, 0, NULL, NULL, 1708 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1709 CTLTYPE_INT, "anonportmin", 1710 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1711 sysctl_net_inet_ip_ports, 0, &anonportmin, 0, 1712 CTL_NET, PF_INET, IPPROTO_IP, 1713 IPCTL_ANONPORTMIN, CTL_EOL); 1714 sysctl_createv(clog, 0, NULL, NULL, 1715 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1716 CTLTYPE_INT, "anonportmax", 1717 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1718 sysctl_net_inet_ip_ports, 0, &anonportmax, 0, 1719 CTL_NET, PF_INET, IPPROTO_IP, 1720 IPCTL_ANONPORTMAX, CTL_EOL); 1721 sysctl_createv(clog, 0, NULL, NULL, 1722 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1723 CTLTYPE_INT, "mtudisctimeout", 1724 SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"), 1725 sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0, 1726 CTL_NET, PF_INET, IPPROTO_IP, 1727 IPCTL_MTUDISCTIMEOUT, CTL_EOL); 1728 #ifndef IPNOPRIVPORTS 1729 sysctl_createv(clog, 0, NULL, NULL, 1730 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1731 CTLTYPE_INT, "lowportmin", 1732 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1733 "to assign"), 1734 sysctl_net_inet_ip_ports, 0, &lowportmin, 0, 1735 CTL_NET, PF_INET, IPPROTO_IP, 1736 IPCTL_LOWPORTMIN, CTL_EOL); 1737 sysctl_createv(clog, 0, NULL, NULL, 1738 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1739 CTLTYPE_INT, "lowportmax", 1740 SYSCTL_DESCR("Highest privileged ephemeral port number " 1741 "to assign"), 1742 sysctl_net_inet_ip_ports, 0, &lowportmax, 0, 1743 CTL_NET, PF_INET, IPPROTO_IP, 1744 IPCTL_LOWPORTMAX, CTL_EOL); 1745 #endif /* IPNOPRIVPORTS */ 1746 #if NGRE > 0 1747 sysctl_createv(clog, 0, NULL, NULL, 1748 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1749 CTLTYPE_INT, "grettl", 1750 SYSCTL_DESCR("Default TTL for a gre tunnel datagram"), 1751 NULL, 0, &ip_gre_ttl, 0, 1752 CTL_NET, PF_INET, IPPROTO_IP, 1753 IPCTL_GRE_TTL, CTL_EOL); 1754 #endif /* NGRE */ 1755 sysctl_createv(clog, 0, NULL, NULL, 1756 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1757 CTLTYPE_INT, "checkinterface", 1758 SYSCTL_DESCR("Enable receive side of Strong ES model " 1759 "from RFC1122"), 1760 NULL, 0, &ip_checkinterface, 0, 1761 CTL_NET, PF_INET, IPPROTO_IP, 1762 IPCTL_CHECKINTERFACE, CTL_EOL); 1763 1764 pktq_sysctl_setup(ip_pktq, clog, ip_node, IPCTL_IFQ); 1765 1766 sysctl_createv(clog, 0, NULL, NULL, 1767 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1768 CTLTYPE_INT, "random_id", 1769 SYSCTL_DESCR("Assign random ip_id values"), 1770 NULL, 0, &ip_do_randomid, 0, 1771 CTL_NET, PF_INET, IPPROTO_IP, 1772 IPCTL_RANDOMID, CTL_EOL); 1773 sysctl_createv(clog, 0, NULL, NULL, 1774 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1775 CTLTYPE_INT, "do_loopback_cksum", 1776 SYSCTL_DESCR("Perform IP checksum on loopback"), 1777 NULL, 0, &ip_do_loopback_cksum, 0, 1778 CTL_NET, PF_INET, IPPROTO_IP, 1779 IPCTL_LOOPBACKCKSUM, CTL_EOL); 1780 sysctl_createv(clog, 0, NULL, NULL, 1781 CTLFLAG_PERMANENT, 1782 CTLTYPE_STRUCT, "stats", 1783 SYSCTL_DESCR("IP statistics"), 1784 sysctl_net_inet_ip_stats, 0, NULL, 0, 1785 CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, 1786 CTL_EOL); 1787 #if NARP 1788 sysctl_createv(clog, 0, NULL, NULL, 1789 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1790 CTLTYPE_INT, "dad_count", 1791 SYSCTL_DESCR("Number of Duplicate Address Detection " 1792 "probes to send"), 1793 NULL, 0, &ip_dad_count, 0, 1794 CTL_NET, PF_INET, IPPROTO_IP, 1795 IPCTL_DAD_COUNT, CTL_EOL); 1796 #endif 1797 1798 /* anonportalgo RFC6056 subtree */ 1799 const struct sysctlnode *portalgo_node; 1800 sysctl_createv(clog, 0, NULL, &portalgo_node, 1801 CTLFLAG_PERMANENT, 1802 CTLTYPE_NODE, "anonportalgo", 1803 SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"), 1804 NULL, 0, NULL, 0, 1805 CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL); 1806 sysctl_createv(clog, 0, &portalgo_node, NULL, 1807 CTLFLAG_PERMANENT, 1808 CTLTYPE_STRING, "available", 1809 SYSCTL_DESCR("available algorithms"), 1810 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1811 CTL_CREATE, CTL_EOL); 1812 sysctl_createv(clog, 0, &portalgo_node, NULL, 1813 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1814 CTLTYPE_STRING, "selected", 1815 SYSCTL_DESCR("selected algorithm"), 1816 sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN, 1817 CTL_CREATE, CTL_EOL); 1818 sysctl_createv(clog, 0, &portalgo_node, NULL, 1819 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1820 CTLTYPE_STRUCT, "reserve", 1821 SYSCTL_DESCR("bitmap of reserved ports"), 1822 sysctl_portalgo_reserve4, 0, NULL, 0, 1823 CTL_CREATE, CTL_EOL); 1824 } 1825 1826 void 1827 ip_statinc(u_int stat) 1828 { 1829 1830 KASSERT(stat < IP_NSTATS); 1831 IP_STATINC(stat); 1832 } 1833
Indexes created Sat Sep 20 22:09:52 GMT 2025