1 /* $NetBSD: ip_input.c,v 1.407 2026/05/29 02:52:06 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 1.407 2026/05/29 02:52:06 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 return; 727 } 728 729 /* 730 * If ip_dst matched any of my address on !IFF_UP interface, 731 * and there's no IFF_UP interface that matches ip_dst, 732 * send icmp unreach. Forwarding it will result in in-kernel 733 * forwarding loop till TTL goes to 0. 734 */ 735 if (downmatch) { 736 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 737 IP_STATINC(IP_STAT_CANTFORWARD); 738 return; 739 } 740 #ifdef IPSEC 741 /* Check the security policy (SP) for the packet */ 742 if (ipsec_used) { 743 if (ipsec_ip_input_checkpolicy(m, true) != 0) { 744 IP_STATINC(IP_STAT_IPSECDROP_IN); 745 goto out; 746 } 747 } 748 #endif 749 ip_forward(m, srcrt, ifp); 750 return; 751 752 ours: 753 /* 754 * If offset or IP_MF are set, must reassemble. 755 */ 756 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 757 /* 758 * Pass to IP reassembly mechanism. 759 */ 760 if (ip_reass_packet(&m) != 0) { 761 /* Failed; invalid fragment(s) or packet. */ 762 goto out; 763 } 764 if (m == NULL) { 765 /* More fragments should come; silently return. */ 766 goto out; 767 } 768 /* 769 * Reassembly is done, we have the final packet. 770 * Update cached data in local variable(s). 771 */ 772 ip = mtod(m, struct ip *); 773 hlen = ip->ip_hl << 2; 774 } 775 776 M_VERIFY_PACKET(m); 777 778 #ifdef IPSEC 779 /* 780 * Enforce IPsec policy checking if we are seeing last header. 781 * Note that we do not visit this with protocols with PCB layer 782 * code - like UDP/TCP/raw IP. 783 */ 784 if (ipsec_used && 785 (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { 786 if (ipsec_ip_input_checkpolicy(m, false) != 0) { 787 IP_STATINC(IP_STAT_IPSECDROP_IN); 788 goto out; 789 } 790 } 791 #endif 792 793 /* 794 * Switch out to protocol's input routine. 795 */ 796 #if IFA_STATS 797 if (ia) { 798 struct in_ifaddr *_ia; 799 /* 800 * Keep a reference from ip_match_our_address with psref 801 * is expensive, so explore ia here again. 802 */ 803 s = pserialize_read_enter(); 804 _ia = in_get_ia(ip->ip_dst); 805 _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 806 pserialize_read_exit(s); 807 } 808 #endif 809 IP_STATINC(IP_STAT_DELIVERED); 810 811 const int off = hlen, nh = ip->ip_p; 812 813 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 814 return; 815 816 out: 817 m_freem(m); 818 } 819 820 /* 821 * IP timer processing. 822 */ 823 void 824 ip_slowtimo(void) 825 { 826 827 SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); 828 829 ip_reass_slowtimo(); 830 831 SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 832 } 833 834 /* 835 * IP drain processing. 836 */ 837 void 838 ip_drain(void) 839 { 840 841 KERNEL_LOCK(1, NULL); 842 ip_reass_drain(); 843 KERNEL_UNLOCK_ONE(NULL); 844 } 845 846 /* 847 * ip_dooptions: perform option processing on a datagram, possibly discarding 848 * it if bad options are encountered, or forwarding it if source-routed. 849 * 850 * => Returns true if packet has been forwarded/freed. 851 * => Returns false if the packet should be processed further. 852 */ 853 static bool 854 ip_dooptions(struct mbuf *m) 855 { 856 struct ip *ip = mtod(m, struct ip *); 857 u_char *cp, *cp0; 858 struct ip_timestamp *ipt; 859 struct in_ifaddr *ia; 860 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 861 int srr_present, rr_present, ts_present; 862 struct in_addr dst; 863 n_time ntime; 864 struct ifaddr *ifa = NULL; 865 int s; 866 867 srr_present = 0; 868 rr_present = 0; 869 ts_present = 0; 870 871 dst = ip->ip_dst; 872 cp = (u_char *)(ip + 1); 873 cnt = (ip->ip_hl << 2) - sizeof(struct ip); 874 for (; cnt > 0; cnt -= optlen, cp += optlen) { 875 opt = cp[IPOPT_OPTVAL]; 876 if (opt == IPOPT_EOL) 877 break; 878 if (opt == IPOPT_NOP) 879 optlen = 1; 880 else { 881 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 882 code = &cp[IPOPT_OLEN] - (u_char *)ip; 883 goto bad; 884 } 885 optlen = cp[IPOPT_OLEN]; 886 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 887 code = &cp[IPOPT_OLEN] - (u_char *)ip; 888 goto bad; 889 } 890 } 891 switch (opt) { 892 893 default: 894 break; 895 896 /* 897 * Source routing with record. 898 * Find interface with current destination address. 899 * If none on this machine then drop if strictly routed, 900 * or do nothing if loosely routed. 901 * Record interface address and bring up next address 902 * component. If strictly routed make sure next 903 * address is on directly accessible net. 904 */ 905 case IPOPT_LSRR: 906 case IPOPT_SSRR: { 907 struct sockaddr_in ipaddr = { 908 .sin_len = sizeof(ipaddr), 909 .sin_family = AF_INET, 910 }; 911 912 if (ip_allowsrcrt == 0) { 913 type = ICMP_UNREACH; 914 code = ICMP_UNREACH_NET_PROHIB; 915 goto bad; 916 } 917 if (srr_present++) { 918 code = &cp[IPOPT_OPTVAL] - (u_char *)ip; 919 goto bad; 920 } 921 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 922 code = &cp[IPOPT_OLEN] - (u_char *)ip; 923 goto bad; 924 } 925 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 926 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 927 goto bad; 928 } 929 ipaddr.sin_addr = ip->ip_dst; 930 931 s = pserialize_read_enter(); 932 ifa = ifa_ifwithaddr(sintosa(&ipaddr)); 933 if (ifa == NULL) { 934 pserialize_read_exit(s); 935 if (opt == IPOPT_SSRR) { 936 type = ICMP_UNREACH; 937 code = ICMP_UNREACH_SRCFAIL; 938 goto bad; 939 } 940 /* 941 * Loose routing, and not at next destination 942 * yet; nothing to do except forward. 943 */ 944 break; 945 } 946 pserialize_read_exit(s); 947 948 off--; /* 0 origin */ 949 if ((off + sizeof(struct in_addr)) > optlen) { 950 /* 951 * End of source route. Should be for us. 952 */ 953 save_rte(m, cp, ip->ip_src); 954 break; 955 } 956 /* 957 * locate outgoing interface 958 */ 959 memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), 960 sizeof(ipaddr.sin_addr)); 961 int error = -1; 962 if (opt == IPOPT_SSRR) { 963 s = pserialize_read_enter(); 964 ifa = ifa_ifwithladdr(sintosa(&ipaddr)); 965 if (ifa != NULL) { 966 ia = ifatoia(ifa); 967 memcpy(cp + off, &ia->ia_addr.sin_addr, 968 sizeof(struct in_addr)); 969 error = 0; 970 } 971 pserialize_read_exit(s); 972 } else { 973 struct in_addr addr; 974 error = ip_rtaddr(ipaddr.sin_addr, &addr); 975 if (error == 0) 976 memcpy(cp + off, &addr, sizeof(addr)); 977 } 978 if (error != 0) { 979 type = ICMP_UNREACH; 980 code = ICMP_UNREACH_SRCFAIL; 981 goto bad; 982 } 983 ip->ip_dst = ipaddr.sin_addr; 984 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 985 /* 986 * Let ip_intr's mcast routing check handle mcast pkts 987 */ 988 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 989 break; 990 } 991 992 case IPOPT_RR: { 993 struct sockaddr_in ipaddr = { 994 .sin_len = sizeof(ipaddr), 995 .sin_family = AF_INET, 996 }; 997 998 if (rr_present++) { 999 code = &cp[IPOPT_OPTVAL] - (u_char *)ip; 1000 goto bad; 1001 } 1002 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1003 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1004 goto bad; 1005 } 1006 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1007 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1008 goto bad; 1009 } 1010 /* 1011 * If no space remains, ignore. 1012 */ 1013 off--; /* 0 origin */ 1014 if ((off + sizeof(struct in_addr)) > optlen) 1015 break; 1016 memcpy((void *)&ipaddr.sin_addr, (void *)&ip->ip_dst, 1017 sizeof(ipaddr.sin_addr)); 1018 /* 1019 * locate outgoing interface; if we're the destination, 1020 * use the incoming interface (should be same). 1021 */ 1022 s = pserialize_read_enter(); 1023 ifa = ifa_ifwithaddr(sintosa(&ipaddr)); 1024 if (ifa != NULL) { 1025 ia = ifatoia(ifa); 1026 memcpy(cp + off, &ia->ia_addr.sin_addr, 1027 sizeof(struct in_addr)); 1028 pserialize_read_exit(s); 1029 } else { 1030 struct in_addr addr; 1031 int error; 1032 pserialize_read_exit(s); 1033 1034 error = ip_rtaddr(ipaddr.sin_addr, &addr); 1035 if (error != 0) { 1036 type = ICMP_UNREACH; 1037 code = ICMP_UNREACH_HOST; 1038 goto bad; 1039 } 1040 memcpy(cp + off, &addr, sizeof(addr)); 1041 } 1042 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1043 break; 1044 } 1045 1046 case IPOPT_TS: 1047 code = cp - (u_char *)ip; 1048 ipt = (struct ip_timestamp *)cp; 1049 if (ts_present++) { 1050 code = &cp[IPOPT_OPTVAL] - (u_char *)ip; 1051 goto bad; 1052 } 1053 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1054 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1055 goto bad; 1056 } 1057 if (ipt->ipt_ptr < 5) { 1058 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1059 goto bad; 1060 } 1061 if (ipt->ipt_ptr > ipt->ipt_len - sizeof(int32_t)) { 1062 if (++ipt->ipt_oflw == 0) { 1063 code = (u_char *)&ipt->ipt_ptr - 1064 (u_char *)ip; 1065 goto bad; 1066 } 1067 break; 1068 } 1069 cp0 = (cp + ipt->ipt_ptr - 1); 1070 switch (ipt->ipt_flg) { 1071 1072 case IPOPT_TS_TSONLY: 1073 break; 1074 1075 case IPOPT_TS_TSANDADDR: { 1076 struct ifnet *rcvif; 1077 int _s, _ss; 1078 struct sockaddr_in ipaddr = { 1079 .sin_len = sizeof(ipaddr), 1080 .sin_family = AF_INET, 1081 }; 1082 1083 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1084 sizeof(struct in_addr) > ipt->ipt_len) { 1085 code = (u_char *)&ipt->ipt_ptr - 1086 (u_char *)ip; 1087 goto bad; 1088 } 1089 ipaddr.sin_addr = dst; 1090 _ss = pserialize_read_enter(); 1091 rcvif = m_get_rcvif(m, &_s); 1092 if (__predict_true(rcvif != NULL)) { 1093 ifa = ifaof_ifpforaddr(sintosa(&ipaddr), 1094 rcvif); 1095 } 1096 m_put_rcvif(rcvif, &_s); 1097 if (ifa == NULL) { 1098 pserialize_read_exit(_ss); 1099 break; 1100 } 1101 ia = ifatoia(ifa); 1102 memcpy(cp0, &ia->ia_addr.sin_addr, 1103 sizeof(struct in_addr)); 1104 pserialize_read_exit(_ss); 1105 ipt->ipt_ptr += sizeof(struct in_addr); 1106 break; 1107 } 1108 1109 case IPOPT_TS_PRESPEC: { 1110 struct sockaddr_in ipaddr = { 1111 .sin_len = sizeof(ipaddr), 1112 .sin_family = AF_INET, 1113 }; 1114 1115 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1116 sizeof(struct in_addr) > ipt->ipt_len) { 1117 code = (u_char *)&ipt->ipt_ptr - 1118 (u_char *)ip; 1119 goto bad; 1120 } 1121 memcpy(&ipaddr.sin_addr, cp0, 1122 sizeof(struct in_addr)); 1123 s = pserialize_read_enter(); 1124 ifa = ifa_ifwithaddr(sintosa(&ipaddr)); 1125 if (ifa == NULL) { 1126 pserialize_read_exit(s); 1127 continue; 1128 } 1129 pserialize_read_exit(s); 1130 ipt->ipt_ptr += sizeof(struct in_addr); 1131 break; 1132 } 1133 1134 default: 1135 /* XXX can't take &ipt->ipt_flg */ 1136 code = (u_char *)&ipt->ipt_ptr - 1137 (u_char *)ip + 1; 1138 goto bad; 1139 } 1140 ntime = iptime(); 1141 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1142 memmove((char *)cp + ipt->ipt_ptr - 1, cp0, 1143 sizeof(n_time)); 1144 ipt->ipt_ptr += sizeof(n_time); 1145 } 1146 } 1147 if (forward) { 1148 struct ifnet *rcvif; 1149 struct psref _psref; 1150 1151 if (ip_forwsrcrt == 0) { 1152 type = ICMP_UNREACH; 1153 code = ICMP_UNREACH_SRCFAIL; 1154 goto bad; 1155 } 1156 1157 rcvif = m_get_rcvif_psref(m, &_psref); 1158 if (__predict_false(rcvif == NULL)) { 1159 type = ICMP_UNREACH; 1160 code = ICMP_UNREACH_HOST; 1161 goto bad; 1162 } 1163 ip_forward(m, 1, rcvif); 1164 m_put_rcvif_psref(rcvif, &_psref); 1165 return true; 1166 } 1167 return false; 1168 bad: 1169 icmp_error(m, type, code, 0, 0); 1170 IP_STATINC(IP_STAT_BADOPTIONS); 1171 return true; 1172 } 1173 1174 /* 1175 * ip_rtaddr: given address of next destination (final or next hop), 1176 * return internet address of interface to be used to get there. 1177 */ 1178 static int 1179 ip_rtaddr(struct in_addr dst, struct in_addr *ret) 1180 { 1181 struct rtentry *rt; 1182 union { 1183 struct sockaddr dst; 1184 struct sockaddr_in dst4; 1185 } u; 1186 struct route *ro; 1187 struct in_ifaddr *ia; 1188 1189 sockaddr_in_init(&u.dst4, &dst, 0); 1190 1191 ro = rtcache_percpu_getref(ipforward_rt_percpu); 1192 rt = rtcache_lookup(ro, &u.dst); 1193 if (rt == NULL) { 1194 rtcache_percpu_putref(ipforward_rt_percpu); 1195 return -1; 1196 } 1197 1198 ia = ifatoia(rt->rt_ifa); 1199 *ret = ia->ia_addr.sin_addr; 1200 rtcache_unref(rt, ro); 1201 rtcache_percpu_putref(ipforward_rt_percpu); 1202 1203 return 0; 1204 } 1205 1206 /* 1207 * save_rte: save incoming source route for use in replies, to be picked 1208 * up later by ip_srcroute if the receiver is interested. 1209 */ 1210 static void 1211 save_rte(struct mbuf *m, u_char *option, struct in_addr dst) 1212 { 1213 struct ip_srcrt *isr; 1214 struct m_tag *mtag; 1215 unsigned olen; 1216 1217 olen = option[IPOPT_OLEN]; 1218 if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes)) 1219 return; 1220 1221 mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT); 1222 if (mtag == NULL) 1223 return; 1224 isr = (struct ip_srcrt *)(mtag + 1); 1225 1226 memcpy(isr->isr_hdr, option, olen); 1227 isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1228 isr->isr_dst = dst; 1229 m_tag_prepend(m, mtag); 1230 } 1231 1232 /* 1233 * Retrieve incoming source route for use in replies, 1234 * in the same form used by setsockopt. 1235 * The first hop is placed before the options, will be removed later. 1236 */ 1237 struct mbuf * 1238 ip_srcroute(struct mbuf *m0) 1239 { 1240 struct in_addr *p, *q; 1241 struct mbuf *m; 1242 struct ip_srcrt *isr; 1243 struct m_tag *mtag; 1244 1245 mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE); 1246 if (mtag == NULL) 1247 return NULL; 1248 isr = (struct ip_srcrt *)(mtag + 1); 1249 1250 if (isr->isr_nhops == 0) 1251 return NULL; 1252 1253 m = m_get(M_DONTWAIT, MT_SOOPTS); 1254 if (m == NULL) 1255 return NULL; 1256 1257 MCLAIM(m, &inetdomain.dom_mowner); 1258 #define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr)) 1259 1260 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */ 1261 m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ; 1262 1263 /* 1264 * First save first hop for return route 1265 */ 1266 p = &(isr->isr_routes[isr->isr_nhops - 1]); 1267 *(mtod(m, struct in_addr *)) = *p--; 1268 1269 /* 1270 * Copy option fields and padding (nop) to mbuf. 1271 */ 1272 isr->isr_nop = IPOPT_NOP; 1273 isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF; 1274 memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop, 1275 OPTSIZ); 1276 q = (struct in_addr *)(mtod(m, char *) + 1277 sizeof(struct in_addr) + OPTSIZ); 1278 #undef OPTSIZ 1279 /* 1280 * Record return path as an IP source route, 1281 * reversing the path (pointers are now aligned). 1282 */ 1283 while (p >= isr->isr_routes) { 1284 *q++ = *p--; 1285 } 1286 /* 1287 * Last hop goes to final destination. 1288 */ 1289 *q = isr->isr_dst; 1290 m_tag_delete(m0, mtag); 1291 return m; 1292 } 1293 1294 const int inetctlerrmap[PRC_NCMDS] = { 1295 [PRC_MSGSIZE] = EMSGSIZE, 1296 [PRC_HOSTDEAD] = EHOSTDOWN, 1297 [PRC_HOSTUNREACH] = EHOSTUNREACH, 1298 [PRC_UNREACH_NET] = EHOSTUNREACH, 1299 [PRC_UNREACH_HOST] = EHOSTUNREACH, 1300 [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, 1301 [PRC_UNREACH_PORT] = ECONNREFUSED, 1302 [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, 1303 [PRC_PARAMPROB] = ENOPROTOOPT, 1304 }; 1305 1306 void 1307 ip_fasttimo(void) 1308 { 1309 if (ip_drainwanted) { 1310 ip_drain(); 1311 ip_drainwanted = 0; 1312 } 1313 } 1314 1315 void 1316 ip_drainstub(void) 1317 { 1318 ip_drainwanted = 1; 1319 } 1320 1321 /* 1322 * Forward a packet. If some error occurs return the sender 1323 * an icmp packet. Note we can't always generate a meaningful 1324 * icmp message because icmp doesn't have a large enough repertoire 1325 * of codes and types. 1326 * 1327 * If not forwarding, just drop the packet. This could be confusing 1328 * if ipforwarding was zero but some routing protocol was advancing 1329 * us as a gateway to somewhere. However, we must let the routing 1330 * protocol deal with that. 1331 * 1332 * The srcrt parameter indicates whether the packet is being forwarded 1333 * via a source route. 1334 */ 1335 static void 1336 ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif) 1337 { 1338 struct ip *ip = mtod(m, struct ip *); 1339 struct rtentry *rt; 1340 int error, type = 0, code = 0, destmtu = 0; 1341 struct mbuf *mcopy; 1342 n_long dest; 1343 union { 1344 struct sockaddr dst; 1345 struct sockaddr_in dst4; 1346 } u; 1347 net_stat_ref_t ips; 1348 struct route *ro; 1349 1350 KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software " 1351 "interrupt handler; synchronization assumptions violated"); 1352 1353 /* 1354 * We are now in the output path. 1355 */ 1356 MCLAIM(m, &ip_tx_mowner); 1357 1358 /* 1359 * Clear any in-bound checksum flags for this packet. 1360 */ 1361 m->m_pkthdr.csum_flags = 0; 1362 1363 dest = 0; 1364 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1365 IP_STATINC(IP_STAT_CANTFORWARD); 1366 m_freem(m); 1367 return; 1368 } 1369 1370 if (ip->ip_ttl <= IPTTLDEC) { 1371 IP_STATINC(IP_STAT_TIMXCEED); 1372 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1373 return; 1374 } 1375 1376 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1377 1378 ro = rtcache_percpu_getref(ipforward_rt_percpu); 1379 rt = rtcache_lookup(ro, &u.dst); 1380 if (rt == NULL) { 1381 rtcache_percpu_putref(ipforward_rt_percpu); 1382 IP_STATINC(IP_STAT_NOROUTE); 1383 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); 1384 return; 1385 } 1386 #ifdef NET_MPSAFE 1387 /* 1388 * XXX workaround an inconsistency issue between address and route on 1389 * address initialization to avoid packet looping. See doc/TODO.smpnet. 1390 */ 1391 if (__predict_false(rt->rt_ifp->if_type == IFT_LOOP)) { 1392 rtcache_unref(rt, ro); 1393 rtcache_percpu_putref(ipforward_rt_percpu); 1394 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 1395 IP_STATINC(IP_STAT_CANTFORWARD); 1396 return; 1397 } 1398 #endif 1399 1400 /* 1401 * Save at most 68 bytes of the packet in case 1402 * we need to generate an ICMP message to the src. 1403 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1404 */ 1405 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1406 if (mcopy) 1407 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1408 1409 ip->ip_ttl -= IPTTLDEC; 1410 1411 /* 1412 * If forwarding packet using same interface that it came in on, 1413 * perhaps should send a redirect to sender to shortcut a hop. 1414 * Only send redirect if source is sending directly to us, 1415 * and if packet was not source routed (or has any options). 1416 * Also, don't send redirect if forwarding using a default route 1417 * or a route modified by a redirect. 1418 */ 1419 if (rt->rt_ifp == rcvif && 1420 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1421 !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && 1422 ipsendredirects && !srcrt) { 1423 if ((ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1424 ifatoia(rt->rt_ifa)->ia_subnet) { 1425 if (rt->rt_flags & RTF_GATEWAY) 1426 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1427 else 1428 dest = ip->ip_dst.s_addr; 1429 /* 1430 * Router requirements says to only send host 1431 * redirects. 1432 */ 1433 type = ICMP_REDIRECT; 1434 code = ICMP_REDIRECT_HOST; 1435 } 1436 } 1437 rtcache_unref(rt, ro); 1438 1439 error = ip_output(m, NULL, ro, 1440 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 1441 NULL, NULL); 1442 1443 if (error) { 1444 IP_STATINC(IP_STAT_CANTFORWARD); 1445 goto error; 1446 } 1447 1448 ips = IP_STAT_GETREF(); 1449 _NET_STATINC_REF(ips, IP_STAT_FORWARD); 1450 1451 if (type) { 1452 _NET_STATINC_REF(ips, IP_STAT_REDIRECTSENT); 1453 IP_STAT_PUTREF(); 1454 goto redirect; 1455 } 1456 1457 IP_STAT_PUTREF(); 1458 if (mcopy) { 1459 #ifdef GATEWAY 1460 if (mcopy->m_flags & M_CANFASTFWD) 1461 ipflow_create(ro, mcopy); 1462 #endif 1463 m_freem(mcopy); 1464 } 1465 1466 rtcache_percpu_putref(ipforward_rt_percpu); 1467 return; 1468 1469 redirect: 1470 error: 1471 if (mcopy == NULL) { 1472 rtcache_percpu_putref(ipforward_rt_percpu); 1473 return; 1474 } 1475 1476 switch (error) { 1477 1478 case 0: /* forwarded, but need redirect */ 1479 /* type, code set above */ 1480 break; 1481 1482 case ENETUNREACH: /* shouldn't happen, checked above */ 1483 case EHOSTUNREACH: 1484 case ENETDOWN: 1485 case EHOSTDOWN: 1486 default: 1487 type = ICMP_UNREACH; 1488 code = ICMP_UNREACH_HOST; 1489 break; 1490 1491 case EMSGSIZE: 1492 type = ICMP_UNREACH; 1493 code = ICMP_UNREACH_NEEDFRAG; 1494 1495 if ((rt = rtcache_validate(ro)) != NULL) { 1496 destmtu = rt->rt_ifp->if_mtu; 1497 rtcache_unref(rt, ro); 1498 } 1499 #ifdef IPSEC 1500 if (ipsec_used) 1501 ipsec_mtu(mcopy, &destmtu); 1502 #endif 1503 IP_STATINC(IP_STAT_CANTFRAG); 1504 break; 1505 1506 case ENOBUFS: 1507 /* 1508 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812, 1509 * Requirements for IP Version 4 Routers. Source quench can 1510 * be a big problem under DoS attacks or if the underlying 1511 * interface is rate-limited. 1512 */ 1513 m_freem(mcopy); 1514 rtcache_percpu_putref(ipforward_rt_percpu); 1515 return; 1516 } 1517 icmp_error(mcopy, type, code, dest, destmtu); 1518 rtcache_percpu_putref(ipforward_rt_percpu); 1519 } 1520 1521 void 1522 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1523 struct mbuf *m) 1524 { 1525 struct socket *so = inp->inp_socket; 1526 int inpflags = inp->inp_flags; 1527 1528 if (SOOPT_TIMESTAMP(so->so_options)) 1529 mp = sbsavetimestamp(so->so_options, mp); 1530 1531 if (inpflags & INP_RECVDSTADDR) { 1532 *mp = sbcreatecontrol(&ip->ip_dst, 1533 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1534 if (*mp) 1535 mp = &(*mp)->m_next; 1536 } 1537 1538 if (inpflags & INP_RECVTTL) { 1539 *mp = sbcreatecontrol(&ip->ip_ttl, 1540 sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); 1541 if (*mp) 1542 mp = &(*mp)->m_next; 1543 } 1544 1545 struct psref psref; 1546 ifnet_t *ifp = m_get_rcvif_psref(m, &psref); 1547 if (__predict_false(ifp == NULL)) { 1548 #ifdef DIAGNOSTIC 1549 printf("%s: missing receive interface\n", __func__); 1550 #endif 1551 return; /* XXX should report error? */ 1552 } 1553 1554 if (inpflags & INP_RECVPKTINFO) { 1555 struct in_pktinfo ipi; 1556 ipi.ipi_addr = ip->ip_dst; 1557 ipi.ipi_ifindex = ifp->if_index; 1558 *mp = sbcreatecontrol(&ipi, 1559 sizeof(ipi), IP_PKTINFO, IPPROTO_IP); 1560 if (*mp) 1561 mp = &(*mp)->m_next; 1562 } 1563 if (inpflags & INP_RECVIF) { 1564 struct sockaddr_dl sdl; 1565 1566 sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0, 1567 NULL, 0); 1568 *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); 1569 if (*mp) 1570 mp = &(*mp)->m_next; 1571 } 1572 m_put_rcvif_psref(ifp, &psref); 1573 } 1574 1575 /* 1576 * sysctl helper routine for net.inet.ip.forwsrcrt. 1577 */ 1578 static int 1579 sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) 1580 { 1581 int error, tmp; 1582 struct sysctlnode node; 1583 1584 node = *rnode; 1585 tmp = ip_forwsrcrt; 1586 node.sysctl_data = &tmp; 1587 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1588 if (error || newp == NULL) 1589 return (error); 1590 1591 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, 1592 0, NULL, NULL, NULL); 1593 if (error) 1594 return (error); 1595 1596 ip_forwsrcrt = tmp; 1597 1598 return (0); 1599 } 1600 1601 /* 1602 * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the 1603 * range of the new value and tweaks timers if it changes. 1604 */ 1605 static int 1606 sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) 1607 { 1608 int error, tmp; 1609 struct sysctlnode node; 1610 1611 icmp_mtudisc_lock(); 1612 1613 node = *rnode; 1614 tmp = ip_mtudisc_timeout; 1615 node.sysctl_data = &tmp; 1616 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1617 if (error || newp == NULL) 1618 goto out; 1619 if (tmp < 0) { 1620 error = EINVAL; 1621 goto out; 1622 } 1623 1624 ip_mtudisc_timeout = tmp; 1625 rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); 1626 error = 0; 1627 out: 1628 icmp_mtudisc_unlock(); 1629 return error; 1630 } 1631 1632 static int 1633 sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) 1634 { 1635 1636 return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); 1637 } 1638 1639 static void 1640 sysctl_net_inet_ip_setup(struct sysctllog **clog) 1641 { 1642 const struct sysctlnode *ip_node; 1643 1644 sysctl_createv(clog, 0, NULL, NULL, 1645 CTLFLAG_PERMANENT, 1646 CTLTYPE_NODE, "inet", 1647 SYSCTL_DESCR("PF_INET related settings"), 1648 NULL, 0, NULL, 0, 1649 CTL_NET, PF_INET, CTL_EOL); 1650 sysctl_createv(clog, 0, NULL, &ip_node, 1651 CTLFLAG_PERMANENT, 1652 CTLTYPE_NODE, "ip", 1653 SYSCTL_DESCR("IPv4 related settings"), 1654 NULL, 0, NULL, 0, 1655 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 1656 1657 sysctl_createv(clog, 0, NULL, NULL, 1658 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1659 CTLTYPE_INT, "forwarding", 1660 SYSCTL_DESCR("Enable forwarding of INET datagrams"), 1661 NULL, 0, &ipforwarding, 0, 1662 CTL_NET, PF_INET, IPPROTO_IP, 1663 IPCTL_FORWARDING, CTL_EOL); 1664 sysctl_createv(clog, 0, NULL, NULL, 1665 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1666 CTLTYPE_INT, "redirect", 1667 SYSCTL_DESCR("Enable sending of ICMP redirect messages"), 1668 NULL, 0, &ipsendredirects, 0, 1669 CTL_NET, PF_INET, IPPROTO_IP, 1670 IPCTL_SENDREDIRECTS, CTL_EOL); 1671 sysctl_createv(clog, 0, NULL, NULL, 1672 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1673 CTLTYPE_INT, "ttl", 1674 SYSCTL_DESCR("Default TTL for an INET datagram"), 1675 NULL, 0, &ip_defttl, 0, 1676 CTL_NET, PF_INET, IPPROTO_IP, 1677 IPCTL_DEFTTL, CTL_EOL); 1678 sysctl_createv(clog, 0, NULL, NULL, 1679 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1680 CTLTYPE_INT, "forwsrcrt", 1681 SYSCTL_DESCR("Enable forwarding of source-routed " 1682 "datagrams"), 1683 sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, 1684 CTL_NET, PF_INET, IPPROTO_IP, 1685 IPCTL_FORWSRCRT, CTL_EOL); 1686 sysctl_createv(clog, 0, NULL, NULL, 1687 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1688 CTLTYPE_INT, "directed-broadcast", 1689 SYSCTL_DESCR("Enable forwarding of broadcast datagrams"), 1690 NULL, 0, &ip_directedbcast, 0, 1691 CTL_NET, PF_INET, IPPROTO_IP, 1692 IPCTL_DIRECTEDBCAST, CTL_EOL); 1693 sysctl_createv(clog, 0, NULL, NULL, 1694 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1695 CTLTYPE_INT, "allowsrcrt", 1696 SYSCTL_DESCR("Accept source-routed datagrams"), 1697 NULL, 0, &ip_allowsrcrt, 0, 1698 CTL_NET, PF_INET, IPPROTO_IP, 1699 IPCTL_ALLOWSRCRT, CTL_EOL); 1700 1701 sysctl_createv(clog, 0, NULL, NULL, 1702 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1703 CTLTYPE_INT, "mtudisc", 1704 SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"), 1705 NULL, 0, &ip_mtudisc, 0, 1706 CTL_NET, PF_INET, IPPROTO_IP, 1707 IPCTL_MTUDISC, CTL_EOL); 1708 sysctl_createv(clog, 0, NULL, NULL, 1709 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1710 CTLTYPE_INT, "anonportmin", 1711 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1712 sysctl_net_inet_ip_ports, 0, &anonportmin, 0, 1713 CTL_NET, PF_INET, IPPROTO_IP, 1714 IPCTL_ANONPORTMIN, CTL_EOL); 1715 sysctl_createv(clog, 0, NULL, NULL, 1716 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1717 CTLTYPE_INT, "anonportmax", 1718 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1719 sysctl_net_inet_ip_ports, 0, &anonportmax, 0, 1720 CTL_NET, PF_INET, IPPROTO_IP, 1721 IPCTL_ANONPORTMAX, CTL_EOL); 1722 sysctl_createv(clog, 0, NULL, NULL, 1723 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1724 CTLTYPE_INT, "mtudisctimeout", 1725 SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"), 1726 sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0, 1727 CTL_NET, PF_INET, IPPROTO_IP, 1728 IPCTL_MTUDISCTIMEOUT, CTL_EOL); 1729 #ifndef IPNOPRIVPORTS 1730 sysctl_createv(clog, 0, NULL, NULL, 1731 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1732 CTLTYPE_INT, "lowportmin", 1733 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1734 "to assign"), 1735 sysctl_net_inet_ip_ports, 0, &lowportmin, 0, 1736 CTL_NET, PF_INET, IPPROTO_IP, 1737 IPCTL_LOWPORTMIN, CTL_EOL); 1738 sysctl_createv(clog, 0, NULL, NULL, 1739 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1740 CTLTYPE_INT, "lowportmax", 1741 SYSCTL_DESCR("Highest privileged ephemeral port number " 1742 "to assign"), 1743 sysctl_net_inet_ip_ports, 0, &lowportmax, 0, 1744 CTL_NET, PF_INET, IPPROTO_IP, 1745 IPCTL_LOWPORTMAX, CTL_EOL); 1746 #endif /* IPNOPRIVPORTS */ 1747 #if NGRE > 0 1748 sysctl_createv(clog, 0, NULL, NULL, 1749 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1750 CTLTYPE_INT, "grettl", 1751 SYSCTL_DESCR("Default TTL for a gre tunnel datagram"), 1752 NULL, 0, &ip_gre_ttl, 0, 1753 CTL_NET, PF_INET, IPPROTO_IP, 1754 IPCTL_GRE_TTL, CTL_EOL); 1755 #endif /* NGRE */ 1756 sysctl_createv(clog, 0, NULL, NULL, 1757 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1758 CTLTYPE_INT, "checkinterface", 1759 SYSCTL_DESCR("Enable receive side of Strong ES model " 1760 "from RFC1122"), 1761 NULL, 0, &ip_checkinterface, 0, 1762 CTL_NET, PF_INET, IPPROTO_IP, 1763 IPCTL_CHECKINTERFACE, CTL_EOL); 1764 1765 pktq_sysctl_setup(ip_pktq, clog, ip_node, IPCTL_IFQ); 1766 1767 sysctl_createv(clog, 0, NULL, NULL, 1768 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1769 CTLTYPE_INT, "random_id", 1770 SYSCTL_DESCR("Assign random ip_id values"), 1771 NULL, 0, &ip_do_randomid, 0, 1772 CTL_NET, PF_INET, IPPROTO_IP, 1773 IPCTL_RANDOMID, CTL_EOL); 1774 sysctl_createv(clog, 0, NULL, NULL, 1775 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1776 CTLTYPE_INT, "do_loopback_cksum", 1777 SYSCTL_DESCR("Perform IP checksum on loopback"), 1778 NULL, 0, &ip_do_loopback_cksum, 0, 1779 CTL_NET, PF_INET, IPPROTO_IP, 1780 IPCTL_LOOPBACKCKSUM, CTL_EOL); 1781 sysctl_createv(clog, 0, NULL, NULL, 1782 CTLFLAG_PERMANENT, 1783 CTLTYPE_STRUCT, "stats", 1784 SYSCTL_DESCR("IP statistics"), 1785 sysctl_net_inet_ip_stats, 0, NULL, 0, 1786 CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, 1787 CTL_EOL); 1788 #if NARP 1789 sysctl_createv(clog, 0, NULL, NULL, 1790 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1791 CTLTYPE_INT, "dad_count", 1792 SYSCTL_DESCR("Number of Duplicate Address Detection " 1793 "probes to send"), 1794 NULL, 0, &ip_dad_count, 0, 1795 CTL_NET, PF_INET, IPPROTO_IP, 1796 IPCTL_DAD_COUNT, CTL_EOL); 1797 #endif 1798 1799 /* anonportalgo RFC6056 subtree */ 1800 const struct sysctlnode *portalgo_node; 1801 sysctl_createv(clog, 0, NULL, &portalgo_node, 1802 CTLFLAG_PERMANENT, 1803 CTLTYPE_NODE, "anonportalgo", 1804 SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"), 1805 NULL, 0, NULL, 0, 1806 CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL); 1807 sysctl_createv(clog, 0, &portalgo_node, NULL, 1808 CTLFLAG_PERMANENT, 1809 CTLTYPE_STRING, "available", 1810 SYSCTL_DESCR("available algorithms"), 1811 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1812 CTL_CREATE, CTL_EOL); 1813 sysctl_createv(clog, 0, &portalgo_node, NULL, 1814 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1815 CTLTYPE_STRING, "selected", 1816 SYSCTL_DESCR("selected algorithm"), 1817 sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN, 1818 CTL_CREATE, CTL_EOL); 1819 sysctl_createv(clog, 0, &portalgo_node, NULL, 1820 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1821 CTLTYPE_STRUCT, "reserve", 1822 SYSCTL_DESCR("bitmap of reserved ports"), 1823 sysctl_portalgo_reserve4, 0, NULL, 0, 1824 CTL_CREATE, CTL_EOL); 1825 } 1826 1827 void 1828 ip_statinc(u_int stat) 1829 { 1830 1831 KASSERT(stat < IP_NSTATS); 1832 IP_STATINC(stat); 1833 } 1834
Indexes created Thu Jun 11 00:25:07 UTC 2026