ip_input.c revision 1.353
1 /* $NetBSD: ip_input.c,v 1.353 2017/03/31 06:42:19 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 1.353 2017/03/31 06:42:19 ozaki-r Exp $"); 95 96 #ifdef _KERNEL_OPT 97 #include "opt_inet.h" 98 #include "opt_compat_netbsd.h" 99 #include "opt_gateway.h" 100 #include "opt_ipsec.h" 101 #include "opt_mrouting.h" 102 #include "opt_mbuftrace.h" 103 #include "opt_inet_csum.h" 104 #include "opt_net_mpsafe.h" 105 #endif 106 107 #include "arp.h" 108 109 #include <sys/param.h> 110 #include <sys/systm.h> 111 #include <sys/cpu.h> 112 #include <sys/mbuf.h> 113 #include <sys/domain.h> 114 #include <sys/protosw.h> 115 #include <sys/socket.h> 116 #include <sys/socketvar.h> 117 #include <sys/errno.h> 118 #include <sys/time.h> 119 #include <sys/kernel.h> 120 #include <sys/pool.h> 121 #include <sys/sysctl.h> 122 #include <sys/kauth.h> 123 124 #include <net/if.h> 125 #include <net/if_dl.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 /* GATEWAY */ 158 #define IPFORWARDING 0 /* don't forward IP packets not for us */ 159 #endif /* GATEWAY */ 160 #endif /* IPFORWARDING */ 161 #ifndef IPSENDREDIRECTS 162 #define IPSENDREDIRECTS 1 163 #endif 164 #ifndef IPFORWSRCRT 165 #define IPFORWSRCRT 1 /* forward source-routed packets */ 166 #endif 167 #ifndef IPALLOWSRCRT 168 #define IPALLOWSRCRT 1 /* allow source-routed packets */ 169 #endif 170 #ifndef IPMTUDISC 171 #define IPMTUDISC 1 172 #endif 173 #ifndef IPMTUDISCTIMEOUT 174 #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 175 #endif 176 177 #ifdef COMPAT_50 178 #include <compat/sys/time.h> 179 #include <compat/sys/socket.h> 180 #endif 181 182 /* 183 * Note: DIRECTED_BROADCAST is handled this way so that previous 184 * configuration using this option will Just Work. 185 */ 186 #ifndef IPDIRECTEDBCAST 187 #ifdef DIRECTED_BROADCAST 188 #define IPDIRECTEDBCAST 1 189 #else 190 #define IPDIRECTEDBCAST 0 191 #endif /* DIRECTED_BROADCAST */ 192 #endif /* IPDIRECTEDBCAST */ 193 int ipforwarding = IPFORWARDING; 194 int ipsendredirects = IPSENDREDIRECTS; 195 int ip_defttl = IPDEFTTL; 196 int ip_forwsrcrt = IPFORWSRCRT; 197 int ip_directedbcast = IPDIRECTEDBCAST; 198 int ip_allowsrcrt = IPALLOWSRCRT; 199 int ip_mtudisc = IPMTUDISC; 200 int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; 201 #ifdef DIAGNOSTIC 202 int ipprintfs = 0; 203 #endif 204 205 int ip_do_randomid = 0; 206 207 /* 208 * XXX - Setting ip_checkinterface mostly implements the receive side of 209 * the Strong ES model described in RFC 1122, but since the routing table 210 * and transmit implementation do not implement the Strong ES model, 211 * setting this to 1 results in an odd hybrid. 212 * 213 * XXX - ip_checkinterface currently must be disabled if you use ipnat 214 * to translate the destination address to another local interface. 215 * 216 * XXX - ip_checkinterface must be disabled if you add IP aliases 217 * to the loopback interface instead of the interface where the 218 * packets for those addresses are received. 219 */ 220 static int ip_checkinterface __read_mostly = 0; 221 222 struct rttimer_queue *ip_mtudisc_timeout_q = NULL; 223 224 pktqueue_t * ip_pktq __read_mostly; 225 pfil_head_t * inet_pfil_hook __read_mostly; 226 ipid_state_t * ip_ids __read_mostly; 227 percpu_t * ipstat_percpu __read_mostly; 228 229 static percpu_t *ipforward_rt_percpu __cacheline_aligned; 230 231 uint16_t ip_id; 232 233 #ifdef INET_CSUM_COUNTERS 234 #include <sys/device.h> 235 236 struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 237 NULL, "inet", "hwcsum bad"); 238 struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 239 NULL, "inet", "hwcsum ok"); 240 struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 241 NULL, "inet", "swcsum"); 242 243 #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 244 245 EVCNT_ATTACH_STATIC(ip_hwcsum_bad); 246 EVCNT_ATTACH_STATIC(ip_hwcsum_ok); 247 EVCNT_ATTACH_STATIC(ip_swcsum); 248 249 #else 250 251 #define INET_CSUM_COUNTER_INCR(ev) /* nothing */ 252 253 #endif /* INET_CSUM_COUNTERS */ 254 255 /* 256 * We need to save the IP options in case a protocol wants to respond 257 * to an incoming packet over the same route if the packet got here 258 * using IP source routing. This allows connection establishment and 259 * maintenance when the remote end is on a network that is not known 260 * to us. 261 */ 262 263 static int ip_nhops = 0; 264 265 static struct ip_srcrt { 266 struct in_addr dst; /* final destination */ 267 char nop; /* one NOP to align */ 268 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 269 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 270 } ip_srcrt; 271 272 static int ip_drainwanted; 273 274 static void save_rte(u_char *, struct in_addr); 275 276 #ifdef MBUFTRACE 277 struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx"); 278 struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx"); 279 #endif 280 281 static void ipintr(void *); 282 static void ip_input(struct mbuf *); 283 static void ip_forward(struct mbuf *, int, struct ifnet *); 284 static bool ip_dooptions(struct mbuf *); 285 static struct in_ifaddr *ip_rtaddr(struct in_addr, struct psref *); 286 static void sysctl_net_inet_ip_setup(struct sysctllog **); 287 288 static struct in_ifaddr *ip_match_our_address(struct ifnet *, struct ip *, 289 int *); 290 static struct in_ifaddr *ip_match_our_address_broadcast(struct ifnet *, 291 struct ip *); 292 293 #ifdef NET_MPSAFE 294 #define SOFTNET_LOCK() mutex_enter(softnet_lock) 295 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) 296 #else 297 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) 298 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) 299 #endif 300 301 /* 302 * IP initialization: fill in IP protocol switch table. 303 * All protocols not implemented in kernel go to raw IP protocol handler. 304 */ 305 void 306 ip_init(void) 307 { 308 const struct protosw *pr; 309 310 in_init(); 311 sysctl_net_inet_ip_setup(NULL); 312 313 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 314 KASSERT(pr != NULL); 315 316 ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL); 317 KASSERT(ip_pktq != NULL); 318 319 for (u_int i = 0; i < IPPROTO_MAX; i++) { 320 ip_protox[i] = pr - inetsw; 321 } 322 for (pr = inetdomain.dom_protosw; 323 pr < inetdomain.dom_protoswNPROTOSW; pr++) 324 if (pr->pr_domain->dom_family == PF_INET && 325 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 326 ip_protox[pr->pr_protocol] = pr - inetsw; 327 328 ip_reass_init(); 329 330 ip_ids = ip_id_init(); 331 ip_id = time_uptime & 0xfffff; 332 333 #ifdef GATEWAY 334 ipflow_init(); 335 #endif 336 337 /* Register our Packet Filter hook. */ 338 inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET); 339 KASSERT(inet_pfil_hook != NULL); 340 341 #ifdef MBUFTRACE 342 MOWNER_ATTACH(&ip_tx_mowner); 343 MOWNER_ATTACH(&ip_rx_mowner); 344 #endif /* MBUFTRACE */ 345 346 ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS); 347 348 ipforward_rt_percpu = percpu_alloc(sizeof(struct route)); 349 if (ipforward_rt_percpu == NULL) 350 panic("failed to allocate ipforward_rt_percpu"); 351 352 ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); 353 } 354 355 static struct in_ifaddr * 356 ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch) 357 { 358 struct in_ifaddr *ia = NULL; 359 int checkif; 360 361 /* 362 * Enable a consistency check between the destination address 363 * and the arrival interface for a unicast packet (the RFC 1122 364 * strong ES model) if IP forwarding is disabled and the packet 365 * is not locally generated. 366 * 367 * XXX - Checking also should be disabled if the destination 368 * address is ipnat'ed to a different interface. 369 * 370 * XXX - Checking is incompatible with IP aliases added 371 * to the loopback interface instead of the interface where 372 * the packets are received. 373 * 374 * XXX - We need to add a per ifaddr flag for this so that 375 * we get finer grain control. 376 */ 377 checkif = ip_checkinterface && (ipforwarding == 0) && 378 (ifp->if_flags & IFF_LOOPBACK) == 0; 379 380 IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) { 381 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 382 if (ia->ia4_flags & IN_IFF_NOTREADY) 383 continue; 384 if (checkif && ia->ia_ifp != ifp) 385 continue; 386 if ((ia->ia_ifp->if_flags & IFF_UP) != 0 && 387 (ia->ia4_flags & IN_IFF_DETACHED) == 0) 388 break; 389 else 390 (*downmatch)++; 391 } 392 } 393 394 return ia; 395 } 396 397 static struct in_ifaddr * 398 ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip) 399 { 400 struct in_ifaddr *ia = NULL; 401 struct ifaddr *ifa; 402 403 IFADDR_READER_FOREACH(ifa, ifp) { 404 if (ifa->ifa_addr->sa_family != AF_INET) 405 continue; 406 ia = ifatoia(ifa); 407 if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED)) 408 continue; 409 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 410 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 411 /* 412 * Look for all-0's host part (old broadcast addr), 413 * either for subnet or net. 414 */ 415 ip->ip_dst.s_addr == ia->ia_subnet || 416 ip->ip_dst.s_addr == ia->ia_net) 417 goto matched; 418 /* 419 * An interface with IP address zero accepts 420 * all packets that arrive on that interface. 421 */ 422 if (in_nullhost(ia->ia_addr.sin_addr)) 423 goto matched; 424 } 425 ia = NULL; 426 427 matched: 428 return ia; 429 } 430 431 /* 432 * IP software interrupt routine. 433 */ 434 static void 435 ipintr(void *arg __unused) 436 { 437 struct mbuf *m; 438 439 KASSERT(cpu_softintr_p()); 440 441 #ifndef NET_MPSAFE 442 mutex_enter(softnet_lock); 443 #endif 444 while ((m = pktq_dequeue(ip_pktq)) != NULL) { 445 ip_input(m); 446 } 447 #ifndef NET_MPSAFE 448 mutex_exit(softnet_lock); 449 #endif 450 } 451 452 /* 453 * IP input routine. Checksum and byte swap header. If fragmented 454 * try to reassemble. Process options. Pass to next level. 455 */ 456 static void 457 ip_input(struct mbuf *m) 458 { 459 struct ip *ip = NULL; 460 struct in_ifaddr *ia = NULL; 461 int hlen = 0, len; 462 int downmatch; 463 int srcrt = 0; 464 ifnet_t *ifp; 465 struct psref psref; 466 int s; 467 468 KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software " 469 "interrupt handler; synchronization assumptions violated"); 470 471 MCLAIM(m, &ip_rx_mowner); 472 KASSERT((m->m_flags & M_PKTHDR) != 0); 473 474 ifp = m_get_rcvif_psref(m, &psref); 475 if (__predict_false(ifp == NULL)) 476 goto out; 477 478 /* 479 * If no IP addresses have been set yet but the interfaces 480 * are receiving, can't do anything with incoming packets yet. 481 * Note: we pre-check without locks held. 482 */ 483 if (IN_ADDRLIST_READER_EMPTY()) 484 goto out; 485 IP_STATINC(IP_STAT_TOTAL); 486 487 /* 488 * If the IP header is not aligned, slurp it up into a new 489 * mbuf with space for link headers, in the event we forward 490 * it. Otherwise, if it is aligned, make sure the entire 491 * base IP header is in the first mbuf of the chain. 492 */ 493 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 494 if ((m = m_copyup(m, sizeof(struct ip), 495 (max_linkhdr + 3) & ~3)) == NULL) { 496 /* XXXJRT new stat, please */ 497 IP_STATINC(IP_STAT_TOOSMALL); 498 goto out; 499 } 500 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 501 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 502 IP_STATINC(IP_STAT_TOOSMALL); 503 goto out; 504 } 505 } 506 ip = mtod(m, struct ip *); 507 if (ip->ip_v != IPVERSION) { 508 IP_STATINC(IP_STAT_BADVERS); 509 goto out; 510 } 511 hlen = ip->ip_hl << 2; 512 if (hlen < sizeof(struct ip)) { /* minimum header length */ 513 IP_STATINC(IP_STAT_BADHLEN); 514 goto out; 515 } 516 if (hlen > m->m_len) { 517 if ((m = m_pullup(m, hlen)) == NULL) { 518 IP_STATINC(IP_STAT_BADHLEN); 519 goto out; 520 } 521 ip = mtod(m, struct ip *); 522 } 523 524 /* 525 * RFC1122: packets with a multicast source address are 526 * not allowed. 527 */ 528 if (IN_MULTICAST(ip->ip_src.s_addr)) { 529 IP_STATINC(IP_STAT_BADADDR); 530 goto out; 531 } 532 533 /* 127/8 must not appear on wire - RFC1122 */ 534 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 535 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 536 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 537 IP_STATINC(IP_STAT_BADADDR); 538 goto out; 539 } 540 } 541 542 switch (m->m_pkthdr.csum_flags & 543 ((ifp->if_csum_flags_rx & M_CSUM_IPv4) | 544 M_CSUM_IPv4_BAD)) { 545 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 546 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 547 IP_STATINC(IP_STAT_BADSUM); 548 goto out; 549 550 case M_CSUM_IPv4: 551 /* Checksum was okay. */ 552 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 553 break; 554 555 default: 556 /* 557 * Must compute it ourselves. Maybe skip checksum on 558 * loopback interfaces. 559 */ 560 if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) || 561 ip_do_loopback_cksum)) { 562 INET_CSUM_COUNTER_INCR(&ip_swcsum); 563 if (in_cksum(m, hlen) != 0) { 564 IP_STATINC(IP_STAT_BADSUM); 565 goto out; 566 } 567 } 568 break; 569 } 570 571 /* Retrieve the packet length. */ 572 len = ntohs(ip->ip_len); 573 574 /* 575 * Check for additional length bogosity 576 */ 577 if (len < hlen) { 578 IP_STATINC(IP_STAT_BADLEN); 579 goto out; 580 } 581 582 /* 583 * Check that the amount of data in the buffers 584 * is as at least much as the IP header would have us expect. 585 * Trim mbufs if longer than we expect. 586 * Drop packet if shorter than we expect. 587 */ 588 if (m->m_pkthdr.len < len) { 589 IP_STATINC(IP_STAT_TOOSHORT); 590 goto out; 591 } 592 if (m->m_pkthdr.len > len) { 593 if (m->m_len == m->m_pkthdr.len) { 594 m->m_len = len; 595 m->m_pkthdr.len = len; 596 } else 597 m_adj(m, len - m->m_pkthdr.len); 598 } 599 600 /* 601 * Assume that we can create a fast-forward IP flow entry 602 * based on this packet. 603 */ 604 m->m_flags |= M_CANFASTFWD; 605 606 /* 607 * Run through list of hooks for input packets. If there are any 608 * filters which require that additional packets in the flow are 609 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 610 * Note that filters must _never_ set this flag, as another filter 611 * in the list may have previously cleared it. 612 */ 613 #if defined(IPSEC) 614 if (!ipsec_used || !ipsec_indone(m)) 615 #else 616 if (1) 617 #endif 618 { 619 struct in_addr odst = ip->ip_dst; 620 bool freed; 621 622 freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0; 623 if (freed || m == NULL) { 624 m = NULL; 625 goto out; 626 } 627 ip = mtod(m, struct ip *); 628 hlen = ip->ip_hl << 2; 629 630 /* 631 * XXX The setting of "srcrt" here is to prevent ip_forward() 632 * from generating ICMP redirects for packets that have 633 * been redirected by a hook back out on to the same LAN that 634 * they came from and is not an indication that the packet 635 * is being inffluenced by source routing options. This 636 * allows things like 637 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" 638 * where tlp0 is both on the 1.1.1.0/24 network and is the 639 * default route for hosts on 1.1.1.0/24. Of course this 640 * also requires a "map tlp0 ..." to complete the story. 641 * One might argue whether or not this kind of network config. 642 * should be supported in this manner... 643 */ 644 srcrt = (odst.s_addr != ip->ip_dst.s_addr); 645 } 646 647 #ifdef ALTQ 648 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 649 if (altq_input) { 650 SOFTNET_LOCK(); 651 if ((*altq_input)(m, AF_INET) == 0) { 652 /* Packet dropped by traffic conditioner. */ 653 SOFTNET_UNLOCK(); 654 m = NULL; 655 goto out; 656 } 657 SOFTNET_UNLOCK(); 658 } 659 #endif 660 661 /* 662 * Process options and, if not destined for us, 663 * ship it on. ip_dooptions returns 1 when an 664 * error was detected (causing an icmp message 665 * to be sent and the original packet to be freed). 666 */ 667 ip_nhops = 0; /* for source routed packets */ 668 if (hlen > sizeof (struct ip) && ip_dooptions(m)) { 669 m = NULL; 670 goto out; 671 } 672 673 /* 674 * Check our list of addresses, to see if the packet is for us. 675 * 676 * Traditional 4.4BSD did not consult IFF_UP at all. 677 * The behavior here is to treat addresses on !IFF_UP interface 678 * or IN_IFF_NOTREADY addresses as not mine. 679 */ 680 downmatch = 0; 681 s = pserialize_read_enter(); 682 ia = ip_match_our_address(ifp, ip, &downmatch); 683 if (ia != NULL) { 684 pserialize_read_exit(s); 685 goto ours; 686 } 687 688 if (ifp->if_flags & IFF_BROADCAST) { 689 ia = ip_match_our_address_broadcast(ifp, ip); 690 if (ia != NULL) { 691 pserialize_read_exit(s); 692 goto ours; 693 } 694 } 695 pserialize_read_exit(s); 696 697 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 698 #ifdef MROUTING 699 extern struct socket *ip_mrouter; 700 701 if (ip_mrouter) { 702 /* 703 * If we are acting as a multicast router, all 704 * incoming multicast packets are passed to the 705 * kernel-level multicast forwarding function. 706 * The packet is returned (relatively) intact; if 707 * ip_mforward() returns a non-zero value, the packet 708 * must be discarded, else it may be accepted below. 709 * 710 * (The IP ident field is put in the same byte order 711 * as expected when ip_mforward() is called from 712 * ip_output().) 713 */ 714 SOFTNET_LOCK(); 715 if (ip_mforward(m, ifp) != 0) { 716 SOFTNET_UNLOCK(); 717 IP_STATINC(IP_STAT_CANTFORWARD); 718 goto out; 719 } 720 SOFTNET_UNLOCK(); 721 722 /* 723 * The process-level routing demon needs to receive 724 * all multicast IGMP packets, whether or not this 725 * host belongs to their destination groups. 726 */ 727 if (ip->ip_p == IPPROTO_IGMP) { 728 goto ours; 729 } 730 IP_STATINC(IP_STAT_CANTFORWARD); 731 } 732 #endif 733 /* 734 * See if we belong to the destination multicast group on the 735 * arrival interface. 736 */ 737 if (!in_multi_group(ip->ip_dst, ifp, 0)) { 738 IP_STATINC(IP_STAT_CANTFORWARD); 739 goto out; 740 } 741 goto ours; 742 } 743 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 744 in_nullhost(ip->ip_dst)) 745 goto ours; 746 747 /* 748 * Not for us; forward if possible and desirable. 749 */ 750 if (ipforwarding == 0) { 751 m_put_rcvif_psref(ifp, &psref); 752 IP_STATINC(IP_STAT_CANTFORWARD); 753 m_freem(m); 754 } else { 755 /* 756 * If ip_dst matched any of my address on !IFF_UP interface, 757 * and there's no IFF_UP interface that matches ip_dst, 758 * send icmp unreach. Forwarding it will result in in-kernel 759 * forwarding loop till TTL goes to 0. 760 */ 761 if (downmatch) { 762 m_put_rcvif_psref(ifp, &psref); 763 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 764 IP_STATINC(IP_STAT_CANTFORWARD); 765 return; 766 } 767 #ifdef IPSEC 768 /* Perform IPsec, if any. */ 769 if (ipsec_used) { 770 SOFTNET_LOCK(); 771 if (ipsec4_input(m, IP_FORWARDING | 772 (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) { 773 SOFTNET_UNLOCK(); 774 goto out; 775 } 776 SOFTNET_UNLOCK(); 777 } 778 #endif 779 ip_forward(m, srcrt, ifp); 780 m_put_rcvif_psref(ifp, &psref); 781 } 782 return; 783 784 ours: 785 m_put_rcvif_psref(ifp, &psref); 786 ifp = NULL; 787 788 /* 789 * If offset or IP_MF are set, must reassemble. 790 */ 791 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 792 /* 793 * Pass to IP reassembly mechanism. 794 */ 795 if (ip_reass_packet(&m, ip) != 0) { 796 /* Failed; invalid fragment(s) or packet. */ 797 goto out; 798 } 799 if (m == NULL) { 800 /* More fragments should come; silently return. */ 801 goto out; 802 } 803 /* 804 * Reassembly is done, we have the final packet. 805 * Updated cached data in local variable(s). 806 */ 807 ip = mtod(m, struct ip *); 808 hlen = ip->ip_hl << 2; 809 } 810 811 #ifdef IPSEC 812 /* 813 * Enforce IPsec policy checking if we are seeing last header. 814 * Note that we do not visit this with protocols with PCB layer 815 * code - like UDP/TCP/raw IP. 816 */ 817 if (ipsec_used && 818 (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { 819 SOFTNET_LOCK(); 820 if (ipsec4_input(m, 0) != 0) { 821 SOFTNET_UNLOCK(); 822 goto out; 823 } 824 SOFTNET_UNLOCK(); 825 } 826 #endif 827 828 /* 829 * Switch out to protocol's input routine. 830 */ 831 #if IFA_STATS 832 if (ia && ip) { 833 struct in_ifaddr *_ia; 834 /* 835 * Keep a reference from ip_match_our_address with psref 836 * is expensive, so explore ia here again. 837 */ 838 s = pserialize_read_enter(); 839 _ia = in_get_ia(ip->ip_dst); 840 _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 841 pserialize_read_exit(s); 842 } 843 #endif 844 IP_STATINC(IP_STAT_DELIVERED); 845 846 const int off = hlen, nh = ip->ip_p; 847 848 SOFTNET_LOCK(); 849 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 850 SOFTNET_UNLOCK(); 851 return; 852 853 out: 854 m_put_rcvif_psref(ifp, &psref); 855 if (m != NULL) 856 m_freem(m); 857 } 858 859 /* 860 * IP timer processing. 861 */ 862 void 863 ip_slowtimo(void) 864 { 865 866 #ifndef NET_MPSAFE 867 mutex_enter(softnet_lock); 868 KERNEL_LOCK(1, NULL); 869 #endif 870 871 ip_reass_slowtimo(); 872 873 #ifndef NET_MPSAFE 874 KERNEL_UNLOCK_ONE(NULL); 875 mutex_exit(softnet_lock); 876 #endif 877 } 878 879 /* 880 * IP drain processing. 881 */ 882 void 883 ip_drain(void) 884 { 885 886 KERNEL_LOCK(1, NULL); 887 ip_reass_drain(); 888 KERNEL_UNLOCK_ONE(NULL); 889 } 890 891 /* 892 * ip_dooptions: perform option processing on a datagram, possibly discarding 893 * it if bad options are encountered, or forwarding it if source-routed. 894 * 895 * => Returns true if packet has been forwarded/freed. 896 * => Returns false if the packet should be processed further. 897 */ 898 static bool 899 ip_dooptions(struct mbuf *m) 900 { 901 struct ip *ip = mtod(m, struct ip *); 902 u_char *cp, *cp0; 903 struct ip_timestamp *ipt; 904 struct in_ifaddr *ia; 905 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 906 struct in_addr dst; 907 n_time ntime; 908 struct ifaddr *ifa = NULL; 909 int s; 910 911 dst = ip->ip_dst; 912 cp = (u_char *)(ip + 1); 913 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 914 for (; cnt > 0; cnt -= optlen, cp += optlen) { 915 opt = cp[IPOPT_OPTVAL]; 916 if (opt == IPOPT_EOL) 917 break; 918 if (opt == IPOPT_NOP) 919 optlen = 1; 920 else { 921 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 922 code = &cp[IPOPT_OLEN] - (u_char *)ip; 923 goto bad; 924 } 925 optlen = cp[IPOPT_OLEN]; 926 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 927 code = &cp[IPOPT_OLEN] - (u_char *)ip; 928 goto bad; 929 } 930 } 931 switch (opt) { 932 933 default: 934 break; 935 936 /* 937 * Source routing with record. 938 * Find interface with current destination address. 939 * If none on this machine then drop if strictly routed, 940 * or do nothing if loosely routed. 941 * Record interface address and bring up next address 942 * component. If strictly routed make sure next 943 * address is on directly accessible net. 944 */ 945 case IPOPT_LSRR: 946 case IPOPT_SSRR: { 947 struct psref psref; 948 struct sockaddr_in ipaddr = { 949 .sin_len = sizeof(ipaddr), 950 .sin_family = AF_INET, 951 }; 952 953 if (ip_allowsrcrt == 0) { 954 type = ICMP_UNREACH; 955 code = ICMP_UNREACH_NET_PROHIB; 956 goto bad; 957 } 958 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 959 code = &cp[IPOPT_OLEN] - (u_char *)ip; 960 goto bad; 961 } 962 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 963 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 964 goto bad; 965 } 966 ipaddr.sin_addr = ip->ip_dst; 967 968 s = pserialize_read_enter(); 969 ifa = ifa_ifwithaddr(sintosa(&ipaddr)); 970 if (ifa == NULL) { 971 pserialize_read_exit(s); 972 if (opt == IPOPT_SSRR) { 973 type = ICMP_UNREACH; 974 code = ICMP_UNREACH_SRCFAIL; 975 goto bad; 976 } 977 /* 978 * Loose routing, and not at next destination 979 * yet; nothing to do except forward. 980 */ 981 break; 982 } 983 pserialize_read_exit(s); 984 985 off--; /* 0 origin */ 986 if ((off + sizeof(struct in_addr)) > optlen) { 987 /* 988 * End of source route. Should be for us. 989 */ 990 save_rte(cp, ip->ip_src); 991 break; 992 } 993 /* 994 * locate outgoing interface 995 */ 996 memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), 997 sizeof(ipaddr.sin_addr)); 998 if (opt == IPOPT_SSRR) { 999 ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr), 1000 &psref); 1001 if (ifa != NULL) 1002 ia = ifatoia(ifa); 1003 else 1004 ia = NULL; 1005 } else { 1006 ia = ip_rtaddr(ipaddr.sin_addr, &psref); 1007 } 1008 if (ia == NULL) { 1009 type = ICMP_UNREACH; 1010 code = ICMP_UNREACH_SRCFAIL; 1011 goto bad; 1012 } 1013 ip->ip_dst = ipaddr.sin_addr; 1014 bcopy((void *)&ia->ia_addr.sin_addr, 1015 (void *)(cp + off), sizeof(struct in_addr)); 1016 ia4_release(ia, &psref); 1017 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1018 /* 1019 * Let ip_intr's mcast routing check handle mcast pkts 1020 */ 1021 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 1022 break; 1023 } 1024 1025 case IPOPT_RR: { 1026 struct psref psref; 1027 struct sockaddr_in ipaddr = { 1028 .sin_len = sizeof(ipaddr), 1029 .sin_family = AF_INET, 1030 }; 1031 1032 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1033 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1034 goto bad; 1035 } 1036 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1037 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1038 goto bad; 1039 } 1040 /* 1041 * If no space remains, ignore. 1042 */ 1043 off--; /* 0 origin */ 1044 if ((off + sizeof(struct in_addr)) > optlen) 1045 break; 1046 memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst), 1047 sizeof(ipaddr.sin_addr)); 1048 /* 1049 * locate outgoing interface; if we're the destination, 1050 * use the incoming interface (should be same). 1051 */ 1052 ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref); 1053 if (ifa == NULL) { 1054 ia = ip_rtaddr(ipaddr.sin_addr, &psref); 1055 if (ia == NULL) { 1056 type = ICMP_UNREACH; 1057 code = ICMP_UNREACH_HOST; 1058 goto bad; 1059 } 1060 } else { 1061 ia = ifatoia(ifa); 1062 } 1063 bcopy((void *)&ia->ia_addr.sin_addr, 1064 (void *)(cp + off), sizeof(struct in_addr)); 1065 ia4_release(ia, &psref); 1066 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1067 break; 1068 } 1069 1070 case IPOPT_TS: 1071 code = cp - (u_char *)ip; 1072 ipt = (struct ip_timestamp *)cp; 1073 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1074 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1075 goto bad; 1076 } 1077 if (ipt->ipt_ptr < 5) { 1078 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1079 goto bad; 1080 } 1081 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 1082 if (++ipt->ipt_oflw == 0) { 1083 code = (u_char *)&ipt->ipt_ptr - 1084 (u_char *)ip; 1085 goto bad; 1086 } 1087 break; 1088 } 1089 cp0 = (cp + ipt->ipt_ptr - 1); 1090 switch (ipt->ipt_flg) { 1091 1092 case IPOPT_TS_TSONLY: 1093 break; 1094 1095 case IPOPT_TS_TSANDADDR: { 1096 struct ifnet *rcvif; 1097 int _s, _ss; 1098 struct sockaddr_in ipaddr = { 1099 .sin_len = sizeof(ipaddr), 1100 .sin_family = AF_INET, 1101 }; 1102 1103 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1104 sizeof(struct in_addr) > ipt->ipt_len) { 1105 code = (u_char *)&ipt->ipt_ptr - 1106 (u_char *)ip; 1107 goto bad; 1108 } 1109 ipaddr.sin_addr = dst; 1110 _ss = pserialize_read_enter(); 1111 rcvif = m_get_rcvif(m, &_s); 1112 if (__predict_true(rcvif != NULL)) { 1113 ifa = ifaof_ifpforaddr(sintosa(&ipaddr), 1114 rcvif); 1115 } 1116 m_put_rcvif(rcvif, &_s); 1117 if (ifa == NULL) { 1118 pserialize_read_exit(_ss); 1119 break; 1120 } 1121 ia = ifatoia(ifa); 1122 bcopy(&ia->ia_addr.sin_addr, 1123 cp0, sizeof(struct in_addr)); 1124 pserialize_read_exit(_ss); 1125 ipt->ipt_ptr += sizeof(struct in_addr); 1126 break; 1127 } 1128 1129 case IPOPT_TS_PRESPEC: { 1130 struct sockaddr_in ipaddr = { 1131 .sin_len = sizeof(ipaddr), 1132 .sin_family = AF_INET, 1133 }; 1134 1135 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1136 sizeof(struct in_addr) > ipt->ipt_len) { 1137 code = (u_char *)&ipt->ipt_ptr - 1138 (u_char *)ip; 1139 goto bad; 1140 } 1141 memcpy(&ipaddr.sin_addr, cp0, 1142 sizeof(struct in_addr)); 1143 s = pserialize_read_enter(); 1144 ifa = ifa_ifwithaddr(sintosa(&ipaddr)); 1145 if (ifa == NULL) { 1146 pserialize_read_exit(s); 1147 continue; 1148 } 1149 pserialize_read_exit(s); 1150 ipt->ipt_ptr += sizeof(struct in_addr); 1151 break; 1152 } 1153 1154 default: 1155 /* XXX can't take &ipt->ipt_flg */ 1156 code = (u_char *)&ipt->ipt_ptr - 1157 (u_char *)ip + 1; 1158 goto bad; 1159 } 1160 ntime = iptime(); 1161 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1162 memmove((char *)cp + ipt->ipt_ptr - 1, cp0, 1163 sizeof(n_time)); 1164 ipt->ipt_ptr += sizeof(n_time); 1165 } 1166 } 1167 if (forward) { 1168 struct ifnet *rcvif; 1169 struct psref _psref; 1170 1171 if (ip_forwsrcrt == 0) { 1172 type = ICMP_UNREACH; 1173 code = ICMP_UNREACH_SRCFAIL; 1174 goto bad; 1175 } 1176 1177 rcvif = m_get_rcvif_psref(m, &_psref); 1178 if (__predict_false(rcvif == NULL)) { 1179 type = ICMP_UNREACH; 1180 code = ICMP_UNREACH_HOST; 1181 goto bad; 1182 } 1183 ip_forward(m, 1, rcvif); 1184 m_put_rcvif_psref(rcvif, &_psref); 1185 return true; 1186 } 1187 return false; 1188 bad: 1189 icmp_error(m, type, code, 0, 0); 1190 IP_STATINC(IP_STAT_BADOPTIONS); 1191 return true; 1192 } 1193 1194 /* 1195 * ip_rtaddr: given address of next destination (final or next hop), 1196 * return internet address info of interface to be used to get there. 1197 */ 1198 static struct in_ifaddr * 1199 ip_rtaddr(struct in_addr dst, struct psref *psref) 1200 { 1201 struct rtentry *rt; 1202 union { 1203 struct sockaddr dst; 1204 struct sockaddr_in dst4; 1205 } u; 1206 struct route *ro; 1207 1208 sockaddr_in_init(&u.dst4, &dst, 0); 1209 1210 ro = percpu_getref(ipforward_rt_percpu); 1211 rt = rtcache_lookup(ro, &u.dst); 1212 if (rt == NULL) { 1213 percpu_putref(ipforward_rt_percpu); 1214 return NULL; 1215 } 1216 1217 ia4_acquire(ifatoia(rt->rt_ifa), psref); 1218 rtcache_unref(rt, ro); 1219 percpu_putref(ipforward_rt_percpu); 1220 1221 return ifatoia(rt->rt_ifa); 1222 } 1223 1224 /* 1225 * save_rte: save incoming source route for use in replies, to be picked 1226 * up later by ip_srcroute if the receiver is interested. 1227 */ 1228 static void 1229 save_rte(u_char *option, struct in_addr dst) 1230 { 1231 unsigned olen; 1232 1233 olen = option[IPOPT_OLEN]; 1234 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1235 return; 1236 memcpy((void *)ip_srcrt.srcopt, (void *)option, olen); 1237 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1238 ip_srcrt.dst = dst; 1239 } 1240 1241 /* 1242 * Retrieve incoming source route for use in replies, 1243 * in the same form used by setsockopt. 1244 * The first hop is placed before the options, will be removed later. 1245 */ 1246 struct mbuf * 1247 ip_srcroute(void) 1248 { 1249 struct in_addr *p, *q; 1250 struct mbuf *m; 1251 1252 if (ip_nhops == 0) 1253 return NULL; 1254 m = m_get(M_DONTWAIT, MT_SOOPTS); 1255 if (m == 0) 1256 return NULL; 1257 1258 MCLAIM(m, &inetdomain.dom_mowner); 1259 #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1260 1261 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1262 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1263 OPTSIZ; 1264 1265 /* 1266 * First save first hop for return route 1267 */ 1268 p = &ip_srcrt.route[ip_nhops - 1]; 1269 *(mtod(m, struct in_addr *)) = *p--; 1270 1271 /* 1272 * Copy option fields and padding (nop) to mbuf. 1273 */ 1274 ip_srcrt.nop = IPOPT_NOP; 1275 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1276 memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop, 1277 OPTSIZ); 1278 q = (struct in_addr *)(mtod(m, char *) + 1279 sizeof(struct in_addr) + OPTSIZ); 1280 #undef OPTSIZ 1281 /* 1282 * Record return path as an IP source route, 1283 * reversing the path (pointers are now aligned). 1284 */ 1285 while (p >= ip_srcrt.route) { 1286 *q++ = *p--; 1287 } 1288 /* 1289 * Last hop goes to final destination. 1290 */ 1291 *q = ip_srcrt.dst; 1292 return (m); 1293 } 1294 1295 const int inetctlerrmap[PRC_NCMDS] = { 1296 [PRC_MSGSIZE] = EMSGSIZE, 1297 [PRC_HOSTDEAD] = EHOSTDOWN, 1298 [PRC_HOSTUNREACH] = EHOSTUNREACH, 1299 [PRC_UNREACH_NET] = EHOSTUNREACH, 1300 [PRC_UNREACH_HOST] = EHOSTUNREACH, 1301 [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, 1302 [PRC_UNREACH_PORT] = ECONNREFUSED, 1303 [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, 1304 [PRC_PARAMPROB] = ENOPROTOOPT, 1305 }; 1306 1307 void 1308 ip_fasttimo(void) 1309 { 1310 if (ip_drainwanted) { 1311 ip_drain(); 1312 ip_drainwanted = 0; 1313 } 1314 } 1315 1316 void 1317 ip_drainstub(void) 1318 { 1319 ip_drainwanted = 1; 1320 } 1321 1322 /* 1323 * Forward a packet. If some error occurs return the sender 1324 * an icmp packet. Note we can't always generate a meaningful 1325 * icmp message because icmp doesn't have a large enough repertoire 1326 * of codes and types. 1327 * 1328 * If not forwarding, just drop the packet. This could be confusing 1329 * if ipforwarding was zero but some routing protocol was advancing 1330 * us as a gateway to somewhere. However, we must let the routing 1331 * protocol deal with that. 1332 * 1333 * The srcrt parameter indicates whether the packet is being forwarded 1334 * via a source route. 1335 */ 1336 static void 1337 ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif) 1338 { 1339 struct ip *ip = mtod(m, struct ip *); 1340 struct rtentry *rt; 1341 int error, type = 0, code = 0, destmtu = 0; 1342 struct mbuf *mcopy; 1343 n_long dest; 1344 union { 1345 struct sockaddr dst; 1346 struct sockaddr_in dst4; 1347 } u; 1348 uint64_t *ips; 1349 struct route *ro; 1350 1351 KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software " 1352 "interrupt handler; synchronization assumptions violated"); 1353 1354 /* 1355 * We are now in the output path. 1356 */ 1357 MCLAIM(m, &ip_tx_mowner); 1358 1359 /* 1360 * Clear any in-bound checksum flags for this packet. 1361 */ 1362 m->m_pkthdr.csum_flags = 0; 1363 1364 dest = 0; 1365 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1366 IP_STATINC(IP_STAT_CANTFORWARD); 1367 m_freem(m); 1368 return; 1369 } 1370 1371 if (ip->ip_ttl <= IPTTLDEC) { 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 = percpu_getref(ipforward_rt_percpu); 1379 rt = rtcache_lookup(ro, &u.dst); 1380 if (rt == NULL) { 1381 percpu_putref(ipforward_rt_percpu); 1382 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); 1383 return; 1384 } 1385 1386 /* 1387 * Save at most 68 bytes of the packet in case 1388 * we need to generate an ICMP message to the src. 1389 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1390 */ 1391 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1392 if (mcopy) 1393 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1394 1395 ip->ip_ttl -= IPTTLDEC; 1396 1397 /* 1398 * If forwarding packet using same interface that it came in on, 1399 * perhaps should send a redirect to sender to shortcut a hop. 1400 * Only send redirect if source is sending directly to us, 1401 * and if packet was not source routed (or has any options). 1402 * Also, don't send redirect if forwarding using a default route 1403 * or a route modified by a redirect. 1404 */ 1405 if (rt->rt_ifp == rcvif && 1406 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1407 !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && 1408 ipsendredirects && !srcrt) { 1409 if (rt->rt_ifa && 1410 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1411 ifatoia(rt->rt_ifa)->ia_subnet) { 1412 if (rt->rt_flags & RTF_GATEWAY) 1413 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1414 else 1415 dest = ip->ip_dst.s_addr; 1416 /* 1417 * Router requirements says to only send host 1418 * redirects. 1419 */ 1420 type = ICMP_REDIRECT; 1421 code = ICMP_REDIRECT_HOST; 1422 } 1423 } 1424 rtcache_unref(rt, ro); 1425 1426 error = ip_output(m, NULL, ro, 1427 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 1428 NULL, NULL); 1429 1430 if (error) { 1431 IP_STATINC(IP_STAT_CANTFORWARD); 1432 goto error; 1433 } 1434 1435 ips = IP_STAT_GETREF(); 1436 ips[IP_STAT_FORWARD]++; 1437 1438 if (type) { 1439 ips[IP_STAT_REDIRECTSENT]++; 1440 IP_STAT_PUTREF(); 1441 goto redirect; 1442 } 1443 1444 IP_STAT_PUTREF(); 1445 if (mcopy) { 1446 #ifdef GATEWAY 1447 if (mcopy->m_flags & M_CANFASTFWD) 1448 ipflow_create(ro, mcopy); 1449 #endif 1450 m_freem(mcopy); 1451 } 1452 1453 percpu_putref(ipforward_rt_percpu); 1454 return; 1455 1456 redirect: 1457 error: 1458 if (mcopy == NULL) { 1459 percpu_putref(ipforward_rt_percpu); 1460 return; 1461 } 1462 1463 switch (error) { 1464 1465 case 0: /* forwarded, but need redirect */ 1466 /* type, code set above */ 1467 break; 1468 1469 case ENETUNREACH: /* shouldn't happen, checked above */ 1470 case EHOSTUNREACH: 1471 case ENETDOWN: 1472 case EHOSTDOWN: 1473 default: 1474 type = ICMP_UNREACH; 1475 code = ICMP_UNREACH_HOST; 1476 break; 1477 1478 case EMSGSIZE: 1479 type = ICMP_UNREACH; 1480 code = ICMP_UNREACH_NEEDFRAG; 1481 1482 if ((rt = rtcache_validate(ro)) != NULL) { 1483 destmtu = rt->rt_ifp->if_mtu; 1484 rtcache_unref(rt, ro); 1485 } 1486 #ifdef IPSEC 1487 if (ipsec_used) 1488 (void)ipsec4_forward(mcopy, &destmtu); 1489 #endif 1490 IP_STATINC(IP_STAT_CANTFRAG); 1491 break; 1492 1493 case ENOBUFS: 1494 /* 1495 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812, 1496 * Requirements for IP Version 4 Routers. Source quench can 1497 * big problem under DoS attacks or if the underlying 1498 * interface is rate-limited. 1499 */ 1500 if (mcopy) 1501 m_freem(mcopy); 1502 percpu_putref(ipforward_rt_percpu); 1503 return; 1504 } 1505 icmp_error(mcopy, type, code, dest, destmtu); 1506 percpu_putref(ipforward_rt_percpu); 1507 } 1508 1509 void 1510 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1511 struct mbuf *m) 1512 { 1513 struct socket *so = inp->inp_socket; 1514 ifnet_t *ifp; 1515 int inpflags = inp->inp_flags; 1516 struct psref psref; 1517 1518 ifp = m_get_rcvif_psref(m, &psref); 1519 if (__predict_false(ifp == NULL)) 1520 return; /* XXX should report error? */ 1521 1522 if (so->so_options & SO_TIMESTAMP 1523 #ifdef SO_OTIMESTAMP 1524 || so->so_options & SO_OTIMESTAMP 1525 #endif 1526 ) { 1527 struct timeval tv; 1528 1529 microtime(&tv); 1530 #ifdef SO_OTIMESTAMP 1531 if (so->so_options & SO_OTIMESTAMP) { 1532 struct timeval50 tv50; 1533 timeval_to_timeval50(&tv, &tv50); 1534 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1535 SCM_OTIMESTAMP, SOL_SOCKET); 1536 } else 1537 #endif 1538 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1539 SCM_TIMESTAMP, SOL_SOCKET); 1540 if (*mp) 1541 mp = &(*mp)->m_next; 1542 } 1543 if (inpflags & INP_RECVDSTADDR) { 1544 *mp = sbcreatecontrol((void *) &ip->ip_dst, 1545 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1546 if (*mp) 1547 mp = &(*mp)->m_next; 1548 } 1549 if (inpflags & INP_RECVPKTINFO) { 1550 struct in_pktinfo ipi; 1551 ipi.ipi_addr = ip->ip_src; 1552 ipi.ipi_ifindex = ifp->if_index; 1553 *mp = sbcreatecontrol((void *) &ipi, 1554 sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP); 1555 if (*mp) 1556 mp = &(*mp)->m_next; 1557 } 1558 if (inpflags & INP_PKTINFO) { 1559 struct in_pktinfo ipi; 1560 ipi.ipi_addr = ip->ip_dst; 1561 ipi.ipi_ifindex = ifp->if_index; 1562 *mp = sbcreatecontrol((void *) &ipi, 1563 sizeof(ipi), IP_PKTINFO, IPPROTO_IP); 1564 if (*mp) 1565 mp = &(*mp)->m_next; 1566 } 1567 if (inpflags & INP_RECVIF) { 1568 struct sockaddr_dl sdl; 1569 1570 sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0, 1571 NULL, 0); 1572 *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); 1573 if (*mp) 1574 mp = &(*mp)->m_next; 1575 } 1576 if (inpflags & INP_RECVTTL) { 1577 *mp = sbcreatecontrol((void *) &ip->ip_ttl, 1578 sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); 1579 if (*mp) 1580 mp = &(*mp)->m_next; 1581 } 1582 m_put_rcvif_psref(ifp, &psref); 1583 } 1584 1585 /* 1586 * sysctl helper routine for net.inet.ip.forwsrcrt. 1587 */ 1588 static int 1589 sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) 1590 { 1591 int error, tmp; 1592 struct sysctlnode node; 1593 1594 node = *rnode; 1595 tmp = ip_forwsrcrt; 1596 node.sysctl_data = &tmp; 1597 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1598 if (error || newp == NULL) 1599 return (error); 1600 1601 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, 1602 0, NULL, NULL, NULL); 1603 if (error) 1604 return (error); 1605 1606 ip_forwsrcrt = tmp; 1607 1608 return (0); 1609 } 1610 1611 /* 1612 * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the 1613 * range of the new value and tweaks timers if it changes. 1614 */ 1615 static int 1616 sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) 1617 { 1618 int error, tmp; 1619 struct sysctlnode node; 1620 1621 icmp_mtudisc_lock(); 1622 1623 node = *rnode; 1624 tmp = ip_mtudisc_timeout; 1625 node.sysctl_data = &tmp; 1626 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1627 if (error || newp == NULL) 1628 goto out; 1629 if (tmp < 0) { 1630 error = EINVAL; 1631 goto out; 1632 } 1633 1634 ip_mtudisc_timeout = tmp; 1635 rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); 1636 error = 0; 1637 out: 1638 icmp_mtudisc_unlock(); 1639 return error; 1640 } 1641 1642 static int 1643 sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) 1644 { 1645 1646 return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); 1647 } 1648 1649 static void 1650 sysctl_net_inet_ip_setup(struct sysctllog **clog) 1651 { 1652 sysctl_createv(clog, 0, NULL, NULL, 1653 CTLFLAG_PERMANENT, 1654 CTLTYPE_NODE, "inet", 1655 SYSCTL_DESCR("PF_INET related settings"), 1656 NULL, 0, NULL, 0, 1657 CTL_NET, PF_INET, CTL_EOL); 1658 sysctl_createv(clog, 0, NULL, NULL, 1659 CTLFLAG_PERMANENT, 1660 CTLTYPE_NODE, "ip", 1661 SYSCTL_DESCR("IPv4 related settings"), 1662 NULL, 0, NULL, 0, 1663 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 1664 1665 sysctl_createv(clog, 0, NULL, NULL, 1666 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1667 CTLTYPE_INT, "forwarding", 1668 SYSCTL_DESCR("Enable forwarding of INET datagrams"), 1669 NULL, 0, &ipforwarding, 0, 1670 CTL_NET, PF_INET, IPPROTO_IP, 1671 IPCTL_FORWARDING, CTL_EOL); 1672 sysctl_createv(clog, 0, NULL, NULL, 1673 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1674 CTLTYPE_INT, "redirect", 1675 SYSCTL_DESCR("Enable sending of ICMP redirect messages"), 1676 NULL, 0, &ipsendredirects, 0, 1677 CTL_NET, PF_INET, IPPROTO_IP, 1678 IPCTL_SENDREDIRECTS, CTL_EOL); 1679 sysctl_createv(clog, 0, NULL, NULL, 1680 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1681 CTLTYPE_INT, "ttl", 1682 SYSCTL_DESCR("Default TTL for an INET datagram"), 1683 NULL, 0, &ip_defttl, 0, 1684 CTL_NET, PF_INET, IPPROTO_IP, 1685 IPCTL_DEFTTL, CTL_EOL); 1686 #ifdef IPCTL_DEFMTU 1687 sysctl_createv(clog, 0, NULL, NULL, 1688 CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */, 1689 CTLTYPE_INT, "mtu", 1690 SYSCTL_DESCR("Default MTA for an INET route"), 1691 NULL, 0, &ip_mtu, 0, 1692 CTL_NET, PF_INET, IPPROTO_IP, 1693 IPCTL_DEFMTU, CTL_EOL); 1694 #endif /* IPCTL_DEFMTU */ 1695 sysctl_createv(clog, 0, NULL, NULL, 1696 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1697 CTLTYPE_INT, "forwsrcrt", 1698 SYSCTL_DESCR("Enable forwarding of source-routed " 1699 "datagrams"), 1700 sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, 1701 CTL_NET, PF_INET, IPPROTO_IP, 1702 IPCTL_FORWSRCRT, CTL_EOL); 1703 sysctl_createv(clog, 0, NULL, NULL, 1704 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1705 CTLTYPE_INT, "directed-broadcast", 1706 SYSCTL_DESCR("Enable forwarding of broadcast datagrams"), 1707 NULL, 0, &ip_directedbcast, 0, 1708 CTL_NET, PF_INET, IPPROTO_IP, 1709 IPCTL_DIRECTEDBCAST, CTL_EOL); 1710 sysctl_createv(clog, 0, NULL, NULL, 1711 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1712 CTLTYPE_INT, "allowsrcrt", 1713 SYSCTL_DESCR("Accept source-routed datagrams"), 1714 NULL, 0, &ip_allowsrcrt, 0, 1715 CTL_NET, PF_INET, IPPROTO_IP, 1716 IPCTL_ALLOWSRCRT, CTL_EOL); 1717 1718 sysctl_createv(clog, 0, NULL, NULL, 1719 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1720 CTLTYPE_INT, "mtudisc", 1721 SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"), 1722 NULL, 0, &ip_mtudisc, 0, 1723 CTL_NET, PF_INET, IPPROTO_IP, 1724 IPCTL_MTUDISC, CTL_EOL); 1725 sysctl_createv(clog, 0, NULL, NULL, 1726 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1727 CTLTYPE_INT, "anonportmin", 1728 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1729 sysctl_net_inet_ip_ports, 0, &anonportmin, 0, 1730 CTL_NET, PF_INET, IPPROTO_IP, 1731 IPCTL_ANONPORTMIN, CTL_EOL); 1732 sysctl_createv(clog, 0, NULL, NULL, 1733 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1734 CTLTYPE_INT, "anonportmax", 1735 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1736 sysctl_net_inet_ip_ports, 0, &anonportmax, 0, 1737 CTL_NET, PF_INET, IPPROTO_IP, 1738 IPCTL_ANONPORTMAX, CTL_EOL); 1739 sysctl_createv(clog, 0, NULL, NULL, 1740 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1741 CTLTYPE_INT, "mtudisctimeout", 1742 SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"), 1743 sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0, 1744 CTL_NET, PF_INET, IPPROTO_IP, 1745 IPCTL_MTUDISCTIMEOUT, CTL_EOL); 1746 #ifndef IPNOPRIVPORTS 1747 sysctl_createv(clog, 0, NULL, NULL, 1748 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1749 CTLTYPE_INT, "lowportmin", 1750 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1751 "to assign"), 1752 sysctl_net_inet_ip_ports, 0, &lowportmin, 0, 1753 CTL_NET, PF_INET, IPPROTO_IP, 1754 IPCTL_LOWPORTMIN, CTL_EOL); 1755 sysctl_createv(clog, 0, NULL, NULL, 1756 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1757 CTLTYPE_INT, "lowportmax", 1758 SYSCTL_DESCR("Highest privileged ephemeral port number " 1759 "to assign"), 1760 sysctl_net_inet_ip_ports, 0, &lowportmax, 0, 1761 CTL_NET, PF_INET, IPPROTO_IP, 1762 IPCTL_LOWPORTMAX, CTL_EOL); 1763 #endif /* IPNOPRIVPORTS */ 1764 #if NGRE > 0 1765 sysctl_createv(clog, 0, NULL, NULL, 1766 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1767 CTLTYPE_INT, "grettl", 1768 SYSCTL_DESCR("Default TTL for a gre tunnel datagram"), 1769 NULL, 0, &ip_gre_ttl, 0, 1770 CTL_NET, PF_INET, IPPROTO_IP, 1771 IPCTL_GRE_TTL, CTL_EOL); 1772 #endif /* NGRE */ 1773 sysctl_createv(clog, 0, NULL, NULL, 1774 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1775 CTLTYPE_INT, "checkinterface", 1776 SYSCTL_DESCR("Enable receive side of Strong ES model " 1777 "from RFC1122"), 1778 NULL, 0, &ip_checkinterface, 0, 1779 CTL_NET, PF_INET, IPPROTO_IP, 1780 IPCTL_CHECKINTERFACE, CTL_EOL); 1781 sysctl_createv(clog, 0, NULL, NULL, 1782 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1783 CTLTYPE_INT, "random_id", 1784 SYSCTL_DESCR("Assign random ip_id values"), 1785 NULL, 0, &ip_do_randomid, 0, 1786 CTL_NET, PF_INET, IPPROTO_IP, 1787 IPCTL_RANDOMID, CTL_EOL); 1788 sysctl_createv(clog, 0, NULL, NULL, 1789 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1790 CTLTYPE_INT, "do_loopback_cksum", 1791 SYSCTL_DESCR("Perform IP checksum on loopback"), 1792 NULL, 0, &ip_do_loopback_cksum, 0, 1793 CTL_NET, PF_INET, IPPROTO_IP, 1794 IPCTL_LOOPBACKCKSUM, CTL_EOL); 1795 sysctl_createv(clog, 0, NULL, NULL, 1796 CTLFLAG_PERMANENT, 1797 CTLTYPE_STRUCT, "stats", 1798 SYSCTL_DESCR("IP statistics"), 1799 sysctl_net_inet_ip_stats, 0, NULL, 0, 1800 CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, 1801 CTL_EOL); 1802 #if NARP 1803 sysctl_createv(clog, 0, NULL, NULL, 1804 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1805 CTLTYPE_INT, "dad_count", 1806 SYSCTL_DESCR("Number of Duplicate Address Detection " 1807 "probes to send"), 1808 NULL, 0, &ip_dad_count, 0, 1809 CTL_NET, PF_INET, IPPROTO_IP, 1810 IPCTL_DAD_COUNT, CTL_EOL); 1811 #endif 1812 1813 /* anonportalgo RFC6056 subtree */ 1814 const struct sysctlnode *portalgo_node; 1815 sysctl_createv(clog, 0, NULL, &portalgo_node, 1816 CTLFLAG_PERMANENT, 1817 CTLTYPE_NODE, "anonportalgo", 1818 SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"), 1819 NULL, 0, NULL, 0, 1820 CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL); 1821 sysctl_createv(clog, 0, &portalgo_node, NULL, 1822 CTLFLAG_PERMANENT, 1823 CTLTYPE_STRING, "available", 1824 SYSCTL_DESCR("available algorithms"), 1825 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1826 CTL_CREATE, CTL_EOL); 1827 sysctl_createv(clog, 0, &portalgo_node, NULL, 1828 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1829 CTLTYPE_STRING, "selected", 1830 SYSCTL_DESCR("selected algorithm"), 1831 sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN, 1832 CTL_CREATE, CTL_EOL); 1833 sysctl_createv(clog, 0, &portalgo_node, NULL, 1834 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1835 CTLTYPE_STRUCT, "reserve", 1836 SYSCTL_DESCR("bitmap of reserved ports"), 1837 sysctl_portalgo_reserve4, 0, NULL, 0, 1838 CTL_CREATE, CTL_EOL); 1839 } 1840 1841 void 1842 ip_statinc(u_int stat) 1843 { 1844 1845 KASSERT(stat < IP_NSTATS); 1846 IP_STATINC(stat); 1847 } 1848
Indexes created Wed Sep 24 14:09:57 GMT 2025