ip_input.c revision 1.355.2.5
1 /* $NetBSD: ip_input.c,v 1.355.2.5 2018/02/26 13:32:01 martin 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 1.355.2.5 2018/02/26 13:32:01 martin 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 0 /* forward source-routed packets */ 166 #endif 167 #ifndef IPALLOWSRCRT 168 #define IPALLOWSRCRT 0 /* 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 * Used 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 struct ip_srcrt { 263 int isr_nhops; /* number of hops */ 264 struct in_addr isr_dst; /* final destination */ 265 char isr_nop; /* one NOP to align */ 266 char isr_hdr[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN & OFFSET */ 267 struct in_addr isr_routes[MAX_IPOPTLEN/sizeof(struct in_addr)]; 268 }; 269 270 static int ip_drainwanted; 271 272 static void save_rte(struct mbuf *, u_char *, struct in_addr); 273 274 #ifdef MBUFTRACE 275 struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx"); 276 struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx"); 277 #endif 278 279 static void ipintr(void *); 280 static void ip_input(struct mbuf *); 281 static void ip_forward(struct mbuf *, int, struct ifnet *); 282 static bool ip_dooptions(struct mbuf *); 283 static struct in_ifaddr *ip_rtaddr(struct in_addr, struct psref *); 284 static void sysctl_net_inet_ip_setup(struct sysctllog **); 285 286 static struct in_ifaddr *ip_match_our_address(struct ifnet *, struct ip *, 287 int *); 288 static struct in_ifaddr *ip_match_our_address_broadcast(struct ifnet *, 289 struct ip *); 290 291 #ifdef NET_MPSAFE 292 #define SOFTNET_LOCK() mutex_enter(softnet_lock) 293 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) 294 #else 295 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) 296 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) 297 #endif 298 299 /* 300 * IP initialization: fill in IP protocol switch table. 301 * All protocols not implemented in kernel go to raw IP protocol handler. 302 */ 303 void 304 ip_init(void) 305 { 306 const struct protosw *pr; 307 308 in_init(); 309 sysctl_net_inet_ip_setup(NULL); 310 311 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 312 KASSERT(pr != NULL); 313 314 ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL); 315 KASSERT(ip_pktq != NULL); 316 317 for (u_int i = 0; i < IPPROTO_MAX; i++) { 318 ip_protox[i] = pr - inetsw; 319 } 320 for (pr = inetdomain.dom_protosw; 321 pr < inetdomain.dom_protoswNPROTOSW; pr++) 322 if (pr->pr_domain->dom_family == PF_INET && 323 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 324 ip_protox[pr->pr_protocol] = pr - inetsw; 325 326 ip_reass_init(); 327 328 ip_ids = ip_id_init(); 329 ip_id = time_uptime & 0xfffff; 330 331 #ifdef GATEWAY 332 ipflow_init(); 333 #endif 334 335 /* Register our Packet Filter hook. */ 336 inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET); 337 KASSERT(inet_pfil_hook != NULL); 338 339 #ifdef MBUFTRACE 340 MOWNER_ATTACH(&ip_tx_mowner); 341 MOWNER_ATTACH(&ip_rx_mowner); 342 #endif /* MBUFTRACE */ 343 344 ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS); 345 ipforward_rt_percpu = percpu_alloc(sizeof(struct route)); 346 ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); 347 } 348 349 static struct in_ifaddr * 350 ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch) 351 { 352 struct in_ifaddr *ia = NULL; 353 int checkif; 354 355 /* 356 * Enable a consistency check between the destination address 357 * and the arrival interface for a unicast packet (the RFC 1122 358 * strong ES model) if IP forwarding is disabled and the packet 359 * is not locally generated. 360 * 361 * XXX - Checking also should be disabled if the destination 362 * address is ipnat'ed to a different interface. 363 * 364 * XXX - Checking is incompatible with IP aliases added 365 * to the loopback interface instead of the interface where 366 * the packets are received. 367 * 368 * XXX - We need to add a per ifaddr flag for this so that 369 * we get finer grain control. 370 */ 371 checkif = ip_checkinterface && (ipforwarding == 0) && 372 (ifp->if_flags & IFF_LOOPBACK) == 0; 373 374 IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) { 375 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 376 if (ia->ia4_flags & IN_IFF_NOTREADY) 377 continue; 378 if (checkif && ia->ia_ifp != ifp) 379 continue; 380 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) { 381 (*downmatch)++; 382 continue; 383 } 384 if (ia->ia4_flags & IN_IFF_DETACHED && 385 (ifp->if_flags & IFF_LOOPBACK) == 0) 386 continue; 387 break; 388 } 389 } 390 391 return ia; 392 } 393 394 static struct in_ifaddr * 395 ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip) 396 { 397 struct in_ifaddr *ia = NULL; 398 struct ifaddr *ifa; 399 400 IFADDR_READER_FOREACH(ifa, ifp) { 401 if (ifa->ifa_addr->sa_family != AF_INET) 402 continue; 403 ia = ifatoia(ifa); 404 if (ia->ia4_flags & IN_IFF_NOTREADY) 405 continue; 406 if (ia->ia4_flags & IN_IFF_DETACHED && 407 (ifp->if_flags & IFF_LOOPBACK) == 0) 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 SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); 442 while ((m = pktq_dequeue(ip_pktq)) != NULL) { 443 ip_input(m); 444 } 445 SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 446 } 447 448 /* 449 * IP input routine. Checksum and byte swap header. If fragmented 450 * try to reassemble. Process options. Pass to next level. 451 */ 452 static void 453 ip_input(struct mbuf *m) 454 { 455 struct ip *ip = NULL; 456 struct in_ifaddr *ia = NULL; 457 int hlen = 0, len; 458 int downmatch; 459 int srcrt = 0; 460 ifnet_t *ifp; 461 struct psref psref; 462 int s; 463 464 KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software " 465 "interrupt handler; synchronization assumptions violated"); 466 467 MCLAIM(m, &ip_rx_mowner); 468 KASSERT((m->m_flags & M_PKTHDR) != 0); 469 470 ifp = m_get_rcvif_psref(m, &psref); 471 if (__predict_false(ifp == NULL)) 472 goto out; 473 474 /* 475 * If no IP addresses have been set yet but the interfaces 476 * are receiving, can't do anything with incoming packets yet. 477 * Note: we pre-check without locks held. 478 */ 479 if (IN_ADDRLIST_READER_EMPTY()) 480 goto out; 481 IP_STATINC(IP_STAT_TOTAL); 482 483 /* 484 * If the IP header is not aligned, slurp it up into a new 485 * mbuf with space for link headers, in the event we forward 486 * it. Otherwise, if it is aligned, make sure the entire 487 * base IP header is in the first mbuf of the chain. 488 */ 489 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 490 if ((m = m_copyup(m, sizeof(struct ip), 491 (max_linkhdr + 3) & ~3)) == NULL) { 492 /* XXXJRT new stat, please */ 493 IP_STATINC(IP_STAT_TOOSMALL); 494 goto out; 495 } 496 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 497 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 498 IP_STATINC(IP_STAT_TOOSMALL); 499 goto out; 500 } 501 } 502 ip = mtod(m, struct ip *); 503 if (ip->ip_v != IPVERSION) { 504 IP_STATINC(IP_STAT_BADVERS); 505 goto out; 506 } 507 hlen = ip->ip_hl << 2; 508 if (hlen < sizeof(struct ip)) { /* minimum header length */ 509 IP_STATINC(IP_STAT_BADHLEN); 510 goto out; 511 } 512 if (hlen > m->m_len) { 513 if ((m = m_pullup(m, hlen)) == NULL) { 514 IP_STATINC(IP_STAT_BADHLEN); 515 goto out; 516 } 517 ip = mtod(m, struct ip *); 518 } 519 520 /* 521 * RFC1122: packets with a multicast source address are 522 * not allowed. 523 */ 524 if (IN_MULTICAST(ip->ip_src.s_addr)) { 525 IP_STATINC(IP_STAT_BADADDR); 526 goto out; 527 } 528 529 /* 127/8 must not appear on wire - RFC1122 */ 530 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 531 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 532 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 533 IP_STATINC(IP_STAT_BADADDR); 534 goto out; 535 } 536 } 537 538 switch (m->m_pkthdr.csum_flags & 539 ((ifp->if_csum_flags_rx & M_CSUM_IPv4) | 540 M_CSUM_IPv4_BAD)) { 541 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 542 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 543 IP_STATINC(IP_STAT_BADSUM); 544 goto out; 545 546 case M_CSUM_IPv4: 547 /* Checksum was okay. */ 548 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 549 break; 550 551 default: 552 /* 553 * Must compute it ourselves. Maybe skip checksum on 554 * loopback interfaces. 555 */ 556 if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) || 557 ip_do_loopback_cksum)) { 558 INET_CSUM_COUNTER_INCR(&ip_swcsum); 559 if (in_cksum(m, hlen) != 0) { 560 IP_STATINC(IP_STAT_BADSUM); 561 goto out; 562 } 563 } 564 break; 565 } 566 567 /* Retrieve the packet length. */ 568 len = ntohs(ip->ip_len); 569 570 /* 571 * Check for additional length bogosity 572 */ 573 if (len < hlen) { 574 IP_STATINC(IP_STAT_BADLEN); 575 goto out; 576 } 577 578 /* 579 * Check that the amount of data in the buffers 580 * is as at least much as the IP header would have us expect. 581 * Trim mbufs if longer than we expect. 582 * Drop packet if shorter than we expect. 583 */ 584 if (m->m_pkthdr.len < len) { 585 IP_STATINC(IP_STAT_TOOSHORT); 586 goto out; 587 } 588 if (m->m_pkthdr.len > len) { 589 if (m->m_len == m->m_pkthdr.len) { 590 m->m_len = len; 591 m->m_pkthdr.len = len; 592 } else 593 m_adj(m, len - m->m_pkthdr.len); 594 } 595 596 /* 597 * Assume that we can create a fast-forward IP flow entry 598 * based on this packet. 599 */ 600 m->m_flags |= M_CANFASTFWD; 601 602 /* 603 * Run through list of hooks for input packets. If there are any 604 * filters which require that additional packets in the flow are 605 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 606 * Note that filters must _never_ set this flag, as another filter 607 * in the list may have previously cleared it. 608 */ 609 #if defined(IPSEC) 610 if (!ipsec_used || !ipsec_indone(m)) 611 #else 612 if (1) 613 #endif 614 { 615 struct in_addr odst = ip->ip_dst; 616 bool freed; 617 618 freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0; 619 if (freed || m == NULL) { 620 m = NULL; 621 goto out; 622 } 623 ip = mtod(m, struct ip *); 624 hlen = ip->ip_hl << 2; 625 626 /* 627 * XXX The setting of "srcrt" here is to prevent ip_forward() 628 * from generating ICMP redirects for packets that have 629 * been redirected by a hook back out on to the same LAN that 630 * they came from and is not an indication that the packet 631 * is being inffluenced by source routing options. This 632 * allows things like 633 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" 634 * where tlp0 is both on the 1.1.1.0/24 network and is the 635 * default route for hosts on 1.1.1.0/24. Of course this 636 * also requires a "map tlp0 ..." to complete the story. 637 * One might argue whether or not this kind of network config. 638 * should be supported in this manner... 639 */ 640 srcrt = (odst.s_addr != ip->ip_dst.s_addr); 641 } 642 643 #ifdef ALTQ 644 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 645 if (altq_input) { 646 SOFTNET_LOCK(); 647 if ((*altq_input)(m, AF_INET) == 0) { 648 /* Packet dropped by traffic conditioner. */ 649 SOFTNET_UNLOCK(); 650 m = NULL; 651 goto out; 652 } 653 SOFTNET_UNLOCK(); 654 } 655 #endif 656 657 /* 658 * Process options and, if not destined for us, 659 * ship it on. ip_dooptions returns 1 when an 660 * error was detected (causing an icmp message 661 * to be sent and the original packet to be freed). 662 */ 663 if (hlen > sizeof (struct ip) && ip_dooptions(m)) { 664 m = NULL; 665 goto out; 666 } 667 668 /* 669 * Check our list of addresses, to see if the packet is for us. 670 * 671 * Traditional 4.4BSD did not consult IFF_UP at all. 672 * The behavior here is to treat addresses on !IFF_UP interface 673 * or IN_IFF_NOTREADY addresses as not mine. 674 */ 675 downmatch = 0; 676 s = pserialize_read_enter(); 677 ia = ip_match_our_address(ifp, ip, &downmatch); 678 if (ia != NULL) { 679 pserialize_read_exit(s); 680 goto ours; 681 } 682 683 if (ifp->if_flags & IFF_BROADCAST) { 684 ia = ip_match_our_address_broadcast(ifp, ip); 685 if (ia != NULL) { 686 pserialize_read_exit(s); 687 goto ours; 688 } 689 } 690 pserialize_read_exit(s); 691 692 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 693 #ifdef MROUTING 694 extern struct socket *ip_mrouter; 695 696 if (ip_mrouter) { 697 /* 698 * If we are acting as a multicast router, all 699 * incoming multicast packets are passed to the 700 * kernel-level multicast forwarding function. 701 * The packet is returned (relatively) intact; if 702 * ip_mforward() returns a non-zero value, the packet 703 * must be discarded, else it may be accepted below. 704 * 705 * (The IP ident field is put in the same byte order 706 * as expected when ip_mforward() is called from 707 * ip_output().) 708 */ 709 SOFTNET_LOCK(); 710 if (ip_mforward(m, ifp) != 0) { 711 SOFTNET_UNLOCK(); 712 IP_STATINC(IP_STAT_CANTFORWARD); 713 goto out; 714 } 715 SOFTNET_UNLOCK(); 716 717 /* 718 * The process-level routing demon needs to receive 719 * all multicast IGMP packets, whether or not this 720 * host belongs to their destination groups. 721 */ 722 if (ip->ip_p == IPPROTO_IGMP) { 723 goto ours; 724 } 725 IP_STATINC(IP_STAT_CANTFORWARD); 726 } 727 #endif 728 /* 729 * See if we belong to the destination multicast group on the 730 * arrival interface. 731 */ 732 if (!in_multi_group(ip->ip_dst, ifp, 0)) { 733 IP_STATINC(IP_STAT_CANTFORWARD); 734 goto out; 735 } 736 goto ours; 737 } 738 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 739 in_nullhost(ip->ip_dst)) 740 goto ours; 741 742 /* 743 * Not for us; forward if possible and desirable. 744 */ 745 if (ipforwarding == 0) { 746 m_put_rcvif_psref(ifp, &psref); 747 IP_STATINC(IP_STAT_CANTFORWARD); 748 m_freem(m); 749 } else { 750 /* 751 * If ip_dst matched any of my address on !IFF_UP interface, 752 * and there's no IFF_UP interface that matches ip_dst, 753 * send icmp unreach. Forwarding it will result in in-kernel 754 * forwarding loop till TTL goes to 0. 755 */ 756 if (downmatch) { 757 m_put_rcvif_psref(ifp, &psref); 758 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 759 IP_STATINC(IP_STAT_CANTFORWARD); 760 return; 761 } 762 #ifdef IPSEC 763 /* Check the security policy (SP) for the packet */ 764 if (ipsec_used) { 765 if (ipsec4_input(m, IP_FORWARDING | 766 (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) { 767 goto out; 768 } 769 } 770 #endif 771 ip_forward(m, srcrt, ifp); 772 m_put_rcvif_psref(ifp, &psref); 773 } 774 return; 775 776 ours: 777 m_put_rcvif_psref(ifp, &psref); 778 ifp = NULL; 779 780 /* 781 * If offset or IP_MF are set, must reassemble. 782 */ 783 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 784 /* 785 * Pass to IP reassembly mechanism. 786 */ 787 if (ip_reass_packet(&m, ip) != 0) { 788 /* Failed; invalid fragment(s) or packet. */ 789 goto out; 790 } 791 if (m == NULL) { 792 /* More fragments should come; silently return. */ 793 goto out; 794 } 795 /* 796 * Reassembly is done, we have the final packet. 797 * Updated cached data in local variable(s). 798 */ 799 ip = mtod(m, struct ip *); 800 hlen = ip->ip_hl << 2; 801 } 802 803 #ifdef IPSEC 804 /* 805 * Enforce IPsec policy checking if we are seeing last header. 806 * Note that we do not visit this with protocols with PCB layer 807 * code - like UDP/TCP/raw IP. 808 */ 809 if (ipsec_used && 810 (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { 811 if (ipsec4_input(m, 0) != 0) { 812 goto out; 813 } 814 } 815 #endif 816 817 /* 818 * Switch out to protocol's input routine. 819 */ 820 #if IFA_STATS 821 if (ia && ip) { 822 struct in_ifaddr *_ia; 823 /* 824 * Keep a reference from ip_match_our_address with psref 825 * is expensive, so explore ia here again. 826 */ 827 s = pserialize_read_enter(); 828 _ia = in_get_ia(ip->ip_dst); 829 _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 830 pserialize_read_exit(s); 831 } 832 #endif 833 IP_STATINC(IP_STAT_DELIVERED); 834 835 const int off = hlen, nh = ip->ip_p; 836 837 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 838 return; 839 840 out: 841 m_put_rcvif_psref(ifp, &psref); 842 if (m != NULL) 843 m_freem(m); 844 } 845 846 /* 847 * IP timer processing. 848 */ 849 void 850 ip_slowtimo(void) 851 { 852 853 SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); 854 855 ip_reass_slowtimo(); 856 857 SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 858 } 859 860 /* 861 * IP drain processing. 862 */ 863 void 864 ip_drain(void) 865 { 866 867 KERNEL_LOCK(1, NULL); 868 ip_reass_drain(); 869 KERNEL_UNLOCK_ONE(NULL); 870 } 871 872 /* 873 * ip_dooptions: perform option processing on a datagram, possibly discarding 874 * it if bad options are encountered, or forwarding it if source-routed. 875 * 876 * => Returns true if packet has been forwarded/freed. 877 * => Returns false if the packet should be processed further. 878 */ 879 static bool 880 ip_dooptions(struct mbuf *m) 881 { 882 struct ip *ip = mtod(m, struct ip *); 883 u_char *cp, *cp0; 884 struct ip_timestamp *ipt; 885 struct in_ifaddr *ia; 886 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 887 struct in_addr dst; 888 n_time ntime; 889 struct ifaddr *ifa = NULL; 890 int s; 891 892 dst = ip->ip_dst; 893 cp = (u_char *)(ip + 1); 894 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 895 for (; cnt > 0; cnt -= optlen, cp += optlen) { 896 opt = cp[IPOPT_OPTVAL]; 897 if (opt == IPOPT_EOL) 898 break; 899 if (opt == IPOPT_NOP) 900 optlen = 1; 901 else { 902 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 903 code = &cp[IPOPT_OLEN] - (u_char *)ip; 904 goto bad; 905 } 906 optlen = cp[IPOPT_OLEN]; 907 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 908 code = &cp[IPOPT_OLEN] - (u_char *)ip; 909 goto bad; 910 } 911 } 912 switch (opt) { 913 914 default: 915 break; 916 917 /* 918 * Source routing with record. 919 * Find interface with current destination address. 920 * If none on this machine then drop if strictly routed, 921 * or do nothing if loosely routed. 922 * Record interface address and bring up next address 923 * component. If strictly routed make sure next 924 * address is on directly accessible net. 925 */ 926 case IPOPT_LSRR: 927 case IPOPT_SSRR: { 928 struct psref psref; 929 struct sockaddr_in ipaddr = { 930 .sin_len = sizeof(ipaddr), 931 .sin_family = AF_INET, 932 }; 933 934 if (ip_allowsrcrt == 0) { 935 type = ICMP_UNREACH; 936 code = ICMP_UNREACH_NET_PROHIB; 937 goto bad; 938 } 939 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 940 code = &cp[IPOPT_OLEN] - (u_char *)ip; 941 goto bad; 942 } 943 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 944 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 945 goto bad; 946 } 947 ipaddr.sin_addr = ip->ip_dst; 948 949 s = pserialize_read_enter(); 950 ifa = ifa_ifwithaddr(sintosa(&ipaddr)); 951 if (ifa == NULL) { 952 pserialize_read_exit(s); 953 if (opt == IPOPT_SSRR) { 954 type = ICMP_UNREACH; 955 code = ICMP_UNREACH_SRCFAIL; 956 goto bad; 957 } 958 /* 959 * Loose routing, and not at next destination 960 * yet; nothing to do except forward. 961 */ 962 break; 963 } 964 pserialize_read_exit(s); 965 966 off--; /* 0 origin */ 967 if ((off + sizeof(struct in_addr)) > optlen) { 968 /* 969 * End of source route. Should be for us. 970 */ 971 save_rte(m, cp, ip->ip_src); 972 break; 973 } 974 /* 975 * locate outgoing interface 976 */ 977 memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), 978 sizeof(ipaddr.sin_addr)); 979 if (opt == IPOPT_SSRR) { 980 ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr), 981 &psref); 982 if (ifa != NULL) 983 ia = ifatoia(ifa); 984 else 985 ia = NULL; 986 } else { 987 ia = ip_rtaddr(ipaddr.sin_addr, &psref); 988 } 989 if (ia == NULL) { 990 type = ICMP_UNREACH; 991 code = ICMP_UNREACH_SRCFAIL; 992 goto bad; 993 } 994 ip->ip_dst = ipaddr.sin_addr; 995 bcopy((void *)&ia->ia_addr.sin_addr, 996 (void *)(cp + off), sizeof(struct in_addr)); 997 ia4_release(ia, &psref); 998 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 999 /* 1000 * Let ip_intr's mcast routing check handle mcast pkts 1001 */ 1002 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 1003 break; 1004 } 1005 1006 case IPOPT_RR: { 1007 struct psref psref; 1008 struct sockaddr_in ipaddr = { 1009 .sin_len = sizeof(ipaddr), 1010 .sin_family = AF_INET, 1011 }; 1012 1013 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 1014 code = &cp[IPOPT_OLEN] - (u_char *)ip; 1015 goto bad; 1016 } 1017 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 1018 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 1019 goto bad; 1020 } 1021 /* 1022 * If no space remains, ignore. 1023 */ 1024 off--; /* 0 origin */ 1025 if ((off + sizeof(struct in_addr)) > optlen) 1026 break; 1027 memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst), 1028 sizeof(ipaddr.sin_addr)); 1029 /* 1030 * locate outgoing interface; if we're the destination, 1031 * use the incoming interface (should be same). 1032 */ 1033 ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref); 1034 if (ifa == NULL) { 1035 ia = ip_rtaddr(ipaddr.sin_addr, &psref); 1036 if (ia == NULL) { 1037 type = ICMP_UNREACH; 1038 code = ICMP_UNREACH_HOST; 1039 goto bad; 1040 } 1041 } else { 1042 ia = ifatoia(ifa); 1043 } 1044 bcopy((void *)&ia->ia_addr.sin_addr, 1045 (void *)(cp + off), sizeof(struct in_addr)); 1046 ia4_release(ia, &psref); 1047 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 1048 break; 1049 } 1050 1051 case IPOPT_TS: 1052 code = cp - (u_char *)ip; 1053 ipt = (struct ip_timestamp *)cp; 1054 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 1055 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 1056 goto bad; 1057 } 1058 if (ipt->ipt_ptr < 5) { 1059 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 1060 goto bad; 1061 } 1062 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 1063 if (++ipt->ipt_oflw == 0) { 1064 code = (u_char *)&ipt->ipt_ptr - 1065 (u_char *)ip; 1066 goto bad; 1067 } 1068 break; 1069 } 1070 cp0 = (cp + ipt->ipt_ptr - 1); 1071 switch (ipt->ipt_flg) { 1072 1073 case IPOPT_TS_TSONLY: 1074 break; 1075 1076 case IPOPT_TS_TSANDADDR: { 1077 struct ifnet *rcvif; 1078 int _s, _ss; 1079 struct sockaddr_in ipaddr = { 1080 .sin_len = sizeof(ipaddr), 1081 .sin_family = AF_INET, 1082 }; 1083 1084 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1085 sizeof(struct in_addr) > ipt->ipt_len) { 1086 code = (u_char *)&ipt->ipt_ptr - 1087 (u_char *)ip; 1088 goto bad; 1089 } 1090 ipaddr.sin_addr = dst; 1091 _ss = pserialize_read_enter(); 1092 rcvif = m_get_rcvif(m, &_s); 1093 if (__predict_true(rcvif != NULL)) { 1094 ifa = ifaof_ifpforaddr(sintosa(&ipaddr), 1095 rcvif); 1096 } 1097 m_put_rcvif(rcvif, &_s); 1098 if (ifa == NULL) { 1099 pserialize_read_exit(_ss); 1100 break; 1101 } 1102 ia = ifatoia(ifa); 1103 bcopy(&ia->ia_addr.sin_addr, 1104 cp0, sizeof(struct in_addr)); 1105 pserialize_read_exit(_ss); 1106 ipt->ipt_ptr += sizeof(struct in_addr); 1107 break; 1108 } 1109 1110 case IPOPT_TS_PRESPEC: { 1111 struct sockaddr_in ipaddr = { 1112 .sin_len = sizeof(ipaddr), 1113 .sin_family = AF_INET, 1114 }; 1115 1116 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1117 sizeof(struct in_addr) > ipt->ipt_len) { 1118 code = (u_char *)&ipt->ipt_ptr - 1119 (u_char *)ip; 1120 goto bad; 1121 } 1122 memcpy(&ipaddr.sin_addr, cp0, 1123 sizeof(struct in_addr)); 1124 s = pserialize_read_enter(); 1125 ifa = ifa_ifwithaddr(sintosa(&ipaddr)); 1126 if (ifa == NULL) { 1127 pserialize_read_exit(s); 1128 continue; 1129 } 1130 pserialize_read_exit(s); 1131 ipt->ipt_ptr += sizeof(struct in_addr); 1132 break; 1133 } 1134 1135 default: 1136 /* XXX can't take &ipt->ipt_flg */ 1137 code = (u_char *)&ipt->ipt_ptr - 1138 (u_char *)ip + 1; 1139 goto bad; 1140 } 1141 ntime = iptime(); 1142 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1143 memmove((char *)cp + ipt->ipt_ptr - 1, cp0, 1144 sizeof(n_time)); 1145 ipt->ipt_ptr += sizeof(n_time); 1146 } 1147 } 1148 if (forward) { 1149 struct ifnet *rcvif; 1150 struct psref _psref; 1151 1152 if (ip_forwsrcrt == 0) { 1153 type = ICMP_UNREACH; 1154 code = ICMP_UNREACH_SRCFAIL; 1155 goto bad; 1156 } 1157 1158 rcvif = m_get_rcvif_psref(m, &_psref); 1159 if (__predict_false(rcvif == NULL)) { 1160 type = ICMP_UNREACH; 1161 code = ICMP_UNREACH_HOST; 1162 goto bad; 1163 } 1164 ip_forward(m, 1, rcvif); 1165 m_put_rcvif_psref(rcvif, &_psref); 1166 return true; 1167 } 1168 return false; 1169 bad: 1170 icmp_error(m, type, code, 0, 0); 1171 IP_STATINC(IP_STAT_BADOPTIONS); 1172 return true; 1173 } 1174 1175 /* 1176 * ip_rtaddr: given address of next destination (final or next hop), 1177 * return internet address info of interface to be used to get there. 1178 */ 1179 static struct in_ifaddr * 1180 ip_rtaddr(struct in_addr dst, struct psref *psref) 1181 { 1182 struct rtentry *rt; 1183 union { 1184 struct sockaddr dst; 1185 struct sockaddr_in dst4; 1186 } u; 1187 struct route *ro; 1188 1189 sockaddr_in_init(&u.dst4, &dst, 0); 1190 1191 ro = percpu_getref(ipforward_rt_percpu); 1192 rt = rtcache_lookup(ro, &u.dst); 1193 if (rt == NULL) { 1194 percpu_putref(ipforward_rt_percpu); 1195 return NULL; 1196 } 1197 1198 ia4_acquire(ifatoia(rt->rt_ifa), psref); 1199 rtcache_unref(rt, ro); 1200 percpu_putref(ipforward_rt_percpu); 1201 1202 return ifatoia(rt->rt_ifa); 1203 } 1204 1205 /* 1206 * save_rte: save incoming source route for use in replies, to be picked 1207 * up later by ip_srcroute if the receiver is interested. 1208 */ 1209 static void 1210 save_rte(struct mbuf *m, u_char *option, struct in_addr dst) 1211 { 1212 struct ip_srcrt *isr; 1213 struct m_tag *mtag; 1214 unsigned olen; 1215 1216 olen = option[IPOPT_OLEN]; 1217 if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes)) 1218 return; 1219 1220 mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT); 1221 if (mtag == NULL) 1222 return; 1223 isr = (struct ip_srcrt *)(mtag + 1); 1224 1225 memcpy(isr->isr_hdr, option, olen); 1226 isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1227 isr->isr_dst = dst; 1228 m_tag_prepend(m, mtag); 1229 } 1230 1231 /* 1232 * Retrieve incoming source route for use in replies, 1233 * in the same form used by setsockopt. 1234 * The first hop is placed before the options, will be removed later. 1235 */ 1236 struct mbuf * 1237 ip_srcroute(struct mbuf *m0) 1238 { 1239 struct in_addr *p, *q; 1240 struct mbuf *m; 1241 struct ip_srcrt *isr; 1242 struct m_tag *mtag; 1243 1244 mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE, NULL); 1245 if (mtag == NULL) 1246 return NULL; 1247 isr = (struct ip_srcrt *)(mtag + 1); 1248 1249 if (isr->isr_nhops == 0) 1250 return NULL; 1251 1252 m = m_get(M_DONTWAIT, MT_SOOPTS); 1253 if (m == NULL) 1254 return NULL; 1255 1256 MCLAIM(m, &inetdomain.dom_mowner); 1257 #define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr)) 1258 1259 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */ 1260 m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ; 1261 1262 /* 1263 * First save first hop for return route 1264 */ 1265 p = &(isr->isr_routes[isr->isr_nhops - 1]); 1266 *(mtod(m, struct in_addr *)) = *p--; 1267 1268 /* 1269 * Copy option fields and padding (nop) to mbuf. 1270 */ 1271 isr->isr_nop = IPOPT_NOP; 1272 isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF; 1273 memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop, 1274 OPTSIZ); 1275 q = (struct in_addr *)(mtod(m, char *) + 1276 sizeof(struct in_addr) + OPTSIZ); 1277 #undef OPTSIZ 1278 /* 1279 * Record return path as an IP source route, 1280 * reversing the path (pointers are now aligned). 1281 */ 1282 while (p >= isr->isr_routes) { 1283 *q++ = *p--; 1284 } 1285 /* 1286 * Last hop goes to final destination. 1287 */ 1288 *q = isr->isr_dst; 1289 m_tag_delete(m0, mtag); 1290 return m; 1291 } 1292 1293 const int inetctlerrmap[PRC_NCMDS] = { 1294 [PRC_MSGSIZE] = EMSGSIZE, 1295 [PRC_HOSTDEAD] = EHOSTDOWN, 1296 [PRC_HOSTUNREACH] = EHOSTUNREACH, 1297 [PRC_UNREACH_NET] = EHOSTUNREACH, 1298 [PRC_UNREACH_HOST] = EHOSTUNREACH, 1299 [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, 1300 [PRC_UNREACH_PORT] = ECONNREFUSED, 1301 [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, 1302 [PRC_PARAMPROB] = ENOPROTOOPT, 1303 }; 1304 1305 void 1306 ip_fasttimo(void) 1307 { 1308 if (ip_drainwanted) { 1309 ip_drain(); 1310 ip_drainwanted = 0; 1311 } 1312 } 1313 1314 void 1315 ip_drainstub(void) 1316 { 1317 ip_drainwanted = 1; 1318 } 1319 1320 /* 1321 * Forward a packet. If some error occurs return the sender 1322 * an icmp packet. Note we can't always generate a meaningful 1323 * icmp message because icmp doesn't have a large enough repertoire 1324 * of codes and types. 1325 * 1326 * If not forwarding, just drop the packet. This could be confusing 1327 * if ipforwarding was zero but some routing protocol was advancing 1328 * us as a gateway to somewhere. However, we must let the routing 1329 * protocol deal with that. 1330 * 1331 * The srcrt parameter indicates whether the packet is being forwarded 1332 * via a source route. 1333 */ 1334 static void 1335 ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif) 1336 { 1337 struct ip *ip = mtod(m, struct ip *); 1338 struct rtentry *rt; 1339 int error, type = 0, code = 0, destmtu = 0; 1340 struct mbuf *mcopy; 1341 n_long dest; 1342 union { 1343 struct sockaddr dst; 1344 struct sockaddr_in dst4; 1345 } u; 1346 uint64_t *ips; 1347 struct route *ro; 1348 1349 KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software " 1350 "interrupt handler; synchronization assumptions violated"); 1351 1352 /* 1353 * We are now in the output path. 1354 */ 1355 MCLAIM(m, &ip_tx_mowner); 1356 1357 /* 1358 * Clear any in-bound checksum flags for this packet. 1359 */ 1360 m->m_pkthdr.csum_flags = 0; 1361 1362 dest = 0; 1363 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1364 IP_STATINC(IP_STAT_CANTFORWARD); 1365 m_freem(m); 1366 return; 1367 } 1368 1369 if (ip->ip_ttl <= IPTTLDEC) { 1370 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1371 return; 1372 } 1373 1374 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1375 1376 ro = percpu_getref(ipforward_rt_percpu); 1377 rt = rtcache_lookup(ro, &u.dst); 1378 if (rt == NULL) { 1379 percpu_putref(ipforward_rt_percpu); 1380 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); 1381 return; 1382 } 1383 1384 /* 1385 * Save at most 68 bytes of the packet in case 1386 * we need to generate an ICMP message to the src. 1387 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1388 */ 1389 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1390 if (mcopy) 1391 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1392 1393 ip->ip_ttl -= IPTTLDEC; 1394 1395 /* 1396 * If forwarding packet using same interface that it came in on, 1397 * perhaps should send a redirect to sender to shortcut a hop. 1398 * Only send redirect if source is sending directly to us, 1399 * and if packet was not source routed (or has any options). 1400 * Also, don't send redirect if forwarding using a default route 1401 * or a route modified by a redirect. 1402 */ 1403 if (rt->rt_ifp == rcvif && 1404 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1405 !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && 1406 ipsendredirects && !srcrt) { 1407 if (rt->rt_ifa && 1408 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1409 ifatoia(rt->rt_ifa)->ia_subnet) { 1410 if (rt->rt_flags & RTF_GATEWAY) 1411 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1412 else 1413 dest = ip->ip_dst.s_addr; 1414 /* 1415 * Router requirements says to only send host 1416 * redirects. 1417 */ 1418 type = ICMP_REDIRECT; 1419 code = ICMP_REDIRECT_HOST; 1420 } 1421 } 1422 rtcache_unref(rt, ro); 1423 1424 error = ip_output(m, NULL, ro, 1425 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 1426 NULL, NULL); 1427 1428 if (error) { 1429 IP_STATINC(IP_STAT_CANTFORWARD); 1430 goto error; 1431 } 1432 1433 ips = IP_STAT_GETREF(); 1434 ips[IP_STAT_FORWARD]++; 1435 1436 if (type) { 1437 ips[IP_STAT_REDIRECTSENT]++; 1438 IP_STAT_PUTREF(); 1439 goto redirect; 1440 } 1441 1442 IP_STAT_PUTREF(); 1443 if (mcopy) { 1444 #ifdef GATEWAY 1445 if (mcopy->m_flags & M_CANFASTFWD) 1446 ipflow_create(ro, mcopy); 1447 #endif 1448 m_freem(mcopy); 1449 } 1450 1451 percpu_putref(ipforward_rt_percpu); 1452 return; 1453 1454 redirect: 1455 error: 1456 if (mcopy == NULL) { 1457 percpu_putref(ipforward_rt_percpu); 1458 return; 1459 } 1460 1461 switch (error) { 1462 1463 case 0: /* forwarded, but need redirect */ 1464 /* type, code set above */ 1465 break; 1466 1467 case ENETUNREACH: /* shouldn't happen, checked above */ 1468 case EHOSTUNREACH: 1469 case ENETDOWN: 1470 case EHOSTDOWN: 1471 default: 1472 type = ICMP_UNREACH; 1473 code = ICMP_UNREACH_HOST; 1474 break; 1475 1476 case EMSGSIZE: 1477 type = ICMP_UNREACH; 1478 code = ICMP_UNREACH_NEEDFRAG; 1479 1480 if ((rt = rtcache_validate(ro)) != NULL) { 1481 destmtu = rt->rt_ifp->if_mtu; 1482 rtcache_unref(rt, ro); 1483 } 1484 #ifdef IPSEC 1485 if (ipsec_used) 1486 (void)ipsec4_forward(mcopy, &destmtu); 1487 #endif 1488 IP_STATINC(IP_STAT_CANTFRAG); 1489 break; 1490 1491 case ENOBUFS: 1492 /* 1493 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812, 1494 * Requirements for IP Version 4 Routers. Source quench can 1495 * big problem under DoS attacks or if the underlying 1496 * interface is rate-limited. 1497 */ 1498 if (mcopy) 1499 m_freem(mcopy); 1500 percpu_putref(ipforward_rt_percpu); 1501 return; 1502 } 1503 icmp_error(mcopy, type, code, dest, destmtu); 1504 percpu_putref(ipforward_rt_percpu); 1505 } 1506 1507 void 1508 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1509 struct mbuf *m) 1510 { 1511 struct socket *so = inp->inp_socket; 1512 ifnet_t *ifp; 1513 int inpflags = inp->inp_flags; 1514 struct psref psref; 1515 1516 ifp = m_get_rcvif_psref(m, &psref); 1517 if (__predict_false(ifp == NULL)) 1518 return; /* XXX should report error? */ 1519 1520 if (so->so_options & SO_TIMESTAMP 1521 #ifdef SO_OTIMESTAMP 1522 || so->so_options & SO_OTIMESTAMP 1523 #endif 1524 ) { 1525 struct timeval tv; 1526 1527 microtime(&tv); 1528 #ifdef SO_OTIMESTAMP 1529 if (so->so_options & SO_OTIMESTAMP) { 1530 struct timeval50 tv50; 1531 timeval_to_timeval50(&tv, &tv50); 1532 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1533 SCM_OTIMESTAMP, SOL_SOCKET); 1534 } else 1535 #endif 1536 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1537 SCM_TIMESTAMP, SOL_SOCKET); 1538 if (*mp) 1539 mp = &(*mp)->m_next; 1540 } 1541 if (inpflags & INP_RECVDSTADDR) { 1542 *mp = sbcreatecontrol((void *) &ip->ip_dst, 1543 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1544 if (*mp) 1545 mp = &(*mp)->m_next; 1546 } 1547 if (inpflags & INP_RECVPKTINFO) { 1548 struct in_pktinfo ipi; 1549 ipi.ipi_addr = ip->ip_src; 1550 ipi.ipi_ifindex = ifp->if_index; 1551 *mp = sbcreatecontrol((void *) &ipi, 1552 sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP); 1553 if (*mp) 1554 mp = &(*mp)->m_next; 1555 } 1556 if (inpflags & INP_PKTINFO) { 1557 struct in_pktinfo ipi; 1558 ipi.ipi_addr = ip->ip_dst; 1559 ipi.ipi_ifindex = ifp->if_index; 1560 *mp = sbcreatecontrol((void *) &ipi, 1561 sizeof(ipi), IP_PKTINFO, IPPROTO_IP); 1562 if (*mp) 1563 mp = &(*mp)->m_next; 1564 } 1565 if (inpflags & INP_RECVIF) { 1566 struct sockaddr_dl sdl; 1567 1568 sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0, 1569 NULL, 0); 1570 *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); 1571 if (*mp) 1572 mp = &(*mp)->m_next; 1573 } 1574 if (inpflags & INP_RECVTTL) { 1575 *mp = sbcreatecontrol((void *) &ip->ip_ttl, 1576 sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); 1577 if (*mp) 1578 mp = &(*mp)->m_next; 1579 } 1580 m_put_rcvif_psref(ifp, &psref); 1581 } 1582 1583 /* 1584 * sysctl helper routine for net.inet.ip.forwsrcrt. 1585 */ 1586 static int 1587 sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) 1588 { 1589 int error, tmp; 1590 struct sysctlnode node; 1591 1592 node = *rnode; 1593 tmp = ip_forwsrcrt; 1594 node.sysctl_data = &tmp; 1595 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1596 if (error || newp == NULL) 1597 return (error); 1598 1599 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, 1600 0, NULL, NULL, NULL); 1601 if (error) 1602 return (error); 1603 1604 ip_forwsrcrt = tmp; 1605 1606 return (0); 1607 } 1608 1609 /* 1610 * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the 1611 * range of the new value and tweaks timers if it changes. 1612 */ 1613 static int 1614 sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) 1615 { 1616 int error, tmp; 1617 struct sysctlnode node; 1618 1619 icmp_mtudisc_lock(); 1620 1621 node = *rnode; 1622 tmp = ip_mtudisc_timeout; 1623 node.sysctl_data = &tmp; 1624 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1625 if (error || newp == NULL) 1626 goto out; 1627 if (tmp < 0) { 1628 error = EINVAL; 1629 goto out; 1630 } 1631 1632 ip_mtudisc_timeout = tmp; 1633 rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); 1634 error = 0; 1635 out: 1636 icmp_mtudisc_unlock(); 1637 return error; 1638 } 1639 1640 static int 1641 sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) 1642 { 1643 1644 return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); 1645 } 1646 1647 static void 1648 sysctl_net_inet_ip_setup(struct sysctllog **clog) 1649 { 1650 sysctl_createv(clog, 0, NULL, NULL, 1651 CTLFLAG_PERMANENT, 1652 CTLTYPE_NODE, "inet", 1653 SYSCTL_DESCR("PF_INET related settings"), 1654 NULL, 0, NULL, 0, 1655 CTL_NET, PF_INET, CTL_EOL); 1656 sysctl_createv(clog, 0, NULL, NULL, 1657 CTLFLAG_PERMANENT, 1658 CTLTYPE_NODE, "ip", 1659 SYSCTL_DESCR("IPv4 related settings"), 1660 NULL, 0, NULL, 0, 1661 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 1662 1663 sysctl_createv(clog, 0, NULL, NULL, 1664 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1665 CTLTYPE_INT, "forwarding", 1666 SYSCTL_DESCR("Enable forwarding of INET datagrams"), 1667 NULL, 0, &ipforwarding, 0, 1668 CTL_NET, PF_INET, IPPROTO_IP, 1669 IPCTL_FORWARDING, CTL_EOL); 1670 sysctl_createv(clog, 0, NULL, NULL, 1671 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1672 CTLTYPE_INT, "redirect", 1673 SYSCTL_DESCR("Enable sending of ICMP redirect messages"), 1674 NULL, 0, &ipsendredirects, 0, 1675 CTL_NET, PF_INET, IPPROTO_IP, 1676 IPCTL_SENDREDIRECTS, CTL_EOL); 1677 sysctl_createv(clog, 0, NULL, NULL, 1678 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1679 CTLTYPE_INT, "ttl", 1680 SYSCTL_DESCR("Default TTL for an INET datagram"), 1681 NULL, 0, &ip_defttl, 0, 1682 CTL_NET, PF_INET, IPPROTO_IP, 1683 IPCTL_DEFTTL, CTL_EOL); 1684 #ifdef IPCTL_DEFMTU 1685 sysctl_createv(clog, 0, NULL, NULL, 1686 CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */, 1687 CTLTYPE_INT, "mtu", 1688 SYSCTL_DESCR("Default MTA for an INET route"), 1689 NULL, 0, &ip_mtu, 0, 1690 CTL_NET, PF_INET, IPPROTO_IP, 1691 IPCTL_DEFMTU, CTL_EOL); 1692 #endif /* IPCTL_DEFMTU */ 1693 sysctl_createv(clog, 0, NULL, NULL, 1694 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1695 CTLTYPE_INT, "forwsrcrt", 1696 SYSCTL_DESCR("Enable forwarding of source-routed " 1697 "datagrams"), 1698 sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, 1699 CTL_NET, PF_INET, IPPROTO_IP, 1700 IPCTL_FORWSRCRT, CTL_EOL); 1701 sysctl_createv(clog, 0, NULL, NULL, 1702 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1703 CTLTYPE_INT, "directed-broadcast", 1704 SYSCTL_DESCR("Enable forwarding of broadcast datagrams"), 1705 NULL, 0, &ip_directedbcast, 0, 1706 CTL_NET, PF_INET, IPPROTO_IP, 1707 IPCTL_DIRECTEDBCAST, CTL_EOL); 1708 sysctl_createv(clog, 0, NULL, NULL, 1709 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1710 CTLTYPE_INT, "allowsrcrt", 1711 SYSCTL_DESCR("Accept source-routed datagrams"), 1712 NULL, 0, &ip_allowsrcrt, 0, 1713 CTL_NET, PF_INET, IPPROTO_IP, 1714 IPCTL_ALLOWSRCRT, CTL_EOL); 1715 1716 sysctl_createv(clog, 0, NULL, NULL, 1717 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1718 CTLTYPE_INT, "mtudisc", 1719 SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"), 1720 NULL, 0, &ip_mtudisc, 0, 1721 CTL_NET, PF_INET, IPPROTO_IP, 1722 IPCTL_MTUDISC, CTL_EOL); 1723 sysctl_createv(clog, 0, NULL, NULL, 1724 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1725 CTLTYPE_INT, "anonportmin", 1726 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1727 sysctl_net_inet_ip_ports, 0, &anonportmin, 0, 1728 CTL_NET, PF_INET, IPPROTO_IP, 1729 IPCTL_ANONPORTMIN, CTL_EOL); 1730 sysctl_createv(clog, 0, NULL, NULL, 1731 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1732 CTLTYPE_INT, "anonportmax", 1733 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1734 sysctl_net_inet_ip_ports, 0, &anonportmax, 0, 1735 CTL_NET, PF_INET, IPPROTO_IP, 1736 IPCTL_ANONPORTMAX, CTL_EOL); 1737 sysctl_createv(clog, 0, NULL, NULL, 1738 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1739 CTLTYPE_INT, "mtudisctimeout", 1740 SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"), 1741 sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0, 1742 CTL_NET, PF_INET, IPPROTO_IP, 1743 IPCTL_MTUDISCTIMEOUT, CTL_EOL); 1744 #ifndef IPNOPRIVPORTS 1745 sysctl_createv(clog, 0, NULL, NULL, 1746 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1747 CTLTYPE_INT, "lowportmin", 1748 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1749 "to assign"), 1750 sysctl_net_inet_ip_ports, 0, &lowportmin, 0, 1751 CTL_NET, PF_INET, IPPROTO_IP, 1752 IPCTL_LOWPORTMIN, CTL_EOL); 1753 sysctl_createv(clog, 0, NULL, NULL, 1754 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1755 CTLTYPE_INT, "lowportmax", 1756 SYSCTL_DESCR("Highest privileged ephemeral port number " 1757 "to assign"), 1758 sysctl_net_inet_ip_ports, 0, &lowportmax, 0, 1759 CTL_NET, PF_INET, IPPROTO_IP, 1760 IPCTL_LOWPORTMAX, CTL_EOL); 1761 #endif /* IPNOPRIVPORTS */ 1762 #if NGRE > 0 1763 sysctl_createv(clog, 0, NULL, NULL, 1764 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1765 CTLTYPE_INT, "grettl", 1766 SYSCTL_DESCR("Default TTL for a gre tunnel datagram"), 1767 NULL, 0, &ip_gre_ttl, 0, 1768 CTL_NET, PF_INET, IPPROTO_IP, 1769 IPCTL_GRE_TTL, CTL_EOL); 1770 #endif /* NGRE */ 1771 sysctl_createv(clog, 0, NULL, NULL, 1772 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1773 CTLTYPE_INT, "checkinterface", 1774 SYSCTL_DESCR("Enable receive side of Strong ES model " 1775 "from RFC1122"), 1776 NULL, 0, &ip_checkinterface, 0, 1777 CTL_NET, PF_INET, IPPROTO_IP, 1778 IPCTL_CHECKINTERFACE, CTL_EOL); 1779 sysctl_createv(clog, 0, NULL, NULL, 1780 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1781 CTLTYPE_INT, "random_id", 1782 SYSCTL_DESCR("Assign random ip_id values"), 1783 NULL, 0, &ip_do_randomid, 0, 1784 CTL_NET, PF_INET, IPPROTO_IP, 1785 IPCTL_RANDOMID, CTL_EOL); 1786 sysctl_createv(clog, 0, NULL, NULL, 1787 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1788 CTLTYPE_INT, "do_loopback_cksum", 1789 SYSCTL_DESCR("Perform IP checksum on loopback"), 1790 NULL, 0, &ip_do_loopback_cksum, 0, 1791 CTL_NET, PF_INET, IPPROTO_IP, 1792 IPCTL_LOOPBACKCKSUM, CTL_EOL); 1793 sysctl_createv(clog, 0, NULL, NULL, 1794 CTLFLAG_PERMANENT, 1795 CTLTYPE_STRUCT, "stats", 1796 SYSCTL_DESCR("IP statistics"), 1797 sysctl_net_inet_ip_stats, 0, NULL, 0, 1798 CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, 1799 CTL_EOL); 1800 #if NARP 1801 sysctl_createv(clog, 0, NULL, NULL, 1802 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1803 CTLTYPE_INT, "dad_count", 1804 SYSCTL_DESCR("Number of Duplicate Address Detection " 1805 "probes to send"), 1806 NULL, 0, &ip_dad_count, 0, 1807 CTL_NET, PF_INET, IPPROTO_IP, 1808 IPCTL_DAD_COUNT, CTL_EOL); 1809 #endif 1810 1811 /* anonportalgo RFC6056 subtree */ 1812 const struct sysctlnode *portalgo_node; 1813 sysctl_createv(clog, 0, NULL, &portalgo_node, 1814 CTLFLAG_PERMANENT, 1815 CTLTYPE_NODE, "anonportalgo", 1816 SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"), 1817 NULL, 0, NULL, 0, 1818 CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL); 1819 sysctl_createv(clog, 0, &portalgo_node, NULL, 1820 CTLFLAG_PERMANENT, 1821 CTLTYPE_STRING, "available", 1822 SYSCTL_DESCR("available algorithms"), 1823 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1824 CTL_CREATE, CTL_EOL); 1825 sysctl_createv(clog, 0, &portalgo_node, NULL, 1826 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1827 CTLTYPE_STRING, "selected", 1828 SYSCTL_DESCR("selected algorithm"), 1829 sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN, 1830 CTL_CREATE, CTL_EOL); 1831 sysctl_createv(clog, 0, &portalgo_node, NULL, 1832 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1833 CTLTYPE_STRUCT, "reserve", 1834 SYSCTL_DESCR("bitmap of reserved ports"), 1835 sysctl_portalgo_reserve4, 0, NULL, 0, 1836 CTL_CREATE, CTL_EOL); 1837 } 1838 1839 void 1840 ip_statinc(u_int stat) 1841 { 1842 1843 KASSERT(stat < IP_NSTATS); 1844 IP_STATINC(stat); 1845 } 1846
Indexes created Wed Oct 22 13:09:56 GMT 2025