1 /* $NetBSD: ip_input.c,v 1.308 2013/06/29 21:06:58 rmind 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 1.308 2013/06/29 21:06:58 rmind Exp $"); 95 96 #include "opt_inet.h" 97 #include "opt_compat_netbsd.h" 98 #include "opt_gateway.h" 99 #include "opt_ipsec.h" 100 #include "opt_mrouting.h" 101 #include "opt_mbuftrace.h" 102 #include "opt_inet_csum.h" 103 104 #include <sys/param.h> 105 #include <sys/systm.h> 106 #include <sys/mbuf.h> 107 #include <sys/domain.h> 108 #include <sys/protosw.h> 109 #include <sys/socket.h> 110 #include <sys/socketvar.h> 111 #include <sys/errno.h> 112 #include <sys/time.h> 113 #include <sys/kernel.h> 114 #include <sys/pool.h> 115 #include <sys/sysctl.h> 116 #include <sys/kauth.h> 117 118 #include <net/if.h> 119 #include <net/if_dl.h> 120 #include <net/route.h> 121 #include <net/pfil.h> 122 123 #include <netinet/in.h> 124 #include <netinet/in_systm.h> 125 #include <netinet/ip.h> 126 #include <netinet/in_pcb.h> 127 #include <netinet/in_proto.h> 128 #include <netinet/in_var.h> 129 #include <netinet/ip_var.h> 130 #include <netinet/ip_private.h> 131 #include <netinet/ip_icmp.h> 132 /* just for gif_ttl */ 133 #include <netinet/in_gif.h> 134 #include "gif.h" 135 #include <net/if_gre.h> 136 #include "gre.h" 137 138 #ifdef MROUTING 139 #include <netinet/ip_mroute.h> 140 #endif 141 #include <netinet/portalgo.h> 142 143 #ifdef IPSEC 144 #include <netipsec/ipsec.h> 145 #endif 146 147 #ifndef IPFORWARDING 148 #ifdef GATEWAY 149 #define IPFORWARDING 1 /* forward IP packets not for us */ 150 #else /* GATEWAY */ 151 #define IPFORWARDING 0 /* don't forward IP packets not for us */ 152 #endif /* GATEWAY */ 153 #endif /* IPFORWARDING */ 154 #ifndef IPSENDREDIRECTS 155 #define IPSENDREDIRECTS 1 156 #endif 157 #ifndef IPFORWSRCRT 158 #define IPFORWSRCRT 1 /* forward source-routed packets */ 159 #endif 160 #ifndef IPALLOWSRCRT 161 #define IPALLOWSRCRT 1 /* allow source-routed packets */ 162 #endif 163 #ifndef IPMTUDISC 164 #define IPMTUDISC 1 165 #endif 166 #ifndef IPMTUDISCTIMEOUT 167 #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 168 #endif 169 170 #ifdef COMPAT_50 171 #include <compat/sys/time.h> 172 #include <compat/sys/socket.h> 173 #endif 174 175 /* 176 * Note: DIRECTED_BROADCAST is handled this way so that previous 177 * configuration using this option will Just Work. 178 */ 179 #ifndef IPDIRECTEDBCAST 180 #ifdef DIRECTED_BROADCAST 181 #define IPDIRECTEDBCAST 1 182 #else 183 #define IPDIRECTEDBCAST 0 184 #endif /* DIRECTED_BROADCAST */ 185 #endif /* IPDIRECTEDBCAST */ 186 int ipforwarding = IPFORWARDING; 187 int ipsendredirects = IPSENDREDIRECTS; 188 int ip_defttl = IPDEFTTL; 189 int ip_forwsrcrt = IPFORWSRCRT; 190 int ip_directedbcast = IPDIRECTEDBCAST; 191 int ip_allowsrcrt = IPALLOWSRCRT; 192 int ip_mtudisc = IPMTUDISC; 193 int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; 194 #ifdef DIAGNOSTIC 195 int ipprintfs = 0; 196 #endif 197 198 int ip_do_randomid = 0; 199 200 /* 201 * XXX - Setting ip_checkinterface mostly implements the receive side of 202 * the Strong ES model described in RFC 1122, but since the routing table 203 * and transmit implementation do not implement the Strong ES model, 204 * setting this to 1 results in an odd hybrid. 205 * 206 * XXX - ip_checkinterface currently must be disabled if you use ipnat 207 * to translate the destination address to another local interface. 208 * 209 * XXX - ip_checkinterface must be disabled if you add IP aliases 210 * to the loopback interface instead of the interface where the 211 * packets for those addresses are received. 212 */ 213 int ip_checkinterface = 0; 214 215 216 struct rttimer_queue *ip_mtudisc_timeout_q = NULL; 217 218 u_long in_ifaddrhash; /* size of hash table - 1 */ 219 int in_ifaddrentries; /* total number of addrs */ 220 struct in_ifaddrhead in_ifaddrhead; 221 struct in_ifaddrhashhead *in_ifaddrhashtbl; 222 u_long in_multihash; /* size of hash table - 1 */ 223 int in_multientries; /* total number of addrs */ 224 struct in_multihashhead *in_multihashtbl; 225 struct ifqueue ipintrq; 226 227 ipid_state_t * ip_ids; 228 uint16_t ip_id; 229 230 percpu_t *ipstat_percpu; 231 232 pfil_head_t *inet_pfil_hook; 233 234 struct pool inmulti_pool; 235 236 #ifdef INET_CSUM_COUNTERS 237 #include <sys/device.h> 238 239 struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 240 NULL, "inet", "hwcsum bad"); 241 struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 242 NULL, "inet", "hwcsum ok"); 243 struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 244 NULL, "inet", "swcsum"); 245 246 #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ 247 248 EVCNT_ATTACH_STATIC(ip_hwcsum_bad); 249 EVCNT_ATTACH_STATIC(ip_hwcsum_ok); 250 EVCNT_ATTACH_STATIC(ip_swcsum); 251 252 #else 253 254 #define INET_CSUM_COUNTER_INCR(ev) /* nothing */ 255 256 #endif /* INET_CSUM_COUNTERS */ 257 258 /* 259 * We need to save the IP options in case a protocol wants to respond 260 * to an incoming packet over the same route if the packet got here 261 * using IP source routing. This allows connection establishment and 262 * maintenance when the remote end is on a network that is not known 263 * to us. 264 */ 265 int ip_nhops = 0; 266 static struct ip_srcrt { 267 struct in_addr dst; /* final destination */ 268 char nop; /* one NOP to align */ 269 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 270 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 271 } ip_srcrt; 272 273 static int ip_drainwanted; 274 275 static void save_rte(u_char *, struct in_addr); 276 277 #ifdef MBUFTRACE 278 struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx"); 279 struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx"); 280 #endif 281 282 static void sysctl_net_inet_ip_setup(struct sysctllog **); 283 284 /* 285 * IP initialization: fill in IP protocol switch table. 286 * All protocols not implemented in kernel go to raw IP protocol handler. 287 */ 288 void 289 ip_init(void) 290 { 291 const struct protosw *pr; 292 int i; 293 294 sysctl_net_inet_ip_setup(NULL); 295 296 pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", 297 NULL, IPL_SOFTNET); 298 299 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 300 if (pr == 0) 301 panic("ip_init"); 302 for (i = 0; i < IPPROTO_MAX; i++) 303 ip_protox[i] = pr - inetsw; 304 for (pr = inetdomain.dom_protosw; 305 pr < inetdomain.dom_protoswNPROTOSW; pr++) 306 if (pr->pr_domain->dom_family == PF_INET && 307 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 308 ip_protox[pr->pr_protocol] = pr - inetsw; 309 310 ip_reass_init(); 311 312 ip_ids = ip_id_init(); 313 ip_id = time_second & 0xfffff; 314 315 ipintrq.ifq_maxlen = IFQ_MAXLEN; 316 317 TAILQ_INIT(&in_ifaddrhead); 318 in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 319 &in_ifaddrhash); 320 in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true, 321 &in_multihash); 322 ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); 323 #ifdef GATEWAY 324 ipflow_init(ip_hashsize); 325 #endif 326 327 /* Register our Packet Filter hook. */ 328 inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET); 329 KASSERT(inet_pfil_hook != NULL); 330 331 #ifdef MBUFTRACE 332 MOWNER_ATTACH(&ip_tx_mowner); 333 MOWNER_ATTACH(&ip_rx_mowner); 334 #endif /* MBUFTRACE */ 335 336 ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS); 337 } 338 339 struct sockaddr_in ipaddr = { 340 .sin_len = sizeof(ipaddr), 341 .sin_family = AF_INET, 342 }; 343 struct route ipforward_rt; 344 345 /* 346 * IP software interrupt routine 347 */ 348 void 349 ipintr(void) 350 { 351 int s; 352 struct mbuf *m; 353 struct ifqueue lcl_intrq; 354 355 memset(&lcl_intrq, 0, sizeof(lcl_intrq)); 356 357 mutex_enter(softnet_lock); 358 KERNEL_LOCK(1, NULL); 359 if (!IF_IS_EMPTY(&ipintrq)) { 360 s = splnet(); 361 362 /* Take existing queue onto stack */ 363 lcl_intrq = ipintrq; 364 365 /* Zero out global queue, preserving maxlen and drops */ 366 ipintrq.ifq_head = NULL; 367 ipintrq.ifq_tail = NULL; 368 ipintrq.ifq_len = 0; 369 ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen; 370 ipintrq.ifq_drops = lcl_intrq.ifq_drops; 371 372 splx(s); 373 } 374 KERNEL_UNLOCK_ONE(NULL); 375 while (!IF_IS_EMPTY(&lcl_intrq)) { 376 IF_DEQUEUE(&lcl_intrq, m); 377 if (m == NULL) 378 break; 379 ip_input(m); 380 } 381 mutex_exit(softnet_lock); 382 } 383 384 /* 385 * Ip input routine. Checksum and byte swap header. If fragmented 386 * try to reassemble. Process options. Pass to next level. 387 */ 388 void 389 ip_input(struct mbuf *m) 390 { 391 struct ip *ip = NULL; 392 struct in_ifaddr *ia; 393 struct ifaddr *ifa; 394 int hlen = 0, len; 395 int downmatch; 396 int checkif; 397 int srcrt = 0; 398 399 MCLAIM(m, &ip_rx_mowner); 400 KASSERT((m->m_flags & M_PKTHDR) != 0); 401 402 /* 403 * If no IP addresses have been set yet but the interfaces 404 * are receiving, can't do anything with incoming packets yet. 405 */ 406 if (TAILQ_FIRST(&in_ifaddrhead) == 0) 407 goto bad; 408 IP_STATINC(IP_STAT_TOTAL); 409 /* 410 * If the IP header is not aligned, slurp it up into a new 411 * mbuf with space for link headers, in the event we forward 412 * it. Otherwise, if it is aligned, make sure the entire 413 * base IP header is in the first mbuf of the chain. 414 */ 415 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 416 if ((m = m_copyup(m, sizeof(struct ip), 417 (max_linkhdr + 3) & ~3)) == NULL) { 418 /* XXXJRT new stat, please */ 419 IP_STATINC(IP_STAT_TOOSMALL); 420 return; 421 } 422 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 423 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 424 IP_STATINC(IP_STAT_TOOSMALL); 425 return; 426 } 427 } 428 ip = mtod(m, struct ip *); 429 if (ip->ip_v != IPVERSION) { 430 IP_STATINC(IP_STAT_BADVERS); 431 goto bad; 432 } 433 hlen = ip->ip_hl << 2; 434 if (hlen < sizeof(struct ip)) { /* minimum header length */ 435 IP_STATINC(IP_STAT_BADHLEN); 436 goto bad; 437 } 438 if (hlen > m->m_len) { 439 if ((m = m_pullup(m, hlen)) == NULL) { 440 IP_STATINC(IP_STAT_BADHLEN); 441 return; 442 } 443 ip = mtod(m, struct ip *); 444 } 445 446 /* 447 * RFC1122: packets with a multicast source address are 448 * not allowed. 449 */ 450 if (IN_MULTICAST(ip->ip_src.s_addr)) { 451 IP_STATINC(IP_STAT_BADADDR); 452 goto bad; 453 } 454 455 /* 127/8 must not appear on wire - RFC1122 */ 456 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 457 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 458 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 459 IP_STATINC(IP_STAT_BADADDR); 460 goto bad; 461 } 462 } 463 464 switch (m->m_pkthdr.csum_flags & 465 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 466 M_CSUM_IPv4_BAD)) { 467 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 468 INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); 469 goto badcsum; 470 471 case M_CSUM_IPv4: 472 /* Checksum was okay. */ 473 INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); 474 break; 475 476 default: 477 /* 478 * Must compute it ourselves. Maybe skip checksum on 479 * loopback interfaces. 480 */ 481 if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & 482 IFF_LOOPBACK) || ip_do_loopback_cksum)) { 483 INET_CSUM_COUNTER_INCR(&ip_swcsum); 484 if (in_cksum(m, hlen) != 0) 485 goto badcsum; 486 } 487 break; 488 } 489 490 /* Retrieve the packet length. */ 491 len = ntohs(ip->ip_len); 492 493 /* 494 * Check for additional length bogosity 495 */ 496 if (len < hlen) { 497 IP_STATINC(IP_STAT_BADLEN); 498 goto bad; 499 } 500 501 /* 502 * Check that the amount of data in the buffers 503 * is as at least much as the IP header would have us expect. 504 * Trim mbufs if longer than we expect. 505 * Drop packet if shorter than we expect. 506 */ 507 if (m->m_pkthdr.len < len) { 508 IP_STATINC(IP_STAT_TOOSHORT); 509 goto bad; 510 } 511 if (m->m_pkthdr.len > len) { 512 if (m->m_len == m->m_pkthdr.len) { 513 m->m_len = len; 514 m->m_pkthdr.len = len; 515 } else 516 m_adj(m, len - m->m_pkthdr.len); 517 } 518 519 /* 520 * Assume that we can create a fast-forward IP flow entry 521 * based on this packet. 522 */ 523 m->m_flags |= M_CANFASTFWD; 524 525 /* 526 * Run through list of hooks for input packets. If there are any 527 * filters which require that additional packets in the flow are 528 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 529 * Note that filters must _never_ set this flag, as another filter 530 * in the list may have previously cleared it. 531 */ 532 /* 533 * let ipfilter look at packet on the wire, 534 * not the decapsulated packet. 535 */ 536 #if defined(IPSEC) 537 if (!ipsec_indone(m)) 538 #else 539 if (1) 540 #endif 541 { 542 struct in_addr odst; 543 544 odst = ip->ip_dst; 545 if (pfil_run_hooks(inet_pfil_hook, &m, m->m_pkthdr.rcvif, 546 PFIL_IN) != 0) 547 return; 548 if (m == NULL) 549 return; 550 ip = mtod(m, struct ip *); 551 hlen = ip->ip_hl << 2; 552 /* 553 * XXX The setting of "srcrt" here is to prevent ip_forward() 554 * from generating ICMP redirects for packets that have 555 * been redirected by a hook back out on to the same LAN that 556 * they came from and is not an indication that the packet 557 * is being inffluenced by source routing options. This 558 * allows things like 559 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" 560 * where tlp0 is both on the 1.1.1.0/24 network and is the 561 * default route for hosts on 1.1.1.0/24. Of course this 562 * also requires a "map tlp0 ..." to complete the story. 563 * One might argue whether or not this kind of network config. 564 * should be supported in this manner... 565 */ 566 srcrt = (odst.s_addr != ip->ip_dst.s_addr); 567 } 568 569 #ifdef ALTQ 570 /* XXX Temporary until ALTQ is changed to use a pfil hook */ 571 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) { 572 /* packet dropped by traffic conditioner */ 573 return; 574 } 575 #endif 576 577 /* 578 * Process options and, if not destined for us, 579 * ship it on. ip_dooptions returns 1 when an 580 * error was detected (causing an icmp message 581 * to be sent and the original packet to be freed). 582 */ 583 ip_nhops = 0; /* for source routed packets */ 584 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 585 return; 586 587 /* 588 * Enable a consistency check between the destination address 589 * and the arrival interface for a unicast packet (the RFC 1122 590 * strong ES model) if IP forwarding is disabled and the packet 591 * is not locally generated. 592 * 593 * XXX - Checking also should be disabled if the destination 594 * address is ipnat'ed to a different interface. 595 * 596 * XXX - Checking is incompatible with IP aliases added 597 * to the loopback interface instead of the interface where 598 * the packets are received. 599 * 600 * XXX - We need to add a per ifaddr flag for this so that 601 * we get finer grain control. 602 */ 603 checkif = ip_checkinterface && (ipforwarding == 0) && 604 (m->m_pkthdr.rcvif != NULL) && 605 ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0); 606 607 /* 608 * Check our list of addresses, to see if the packet is for us. 609 * 610 * Traditional 4.4BSD did not consult IFF_UP at all. 611 * The behavior here is to treat addresses on !IFF_UP interface 612 * as not mine. 613 */ 614 downmatch = 0; 615 LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 616 if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { 617 if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif) 618 continue; 619 if ((ia->ia_ifp->if_flags & IFF_UP) != 0) 620 break; 621 else 622 downmatch++; 623 } 624 } 625 if (ia != NULL) 626 goto ours; 627 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { 628 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 629 if (ifa->ifa_addr->sa_family != AF_INET) 630 continue; 631 ia = ifatoia(ifa); 632 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 633 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 634 /* 635 * Look for all-0's host part (old broadcast addr), 636 * either for subnet or net. 637 */ 638 ip->ip_dst.s_addr == ia->ia_subnet || 639 ip->ip_dst.s_addr == ia->ia_net) 640 goto ours; 641 /* 642 * An interface with IP address zero accepts 643 * all packets that arrive on that interface. 644 */ 645 if (in_nullhost(ia->ia_addr.sin_addr)) 646 goto ours; 647 } 648 } 649 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 650 struct in_multi *inm; 651 #ifdef MROUTING 652 extern struct socket *ip_mrouter; 653 654 if (ip_mrouter) { 655 /* 656 * If we are acting as a multicast router, all 657 * incoming multicast packets are passed to the 658 * kernel-level multicast forwarding function. 659 * The packet is returned (relatively) intact; if 660 * ip_mforward() returns a non-zero value, the packet 661 * must be discarded, else it may be accepted below. 662 * 663 * (The IP ident field is put in the same byte order 664 * as expected when ip_mforward() is called from 665 * ip_output().) 666 */ 667 if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { 668 IP_STATINC(IP_STAT_CANTFORWARD); 669 m_freem(m); 670 return; 671 } 672 673 /* 674 * The process-level routing demon needs to receive 675 * all multicast IGMP packets, whether or not this 676 * host belongs to their destination groups. 677 */ 678 if (ip->ip_p == IPPROTO_IGMP) 679 goto ours; 680 IP_STATINC(IP_STAT_CANTFORWARD); 681 } 682 #endif 683 /* 684 * See if we belong to the destination multicast group on the 685 * arrival interface. 686 */ 687 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 688 if (inm == NULL) { 689 IP_STATINC(IP_STAT_CANTFORWARD); 690 m_freem(m); 691 return; 692 } 693 goto ours; 694 } 695 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 696 in_nullhost(ip->ip_dst)) 697 goto ours; 698 699 /* 700 * Not for us; forward if possible and desirable. 701 */ 702 if (ipforwarding == 0) { 703 IP_STATINC(IP_STAT_CANTFORWARD); 704 m_freem(m); 705 } else { 706 /* 707 * If ip_dst matched any of my address on !IFF_UP interface, 708 * and there's no IFF_UP interface that matches ip_dst, 709 * send icmp unreach. Forwarding it will result in in-kernel 710 * forwarding loop till TTL goes to 0. 711 */ 712 if (downmatch) { 713 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); 714 IP_STATINC(IP_STAT_CANTFORWARD); 715 return; 716 } 717 #ifdef IPSEC 718 /* Perform IPsec, if any. */ 719 if (ipsec4_input(m, IP_FORWARDING | (ip_directedbcast ? 720 IP_ALLOWBROADCAST : 0)) != 0) { 721 goto bad; 722 } 723 #endif 724 ip_forward(m, srcrt); 725 } 726 return; 727 728 ours: 729 /* 730 * If offset or IP_MF are set, must reassemble. 731 */ 732 if (ip->ip_off & ~htons(IP_DF|IP_RF)) { 733 /* 734 * Pass to IP reassembly mechanism. 735 */ 736 if (ip_reass_packet(&m, ip) != 0) { 737 /* Failed; invalid fragment(s) or packet. */ 738 goto bad; 739 } 740 if (m == NULL) { 741 /* More fragments should come; silently return. */ 742 return; 743 } 744 /* 745 * Reassembly is done, we have the final packet. 746 * Updated cached data in local variable(s). 747 */ 748 ip = mtod(m, struct ip *); 749 hlen = ip->ip_hl << 2; 750 } 751 752 #ifdef IPSEC 753 /* 754 * Enforce IPsec policy checking if we are seeing last header. 755 * Note that we do not visit this with protocols with PCB layer 756 * code - like UDP/TCP/raw IP. 757 */ 758 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { 759 if (ipsec4_input(m, 0) != 0) { 760 goto bad; 761 } 762 } 763 #endif 764 765 /* 766 * Switch out to protocol's input routine. 767 */ 768 #if IFA_STATS 769 if (ia && ip) 770 ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); 771 #endif 772 IP_STATINC(IP_STAT_DELIVERED); 773 { 774 int off = hlen, nh = ip->ip_p; 775 776 (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); 777 return; 778 } 779 bad: 780 m_freem(m); 781 return; 782 783 badcsum: 784 IP_STATINC(IP_STAT_BADSUM); 785 m_freem(m); 786 } 787 788 /* 789 * IP timer processing. 790 */ 791 void 792 ip_slowtimo(void) 793 { 794 795 mutex_enter(softnet_lock); 796 KERNEL_LOCK(1, NULL); 797 798 ip_reass_slowtimo(); 799 800 KERNEL_UNLOCK_ONE(NULL); 801 mutex_exit(softnet_lock); 802 } 803 804 /* 805 * IP drain processing. 806 */ 807 void 808 ip_drain(void) 809 { 810 811 KERNEL_LOCK(1, NULL); 812 ip_reass_drain(); 813 KERNEL_UNLOCK_ONE(NULL); 814 } 815 816 /* 817 * Do option processing on a datagram, 818 * possibly discarding it if bad options are encountered, 819 * or forwarding it if source-routed. 820 * Returns 1 if packet has been forwarded/freed, 821 * 0 if the packet should be processed further. 822 */ 823 int 824 ip_dooptions(struct mbuf *m) 825 { 826 struct ip *ip = mtod(m, struct ip *); 827 u_char *cp, *cp0; 828 struct ip_timestamp *ipt; 829 struct in_ifaddr *ia; 830 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 831 struct in_addr dst; 832 n_time ntime; 833 834 dst = ip->ip_dst; 835 cp = (u_char *)(ip + 1); 836 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 837 for (; cnt > 0; cnt -= optlen, cp += optlen) { 838 opt = cp[IPOPT_OPTVAL]; 839 if (opt == IPOPT_EOL) 840 break; 841 if (opt == IPOPT_NOP) 842 optlen = 1; 843 else { 844 if (cnt < IPOPT_OLEN + sizeof(*cp)) { 845 code = &cp[IPOPT_OLEN] - (u_char *)ip; 846 goto bad; 847 } 848 optlen = cp[IPOPT_OLEN]; 849 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { 850 code = &cp[IPOPT_OLEN] - (u_char *)ip; 851 goto bad; 852 } 853 } 854 switch (opt) { 855 856 default: 857 break; 858 859 /* 860 * Source routing with record. 861 * Find interface with current destination address. 862 * If none on this machine then drop if strictly routed, 863 * or do nothing if loosely routed. 864 * Record interface address and bring up next address 865 * component. If strictly routed make sure next 866 * address is on directly accessible net. 867 */ 868 case IPOPT_LSRR: 869 case IPOPT_SSRR: 870 if (ip_allowsrcrt == 0) { 871 type = ICMP_UNREACH; 872 code = ICMP_UNREACH_NET_PROHIB; 873 goto bad; 874 } 875 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 876 code = &cp[IPOPT_OLEN] - (u_char *)ip; 877 goto bad; 878 } 879 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 880 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 881 goto bad; 882 } 883 ipaddr.sin_addr = ip->ip_dst; 884 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 885 if (ia == 0) { 886 if (opt == IPOPT_SSRR) { 887 type = ICMP_UNREACH; 888 code = ICMP_UNREACH_SRCFAIL; 889 goto bad; 890 } 891 /* 892 * Loose routing, and not at next destination 893 * yet; nothing to do except forward. 894 */ 895 break; 896 } 897 off--; /* 0 origin */ 898 if ((off + sizeof(struct in_addr)) > optlen) { 899 /* 900 * End of source route. Should be for us. 901 */ 902 save_rte(cp, ip->ip_src); 903 break; 904 } 905 /* 906 * locate outgoing interface 907 */ 908 memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), 909 sizeof(ipaddr.sin_addr)); 910 if (opt == IPOPT_SSRR) 911 ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr))); 912 else 913 ia = ip_rtaddr(ipaddr.sin_addr); 914 if (ia == 0) { 915 type = ICMP_UNREACH; 916 code = ICMP_UNREACH_SRCFAIL; 917 goto bad; 918 } 919 ip->ip_dst = ipaddr.sin_addr; 920 bcopy((void *)&ia->ia_addr.sin_addr, 921 (void *)(cp + off), sizeof(struct in_addr)); 922 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 923 /* 924 * Let ip_intr's mcast routing check handle mcast pkts 925 */ 926 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 927 break; 928 929 case IPOPT_RR: 930 if (optlen < IPOPT_OFFSET + sizeof(*cp)) { 931 code = &cp[IPOPT_OLEN] - (u_char *)ip; 932 goto bad; 933 } 934 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 935 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 936 goto bad; 937 } 938 /* 939 * If no space remains, ignore. 940 */ 941 off--; /* 0 origin */ 942 if ((off + sizeof(struct in_addr)) > optlen) 943 break; 944 memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst), 945 sizeof(ipaddr.sin_addr)); 946 /* 947 * locate outgoing interface; if we're the destination, 948 * use the incoming interface (should be same). 949 */ 950 if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))) 951 == NULL && 952 (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) { 953 type = ICMP_UNREACH; 954 code = ICMP_UNREACH_HOST; 955 goto bad; 956 } 957 bcopy((void *)&ia->ia_addr.sin_addr, 958 (void *)(cp + off), sizeof(struct in_addr)); 959 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 960 break; 961 962 case IPOPT_TS: 963 code = cp - (u_char *)ip; 964 ipt = (struct ip_timestamp *)cp; 965 if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { 966 code = (u_char *)&ipt->ipt_len - (u_char *)ip; 967 goto bad; 968 } 969 if (ipt->ipt_ptr < 5) { 970 code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; 971 goto bad; 972 } 973 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 974 if (++ipt->ipt_oflw == 0) { 975 code = (u_char *)&ipt->ipt_ptr - 976 (u_char *)ip; 977 goto bad; 978 } 979 break; 980 } 981 cp0 = (cp + ipt->ipt_ptr - 1); 982 switch (ipt->ipt_flg) { 983 984 case IPOPT_TS_TSONLY: 985 break; 986 987 case IPOPT_TS_TSANDADDR: 988 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 989 sizeof(struct in_addr) > ipt->ipt_len) { 990 code = (u_char *)&ipt->ipt_ptr - 991 (u_char *)ip; 992 goto bad; 993 } 994 ipaddr.sin_addr = dst; 995 ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr), 996 m->m_pkthdr.rcvif)); 997 if (ia == 0) 998 continue; 999 bcopy(&ia->ia_addr.sin_addr, 1000 cp0, sizeof(struct in_addr)); 1001 ipt->ipt_ptr += sizeof(struct in_addr); 1002 break; 1003 1004 case IPOPT_TS_PRESPEC: 1005 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 1006 sizeof(struct in_addr) > ipt->ipt_len) { 1007 code = (u_char *)&ipt->ipt_ptr - 1008 (u_char *)ip; 1009 goto bad; 1010 } 1011 memcpy(&ipaddr.sin_addr, cp0, 1012 sizeof(struct in_addr)); 1013 if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))) 1014 == NULL) 1015 continue; 1016 ipt->ipt_ptr += sizeof(struct in_addr); 1017 break; 1018 1019 default: 1020 /* XXX can't take &ipt->ipt_flg */ 1021 code = (u_char *)&ipt->ipt_ptr - 1022 (u_char *)ip + 1; 1023 goto bad; 1024 } 1025 ntime = iptime(); 1026 cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ 1027 memmove((char *)cp + ipt->ipt_ptr - 1, cp0, 1028 sizeof(n_time)); 1029 ipt->ipt_ptr += sizeof(n_time); 1030 } 1031 } 1032 if (forward) { 1033 if (ip_forwsrcrt == 0) { 1034 type = ICMP_UNREACH; 1035 code = ICMP_UNREACH_SRCFAIL; 1036 goto bad; 1037 } 1038 ip_forward(m, 1); 1039 return (1); 1040 } 1041 return (0); 1042 bad: 1043 icmp_error(m, type, code, 0, 0); 1044 IP_STATINC(IP_STAT_BADOPTIONS); 1045 return (1); 1046 } 1047 1048 /* 1049 * Given address of next destination (final or next hop), 1050 * return internet address info of interface to be used to get there. 1051 */ 1052 struct in_ifaddr * 1053 ip_rtaddr(struct in_addr dst) 1054 { 1055 struct rtentry *rt; 1056 union { 1057 struct sockaddr dst; 1058 struct sockaddr_in dst4; 1059 } u; 1060 1061 sockaddr_in_init(&u.dst4, &dst, 0); 1062 1063 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) 1064 return NULL; 1065 1066 return ifatoia(rt->rt_ifa); 1067 } 1068 1069 /* 1070 * Save incoming source route for use in replies, 1071 * to be picked up later by ip_srcroute if the receiver is interested. 1072 */ 1073 void 1074 save_rte(u_char *option, struct in_addr dst) 1075 { 1076 unsigned olen; 1077 1078 olen = option[IPOPT_OLEN]; 1079 #ifdef DIAGNOSTIC 1080 if (ipprintfs) 1081 printf("save_rte: olen %d\n", olen); 1082 #endif /* 0 */ 1083 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1084 return; 1085 memcpy((void *)ip_srcrt.srcopt, (void *)option, olen); 1086 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1087 ip_srcrt.dst = dst; 1088 } 1089 1090 /* 1091 * Retrieve incoming source route for use in replies, 1092 * in the same form used by setsockopt. 1093 * The first hop is placed before the options, will be removed later. 1094 */ 1095 struct mbuf * 1096 ip_srcroute(void) 1097 { 1098 struct in_addr *p, *q; 1099 struct mbuf *m; 1100 1101 if (ip_nhops == 0) 1102 return NULL; 1103 m = m_get(M_DONTWAIT, MT_SOOPTS); 1104 if (m == 0) 1105 return NULL; 1106 1107 MCLAIM(m, &inetdomain.dom_mowner); 1108 #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1109 1110 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1111 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1112 OPTSIZ; 1113 #ifdef DIAGNOSTIC 1114 if (ipprintfs) 1115 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1116 #endif 1117 1118 /* 1119 * First save first hop for return route 1120 */ 1121 p = &ip_srcrt.route[ip_nhops - 1]; 1122 *(mtod(m, struct in_addr *)) = *p--; 1123 #ifdef DIAGNOSTIC 1124 if (ipprintfs) 1125 printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr)); 1126 #endif 1127 1128 /* 1129 * Copy option fields and padding (nop) to mbuf. 1130 */ 1131 ip_srcrt.nop = IPOPT_NOP; 1132 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1133 memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop, 1134 OPTSIZ); 1135 q = (struct in_addr *)(mtod(m, char *) + 1136 sizeof(struct in_addr) + OPTSIZ); 1137 #undef OPTSIZ 1138 /* 1139 * Record return path as an IP source route, 1140 * reversing the path (pointers are now aligned). 1141 */ 1142 while (p >= ip_srcrt.route) { 1143 #ifdef DIAGNOSTIC 1144 if (ipprintfs) 1145 printf(" %x", ntohl(q->s_addr)); 1146 #endif 1147 *q++ = *p--; 1148 } 1149 /* 1150 * Last hop goes to final destination. 1151 */ 1152 *q = ip_srcrt.dst; 1153 #ifdef DIAGNOSTIC 1154 if (ipprintfs) 1155 printf(" %x\n", ntohl(q->s_addr)); 1156 #endif 1157 return (m); 1158 } 1159 1160 const int inetctlerrmap[PRC_NCMDS] = { 1161 [PRC_MSGSIZE] = EMSGSIZE, 1162 [PRC_HOSTDEAD] = EHOSTDOWN, 1163 [PRC_HOSTUNREACH] = EHOSTUNREACH, 1164 [PRC_UNREACH_NET] = EHOSTUNREACH, 1165 [PRC_UNREACH_HOST] = EHOSTUNREACH, 1166 [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, 1167 [PRC_UNREACH_PORT] = ECONNREFUSED, 1168 [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, 1169 [PRC_PARAMPROB] = ENOPROTOOPT, 1170 }; 1171 1172 void 1173 ip_fasttimo(void) 1174 { 1175 if (ip_drainwanted) { 1176 ip_drain(); 1177 ip_drainwanted = 0; 1178 } 1179 } 1180 1181 void 1182 ip_drainstub(void) 1183 { 1184 ip_drainwanted = 1; 1185 } 1186 1187 /* 1188 * Forward a packet. If some error occurs return the sender 1189 * an icmp packet. Note we can't always generate a meaningful 1190 * icmp message because icmp doesn't have a large enough repertoire 1191 * of codes and types. 1192 * 1193 * If not forwarding, just drop the packet. This could be confusing 1194 * if ipforwarding was zero but some routing protocol was advancing 1195 * us as a gateway to somewhere. However, we must let the routing 1196 * protocol deal with that. 1197 * 1198 * The srcrt parameter indicates whether the packet is being forwarded 1199 * via a source route. 1200 */ 1201 void 1202 ip_forward(struct mbuf *m, int srcrt) 1203 { 1204 struct ip *ip = mtod(m, struct ip *); 1205 struct rtentry *rt; 1206 int error, type = 0, code = 0, destmtu = 0; 1207 struct mbuf *mcopy; 1208 n_long dest; 1209 union { 1210 struct sockaddr dst; 1211 struct sockaddr_in dst4; 1212 } u; 1213 1214 /* 1215 * We are now in the output path. 1216 */ 1217 MCLAIM(m, &ip_tx_mowner); 1218 1219 /* 1220 * Clear any in-bound checksum flags for this packet. 1221 */ 1222 m->m_pkthdr.csum_flags = 0; 1223 1224 dest = 0; 1225 #ifdef DIAGNOSTIC 1226 if (ipprintfs) { 1227 printf("forward: src %s ", inet_ntoa(ip->ip_src)); 1228 printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl); 1229 } 1230 #endif 1231 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 1232 IP_STATINC(IP_STAT_CANTFORWARD); 1233 m_freem(m); 1234 return; 1235 } 1236 if (ip->ip_ttl <= IPTTLDEC) { 1237 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1238 return; 1239 } 1240 1241 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); 1242 if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) { 1243 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); 1244 return; 1245 } 1246 1247 /* 1248 * Save at most 68 bytes of the packet in case 1249 * we need to generate an ICMP message to the src. 1250 * Pullup to avoid sharing mbuf cluster between m and mcopy. 1251 */ 1252 mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); 1253 if (mcopy) 1254 mcopy = m_pullup(mcopy, ip->ip_hl << 2); 1255 1256 ip->ip_ttl -= IPTTLDEC; 1257 1258 /* 1259 * If forwarding packet using same interface that it came in on, 1260 * perhaps should send a redirect to sender to shortcut a hop. 1261 * Only send redirect if source is sending directly to us, 1262 * and if packet was not source routed (or has any options). 1263 * Also, don't send redirect if forwarding using a default route 1264 * or a route modified by a redirect. 1265 */ 1266 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1267 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1268 !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && 1269 ipsendredirects && !srcrt) { 1270 if (rt->rt_ifa && 1271 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1272 ifatoia(rt->rt_ifa)->ia_subnet) { 1273 if (rt->rt_flags & RTF_GATEWAY) 1274 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1275 else 1276 dest = ip->ip_dst.s_addr; 1277 /* 1278 * Router requirements says to only send host 1279 * redirects. 1280 */ 1281 type = ICMP_REDIRECT; 1282 code = ICMP_REDIRECT_HOST; 1283 #ifdef DIAGNOSTIC 1284 if (ipprintfs) 1285 printf("redirect (%d) to %x\n", code, 1286 (u_int32_t)dest); 1287 #endif 1288 } 1289 } 1290 1291 error = ip_output(m, NULL, &ipforward_rt, 1292 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 1293 NULL, NULL); 1294 1295 if (error) 1296 IP_STATINC(IP_STAT_CANTFORWARD); 1297 else { 1298 uint64_t *ips = IP_STAT_GETREF(); 1299 ips[IP_STAT_FORWARD]++; 1300 if (type) { 1301 ips[IP_STAT_REDIRECTSENT]++; 1302 IP_STAT_PUTREF(); 1303 } else { 1304 IP_STAT_PUTREF(); 1305 if (mcopy) { 1306 #ifdef GATEWAY 1307 if (mcopy->m_flags & M_CANFASTFWD) 1308 ipflow_create(&ipforward_rt, mcopy); 1309 #endif 1310 m_freem(mcopy); 1311 } 1312 return; 1313 } 1314 } 1315 if (mcopy == NULL) 1316 return; 1317 1318 switch (error) { 1319 1320 case 0: /* forwarded, but need redirect */ 1321 /* type, code set above */ 1322 break; 1323 1324 case ENETUNREACH: /* shouldn't happen, checked above */ 1325 case EHOSTUNREACH: 1326 case ENETDOWN: 1327 case EHOSTDOWN: 1328 default: 1329 type = ICMP_UNREACH; 1330 code = ICMP_UNREACH_HOST; 1331 break; 1332 1333 case EMSGSIZE: 1334 type = ICMP_UNREACH; 1335 code = ICMP_UNREACH_NEEDFRAG; 1336 1337 if ((rt = rtcache_validate(&ipforward_rt)) != NULL) 1338 destmtu = rt->rt_ifp->if_mtu; 1339 #ifdef IPSEC 1340 (void)ipsec4_forward(mcopy, &destmtu); 1341 #endif 1342 IP_STATINC(IP_STAT_CANTFRAG); 1343 break; 1344 1345 case ENOBUFS: 1346 #if 1 1347 /* 1348 * a router should not generate ICMP_SOURCEQUENCH as 1349 * required in RFC1812 Requirements for IP Version 4 Routers. 1350 * source quench could be a big problem under DoS attacks, 1351 * or if the underlying interface is rate-limited. 1352 */ 1353 if (mcopy) 1354 m_freem(mcopy); 1355 return; 1356 #else 1357 type = ICMP_SOURCEQUENCH; 1358 code = 0; 1359 break; 1360 #endif 1361 } 1362 icmp_error(mcopy, type, code, dest, destmtu); 1363 } 1364 1365 void 1366 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1367 struct mbuf *m) 1368 { 1369 1370 if (inp->inp_socket->so_options & SO_TIMESTAMP 1371 #ifdef SO_OTIMESTAMP 1372 || inp->inp_socket->so_options & SO_OTIMESTAMP 1373 #endif 1374 ) { 1375 struct timeval tv; 1376 1377 microtime(&tv); 1378 #ifdef SO_OTIMESTAMP 1379 if (inp->inp_socket->so_options & SO_OTIMESTAMP) { 1380 struct timeval50 tv50; 1381 timeval_to_timeval50(&tv, &tv50); 1382 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1383 SCM_OTIMESTAMP, SOL_SOCKET); 1384 } else 1385 #endif 1386 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1387 SCM_TIMESTAMP, SOL_SOCKET); 1388 if (*mp) 1389 mp = &(*mp)->m_next; 1390 } 1391 if (inp->inp_flags & INP_RECVDSTADDR) { 1392 *mp = sbcreatecontrol((void *) &ip->ip_dst, 1393 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1394 if (*mp) 1395 mp = &(*mp)->m_next; 1396 } 1397 if (inp->inp_flags & INP_RECVPKTINFO) { 1398 struct in_pktinfo ipi; 1399 ipi.ipi_addr = ip->ip_src; 1400 ipi.ipi_ifindex = m->m_pkthdr.rcvif->if_index; 1401 *mp = sbcreatecontrol((void *) &ipi, 1402 sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP); 1403 if (*mp) 1404 mp = &(*mp)->m_next; 1405 } 1406 if (inp->inp_flags & INP_PKTINFO) { 1407 struct in_pktinfo ipi; 1408 ipi.ipi_addr = ip->ip_dst; 1409 ipi.ipi_ifindex = m->m_pkthdr.rcvif->if_index; 1410 *mp = sbcreatecontrol((void *) &ipi, 1411 sizeof(ipi), IP_PKTINFO, IPPROTO_IP); 1412 if (*mp) 1413 mp = &(*mp)->m_next; 1414 } 1415 #ifdef notyet 1416 /* 1417 * XXX 1418 * Moving these out of udp_input() made them even more broken 1419 * than they already were. 1420 * - fenner@parc.xerox.com 1421 */ 1422 /* options were tossed already */ 1423 if (inp->inp_flags & INP_RECVOPTS) { 1424 *mp = sbcreatecontrol((void *) opts_deleted_above, 1425 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1426 if (*mp) 1427 mp = &(*mp)->m_next; 1428 } 1429 /* ip_srcroute doesn't do what we want here, need to fix */ 1430 if (inp->inp_flags & INP_RECVRETOPTS) { 1431 *mp = sbcreatecontrol((void *) ip_srcroute(), 1432 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1433 if (*mp) 1434 mp = &(*mp)->m_next; 1435 } 1436 #endif 1437 if (inp->inp_flags & INP_RECVIF) { 1438 struct sockaddr_dl sdl; 1439 1440 sockaddr_dl_init(&sdl, sizeof(sdl), 1441 (m->m_pkthdr.rcvif != NULL) 1442 ? m->m_pkthdr.rcvif->if_index 1443 : 0, 1444 0, NULL, 0, NULL, 0); 1445 *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); 1446 if (*mp) 1447 mp = &(*mp)->m_next; 1448 } 1449 if (inp->inp_flags & INP_RECVTTL) { 1450 *mp = sbcreatecontrol((void *) &ip->ip_ttl, 1451 sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); 1452 if (*mp) 1453 mp = &(*mp)->m_next; 1454 } 1455 } 1456 1457 /* 1458 * sysctl helper routine for net.inet.ip.forwsrcrt. 1459 */ 1460 static int 1461 sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) 1462 { 1463 int error, tmp; 1464 struct sysctlnode node; 1465 1466 node = *rnode; 1467 tmp = ip_forwsrcrt; 1468 node.sysctl_data = &tmp; 1469 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1470 if (error || newp == NULL) 1471 return (error); 1472 1473 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, 1474 0, NULL, NULL, NULL); 1475 if (error) 1476 return (error); 1477 1478 ip_forwsrcrt = tmp; 1479 1480 return (0); 1481 } 1482 1483 /* 1484 * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the 1485 * range of the new value and tweaks timers if it changes. 1486 */ 1487 static int 1488 sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) 1489 { 1490 int error, tmp; 1491 struct sysctlnode node; 1492 1493 node = *rnode; 1494 tmp = ip_mtudisc_timeout; 1495 node.sysctl_data = &tmp; 1496 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1497 if (error || newp == NULL) 1498 return (error); 1499 if (tmp < 0) 1500 return (EINVAL); 1501 1502 mutex_enter(softnet_lock); 1503 1504 ip_mtudisc_timeout = tmp; 1505 rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); 1506 1507 mutex_exit(softnet_lock); 1508 1509 return (0); 1510 } 1511 1512 #ifdef GATEWAY 1513 /* 1514 * sysctl helper routine for net.inet.ip.maxflows. 1515 */ 1516 static int 1517 sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS) 1518 { 1519 int error; 1520 1521 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1522 if (error || newp == NULL) 1523 return (error); 1524 1525 mutex_enter(softnet_lock); 1526 KERNEL_LOCK(1, NULL); 1527 1528 ipflow_prune(); 1529 1530 KERNEL_UNLOCK_ONE(NULL); 1531 mutex_exit(softnet_lock); 1532 1533 return (0); 1534 } 1535 1536 static int 1537 sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS) 1538 { 1539 int error, tmp; 1540 struct sysctlnode node; 1541 1542 node = *rnode; 1543 tmp = ip_hashsize; 1544 node.sysctl_data = &tmp; 1545 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1546 if (error || newp == NULL) 1547 return (error); 1548 1549 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1550 /* 1551 * Can only fail due to malloc() 1552 */ 1553 mutex_enter(softnet_lock); 1554 KERNEL_LOCK(1, NULL); 1555 1556 error = ipflow_invalidate_all(tmp); 1557 1558 KERNEL_UNLOCK_ONE(NULL); 1559 mutex_exit(softnet_lock); 1560 1561 } else { 1562 /* 1563 * EINVAL if not a power of 2 1564 */ 1565 error = EINVAL; 1566 } 1567 1568 return error; 1569 } 1570 #endif /* GATEWAY */ 1571 1572 static int 1573 sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) 1574 { 1575 1576 return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); 1577 } 1578 1579 static void 1580 sysctl_net_inet_ip_setup(struct sysctllog **clog) 1581 { 1582 extern int subnetsarelocal, hostzeroisbroadcast; 1583 1584 sysctl_createv(clog, 0, NULL, NULL, 1585 CTLFLAG_PERMANENT, 1586 CTLTYPE_NODE, "net", NULL, 1587 NULL, 0, NULL, 0, 1588 CTL_NET, CTL_EOL); 1589 sysctl_createv(clog, 0, NULL, NULL, 1590 CTLFLAG_PERMANENT, 1591 CTLTYPE_NODE, "inet", 1592 SYSCTL_DESCR("PF_INET related settings"), 1593 NULL, 0, NULL, 0, 1594 CTL_NET, PF_INET, CTL_EOL); 1595 sysctl_createv(clog, 0, NULL, NULL, 1596 CTLFLAG_PERMANENT, 1597 CTLTYPE_NODE, "ip", 1598 SYSCTL_DESCR("IPv4 related settings"), 1599 NULL, 0, NULL, 0, 1600 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 1601 1602 sysctl_createv(clog, 0, NULL, NULL, 1603 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1604 CTLTYPE_INT, "forwarding", 1605 SYSCTL_DESCR("Enable forwarding of INET datagrams"), 1606 NULL, 0, &ipforwarding, 0, 1607 CTL_NET, PF_INET, IPPROTO_IP, 1608 IPCTL_FORWARDING, CTL_EOL); 1609 sysctl_createv(clog, 0, NULL, NULL, 1610 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1611 CTLTYPE_INT, "redirect", 1612 SYSCTL_DESCR("Enable sending of ICMP redirect messages"), 1613 NULL, 0, &ipsendredirects, 0, 1614 CTL_NET, PF_INET, IPPROTO_IP, 1615 IPCTL_SENDREDIRECTS, CTL_EOL); 1616 sysctl_createv(clog, 0, NULL, NULL, 1617 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1618 CTLTYPE_INT, "ttl", 1619 SYSCTL_DESCR("Default TTL for an INET datagram"), 1620 NULL, 0, &ip_defttl, 0, 1621 CTL_NET, PF_INET, IPPROTO_IP, 1622 IPCTL_DEFTTL, CTL_EOL); 1623 #ifdef IPCTL_DEFMTU 1624 sysctl_createv(clog, 0, NULL, NULL, 1625 CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */, 1626 CTLTYPE_INT, "mtu", 1627 SYSCTL_DESCR("Default MTA for an INET route"), 1628 NULL, 0, &ip_mtu, 0, 1629 CTL_NET, PF_INET, IPPROTO_IP, 1630 IPCTL_DEFMTU, CTL_EOL); 1631 #endif /* IPCTL_DEFMTU */ 1632 sysctl_createv(clog, 0, NULL, NULL, 1633 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1634 CTLTYPE_INT, "forwsrcrt", 1635 SYSCTL_DESCR("Enable forwarding of source-routed " 1636 "datagrams"), 1637 sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, 1638 CTL_NET, PF_INET, IPPROTO_IP, 1639 IPCTL_FORWSRCRT, CTL_EOL); 1640 sysctl_createv(clog, 0, NULL, NULL, 1641 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1642 CTLTYPE_INT, "directed-broadcast", 1643 SYSCTL_DESCR("Enable forwarding of broadcast datagrams"), 1644 NULL, 0, &ip_directedbcast, 0, 1645 CTL_NET, PF_INET, IPPROTO_IP, 1646 IPCTL_DIRECTEDBCAST, CTL_EOL); 1647 sysctl_createv(clog, 0, NULL, NULL, 1648 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1649 CTLTYPE_INT, "allowsrcrt", 1650 SYSCTL_DESCR("Accept source-routed datagrams"), 1651 NULL, 0, &ip_allowsrcrt, 0, 1652 CTL_NET, PF_INET, IPPROTO_IP, 1653 IPCTL_ALLOWSRCRT, CTL_EOL); 1654 sysctl_createv(clog, 0, NULL, NULL, 1655 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1656 CTLTYPE_INT, "subnetsarelocal", 1657 SYSCTL_DESCR("Whether logical subnets are considered " 1658 "local"), 1659 NULL, 0, &subnetsarelocal, 0, 1660 CTL_NET, PF_INET, IPPROTO_IP, 1661 IPCTL_SUBNETSARELOCAL, CTL_EOL); 1662 sysctl_createv(clog, 0, NULL, NULL, 1663 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1664 CTLTYPE_INT, "mtudisc", 1665 SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"), 1666 NULL, 0, &ip_mtudisc, 0, 1667 CTL_NET, PF_INET, IPPROTO_IP, 1668 IPCTL_MTUDISC, CTL_EOL); 1669 sysctl_createv(clog, 0, NULL, NULL, 1670 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1671 CTLTYPE_INT, "anonportmin", 1672 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1673 sysctl_net_inet_ip_ports, 0, &anonportmin, 0, 1674 CTL_NET, PF_INET, IPPROTO_IP, 1675 IPCTL_ANONPORTMIN, CTL_EOL); 1676 sysctl_createv(clog, 0, NULL, NULL, 1677 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1678 CTLTYPE_INT, "anonportmax", 1679 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1680 sysctl_net_inet_ip_ports, 0, &anonportmax, 0, 1681 CTL_NET, PF_INET, IPPROTO_IP, 1682 IPCTL_ANONPORTMAX, CTL_EOL); 1683 sysctl_createv(clog, 0, NULL, NULL, 1684 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1685 CTLTYPE_INT, "mtudisctimeout", 1686 SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"), 1687 sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0, 1688 CTL_NET, PF_INET, IPPROTO_IP, 1689 IPCTL_MTUDISCTIMEOUT, CTL_EOL); 1690 #ifdef GATEWAY 1691 sysctl_createv(clog, 0, NULL, NULL, 1692 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1693 CTLTYPE_INT, "maxflows", 1694 SYSCTL_DESCR("Number of flows for fast forwarding"), 1695 sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0, 1696 CTL_NET, PF_INET, IPPROTO_IP, 1697 IPCTL_MAXFLOWS, CTL_EOL); 1698 sysctl_createv(clog, 0, NULL, NULL, 1699 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1700 CTLTYPE_INT, "hashsize", 1701 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"), 1702 sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0, 1703 CTL_NET, PF_INET, IPPROTO_IP, 1704 CTL_CREATE, CTL_EOL); 1705 #endif /* GATEWAY */ 1706 sysctl_createv(clog, 0, NULL, NULL, 1707 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1708 CTLTYPE_INT, "hostzerobroadcast", 1709 SYSCTL_DESCR("All zeroes address is broadcast address"), 1710 NULL, 0, &hostzeroisbroadcast, 0, 1711 CTL_NET, PF_INET, IPPROTO_IP, 1712 IPCTL_HOSTZEROBROADCAST, CTL_EOL); 1713 #if NGIF > 0 1714 sysctl_createv(clog, 0, NULL, NULL, 1715 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1716 CTLTYPE_INT, "gifttl", 1717 SYSCTL_DESCR("Default TTL for a gif tunnel datagram"), 1718 NULL, 0, &ip_gif_ttl, 0, 1719 CTL_NET, PF_INET, IPPROTO_IP, 1720 IPCTL_GIF_TTL, CTL_EOL); 1721 #endif /* NGIF */ 1722 #ifndef IPNOPRIVPORTS 1723 sysctl_createv(clog, 0, NULL, NULL, 1724 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1725 CTLTYPE_INT, "lowportmin", 1726 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1727 "to assign"), 1728 sysctl_net_inet_ip_ports, 0, &lowportmin, 0, 1729 CTL_NET, PF_INET, IPPROTO_IP, 1730 IPCTL_LOWPORTMIN, CTL_EOL); 1731 sysctl_createv(clog, 0, NULL, NULL, 1732 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1733 CTLTYPE_INT, "lowportmax", 1734 SYSCTL_DESCR("Highest privileged ephemeral port number " 1735 "to assign"), 1736 sysctl_net_inet_ip_ports, 0, &lowportmax, 0, 1737 CTL_NET, PF_INET, IPPROTO_IP, 1738 IPCTL_LOWPORTMAX, CTL_EOL); 1739 #endif /* IPNOPRIVPORTS */ 1740 #if NGRE > 0 1741 sysctl_createv(clog, 0, NULL, NULL, 1742 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1743 CTLTYPE_INT, "grettl", 1744 SYSCTL_DESCR("Default TTL for a gre tunnel datagram"), 1745 NULL, 0, &ip_gre_ttl, 0, 1746 CTL_NET, PF_INET, IPPROTO_IP, 1747 IPCTL_GRE_TTL, CTL_EOL); 1748 #endif /* NGRE */ 1749 sysctl_createv(clog, 0, NULL, NULL, 1750 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1751 CTLTYPE_INT, "checkinterface", 1752 SYSCTL_DESCR("Enable receive side of Strong ES model " 1753 "from RFC1122"), 1754 NULL, 0, &ip_checkinterface, 0, 1755 CTL_NET, PF_INET, IPPROTO_IP, 1756 IPCTL_CHECKINTERFACE, CTL_EOL); 1757 sysctl_createv(clog, 0, NULL, NULL, 1758 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1759 CTLTYPE_INT, "random_id", 1760 SYSCTL_DESCR("Assign random ip_id values"), 1761 NULL, 0, &ip_do_randomid, 0, 1762 CTL_NET, PF_INET, IPPROTO_IP, 1763 IPCTL_RANDOMID, CTL_EOL); 1764 sysctl_createv(clog, 0, NULL, NULL, 1765 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1766 CTLTYPE_INT, "do_loopback_cksum", 1767 SYSCTL_DESCR("Perform IP checksum on loopback"), 1768 NULL, 0, &ip_do_loopback_cksum, 0, 1769 CTL_NET, PF_INET, IPPROTO_IP, 1770 IPCTL_LOOPBACKCKSUM, CTL_EOL); 1771 sysctl_createv(clog, 0, NULL, NULL, 1772 CTLFLAG_PERMANENT, 1773 CTLTYPE_STRUCT, "stats", 1774 SYSCTL_DESCR("IP statistics"), 1775 sysctl_net_inet_ip_stats, 0, NULL, 0, 1776 CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, 1777 CTL_EOL); 1778 1779 /* anonportalgo RFC6056 subtree */ 1780 const struct sysctlnode *portalgo_node; 1781 sysctl_createv(clog, 0, NULL, &portalgo_node, 1782 CTLFLAG_PERMANENT, 1783 CTLTYPE_NODE, "anonportalgo", 1784 SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"), 1785 NULL, 0, NULL, 0, 1786 CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL); 1787 sysctl_createv(clog, 0, &portalgo_node, NULL, 1788 CTLFLAG_PERMANENT, 1789 CTLTYPE_STRING, "available", 1790 SYSCTL_DESCR("available algorithms"), 1791 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1792 CTL_CREATE, CTL_EOL); 1793 sysctl_createv(clog, 0, &portalgo_node, NULL, 1794 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1795 CTLTYPE_STRING, "selected", 1796 SYSCTL_DESCR("selected algorithm"), 1797 sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN, 1798 CTL_CREATE, CTL_EOL); 1799 sysctl_createv(clog, 0, &portalgo_node, NULL, 1800 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1801 CTLTYPE_STRUCT, "reserve", 1802 SYSCTL_DESCR("bitmap of reserved ports"), 1803 sysctl_portalgo_reserve4, 0, NULL, 0, 1804 CTL_CREATE, CTL_EOL); 1805 } 1806 1807 void 1808 ip_statinc(u_int stat) 1809 { 1810 1811 KASSERT(stat < IP_NSTATS); 1812 IP_STATINC(stat); 1813 } 1814