ip_input.c revision 1.74.2.1
1 /* $NetBSD: ip_input.c,v 1.74.2.1 1998/12/11 04:53:08 kenh Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1988, 1993 5 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 36 */ 37 38 /*- 39 * Copyright (c) 1998 The NetBSD Foundation, Inc. 40 * All rights reserved. 41 * 42 * This code is derived from software contributed to The NetBSD Foundation 43 * by Public Access Networks Corporation ("Panix"). It was developed under 44 * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. All advertising materials mentioning features or use of this software 55 * must display the following acknowledgement: 56 * This product includes software developed by the NetBSD 57 * Foundation, Inc. and its contributors. 58 * 4. Neither the name of The NetBSD Foundation nor the names of its 59 * contributors may be used to endorse or promote products derived 60 * from this software without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 63 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 64 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 65 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 66 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 67 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 68 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 69 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 70 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 71 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 72 * POSSIBILITY OF SUCH DAMAGE. 73 */ 74 75 #include "opt_gateway.h" 76 #include "opt_pfil_hooks.h" 77 #include "opt_mrouting.h" 78 79 #include <sys/param.h> 80 #include <sys/systm.h> 81 #include <sys/malloc.h> 82 #include <sys/mbuf.h> 83 #include <sys/domain.h> 84 #include <sys/protosw.h> 85 #include <sys/socket.h> 86 #include <sys/socketvar.h> 87 #include <sys/errno.h> 88 #include <sys/time.h> 89 #include <sys/kernel.h> 90 #include <sys/proc.h> 91 #include <sys/pool.h> 92 93 #include <vm/vm.h> 94 #include <sys/sysctl.h> 95 96 #include <net/if.h> 97 #include <net/if_dl.h> 98 #include <net/route.h> 99 #include <net/pfil.h> 100 101 #include <netinet/in.h> 102 #include <netinet/in_systm.h> 103 #include <netinet/ip.h> 104 #include <netinet/in_pcb.h> 105 #include <netinet/in_var.h> 106 #include <netinet/ip_var.h> 107 #include <netinet/ip_icmp.h> 108 109 #ifndef IPFORWARDING 110 #ifdef GATEWAY 111 #define IPFORWARDING 1 /* forward IP packets not for us */ 112 #else /* GATEWAY */ 113 #define IPFORWARDING 0 /* don't forward IP packets not for us */ 114 #endif /* GATEWAY */ 115 #endif /* IPFORWARDING */ 116 #ifndef IPSENDREDIRECTS 117 #define IPSENDREDIRECTS 1 118 #endif 119 #ifndef IPFORWSRCRT 120 #define IPFORWSRCRT 1 /* forward source-routed packets */ 121 #endif 122 #ifndef IPALLOWSRCRT 123 #define IPALLOWSRCRT 1 /* allow source-routed packets */ 124 #endif 125 #ifndef IPMTUDISC 126 #define IPMTUDISC 0 127 #endif 128 #ifndef IPMTUDISCTIMEOUT 129 #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ 130 #endif 131 132 /* 133 * Note: DIRECTED_BROADCAST is handled this way so that previous 134 * configuration using this option will Just Work. 135 */ 136 #ifndef IPDIRECTEDBCAST 137 #ifdef DIRECTED_BROADCAST 138 #define IPDIRECTEDBCAST 1 139 #else 140 #define IPDIRECTEDBCAST 0 141 #endif /* DIRECTED_BROADCAST */ 142 #endif /* IPDIRECTEDBCAST */ 143 int ipforwarding = IPFORWARDING; 144 int ipsendredirects = IPSENDREDIRECTS; 145 int ip_defttl = IPDEFTTL; 146 int ip_forwsrcrt = IPFORWSRCRT; 147 int ip_directedbcast = IPDIRECTEDBCAST; 148 int ip_allowsrcrt = IPALLOWSRCRT; 149 int ip_mtudisc = IPMTUDISC; 150 u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; 151 #ifdef DIAGNOSTIC 152 int ipprintfs = 0; 153 #endif 154 155 struct rttimer_queue *ip_mtudisc_timeout_q = NULL; 156 157 extern struct domain inetdomain; 158 extern struct protosw inetsw[]; 159 u_char ip_protox[IPPROTO_MAX]; 160 int ipqmaxlen = IFQ_MAXLEN; 161 struct in_ifaddrhead in_ifaddr; 162 struct in_ifaddrhashhead *in_ifaddrhashtbl; 163 struct ifqueue ipintrq; 164 struct ipstat ipstat; 165 u_int16_t ip_id; 166 int ip_defttl; 167 struct ipqhead ipq; 168 169 struct pool ipqent_pool; 170 171 /* 172 * We need to save the IP options in case a protocol wants to respond 173 * to an incoming packet over the same route if the packet got here 174 * using IP source routing. This allows connection establishment and 175 * maintenance when the remote end is on a network that is not known 176 * to us. 177 */ 178 int ip_nhops = 0; 179 static struct ip_srcrt { 180 struct in_addr dst; /* final destination */ 181 char nop; /* one NOP to align */ 182 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 183 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 184 } ip_srcrt; 185 186 static void save_rte __P((u_char *, struct in_addr)); 187 188 /* 189 * IP initialization: fill in IP protocol switch table. 190 * All protocols not implemented in kernel go to raw IP protocol handler. 191 */ 192 void 193 ip_init() 194 { 195 register struct protosw *pr; 196 register int i; 197 198 pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", 199 0, NULL, NULL, M_IPQ); 200 201 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 202 if (pr == 0) 203 panic("ip_init"); 204 for (i = 0; i < IPPROTO_MAX; i++) 205 ip_protox[i] = pr - inetsw; 206 for (pr = inetdomain.dom_protosw; 207 pr < inetdomain.dom_protoswNPROTOSW; pr++) 208 if (pr->pr_domain->dom_family == PF_INET && 209 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 210 ip_protox[pr->pr_protocol] = pr - inetsw; 211 LIST_INIT(&ipq); 212 ip_id = time.tv_sec & 0xffff; 213 ipintrq.ifq_maxlen = ipqmaxlen; 214 TAILQ_INIT(&in_ifaddr); 215 in_ifaddrhashtbl = 216 hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash); 217 if (ip_mtudisc != 0) 218 ip_mtudisc_timeout_q = 219 rt_timer_queue_create(ip_mtudisc_timeout); 220 #ifdef GATEWAY 221 ipflow_init(); 222 #endif 223 } 224 225 struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; 226 struct route ipforward_rt; 227 228 /* 229 * Ip input routine. Checksum and byte swap header. If fragmented 230 * try to reassemble. Process options. Pass to next level. 231 */ 232 void 233 ipintr() 234 { 235 register struct ip *ip = NULL; 236 register struct mbuf *m; 237 register struct ipq *fp; 238 register struct in_ifaddr *ia; 239 register struct ifaddr *ifa; 240 struct ipqent *ipqe; 241 int hlen = 0, mff, len, s; 242 #ifdef PFIL_HOOKS 243 struct packet_filter_hook *pfh; 244 struct mbuf *m0; 245 int rv; 246 #endif /* PFIL_HOOKS */ 247 248 next: 249 /* 250 * Get next datagram off input queue and get IP header 251 * in first mbuf. 252 */ 253 s = splimp(); 254 IF_DEQUEUE(&ipintrq, m); 255 splx(s); 256 if (m == 0) 257 return; 258 #ifdef DIAGNOSTIC 259 if ((m->m_flags & M_PKTHDR) == 0) 260 panic("ipintr no HDR"); 261 #endif 262 /* 263 * If no IP addresses have been set yet but the interfaces 264 * are receiving, can't do anything with incoming packets yet. 265 */ 266 if (in_ifaddr.tqh_first == 0) 267 goto bad; 268 ipstat.ips_total++; 269 if (m->m_len < sizeof (struct ip) && 270 (m = m_pullup(m, sizeof (struct ip))) == 0) { 271 ipstat.ips_toosmall++; 272 goto next; 273 } 274 ip = mtod(m, struct ip *); 275 if (ip->ip_v != IPVERSION) { 276 ipstat.ips_badvers++; 277 goto bad; 278 } 279 hlen = ip->ip_hl << 2; 280 if (hlen < sizeof(struct ip)) { /* minimum header length */ 281 ipstat.ips_badhlen++; 282 goto bad; 283 } 284 if (hlen > m->m_len) { 285 if ((m = m_pullup(m, hlen)) == 0) { 286 ipstat.ips_badhlen++; 287 goto next; 288 } 289 ip = mtod(m, struct ip *); 290 } 291 if ((ip->ip_sum = in_cksum(m, hlen)) != 0) { 292 ipstat.ips_badsum++; 293 goto bad; 294 } 295 296 /* 297 * Convert fields to host representation. 298 */ 299 NTOHS(ip->ip_len); 300 NTOHS(ip->ip_id); 301 NTOHS(ip->ip_off); 302 len = ip->ip_len; 303 304 /* 305 * Check that the amount of data in the buffers 306 * is as at least much as the IP header would have us expect. 307 * Trim mbufs if longer than we expect. 308 * Drop packet if shorter than we expect. 309 */ 310 if (m->m_pkthdr.len < len) { 311 ipstat.ips_tooshort++; 312 goto bad; 313 } 314 if (m->m_pkthdr.len > len) { 315 if (m->m_len == m->m_pkthdr.len) { 316 m->m_len = len; 317 m->m_pkthdr.len = len; 318 } else 319 m_adj(m, len - m->m_pkthdr.len); 320 } 321 322 /* 323 * Assume that we can create a fast-forward IP flow entry 324 * based on this packet. 325 */ 326 m->m_flags |= M_CANFASTFWD; 327 328 #ifdef PFIL_HOOKS 329 /* 330 * Run through list of hooks for input packets. If there are any 331 * filters which require that additional packets in the flow are 332 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 333 * Note that filters must _never_ set this flag, as another filter 334 * in the list may have previously cleared it. 335 */ 336 m0 = m; 337 for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.tqe_next) 338 if (pfh->pfil_func) { 339 rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0); 340 if (rv) 341 goto next; 342 m = m0; 343 if (m == NULL) 344 goto next; 345 ip = mtod(m, struct ip *); 346 } 347 #endif /* PFIL_HOOKS */ 348 349 /* 350 * Process options and, if not destined for us, 351 * ship it on. ip_dooptions returns 1 when an 352 * error was detected (causing an icmp message 353 * to be sent and the original packet to be freed). 354 */ 355 ip_nhops = 0; /* for source routed packets */ 356 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 357 goto next; 358 359 /* 360 * Check our list of addresses, to see if the packet is for us. 361 */ 362 s = splimp(); 363 INADDR_TO_IA(ip->ip_dst, ia); 364 if (ia != NULL) { 365 ifa_delref(&ia->ia_ifa); 366 splx(s); 367 goto ours; 368 } 369 if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) { 370 for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first; 371 ifa != NULL; ifa = ifa->ifa_list.tqe_next) { 372 if (ifa->ifa_addr->sa_family != AF_INET) continue; 373 ia = ifatoia(ifa); 374 /* 375 * Don't ifa_addref ia as we don't use it after 376 * we splx(s) below 377 */ 378 if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || 379 in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || 380 /* 381 * Look for all-0's host part (old broadcast addr), 382 * either for subnet or net. 383 */ 384 ip->ip_dst.s_addr == ia->ia_subnet || 385 ip->ip_dst.s_addr == ia->ia_net) { 386 splx(s); 387 goto ours; 388 } 389 /* 390 * An interface with IP address zero accepts 391 * all packets that arrive on that interface. 392 */ 393 if (in_nullhost(ia->ia_addr.sin_addr)) { 394 splx(s); 395 goto ours; 396 } 397 } 398 } 399 splx(s); 400 if (IN_MULTICAST(ip->ip_dst.s_addr)) { 401 struct in_multi *inm; 402 #ifdef MROUTING 403 extern struct socket *ip_mrouter; 404 405 if (m->m_flags & M_EXT) { 406 if ((m = m_pullup(m, hlen)) == 0) { 407 ipstat.ips_toosmall++; 408 goto next; 409 } 410 ip = mtod(m, struct ip *); 411 } 412 413 if (ip_mrouter) { 414 /* 415 * If we are acting as a multicast router, all 416 * incoming multicast packets are passed to the 417 * kernel-level multicast forwarding function. 418 * The packet is returned (relatively) intact; if 419 * ip_mforward() returns a non-zero value, the packet 420 * must be discarded, else it may be accepted below. 421 * 422 * (The IP ident field is put in the same byte order 423 * as expected when ip_mforward() is called from 424 * ip_output().) 425 */ 426 ip->ip_id = htons(ip->ip_id); 427 if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) { 428 ipstat.ips_cantforward++; 429 m_freem(m); 430 goto next; 431 } 432 ip->ip_id = ntohs(ip->ip_id); 433 434 /* 435 * The process-level routing demon needs to receive 436 * all multicast IGMP packets, whether or not this 437 * host belongs to their destination groups. 438 */ 439 if (ip->ip_p == IPPROTO_IGMP) 440 goto ours; 441 ipstat.ips_forward++; 442 } 443 #endif 444 /* 445 * See if we belong to the destination multicast group on the 446 * arrival interface. 447 */ 448 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 449 if (inm == NULL) { 450 ipstat.ips_cantforward++; 451 m_freem(m); 452 goto next; 453 } 454 goto ours; 455 } 456 if (ip->ip_dst.s_addr == INADDR_BROADCAST || 457 in_nullhost(ip->ip_dst)) 458 goto ours; 459 460 /* 461 * Not for us; forward if possible and desirable. 462 */ 463 if (ipforwarding == 0) { 464 ipstat.ips_cantforward++; 465 m_freem(m); 466 } else 467 ip_forward(m, 0); 468 goto next; 469 470 ours: 471 /* 472 * If offset or IP_MF are set, must reassemble. 473 * Otherwise, nothing need be done. 474 * (We could look in the reassembly queue to see 475 * if the packet was previously fragmented, 476 * but it's not worth the time; just let them time out.) 477 */ 478 if (ip->ip_off & ~(IP_DF|IP_RF)) { 479 /* 480 * Look for queue of fragments 481 * of this datagram. 482 */ 483 for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next) 484 if (ip->ip_id == fp->ipq_id && 485 in_hosteq(ip->ip_src, fp->ipq_src) && 486 in_hosteq(ip->ip_dst, fp->ipq_dst) && 487 ip->ip_p == fp->ipq_p) 488 goto found; 489 fp = 0; 490 found: 491 492 /* 493 * Adjust ip_len to not reflect header, 494 * set ipqe_mff if more fragments are expected, 495 * convert offset of this to bytes. 496 */ 497 ip->ip_len -= hlen; 498 mff = (ip->ip_off & IP_MF) != 0; 499 if (mff) { 500 /* 501 * Make sure that fragments have a data length 502 * that's a non-zero multiple of 8 bytes. 503 */ 504 if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) { 505 ipstat.ips_badfrags++; 506 goto bad; 507 } 508 } 509 ip->ip_off <<= 3; 510 511 /* 512 * If datagram marked as having more fragments 513 * or if this is not the first fragment, 514 * attempt reassembly; if it succeeds, proceed. 515 */ 516 if (mff || ip->ip_off) { 517 ipstat.ips_fragments++; 518 ipqe = pool_get(&ipqent_pool, PR_NOWAIT); 519 if (ipqe == NULL) { 520 ipstat.ips_rcvmemdrop++; 521 goto bad; 522 } 523 ipqe->ipqe_mff = mff; 524 ipqe->ipqe_m = m; 525 ipqe->ipqe_ip = ip; 526 m = ip_reass(ipqe, fp); 527 if (m == 0) 528 goto next; 529 ipstat.ips_reassembled++; 530 ip = mtod(m, struct ip *); 531 hlen = ip->ip_hl << 2; 532 } else 533 if (fp) 534 ip_freef(fp); 535 } else 536 ip->ip_len -= hlen; 537 538 /* 539 * Switch out to protocol's input routine. 540 */ 541 ipstat.ips_delivered++; 542 (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen); 543 goto next; 544 bad: 545 m_freem(m); 546 goto next; 547 } 548 549 /* 550 * Take incoming datagram fragment and try to 551 * reassemble it into whole datagram. If a chain for 552 * reassembly of this datagram already exists, then it 553 * is given as fp; otherwise have to make a chain. 554 */ 555 struct mbuf * 556 ip_reass(ipqe, fp) 557 register struct ipqent *ipqe; 558 register struct ipq *fp; 559 { 560 register struct mbuf *m = ipqe->ipqe_m; 561 register struct ipqent *nq, *p, *q; 562 struct ip *ip; 563 struct mbuf *t; 564 int hlen = ipqe->ipqe_ip->ip_hl << 2; 565 int i, next; 566 567 /* 568 * Presence of header sizes in mbufs 569 * would confuse code below. 570 */ 571 m->m_data += hlen; 572 m->m_len -= hlen; 573 574 /* 575 * If first fragment to arrive, create a reassembly queue. 576 */ 577 if (fp == 0) { 578 MALLOC(fp, struct ipq *, sizeof (struct ipq), 579 M_FTABLE, M_NOWAIT); 580 if (fp == NULL) 581 goto dropfrag; 582 LIST_INSERT_HEAD(&ipq, fp, ipq_q); 583 fp->ipq_ttl = IPFRAGTTL; 584 fp->ipq_p = ipqe->ipqe_ip->ip_p; 585 fp->ipq_id = ipqe->ipqe_ip->ip_id; 586 LIST_INIT(&fp->ipq_fragq); 587 fp->ipq_src = ipqe->ipqe_ip->ip_src; 588 fp->ipq_dst = ipqe->ipqe_ip->ip_dst; 589 p = NULL; 590 goto insert; 591 } 592 593 /* 594 * Find a segment which begins after this one does. 595 */ 596 for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL; 597 p = q, q = q->ipqe_q.le_next) 598 if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off) 599 break; 600 601 /* 602 * If there is a preceding segment, it may provide some of 603 * our data already. If so, drop the data from the incoming 604 * segment. If it provides all of our data, drop us. 605 */ 606 if (p != NULL) { 607 i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len - 608 ipqe->ipqe_ip->ip_off; 609 if (i > 0) { 610 if (i >= ipqe->ipqe_ip->ip_len) 611 goto dropfrag; 612 m_adj(ipqe->ipqe_m, i); 613 ipqe->ipqe_ip->ip_off += i; 614 ipqe->ipqe_ip->ip_len -= i; 615 } 616 } 617 618 /* 619 * While we overlap succeeding segments trim them or, 620 * if they are completely covered, dequeue them. 621 */ 622 for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len > 623 q->ipqe_ip->ip_off; q = nq) { 624 i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) - 625 q->ipqe_ip->ip_off; 626 if (i < q->ipqe_ip->ip_len) { 627 q->ipqe_ip->ip_len -= i; 628 q->ipqe_ip->ip_off += i; 629 m_adj(q->ipqe_m, i); 630 break; 631 } 632 nq = q->ipqe_q.le_next; 633 m_freem(q->ipqe_m); 634 LIST_REMOVE(q, ipqe_q); 635 pool_put(&ipqent_pool, q); 636 } 637 638 insert: 639 /* 640 * Stick new segment in its place; 641 * check for complete reassembly. 642 */ 643 if (p == NULL) { 644 LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q); 645 } else { 646 LIST_INSERT_AFTER(p, ipqe, ipqe_q); 647 } 648 next = 0; 649 for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL; 650 p = q, q = q->ipqe_q.le_next) { 651 if (q->ipqe_ip->ip_off != next) 652 return (0); 653 next += q->ipqe_ip->ip_len; 654 } 655 if (p->ipqe_mff) 656 return (0); 657 658 /* 659 * Reassembly is complete. Check for a bogus message size and 660 * concatenate fragments. 661 */ 662 q = fp->ipq_fragq.lh_first; 663 ip = q->ipqe_ip; 664 if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) { 665 ipstat.ips_toolong++; 666 ip_freef(fp); 667 return (0); 668 } 669 m = q->ipqe_m; 670 t = m->m_next; 671 m->m_next = 0; 672 m_cat(m, t); 673 nq = q->ipqe_q.le_next; 674 pool_put(&ipqent_pool, q); 675 for (q = nq; q != NULL; q = nq) { 676 t = q->ipqe_m; 677 nq = q->ipqe_q.le_next; 678 pool_put(&ipqent_pool, q); 679 m_cat(m, t); 680 } 681 682 /* 683 * Create header for new ip packet by 684 * modifying header of first packet; 685 * dequeue and discard fragment reassembly header. 686 * Make header visible. 687 */ 688 ip->ip_len = next; 689 ip->ip_src = fp->ipq_src; 690 ip->ip_dst = fp->ipq_dst; 691 LIST_REMOVE(fp, ipq_q); 692 FREE(fp, M_FTABLE); 693 m->m_len += (ip->ip_hl << 2); 694 m->m_data -= (ip->ip_hl << 2); 695 /* some debugging cruft by sklower, below, will go away soon */ 696 if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */ 697 register int plen = 0; 698 for (t = m; t; t = t->m_next) 699 plen += t->m_len; 700 m->m_pkthdr.len = plen; 701 } 702 return (m); 703 704 dropfrag: 705 ipstat.ips_fragdropped++; 706 m_freem(m); 707 pool_put(&ipqent_pool, ipqe); 708 return (0); 709 } 710 711 /* 712 * Free a fragment reassembly header and all 713 * associated datagrams. 714 */ 715 void 716 ip_freef(fp) 717 struct ipq *fp; 718 { 719 register struct ipqent *q, *p; 720 721 for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) { 722 p = q->ipqe_q.le_next; 723 m_freem(q->ipqe_m); 724 LIST_REMOVE(q, ipqe_q); 725 pool_put(&ipqent_pool, q); 726 } 727 LIST_REMOVE(fp, ipq_q); 728 FREE(fp, M_FTABLE); 729 } 730 731 /* 732 * IP timer processing; 733 * if a timer expires on a reassembly 734 * queue, discard it. 735 */ 736 void 737 ip_slowtimo() 738 { 739 register struct ipq *fp, *nfp; 740 int s = splsoftnet(); 741 742 for (fp = ipq.lh_first; fp != NULL; fp = nfp) { 743 nfp = fp->ipq_q.le_next; 744 if (--fp->ipq_ttl == 0) { 745 ipstat.ips_fragtimeout++; 746 ip_freef(fp); 747 } 748 } 749 #ifdef GATEWAY 750 ipflow_slowtimo(); 751 #endif 752 splx(s); 753 } 754 755 /* 756 * Drain off all datagram fragments. 757 */ 758 void 759 ip_drain() 760 { 761 762 while (ipq.lh_first != NULL) { 763 ipstat.ips_fragdropped++; 764 ip_freef(ipq.lh_first); 765 } 766 } 767 768 /* 769 * Do option processing on a datagram, 770 * possibly discarding it if bad options are encountered, 771 * or forwarding it if source-routed. 772 * Returns 1 if packet has been forwarded/freed, 773 * 0 if the packet should be processed further. 774 */ 775 int 776 ip_dooptions(m) 777 struct mbuf *m; 778 { 779 register struct ip *ip = mtod(m, struct ip *); 780 register u_char *cp; 781 register struct ip_timestamp *ipt; 782 register struct in_ifaddr *ia; 783 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 784 struct in_addr *sin, dst; 785 n_time ntime; 786 787 dst = ip->ip_dst; 788 cp = (u_char *)(ip + 1); 789 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 790 for (; cnt > 0; cnt -= optlen, cp += optlen) { 791 opt = cp[IPOPT_OPTVAL]; 792 if (opt == IPOPT_EOL) 793 break; 794 if (opt == IPOPT_NOP) 795 optlen = 1; 796 else { 797 optlen = cp[IPOPT_OLEN]; 798 if (optlen <= 0 || optlen > cnt) { 799 code = &cp[IPOPT_OLEN] - (u_char *)ip; 800 goto bad; 801 } 802 } 803 switch (opt) { 804 805 default: 806 break; 807 808 /* 809 * Source routing with record. 810 * Find interface with current destination address. 811 * If none on this machine then drop if strictly routed, 812 * or do nothing if loosely routed. 813 * Record interface address and bring up next address 814 * component. If strictly routed make sure next 815 * address is on directly accessible net. 816 */ 817 case IPOPT_LSRR: 818 case IPOPT_SSRR: 819 if (ip_allowsrcrt == 0) { 820 type = ICMP_UNREACH; 821 code = ICMP_UNREACH_NET_PROHIB; 822 goto bad; 823 } 824 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 825 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 826 goto bad; 827 } 828 ipaddr.sin_addr = ip->ip_dst; 829 ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))); 830 if (ia == 0) { 831 if (opt == IPOPT_SSRR) { 832 type = ICMP_UNREACH; 833 code = ICMP_UNREACH_SRCFAIL; 834 goto bad; 835 } 836 /* 837 * Loose routing, and not at next destination 838 * yet; nothing to do except forward. 839 */ 840 break; 841 } 842 off--; /* 0 origin */ 843 if (off > optlen - sizeof(struct in_addr)) { 844 /* 845 * End of source route. Should be for us. 846 */ 847 save_rte(cp, ip->ip_src); 848 ifa_delref(&ia->ia_ifa); 849 break; 850 } 851 /* 852 * locate outgoing interface 853 */ 854 bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr, 855 sizeof(ipaddr.sin_addr)); 856 ifa_delref(&ia->ia_ifa); 857 if (opt == IPOPT_SSRR) { 858 #define INA struct in_ifaddr * 859 #define SA struct sockaddr * 860 ia = (INA)ifa_ifwithladdr((SA)&ipaddr); 861 } else 862 ia = ip_rtaddr(ipaddr.sin_addr); 863 if (ia == 0) { 864 type = ICMP_UNREACH; 865 code = ICMP_UNREACH_SRCFAIL; 866 goto bad; 867 } 868 ip->ip_dst = ipaddr.sin_addr; 869 bcopy((caddr_t)&ia->ia_addr.sin_addr, 870 (caddr_t)(cp + off), sizeof(struct in_addr)); 871 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 872 /* 873 * Let ip_intr's mcast routing check handle mcast pkts 874 */ 875 forward = !IN_MULTICAST(ip->ip_dst.s_addr); 876 ifa_delref(&ia->ia_ifa); 877 break; 878 879 case IPOPT_RR: 880 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 881 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 882 goto bad; 883 } 884 /* 885 * If no space remains, ignore. 886 */ 887 off--; /* 0 origin */ 888 if (off > optlen - sizeof(struct in_addr)) 889 break; 890 bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr, 891 sizeof(ipaddr.sin_addr)); 892 /* 893 * locate outgoing interface; if we're the destination, 894 * use the incoming interface (should be same). 895 */ 896 if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 && 897 (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) { 898 type = ICMP_UNREACH; 899 code = ICMP_UNREACH_HOST; 900 goto bad; 901 } 902 bcopy((caddr_t)&ia->ia_addr.sin_addr, 903 (caddr_t)(cp + off), sizeof(struct in_addr)); 904 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 905 ifa_delref(&ia->ia_ifa); 906 break; 907 908 case IPOPT_TS: 909 code = cp - (u_char *)ip; 910 ipt = (struct ip_timestamp *)cp; 911 if (ipt->ipt_len < 5) 912 goto bad; 913 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { 914 if (++ipt->ipt_oflw == 0) 915 goto bad; 916 break; 917 } 918 sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1); 919 switch (ipt->ipt_flg) { 920 921 case IPOPT_TS_TSONLY: 922 break; 923 924 case IPOPT_TS_TSANDADDR: 925 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 926 sizeof(struct in_addr) > ipt->ipt_len) 927 goto bad; 928 ipaddr.sin_addr = dst; 929 ia = (INA)ifaof_ifpforaddr((SA)&ipaddr, 930 m->m_pkthdr.rcvif); 931 if (ia == 0) 932 continue; 933 bcopy((caddr_t)&ia->ia_addr.sin_addr, 934 (caddr_t)sin, sizeof(struct in_addr)); 935 ifa_delref(&ia->ia_ifa); 936 ipt->ipt_ptr += sizeof(struct in_addr); 937 break; 938 939 case IPOPT_TS_PRESPEC: 940 if (ipt->ipt_ptr - 1 + sizeof(n_time) + 941 sizeof(struct in_addr) > ipt->ipt_len) 942 goto bad; 943 bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr, 944 sizeof(struct in_addr)); 945 ia = (INA)ifa_ifwithaddr((SA)&ipaddr); 946 if (ia == 0) 947 continue; 948 ifa_delref(&ia->ia_ifa); 949 ipt->ipt_ptr += sizeof(struct in_addr); 950 break; 951 952 default: 953 goto bad; 954 } 955 ntime = iptime(); 956 bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1, 957 sizeof(n_time)); 958 ipt->ipt_ptr += sizeof(n_time); 959 } 960 } 961 if (forward) { 962 if (ip_forwsrcrt == 0) { 963 type = ICMP_UNREACH; 964 code = ICMP_UNREACH_SRCFAIL; 965 goto bad; 966 } 967 ip_forward(m, 1); 968 return (1); 969 } 970 return (0); 971 bad: 972 ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */ 973 icmp_error(m, type, code, 0, 0); 974 ipstat.ips_badoptions++; 975 return (1); 976 } 977 978 /* 979 * Given address of next destination (final or next hop), 980 * return internet address info of interface to be used to get there. 981 */ 982 struct in_ifaddr * 983 ip_rtaddr(dst) 984 struct in_addr dst; 985 { 986 register struct sockaddr_in *sin; 987 struct in_ifaddr *ia; 988 int s; 989 990 sin = satosin(&ipforward_rt.ro_dst); 991 992 if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) { 993 if (ipforward_rt.ro_rt) { 994 RTFREE(ipforward_rt.ro_rt); 995 ipforward_rt.ro_rt = 0; 996 } 997 sin->sin_family = AF_INET; 998 sin->sin_len = sizeof(*sin); 999 sin->sin_addr = dst; 1000 1001 rtalloc(&ipforward_rt); 1002 } 1003 if (ipforward_rt.ro_rt == 0) 1004 return ((struct in_ifaddr *)0); 1005 s = splimp(); 1006 ia = (ifatoia(ipforward_rt.ro_rt->rt_ifa)); 1007 ifa_addref(&ia->ia_ifa); 1008 splx(s); 1009 return ia; 1010 } 1011 1012 /* 1013 * Save incoming source route for use in replies, 1014 * to be picked up later by ip_srcroute if the receiver is interested. 1015 */ 1016 void 1017 save_rte(option, dst) 1018 u_char *option; 1019 struct in_addr dst; 1020 { 1021 unsigned olen; 1022 1023 olen = option[IPOPT_OLEN]; 1024 #ifdef DIAGNOSTIC 1025 if (ipprintfs) 1026 printf("save_rte: olen %d\n", olen); 1027 #endif 1028 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1029 return; 1030 bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen); 1031 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1032 ip_srcrt.dst = dst; 1033 } 1034 1035 /* 1036 * Retrieve incoming source route for use in replies, 1037 * in the same form used by setsockopt. 1038 * The first hop is placed before the options, will be removed later. 1039 */ 1040 struct mbuf * 1041 ip_srcroute() 1042 { 1043 register struct in_addr *p, *q; 1044 register struct mbuf *m; 1045 1046 if (ip_nhops == 0) 1047 return ((struct mbuf *)0); 1048 m = m_get(M_DONTWAIT, MT_SOOPTS); 1049 if (m == 0) 1050 return ((struct mbuf *)0); 1051 1052 #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1053 1054 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1055 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1056 OPTSIZ; 1057 #ifdef DIAGNOSTIC 1058 if (ipprintfs) 1059 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1060 #endif 1061 1062 /* 1063 * First save first hop for return route 1064 */ 1065 p = &ip_srcrt.route[ip_nhops - 1]; 1066 *(mtod(m, struct in_addr *)) = *p--; 1067 #ifdef DIAGNOSTIC 1068 if (ipprintfs) 1069 printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr)); 1070 #endif 1071 1072 /* 1073 * Copy option fields and padding (nop) to mbuf. 1074 */ 1075 ip_srcrt.nop = IPOPT_NOP; 1076 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1077 bcopy((caddr_t)&ip_srcrt.nop, 1078 mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ); 1079 q = (struct in_addr *)(mtod(m, caddr_t) + 1080 sizeof(struct in_addr) + OPTSIZ); 1081 #undef OPTSIZ 1082 /* 1083 * Record return path as an IP source route, 1084 * reversing the path (pointers are now aligned). 1085 */ 1086 while (p >= ip_srcrt.route) { 1087 #ifdef DIAGNOSTIC 1088 if (ipprintfs) 1089 printf(" %x", ntohl(q->s_addr)); 1090 #endif 1091 *q++ = *p--; 1092 } 1093 /* 1094 * Last hop goes to final destination. 1095 */ 1096 *q = ip_srcrt.dst; 1097 #ifdef DIAGNOSTIC 1098 if (ipprintfs) 1099 printf(" %x\n", ntohl(q->s_addr)); 1100 #endif 1101 return (m); 1102 } 1103 1104 /* 1105 * Strip out IP options, at higher 1106 * level protocol in the kernel. 1107 * Second argument is buffer to which options 1108 * will be moved, and return value is their length. 1109 * XXX should be deleted; last arg currently ignored. 1110 */ 1111 void 1112 ip_stripoptions(m, mopt) 1113 register struct mbuf *m; 1114 struct mbuf *mopt; 1115 { 1116 register int i; 1117 struct ip *ip = mtod(m, struct ip *); 1118 register caddr_t opts; 1119 int olen; 1120 1121 olen = (ip->ip_hl<<2) - sizeof (struct ip); 1122 opts = (caddr_t)(ip + 1); 1123 i = m->m_len - (sizeof (struct ip) + olen); 1124 bcopy(opts + olen, opts, (unsigned)i); 1125 m->m_len -= olen; 1126 if (m->m_flags & M_PKTHDR) 1127 m->m_pkthdr.len -= olen; 1128 ip->ip_hl = sizeof(struct ip) >> 2; 1129 } 1130 1131 int inetctlerrmap[PRC_NCMDS] = { 1132 0, 0, 0, 0, 1133 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1134 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1135 EMSGSIZE, EHOSTUNREACH, 0, 0, 1136 0, 0, 0, 0, 1137 ENOPROTOOPT 1138 }; 1139 1140 /* 1141 * Forward a packet. If some error occurs return the sender 1142 * an icmp packet. Note we can't always generate a meaningful 1143 * icmp message because icmp doesn't have a large enough repertoire 1144 * of codes and types. 1145 * 1146 * If not forwarding, just drop the packet. This could be confusing 1147 * if ipforwarding was zero but some routing protocol was advancing 1148 * us as a gateway to somewhere. However, we must let the routing 1149 * protocol deal with that. 1150 * 1151 * The srcrt parameter indicates whether the packet is being forwarded 1152 * via a source route. 1153 */ 1154 void 1155 ip_forward(m, srcrt) 1156 struct mbuf *m; 1157 int srcrt; 1158 { 1159 register struct ip *ip = mtod(m, struct ip *); 1160 register struct sockaddr_in *sin; 1161 register struct rtentry *rt; 1162 int error, type = 0, code = 0; 1163 struct mbuf *mcopy; 1164 n_long dest; 1165 struct ifnet *destifp; 1166 1167 dest = 0; 1168 #ifdef DIAGNOSTIC 1169 if (ipprintfs) 1170 printf("forward: src %2.2x dst %2.2x ttl %x\n", 1171 ntohl(ip->ip_src.s_addr), 1172 ntohl(ip->ip_dst.s_addr), ip->ip_ttl); 1173 #endif 1174 if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) { 1175 ipstat.ips_cantforward++; 1176 m_freem(m); 1177 return; 1178 } 1179 HTONS(ip->ip_id); 1180 if (ip->ip_ttl <= IPTTLDEC) { 1181 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1182 return; 1183 } 1184 ip->ip_ttl -= IPTTLDEC; 1185 1186 sin = satosin(&ipforward_rt.ro_dst); 1187 if ((rt = ipforward_rt.ro_rt) == 0 || 1188 !in_hosteq(ip->ip_dst, sin->sin_addr)) { 1189 if (ipforward_rt.ro_rt) { 1190 RTFREE(ipforward_rt.ro_rt); 1191 ipforward_rt.ro_rt = 0; 1192 } 1193 sin->sin_family = AF_INET; 1194 sin->sin_len = sizeof(struct sockaddr_in); 1195 sin->sin_addr = ip->ip_dst; 1196 1197 rtalloc(&ipforward_rt); 1198 if (ipforward_rt.ro_rt == 0) { 1199 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0); 1200 return; 1201 } 1202 rt = ipforward_rt.ro_rt; 1203 } 1204 1205 /* 1206 * Save at most 68 bytes of the packet in case 1207 * we need to generate an ICMP message to the src. 1208 */ 1209 mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68)); 1210 1211 /* 1212 * If forwarding packet using same interface that it came in on, 1213 * perhaps should send a redirect to sender to shortcut a hop. 1214 * Only send redirect if source is sending directly to us, 1215 * and if packet was not source routed (or has any options). 1216 * Also, don't send redirect if forwarding using a default route 1217 * or a route modified by a redirect. 1218 */ 1219 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1220 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1221 !in_nullhost(satosin(rt_key(rt))->sin_addr) && 1222 ipsendredirects && !srcrt) { 1223 if (rt->rt_ifa && 1224 (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == 1225 ifatoia(rt->rt_ifa)->ia_subnet) { 1226 if (rt->rt_flags & RTF_GATEWAY) 1227 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1228 else 1229 dest = ip->ip_dst.s_addr; 1230 /* Router requirements says to only send host redirects */ 1231 type = ICMP_REDIRECT; 1232 code = ICMP_REDIRECT_HOST; 1233 #ifdef DIAGNOSTIC 1234 if (ipprintfs) 1235 printf("redirect (%d) to %x\n", code, (u_int32_t)dest); 1236 #endif 1237 } 1238 } 1239 1240 error = ip_output(m, (struct mbuf *)0, &ipforward_rt, 1241 (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0); 1242 if (error) 1243 ipstat.ips_cantforward++; 1244 else { 1245 ipstat.ips_forward++; 1246 if (type) 1247 ipstat.ips_redirectsent++; 1248 else { 1249 if (mcopy) { 1250 #ifdef GATEWAY 1251 if (mcopy->m_flags & M_CANFASTFWD) 1252 ipflow_create(&ipforward_rt, mcopy); 1253 #endif 1254 m_freem(mcopy); 1255 } 1256 return; 1257 } 1258 } 1259 if (mcopy == NULL) 1260 return; 1261 destifp = NULL; 1262 1263 switch (error) { 1264 1265 case 0: /* forwarded, but need redirect */ 1266 /* type, code set above */ 1267 break; 1268 1269 case ENETUNREACH: /* shouldn't happen, checked above */ 1270 case EHOSTUNREACH: 1271 case ENETDOWN: 1272 case EHOSTDOWN: 1273 default: 1274 type = ICMP_UNREACH; 1275 code = ICMP_UNREACH_HOST; 1276 break; 1277 1278 case EMSGSIZE: 1279 type = ICMP_UNREACH; 1280 code = ICMP_UNREACH_NEEDFRAG; 1281 if (ipforward_rt.ro_rt) 1282 destifp = ipforward_rt.ro_rt->rt_ifp; 1283 ipstat.ips_cantfrag++; 1284 break; 1285 1286 case ENOBUFS: 1287 type = ICMP_SOURCEQUENCH; 1288 code = 0; 1289 break; 1290 } 1291 icmp_error(mcopy, type, code, dest, destifp); 1292 } 1293 1294 void 1295 ip_savecontrol(inp, mp, ip, m) 1296 register struct inpcb *inp; 1297 register struct mbuf **mp; 1298 register struct ip *ip; 1299 register struct mbuf *m; 1300 { 1301 1302 if (inp->inp_socket->so_options & SO_TIMESTAMP) { 1303 struct timeval tv; 1304 1305 microtime(&tv); 1306 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1307 SCM_TIMESTAMP, SOL_SOCKET); 1308 if (*mp) 1309 mp = &(*mp)->m_next; 1310 } 1311 if (inp->inp_flags & INP_RECVDSTADDR) { 1312 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst, 1313 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1314 if (*mp) 1315 mp = &(*mp)->m_next; 1316 } 1317 #ifdef notyet 1318 /* 1319 * XXX 1320 * Moving these out of udp_input() made them even more broken 1321 * than they already were. 1322 * - fenner (at) parc.xerox.com 1323 */ 1324 /* options were tossed already */ 1325 if (inp->inp_flags & INP_RECVOPTS) { 1326 *mp = sbcreatecontrol((caddr_t) opts_deleted_above, 1327 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1328 if (*mp) 1329 mp = &(*mp)->m_next; 1330 } 1331 /* ip_srcroute doesn't do what we want here, need to fix */ 1332 if (inp->inp_flags & INP_RECVRETOPTS) { 1333 *mp = sbcreatecontrol((caddr_t) ip_srcroute(), 1334 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1335 if (*mp) 1336 mp = &(*mp)->m_next; 1337 } 1338 #endif 1339 if (inp->inp_flags & INP_RECVIF) { 1340 struct sockaddr_dl sdl; 1341 1342 sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]); 1343 sdl.sdl_family = AF_LINK; 1344 sdl.sdl_index = m->m_pkthdr.rcvif ? 1345 m->m_pkthdr.rcvif->if_index : 0; 1346 sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0; 1347 *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len, 1348 IP_RECVIF, IPPROTO_IP); 1349 if (*mp) 1350 mp = &(*mp)->m_next; 1351 } 1352 } 1353 1354 int 1355 ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 1356 int *name; 1357 u_int namelen; 1358 void *oldp; 1359 size_t *oldlenp; 1360 void *newp; 1361 size_t newlen; 1362 { 1363 extern int subnetsarelocal; 1364 1365 int error, old; 1366 1367 /* All sysctl names at this level are terminal. */ 1368 if (namelen != 1) 1369 return (ENOTDIR); 1370 1371 switch (name[0]) { 1372 case IPCTL_FORWARDING: 1373 return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding)); 1374 case IPCTL_SENDREDIRECTS: 1375 return (sysctl_int(oldp, oldlenp, newp, newlen, 1376 &ipsendredirects)); 1377 case IPCTL_DEFTTL: 1378 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl)); 1379 #ifdef notyet 1380 case IPCTL_DEFMTU: 1381 return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu)); 1382 #endif 1383 case IPCTL_FORWSRCRT: 1384 /* Don't allow this to change in a secure environment. */ 1385 if (securelevel > 0) 1386 return (sysctl_rdint(oldp, oldlenp, newp, 1387 ip_forwsrcrt)); 1388 else 1389 return (sysctl_int(oldp, oldlenp, newp, newlen, 1390 &ip_forwsrcrt)); 1391 case IPCTL_DIRECTEDBCAST: 1392 return (sysctl_int(oldp, oldlenp, newp, newlen, 1393 &ip_directedbcast)); 1394 case IPCTL_ALLOWSRCRT: 1395 return (sysctl_int(oldp, oldlenp, newp, newlen, 1396 &ip_allowsrcrt)); 1397 case IPCTL_SUBNETSARELOCAL: 1398 return (sysctl_int(oldp, oldlenp, newp, newlen, 1399 &subnetsarelocal)); 1400 case IPCTL_MTUDISC: 1401 error = sysctl_int(oldp, oldlenp, newp, newlen, 1402 &ip_mtudisc); 1403 if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) { 1404 ip_mtudisc_timeout_q = 1405 rt_timer_queue_create(ip_mtudisc_timeout); 1406 } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) { 1407 rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE); 1408 ip_mtudisc_timeout_q = NULL; 1409 } 1410 return error; 1411 case IPCTL_ANONPORTMIN: 1412 old = anonportmin; 1413 error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin); 1414 if (anonportmin >= anonportmax || anonportmin > 65535 1415 #ifndef IPNOPRIVPORTS 1416 || anonportmin < IPPORT_RESERVED 1417 #endif 1418 ) { 1419 anonportmin = old; 1420 return (EINVAL); 1421 } 1422 return (error); 1423 case IPCTL_ANONPORTMAX: 1424 old = anonportmax; 1425 error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax); 1426 if (anonportmin >= anonportmax || anonportmax > 65535 1427 #ifndef IPNOPRIVPORTS 1428 || anonportmax < IPPORT_RESERVED 1429 #endif 1430 ) { 1431 anonportmax = old; 1432 return (EINVAL); 1433 } 1434 return (error); 1435 case IPCTL_MTUDISCTIMEOUT: 1436 error = sysctl_int(oldp, oldlenp, newp, newlen, 1437 &ip_mtudisc_timeout); 1438 if (ip_mtudisc_timeout_q != NULL) 1439 rt_timer_queue_change(ip_mtudisc_timeout_q, 1440 ip_mtudisc_timeout); 1441 return (error); 1442 #ifdef GATEWAY 1443 case IPCTL_MAXFLOWS: 1444 { 1445 int s; 1446 1447 error = sysctl_int(oldp, oldlenp, newp, newlen, 1448 &ip_maxflows); 1449 s = splsoftnet(); 1450 ipflow_reap(0); 1451 splx(s); 1452 return (error); 1453 } 1454 #endif 1455 default: 1456 return (EOPNOTSUPP); 1457 } 1458 /* NOTREACHED */ 1459 } 1460
Indexes created Sun Oct 19 02:09:48 GMT 2025