ip_input.c revision 27669
1/* 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 34 * $Id: ip_input.c,v 1.63 1997/06/02 05:02:36 julian Exp $ 35 * $ANA: ip_input.c,v 1.5 1996/09/18 14:34:59 wollman Exp $ 36 */ 37 38#define _IP_VHL 39 40#include "opt_ipfw.h" 41 42#include <stddef.h> 43 44#include <sys/param.h> 45#include <sys/systm.h> 46#include <sys/malloc.h> 47#include <sys/mbuf.h> 48#include <sys/domain.h> 49#include <sys/protosw.h> 50#include <sys/socket.h> 51#include <sys/errno.h> 52#include <sys/time.h> 53#include <sys/kernel.h> 54#include <sys/syslog.h> 55#include <sys/sysctl.h> 56 57#include <net/if.h> 58#include <net/if_dl.h> 59#include <net/route.h> 60#include <net/netisr.h> 61 62#include <netinet/in.h> 63#include <netinet/in_systm.h> 64#include <netinet/in_var.h> 65#include <netinet/ip.h> 66#include <netinet/in_pcb.h> 67#include <netinet/in_var.h> 68#include <netinet/ip_var.h> 69#include <netinet/ip_icmp.h> 70#include <machine/in_cksum.h> 71 72#include <sys/socketvar.h> 73 74#ifdef IPFIREWALL 75#include <netinet/ip_fw.h> 76#endif 77 78int rsvp_on = 0; 79static int ip_rsvp_on; 80struct socket *ip_rsvpd; 81 82static int ipforwarding = 0; 83SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_RW, 84 &ipforwarding, 0, ""); 85 86static int ipsendredirects = 1; /* XXX */ 87SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW, 88 &ipsendredirects, 0, ""); 89 90int ip_defttl = IPDEFTTL; 91SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW, 92 &ip_defttl, 0, ""); 93 94static int ip_dosourceroute = 0; 95SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW, 96 &ip_dosourceroute, 0, ""); 97#ifdef DIAGNOSTIC 98static int ipprintfs = 0; 99#endif 100 101extern struct domain inetdomain; 102extern struct protosw inetsw[]; 103u_char ip_protox[IPPROTO_MAX]; 104static int ipqmaxlen = IFQ_MAXLEN; 105struct in_ifaddrhead in_ifaddrhead; /* first inet address */ 106struct ifqueue ipintrq; 107SYSCTL_INT(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, CTLFLAG_RD, 108 &ipintrq.ifq_maxlen, 0, ""); 109SYSCTL_INT(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, CTLFLAG_RD, 110 &ipintrq.ifq_drops, 0, ""); 111 112struct ipstat ipstat; 113static struct ipq ipq; 114 115#ifdef IPCTL_DEFMTU 116SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW, 117 &ip_mtu, 0, ""); 118#endif 119 120#if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 121#undef COMPAT_IPFW 122#define COMPAT_IPFW 1 123#else 124#undef COMPAT_IPFW 125#endif 126 127#ifdef COMPAT_IPFW 128/* Firewall hooks */ 129ip_fw_chk_t *ip_fw_chk_ptr; 130ip_fw_ctl_t *ip_fw_ctl_ptr; 131 132/* IP Network Address Translation (NAT) hooks */ 133ip_nat_t *ip_nat_ptr; 134ip_nat_ctl_t *ip_nat_ctl_ptr; 135#endif 136 137#if defined(IPFILTER_LKM) || defined(IPFILTER) 138int fr_check __P((struct ip *, int, struct ifnet *, int, struct mbuf **)); 139int (*fr_checkp) __P((struct ip *, int, struct ifnet *, int, struct mbuf **)) = NULL; 140#endif 141 142 143/* 144 * We need to save the IP options in case a protocol wants to respond 145 * to an incoming packet over the same route if the packet got here 146 * using IP source routing. This allows connection establishment and 147 * maintenance when the remote end is on a network that is not known 148 * to us. 149 */ 150static int ip_nhops = 0; 151static struct ip_srcrt { 152 struct in_addr dst; /* final destination */ 153 char nop; /* one NOP to align */ 154 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 155 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 156} ip_srcrt; 157 158#ifdef IPDIVERT 159/* 160 * Shared variable between ip_input() and ip_reass() to communicate 161 * about which packets, once assembled from fragments, get diverted, 162 * and to which port. 163 */ 164static u_short frag_divert_port; 165#endif 166 167static void save_rte __P((u_char *, struct in_addr)); 168static void ip_deq __P((struct ipasfrag *)); 169static int ip_dooptions __P((struct mbuf *)); 170static void ip_enq __P((struct ipasfrag *, struct ipasfrag *)); 171static void ip_forward __P((struct mbuf *, int)); 172static void ip_freef __P((struct ipq *)); 173static struct ip * 174 ip_reass __P((struct ipasfrag *, struct ipq *)); 175static struct in_ifaddr * 176 ip_rtaddr __P((struct in_addr)); 177static void ipintr __P((void)); 178/* 179 * IP initialization: fill in IP protocol switch table. 180 * All protocols not implemented in kernel go to raw IP protocol handler. 181 */ 182void 183ip_init() 184{ 185 register struct protosw *pr; 186 register int i; 187 188 TAILQ_INIT(&in_ifaddrhead); 189 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 190 if (pr == 0) 191 panic("ip_init"); 192 for (i = 0; i < IPPROTO_MAX; i++) 193 ip_protox[i] = pr - inetsw; 194 for (pr = inetdomain.dom_protosw; 195 pr < inetdomain.dom_protoswNPROTOSW; pr++) 196 if (pr->pr_domain->dom_family == PF_INET && 197 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 198 ip_protox[pr->pr_protocol] = pr - inetsw; 199 ipq.next = ipq.prev = &ipq; 200 ip_id = time.tv_sec & 0xffff; 201 ipintrq.ifq_maxlen = ipqmaxlen; 202#ifdef IPFIREWALL 203 ip_fw_init(); 204#endif 205#ifdef IPNAT 206 ip_nat_init(); 207#endif 208 209} 210 211static struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; 212static struct route ipforward_rt; 213 214/* 215 * Ip input routine. Checksum and byte swap header. If fragmented 216 * try to reassemble. Process options. Pass to next level. 217 */ 218void 219ip_input(struct mbuf *m) 220{ 221 struct ip *ip; 222 struct ipq *fp; 223 struct in_ifaddr *ia; 224 int hlen; 225 u_short sum; 226 227#ifdef DIAGNOSTIC 228 if ((m->m_flags & M_PKTHDR) == 0) 229 panic("ip_input no HDR"); 230#endif 231 /* 232 * If no IP addresses have been set yet but the interfaces 233 * are receiving, can't do anything with incoming packets yet. 234 * XXX This is broken! We should be able to receive broadcasts 235 * and multicasts even without any local addresses configured. 236 */ 237 if (TAILQ_EMPTY(&in_ifaddrhead)) 238 goto bad; 239 ipstat.ips_total++; 240 241 if (m->m_pkthdr.len < sizeof(struct ip)) 242 goto tooshort; 243 244#ifdef DIAGNOSTIC 245 if (m->m_len < sizeof(struct ip)) 246 panic("ipintr mbuf too short"); 247#endif 248 249 if (m->m_len < sizeof (struct ip) && 250 (m = m_pullup(m, sizeof (struct ip))) == 0) { 251 ipstat.ips_toosmall++; 252 return; 253 } 254 ip = mtod(m, struct ip *); 255 256 if (IP_VHL_V(ip->ip_vhl) != IPVERSION) { 257 ipstat.ips_badvers++; 258 goto bad; 259 } 260 261 hlen = IP_VHL_HL(ip->ip_vhl) << 2; 262 if (hlen < sizeof(struct ip)) { /* minimum header length */ 263 ipstat.ips_badhlen++; 264 goto bad; 265 } 266 if (hlen > m->m_len) { 267 if ((m = m_pullup(m, hlen)) == 0) { 268 ipstat.ips_badhlen++; 269 return; 270 } 271 ip = mtod(m, struct ip *); 272 } 273 if (hlen == sizeof(struct ip)) { 274 sum = in_cksum_hdr(ip); 275 } else { 276 sum = in_cksum(m, hlen); 277 } 278 if (sum) { 279 ipstat.ips_badsum++; 280 goto bad; 281 } 282 283 /* 284 * Convert fields to host representation. 285 */ 286 NTOHS(ip->ip_len); 287 if (ip->ip_len < hlen) { 288 ipstat.ips_badlen++; 289 goto bad; 290 } 291 NTOHS(ip->ip_id); 292 NTOHS(ip->ip_off); 293 294 /* 295 * Check that the amount of data in the buffers 296 * is as at least much as the IP header would have us expect. 297 * Trim mbufs if longer than we expect. 298 * Drop packet if shorter than we expect. 299 */ 300 if (m->m_pkthdr.len < ip->ip_len) { 301tooshort: 302 ipstat.ips_tooshort++; 303 goto bad; 304 } 305 if (m->m_pkthdr.len > ip->ip_len) { 306 if (m->m_len == m->m_pkthdr.len) { 307 m->m_len = ip->ip_len; 308 m->m_pkthdr.len = ip->ip_len; 309 } else 310 m_adj(m, ip->ip_len - m->m_pkthdr.len); 311 } 312 /* 313 * IpHack's section. 314 * Right now when no processing on packet has done 315 * and it is still fresh out of network we do our black 316 * deals with it. 317 * - Firewall: deny/allow/divert 318 * - Xlate: translate packet's addr/port (NAT). 319 * - Wrap: fake packet's addr/port <unimpl.> 320 * - Encapsulate: put it in another IP and send out. <unimp.> 321 */ 322#if defined(IPFILTER) || defined(IPFILTER_LKM) 323 /* 324 * Check if we want to allow this packet to be processed. 325 * Consider it to be bad if not. 326 */ 327 if (fr_check) { 328 struct mbuf *m1 = m; 329 330 if ((*fr_checkp)(ip, hlen, m->m_pkthdr.rcvif, 0, &m1) || !m1) 331 return; 332 ip = mtod(m = m1, struct ip *); 333 } 334#endif 335#ifdef COMPAT_IPFW 336 if (ip_fw_chk_ptr) { 337#ifdef IPDIVERT 338 u_short port; 339 340 port = (*ip_fw_chk_ptr)(&ip, hlen, NULL, ip_divert_ignore, &m); 341 ip_divert_ignore = 0; 342 if (port) { /* Divert packet */ 343 frag_divert_port = port; 344 goto ours; 345 } 346#else 347 /* If ipfw says divert, we have to just drop packet */ 348 if ((*ip_fw_chk_ptr)(&ip, hlen, NULL, 0, &m)) { 349 m_freem(m); 350 m = NULL; 351 } 352#endif 353 if (!m) 354 return; 355 } 356 357 if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, m->m_pkthdr.rcvif, IP_NAT_IN)) 358 return; 359#endif 360 361 /* 362 * Process options and, if not destined for us, 363 * ship it on. ip_dooptions returns 1 when an 364 * error was detected (causing an icmp message 365 * to be sent and the original packet to be freed). 366 */ 367 ip_nhops = 0; /* for source routed packets */ 368 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 369 return; 370 371 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 372 * matter if it is destined to another node, or whether it is 373 * a multicast one, RSVP wants it! and prevents it from being forwarded 374 * anywhere else. Also checks if the rsvp daemon is running before 375 * grabbing the packet. 376 */ 377 if (rsvp_on && ip->ip_p==IPPROTO_RSVP) 378 goto ours; 379 380 /* 381 * Check our list of addresses, to see if the packet is for us. 382 */ 383 for (ia = in_ifaddrhead.tqh_first; ia; ia = ia->ia_link.tqe_next) { 384#define satosin(sa) ((struct sockaddr_in *)(sa)) 385 386 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr) 387 goto ours; 388#ifdef BOOTP_COMPAT 389 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) 390 goto ours; 391#endif 392 if (ia->ia_ifp && ia->ia_ifp->if_flags & IFF_BROADCAST) { 393 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 394 ip->ip_dst.s_addr) 395 goto ours; 396 if (ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr) 397 goto ours; 398 } 399 } 400 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 401 struct in_multi *inm; 402 if (ip_mrouter) { 403 /* 404 * If we are acting as a multicast router, all 405 * incoming multicast packets are passed to the 406 * kernel-level multicast forwarding function. 407 * The packet is returned (relatively) intact; if 408 * ip_mforward() returns a non-zero value, the packet 409 * must be discarded, else it may be accepted below. 410 * 411 * (The IP ident field is put in the same byte order 412 * as expected when ip_mforward() is called from 413 * ip_output().) 414 */ 415 ip->ip_id = htons(ip->ip_id); 416 if (ip_mforward(ip, m->m_pkthdr.rcvif, m, 0) != 0) { 417 ipstat.ips_cantforward++; 418 m_freem(m); 419 return; 420 } 421 ip->ip_id = ntohs(ip->ip_id); 422 423 /* 424 * The process-level routing demon needs to receive 425 * all multicast IGMP packets, whether or not this 426 * host belongs to their destination groups. 427 */ 428 if (ip->ip_p == IPPROTO_IGMP) 429 goto ours; 430 ipstat.ips_forward++; 431 } 432 /* 433 * See if we belong to the destination multicast group on the 434 * arrival interface. 435 */ 436 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 437 if (inm == NULL) { 438 ipstat.ips_notmember++; 439 m_freem(m); 440 return; 441 } 442 goto ours; 443 } 444 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 445 goto ours; 446 if (ip->ip_dst.s_addr == INADDR_ANY) 447 goto ours; 448 449 /* 450 * Not for us; forward if possible and desirable. 451 */ 452 if (ipforwarding == 0) { 453 ipstat.ips_cantforward++; 454 m_freem(m); 455 } else 456 ip_forward(m, 0); 457 return; 458 459ours: 460 461 /* 462 * If offset or IP_MF are set, must reassemble. 463 * Otherwise, nothing need be done. 464 * (We could look in the reassembly queue to see 465 * if the packet was previously fragmented, 466 * but it's not worth the time; just let them time out.) 467 */ 468 if (ip->ip_off & (IP_MF | IP_OFFMASK)) { 469 if (m->m_flags & M_EXT) { /* XXX */ 470 if ((m = m_pullup(m, sizeof (struct ip))) == 0) { 471 ipstat.ips_toosmall++; 472#ifdef IPDIVERT 473 frag_divert_port = 0; 474#endif 475 return; 476 } 477 ip = mtod(m, struct ip *); 478 } 479 /* 480 * Look for queue of fragments 481 * of this datagram. 482 */ 483 for (fp = ipq.next; fp != &ipq; fp = fp->next) 484 if (ip->ip_id == fp->ipq_id && 485 ip->ip_src.s_addr == fp->ipq_src.s_addr && 486 ip->ip_dst.s_addr == fp->ipq_dst.s_addr && 487 ip->ip_p == fp->ipq_p) 488 goto found; 489 fp = 0; 490found: 491 492 /* 493 * Adjust ip_len to not reflect header, 494 * set ip_mff if more fragments are expected, 495 * convert offset of this to bytes. 496 */ 497 ip->ip_len -= hlen; 498 ((struct ipasfrag *)ip)->ipf_mff &= ~1; 499 if (ip->ip_off & IP_MF) 500 ((struct ipasfrag *)ip)->ipf_mff |= 1; 501 ip->ip_off <<= 3; 502 503 /* 504 * If datagram marked as having more fragments 505 * or if this is not the first fragment, 506 * attempt reassembly; if it succeeds, proceed. 507 */ 508 if (((struct ipasfrag *)ip)->ipf_mff & 1 || ip->ip_off) { 509 ipstat.ips_fragments++; 510 ip = ip_reass((struct ipasfrag *)ip, fp); 511 if (ip == 0) 512 return; 513 ipstat.ips_reassembled++; 514 m = dtom(ip); 515#ifdef IPDIVERT 516 if (frag_divert_port) { 517 ip->ip_len += hlen; 518 HTONS(ip->ip_len); 519 HTONS(ip->ip_off); 520 HTONS(ip->ip_id); 521 ip->ip_sum = 0; 522 ip->ip_sum = in_cksum_hdr(ip); 523 NTOHS(ip->ip_id); 524 NTOHS(ip->ip_off); 525 NTOHS(ip->ip_len); 526 ip->ip_len -= hlen; 527 } 528#endif 529 } else 530 if (fp) 531 ip_freef(fp); 532 } else 533 ip->ip_len -= hlen; 534 535#ifdef IPDIVERT 536 /* 537 * Divert reassembled packets to the divert protocol if required 538 */ 539 if (frag_divert_port) { 540 ipstat.ips_delivered++; 541 ip_divert_port = frag_divert_port; 542 frag_divert_port = 0; 543 (*inetsw[ip_protox[IPPROTO_DIVERT]].pr_input)(m, hlen); 544 return; 545 } 546#endif 547 548 /* 549 * Switch out to protocol's input routine. 550 */ 551 ipstat.ips_delivered++; 552 (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen); 553 return; 554bad: 555 m_freem(m); 556} 557 558/* 559 * IP software interrupt routine - to go away sometime soon 560 */ 561static void 562ipintr(void) 563{ 564 int s; 565 struct mbuf *m; 566 567 while(1) { 568 s = splimp(); 569 IF_DEQUEUE(&ipintrq, m); 570 splx(s); 571 if (m == 0) 572 return; 573 ip_input(m); 574 } 575} 576 577NETISR_SET(NETISR_IP, ipintr); 578 579/* 580 * Take incoming datagram fragment and try to 581 * reassemble it into whole datagram. If a chain for 582 * reassembly of this datagram already exists, then it 583 * is given as fp; otherwise have to make a chain. 584 */ 585static struct ip * 586ip_reass(ip, fp) 587 register struct ipasfrag *ip; 588 register struct ipq *fp; 589{ 590 register struct mbuf *m = dtom(ip); 591 register struct ipasfrag *q; 592 struct mbuf *t; 593 int hlen = ip->ip_hl << 2; 594 int i, next; 595 596 /* 597 * Presence of header sizes in mbufs 598 * would confuse code below. 599 */ 600 m->m_data += hlen; 601 m->m_len -= hlen; 602 603 /* 604 * If first fragment to arrive, create a reassembly queue. 605 */ 606 if (fp == 0) { 607 if ((t = m_get(M_DONTWAIT, MT_FTABLE)) == NULL) 608 goto dropfrag; 609 fp = mtod(t, struct ipq *); 610 insque(fp, &ipq); 611 fp->ipq_ttl = IPFRAGTTL; 612 fp->ipq_p = ip->ip_p; 613 fp->ipq_id = ip->ip_id; 614 fp->ipq_next = fp->ipq_prev = (struct ipasfrag *)fp; 615 fp->ipq_src = ((struct ip *)ip)->ip_src; 616 fp->ipq_dst = ((struct ip *)ip)->ip_dst; 617#ifdef IPDIVERT 618 fp->ipq_divert = 0; 619#endif 620 q = (struct ipasfrag *)fp; 621 goto insert; 622 } 623 624 /* 625 * Find a segment which begins after this one does. 626 */ 627 for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) 628 if (q->ip_off > ip->ip_off) 629 break; 630 631 /* 632 * If there is a preceding segment, it may provide some of 633 * our data already. If so, drop the data from the incoming 634 * segment. If it provides all of our data, drop us. 635 */ 636 if (q->ipf_prev != (struct ipasfrag *)fp) { 637 i = q->ipf_prev->ip_off + q->ipf_prev->ip_len - ip->ip_off; 638 if (i > 0) { 639 if (i >= ip->ip_len) 640 goto dropfrag; 641 m_adj(dtom(ip), i); 642 ip->ip_off += i; 643 ip->ip_len -= i; 644 } 645 } 646 647 /* 648 * While we overlap succeeding segments trim them or, 649 * if they are completely covered, dequeue them. 650 */ 651 while (q != (struct ipasfrag *)fp && ip->ip_off + ip->ip_len > q->ip_off) { 652 struct mbuf *m0; 653 654 i = (ip->ip_off + ip->ip_len) - q->ip_off; 655 if (i < q->ip_len) { 656 q->ip_len -= i; 657 q->ip_off += i; 658 m_adj(dtom(q), i); 659 break; 660 } 661 m0 = dtom(q); 662 q = q->ipf_next; 663 ip_deq(q->ipf_prev); 664 m_freem(m0); 665 } 666 667insert: 668 669#ifdef IPDIVERT 670 /* 671 * Any fragment diverting causes the whole packet to divert 672 */ 673 if (frag_divert_port != 0) 674 fp->ipq_divert = frag_divert_port; 675 frag_divert_port = 0; 676#endif 677 678 /* 679 * Stick new segment in its place; 680 * check for complete reassembly. 681 */ 682 ip_enq(ip, q->ipf_prev); 683 next = 0; 684 for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) { 685 if (q->ip_off != next) 686 return (0); 687 next += q->ip_len; 688 } 689 if (q->ipf_prev->ipf_mff & 1) 690 return (0); 691 692 /* 693 * Reassembly is complete. Make sure the packet is a sane size. 694 */ 695 if (next + (IP_VHL_HL(((struct ip *)fp->ipq_next)->ip_vhl) << 2) 696 > IP_MAXPACKET) { 697 ipstat.ips_toolong++; 698 ip_freef(fp); 699 return (0); 700 } 701 702 /* 703 * Concatenate fragments. 704 */ 705 q = fp->ipq_next; 706 m = dtom(q); 707 t = m->m_next; 708 m->m_next = 0; 709 m_cat(m, t); 710 q = q->ipf_next; 711 while (q != (struct ipasfrag *)fp) { 712 t = dtom(q); 713 q = q->ipf_next; 714 m_cat(m, t); 715 } 716 717#ifdef IPDIVERT 718 /* 719 * Record divert port for packet, if any 720 */ 721 frag_divert_port = fp->ipq_divert; 722#endif 723 724 /* 725 * Create header for new ip packet by 726 * modifying header of first packet; 727 * dequeue and discard fragment reassembly header. 728 * Make header visible. 729 */ 730 ip = fp->ipq_next; 731 ip->ip_len = next; 732 ip->ipf_mff &= ~1; 733 ((struct ip *)ip)->ip_src = fp->ipq_src; 734 ((struct ip *)ip)->ip_dst = fp->ipq_dst; 735 remque(fp); 736 (void) m_free(dtom(fp)); 737 m = dtom(ip); 738 m->m_len += (ip->ip_hl << 2); 739 m->m_data -= (ip->ip_hl << 2); 740 /* some debugging cruft by sklower, below, will go away soon */ 741 if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */ 742 register int plen = 0; 743 for (t = m; m; m = m->m_next) 744 plen += m->m_len; 745 t->m_pkthdr.len = plen; 746 } 747 return ((struct ip *)ip); 748 749dropfrag: 750 ipstat.ips_fragdropped++; 751 m_freem(m); 752 return (0); 753} 754 755/* 756 * Free a fragment reassembly header and all 757 * associated datagrams. 758 */ 759static void 760ip_freef(fp) 761 struct ipq *fp; 762{ 763 register struct ipasfrag *q, *p; 764 765 for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = p) { 766 p = q->ipf_next; 767 ip_deq(q); 768 m_freem(dtom(q)); 769 } 770 remque(fp); 771 (void) m_free(dtom(fp)); 772} 773 774/* 775 * Put an ip fragment on a reassembly chain. 776 * Like insque, but pointers in middle of structure. 777 */ 778static void 779ip_enq(p, prev) 780 register struct ipasfrag *p, *prev; 781{ 782 783 p->ipf_prev = prev; 784 p->ipf_next = prev->ipf_next; 785 prev->ipf_next->ipf_prev = p; 786 prev->ipf_next = p; 787} 788 789/* 790 * To ip_enq as remque is to insque. 791 */ 792static void 793ip_deq(p) 794 register struct ipasfrag *p; 795{ 796 797 p->ipf_prev->ipf_next = p->ipf_next; 798 p->ipf_next->ipf_prev = p->ipf_prev; 799} 800 801/* 802 * IP timer processing; 803 * if a timer expires on a reassembly 804 * queue, discard it. 805 */ 806void 807ip_slowtimo() 808{ 809 register struct ipq *fp; 810 int s = splnet(); 811 812 fp = ipq.next; 813 if (fp == 0) { 814 splx(s); 815 return; 816 } 817 while (fp != &ipq) { 818 --fp->ipq_ttl; 819 fp = fp->next; 820 if (fp->prev->ipq_ttl == 0) { 821 ipstat.ips_fragtimeout++; 822 ip_freef(fp->prev); 823 } 824 } 825 splx(s); 826} 827 828/* 829 * Drain off all datagram fragments. 830 */ 831void 832ip_drain() 833{ 834 while (ipq.next != &ipq) { 835 ipstat.ips_fragdropped++; 836 ip_freef(ipq.next); 837 } 838 839 in_rtqdrain(); 840} 841 842/* 843 * Do option processing on a datagram, 844 * possibly discarding it if bad options are encountered, 845 * or forwarding it if source-routed. 846 * Returns 1 if packet has been forwarded/freed, 847 * 0 if the packet should be processed further. 848 */ 849static int 850ip_dooptions(m) 851 struct mbuf *m; 852{ 853 register struct ip *ip = mtod(m, struct ip *); 854 register u_char *cp; 855 register struct ip_timestamp *ipt; 856 register struct in_ifaddr *ia; 857 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 858 struct in_addr *sin, dst; 859 n_time ntime; 860 861 dst = ip->ip_dst; 862 cp = (u_char *)(ip + 1); 863 cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); 864 for (; cnt > 0; cnt -= optlen, cp += optlen) { 865 opt = cp[IPOPT_OPTVAL]; 866 if (opt == IPOPT_EOL) 867 break; 868 if (opt == IPOPT_NOP) 869 optlen = 1; 870 else { 871 optlen = cp[IPOPT_OLEN]; 872 if (optlen <= 0 || optlen > cnt) { 873 code = &cp[IPOPT_OLEN] - (u_char *)ip; 874 goto bad; 875 } 876 } 877 switch (opt) { 878 879 default: 880 break; 881 882 /* 883 * Source routing with record. 884 * Find interface with current destination address. 885 * If none on this machine then drop if strictly routed, 886 * or do nothing if loosely routed. 887 * Record interface address and bring up next address 888 * component. If strictly routed make sure next 889 * address is on directly accessible net. 890 */ 891 case IPOPT_LSRR: 892 case IPOPT_SSRR: 893 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 894 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 895 goto bad; 896 } 897 ipaddr.sin_addr = ip->ip_dst; 898 ia = (struct in_ifaddr *) 899 ifa_ifwithaddr((struct sockaddr *)&ipaddr); 900 if (ia == 0) { 901 if (opt == IPOPT_SSRR) { 902 type = ICMP_UNREACH; 903 code = ICMP_UNREACH_SRCFAIL; 904 goto bad; 905 } 906 /* 907 * Loose routing, and not at next destination 908 * yet; nothing to do except forward. 909 */ 910 break; 911 } 912 off--; /* 0 origin */ 913 if (off > optlen - sizeof(struct in_addr)) { 914 /* 915 * End of source route. Should be for us. 916 */ 917 save_rte(cp, ip->ip_src); 918 break; 919 } 920 921 if (!ip_dosourceroute) { 922 char buf[4*sizeof "123"]; 923 strcpy(buf, inet_ntoa(ip->ip_dst)); 924 925 log(LOG_WARNING, 926 "attempted source route from %s to %s\n", 927 inet_ntoa(ip->ip_src), buf); 928 type = ICMP_UNREACH; 929 code = ICMP_UNREACH_SRCFAIL; 930 goto bad; 931 } 932 933 /* 934 * locate outgoing interface 935 */ 936 (void)memcpy(&ipaddr.sin_addr, cp + off, 937 sizeof(ipaddr.sin_addr)); 938 939 if (opt == IPOPT_SSRR) { 940#define INA struct in_ifaddr * 941#define SA struct sockaddr * 942 if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) 943 ia = (INA)ifa_ifwithnet((SA)&ipaddr); 944 } else 945 ia = ip_rtaddr(ipaddr.sin_addr); 946 if (ia == 0) { 947 type = ICMP_UNREACH; 948 code = ICMP_UNREACH_SRCFAIL; 949 goto bad; 950 } 951 ip->ip_dst = ipaddr.sin_addr; 952 (void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr), 953 sizeof(struct in_addr)); 954 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 955 /* 956 * Let ip_intr's mcast routing check handle mcast pkts 957 */ 958 forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr)); 959 break; 960 961 case IPOPT_RR: 962 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 963 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 964 goto bad; 965 } 966 /* 967 * If no space remains, ignore. 968 */ 969 off--; /* 0 origin */ 970 if (off > optlen - sizeof(struct in_addr)) 971 break; 972 (void)memcpy(&ipaddr.sin_addr, &ip->ip_dst, 973 sizeof(ipaddr.sin_addr)); 974 /* 975 * locate outgoing interface; if we're the destination, 976 * use the incoming interface (should be same). 977 */ 978 if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 && 979 (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) { 980 type = ICMP_UNREACH; 981 code = ICMP_UNREACH_HOST; 982 goto bad; 983 } 984 (void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr), 985 sizeof(struct in_addr)); 986 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 987 break; 988 989 case IPOPT_TS: 990 code = cp - (u_char *)ip; 991 ipt = (struct ip_timestamp *)cp; 992 if (ipt->ipt_len < 5) 993 goto bad; 994 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (long)) { 995 if (++ipt->ipt_oflw == 0) 996 goto bad; 997 break; 998 } 999 sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1); 1000 switch (ipt->ipt_flg) { 1001 1002 case IPOPT_TS_TSONLY: 1003 break; 1004 1005 case IPOPT_TS_TSANDADDR: 1006 if (ipt->ipt_ptr + sizeof(n_time) + 1007 sizeof(struct in_addr) > ipt->ipt_len) 1008 goto bad; 1009 ipaddr.sin_addr = dst; 1010 ia = (INA)ifaof_ifpforaddr((SA)&ipaddr, 1011 m->m_pkthdr.rcvif); 1012 if (ia == 0) 1013 continue; 1014 (void)memcpy(sin, &IA_SIN(ia)->sin_addr, 1015 sizeof(struct in_addr)); 1016 ipt->ipt_ptr += sizeof(struct in_addr); 1017 break; 1018 1019 case IPOPT_TS_PRESPEC: 1020 if (ipt->ipt_ptr + sizeof(n_time) + 1021 sizeof(struct in_addr) > ipt->ipt_len) 1022 goto bad; 1023 (void)memcpy(&ipaddr.sin_addr, sin, 1024 sizeof(struct in_addr)); 1025 if (ifa_ifwithaddr((SA)&ipaddr) == 0) 1026 continue; 1027 ipt->ipt_ptr += sizeof(struct in_addr); 1028 break; 1029 1030 default: 1031 goto bad; 1032 } 1033 ntime = iptime(); 1034 (void)memcpy(cp + ipt->ipt_ptr - 1, &ntime, 1035 sizeof(n_time)); 1036 ipt->ipt_ptr += sizeof(n_time); 1037 } 1038 } 1039 if (forward) { 1040 ip_forward(m, 1); 1041 return (1); 1042 } 1043 return (0); 1044bad: 1045 ip->ip_len -= IP_VHL_HL(ip->ip_vhl) << 2; /* XXX icmp_error adds in hdr length */ 1046 icmp_error(m, type, code, 0, 0); 1047 ipstat.ips_badoptions++; 1048 return (1); 1049} 1050 1051/* 1052 * Given address of next destination (final or next hop), 1053 * return internet address info of interface to be used to get there. 1054 */ 1055static struct in_ifaddr * 1056ip_rtaddr(dst) 1057 struct in_addr dst; 1058{ 1059 register struct sockaddr_in *sin; 1060 1061 sin = (struct sockaddr_in *) &ipforward_rt.ro_dst; 1062 1063 if (ipforward_rt.ro_rt == 0 || dst.s_addr != sin->sin_addr.s_addr) { 1064 if (ipforward_rt.ro_rt) { 1065 RTFREE(ipforward_rt.ro_rt); 1066 ipforward_rt.ro_rt = 0; 1067 } 1068 sin->sin_family = AF_INET; 1069 sin->sin_len = sizeof(*sin); 1070 sin->sin_addr = dst; 1071 1072 rtalloc_ign(&ipforward_rt, RTF_PRCLONING); 1073 } 1074 if (ipforward_rt.ro_rt == 0) 1075 return ((struct in_ifaddr *)0); 1076 return ((struct in_ifaddr *) ipforward_rt.ro_rt->rt_ifa); 1077} 1078 1079/* 1080 * Save incoming source route for use in replies, 1081 * to be picked up later by ip_srcroute if the receiver is interested. 1082 */ 1083void 1084save_rte(option, dst) 1085 u_char *option; 1086 struct in_addr dst; 1087{ 1088 unsigned olen; 1089 1090 olen = option[IPOPT_OLEN]; 1091#ifdef DIAGNOSTIC 1092 if (ipprintfs) 1093 printf("save_rte: olen %d\n", olen); 1094#endif 1095 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1096 return; 1097 bcopy(option, ip_srcrt.srcopt, olen); 1098 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1099 ip_srcrt.dst = dst; 1100} 1101 1102/* 1103 * Retrieve incoming source route for use in replies, 1104 * in the same form used by setsockopt. 1105 * The first hop is placed before the options, will be removed later. 1106 */ 1107struct mbuf * 1108ip_srcroute() 1109{ 1110 register struct in_addr *p, *q; 1111 register struct mbuf *m; 1112 1113 if (ip_nhops == 0) 1114 return ((struct mbuf *)0); 1115 m = m_get(M_DONTWAIT, MT_SOOPTS); 1116 if (m == 0) 1117 return ((struct mbuf *)0); 1118 1119#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1120 1121 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1122 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1123 OPTSIZ; 1124#ifdef DIAGNOSTIC 1125 if (ipprintfs) 1126 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1127#endif 1128 1129 /* 1130 * First save first hop for return route 1131 */ 1132 p = &ip_srcrt.route[ip_nhops - 1]; 1133 *(mtod(m, struct in_addr *)) = *p--; 1134#ifdef DIAGNOSTIC 1135 if (ipprintfs) 1136 printf(" hops %lx", ntohl(mtod(m, struct in_addr *)->s_addr)); 1137#endif 1138 1139 /* 1140 * Copy option fields and padding (nop) to mbuf. 1141 */ 1142 ip_srcrt.nop = IPOPT_NOP; 1143 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1144 (void)memcpy(mtod(m, caddr_t) + sizeof(struct in_addr), 1145 &ip_srcrt.nop, OPTSIZ); 1146 q = (struct in_addr *)(mtod(m, caddr_t) + 1147 sizeof(struct in_addr) + OPTSIZ); 1148#undef OPTSIZ 1149 /* 1150 * Record return path as an IP source route, 1151 * reversing the path (pointers are now aligned). 1152 */ 1153 while (p >= ip_srcrt.route) { 1154#ifdef DIAGNOSTIC 1155 if (ipprintfs) 1156 printf(" %lx", ntohl(q->s_addr)); 1157#endif 1158 *q++ = *p--; 1159 } 1160 /* 1161 * Last hop goes to final destination. 1162 */ 1163 *q = ip_srcrt.dst; 1164#ifdef DIAGNOSTIC 1165 if (ipprintfs) 1166 printf(" %lx\n", ntohl(q->s_addr)); 1167#endif 1168 return (m); 1169} 1170 1171/* 1172 * Strip out IP options, at higher 1173 * level protocol in the kernel. 1174 * Second argument is buffer to which options 1175 * will be moved, and return value is their length. 1176 * XXX should be deleted; last arg currently ignored. 1177 */ 1178void 1179ip_stripoptions(m, mopt) 1180 register struct mbuf *m; 1181 struct mbuf *mopt; 1182{ 1183 register int i; 1184 struct ip *ip = mtod(m, struct ip *); 1185 register caddr_t opts; 1186 int olen; 1187 1188 olen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); 1189 opts = (caddr_t)(ip + 1); 1190 i = m->m_len - (sizeof (struct ip) + olen); 1191 bcopy(opts + olen, opts, (unsigned)i); 1192 m->m_len -= olen; 1193 if (m->m_flags & M_PKTHDR) 1194 m->m_pkthdr.len -= olen; 1195 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2); 1196} 1197 1198u_char inetctlerrmap[PRC_NCMDS] = { 1199 0, 0, 0, 0, 1200 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1201 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1202 EMSGSIZE, EHOSTUNREACH, 0, 0, 1203 0, 0, 0, 0, 1204 ENOPROTOOPT 1205}; 1206 1207/* 1208 * Forward a packet. If some error occurs return the sender 1209 * an icmp packet. Note we can't always generate a meaningful 1210 * icmp message because icmp doesn't have a large enough repertoire 1211 * of codes and types. 1212 * 1213 * If not forwarding, just drop the packet. This could be confusing 1214 * if ipforwarding was zero but some routing protocol was advancing 1215 * us as a gateway to somewhere. However, we must let the routing 1216 * protocol deal with that. 1217 * 1218 * The srcrt parameter indicates whether the packet is being forwarded 1219 * via a source route. 1220 */ 1221static void 1222ip_forward(m, srcrt) 1223 struct mbuf *m; 1224 int srcrt; 1225{ 1226 register struct ip *ip = mtod(m, struct ip *); 1227 register struct sockaddr_in *sin; 1228 register struct rtentry *rt; 1229 int error, type = 0, code = 0; 1230 struct mbuf *mcopy; 1231 n_long dest; 1232 struct ifnet *destifp; 1233 1234 dest = 0; 1235#ifdef DIAGNOSTIC 1236 if (ipprintfs) 1237 printf("forward: src %lx dst %lx ttl %x\n", 1238 ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl); 1239#endif 1240 1241 1242 if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) { 1243 ipstat.ips_cantforward++; 1244 m_freem(m); 1245 return; 1246 } 1247 HTONS(ip->ip_id); 1248 if (ip->ip_ttl <= IPTTLDEC) { 1249 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1250 return; 1251 } 1252 ip->ip_ttl -= IPTTLDEC; 1253 1254 sin = (struct sockaddr_in *)&ipforward_rt.ro_dst; 1255 if ((rt = ipforward_rt.ro_rt) == 0 || 1256 ip->ip_dst.s_addr != sin->sin_addr.s_addr) { 1257 if (ipforward_rt.ro_rt) { 1258 RTFREE(ipforward_rt.ro_rt); 1259 ipforward_rt.ro_rt = 0; 1260 } 1261 sin->sin_family = AF_INET; 1262 sin->sin_len = sizeof(*sin); 1263 sin->sin_addr = ip->ip_dst; 1264 1265 rtalloc_ign(&ipforward_rt, RTF_PRCLONING); 1266 if (ipforward_rt.ro_rt == 0) { 1267 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0); 1268 return; 1269 } 1270 rt = ipforward_rt.ro_rt; 1271 } 1272 1273 /* 1274 * Save at most 64 bytes of the packet in case 1275 * we need to generate an ICMP message to the src. 1276 */ 1277 mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64)); 1278 1279 /* 1280 * If forwarding packet using same interface that it came in on, 1281 * perhaps should send a redirect to sender to shortcut a hop. 1282 * Only send redirect if source is sending directly to us, 1283 * and if packet was not source routed (or has any options). 1284 * Also, don't send redirect if forwarding using a default route 1285 * or a route modified by a redirect. 1286 */ 1287#define satosin(sa) ((struct sockaddr_in *)(sa)) 1288 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1289 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1290 satosin(rt_key(rt))->sin_addr.s_addr != 0 && 1291 ipsendredirects && !srcrt) { 1292#define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa)) 1293 u_long src = ntohl(ip->ip_src.s_addr); 1294 1295 if (RTA(rt) && 1296 (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) { 1297 if (rt->rt_flags & RTF_GATEWAY) 1298 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1299 else 1300 dest = ip->ip_dst.s_addr; 1301 /* Router requirements says to only send host redirects */ 1302 type = ICMP_REDIRECT; 1303 code = ICMP_REDIRECT_HOST; 1304#ifdef DIAGNOSTIC 1305 if (ipprintfs) 1306 printf("redirect (%d) to %lx\n", code, (u_long)dest); 1307#endif 1308 } 1309 } 1310 1311 error = ip_output(m, (struct mbuf *)0, &ipforward_rt, 1312 IP_FORWARDING, 0); 1313 if (error) 1314 ipstat.ips_cantforward++; 1315 else { 1316 ipstat.ips_forward++; 1317 if (type) 1318 ipstat.ips_redirectsent++; 1319 else { 1320 if (mcopy) 1321 m_freem(mcopy); 1322 return; 1323 } 1324 } 1325 if (mcopy == NULL) 1326 return; 1327 destifp = NULL; 1328 1329 switch (error) { 1330 1331 case 0: /* forwarded, but need redirect */ 1332 /* type, code set above */ 1333 break; 1334 1335 case ENETUNREACH: /* shouldn't happen, checked above */ 1336 case EHOSTUNREACH: 1337 case ENETDOWN: 1338 case EHOSTDOWN: 1339 default: 1340 type = ICMP_UNREACH; 1341 code = ICMP_UNREACH_HOST; 1342 break; 1343 1344 case EMSGSIZE: 1345 type = ICMP_UNREACH; 1346 code = ICMP_UNREACH_NEEDFRAG; 1347 if (ipforward_rt.ro_rt) 1348 destifp = ipforward_rt.ro_rt->rt_ifp; 1349 ipstat.ips_cantfrag++; 1350 break; 1351 1352 case ENOBUFS: 1353 type = ICMP_SOURCEQUENCH; 1354 code = 0; 1355 break; 1356 } 1357 icmp_error(mcopy, type, code, dest, destifp); 1358} 1359 1360void 1361ip_savecontrol(inp, mp, ip, m) 1362 register struct inpcb *inp; 1363 register struct mbuf **mp; 1364 register struct ip *ip; 1365 register struct mbuf *m; 1366{ 1367 if (inp->inp_socket->so_options & SO_TIMESTAMP) { 1368 struct timeval tv; 1369 1370 microtime(&tv); 1371 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1372 SCM_TIMESTAMP, SOL_SOCKET); 1373 if (*mp) 1374 mp = &(*mp)->m_next; 1375 } 1376 if (inp->inp_flags & INP_RECVDSTADDR) { 1377 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst, 1378 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1379 if (*mp) 1380 mp = &(*mp)->m_next; 1381 } 1382#ifdef notyet 1383 /* XXX 1384 * Moving these out of udp_input() made them even more broken 1385 * than they already were. 1386 */ 1387 /* options were tossed already */ 1388 if (inp->inp_flags & INP_RECVOPTS) { 1389 *mp = sbcreatecontrol((caddr_t) opts_deleted_above, 1390 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1391 if (*mp) 1392 mp = &(*mp)->m_next; 1393 } 1394 /* ip_srcroute doesn't do what we want here, need to fix */ 1395 if (inp->inp_flags & INP_RECVRETOPTS) { 1396 *mp = sbcreatecontrol((caddr_t) ip_srcroute(), 1397 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1398 if (*mp) 1399 mp = &(*mp)->m_next; 1400 } 1401#endif 1402 if (inp->inp_flags & INP_RECVIF) { 1403 struct sockaddr_dl sdl; 1404 1405 sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]); 1406 sdl.sdl_family = AF_LINK; 1407 sdl.sdl_index = m->m_pkthdr.rcvif ? 1408 m->m_pkthdr.rcvif->if_index : 0; 1409 sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0; 1410 *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len, 1411 IP_RECVIF, IPPROTO_IP); 1412 if (*mp) 1413 mp = &(*mp)->m_next; 1414 } 1415} 1416 1417int 1418ip_rsvp_init(struct socket *so) 1419{ 1420 if (so->so_type != SOCK_RAW || 1421 so->so_proto->pr_protocol != IPPROTO_RSVP) 1422 return EOPNOTSUPP; 1423 1424 if (ip_rsvpd != NULL) 1425 return EADDRINUSE; 1426 1427 ip_rsvpd = so; 1428 /* 1429 * This may seem silly, but we need to be sure we don't over-increment 1430 * the RSVP counter, in case something slips up. 1431 */ 1432 if (!ip_rsvp_on) { 1433 ip_rsvp_on = 1; 1434 rsvp_on++; 1435 } 1436 1437 return 0; 1438} 1439 1440int 1441ip_rsvp_done(void) 1442{ 1443 ip_rsvpd = NULL; 1444 /* 1445 * This may seem silly, but we need to be sure we don't over-decrement 1446 * the RSVP counter, in case something slips up. 1447 */ 1448 if (ip_rsvp_on) { 1449 ip_rsvp_on = 0; 1450 rsvp_on--; 1451 } 1452 return 0; 1453} 1454