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 1.52 1996/12/11 03:26:36 davidg 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 78 int rsvp_on = 0; 79 static int ip_rsvp_on; 80 struct socket *ip_rsvpd; 81 82 static int ipforwarding = 0; 83 SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_RW, 84 &ipforwarding, 0, ""); 85 86 static int ipsendredirects = 1; /* XXX */ 87 SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW, 88 &ipsendredirects, 0, ""); 89 90 int ip_defttl = IPDEFTTL; 91 SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW, 92 &ip_defttl, 0, ""); 93 94 static int ip_dosourceroute = 0; 95 SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW, 96 &ip_dosourceroute, 0, ""); 97 #ifdef DIAGNOSTIC 98 static int ipprintfs = 0; 99 #endif 100 101 extern struct domain inetdomain; 102 extern struct protosw inetsw[]; 103 u_char ip_protox[IPPROTO_MAX]; 104 static int ipqmaxlen = IFQ_MAXLEN; 105 struct in_ifaddrhead in_ifaddrhead; /* first inet address */ 106 struct ifqueue ipintrq; 107 SYSCTL_INT(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, CTLFLAG_RD, 108 &ipintrq.ifq_maxlen, 0, ""); 109 SYSCTL_INT(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, CTLFLAG_RD, 110 &ipintrq.ifq_drops, 0, ""); 111 112 struct ipstat ipstat; 113 static struct ipq ipq; 114 115 #ifdef IPCTL_DEFMTU 116 SYSCTL_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 */ 129 ip_fw_chk_t *ip_fw_chk_ptr; 130 ip_fw_ctl_t *ip_fw_ctl_ptr; 131 132 /* IP Network Address Translation (NAT) hooks */ 133 ip_nat_t *ip_nat_ptr; 134 ip_nat_ctl_t *ip_nat_ctl_ptr; 135 #endif 136 137 /* 138 * We need to save the IP options in case a protocol wants to respond 139 * to an incoming packet over the same route if the packet got here 140 * using IP source routing. This allows connection establishment and 141 * maintenance when the remote end is on a network that is not known 142 * to us. 143 */ 144 static int ip_nhops = 0; 145 static struct ip_srcrt { 146 struct in_addr dst; /* final destination */ 147 char nop; /* one NOP to align */ 148 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ 149 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; 150 } ip_srcrt; 151 152 #ifdef IPDIVERT 153 /* 154 * Shared variable between ip_input() and ip_reass() to communicate 155 * about which packets, once assembled from fragments, get diverted, 156 * and to which port. 157 */ 158 static u_short frag_divert_port; 159 #endif 160 161 static void save_rte __P((u_char *, struct in_addr)); 162 static void ip_deq __P((struct ipasfrag *)); 163 static int ip_dooptions __P((struct mbuf *)); 164 static void ip_enq __P((struct ipasfrag *, struct ipasfrag *)); 165 static void ip_forward __P((struct mbuf *, int)); 166 static void ip_freef __P((struct ipq *)); 167 static struct ip * 168 ip_reass __P((struct ipasfrag *, struct ipq *)); 169 static struct in_ifaddr * 170 ip_rtaddr __P((struct in_addr)); 171 static void ipintr __P((void)); 172 /* 173 * IP initialization: fill in IP protocol switch table. 174 * All protocols not implemented in kernel go to raw IP protocol handler. 175 */ 176 void 177 ip_init() 178 { 179 register struct protosw *pr; 180 register int i; 181 182 TAILQ_INIT(&in_ifaddrhead); 183 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); 184 if (pr == 0) 185 panic("ip_init"); 186 for (i = 0; i < IPPROTO_MAX; i++) 187 ip_protox[i] = pr - inetsw; 188 for (pr = inetdomain.dom_protosw; 189 pr < inetdomain.dom_protoswNPROTOSW; pr++) 190 if (pr->pr_domain->dom_family == PF_INET && 191 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 192 ip_protox[pr->pr_protocol] = pr - inetsw; 193 ipq.next = ipq.prev = &ipq; 194 ip_id = time.tv_sec & 0xffff; 195 ipintrq.ifq_maxlen = ipqmaxlen; 196 #ifdef IPFIREWALL 197 ip_fw_init(); 198 #endif 199 #ifdef IPNAT 200 ip_nat_init(); 201 #endif 202 203 } 204 205 static struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; 206 static struct route ipforward_rt; 207 208 /* 209 * Ip input routine. Checksum and byte swap header. If fragmented 210 * try to reassemble. Process options. Pass to next level. 211 */ 212 void 213 ip_input(struct mbuf *m) 214 { 215 struct ip *ip; 216 struct ipq *fp; 217 struct in_ifaddr *ia; 218 int hlen; 219 220 #ifdef DIAGNOSTIC 221 if ((m->m_flags & M_PKTHDR) == 0) 222 panic("ip_input no HDR"); 223 #endif 224 /* 225 * If no IP addresses have been set yet but the interfaces 226 * are receiving, can't do anything with incoming packets yet. 227 * XXX This is broken! We should be able to receive broadcasts 228 * and multicasts even without any local addresses configured. 229 */ 230 if (TAILQ_EMPTY(&in_ifaddrhead)) 231 goto bad; 232 ipstat.ips_total++; 233 234 if (m->m_pkthdr.len < sizeof(struct ip)) 235 goto tooshort; 236 237 #ifdef DIAGNOSTIC 238 if (m->m_len < sizeof(struct ip)) 239 panic("ipintr mbuf too short"); 240 #endif 241 242 if (m->m_len < sizeof (struct ip) && 243 (m = m_pullup(m, sizeof (struct ip))) == 0) { 244 ipstat.ips_toosmall++; 245 return; 246 } 247 ip = mtod(m, struct ip *); 248 249 if (IP_VHL_V(ip->ip_vhl) != IPVERSION) { 250 ipstat.ips_badvers++; 251 goto bad; 252 } 253 254 hlen = IP_VHL_HL(ip->ip_vhl) << 2; 255 if (hlen < sizeof(struct ip)) { /* minimum header length */ 256 ipstat.ips_badhlen++; 257 goto bad; 258 } 259 if (hlen > m->m_len) { 260 if ((m = m_pullup(m, hlen)) == 0) { 261 ipstat.ips_badhlen++; 262 return; 263 } 264 ip = mtod(m, struct ip *); 265 } 266 if (hlen == sizeof(struct ip)) { 267 ip->ip_sum = in_cksum_hdr(ip); 268 } else { 269 ip->ip_sum = in_cksum(m, hlen); 270 } 271 if (ip->ip_sum) { 272 ipstat.ips_badsum++; 273 goto bad; 274 } 275 276 /* 277 * Convert fields to host representation. 278 */ 279 NTOHS(ip->ip_len); 280 if (ip->ip_len < hlen) { 281 ipstat.ips_badlen++; 282 goto bad; 283 } 284 NTOHS(ip->ip_id); 285 NTOHS(ip->ip_off); 286 287 /* 288 * Check that the amount of data in the buffers 289 * is as at least much as the IP header would have us expect. 290 * Trim mbufs if longer than we expect. 291 * Drop packet if shorter than we expect. 292 */ 293 if (m->m_pkthdr.len < ip->ip_len) { 294 tooshort: 295 ipstat.ips_tooshort++; 296 goto bad; 297 } 298 if (m->m_pkthdr.len > ip->ip_len) { 299 if (m->m_len == m->m_pkthdr.len) { 300 m->m_len = ip->ip_len; 301 m->m_pkthdr.len = ip->ip_len; 302 } else 303 m_adj(m, ip->ip_len - m->m_pkthdr.len); 304 } 305 /* 306 * IpHack's section. 307 * Right now when no processing on packet has done 308 * and it is still fresh out of network we do our black 309 * deals with it. 310 * - Firewall: deny/allow/divert 311 * - Xlate: translate packet's addr/port (NAT). 312 * - Wrap: fake packet's addr/port <unimpl.> 313 * - Encapsulate: put it in another IP and send out. <unimp.> 314 */ 315 316 #ifdef COMPAT_IPFW 317 if (ip_fw_chk_ptr) { 318 int action; 319 320 #ifdef IPDIVERT 321 action = (*ip_fw_chk_ptr)(&ip, hlen, 322 m->m_pkthdr.rcvif, ip_divert_ignore, &m); 323 #else 324 action = (*ip_fw_chk_ptr)(&ip, hlen, m->m_pkthdr.rcvif, 0, &m); 325 #endif 326 if (action == -1) 327 return; 328 if (action != 0) { 329 #ifdef IPDIVERT 330 frag_divert_port = action; 331 goto ours; 332 #else 333 goto bad; /* ipfw said divert but we can't */ 334 #endif 335 } 336 } 337 338 if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, m->m_pkthdr.rcvif, IP_NAT_IN)) 339 return; 340 #endif 341 342 /* 343 * Process options and, if not destined for us, 344 * ship it on. ip_dooptions returns 1 when an 345 * error was detected (causing an icmp message 346 * to be sent and the original packet to be freed). 347 */ 348 ip_nhops = 0; /* for source routed packets */ 349 if (hlen > sizeof (struct ip) && ip_dooptions(m)) 350 return; 351 352 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 353 * matter if it is destined to another node, or whether it is 354 * a multicast one, RSVP wants it! and prevents it from being forwarded 355 * anywhere else. Also checks if the rsvp daemon is running before 356 * grabbing the packet. 357 */ 358 if (rsvp_on && ip->ip_p==IPPROTO_RSVP) 359 goto ours; 360 361 /* 362 * Check our list of addresses, to see if the packet is for us. 363 */ 364 for (ia = in_ifaddrhead.tqh_first; ia; ia = ia->ia_link.tqe_next) { 365 #define satosin(sa) ((struct sockaddr_in *)(sa)) 366 367 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr) 368 goto ours; 369 if (ia->ia_ifp && ia->ia_ifp->if_flags & IFF_BROADCAST) { 370 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 371 ip->ip_dst.s_addr) 372 goto ours; 373 if (ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr) 374 goto ours; 375 } 376 } 377 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 378 struct in_multi *inm; 379 if (ip_mrouter) { 380 /* 381 * If we are acting as a multicast router, all 382 * incoming multicast packets are passed to the 383 * kernel-level multicast forwarding function. 384 * The packet is returned (relatively) intact; if 385 * ip_mforward() returns a non-zero value, the packet 386 * must be discarded, else it may be accepted below. 387 * 388 * (The IP ident field is put in the same byte order 389 * as expected when ip_mforward() is called from 390 * ip_output().) 391 */ 392 ip->ip_id = htons(ip->ip_id); 393 if (ip_mforward(ip, m->m_pkthdr.rcvif, m, 0) != 0) { 394 ipstat.ips_cantforward++; 395 m_freem(m); 396 return; 397 } 398 ip->ip_id = ntohs(ip->ip_id); 399 400 /* 401 * The process-level routing demon needs to receive 402 * all multicast IGMP packets, whether or not this 403 * host belongs to their destination groups. 404 */ 405 if (ip->ip_p == IPPROTO_IGMP) 406 goto ours; 407 ipstat.ips_forward++; 408 } 409 /* 410 * See if we belong to the destination multicast group on the 411 * arrival interface. 412 */ 413 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); 414 if (inm == NULL) { 415 ipstat.ips_cantforward++; 416 m_freem(m); 417 return; 418 } 419 goto ours; 420 } 421 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 422 goto ours; 423 if (ip->ip_dst.s_addr == INADDR_ANY) 424 goto ours; 425 426 /* 427 * Not for us; forward if possible and desirable. 428 */ 429 if (ipforwarding == 0) { 430 ipstat.ips_cantforward++; 431 m_freem(m); 432 } else 433 ip_forward(m, 0); 434 return; 435 436 ours: 437 438 /* 439 * If offset or IP_MF are set, must reassemble. 440 * Otherwise, nothing need be done. 441 * (We could look in the reassembly queue to see 442 * if the packet was previously fragmented, 443 * but it's not worth the time; just let them time out.) 444 */ 445 if (ip->ip_off & (IP_MF | IP_OFFMASK)) { 446 if (m->m_flags & M_EXT) { /* XXX */ 447 if ((m = m_pullup(m, sizeof (struct ip))) == 0) { 448 ipstat.ips_toosmall++; 449 #ifdef IPDIVERT 450 frag_divert_port = 0; 451 #endif 452 return; 453 } 454 ip = mtod(m, struct ip *); 455 } 456 /* 457 * Look for queue of fragments 458 * of this datagram. 459 */ 460 for (fp = ipq.next; fp != &ipq; fp = fp->next) 461 if (ip->ip_id == fp->ipq_id && 462 ip->ip_src.s_addr == fp->ipq_src.s_addr && 463 ip->ip_dst.s_addr == fp->ipq_dst.s_addr && 464 ip->ip_p == fp->ipq_p) 465 goto found; 466 fp = 0; 467 found: 468 469 /* 470 * Adjust ip_len to not reflect header, 471 * set ip_mff if more fragments are expected, 472 * convert offset of this to bytes. 473 */ 474 ip->ip_len -= hlen; 475 ((struct ipasfrag *)ip)->ipf_mff &= ~1; 476 if (ip->ip_off & IP_MF) 477 ((struct ipasfrag *)ip)->ipf_mff |= 1; 478 ip->ip_off <<= 3; 479 480 /* 481 * If datagram marked as having more fragments 482 * or if this is not the first fragment, 483 * attempt reassembly; if it succeeds, proceed. 484 */ 485 if (((struct ipasfrag *)ip)->ipf_mff & 1 || ip->ip_off) { 486 ipstat.ips_fragments++; 487 ip = ip_reass((struct ipasfrag *)ip, fp); 488 if (ip == 0) 489 return; 490 ipstat.ips_reassembled++; 491 m = dtom(ip); 492 } else 493 if (fp) 494 ip_freef(fp); 495 } else 496 ip->ip_len -= hlen; 497 498 #ifdef IPDIVERT 499 /* 500 * Divert packets here to the divert protocol if required 501 */ 502 if (frag_divert_port) { 503 ip_divert_port = frag_divert_port; 504 frag_divert_port = 0; 505 (*inetsw[ip_protox[IPPROTO_DIVERT]].pr_input)(m, hlen); 506 return; 507 } 508 #endif 509 510 /* 511 * Switch out to protocol's input routine. 512 */ 513 ipstat.ips_delivered++; 514 (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen); 515 return; 516 bad: 517 m_freem(m); 518 } 519 520 /* 521 * IP software interrupt routine - to go away sometime soon 522 */ 523 static void 524 ipintr(void) 525 { 526 int s; 527 struct mbuf *m; 528 529 while(1) { 530 s = splimp(); 531 IF_DEQUEUE(&ipintrq, m); 532 splx(s); 533 if (m == 0) 534 return; 535 ip_input(m); 536 } 537 } 538 539 NETISR_SET(NETISR_IP, ipintr); 540 541 /* 542 * Take incoming datagram fragment and try to 543 * reassemble it into whole datagram. If a chain for 544 * reassembly of this datagram already exists, then it 545 * is given as fp; otherwise have to make a chain. 546 */ 547 static struct ip * 548 ip_reass(ip, fp) 549 register struct ipasfrag *ip; 550 register struct ipq *fp; 551 { 552 register struct mbuf *m = dtom(ip); 553 register struct ipasfrag *q; 554 struct mbuf *t; 555 int hlen = ip->ip_hl << 2; 556 int i, next; 557 558 /* 559 * Presence of header sizes in mbufs 560 * would confuse code below. 561 */ 562 m->m_data += hlen; 563 m->m_len -= hlen; 564 565 /* 566 * If first fragment to arrive, create a reassembly queue. 567 */ 568 if (fp == 0) { 569 if ((t = m_get(M_DONTWAIT, MT_FTABLE)) == NULL) 570 goto dropfrag; 571 fp = mtod(t, struct ipq *); 572 insque(fp, &ipq); 573 fp->ipq_ttl = IPFRAGTTL; 574 fp->ipq_p = ip->ip_p; 575 fp->ipq_id = ip->ip_id; 576 fp->ipq_next = fp->ipq_prev = (struct ipasfrag *)fp; 577 fp->ipq_src = ((struct ip *)ip)->ip_src; 578 fp->ipq_dst = ((struct ip *)ip)->ip_dst; 579 #ifdef IPDIVERT 580 fp->ipq_divert = 0; 581 #endif 582 q = (struct ipasfrag *)fp; 583 goto insert; 584 } 585 586 /* 587 * Find a segment which begins after this one does. 588 */ 589 for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) 590 if (q->ip_off > ip->ip_off) 591 break; 592 593 /* 594 * If there is a preceding segment, it may provide some of 595 * our data already. If so, drop the data from the incoming 596 * segment. If it provides all of our data, drop us. 597 */ 598 if (q->ipf_prev != (struct ipasfrag *)fp) { 599 i = q->ipf_prev->ip_off + q->ipf_prev->ip_len - ip->ip_off; 600 if (i > 0) { 601 if (i >= ip->ip_len) 602 goto dropfrag; 603 m_adj(dtom(ip), i); 604 ip->ip_off += i; 605 ip->ip_len -= i; 606 } 607 } 608 609 /* 610 * While we overlap succeeding segments trim them or, 611 * if they are completely covered, dequeue them. 612 */ 613 while (q != (struct ipasfrag *)fp && ip->ip_off + ip->ip_len > q->ip_off) { 614 struct mbuf *m0; 615 616 i = (ip->ip_off + ip->ip_len) - q->ip_off; 617 if (i < q->ip_len) { 618 q->ip_len -= i; 619 q->ip_off += i; 620 m_adj(dtom(q), i); 621 break; 622 } 623 m0 = dtom(q); 624 q = q->ipf_next; 625 ip_deq(q->ipf_prev); 626 m_freem(m0); 627 } 628 629 insert: 630 631 #ifdef IPDIVERT 632 /* 633 * Any fragment diverting causes the whole packet to divert 634 */ 635 if (frag_divert_port != 0) 636 fp->ipq_divert = frag_divert_port; 637 frag_divert_port = 0; 638 #endif 639 640 /* 641 * Stick new segment in its place; 642 * check for complete reassembly. 643 */ 644 ip_enq(ip, q->ipf_prev); 645 next = 0; 646 for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = q->ipf_next) { 647 if (q->ip_off != next) 648 return (0); 649 next += q->ip_len; 650 } 651 if (q->ipf_prev->ipf_mff & 1) 652 return (0); 653 654 /* 655 * Reassembly is complete. Make sure the packet is a sane size. 656 */ 657 if (next + (IP_VHL_HL(((struct ip *)fp->ipq_next)->ip_vhl) << 2) 658 > IP_MAXPACKET) { 659 ipstat.ips_toolong++; 660 ip_freef(fp); 661 return (0); 662 } 663 664 /* 665 * Concatenate fragments. 666 */ 667 q = fp->ipq_next; 668 m = dtom(q); 669 t = m->m_next; 670 m->m_next = 0; 671 m_cat(m, t); 672 q = q->ipf_next; 673 while (q != (struct ipasfrag *)fp) { 674 t = dtom(q); 675 q = q->ipf_next; 676 m_cat(m, t); 677 } 678 679 #ifdef IPDIVERT 680 /* 681 * Record divert port for packet, if any 682 */ 683 frag_divert_port = fp->ipq_divert; 684 #endif 685 686 /* 687 * Create header for new ip packet by 688 * modifying header of first packet; 689 * dequeue and discard fragment reassembly header. 690 * Make header visible. 691 */ 692 ip = fp->ipq_next; 693 ip->ip_len = next; 694 ip->ipf_mff &= ~1; 695 ((struct ip *)ip)->ip_src = fp->ipq_src; 696 ((struct ip *)ip)->ip_dst = fp->ipq_dst; 697 remque(fp); 698 (void) m_free(dtom(fp)); 699 m = dtom(ip); 700 m->m_len += (ip->ip_hl << 2); 701 m->m_data -= (ip->ip_hl << 2); 702 /* some debugging cruft by sklower, below, will go away soon */ 703 if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */ 704 register int plen = 0; 705 for (t = m; m; m = m->m_next) 706 plen += m->m_len; 707 t->m_pkthdr.len = plen; 708 } 709 return ((struct ip *)ip); 710 711 dropfrag: 712 ipstat.ips_fragdropped++; 713 m_freem(m); 714 return (0); 715 } 716 717 /* 718 * Free a fragment reassembly header and all 719 * associated datagrams. 720 */ 721 static void 722 ip_freef(fp) 723 struct ipq *fp; 724 { 725 register struct ipasfrag *q, *p; 726 727 for (q = fp->ipq_next; q != (struct ipasfrag *)fp; q = p) { 728 p = q->ipf_next; 729 ip_deq(q); 730 m_freem(dtom(q)); 731 } 732 remque(fp); 733 (void) m_free(dtom(fp)); 734 } 735 736 /* 737 * Put an ip fragment on a reassembly chain. 738 * Like insque, but pointers in middle of structure. 739 */ 740 static void 741 ip_enq(p, prev) 742 register struct ipasfrag *p, *prev; 743 { 744 745 p->ipf_prev = prev; 746 p->ipf_next = prev->ipf_next; 747 prev->ipf_next->ipf_prev = p; 748 prev->ipf_next = p; 749 } 750 751 /* 752 * To ip_enq as remque is to insque. 753 */ 754 static void 755 ip_deq(p) 756 register struct ipasfrag *p; 757 { 758 759 p->ipf_prev->ipf_next = p->ipf_next; 760 p->ipf_next->ipf_prev = p->ipf_prev; 761 } 762 763 /* 764 * IP timer processing; 765 * if a timer expires on a reassembly 766 * queue, discard it. 767 */ 768 void 769 ip_slowtimo() 770 { 771 register struct ipq *fp; 772 int s = splnet(); 773 774 fp = ipq.next; 775 if (fp == 0) { 776 splx(s); 777 return; 778 } 779 while (fp != &ipq) { 780 --fp->ipq_ttl; 781 fp = fp->next; 782 if (fp->prev->ipq_ttl == 0) { 783 ipstat.ips_fragtimeout++; 784 ip_freef(fp->prev); 785 } 786 } 787 splx(s); 788 } 789 790 /* 791 * Drain off all datagram fragments. 792 */ 793 void 794 ip_drain() 795 { 796 while (ipq.next != &ipq) { 797 ipstat.ips_fragdropped++; 798 ip_freef(ipq.next); 799 } 800 801 in_rtqdrain(); 802 } 803 804 /* 805 * Do option processing on a datagram, 806 * possibly discarding it if bad options are encountered, 807 * or forwarding it if source-routed. 808 * Returns 1 if packet has been forwarded/freed, 809 * 0 if the packet should be processed further. 810 */ 811 static int 812 ip_dooptions(m) 813 struct mbuf *m; 814 { 815 register struct ip *ip = mtod(m, struct ip *); 816 register u_char *cp; 817 register struct ip_timestamp *ipt; 818 register struct in_ifaddr *ia; 819 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; 820 struct in_addr *sin, dst; 821 n_time ntime; 822 823 dst = ip->ip_dst; 824 cp = (u_char *)(ip + 1); 825 cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); 826 for (; cnt > 0; cnt -= optlen, cp += optlen) { 827 opt = cp[IPOPT_OPTVAL]; 828 if (opt == IPOPT_EOL) 829 break; 830 if (opt == IPOPT_NOP) 831 optlen = 1; 832 else { 833 optlen = cp[IPOPT_OLEN]; 834 if (optlen <= 0 || optlen > cnt) { 835 code = &cp[IPOPT_OLEN] - (u_char *)ip; 836 goto bad; 837 } 838 } 839 switch (opt) { 840 841 default: 842 break; 843 844 /* 845 * Source routing with record. 846 * Find interface with current destination address. 847 * If none on this machine then drop if strictly routed, 848 * or do nothing if loosely routed. 849 * Record interface address and bring up next address 850 * component. If strictly routed make sure next 851 * address is on directly accessible net. 852 */ 853 case IPOPT_LSRR: 854 case IPOPT_SSRR: 855 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 856 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 857 goto bad; 858 } 859 ipaddr.sin_addr = ip->ip_dst; 860 ia = (struct in_ifaddr *) 861 ifa_ifwithaddr((struct sockaddr *)&ipaddr); 862 if (ia == 0) { 863 if (opt == IPOPT_SSRR) { 864 type = ICMP_UNREACH; 865 code = ICMP_UNREACH_SRCFAIL; 866 goto bad; 867 } 868 /* 869 * Loose routing, and not at next destination 870 * yet; nothing to do except forward. 871 */ 872 break; 873 } 874 off--; /* 0 origin */ 875 if (off > optlen - sizeof(struct in_addr)) { 876 /* 877 * End of source route. Should be for us. 878 */ 879 save_rte(cp, ip->ip_src); 880 break; 881 } 882 883 if (!ip_dosourceroute) { 884 char buf[4*sizeof "123"]; 885 strcpy(buf, inet_ntoa(ip->ip_dst)); 886 887 log(LOG_WARNING, 888 "attempted source route from %s to %s\n", 889 inet_ntoa(ip->ip_src), buf); 890 type = ICMP_UNREACH; 891 code = ICMP_UNREACH_SRCFAIL; 892 goto bad; 893 } 894 895 /* 896 * locate outgoing interface 897 */ 898 (void)memcpy(&ipaddr.sin_addr, cp + off, 899 sizeof(ipaddr.sin_addr)); 900 901 if (opt == IPOPT_SSRR) { 902 #define INA struct in_ifaddr * 903 #define SA struct sockaddr * 904 if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) 905 ia = (INA)ifa_ifwithnet((SA)&ipaddr); 906 } else 907 ia = ip_rtaddr(ipaddr.sin_addr); 908 if (ia == 0) { 909 type = ICMP_UNREACH; 910 code = ICMP_UNREACH_SRCFAIL; 911 goto bad; 912 } 913 ip->ip_dst = ipaddr.sin_addr; 914 (void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr), 915 sizeof(struct in_addr)); 916 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 917 /* 918 * Let ip_intr's mcast routing check handle mcast pkts 919 */ 920 forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr)); 921 break; 922 923 case IPOPT_RR: 924 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { 925 code = &cp[IPOPT_OFFSET] - (u_char *)ip; 926 goto bad; 927 } 928 /* 929 * If no space remains, ignore. 930 */ 931 off--; /* 0 origin */ 932 if (off > optlen - sizeof(struct in_addr)) 933 break; 934 (void)memcpy(&ipaddr.sin_addr, &ip->ip_dst, 935 sizeof(ipaddr.sin_addr)); 936 /* 937 * locate outgoing interface; if we're the destination, 938 * use the incoming interface (should be same). 939 */ 940 if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 && 941 (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) { 942 type = ICMP_UNREACH; 943 code = ICMP_UNREACH_HOST; 944 goto bad; 945 } 946 (void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr), 947 sizeof(struct in_addr)); 948 cp[IPOPT_OFFSET] += sizeof(struct in_addr); 949 break; 950 951 case IPOPT_TS: 952 code = cp - (u_char *)ip; 953 ipt = (struct ip_timestamp *)cp; 954 if (ipt->ipt_len < 5) 955 goto bad; 956 if (ipt->ipt_ptr > ipt->ipt_len - sizeof (long)) { 957 if (++ipt->ipt_oflw == 0) 958 goto bad; 959 break; 960 } 961 sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1); 962 switch (ipt->ipt_flg) { 963 964 case IPOPT_TS_TSONLY: 965 break; 966 967 case IPOPT_TS_TSANDADDR: 968 if (ipt->ipt_ptr + sizeof(n_time) + 969 sizeof(struct in_addr) > ipt->ipt_len) 970 goto bad; 971 ipaddr.sin_addr = dst; 972 ia = (INA)ifaof_ifpforaddr((SA)&ipaddr, 973 m->m_pkthdr.rcvif); 974 if (ia == 0) 975 continue; 976 (void)memcpy(sin, &IA_SIN(ia)->sin_addr, 977 sizeof(struct in_addr)); 978 ipt->ipt_ptr += sizeof(struct in_addr); 979 break; 980 981 case IPOPT_TS_PRESPEC: 982 if (ipt->ipt_ptr + sizeof(n_time) + 983 sizeof(struct in_addr) > ipt->ipt_len) 984 goto bad; 985 (void)memcpy(&ipaddr.sin_addr, sin, 986 sizeof(struct in_addr)); 987 if (ifa_ifwithaddr((SA)&ipaddr) == 0) 988 continue; 989 ipt->ipt_ptr += sizeof(struct in_addr); 990 break; 991 992 default: 993 goto bad; 994 } 995 ntime = iptime(); 996 (void)memcpy(cp + ipt->ipt_ptr - 1, &ntime, 997 sizeof(n_time)); 998 ipt->ipt_ptr += sizeof(n_time); 999 } 1000 } 1001 if (forward) { 1002 ip_forward(m, 1); 1003 return (1); 1004 } 1005 return (0); 1006 bad: 1007 ip->ip_len -= IP_VHL_HL(ip->ip_vhl) << 2; /* XXX icmp_error adds in hdr length */ 1008 icmp_error(m, type, code, 0, 0); 1009 ipstat.ips_badoptions++; 1010 return (1); 1011 } 1012 1013 /* 1014 * Given address of next destination (final or next hop), 1015 * return internet address info of interface to be used to get there. 1016 */ 1017 static struct in_ifaddr * 1018 ip_rtaddr(dst) 1019 struct in_addr dst; 1020 { 1021 register struct sockaddr_in *sin; 1022 1023 sin = (struct sockaddr_in *) &ipforward_rt.ro_dst; 1024 1025 if (ipforward_rt.ro_rt == 0 || dst.s_addr != sin->sin_addr.s_addr) { 1026 if (ipforward_rt.ro_rt) { 1027 RTFREE(ipforward_rt.ro_rt); 1028 ipforward_rt.ro_rt = 0; 1029 } 1030 sin->sin_family = AF_INET; 1031 sin->sin_len = sizeof(*sin); 1032 sin->sin_addr = dst; 1033 1034 rtalloc_ign(&ipforward_rt, RTF_PRCLONING); 1035 } 1036 if (ipforward_rt.ro_rt == 0) 1037 return ((struct in_ifaddr *)0); 1038 return ((struct in_ifaddr *) ipforward_rt.ro_rt->rt_ifa); 1039 } 1040 1041 /* 1042 * Save incoming source route for use in replies, 1043 * to be picked up later by ip_srcroute if the receiver is interested. 1044 */ 1045 void 1046 save_rte(option, dst) 1047 u_char *option; 1048 struct in_addr dst; 1049 { 1050 unsigned olen; 1051 1052 olen = option[IPOPT_OLEN]; 1053 #ifdef DIAGNOSTIC 1054 if (ipprintfs) 1055 printf("save_rte: olen %d\n", olen); 1056 #endif 1057 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) 1058 return; 1059 bcopy(option, ip_srcrt.srcopt, olen); 1060 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); 1061 ip_srcrt.dst = dst; 1062 } 1063 1064 /* 1065 * Retrieve incoming source route for use in replies, 1066 * in the same form used by setsockopt. 1067 * The first hop is placed before the options, will be removed later. 1068 */ 1069 struct mbuf * 1070 ip_srcroute() 1071 { 1072 register struct in_addr *p, *q; 1073 register struct mbuf *m; 1074 1075 if (ip_nhops == 0) 1076 return ((struct mbuf *)0); 1077 m = m_get(M_DONTWAIT, MT_SOOPTS); 1078 if (m == 0) 1079 return ((struct mbuf *)0); 1080 1081 #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) 1082 1083 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ 1084 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + 1085 OPTSIZ; 1086 #ifdef DIAGNOSTIC 1087 if (ipprintfs) 1088 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); 1089 #endif 1090 1091 /* 1092 * First save first hop for return route 1093 */ 1094 p = &ip_srcrt.route[ip_nhops - 1]; 1095 *(mtod(m, struct in_addr *)) = *p--; 1096 #ifdef DIAGNOSTIC 1097 if (ipprintfs) 1098 printf(" hops %lx", ntohl(mtod(m, struct in_addr *)->s_addr)); 1099 #endif 1100 1101 /* 1102 * Copy option fields and padding (nop) to mbuf. 1103 */ 1104 ip_srcrt.nop = IPOPT_NOP; 1105 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; 1106 (void)memcpy(mtod(m, caddr_t) + sizeof(struct in_addr), 1107 &ip_srcrt.nop, OPTSIZ); 1108 q = (struct in_addr *)(mtod(m, caddr_t) + 1109 sizeof(struct in_addr) + OPTSIZ); 1110 #undef OPTSIZ 1111 /* 1112 * Record return path as an IP source route, 1113 * reversing the path (pointers are now aligned). 1114 */ 1115 while (p >= ip_srcrt.route) { 1116 #ifdef DIAGNOSTIC 1117 if (ipprintfs) 1118 printf(" %lx", ntohl(q->s_addr)); 1119 #endif 1120 *q++ = *p--; 1121 } 1122 /* 1123 * Last hop goes to final destination. 1124 */ 1125 *q = ip_srcrt.dst; 1126 #ifdef DIAGNOSTIC 1127 if (ipprintfs) 1128 printf(" %lx\n", ntohl(q->s_addr)); 1129 #endif 1130 return (m); 1131 } 1132 1133 /* 1134 * Strip out IP options, at higher 1135 * level protocol in the kernel. 1136 * Second argument is buffer to which options 1137 * will be moved, and return value is their length. 1138 * XXX should be deleted; last arg currently ignored. 1139 */ 1140 void 1141 ip_stripoptions(m, mopt) 1142 register struct mbuf *m; 1143 struct mbuf *mopt; 1144 { 1145 register int i; 1146 struct ip *ip = mtod(m, struct ip *); 1147 register caddr_t opts; 1148 int olen; 1149 1150 olen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); 1151 opts = (caddr_t)(ip + 1); 1152 i = m->m_len - (sizeof (struct ip) + olen); 1153 bcopy(opts + olen, opts, (unsigned)i); 1154 m->m_len -= olen; 1155 if (m->m_flags & M_PKTHDR) 1156 m->m_pkthdr.len -= olen; 1157 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2); 1158 } 1159 1160 u_char inetctlerrmap[PRC_NCMDS] = { 1161 0, 0, 0, 0, 1162 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1163 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1164 EMSGSIZE, EHOSTUNREACH, 0, 0, 1165 0, 0, 0, 0, 1166 ENOPROTOOPT 1167 }; 1168 1169 /* 1170 * Forward a packet. If some error occurs return the sender 1171 * an icmp packet. Note we can't always generate a meaningful 1172 * icmp message because icmp doesn't have a large enough repertoire 1173 * of codes and types. 1174 * 1175 * If not forwarding, just drop the packet. This could be confusing 1176 * if ipforwarding was zero but some routing protocol was advancing 1177 * us as a gateway to somewhere. However, we must let the routing 1178 * protocol deal with that. 1179 * 1180 * The srcrt parameter indicates whether the packet is being forwarded 1181 * via a source route. 1182 */ 1183 static void 1184 ip_forward(m, srcrt) 1185 struct mbuf *m; 1186 int srcrt; 1187 { 1188 register struct ip *ip = mtod(m, struct ip *); 1189 register struct sockaddr_in *sin; 1190 register struct rtentry *rt; 1191 int error, type = 0, code = 0; 1192 struct mbuf *mcopy; 1193 n_long dest; 1194 struct ifnet *destifp; 1195 1196 dest = 0; 1197 #ifdef DIAGNOSTIC 1198 if (ipprintfs) 1199 printf("forward: src %lx dst %lx ttl %x\n", 1200 ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl); 1201 #endif 1202 1203 1204 if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) { 1205 ipstat.ips_cantforward++; 1206 m_freem(m); 1207 return; 1208 } 1209 HTONS(ip->ip_id); 1210 if (ip->ip_ttl <= IPTTLDEC) { 1211 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); 1212 return; 1213 } 1214 ip->ip_ttl -= IPTTLDEC; 1215 1216 sin = (struct sockaddr_in *)&ipforward_rt.ro_dst; 1217 if ((rt = ipforward_rt.ro_rt) == 0 || 1218 ip->ip_dst.s_addr != sin->sin_addr.s_addr) { 1219 if (ipforward_rt.ro_rt) { 1220 RTFREE(ipforward_rt.ro_rt); 1221 ipforward_rt.ro_rt = 0; 1222 } 1223 sin->sin_family = AF_INET; 1224 sin->sin_len = sizeof(*sin); 1225 sin->sin_addr = ip->ip_dst; 1226 1227 rtalloc_ign(&ipforward_rt, RTF_PRCLONING); 1228 if (ipforward_rt.ro_rt == 0) { 1229 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0); 1230 return; 1231 } 1232 rt = ipforward_rt.ro_rt; 1233 } 1234 1235 /* 1236 * Save at most 64 bytes of the packet in case 1237 * we need to generate an ICMP message to the src. 1238 */ 1239 mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64)); 1240 1241 /* 1242 * If forwarding packet using same interface that it came in on, 1243 * perhaps should send a redirect to sender to shortcut a hop. 1244 * Only send redirect if source is sending directly to us, 1245 * and if packet was not source routed (or has any options). 1246 * Also, don't send redirect if forwarding using a default route 1247 * or a route modified by a redirect. 1248 */ 1249 #define satosin(sa) ((struct sockaddr_in *)(sa)) 1250 if (rt->rt_ifp == m->m_pkthdr.rcvif && 1251 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && 1252 satosin(rt_key(rt))->sin_addr.s_addr != 0 && 1253 ipsendredirects && !srcrt) { 1254 #define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa)) 1255 u_long src = ntohl(ip->ip_src.s_addr); 1256 1257 if (RTA(rt) && 1258 (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) { 1259 if (rt->rt_flags & RTF_GATEWAY) 1260 dest = satosin(rt->rt_gateway)->sin_addr.s_addr; 1261 else 1262 dest = ip->ip_dst.s_addr; 1263 /* Router requirements says to only send host redirects */ 1264 type = ICMP_REDIRECT; 1265 code = ICMP_REDIRECT_HOST; 1266 #ifdef DIAGNOSTIC 1267 if (ipprintfs) 1268 printf("redirect (%d) to %lx\n", code, (u_long)dest); 1269 #endif 1270 } 1271 } 1272 1273 error = ip_output(m, (struct mbuf *)0, &ipforward_rt, 1274 IP_FORWARDING, 0); 1275 if (error) 1276 ipstat.ips_cantforward++; 1277 else { 1278 ipstat.ips_forward++; 1279 if (type) 1280 ipstat.ips_redirectsent++; 1281 else { 1282 if (mcopy) 1283 m_freem(mcopy); 1284 return; 1285 } 1286 } 1287 if (mcopy == NULL) 1288 return; 1289 destifp = NULL; 1290 1291 switch (error) { 1292 1293 case 0: /* forwarded, but need redirect */ 1294 /* type, code set above */ 1295 break; 1296 1297 case ENETUNREACH: /* shouldn't happen, checked above */ 1298 case EHOSTUNREACH: 1299 case ENETDOWN: 1300 case EHOSTDOWN: 1301 default: 1302 type = ICMP_UNREACH; 1303 code = ICMP_UNREACH_HOST; 1304 break; 1305 1306 case EMSGSIZE: 1307 type = ICMP_UNREACH; 1308 code = ICMP_UNREACH_NEEDFRAG; 1309 if (ipforward_rt.ro_rt) 1310 destifp = ipforward_rt.ro_rt->rt_ifp; 1311 ipstat.ips_cantfrag++; 1312 break; 1313 1314 case ENOBUFS: 1315 type = ICMP_SOURCEQUENCH; 1316 code = 0; 1317 break; 1318 } 1319 icmp_error(mcopy, type, code, dest, destifp); 1320 } 1321 1322 void 1323 ip_savecontrol(inp, mp, ip, m) 1324 register struct inpcb *inp; 1325 register struct mbuf **mp; 1326 register struct ip *ip; 1327 register struct mbuf *m; 1328 { 1329 if (inp->inp_socket->so_options & SO_TIMESTAMP) { 1330 struct timeval tv; 1331 1332 microtime(&tv); 1333 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1334 SCM_TIMESTAMP, SOL_SOCKET); 1335 if (*mp) 1336 mp = &(*mp)->m_next; 1337 } 1338 if (inp->inp_flags & INP_RECVDSTADDR) { 1339 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst, 1340 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); 1341 if (*mp) 1342 mp = &(*mp)->m_next; 1343 } 1344 #ifdef notyet 1345 /* XXX 1346 * Moving these out of udp_input() made them even more broken 1347 * than they already were. 1348 */ 1349 /* options were tossed already */ 1350 if (inp->inp_flags & INP_RECVOPTS) { 1351 *mp = sbcreatecontrol((caddr_t) opts_deleted_above, 1352 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); 1353 if (*mp) 1354 mp = &(*mp)->m_next; 1355 } 1356 /* ip_srcroute doesn't do what we want here, need to fix */ 1357 if (inp->inp_flags & INP_RECVRETOPTS) { 1358 *mp = sbcreatecontrol((caddr_t) ip_srcroute(), 1359 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); 1360 if (*mp) 1361 mp = &(*mp)->m_next; 1362 } 1363 #endif 1364 if (inp->inp_flags & INP_RECVIF) { 1365 struct sockaddr_dl sdl; 1366 1367 sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]); 1368 sdl.sdl_family = AF_LINK; 1369 sdl.sdl_index = m->m_pkthdr.rcvif ? 1370 m->m_pkthdr.rcvif->if_index : 0; 1371 sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0; 1372 *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len, 1373 IP_RECVIF, IPPROTO_IP); 1374 if (*mp) 1375 mp = &(*mp)->m_next; 1376 } 1377 } 1378 1379 int 1380 ip_rsvp_init(struct socket *so) 1381 { 1382 if (so->so_type != SOCK_RAW || 1383 so->so_proto->pr_protocol != IPPROTO_RSVP) 1384 return EOPNOTSUPP; 1385 1386 if (ip_rsvpd != NULL) 1387 return EADDRINUSE; 1388 1389 ip_rsvpd = so; 1390 /* 1391 * This may seem silly, but we need to be sure we don't over-increment 1392 * the RSVP counter, in case something slips up. 1393 */ 1394 if (!ip_rsvp_on) { 1395 ip_rsvp_on = 1; 1396 rsvp_on++; 1397 } 1398 1399 return 0; 1400 } 1401 1402 int 1403 ip_rsvp_done(void) 1404 { 1405 ip_rsvpd = NULL; 1406 /* 1407 * This may seem silly, but we need to be sure we don't over-decrement 1408 * the RSVP counter, in case something slips up. 1409 */ 1410 if (ip_rsvp_on) { 1411 ip_rsvp_on = 0; 1412 rsvp_on--; 1413 } 1414 return 0; 1415 } 1416