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sys/netinet/ip_output.c
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1 /* 2 * Copyright (c) 1982, 1986, 1988, 1990, 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 30 * $FreeBSD: releng/5.3/sys/netinet/ip_output.c 136588 2004-10-16 08:43:07Z cvs2svn $ 31 */ 32 33 #include "opt_ipfw.h" 34 #include "opt_ipsec.h" 35 #include "opt_mac.h" 36 #include "opt_mbuf_stress_test.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/mac.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/protosw.h> 45 #include <sys/socket.h> 46 #include <sys/socketvar.h> 47 #include <sys/sysctl.h> 48 49 #include <net/if.h> 50 #include <net/netisr.h> 51 #include <net/pfil.h> 52 #include <net/route.h> 53 54 #include <netinet/in.h> 55 #include <netinet/in_systm.h> 56 #include <netinet/ip.h> 57 #include <netinet/in_pcb.h> 58 #include <netinet/in_var.h> 59 #include <netinet/ip_var.h> 60 61 #include <machine/in_cksum.h> 62 63 static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options"); 64 65 #ifdef IPSEC 66 #include <netinet6/ipsec.h> 67 #include <netkey/key.h> 68 #ifdef IPSEC_DEBUG 69 #include <netkey/key_debug.h> 70 #else 71 #define KEYDEBUG(lev,arg) 72 #endif 73 #endif /*IPSEC*/ 74 75 #ifdef FAST_IPSEC 76 #include <netipsec/ipsec.h> 77 #include <netipsec/xform.h> 78 #include <netipsec/key.h> 79 #endif /*FAST_IPSEC*/ 80 81 #define print_ip(x, a, y) printf("%s %d.%d.%d.%d%s",\ 82 x, (ntohl(a.s_addr)>>24)&0xFF,\ 83 (ntohl(a.s_addr)>>16)&0xFF,\ 84 (ntohl(a.s_addr)>>8)&0xFF,\ 85 (ntohl(a.s_addr))&0xFF, y); 86 87 u_short ip_id; 88 89 #ifdef MBUF_STRESS_TEST 90 int mbuf_frag_size = 0; 91 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW, 92 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size"); 93 #endif 94 95 static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *); 96 static struct ifnet *ip_multicast_if(struct in_addr *, int *); 97 static void ip_mloopback 98 (struct ifnet *, struct mbuf *, struct sockaddr_in *, int); 99 static int ip_getmoptions 100 (struct sockopt *, struct ip_moptions *); 101 static int ip_pcbopts(int, struct mbuf **, struct mbuf *); 102 static int ip_setmoptions 103 (struct sockopt *, struct ip_moptions **); 104 105 int ip_optcopy(struct ip *, struct ip *); 106 107 108 extern struct protosw inetsw[]; 109 110 /* 111 * IP output. The packet in mbuf chain m contains a skeletal IP 112 * header (with len, off, ttl, proto, tos, src, dst). 113 * The mbuf chain containing the packet will be freed. 114 * The mbuf opt, if present, will not be freed. 115 * In the IP forwarding case, the packet will arrive with options already 116 * inserted, so must have a NULL opt pointer. 117 */ 118 int 119 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, 120 int flags, struct ip_moptions *imo, struct inpcb *inp) 121 { 122 struct ip *ip; 123 struct ifnet *ifp = NULL; /* keep compiler happy */ 124 struct mbuf *m0; 125 int hlen = sizeof (struct ip); 126 int len, error = 0; 127 struct sockaddr_in *dst = NULL; /* keep compiler happy */ 128 struct in_ifaddr *ia = NULL; 129 int isbroadcast, sw_csum; 130 struct route iproute; 131 struct in_addr odst; 132 #ifdef IPFIREWALL_FORWARD 133 struct m_tag *fwd_tag = NULL; 134 #endif 135 #ifdef IPSEC 136 struct secpolicy *sp = NULL; 137 #endif 138 #ifdef FAST_IPSEC 139 struct secpolicy *sp = NULL; 140 struct tdb_ident *tdbi; 141 struct m_tag *mtag; 142 int s; 143 #endif /* FAST_IPSEC */ 144 145 M_ASSERTPKTHDR(m); 146 147 if (ro == NULL) { 148 ro = &iproute; 149 bzero(ro, sizeof (*ro)); 150 } 151 152 if (inp != NULL) 153 INP_LOCK_ASSERT(inp); 154 155 if (opt) { 156 len = 0; 157 m = ip_insertoptions(m, opt, &len); 158 if (len != 0) 159 hlen = len; 160 } 161 ip = mtod(m, struct ip *); 162 163 /* 164 * Fill in IP header. If we are not allowing fragmentation, 165 * then the ip_id field is meaningless, but we don't set it 166 * to zero. Doing so causes various problems when devices along 167 * the path (routers, load balancers, firewalls, etc.) illegally 168 * disable DF on our packet. Note that a 16-bit counter 169 * will wrap around in less than 10 seconds at 100 Mbit/s on a 170 * medium with MTU 1500. See Steven M. Bellovin, "A Technique 171 * for Counting NATted Hosts", Proc. IMW'02, available at 172 * <http://www.research.att.com/~smb/papers/fnat.pdf>. 173 */ 174 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 175 ip->ip_v = IPVERSION; 176 ip->ip_hl = hlen >> 2; 177 ip->ip_id = ip_newid(); 178 ipstat.ips_localout++; 179 } else { 180 hlen = ip->ip_hl << 2; 181 } 182 183 dst = (struct sockaddr_in *)&ro->ro_dst; 184 again: 185 /* 186 * If there is a cached route, 187 * check that it is to the same destination 188 * and is still up. If not, free it and try again. 189 * The address family should also be checked in case of sharing the 190 * cache with IPv6. 191 */ 192 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 193 dst->sin_family != AF_INET || 194 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) { 195 RTFREE(ro->ro_rt); 196 ro->ro_rt = (struct rtentry *)0; 197 } 198 #ifdef IPFIREWALL_FORWARD 199 if (ro->ro_rt == NULL && fwd_tag == NULL) { 200 #else 201 if (ro->ro_rt == NULL) { 202 #endif 203 bzero(dst, sizeof(*dst)); 204 dst->sin_family = AF_INET; 205 dst->sin_len = sizeof(*dst); 206 dst->sin_addr = ip->ip_dst; 207 } 208 /* 209 * If routing to interface only, 210 * short circuit routing lookup. 211 */ 212 if (flags & IP_ROUTETOIF) { 213 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == NULL && 214 (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == NULL) { 215 ipstat.ips_noroute++; 216 error = ENETUNREACH; 217 goto bad; 218 } 219 ifp = ia->ia_ifp; 220 ip->ip_ttl = 1; 221 isbroadcast = in_broadcast(dst->sin_addr, ifp); 222 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 223 imo != NULL && imo->imo_multicast_ifp != NULL) { 224 /* 225 * Bypass the normal routing lookup for multicast 226 * packets if the interface is specified. 227 */ 228 ifp = imo->imo_multicast_ifp; 229 IFP_TO_IA(ifp, ia); 230 isbroadcast = 0; /* fool gcc */ 231 } else { 232 /* 233 * We want to do any cloning requested by the link layer, 234 * as this is probably required in all cases for correct 235 * operation (as it is for ARP). 236 */ 237 if (ro->ro_rt == NULL) 238 rtalloc_ign(ro, 0); 239 if (ro->ro_rt == NULL) { 240 ipstat.ips_noroute++; 241 error = EHOSTUNREACH; 242 goto bad; 243 } 244 ia = ifatoia(ro->ro_rt->rt_ifa); 245 ifp = ro->ro_rt->rt_ifp; 246 ro->ro_rt->rt_rmx.rmx_pksent++; 247 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 248 dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 249 if (ro->ro_rt->rt_flags & RTF_HOST) 250 isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST); 251 else 252 isbroadcast = in_broadcast(dst->sin_addr, ifp); 253 } 254 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 255 struct in_multi *inm; 256 257 m->m_flags |= M_MCAST; 258 /* 259 * IP destination address is multicast. Make sure "dst" 260 * still points to the address in "ro". (It may have been 261 * changed to point to a gateway address, above.) 262 */ 263 dst = (struct sockaddr_in *)&ro->ro_dst; 264 /* 265 * See if the caller provided any multicast options 266 */ 267 if (imo != NULL) { 268 ip->ip_ttl = imo->imo_multicast_ttl; 269 if (imo->imo_multicast_vif != -1) 270 ip->ip_src.s_addr = 271 ip_mcast_src ? 272 ip_mcast_src(imo->imo_multicast_vif) : 273 INADDR_ANY; 274 } else 275 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 276 /* 277 * Confirm that the outgoing interface supports multicast. 278 */ 279 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 280 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 281 ipstat.ips_noroute++; 282 error = ENETUNREACH; 283 goto bad; 284 } 285 } 286 /* 287 * If source address not specified yet, use address 288 * of outgoing interface. 289 */ 290 if (ip->ip_src.s_addr == INADDR_ANY) { 291 /* Interface may have no addresses. */ 292 if (ia != NULL) 293 ip->ip_src = IA_SIN(ia)->sin_addr; 294 } 295 296 IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm); 297 if (inm != NULL && 298 (imo == NULL || imo->imo_multicast_loop)) { 299 /* 300 * If we belong to the destination multicast group 301 * on the outgoing interface, and the caller did not 302 * forbid loopback, loop back a copy. 303 */ 304 ip_mloopback(ifp, m, dst, hlen); 305 } 306 else { 307 /* 308 * If we are acting as a multicast router, perform 309 * multicast forwarding as if the packet had just 310 * arrived on the interface to which we are about 311 * to send. The multicast forwarding function 312 * recursively calls this function, using the 313 * IP_FORWARDING flag to prevent infinite recursion. 314 * 315 * Multicasts that are looped back by ip_mloopback(), 316 * above, will be forwarded by the ip_input() routine, 317 * if necessary. 318 */ 319 if (ip_mrouter && (flags & IP_FORWARDING) == 0) { 320 /* 321 * If rsvp daemon is not running, do not 322 * set ip_moptions. This ensures that the packet 323 * is multicast and not just sent down one link 324 * as prescribed by rsvpd. 325 */ 326 if (!rsvp_on) 327 imo = NULL; 328 if (ip_mforward && 329 ip_mforward(ip, ifp, m, imo) != 0) { 330 m_freem(m); 331 goto done; 332 } 333 } 334 } 335 336 /* 337 * Multicasts with a time-to-live of zero may be looped- 338 * back, above, but must not be transmitted on a network. 339 * Also, multicasts addressed to the loopback interface 340 * are not sent -- the above call to ip_mloopback() will 341 * loop back a copy if this host actually belongs to the 342 * destination group on the loopback interface. 343 */ 344 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 345 m_freem(m); 346 goto done; 347 } 348 349 goto sendit; 350 } 351 #ifndef notdef 352 /* 353 * If the source address is not specified yet, use the address 354 * of the outoing interface. 355 */ 356 if (ip->ip_src.s_addr == INADDR_ANY) { 357 /* Interface may have no addresses. */ 358 if (ia != NULL) { 359 ip->ip_src = IA_SIN(ia)->sin_addr; 360 } 361 } 362 #endif /* notdef */ 363 #ifdef ALTQ 364 /* 365 * disable packet drop hack. 366 * packetdrop should be done by queueing. 367 */ 368 #else /* !ALTQ */ 369 /* 370 * Verify that we have any chance at all of being able to queue 371 * the packet or packet fragments 372 */ 373 if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >= 374 ifp->if_snd.ifq_maxlen) { 375 error = ENOBUFS; 376 ipstat.ips_odropped++; 377 goto bad; 378 } 379 #endif /* !ALTQ */ 380 381 /* 382 * Look for broadcast address and 383 * verify user is allowed to send 384 * such a packet. 385 */ 386 if (isbroadcast) { 387 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 388 error = EADDRNOTAVAIL; 389 goto bad; 390 } 391 if ((flags & IP_ALLOWBROADCAST) == 0) { 392 error = EACCES; 393 goto bad; 394 } 395 /* don't allow broadcast messages to be fragmented */ 396 if (ip->ip_len > ifp->if_mtu) { 397 error = EMSGSIZE; 398 goto bad; 399 } 400 if (flags & IP_SENDONES) 401 ip->ip_dst.s_addr = INADDR_BROADCAST; 402 m->m_flags |= M_BCAST; 403 } else { 404 m->m_flags &= ~M_BCAST; 405 } 406 407 sendit: 408 #ifdef IPSEC 409 /* get SP for this packet */ 410 if (inp == NULL) 411 sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 412 flags, &error); 413 else 414 sp = ipsec4_getpolicybypcb(m, IPSEC_DIR_OUTBOUND, inp, &error); 415 416 if (sp == NULL) { 417 ipsecstat.out_inval++; 418 goto bad; 419 } 420 421 error = 0; 422 423 /* check policy */ 424 switch (sp->policy) { 425 case IPSEC_POLICY_DISCARD: 426 /* 427 * This packet is just discarded. 428 */ 429 ipsecstat.out_polvio++; 430 goto bad; 431 432 case IPSEC_POLICY_BYPASS: 433 case IPSEC_POLICY_NONE: 434 case IPSEC_POLICY_TCP: 435 /* no need to do IPsec. */ 436 goto skip_ipsec; 437 438 case IPSEC_POLICY_IPSEC: 439 if (sp->req == NULL) { 440 /* acquire a policy */ 441 error = key_spdacquire(sp); 442 goto bad; 443 } 444 break; 445 446 case IPSEC_POLICY_ENTRUST: 447 default: 448 printf("ip_output: Invalid policy found. %d\n", sp->policy); 449 } 450 { 451 struct ipsec_output_state state; 452 bzero(&state, sizeof(state)); 453 state.m = m; 454 if (flags & IP_ROUTETOIF) { 455 state.ro = &iproute; 456 bzero(&iproute, sizeof(iproute)); 457 } else 458 state.ro = ro; 459 state.dst = (struct sockaddr *)dst; 460 461 ip->ip_sum = 0; 462 463 /* 464 * XXX 465 * delayed checksums are not currently compatible with IPsec 466 */ 467 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 468 in_delayed_cksum(m); 469 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 470 } 471 472 ip->ip_len = htons(ip->ip_len); 473 ip->ip_off = htons(ip->ip_off); 474 475 error = ipsec4_output(&state, sp, flags); 476 477 m = state.m; 478 if (flags & IP_ROUTETOIF) { 479 /* 480 * if we have tunnel mode SA, we may need to ignore 481 * IP_ROUTETOIF. 482 */ 483 if (state.ro != &iproute || state.ro->ro_rt != NULL) { 484 flags &= ~IP_ROUTETOIF; 485 ro = state.ro; 486 } 487 } else 488 ro = state.ro; 489 dst = (struct sockaddr_in *)state.dst; 490 if (error) { 491 /* mbuf is already reclaimed in ipsec4_output. */ 492 m = NULL; 493 switch (error) { 494 case EHOSTUNREACH: 495 case ENETUNREACH: 496 case EMSGSIZE: 497 case ENOBUFS: 498 case ENOMEM: 499 break; 500 default: 501 printf("ip4_output (ipsec): error code %d\n", error); 502 /*fall through*/ 503 case ENOENT: 504 /* don't show these error codes to the user */ 505 error = 0; 506 break; 507 } 508 goto bad; 509 } 510 511 /* be sure to update variables that are affected by ipsec4_output() */ 512 ip = mtod(m, struct ip *); 513 hlen = ip->ip_hl << 2; 514 if (ro->ro_rt == NULL) { 515 if ((flags & IP_ROUTETOIF) == 0) { 516 printf("ip_output: " 517 "can't update route after IPsec processing\n"); 518 error = EHOSTUNREACH; /*XXX*/ 519 goto bad; 520 } 521 } else { 522 if (state.encap) { 523 ia = ifatoia(ro->ro_rt->rt_ifa); 524 ifp = ro->ro_rt->rt_ifp; 525 } 526 } 527 } 528 529 /* make it flipped, again. */ 530 ip->ip_len = ntohs(ip->ip_len); 531 ip->ip_off = ntohs(ip->ip_off); 532 skip_ipsec: 533 #endif /*IPSEC*/ 534 #ifdef FAST_IPSEC 535 /* 536 * Check the security policy (SP) for the packet and, if 537 * required, do IPsec-related processing. There are two 538 * cases here; the first time a packet is sent through 539 * it will be untagged and handled by ipsec4_checkpolicy. 540 * If the packet is resubmitted to ip_output (e.g. after 541 * AH, ESP, etc. processing), there will be a tag to bypass 542 * the lookup and related policy checking. 543 */ 544 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 545 s = splnet(); 546 if (mtag != NULL) { 547 tdbi = (struct tdb_ident *)(mtag + 1); 548 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND); 549 if (sp == NULL) 550 error = -EINVAL; /* force silent drop */ 551 m_tag_delete(m, mtag); 552 } else { 553 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, 554 &error, inp); 555 } 556 /* 557 * There are four return cases: 558 * sp != NULL apply IPsec policy 559 * sp == NULL, error == 0 no IPsec handling needed 560 * sp == NULL, error == -EINVAL discard packet w/o error 561 * sp == NULL, error != 0 discard packet, report error 562 */ 563 if (sp != NULL) { 564 /* Loop detection, check if ipsec processing already done */ 565 KASSERT(sp->req != NULL, ("ip_output: no ipsec request")); 566 for (mtag = m_tag_first(m); mtag != NULL; 567 mtag = m_tag_next(m, mtag)) { 568 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT) 569 continue; 570 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE && 571 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED) 572 continue; 573 /* 574 * Check if policy has an SA associated with it. 575 * This can happen when an SP has yet to acquire 576 * an SA; e.g. on first reference. If it occurs, 577 * then we let ipsec4_process_packet do its thing. 578 */ 579 if (sp->req->sav == NULL) 580 break; 581 tdbi = (struct tdb_ident *)(mtag + 1); 582 if (tdbi->spi == sp->req->sav->spi && 583 tdbi->proto == sp->req->sav->sah->saidx.proto && 584 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst, 585 sizeof (union sockaddr_union)) == 0) { 586 /* 587 * No IPsec processing is needed, free 588 * reference to SP. 589 * 590 * NB: null pointer to avoid free at 591 * done: below. 592 */ 593 KEY_FREESP(&sp), sp = NULL; 594 splx(s); 595 goto spd_done; 596 } 597 } 598 599 /* 600 * Do delayed checksums now because we send before 601 * this is done in the normal processing path. 602 */ 603 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 604 in_delayed_cksum(m); 605 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 606 } 607 608 ip->ip_len = htons(ip->ip_len); 609 ip->ip_off = htons(ip->ip_off); 610 611 /* NB: callee frees mbuf */ 612 error = ipsec4_process_packet(m, sp->req, flags, 0); 613 /* 614 * Preserve KAME behaviour: ENOENT can be returned 615 * when an SA acquire is in progress. Don't propagate 616 * this to user-level; it confuses applications. 617 * 618 * XXX this will go away when the SADB is redone. 619 */ 620 if (error == ENOENT) 621 error = 0; 622 splx(s); 623 goto done; 624 } else { 625 splx(s); 626 627 if (error != 0) { 628 /* 629 * Hack: -EINVAL is used to signal that a packet 630 * should be silently discarded. This is typically 631 * because we asked key management for an SA and 632 * it was delayed (e.g. kicked up to IKE). 633 */ 634 if (error == -EINVAL) 635 error = 0; 636 goto bad; 637 } else { 638 /* No IPsec processing for this packet. */ 639 } 640 #ifdef notyet 641 /* 642 * If deferred crypto processing is needed, check that 643 * the interface supports it. 644 */ 645 mtag = m_tag_find(m, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL); 646 if (mtag != NULL && (ifp->if_capenable & IFCAP_IPSEC) == 0) { 647 /* notify IPsec to do its own crypto */ 648 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 649 error = EHOSTUNREACH; 650 goto bad; 651 } 652 #endif 653 } 654 spd_done: 655 #endif /* FAST_IPSEC */ 656 657 /* Jump over all PFIL processing if hooks are not active. */ 658 if (inet_pfil_hook.ph_busy_count == -1) 659 goto passout; 660 661 /* Run through list of hooks for output packets. */ 662 odst.s_addr = ip->ip_dst.s_addr; 663 error = pfil_run_hooks(&inet_pfil_hook, &m, ifp, PFIL_OUT, inp); 664 if (error != 0 || m == NULL) 665 goto done; 666 667 ip = mtod(m, struct ip *); 668 669 /* See if destination IP address was changed by packet filter. */ 670 if (odst.s_addr != ip->ip_dst.s_addr) { 671 m->m_flags |= M_SKIP_FIREWALL; 672 if (in_localip(ip->ip_dst)) { 673 m->m_flags |= M_FASTFWD_OURS; 674 if (m->m_pkthdr.rcvif == NULL) 675 m->m_pkthdr.rcvif = loif; 676 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 677 m->m_pkthdr.csum_flags |= 678 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 679 m->m_pkthdr.csum_data = 0xffff; 680 } 681 m->m_pkthdr.csum_flags |= 682 CSUM_IP_CHECKED | CSUM_IP_VALID; 683 684 error = netisr_queue(NETISR_IP, m); 685 goto done; 686 } else 687 goto again; 688 } 689 690 #ifdef IPFIREWALL_FORWARD 691 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 692 if (m->m_flags & M_FASTFWD_OURS) { 693 if (m->m_pkthdr.rcvif == NULL) 694 m->m_pkthdr.rcvif = loif; 695 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 696 m->m_pkthdr.csum_flags |= 697 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 698 m->m_pkthdr.csum_data = 0xffff; 699 } 700 m->m_pkthdr.csum_flags |= 701 CSUM_IP_CHECKED | CSUM_IP_VALID; 702 703 error = netisr_queue(NETISR_IP, m); 704 goto done; 705 } 706 /* Or forward to some other address? */ 707 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL); 708 if (fwd_tag) { 709 if (!in_localip(ip->ip_src) && !in_localaddr(ip->ip_dst)) { 710 dst = (struct sockaddr_in *)&ro->ro_dst; 711 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 712 m->m_flags |= M_SKIP_FIREWALL; 713 m_tag_delete(m, fwd_tag); 714 goto again; 715 } else { 716 m_tag_delete(m, fwd_tag); 717 /* Continue. */ 718 } 719 } 720 #endif 721 722 passout: 723 /* 127/8 must not appear on wire - RFC1122. */ 724 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 725 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 726 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 727 ipstat.ips_badaddr++; 728 error = EADDRNOTAVAIL; 729 goto bad; 730 } 731 } 732 733 m->m_pkthdr.csum_flags |= CSUM_IP; 734 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist; 735 if (sw_csum & CSUM_DELAY_DATA) { 736 in_delayed_cksum(m); 737 sw_csum &= ~CSUM_DELAY_DATA; 738 } 739 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 740 741 /* 742 * If small enough for interface, or the interface will take 743 * care of the fragmentation for us, can just send directly. 744 */ 745 if (ip->ip_len <= ifp->if_mtu || (ifp->if_hwassist & CSUM_FRAGMENT && 746 ((ip->ip_off & IP_DF) == 0))) { 747 ip->ip_len = htons(ip->ip_len); 748 ip->ip_off = htons(ip->ip_off); 749 ip->ip_sum = 0; 750 if (sw_csum & CSUM_DELAY_IP) 751 ip->ip_sum = in_cksum(m, hlen); 752 753 /* Record statistics for this interface address. */ 754 if (!(flags & IP_FORWARDING) && ia) { 755 ia->ia_ifa.if_opackets++; 756 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 757 } 758 759 #ifdef IPSEC 760 /* clean ipsec history once it goes out of the node */ 761 ipsec_delaux(m); 762 #endif 763 764 #ifdef MBUF_STRESS_TEST 765 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 766 m = m_fragment(m, M_DONTWAIT, mbuf_frag_size); 767 #endif 768 error = (*ifp->if_output)(ifp, m, 769 (struct sockaddr *)dst, ro->ro_rt); 770 goto done; 771 } 772 773 if (ip->ip_off & IP_DF) { 774 error = EMSGSIZE; 775 /* 776 * This case can happen if the user changed the MTU 777 * of an interface after enabling IP on it. Because 778 * most netifs don't keep track of routes pointing to 779 * them, there is no way for one to update all its 780 * routes when the MTU is changed. 781 */ 782 if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST)) && 783 (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) { 784 ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu; 785 } 786 ipstat.ips_cantfrag++; 787 goto bad; 788 } 789 790 /* 791 * Too large for interface; fragment if possible. If successful, 792 * on return, m will point to a list of packets to be sent. 793 */ 794 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, sw_csum); 795 if (error) 796 goto bad; 797 for (; m; m = m0) { 798 m0 = m->m_nextpkt; 799 m->m_nextpkt = 0; 800 #ifdef IPSEC 801 /* clean ipsec history once it goes out of the node */ 802 ipsec_delaux(m); 803 #endif 804 if (error == 0) { 805 /* Record statistics for this interface address. */ 806 if (ia != NULL) { 807 ia->ia_ifa.if_opackets++; 808 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 809 } 810 811 error = (*ifp->if_output)(ifp, m, 812 (struct sockaddr *)dst, ro->ro_rt); 813 } else 814 m_freem(m); 815 } 816 817 if (error == 0) 818 ipstat.ips_fragmented++; 819 820 done: 821 if (ro == &iproute && ro->ro_rt) { 822 RTFREE(ro->ro_rt); 823 } 824 #ifdef IPSEC 825 if (sp != NULL) { 826 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 827 printf("DP ip_output call free SP:%p\n", sp)); 828 key_freesp(sp); 829 } 830 #endif 831 #ifdef FAST_IPSEC 832 if (sp != NULL) 833 KEY_FREESP(&sp); 834 #endif 835 return (error); 836 bad: 837 m_freem(m); 838 goto done; 839 } 840 841 /* 842 * Create a chain of fragments which fit the given mtu. m_frag points to the 843 * mbuf to be fragmented; on return it points to the chain with the fragments. 844 * Return 0 if no error. If error, m_frag may contain a partially built 845 * chain of fragments that should be freed by the caller. 846 * 847 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist) 848 * sw_csum contains the delayed checksums flags (e.g., CSUM_DELAY_IP). 849 */ 850 int 851 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 852 u_long if_hwassist_flags, int sw_csum) 853 { 854 int error = 0; 855 int hlen = ip->ip_hl << 2; 856 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */ 857 int off; 858 struct mbuf *m0 = *m_frag; /* the original packet */ 859 int firstlen; 860 struct mbuf **mnext; 861 int nfrags; 862 863 if (ip->ip_off & IP_DF) { /* Fragmentation not allowed */ 864 ipstat.ips_cantfrag++; 865 return EMSGSIZE; 866 } 867 868 /* 869 * Must be able to put at least 8 bytes per fragment. 870 */ 871 if (len < 8) 872 return EMSGSIZE; 873 874 /* 875 * If the interface will not calculate checksums on 876 * fragmented packets, then do it here. 877 */ 878 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA && 879 (if_hwassist_flags & CSUM_IP_FRAGS) == 0) { 880 in_delayed_cksum(m0); 881 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 882 } 883 884 if (len > PAGE_SIZE) { 885 /* 886 * Fragment large datagrams such that each segment 887 * contains a multiple of PAGE_SIZE amount of data, 888 * plus headers. This enables a receiver to perform 889 * page-flipping zero-copy optimizations. 890 * 891 * XXX When does this help given that sender and receiver 892 * could have different page sizes, and also mtu could 893 * be less than the receiver's page size ? 894 */ 895 int newlen; 896 struct mbuf *m; 897 898 for (m = m0, off = 0; m && (off+m->m_len) <= mtu; m = m->m_next) 899 off += m->m_len; 900 901 /* 902 * firstlen (off - hlen) must be aligned on an 903 * 8-byte boundary 904 */ 905 if (off < hlen) 906 goto smart_frag_failure; 907 off = ((off - hlen) & ~7) + hlen; 908 newlen = (~PAGE_MASK) & mtu; 909 if ((newlen + sizeof (struct ip)) > mtu) { 910 /* we failed, go back the default */ 911 smart_frag_failure: 912 newlen = len; 913 off = hlen + len; 914 } 915 len = newlen; 916 917 } else { 918 off = hlen + len; 919 } 920 921 firstlen = off - hlen; 922 mnext = &m0->m_nextpkt; /* pointer to next packet */ 923 924 /* 925 * Loop through length of segment after first fragment, 926 * make new header and copy data of each part and link onto chain. 927 * Here, m0 is the original packet, m is the fragment being created. 928 * The fragments are linked off the m_nextpkt of the original 929 * packet, which after processing serves as the first fragment. 930 */ 931 for (nfrags = 1; off < ip->ip_len; off += len, nfrags++) { 932 struct ip *mhip; /* ip header on the fragment */ 933 struct mbuf *m; 934 int mhlen = sizeof (struct ip); 935 936 MGETHDR(m, M_DONTWAIT, MT_HEADER); 937 if (m == NULL) { 938 error = ENOBUFS; 939 ipstat.ips_odropped++; 940 goto done; 941 } 942 m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG; 943 /* 944 * In the first mbuf, leave room for the link header, then 945 * copy the original IP header including options. The payload 946 * goes into an additional mbuf chain returned by m_copy(). 947 */ 948 m->m_data += max_linkhdr; 949 mhip = mtod(m, struct ip *); 950 *mhip = *ip; 951 if (hlen > sizeof (struct ip)) { 952 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 953 mhip->ip_v = IPVERSION; 954 mhip->ip_hl = mhlen >> 2; 955 } 956 m->m_len = mhlen; 957 /* XXX do we need to add ip->ip_off below ? */ 958 mhip->ip_off = ((off - hlen) >> 3) + ip->ip_off; 959 if (off + len >= ip->ip_len) { /* last fragment */ 960 len = ip->ip_len - off; 961 m->m_flags |= M_LASTFRAG; 962 } else 963 mhip->ip_off |= IP_MF; 964 mhip->ip_len = htons((u_short)(len + mhlen)); 965 m->m_next = m_copy(m0, off, len); 966 if (m->m_next == NULL) { /* copy failed */ 967 m_free(m); 968 error = ENOBUFS; /* ??? */ 969 ipstat.ips_odropped++; 970 goto done; 971 } 972 m->m_pkthdr.len = mhlen + len; 973 m->m_pkthdr.rcvif = (struct ifnet *)0; 974 #ifdef MAC 975 mac_create_fragment(m0, m); 976 #endif 977 m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags; 978 mhip->ip_off = htons(mhip->ip_off); 979 mhip->ip_sum = 0; 980 if (sw_csum & CSUM_DELAY_IP) 981 mhip->ip_sum = in_cksum(m, mhlen); 982 *mnext = m; 983 mnext = &m->m_nextpkt; 984 } 985 ipstat.ips_ofragments += nfrags; 986 987 /* set first marker for fragment chain */ 988 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 989 m0->m_pkthdr.csum_data = nfrags; 990 991 /* 992 * Update first fragment by trimming what's been copied out 993 * and updating header. 994 */ 995 m_adj(m0, hlen + firstlen - ip->ip_len); 996 m0->m_pkthdr.len = hlen + firstlen; 997 ip->ip_len = htons((u_short)m0->m_pkthdr.len); 998 ip->ip_off |= IP_MF; 999 ip->ip_off = htons(ip->ip_off); 1000 ip->ip_sum = 0; 1001 if (sw_csum & CSUM_DELAY_IP) 1002 ip->ip_sum = in_cksum(m0, hlen); 1003 1004 done: 1005 *m_frag = m0; 1006 return error; 1007 } 1008 1009 void 1010 in_delayed_cksum(struct mbuf *m) 1011 { 1012 struct ip *ip; 1013 u_short csum, offset; 1014 1015 ip = mtod(m, struct ip *); 1016 offset = ip->ip_hl << 2 ; 1017 csum = in_cksum_skip(m, ip->ip_len, offset); 1018 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0) 1019 csum = 0xffff; 1020 offset += m->m_pkthdr.csum_data; /* checksum offset */ 1021 1022 if (offset + sizeof(u_short) > m->m_len) { 1023 printf("delayed m_pullup, m->len: %d off: %d p: %d\n", 1024 m->m_len, offset, ip->ip_p); 1025 /* 1026 * XXX 1027 * this shouldn't happen, but if it does, the 1028 * correct behavior may be to insert the checksum 1029 * in the existing chain instead of rearranging it. 1030 */ 1031 m = m_pullup(m, offset + sizeof(u_short)); 1032 } 1033 *(u_short *)(m->m_data + offset) = csum; 1034 } 1035 1036 /* 1037 * Insert IP options into preformed packet. 1038 * Adjust IP destination as required for IP source routing, 1039 * as indicated by a non-zero in_addr at the start of the options. 1040 * 1041 * XXX This routine assumes that the packet has no options in place. 1042 */ 1043 static struct mbuf * 1044 ip_insertoptions(m, opt, phlen) 1045 register struct mbuf *m; 1046 struct mbuf *opt; 1047 int *phlen; 1048 { 1049 register struct ipoption *p = mtod(opt, struct ipoption *); 1050 struct mbuf *n; 1051 register struct ip *ip = mtod(m, struct ip *); 1052 unsigned optlen; 1053 1054 optlen = opt->m_len - sizeof(p->ipopt_dst); 1055 if (optlen + ip->ip_len > IP_MAXPACKET) { 1056 *phlen = 0; 1057 return (m); /* XXX should fail */ 1058 } 1059 if (p->ipopt_dst.s_addr) 1060 ip->ip_dst = p->ipopt_dst; 1061 if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) { 1062 MGETHDR(n, M_DONTWAIT, MT_HEADER); 1063 if (n == NULL) { 1064 *phlen = 0; 1065 return (m); 1066 } 1067 n->m_pkthdr.rcvif = (struct ifnet *)0; 1068 #ifdef MAC 1069 mac_create_mbuf_from_mbuf(m, n); 1070 #endif 1071 n->m_pkthdr.len = m->m_pkthdr.len + optlen; 1072 m->m_len -= sizeof(struct ip); 1073 m->m_data += sizeof(struct ip); 1074 n->m_next = m; 1075 m = n; 1076 m->m_len = optlen + sizeof(struct ip); 1077 m->m_data += max_linkhdr; 1078 bcopy(ip, mtod(m, void *), sizeof(struct ip)); 1079 } else { 1080 m->m_data -= optlen; 1081 m->m_len += optlen; 1082 m->m_pkthdr.len += optlen; 1083 bcopy(ip, mtod(m, void *), sizeof(struct ip)); 1084 } 1085 ip = mtod(m, struct ip *); 1086 bcopy(p->ipopt_list, ip + 1, optlen); 1087 *phlen = sizeof(struct ip) + optlen; 1088 ip->ip_v = IPVERSION; 1089 ip->ip_hl = *phlen >> 2; 1090 ip->ip_len += optlen; 1091 return (m); 1092 } 1093 1094 /* 1095 * Copy options from ip to jp, 1096 * omitting those not copied during fragmentation. 1097 */ 1098 int 1099 ip_optcopy(ip, jp) 1100 struct ip *ip, *jp; 1101 { 1102 register u_char *cp, *dp; 1103 int opt, optlen, cnt; 1104 1105 cp = (u_char *)(ip + 1); 1106 dp = (u_char *)(jp + 1); 1107 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 1108 for (; cnt > 0; cnt -= optlen, cp += optlen) { 1109 opt = cp[0]; 1110 if (opt == IPOPT_EOL) 1111 break; 1112 if (opt == IPOPT_NOP) { 1113 /* Preserve for IP mcast tunnel's LSRR alignment. */ 1114 *dp++ = IPOPT_NOP; 1115 optlen = 1; 1116 continue; 1117 } 1118 1119 KASSERT(cnt >= IPOPT_OLEN + sizeof(*cp), 1120 ("ip_optcopy: malformed ipv4 option")); 1121 optlen = cp[IPOPT_OLEN]; 1122 KASSERT(optlen >= IPOPT_OLEN + sizeof(*cp) && optlen <= cnt, 1123 ("ip_optcopy: malformed ipv4 option")); 1124 1125 /* bogus lengths should have been caught by ip_dooptions */ 1126 if (optlen > cnt) 1127 optlen = cnt; 1128 if (IPOPT_COPIED(opt)) { 1129 bcopy(cp, dp, optlen); 1130 dp += optlen; 1131 } 1132 } 1133 for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++) 1134 *dp++ = IPOPT_EOL; 1135 return (optlen); 1136 } 1137 1138 /* 1139 * IP socket option processing. 1140 */ 1141 int 1142 ip_ctloutput(so, sopt) 1143 struct socket *so; 1144 struct sockopt *sopt; 1145 { 1146 struct inpcb *inp = sotoinpcb(so); 1147 int error, optval; 1148 1149 error = optval = 0; 1150 if (sopt->sopt_level != IPPROTO_IP) { 1151 return (EINVAL); 1152 } 1153 1154 switch (sopt->sopt_dir) { 1155 case SOPT_SET: 1156 switch (sopt->sopt_name) { 1157 case IP_OPTIONS: 1158 #ifdef notyet 1159 case IP_RETOPTS: 1160 #endif 1161 { 1162 struct mbuf *m; 1163 if (sopt->sopt_valsize > MLEN) { 1164 error = EMSGSIZE; 1165 break; 1166 } 1167 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_HEADER); 1168 if (m == NULL) { 1169 error = ENOBUFS; 1170 break; 1171 } 1172 m->m_len = sopt->sopt_valsize; 1173 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 1174 m->m_len); 1175 1176 return (ip_pcbopts(sopt->sopt_name, &inp->inp_options, 1177 m)); 1178 } 1179 1180 case IP_TOS: 1181 case IP_TTL: 1182 case IP_RECVOPTS: 1183 case IP_RECVRETOPTS: 1184 case IP_RECVDSTADDR: 1185 case IP_RECVTTL: 1186 case IP_RECVIF: 1187 case IP_FAITH: 1188 case IP_ONESBCAST: 1189 error = sooptcopyin(sopt, &optval, sizeof optval, 1190 sizeof optval); 1191 if (error) 1192 break; 1193 1194 switch (sopt->sopt_name) { 1195 case IP_TOS: 1196 inp->inp_ip_tos = optval; 1197 break; 1198 1199 case IP_TTL: 1200 inp->inp_ip_ttl = optval; 1201 break; 1202 #define OPTSET(bit) do { \ 1203 INP_LOCK(inp); \ 1204 if (optval) \ 1205 inp->inp_flags |= bit; \ 1206 else \ 1207 inp->inp_flags &= ~bit; \ 1208 INP_UNLOCK(inp); \ 1209 } while (0) 1210 1211 case IP_RECVOPTS: 1212 OPTSET(INP_RECVOPTS); 1213 break; 1214 1215 case IP_RECVRETOPTS: 1216 OPTSET(INP_RECVRETOPTS); 1217 break; 1218 1219 case IP_RECVDSTADDR: 1220 OPTSET(INP_RECVDSTADDR); 1221 break; 1222 1223 case IP_RECVTTL: 1224 OPTSET(INP_RECVTTL); 1225 break; 1226 1227 case IP_RECVIF: 1228 OPTSET(INP_RECVIF); 1229 break; 1230 1231 case IP_FAITH: 1232 OPTSET(INP_FAITH); 1233 break; 1234 1235 case IP_ONESBCAST: 1236 OPTSET(INP_ONESBCAST); 1237 break; 1238 } 1239 break; 1240 #undef OPTSET 1241 1242 case IP_MULTICAST_IF: 1243 case IP_MULTICAST_VIF: 1244 case IP_MULTICAST_TTL: 1245 case IP_MULTICAST_LOOP: 1246 case IP_ADD_MEMBERSHIP: 1247 case IP_DROP_MEMBERSHIP: 1248 error = ip_setmoptions(sopt, &inp->inp_moptions); 1249 break; 1250 1251 case IP_PORTRANGE: 1252 error = sooptcopyin(sopt, &optval, sizeof optval, 1253 sizeof optval); 1254 if (error) 1255 break; 1256 1257 INP_LOCK(inp); 1258 switch (optval) { 1259 case IP_PORTRANGE_DEFAULT: 1260 inp->inp_flags &= ~(INP_LOWPORT); 1261 inp->inp_flags &= ~(INP_HIGHPORT); 1262 break; 1263 1264 case IP_PORTRANGE_HIGH: 1265 inp->inp_flags &= ~(INP_LOWPORT); 1266 inp->inp_flags |= INP_HIGHPORT; 1267 break; 1268 1269 case IP_PORTRANGE_LOW: 1270 inp->inp_flags &= ~(INP_HIGHPORT); 1271 inp->inp_flags |= INP_LOWPORT; 1272 break; 1273 1274 default: 1275 error = EINVAL; 1276 break; 1277 } 1278 INP_UNLOCK(inp); 1279 break; 1280 1281 #if defined(IPSEC) || defined(FAST_IPSEC) 1282 case IP_IPSEC_POLICY: 1283 { 1284 caddr_t req; 1285 size_t len = 0; 1286 int priv; 1287 struct mbuf *m; 1288 int optname; 1289 1290 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1291 break; 1292 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1293 break; 1294 priv = (sopt->sopt_td != NULL && 1295 suser(sopt->sopt_td) != 0) ? 0 : 1; 1296 req = mtod(m, caddr_t); 1297 len = m->m_len; 1298 optname = sopt->sopt_name; 1299 error = ipsec4_set_policy(inp, optname, req, len, priv); 1300 m_freem(m); 1301 break; 1302 } 1303 #endif /*IPSEC*/ 1304 1305 default: 1306 error = ENOPROTOOPT; 1307 break; 1308 } 1309 break; 1310 1311 case SOPT_GET: 1312 switch (sopt->sopt_name) { 1313 case IP_OPTIONS: 1314 case IP_RETOPTS: 1315 if (inp->inp_options) 1316 error = sooptcopyout(sopt, 1317 mtod(inp->inp_options, 1318 char *), 1319 inp->inp_options->m_len); 1320 else 1321 sopt->sopt_valsize = 0; 1322 break; 1323 1324 case IP_TOS: 1325 case IP_TTL: 1326 case IP_RECVOPTS: 1327 case IP_RECVRETOPTS: 1328 case IP_RECVDSTADDR: 1329 case IP_RECVTTL: 1330 case IP_RECVIF: 1331 case IP_PORTRANGE: 1332 case IP_FAITH: 1333 case IP_ONESBCAST: 1334 switch (sopt->sopt_name) { 1335 1336 case IP_TOS: 1337 optval = inp->inp_ip_tos; 1338 break; 1339 1340 case IP_TTL: 1341 optval = inp->inp_ip_ttl; 1342 break; 1343 1344 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1345 1346 case IP_RECVOPTS: 1347 optval = OPTBIT(INP_RECVOPTS); 1348 break; 1349 1350 case IP_RECVRETOPTS: 1351 optval = OPTBIT(INP_RECVRETOPTS); 1352 break; 1353 1354 case IP_RECVDSTADDR: 1355 optval = OPTBIT(INP_RECVDSTADDR); 1356 break; 1357 1358 case IP_RECVTTL: 1359 optval = OPTBIT(INP_RECVTTL); 1360 break; 1361 1362 case IP_RECVIF: 1363 optval = OPTBIT(INP_RECVIF); 1364 break; 1365 1366 case IP_PORTRANGE: 1367 if (inp->inp_flags & INP_HIGHPORT) 1368 optval = IP_PORTRANGE_HIGH; 1369 else if (inp->inp_flags & INP_LOWPORT) 1370 optval = IP_PORTRANGE_LOW; 1371 else 1372 optval = 0; 1373 break; 1374 1375 case IP_FAITH: 1376 optval = OPTBIT(INP_FAITH); 1377 break; 1378 1379 case IP_ONESBCAST: 1380 optval = OPTBIT(INP_ONESBCAST); 1381 break; 1382 } 1383 error = sooptcopyout(sopt, &optval, sizeof optval); 1384 break; 1385 1386 case IP_MULTICAST_IF: 1387 case IP_MULTICAST_VIF: 1388 case IP_MULTICAST_TTL: 1389 case IP_MULTICAST_LOOP: 1390 case IP_ADD_MEMBERSHIP: 1391 case IP_DROP_MEMBERSHIP: 1392 error = ip_getmoptions(sopt, inp->inp_moptions); 1393 break; 1394 1395 #if defined(IPSEC) || defined(FAST_IPSEC) 1396 case IP_IPSEC_POLICY: 1397 { 1398 struct mbuf *m = NULL; 1399 caddr_t req = NULL; 1400 size_t len = 0; 1401 1402 if (m != 0) { 1403 req = mtod(m, caddr_t); 1404 len = m->m_len; 1405 } 1406 error = ipsec4_get_policy(sotoinpcb(so), req, len, &m); 1407 if (error == 0) 1408 error = soopt_mcopyout(sopt, m); /* XXX */ 1409 if (error == 0) 1410 m_freem(m); 1411 break; 1412 } 1413 #endif /*IPSEC*/ 1414 1415 default: 1416 error = ENOPROTOOPT; 1417 break; 1418 } 1419 break; 1420 } 1421 return (error); 1422 } 1423 1424 /* 1425 * Set up IP options in pcb for insertion in output packets. 1426 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1427 * with destination address if source routed. 1428 */ 1429 static int 1430 ip_pcbopts(optname, pcbopt, m) 1431 int optname; 1432 struct mbuf **pcbopt; 1433 register struct mbuf *m; 1434 { 1435 register int cnt, optlen; 1436 register u_char *cp; 1437 u_char opt; 1438 1439 /* turn off any old options */ 1440 if (*pcbopt) 1441 (void)m_free(*pcbopt); 1442 *pcbopt = 0; 1443 if (m == (struct mbuf *)0 || m->m_len == 0) { 1444 /* 1445 * Only turning off any previous options. 1446 */ 1447 if (m) 1448 (void)m_free(m); 1449 return (0); 1450 } 1451 1452 if (m->m_len % sizeof(int32_t)) 1453 goto bad; 1454 /* 1455 * IP first-hop destination address will be stored before 1456 * actual options; move other options back 1457 * and clear it when none present. 1458 */ 1459 if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN]) 1460 goto bad; 1461 cnt = m->m_len; 1462 m->m_len += sizeof(struct in_addr); 1463 cp = mtod(m, u_char *) + sizeof(struct in_addr); 1464 bcopy(mtod(m, void *), cp, (unsigned)cnt); 1465 bzero(mtod(m, void *), sizeof(struct in_addr)); 1466 1467 for (; cnt > 0; cnt -= optlen, cp += optlen) { 1468 opt = cp[IPOPT_OPTVAL]; 1469 if (opt == IPOPT_EOL) 1470 break; 1471 if (opt == IPOPT_NOP) 1472 optlen = 1; 1473 else { 1474 if (cnt < IPOPT_OLEN + sizeof(*cp)) 1475 goto bad; 1476 optlen = cp[IPOPT_OLEN]; 1477 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) 1478 goto bad; 1479 } 1480 switch (opt) { 1481 1482 default: 1483 break; 1484 1485 case IPOPT_LSRR: 1486 case IPOPT_SSRR: 1487 /* 1488 * user process specifies route as: 1489 * ->A->B->C->D 1490 * D must be our final destination (but we can't 1491 * check that since we may not have connected yet). 1492 * A is first hop destination, which doesn't appear in 1493 * actual IP option, but is stored before the options. 1494 */ 1495 if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr)) 1496 goto bad; 1497 m->m_len -= sizeof(struct in_addr); 1498 cnt -= sizeof(struct in_addr); 1499 optlen -= sizeof(struct in_addr); 1500 cp[IPOPT_OLEN] = optlen; 1501 /* 1502 * Move first hop before start of options. 1503 */ 1504 bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t), 1505 sizeof(struct in_addr)); 1506 /* 1507 * Then copy rest of options back 1508 * to close up the deleted entry. 1509 */ 1510 bcopy((&cp[IPOPT_OFFSET+1] + sizeof(struct in_addr)), 1511 &cp[IPOPT_OFFSET+1], 1512 (unsigned)cnt - (IPOPT_MINOFF - 1)); 1513 break; 1514 } 1515 } 1516 if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr)) 1517 goto bad; 1518 *pcbopt = m; 1519 return (0); 1520 1521 bad: 1522 (void)m_free(m); 1523 return (EINVAL); 1524 } 1525 1526 /* 1527 * XXX 1528 * The whole multicast option thing needs to be re-thought. 1529 * Several of these options are equally applicable to non-multicast 1530 * transmission, and one (IP_MULTICAST_TTL) totally duplicates a 1531 * standard option (IP_TTL). 1532 */ 1533 1534 /* 1535 * following RFC1724 section 3.3, 0.0.0.0/8 is interpreted as interface index. 1536 */ 1537 static struct ifnet * 1538 ip_multicast_if(a, ifindexp) 1539 struct in_addr *a; 1540 int *ifindexp; 1541 { 1542 int ifindex; 1543 struct ifnet *ifp; 1544 1545 if (ifindexp) 1546 *ifindexp = 0; 1547 if (ntohl(a->s_addr) >> 24 == 0) { 1548 ifindex = ntohl(a->s_addr) & 0xffffff; 1549 if (ifindex < 0 || if_index < ifindex) 1550 return NULL; 1551 ifp = ifnet_byindex(ifindex); 1552 if (ifindexp) 1553 *ifindexp = ifindex; 1554 } else { 1555 INADDR_TO_IFP(*a, ifp); 1556 } 1557 return ifp; 1558 } 1559 1560 /* 1561 * Set the IP multicast options in response to user setsockopt(). 1562 */ 1563 static int 1564 ip_setmoptions(sopt, imop) 1565 struct sockopt *sopt; 1566 struct ip_moptions **imop; 1567 { 1568 int error = 0; 1569 int i; 1570 struct in_addr addr; 1571 struct ip_mreq mreq; 1572 struct ifnet *ifp; 1573 struct ip_moptions *imo = *imop; 1574 struct route ro; 1575 struct sockaddr_in *dst; 1576 int ifindex; 1577 int s; 1578 1579 if (imo == NULL) { 1580 /* 1581 * No multicast option buffer attached to the pcb; 1582 * allocate one and initialize to default values. 1583 */ 1584 imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS, 1585 M_WAITOK); 1586 1587 if (imo == NULL) 1588 return (ENOBUFS); 1589 *imop = imo; 1590 imo->imo_multicast_ifp = NULL; 1591 imo->imo_multicast_addr.s_addr = INADDR_ANY; 1592 imo->imo_multicast_vif = -1; 1593 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; 1594 imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP; 1595 imo->imo_num_memberships = 0; 1596 } 1597 1598 switch (sopt->sopt_name) { 1599 /* store an index number for the vif you wanna use in the send */ 1600 case IP_MULTICAST_VIF: 1601 if (legal_vif_num == 0) { 1602 error = EOPNOTSUPP; 1603 break; 1604 } 1605 error = sooptcopyin(sopt, &i, sizeof i, sizeof i); 1606 if (error) 1607 break; 1608 if (!legal_vif_num(i) && (i != -1)) { 1609 error = EINVAL; 1610 break; 1611 } 1612 imo->imo_multicast_vif = i; 1613 break; 1614 1615 case IP_MULTICAST_IF: 1616 /* 1617 * Select the interface for outgoing multicast packets. 1618 */ 1619 error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr); 1620 if (error) 1621 break; 1622 /* 1623 * INADDR_ANY is used to remove a previous selection. 1624 * When no interface is selected, a default one is 1625 * chosen every time a multicast packet is sent. 1626 */ 1627 if (addr.s_addr == INADDR_ANY) { 1628 imo->imo_multicast_ifp = NULL; 1629 break; 1630 } 1631 /* 1632 * The selected interface is identified by its local 1633 * IP address. Find the interface and confirm that 1634 * it supports multicasting. 1635 */ 1636 s = splimp(); 1637 ifp = ip_multicast_if(&addr, &ifindex); 1638 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1639 splx(s); 1640 error = EADDRNOTAVAIL; 1641 break; 1642 } 1643 imo->imo_multicast_ifp = ifp; 1644 if (ifindex) 1645 imo->imo_multicast_addr = addr; 1646 else 1647 imo->imo_multicast_addr.s_addr = INADDR_ANY; 1648 splx(s); 1649 break; 1650 1651 case IP_MULTICAST_TTL: 1652 /* 1653 * Set the IP time-to-live for outgoing multicast packets. 1654 * The original multicast API required a char argument, 1655 * which is inconsistent with the rest of the socket API. 1656 * We allow either a char or an int. 1657 */ 1658 if (sopt->sopt_valsize == 1) { 1659 u_char ttl; 1660 error = sooptcopyin(sopt, &ttl, 1, 1); 1661 if (error) 1662 break; 1663 imo->imo_multicast_ttl = ttl; 1664 } else { 1665 u_int ttl; 1666 error = sooptcopyin(sopt, &ttl, sizeof ttl, 1667 sizeof ttl); 1668 if (error) 1669 break; 1670 if (ttl > 255) 1671 error = EINVAL; 1672 else 1673 imo->imo_multicast_ttl = ttl; 1674 } 1675 break; 1676 1677 case IP_MULTICAST_LOOP: 1678 /* 1679 * Set the loopback flag for outgoing multicast packets. 1680 * Must be zero or one. The original multicast API required a 1681 * char argument, which is inconsistent with the rest 1682 * of the socket API. We allow either a char or an int. 1683 */ 1684 if (sopt->sopt_valsize == 1) { 1685 u_char loop; 1686 error = sooptcopyin(sopt, &loop, 1, 1); 1687 if (error) 1688 break; 1689 imo->imo_multicast_loop = !!loop; 1690 } else { 1691 u_int loop; 1692 error = sooptcopyin(sopt, &loop, sizeof loop, 1693 sizeof loop); 1694 if (error) 1695 break; 1696 imo->imo_multicast_loop = !!loop; 1697 } 1698 break; 1699 1700 case IP_ADD_MEMBERSHIP: 1701 /* 1702 * Add a multicast group membership. 1703 * Group must be a valid IP multicast address. 1704 */ 1705 error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq); 1706 if (error) 1707 break; 1708 1709 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) { 1710 error = EINVAL; 1711 break; 1712 } 1713 s = splimp(); 1714 /* 1715 * If no interface address was provided, use the interface of 1716 * the route to the given multicast address. 1717 */ 1718 if (mreq.imr_interface.s_addr == INADDR_ANY) { 1719 bzero((caddr_t)&ro, sizeof(ro)); 1720 dst = (struct sockaddr_in *)&ro.ro_dst; 1721 dst->sin_len = sizeof(*dst); 1722 dst->sin_family = AF_INET; 1723 dst->sin_addr = mreq.imr_multiaddr; 1724 rtalloc_ign(&ro, RTF_CLONING); 1725 if (ro.ro_rt == NULL) { 1726 error = EADDRNOTAVAIL; 1727 splx(s); 1728 break; 1729 } 1730 ifp = ro.ro_rt->rt_ifp; 1731 RTFREE(ro.ro_rt); 1732 } 1733 else { 1734 ifp = ip_multicast_if(&mreq.imr_interface, NULL); 1735 } 1736 1737 /* 1738 * See if we found an interface, and confirm that it 1739 * supports multicast. 1740 */ 1741 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1742 error = EADDRNOTAVAIL; 1743 splx(s); 1744 break; 1745 } 1746 /* 1747 * See if the membership already exists or if all the 1748 * membership slots are full. 1749 */ 1750 for (i = 0; i < imo->imo_num_memberships; ++i) { 1751 if (imo->imo_membership[i]->inm_ifp == ifp && 1752 imo->imo_membership[i]->inm_addr.s_addr 1753 == mreq.imr_multiaddr.s_addr) 1754 break; 1755 } 1756 if (i < imo->imo_num_memberships) { 1757 error = EADDRINUSE; 1758 splx(s); 1759 break; 1760 } 1761 if (i == IP_MAX_MEMBERSHIPS) { 1762 error = ETOOMANYREFS; 1763 splx(s); 1764 break; 1765 } 1766 /* 1767 * Everything looks good; add a new record to the multicast 1768 * address list for the given interface. 1769 */ 1770 if ((imo->imo_membership[i] = 1771 in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) { 1772 error = ENOBUFS; 1773 splx(s); 1774 break; 1775 } 1776 ++imo->imo_num_memberships; 1777 splx(s); 1778 break; 1779 1780 case IP_DROP_MEMBERSHIP: 1781 /* 1782 * Drop a multicast group membership. 1783 * Group must be a valid IP multicast address. 1784 */ 1785 error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq); 1786 if (error) 1787 break; 1788 1789 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) { 1790 error = EINVAL; 1791 break; 1792 } 1793 1794 s = splimp(); 1795 /* 1796 * If an interface address was specified, get a pointer 1797 * to its ifnet structure. 1798 */ 1799 if (mreq.imr_interface.s_addr == INADDR_ANY) 1800 ifp = NULL; 1801 else { 1802 ifp = ip_multicast_if(&mreq.imr_interface, NULL); 1803 if (ifp == NULL) { 1804 error = EADDRNOTAVAIL; 1805 splx(s); 1806 break; 1807 } 1808 } 1809 /* 1810 * Find the membership in the membership array. 1811 */ 1812 for (i = 0; i < imo->imo_num_memberships; ++i) { 1813 if ((ifp == NULL || 1814 imo->imo_membership[i]->inm_ifp == ifp) && 1815 imo->imo_membership[i]->inm_addr.s_addr == 1816 mreq.imr_multiaddr.s_addr) 1817 break; 1818 } 1819 if (i == imo->imo_num_memberships) { 1820 error = EADDRNOTAVAIL; 1821 splx(s); 1822 break; 1823 } 1824 /* 1825 * Give up the multicast address record to which the 1826 * membership points. 1827 */ 1828 in_delmulti(imo->imo_membership[i]); 1829 /* 1830 * Remove the gap in the membership array. 1831 */ 1832 for (++i; i < imo->imo_num_memberships; ++i) 1833 imo->imo_membership[i-1] = imo->imo_membership[i]; 1834 --imo->imo_num_memberships; 1835 splx(s); 1836 break; 1837 1838 default: 1839 error = EOPNOTSUPP; 1840 break; 1841 } 1842 1843 /* 1844 * If all options have default values, no need to keep the mbuf. 1845 */ 1846 if (imo->imo_multicast_ifp == NULL && 1847 imo->imo_multicast_vif == -1 && 1848 imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && 1849 imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && 1850 imo->imo_num_memberships == 0) { 1851 free(*imop, M_IPMOPTS); 1852 *imop = NULL; 1853 } 1854 1855 return (error); 1856 } 1857 1858 /* 1859 * Return the IP multicast options in response to user getsockopt(). 1860 */ 1861 static int 1862 ip_getmoptions(sopt, imo) 1863 struct sockopt *sopt; 1864 register struct ip_moptions *imo; 1865 { 1866 struct in_addr addr; 1867 struct in_ifaddr *ia; 1868 int error, optval; 1869 u_char coptval; 1870 1871 error = 0; 1872 switch (sopt->sopt_name) { 1873 case IP_MULTICAST_VIF: 1874 if (imo != NULL) 1875 optval = imo->imo_multicast_vif; 1876 else 1877 optval = -1; 1878 error = sooptcopyout(sopt, &optval, sizeof optval); 1879 break; 1880 1881 case IP_MULTICAST_IF: 1882 if (imo == NULL || imo->imo_multicast_ifp == NULL) 1883 addr.s_addr = INADDR_ANY; 1884 else if (imo->imo_multicast_addr.s_addr) { 1885 /* return the value user has set */ 1886 addr = imo->imo_multicast_addr; 1887 } else { 1888 IFP_TO_IA(imo->imo_multicast_ifp, ia); 1889 addr.s_addr = (ia == NULL) ? INADDR_ANY 1890 : IA_SIN(ia)->sin_addr.s_addr; 1891 } 1892 error = sooptcopyout(sopt, &addr, sizeof addr); 1893 break; 1894 1895 case IP_MULTICAST_TTL: 1896 if (imo == 0) 1897 optval = coptval = IP_DEFAULT_MULTICAST_TTL; 1898 else 1899 optval = coptval = imo->imo_multicast_ttl; 1900 if (sopt->sopt_valsize == 1) 1901 error = sooptcopyout(sopt, &coptval, 1); 1902 else 1903 error = sooptcopyout(sopt, &optval, sizeof optval); 1904 break; 1905 1906 case IP_MULTICAST_LOOP: 1907 if (imo == 0) 1908 optval = coptval = IP_DEFAULT_MULTICAST_LOOP; 1909 else 1910 optval = coptval = imo->imo_multicast_loop; 1911 if (sopt->sopt_valsize == 1) 1912 error = sooptcopyout(sopt, &coptval, 1); 1913 else 1914 error = sooptcopyout(sopt, &optval, sizeof optval); 1915 break; 1916 1917 default: 1918 error = ENOPROTOOPT; 1919 break; 1920 } 1921 return (error); 1922 } 1923 1924 /* 1925 * Discard the IP multicast options. 1926 */ 1927 void 1928 ip_freemoptions(imo) 1929 register struct ip_moptions *imo; 1930 { 1931 register int i; 1932 1933 if (imo != NULL) { 1934 for (i = 0; i < imo->imo_num_memberships; ++i) 1935 in_delmulti(imo->imo_membership[i]); 1936 free(imo, M_IPMOPTS); 1937 } 1938 } 1939 1940 /* 1941 * Routine called from ip_output() to loop back a copy of an IP multicast 1942 * packet to the input queue of a specified interface. Note that this 1943 * calls the output routine of the loopback "driver", but with an interface 1944 * pointer that might NOT be a loopback interface -- evil, but easier than 1945 * replicating that code here. 1946 */ 1947 static void 1948 ip_mloopback(ifp, m, dst, hlen) 1949 struct ifnet *ifp; 1950 register struct mbuf *m; 1951 register struct sockaddr_in *dst; 1952 int hlen; 1953 { 1954 register struct ip *ip; 1955 struct mbuf *copym; 1956 1957 copym = m_copy(m, 0, M_COPYALL); 1958 if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen)) 1959 copym = m_pullup(copym, hlen); 1960 if (copym != NULL) { 1961 /* If needed, compute the checksum and mark it as valid. */ 1962 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1963 in_delayed_cksum(copym); 1964 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1965 copym->m_pkthdr.csum_flags |= 1966 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1967 copym->m_pkthdr.csum_data = 0xffff; 1968 } 1969 /* 1970 * We don't bother to fragment if the IP length is greater 1971 * than the interface's MTU. Can this possibly matter? 1972 */ 1973 ip = mtod(copym, struct ip *); 1974 ip->ip_len = htons(ip->ip_len); 1975 ip->ip_off = htons(ip->ip_off); 1976 ip->ip_sum = 0; 1977 ip->ip_sum = in_cksum(copym, hlen); 1978 /* 1979 * NB: 1980 * It's not clear whether there are any lingering 1981 * reentrancy problems in other areas which might 1982 * be exposed by using ip_input directly (in 1983 * particular, everything which modifies the packet 1984 * in-place). Yet another option is using the 1985 * protosw directly to deliver the looped back 1986 * packet. For the moment, we'll err on the side 1987 * of safety by using if_simloop(). 1988 */ 1989 #if 1 /* XXX */ 1990 if (dst->sin_family != AF_INET) { 1991 printf("ip_mloopback: bad address family %d\n", 1992 dst->sin_family); 1993 dst->sin_family = AF_INET; 1994 } 1995 #endif 1996 1997 #ifdef notdef 1998 copym->m_pkthdr.rcvif = ifp; 1999 ip_input(copym); 2000 #else 2001 if_simloop(ifp, copym, dst->sin_family, 0); 2002 #endif 2003 } 2004 }
Cache object: 122f7629503508de377f2fdc14e0d5c3
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