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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 * 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_output.c 8.3 (Berkeley) 1/21/94 34 * $FreeBSD: releng/5.0/sys/netinet/ip_output.c 107112 2002-11-20 18:56:25Z luigi $ 35 */ 36 37 #include "opt_ipfw.h" 38 #include "opt_ipdn.h" 39 #include "opt_ipdivert.h" 40 #include "opt_ipfilter.h" 41 #include "opt_ipsec.h" 42 #include "opt_mac.h" 43 #include "opt_pfil_hooks.h" 44 #include "opt_random_ip_id.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/mac.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/protosw.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 56 #include <net/if.h> 57 #include <net/route.h> 58 59 #include <netinet/in.h> 60 #include <netinet/in_systm.h> 61 #include <netinet/ip.h> 62 #include <netinet/in_pcb.h> 63 #include <netinet/in_var.h> 64 #include <netinet/ip_var.h> 65 66 #include <machine/in_cksum.h> 67 68 static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options"); 69 70 #ifdef IPSEC 71 #include <netinet6/ipsec.h> 72 #include <netkey/key.h> 73 #ifdef IPSEC_DEBUG 74 #include <netkey/key_debug.h> 75 #else 76 #define KEYDEBUG(lev,arg) 77 #endif 78 #endif /*IPSEC*/ 79 80 #ifdef FAST_IPSEC 81 #include <netipsec/ipsec.h> 82 #include <netipsec/xform.h> 83 #include <netipsec/key.h> 84 #endif /*FAST_IPSEC*/ 85 86 #include <netinet/ip_fw.h> 87 #include <netinet/ip_dummynet.h> 88 89 #define print_ip(x, a, y) printf("%s %d.%d.%d.%d%s",\ 90 x, (ntohl(a.s_addr)>>24)&0xFF,\ 91 (ntohl(a.s_addr)>>16)&0xFF,\ 92 (ntohl(a.s_addr)>>8)&0xFF,\ 93 (ntohl(a.s_addr))&0xFF, y); 94 95 u_short ip_id; 96 97 static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *); 98 static struct ifnet *ip_multicast_if(struct in_addr *, int *); 99 static void ip_mloopback 100 (struct ifnet *, struct mbuf *, struct sockaddr_in *, int); 101 static int ip_getmoptions 102 (struct sockopt *, struct ip_moptions *); 103 static int ip_pcbopts(int, struct mbuf **, struct mbuf *); 104 static int ip_setmoptions 105 (struct sockopt *, struct ip_moptions **); 106 107 int ip_optcopy(struct ip *, struct ip *); 108 109 110 extern struct protosw inetsw[]; 111 112 /* 113 * IP output. The packet in mbuf chain m contains a skeletal IP 114 * header (with len, off, ttl, proto, tos, src, dst). 115 * The mbuf chain containing the packet will be freed. 116 * The mbuf opt, if present, will not be freed. 117 */ 118 int 119 ip_output(m0, opt, ro, flags, imo, inp) 120 struct mbuf *m0; 121 struct mbuf *opt; 122 struct route *ro; 123 int flags; 124 struct ip_moptions *imo; 125 struct inpcb *inp; 126 { 127 struct ip *ip, *mhip; 128 struct ifnet *ifp = NULL; /* keep compiler happy */ 129 struct mbuf *m; 130 int hlen = sizeof (struct ip); 131 int len, off, error = 0; 132 struct sockaddr_in *dst = NULL; /* keep compiler happy */ 133 struct in_ifaddr *ia = NULL; 134 int isbroadcast, sw_csum; 135 struct in_addr pkt_dst; 136 #ifdef IPSEC 137 struct route iproute; 138 struct secpolicy *sp = NULL; 139 struct socket *so = inp ? inp->inp_socket : NULL; 140 #endif 141 #ifdef FAST_IPSEC 142 struct route iproute; 143 struct m_tag *mtag; 144 struct secpolicy *sp = NULL; 145 struct tdb_ident *tdbi; 146 int s; 147 #endif /* FAST_IPSEC */ 148 struct ip_fw_args args; 149 int src_was_INADDR_ANY = 0; /* as the name says... */ 150 #ifdef PFIL_HOOKS 151 struct packet_filter_hook *pfh; 152 struct mbuf *m1; 153 int rv; 154 #endif /* PFIL_HOOKS */ 155 156 args.eh = NULL; 157 args.rule = NULL; 158 args.next_hop = NULL; 159 args.divert_rule = 0; /* divert cookie */ 160 161 /* Grab info from MT_TAG mbufs prepended to the chain. */ 162 for (; m0 && m0->m_type == MT_TAG; m0 = m0->m_next) { 163 switch(m0->_m_tag_id) { 164 default: 165 printf("ip_output: unrecognised MT_TAG tag %d\n", 166 m0->_m_tag_id); 167 break; 168 169 case PACKET_TAG_DUMMYNET: 170 /* 171 * the packet was already tagged, so part of the 172 * processing was already done, and we need to go down. 173 * Get parameters from the header. 174 */ 175 args.rule = ((struct dn_pkt *)m0)->rule; 176 opt = NULL ; 177 ro = & ( ((struct dn_pkt *)m0)->ro ) ; 178 imo = NULL ; 179 dst = ((struct dn_pkt *)m0)->dn_dst ; 180 ifp = ((struct dn_pkt *)m0)->ifp ; 181 flags = ((struct dn_pkt *)m0)->flags ; 182 break; 183 184 case PACKET_TAG_DIVERT: 185 args.divert_rule = (intptr_t)m0->m_data & 0xffff; 186 break; 187 188 case PACKET_TAG_IPFORWARD: 189 args.next_hop = (struct sockaddr_in *)m0->m_data; 190 break; 191 } 192 } 193 m = m0; 194 195 KASSERT(!m || (m->m_flags & M_PKTHDR) != 0, ("ip_output: no HDR")); 196 #ifndef FAST_IPSEC 197 KASSERT(ro != NULL, ("ip_output: no route, proto %d", 198 mtod(m, struct ip *)->ip_p)); 199 #endif 200 201 if (args.rule != NULL) { /* dummynet already saw us */ 202 ip = mtod(m, struct ip *); 203 hlen = ip->ip_hl << 2 ; 204 if (ro->ro_rt) 205 ia = ifatoia(ro->ro_rt->rt_ifa); 206 goto sendit; 207 } 208 209 if (opt) { 210 len = 0; 211 m = ip_insertoptions(m, opt, &len); 212 if (len != 0) 213 hlen = len; 214 } 215 ip = mtod(m, struct ip *); 216 pkt_dst = args.next_hop ? args.next_hop->sin_addr : ip->ip_dst; 217 218 /* 219 * Fill in IP header. 220 */ 221 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 222 ip->ip_v = IPVERSION; 223 ip->ip_hl = hlen >> 2; 224 ip->ip_off &= IP_DF; 225 #ifdef RANDOM_IP_ID 226 ip->ip_id = ip_randomid(); 227 #else 228 ip->ip_id = htons(ip_id++); 229 #endif 230 ipstat.ips_localout++; 231 } else { 232 hlen = ip->ip_hl << 2; 233 } 234 235 #ifdef FAST_IPSEC 236 if (ro == NULL) { 237 ro = &iproute; 238 bzero(ro, sizeof (*ro)); 239 } 240 #endif /* FAST_IPSEC */ 241 dst = (struct sockaddr_in *)&ro->ro_dst; 242 /* 243 * If there is a cached route, 244 * check that it is to the same destination 245 * and is still up. If not, free it and try again. 246 * The address family should also be checked in case of sharing the 247 * cache with IPv6. 248 */ 249 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 250 dst->sin_family != AF_INET || 251 dst->sin_addr.s_addr != pkt_dst.s_addr)) { 252 RTFREE(ro->ro_rt); 253 ro->ro_rt = (struct rtentry *)0; 254 } 255 if (ro->ro_rt == 0) { 256 bzero(dst, sizeof(*dst)); 257 dst->sin_family = AF_INET; 258 dst->sin_len = sizeof(*dst); 259 dst->sin_addr = pkt_dst; 260 } 261 /* 262 * If routing to interface only, 263 * short circuit routing lookup. 264 */ 265 if (flags & IP_ROUTETOIF) { 266 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 && 267 (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) { 268 ipstat.ips_noroute++; 269 error = ENETUNREACH; 270 goto bad; 271 } 272 ifp = ia->ia_ifp; 273 ip->ip_ttl = 1; 274 isbroadcast = in_broadcast(dst->sin_addr, ifp); 275 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 276 imo != NULL && imo->imo_multicast_ifp != NULL) { 277 /* 278 * Bypass the normal routing lookup for multicast 279 * packets if the interface is specified. 280 */ 281 ifp = imo->imo_multicast_ifp; 282 IFP_TO_IA(ifp, ia); 283 isbroadcast = 0; /* fool gcc */ 284 } else { 285 /* 286 * If this is the case, we probably don't want to allocate 287 * a protocol-cloned route since we didn't get one from the 288 * ULP. This lets TCP do its thing, while not burdening 289 * forwarding or ICMP with the overhead of cloning a route. 290 * Of course, we still want to do any cloning requested by 291 * the link layer, as this is probably required in all cases 292 * for correct operation (as it is for ARP). 293 */ 294 if (ro->ro_rt == 0) 295 rtalloc_ign(ro, RTF_PRCLONING); 296 if (ro->ro_rt == 0) { 297 ipstat.ips_noroute++; 298 error = EHOSTUNREACH; 299 goto bad; 300 } 301 ia = ifatoia(ro->ro_rt->rt_ifa); 302 ifp = ro->ro_rt->rt_ifp; 303 ro->ro_rt->rt_use++; 304 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 305 dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 306 if (ro->ro_rt->rt_flags & RTF_HOST) 307 isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST); 308 else 309 isbroadcast = in_broadcast(dst->sin_addr, ifp); 310 } 311 if (IN_MULTICAST(ntohl(pkt_dst.s_addr))) { 312 struct in_multi *inm; 313 314 m->m_flags |= M_MCAST; 315 /* 316 * IP destination address is multicast. Make sure "dst" 317 * still points to the address in "ro". (It may have been 318 * changed to point to a gateway address, above.) 319 */ 320 dst = (struct sockaddr_in *)&ro->ro_dst; 321 /* 322 * See if the caller provided any multicast options 323 */ 324 if (imo != NULL) { 325 ip->ip_ttl = imo->imo_multicast_ttl; 326 if (imo->imo_multicast_vif != -1) 327 ip->ip_src.s_addr = 328 ip_mcast_src ? 329 ip_mcast_src(imo->imo_multicast_vif) : 330 INADDR_ANY; 331 } else 332 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 333 /* 334 * Confirm that the outgoing interface supports multicast. 335 */ 336 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 337 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 338 ipstat.ips_noroute++; 339 error = ENETUNREACH; 340 goto bad; 341 } 342 } 343 /* 344 * If source address not specified yet, use address 345 * of outgoing interface. 346 */ 347 if (ip->ip_src.s_addr == INADDR_ANY) { 348 /* Interface may have no addresses. */ 349 if (ia != NULL) 350 ip->ip_src = IA_SIN(ia)->sin_addr; 351 } 352 353 if (ip_mrouter && (flags & IP_FORWARDING) == 0) { 354 /* 355 * XXX 356 * delayed checksums are not currently 357 * compatible with IP multicast routing 358 */ 359 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 360 in_delayed_cksum(m); 361 m->m_pkthdr.csum_flags &= 362 ~CSUM_DELAY_DATA; 363 } 364 } 365 IN_LOOKUP_MULTI(pkt_dst, ifp, inm); 366 if (inm != NULL && 367 (imo == NULL || imo->imo_multicast_loop)) { 368 /* 369 * If we belong to the destination multicast group 370 * on the outgoing interface, and the caller did not 371 * forbid loopback, loop back a copy. 372 */ 373 ip_mloopback(ifp, m, dst, hlen); 374 } 375 else { 376 /* 377 * If we are acting as a multicast router, perform 378 * multicast forwarding as if the packet had just 379 * arrived on the interface to which we are about 380 * to send. The multicast forwarding function 381 * recursively calls this function, using the 382 * IP_FORWARDING flag to prevent infinite recursion. 383 * 384 * Multicasts that are looped back by ip_mloopback(), 385 * above, will be forwarded by the ip_input() routine, 386 * if necessary. 387 */ 388 if (ip_mrouter && (flags & IP_FORWARDING) == 0) { 389 /* 390 * If rsvp daemon is not running, do not 391 * set ip_moptions. This ensures that the packet 392 * is multicast and not just sent down one link 393 * as prescribed by rsvpd. 394 */ 395 if (!rsvp_on) 396 imo = NULL; 397 if (ip_mforward && 398 ip_mforward(ip, ifp, m, imo) != 0) { 399 m_freem(m); 400 goto done; 401 } 402 } 403 } 404 405 /* 406 * Multicasts with a time-to-live of zero may be looped- 407 * back, above, but must not be transmitted on a network. 408 * Also, multicasts addressed to the loopback interface 409 * are not sent -- the above call to ip_mloopback() will 410 * loop back a copy if this host actually belongs to the 411 * destination group on the loopback interface. 412 */ 413 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 414 m_freem(m); 415 goto done; 416 } 417 418 goto sendit; 419 } 420 #ifndef notdef 421 /* 422 * If the source address is not specified yet, use the address 423 * of the outoing interface. In case, keep note we did that, so 424 * if the the firewall changes the next-hop causing the output 425 * interface to change, we can fix that. 426 */ 427 if (ip->ip_src.s_addr == INADDR_ANY) { 428 /* Interface may have no addresses. */ 429 if (ia != NULL) { 430 ip->ip_src = IA_SIN(ia)->sin_addr; 431 src_was_INADDR_ANY = 1; 432 } 433 } 434 #endif /* notdef */ 435 /* 436 * Verify that we have any chance at all of being able to queue 437 * the packet or packet fragments 438 */ 439 if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >= 440 ifp->if_snd.ifq_maxlen) { 441 error = ENOBUFS; 442 ipstat.ips_odropped++; 443 goto bad; 444 } 445 446 /* 447 * Look for broadcast address and 448 * verify user is allowed to send 449 * such a packet. 450 */ 451 if (isbroadcast) { 452 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 453 error = EADDRNOTAVAIL; 454 goto bad; 455 } 456 if ((flags & IP_ALLOWBROADCAST) == 0) { 457 error = EACCES; 458 goto bad; 459 } 460 /* don't allow broadcast messages to be fragmented */ 461 if ((u_short)ip->ip_len > ifp->if_mtu) { 462 error = EMSGSIZE; 463 goto bad; 464 } 465 m->m_flags |= M_BCAST; 466 } else { 467 m->m_flags &= ~M_BCAST; 468 } 469 470 sendit: 471 #ifdef IPSEC 472 /* get SP for this packet */ 473 if (so == NULL) 474 sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, flags, &error); 475 else 476 sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 477 478 if (sp == NULL) { 479 ipsecstat.out_inval++; 480 goto bad; 481 } 482 483 error = 0; 484 485 /* check policy */ 486 switch (sp->policy) { 487 case IPSEC_POLICY_DISCARD: 488 /* 489 * This packet is just discarded. 490 */ 491 ipsecstat.out_polvio++; 492 goto bad; 493 494 case IPSEC_POLICY_BYPASS: 495 case IPSEC_POLICY_NONE: 496 /* no need to do IPsec. */ 497 goto skip_ipsec; 498 499 case IPSEC_POLICY_IPSEC: 500 if (sp->req == NULL) { 501 /* acquire a policy */ 502 error = key_spdacquire(sp); 503 goto bad; 504 } 505 break; 506 507 case IPSEC_POLICY_ENTRUST: 508 default: 509 printf("ip_output: Invalid policy found. %d\n", sp->policy); 510 } 511 { 512 struct ipsec_output_state state; 513 bzero(&state, sizeof(state)); 514 state.m = m; 515 if (flags & IP_ROUTETOIF) { 516 state.ro = &iproute; 517 bzero(&iproute, sizeof(iproute)); 518 } else 519 state.ro = ro; 520 state.dst = (struct sockaddr *)dst; 521 522 ip->ip_sum = 0; 523 524 /* 525 * XXX 526 * delayed checksums are not currently compatible with IPsec 527 */ 528 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 529 in_delayed_cksum(m); 530 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 531 } 532 533 ip->ip_len = htons(ip->ip_len); 534 ip->ip_off = htons(ip->ip_off); 535 536 error = ipsec4_output(&state, sp, flags); 537 538 m = state.m; 539 if (flags & IP_ROUTETOIF) { 540 /* 541 * if we have tunnel mode SA, we may need to ignore 542 * IP_ROUTETOIF. 543 */ 544 if (state.ro != &iproute || state.ro->ro_rt != NULL) { 545 flags &= ~IP_ROUTETOIF; 546 ro = state.ro; 547 } 548 } else 549 ro = state.ro; 550 dst = (struct sockaddr_in *)state.dst; 551 if (error) { 552 /* mbuf is already reclaimed in ipsec4_output. */ 553 m0 = NULL; 554 switch (error) { 555 case EHOSTUNREACH: 556 case ENETUNREACH: 557 case EMSGSIZE: 558 case ENOBUFS: 559 case ENOMEM: 560 break; 561 default: 562 printf("ip4_output (ipsec): error code %d\n", error); 563 /*fall through*/ 564 case ENOENT: 565 /* don't show these error codes to the user */ 566 error = 0; 567 break; 568 } 569 goto bad; 570 } 571 } 572 573 /* be sure to update variables that are affected by ipsec4_output() */ 574 ip = mtod(m, struct ip *); 575 hlen = ip->ip_hl << 2; 576 if (ro->ro_rt == NULL) { 577 if ((flags & IP_ROUTETOIF) == 0) { 578 printf("ip_output: " 579 "can't update route after IPsec processing\n"); 580 error = EHOSTUNREACH; /*XXX*/ 581 goto bad; 582 } 583 } else { 584 ia = ifatoia(ro->ro_rt->rt_ifa); 585 ifp = ro->ro_rt->rt_ifp; 586 } 587 588 /* make it flipped, again. */ 589 ip->ip_len = ntohs(ip->ip_len); 590 ip->ip_off = ntohs(ip->ip_off); 591 skip_ipsec: 592 #endif /*IPSEC*/ 593 #ifdef FAST_IPSEC 594 /* 595 * Check the security policy (SP) for the packet and, if 596 * required, do IPsec-related processing. There are two 597 * cases here; the first time a packet is sent through 598 * it will be untagged and handled by ipsec4_checkpolicy. 599 * If the packet is resubmitted to ip_output (e.g. after 600 * AH, ESP, etc. processing), there will be a tag to bypass 601 * the lookup and related policy checking. 602 */ 603 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 604 s = splnet(); 605 if (mtag != NULL) { 606 tdbi = (struct tdb_ident *)(mtag + 1); 607 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND); 608 if (sp == NULL) 609 error = -EINVAL; /* force silent drop */ 610 m_tag_delete(m, mtag); 611 } else { 612 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, 613 &error, inp); 614 } 615 /* 616 * There are four return cases: 617 * sp != NULL apply IPsec policy 618 * sp == NULL, error == 0 no IPsec handling needed 619 * sp == NULL, error == -EINVAL discard packet w/o error 620 * sp == NULL, error != 0 discard packet, report error 621 */ 622 if (sp != NULL) { 623 /* Loop detection, check if ipsec processing already done */ 624 KASSERT(sp->req != NULL, ("ip_output: no ipsec request")); 625 for (mtag = m_tag_first(m); mtag != NULL; 626 mtag = m_tag_next(m, mtag)) { 627 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT) 628 continue; 629 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE && 630 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED) 631 continue; 632 /* 633 * Check if policy has an SA associated with it. 634 * This can happen when an SP has yet to acquire 635 * an SA; e.g. on first reference. If it occurs, 636 * then we let ipsec4_process_packet do its thing. 637 */ 638 if (sp->req->sav == NULL) 639 break; 640 tdbi = (struct tdb_ident *)(mtag + 1); 641 if (tdbi->spi == sp->req->sav->spi && 642 tdbi->proto == sp->req->sav->sah->saidx.proto && 643 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst, 644 sizeof (union sockaddr_union)) == 0) { 645 /* 646 * No IPsec processing is needed, free 647 * reference to SP. 648 * 649 * NB: null pointer to avoid free at 650 * done: below. 651 */ 652 KEY_FREESP(&sp), sp = NULL; 653 splx(s); 654 goto spd_done; 655 } 656 } 657 658 /* 659 * Do delayed checksums now because we send before 660 * this is done in the normal processing path. 661 */ 662 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 663 in_delayed_cksum(m); 664 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 665 } 666 667 ip->ip_len = htons(ip->ip_len); 668 ip->ip_off = htons(ip->ip_off); 669 670 /* NB: callee frees mbuf */ 671 error = ipsec4_process_packet(m, sp->req, flags, 0); 672 splx(s); 673 goto done; 674 } else { 675 splx(s); 676 677 if (error != 0) { 678 /* 679 * Hack: -EINVAL is used to signal that a packet 680 * should be silently discarded. This is typically 681 * because we asked key management for an SA and 682 * it was delayed (e.g. kicked up to IKE). 683 */ 684 if (error == -EINVAL) 685 error = 0; 686 goto bad; 687 } else { 688 /* No IPsec processing for this packet. */ 689 } 690 #ifdef notyet 691 /* 692 * If deferred crypto processing is needed, check that 693 * the interface supports it. 694 */ 695 mtag = m_tag_find(m, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL); 696 if (mtag != NULL && (ifp->if_capenable & IFCAP_IPSEC) == 0) { 697 /* notify IPsec to do its own crypto */ 698 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 699 error = EHOSTUNREACH; 700 goto bad; 701 } 702 #endif 703 } 704 spd_done: 705 #endif /* FAST_IPSEC */ 706 707 /* 708 * IpHack's section. 709 * - Xlate: translate packet's addr/port (NAT). 710 * - Firewall: deny/allow/etc. 711 * - Wrap: fake packet's addr/port <unimpl.> 712 * - Encapsulate: put it in another IP and send out. <unimp.> 713 */ 714 #ifdef PFIL_HOOKS 715 /* 716 * Run through list of hooks for output packets. 717 */ 718 m1 = m; 719 pfh = pfil_hook_get(PFIL_OUT, &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 720 for (; pfh; pfh = TAILQ_NEXT(pfh, pfil_link)) 721 if (pfh->pfil_func) { 722 rv = pfh->pfil_func(ip, hlen, ifp, 1, &m1); 723 if (rv) { 724 error = EHOSTUNREACH; 725 goto done; 726 } 727 m = m1; 728 if (m == NULL) 729 goto done; 730 ip = mtod(m, struct ip *); 731 } 732 #endif /* PFIL_HOOKS */ 733 734 /* 735 * Check with the firewall... 736 * but not if we are already being fwd'd from a firewall. 737 */ 738 if (fw_enable && IPFW_LOADED && !args.next_hop) { 739 struct sockaddr_in *old = dst; 740 741 args.m = m; 742 args.next_hop = dst; 743 args.oif = ifp; 744 off = ip_fw_chk_ptr(&args); 745 m = args.m; 746 dst = args.next_hop; 747 748 /* 749 * On return we must do the following: 750 * m == NULL -> drop the pkt (old interface, deprecated) 751 * (off & IP_FW_PORT_DENY_FLAG) -> drop the pkt (new interface) 752 * 1<=off<= 0xffff -> DIVERT 753 * (off & IP_FW_PORT_DYNT_FLAG) -> send to a DUMMYNET pipe 754 * (off & IP_FW_PORT_TEE_FLAG) -> TEE the packet 755 * dst != old -> IPFIREWALL_FORWARD 756 * off==0, dst==old -> accept 757 * If some of the above modules are not compiled in, then 758 * we should't have to check the corresponding condition 759 * (because the ipfw control socket should not accept 760 * unsupported rules), but better play safe and drop 761 * packets in case of doubt. 762 */ 763 if ( (off & IP_FW_PORT_DENY_FLAG) || m == NULL) { 764 if (m) 765 m_freem(m); 766 error = EACCES; 767 goto done; 768 } 769 ip = mtod(m, struct ip *); 770 if (off == 0 && dst == old) /* common case */ 771 goto pass; 772 if (DUMMYNET_LOADED && (off & IP_FW_PORT_DYNT_FLAG) != 0) { 773 /* 774 * pass the pkt to dummynet. Need to include 775 * pipe number, m, ifp, ro, dst because these are 776 * not recomputed in the next pass. 777 * All other parameters have been already used and 778 * so they are not needed anymore. 779 * XXX note: if the ifp or ro entry are deleted 780 * while a pkt is in dummynet, we are in trouble! 781 */ 782 args.ro = ro; 783 args.dst = dst; 784 args.flags = flags; 785 786 error = ip_dn_io_ptr(m, off & 0xffff, DN_TO_IP_OUT, 787 &args); 788 goto done; 789 } 790 #ifdef IPDIVERT 791 if (off != 0 && (off & IP_FW_PORT_DYNT_FLAG) == 0) { 792 struct mbuf *clone = NULL; 793 794 /* Clone packet if we're doing a 'tee' */ 795 if ((off & IP_FW_PORT_TEE_FLAG) != 0) 796 clone = m_dup(m, M_DONTWAIT); 797 798 /* 799 * XXX 800 * delayed checksums are not currently compatible 801 * with divert sockets. 802 */ 803 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 804 in_delayed_cksum(m); 805 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 806 } 807 808 /* Restore packet header fields to original values */ 809 ip->ip_len = htons(ip->ip_len); 810 ip->ip_off = htons(ip->ip_off); 811 812 /* Deliver packet to divert input routine */ 813 divert_packet(m, 0, off & 0xffff, args.divert_rule); 814 815 /* If 'tee', continue with original packet */ 816 if (clone != NULL) { 817 m = clone; 818 ip = mtod(m, struct ip *); 819 goto pass; 820 } 821 goto done; 822 } 823 #endif 824 825 /* IPFIREWALL_FORWARD */ 826 /* 827 * Check dst to make sure it is directly reachable on the 828 * interface we previously thought it was. 829 * If it isn't (which may be likely in some situations) we have 830 * to re-route it (ie, find a route for the next-hop and the 831 * associated interface) and set them here. This is nested 832 * forwarding which in most cases is undesirable, except where 833 * such control is nigh impossible. So we do it here. 834 * And I'm babbling. 835 */ 836 if (off == 0 && old != dst) { /* FORWARD, dst has changed */ 837 #if 0 838 /* 839 * XXX To improve readability, this block should be 840 * changed into a function call as below: 841 */ 842 error = ip_ipforward(&m, &dst, &ifp); 843 if (error) 844 goto bad; 845 if (m == NULL) /* ip_input consumed the mbuf */ 846 goto done; 847 #else 848 struct in_ifaddr *ia; 849 850 /* 851 * XXX sro_fwd below is static, and a pointer 852 * to it gets passed to routines downstream. 853 * This could have surprisingly bad results in 854 * practice, because its content is overwritten 855 * by subsequent packets. 856 */ 857 /* There must be a better way to do this next line... */ 858 static struct route sro_fwd; 859 struct route *ro_fwd = &sro_fwd; 860 861 #if 0 862 print_ip("IPFIREWALL_FORWARD: New dst ip: ", 863 dst->sin_addr, "\n"); 864 #endif 865 866 /* 867 * We need to figure out if we have been forwarded 868 * to a local socket. If so, then we should somehow 869 * "loop back" to ip_input, and get directed to the 870 * PCB as if we had received this packet. This is 871 * because it may be dificult to identify the packets 872 * you want to forward until they are being output 873 * and have selected an interface. (e.g. locally 874 * initiated packets) If we used the loopback inteface, 875 * we would not be able to control what happens 876 * as the packet runs through ip_input() as 877 * it is done through a ISR. 878 */ 879 LIST_FOREACH(ia, 880 INADDR_HASH(dst->sin_addr.s_addr), ia_hash) { 881 /* 882 * If the addr to forward to is one 883 * of ours, we pretend to 884 * be the destination for this packet. 885 */ 886 if (IA_SIN(ia)->sin_addr.s_addr == 887 dst->sin_addr.s_addr) 888 break; 889 } 890 if (ia) { /* tell ip_input "dont filter" */ 891 struct m_hdr tag; 892 893 tag.mh_type = MT_TAG; 894 tag.mh_flags = PACKET_TAG_IPFORWARD; 895 tag.mh_data = (caddr_t)args.next_hop; 896 tag.mh_next = m; 897 898 if (m->m_pkthdr.rcvif == NULL) 899 m->m_pkthdr.rcvif = ifunit("lo0"); 900 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 901 m->m_pkthdr.csum_flags |= 902 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 903 m0->m_pkthdr.csum_data = 0xffff; 904 } 905 m->m_pkthdr.csum_flags |= 906 CSUM_IP_CHECKED | CSUM_IP_VALID; 907 ip->ip_len = htons(ip->ip_len); 908 ip->ip_off = htons(ip->ip_off); 909 ip_input((struct mbuf *)&tag); 910 goto done; 911 } 912 /* Some of the logic for this was 913 * nicked from above. 914 * 915 * This rewrites the cached route in a local PCB. 916 * Is this what we want to do? 917 */ 918 bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst)); 919 920 ro_fwd->ro_rt = 0; 921 rtalloc_ign(ro_fwd, RTF_PRCLONING); 922 923 if (ro_fwd->ro_rt == 0) { 924 ipstat.ips_noroute++; 925 error = EHOSTUNREACH; 926 goto bad; 927 } 928 929 ia = ifatoia(ro_fwd->ro_rt->rt_ifa); 930 ifp = ro_fwd->ro_rt->rt_ifp; 931 ro_fwd->ro_rt->rt_use++; 932 if (ro_fwd->ro_rt->rt_flags & RTF_GATEWAY) 933 dst = (struct sockaddr_in *) 934 ro_fwd->ro_rt->rt_gateway; 935 if (ro_fwd->ro_rt->rt_flags & RTF_HOST) 936 isbroadcast = 937 (ro_fwd->ro_rt->rt_flags & RTF_BROADCAST); 938 else 939 isbroadcast = in_broadcast(dst->sin_addr, ifp); 940 if (ro->ro_rt) 941 RTFREE(ro->ro_rt); 942 ro->ro_rt = ro_fwd->ro_rt; 943 dst = (struct sockaddr_in *)&ro_fwd->ro_dst; 944 945 #endif /* ... block to be put into a function */ 946 /* 947 * If we added a default src ip earlier, 948 * which would have been gotten from the-then 949 * interface, do it again, from the new one. 950 */ 951 if (src_was_INADDR_ANY) 952 ip->ip_src = IA_SIN(ia)->sin_addr; 953 goto pass ; 954 } 955 956 /* 957 * if we get here, none of the above matches, and 958 * we have to drop the pkt 959 */ 960 m_freem(m); 961 error = EACCES; /* not sure this is the right error msg */ 962 goto done; 963 } 964 965 pass: 966 /* 127/8 must not appear on wire - RFC1122. */ 967 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 968 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 969 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 970 ipstat.ips_badaddr++; 971 error = EADDRNOTAVAIL; 972 goto bad; 973 } 974 } 975 976 m->m_pkthdr.csum_flags |= CSUM_IP; 977 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist; 978 if (sw_csum & CSUM_DELAY_DATA) { 979 in_delayed_cksum(m); 980 sw_csum &= ~CSUM_DELAY_DATA; 981 } 982 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 983 984 /* 985 * If small enough for interface, or the interface will take 986 * care of the fragmentation for us, can just send directly. 987 */ 988 if ((u_short)ip->ip_len <= ifp->if_mtu || 989 ifp->if_hwassist & CSUM_FRAGMENT) { 990 ip->ip_len = htons(ip->ip_len); 991 ip->ip_off = htons(ip->ip_off); 992 ip->ip_sum = 0; 993 if (sw_csum & CSUM_DELAY_IP) 994 ip->ip_sum = in_cksum(m, hlen); 995 996 /* Record statistics for this interface address. */ 997 if (!(flags & IP_FORWARDING) && ia) { 998 ia->ia_ifa.if_opackets++; 999 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1000 } 1001 1002 #ifdef IPSEC 1003 /* clean ipsec history once it goes out of the node */ 1004 ipsec_delaux(m); 1005 #endif 1006 1007 error = (*ifp->if_output)(ifp, m, 1008 (struct sockaddr *)dst, ro->ro_rt); 1009 goto done; 1010 } 1011 /* 1012 * Too large for interface; fragment if possible. 1013 * Must be able to put at least 8 bytes per fragment. 1014 */ 1015 if (ip->ip_off & IP_DF) { 1016 error = EMSGSIZE; 1017 /* 1018 * This case can happen if the user changed the MTU 1019 * of an interface after enabling IP on it. Because 1020 * most netifs don't keep track of routes pointing to 1021 * them, there is no way for one to update all its 1022 * routes when the MTU is changed. 1023 */ 1024 if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST)) 1025 && !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU) 1026 && (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) { 1027 ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu; 1028 } 1029 ipstat.ips_cantfrag++; 1030 goto bad; 1031 } 1032 len = (ifp->if_mtu - hlen) &~ 7; 1033 if (len < 8) { 1034 error = EMSGSIZE; 1035 goto bad; 1036 } 1037 1038 /* 1039 * if the interface will not calculate checksums on 1040 * fragmented packets, then do it here. 1041 */ 1042 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA && 1043 (ifp->if_hwassist & CSUM_IP_FRAGS) == 0) { 1044 in_delayed_cksum(m); 1045 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1046 } 1047 1048 if (len > PAGE_SIZE) { 1049 /* 1050 * Fragement large datagrams such that each segment 1051 * contains a multiple of PAGE_SIZE amount of data, 1052 * plus headers. This enables a receiver to perform 1053 * page-flipping zero-copy optimizations. 1054 */ 1055 1056 int newlen; 1057 struct mbuf *mtmp; 1058 1059 for (mtmp = m, off = 0; 1060 mtmp && ((off + mtmp->m_len) <= ifp->if_mtu); 1061 mtmp = mtmp->m_next) { 1062 off += mtmp->m_len; 1063 } 1064 /* 1065 * firstlen (off - hlen) must be aligned on an 1066 * 8-byte boundary 1067 */ 1068 if (off < hlen) 1069 goto smart_frag_failure; 1070 off = ((off - hlen) & ~7) + hlen; 1071 newlen = (~PAGE_MASK) & ifp->if_mtu; 1072 if ((newlen + sizeof (struct ip)) > ifp->if_mtu) { 1073 /* we failed, go back the default */ 1074 smart_frag_failure: 1075 newlen = len; 1076 off = hlen + len; 1077 } 1078 1079 /* printf("ipfrag: len = %d, hlen = %d, mhlen = %d, newlen = %d, off = %d\n", 1080 len, hlen, sizeof (struct ip), newlen, off);*/ 1081 1082 len = newlen; 1083 1084 } else { 1085 off = hlen + len; 1086 } 1087 1088 1089 1090 { 1091 int mhlen, firstlen = off - hlen; 1092 struct mbuf **mnext = &m->m_nextpkt; 1093 int nfrags = 1; 1094 1095 /* 1096 * Loop through length of segment after first fragment, 1097 * make new header and copy data of each part and link onto chain. 1098 */ 1099 m0 = m; 1100 mhlen = sizeof (struct ip); 1101 for (; off < (u_short)ip->ip_len; off += len) { 1102 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1103 if (m == 0) { 1104 error = ENOBUFS; 1105 ipstat.ips_odropped++; 1106 goto sendorfree; 1107 } 1108 m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG; 1109 m->m_data += max_linkhdr; 1110 mhip = mtod(m, struct ip *); 1111 *mhip = *ip; 1112 if (hlen > sizeof (struct ip)) { 1113 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1114 mhip->ip_v = IPVERSION; 1115 mhip->ip_hl = mhlen >> 2; 1116 } 1117 m->m_len = mhlen; 1118 mhip->ip_off = ((off - hlen) >> 3) + ip->ip_off; 1119 if (off + len >= (u_short)ip->ip_len) 1120 len = (u_short)ip->ip_len - off; 1121 else 1122 mhip->ip_off |= IP_MF; 1123 mhip->ip_len = htons((u_short)(len + mhlen)); 1124 m->m_next = m_copy(m0, off, len); 1125 if (m->m_next == 0) { 1126 (void) m_free(m); 1127 error = ENOBUFS; /* ??? */ 1128 ipstat.ips_odropped++; 1129 goto sendorfree; 1130 } 1131 m->m_pkthdr.len = mhlen + len; 1132 m->m_pkthdr.rcvif = (struct ifnet *)0; 1133 #ifdef MAC 1134 mac_create_fragment(m0, m); 1135 #endif 1136 m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags; 1137 mhip->ip_off = htons(mhip->ip_off); 1138 mhip->ip_sum = 0; 1139 if (sw_csum & CSUM_DELAY_IP) 1140 mhip->ip_sum = in_cksum(m, mhlen); 1141 *mnext = m; 1142 mnext = &m->m_nextpkt; 1143 nfrags++; 1144 } 1145 ipstat.ips_ofragments += nfrags; 1146 1147 /* set first/last markers for fragment chain */ 1148 m->m_flags |= M_LASTFRAG; 1149 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1150 m0->m_pkthdr.csum_data = nfrags; 1151 1152 /* 1153 * Update first fragment by trimming what's been copied out 1154 * and updating header, then send each fragment (in order). 1155 */ 1156 m = m0; 1157 m_adj(m, hlen + firstlen - (u_short)ip->ip_len); 1158 m->m_pkthdr.len = hlen + firstlen; 1159 ip->ip_len = htons((u_short)m->m_pkthdr.len); 1160 ip->ip_off |= IP_MF; 1161 ip->ip_off = htons(ip->ip_off); 1162 ip->ip_sum = 0; 1163 if (sw_csum & CSUM_DELAY_IP) 1164 ip->ip_sum = in_cksum(m, hlen); 1165 sendorfree: 1166 for (m = m0; m; m = m0) { 1167 m0 = m->m_nextpkt; 1168 m->m_nextpkt = 0; 1169 #ifdef IPSEC 1170 /* clean ipsec history once it goes out of the node */ 1171 ipsec_delaux(m); 1172 #endif 1173 if (error == 0) { 1174 /* Record statistics for this interface address. */ 1175 if (ia != NULL) { 1176 ia->ia_ifa.if_opackets++; 1177 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1178 } 1179 1180 error = (*ifp->if_output)(ifp, m, 1181 (struct sockaddr *)dst, ro->ro_rt); 1182 } else 1183 m_freem(m); 1184 } 1185 1186 if (error == 0) 1187 ipstat.ips_fragmented++; 1188 } 1189 done: 1190 #ifdef IPSEC 1191 if (ro == &iproute && ro->ro_rt) { 1192 RTFREE(ro->ro_rt); 1193 ro->ro_rt = NULL; 1194 } 1195 if (sp != NULL) { 1196 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1197 printf("DP ip_output call free SP:%p\n", sp)); 1198 key_freesp(sp); 1199 } 1200 #endif /* IPSEC */ 1201 #ifdef FAST_IPSEC 1202 if (ro == &iproute && ro->ro_rt) { 1203 RTFREE(ro->ro_rt); 1204 ro->ro_rt = NULL; 1205 } 1206 if (sp != NULL) 1207 KEY_FREESP(&sp); 1208 #endif /* FAST_IPSEC */ 1209 return (error); 1210 bad: 1211 m_freem(m); 1212 goto done; 1213 } 1214 1215 void 1216 in_delayed_cksum(struct mbuf *m) 1217 { 1218 struct ip *ip; 1219 u_short csum, offset; 1220 1221 ip = mtod(m, struct ip *); 1222 offset = ip->ip_hl << 2 ; 1223 csum = in_cksum_skip(m, ip->ip_len, offset); 1224 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0) 1225 csum = 0xffff; 1226 offset += m->m_pkthdr.csum_data; /* checksum offset */ 1227 1228 if (offset + sizeof(u_short) > m->m_len) { 1229 printf("delayed m_pullup, m->len: %d off: %d p: %d\n", 1230 m->m_len, offset, ip->ip_p); 1231 /* 1232 * XXX 1233 * this shouldn't happen, but if it does, the 1234 * correct behavior may be to insert the checksum 1235 * in the existing chain instead of rearranging it. 1236 */ 1237 m = m_pullup(m, offset + sizeof(u_short)); 1238 } 1239 *(u_short *)(m->m_data + offset) = csum; 1240 } 1241 1242 /* 1243 * Insert IP options into preformed packet. 1244 * Adjust IP destination as required for IP source routing, 1245 * as indicated by a non-zero in_addr at the start of the options. 1246 * 1247 * XXX This routine assumes that the packet has no options in place. 1248 */ 1249 static struct mbuf * 1250 ip_insertoptions(m, opt, phlen) 1251 register struct mbuf *m; 1252 struct mbuf *opt; 1253 int *phlen; 1254 { 1255 register struct ipoption *p = mtod(opt, struct ipoption *); 1256 struct mbuf *n; 1257 register struct ip *ip = mtod(m, struct ip *); 1258 unsigned optlen; 1259 1260 optlen = opt->m_len - sizeof(p->ipopt_dst); 1261 if (optlen + (u_short)ip->ip_len > IP_MAXPACKET) { 1262 *phlen = 0; 1263 return (m); /* XXX should fail */ 1264 } 1265 if (p->ipopt_dst.s_addr) 1266 ip->ip_dst = p->ipopt_dst; 1267 if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) { 1268 MGETHDR(n, M_DONTWAIT, MT_HEADER); 1269 if (n == 0) { 1270 *phlen = 0; 1271 return (m); 1272 } 1273 n->m_pkthdr.rcvif = (struct ifnet *)0; 1274 #ifdef MAC 1275 mac_create_mbuf_from_mbuf(m, n); 1276 #endif 1277 n->m_pkthdr.len = m->m_pkthdr.len + optlen; 1278 m->m_len -= sizeof(struct ip); 1279 m->m_data += sizeof(struct ip); 1280 n->m_next = m; 1281 m = n; 1282 m->m_len = optlen + sizeof(struct ip); 1283 m->m_data += max_linkhdr; 1284 (void)memcpy(mtod(m, void *), ip, sizeof(struct ip)); 1285 } else { 1286 m->m_data -= optlen; 1287 m->m_len += optlen; 1288 m->m_pkthdr.len += optlen; 1289 ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); 1290 } 1291 ip = mtod(m, struct ip *); 1292 bcopy(p->ipopt_list, ip + 1, optlen); 1293 *phlen = sizeof(struct ip) + optlen; 1294 ip->ip_v = IPVERSION; 1295 ip->ip_hl = *phlen >> 2; 1296 ip->ip_len += optlen; 1297 return (m); 1298 } 1299 1300 /* 1301 * Copy options from ip to jp, 1302 * omitting those not copied during fragmentation. 1303 */ 1304 int 1305 ip_optcopy(ip, jp) 1306 struct ip *ip, *jp; 1307 { 1308 register u_char *cp, *dp; 1309 int opt, optlen, cnt; 1310 1311 cp = (u_char *)(ip + 1); 1312 dp = (u_char *)(jp + 1); 1313 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 1314 for (; cnt > 0; cnt -= optlen, cp += optlen) { 1315 opt = cp[0]; 1316 if (opt == IPOPT_EOL) 1317 break; 1318 if (opt == IPOPT_NOP) { 1319 /* Preserve for IP mcast tunnel's LSRR alignment. */ 1320 *dp++ = IPOPT_NOP; 1321 optlen = 1; 1322 continue; 1323 } 1324 1325 KASSERT(cnt >= IPOPT_OLEN + sizeof(*cp), 1326 ("ip_optcopy: malformed ipv4 option")); 1327 optlen = cp[IPOPT_OLEN]; 1328 KASSERT(optlen >= IPOPT_OLEN + sizeof(*cp) && optlen <= cnt, 1329 ("ip_optcopy: malformed ipv4 option")); 1330 1331 /* bogus lengths should have been caught by ip_dooptions */ 1332 if (optlen > cnt) 1333 optlen = cnt; 1334 if (IPOPT_COPIED(opt)) { 1335 bcopy(cp, dp, optlen); 1336 dp += optlen; 1337 } 1338 } 1339 for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++) 1340 *dp++ = IPOPT_EOL; 1341 return (optlen); 1342 } 1343 1344 /* 1345 * IP socket option processing. 1346 */ 1347 int 1348 ip_ctloutput(so, sopt) 1349 struct socket *so; 1350 struct sockopt *sopt; 1351 { 1352 struct inpcb *inp = sotoinpcb(so); 1353 int error, optval; 1354 1355 error = optval = 0; 1356 if (sopt->sopt_level != IPPROTO_IP) { 1357 return (EINVAL); 1358 } 1359 1360 switch (sopt->sopt_dir) { 1361 case SOPT_SET: 1362 switch (sopt->sopt_name) { 1363 case IP_OPTIONS: 1364 #ifdef notyet 1365 case IP_RETOPTS: 1366 #endif 1367 { 1368 struct mbuf *m; 1369 if (sopt->sopt_valsize > MLEN) { 1370 error = EMSGSIZE; 1371 break; 1372 } 1373 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_HEADER); 1374 if (m == 0) { 1375 error = ENOBUFS; 1376 break; 1377 } 1378 m->m_len = sopt->sopt_valsize; 1379 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 1380 m->m_len); 1381 1382 return (ip_pcbopts(sopt->sopt_name, &inp->inp_options, 1383 m)); 1384 } 1385 1386 case IP_TOS: 1387 case IP_TTL: 1388 case IP_RECVOPTS: 1389 case IP_RECVRETOPTS: 1390 case IP_RECVDSTADDR: 1391 case IP_RECVIF: 1392 case IP_FAITH: 1393 error = sooptcopyin(sopt, &optval, sizeof optval, 1394 sizeof optval); 1395 if (error) 1396 break; 1397 1398 switch (sopt->sopt_name) { 1399 case IP_TOS: 1400 inp->inp_ip_tos = optval; 1401 break; 1402 1403 case IP_TTL: 1404 inp->inp_ip_ttl = optval; 1405 break; 1406 #define OPTSET(bit) \ 1407 if (optval) \ 1408 inp->inp_flags |= bit; \ 1409 else \ 1410 inp->inp_flags &= ~bit; 1411 1412 case IP_RECVOPTS: 1413 OPTSET(INP_RECVOPTS); 1414 break; 1415 1416 case IP_RECVRETOPTS: 1417 OPTSET(INP_RECVRETOPTS); 1418 break; 1419 1420 case IP_RECVDSTADDR: 1421 OPTSET(INP_RECVDSTADDR); 1422 break; 1423 1424 case IP_RECVIF: 1425 OPTSET(INP_RECVIF); 1426 break; 1427 1428 case IP_FAITH: 1429 OPTSET(INP_FAITH); 1430 break; 1431 } 1432 break; 1433 #undef OPTSET 1434 1435 case IP_MULTICAST_IF: 1436 case IP_MULTICAST_VIF: 1437 case IP_MULTICAST_TTL: 1438 case IP_MULTICAST_LOOP: 1439 case IP_ADD_MEMBERSHIP: 1440 case IP_DROP_MEMBERSHIP: 1441 error = ip_setmoptions(sopt, &inp->inp_moptions); 1442 break; 1443 1444 case IP_PORTRANGE: 1445 error = sooptcopyin(sopt, &optval, sizeof optval, 1446 sizeof optval); 1447 if (error) 1448 break; 1449 1450 switch (optval) { 1451 case IP_PORTRANGE_DEFAULT: 1452 inp->inp_flags &= ~(INP_LOWPORT); 1453 inp->inp_flags &= ~(INP_HIGHPORT); 1454 break; 1455 1456 case IP_PORTRANGE_HIGH: 1457 inp->inp_flags &= ~(INP_LOWPORT); 1458 inp->inp_flags |= INP_HIGHPORT; 1459 break; 1460 1461 case IP_PORTRANGE_LOW: 1462 inp->inp_flags &= ~(INP_HIGHPORT); 1463 inp->inp_flags |= INP_LOWPORT; 1464 break; 1465 1466 default: 1467 error = EINVAL; 1468 break; 1469 } 1470 break; 1471 1472 #if defined(IPSEC) || defined(FAST_IPSEC) 1473 case IP_IPSEC_POLICY: 1474 { 1475 caddr_t req; 1476 size_t len = 0; 1477 int priv; 1478 struct mbuf *m; 1479 int optname; 1480 1481 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1482 break; 1483 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1484 break; 1485 priv = (sopt->sopt_td != NULL && 1486 suser(sopt->sopt_td) != 0) ? 0 : 1; 1487 req = mtod(m, caddr_t); 1488 len = m->m_len; 1489 optname = sopt->sopt_name; 1490 error = ipsec4_set_policy(inp, optname, req, len, priv); 1491 m_freem(m); 1492 break; 1493 } 1494 #endif /*IPSEC*/ 1495 1496 default: 1497 error = ENOPROTOOPT; 1498 break; 1499 } 1500 break; 1501 1502 case SOPT_GET: 1503 switch (sopt->sopt_name) { 1504 case IP_OPTIONS: 1505 case IP_RETOPTS: 1506 if (inp->inp_options) 1507 error = sooptcopyout(sopt, 1508 mtod(inp->inp_options, 1509 char *), 1510 inp->inp_options->m_len); 1511 else 1512 sopt->sopt_valsize = 0; 1513 break; 1514 1515 case IP_TOS: 1516 case IP_TTL: 1517 case IP_RECVOPTS: 1518 case IP_RECVRETOPTS: 1519 case IP_RECVDSTADDR: 1520 case IP_RECVIF: 1521 case IP_PORTRANGE: 1522 case IP_FAITH: 1523 switch (sopt->sopt_name) { 1524 1525 case IP_TOS: 1526 optval = inp->inp_ip_tos; 1527 break; 1528 1529 case IP_TTL: 1530 optval = inp->inp_ip_ttl; 1531 break; 1532 1533 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1534 1535 case IP_RECVOPTS: 1536 optval = OPTBIT(INP_RECVOPTS); 1537 break; 1538 1539 case IP_RECVRETOPTS: 1540 optval = OPTBIT(INP_RECVRETOPTS); 1541 break; 1542 1543 case IP_RECVDSTADDR: 1544 optval = OPTBIT(INP_RECVDSTADDR); 1545 break; 1546 1547 case IP_RECVIF: 1548 optval = OPTBIT(INP_RECVIF); 1549 break; 1550 1551 case IP_PORTRANGE: 1552 if (inp->inp_flags & INP_HIGHPORT) 1553 optval = IP_PORTRANGE_HIGH; 1554 else if (inp->inp_flags & INP_LOWPORT) 1555 optval = IP_PORTRANGE_LOW; 1556 else 1557 optval = 0; 1558 break; 1559 1560 case IP_FAITH: 1561 optval = OPTBIT(INP_FAITH); 1562 break; 1563 } 1564 error = sooptcopyout(sopt, &optval, sizeof optval); 1565 break; 1566 1567 case IP_MULTICAST_IF: 1568 case IP_MULTICAST_VIF: 1569 case IP_MULTICAST_TTL: 1570 case IP_MULTICAST_LOOP: 1571 case IP_ADD_MEMBERSHIP: 1572 case IP_DROP_MEMBERSHIP: 1573 error = ip_getmoptions(sopt, inp->inp_moptions); 1574 break; 1575 1576 #if defined(IPSEC) || defined(FAST_IPSEC) 1577 case IP_IPSEC_POLICY: 1578 { 1579 struct mbuf *m = NULL; 1580 caddr_t req = NULL; 1581 size_t len = 0; 1582 1583 if (m != 0) { 1584 req = mtod(m, caddr_t); 1585 len = m->m_len; 1586 } 1587 error = ipsec4_get_policy(sotoinpcb(so), req, len, &m); 1588 if (error == 0) 1589 error = soopt_mcopyout(sopt, m); /* XXX */ 1590 if (error == 0) 1591 m_freem(m); 1592 break; 1593 } 1594 #endif /*IPSEC*/ 1595 1596 default: 1597 error = ENOPROTOOPT; 1598 break; 1599 } 1600 break; 1601 } 1602 return (error); 1603 } 1604 1605 /* 1606 * Set up IP options in pcb for insertion in output packets. 1607 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1608 * with destination address if source routed. 1609 */ 1610 static int 1611 ip_pcbopts(optname, pcbopt, m) 1612 int optname; 1613 struct mbuf **pcbopt; 1614 register struct mbuf *m; 1615 { 1616 register int cnt, optlen; 1617 register u_char *cp; 1618 u_char opt; 1619 1620 /* turn off any old options */ 1621 if (*pcbopt) 1622 (void)m_free(*pcbopt); 1623 *pcbopt = 0; 1624 if (m == (struct mbuf *)0 || m->m_len == 0) { 1625 /* 1626 * Only turning off any previous options. 1627 */ 1628 if (m) 1629 (void)m_free(m); 1630 return (0); 1631 } 1632 1633 if (m->m_len % sizeof(int32_t)) 1634 goto bad; 1635 /* 1636 * IP first-hop destination address will be stored before 1637 * actual options; move other options back 1638 * and clear it when none present. 1639 */ 1640 if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN]) 1641 goto bad; 1642 cnt = m->m_len; 1643 m->m_len += sizeof(struct in_addr); 1644 cp = mtod(m, u_char *) + sizeof(struct in_addr); 1645 ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt); 1646 bzero(mtod(m, caddr_t), sizeof(struct in_addr)); 1647 1648 for (; cnt > 0; cnt -= optlen, cp += optlen) { 1649 opt = cp[IPOPT_OPTVAL]; 1650 if (opt == IPOPT_EOL) 1651 break; 1652 if (opt == IPOPT_NOP) 1653 optlen = 1; 1654 else { 1655 if (cnt < IPOPT_OLEN + sizeof(*cp)) 1656 goto bad; 1657 optlen = cp[IPOPT_OLEN]; 1658 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) 1659 goto bad; 1660 } 1661 switch (opt) { 1662 1663 default: 1664 break; 1665 1666 case IPOPT_LSRR: 1667 case IPOPT_SSRR: 1668 /* 1669 * user process specifies route as: 1670 * ->A->B->C->D 1671 * D must be our final destination (but we can't 1672 * check that since we may not have connected yet). 1673 * A is first hop destination, which doesn't appear in 1674 * actual IP option, but is stored before the options. 1675 */ 1676 if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr)) 1677 goto bad; 1678 m->m_len -= sizeof(struct in_addr); 1679 cnt -= sizeof(struct in_addr); 1680 optlen -= sizeof(struct in_addr); 1681 cp[IPOPT_OLEN] = optlen; 1682 /* 1683 * Move first hop before start of options. 1684 */ 1685 bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t), 1686 sizeof(struct in_addr)); 1687 /* 1688 * Then copy rest of options back 1689 * to close up the deleted entry. 1690 */ 1691 ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] + 1692 sizeof(struct in_addr)), 1693 (caddr_t)&cp[IPOPT_OFFSET+1], 1694 (unsigned)cnt + sizeof(struct in_addr)); 1695 break; 1696 } 1697 } 1698 if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr)) 1699 goto bad; 1700 *pcbopt = m; 1701 return (0); 1702 1703 bad: 1704 (void)m_free(m); 1705 return (EINVAL); 1706 } 1707 1708 /* 1709 * XXX 1710 * The whole multicast option thing needs to be re-thought. 1711 * Several of these options are equally applicable to non-multicast 1712 * transmission, and one (IP_MULTICAST_TTL) totally duplicates a 1713 * standard option (IP_TTL). 1714 */ 1715 1716 /* 1717 * following RFC1724 section 3.3, 0.0.0.0/8 is interpreted as interface index. 1718 */ 1719 static struct ifnet * 1720 ip_multicast_if(a, ifindexp) 1721 struct in_addr *a; 1722 int *ifindexp; 1723 { 1724 int ifindex; 1725 struct ifnet *ifp; 1726 1727 if (ifindexp) 1728 *ifindexp = 0; 1729 if (ntohl(a->s_addr) >> 24 == 0) { 1730 ifindex = ntohl(a->s_addr) & 0xffffff; 1731 if (ifindex < 0 || if_index < ifindex) 1732 return NULL; 1733 ifp = ifnet_byindex(ifindex); 1734 if (ifindexp) 1735 *ifindexp = ifindex; 1736 } else { 1737 INADDR_TO_IFP(*a, ifp); 1738 } 1739 return ifp; 1740 } 1741 1742 /* 1743 * Set the IP multicast options in response to user setsockopt(). 1744 */ 1745 static int 1746 ip_setmoptions(sopt, imop) 1747 struct sockopt *sopt; 1748 struct ip_moptions **imop; 1749 { 1750 int error = 0; 1751 int i; 1752 struct in_addr addr; 1753 struct ip_mreq mreq; 1754 struct ifnet *ifp; 1755 struct ip_moptions *imo = *imop; 1756 struct route ro; 1757 struct sockaddr_in *dst; 1758 int ifindex; 1759 int s; 1760 1761 if (imo == NULL) { 1762 /* 1763 * No multicast option buffer attached to the pcb; 1764 * allocate one and initialize to default values. 1765 */ 1766 imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS, 1767 M_WAITOK); 1768 1769 if (imo == NULL) 1770 return (ENOBUFS); 1771 *imop = imo; 1772 imo->imo_multicast_ifp = NULL; 1773 imo->imo_multicast_addr.s_addr = INADDR_ANY; 1774 imo->imo_multicast_vif = -1; 1775 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; 1776 imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP; 1777 imo->imo_num_memberships = 0; 1778 } 1779 1780 switch (sopt->sopt_name) { 1781 /* store an index number for the vif you wanna use in the send */ 1782 case IP_MULTICAST_VIF: 1783 if (legal_vif_num == 0) { 1784 error = EOPNOTSUPP; 1785 break; 1786 } 1787 error = sooptcopyin(sopt, &i, sizeof i, sizeof i); 1788 if (error) 1789 break; 1790 if (!legal_vif_num(i) && (i != -1)) { 1791 error = EINVAL; 1792 break; 1793 } 1794 imo->imo_multicast_vif = i; 1795 break; 1796 1797 case IP_MULTICAST_IF: 1798 /* 1799 * Select the interface for outgoing multicast packets. 1800 */ 1801 error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr); 1802 if (error) 1803 break; 1804 /* 1805 * INADDR_ANY is used to remove a previous selection. 1806 * When no interface is selected, a default one is 1807 * chosen every time a multicast packet is sent. 1808 */ 1809 if (addr.s_addr == INADDR_ANY) { 1810 imo->imo_multicast_ifp = NULL; 1811 break; 1812 } 1813 /* 1814 * The selected interface is identified by its local 1815 * IP address. Find the interface and confirm that 1816 * it supports multicasting. 1817 */ 1818 s = splimp(); 1819 ifp = ip_multicast_if(&addr, &ifindex); 1820 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1821 splx(s); 1822 error = EADDRNOTAVAIL; 1823 break; 1824 } 1825 imo->imo_multicast_ifp = ifp; 1826 if (ifindex) 1827 imo->imo_multicast_addr = addr; 1828 else 1829 imo->imo_multicast_addr.s_addr = INADDR_ANY; 1830 splx(s); 1831 break; 1832 1833 case IP_MULTICAST_TTL: 1834 /* 1835 * Set the IP time-to-live for outgoing multicast packets. 1836 * The original multicast API required a char argument, 1837 * which is inconsistent with the rest of the socket API. 1838 * We allow either a char or an int. 1839 */ 1840 if (sopt->sopt_valsize == 1) { 1841 u_char ttl; 1842 error = sooptcopyin(sopt, &ttl, 1, 1); 1843 if (error) 1844 break; 1845 imo->imo_multicast_ttl = ttl; 1846 } else { 1847 u_int ttl; 1848 error = sooptcopyin(sopt, &ttl, sizeof ttl, 1849 sizeof ttl); 1850 if (error) 1851 break; 1852 if (ttl > 255) 1853 error = EINVAL; 1854 else 1855 imo->imo_multicast_ttl = ttl; 1856 } 1857 break; 1858 1859 case IP_MULTICAST_LOOP: 1860 /* 1861 * Set the loopback flag for outgoing multicast packets. 1862 * Must be zero or one. The original multicast API required a 1863 * char argument, which is inconsistent with the rest 1864 * of the socket API. We allow either a char or an int. 1865 */ 1866 if (sopt->sopt_valsize == 1) { 1867 u_char loop; 1868 error = sooptcopyin(sopt, &loop, 1, 1); 1869 if (error) 1870 break; 1871 imo->imo_multicast_loop = !!loop; 1872 } else { 1873 u_int loop; 1874 error = sooptcopyin(sopt, &loop, sizeof loop, 1875 sizeof loop); 1876 if (error) 1877 break; 1878 imo->imo_multicast_loop = !!loop; 1879 } 1880 break; 1881 1882 case IP_ADD_MEMBERSHIP: 1883 /* 1884 * Add a multicast group membership. 1885 * Group must be a valid IP multicast address. 1886 */ 1887 error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq); 1888 if (error) 1889 break; 1890 1891 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) { 1892 error = EINVAL; 1893 break; 1894 } 1895 s = splimp(); 1896 /* 1897 * If no interface address was provided, use the interface of 1898 * the route to the given multicast address. 1899 */ 1900 if (mreq.imr_interface.s_addr == INADDR_ANY) { 1901 bzero((caddr_t)&ro, sizeof(ro)); 1902 dst = (struct sockaddr_in *)&ro.ro_dst; 1903 dst->sin_len = sizeof(*dst); 1904 dst->sin_family = AF_INET; 1905 dst->sin_addr = mreq.imr_multiaddr; 1906 rtalloc(&ro); 1907 if (ro.ro_rt == NULL) { 1908 error = EADDRNOTAVAIL; 1909 splx(s); 1910 break; 1911 } 1912 ifp = ro.ro_rt->rt_ifp; 1913 rtfree(ro.ro_rt); 1914 } 1915 else { 1916 ifp = ip_multicast_if(&mreq.imr_interface, NULL); 1917 } 1918 1919 /* 1920 * See if we found an interface, and confirm that it 1921 * supports multicast. 1922 */ 1923 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1924 error = EADDRNOTAVAIL; 1925 splx(s); 1926 break; 1927 } 1928 /* 1929 * See if the membership already exists or if all the 1930 * membership slots are full. 1931 */ 1932 for (i = 0; i < imo->imo_num_memberships; ++i) { 1933 if (imo->imo_membership[i]->inm_ifp == ifp && 1934 imo->imo_membership[i]->inm_addr.s_addr 1935 == mreq.imr_multiaddr.s_addr) 1936 break; 1937 } 1938 if (i < imo->imo_num_memberships) { 1939 error = EADDRINUSE; 1940 splx(s); 1941 break; 1942 } 1943 if (i == IP_MAX_MEMBERSHIPS) { 1944 error = ETOOMANYREFS; 1945 splx(s); 1946 break; 1947 } 1948 /* 1949 * Everything looks good; add a new record to the multicast 1950 * address list for the given interface. 1951 */ 1952 if ((imo->imo_membership[i] = 1953 in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) { 1954 error = ENOBUFS; 1955 splx(s); 1956 break; 1957 } 1958 ++imo->imo_num_memberships; 1959 splx(s); 1960 break; 1961 1962 case IP_DROP_MEMBERSHIP: 1963 /* 1964 * Drop a multicast group membership. 1965 * Group must be a valid IP multicast address. 1966 */ 1967 error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq); 1968 if (error) 1969 break; 1970 1971 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) { 1972 error = EINVAL; 1973 break; 1974 } 1975 1976 s = splimp(); 1977 /* 1978 * If an interface address was specified, get a pointer 1979 * to its ifnet structure. 1980 */ 1981 if (mreq.imr_interface.s_addr == INADDR_ANY) 1982 ifp = NULL; 1983 else { 1984 ifp = ip_multicast_if(&mreq.imr_interface, NULL); 1985 if (ifp == NULL) { 1986 error = EADDRNOTAVAIL; 1987 splx(s); 1988 break; 1989 } 1990 } 1991 /* 1992 * Find the membership in the membership array. 1993 */ 1994 for (i = 0; i < imo->imo_num_memberships; ++i) { 1995 if ((ifp == NULL || 1996 imo->imo_membership[i]->inm_ifp == ifp) && 1997 imo->imo_membership[i]->inm_addr.s_addr == 1998 mreq.imr_multiaddr.s_addr) 1999 break; 2000 } 2001 if (i == imo->imo_num_memberships) { 2002 error = EADDRNOTAVAIL; 2003 splx(s); 2004 break; 2005 } 2006 /* 2007 * Give up the multicast address record to which the 2008 * membership points. 2009 */ 2010 in_delmulti(imo->imo_membership[i]); 2011 /* 2012 * Remove the gap in the membership array. 2013 */ 2014 for (++i; i < imo->imo_num_memberships; ++i) 2015 imo->imo_membership[i-1] = imo->imo_membership[i]; 2016 --imo->imo_num_memberships; 2017 splx(s); 2018 break; 2019 2020 default: 2021 error = EOPNOTSUPP; 2022 break; 2023 } 2024 2025 /* 2026 * If all options have default values, no need to keep the mbuf. 2027 */ 2028 if (imo->imo_multicast_ifp == NULL && 2029 imo->imo_multicast_vif == -1 && 2030 imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && 2031 imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && 2032 imo->imo_num_memberships == 0) { 2033 free(*imop, M_IPMOPTS); 2034 *imop = NULL; 2035 } 2036 2037 return (error); 2038 } 2039 2040 /* 2041 * Return the IP multicast options in response to user getsockopt(). 2042 */ 2043 static int 2044 ip_getmoptions(sopt, imo) 2045 struct sockopt *sopt; 2046 register struct ip_moptions *imo; 2047 { 2048 struct in_addr addr; 2049 struct in_ifaddr *ia; 2050 int error, optval; 2051 u_char coptval; 2052 2053 error = 0; 2054 switch (sopt->sopt_name) { 2055 case IP_MULTICAST_VIF: 2056 if (imo != NULL) 2057 optval = imo->imo_multicast_vif; 2058 else 2059 optval = -1; 2060 error = sooptcopyout(sopt, &optval, sizeof optval); 2061 break; 2062 2063 case IP_MULTICAST_IF: 2064 if (imo == NULL || imo->imo_multicast_ifp == NULL) 2065 addr.s_addr = INADDR_ANY; 2066 else if (imo->imo_multicast_addr.s_addr) { 2067 /* return the value user has set */ 2068 addr = imo->imo_multicast_addr; 2069 } else { 2070 IFP_TO_IA(imo->imo_multicast_ifp, ia); 2071 addr.s_addr = (ia == NULL) ? INADDR_ANY 2072 : IA_SIN(ia)->sin_addr.s_addr; 2073 } 2074 error = sooptcopyout(sopt, &addr, sizeof addr); 2075 break; 2076 2077 case IP_MULTICAST_TTL: 2078 if (imo == 0) 2079 optval = coptval = IP_DEFAULT_MULTICAST_TTL; 2080 else 2081 optval = coptval = imo->imo_multicast_ttl; 2082 if (sopt->sopt_valsize == 1) 2083 error = sooptcopyout(sopt, &coptval, 1); 2084 else 2085 error = sooptcopyout(sopt, &optval, sizeof optval); 2086 break; 2087 2088 case IP_MULTICAST_LOOP: 2089 if (imo == 0) 2090 optval = coptval = IP_DEFAULT_MULTICAST_LOOP; 2091 else 2092 optval = coptval = imo->imo_multicast_loop; 2093 if (sopt->sopt_valsize == 1) 2094 error = sooptcopyout(sopt, &coptval, 1); 2095 else 2096 error = sooptcopyout(sopt, &optval, sizeof optval); 2097 break; 2098 2099 default: 2100 error = ENOPROTOOPT; 2101 break; 2102 } 2103 return (error); 2104 } 2105 2106 /* 2107 * Discard the IP multicast options. 2108 */ 2109 void 2110 ip_freemoptions(imo) 2111 register struct ip_moptions *imo; 2112 { 2113 register int i; 2114 2115 if (imo != NULL) { 2116 for (i = 0; i < imo->imo_num_memberships; ++i) 2117 in_delmulti(imo->imo_membership[i]); 2118 free(imo, M_IPMOPTS); 2119 } 2120 } 2121 2122 /* 2123 * Routine called from ip_output() to loop back a copy of an IP multicast 2124 * packet to the input queue of a specified interface. Note that this 2125 * calls the output routine of the loopback "driver", but with an interface 2126 * pointer that might NOT be a loopback interface -- evil, but easier than 2127 * replicating that code here. 2128 */ 2129 static void 2130 ip_mloopback(ifp, m, dst, hlen) 2131 struct ifnet *ifp; 2132 register struct mbuf *m; 2133 register struct sockaddr_in *dst; 2134 int hlen; 2135 { 2136 register struct ip *ip; 2137 struct mbuf *copym; 2138 2139 copym = m_copy(m, 0, M_COPYALL); 2140 if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen)) 2141 copym = m_pullup(copym, hlen); 2142 if (copym != NULL) { 2143 /* 2144 * We don't bother to fragment if the IP length is greater 2145 * than the interface's MTU. Can this possibly matter? 2146 */ 2147 ip = mtod(copym, struct ip *); 2148 ip->ip_len = htons(ip->ip_len); 2149 ip->ip_off = htons(ip->ip_off); 2150 ip->ip_sum = 0; 2151 ip->ip_sum = in_cksum(copym, hlen); 2152 /* 2153 * NB: 2154 * It's not clear whether there are any lingering 2155 * reentrancy problems in other areas which might 2156 * be exposed by using ip_input directly (in 2157 * particular, everything which modifies the packet 2158 * in-place). Yet another option is using the 2159 * protosw directly to deliver the looped back 2160 * packet. For the moment, we'll err on the side 2161 * of safety by using if_simloop(). 2162 */ 2163 #if 1 /* XXX */ 2164 if (dst->sin_family != AF_INET) { 2165 printf("ip_mloopback: bad address family %d\n", 2166 dst->sin_family); 2167 dst->sin_family = AF_INET; 2168 } 2169 #endif 2170 2171 #ifdef notdef 2172 copym->m_pkthdr.rcvif = ifp; 2173 ip_input(copym); 2174 #else 2175 /* if the checksum hasn't been computed, mark it as valid */ 2176 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 2177 copym->m_pkthdr.csum_flags |= 2178 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 2179 copym->m_pkthdr.csum_data = 0xffff; 2180 } 2181 if_simloop(ifp, copym, dst->sin_family, 0); 2182 #endif 2183 } 2184 }
Cache object: a6bb0b179d23030421ac84f262b37d95
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