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: src/sys/netinet/ip_output.c,v 1.99.2.37 2003/04/15 06:44:45 silby Exp $ 35 * $DragonFly: src/sys/netinet/ip_output.c,v 1.2 2003/06/17 04:28:51 dillon Exp $ 36 */ 37 38 #define _IP_VHL 39 40 #include "opt_ipfw.h" 41 #include "opt_ipdn.h" 42 #include "opt_ipdivert.h" 43 #include "opt_ipfilter.h" 44 #include "opt_ipsec.h" 45 #include "opt_random_ip_id.h" 46 #include "opt_mbuf_stress_test.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/protosw.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/proc.h> 57 #include <sys/sysctl.h> 58 59 #include <net/if.h> 60 #include <net/route.h> 61 62 #include <netinet/in.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/ip.h> 65 #include <netinet/in_pcb.h> 66 #include <netinet/in_var.h> 67 #include <netinet/ip_var.h> 68 69 #include <machine/in_cksum.h> 70 71 static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options"); 72 73 #ifdef IPSEC 74 #include <netinet6/ipsec.h> 75 #include <netkey/key.h> 76 #ifdef IPSEC_DEBUG 77 #include <netkey/key_debug.h> 78 #else 79 #define KEYDEBUG(lev,arg) 80 #endif 81 #endif /*IPSEC*/ 82 83 #ifdef FAST_IPSEC 84 #include <netipsec/ipsec.h> 85 #include <netipsec/xform.h> 86 #include <netipsec/key.h> 87 #endif /*FAST_IPSEC*/ 88 89 #include <netinet/ip_fw.h> 90 #include <netinet/ip_dummynet.h> 91 92 #define print_ip(x, a, y) printf("%s %d.%d.%d.%d%s",\ 93 x, (ntohl(a.s_addr)>>24)&0xFF,\ 94 (ntohl(a.s_addr)>>16)&0xFF,\ 95 (ntohl(a.s_addr)>>8)&0xFF,\ 96 (ntohl(a.s_addr))&0xFF, y); 97 98 u_short ip_id; 99 100 #ifdef MBUF_STRESS_TEST 101 int mbuf_frag_size = 0; 102 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW, 103 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size"); 104 #endif 105 106 static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *); 107 static struct ifnet *ip_multicast_if(struct in_addr *, int *); 108 static void ip_mloopback 109 (struct ifnet *, struct mbuf *, struct sockaddr_in *, int); 110 static int ip_getmoptions 111 (struct sockopt *, struct ip_moptions *); 112 static int ip_pcbopts(int, struct mbuf **, struct mbuf *); 113 static int ip_setmoptions 114 (struct sockopt *, struct ip_moptions **); 115 116 int ip_optcopy(struct ip *, struct ip *); 117 extern int (*fr_checkp) (struct ip *, int, struct ifnet *, int, struct mbuf **); 118 119 120 extern struct protosw inetsw[]; 121 122 /* 123 * IP output. The packet in mbuf chain m contains a skeletal IP 124 * header (with len, off, ttl, proto, tos, src, dst). 125 * The mbuf chain containing the packet will be freed. 126 * The mbuf opt, if present, will not be freed. 127 */ 128 int 129 ip_output(m0, opt, ro, flags, imo, inp) 130 struct mbuf *m0; 131 struct mbuf *opt; 132 struct route *ro; 133 int flags; 134 struct ip_moptions *imo; 135 struct inpcb *inp; 136 { 137 struct ip *ip, *mhip; 138 struct ifnet *ifp = NULL; /* keep compiler happy */ 139 struct mbuf *m; 140 int hlen = sizeof (struct ip); 141 int len, off, error = 0; 142 struct sockaddr_in *dst = NULL; /* keep compiler happy */ 143 struct in_ifaddr *ia = NULL; 144 int isbroadcast, sw_csum; 145 struct in_addr pkt_dst; 146 #ifdef IPSEC 147 struct route iproute; 148 struct secpolicy *sp = NULL; 149 struct socket *so = inp ? inp->inp_socket : NULL; 150 #endif 151 #ifdef FAST_IPSEC 152 struct route iproute; 153 struct m_tag *mtag; 154 struct secpolicy *sp = NULL; 155 struct tdb_ident *tdbi; 156 int s; 157 #endif /* FAST_IPSEC */ 158 struct ip_fw_args args; 159 int src_was_INADDR_ANY = 0; /* as the name says... */ 160 161 args.eh = NULL; 162 args.rule = NULL; 163 args.next_hop = NULL; 164 args.divert_rule = 0; /* divert cookie */ 165 166 /* Grab info from MT_TAG mbufs prepended to the chain. */ 167 for (; m0 && m0->m_type == MT_TAG; m0 = m0->m_next) { 168 switch(m0->_m_tag_id) { 169 default: 170 printf("ip_output: unrecognised MT_TAG tag %d\n", 171 m0->_m_tag_id); 172 break; 173 174 case PACKET_TAG_DUMMYNET: 175 /* 176 * the packet was already tagged, so part of the 177 * processing was already done, and we need to go down. 178 * Get parameters from the header. 179 */ 180 args.rule = ((struct dn_pkt *)m0)->rule; 181 opt = NULL ; 182 ro = & ( ((struct dn_pkt *)m0)->ro ) ; 183 imo = NULL ; 184 dst = ((struct dn_pkt *)m0)->dn_dst ; 185 ifp = ((struct dn_pkt *)m0)->ifp ; 186 flags = ((struct dn_pkt *)m0)->flags ; 187 break; 188 189 case PACKET_TAG_DIVERT: 190 args.divert_rule = (int)m0->m_data & 0xffff; 191 break; 192 193 case PACKET_TAG_IPFORWARD: 194 args.next_hop = (struct sockaddr_in *)m0->m_data; 195 break; 196 } 197 } 198 m = m0; 199 200 KASSERT(!m || (m->m_flags & M_PKTHDR) != 0, ("ip_output: no HDR")); 201 #ifndef FAST_IPSEC 202 KASSERT(ro != NULL, ("ip_output: no route, proto %d", 203 mtod(m, struct ip *)->ip_p)); 204 #endif 205 206 if (args.rule != NULL) { /* dummynet already saw us */ 207 ip = mtod(m, struct ip *); 208 hlen = IP_VHL_HL(ip->ip_vhl) << 2 ; 209 if (ro->ro_rt) 210 ia = ifatoia(ro->ro_rt->rt_ifa); 211 goto sendit; 212 } 213 214 if (opt) { 215 len = 0; 216 m = ip_insertoptions(m, opt, &len); 217 if (len != 0) 218 hlen = len; 219 } 220 ip = mtod(m, struct ip *); 221 pkt_dst = args.next_hop ? args.next_hop->sin_addr : ip->ip_dst; 222 223 /* 224 * Fill in IP header. 225 */ 226 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 227 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2); 228 ip->ip_off &= IP_DF; 229 #ifdef RANDOM_IP_ID 230 ip->ip_id = ip_randomid(); 231 #else 232 ip->ip_id = htons(ip_id++); 233 #endif 234 ipstat.ips_localout++; 235 } else { 236 hlen = IP_VHL_HL(ip->ip_vhl) << 2; 237 } 238 239 #ifdef FAST_IPSEC 240 if (ro == NULL) { 241 ro = &iproute; 242 bzero(ro, sizeof (*ro)); 243 } 244 #endif /* FAST_IPSEC */ 245 dst = (struct sockaddr_in *)&ro->ro_dst; 246 /* 247 * If there is a cached route, 248 * check that it is to the same destination 249 * and is still up. If not, free it and try again. 250 * The address family should also be checked in case of sharing the 251 * cache with IPv6. 252 */ 253 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 254 dst->sin_family != AF_INET || 255 dst->sin_addr.s_addr != pkt_dst.s_addr)) { 256 RTFREE(ro->ro_rt); 257 ro->ro_rt = (struct rtentry *)0; 258 } 259 if (ro->ro_rt == 0) { 260 bzero(dst, sizeof(*dst)); 261 dst->sin_family = AF_INET; 262 dst->sin_len = sizeof(*dst); 263 dst->sin_addr = pkt_dst; 264 } 265 /* 266 * If routing to interface only, 267 * short circuit routing lookup. 268 */ 269 if (flags & IP_ROUTETOIF) { 270 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 && 271 (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) { 272 ipstat.ips_noroute++; 273 error = ENETUNREACH; 274 goto bad; 275 } 276 ifp = ia->ia_ifp; 277 ip->ip_ttl = 1; 278 isbroadcast = in_broadcast(dst->sin_addr, ifp); 279 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 280 imo != NULL && imo->imo_multicast_ifp != NULL) { 281 /* 282 * Bypass the normal routing lookup for multicast 283 * packets if the interface is specified. 284 */ 285 ifp = imo->imo_multicast_ifp; 286 IFP_TO_IA(ifp, ia); 287 isbroadcast = 0; /* fool gcc */ 288 } else { 289 /* 290 * If this is the case, we probably don't want to allocate 291 * a protocol-cloned route since we didn't get one from the 292 * ULP. This lets TCP do its thing, while not burdening 293 * forwarding or ICMP with the overhead of cloning a route. 294 * Of course, we still want to do any cloning requested by 295 * the link layer, as this is probably required in all cases 296 * for correct operation (as it is for ARP). 297 */ 298 if (ro->ro_rt == 0) 299 rtalloc_ign(ro, RTF_PRCLONING); 300 if (ro->ro_rt == 0) { 301 ipstat.ips_noroute++; 302 error = EHOSTUNREACH; 303 goto bad; 304 } 305 ia = ifatoia(ro->ro_rt->rt_ifa); 306 ifp = ro->ro_rt->rt_ifp; 307 ro->ro_rt->rt_use++; 308 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 309 dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 310 if (ro->ro_rt->rt_flags & RTF_HOST) 311 isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST); 312 else 313 isbroadcast = in_broadcast(dst->sin_addr, ifp); 314 } 315 if (IN_MULTICAST(ntohl(pkt_dst.s_addr))) { 316 struct in_multi *inm; 317 318 m->m_flags |= M_MCAST; 319 /* 320 * IP destination address is multicast. Make sure "dst" 321 * still points to the address in "ro". (It may have been 322 * changed to point to a gateway address, above.) 323 */ 324 dst = (struct sockaddr_in *)&ro->ro_dst; 325 /* 326 * See if the caller provided any multicast options 327 */ 328 if (imo != NULL) { 329 ip->ip_ttl = imo->imo_multicast_ttl; 330 if (imo->imo_multicast_vif != -1) 331 ip->ip_src.s_addr = 332 ip_mcast_src ? 333 ip_mcast_src(imo->imo_multicast_vif) : 334 INADDR_ANY; 335 } else 336 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 337 /* 338 * Confirm that the outgoing interface supports multicast. 339 */ 340 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 341 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 342 ipstat.ips_noroute++; 343 error = ENETUNREACH; 344 goto bad; 345 } 346 } 347 /* 348 * If source address not specified yet, use address 349 * of outgoing interface. 350 */ 351 if (ip->ip_src.s_addr == INADDR_ANY) { 352 /* Interface may have no addresses. */ 353 if (ia != NULL) 354 ip->ip_src = IA_SIN(ia)->sin_addr; 355 } 356 357 IN_LOOKUP_MULTI(pkt_dst, ifp, inm); 358 if (inm != NULL && 359 (imo == NULL || imo->imo_multicast_loop)) { 360 /* 361 * If we belong to the destination multicast group 362 * on the outgoing interface, and the caller did not 363 * forbid loopback, loop back a copy. 364 */ 365 ip_mloopback(ifp, m, dst, hlen); 366 } 367 else { 368 /* 369 * If we are acting as a multicast router, perform 370 * multicast forwarding as if the packet had just 371 * arrived on the interface to which we are about 372 * to send. The multicast forwarding function 373 * recursively calls this function, using the 374 * IP_FORWARDING flag to prevent infinite recursion. 375 * 376 * Multicasts that are looped back by ip_mloopback(), 377 * above, will be forwarded by the ip_input() routine, 378 * if necessary. 379 */ 380 if (ip_mrouter && (flags & IP_FORWARDING) == 0) { 381 /* 382 * If rsvp daemon is not running, do not 383 * set ip_moptions. This ensures that the packet 384 * is multicast and not just sent down one link 385 * as prescribed by rsvpd. 386 */ 387 if (!rsvp_on) 388 imo = NULL; 389 if (ip_mforward && 390 ip_mforward(ip, ifp, m, imo) != 0) { 391 m_freem(m); 392 goto done; 393 } 394 } 395 } 396 397 /* 398 * Multicasts with a time-to-live of zero may be looped- 399 * back, above, but must not be transmitted on a network. 400 * Also, multicasts addressed to the loopback interface 401 * are not sent -- the above call to ip_mloopback() will 402 * loop back a copy if this host actually belongs to the 403 * destination group on the loopback interface. 404 */ 405 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 406 m_freem(m); 407 goto done; 408 } 409 410 goto sendit; 411 } 412 #ifndef notdef 413 /* 414 * If the source address is not specified yet, use the address 415 * of the outoing interface. In case, keep note we did that, so 416 * if the the firewall changes the next-hop causing the output 417 * interface to change, we can fix that. 418 */ 419 if (ip->ip_src.s_addr == INADDR_ANY) { 420 /* Interface may have no addresses. */ 421 if (ia != NULL) { 422 ip->ip_src = IA_SIN(ia)->sin_addr; 423 src_was_INADDR_ANY = 1; 424 } 425 } 426 #endif /* notdef */ 427 /* 428 * Verify that we have any chance at all of being able to queue 429 * the packet or packet fragments 430 */ 431 if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >= 432 ifp->if_snd.ifq_maxlen) { 433 error = ENOBUFS; 434 ipstat.ips_odropped++; 435 goto bad; 436 } 437 438 /* 439 * Look for broadcast address and 440 * verify user is allowed to send 441 * such a packet. 442 */ 443 if (isbroadcast) { 444 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 445 error = EADDRNOTAVAIL; 446 goto bad; 447 } 448 if ((flags & IP_ALLOWBROADCAST) == 0) { 449 error = EACCES; 450 goto bad; 451 } 452 /* don't allow broadcast messages to be fragmented */ 453 if ((u_short)ip->ip_len > ifp->if_mtu) { 454 error = EMSGSIZE; 455 goto bad; 456 } 457 m->m_flags |= M_BCAST; 458 } else { 459 m->m_flags &= ~M_BCAST; 460 } 461 462 sendit: 463 #ifdef IPSEC 464 /* get SP for this packet */ 465 if (so == NULL) 466 sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, flags, &error); 467 else 468 sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 469 470 if (sp == NULL) { 471 ipsecstat.out_inval++; 472 goto bad; 473 } 474 475 error = 0; 476 477 /* check policy */ 478 switch (sp->policy) { 479 case IPSEC_POLICY_DISCARD: 480 /* 481 * This packet is just discarded. 482 */ 483 ipsecstat.out_polvio++; 484 goto bad; 485 486 case IPSEC_POLICY_BYPASS: 487 case IPSEC_POLICY_NONE: 488 /* no need to do IPsec. */ 489 goto skip_ipsec; 490 491 case IPSEC_POLICY_IPSEC: 492 if (sp->req == NULL) { 493 /* acquire a policy */ 494 error = key_spdacquire(sp); 495 goto bad; 496 } 497 break; 498 499 case IPSEC_POLICY_ENTRUST: 500 default: 501 printf("ip_output: Invalid policy found. %d\n", sp->policy); 502 } 503 { 504 struct ipsec_output_state state; 505 bzero(&state, sizeof(state)); 506 state.m = m; 507 if (flags & IP_ROUTETOIF) { 508 state.ro = &iproute; 509 bzero(&iproute, sizeof(iproute)); 510 } else 511 state.ro = ro; 512 state.dst = (struct sockaddr *)dst; 513 514 ip->ip_sum = 0; 515 516 /* 517 * XXX 518 * delayed checksums are not currently compatible with IPsec 519 */ 520 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 521 in_delayed_cksum(m); 522 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 523 } 524 525 ip->ip_len = htons(ip->ip_len); 526 ip->ip_off = htons(ip->ip_off); 527 528 error = ipsec4_output(&state, sp, flags); 529 530 m = state.m; 531 if (flags & IP_ROUTETOIF) { 532 /* 533 * if we have tunnel mode SA, we may need to ignore 534 * IP_ROUTETOIF. 535 */ 536 if (state.ro != &iproute || state.ro->ro_rt != NULL) { 537 flags &= ~IP_ROUTETOIF; 538 ro = state.ro; 539 } 540 } else 541 ro = state.ro; 542 dst = (struct sockaddr_in *)state.dst; 543 if (error) { 544 /* mbuf is already reclaimed in ipsec4_output. */ 545 m0 = NULL; 546 switch (error) { 547 case EHOSTUNREACH: 548 case ENETUNREACH: 549 case EMSGSIZE: 550 case ENOBUFS: 551 case ENOMEM: 552 break; 553 default: 554 printf("ip4_output (ipsec): error code %d\n", error); 555 /*fall through*/ 556 case ENOENT: 557 /* don't show these error codes to the user */ 558 error = 0; 559 break; 560 } 561 goto bad; 562 } 563 } 564 565 /* be sure to update variables that are affected by ipsec4_output() */ 566 ip = mtod(m, struct ip *); 567 #ifdef _IP_VHL 568 hlen = IP_VHL_HL(ip->ip_vhl) << 2; 569 #else 570 hlen = ip->ip_hl << 2; 571 #endif 572 if (ro->ro_rt == NULL) { 573 if ((flags & IP_ROUTETOIF) == 0) { 574 printf("ip_output: " 575 "can't update route after IPsec processing\n"); 576 error = EHOSTUNREACH; /*XXX*/ 577 goto bad; 578 } 579 } else { 580 ia = ifatoia(ro->ro_rt->rt_ifa); 581 ifp = ro->ro_rt->rt_ifp; 582 } 583 584 /* make it flipped, again. */ 585 ip->ip_len = ntohs(ip->ip_len); 586 ip->ip_off = ntohs(ip->ip_off); 587 skip_ipsec: 588 #endif /*IPSEC*/ 589 #ifdef FAST_IPSEC 590 /* 591 * Check the security policy (SP) for the packet and, if 592 * required, do IPsec-related processing. There are two 593 * cases here; the first time a packet is sent through 594 * it will be untagged and handled by ipsec4_checkpolicy. 595 * If the packet is resubmitted to ip_output (e.g. after 596 * AH, ESP, etc. processing), there will be a tag to bypass 597 * the lookup and related policy checking. 598 */ 599 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 600 s = splnet(); 601 if (mtag != NULL) { 602 tdbi = (struct tdb_ident *)(mtag + 1); 603 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND); 604 if (sp == NULL) 605 error = -EINVAL; /* force silent drop */ 606 m_tag_delete(m, mtag); 607 } else { 608 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, 609 &error, inp); 610 } 611 /* 612 * There are four return cases: 613 * sp != NULL apply IPsec policy 614 * sp == NULL, error == 0 no IPsec handling needed 615 * sp == NULL, error == -EINVAL discard packet w/o error 616 * sp == NULL, error != 0 discard packet, report error 617 */ 618 if (sp != NULL) { 619 /* Loop detection, check if ipsec processing already done */ 620 KASSERT(sp->req != NULL, ("ip_output: no ipsec request")); 621 for (mtag = m_tag_first(m); mtag != NULL; 622 mtag = m_tag_next(m, mtag)) { 623 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT) 624 continue; 625 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE && 626 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED) 627 continue; 628 /* 629 * Check if policy has an SA associated with it. 630 * This can happen when an SP has yet to acquire 631 * an SA; e.g. on first reference. If it occurs, 632 * then we let ipsec4_process_packet do its thing. 633 */ 634 if (sp->req->sav == NULL) 635 break; 636 tdbi = (struct tdb_ident *)(mtag + 1); 637 if (tdbi->spi == sp->req->sav->spi && 638 tdbi->proto == sp->req->sav->sah->saidx.proto && 639 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst, 640 sizeof (union sockaddr_union)) == 0) { 641 /* 642 * No IPsec processing is needed, free 643 * reference to SP. 644 * 645 * NB: null pointer to avoid free at 646 * done: below. 647 */ 648 KEY_FREESP(&sp), sp = NULL; 649 splx(s); 650 goto spd_done; 651 } 652 } 653 654 /* 655 * Do delayed checksums now because we send before 656 * this is done in the normal processing path. 657 */ 658 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 659 in_delayed_cksum(m); 660 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 661 } 662 663 ip->ip_len = htons(ip->ip_len); 664 ip->ip_off = htons(ip->ip_off); 665 666 /* NB: callee frees mbuf */ 667 error = ipsec4_process_packet(m, sp->req, flags, 0); 668 /* 669 * Preserve KAME behaviour: ENOENT can be returned 670 * when an SA acquire is in progress. Don't propagate 671 * this to user-level; it confuses applications. 672 * 673 * XXX this will go away when the SADB is redone. 674 */ 675 if (error == ENOENT) 676 error = 0; 677 splx(s); 678 goto done; 679 } else { 680 splx(s); 681 682 if (error != 0) { 683 /* 684 * Hack: -EINVAL is used to signal that a packet 685 * should be silently discarded. This is typically 686 * because we asked key management for an SA and 687 * it was delayed (e.g. kicked up to IKE). 688 */ 689 if (error == -EINVAL) 690 error = 0; 691 goto bad; 692 } else { 693 /* No IPsec processing for this packet. */ 694 } 695 #ifdef notyet 696 /* 697 * If deferred crypto processing is needed, check that 698 * the interface supports it. 699 */ 700 mtag = m_tag_find(m, PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED, NULL); 701 if (mtag != NULL && (ifp->if_capenable & IFCAP_IPSEC) == 0) { 702 /* notify IPsec to do its own crypto */ 703 ipsp_skipcrypto_unmark((struct tdb_ident *)(mtag + 1)); 704 error = EHOSTUNREACH; 705 goto bad; 706 } 707 #endif 708 } 709 spd_done: 710 #endif /* FAST_IPSEC */ 711 /* 712 * IpHack's section. 713 * - Xlate: translate packet's addr/port (NAT). 714 * - Firewall: deny/allow/etc. 715 * - Wrap: fake packet's addr/port <unimpl.> 716 * - Encapsulate: put it in another IP and send out. <unimp.> 717 */ 718 if (fr_checkp) { 719 struct mbuf *m1 = m; 720 721 if ((error = (*fr_checkp)(ip, hlen, ifp, 1, &m1)) || !m1) 722 goto done; 723 ip = mtod(m = m1, struct ip *); 724 } 725 726 /* 727 * Check with the firewall... 728 * but not if we are already being fwd'd from a firewall. 729 */ 730 if (fw_enable && IPFW_LOADED && !args.next_hop) { 731 struct sockaddr_in *old = dst; 732 733 args.m = m; 734 args.next_hop = dst; 735 args.oif = ifp; 736 off = ip_fw_chk_ptr(&args); 737 m = args.m; 738 dst = args.next_hop; 739 740 /* 741 * On return we must do the following: 742 * m == NULL -> drop the pkt (old interface, deprecated) 743 * (off & IP_FW_PORT_DENY_FLAG) -> drop the pkt (new interface) 744 * 1<=off<= 0xffff -> DIVERT 745 * (off & IP_FW_PORT_DYNT_FLAG) -> send to a DUMMYNET pipe 746 * (off & IP_FW_PORT_TEE_FLAG) -> TEE the packet 747 * dst != old -> IPFIREWALL_FORWARD 748 * off==0, dst==old -> accept 749 * If some of the above modules are not compiled in, then 750 * we should't have to check the corresponding condition 751 * (because the ipfw control socket should not accept 752 * unsupported rules), but better play safe and drop 753 * packets in case of doubt. 754 */ 755 if ( (off & IP_FW_PORT_DENY_FLAG) || m == NULL) { 756 if (m) 757 m_freem(m); 758 error = EACCES; 759 goto done; 760 } 761 ip = mtod(m, struct ip *); 762 if (off == 0 && dst == old) /* common case */ 763 goto pass; 764 if (DUMMYNET_LOADED && (off & IP_FW_PORT_DYNT_FLAG) != 0) { 765 /* 766 * pass the pkt to dummynet. Need to include 767 * pipe number, m, ifp, ro, dst because these are 768 * not recomputed in the next pass. 769 * All other parameters have been already used and 770 * so they are not needed anymore. 771 * XXX note: if the ifp or ro entry are deleted 772 * while a pkt is in dummynet, we are in trouble! 773 */ 774 args.ro = ro; 775 args.dst = dst; 776 args.flags = flags; 777 778 error = ip_dn_io_ptr(m, off & 0xffff, DN_TO_IP_OUT, 779 &args); 780 goto done; 781 } 782 #ifdef IPDIVERT 783 if (off != 0 && (off & IP_FW_PORT_DYNT_FLAG) == 0) { 784 struct mbuf *clone = NULL; 785 786 /* Clone packet if we're doing a 'tee' */ 787 if ((off & IP_FW_PORT_TEE_FLAG) != 0) 788 clone = m_dup(m, M_DONTWAIT); 789 790 /* 791 * XXX 792 * delayed checksums are not currently compatible 793 * with divert sockets. 794 */ 795 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 796 in_delayed_cksum(m); 797 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 798 } 799 800 /* Restore packet header fields to original values */ 801 ip->ip_len = htons(ip->ip_len); 802 ip->ip_off = htons(ip->ip_off); 803 804 /* Deliver packet to divert input routine */ 805 divert_packet(m, 0, off & 0xffff, args.divert_rule); 806 807 /* If 'tee', continue with original packet */ 808 if (clone != NULL) { 809 m = clone; 810 ip = mtod(m, struct ip *); 811 goto pass; 812 } 813 goto done; 814 } 815 #endif 816 817 /* IPFIREWALL_FORWARD */ 818 /* 819 * Check dst to make sure it is directly reachable on the 820 * interface we previously thought it was. 821 * If it isn't (which may be likely in some situations) we have 822 * to re-route it (ie, find a route for the next-hop and the 823 * associated interface) and set them here. This is nested 824 * forwarding which in most cases is undesirable, except where 825 * such control is nigh impossible. So we do it here. 826 * And I'm babbling. 827 */ 828 if (off == 0 && old != dst) { /* FORWARD, dst has changed */ 829 #if 0 830 /* 831 * XXX To improve readability, this block should be 832 * changed into a function call as below: 833 */ 834 error = ip_ipforward(&m, &dst, &ifp); 835 if (error) 836 goto bad; 837 if (m == NULL) /* ip_input consumed the mbuf */ 838 goto done; 839 #else 840 struct in_ifaddr *ia; 841 842 /* 843 * XXX sro_fwd below is static, and a pointer 844 * to it gets passed to routines downstream. 845 * This could have surprisingly bad results in 846 * practice, because its content is overwritten 847 * by subsequent packets. 848 */ 849 /* There must be a better way to do this next line... */ 850 static struct route sro_fwd; 851 struct route *ro_fwd = &sro_fwd; 852 853 #if 0 854 print_ip("IPFIREWALL_FORWARD: New dst ip: ", 855 dst->sin_addr, "\n"); 856 #endif 857 858 /* 859 * We need to figure out if we have been forwarded 860 * to a local socket. If so, then we should somehow 861 * "loop back" to ip_input, and get directed to the 862 * PCB as if we had received this packet. This is 863 * because it may be dificult to identify the packets 864 * you want to forward until they are being output 865 * and have selected an interface. (e.g. locally 866 * initiated packets) If we used the loopback inteface, 867 * we would not be able to control what happens 868 * as the packet runs through ip_input() as 869 * it is done through a ISR. 870 */ 871 LIST_FOREACH(ia, 872 INADDR_HASH(dst->sin_addr.s_addr), ia_hash) { 873 /* 874 * If the addr to forward to is one 875 * of ours, we pretend to 876 * be the destination for this packet. 877 */ 878 if (IA_SIN(ia)->sin_addr.s_addr == 879 dst->sin_addr.s_addr) 880 break; 881 } 882 if (ia) { /* tell ip_input "dont filter" */ 883 struct m_hdr tag; 884 885 tag.mh_type = MT_TAG; 886 tag.mh_flags = PACKET_TAG_IPFORWARD; 887 tag.mh_data = (caddr_t)args.next_hop; 888 tag.mh_next = m; 889 890 if (m->m_pkthdr.rcvif == NULL) 891 m->m_pkthdr.rcvif = ifunit("lo0"); 892 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 893 m->m_pkthdr.csum_flags |= 894 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 895 m0->m_pkthdr.csum_data = 0xffff; 896 } 897 m->m_pkthdr.csum_flags |= 898 CSUM_IP_CHECKED | CSUM_IP_VALID; 899 ip->ip_len = htons(ip->ip_len); 900 ip->ip_off = htons(ip->ip_off); 901 ip_input((struct mbuf *)&tag); 902 goto done; 903 } 904 /* Some of the logic for this was 905 * nicked from above. 906 * 907 * This rewrites the cached route in a local PCB. 908 * Is this what we want to do? 909 */ 910 bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst)); 911 912 ro_fwd->ro_rt = 0; 913 rtalloc_ign(ro_fwd, RTF_PRCLONING); 914 915 if (ro_fwd->ro_rt == 0) { 916 ipstat.ips_noroute++; 917 error = EHOSTUNREACH; 918 goto bad; 919 } 920 921 ia = ifatoia(ro_fwd->ro_rt->rt_ifa); 922 ifp = ro_fwd->ro_rt->rt_ifp; 923 ro_fwd->ro_rt->rt_use++; 924 if (ro_fwd->ro_rt->rt_flags & RTF_GATEWAY) 925 dst = (struct sockaddr_in *) 926 ro_fwd->ro_rt->rt_gateway; 927 if (ro_fwd->ro_rt->rt_flags & RTF_HOST) 928 isbroadcast = 929 (ro_fwd->ro_rt->rt_flags & RTF_BROADCAST); 930 else 931 isbroadcast = in_broadcast(dst->sin_addr, ifp); 932 if (ro->ro_rt) 933 RTFREE(ro->ro_rt); 934 ro->ro_rt = ro_fwd->ro_rt; 935 dst = (struct sockaddr_in *)&ro_fwd->ro_dst; 936 937 #endif /* ... block to be put into a function */ 938 /* 939 * If we added a default src ip earlier, 940 * which would have been gotten from the-then 941 * interface, do it again, from the new one. 942 */ 943 if (src_was_INADDR_ANY) 944 ip->ip_src = IA_SIN(ia)->sin_addr; 945 goto pass ; 946 } 947 948 /* 949 * if we get here, none of the above matches, and 950 * we have to drop the pkt 951 */ 952 m_freem(m); 953 error = EACCES; /* not sure this is the right error msg */ 954 goto done; 955 } 956 957 pass: 958 /* 127/8 must not appear on wire - RFC1122. */ 959 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 960 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 961 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 962 ipstat.ips_badaddr++; 963 error = EADDRNOTAVAIL; 964 goto bad; 965 } 966 } 967 968 m->m_pkthdr.csum_flags |= CSUM_IP; 969 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist; 970 if (sw_csum & CSUM_DELAY_DATA) { 971 in_delayed_cksum(m); 972 sw_csum &= ~CSUM_DELAY_DATA; 973 } 974 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 975 976 /* 977 * If small enough for interface, or the interface will take 978 * care of the fragmentation for us, can just send directly. 979 */ 980 if ((u_short)ip->ip_len <= ifp->if_mtu || 981 ifp->if_hwassist & CSUM_FRAGMENT) { 982 ip->ip_len = htons(ip->ip_len); 983 ip->ip_off = htons(ip->ip_off); 984 ip->ip_sum = 0; 985 if (sw_csum & CSUM_DELAY_IP) { 986 if (ip->ip_vhl == IP_VHL_BORING) { 987 ip->ip_sum = in_cksum_hdr(ip); 988 } else { 989 ip->ip_sum = in_cksum(m, hlen); 990 } 991 } 992 993 /* Record statistics for this interface address. */ 994 if (!(flags & IP_FORWARDING) && ia) { 995 ia->ia_ifa.if_opackets++; 996 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 997 } 998 999 #ifdef IPSEC 1000 /* clean ipsec history once it goes out of the node */ 1001 ipsec_delaux(m); 1002 #endif 1003 1004 #ifdef MBUF_STRESS_TEST 1005 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) { 1006 struct mbuf *m1, *m2; 1007 int length, tmp; 1008 1009 tmp = length = m->m_pkthdr.len; 1010 1011 while ((length -= mbuf_frag_size) >= 1) { 1012 m1 = m_split(m, length, M_DONTWAIT); 1013 if (m1 == NULL) 1014 break; 1015 m1->m_flags &= ~M_PKTHDR; 1016 m2 = m; 1017 while (m2->m_next != NULL) 1018 m2 = m2->m_next; 1019 m2->m_next = m1; 1020 } 1021 m->m_pkthdr.len = tmp; 1022 } 1023 #endif 1024 error = (*ifp->if_output)(ifp, m, 1025 (struct sockaddr *)dst, ro->ro_rt); 1026 goto done; 1027 } 1028 /* 1029 * Too large for interface; fragment if possible. 1030 * Must be able to put at least 8 bytes per fragment. 1031 */ 1032 if (ip->ip_off & IP_DF) { 1033 error = EMSGSIZE; 1034 /* 1035 * This case can happen if the user changed the MTU 1036 * of an interface after enabling IP on it. Because 1037 * most netifs don't keep track of routes pointing to 1038 * them, there is no way for one to update all its 1039 * routes when the MTU is changed. 1040 */ 1041 if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST)) 1042 && !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU) 1043 && (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) { 1044 ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu; 1045 } 1046 ipstat.ips_cantfrag++; 1047 goto bad; 1048 } 1049 len = (ifp->if_mtu - hlen) &~ 7; 1050 if (len < 8) { 1051 error = EMSGSIZE; 1052 goto bad; 1053 } 1054 1055 /* 1056 * if the interface will not calculate checksums on 1057 * fragmented packets, then do it here. 1058 */ 1059 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA && 1060 (ifp->if_hwassist & CSUM_IP_FRAGS) == 0) { 1061 in_delayed_cksum(m); 1062 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1063 } 1064 1065 { 1066 int mhlen, firstlen = len; 1067 struct mbuf **mnext = &m->m_nextpkt; 1068 int nfrags = 1; 1069 1070 /* 1071 * Loop through length of segment after first fragment, 1072 * make new header and copy data of each part and link onto chain. 1073 */ 1074 m0 = m; 1075 mhlen = sizeof (struct ip); 1076 for (off = hlen + len; off < (u_short)ip->ip_len; off += len) { 1077 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1078 if (m == 0) { 1079 error = ENOBUFS; 1080 ipstat.ips_odropped++; 1081 goto sendorfree; 1082 } 1083 m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG; 1084 m->m_data += max_linkhdr; 1085 mhip = mtod(m, struct ip *); 1086 *mhip = *ip; 1087 if (hlen > sizeof (struct ip)) { 1088 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1089 mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2); 1090 } 1091 m->m_len = mhlen; 1092 mhip->ip_off = ((off - hlen) >> 3) + ip->ip_off; 1093 if (off + len >= (u_short)ip->ip_len) 1094 len = (u_short)ip->ip_len - off; 1095 else 1096 mhip->ip_off |= IP_MF; 1097 mhip->ip_len = htons((u_short)(len + mhlen)); 1098 m->m_next = m_copy(m0, off, len); 1099 if (m->m_next == 0) { 1100 (void) m_free(m); 1101 error = ENOBUFS; /* ??? */ 1102 ipstat.ips_odropped++; 1103 goto sendorfree; 1104 } 1105 m->m_pkthdr.len = mhlen + len; 1106 m->m_pkthdr.rcvif = (struct ifnet *)0; 1107 m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags; 1108 mhip->ip_off = htons(mhip->ip_off); 1109 mhip->ip_sum = 0; 1110 if (sw_csum & CSUM_DELAY_IP) { 1111 if (mhip->ip_vhl == IP_VHL_BORING) { 1112 mhip->ip_sum = in_cksum_hdr(mhip); 1113 } else { 1114 mhip->ip_sum = in_cksum(m, mhlen); 1115 } 1116 } 1117 *mnext = m; 1118 mnext = &m->m_nextpkt; 1119 nfrags++; 1120 } 1121 ipstat.ips_ofragments += nfrags; 1122 1123 /* set first/last markers for fragment chain */ 1124 m->m_flags |= M_LASTFRAG; 1125 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1126 m0->m_pkthdr.csum_data = nfrags; 1127 1128 /* 1129 * Update first fragment by trimming what's been copied out 1130 * and updating header, then send each fragment (in order). 1131 */ 1132 m = m0; 1133 m_adj(m, hlen + firstlen - (u_short)ip->ip_len); 1134 m->m_pkthdr.len = hlen + firstlen; 1135 ip->ip_len = htons((u_short)m->m_pkthdr.len); 1136 ip->ip_off |= IP_MF; 1137 ip->ip_off = htons(ip->ip_off); 1138 ip->ip_sum = 0; 1139 if (sw_csum & CSUM_DELAY_IP) { 1140 if (ip->ip_vhl == IP_VHL_BORING) { 1141 ip->ip_sum = in_cksum_hdr(ip); 1142 } else { 1143 ip->ip_sum = in_cksum(m, hlen); 1144 } 1145 } 1146 sendorfree: 1147 for (m = m0; m; m = m0) { 1148 m0 = m->m_nextpkt; 1149 m->m_nextpkt = 0; 1150 #ifdef IPSEC 1151 /* clean ipsec history once it goes out of the node */ 1152 ipsec_delaux(m); 1153 #endif 1154 if (error == 0) { 1155 /* Record statistics for this interface address. */ 1156 if (ia != NULL) { 1157 ia->ia_ifa.if_opackets++; 1158 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1159 } 1160 1161 error = (*ifp->if_output)(ifp, m, 1162 (struct sockaddr *)dst, ro->ro_rt); 1163 } else 1164 m_freem(m); 1165 } 1166 1167 if (error == 0) 1168 ipstat.ips_fragmented++; 1169 } 1170 done: 1171 #ifdef IPSEC 1172 if (ro == &iproute && ro->ro_rt) { 1173 RTFREE(ro->ro_rt); 1174 ro->ro_rt = NULL; 1175 } 1176 if (sp != NULL) { 1177 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1178 printf("DP ip_output call free SP:%p\n", sp)); 1179 key_freesp(sp); 1180 } 1181 #endif /* IPSEC */ 1182 #ifdef FAST_IPSEC 1183 if (ro == &iproute && ro->ro_rt) { 1184 RTFREE(ro->ro_rt); 1185 ro->ro_rt = NULL; 1186 } 1187 if (sp != NULL) 1188 KEY_FREESP(&sp); 1189 #endif /* FAST_IPSEC */ 1190 return (error); 1191 bad: 1192 m_freem(m); 1193 goto done; 1194 } 1195 1196 void 1197 in_delayed_cksum(struct mbuf *m) 1198 { 1199 struct ip *ip; 1200 u_short csum, offset; 1201 1202 ip = mtod(m, struct ip *); 1203 offset = IP_VHL_HL(ip->ip_vhl) << 2 ; 1204 csum = in_cksum_skip(m, ip->ip_len, offset); 1205 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0) 1206 csum = 0xffff; 1207 offset += m->m_pkthdr.csum_data; /* checksum offset */ 1208 1209 if (offset + sizeof(u_short) > m->m_len) { 1210 printf("delayed m_pullup, m->len: %d off: %d p: %d\n", 1211 m->m_len, offset, ip->ip_p); 1212 /* 1213 * XXX 1214 * this shouldn't happen, but if it does, the 1215 * correct behavior may be to insert the checksum 1216 * in the existing chain instead of rearranging it. 1217 */ 1218 m = m_pullup(m, offset + sizeof(u_short)); 1219 } 1220 *(u_short *)(m->m_data + offset) = csum; 1221 } 1222 1223 /* 1224 * Insert IP options into preformed packet. 1225 * Adjust IP destination as required for IP source routing, 1226 * as indicated by a non-zero in_addr at the start of the options. 1227 * 1228 * XXX This routine assumes that the packet has no options in place. 1229 */ 1230 static struct mbuf * 1231 ip_insertoptions(m, opt, phlen) 1232 register struct mbuf *m; 1233 struct mbuf *opt; 1234 int *phlen; 1235 { 1236 register struct ipoption *p = mtod(opt, struct ipoption *); 1237 struct mbuf *n; 1238 register struct ip *ip = mtod(m, struct ip *); 1239 unsigned optlen; 1240 1241 optlen = opt->m_len - sizeof(p->ipopt_dst); 1242 if (optlen + (u_short)ip->ip_len > IP_MAXPACKET) { 1243 *phlen = 0; 1244 return (m); /* XXX should fail */ 1245 } 1246 if (p->ipopt_dst.s_addr) 1247 ip->ip_dst = p->ipopt_dst; 1248 if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) { 1249 MGETHDR(n, M_DONTWAIT, MT_HEADER); 1250 if (n == 0) { 1251 *phlen = 0; 1252 return (m); 1253 } 1254 n->m_pkthdr.rcvif = (struct ifnet *)0; 1255 n->m_pkthdr.len = m->m_pkthdr.len + optlen; 1256 m->m_len -= sizeof(struct ip); 1257 m->m_data += sizeof(struct ip); 1258 n->m_next = m; 1259 m = n; 1260 m->m_len = optlen + sizeof(struct ip); 1261 m->m_data += max_linkhdr; 1262 (void)memcpy(mtod(m, void *), ip, sizeof(struct ip)); 1263 } else { 1264 m->m_data -= optlen; 1265 m->m_len += optlen; 1266 m->m_pkthdr.len += optlen; 1267 ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); 1268 } 1269 ip = mtod(m, struct ip *); 1270 bcopy(p->ipopt_list, ip + 1, optlen); 1271 *phlen = sizeof(struct ip) + optlen; 1272 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2); 1273 ip->ip_len += optlen; 1274 return (m); 1275 } 1276 1277 /* 1278 * Copy options from ip to jp, 1279 * omitting those not copied during fragmentation. 1280 */ 1281 int 1282 ip_optcopy(ip, jp) 1283 struct ip *ip, *jp; 1284 { 1285 register u_char *cp, *dp; 1286 int opt, optlen, cnt; 1287 1288 cp = (u_char *)(ip + 1); 1289 dp = (u_char *)(jp + 1); 1290 cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); 1291 for (; cnt > 0; cnt -= optlen, cp += optlen) { 1292 opt = cp[0]; 1293 if (opt == IPOPT_EOL) 1294 break; 1295 if (opt == IPOPT_NOP) { 1296 /* Preserve for IP mcast tunnel's LSRR alignment. */ 1297 *dp++ = IPOPT_NOP; 1298 optlen = 1; 1299 continue; 1300 } 1301 1302 KASSERT(cnt >= IPOPT_OLEN + sizeof(*cp), 1303 ("ip_optcopy: malformed ipv4 option")); 1304 optlen = cp[IPOPT_OLEN]; 1305 KASSERT(optlen >= IPOPT_OLEN + sizeof(*cp) && optlen <= cnt, 1306 ("ip_optcopy: malformed ipv4 option")); 1307 1308 /* bogus lengths should have been caught by ip_dooptions */ 1309 if (optlen > cnt) 1310 optlen = cnt; 1311 if (IPOPT_COPIED(opt)) { 1312 bcopy(cp, dp, optlen); 1313 dp += optlen; 1314 } 1315 } 1316 for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++) 1317 *dp++ = IPOPT_EOL; 1318 return (optlen); 1319 } 1320 1321 /* 1322 * IP socket option processing. 1323 */ 1324 int 1325 ip_ctloutput(so, sopt) 1326 struct socket *so; 1327 struct sockopt *sopt; 1328 { 1329 struct inpcb *inp = sotoinpcb(so); 1330 int error, optval; 1331 1332 error = optval = 0; 1333 if (sopt->sopt_level != IPPROTO_IP) { 1334 return (EINVAL); 1335 } 1336 1337 switch (sopt->sopt_dir) { 1338 case SOPT_SET: 1339 switch (sopt->sopt_name) { 1340 case IP_OPTIONS: 1341 #ifdef notyet 1342 case IP_RETOPTS: 1343 #endif 1344 { 1345 struct mbuf *m; 1346 if (sopt->sopt_valsize > MLEN) { 1347 error = EMSGSIZE; 1348 break; 1349 } 1350 MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER); 1351 if (m == 0) { 1352 error = ENOBUFS; 1353 break; 1354 } 1355 m->m_len = sopt->sopt_valsize; 1356 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 1357 m->m_len); 1358 1359 return (ip_pcbopts(sopt->sopt_name, &inp->inp_options, 1360 m)); 1361 } 1362 1363 case IP_TOS: 1364 case IP_TTL: 1365 case IP_RECVOPTS: 1366 case IP_RECVRETOPTS: 1367 case IP_RECVDSTADDR: 1368 case IP_RECVIF: 1369 case IP_FAITH: 1370 error = sooptcopyin(sopt, &optval, sizeof optval, 1371 sizeof optval); 1372 if (error) 1373 break; 1374 1375 switch (sopt->sopt_name) { 1376 case IP_TOS: 1377 inp->inp_ip_tos = optval; 1378 break; 1379 1380 case IP_TTL: 1381 inp->inp_ip_ttl = optval; 1382 break; 1383 #define OPTSET(bit) \ 1384 if (optval) \ 1385 inp->inp_flags |= bit; \ 1386 else \ 1387 inp->inp_flags &= ~bit; 1388 1389 case IP_RECVOPTS: 1390 OPTSET(INP_RECVOPTS); 1391 break; 1392 1393 case IP_RECVRETOPTS: 1394 OPTSET(INP_RECVRETOPTS); 1395 break; 1396 1397 case IP_RECVDSTADDR: 1398 OPTSET(INP_RECVDSTADDR); 1399 break; 1400 1401 case IP_RECVIF: 1402 OPTSET(INP_RECVIF); 1403 break; 1404 1405 case IP_FAITH: 1406 OPTSET(INP_FAITH); 1407 break; 1408 } 1409 break; 1410 #undef OPTSET 1411 1412 case IP_MULTICAST_IF: 1413 case IP_MULTICAST_VIF: 1414 case IP_MULTICAST_TTL: 1415 case IP_MULTICAST_LOOP: 1416 case IP_ADD_MEMBERSHIP: 1417 case IP_DROP_MEMBERSHIP: 1418 error = ip_setmoptions(sopt, &inp->inp_moptions); 1419 break; 1420 1421 case IP_PORTRANGE: 1422 error = sooptcopyin(sopt, &optval, sizeof optval, 1423 sizeof optval); 1424 if (error) 1425 break; 1426 1427 switch (optval) { 1428 case IP_PORTRANGE_DEFAULT: 1429 inp->inp_flags &= ~(INP_LOWPORT); 1430 inp->inp_flags &= ~(INP_HIGHPORT); 1431 break; 1432 1433 case IP_PORTRANGE_HIGH: 1434 inp->inp_flags &= ~(INP_LOWPORT); 1435 inp->inp_flags |= INP_HIGHPORT; 1436 break; 1437 1438 case IP_PORTRANGE_LOW: 1439 inp->inp_flags &= ~(INP_HIGHPORT); 1440 inp->inp_flags |= INP_LOWPORT; 1441 break; 1442 1443 default: 1444 error = EINVAL; 1445 break; 1446 } 1447 break; 1448 1449 #if defined(IPSEC) || defined(FAST_IPSEC) 1450 case IP_IPSEC_POLICY: 1451 { 1452 caddr_t req; 1453 size_t len = 0; 1454 int priv; 1455 struct mbuf *m; 1456 int optname; 1457 1458 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1459 break; 1460 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1461 break; 1462 priv = (sopt->sopt_p != NULL && 1463 suser(sopt->sopt_p) != 0) ? 0 : 1; 1464 req = mtod(m, caddr_t); 1465 len = m->m_len; 1466 optname = sopt->sopt_name; 1467 error = ipsec4_set_policy(inp, optname, req, len, priv); 1468 m_freem(m); 1469 break; 1470 } 1471 #endif /*IPSEC*/ 1472 1473 default: 1474 error = ENOPROTOOPT; 1475 break; 1476 } 1477 break; 1478 1479 case SOPT_GET: 1480 switch (sopt->sopt_name) { 1481 case IP_OPTIONS: 1482 case IP_RETOPTS: 1483 if (inp->inp_options) 1484 error = sooptcopyout(sopt, 1485 mtod(inp->inp_options, 1486 char *), 1487 inp->inp_options->m_len); 1488 else 1489 sopt->sopt_valsize = 0; 1490 break; 1491 1492 case IP_TOS: 1493 case IP_TTL: 1494 case IP_RECVOPTS: 1495 case IP_RECVRETOPTS: 1496 case IP_RECVDSTADDR: 1497 case IP_RECVIF: 1498 case IP_PORTRANGE: 1499 case IP_FAITH: 1500 switch (sopt->sopt_name) { 1501 1502 case IP_TOS: 1503 optval = inp->inp_ip_tos; 1504 break; 1505 1506 case IP_TTL: 1507 optval = inp->inp_ip_ttl; 1508 break; 1509 1510 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1511 1512 case IP_RECVOPTS: 1513 optval = OPTBIT(INP_RECVOPTS); 1514 break; 1515 1516 case IP_RECVRETOPTS: 1517 optval = OPTBIT(INP_RECVRETOPTS); 1518 break; 1519 1520 case IP_RECVDSTADDR: 1521 optval = OPTBIT(INP_RECVDSTADDR); 1522 break; 1523 1524 case IP_RECVIF: 1525 optval = OPTBIT(INP_RECVIF); 1526 break; 1527 1528 case IP_PORTRANGE: 1529 if (inp->inp_flags & INP_HIGHPORT) 1530 optval = IP_PORTRANGE_HIGH; 1531 else if (inp->inp_flags & INP_LOWPORT) 1532 optval = IP_PORTRANGE_LOW; 1533 else 1534 optval = 0; 1535 break; 1536 1537 case IP_FAITH: 1538 optval = OPTBIT(INP_FAITH); 1539 break; 1540 } 1541 error = sooptcopyout(sopt, &optval, sizeof optval); 1542 break; 1543 1544 case IP_MULTICAST_IF: 1545 case IP_MULTICAST_VIF: 1546 case IP_MULTICAST_TTL: 1547 case IP_MULTICAST_LOOP: 1548 case IP_ADD_MEMBERSHIP: 1549 case IP_DROP_MEMBERSHIP: 1550 error = ip_getmoptions(sopt, inp->inp_moptions); 1551 break; 1552 1553 #if defined(IPSEC) || defined(FAST_IPSEC) 1554 case IP_IPSEC_POLICY: 1555 { 1556 struct mbuf *m = NULL; 1557 caddr_t req = NULL; 1558 size_t len = 0; 1559 1560 if (m != 0) { 1561 req = mtod(m, caddr_t); 1562 len = m->m_len; 1563 } 1564 error = ipsec4_get_policy(sotoinpcb(so), req, len, &m); 1565 if (error == 0) 1566 error = soopt_mcopyout(sopt, m); /* XXX */ 1567 if (error == 0) 1568 m_freem(m); 1569 break; 1570 } 1571 #endif /*IPSEC*/ 1572 1573 default: 1574 error = ENOPROTOOPT; 1575 break; 1576 } 1577 break; 1578 } 1579 return (error); 1580 } 1581 1582 /* 1583 * Set up IP options in pcb for insertion in output packets. 1584 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1585 * with destination address if source routed. 1586 */ 1587 static int 1588 ip_pcbopts(optname, pcbopt, m) 1589 int optname; 1590 struct mbuf **pcbopt; 1591 register struct mbuf *m; 1592 { 1593 register int cnt, optlen; 1594 register u_char *cp; 1595 u_char opt; 1596 1597 /* turn off any old options */ 1598 if (*pcbopt) 1599 (void)m_free(*pcbopt); 1600 *pcbopt = 0; 1601 if (m == (struct mbuf *)0 || m->m_len == 0) { 1602 /* 1603 * Only turning off any previous options. 1604 */ 1605 if (m) 1606 (void)m_free(m); 1607 return (0); 1608 } 1609 1610 if (m->m_len % sizeof(int32_t)) 1611 goto bad; 1612 /* 1613 * IP first-hop destination address will be stored before 1614 * actual options; move other options back 1615 * and clear it when none present. 1616 */ 1617 if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN]) 1618 goto bad; 1619 cnt = m->m_len; 1620 m->m_len += sizeof(struct in_addr); 1621 cp = mtod(m, u_char *) + sizeof(struct in_addr); 1622 ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt); 1623 bzero(mtod(m, caddr_t), sizeof(struct in_addr)); 1624 1625 for (; cnt > 0; cnt -= optlen, cp += optlen) { 1626 opt = cp[IPOPT_OPTVAL]; 1627 if (opt == IPOPT_EOL) 1628 break; 1629 if (opt == IPOPT_NOP) 1630 optlen = 1; 1631 else { 1632 if (cnt < IPOPT_OLEN + sizeof(*cp)) 1633 goto bad; 1634 optlen = cp[IPOPT_OLEN]; 1635 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) 1636 goto bad; 1637 } 1638 switch (opt) { 1639 1640 default: 1641 break; 1642 1643 case IPOPT_LSRR: 1644 case IPOPT_SSRR: 1645 /* 1646 * user process specifies route as: 1647 * ->A->B->C->D 1648 * D must be our final destination (but we can't 1649 * check that since we may not have connected yet). 1650 * A is first hop destination, which doesn't appear in 1651 * actual IP option, but is stored before the options. 1652 */ 1653 if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr)) 1654 goto bad; 1655 m->m_len -= sizeof(struct in_addr); 1656 cnt -= sizeof(struct in_addr); 1657 optlen -= sizeof(struct in_addr); 1658 cp[IPOPT_OLEN] = optlen; 1659 /* 1660 * Move first hop before start of options. 1661 */ 1662 bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t), 1663 sizeof(struct in_addr)); 1664 /* 1665 * Then copy rest of options back 1666 * to close up the deleted entry. 1667 */ 1668 ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] + 1669 sizeof(struct in_addr)), 1670 (caddr_t)&cp[IPOPT_OFFSET+1], 1671 (unsigned)cnt + sizeof(struct in_addr)); 1672 break; 1673 } 1674 } 1675 if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr)) 1676 goto bad; 1677 *pcbopt = m; 1678 return (0); 1679 1680 bad: 1681 (void)m_free(m); 1682 return (EINVAL); 1683 } 1684 1685 /* 1686 * XXX 1687 * The whole multicast option thing needs to be re-thought. 1688 * Several of these options are equally applicable to non-multicast 1689 * transmission, and one (IP_MULTICAST_TTL) totally duplicates a 1690 * standard option (IP_TTL). 1691 */ 1692 1693 /* 1694 * following RFC1724 section 3.3, 0.0.0.0/8 is interpreted as interface index. 1695 */ 1696 static struct ifnet * 1697 ip_multicast_if(a, ifindexp) 1698 struct in_addr *a; 1699 int *ifindexp; 1700 { 1701 int ifindex; 1702 struct ifnet *ifp; 1703 1704 if (ifindexp) 1705 *ifindexp = 0; 1706 if (ntohl(a->s_addr) >> 24 == 0) { 1707 ifindex = ntohl(a->s_addr) & 0xffffff; 1708 if (ifindex < 0 || if_index < ifindex) 1709 return NULL; 1710 ifp = ifindex2ifnet[ifindex]; 1711 if (ifindexp) 1712 *ifindexp = ifindex; 1713 } else { 1714 INADDR_TO_IFP(*a, ifp); 1715 } 1716 return ifp; 1717 } 1718 1719 /* 1720 * Set the IP multicast options in response to user setsockopt(). 1721 */ 1722 static int 1723 ip_setmoptions(sopt, imop) 1724 struct sockopt *sopt; 1725 struct ip_moptions **imop; 1726 { 1727 int error = 0; 1728 int i; 1729 struct in_addr addr; 1730 struct ip_mreq mreq; 1731 struct ifnet *ifp; 1732 struct ip_moptions *imo = *imop; 1733 struct route ro; 1734 struct sockaddr_in *dst; 1735 int ifindex; 1736 int s; 1737 1738 if (imo == NULL) { 1739 /* 1740 * No multicast option buffer attached to the pcb; 1741 * allocate one and initialize to default values. 1742 */ 1743 imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS, 1744 M_WAITOK); 1745 1746 if (imo == NULL) 1747 return (ENOBUFS); 1748 *imop = imo; 1749 imo->imo_multicast_ifp = NULL; 1750 imo->imo_multicast_addr.s_addr = INADDR_ANY; 1751 imo->imo_multicast_vif = -1; 1752 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; 1753 imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP; 1754 imo->imo_num_memberships = 0; 1755 } 1756 1757 switch (sopt->sopt_name) { 1758 /* store an index number for the vif you wanna use in the send */ 1759 case IP_MULTICAST_VIF: 1760 if (legal_vif_num == 0) { 1761 error = EOPNOTSUPP; 1762 break; 1763 } 1764 error = sooptcopyin(sopt, &i, sizeof i, sizeof i); 1765 if (error) 1766 break; 1767 if (!legal_vif_num(i) && (i != -1)) { 1768 error = EINVAL; 1769 break; 1770 } 1771 imo->imo_multicast_vif = i; 1772 break; 1773 1774 case IP_MULTICAST_IF: 1775 /* 1776 * Select the interface for outgoing multicast packets. 1777 */ 1778 error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr); 1779 if (error) 1780 break; 1781 /* 1782 * INADDR_ANY is used to remove a previous selection. 1783 * When no interface is selected, a default one is 1784 * chosen every time a multicast packet is sent. 1785 */ 1786 if (addr.s_addr == INADDR_ANY) { 1787 imo->imo_multicast_ifp = NULL; 1788 break; 1789 } 1790 /* 1791 * The selected interface is identified by its local 1792 * IP address. Find the interface and confirm that 1793 * it supports multicasting. 1794 */ 1795 s = splimp(); 1796 ifp = ip_multicast_if(&addr, &ifindex); 1797 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1798 splx(s); 1799 error = EADDRNOTAVAIL; 1800 break; 1801 } 1802 imo->imo_multicast_ifp = ifp; 1803 if (ifindex) 1804 imo->imo_multicast_addr = addr; 1805 else 1806 imo->imo_multicast_addr.s_addr = INADDR_ANY; 1807 splx(s); 1808 break; 1809 1810 case IP_MULTICAST_TTL: 1811 /* 1812 * Set the IP time-to-live for outgoing multicast packets. 1813 * The original multicast API required a char argument, 1814 * which is inconsistent with the rest of the socket API. 1815 * We allow either a char or an int. 1816 */ 1817 if (sopt->sopt_valsize == 1) { 1818 u_char ttl; 1819 error = sooptcopyin(sopt, &ttl, 1, 1); 1820 if (error) 1821 break; 1822 imo->imo_multicast_ttl = ttl; 1823 } else { 1824 u_int ttl; 1825 error = sooptcopyin(sopt, &ttl, sizeof ttl, 1826 sizeof ttl); 1827 if (error) 1828 break; 1829 if (ttl > 255) 1830 error = EINVAL; 1831 else 1832 imo->imo_multicast_ttl = ttl; 1833 } 1834 break; 1835 1836 case IP_MULTICAST_LOOP: 1837 /* 1838 * Set the loopback flag for outgoing multicast packets. 1839 * Must be zero or one. The original multicast API required a 1840 * char argument, which is inconsistent with the rest 1841 * of the socket API. We allow either a char or an int. 1842 */ 1843 if (sopt->sopt_valsize == 1) { 1844 u_char loop; 1845 error = sooptcopyin(sopt, &loop, 1, 1); 1846 if (error) 1847 break; 1848 imo->imo_multicast_loop = !!loop; 1849 } else { 1850 u_int loop; 1851 error = sooptcopyin(sopt, &loop, sizeof loop, 1852 sizeof loop); 1853 if (error) 1854 break; 1855 imo->imo_multicast_loop = !!loop; 1856 } 1857 break; 1858 1859 case IP_ADD_MEMBERSHIP: 1860 /* 1861 * Add a multicast group membership. 1862 * Group must be a valid IP multicast address. 1863 */ 1864 error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq); 1865 if (error) 1866 break; 1867 1868 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) { 1869 error = EINVAL; 1870 break; 1871 } 1872 s = splimp(); 1873 /* 1874 * If no interface address was provided, use the interface of 1875 * the route to the given multicast address. 1876 */ 1877 if (mreq.imr_interface.s_addr == INADDR_ANY) { 1878 bzero((caddr_t)&ro, sizeof(ro)); 1879 dst = (struct sockaddr_in *)&ro.ro_dst; 1880 dst->sin_len = sizeof(*dst); 1881 dst->sin_family = AF_INET; 1882 dst->sin_addr = mreq.imr_multiaddr; 1883 rtalloc(&ro); 1884 if (ro.ro_rt == NULL) { 1885 error = EADDRNOTAVAIL; 1886 splx(s); 1887 break; 1888 } 1889 ifp = ro.ro_rt->rt_ifp; 1890 rtfree(ro.ro_rt); 1891 } 1892 else { 1893 ifp = ip_multicast_if(&mreq.imr_interface, NULL); 1894 } 1895 1896 /* 1897 * See if we found an interface, and confirm that it 1898 * supports multicast. 1899 */ 1900 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1901 error = EADDRNOTAVAIL; 1902 splx(s); 1903 break; 1904 } 1905 /* 1906 * See if the membership already exists or if all the 1907 * membership slots are full. 1908 */ 1909 for (i = 0; i < imo->imo_num_memberships; ++i) { 1910 if (imo->imo_membership[i]->inm_ifp == ifp && 1911 imo->imo_membership[i]->inm_addr.s_addr 1912 == mreq.imr_multiaddr.s_addr) 1913 break; 1914 } 1915 if (i < imo->imo_num_memberships) { 1916 error = EADDRINUSE; 1917 splx(s); 1918 break; 1919 } 1920 if (i == IP_MAX_MEMBERSHIPS) { 1921 error = ETOOMANYREFS; 1922 splx(s); 1923 break; 1924 } 1925 /* 1926 * Everything looks good; add a new record to the multicast 1927 * address list for the given interface. 1928 */ 1929 if ((imo->imo_membership[i] = 1930 in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) { 1931 error = ENOBUFS; 1932 splx(s); 1933 break; 1934 } 1935 ++imo->imo_num_memberships; 1936 splx(s); 1937 break; 1938 1939 case IP_DROP_MEMBERSHIP: 1940 /* 1941 * Drop a multicast group membership. 1942 * Group must be a valid IP multicast address. 1943 */ 1944 error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq); 1945 if (error) 1946 break; 1947 1948 if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) { 1949 error = EINVAL; 1950 break; 1951 } 1952 1953 s = splimp(); 1954 /* 1955 * If an interface address was specified, get a pointer 1956 * to its ifnet structure. 1957 */ 1958 if (mreq.imr_interface.s_addr == INADDR_ANY) 1959 ifp = NULL; 1960 else { 1961 ifp = ip_multicast_if(&mreq.imr_interface, NULL); 1962 if (ifp == NULL) { 1963 error = EADDRNOTAVAIL; 1964 splx(s); 1965 break; 1966 } 1967 } 1968 /* 1969 * Find the membership in the membership array. 1970 */ 1971 for (i = 0; i < imo->imo_num_memberships; ++i) { 1972 if ((ifp == NULL || 1973 imo->imo_membership[i]->inm_ifp == ifp) && 1974 imo->imo_membership[i]->inm_addr.s_addr == 1975 mreq.imr_multiaddr.s_addr) 1976 break; 1977 } 1978 if (i == imo->imo_num_memberships) { 1979 error = EADDRNOTAVAIL; 1980 splx(s); 1981 break; 1982 } 1983 /* 1984 * Give up the multicast address record to which the 1985 * membership points. 1986 */ 1987 in_delmulti(imo->imo_membership[i]); 1988 /* 1989 * Remove the gap in the membership array. 1990 */ 1991 for (++i; i < imo->imo_num_memberships; ++i) 1992 imo->imo_membership[i-1] = imo->imo_membership[i]; 1993 --imo->imo_num_memberships; 1994 splx(s); 1995 break; 1996 1997 default: 1998 error = EOPNOTSUPP; 1999 break; 2000 } 2001 2002 /* 2003 * If all options have default values, no need to keep the mbuf. 2004 */ 2005 if (imo->imo_multicast_ifp == NULL && 2006 imo->imo_multicast_vif == -1 && 2007 imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && 2008 imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && 2009 imo->imo_num_memberships == 0) { 2010 free(*imop, M_IPMOPTS); 2011 *imop = NULL; 2012 } 2013 2014 return (error); 2015 } 2016 2017 /* 2018 * Return the IP multicast options in response to user getsockopt(). 2019 */ 2020 static int 2021 ip_getmoptions(sopt, imo) 2022 struct sockopt *sopt; 2023 register struct ip_moptions *imo; 2024 { 2025 struct in_addr addr; 2026 struct in_ifaddr *ia; 2027 int error, optval; 2028 u_char coptval; 2029 2030 error = 0; 2031 switch (sopt->sopt_name) { 2032 case IP_MULTICAST_VIF: 2033 if (imo != NULL) 2034 optval = imo->imo_multicast_vif; 2035 else 2036 optval = -1; 2037 error = sooptcopyout(sopt, &optval, sizeof optval); 2038 break; 2039 2040 case IP_MULTICAST_IF: 2041 if (imo == NULL || imo->imo_multicast_ifp == NULL) 2042 addr.s_addr = INADDR_ANY; 2043 else if (imo->imo_multicast_addr.s_addr) { 2044 /* return the value user has set */ 2045 addr = imo->imo_multicast_addr; 2046 } else { 2047 IFP_TO_IA(imo->imo_multicast_ifp, ia); 2048 addr.s_addr = (ia == NULL) ? INADDR_ANY 2049 : IA_SIN(ia)->sin_addr.s_addr; 2050 } 2051 error = sooptcopyout(sopt, &addr, sizeof addr); 2052 break; 2053 2054 case IP_MULTICAST_TTL: 2055 if (imo == 0) 2056 optval = coptval = IP_DEFAULT_MULTICAST_TTL; 2057 else 2058 optval = coptval = imo->imo_multicast_ttl; 2059 if (sopt->sopt_valsize == 1) 2060 error = sooptcopyout(sopt, &coptval, 1); 2061 else 2062 error = sooptcopyout(sopt, &optval, sizeof optval); 2063 break; 2064 2065 case IP_MULTICAST_LOOP: 2066 if (imo == 0) 2067 optval = coptval = IP_DEFAULT_MULTICAST_LOOP; 2068 else 2069 optval = coptval = imo->imo_multicast_loop; 2070 if (sopt->sopt_valsize == 1) 2071 error = sooptcopyout(sopt, &coptval, 1); 2072 else 2073 error = sooptcopyout(sopt, &optval, sizeof optval); 2074 break; 2075 2076 default: 2077 error = ENOPROTOOPT; 2078 break; 2079 } 2080 return (error); 2081 } 2082 2083 /* 2084 * Discard the IP multicast options. 2085 */ 2086 void 2087 ip_freemoptions(imo) 2088 register struct ip_moptions *imo; 2089 { 2090 register int i; 2091 2092 if (imo != NULL) { 2093 for (i = 0; i < imo->imo_num_memberships; ++i) 2094 in_delmulti(imo->imo_membership[i]); 2095 free(imo, M_IPMOPTS); 2096 } 2097 } 2098 2099 /* 2100 * Routine called from ip_output() to loop back a copy of an IP multicast 2101 * packet to the input queue of a specified interface. Note that this 2102 * calls the output routine of the loopback "driver", but with an interface 2103 * pointer that might NOT be a loopback interface -- evil, but easier than 2104 * replicating that code here. 2105 */ 2106 static void 2107 ip_mloopback(ifp, m, dst, hlen) 2108 struct ifnet *ifp; 2109 register struct mbuf *m; 2110 register struct sockaddr_in *dst; 2111 int hlen; 2112 { 2113 register struct ip *ip; 2114 struct mbuf *copym; 2115 2116 copym = m_copy(m, 0, M_COPYALL); 2117 if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen)) 2118 copym = m_pullup(copym, hlen); 2119 if (copym != NULL) { 2120 /* 2121 * We don't bother to fragment if the IP length is greater 2122 * than the interface's MTU. Can this possibly matter? 2123 */ 2124 ip = mtod(copym, struct ip *); 2125 ip->ip_len = htons(ip->ip_len); 2126 ip->ip_off = htons(ip->ip_off); 2127 ip->ip_sum = 0; 2128 if (ip->ip_vhl == IP_VHL_BORING) { 2129 ip->ip_sum = in_cksum_hdr(ip); 2130 } else { 2131 ip->ip_sum = in_cksum(copym, hlen); 2132 } 2133 /* 2134 * NB: 2135 * It's not clear whether there are any lingering 2136 * reentrancy problems in other areas which might 2137 * be exposed by using ip_input directly (in 2138 * particular, everything which modifies the packet 2139 * in-place). Yet another option is using the 2140 * protosw directly to deliver the looped back 2141 * packet. For the moment, we'll err on the side 2142 * of safety by using if_simloop(). 2143 */ 2144 #if 1 /* XXX */ 2145 if (dst->sin_family != AF_INET) { 2146 printf("ip_mloopback: bad address family %d\n", 2147 dst->sin_family); 2148 dst->sin_family = AF_INET; 2149 } 2150 #endif 2151 2152 #ifdef notdef 2153 copym->m_pkthdr.rcvif = ifp; 2154 ip_input(copym); 2155 #else 2156 /* if the checksum hasn't been computed, mark it as valid */ 2157 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 2158 copym->m_pkthdr.csum_flags |= 2159 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 2160 copym->m_pkthdr.csum_data = 0xffff; 2161 } 2162 if_simloop(ifp, copym, dst->sin_family, 0); 2163 #endif 2164 } 2165 } 2166