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