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