ip_output.c revision 1.288
1 /* $NetBSD: ip_output.c,v 1.288 2017/12/22 11:22:37 ozaki-r Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 1998 The NetBSD Foundation, Inc. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to The NetBSD Foundation 37 * by Public Access Networks Corporation ("Panix"). It was developed under 38 * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 50 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 51 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 52 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 53 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 54 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 55 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 56 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 57 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 58 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 59 * POSSIBILITY OF SUCH DAMAGE. 60 */ 61 62 /* 63 * Copyright (c) 1982, 1986, 1988, 1990, 1993 64 * The Regents of the University of California. All rights reserved. 65 * 66 * Redistribution and use in source and binary forms, with or without 67 * modification, are permitted provided that the following conditions 68 * are met: 69 * 1. Redistributions of source code must retain the above copyright 70 * notice, this list of conditions and the following disclaimer. 71 * 2. Redistributions in binary form must reproduce the above copyright 72 * notice, this list of conditions and the following disclaimer in the 73 * documentation and/or other materials provided with the distribution. 74 * 3. Neither the name of the University nor the names of its contributors 75 * may be used to endorse or promote products derived from this software 76 * without specific prior written permission. 77 * 78 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 79 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 80 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 81 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 82 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 83 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 84 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 85 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 86 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 87 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 88 * SUCH DAMAGE. 89 * 90 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 91 */ 92 93 #include <sys/cdefs.h> 94 __KERNEL_RCSID(0, "$NetBSD: ip_output.c,v 1.288 2017/12/22 11:22:37 ozaki-r Exp $"); 95 96 #ifdef _KERNEL_OPT 97 #include "opt_inet.h" 98 #include "opt_ipsec.h" 99 #include "opt_mrouting.h" 100 #include "opt_net_mpsafe.h" 101 #include "opt_mpls.h" 102 #endif 103 104 #include "arp.h" 105 106 #include <sys/param.h> 107 #include <sys/kmem.h> 108 #include <sys/mbuf.h> 109 #include <sys/socket.h> 110 #include <sys/socketvar.h> 111 #include <sys/kauth.h> 112 #include <sys/systm.h> 113 #include <sys/syslog.h> 114 115 #include <net/if.h> 116 #include <net/if_types.h> 117 #include <net/route.h> 118 #include <net/pfil.h> 119 120 #include <netinet/in.h> 121 #include <netinet/in_systm.h> 122 #include <netinet/ip.h> 123 #include <netinet/in_pcb.h> 124 #include <netinet/in_var.h> 125 #include <netinet/ip_var.h> 126 #include <netinet/ip_private.h> 127 #include <netinet/in_offload.h> 128 #include <netinet/portalgo.h> 129 #include <netinet/udp.h> 130 #include <netinet/udp_var.h> 131 132 #ifdef INET6 133 #include <netinet6/ip6_var.h> 134 #endif 135 136 #ifdef MROUTING 137 #include <netinet/ip_mroute.h> 138 #endif 139 140 #ifdef IPSEC 141 #include <netipsec/ipsec.h> 142 #include <netipsec/key.h> 143 #endif 144 145 #ifdef MPLS 146 #include <netmpls/mpls.h> 147 #include <netmpls/mpls_var.h> 148 #endif 149 150 static int ip_pcbopts(struct inpcb *, const struct sockopt *); 151 static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *); 152 static struct ifnet *ip_multicast_if(struct in_addr *, int *); 153 static void ip_mloopback(struct ifnet *, struct mbuf *, 154 const struct sockaddr_in *); 155 static int ip_ifaddrvalid(const struct in_ifaddr *); 156 157 extern pfil_head_t *inet_pfil_hook; /* XXX */ 158 159 int ip_do_loopback_cksum = 0; 160 161 static int 162 ip_mark_mpls(struct ifnet * const ifp, struct mbuf * const m, 163 const struct rtentry *rt) 164 { 165 int error = 0; 166 #ifdef MPLS 167 union mpls_shim msh; 168 169 if (rt == NULL || rt_gettag(rt) == NULL || 170 rt_gettag(rt)->sa_family != AF_MPLS || 171 (m->m_flags & (M_MCAST | M_BCAST)) != 0 || 172 ifp->if_type != IFT_ETHER) 173 return 0; 174 175 msh.s_addr = MPLS_GETSADDR(rt); 176 if (msh.shim.label != MPLS_LABEL_IMPLNULL) { 177 struct m_tag *mtag; 178 /* 179 * XXX tentative solution to tell ether_output 180 * it's MPLS. Need some more efficient solution. 181 */ 182 mtag = m_tag_get(PACKET_TAG_MPLS, 183 sizeof(int) /* dummy */, 184 M_NOWAIT); 185 if (mtag == NULL) 186 return ENOMEM; 187 m_tag_prepend(m, mtag); 188 } 189 #endif 190 return error; 191 } 192 193 /* 194 * Send an IP packet to a host. 195 */ 196 int 197 ip_if_output(struct ifnet * const ifp, struct mbuf * const m, 198 const struct sockaddr * const dst, const struct rtentry *rt) 199 { 200 int error = 0; 201 202 if (rt != NULL) { 203 error = rt_check_reject_route(rt, ifp); 204 if (error != 0) { 205 m_freem(m); 206 return error; 207 } 208 } 209 210 error = ip_mark_mpls(ifp, m, rt); 211 if (error != 0) { 212 m_freem(m); 213 return error; 214 } 215 216 error = if_output_lock(ifp, ifp, m, dst, rt); 217 218 return error; 219 } 220 221 /* 222 * IP output. The packet in mbuf chain m contains a skeletal IP 223 * header (with len, off, ttl, proto, tos, src, dst). 224 * The mbuf chain containing the packet will be freed. 225 * The mbuf opt, if present, will not be freed. 226 */ 227 int 228 ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro, int flags, 229 struct ip_moptions *imo, struct inpcb *inp) 230 { 231 struct rtentry *rt; 232 struct ip *ip; 233 struct ifnet *ifp, *mifp = NULL; 234 struct mbuf *m = m0; 235 int hlen = sizeof (struct ip); 236 int len, error = 0; 237 struct route iproute; 238 const struct sockaddr_in *dst; 239 struct in_ifaddr *ia = NULL; 240 struct ifaddr *ifa; 241 int isbroadcast; 242 int sw_csum; 243 u_long mtu; 244 bool natt_frag = false; 245 bool rtmtu_nolock; 246 union { 247 struct sockaddr sa; 248 struct sockaddr_in sin; 249 } udst, usrc; 250 struct sockaddr *rdst = &udst.sa; /* real IP destination, as 251 * opposed to the nexthop 252 */ 253 struct psref psref, psref_ia; 254 int bound; 255 bool bind_need_restore = false; 256 257 len = 0; 258 259 MCLAIM(m, &ip_tx_mowner); 260 261 KASSERT((m->m_flags & M_PKTHDR) != 0); 262 KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) == 0); 263 KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) != 264 (M_CSUM_TCPv4|M_CSUM_UDPv4)); 265 266 if (opt) { 267 m = ip_insertoptions(m, opt, &len); 268 if (len >= sizeof(struct ip)) 269 hlen = len; 270 } 271 ip = mtod(m, struct ip *); 272 273 /* 274 * Fill in IP header. 275 */ 276 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 277 ip->ip_v = IPVERSION; 278 ip->ip_off = htons(0); 279 /* ip->ip_id filled in after we find out source ia */ 280 ip->ip_hl = hlen >> 2; 281 IP_STATINC(IP_STAT_LOCALOUT); 282 } else { 283 hlen = ip->ip_hl << 2; 284 } 285 286 /* 287 * Route packet. 288 */ 289 if (ro == NULL) { 290 memset(&iproute, 0, sizeof(iproute)); 291 ro = &iproute; 292 } 293 sockaddr_in_init(&udst.sin, &ip->ip_dst, 0); 294 dst = satocsin(rtcache_getdst(ro)); 295 296 /* 297 * If there is a cached route, check that it is to the same 298 * destination and is still up. If not, free it and try again. 299 * The address family should also be checked in case of sharing 300 * the cache with IPv6. 301 */ 302 if (dst && (dst->sin_family != AF_INET || 303 !in_hosteq(dst->sin_addr, ip->ip_dst))) 304 rtcache_free(ro); 305 306 /* XXX must be before rtcache operations */ 307 bound = curlwp_bind(); 308 bind_need_restore = true; 309 310 if ((rt = rtcache_validate(ro)) == NULL && 311 (rt = rtcache_update(ro, 1)) == NULL) { 312 dst = &udst.sin; 313 error = rtcache_setdst(ro, &udst.sa); 314 if (error != 0) 315 goto bad; 316 } 317 318 /* 319 * If routing to interface only, short circuit routing lookup. 320 */ 321 if (flags & IP_ROUTETOIF) { 322 ifa = ifa_ifwithladdr_psref(sintocsa(dst), &psref_ia); 323 if (ifa == NULL) { 324 IP_STATINC(IP_STAT_NOROUTE); 325 error = ENETUNREACH; 326 goto bad; 327 } 328 /* ia is already referenced by psref_ia */ 329 ia = ifatoia(ifa); 330 331 ifp = ia->ia_ifp; 332 mtu = ifp->if_mtu; 333 ip->ip_ttl = 1; 334 isbroadcast = in_broadcast(dst->sin_addr, ifp); 335 } else if (((IN_MULTICAST(ip->ip_dst.s_addr) || 336 ip->ip_dst.s_addr == INADDR_BROADCAST) || 337 (flags & IP_ROUTETOIFINDEX)) && 338 imo != NULL && imo->imo_multicast_if_index != 0) { 339 ifp = mifp = if_get_byindex(imo->imo_multicast_if_index, &psref); 340 if (ifp == NULL) { 341 IP_STATINC(IP_STAT_NOROUTE); 342 error = ENETUNREACH; 343 goto bad; 344 } 345 mtu = ifp->if_mtu; 346 ia = in_get_ia_from_ifp_psref(ifp, &psref_ia); 347 if (ia == NULL) { 348 error = EADDRNOTAVAIL; 349 goto bad; 350 } 351 if (IN_MULTICAST(ip->ip_dst.s_addr) || 352 ip->ip_dst.s_addr == INADDR_BROADCAST) { 353 isbroadcast = 0; 354 } else { 355 /* IP_ROUTETOIFINDEX */ 356 isbroadcast = in_broadcast(dst->sin_addr, ifp); 357 if ((isbroadcast == 0) && ((ifp->if_flags & 358 (IFF_LOOPBACK | IFF_POINTOPOINT)) == 0) && 359 (in_direct(dst->sin_addr, ifp) == 0)) { 360 /* gateway address required */ 361 if (rt == NULL) 362 rt = rtcache_init(ro); 363 if (rt == NULL || rt->rt_ifp != ifp) { 364 IP_STATINC(IP_STAT_NOROUTE); 365 error = EHOSTUNREACH; 366 goto bad; 367 } 368 rt->rt_use++; 369 if (rt->rt_flags & RTF_GATEWAY) 370 dst = satosin(rt->rt_gateway); 371 if (rt->rt_flags & RTF_HOST) 372 isbroadcast = 373 rt->rt_flags & RTF_BROADCAST; 374 } 375 } 376 } else { 377 if (rt == NULL) 378 rt = rtcache_init(ro); 379 if (rt == NULL) { 380 IP_STATINC(IP_STAT_NOROUTE); 381 error = EHOSTUNREACH; 382 goto bad; 383 } 384 if (ifa_is_destroying(rt->rt_ifa)) { 385 rtcache_unref(rt, ro); 386 rt = NULL; 387 IP_STATINC(IP_STAT_NOROUTE); 388 error = EHOSTUNREACH; 389 goto bad; 390 } 391 ifa_acquire(rt->rt_ifa, &psref_ia); 392 ia = ifatoia(rt->rt_ifa); 393 ifp = rt->rt_ifp; 394 if ((mtu = rt->rt_rmx.rmx_mtu) == 0) 395 mtu = ifp->if_mtu; 396 rt->rt_use++; 397 if (rt->rt_flags & RTF_GATEWAY) 398 dst = satosin(rt->rt_gateway); 399 if (rt->rt_flags & RTF_HOST) 400 isbroadcast = rt->rt_flags & RTF_BROADCAST; 401 else 402 isbroadcast = in_broadcast(dst->sin_addr, ifp); 403 } 404 rtmtu_nolock = rt && (rt->rt_rmx.rmx_locks & RTV_MTU) == 0; 405 406 if (IN_MULTICAST(ip->ip_dst.s_addr) || 407 (ip->ip_dst.s_addr == INADDR_BROADCAST)) { 408 bool inmgroup; 409 410 m->m_flags |= (ip->ip_dst.s_addr == INADDR_BROADCAST) ? 411 M_BCAST : M_MCAST; 412 /* 413 * See if the caller provided any multicast options 414 */ 415 if (imo != NULL) 416 ip->ip_ttl = imo->imo_multicast_ttl; 417 else 418 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 419 420 /* 421 * if we don't know the outgoing ifp yet, we can't generate 422 * output 423 */ 424 if (!ifp) { 425 IP_STATINC(IP_STAT_NOROUTE); 426 error = ENETUNREACH; 427 goto bad; 428 } 429 430 /* 431 * If the packet is multicast or broadcast, confirm that 432 * the outgoing interface can transmit it. 433 */ 434 if (((m->m_flags & M_MCAST) && 435 (ifp->if_flags & IFF_MULTICAST) == 0) || 436 ((m->m_flags & M_BCAST) && 437 (ifp->if_flags & (IFF_BROADCAST|IFF_POINTOPOINT)) == 0)) { 438 IP_STATINC(IP_STAT_NOROUTE); 439 error = ENETUNREACH; 440 goto bad; 441 } 442 /* 443 * If source address not specified yet, use an address 444 * of outgoing interface. 445 */ 446 if (in_nullhost(ip->ip_src)) { 447 struct in_ifaddr *xia; 448 struct ifaddr *xifa; 449 struct psref _psref; 450 451 xia = in_get_ia_from_ifp_psref(ifp, &_psref); 452 if (!xia) { 453 error = EADDRNOTAVAIL; 454 goto bad; 455 } 456 xifa = &xia->ia_ifa; 457 if (xifa->ifa_getifa != NULL) { 458 ia4_release(xia, &_psref); 459 /* FIXME ifa_getifa is NOMPSAFE */ 460 xia = ifatoia((*xifa->ifa_getifa)(xifa, rdst)); 461 if (xia == NULL) { 462 error = EADDRNOTAVAIL; 463 goto bad; 464 } 465 ia4_acquire(xia, &_psref); 466 } 467 ip->ip_src = xia->ia_addr.sin_addr; 468 ia4_release(xia, &_psref); 469 } 470 471 inmgroup = in_multi_group(ip->ip_dst, ifp, flags); 472 if (inmgroup && (imo == NULL || imo->imo_multicast_loop)) { 473 /* 474 * If we belong to the destination multicast group 475 * on the outgoing interface, and the caller did not 476 * forbid loopback, loop back a copy. 477 */ 478 ip_mloopback(ifp, m, &udst.sin); 479 } 480 #ifdef MROUTING 481 else { 482 /* 483 * If we are acting as a multicast router, perform 484 * multicast forwarding as if the packet had just 485 * arrived on the interface to which we are about 486 * to send. The multicast forwarding function 487 * recursively calls this function, using the 488 * IP_FORWARDING flag to prevent infinite recursion. 489 * 490 * Multicasts that are looped back by ip_mloopback(), 491 * above, will be forwarded by the ip_input() routine, 492 * if necessary. 493 */ 494 extern struct socket *ip_mrouter; 495 496 if (ip_mrouter && (flags & IP_FORWARDING) == 0) { 497 if (ip_mforward(m, ifp) != 0) { 498 m_freem(m); 499 goto done; 500 } 501 } 502 } 503 #endif 504 /* 505 * Multicasts with a time-to-live of zero may be looped- 506 * back, above, but must not be transmitted on a network. 507 * Also, multicasts addressed to the loopback interface 508 * are not sent -- the above call to ip_mloopback() will 509 * loop back a copy if this host actually belongs to the 510 * destination group on the loopback interface. 511 */ 512 if (ip->ip_ttl == 0 || (ifp->if_flags & IFF_LOOPBACK) != 0) { 513 m_freem(m); 514 goto done; 515 } 516 goto sendit; 517 } 518 519 /* 520 * If source address not specified yet, use address 521 * of outgoing interface. 522 */ 523 if (in_nullhost(ip->ip_src)) { 524 struct ifaddr *xifa; 525 526 xifa = &ia->ia_ifa; 527 if (xifa->ifa_getifa != NULL) { 528 ia4_release(ia, &psref_ia); 529 /* FIXME ifa_getifa is NOMPSAFE */ 530 ia = ifatoia((*xifa->ifa_getifa)(xifa, rdst)); 531 if (ia == NULL) { 532 error = EADDRNOTAVAIL; 533 goto bad; 534 } 535 ia4_acquire(ia, &psref_ia); 536 } 537 ip->ip_src = ia->ia_addr.sin_addr; 538 } 539 540 /* 541 * packets with Class-D address as source are not valid per 542 * RFC 1112 543 */ 544 if (IN_MULTICAST(ip->ip_src.s_addr)) { 545 IP_STATINC(IP_STAT_ODROPPED); 546 error = EADDRNOTAVAIL; 547 goto bad; 548 } 549 550 /* 551 * Look for broadcast address and and verify user is allowed to 552 * send such a packet. 553 */ 554 if (isbroadcast) { 555 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 556 error = EADDRNOTAVAIL; 557 goto bad; 558 } 559 if ((flags & IP_ALLOWBROADCAST) == 0) { 560 error = EACCES; 561 goto bad; 562 } 563 /* don't allow broadcast messages to be fragmented */ 564 if (ntohs(ip->ip_len) > ifp->if_mtu) { 565 error = EMSGSIZE; 566 goto bad; 567 } 568 m->m_flags |= M_BCAST; 569 } else 570 m->m_flags &= ~M_BCAST; 571 572 sendit: 573 if ((flags & (IP_FORWARDING|IP_NOIPNEWID)) == 0) { 574 if (m->m_pkthdr.len < IP_MINFRAGSIZE) { 575 ip->ip_id = 0; 576 } else if ((m->m_pkthdr.csum_flags & M_CSUM_TSOv4) == 0) { 577 ip->ip_id = ip_newid(ia); 578 } else { 579 580 /* 581 * TSO capable interfaces (typically?) increment 582 * ip_id for each segment. 583 * "allocate" enough ids here to increase the chance 584 * for them to be unique. 585 * 586 * note that the following calculation is not 587 * needed to be precise. wasting some ip_id is fine. 588 */ 589 590 unsigned int segsz = m->m_pkthdr.segsz; 591 unsigned int datasz = ntohs(ip->ip_len) - hlen; 592 unsigned int num = howmany(datasz, segsz); 593 594 ip->ip_id = ip_newid_range(ia, num); 595 } 596 } 597 if (ia != NULL) { 598 ia4_release(ia, &psref_ia); 599 ia = NULL; 600 } 601 602 /* 603 * If we're doing Path MTU Discovery, we need to set DF unless 604 * the route's MTU is locked. 605 */ 606 if ((flags & IP_MTUDISC) != 0 && rtmtu_nolock) { 607 ip->ip_off |= htons(IP_DF); 608 } 609 610 #ifdef IPSEC 611 if (ipsec_used) { 612 bool ipsec_done = false; 613 614 /* Perform IPsec processing, if any. */ 615 error = ipsec4_output(m, inp, flags, &mtu, &natt_frag, 616 &ipsec_done); 617 if (error || ipsec_done) 618 goto done; 619 } 620 #endif 621 622 /* 623 * Run through list of hooks for output packets. 624 */ 625 error = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_OUT); 626 if (error) 627 goto done; 628 if (m == NULL) 629 goto done; 630 631 ip = mtod(m, struct ip *); 632 hlen = ip->ip_hl << 2; 633 634 m->m_pkthdr.csum_data |= hlen << 16; 635 636 /* 637 * search for the source address structure to 638 * maintain output statistics, and verify address 639 * validity 640 */ 641 KASSERT(ia == NULL); 642 sockaddr_in_init(&usrc.sin, &ip->ip_src, 0); 643 ifa = ifaof_ifpforaddr_psref(&usrc.sa, ifp, &psref_ia); 644 if (ifa != NULL) 645 ia = ifatoia(ifa); 646 647 /* 648 * Ensure we only send from a valid address. 649 * A NULL address is valid because the packet could be 650 * generated from a packet filter. 651 */ 652 if (ia != NULL && (flags & IP_FORWARDING) == 0 && 653 (error = ip_ifaddrvalid(ia)) != 0) 654 { 655 ARPLOG(LOG_ERR, 656 "refusing to send from invalid address %s (pid %d)\n", 657 ARPLOGADDR(&ip->ip_src), curproc->p_pid); 658 IP_STATINC(IP_STAT_ODROPPED); 659 if (error == 1) 660 /* 661 * Address exists, but is tentative or detached. 662 * We can't send from it because it's invalid, 663 * so we drop the packet. 664 */ 665 error = 0; 666 else 667 error = EADDRNOTAVAIL; 668 goto bad; 669 } 670 671 /* Maybe skip checksums on loopback interfaces. */ 672 if (IN_NEED_CHECKSUM(ifp, M_CSUM_IPv4)) { 673 m->m_pkthdr.csum_flags |= M_CSUM_IPv4; 674 } 675 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_csum_flags_tx; 676 /* 677 * If small enough for mtu of path, or if using TCP segmentation 678 * offload, can just send directly. 679 */ 680 if (ntohs(ip->ip_len) <= mtu || 681 (m->m_pkthdr.csum_flags & M_CSUM_TSOv4) != 0) { 682 const struct sockaddr *sa; 683 684 #if IFA_STATS 685 if (ia) 686 ia->ia_ifa.ifa_data.ifad_outbytes += ntohs(ip->ip_len); 687 #endif 688 /* 689 * Always initialize the sum to 0! Some HW assisted 690 * checksumming requires this. 691 */ 692 ip->ip_sum = 0; 693 694 if ((m->m_pkthdr.csum_flags & M_CSUM_TSOv4) == 0) { 695 /* 696 * Perform any checksums that the hardware can't do 697 * for us. 698 * 699 * XXX Does any hardware require the {th,uh}_sum 700 * XXX fields to be 0? 701 */ 702 if (sw_csum & M_CSUM_IPv4) { 703 KASSERT(IN_NEED_CHECKSUM(ifp, M_CSUM_IPv4)); 704 ip->ip_sum = in_cksum(m, hlen); 705 m->m_pkthdr.csum_flags &= ~M_CSUM_IPv4; 706 } 707 if (sw_csum & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 708 if (IN_NEED_CHECKSUM(ifp, 709 sw_csum & (M_CSUM_TCPv4|M_CSUM_UDPv4))) { 710 in_delayed_cksum(m); 711 } 712 m->m_pkthdr.csum_flags &= 713 ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 714 } 715 } 716 717 sa = (m->m_flags & M_MCAST) ? sintocsa(rdst) : sintocsa(dst); 718 if (__predict_true( 719 (m->m_pkthdr.csum_flags & M_CSUM_TSOv4) == 0 || 720 (ifp->if_capenable & IFCAP_TSOv4) != 0)) { 721 error = ip_if_output(ifp, m, sa, rt); 722 } else { 723 error = ip_tso_output(ifp, m, sa, rt); 724 } 725 goto done; 726 } 727 728 /* 729 * We can't use HW checksumming if we're about to 730 * fragment the packet. 731 * 732 * XXX Some hardware can do this. 733 */ 734 if (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 735 if (IN_NEED_CHECKSUM(ifp, 736 m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4))) { 737 in_delayed_cksum(m); 738 } 739 m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 740 } 741 742 /* 743 * Too large for interface; fragment if possible. 744 * Must be able to put at least 8 bytes per fragment. 745 */ 746 if (ntohs(ip->ip_off) & IP_DF) { 747 if (flags & IP_RETURNMTU) { 748 KASSERT(inp != NULL); 749 inp->inp_errormtu = mtu; 750 } 751 error = EMSGSIZE; 752 IP_STATINC(IP_STAT_CANTFRAG); 753 goto bad; 754 } 755 756 error = ip_fragment(m, ifp, mtu); 757 if (error) { 758 m = NULL; 759 goto bad; 760 } 761 762 for (; m; m = m0) { 763 m0 = m->m_nextpkt; 764 m->m_nextpkt = 0; 765 if (error) { 766 m_freem(m); 767 continue; 768 } 769 #if IFA_STATS 770 if (ia) 771 ia->ia_ifa.ifa_data.ifad_outbytes += ntohs(ip->ip_len); 772 #endif 773 /* 774 * If we get there, the packet has not been handled by 775 * IPsec whereas it should have. Now that it has been 776 * fragmented, re-inject it in ip_output so that IPsec 777 * processing can occur. 778 */ 779 if (natt_frag) { 780 error = ip_output(m, opt, ro, 781 flags | IP_RAWOUTPUT | IP_NOIPNEWID, 782 imo, inp); 783 } else { 784 KASSERT((m->m_pkthdr.csum_flags & 785 (M_CSUM_UDPv4 | M_CSUM_TCPv4)) == 0); 786 error = ip_if_output(ifp, m, 787 (m->m_flags & M_MCAST) ? 788 sintocsa(rdst) : sintocsa(dst), rt); 789 } 790 } 791 if (error == 0) { 792 IP_STATINC(IP_STAT_FRAGMENTED); 793 } 794 done: 795 ia4_release(ia, &psref_ia); 796 rtcache_unref(rt, ro); 797 if (ro == &iproute) { 798 rtcache_free(&iproute); 799 } 800 if (mifp != NULL) { 801 if_put(mifp, &psref); 802 } 803 if (bind_need_restore) 804 curlwp_bindx(bound); 805 return error; 806 bad: 807 m_freem(m); 808 goto done; 809 } 810 811 int 812 ip_fragment(struct mbuf *m, struct ifnet *ifp, u_long mtu) 813 { 814 struct ip *ip, *mhip; 815 struct mbuf *m0; 816 int len, hlen, off; 817 int mhlen, firstlen; 818 struct mbuf **mnext; 819 int sw_csum = m->m_pkthdr.csum_flags; 820 int fragments = 0; 821 int error = 0; 822 823 ip = mtod(m, struct ip *); 824 hlen = ip->ip_hl << 2; 825 if (ifp != NULL) 826 sw_csum &= ~ifp->if_csum_flags_tx; 827 828 len = (mtu - hlen) &~ 7; 829 if (len < 8) { 830 m_freem(m); 831 return (EMSGSIZE); 832 } 833 834 firstlen = len; 835 mnext = &m->m_nextpkt; 836 837 /* 838 * Loop through length of segment after first fragment, 839 * make new header and copy data of each part and link onto chain. 840 */ 841 m0 = m; 842 mhlen = sizeof (struct ip); 843 for (off = hlen + len; off < ntohs(ip->ip_len); off += len) { 844 MGETHDR(m, M_DONTWAIT, MT_HEADER); 845 if (m == 0) { 846 error = ENOBUFS; 847 IP_STATINC(IP_STAT_ODROPPED); 848 goto sendorfree; 849 } 850 MCLAIM(m, m0->m_owner); 851 *mnext = m; 852 mnext = &m->m_nextpkt; 853 m->m_data += max_linkhdr; 854 mhip = mtod(m, struct ip *); 855 *mhip = *ip; 856 /* we must inherit MCAST and BCAST flags */ 857 m->m_flags |= m0->m_flags & (M_MCAST|M_BCAST); 858 if (hlen > sizeof (struct ip)) { 859 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 860 mhip->ip_hl = mhlen >> 2; 861 } 862 m->m_len = mhlen; 863 mhip->ip_off = ((off - hlen) >> 3) + 864 (ntohs(ip->ip_off) & ~IP_MF); 865 if (ip->ip_off & htons(IP_MF)) 866 mhip->ip_off |= IP_MF; 867 if (off + len >= ntohs(ip->ip_len)) 868 len = ntohs(ip->ip_len) - off; 869 else 870 mhip->ip_off |= IP_MF; 871 HTONS(mhip->ip_off); 872 mhip->ip_len = htons((u_int16_t)(len + mhlen)); 873 m->m_next = m_copym(m0, off, len, M_DONTWAIT); 874 if (m->m_next == 0) { 875 error = ENOBUFS; /* ??? */ 876 IP_STATINC(IP_STAT_ODROPPED); 877 goto sendorfree; 878 } 879 m->m_pkthdr.len = mhlen + len; 880 m_reset_rcvif(m); 881 mhip->ip_sum = 0; 882 KASSERT((m->m_pkthdr.csum_flags & M_CSUM_IPv4) == 0); 883 if (sw_csum & M_CSUM_IPv4) { 884 mhip->ip_sum = in_cksum(m, mhlen); 885 } else { 886 /* 887 * checksum is hw-offloaded or not necessary. 888 */ 889 m->m_pkthdr.csum_flags |= 890 m0->m_pkthdr.csum_flags & M_CSUM_IPv4; 891 m->m_pkthdr.csum_data |= mhlen << 16; 892 KASSERT(!(ifp != NULL && 893 IN_NEED_CHECKSUM(ifp, M_CSUM_IPv4)) || 894 (m->m_pkthdr.csum_flags & M_CSUM_IPv4) != 0); 895 } 896 IP_STATINC(IP_STAT_OFRAGMENTS); 897 fragments++; 898 } 899 /* 900 * Update first fragment by trimming what's been copied out 901 * and updating header, then send each fragment (in order). 902 */ 903 m = m0; 904 m_adj(m, hlen + firstlen - ntohs(ip->ip_len)); 905 m->m_pkthdr.len = hlen + firstlen; 906 ip->ip_len = htons((u_int16_t)m->m_pkthdr.len); 907 ip->ip_off |= htons(IP_MF); 908 ip->ip_sum = 0; 909 if (sw_csum & M_CSUM_IPv4) { 910 ip->ip_sum = in_cksum(m, hlen); 911 m->m_pkthdr.csum_flags &= ~M_CSUM_IPv4; 912 } else { 913 /* 914 * checksum is hw-offloaded or not necessary. 915 */ 916 KASSERT(!(ifp != NULL && IN_NEED_CHECKSUM(ifp, M_CSUM_IPv4)) || 917 (m->m_pkthdr.csum_flags & M_CSUM_IPv4) != 0); 918 KASSERT(M_CSUM_DATA_IPv4_IPHL(m->m_pkthdr.csum_data) >= 919 sizeof(struct ip)); 920 } 921 sendorfree: 922 /* 923 * If there is no room for all the fragments, don't queue 924 * any of them. 925 */ 926 if (ifp != NULL) { 927 IFQ_LOCK(&ifp->if_snd); 928 if (ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len < fragments && 929 error == 0) { 930 error = ENOBUFS; 931 IP_STATINC(IP_STAT_ODROPPED); 932 IFQ_INC_DROPS(&ifp->if_snd); 933 } 934 IFQ_UNLOCK(&ifp->if_snd); 935 } 936 if (error) { 937 for (m = m0; m; m = m0) { 938 m0 = m->m_nextpkt; 939 m->m_nextpkt = NULL; 940 m_freem(m); 941 } 942 } 943 return (error); 944 } 945 946 /* 947 * Process a delayed payload checksum calculation. 948 */ 949 void 950 in_delayed_cksum(struct mbuf *m) 951 { 952 struct ip *ip; 953 u_int16_t csum, offset; 954 955 ip = mtod(m, struct ip *); 956 offset = ip->ip_hl << 2; 957 csum = in4_cksum(m, 0, offset, ntohs(ip->ip_len) - offset); 958 if (csum == 0 && (m->m_pkthdr.csum_flags & M_CSUM_UDPv4) != 0) 959 csum = 0xffff; 960 961 offset += M_CSUM_DATA_IPv4_OFFSET(m->m_pkthdr.csum_data); 962 963 if ((offset + sizeof(u_int16_t)) > m->m_len) { 964 /* This happen when ip options were inserted 965 printf("in_delayed_cksum: pullup len %d off %d proto %d\n", 966 m->m_len, offset, ip->ip_p); 967 */ 968 m_copyback(m, offset, sizeof(csum), (void *) &csum); 969 } else 970 *(u_int16_t *)(mtod(m, char *) + offset) = csum; 971 } 972 973 /* 974 * Determine the maximum length of the options to be inserted; 975 * we would far rather allocate too much space rather than too little. 976 */ 977 978 u_int 979 ip_optlen(struct inpcb *inp) 980 { 981 struct mbuf *m = inp->inp_options; 982 983 if (m && m->m_len > offsetof(struct ipoption, ipopt_dst)) { 984 return (m->m_len - offsetof(struct ipoption, ipopt_dst)); 985 } 986 return 0; 987 } 988 989 /* 990 * Insert IP options into preformed packet. 991 * Adjust IP destination as required for IP source routing, 992 * as indicated by a non-zero in_addr at the start of the options. 993 */ 994 static struct mbuf * 995 ip_insertoptions(struct mbuf *m, struct mbuf *opt, int *phlen) 996 { 997 struct ipoption *p = mtod(opt, struct ipoption *); 998 struct mbuf *n; 999 struct ip *ip = mtod(m, struct ip *); 1000 unsigned optlen; 1001 1002 optlen = opt->m_len - sizeof(p->ipopt_dst); 1003 if (optlen + ntohs(ip->ip_len) > IP_MAXPACKET) 1004 return (m); /* XXX should fail */ 1005 if (!in_nullhost(p->ipopt_dst)) 1006 ip->ip_dst = p->ipopt_dst; 1007 if (M_READONLY(m) || M_LEADINGSPACE(m) < optlen) { 1008 MGETHDR(n, M_DONTWAIT, MT_HEADER); 1009 if (n == 0) 1010 return (m); 1011 MCLAIM(n, m->m_owner); 1012 M_MOVE_PKTHDR(n, m); 1013 m->m_len -= sizeof(struct ip); 1014 m->m_data += sizeof(struct ip); 1015 n->m_next = m; 1016 m = n; 1017 m->m_len = optlen + sizeof(struct ip); 1018 m->m_data += max_linkhdr; 1019 bcopy((void *)ip, mtod(m, void *), sizeof(struct ip)); 1020 } else { 1021 m->m_data -= optlen; 1022 m->m_len += optlen; 1023 memmove(mtod(m, void *), ip, sizeof(struct ip)); 1024 } 1025 m->m_pkthdr.len += optlen; 1026 ip = mtod(m, struct ip *); 1027 bcopy((void *)p->ipopt_list, (void *)(ip + 1), (unsigned)optlen); 1028 *phlen = sizeof(struct ip) + optlen; 1029 ip->ip_len = htons(ntohs(ip->ip_len) + optlen); 1030 return (m); 1031 } 1032 1033 /* 1034 * Copy options from ip to jp, 1035 * omitting those not copied during fragmentation. 1036 */ 1037 int 1038 ip_optcopy(struct ip *ip, struct ip *jp) 1039 { 1040 u_char *cp, *dp; 1041 int opt, optlen, cnt; 1042 1043 cp = (u_char *)(ip + 1); 1044 dp = (u_char *)(jp + 1); 1045 cnt = (ip->ip_hl << 2) - sizeof (struct ip); 1046 for (; cnt > 0; cnt -= optlen, cp += optlen) { 1047 opt = cp[0]; 1048 if (opt == IPOPT_EOL) 1049 break; 1050 if (opt == IPOPT_NOP) { 1051 /* Preserve for IP mcast tunnel's LSRR alignment. */ 1052 *dp++ = IPOPT_NOP; 1053 optlen = 1; 1054 continue; 1055 } 1056 1057 KASSERT(cnt >= IPOPT_OLEN + sizeof(*cp)); 1058 optlen = cp[IPOPT_OLEN]; 1059 KASSERT(optlen >= IPOPT_OLEN + sizeof(*cp) && optlen < cnt); 1060 1061 /* Invalid lengths should have been caught by ip_dooptions. */ 1062 if (optlen > cnt) 1063 optlen = cnt; 1064 if (IPOPT_COPIED(opt)) { 1065 bcopy((void *)cp, (void *)dp, (unsigned)optlen); 1066 dp += optlen; 1067 } 1068 } 1069 for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++) 1070 *dp++ = IPOPT_EOL; 1071 return (optlen); 1072 } 1073 1074 /* 1075 * IP socket option processing. 1076 */ 1077 int 1078 ip_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1079 { 1080 struct inpcb *inp = sotoinpcb(so); 1081 struct ip *ip = &inp->inp_ip; 1082 int inpflags = inp->inp_flags; 1083 int optval = 0, error = 0; 1084 1085 KASSERT(solocked(so)); 1086 1087 if (sopt->sopt_level != IPPROTO_IP) { 1088 if (sopt->sopt_level == SOL_SOCKET && sopt->sopt_name == SO_NOHEADER) 1089 return 0; 1090 return ENOPROTOOPT; 1091 } 1092 1093 switch (op) { 1094 case PRCO_SETOPT: 1095 switch (sopt->sopt_name) { 1096 case IP_OPTIONS: 1097 #ifdef notyet 1098 case IP_RETOPTS: 1099 #endif 1100 error = ip_pcbopts(inp, sopt); 1101 break; 1102 1103 case IP_TOS: 1104 case IP_TTL: 1105 case IP_MINTTL: 1106 case IP_PKTINFO: 1107 case IP_RECVOPTS: 1108 case IP_RECVRETOPTS: 1109 case IP_RECVDSTADDR: 1110 case IP_RECVIF: 1111 case IP_RECVPKTINFO: 1112 case IP_RECVTTL: 1113 error = sockopt_getint(sopt, &optval); 1114 if (error) 1115 break; 1116 1117 switch (sopt->sopt_name) { 1118 case IP_TOS: 1119 ip->ip_tos = optval; 1120 break; 1121 1122 case IP_TTL: 1123 ip->ip_ttl = optval; 1124 break; 1125 1126 case IP_MINTTL: 1127 if (optval > 0 && optval <= MAXTTL) 1128 inp->inp_ip_minttl = optval; 1129 else 1130 error = EINVAL; 1131 break; 1132 #define OPTSET(bit) \ 1133 if (optval) \ 1134 inpflags |= bit; \ 1135 else \ 1136 inpflags &= ~bit; 1137 1138 case IP_PKTINFO: 1139 OPTSET(INP_PKTINFO); 1140 break; 1141 1142 case IP_RECVOPTS: 1143 OPTSET(INP_RECVOPTS); 1144 break; 1145 1146 case IP_RECVPKTINFO: 1147 OPTSET(INP_RECVPKTINFO); 1148 break; 1149 1150 case IP_RECVRETOPTS: 1151 OPTSET(INP_RECVRETOPTS); 1152 break; 1153 1154 case IP_RECVDSTADDR: 1155 OPTSET(INP_RECVDSTADDR); 1156 break; 1157 1158 case IP_RECVIF: 1159 OPTSET(INP_RECVIF); 1160 break; 1161 1162 case IP_RECVTTL: 1163 OPTSET(INP_RECVTTL); 1164 break; 1165 } 1166 break; 1167 #undef OPTSET 1168 1169 case IP_MULTICAST_IF: 1170 case IP_MULTICAST_TTL: 1171 case IP_MULTICAST_LOOP: 1172 case IP_ADD_MEMBERSHIP: 1173 case IP_DROP_MEMBERSHIP: 1174 error = ip_setmoptions(&inp->inp_moptions, sopt); 1175 break; 1176 1177 case IP_PORTRANGE: 1178 error = sockopt_getint(sopt, &optval); 1179 if (error) 1180 break; 1181 1182 switch (optval) { 1183 case IP_PORTRANGE_DEFAULT: 1184 case IP_PORTRANGE_HIGH: 1185 inpflags &= ~(INP_LOWPORT); 1186 break; 1187 1188 case IP_PORTRANGE_LOW: 1189 inpflags |= INP_LOWPORT; 1190 break; 1191 1192 default: 1193 error = EINVAL; 1194 break; 1195 } 1196 break; 1197 1198 case IP_PORTALGO: 1199 error = sockopt_getint(sopt, &optval); 1200 if (error) 1201 break; 1202 1203 error = portalgo_algo_index_select( 1204 (struct inpcb_hdr *)inp, optval); 1205 break; 1206 1207 #if defined(IPSEC) 1208 case IP_IPSEC_POLICY: 1209 if (ipsec_enabled) { 1210 error = ipsec4_set_policy(inp, sopt->sopt_name, 1211 sopt->sopt_data, sopt->sopt_size, 1212 curlwp->l_cred); 1213 break; 1214 } 1215 /*FALLTHROUGH*/ 1216 #endif /* IPSEC */ 1217 1218 default: 1219 error = ENOPROTOOPT; 1220 break; 1221 } 1222 break; 1223 1224 case PRCO_GETOPT: 1225 switch (sopt->sopt_name) { 1226 case IP_OPTIONS: 1227 case IP_RETOPTS: { 1228 struct mbuf *mopts = inp->inp_options; 1229 1230 if (mopts) { 1231 struct mbuf *m; 1232 1233 m = m_copym(mopts, 0, M_COPYALL, M_DONTWAIT); 1234 if (m == NULL) { 1235 error = ENOBUFS; 1236 break; 1237 } 1238 error = sockopt_setmbuf(sopt, m); 1239 } 1240 break; 1241 } 1242 case IP_PKTINFO: 1243 case IP_TOS: 1244 case IP_TTL: 1245 case IP_MINTTL: 1246 case IP_RECVOPTS: 1247 case IP_RECVRETOPTS: 1248 case IP_RECVDSTADDR: 1249 case IP_RECVIF: 1250 case IP_RECVPKTINFO: 1251 case IP_RECVTTL: 1252 case IP_ERRORMTU: 1253 switch (sopt->sopt_name) { 1254 case IP_TOS: 1255 optval = ip->ip_tos; 1256 break; 1257 1258 case IP_TTL: 1259 optval = ip->ip_ttl; 1260 break; 1261 1262 case IP_MINTTL: 1263 optval = inp->inp_ip_minttl; 1264 break; 1265 1266 case IP_ERRORMTU: 1267 optval = inp->inp_errormtu; 1268 break; 1269 1270 #define OPTBIT(bit) (inpflags & bit ? 1 : 0) 1271 1272 case IP_PKTINFO: 1273 optval = OPTBIT(INP_PKTINFO); 1274 break; 1275 1276 case IP_RECVOPTS: 1277 optval = OPTBIT(INP_RECVOPTS); 1278 break; 1279 1280 case IP_RECVPKTINFO: 1281 optval = OPTBIT(INP_RECVPKTINFO); 1282 break; 1283 1284 case IP_RECVRETOPTS: 1285 optval = OPTBIT(INP_RECVRETOPTS); 1286 break; 1287 1288 case IP_RECVDSTADDR: 1289 optval = OPTBIT(INP_RECVDSTADDR); 1290 break; 1291 1292 case IP_RECVIF: 1293 optval = OPTBIT(INP_RECVIF); 1294 break; 1295 1296 case IP_RECVTTL: 1297 optval = OPTBIT(INP_RECVTTL); 1298 break; 1299 } 1300 error = sockopt_setint(sopt, optval); 1301 break; 1302 1303 #if 0 /* defined(IPSEC) */ 1304 case IP_IPSEC_POLICY: 1305 { 1306 struct mbuf *m = NULL; 1307 1308 /* XXX this will return EINVAL as sopt is empty */ 1309 error = ipsec4_get_policy(inp, sopt->sopt_data, 1310 sopt->sopt_size, &m); 1311 if (error == 0) 1312 error = sockopt_setmbuf(sopt, m); 1313 break; 1314 } 1315 #endif /*IPSEC*/ 1316 1317 case IP_MULTICAST_IF: 1318 case IP_MULTICAST_TTL: 1319 case IP_MULTICAST_LOOP: 1320 case IP_ADD_MEMBERSHIP: 1321 case IP_DROP_MEMBERSHIP: 1322 error = ip_getmoptions(inp->inp_moptions, sopt); 1323 break; 1324 1325 case IP_PORTRANGE: 1326 if (inpflags & INP_LOWPORT) 1327 optval = IP_PORTRANGE_LOW; 1328 else 1329 optval = IP_PORTRANGE_DEFAULT; 1330 error = sockopt_setint(sopt, optval); 1331 break; 1332 1333 case IP_PORTALGO: 1334 optval = inp->inp_portalgo; 1335 error = sockopt_setint(sopt, optval); 1336 break; 1337 1338 default: 1339 error = ENOPROTOOPT; 1340 break; 1341 } 1342 break; 1343 } 1344 1345 if (!error) { 1346 inp->inp_flags = inpflags; 1347 } 1348 return error; 1349 } 1350 1351 static int 1352 ip_pktinfo_prepare(const struct in_pktinfo *pktinfo, struct ip_pktopts *pktopts, 1353 int *flags, kauth_cred_t cred) 1354 { 1355 struct ip_moptions *imo; 1356 int error = 0; 1357 bool addrset = false; 1358 1359 if (!in_nullhost(pktinfo->ipi_addr)) { 1360 pktopts->ippo_laddr.sin_addr = pktinfo->ipi_addr; 1361 /* EADDRNOTAVAIL? */ 1362 error = in_pcbbindableaddr(&pktopts->ippo_laddr, cred); 1363 if (error != 0) 1364 return error; 1365 addrset = true; 1366 } 1367 1368 if (pktinfo->ipi_ifindex != 0) { 1369 if (!addrset) { 1370 struct ifnet *ifp; 1371 struct in_ifaddr *ia; 1372 int s; 1373 1374 /* pick up primary address */ 1375 s = pserialize_read_enter(); 1376 ifp = if_byindex(pktinfo->ipi_ifindex); 1377 if (ifp == NULL) { 1378 pserialize_read_exit(s); 1379 return EADDRNOTAVAIL; 1380 } 1381 ia = in_get_ia_from_ifp(ifp); 1382 if (ia == NULL) { 1383 pserialize_read_exit(s); 1384 return EADDRNOTAVAIL; 1385 } 1386 pktopts->ippo_laddr.sin_addr = IA_SIN(ia)->sin_addr; 1387 pserialize_read_exit(s); 1388 } 1389 1390 /* 1391 * If specified ipi_ifindex, 1392 * use copied or locally initialized ip_moptions. 1393 * Original ip_moptions must not be modified. 1394 */ 1395 imo = &pktopts->ippo_imobuf; /* local buf in pktopts */ 1396 if (pktopts->ippo_imo != NULL) { 1397 memcpy(imo, pktopts->ippo_imo, sizeof(*imo)); 1398 } else { 1399 memset(imo, 0, sizeof(*imo)); 1400 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; 1401 imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP; 1402 } 1403 imo->imo_multicast_if_index = pktinfo->ipi_ifindex; 1404 pktopts->ippo_imo = imo; 1405 *flags |= IP_ROUTETOIFINDEX; 1406 } 1407 return error; 1408 } 1409 1410 /* 1411 * Set up IP outgoing packet options. Even if control is NULL, 1412 * pktopts->ippo_laddr and pktopts->ippo_imo are set and used. 1413 */ 1414 int 1415 ip_setpktopts(struct mbuf *control, struct ip_pktopts *pktopts, int *flags, 1416 struct inpcb *inp, kauth_cred_t cred) 1417 { 1418 struct cmsghdr *cm; 1419 struct in_pktinfo *pktinfo; 1420 int error; 1421 1422 pktopts->ippo_imo = inp->inp_moptions; 1423 sockaddr_in_init(&pktopts->ippo_laddr, &inp->inp_laddr, 0); 1424 1425 if (control == NULL) 1426 return 0; 1427 1428 /* 1429 * XXX: Currently, we assume all the optional information is 1430 * stored in a single mbuf. 1431 */ 1432 if (control->m_next) 1433 return EINVAL; 1434 1435 for (; control->m_len > 0; 1436 control->m_data += CMSG_ALIGN(cm->cmsg_len), 1437 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 1438 cm = mtod(control, struct cmsghdr *); 1439 if ((control->m_len < sizeof(*cm)) || 1440 (cm->cmsg_len == 0) || 1441 (cm->cmsg_len > control->m_len)) { 1442 return EINVAL; 1443 } 1444 if (cm->cmsg_level != IPPROTO_IP) 1445 continue; 1446 1447 switch (cm->cmsg_type) { 1448 case IP_PKTINFO: 1449 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 1450 return EINVAL; 1451 1452 pktinfo = (struct in_pktinfo *)CMSG_DATA(cm); 1453 error = ip_pktinfo_prepare(pktinfo, pktopts, flags, 1454 cred); 1455 if (error != 0) 1456 return error; 1457 break; 1458 default: 1459 return ENOPROTOOPT; 1460 } 1461 } 1462 return 0; 1463 } 1464 1465 /* 1466 * Set up IP options in pcb for insertion in output packets. 1467 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1468 * with destination address if source routed. 1469 */ 1470 static int 1471 ip_pcbopts(struct inpcb *inp, const struct sockopt *sopt) 1472 { 1473 struct mbuf *m; 1474 const u_char *cp; 1475 u_char *dp; 1476 int cnt; 1477 1478 KASSERT(inp_locked(inp)); 1479 1480 /* Turn off any old options. */ 1481 if (inp->inp_options) { 1482 m_free(inp->inp_options); 1483 } 1484 inp->inp_options = NULL; 1485 if ((cnt = sopt->sopt_size) == 0) { 1486 /* Only turning off any previous options. */ 1487 return 0; 1488 } 1489 cp = sopt->sopt_data; 1490 1491 #ifndef __vax__ 1492 if (cnt % sizeof(int32_t)) 1493 return (EINVAL); 1494 #endif 1495 1496 m = m_get(M_DONTWAIT, MT_SOOPTS); 1497 if (m == NULL) 1498 return (ENOBUFS); 1499 1500 dp = mtod(m, u_char *); 1501 memset(dp, 0, sizeof(struct in_addr)); 1502 dp += sizeof(struct in_addr); 1503 m->m_len = sizeof(struct in_addr); 1504 1505 /* 1506 * IP option list according to RFC791. Each option is of the form 1507 * 1508 * [optval] [olen] [(olen - 2) data bytes] 1509 * 1510 * We validate the list and copy options to an mbuf for prepending 1511 * to data packets. The IP first-hop destination address will be 1512 * stored before actual options and is zero if unset. 1513 */ 1514 while (cnt > 0) { 1515 uint8_t optval, olen, offset; 1516 1517 optval = cp[IPOPT_OPTVAL]; 1518 1519 if (optval == IPOPT_EOL || optval == IPOPT_NOP) { 1520 olen = 1; 1521 } else { 1522 if (cnt < IPOPT_OLEN + 1) 1523 goto bad; 1524 1525 olen = cp[IPOPT_OLEN]; 1526 if (olen < IPOPT_OLEN + 1 || olen > cnt) 1527 goto bad; 1528 } 1529 1530 if (optval == IPOPT_LSRR || optval == IPOPT_SSRR) { 1531 /* 1532 * user process specifies route as: 1533 * ->A->B->C->D 1534 * D must be our final destination (but we can't 1535 * check that since we may not have connected yet). 1536 * A is first hop destination, which doesn't appear in 1537 * actual IP option, but is stored before the options. 1538 */ 1539 if (olen < IPOPT_OFFSET + 1 + sizeof(struct in_addr)) 1540 goto bad; 1541 1542 offset = cp[IPOPT_OFFSET]; 1543 memcpy(mtod(m, u_char *), cp + IPOPT_OFFSET + 1, 1544 sizeof(struct in_addr)); 1545 1546 cp += sizeof(struct in_addr); 1547 cnt -= sizeof(struct in_addr); 1548 olen -= sizeof(struct in_addr); 1549 1550 if (m->m_len + olen > MAX_IPOPTLEN + sizeof(struct in_addr)) 1551 goto bad; 1552 1553 memcpy(dp, cp, olen); 1554 dp[IPOPT_OPTVAL] = optval; 1555 dp[IPOPT_OLEN] = olen; 1556 dp[IPOPT_OFFSET] = offset; 1557 break; 1558 } else { 1559 if (m->m_len + olen > MAX_IPOPTLEN + sizeof(struct in_addr)) 1560 goto bad; 1561 1562 memcpy(dp, cp, olen); 1563 break; 1564 } 1565 1566 dp += olen; 1567 m->m_len += olen; 1568 1569 if (optval == IPOPT_EOL) 1570 break; 1571 1572 cp += olen; 1573 cnt -= olen; 1574 } 1575 1576 inp->inp_options = m; 1577 return 0; 1578 bad: 1579 (void)m_free(m); 1580 return EINVAL; 1581 } 1582 1583 /* 1584 * following RFC1724 section 3.3, 0.0.0.0/8 is interpreted as interface index. 1585 * Must be called in a pserialize critical section. 1586 */ 1587 static struct ifnet * 1588 ip_multicast_if(struct in_addr *a, int *ifindexp) 1589 { 1590 int ifindex; 1591 struct ifnet *ifp = NULL; 1592 struct in_ifaddr *ia; 1593 1594 if (ifindexp) 1595 *ifindexp = 0; 1596 if (ntohl(a->s_addr) >> 24 == 0) { 1597 ifindex = ntohl(a->s_addr) & 0xffffff; 1598 ifp = if_byindex(ifindex); 1599 if (!ifp) 1600 return NULL; 1601 if (ifindexp) 1602 *ifindexp = ifindex; 1603 } else { 1604 IN_ADDRHASH_READER_FOREACH(ia, a->s_addr) { 1605 if (in_hosteq(ia->ia_addr.sin_addr, *a) && 1606 (ia->ia_ifp->if_flags & IFF_MULTICAST) != 0) { 1607 ifp = ia->ia_ifp; 1608 if (if_is_deactivated(ifp)) 1609 ifp = NULL; 1610 break; 1611 } 1612 } 1613 } 1614 return ifp; 1615 } 1616 1617 static int 1618 ip_getoptval(const struct sockopt *sopt, u_int8_t *val, u_int maxval) 1619 { 1620 u_int tval; 1621 u_char cval; 1622 int error; 1623 1624 if (sopt == NULL) 1625 return EINVAL; 1626 1627 switch (sopt->sopt_size) { 1628 case sizeof(u_char): 1629 error = sockopt_get(sopt, &cval, sizeof(u_char)); 1630 tval = cval; 1631 break; 1632 1633 case sizeof(u_int): 1634 error = sockopt_get(sopt, &tval, sizeof(u_int)); 1635 break; 1636 1637 default: 1638 error = EINVAL; 1639 } 1640 1641 if (error) 1642 return error; 1643 1644 if (tval > maxval) 1645 return EINVAL; 1646 1647 *val = tval; 1648 return 0; 1649 } 1650 1651 static int 1652 ip_get_membership(const struct sockopt *sopt, struct ifnet **ifp, 1653 struct psref *psref, struct in_addr *ia, bool add) 1654 { 1655 int error; 1656 struct ip_mreq mreq; 1657 1658 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 1659 if (error) 1660 return error; 1661 1662 if (!IN_MULTICAST(mreq.imr_multiaddr.s_addr)) 1663 return EINVAL; 1664 1665 memcpy(ia, &mreq.imr_multiaddr, sizeof(*ia)); 1666 1667 if (in_nullhost(mreq.imr_interface)) { 1668 union { 1669 struct sockaddr dst; 1670 struct sockaddr_in dst4; 1671 } u; 1672 struct route ro; 1673 1674 if (!add) { 1675 *ifp = NULL; 1676 return 0; 1677 } 1678 /* 1679 * If no interface address was provided, use the interface of 1680 * the route to the given multicast address. 1681 */ 1682 struct rtentry *rt; 1683 memset(&ro, 0, sizeof(ro)); 1684 1685 sockaddr_in_init(&u.dst4, ia, 0); 1686 error = rtcache_setdst(&ro, &u.dst); 1687 if (error != 0) 1688 return error; 1689 *ifp = (rt = rtcache_init(&ro)) != NULL ? rt->rt_ifp : NULL; 1690 if (*ifp != NULL) { 1691 if (if_is_deactivated(*ifp)) 1692 *ifp = NULL; 1693 else 1694 if_acquire(*ifp, psref); 1695 } 1696 rtcache_unref(rt, &ro); 1697 rtcache_free(&ro); 1698 } else { 1699 int s = pserialize_read_enter(); 1700 *ifp = ip_multicast_if(&mreq.imr_interface, NULL); 1701 if (!add && *ifp == NULL) { 1702 pserialize_read_exit(s); 1703 return EADDRNOTAVAIL; 1704 } 1705 if (*ifp != NULL) { 1706 if (if_is_deactivated(*ifp)) 1707 *ifp = NULL; 1708 else 1709 if_acquire(*ifp, psref); 1710 } 1711 pserialize_read_exit(s); 1712 } 1713 return 0; 1714 } 1715 1716 /* 1717 * Add a multicast group membership. 1718 * Group must be a valid IP multicast address. 1719 */ 1720 static int 1721 ip_add_membership(struct ip_moptions *imo, const struct sockopt *sopt) 1722 { 1723 struct ifnet *ifp = NULL; // XXX: gcc [ppc] 1724 struct in_addr ia; 1725 int i, error, bound; 1726 struct psref psref; 1727 1728 /* imo is protected by solock or referenced only by the caller */ 1729 1730 bound = curlwp_bind(); 1731 if (sopt->sopt_size == sizeof(struct ip_mreq)) 1732 error = ip_get_membership(sopt, &ifp, &psref, &ia, true); 1733 else 1734 #ifdef INET6 1735 error = ip6_get_membership(sopt, &ifp, &psref, &ia, sizeof(ia)); 1736 #else 1737 error = EINVAL; 1738 goto out; 1739 #endif 1740 1741 if (error) 1742 goto out; 1743 1744 /* 1745 * See if we found an interface, and confirm that it 1746 * supports multicast. 1747 */ 1748 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1749 error = EADDRNOTAVAIL; 1750 goto out; 1751 } 1752 1753 /* 1754 * See if the membership already exists or if all the 1755 * membership slots are full. 1756 */ 1757 for (i = 0; i < imo->imo_num_memberships; ++i) { 1758 if (imo->imo_membership[i]->inm_ifp == ifp && 1759 in_hosteq(imo->imo_membership[i]->inm_addr, ia)) 1760 break; 1761 } 1762 if (i < imo->imo_num_memberships) { 1763 error = EADDRINUSE; 1764 goto out; 1765 } 1766 1767 if (i == IP_MAX_MEMBERSHIPS) { 1768 error = ETOOMANYREFS; 1769 goto out; 1770 } 1771 1772 /* 1773 * Everything looks good; add a new record to the multicast 1774 * address list for the given interface. 1775 */ 1776 IFNET_LOCK(ifp); 1777 imo->imo_membership[i] = in_addmulti(&ia, ifp); 1778 IFNET_UNLOCK(ifp); 1779 if (imo->imo_membership[i] == NULL) { 1780 error = ENOBUFS; 1781 goto out; 1782 } 1783 1784 ++imo->imo_num_memberships; 1785 error = 0; 1786 out: 1787 if_put(ifp, &psref); 1788 curlwp_bindx(bound); 1789 return error; 1790 } 1791 1792 /* 1793 * Drop a multicast group membership. 1794 * Group must be a valid IP multicast address. 1795 */ 1796 static int 1797 ip_drop_membership(struct ip_moptions *imo, const struct sockopt *sopt) 1798 { 1799 struct in_addr ia = { .s_addr = 0 }; // XXX: gcc [ppc] 1800 struct ifnet *ifp = NULL; // XXX: gcc [ppc] 1801 int i, error, bound; 1802 struct psref psref; 1803 1804 /* imo is protected by solock or referenced only by the caller */ 1805 1806 bound = curlwp_bind(); 1807 if (sopt->sopt_size == sizeof(struct ip_mreq)) 1808 error = ip_get_membership(sopt, &ifp, &psref, &ia, false); 1809 else 1810 #ifdef INET6 1811 error = ip6_get_membership(sopt, &ifp, &psref, &ia, sizeof(ia)); 1812 #else 1813 error = EINVAL; 1814 goto out; 1815 #endif 1816 1817 if (error) 1818 goto out; 1819 1820 /* 1821 * Find the membership in the membership array. 1822 */ 1823 for (i = 0; i < imo->imo_num_memberships; ++i) { 1824 if ((ifp == NULL || 1825 imo->imo_membership[i]->inm_ifp == ifp) && 1826 in_hosteq(imo->imo_membership[i]->inm_addr, ia)) 1827 break; 1828 } 1829 if (i == imo->imo_num_memberships) { 1830 error = EADDRNOTAVAIL; 1831 goto out; 1832 } 1833 1834 /* 1835 * Give up the multicast address record to which the 1836 * membership points. 1837 */ 1838 IFNET_LOCK(ifp); 1839 in_delmulti(imo->imo_membership[i]); 1840 IFNET_UNLOCK(ifp); 1841 1842 /* 1843 * Remove the gap in the membership array. 1844 */ 1845 for (++i; i < imo->imo_num_memberships; ++i) 1846 imo->imo_membership[i-1] = imo->imo_membership[i]; 1847 --imo->imo_num_memberships; 1848 error = 0; 1849 out: 1850 if_put(ifp, &psref); 1851 curlwp_bindx(bound); 1852 return error; 1853 } 1854 1855 /* 1856 * Set the IP multicast options in response to user setsockopt(). 1857 */ 1858 int 1859 ip_setmoptions(struct ip_moptions **pimo, const struct sockopt *sopt) 1860 { 1861 struct ip_moptions *imo = *pimo; 1862 struct in_addr addr; 1863 struct ifnet *ifp; 1864 int ifindex, error = 0; 1865 1866 /* The passed imo isn't NULL, it should be protected by solock */ 1867 1868 if (!imo) { 1869 /* 1870 * No multicast option buffer attached to the pcb; 1871 * allocate one and initialize to default values. 1872 */ 1873 imo = kmem_intr_alloc(sizeof(*imo), KM_NOSLEEP); 1874 if (imo == NULL) 1875 return ENOBUFS; 1876 1877 imo->imo_multicast_if_index = 0; 1878 imo->imo_multicast_addr.s_addr = INADDR_ANY; 1879 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; 1880 imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP; 1881 imo->imo_num_memberships = 0; 1882 *pimo = imo; 1883 } 1884 1885 switch (sopt->sopt_name) { 1886 case IP_MULTICAST_IF: { 1887 int s; 1888 /* 1889 * Select the interface for outgoing multicast packets. 1890 */ 1891 error = sockopt_get(sopt, &addr, sizeof(addr)); 1892 if (error) 1893 break; 1894 1895 /* 1896 * INADDR_ANY is used to remove a previous selection. 1897 * When no interface is selected, a default one is 1898 * chosen every time a multicast packet is sent. 1899 */ 1900 if (in_nullhost(addr)) { 1901 imo->imo_multicast_if_index = 0; 1902 break; 1903 } 1904 /* 1905 * The selected interface is identified by its local 1906 * IP address. Find the interface and confirm that 1907 * it supports multicasting. 1908 */ 1909 s = pserialize_read_enter(); 1910 ifp = ip_multicast_if(&addr, &ifindex); 1911 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1912 pserialize_read_exit(s); 1913 error = EADDRNOTAVAIL; 1914 break; 1915 } 1916 imo->imo_multicast_if_index = ifp->if_index; 1917 pserialize_read_exit(s); 1918 if (ifindex) 1919 imo->imo_multicast_addr = addr; 1920 else 1921 imo->imo_multicast_addr.s_addr = INADDR_ANY; 1922 break; 1923 } 1924 1925 case IP_MULTICAST_TTL: 1926 /* 1927 * Set the IP time-to-live for outgoing multicast packets. 1928 */ 1929 error = ip_getoptval(sopt, &imo->imo_multicast_ttl, MAXTTL); 1930 break; 1931 1932 case IP_MULTICAST_LOOP: 1933 /* 1934 * Set the loopback flag for outgoing multicast packets. 1935 * Must be zero or one. 1936 */ 1937 error = ip_getoptval(sopt, &imo->imo_multicast_loop, 1); 1938 break; 1939 1940 case IP_ADD_MEMBERSHIP: /* IPV6_JOIN_GROUP */ 1941 error = ip_add_membership(imo, sopt); 1942 break; 1943 1944 case IP_DROP_MEMBERSHIP: /* IPV6_LEAVE_GROUP */ 1945 error = ip_drop_membership(imo, sopt); 1946 break; 1947 1948 default: 1949 error = EOPNOTSUPP; 1950 break; 1951 } 1952 1953 /* 1954 * If all options have default values, no need to keep the mbuf. 1955 */ 1956 if (imo->imo_multicast_if_index == 0 && 1957 imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && 1958 imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && 1959 imo->imo_num_memberships == 0) { 1960 kmem_intr_free(imo, sizeof(*imo)); 1961 *pimo = NULL; 1962 } 1963 1964 return error; 1965 } 1966 1967 /* 1968 * Return the IP multicast options in response to user getsockopt(). 1969 */ 1970 int 1971 ip_getmoptions(struct ip_moptions *imo, struct sockopt *sopt) 1972 { 1973 struct in_addr addr; 1974 uint8_t optval; 1975 int error = 0; 1976 1977 /* imo is protected by solock or refereced only by the caller */ 1978 1979 switch (sopt->sopt_name) { 1980 case IP_MULTICAST_IF: 1981 if (imo == NULL || imo->imo_multicast_if_index == 0) 1982 addr = zeroin_addr; 1983 else if (imo->imo_multicast_addr.s_addr) { 1984 /* return the value user has set */ 1985 addr = imo->imo_multicast_addr; 1986 } else { 1987 struct ifnet *ifp; 1988 struct in_ifaddr *ia = NULL; 1989 int s = pserialize_read_enter(); 1990 1991 ifp = if_byindex(imo->imo_multicast_if_index); 1992 if (ifp != NULL) { 1993 ia = in_get_ia_from_ifp(ifp); 1994 } 1995 addr = ia ? ia->ia_addr.sin_addr : zeroin_addr; 1996 pserialize_read_exit(s); 1997 } 1998 error = sockopt_set(sopt, &addr, sizeof(addr)); 1999 break; 2000 2001 case IP_MULTICAST_TTL: 2002 optval = imo ? imo->imo_multicast_ttl 2003 : IP_DEFAULT_MULTICAST_TTL; 2004 2005 error = sockopt_set(sopt, &optval, sizeof(optval)); 2006 break; 2007 2008 case IP_MULTICAST_LOOP: 2009 optval = imo ? imo->imo_multicast_loop 2010 : IP_DEFAULT_MULTICAST_LOOP; 2011 2012 error = sockopt_set(sopt, &optval, sizeof(optval)); 2013 break; 2014 2015 default: 2016 error = EOPNOTSUPP; 2017 } 2018 2019 return error; 2020 } 2021 2022 /* 2023 * Discard the IP multicast options. 2024 */ 2025 void 2026 ip_freemoptions(struct ip_moptions *imo) 2027 { 2028 int i; 2029 2030 /* The owner of imo (inp) should be protected by solock */ 2031 2032 if (imo != NULL) { 2033 for (i = 0; i < imo->imo_num_memberships; ++i) { 2034 struct in_multi *inm = imo->imo_membership[i]; 2035 struct ifnet *ifp = inm->inm_ifp; 2036 IFNET_LOCK(ifp); 2037 in_delmulti(inm); 2038 /* ifp should not leave thanks to solock */ 2039 IFNET_UNLOCK(ifp); 2040 } 2041 2042 kmem_intr_free(imo, sizeof(*imo)); 2043 } 2044 } 2045 2046 /* 2047 * Routine called from ip_output() to loop back a copy of an IP multicast 2048 * packet to the input queue of a specified interface. Note that this 2049 * calls the output routine of the loopback "driver", but with an interface 2050 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 2051 */ 2052 static void 2053 ip_mloopback(struct ifnet *ifp, struct mbuf *m, const struct sockaddr_in *dst) 2054 { 2055 struct ip *ip; 2056 struct mbuf *copym; 2057 2058 copym = m_copypacket(m, M_DONTWAIT); 2059 if (copym != NULL && 2060 (copym->m_flags & M_EXT || copym->m_len < sizeof(struct ip))) 2061 copym = m_pullup(copym, sizeof(struct ip)); 2062 if (copym == NULL) 2063 return; 2064 /* 2065 * We don't bother to fragment if the IP length is greater 2066 * than the interface's MTU. Can this possibly matter? 2067 */ 2068 ip = mtod(copym, struct ip *); 2069 2070 if (copym->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 2071 in_delayed_cksum(copym); 2072 copym->m_pkthdr.csum_flags &= 2073 ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 2074 } 2075 2076 ip->ip_sum = 0; 2077 ip->ip_sum = in_cksum(copym, ip->ip_hl << 2); 2078 KERNEL_LOCK_UNLESS_NET_MPSAFE(); 2079 (void)looutput(ifp, copym, sintocsa(dst), NULL); 2080 KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 2081 } 2082 2083 /* 2084 * Ensure sending address is valid. 2085 * Returns 0 on success, -1 if an error should be sent back or 1 2086 * if the packet could be dropped without error (protocol dependent). 2087 */ 2088 static int 2089 ip_ifaddrvalid(const struct in_ifaddr *ia) 2090 { 2091 2092 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY) 2093 return 0; 2094 2095 if (ia->ia4_flags & IN_IFF_DUPLICATED) 2096 return -1; 2097 else if (ia->ia4_flags & (IN_IFF_TENTATIVE | IN_IFF_DETACHED)) 2098 return 1; 2099 2100 return 0; 2101 } 2102
Indexes created Mon Sep 22 21:09:42 GMT 2025