ip_output.c revision 243624
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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: head/sys/netinet/ip_output.c 243624 2012-11-27 19:31:49Z andre $"); 34 35#include "opt_ipfw.h" 36#include "opt_ipsec.h" 37#include "opt_route.h" 38#include "opt_mbuf_stress_test.h" 39#include "opt_mpath.h" 40#include "opt_sctp.h" 41 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/kernel.h> 45#include <sys/malloc.h> 46#include <sys/mbuf.h> 47#include <sys/priv.h> 48#include <sys/proc.h> 49#include <sys/protosw.h> 50#include <sys/socket.h> 51#include <sys/socketvar.h> 52#include <sys/sysctl.h> 53#include <sys/ucred.h> 54 55#include <net/if.h> 56#include <net/if_llatbl.h> 57#include <net/netisr.h> 58#include <net/pfil.h> 59#include <net/route.h> 60#include <net/flowtable.h> 61#ifdef RADIX_MPATH 62#include <net/radix_mpath.h> 63#endif 64#include <net/vnet.h> 65 66#include <netinet/in.h> 67#include <netinet/in_systm.h> 68#include <netinet/ip.h> 69#include <netinet/in_pcb.h> 70#include <netinet/in_var.h> 71#include <netinet/ip_var.h> 72#include <netinet/ip_options.h> 73#ifdef SCTP 74#include <netinet/sctp.h> 75#include <netinet/sctp_crc32.h> 76#endif 77 78#ifdef IPSEC 79#include <netinet/ip_ipsec.h> 80#include <netipsec/ipsec.h> 81#endif /* IPSEC*/ 82 83#include <machine/in_cksum.h> 84 85#include <security/mac/mac_framework.h> 86 87VNET_DEFINE(u_short, ip_id); 88 89#ifdef MBUF_STRESS_TEST 90static int mbuf_frag_size = 0; 91SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW, 92 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size"); 93#endif 94 95static void ip_mloopback 96 (struct ifnet *, struct mbuf *, struct sockaddr_in *, int); 97 98 99extern int in_mcast_loop; 100extern struct protosw inetsw[]; 101 102/* 103 * IP output. The packet in mbuf chain m contains a skeletal IP 104 * header (with len, off, ttl, proto, tos, src, dst). 105 * The mbuf chain containing the packet will be freed. 106 * The mbuf opt, if present, will not be freed. 107 * If route ro is present and has ro_rt initialized, route lookup would be 108 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 109 * then result of route lookup is stored in ro->ro_rt. 110 * 111 * In the IP forwarding case, the packet will arrive with options already 112 * inserted, so must have a NULL opt pointer. 113 */ 114int 115ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags, 116 struct ip_moptions *imo, struct inpcb *inp) 117{ 118 struct ip *ip; 119 struct ifnet *ifp = NULL; /* keep compiler happy */ 120 struct mbuf *m0; 121 int hlen = sizeof (struct ip); 122 int mtu; 123 int n; /* scratchpad */ 124 int error = 0; 125 struct sockaddr_in *dst; 126 struct in_ifaddr *ia; 127 int isbroadcast; 128 uint16_t ip_len, ip_off; 129 struct route iproute; 130 struct rtentry *rte; /* cache for ro->ro_rt */ 131 struct in_addr odst; 132 struct m_tag *fwd_tag = NULL; 133#ifdef IPSEC 134 int no_route_but_check_spd = 0; 135#endif 136 M_ASSERTPKTHDR(m); 137 138 if (inp != NULL) { 139 INP_LOCK_ASSERT(inp); 140 M_SETFIB(m, inp->inp_inc.inc_fibnum); 141 if (inp->inp_flags & (INP_HW_FLOWID|INP_SW_FLOWID)) { 142 m->m_pkthdr.flowid = inp->inp_flowid; 143 m->m_flags |= M_FLOWID; 144 } 145 } 146 147 if (ro == NULL) { 148 ro = &iproute; 149 bzero(ro, sizeof (*ro)); 150 } 151 152#ifdef FLOWTABLE 153 if (ro->ro_rt == NULL) { 154 struct flentry *fle; 155 156 /* 157 * The flow table returns route entries valid for up to 30 158 * seconds; we rely on the remainder of ip_output() taking no 159 * longer than that long for the stability of ro_rt. The 160 * flow ID assignment must have happened before this point. 161 */ 162 fle = flowtable_lookup_mbuf(V_ip_ft, m, AF_INET); 163 if (fle != NULL) 164 flow_to_route(fle, ro); 165 } 166#endif 167 168 if (opt) { 169 int len = 0; 170 m = ip_insertoptions(m, opt, &len); 171 if (len != 0) 172 hlen = len; /* ip->ip_hl is updated above */ 173 } 174 ip = mtod(m, struct ip *); 175 ip_len = ntohs(ip->ip_len); 176 ip_off = ntohs(ip->ip_off); 177 178 /* 179 * Fill in IP header. If we are not allowing fragmentation, 180 * then the ip_id field is meaningless, but we don't set it 181 * to zero. Doing so causes various problems when devices along 182 * the path (routers, load balancers, firewalls, etc.) illegally 183 * disable DF on our packet. Note that a 16-bit counter 184 * will wrap around in less than 10 seconds at 100 Mbit/s on a 185 * medium with MTU 1500. See Steven M. Bellovin, "A Technique 186 * for Counting NATted Hosts", Proc. IMW'02, available at 187 * <http://www.cs.columbia.edu/~smb/papers/fnat.pdf>. 188 */ 189 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 190 ip->ip_v = IPVERSION; 191 ip->ip_hl = hlen >> 2; 192 ip->ip_id = ip_newid(); 193 IPSTAT_INC(ips_localout); 194 } else { 195 /* Header already set, fetch hlen from there */ 196 hlen = ip->ip_hl << 2; 197 } 198 199 dst = (struct sockaddr_in *)&ro->ro_dst; 200again: 201 ia = NULL; 202 /* 203 * If there is a cached route, 204 * check that it is to the same destination 205 * and is still up. If not, free it and try again. 206 * The address family should also be checked in case of sharing the 207 * cache with IPv6. 208 */ 209 rte = ro->ro_rt; 210 if (rte && ((rte->rt_flags & RTF_UP) == 0 || 211 rte->rt_ifp == NULL || 212 !RT_LINK_IS_UP(rte->rt_ifp) || 213 dst->sin_family != AF_INET || 214 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) { 215 RO_RTFREE(ro); 216 ro->ro_lle = NULL; 217 rte = NULL; 218 } 219 if (rte == NULL && fwd_tag == NULL) { 220 bzero(dst, sizeof(*dst)); 221 dst->sin_family = AF_INET; 222 dst->sin_len = sizeof(*dst); 223 dst->sin_addr = ip->ip_dst; 224 } 225 /* 226 * If routing to interface only, short circuit routing lookup. 227 * The use of an all-ones broadcast address implies this; an 228 * interface is specified by the broadcast address of an interface, 229 * or the destination address of a ptp interface. 230 */ 231 if (flags & IP_SENDONES) { 232 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst)))) == NULL && 233 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == NULL) { 234 IPSTAT_INC(ips_noroute); 235 error = ENETUNREACH; 236 goto bad; 237 } 238 ip->ip_dst.s_addr = INADDR_BROADCAST; 239 dst->sin_addr = ip->ip_dst; 240 ifp = ia->ia_ifp; 241 ip->ip_ttl = 1; 242 isbroadcast = 1; 243 } else if (flags & IP_ROUTETOIF) { 244 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == NULL && 245 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0))) == NULL) { 246 IPSTAT_INC(ips_noroute); 247 error = ENETUNREACH; 248 goto bad; 249 } 250 ifp = ia->ia_ifp; 251 ip->ip_ttl = 1; 252 isbroadcast = in_broadcast(dst->sin_addr, ifp); 253 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 254 imo != NULL && imo->imo_multicast_ifp != NULL) { 255 /* 256 * Bypass the normal routing lookup for multicast 257 * packets if the interface is specified. 258 */ 259 ifp = imo->imo_multicast_ifp; 260 IFP_TO_IA(ifp, ia); 261 isbroadcast = 0; /* fool gcc */ 262 } else { 263 /* 264 * We want to do any cloning requested by the link layer, 265 * as this is probably required in all cases for correct 266 * operation (as it is for ARP). 267 */ 268 if (rte == NULL) { 269#ifdef RADIX_MPATH 270 rtalloc_mpath_fib(ro, 271 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), 272 inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m)); 273#else 274 in_rtalloc_ign(ro, 0, 275 inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m)); 276#endif 277 rte = ro->ro_rt; 278 } 279 if (rte == NULL || 280 rte->rt_ifp == NULL || 281 !RT_LINK_IS_UP(rte->rt_ifp)) { 282#ifdef IPSEC 283 /* 284 * There is no route for this packet, but it is 285 * possible that a matching SPD entry exists. 286 */ 287 no_route_but_check_spd = 1; 288 mtu = 0; /* Silence GCC warning. */ 289 goto sendit; 290#endif 291 IPSTAT_INC(ips_noroute); 292 error = EHOSTUNREACH; 293 goto bad; 294 } 295 ia = ifatoia(rte->rt_ifa); 296 ifa_ref(&ia->ia_ifa); 297 ifp = rte->rt_ifp; 298 rte->rt_rmx.rmx_pksent++; 299 if (rte->rt_flags & RTF_GATEWAY) 300 dst = (struct sockaddr_in *)rte->rt_gateway; 301 if (rte->rt_flags & RTF_HOST) 302 isbroadcast = (rte->rt_flags & RTF_BROADCAST); 303 else 304 isbroadcast = in_broadcast(dst->sin_addr, ifp); 305 } 306 /* 307 * Calculate MTU. If we have a route that is up, use that, 308 * otherwise use the interface's MTU. 309 */ 310 if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST))) { 311 /* 312 * This case can happen if the user changed the MTU 313 * of an interface after enabling IP on it. Because 314 * most netifs don't keep track of routes pointing to 315 * them, there is no way for one to update all its 316 * routes when the MTU is changed. 317 */ 318 if (rte->rt_rmx.rmx_mtu > ifp->if_mtu) 319 rte->rt_rmx.rmx_mtu = ifp->if_mtu; 320 mtu = rte->rt_rmx.rmx_mtu; 321 } else { 322 mtu = ifp->if_mtu; 323 } 324 /* Catch a possible divide by zero later. */ 325 KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p", 326 __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp)); 327 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 328 m->m_flags |= M_MCAST; 329 /* 330 * IP destination address is multicast. Make sure "dst" 331 * still points to the address in "ro". (It may have been 332 * changed to point to a gateway address, above.) 333 */ 334 dst = (struct sockaddr_in *)&ro->ro_dst; 335 /* 336 * See if the caller provided any multicast options 337 */ 338 if (imo != NULL) { 339 ip->ip_ttl = imo->imo_multicast_ttl; 340 if (imo->imo_multicast_vif != -1) 341 ip->ip_src.s_addr = 342 ip_mcast_src ? 343 ip_mcast_src(imo->imo_multicast_vif) : 344 INADDR_ANY; 345 } else 346 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 347 /* 348 * Confirm that the outgoing interface supports multicast. 349 */ 350 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 351 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 352 IPSTAT_INC(ips_noroute); 353 error = ENETUNREACH; 354 goto bad; 355 } 356 } 357 /* 358 * If source address not specified yet, use address 359 * of outgoing interface. 360 */ 361 if (ip->ip_src.s_addr == INADDR_ANY) { 362 /* Interface may have no addresses. */ 363 if (ia != NULL) 364 ip->ip_src = IA_SIN(ia)->sin_addr; 365 } 366 367 if ((imo == NULL && in_mcast_loop) || 368 (imo && imo->imo_multicast_loop)) { 369 /* 370 * Loop back multicast datagram if not expressly 371 * forbidden to do so, even if we are not a member 372 * of the group; ip_input() will filter it later, 373 * thus deferring a hash lookup and mutex acquisition 374 * at the expense of a cheap copy using m_copym(). 375 */ 376 ip_mloopback(ifp, m, dst, hlen); 377 } else { 378 /* 379 * If we are acting as a multicast router, perform 380 * multicast forwarding as if the packet had just 381 * arrived on the interface to which we are about 382 * to send. The multicast forwarding function 383 * recursively calls this function, using the 384 * IP_FORWARDING flag to prevent infinite recursion. 385 * 386 * Multicasts that are looped back by ip_mloopback(), 387 * above, will be forwarded by the ip_input() routine, 388 * if necessary. 389 */ 390 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) { 391 /* 392 * If rsvp daemon is not running, do not 393 * set ip_moptions. This ensures that the packet 394 * is multicast and not just sent down one link 395 * as prescribed by rsvpd. 396 */ 397 if (!V_rsvp_on) 398 imo = NULL; 399 if (ip_mforward && 400 ip_mforward(ip, ifp, m, imo) != 0) { 401 m_freem(m); 402 goto done; 403 } 404 } 405 } 406 407 /* 408 * Multicasts with a time-to-live of zero may be looped- 409 * back, above, but must not be transmitted on a network. 410 * Also, multicasts addressed to the loopback interface 411 * are not sent -- the above call to ip_mloopback() will 412 * loop back a copy. ip_input() will drop the copy if 413 * this host does not belong to the destination group on 414 * the loopback interface. 415 */ 416 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 417 m_freem(m); 418 goto done; 419 } 420 421 goto sendit; 422 } 423 424 /* 425 * If the source address is not specified yet, use the address 426 * of the outoing interface. 427 */ 428 if (ip->ip_src.s_addr == INADDR_ANY) { 429 /* Interface may have no addresses. */ 430 if (ia != NULL) { 431 ip->ip_src = IA_SIN(ia)->sin_addr; 432 } 433 } 434 435 /* 436 * Verify that we have any chance at all of being able to queue the 437 * packet or packet fragments, unless ALTQ is enabled on the given 438 * interface in which case packetdrop should be done by queueing. 439 */ 440 n = ip_len / mtu + 1; /* how many fragments ? */ 441 if ( 442#ifdef ALTQ 443 (!ALTQ_IS_ENABLED(&ifp->if_snd)) && 444#endif /* ALTQ */ 445 (ifp->if_snd.ifq_len + n) >= ifp->if_snd.ifq_maxlen ) { 446 error = ENOBUFS; 447 IPSTAT_INC(ips_odropped); 448 ifp->if_snd.ifq_drops += n; 449 goto bad; 450 } 451 452 /* 453 * Look for broadcast address and 454 * verify user is allowed to send 455 * such a packet. 456 */ 457 if (isbroadcast) { 458 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 459 error = EADDRNOTAVAIL; 460 goto bad; 461 } 462 if ((flags & IP_ALLOWBROADCAST) == 0) { 463 error = EACCES; 464 goto bad; 465 } 466 /* don't allow broadcast messages to be fragmented */ 467 if (ip_len > mtu) { 468 error = EMSGSIZE; 469 goto bad; 470 } 471 m->m_flags |= M_BCAST; 472 } else { 473 m->m_flags &= ~M_BCAST; 474 } 475 476sendit: 477#ifdef IPSEC 478 switch(ip_ipsec_output(&m, inp, &flags, &error)) { 479 case 1: 480 goto bad; 481 case -1: 482 goto done; 483 case 0: 484 default: 485 break; /* Continue with packet processing. */ 486 } 487 /* 488 * Check if there was a route for this packet; return error if not. 489 */ 490 if (no_route_but_check_spd) { 491 IPSTAT_INC(ips_noroute); 492 error = EHOSTUNREACH; 493 goto bad; 494 } 495 /* Update variables that are affected by ipsec4_output(). */ 496 ip = mtod(m, struct ip *); 497 hlen = ip->ip_hl << 2; 498#endif /* IPSEC */ 499 500 /* Jump over all PFIL processing if hooks are not active. */ 501 if (!PFIL_HOOKED(&V_inet_pfil_hook)) 502 goto passout; 503 504 /* Run through list of hooks for output packets. */ 505 odst.s_addr = ip->ip_dst.s_addr; 506 error = pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_OUT, inp); 507 if (error != 0 || m == NULL) 508 goto done; 509 510 ip = mtod(m, struct ip *); 511 512 /* See if destination IP address was changed by packet filter. */ 513 if (odst.s_addr != ip->ip_dst.s_addr) { 514 m->m_flags |= M_SKIP_FIREWALL; 515 /* If destination is now ourself drop to ip_input(). */ 516 if (in_localip(ip->ip_dst)) { 517 m->m_flags |= M_FASTFWD_OURS; 518 if (m->m_pkthdr.rcvif == NULL) 519 m->m_pkthdr.rcvif = V_loif; 520 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 521 m->m_pkthdr.csum_flags |= 522 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 523 m->m_pkthdr.csum_data = 0xffff; 524 } 525 m->m_pkthdr.csum_flags |= 526 CSUM_IP_CHECKED | CSUM_IP_VALID; 527#ifdef SCTP 528 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 529 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 530#endif 531 error = netisr_queue(NETISR_IP, m); 532 goto done; 533 } else { 534 if (ia != NULL) 535 ifa_free(&ia->ia_ifa); 536 goto again; /* Redo the routing table lookup. */ 537 } 538 } 539 540 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 541 if (m->m_flags & M_FASTFWD_OURS) { 542 if (m->m_pkthdr.rcvif == NULL) 543 m->m_pkthdr.rcvif = V_loif; 544 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 545 m->m_pkthdr.csum_flags |= 546 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 547 m->m_pkthdr.csum_data = 0xffff; 548 } 549#ifdef SCTP 550 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 551 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 552#endif 553 m->m_pkthdr.csum_flags |= 554 CSUM_IP_CHECKED | CSUM_IP_VALID; 555 556 error = netisr_queue(NETISR_IP, m); 557 goto done; 558 } 559 /* Or forward to some other address? */ 560 if ((m->m_flags & M_IP_NEXTHOP) && 561 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 562 dst = (struct sockaddr_in *)&ro->ro_dst; 563 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 564 m->m_flags |= M_SKIP_FIREWALL; 565 m->m_flags &= ~M_IP_NEXTHOP; 566 m_tag_delete(m, fwd_tag); 567 if (ia != NULL) 568 ifa_free(&ia->ia_ifa); 569 goto again; 570 } 571 572passout: 573 /* 127/8 must not appear on wire - RFC1122. */ 574 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 575 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 576 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 577 IPSTAT_INC(ips_badaddr); 578 error = EADDRNOTAVAIL; 579 goto bad; 580 } 581 } 582 583 m->m_pkthdr.csum_flags |= CSUM_IP; 584 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 585 in_delayed_cksum(m); 586 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 587 } 588#ifdef SCTP 589 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 590 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 591 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 592 } 593#endif 594 595 /* 596 * If small enough for interface, or the interface will take 597 * care of the fragmentation for us, we can just send directly. 598 */ 599 if (ip_len <= mtu || 600 (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0 || 601 ((ip_off & IP_DF) == 0 && (ifp->if_hwassist & CSUM_FRAGMENT))) { 602 ip->ip_sum = 0; 603 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 604 ip->ip_sum = in_cksum(m, hlen); 605 m->m_pkthdr.csum_flags &= ~CSUM_IP; 606 } 607 608 /* 609 * Record statistics for this interface address. 610 * With CSUM_TSO the byte/packet count will be slightly 611 * incorrect because we count the IP+TCP headers only 612 * once instead of for every generated packet. 613 */ 614 if (!(flags & IP_FORWARDING) && ia) { 615 if (m->m_pkthdr.csum_flags & CSUM_TSO) 616 ia->ia_ifa.if_opackets += 617 m->m_pkthdr.len / m->m_pkthdr.tso_segsz; 618 else 619 ia->ia_ifa.if_opackets++; 620 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 621 } 622#ifdef MBUF_STRESS_TEST 623 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 624 m = m_fragment(m, M_DONTWAIT, mbuf_frag_size); 625#endif 626 /* 627 * Reset layer specific mbuf flags 628 * to avoid confusing lower layers. 629 */ 630 m->m_flags &= ~(M_PROTOFLAGS); 631 error = (*ifp->if_output)(ifp, m, 632 (struct sockaddr *)dst, ro); 633 goto done; 634 } 635 636 /* Balk when DF bit is set or the interface didn't support TSO. */ 637 if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) { 638 error = EMSGSIZE; 639 IPSTAT_INC(ips_cantfrag); 640 goto bad; 641 } 642 643 /* 644 * Too large for interface; fragment if possible. If successful, 645 * on return, m will point to a list of packets to be sent. 646 */ 647 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist); 648 if (error) 649 goto bad; 650 for (; m; m = m0) { 651 m0 = m->m_nextpkt; 652 m->m_nextpkt = 0; 653 if (error == 0) { 654 /* Record statistics for this interface address. */ 655 if (ia != NULL) { 656 ia->ia_ifa.if_opackets++; 657 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 658 } 659 /* 660 * Reset layer specific mbuf flags 661 * to avoid confusing upper layers. 662 */ 663 m->m_flags &= ~(M_PROTOFLAGS); 664 665 error = (*ifp->if_output)(ifp, m, 666 (struct sockaddr *)dst, ro); 667 } else 668 m_freem(m); 669 } 670 671 if (error == 0) 672 IPSTAT_INC(ips_fragmented); 673 674done: 675 if (ro == &iproute) 676 RO_RTFREE(ro); 677 if (ia != NULL) 678 ifa_free(&ia->ia_ifa); 679 return (error); 680bad: 681 m_freem(m); 682 goto done; 683} 684 685/* 686 * Create a chain of fragments which fit the given mtu. m_frag points to the 687 * mbuf to be fragmented; on return it points to the chain with the fragments. 688 * Return 0 if no error. If error, m_frag may contain a partially built 689 * chain of fragments that should be freed by the caller. 690 * 691 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist) 692 */ 693int 694ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 695 u_long if_hwassist_flags) 696{ 697 int error = 0; 698 int hlen = ip->ip_hl << 2; 699 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */ 700 int off; 701 struct mbuf *m0 = *m_frag; /* the original packet */ 702 int firstlen; 703 struct mbuf **mnext; 704 int nfrags; 705 uint16_t ip_len, ip_off; 706 707 ip_len = ntohs(ip->ip_len); 708 ip_off = ntohs(ip->ip_off); 709 710 if (ip_off & IP_DF) { /* Fragmentation not allowed */ 711 IPSTAT_INC(ips_cantfrag); 712 return EMSGSIZE; 713 } 714 715 /* 716 * Must be able to put at least 8 bytes per fragment. 717 */ 718 if (len < 8) 719 return EMSGSIZE; 720 721 /* 722 * If the interface will not calculate checksums on 723 * fragmented packets, then do it here. 724 */ 725 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 726 in_delayed_cksum(m0); 727 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 728 } 729#ifdef SCTP 730 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) { 731 sctp_delayed_cksum(m0, hlen); 732 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 733 } 734#endif 735 if (len > PAGE_SIZE) { 736 /* 737 * Fragment large datagrams such that each segment 738 * contains a multiple of PAGE_SIZE amount of data, 739 * plus headers. This enables a receiver to perform 740 * page-flipping zero-copy optimizations. 741 * 742 * XXX When does this help given that sender and receiver 743 * could have different page sizes, and also mtu could 744 * be less than the receiver's page size ? 745 */ 746 int newlen; 747 struct mbuf *m; 748 749 for (m = m0, off = 0; m && (off+m->m_len) <= mtu; m = m->m_next) 750 off += m->m_len; 751 752 /* 753 * firstlen (off - hlen) must be aligned on an 754 * 8-byte boundary 755 */ 756 if (off < hlen) 757 goto smart_frag_failure; 758 off = ((off - hlen) & ~7) + hlen; 759 newlen = (~PAGE_MASK) & mtu; 760 if ((newlen + sizeof (struct ip)) > mtu) { 761 /* we failed, go back the default */ 762smart_frag_failure: 763 newlen = len; 764 off = hlen + len; 765 } 766 len = newlen; 767 768 } else { 769 off = hlen + len; 770 } 771 772 firstlen = off - hlen; 773 mnext = &m0->m_nextpkt; /* pointer to next packet */ 774 775 /* 776 * Loop through length of segment after first fragment, 777 * make new header and copy data of each part and link onto chain. 778 * Here, m0 is the original packet, m is the fragment being created. 779 * The fragments are linked off the m_nextpkt of the original 780 * packet, which after processing serves as the first fragment. 781 */ 782 for (nfrags = 1; off < ip_len; off += len, nfrags++) { 783 struct ip *mhip; /* ip header on the fragment */ 784 struct mbuf *m; 785 int mhlen = sizeof (struct ip); 786 787 MGETHDR(m, M_DONTWAIT, MT_DATA); 788 if (m == NULL) { 789 error = ENOBUFS; 790 IPSTAT_INC(ips_odropped); 791 goto done; 792 } 793 m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG; 794 /* 795 * In the first mbuf, leave room for the link header, then 796 * copy the original IP header including options. The payload 797 * goes into an additional mbuf chain returned by m_copym(). 798 */ 799 m->m_data += max_linkhdr; 800 mhip = mtod(m, struct ip *); 801 *mhip = *ip; 802 if (hlen > sizeof (struct ip)) { 803 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 804 mhip->ip_v = IPVERSION; 805 mhip->ip_hl = mhlen >> 2; 806 } 807 m->m_len = mhlen; 808 /* XXX do we need to add ip_off below ? */ 809 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 810 if (off + len >= ip_len) { /* last fragment */ 811 len = ip_len - off; 812 m->m_flags |= M_LASTFRAG; 813 } else 814 mhip->ip_off |= IP_MF; 815 mhip->ip_len = htons((u_short)(len + mhlen)); 816 m->m_next = m_copym(m0, off, len, M_DONTWAIT); 817 if (m->m_next == NULL) { /* copy failed */ 818 m_free(m); 819 error = ENOBUFS; /* ??? */ 820 IPSTAT_INC(ips_odropped); 821 goto done; 822 } 823 m->m_pkthdr.len = mhlen + len; 824 m->m_pkthdr.rcvif = NULL; 825#ifdef MAC 826 mac_netinet_fragment(m0, m); 827#endif 828 m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags; 829 mhip->ip_off = htons(mhip->ip_off); 830 mhip->ip_sum = 0; 831 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 832 mhip->ip_sum = in_cksum(m, mhlen); 833 m->m_pkthdr.csum_flags &= ~CSUM_IP; 834 } 835 *mnext = m; 836 mnext = &m->m_nextpkt; 837 } 838 IPSTAT_ADD(ips_ofragments, nfrags); 839 840 /* set first marker for fragment chain */ 841 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 842 m0->m_pkthdr.csum_data = nfrags; 843 844 /* 845 * Update first fragment by trimming what's been copied out 846 * and updating header. 847 */ 848 m_adj(m0, hlen + firstlen - ip_len); 849 m0->m_pkthdr.len = hlen + firstlen; 850 ip->ip_len = htons((u_short)m0->m_pkthdr.len); 851 ip->ip_off = htons(ip_off | IP_MF); 852 ip->ip_sum = 0; 853 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 854 ip->ip_sum = in_cksum(m0, hlen); 855 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 856 } 857 858done: 859 *m_frag = m0; 860 return error; 861} 862 863void 864in_delayed_cksum(struct mbuf *m) 865{ 866 struct ip *ip; 867 uint16_t csum, offset, ip_len; 868 869 ip = mtod(m, struct ip *); 870 offset = ip->ip_hl << 2 ; 871 ip_len = ntohs(ip->ip_len); 872 csum = in_cksum_skip(m, ip_len, offset); 873 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0) 874 csum = 0xffff; 875 offset += m->m_pkthdr.csum_data; /* checksum offset */ 876 877 if (offset + sizeof(u_short) > m->m_len) { 878 printf("delayed m_pullup, m->len: %d off: %d p: %d\n", 879 m->m_len, offset, ip->ip_p); 880 /* 881 * XXX 882 * this shouldn't happen, but if it does, the 883 * correct behavior may be to insert the checksum 884 * in the appropriate next mbuf in the chain. 885 */ 886 return; 887 } 888 *(u_short *)(m->m_data + offset) = csum; 889} 890 891/* 892 * IP socket option processing. 893 */ 894int 895ip_ctloutput(struct socket *so, struct sockopt *sopt) 896{ 897 struct inpcb *inp = sotoinpcb(so); 898 int error, optval; 899 900 error = optval = 0; 901 if (sopt->sopt_level != IPPROTO_IP) { 902 error = EINVAL; 903 904 if (sopt->sopt_level == SOL_SOCKET && 905 sopt->sopt_dir == SOPT_SET) { 906 switch (sopt->sopt_name) { 907 case SO_REUSEADDR: 908 INP_WLOCK(inp); 909 if (IN_MULTICAST(ntohl(inp->inp_laddr.s_addr))) { 910 if ((so->so_options & 911 (SO_REUSEADDR | SO_REUSEPORT)) != 0) 912 inp->inp_flags2 |= INP_REUSEPORT; 913 else 914 inp->inp_flags2 &= ~INP_REUSEPORT; 915 } 916 INP_WUNLOCK(inp); 917 error = 0; 918 break; 919 case SO_REUSEPORT: 920 INP_WLOCK(inp); 921 if ((so->so_options & SO_REUSEPORT) != 0) 922 inp->inp_flags2 |= INP_REUSEPORT; 923 else 924 inp->inp_flags2 &= ~INP_REUSEPORT; 925 INP_WUNLOCK(inp); 926 error = 0; 927 break; 928 case SO_SETFIB: 929 INP_WLOCK(inp); 930 inp->inp_inc.inc_fibnum = so->so_fibnum; 931 INP_WUNLOCK(inp); 932 error = 0; 933 break; 934 default: 935 break; 936 } 937 } 938 return (error); 939 } 940 941 switch (sopt->sopt_dir) { 942 case SOPT_SET: 943 switch (sopt->sopt_name) { 944 case IP_OPTIONS: 945#ifdef notyet 946 case IP_RETOPTS: 947#endif 948 { 949 struct mbuf *m; 950 if (sopt->sopt_valsize > MLEN) { 951 error = EMSGSIZE; 952 break; 953 } 954 MGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT, MT_DATA); 955 if (m == NULL) { 956 error = ENOBUFS; 957 break; 958 } 959 m->m_len = sopt->sopt_valsize; 960 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 961 m->m_len); 962 if (error) { 963 m_free(m); 964 break; 965 } 966 INP_WLOCK(inp); 967 error = ip_pcbopts(inp, sopt->sopt_name, m); 968 INP_WUNLOCK(inp); 969 return (error); 970 } 971 972 case IP_BINDANY: 973 if (sopt->sopt_td != NULL) { 974 error = priv_check(sopt->sopt_td, 975 PRIV_NETINET_BINDANY); 976 if (error) 977 break; 978 } 979 /* FALLTHROUGH */ 980 case IP_TOS: 981 case IP_TTL: 982 case IP_MINTTL: 983 case IP_RECVOPTS: 984 case IP_RECVRETOPTS: 985 case IP_RECVDSTADDR: 986 case IP_RECVTTL: 987 case IP_RECVIF: 988 case IP_FAITH: 989 case IP_ONESBCAST: 990 case IP_DONTFRAG: 991 case IP_RECVTOS: 992 error = sooptcopyin(sopt, &optval, sizeof optval, 993 sizeof optval); 994 if (error) 995 break; 996 997 switch (sopt->sopt_name) { 998 case IP_TOS: 999 inp->inp_ip_tos = optval; 1000 break; 1001 1002 case IP_TTL: 1003 inp->inp_ip_ttl = optval; 1004 break; 1005 1006 case IP_MINTTL: 1007 if (optval >= 0 && optval <= MAXTTL) 1008 inp->inp_ip_minttl = optval; 1009 else 1010 error = EINVAL; 1011 break; 1012 1013#define OPTSET(bit) do { \ 1014 INP_WLOCK(inp); \ 1015 if (optval) \ 1016 inp->inp_flags |= bit; \ 1017 else \ 1018 inp->inp_flags &= ~bit; \ 1019 INP_WUNLOCK(inp); \ 1020} while (0) 1021 1022 case IP_RECVOPTS: 1023 OPTSET(INP_RECVOPTS); 1024 break; 1025 1026 case IP_RECVRETOPTS: 1027 OPTSET(INP_RECVRETOPTS); 1028 break; 1029 1030 case IP_RECVDSTADDR: 1031 OPTSET(INP_RECVDSTADDR); 1032 break; 1033 1034 case IP_RECVTTL: 1035 OPTSET(INP_RECVTTL); 1036 break; 1037 1038 case IP_RECVIF: 1039 OPTSET(INP_RECVIF); 1040 break; 1041 1042 case IP_FAITH: 1043 OPTSET(INP_FAITH); 1044 break; 1045 1046 case IP_ONESBCAST: 1047 OPTSET(INP_ONESBCAST); 1048 break; 1049 case IP_DONTFRAG: 1050 OPTSET(INP_DONTFRAG); 1051 break; 1052 case IP_BINDANY: 1053 OPTSET(INP_BINDANY); 1054 break; 1055 case IP_RECVTOS: 1056 OPTSET(INP_RECVTOS); 1057 break; 1058 } 1059 break; 1060#undef OPTSET 1061 1062 /* 1063 * Multicast socket options are processed by the in_mcast 1064 * module. 1065 */ 1066 case IP_MULTICAST_IF: 1067 case IP_MULTICAST_VIF: 1068 case IP_MULTICAST_TTL: 1069 case IP_MULTICAST_LOOP: 1070 case IP_ADD_MEMBERSHIP: 1071 case IP_DROP_MEMBERSHIP: 1072 case IP_ADD_SOURCE_MEMBERSHIP: 1073 case IP_DROP_SOURCE_MEMBERSHIP: 1074 case IP_BLOCK_SOURCE: 1075 case IP_UNBLOCK_SOURCE: 1076 case IP_MSFILTER: 1077 case MCAST_JOIN_GROUP: 1078 case MCAST_LEAVE_GROUP: 1079 case MCAST_JOIN_SOURCE_GROUP: 1080 case MCAST_LEAVE_SOURCE_GROUP: 1081 case MCAST_BLOCK_SOURCE: 1082 case MCAST_UNBLOCK_SOURCE: 1083 error = inp_setmoptions(inp, sopt); 1084 break; 1085 1086 case IP_PORTRANGE: 1087 error = sooptcopyin(sopt, &optval, sizeof optval, 1088 sizeof optval); 1089 if (error) 1090 break; 1091 1092 INP_WLOCK(inp); 1093 switch (optval) { 1094 case IP_PORTRANGE_DEFAULT: 1095 inp->inp_flags &= ~(INP_LOWPORT); 1096 inp->inp_flags &= ~(INP_HIGHPORT); 1097 break; 1098 1099 case IP_PORTRANGE_HIGH: 1100 inp->inp_flags &= ~(INP_LOWPORT); 1101 inp->inp_flags |= INP_HIGHPORT; 1102 break; 1103 1104 case IP_PORTRANGE_LOW: 1105 inp->inp_flags &= ~(INP_HIGHPORT); 1106 inp->inp_flags |= INP_LOWPORT; 1107 break; 1108 1109 default: 1110 error = EINVAL; 1111 break; 1112 } 1113 INP_WUNLOCK(inp); 1114 break; 1115 1116#ifdef IPSEC 1117 case IP_IPSEC_POLICY: 1118 { 1119 caddr_t req; 1120 struct mbuf *m; 1121 1122 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1123 break; 1124 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1125 break; 1126 req = mtod(m, caddr_t); 1127 error = ipsec_set_policy(inp, sopt->sopt_name, req, 1128 m->m_len, (sopt->sopt_td != NULL) ? 1129 sopt->sopt_td->td_ucred : NULL); 1130 m_freem(m); 1131 break; 1132 } 1133#endif /* IPSEC */ 1134 1135 default: 1136 error = ENOPROTOOPT; 1137 break; 1138 } 1139 break; 1140 1141 case SOPT_GET: 1142 switch (sopt->sopt_name) { 1143 case IP_OPTIONS: 1144 case IP_RETOPTS: 1145 if (inp->inp_options) 1146 error = sooptcopyout(sopt, 1147 mtod(inp->inp_options, 1148 char *), 1149 inp->inp_options->m_len); 1150 else 1151 sopt->sopt_valsize = 0; 1152 break; 1153 1154 case IP_TOS: 1155 case IP_TTL: 1156 case IP_MINTTL: 1157 case IP_RECVOPTS: 1158 case IP_RECVRETOPTS: 1159 case IP_RECVDSTADDR: 1160 case IP_RECVTTL: 1161 case IP_RECVIF: 1162 case IP_PORTRANGE: 1163 case IP_FAITH: 1164 case IP_ONESBCAST: 1165 case IP_DONTFRAG: 1166 case IP_BINDANY: 1167 case IP_RECVTOS: 1168 switch (sopt->sopt_name) { 1169 1170 case IP_TOS: 1171 optval = inp->inp_ip_tos; 1172 break; 1173 1174 case IP_TTL: 1175 optval = inp->inp_ip_ttl; 1176 break; 1177 1178 case IP_MINTTL: 1179 optval = inp->inp_ip_minttl; 1180 break; 1181 1182#define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1183 1184 case IP_RECVOPTS: 1185 optval = OPTBIT(INP_RECVOPTS); 1186 break; 1187 1188 case IP_RECVRETOPTS: 1189 optval = OPTBIT(INP_RECVRETOPTS); 1190 break; 1191 1192 case IP_RECVDSTADDR: 1193 optval = OPTBIT(INP_RECVDSTADDR); 1194 break; 1195 1196 case IP_RECVTTL: 1197 optval = OPTBIT(INP_RECVTTL); 1198 break; 1199 1200 case IP_RECVIF: 1201 optval = OPTBIT(INP_RECVIF); 1202 break; 1203 1204 case IP_PORTRANGE: 1205 if (inp->inp_flags & INP_HIGHPORT) 1206 optval = IP_PORTRANGE_HIGH; 1207 else if (inp->inp_flags & INP_LOWPORT) 1208 optval = IP_PORTRANGE_LOW; 1209 else 1210 optval = 0; 1211 break; 1212 1213 case IP_FAITH: 1214 optval = OPTBIT(INP_FAITH); 1215 break; 1216 1217 case IP_ONESBCAST: 1218 optval = OPTBIT(INP_ONESBCAST); 1219 break; 1220 case IP_DONTFRAG: 1221 optval = OPTBIT(INP_DONTFRAG); 1222 break; 1223 case IP_BINDANY: 1224 optval = OPTBIT(INP_BINDANY); 1225 break; 1226 case IP_RECVTOS: 1227 optval = OPTBIT(INP_RECVTOS); 1228 break; 1229 } 1230 error = sooptcopyout(sopt, &optval, sizeof optval); 1231 break; 1232 1233 /* 1234 * Multicast socket options are processed by the in_mcast 1235 * module. 1236 */ 1237 case IP_MULTICAST_IF: 1238 case IP_MULTICAST_VIF: 1239 case IP_MULTICAST_TTL: 1240 case IP_MULTICAST_LOOP: 1241 case IP_MSFILTER: 1242 error = inp_getmoptions(inp, sopt); 1243 break; 1244 1245#ifdef IPSEC 1246 case IP_IPSEC_POLICY: 1247 { 1248 struct mbuf *m = NULL; 1249 caddr_t req = NULL; 1250 size_t len = 0; 1251 1252 if (m != 0) { 1253 req = mtod(m, caddr_t); 1254 len = m->m_len; 1255 } 1256 error = ipsec_get_policy(sotoinpcb(so), req, len, &m); 1257 if (error == 0) 1258 error = soopt_mcopyout(sopt, m); /* XXX */ 1259 if (error == 0) 1260 m_freem(m); 1261 break; 1262 } 1263#endif /* IPSEC */ 1264 1265 default: 1266 error = ENOPROTOOPT; 1267 break; 1268 } 1269 break; 1270 } 1271 return (error); 1272} 1273 1274/* 1275 * Routine called from ip_output() to loop back a copy of an IP multicast 1276 * packet to the input queue of a specified interface. Note that this 1277 * calls the output routine of the loopback "driver", but with an interface 1278 * pointer that might NOT be a loopback interface -- evil, but easier than 1279 * replicating that code here. 1280 */ 1281static void 1282ip_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in *dst, 1283 int hlen) 1284{ 1285 register struct ip *ip; 1286 struct mbuf *copym; 1287 1288 /* 1289 * Make a deep copy of the packet because we're going to 1290 * modify the pack in order to generate checksums. 1291 */ 1292 copym = m_dup(m, M_DONTWAIT); 1293 if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen)) 1294 copym = m_pullup(copym, hlen); 1295 if (copym != NULL) { 1296 /* If needed, compute the checksum and mark it as valid. */ 1297 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1298 in_delayed_cksum(copym); 1299 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1300 copym->m_pkthdr.csum_flags |= 1301 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1302 copym->m_pkthdr.csum_data = 0xffff; 1303 } 1304 /* 1305 * We don't bother to fragment if the IP length is greater 1306 * than the interface's MTU. Can this possibly matter? 1307 */ 1308 ip = mtod(copym, struct ip *); 1309 ip->ip_sum = 0; 1310 ip->ip_sum = in_cksum(copym, hlen); 1311#if 1 /* XXX */ 1312 if (dst->sin_family != AF_INET) { 1313 printf("ip_mloopback: bad address family %d\n", 1314 dst->sin_family); 1315 dst->sin_family = AF_INET; 1316 } 1317#endif 1318 if_simloop(ifp, copym, dst->sin_family, 0); 1319 } 1320} 1321