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: stable/11/sys/netinet/ip_output.c 347652 2019-05-16 08:24:53Z tuexen $"); 34 35#include "opt_inet.h" 36#include "opt_ipsec.h" 37#include "opt_mbuf_stress_test.h" 38#include "opt_mpath.h" 39#include "opt_route.h" 40#include "opt_sctp.h" 41#include "opt_rss.h" 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/kernel.h> 46#include <sys/lock.h> 47#include <sys/malloc.h> 48#include <sys/mbuf.h> 49#include <sys/priv.h> 50#include <sys/proc.h> 51#include <sys/protosw.h> 52#include <sys/rmlock.h> 53#include <sys/sdt.h> 54#include <sys/socket.h> 55#include <sys/socketvar.h> 56#include <sys/sysctl.h> 57#include <sys/ucred.h> 58 59#include <net/if.h> 60#include <net/if_var.h> 61#include <net/if_llatbl.h> 62#include <net/netisr.h> 63#include <net/pfil.h> 64#include <net/route.h> 65#include <net/flowtable.h> 66#ifdef RADIX_MPATH 67#include <net/radix_mpath.h> 68#endif 69#include <net/rss_config.h> 70#include <net/vnet.h> 71 72#include <netinet/in.h> 73#include <netinet/in_kdtrace.h> 74#include <netinet/in_systm.h> 75#include <netinet/ip.h> 76#include <netinet/in_pcb.h> 77#include <netinet/in_rss.h> 78#include <netinet/in_var.h> 79#include <netinet/ip_var.h> 80#include <netinet/ip_options.h> 81#ifdef SCTP 82#include <netinet/sctp.h> 83#include <netinet/sctp_crc32.h> 84#endif 85 86#include <netipsec/ipsec_support.h> 87 88#include <machine/in_cksum.h> 89 90#include <security/mac/mac_framework.h> 91 92#ifdef MBUF_STRESS_TEST 93static int mbuf_frag_size = 0; 94SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW, 95 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size"); 96#endif 97 98static void ip_mloopback(struct ifnet *, const struct mbuf *, int); 99 100 101extern int in_mcast_loop; 102extern struct protosw inetsw[]; 103 104static inline int 105ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, struct inpcb *inp, 106 struct sockaddr_in *dst, int *fibnum, int *error) 107{ 108 struct m_tag *fwd_tag = NULL; 109 struct mbuf *m; 110 struct in_addr odst; 111 struct ip *ip; 112 113 m = *mp; 114 ip = mtod(m, struct ip *); 115 116 /* Run through list of hooks for output packets. */ 117 odst.s_addr = ip->ip_dst.s_addr; 118 *error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, PFIL_OUT, 0, inp); 119 m = *mp; 120 if ((*error) != 0 || m == NULL) 121 return 1; /* Finished */ 122 123 ip = mtod(m, struct ip *); 124 125 /* See if destination IP address was changed by packet filter. */ 126 if (odst.s_addr != ip->ip_dst.s_addr) { 127 m->m_flags |= M_SKIP_FIREWALL; 128 /* If destination is now ourself drop to ip_input(). */ 129 if (in_localip(ip->ip_dst)) { 130 m->m_flags |= M_FASTFWD_OURS; 131 if (m->m_pkthdr.rcvif == NULL) 132 m->m_pkthdr.rcvif = V_loif; 133 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 134 m->m_pkthdr.csum_flags |= 135 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 136 m->m_pkthdr.csum_data = 0xffff; 137 } 138 m->m_pkthdr.csum_flags |= 139 CSUM_IP_CHECKED | CSUM_IP_VALID; 140#ifdef SCTP 141 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 142 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 143#endif 144 *error = netisr_queue(NETISR_IP, m); 145 return 1; /* Finished */ 146 } 147 148 bzero(dst, sizeof(*dst)); 149 dst->sin_family = AF_INET; 150 dst->sin_len = sizeof(*dst); 151 dst->sin_addr = ip->ip_dst; 152 153 return -1; /* Reloop */ 154 } 155 /* See if fib was changed by packet filter. */ 156 if ((*fibnum) != M_GETFIB(m)) { 157 m->m_flags |= M_SKIP_FIREWALL; 158 *fibnum = M_GETFIB(m); 159 return -1; /* Reloop for FIB change */ 160 } 161 162 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 163 if (m->m_flags & M_FASTFWD_OURS) { 164 if (m->m_pkthdr.rcvif == NULL) 165 m->m_pkthdr.rcvif = V_loif; 166 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 167 m->m_pkthdr.csum_flags |= 168 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 169 m->m_pkthdr.csum_data = 0xffff; 170 } 171#ifdef SCTP 172 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 173 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 174#endif 175 m->m_pkthdr.csum_flags |= 176 CSUM_IP_CHECKED | CSUM_IP_VALID; 177 178 *error = netisr_queue(NETISR_IP, m); 179 return 1; /* Finished */ 180 } 181 /* Or forward to some other address? */ 182 if ((m->m_flags & M_IP_NEXTHOP) && 183 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) { 184 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 185 m->m_flags |= M_SKIP_FIREWALL; 186 m->m_flags &= ~M_IP_NEXTHOP; 187 m_tag_delete(m, fwd_tag); 188 189 return -1; /* Reloop for CHANGE of dst */ 190 } 191 192 return 0; 193} 194 195/* 196 * IP output. The packet in mbuf chain m contains a skeletal IP 197 * header (with len, off, ttl, proto, tos, src, dst). 198 * The mbuf chain containing the packet will be freed. 199 * The mbuf opt, if present, will not be freed. 200 * If route ro is present and has ro_rt initialized, route lookup would be 201 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 202 * then result of route lookup is stored in ro->ro_rt. 203 * 204 * In the IP forwarding case, the packet will arrive with options already 205 * inserted, so must have a NULL opt pointer. 206 */ 207int 208ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags, 209 struct ip_moptions *imo, struct inpcb *inp) 210{ 211 struct rm_priotracker in_ifa_tracker; 212 struct ip *ip; 213 struct ifnet *ifp = NULL; /* keep compiler happy */ 214 struct mbuf *m0; 215 int hlen = sizeof (struct ip); 216 int mtu; 217 int error = 0; 218 struct sockaddr_in *dst; 219 const struct sockaddr_in *gw; 220 struct in_ifaddr *ia; 221 int isbroadcast; 222 uint16_t ip_len, ip_off; 223 struct route iproute; 224 struct rtentry *rte; /* cache for ro->ro_rt */ 225 uint32_t fibnum; 226 int have_ia_ref; 227#if defined(IPSEC) || defined(IPSEC_SUPPORT) 228 int no_route_but_check_spd = 0; 229#endif 230 M_ASSERTPKTHDR(m); 231 232 if (inp != NULL) { 233 INP_LOCK_ASSERT(inp); 234 M_SETFIB(m, inp->inp_inc.inc_fibnum); 235 if ((flags & IP_NODEFAULTFLOWID) == 0) { 236 m->m_pkthdr.flowid = inp->inp_flowid; 237 M_HASHTYPE_SET(m, inp->inp_flowtype); 238 } 239 } 240 241 if (ro == NULL) { 242 ro = &iproute; 243 bzero(ro, sizeof (*ro)); 244 } 245 246#ifdef FLOWTABLE 247 if (ro->ro_rt == NULL) 248 (void )flowtable_lookup(AF_INET, m, ro); 249#endif 250 251 if (opt) { 252 int len = 0; 253 m = ip_insertoptions(m, opt, &len); 254 if (len != 0) 255 hlen = len; /* ip->ip_hl is updated above */ 256 } 257 ip = mtod(m, struct ip *); 258 ip_len = ntohs(ip->ip_len); 259 ip_off = ntohs(ip->ip_off); 260 261 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 262 ip->ip_v = IPVERSION; 263 ip->ip_hl = hlen >> 2; 264 ip_fillid(ip); 265 } else { 266 /* Header already set, fetch hlen from there */ 267 hlen = ip->ip_hl << 2; 268 } 269 if ((flags & IP_FORWARDING) == 0) 270 IPSTAT_INC(ips_localout); 271 272 /* 273 * dst/gw handling: 274 * 275 * dst can be rewritten but always points to &ro->ro_dst. 276 * gw is readonly but can point either to dst OR rt_gateway, 277 * therefore we need restore gw if we're redoing lookup. 278 */ 279 gw = dst = (struct sockaddr_in *)&ro->ro_dst; 280 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 281 rte = ro->ro_rt; 282 if (rte == NULL) { 283 bzero(dst, sizeof(*dst)); 284 dst->sin_family = AF_INET; 285 dst->sin_len = sizeof(*dst); 286 dst->sin_addr = ip->ip_dst; 287 } 288again: 289 /* 290 * Validate route against routing table additions; 291 * a better/more specific route might have been added. 292 */ 293 if (inp) 294 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum); 295 /* 296 * If there is a cached route, 297 * check that it is to the same destination 298 * and is still up. If not, free it and try again. 299 * The address family should also be checked in case of sharing the 300 * cache with IPv6. 301 * Also check whether routing cache needs invalidation. 302 */ 303 rte = ro->ro_rt; 304 if (rte && ((rte->rt_flags & RTF_UP) == 0 || 305 rte->rt_ifp == NULL || 306 !RT_LINK_IS_UP(rte->rt_ifp) || 307 dst->sin_family != AF_INET || 308 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) { 309 RTFREE(rte); 310 rte = ro->ro_rt = (struct rtentry *)NULL; 311 if (ro->ro_lle) 312 LLE_FREE(ro->ro_lle); /* zeros ro_lle */ 313 ro->ro_lle = (struct llentry *)NULL; 314 } 315 ia = NULL; 316 have_ia_ref = 0; 317 /* 318 * If routing to interface only, short circuit routing lookup. 319 * The use of an all-ones broadcast address implies this; an 320 * interface is specified by the broadcast address of an interface, 321 * or the destination address of a ptp interface. 322 */ 323 if (flags & IP_SENDONES) { 324 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst), 325 M_GETFIB(m)))) == NULL && 326 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 327 M_GETFIB(m)))) == NULL) { 328 IPSTAT_INC(ips_noroute); 329 error = ENETUNREACH; 330 goto bad; 331 } 332 have_ia_ref = 1; 333 ip->ip_dst.s_addr = INADDR_BROADCAST; 334 dst->sin_addr = ip->ip_dst; 335 ifp = ia->ia_ifp; 336 ip->ip_ttl = 1; 337 isbroadcast = 1; 338 } else if (flags & IP_ROUTETOIF) { 339 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 340 M_GETFIB(m)))) == NULL && 341 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0, 342 M_GETFIB(m)))) == NULL) { 343 IPSTAT_INC(ips_noroute); 344 error = ENETUNREACH; 345 goto bad; 346 } 347 have_ia_ref = 1; 348 ifp = ia->ia_ifp; 349 ip->ip_ttl = 1; 350 isbroadcast = in_broadcast(dst->sin_addr, ifp); 351 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 352 imo != NULL && imo->imo_multicast_ifp != NULL) { 353 /* 354 * Bypass the normal routing lookup for multicast 355 * packets if the interface is specified. 356 */ 357 ifp = imo->imo_multicast_ifp; 358 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 359 if (ia) 360 have_ia_ref = 1; 361 isbroadcast = 0; /* fool gcc */ 362 } else { 363 /* 364 * We want to do any cloning requested by the link layer, 365 * as this is probably required in all cases for correct 366 * operation (as it is for ARP). 367 */ 368 if (rte == NULL) { 369#ifdef RADIX_MPATH 370 rtalloc_mpath_fib(ro, 371 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), 372 fibnum); 373#else 374 in_rtalloc_ign(ro, 0, fibnum); 375#endif 376 rte = ro->ro_rt; 377 } 378 if (rte == NULL || 379 (rte->rt_flags & RTF_UP) == 0 || 380 rte->rt_ifp == NULL || 381 !RT_LINK_IS_UP(rte->rt_ifp)) { 382#if defined(IPSEC) || defined(IPSEC_SUPPORT) 383 /* 384 * There is no route for this packet, but it is 385 * possible that a matching SPD entry exists. 386 */ 387 no_route_but_check_spd = 1; 388 mtu = 0; /* Silence GCC warning. */ 389 goto sendit; 390#endif 391 IPSTAT_INC(ips_noroute); 392 error = EHOSTUNREACH; 393 goto bad; 394 } 395 ia = ifatoia(rte->rt_ifa); 396 ifp = rte->rt_ifp; 397 counter_u64_add(rte->rt_pksent, 1); 398 rt_update_ro_flags(ro); 399 if (rte->rt_flags & RTF_GATEWAY) 400 gw = (struct sockaddr_in *)rte->rt_gateway; 401 if (rte->rt_flags & RTF_HOST) 402 isbroadcast = (rte->rt_flags & RTF_BROADCAST); 403 else 404 isbroadcast = in_broadcast(gw->sin_addr, ifp); 405 } 406 407 /* 408 * Calculate MTU. If we have a route that is up, use that, 409 * otherwise use the interface's MTU. 410 */ 411 if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST))) 412 mtu = rte->rt_mtu; 413 else 414 mtu = ifp->if_mtu; 415 /* Catch a possible divide by zero later. */ 416 KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p", 417 __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp)); 418 419 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 420 m->m_flags |= M_MCAST; 421 /* 422 * IP destination address is multicast. Make sure "gw" 423 * still points to the address in "ro". (It may have been 424 * changed to point to a gateway address, above.) 425 */ 426 gw = dst; 427 /* 428 * See if the caller provided any multicast options 429 */ 430 if (imo != NULL) { 431 ip->ip_ttl = imo->imo_multicast_ttl; 432 if (imo->imo_multicast_vif != -1) 433 ip->ip_src.s_addr = 434 ip_mcast_src ? 435 ip_mcast_src(imo->imo_multicast_vif) : 436 INADDR_ANY; 437 } else 438 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 439 /* 440 * Confirm that the outgoing interface supports multicast. 441 */ 442 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 443 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 444 IPSTAT_INC(ips_noroute); 445 error = ENETUNREACH; 446 goto bad; 447 } 448 } 449 /* 450 * If source address not specified yet, use address 451 * of outgoing interface. 452 */ 453 if (ip->ip_src.s_addr == INADDR_ANY) { 454 /* Interface may have no addresses. */ 455 if (ia != NULL) 456 ip->ip_src = IA_SIN(ia)->sin_addr; 457 } 458 459 if ((imo == NULL && in_mcast_loop) || 460 (imo && imo->imo_multicast_loop)) { 461 /* 462 * Loop back multicast datagram if not expressly 463 * forbidden to do so, even if we are not a member 464 * of the group; ip_input() will filter it later, 465 * thus deferring a hash lookup and mutex acquisition 466 * at the expense of a cheap copy using m_copym(). 467 */ 468 ip_mloopback(ifp, m, hlen); 469 } else { 470 /* 471 * If we are acting as a multicast router, perform 472 * multicast forwarding as if the packet had just 473 * arrived on the interface to which we are about 474 * to send. The multicast forwarding function 475 * recursively calls this function, using the 476 * IP_FORWARDING flag to prevent infinite recursion. 477 * 478 * Multicasts that are looped back by ip_mloopback(), 479 * above, will be forwarded by the ip_input() routine, 480 * if necessary. 481 */ 482 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) { 483 /* 484 * If rsvp daemon is not running, do not 485 * set ip_moptions. This ensures that the packet 486 * is multicast and not just sent down one link 487 * as prescribed by rsvpd. 488 */ 489 if (!V_rsvp_on) 490 imo = NULL; 491 if (ip_mforward && 492 ip_mforward(ip, ifp, m, imo) != 0) { 493 m_freem(m); 494 goto done; 495 } 496 } 497 } 498 499 /* 500 * Multicasts with a time-to-live of zero may be looped- 501 * back, above, but must not be transmitted on a network. 502 * Also, multicasts addressed to the loopback interface 503 * are not sent -- the above call to ip_mloopback() will 504 * loop back a copy. ip_input() will drop the copy if 505 * this host does not belong to the destination group on 506 * the loopback interface. 507 */ 508 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 509 m_freem(m); 510 goto done; 511 } 512 513 goto sendit; 514 } 515 516 /* 517 * If the source address is not specified yet, use the address 518 * of the outoing interface. 519 */ 520 if (ip->ip_src.s_addr == INADDR_ANY) { 521 /* Interface may have no addresses. */ 522 if (ia != NULL) { 523 ip->ip_src = IA_SIN(ia)->sin_addr; 524 } 525 } 526 527 /* 528 * Look for broadcast address and 529 * verify user is allowed to send 530 * such a packet. 531 */ 532 if (isbroadcast) { 533 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 534 error = EADDRNOTAVAIL; 535 goto bad; 536 } 537 if ((flags & IP_ALLOWBROADCAST) == 0) { 538 error = EACCES; 539 goto bad; 540 } 541 /* don't allow broadcast messages to be fragmented */ 542 if (ip_len > mtu) { 543 error = EMSGSIZE; 544 goto bad; 545 } 546 m->m_flags |= M_BCAST; 547 } else { 548 m->m_flags &= ~M_BCAST; 549 } 550 551sendit: 552#if defined(IPSEC) || defined(IPSEC_SUPPORT) 553 if (IPSEC_ENABLED(ipv4)) { 554 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) { 555 if (error == EINPROGRESS) 556 error = 0; 557 goto done; 558 } 559 } 560 /* 561 * Check if there was a route for this packet; return error if not. 562 */ 563 if (no_route_but_check_spd) { 564 IPSTAT_INC(ips_noroute); 565 error = EHOSTUNREACH; 566 goto bad; 567 } 568 /* Update variables that are affected by ipsec4_output(). */ 569 ip = mtod(m, struct ip *); 570 hlen = ip->ip_hl << 2; 571#endif /* IPSEC */ 572 573 /* Jump over all PFIL processing if hooks are not active. */ 574 if (PFIL_HOOKED(&V_inet_pfil_hook)) { 575 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) { 576 case 1: /* Finished */ 577 goto done; 578 579 case 0: /* Continue normally */ 580 ip = mtod(m, struct ip *); 581 break; 582 583 case -1: /* Need to try again */ 584 /* Reset everything for a new round */ 585 RO_RTFREE(ro); 586 if (have_ia_ref) 587 ifa_free(&ia->ia_ifa); 588 ro->ro_prepend = NULL; 589 rte = NULL; 590 gw = dst; 591 ip = mtod(m, struct ip *); 592 goto again; 593 594 } 595 } 596 597 /* 127/8 must not appear on wire - RFC1122. */ 598 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 599 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 600 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 601 IPSTAT_INC(ips_badaddr); 602 error = EADDRNOTAVAIL; 603 goto bad; 604 } 605 } 606 607 m->m_pkthdr.csum_flags |= CSUM_IP; 608 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 609 in_delayed_cksum(m); 610 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 611 } 612#ifdef SCTP 613 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 614 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 615 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 616 } 617#endif 618 619 /* 620 * If small enough for interface, or the interface will take 621 * care of the fragmentation for us, we can just send directly. 622 */ 623 if (ip_len <= mtu || 624 (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 625 ip->ip_sum = 0; 626 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 627 ip->ip_sum = in_cksum(m, hlen); 628 m->m_pkthdr.csum_flags &= ~CSUM_IP; 629 } 630 631 /* 632 * Record statistics for this interface address. 633 * With CSUM_TSO the byte/packet count will be slightly 634 * incorrect because we count the IP+TCP headers only 635 * once instead of for every generated packet. 636 */ 637 if (!(flags & IP_FORWARDING) && ia) { 638 if (m->m_pkthdr.csum_flags & CSUM_TSO) 639 counter_u64_add(ia->ia_ifa.ifa_opackets, 640 m->m_pkthdr.len / m->m_pkthdr.tso_segsz); 641 else 642 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 643 644 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len); 645 } 646#ifdef MBUF_STRESS_TEST 647 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 648 m = m_fragment(m, M_NOWAIT, mbuf_frag_size); 649#endif 650 /* 651 * Reset layer specific mbuf flags 652 * to avoid confusing lower layers. 653 */ 654 m_clrprotoflags(m); 655 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 656 error = (*ifp->if_output)(ifp, m, 657 (const struct sockaddr *)gw, ro); 658 goto done; 659 } 660 661 /* Balk when DF bit is set or the interface didn't support TSO. */ 662 if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) { 663 error = EMSGSIZE; 664 IPSTAT_INC(ips_cantfrag); 665 goto bad; 666 } 667 668 /* 669 * Too large for interface; fragment if possible. If successful, 670 * on return, m will point to a list of packets to be sent. 671 */ 672 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist); 673 if (error) 674 goto bad; 675 for (; m; m = m0) { 676 m0 = m->m_nextpkt; 677 m->m_nextpkt = 0; 678 if (error == 0) { 679 /* Record statistics for this interface address. */ 680 if (ia != NULL) { 681 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 682 counter_u64_add(ia->ia_ifa.ifa_obytes, 683 m->m_pkthdr.len); 684 } 685 /* 686 * Reset layer specific mbuf flags 687 * to avoid confusing upper layers. 688 */ 689 m_clrprotoflags(m); 690 691 IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp, 692 mtod(m, struct ip *), NULL); 693 error = (*ifp->if_output)(ifp, m, 694 (const struct sockaddr *)gw, ro); 695 } else 696 m_freem(m); 697 } 698 699 if (error == 0) 700 IPSTAT_INC(ips_fragmented); 701 702done: 703 /* 704 * Release the route if using our private route, or if 705 * (with flowtable) we don't have our own reference. 706 */ 707 if (ro == &iproute || ro->ro_flags & RT_NORTREF) 708 RO_RTFREE(ro); 709 else if (rte == NULL) 710 /* 711 * If the caller supplied a route but somehow the reference 712 * to it has been released need to prevent the caller 713 * calling RTFREE on it again. 714 */ 715 ro->ro_rt = NULL; 716 if (have_ia_ref) 717 ifa_free(&ia->ia_ifa); 718 return (error); 719bad: 720 m_freem(m); 721 goto done; 722} 723 724/* 725 * Create a chain of fragments which fit the given mtu. m_frag points to the 726 * mbuf to be fragmented; on return it points to the chain with the fragments. 727 * Return 0 if no error. If error, m_frag may contain a partially built 728 * chain of fragments that should be freed by the caller. 729 * 730 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist) 731 */ 732int 733ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 734 u_long if_hwassist_flags) 735{ 736 int error = 0; 737 int hlen = ip->ip_hl << 2; 738 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */ 739 int off; 740 struct mbuf *m0 = *m_frag; /* the original packet */ 741 int firstlen; 742 struct mbuf **mnext; 743 int nfrags; 744 uint16_t ip_len, ip_off; 745 746 ip_len = ntohs(ip->ip_len); 747 ip_off = ntohs(ip->ip_off); 748 749 if (ip_off & IP_DF) { /* Fragmentation not allowed */ 750 IPSTAT_INC(ips_cantfrag); 751 return EMSGSIZE; 752 } 753 754 /* 755 * Must be able to put at least 8 bytes per fragment. 756 */ 757 if (len < 8) 758 return EMSGSIZE; 759 760 /* 761 * If the interface will not calculate checksums on 762 * fragmented packets, then do it here. 763 */ 764 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 765 in_delayed_cksum(m0); 766 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 767 } 768#ifdef SCTP 769 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) { 770 sctp_delayed_cksum(m0, hlen); 771 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 772 } 773#endif 774 if (len > PAGE_SIZE) { 775 /* 776 * Fragment large datagrams such that each segment 777 * contains a multiple of PAGE_SIZE amount of data, 778 * plus headers. This enables a receiver to perform 779 * page-flipping zero-copy optimizations. 780 * 781 * XXX When does this help given that sender and receiver 782 * could have different page sizes, and also mtu could 783 * be less than the receiver's page size ? 784 */ 785 int newlen; 786 787 off = MIN(mtu, m0->m_pkthdr.len); 788 789 /* 790 * firstlen (off - hlen) must be aligned on an 791 * 8-byte boundary 792 */ 793 if (off < hlen) 794 goto smart_frag_failure; 795 off = ((off - hlen) & ~7) + hlen; 796 newlen = (~PAGE_MASK) & mtu; 797 if ((newlen + sizeof (struct ip)) > mtu) { 798 /* we failed, go back the default */ 799smart_frag_failure: 800 newlen = len; 801 off = hlen + len; 802 } 803 len = newlen; 804 805 } else { 806 off = hlen + len; 807 } 808 809 firstlen = off - hlen; 810 mnext = &m0->m_nextpkt; /* pointer to next packet */ 811 812 /* 813 * Loop through length of segment after first fragment, 814 * make new header and copy data of each part and link onto chain. 815 * Here, m0 is the original packet, m is the fragment being created. 816 * The fragments are linked off the m_nextpkt of the original 817 * packet, which after processing serves as the first fragment. 818 */ 819 for (nfrags = 1; off < ip_len; off += len, nfrags++) { 820 struct ip *mhip; /* ip header on the fragment */ 821 struct mbuf *m; 822 int mhlen = sizeof (struct ip); 823 824 m = m_gethdr(M_NOWAIT, MT_DATA); 825 if (m == NULL) { 826 error = ENOBUFS; 827 IPSTAT_INC(ips_odropped); 828 goto done; 829 } 830 /* 831 * Make sure the complete packet header gets copied 832 * from the originating mbuf to the newly created 833 * mbuf. This also ensures that existing firewall 834 * classification(s), VLAN tags and so on get copied 835 * to the resulting fragmented packet(s): 836 */ 837 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) { 838 m_free(m); 839 error = ENOBUFS; 840 IPSTAT_INC(ips_odropped); 841 goto done; 842 } 843 /* 844 * In the first mbuf, leave room for the link header, then 845 * copy the original IP header including options. The payload 846 * goes into an additional mbuf chain returned by m_copym(). 847 */ 848 m->m_data += max_linkhdr; 849 mhip = mtod(m, struct ip *); 850 *mhip = *ip; 851 if (hlen > sizeof (struct ip)) { 852 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 853 mhip->ip_v = IPVERSION; 854 mhip->ip_hl = mhlen >> 2; 855 } 856 m->m_len = mhlen; 857 /* XXX do we need to add ip_off below ? */ 858 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 859 if (off + len >= ip_len) 860 len = ip_len - off; 861 else 862 mhip->ip_off |= IP_MF; 863 mhip->ip_len = htons((u_short)(len + mhlen)); 864 m->m_next = m_copym(m0, off, len, M_NOWAIT); 865 if (m->m_next == NULL) { /* copy failed */ 866 m_free(m); 867 error = ENOBUFS; /* ??? */ 868 IPSTAT_INC(ips_odropped); 869 goto done; 870 } 871 m->m_pkthdr.len = mhlen + len; 872#ifdef MAC 873 mac_netinet_fragment(m0, m); 874#endif 875 mhip->ip_off = htons(mhip->ip_off); 876 mhip->ip_sum = 0; 877 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 878 mhip->ip_sum = in_cksum(m, mhlen); 879 m->m_pkthdr.csum_flags &= ~CSUM_IP; 880 } 881 *mnext = m; 882 mnext = &m->m_nextpkt; 883 } 884 IPSTAT_ADD(ips_ofragments, nfrags); 885 886 /* 887 * Update first fragment by trimming what's been copied out 888 * and updating header. 889 */ 890 m_adj(m0, hlen + firstlen - ip_len); 891 m0->m_pkthdr.len = hlen + firstlen; 892 ip->ip_len = htons((u_short)m0->m_pkthdr.len); 893 ip->ip_off = htons(ip_off | IP_MF); 894 ip->ip_sum = 0; 895 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 896 ip->ip_sum = in_cksum(m0, hlen); 897 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 898 } 899 900done: 901 *m_frag = m0; 902 return error; 903} 904 905void 906in_delayed_cksum(struct mbuf *m) 907{ 908 struct ip *ip; 909 uint16_t csum, offset, ip_len; 910 911 ip = mtod(m, struct ip *); 912 offset = ip->ip_hl << 2 ; 913 ip_len = ntohs(ip->ip_len); 914 csum = in_cksum_skip(m, ip_len, offset); 915 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0) 916 csum = 0xffff; 917 offset += m->m_pkthdr.csum_data; /* checksum offset */ 918 919 /* find the mbuf in the chain where the checksum starts*/ 920 while ((m != NULL) && (offset >= m->m_len)) { 921 offset -= m->m_len; 922 m = m->m_next; 923 } 924 KASSERT(m != NULL, ("in_delayed_cksum: checksum outside mbuf chain.")); 925 KASSERT(offset + sizeof(u_short) <= m->m_len, ("in_delayed_cksum: checksum split between mbufs.")); 926 *(u_short *)(m->m_data + offset) = csum; 927} 928 929/* 930 * IP socket option processing. 931 */ 932int 933ip_ctloutput(struct socket *so, struct sockopt *sopt) 934{ 935 struct inpcb *inp = sotoinpcb(so); 936 int error, optval; 937#ifdef RSS 938 uint32_t rss_bucket; 939 int retval; 940#endif 941 942 error = optval = 0; 943 if (sopt->sopt_level != IPPROTO_IP) { 944 error = EINVAL; 945 946 if (sopt->sopt_level == SOL_SOCKET && 947 sopt->sopt_dir == SOPT_SET) { 948 switch (sopt->sopt_name) { 949 case SO_REUSEADDR: 950 INP_WLOCK(inp); 951 if ((so->so_options & SO_REUSEADDR) != 0) 952 inp->inp_flags2 |= INP_REUSEADDR; 953 else 954 inp->inp_flags2 &= ~INP_REUSEADDR; 955 INP_WUNLOCK(inp); 956 error = 0; 957 break; 958 case SO_REUSEPORT: 959 INP_WLOCK(inp); 960 if ((so->so_options & SO_REUSEPORT) != 0) 961 inp->inp_flags2 |= INP_REUSEPORT; 962 else 963 inp->inp_flags2 &= ~INP_REUSEPORT; 964 INP_WUNLOCK(inp); 965 error = 0; 966 break; 967 case SO_SETFIB: 968 INP_WLOCK(inp); 969 inp->inp_inc.inc_fibnum = so->so_fibnum; 970 INP_WUNLOCK(inp); 971 error = 0; 972 break; 973 default: 974 break; 975 } 976 } 977 return (error); 978 } 979 980 switch (sopt->sopt_dir) { 981 case SOPT_SET: 982 switch (sopt->sopt_name) { 983 case IP_OPTIONS: 984#ifdef notyet 985 case IP_RETOPTS: 986#endif 987 { 988 struct mbuf *m; 989 if (sopt->sopt_valsize > MLEN) { 990 error = EMSGSIZE; 991 break; 992 } 993 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA); 994 if (m == NULL) { 995 error = ENOBUFS; 996 break; 997 } 998 m->m_len = sopt->sopt_valsize; 999 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 1000 m->m_len); 1001 if (error) { 1002 m_free(m); 1003 break; 1004 } 1005 INP_WLOCK(inp); 1006 error = ip_pcbopts(inp, sopt->sopt_name, m); 1007 INP_WUNLOCK(inp); 1008 return (error); 1009 } 1010 1011 case IP_BINDANY: 1012 if (sopt->sopt_td != NULL) { 1013 error = priv_check(sopt->sopt_td, 1014 PRIV_NETINET_BINDANY); 1015 if (error) 1016 break; 1017 } 1018 /* FALLTHROUGH */ 1019 case IP_BINDMULTI: 1020#ifdef RSS 1021 case IP_RSS_LISTEN_BUCKET: 1022#endif 1023 case IP_TOS: 1024 case IP_TTL: 1025 case IP_MINTTL: 1026 case IP_RECVOPTS: 1027 case IP_RECVRETOPTS: 1028 case IP_RECVDSTADDR: 1029 case IP_RECVTTL: 1030 case IP_RECVIF: 1031 case IP_ONESBCAST: 1032 case IP_DONTFRAG: 1033 case IP_RECVTOS: 1034 case IP_RECVFLOWID: 1035#ifdef RSS 1036 case IP_RECVRSSBUCKETID: 1037#endif 1038 error = sooptcopyin(sopt, &optval, sizeof optval, 1039 sizeof optval); 1040 if (error) 1041 break; 1042 1043 switch (sopt->sopt_name) { 1044 case IP_TOS: 1045 inp->inp_ip_tos = optval; 1046 break; 1047 1048 case IP_TTL: 1049 inp->inp_ip_ttl = optval; 1050 break; 1051 1052 case IP_MINTTL: 1053 if (optval >= 0 && optval <= MAXTTL) 1054 inp->inp_ip_minttl = optval; 1055 else 1056 error = EINVAL; 1057 break; 1058 1059#define OPTSET(bit) do { \ 1060 INP_WLOCK(inp); \ 1061 if (optval) \ 1062 inp->inp_flags |= bit; \ 1063 else \ 1064 inp->inp_flags &= ~bit; \ 1065 INP_WUNLOCK(inp); \ 1066} while (0) 1067 1068#define OPTSET2(bit, val) do { \ 1069 INP_WLOCK(inp); \ 1070 if (val) \ 1071 inp->inp_flags2 |= bit; \ 1072 else \ 1073 inp->inp_flags2 &= ~bit; \ 1074 INP_WUNLOCK(inp); \ 1075} while (0) 1076 1077 case IP_RECVOPTS: 1078 OPTSET(INP_RECVOPTS); 1079 break; 1080 1081 case IP_RECVRETOPTS: 1082 OPTSET(INP_RECVRETOPTS); 1083 break; 1084 1085 case IP_RECVDSTADDR: 1086 OPTSET(INP_RECVDSTADDR); 1087 break; 1088 1089 case IP_RECVTTL: 1090 OPTSET(INP_RECVTTL); 1091 break; 1092 1093 case IP_RECVIF: 1094 OPTSET(INP_RECVIF); 1095 break; 1096 1097 case IP_ONESBCAST: 1098 OPTSET(INP_ONESBCAST); 1099 break; 1100 case IP_DONTFRAG: 1101 OPTSET(INP_DONTFRAG); 1102 break; 1103 case IP_BINDANY: 1104 OPTSET(INP_BINDANY); 1105 break; 1106 case IP_RECVTOS: 1107 OPTSET(INP_RECVTOS); 1108 break; 1109 case IP_BINDMULTI: 1110 OPTSET2(INP_BINDMULTI, optval); 1111 break; 1112 case IP_RECVFLOWID: 1113 OPTSET2(INP_RECVFLOWID, optval); 1114 break; 1115#ifdef RSS 1116 case IP_RSS_LISTEN_BUCKET: 1117 if ((optval >= 0) && 1118 (optval < rss_getnumbuckets())) { 1119 inp->inp_rss_listen_bucket = optval; 1120 OPTSET2(INP_RSS_BUCKET_SET, 1); 1121 } else { 1122 error = EINVAL; 1123 } 1124 break; 1125 case IP_RECVRSSBUCKETID: 1126 OPTSET2(INP_RECVRSSBUCKETID, optval); 1127 break; 1128#endif 1129 } 1130 break; 1131#undef OPTSET 1132#undef OPTSET2 1133 1134 /* 1135 * Multicast socket options are processed by the in_mcast 1136 * module. 1137 */ 1138 case IP_MULTICAST_IF: 1139 case IP_MULTICAST_VIF: 1140 case IP_MULTICAST_TTL: 1141 case IP_MULTICAST_LOOP: 1142 case IP_ADD_MEMBERSHIP: 1143 case IP_DROP_MEMBERSHIP: 1144 case IP_ADD_SOURCE_MEMBERSHIP: 1145 case IP_DROP_SOURCE_MEMBERSHIP: 1146 case IP_BLOCK_SOURCE: 1147 case IP_UNBLOCK_SOURCE: 1148 case IP_MSFILTER: 1149 case MCAST_JOIN_GROUP: 1150 case MCAST_LEAVE_GROUP: 1151 case MCAST_JOIN_SOURCE_GROUP: 1152 case MCAST_LEAVE_SOURCE_GROUP: 1153 case MCAST_BLOCK_SOURCE: 1154 case MCAST_UNBLOCK_SOURCE: 1155 error = inp_setmoptions(inp, sopt); 1156 break; 1157 1158 case IP_PORTRANGE: 1159 error = sooptcopyin(sopt, &optval, sizeof optval, 1160 sizeof optval); 1161 if (error) 1162 break; 1163 1164 INP_WLOCK(inp); 1165 switch (optval) { 1166 case IP_PORTRANGE_DEFAULT: 1167 inp->inp_flags &= ~(INP_LOWPORT); 1168 inp->inp_flags &= ~(INP_HIGHPORT); 1169 break; 1170 1171 case IP_PORTRANGE_HIGH: 1172 inp->inp_flags &= ~(INP_LOWPORT); 1173 inp->inp_flags |= INP_HIGHPORT; 1174 break; 1175 1176 case IP_PORTRANGE_LOW: 1177 inp->inp_flags &= ~(INP_HIGHPORT); 1178 inp->inp_flags |= INP_LOWPORT; 1179 break; 1180 1181 default: 1182 error = EINVAL; 1183 break; 1184 } 1185 INP_WUNLOCK(inp); 1186 break; 1187 1188#if defined(IPSEC) || defined(IPSEC_SUPPORT) 1189 case IP_IPSEC_POLICY: 1190 if (IPSEC_ENABLED(ipv4)) { 1191 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1192 break; 1193 } 1194 /* FALLTHROUGH */ 1195#endif /* IPSEC */ 1196 1197 default: 1198 error = ENOPROTOOPT; 1199 break; 1200 } 1201 break; 1202 1203 case SOPT_GET: 1204 switch (sopt->sopt_name) { 1205 case IP_OPTIONS: 1206 case IP_RETOPTS: 1207 if (inp->inp_options) 1208 error = sooptcopyout(sopt, 1209 mtod(inp->inp_options, 1210 char *), 1211 inp->inp_options->m_len); 1212 else 1213 sopt->sopt_valsize = 0; 1214 break; 1215 1216 case IP_TOS: 1217 case IP_TTL: 1218 case IP_MINTTL: 1219 case IP_RECVOPTS: 1220 case IP_RECVRETOPTS: 1221 case IP_RECVDSTADDR: 1222 case IP_RECVTTL: 1223 case IP_RECVIF: 1224 case IP_PORTRANGE: 1225 case IP_ONESBCAST: 1226 case IP_DONTFRAG: 1227 case IP_BINDANY: 1228 case IP_RECVTOS: 1229 case IP_BINDMULTI: 1230 case IP_FLOWID: 1231 case IP_FLOWTYPE: 1232 case IP_RECVFLOWID: 1233#ifdef RSS 1234 case IP_RSSBUCKETID: 1235 case IP_RECVRSSBUCKETID: 1236#endif 1237 switch (sopt->sopt_name) { 1238 1239 case IP_TOS: 1240 optval = inp->inp_ip_tos; 1241 break; 1242 1243 case IP_TTL: 1244 optval = inp->inp_ip_ttl; 1245 break; 1246 1247 case IP_MINTTL: 1248 optval = inp->inp_ip_minttl; 1249 break; 1250 1251#define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1252#define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0) 1253 1254 case IP_RECVOPTS: 1255 optval = OPTBIT(INP_RECVOPTS); 1256 break; 1257 1258 case IP_RECVRETOPTS: 1259 optval = OPTBIT(INP_RECVRETOPTS); 1260 break; 1261 1262 case IP_RECVDSTADDR: 1263 optval = OPTBIT(INP_RECVDSTADDR); 1264 break; 1265 1266 case IP_RECVTTL: 1267 optval = OPTBIT(INP_RECVTTL); 1268 break; 1269 1270 case IP_RECVIF: 1271 optval = OPTBIT(INP_RECVIF); 1272 break; 1273 1274 case IP_PORTRANGE: 1275 if (inp->inp_flags & INP_HIGHPORT) 1276 optval = IP_PORTRANGE_HIGH; 1277 else if (inp->inp_flags & INP_LOWPORT) 1278 optval = IP_PORTRANGE_LOW; 1279 else 1280 optval = 0; 1281 break; 1282 1283 case IP_ONESBCAST: 1284 optval = OPTBIT(INP_ONESBCAST); 1285 break; 1286 case IP_DONTFRAG: 1287 optval = OPTBIT(INP_DONTFRAG); 1288 break; 1289 case IP_BINDANY: 1290 optval = OPTBIT(INP_BINDANY); 1291 break; 1292 case IP_RECVTOS: 1293 optval = OPTBIT(INP_RECVTOS); 1294 break; 1295 case IP_FLOWID: 1296 optval = inp->inp_flowid; 1297 break; 1298 case IP_FLOWTYPE: 1299 optval = inp->inp_flowtype; 1300 break; 1301 case IP_RECVFLOWID: 1302 optval = OPTBIT2(INP_RECVFLOWID); 1303 break; 1304#ifdef RSS 1305 case IP_RSSBUCKETID: 1306 retval = rss_hash2bucket(inp->inp_flowid, 1307 inp->inp_flowtype, 1308 &rss_bucket); 1309 if (retval == 0) 1310 optval = rss_bucket; 1311 else 1312 error = EINVAL; 1313 break; 1314 case IP_RECVRSSBUCKETID: 1315 optval = OPTBIT2(INP_RECVRSSBUCKETID); 1316 break; 1317#endif 1318 case IP_BINDMULTI: 1319 optval = OPTBIT2(INP_BINDMULTI); 1320 break; 1321 } 1322 error = sooptcopyout(sopt, &optval, sizeof optval); 1323 break; 1324 1325 /* 1326 * Multicast socket options are processed by the in_mcast 1327 * module. 1328 */ 1329 case IP_MULTICAST_IF: 1330 case IP_MULTICAST_VIF: 1331 case IP_MULTICAST_TTL: 1332 case IP_MULTICAST_LOOP: 1333 case IP_MSFILTER: 1334 error = inp_getmoptions(inp, sopt); 1335 break; 1336 1337#if defined(IPSEC) || defined(IPSEC_SUPPORT) 1338 case IP_IPSEC_POLICY: 1339 if (IPSEC_ENABLED(ipv4)) { 1340 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1341 break; 1342 } 1343 /* FALLTHROUGH */ 1344#endif /* IPSEC */ 1345 1346 default: 1347 error = ENOPROTOOPT; 1348 break; 1349 } 1350 break; 1351 } 1352 return (error); 1353} 1354 1355/* 1356 * Routine called from ip_output() to loop back a copy of an IP multicast 1357 * packet to the input queue of a specified interface. Note that this 1358 * calls the output routine of the loopback "driver", but with an interface 1359 * pointer that might NOT be a loopback interface -- evil, but easier than 1360 * replicating that code here. 1361 */ 1362static void 1363ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen) 1364{ 1365 struct ip *ip; 1366 struct mbuf *copym; 1367 1368 /* 1369 * Make a deep copy of the packet because we're going to 1370 * modify the pack in order to generate checksums. 1371 */ 1372 copym = m_dup(m, M_NOWAIT); 1373 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen)) 1374 copym = m_pullup(copym, hlen); 1375 if (copym != NULL) { 1376 /* If needed, compute the checksum and mark it as valid. */ 1377 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1378 in_delayed_cksum(copym); 1379 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1380 copym->m_pkthdr.csum_flags |= 1381 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1382 copym->m_pkthdr.csum_data = 0xffff; 1383 } 1384 /* 1385 * We don't bother to fragment if the IP length is greater 1386 * than the interface's MTU. Can this possibly matter? 1387 */ 1388 ip = mtod(copym, struct ip *); 1389 ip->ip_sum = 0; 1390 ip->ip_sum = in_cksum(copym, hlen); 1391 if_simloop(ifp, copym, AF_INET, 0); 1392 } 1393} 1394