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("$FreeBSD$"); 34 35 #include "opt_inet.h" 36 #include "opt_ipfw.h" 37 #include "opt_ipsec.h" 38 #include "opt_mbuf_stress_test.h" 39 #include "opt_mpath.h" 40 #include "opt_route.h" 41 #include "opt_sctp.h" 42 #include "opt_rss.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/protosw.h> 53 #include <sys/rmlock.h> 54 #include <sys/sdt.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 #include <sys/sysctl.h> 58 #include <sys/ucred.h> 59 60 #include <net/if.h> 61 #include <net/if_var.h> 62 #include <net/if_llatbl.h> 63 #include <net/netisr.h> 64 #include <net/pfil.h> 65 #include <net/route.h> 66 #include <net/flowtable.h> 67 #ifdef RADIX_MPATH 68 #include <net/radix_mpath.h> 69 #endif 70 #include <net/rss_config.h> 71 #include <net/vnet.h> 72 73 #include <netinet/in.h> 74 #include <netinet/in_kdtrace.h> 75 #include <netinet/in_systm.h> 76 #include <netinet/ip.h> 77 #include <netinet/in_pcb.h> 78 #include <netinet/in_rss.h> 79 #include <netinet/in_var.h> 80 #include <netinet/ip_var.h> 81 #include <netinet/ip_options.h> 82 #ifdef SCTP 83 #include <netinet/sctp.h> 84 #include <netinet/sctp_crc32.h> 85 #endif 86 87 #ifdef IPSEC 88 #include <netinet/ip_ipsec.h> 89 #include <netipsec/ipsec.h> 90 #endif /* IPSEC*/ 91 92 #include <machine/in_cksum.h> 93 94 #include <security/mac/mac_framework.h> 95 96 #ifdef MBUF_STRESS_TEST 97 static int mbuf_frag_size = 0; 98 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW, 99 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size"); 100 #endif 101 102 static void ip_mloopback 103 (struct ifnet *, struct mbuf *, struct sockaddr_in *, int); 104 105 106 extern int in_mcast_loop; 107 extern struct protosw inetsw[]; 108 109 static inline int 110 ip_output_pfil(struct mbuf *m, struct ifnet *ifp, struct inpcb *inp, 111 struct sockaddr_in *dst, int *fibnum, int *error) 112 { 113 struct m_tag *fwd_tag = NULL; 114 struct in_addr odst; 115 struct ip *ip; 116 117 ip = mtod(m, struct ip *); 118 119 /* Run through list of hooks for output packets. */ 120 odst.s_addr = ip->ip_dst.s_addr; 121 *error = pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_OUT, inp); 122 if ((*error) != 0 || m == NULL) 123 return 1; /* Finished */ 124 125 ip = mtod(m, struct ip *); 126 127 /* See if destination IP address was changed by packet filter. */ 128 if (odst.s_addr != ip->ip_dst.s_addr) { 129 m->m_flags |= M_SKIP_FIREWALL; 130 /* If destination is now ourself drop to ip_input(). */ 131 if (in_localip(ip->ip_dst)) { 132 m->m_flags |= M_FASTFWD_OURS; 133 if (m->m_pkthdr.rcvif == NULL) 134 m->m_pkthdr.rcvif = V_loif; 135 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 136 m->m_pkthdr.csum_flags |= 137 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 138 m->m_pkthdr.csum_data = 0xffff; 139 } 140 m->m_pkthdr.csum_flags |= 141 CSUM_IP_CHECKED | CSUM_IP_VALID; 142 #ifdef SCTP 143 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 144 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 145 #endif 146 *error = netisr_queue(NETISR_IP, m); 147 return 1; /* Finished */ 148 } 149 150 bzero(dst, sizeof(*dst)); 151 dst->sin_family = AF_INET; 152 dst->sin_len = sizeof(*dst); 153 dst->sin_addr = ip->ip_dst; 154 155 return -1; /* Reloop */ 156 } 157 /* See if fib was changed by packet filter. */ 158 if ((*fibnum) != M_GETFIB(m)) { 159 m->m_flags |= M_SKIP_FIREWALL; 160 *fibnum = M_GETFIB(m); 161 return -1; /* Reloop for FIB change */ 162 } 163 164 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 165 if (m->m_flags & M_FASTFWD_OURS) { 166 if (m->m_pkthdr.rcvif == NULL) 167 m->m_pkthdr.rcvif = V_loif; 168 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 169 m->m_pkthdr.csum_flags |= 170 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 171 m->m_pkthdr.csum_data = 0xffff; 172 } 173 #ifdef SCTP 174 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 175 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 176 #endif 177 m->m_pkthdr.csum_flags |= 178 CSUM_IP_CHECKED | CSUM_IP_VALID; 179 180 *error = netisr_queue(NETISR_IP, m); 181 return 1; /* Finished */ 182 } 183 /* Or forward to some other address? */ 184 if ((m->m_flags & M_IP_NEXTHOP) && 185 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) { 186 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 187 m->m_flags |= M_SKIP_FIREWALL; 188 m->m_flags &= ~M_IP_NEXTHOP; 189 m_tag_delete(m, fwd_tag); 190 191 return -1; /* Reloop for CHANGE of dst */ 192 } 193 194 return 0; 195 } 196 197 /* 198 * IP output. The packet in mbuf chain m contains a skeletal IP 199 * header (with len, off, ttl, proto, tos, src, dst). 200 * The mbuf chain containing the packet will be freed. 201 * The mbuf opt, if present, will not be freed. 202 * If route ro is present and has ro_rt initialized, route lookup would be 203 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 204 * then result of route lookup is stored in ro->ro_rt. 205 * 206 * In the IP forwarding case, the packet will arrive with options already 207 * inserted, so must have a NULL opt pointer. 208 */ 209 int 210 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags, 211 struct ip_moptions *imo, struct inpcb *inp) 212 { 213 struct rm_priotracker in_ifa_tracker; 214 struct ip *ip; 215 struct ifnet *ifp = NULL; /* keep compiler happy */ 216 struct mbuf *m0; 217 int hlen = sizeof (struct ip); 218 int mtu; 219 int error = 0; 220 struct sockaddr_in *dst; 221 const struct sockaddr_in *gw; 222 struct in_ifaddr *ia; 223 int isbroadcast; 224 uint16_t ip_len, ip_off; 225 struct route iproute; 226 struct rtentry *rte; /* cache for ro->ro_rt */ 227 uint32_t fibnum; 228 int have_ia_ref; 229 #ifdef IPSEC 230 int no_route_but_check_spd = 0; 231 #endif 232 M_ASSERTPKTHDR(m); 233 234 if (inp != NULL) { 235 INP_LOCK_ASSERT(inp); 236 M_SETFIB(m, inp->inp_inc.inc_fibnum); 237 if ((flags & IP_NODEFAULTFLOWID) == 0) { 238 m->m_pkthdr.flowid = inp->inp_flowid; 239 M_HASHTYPE_SET(m, inp->inp_flowtype); 240 } 241 } 242 243 if (ro == NULL) { 244 ro = &iproute; 245 bzero(ro, sizeof (*ro)); 246 } 247 248 #ifdef FLOWTABLE 249 if (ro->ro_rt == NULL) 250 (void )flowtable_lookup(AF_INET, m, ro); 251 #endif 252 253 if (opt) { 254 int len = 0; 255 m = ip_insertoptions(m, opt, &len); 256 if (len != 0) 257 hlen = len; /* ip->ip_hl is updated above */ 258 } 259 ip = mtod(m, struct ip *); 260 ip_len = ntohs(ip->ip_len); 261 ip_off = ntohs(ip->ip_off); 262 263 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 264 ip->ip_v = IPVERSION; 265 ip->ip_hl = hlen >> 2; 266 ip_fillid(ip); 267 IPSTAT_INC(ips_localout); 268 } else { 269 /* Header already set, fetch hlen from there */ 270 hlen = ip->ip_hl << 2; 271 } 272 273 /* 274 * dst/gw handling: 275 * 276 * dst can be rewritten but always points to &ro->ro_dst. 277 * gw is readonly but can point either to dst OR rt_gateway, 278 * therefore we need restore gw if we're redoing lookup. 279 */ 280 gw = dst = (struct sockaddr_in *)&ro->ro_dst; 281 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 282 rte = ro->ro_rt; 283 /* 284 * The address family should also be checked in case of sharing 285 * the cache with IPv6. 286 */ 287 if (rte == NULL || dst->sin_family != AF_INET) { 288 bzero(dst, sizeof(*dst)); 289 dst->sin_family = AF_INET; 290 dst->sin_len = sizeof(*dst); 291 dst->sin_addr = ip->ip_dst; 292 } 293 again: 294 ia = NULL; 295 have_ia_ref = 0; 296 /* 297 * If routing to interface only, short circuit routing lookup. 298 * The use of an all-ones broadcast address implies this; an 299 * interface is specified by the broadcast address of an interface, 300 * or the destination address of a ptp interface. 301 */ 302 if (flags & IP_SENDONES) { 303 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst), 304 M_GETFIB(m)))) == NULL && 305 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 306 M_GETFIB(m)))) == NULL) { 307 IPSTAT_INC(ips_noroute); 308 error = ENETUNREACH; 309 goto bad; 310 } 311 have_ia_ref = 1; 312 ip->ip_dst.s_addr = INADDR_BROADCAST; 313 dst->sin_addr = ip->ip_dst; 314 ifp = ia->ia_ifp; 315 ip->ip_ttl = 1; 316 isbroadcast = 1; 317 } else if (flags & IP_ROUTETOIF) { 318 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 319 M_GETFIB(m)))) == NULL && 320 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0, 321 M_GETFIB(m)))) == NULL) { 322 IPSTAT_INC(ips_noroute); 323 error = ENETUNREACH; 324 goto bad; 325 } 326 have_ia_ref = 1; 327 ifp = ia->ia_ifp; 328 ip->ip_ttl = 1; 329 isbroadcast = in_broadcast(dst->sin_addr, ifp); 330 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 331 imo != NULL && imo->imo_multicast_ifp != NULL) { 332 /* 333 * Bypass the normal routing lookup for multicast 334 * packets if the interface is specified. 335 */ 336 ifp = imo->imo_multicast_ifp; 337 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 338 if (ia) 339 have_ia_ref = 1; 340 isbroadcast = 0; /* fool gcc */ 341 } else { 342 /* 343 * We want to do any cloning requested by the link layer, 344 * as this is probably required in all cases for correct 345 * operation (as it is for ARP). 346 */ 347 if (rte == NULL) { 348 #ifdef RADIX_MPATH 349 rtalloc_mpath_fib(ro, 350 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), 351 fibnum); 352 #else 353 in_rtalloc_ign(ro, 0, fibnum); 354 #endif 355 rte = ro->ro_rt; 356 } 357 if (rte == NULL || 358 (rte->rt_flags & RTF_UP) == 0 || 359 rte->rt_ifp == NULL || 360 !RT_LINK_IS_UP(rte->rt_ifp)) { 361 #ifdef IPSEC 362 /* 363 * There is no route for this packet, but it is 364 * possible that a matching SPD entry exists. 365 */ 366 no_route_but_check_spd = 1; 367 mtu = 0; /* Silence GCC warning. */ 368 goto sendit; 369 #endif 370 IPSTAT_INC(ips_noroute); 371 error = EHOSTUNREACH; 372 goto bad; 373 } 374 ia = ifatoia(rte->rt_ifa); 375 ifp = rte->rt_ifp; 376 counter_u64_add(rte->rt_pksent, 1); 377 if (rte->rt_flags & RTF_GATEWAY) 378 gw = (struct sockaddr_in *)rte->rt_gateway; 379 if (rte->rt_flags & RTF_HOST) 380 isbroadcast = (rte->rt_flags & RTF_BROADCAST); 381 else 382 isbroadcast = in_broadcast(gw->sin_addr, ifp); 383 } 384 385 /* 386 * Calculate MTU. If we have a route that is up, use that, 387 * otherwise use the interface's MTU. 388 */ 389 if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST))) 390 mtu = rte->rt_mtu; 391 else 392 mtu = ifp->if_mtu; 393 /* Catch a possible divide by zero later. */ 394 KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p", 395 __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp)); 396 397 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 398 m->m_flags |= M_MCAST; 399 /* 400 * IP destination address is multicast. Make sure "gw" 401 * still points to the address in "ro". (It may have been 402 * changed to point to a gateway address, above.) 403 */ 404 gw = dst; 405 /* 406 * See if the caller provided any multicast options 407 */ 408 if (imo != NULL) { 409 ip->ip_ttl = imo->imo_multicast_ttl; 410 if (imo->imo_multicast_vif != -1) 411 ip->ip_src.s_addr = 412 ip_mcast_src ? 413 ip_mcast_src(imo->imo_multicast_vif) : 414 INADDR_ANY; 415 } else 416 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 417 /* 418 * Confirm that the outgoing interface supports multicast. 419 */ 420 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 421 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 422 IPSTAT_INC(ips_noroute); 423 error = ENETUNREACH; 424 goto bad; 425 } 426 } 427 /* 428 * If source address not specified yet, use address 429 * of outgoing interface. 430 */ 431 if (ip->ip_src.s_addr == INADDR_ANY) { 432 /* Interface may have no addresses. */ 433 if (ia != NULL) 434 ip->ip_src = IA_SIN(ia)->sin_addr; 435 } 436 437 if ((imo == NULL && in_mcast_loop) || 438 (imo && imo->imo_multicast_loop)) { 439 /* 440 * Loop back multicast datagram if not expressly 441 * forbidden to do so, even if we are not a member 442 * of the group; ip_input() will filter it later, 443 * thus deferring a hash lookup and mutex acquisition 444 * at the expense of a cheap copy using m_copym(). 445 */ 446 ip_mloopback(ifp, m, dst, hlen); 447 } else { 448 /* 449 * If we are acting as a multicast router, perform 450 * multicast forwarding as if the packet had just 451 * arrived on the interface to which we are about 452 * to send. The multicast forwarding function 453 * recursively calls this function, using the 454 * IP_FORWARDING flag to prevent infinite recursion. 455 * 456 * Multicasts that are looped back by ip_mloopback(), 457 * above, will be forwarded by the ip_input() routine, 458 * if necessary. 459 */ 460 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) { 461 /* 462 * If rsvp daemon is not running, do not 463 * set ip_moptions. This ensures that the packet 464 * is multicast and not just sent down one link 465 * as prescribed by rsvpd. 466 */ 467 if (!V_rsvp_on) 468 imo = NULL; 469 if (ip_mforward && 470 ip_mforward(ip, ifp, m, imo) != 0) { 471 m_freem(m); 472 goto done; 473 } 474 } 475 } 476 477 /* 478 * Multicasts with a time-to-live of zero may be looped- 479 * back, above, but must not be transmitted on a network. 480 * Also, multicasts addressed to the loopback interface 481 * are not sent -- the above call to ip_mloopback() will 482 * loop back a copy. ip_input() will drop the copy if 483 * this host does not belong to the destination group on 484 * the loopback interface. 485 */ 486 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 487 m_freem(m); 488 goto done; 489 } 490 491 goto sendit; 492 } 493 494 /* 495 * If the source address is not specified yet, use the address 496 * of the outoing interface. 497 */ 498 if (ip->ip_src.s_addr == INADDR_ANY) { 499 /* Interface may have no addresses. */ 500 if (ia != NULL) { 501 ip->ip_src = IA_SIN(ia)->sin_addr; 502 } 503 } 504 505 /* 506 * Look for broadcast address and 507 * verify user is allowed to send 508 * such a packet. 509 */ 510 if (isbroadcast) { 511 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 512 error = EADDRNOTAVAIL; 513 goto bad; 514 } 515 if ((flags & IP_ALLOWBROADCAST) == 0) { 516 error = EACCES; 517 goto bad; 518 } 519 /* don't allow broadcast messages to be fragmented */ 520 if (ip_len > mtu) { 521 error = EMSGSIZE; 522 goto bad; 523 } 524 m->m_flags |= M_BCAST; 525 } else { 526 m->m_flags &= ~M_BCAST; 527 } 528 529 sendit: 530 #ifdef IPSEC 531 switch(ip_ipsec_output(&m, inp, &error)) { 532 case 1: 533 goto bad; 534 case -1: 535 goto done; 536 case 0: 537 default: 538 break; /* Continue with packet processing. */ 539 } 540 /* 541 * Check if there was a route for this packet; return error if not. 542 */ 543 if (no_route_but_check_spd) { 544 IPSTAT_INC(ips_noroute); 545 error = EHOSTUNREACH; 546 goto bad; 547 } 548 /* Update variables that are affected by ipsec4_output(). */ 549 ip = mtod(m, struct ip *); 550 hlen = ip->ip_hl << 2; 551 #endif /* IPSEC */ 552 553 /* Jump over all PFIL processing if hooks are not active. */ 554 if (PFIL_HOOKED(&V_inet_pfil_hook)) { 555 switch (ip_output_pfil(m, ifp, inp, dst, &fibnum, &error)) { 556 case 1: /* Finished */ 557 goto done; 558 559 case 0: /* Continue normally */ 560 ip = mtod(m, struct ip *); 561 break; 562 563 case -1: /* Need to try again */ 564 /* Reset everything for a new round */ 565 RO_RTFREE(ro); 566 if (have_ia_ref) 567 ifa_free(&ia->ia_ifa); 568 ro->ro_lle = NULL; 569 rte = NULL; 570 gw = dst; 571 ip = mtod(m, struct ip *); 572 goto again; 573 574 } 575 } 576 577 /* 127/8 must not appear on wire - RFC1122. */ 578 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 579 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 580 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 581 IPSTAT_INC(ips_badaddr); 582 error = EADDRNOTAVAIL; 583 goto bad; 584 } 585 } 586 587 m->m_pkthdr.csum_flags |= CSUM_IP; 588 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 589 in_delayed_cksum(m); 590 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 591 } 592 #ifdef SCTP 593 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 594 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 595 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 596 } 597 #endif 598 599 /* 600 * If small enough for interface, or the interface will take 601 * care of the fragmentation for us, we can just send directly. 602 */ 603 if (ip_len <= mtu || 604 (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 605 ip->ip_sum = 0; 606 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 607 ip->ip_sum = in_cksum(m, hlen); 608 m->m_pkthdr.csum_flags &= ~CSUM_IP; 609 } 610 611 /* 612 * Record statistics for this interface address. 613 * With CSUM_TSO the byte/packet count will be slightly 614 * incorrect because we count the IP+TCP headers only 615 * once instead of for every generated packet. 616 */ 617 if (!(flags & IP_FORWARDING) && ia) { 618 if (m->m_pkthdr.csum_flags & CSUM_TSO) 619 counter_u64_add(ia->ia_ifa.ifa_opackets, 620 m->m_pkthdr.len / m->m_pkthdr.tso_segsz); 621 else 622 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 623 624 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len); 625 } 626 #ifdef MBUF_STRESS_TEST 627 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 628 m = m_fragment(m, M_NOWAIT, mbuf_frag_size); 629 #endif 630 /* 631 * Reset layer specific mbuf flags 632 * to avoid confusing lower layers. 633 */ 634 m_clrprotoflags(m); 635 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 636 error = (*ifp->if_output)(ifp, m, 637 (const struct sockaddr *)gw, ro); 638 goto done; 639 } 640 641 /* Balk when DF bit is set or the interface didn't support TSO. */ 642 if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) { 643 error = EMSGSIZE; 644 IPSTAT_INC(ips_cantfrag); 645 goto bad; 646 } 647 648 /* 649 * Too large for interface; fragment if possible. If successful, 650 * on return, m will point to a list of packets to be sent. 651 */ 652 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist); 653 if (error) 654 goto bad; 655 for (; m; m = m0) { 656 m0 = m->m_nextpkt; 657 m->m_nextpkt = 0; 658 if (error == 0) { 659 /* Record statistics for this interface address. */ 660 if (ia != NULL) { 661 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 662 counter_u64_add(ia->ia_ifa.ifa_obytes, 663 m->m_pkthdr.len); 664 } 665 /* 666 * Reset layer specific mbuf flags 667 * to avoid confusing upper layers. 668 */ 669 m_clrprotoflags(m); 670 671 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 672 error = (*ifp->if_output)(ifp, m, 673 (const struct sockaddr *)gw, ro); 674 } else 675 m_freem(m); 676 } 677 678 if (error == 0) 679 IPSTAT_INC(ips_fragmented); 680 681 done: 682 if (ro == &iproute) 683 RO_RTFREE(ro); 684 else if (rte == NULL) 685 /* 686 * If the caller supplied a route but somehow the reference 687 * to it has been released need to prevent the caller 688 * calling RTFREE on it again. 689 */ 690 ro->ro_rt = NULL; 691 if (have_ia_ref) 692 ifa_free(&ia->ia_ifa); 693 return (error); 694 bad: 695 m_freem(m); 696 goto done; 697 } 698 699 /* 700 * Create a chain of fragments which fit the given mtu. m_frag points to the 701 * mbuf to be fragmented; on return it points to the chain with the fragments. 702 * Return 0 if no error. If error, m_frag may contain a partially built 703 * chain of fragments that should be freed by the caller. 704 * 705 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist) 706 */ 707 int 708 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 709 u_long if_hwassist_flags) 710 { 711 int error = 0; 712 int hlen = ip->ip_hl << 2; 713 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */ 714 int off; 715 struct mbuf *m0 = *m_frag; /* the original packet */ 716 int firstlen; 717 struct mbuf **mnext; 718 int nfrags; 719 uint16_t ip_len, ip_off; 720 721 ip_len = ntohs(ip->ip_len); 722 ip_off = ntohs(ip->ip_off); 723 724 if (ip_off & IP_DF) { /* Fragmentation not allowed */ 725 IPSTAT_INC(ips_cantfrag); 726 return EMSGSIZE; 727 } 728 729 /* 730 * Must be able to put at least 8 bytes per fragment. 731 */ 732 if (len < 8) 733 return EMSGSIZE; 734 735 /* 736 * If the interface will not calculate checksums on 737 * fragmented packets, then do it here. 738 */ 739 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 740 in_delayed_cksum(m0); 741 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 742 } 743 #ifdef SCTP 744 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) { 745 sctp_delayed_cksum(m0, hlen); 746 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 747 } 748 #endif 749 if (len > PAGE_SIZE) { 750 /* 751 * Fragment large datagrams such that each segment 752 * contains a multiple of PAGE_SIZE amount of data, 753 * plus headers. This enables a receiver to perform 754 * page-flipping zero-copy optimizations. 755 * 756 * XXX When does this help given that sender and receiver 757 * could have different page sizes, and also mtu could 758 * be less than the receiver's page size ? 759 */ 760 int newlen; 761 762 off = MIN(mtu, m0->m_pkthdr.len); 763 764 /* 765 * firstlen (off - hlen) must be aligned on an 766 * 8-byte boundary 767 */ 768 if (off < hlen) 769 goto smart_frag_failure; 770 off = ((off - hlen) & ~7) + hlen; 771 newlen = (~PAGE_MASK) & mtu; 772 if ((newlen + sizeof (struct ip)) > mtu) { 773 /* we failed, go back the default */ 774 smart_frag_failure: 775 newlen = len; 776 off = hlen + len; 777 } 778 len = newlen; 779 780 } else { 781 off = hlen + len; 782 } 783 784 firstlen = off - hlen; 785 mnext = &m0->m_nextpkt; /* pointer to next packet */ 786 787 /* 788 * Loop through length of segment after first fragment, 789 * make new header and copy data of each part and link onto chain. 790 * Here, m0 is the original packet, m is the fragment being created. 791 * The fragments are linked off the m_nextpkt of the original 792 * packet, which after processing serves as the first fragment. 793 */ 794 for (nfrags = 1; off < ip_len; off += len, nfrags++) { 795 struct ip *mhip; /* ip header on the fragment */ 796 struct mbuf *m; 797 int mhlen = sizeof (struct ip); 798 799 m = m_gethdr(M_NOWAIT, MT_DATA); 800 if (m == NULL) { 801 error = ENOBUFS; 802 IPSTAT_INC(ips_odropped); 803 goto done; 804 } 805 /* 806 * Make sure the complete packet header gets copied 807 * from the originating mbuf to the newly created 808 * mbuf. This also ensures that existing firewall 809 * classification(s), VLAN tags and so on get copied 810 * to the resulting fragmented packet(s): 811 */ 812 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) { 813 m_free(m); 814 error = ENOBUFS; 815 IPSTAT_INC(ips_odropped); 816 goto done; 817 } 818 /* 819 * In the first mbuf, leave room for the link header, then 820 * copy the original IP header including options. The payload 821 * goes into an additional mbuf chain returned by m_copym(). 822 */ 823 m->m_data += max_linkhdr; 824 mhip = mtod(m, struct ip *); 825 *mhip = *ip; 826 if (hlen > sizeof (struct ip)) { 827 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 828 mhip->ip_v = IPVERSION; 829 mhip->ip_hl = mhlen >> 2; 830 } 831 m->m_len = mhlen; 832 /* XXX do we need to add ip_off below ? */ 833 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 834 if (off + len >= ip_len) 835 len = ip_len - off; 836 else 837 mhip->ip_off |= IP_MF; 838 mhip->ip_len = htons((u_short)(len + mhlen)); 839 m->m_next = m_copym(m0, off, len, M_NOWAIT); 840 if (m->m_next == NULL) { /* copy failed */ 841 m_free(m); 842 error = ENOBUFS; /* ??? */ 843 IPSTAT_INC(ips_odropped); 844 goto done; 845 } 846 m->m_pkthdr.len = mhlen + len; 847 #ifdef MAC 848 mac_netinet_fragment(m0, m); 849 #endif 850 mhip->ip_off = htons(mhip->ip_off); 851 mhip->ip_sum = 0; 852 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 853 mhip->ip_sum = in_cksum(m, mhlen); 854 m->m_pkthdr.csum_flags &= ~CSUM_IP; 855 } 856 *mnext = m; 857 mnext = &m->m_nextpkt; 858 } 859 IPSTAT_ADD(ips_ofragments, nfrags); 860 861 /* 862 * Update first fragment by trimming what's been copied out 863 * and updating header. 864 */ 865 m_adj(m0, hlen + firstlen - ip_len); 866 m0->m_pkthdr.len = hlen + firstlen; 867 ip->ip_len = htons((u_short)m0->m_pkthdr.len); 868 ip->ip_off = htons(ip_off | IP_MF); 869 ip->ip_sum = 0; 870 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 871 ip->ip_sum = in_cksum(m0, hlen); 872 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 873 } 874 875 done: 876 *m_frag = m0; 877 return error; 878 } 879 880 void 881 in_delayed_cksum(struct mbuf *m) 882 { 883 struct ip *ip; 884 uint16_t csum, offset, ip_len; 885 886 ip = mtod(m, struct ip *); 887 offset = ip->ip_hl << 2 ; 888 ip_len = ntohs(ip->ip_len); 889 csum = in_cksum_skip(m, ip_len, offset); 890 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0) 891 csum = 0xffff; 892 offset += m->m_pkthdr.csum_data; /* checksum offset */ 893 894 /* find the mbuf in the chain where the checksum starts*/ 895 while ((m != NULL) && (offset >= m->m_len)) { 896 offset -= m->m_len; 897 m = m->m_next; 898 } 899 KASSERT(m != NULL, ("in_delayed_cksum: checksum outside mbuf chain.")); 900 KASSERT(offset + sizeof(u_short) <= m->m_len, ("in_delayed_cksum: checksum split between mbufs.")); 901 *(u_short *)(m->m_data + offset) = csum; 902 } 903 904 /* 905 * IP socket option processing. 906 */ 907 int 908 ip_ctloutput(struct socket *so, struct sockopt *sopt) 909 { 910 struct inpcb *inp = sotoinpcb(so); 911 int error, optval; 912 #ifdef RSS 913 uint32_t rss_bucket; 914 int retval; 915 #endif 916 917 error = optval = 0; 918 if (sopt->sopt_level != IPPROTO_IP) { 919 error = EINVAL; 920 921 if (sopt->sopt_level == SOL_SOCKET && 922 sopt->sopt_dir == SOPT_SET) { 923 switch (sopt->sopt_name) { 924 case SO_REUSEADDR: 925 INP_WLOCK(inp); 926 if ((so->so_options & SO_REUSEADDR) != 0) 927 inp->inp_flags2 |= INP_REUSEADDR; 928 else 929 inp->inp_flags2 &= ~INP_REUSEADDR; 930 INP_WUNLOCK(inp); 931 error = 0; 932 break; 933 case SO_REUSEPORT: 934 INP_WLOCK(inp); 935 if ((so->so_options & SO_REUSEPORT) != 0) 936 inp->inp_flags2 |= INP_REUSEPORT; 937 else 938 inp->inp_flags2 &= ~INP_REUSEPORT; 939 INP_WUNLOCK(inp); 940 error = 0; 941 break; 942 case SO_SETFIB: 943 INP_WLOCK(inp); 944 inp->inp_inc.inc_fibnum = so->so_fibnum; 945 INP_WUNLOCK(inp); 946 error = 0; 947 break; 948 default: 949 break; 950 } 951 } 952 return (error); 953 } 954 955 switch (sopt->sopt_dir) { 956 case SOPT_SET: 957 switch (sopt->sopt_name) { 958 case IP_OPTIONS: 959 #ifdef notyet 960 case IP_RETOPTS: 961 #endif 962 { 963 struct mbuf *m; 964 if (sopt->sopt_valsize > MLEN) { 965 error = EMSGSIZE; 966 break; 967 } 968 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA); 969 if (m == NULL) { 970 error = ENOBUFS; 971 break; 972 } 973 m->m_len = sopt->sopt_valsize; 974 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 975 m->m_len); 976 if (error) { 977 m_free(m); 978 break; 979 } 980 INP_WLOCK(inp); 981 error = ip_pcbopts(inp, sopt->sopt_name, m); 982 INP_WUNLOCK(inp); 983 return (error); 984 } 985 986 case IP_BINDANY: 987 if (sopt->sopt_td != NULL) { 988 error = priv_check(sopt->sopt_td, 989 PRIV_NETINET_BINDANY); 990 if (error) 991 break; 992 } 993 /* FALLTHROUGH */ 994 case IP_BINDMULTI: 995 #ifdef RSS 996 case IP_RSS_LISTEN_BUCKET: 997 #endif 998 case IP_TOS: 999 case IP_TTL: 1000 case IP_MINTTL: 1001 case IP_RECVOPTS: 1002 case IP_RECVRETOPTS: 1003 case IP_RECVDSTADDR: 1004 case IP_RECVTTL: 1005 case IP_RECVIF: 1006 case IP_ONESBCAST: 1007 case IP_DONTFRAG: 1008 case IP_RECVTOS: 1009 case IP_RECVFLOWID: 1010 #ifdef RSS 1011 case IP_RECVRSSBUCKETID: 1012 #endif 1013 error = sooptcopyin(sopt, &optval, sizeof optval, 1014 sizeof optval); 1015 if (error) 1016 break; 1017 1018 switch (sopt->sopt_name) { 1019 case IP_TOS: 1020 inp->inp_ip_tos = optval; 1021 break; 1022 1023 case IP_TTL: 1024 inp->inp_ip_ttl = optval; 1025 break; 1026 1027 case IP_MINTTL: 1028 if (optval >= 0 && optval <= MAXTTL) 1029 inp->inp_ip_minttl = optval; 1030 else 1031 error = EINVAL; 1032 break; 1033 1034 #define OPTSET(bit) do { \ 1035 INP_WLOCK(inp); \ 1036 if (optval) \ 1037 inp->inp_flags |= bit; \ 1038 else \ 1039 inp->inp_flags &= ~bit; \ 1040 INP_WUNLOCK(inp); \ 1041 } while (0) 1042 1043 #define OPTSET2(bit, val) do { \ 1044 INP_WLOCK(inp); \ 1045 if (val) \ 1046 inp->inp_flags2 |= bit; \ 1047 else \ 1048 inp->inp_flags2 &= ~bit; \ 1049 INP_WUNLOCK(inp); \ 1050 } while (0) 1051 1052 case IP_RECVOPTS: 1053 OPTSET(INP_RECVOPTS); 1054 break; 1055 1056 case IP_RECVRETOPTS: 1057 OPTSET(INP_RECVRETOPTS); 1058 break; 1059 1060 case IP_RECVDSTADDR: 1061 OPTSET(INP_RECVDSTADDR); 1062 break; 1063 1064 case IP_RECVTTL: 1065 OPTSET(INP_RECVTTL); 1066 break; 1067 1068 case IP_RECVIF: 1069 OPTSET(INP_RECVIF); 1070 break; 1071 1072 case IP_ONESBCAST: 1073 OPTSET(INP_ONESBCAST); 1074 break; 1075 case IP_DONTFRAG: 1076 OPTSET(INP_DONTFRAG); 1077 break; 1078 case IP_BINDANY: 1079 OPTSET(INP_BINDANY); 1080 break; 1081 case IP_RECVTOS: 1082 OPTSET(INP_RECVTOS); 1083 break; 1084 case IP_BINDMULTI: 1085 OPTSET2(INP_BINDMULTI, optval); 1086 break; 1087 case IP_RECVFLOWID: 1088 OPTSET2(INP_RECVFLOWID, optval); 1089 break; 1090 #ifdef RSS 1091 case IP_RSS_LISTEN_BUCKET: 1092 if ((optval >= 0) && 1093 (optval < rss_getnumbuckets())) { 1094 inp->inp_rss_listen_bucket = optval; 1095 OPTSET2(INP_RSS_BUCKET_SET, 1); 1096 } else { 1097 error = EINVAL; 1098 } 1099 break; 1100 case IP_RECVRSSBUCKETID: 1101 OPTSET2(INP_RECVRSSBUCKETID, optval); 1102 break; 1103 #endif 1104 } 1105 break; 1106 #undef OPTSET 1107 #undef OPTSET2 1108 1109 /* 1110 * Multicast socket options are processed by the in_mcast 1111 * module. 1112 */ 1113 case IP_MULTICAST_IF: 1114 case IP_MULTICAST_VIF: 1115 case IP_MULTICAST_TTL: 1116 case IP_MULTICAST_LOOP: 1117 case IP_ADD_MEMBERSHIP: 1118 case IP_DROP_MEMBERSHIP: 1119 case IP_ADD_SOURCE_MEMBERSHIP: 1120 case IP_DROP_SOURCE_MEMBERSHIP: 1121 case IP_BLOCK_SOURCE: 1122 case IP_UNBLOCK_SOURCE: 1123 case IP_MSFILTER: 1124 case MCAST_JOIN_GROUP: 1125 case MCAST_LEAVE_GROUP: 1126 case MCAST_JOIN_SOURCE_GROUP: 1127 case MCAST_LEAVE_SOURCE_GROUP: 1128 case MCAST_BLOCK_SOURCE: 1129 case MCAST_UNBLOCK_SOURCE: 1130 error = inp_setmoptions(inp, sopt); 1131 break; 1132 1133 case IP_PORTRANGE: 1134 error = sooptcopyin(sopt, &optval, sizeof optval, 1135 sizeof optval); 1136 if (error) 1137 break; 1138 1139 INP_WLOCK(inp); 1140 switch (optval) { 1141 case IP_PORTRANGE_DEFAULT: 1142 inp->inp_flags &= ~(INP_LOWPORT); 1143 inp->inp_flags &= ~(INP_HIGHPORT); 1144 break; 1145 1146 case IP_PORTRANGE_HIGH: 1147 inp->inp_flags &= ~(INP_LOWPORT); 1148 inp->inp_flags |= INP_HIGHPORT; 1149 break; 1150 1151 case IP_PORTRANGE_LOW: 1152 inp->inp_flags &= ~(INP_HIGHPORT); 1153 inp->inp_flags |= INP_LOWPORT; 1154 break; 1155 1156 default: 1157 error = EINVAL; 1158 break; 1159 } 1160 INP_WUNLOCK(inp); 1161 break; 1162 1163 #ifdef IPSEC 1164 case IP_IPSEC_POLICY: 1165 { 1166 caddr_t req; 1167 struct mbuf *m; 1168 1169 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1170 break; 1171 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1172 break; 1173 req = mtod(m, caddr_t); 1174 error = ipsec_set_policy(inp, sopt->sopt_name, req, 1175 m->m_len, (sopt->sopt_td != NULL) ? 1176 sopt->sopt_td->td_ucred : NULL); 1177 m_freem(m); 1178 break; 1179 } 1180 #endif /* IPSEC */ 1181 1182 default: 1183 error = ENOPROTOOPT; 1184 break; 1185 } 1186 break; 1187 1188 case SOPT_GET: 1189 switch (sopt->sopt_name) { 1190 case IP_OPTIONS: 1191 case IP_RETOPTS: 1192 if (inp->inp_options) 1193 error = sooptcopyout(sopt, 1194 mtod(inp->inp_options, 1195 char *), 1196 inp->inp_options->m_len); 1197 else 1198 sopt->sopt_valsize = 0; 1199 break; 1200 1201 case IP_TOS: 1202 case IP_TTL: 1203 case IP_MINTTL: 1204 case IP_RECVOPTS: 1205 case IP_RECVRETOPTS: 1206 case IP_RECVDSTADDR: 1207 case IP_RECVTTL: 1208 case IP_RECVIF: 1209 case IP_PORTRANGE: 1210 case IP_ONESBCAST: 1211 case IP_DONTFRAG: 1212 case IP_BINDANY: 1213 case IP_RECVTOS: 1214 case IP_BINDMULTI: 1215 case IP_FLOWID: 1216 case IP_FLOWTYPE: 1217 case IP_RECVFLOWID: 1218 #ifdef RSS 1219 case IP_RSSBUCKETID: 1220 case IP_RECVRSSBUCKETID: 1221 #endif 1222 switch (sopt->sopt_name) { 1223 1224 case IP_TOS: 1225 optval = inp->inp_ip_tos; 1226 break; 1227 1228 case IP_TTL: 1229 optval = inp->inp_ip_ttl; 1230 break; 1231 1232 case IP_MINTTL: 1233 optval = inp->inp_ip_minttl; 1234 break; 1235 1236 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1237 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0) 1238 1239 case IP_RECVOPTS: 1240 optval = OPTBIT(INP_RECVOPTS); 1241 break; 1242 1243 case IP_RECVRETOPTS: 1244 optval = OPTBIT(INP_RECVRETOPTS); 1245 break; 1246 1247 case IP_RECVDSTADDR: 1248 optval = OPTBIT(INP_RECVDSTADDR); 1249 break; 1250 1251 case IP_RECVTTL: 1252 optval = OPTBIT(INP_RECVTTL); 1253 break; 1254 1255 case IP_RECVIF: 1256 optval = OPTBIT(INP_RECVIF); 1257 break; 1258 1259 case IP_PORTRANGE: 1260 if (inp->inp_flags & INP_HIGHPORT) 1261 optval = IP_PORTRANGE_HIGH; 1262 else if (inp->inp_flags & INP_LOWPORT) 1263 optval = IP_PORTRANGE_LOW; 1264 else 1265 optval = 0; 1266 break; 1267 1268 case IP_ONESBCAST: 1269 optval = OPTBIT(INP_ONESBCAST); 1270 break; 1271 case IP_DONTFRAG: 1272 optval = OPTBIT(INP_DONTFRAG); 1273 break; 1274 case IP_BINDANY: 1275 optval = OPTBIT(INP_BINDANY); 1276 break; 1277 case IP_RECVTOS: 1278 optval = OPTBIT(INP_RECVTOS); 1279 break; 1280 case IP_FLOWID: 1281 optval = inp->inp_flowid; 1282 break; 1283 case IP_FLOWTYPE: 1284 optval = inp->inp_flowtype; 1285 break; 1286 case IP_RECVFLOWID: 1287 optval = OPTBIT2(INP_RECVFLOWID); 1288 break; 1289 #ifdef RSS 1290 case IP_RSSBUCKETID: 1291 retval = rss_hash2bucket(inp->inp_flowid, 1292 inp->inp_flowtype, 1293 &rss_bucket); 1294 if (retval == 0) 1295 optval = rss_bucket; 1296 else 1297 error = EINVAL; 1298 break; 1299 case IP_RECVRSSBUCKETID: 1300 optval = OPTBIT2(INP_RECVRSSBUCKETID); 1301 break; 1302 #endif 1303 case IP_BINDMULTI: 1304 optval = OPTBIT2(INP_BINDMULTI); 1305 break; 1306 } 1307 error = sooptcopyout(sopt, &optval, sizeof optval); 1308 break; 1309 1310 /* 1311 * Multicast socket options are processed by the in_mcast 1312 * module. 1313 */ 1314 case IP_MULTICAST_IF: 1315 case IP_MULTICAST_VIF: 1316 case IP_MULTICAST_TTL: 1317 case IP_MULTICAST_LOOP: 1318 case IP_MSFILTER: 1319 error = inp_getmoptions(inp, sopt); 1320 break; 1321 1322 #ifdef IPSEC 1323 case IP_IPSEC_POLICY: 1324 { 1325 struct mbuf *m = NULL; 1326 caddr_t req = NULL; 1327 size_t len = 0; 1328 1329 if (m != 0) { 1330 req = mtod(m, caddr_t); 1331 len = m->m_len; 1332 } 1333 error = ipsec_get_policy(sotoinpcb(so), req, len, &m); 1334 if (error == 0) 1335 error = soopt_mcopyout(sopt, m); /* XXX */ 1336 if (error == 0) 1337 m_freem(m); 1338 break; 1339 } 1340 #endif /* IPSEC */ 1341 1342 default: 1343 error = ENOPROTOOPT; 1344 break; 1345 } 1346 break; 1347 } 1348 return (error); 1349 } 1350 1351 /* 1352 * Routine called from ip_output() to loop back a copy of an IP multicast 1353 * packet to the input queue of a specified interface. Note that this 1354 * calls the output routine of the loopback "driver", but with an interface 1355 * pointer that might NOT be a loopback interface -- evil, but easier than 1356 * replicating that code here. 1357 */ 1358 static void 1359 ip_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in *dst, 1360 int hlen) 1361 { 1362 register struct ip *ip; 1363 struct mbuf *copym; 1364 1365 /* 1366 * Make a deep copy of the packet because we're going to 1367 * modify the pack in order to generate checksums. 1368 */ 1369 copym = m_dup(m, M_NOWAIT); 1370 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen)) 1371 copym = m_pullup(copym, hlen); 1372 if (copym != NULL) { 1373 /* If needed, compute the checksum and mark it as valid. */ 1374 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1375 in_delayed_cksum(copym); 1376 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1377 copym->m_pkthdr.csum_flags |= 1378 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1379 copym->m_pkthdr.csum_data = 0xffff; 1380 } 1381 /* 1382 * We don't bother to fragment if the IP length is greater 1383 * than the interface's MTU. Can this possibly matter? 1384 */ 1385 ip = mtod(copym, struct ip *); 1386 ip->ip_sum = 0; 1387 ip->ip_sum = in_cksum(copym, hlen); 1388 #if 1 /* XXX */ 1389 if (dst->sin_family != AF_INET) { 1390 printf("ip_mloopback: bad address family %d\n", 1391 dst->sin_family); 1392 dst->sin_family = AF_INET; 1393 } 1394 #endif 1395 if_simloop(ifp, copym, dst->sin_family, 0); 1396 } 1397 } 1398