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