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_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 #ifdef IPSEC 87 #include <netinet/ip_ipsec.h> 88 #include <netipsec/ipsec.h> 89 #endif /* IPSEC*/ 90 91 #include <machine/in_cksum.h> 92 93 #include <security/mac/mac_framework.h> 94 95 #ifdef MBUF_STRESS_TEST 96 static int mbuf_frag_size = 0; 97 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW, 98 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size"); 99 #endif 100 101 static void ip_mloopback(struct ifnet *, const struct mbuf *, int); 102 103 104 extern int in_mcast_loop; 105 extern struct protosw inetsw[]; 106 107 static inline int 108 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, struct inpcb *inp, 109 struct sockaddr_in *dst, int *fibnum, int *error) 110 { 111 struct m_tag *fwd_tag = NULL; 112 struct mbuf *m; 113 struct in_addr odst; 114 struct ip *ip; 115 116 m = *mp; 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, mp, ifp, PFIL_OUT, inp); 122 m = *mp; 123 if ((*error) != 0 || m == NULL) 124 return 1; /* Finished */ 125 126 ip = mtod(m, struct ip *); 127 128 /* See if destination IP address was changed by packet filter. */ 129 if (odst.s_addr != ip->ip_dst.s_addr) { 130 m->m_flags |= M_SKIP_FIREWALL; 131 /* If destination is now ourself drop to ip_input(). */ 132 if (in_localip(ip->ip_dst)) { 133 m->m_flags |= M_FASTFWD_OURS; 134 if (m->m_pkthdr.rcvif == NULL) 135 m->m_pkthdr.rcvif = V_loif; 136 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 137 m->m_pkthdr.csum_flags |= 138 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 139 m->m_pkthdr.csum_data = 0xffff; 140 } 141 m->m_pkthdr.csum_flags |= 142 CSUM_IP_CHECKED | CSUM_IP_VALID; 143 #ifdef SCTP 144 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 145 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 146 #endif 147 *error = netisr_queue(NETISR_IP, m); 148 return 1; /* Finished */ 149 } 150 151 bzero(dst, sizeof(*dst)); 152 dst->sin_family = AF_INET; 153 dst->sin_len = sizeof(*dst); 154 dst->sin_addr = ip->ip_dst; 155 156 return -1; /* Reloop */ 157 } 158 /* See if fib was changed by packet filter. */ 159 if ((*fibnum) != M_GETFIB(m)) { 160 m->m_flags |= M_SKIP_FIREWALL; 161 *fibnum = M_GETFIB(m); 162 return -1; /* Reloop for FIB change */ 163 } 164 165 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 166 if (m->m_flags & M_FASTFWD_OURS) { 167 if (m->m_pkthdr.rcvif == NULL) 168 m->m_pkthdr.rcvif = V_loif; 169 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 170 m->m_pkthdr.csum_flags |= 171 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 172 m->m_pkthdr.csum_data = 0xffff; 173 } 174 #ifdef SCTP 175 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 176 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 177 #endif 178 m->m_pkthdr.csum_flags |= 179 CSUM_IP_CHECKED | CSUM_IP_VALID; 180 181 *error = netisr_queue(NETISR_IP, m); 182 return 1; /* Finished */ 183 } 184 /* Or forward to some other address? */ 185 if ((m->m_flags & M_IP_NEXTHOP) && 186 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) { 187 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 188 m->m_flags |= M_SKIP_FIREWALL; 189 m->m_flags &= ~M_IP_NEXTHOP; 190 m_tag_delete(m, fwd_tag); 191 192 return -1; /* Reloop for CHANGE of dst */ 193 } 194 195 return 0; 196 } 197 198 /* 199 * IP output. The packet in mbuf chain m contains a skeletal IP 200 * header (with len, off, ttl, proto, tos, src, dst). 201 * The mbuf chain containing the packet will be freed. 202 * The mbuf opt, if present, will not be freed. 203 * If route ro is present and has ro_rt initialized, route lookup would be 204 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 205 * then result of route lookup is stored in ro->ro_rt. 206 * 207 * In the IP forwarding case, the packet will arrive with options already 208 * inserted, so must have a NULL opt pointer. 209 */ 210 int 211 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags, 212 struct ip_moptions *imo, struct inpcb *inp) 213 { 214 struct rm_priotracker in_ifa_tracker; 215 struct ip *ip; 216 struct ifnet *ifp = NULL; /* keep compiler happy */ 217 struct mbuf *m0; 218 int hlen = sizeof (struct ip); 219 int mtu; 220 int error = 0; 221 struct sockaddr_in *dst; 222 const struct sockaddr_in *gw; 223 struct in_ifaddr *ia; 224 int isbroadcast; 225 uint16_t ip_len, ip_off; 226 struct route iproute; 227 struct rtentry *rte; /* cache for ro->ro_rt */ 228 uint32_t fibnum; 229 int have_ia_ref; 230 #ifdef IPSEC 231 int no_route_but_check_spd = 0; 232 #endif 233 M_ASSERTPKTHDR(m); 234 235 if (inp != NULL) { 236 INP_LOCK_ASSERT(inp); 237 M_SETFIB(m, inp->inp_inc.inc_fibnum); 238 if ((flags & IP_NODEFAULTFLOWID) == 0) { 239 m->m_pkthdr.flowid = inp->inp_flowid; 240 M_HASHTYPE_SET(m, inp->inp_flowtype); 241 } 242 } 243 244 if (ro == NULL) { 245 ro = &iproute; 246 bzero(ro, sizeof (*ro)); 247 } else 248 ro->ro_flags |= RT_LLE_CACHE; 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 if (rte == NULL) { 286 bzero(dst, sizeof(*dst)); 287 dst->sin_family = AF_INET; 288 dst->sin_len = sizeof(*dst); 289 dst->sin_addr = ip->ip_dst; 290 } 291 again: 292 /* 293 * Validate route against routing table additions; 294 * a better/more specific route might have been added. 295 */ 296 if (inp) 297 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum); 298 /* 299 * If there is a cached route, 300 * check that it is to the same destination 301 * and is still up. If not, free it and try again. 302 * The address family should also be checked in case of sharing the 303 * cache with IPv6. 304 * Also check whether routing cache needs invalidation. 305 */ 306 rte = ro->ro_rt; 307 if (rte && ((rte->rt_flags & RTF_UP) == 0 || 308 rte->rt_ifp == NULL || 309 !RT_LINK_IS_UP(rte->rt_ifp) || 310 dst->sin_family != AF_INET || 311 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) { 312 RTFREE(rte); 313 rte = ro->ro_rt = (struct rtentry *)NULL; 314 if (ro->ro_lle) 315 LLE_FREE(ro->ro_lle); /* zeros ro_lle */ 316 ro->ro_lle = (struct llentry *)NULL; 317 } 318 ia = NULL; 319 have_ia_ref = 0; 320 /* 321 * If routing to interface only, short circuit routing lookup. 322 * The use of an all-ones broadcast address implies this; an 323 * interface is specified by the broadcast address of an interface, 324 * or the destination address of a ptp interface. 325 */ 326 if (flags & IP_SENDONES) { 327 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst), 328 M_GETFIB(m)))) == NULL && 329 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 330 M_GETFIB(m)))) == NULL) { 331 IPSTAT_INC(ips_noroute); 332 error = ENETUNREACH; 333 goto bad; 334 } 335 have_ia_ref = 1; 336 ip->ip_dst.s_addr = INADDR_BROADCAST; 337 dst->sin_addr = ip->ip_dst; 338 ifp = ia->ia_ifp; 339 ip->ip_ttl = 1; 340 isbroadcast = 1; 341 } else if (flags & IP_ROUTETOIF) { 342 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 343 M_GETFIB(m)))) == NULL && 344 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0, 345 M_GETFIB(m)))) == NULL) { 346 IPSTAT_INC(ips_noroute); 347 error = ENETUNREACH; 348 goto bad; 349 } 350 have_ia_ref = 1; 351 ifp = ia->ia_ifp; 352 ip->ip_ttl = 1; 353 isbroadcast = in_ifaddr_broadcast(dst->sin_addr, ia); 354 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 355 imo != NULL && imo->imo_multicast_ifp != NULL) { 356 /* 357 * Bypass the normal routing lookup for multicast 358 * packets if the interface is specified. 359 */ 360 ifp = imo->imo_multicast_ifp; 361 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 362 if (ia) 363 have_ia_ref = 1; 364 isbroadcast = 0; /* fool gcc */ 365 } else { 366 /* 367 * We want to do any cloning requested by the link layer, 368 * as this is probably required in all cases for correct 369 * operation (as it is for ARP). 370 */ 371 if (rte == NULL) { 372 #ifdef RADIX_MPATH 373 rtalloc_mpath_fib(ro, 374 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), 375 fibnum); 376 #else 377 in_rtalloc_ign(ro, 0, fibnum); 378 #endif 379 rte = ro->ro_rt; 380 } 381 if (rte == NULL || 382 (rte->rt_flags & RTF_UP) == 0 || 383 rte->rt_ifp == NULL || 384 !RT_LINK_IS_UP(rte->rt_ifp)) { 385 #ifdef IPSEC 386 /* 387 * There is no route for this packet, but it is 388 * possible that a matching SPD entry exists. 389 */ 390 no_route_but_check_spd = 1; 391 mtu = 0; /* Silence GCC warning. */ 392 goto sendit; 393 #endif 394 IPSTAT_INC(ips_noroute); 395 error = EHOSTUNREACH; 396 goto bad; 397 } 398 ia = ifatoia(rte->rt_ifa); 399 ifp = rte->rt_ifp; 400 counter_u64_add(rte->rt_pksent, 1); 401 rt_update_ro_flags(ro); 402 if (rte->rt_flags & RTF_GATEWAY) 403 gw = (struct sockaddr_in *)rte->rt_gateway; 404 if (rte->rt_flags & RTF_HOST) 405 isbroadcast = (rte->rt_flags & RTF_BROADCAST); 406 else 407 isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia); 408 } 409 410 /* 411 * Calculate MTU. If we have a route that is up, use that, 412 * otherwise use the interface's MTU. 413 */ 414 if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST))) 415 mtu = rte->rt_mtu; 416 else 417 mtu = ifp->if_mtu; 418 /* Catch a possible divide by zero later. */ 419 KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p", 420 __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp)); 421 422 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 423 m->m_flags |= M_MCAST; 424 /* 425 * IP destination address is multicast. Make sure "gw" 426 * still points to the address in "ro". (It may have been 427 * changed to point to a gateway address, above.) 428 */ 429 gw = dst; 430 /* 431 * See if the caller provided any multicast options 432 */ 433 if (imo != NULL) { 434 ip->ip_ttl = imo->imo_multicast_ttl; 435 if (imo->imo_multicast_vif != -1) 436 ip->ip_src.s_addr = 437 ip_mcast_src ? 438 ip_mcast_src(imo->imo_multicast_vif) : 439 INADDR_ANY; 440 } else 441 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 442 /* 443 * Confirm that the outgoing interface supports multicast. 444 */ 445 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 446 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 447 IPSTAT_INC(ips_noroute); 448 error = ENETUNREACH; 449 goto bad; 450 } 451 } 452 /* 453 * If source address not specified yet, use address 454 * of outgoing interface. 455 */ 456 if (ip->ip_src.s_addr == INADDR_ANY) { 457 /* Interface may have no addresses. */ 458 if (ia != NULL) 459 ip->ip_src = IA_SIN(ia)->sin_addr; 460 } 461 462 if ((imo == NULL && in_mcast_loop) || 463 (imo && imo->imo_multicast_loop)) { 464 /* 465 * Loop back multicast datagram if not expressly 466 * forbidden to do so, even if we are not a member 467 * of the group; ip_input() will filter it later, 468 * thus deferring a hash lookup and mutex acquisition 469 * at the expense of a cheap copy using m_copym(). 470 */ 471 ip_mloopback(ifp, m, hlen); 472 } else { 473 /* 474 * If we are acting as a multicast router, perform 475 * multicast forwarding as if the packet had just 476 * arrived on the interface to which we are about 477 * to send. The multicast forwarding function 478 * recursively calls this function, using the 479 * IP_FORWARDING flag to prevent infinite recursion. 480 * 481 * Multicasts that are looped back by ip_mloopback(), 482 * above, will be forwarded by the ip_input() routine, 483 * if necessary. 484 */ 485 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) { 486 /* 487 * If rsvp daemon is not running, do not 488 * set ip_moptions. This ensures that the packet 489 * is multicast and not just sent down one link 490 * as prescribed by rsvpd. 491 */ 492 if (!V_rsvp_on) 493 imo = NULL; 494 if (ip_mforward && 495 ip_mforward(ip, ifp, m, imo) != 0) { 496 m_freem(m); 497 goto done; 498 } 499 } 500 } 501 502 /* 503 * Multicasts with a time-to-live of zero may be looped- 504 * back, above, but must not be transmitted on a network. 505 * Also, multicasts addressed to the loopback interface 506 * are not sent -- the above call to ip_mloopback() will 507 * loop back a copy. ip_input() will drop the copy if 508 * this host does not belong to the destination group on 509 * the loopback interface. 510 */ 511 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 512 m_freem(m); 513 goto done; 514 } 515 516 goto sendit; 517 } 518 519 /* 520 * If the source address is not specified yet, use the address 521 * of the outoing interface. 522 */ 523 if (ip->ip_src.s_addr == INADDR_ANY) { 524 /* Interface may have no addresses. */ 525 if (ia != NULL) { 526 ip->ip_src = IA_SIN(ia)->sin_addr; 527 } 528 } 529 530 /* 531 * Look for broadcast address and 532 * verify user is allowed to send 533 * such a packet. 534 */ 535 if (isbroadcast) { 536 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 537 error = EADDRNOTAVAIL; 538 goto bad; 539 } 540 if ((flags & IP_ALLOWBROADCAST) == 0) { 541 error = EACCES; 542 goto bad; 543 } 544 /* don't allow broadcast messages to be fragmented */ 545 if (ip_len > mtu) { 546 error = EMSGSIZE; 547 goto bad; 548 } 549 m->m_flags |= M_BCAST; 550 } else { 551 m->m_flags &= ~M_BCAST; 552 } 553 554 sendit: 555 #ifdef IPSEC 556 switch(ip_ipsec_output(&m, inp, &error)) { 557 case 1: 558 goto bad; 559 case -1: 560 goto done; 561 case 0: 562 default: 563 break; /* Continue with packet processing. */ 564 } 565 /* 566 * Check if there was a route for this packet; return error if not. 567 */ 568 if (no_route_but_check_spd) { 569 IPSTAT_INC(ips_noroute); 570 error = EHOSTUNREACH; 571 goto bad; 572 } 573 /* Update variables that are affected by ipsec4_output(). */ 574 ip = mtod(m, struct ip *); 575 hlen = ip->ip_hl << 2; 576 #endif /* IPSEC */ 577 578 /* Jump over all PFIL processing if hooks are not active. */ 579 if (PFIL_HOOKED(&V_inet_pfil_hook)) { 580 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) { 581 case 1: /* Finished */ 582 goto done; 583 584 case 0: /* Continue normally */ 585 ip = mtod(m, struct ip *); 586 break; 587 588 case -1: /* Need to try again */ 589 /* Reset everything for a new round */ 590 RO_RTFREE(ro); 591 if (have_ia_ref) 592 ifa_free(&ia->ia_ifa); 593 ro->ro_prepend = NULL; 594 rte = NULL; 595 gw = dst; 596 ip = mtod(m, struct ip *); 597 goto again; 598 599 } 600 } 601 602 /* 127/8 must not appear on wire - RFC1122. */ 603 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 604 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 605 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 606 IPSTAT_INC(ips_badaddr); 607 error = EADDRNOTAVAIL; 608 goto bad; 609 } 610 } 611 612 m->m_pkthdr.csum_flags |= CSUM_IP; 613 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 614 in_delayed_cksum(m); 615 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 616 } 617 #ifdef SCTP 618 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 619 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 620 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 621 } 622 #endif 623 624 /* 625 * If small enough for interface, or the interface will take 626 * care of the fragmentation for us, we can just send directly. 627 */ 628 if (ip_len <= mtu || 629 (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 630 ip->ip_sum = 0; 631 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 632 ip->ip_sum = in_cksum(m, hlen); 633 m->m_pkthdr.csum_flags &= ~CSUM_IP; 634 } 635 636 /* 637 * Record statistics for this interface address. 638 * With CSUM_TSO the byte/packet count will be slightly 639 * incorrect because we count the IP+TCP headers only 640 * once instead of for every generated packet. 641 */ 642 if (!(flags & IP_FORWARDING) && ia) { 643 if (m->m_pkthdr.csum_flags & CSUM_TSO) 644 counter_u64_add(ia->ia_ifa.ifa_opackets, 645 m->m_pkthdr.len / m->m_pkthdr.tso_segsz); 646 else 647 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 648 649 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len); 650 } 651 #ifdef MBUF_STRESS_TEST 652 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 653 m = m_fragment(m, M_NOWAIT, mbuf_frag_size); 654 #endif 655 /* 656 * Reset layer specific mbuf flags 657 * to avoid confusing lower layers. 658 */ 659 m_clrprotoflags(m); 660 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 661 error = (*ifp->if_output)(ifp, m, 662 (const struct sockaddr *)gw, ro); 663 goto done; 664 } 665 666 /* Balk when DF bit is set or the interface didn't support TSO. */ 667 if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) { 668 error = EMSGSIZE; 669 IPSTAT_INC(ips_cantfrag); 670 goto bad; 671 } 672 673 /* 674 * Too large for interface; fragment if possible. If successful, 675 * on return, m will point to a list of packets to be sent. 676 */ 677 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist); 678 if (error) 679 goto bad; 680 for (; m; m = m0) { 681 m0 = m->m_nextpkt; 682 m->m_nextpkt = 0; 683 if (error == 0) { 684 /* Record statistics for this interface address. */ 685 if (ia != NULL) { 686 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 687 counter_u64_add(ia->ia_ifa.ifa_obytes, 688 m->m_pkthdr.len); 689 } 690 /* 691 * Reset layer specific mbuf flags 692 * to avoid confusing upper layers. 693 */ 694 m_clrprotoflags(m); 695 696 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 697 error = (*ifp->if_output)(ifp, m, 698 (const struct sockaddr *)gw, ro); 699 } else 700 m_freem(m); 701 } 702 703 if (error == 0) 704 IPSTAT_INC(ips_fragmented); 705 706 done: 707 if (ro == &iproute) 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); 719 bad: 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 */ 732 int 733 ip_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 */ 799 smart_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 } 899 900 done: 901 *m_frag = m0; 902 return error; 903 } 904 905 void 906 in_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 */ 932 int 933 ip_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 #ifdef IPSEC 1189 case IP_IPSEC_POLICY: 1190 { 1191 caddr_t req; 1192 struct mbuf *m; 1193 1194 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1195 break; 1196 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1197 break; 1198 req = mtod(m, caddr_t); 1199 error = ipsec_set_policy(inp, sopt->sopt_name, req, 1200 m->m_len, (sopt->sopt_td != NULL) ? 1201 sopt->sopt_td->td_ucred : NULL); 1202 m_freem(m); 1203 break; 1204 } 1205 #endif /* IPSEC */ 1206 1207 default: 1208 error = ENOPROTOOPT; 1209 break; 1210 } 1211 break; 1212 1213 case SOPT_GET: 1214 switch (sopt->sopt_name) { 1215 case IP_OPTIONS: 1216 case IP_RETOPTS: 1217 if (inp->inp_options) 1218 error = sooptcopyout(sopt, 1219 mtod(inp->inp_options, 1220 char *), 1221 inp->inp_options->m_len); 1222 else 1223 sopt->sopt_valsize = 0; 1224 break; 1225 1226 case IP_TOS: 1227 case IP_TTL: 1228 case IP_MINTTL: 1229 case IP_RECVOPTS: 1230 case IP_RECVRETOPTS: 1231 case IP_RECVDSTADDR: 1232 case IP_RECVTTL: 1233 case IP_RECVIF: 1234 case IP_PORTRANGE: 1235 case IP_ONESBCAST: 1236 case IP_DONTFRAG: 1237 case IP_BINDANY: 1238 case IP_RECVTOS: 1239 case IP_BINDMULTI: 1240 case IP_FLOWID: 1241 case IP_FLOWTYPE: 1242 case IP_RECVFLOWID: 1243 #ifdef RSS 1244 case IP_RSSBUCKETID: 1245 case IP_RECVRSSBUCKETID: 1246 #endif 1247 switch (sopt->sopt_name) { 1248 1249 case IP_TOS: 1250 optval = inp->inp_ip_tos; 1251 break; 1252 1253 case IP_TTL: 1254 optval = inp->inp_ip_ttl; 1255 break; 1256 1257 case IP_MINTTL: 1258 optval = inp->inp_ip_minttl; 1259 break; 1260 1261 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1262 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0) 1263 1264 case IP_RECVOPTS: 1265 optval = OPTBIT(INP_RECVOPTS); 1266 break; 1267 1268 case IP_RECVRETOPTS: 1269 optval = OPTBIT(INP_RECVRETOPTS); 1270 break; 1271 1272 case IP_RECVDSTADDR: 1273 optval = OPTBIT(INP_RECVDSTADDR); 1274 break; 1275 1276 case IP_RECVTTL: 1277 optval = OPTBIT(INP_RECVTTL); 1278 break; 1279 1280 case IP_RECVIF: 1281 optval = OPTBIT(INP_RECVIF); 1282 break; 1283 1284 case IP_PORTRANGE: 1285 if (inp->inp_flags & INP_HIGHPORT) 1286 optval = IP_PORTRANGE_HIGH; 1287 else if (inp->inp_flags & INP_LOWPORT) 1288 optval = IP_PORTRANGE_LOW; 1289 else 1290 optval = 0; 1291 break; 1292 1293 case IP_ONESBCAST: 1294 optval = OPTBIT(INP_ONESBCAST); 1295 break; 1296 case IP_DONTFRAG: 1297 optval = OPTBIT(INP_DONTFRAG); 1298 break; 1299 case IP_BINDANY: 1300 optval = OPTBIT(INP_BINDANY); 1301 break; 1302 case IP_RECVTOS: 1303 optval = OPTBIT(INP_RECVTOS); 1304 break; 1305 case IP_FLOWID: 1306 optval = inp->inp_flowid; 1307 break; 1308 case IP_FLOWTYPE: 1309 optval = inp->inp_flowtype; 1310 break; 1311 case IP_RECVFLOWID: 1312 optval = OPTBIT2(INP_RECVFLOWID); 1313 break; 1314 #ifdef RSS 1315 case IP_RSSBUCKETID: 1316 retval = rss_hash2bucket(inp->inp_flowid, 1317 inp->inp_flowtype, 1318 &rss_bucket); 1319 if (retval == 0) 1320 optval = rss_bucket; 1321 else 1322 error = EINVAL; 1323 break; 1324 case IP_RECVRSSBUCKETID: 1325 optval = OPTBIT2(INP_RECVRSSBUCKETID); 1326 break; 1327 #endif 1328 case IP_BINDMULTI: 1329 optval = OPTBIT2(INP_BINDMULTI); 1330 break; 1331 } 1332 error = sooptcopyout(sopt, &optval, sizeof optval); 1333 break; 1334 1335 /* 1336 * Multicast socket options are processed by the in_mcast 1337 * module. 1338 */ 1339 case IP_MULTICAST_IF: 1340 case IP_MULTICAST_VIF: 1341 case IP_MULTICAST_TTL: 1342 case IP_MULTICAST_LOOP: 1343 case IP_MSFILTER: 1344 error = inp_getmoptions(inp, sopt); 1345 break; 1346 1347 #ifdef IPSEC 1348 case IP_IPSEC_POLICY: 1349 { 1350 struct mbuf *m = NULL; 1351 caddr_t req = NULL; 1352 size_t len = 0; 1353 1354 if (m != NULL) { 1355 req = mtod(m, caddr_t); 1356 len = m->m_len; 1357 } 1358 error = ipsec_get_policy(sotoinpcb(so), req, len, &m); 1359 if (error == 0) 1360 error = soopt_mcopyout(sopt, m); /* XXX */ 1361 if (error == 0) 1362 m_freem(m); 1363 break; 1364 } 1365 #endif /* IPSEC */ 1366 1367 default: 1368 error = ENOPROTOOPT; 1369 break; 1370 } 1371 break; 1372 } 1373 return (error); 1374 } 1375 1376 /* 1377 * Routine called from ip_output() to loop back a copy of an IP multicast 1378 * packet to the input queue of a specified interface. Note that this 1379 * calls the output routine of the loopback "driver", but with an interface 1380 * pointer that might NOT be a loopback interface -- evil, but easier than 1381 * replicating that code here. 1382 */ 1383 static void 1384 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen) 1385 { 1386 struct ip *ip; 1387 struct mbuf *copym; 1388 1389 /* 1390 * Make a deep copy of the packet because we're going to 1391 * modify the pack in order to generate checksums. 1392 */ 1393 copym = m_dup(m, M_NOWAIT); 1394 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen)) 1395 copym = m_pullup(copym, hlen); 1396 if (copym != NULL) { 1397 /* If needed, compute the checksum and mark it as valid. */ 1398 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1399 in_delayed_cksum(copym); 1400 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1401 copym->m_pkthdr.csum_flags |= 1402 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1403 copym->m_pkthdr.csum_data = 0xffff; 1404 } 1405 /* 1406 * We don't bother to fragment if the IP length is greater 1407 * than the interface's MTU. Can this possibly matter? 1408 */ 1409 ip = mtod(copym, struct ip *); 1410 ip->ip_sum = 0; 1411 ip->ip_sum = in_cksum(copym, hlen); 1412 if_simloop(ifp, copym, AF_INET, 0); 1413 } 1414 } 1415