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/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/sdt.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/sysctl.h> 56 #include <sys/ucred.h> 57 58 #include <net/if.h> 59 #include <net/if_var.h> 60 #include <net/if_llatbl.h> 61 #include <net/netisr.h> 62 #include <net/pfil.h> 63 #include <net/route.h> 64 #include <net/flowtable.h> 65 #ifdef RADIX_MPATH 66 #include <net/radix_mpath.h> 67 #endif 68 #include <net/vnet.h> 69 70 #include <netinet/in.h> 71 #include <netinet/in_kdtrace.h> 72 #include <netinet/in_systm.h> 73 #include <netinet/ip.h> 74 #include <netinet/in_pcb.h> 75 #include <netinet/in_rss.h> 76 #include <netinet/in_var.h> 77 #include <netinet/ip_var.h> 78 #include <netinet/ip_options.h> 79 #ifdef SCTP 80 #include <netinet/sctp.h> 81 #include <netinet/sctp_crc32.h> 82 #endif 83 84 #ifdef IPSEC 85 #include <netinet/ip_ipsec.h> 86 #include <netipsec/ipsec.h> 87 #endif /* IPSEC*/ 88 89 #include <machine/in_cksum.h> 90 91 #include <security/mac/mac_framework.h> 92 93 VNET_DEFINE(u_short, ip_id); 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 102 (struct ifnet *, struct mbuf *, struct sockaddr_in *, int); 103 104 105 extern int in_mcast_loop; 106 extern struct protosw inetsw[]; 107 108 /* 109 * IP output. The packet in mbuf chain m contains a skeletal IP 110 * header (with len, off, ttl, proto, tos, src, dst). 111 * The mbuf chain containing the packet will be freed. 112 * The mbuf opt, if present, will not be freed. 113 * If route ro is present and has ro_rt initialized, route lookup would be 114 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 115 * then result of route lookup is stored in ro->ro_rt. 116 * 117 * In the IP forwarding case, the packet will arrive with options already 118 * inserted, so must have a NULL opt pointer. 119 */ 120 int 121 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags, 122 struct ip_moptions *imo, struct inpcb *inp) 123 { 124 struct ip *ip; 125 struct ifnet *ifp = NULL; /* keep compiler happy */ 126 struct mbuf *m0; 127 int hlen = sizeof (struct ip); 128 int mtu; 129 int error = 0; 130 struct sockaddr_in *dst; 131 const struct sockaddr_in *gw; 132 struct in_ifaddr *ia; 133 int isbroadcast; 134 uint16_t ip_len, ip_off; 135 struct route iproute; 136 struct rtentry *rte; /* cache for ro->ro_rt */ 137 struct in_addr odst; 138 struct m_tag *fwd_tag = NULL; 139 int have_ia_ref; 140 #ifdef IPSEC 141 int no_route_but_check_spd = 0; 142 #endif 143 M_ASSERTPKTHDR(m); 144 145 if (inp != NULL) { 146 INP_LOCK_ASSERT(inp); 147 M_SETFIB(m, inp->inp_inc.inc_fibnum); 148 if (((flags & IP_NODEFAULTFLOWID) == 0) && 149 inp->inp_flags & (INP_HW_FLOWID|INP_SW_FLOWID)) { 150 m->m_pkthdr.flowid = inp->inp_flowid; 151 M_HASHTYPE_SET(m, inp->inp_flowtype); 152 m->m_flags |= M_FLOWID; 153 } 154 } 155 156 if (ro == NULL) { 157 ro = &iproute; 158 bzero(ro, sizeof (*ro)); 159 } 160 161 #ifdef FLOWTABLE 162 if (ro->ro_rt == NULL) 163 (void )flowtable_lookup(AF_INET, m, ro); 164 #endif 165 166 if (opt) { 167 int len = 0; 168 m = ip_insertoptions(m, opt, &len); 169 if (len != 0) 170 hlen = len; /* ip->ip_hl is updated above */ 171 } 172 ip = mtod(m, struct ip *); 173 ip_len = ntohs(ip->ip_len); 174 ip_off = ntohs(ip->ip_off); 175 176 /* 177 * Fill in IP header. If we are not allowing fragmentation, 178 * then the ip_id field is meaningless, but we don't set it 179 * to zero. Doing so causes various problems when devices along 180 * the path (routers, load balancers, firewalls, etc.) illegally 181 * disable DF on our packet. Note that a 16-bit counter 182 * will wrap around in less than 10 seconds at 100 Mbit/s on a 183 * medium with MTU 1500. See Steven M. Bellovin, "A Technique 184 * for Counting NATted Hosts", Proc. IMW'02, available at 185 * <http://www.cs.columbia.edu/~smb/papers/fnat.pdf>. 186 */ 187 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 188 ip->ip_v = IPVERSION; 189 ip->ip_hl = hlen >> 2; 190 ip->ip_id = ip_newid(); 191 IPSTAT_INC(ips_localout); 192 } else { 193 /* Header already set, fetch hlen from there */ 194 hlen = ip->ip_hl << 2; 195 } 196 197 /* 198 * dst/gw handling: 199 * 200 * dst can be rewritten but always points to &ro->ro_dst. 201 * gw is readonly but can point either to dst OR rt_gateway, 202 * therefore we need restore gw if we're redoing lookup. 203 */ 204 gw = dst = (struct sockaddr_in *)&ro->ro_dst; 205 again: 206 ia = NULL; 207 have_ia_ref = 0; 208 /* 209 * If there is a cached route, check that it is to the same 210 * destination and is still up. If not, free it and try again. 211 * The address family should also be checked in case of sharing 212 * the cache with IPv6. 213 */ 214 rte = ro->ro_rt; 215 if (rte && ((rte->rt_flags & RTF_UP) == 0 || 216 rte->rt_ifp == NULL || 217 !RT_LINK_IS_UP(rte->rt_ifp) || 218 dst->sin_family != AF_INET || 219 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) { 220 RO_RTFREE(ro); 221 ro->ro_lle = NULL; 222 rte = NULL; 223 gw = dst; 224 } 225 if (rte == NULL && fwd_tag == NULL) { 226 bzero(dst, sizeof(*dst)); 227 dst->sin_family = AF_INET; 228 dst->sin_len = sizeof(*dst); 229 dst->sin_addr = ip->ip_dst; 230 } 231 /* 232 * If routing to interface only, short circuit routing lookup. 233 * The use of an all-ones broadcast address implies this; an 234 * interface is specified by the broadcast address of an interface, 235 * or the destination address of a ptp interface. 236 */ 237 if (flags & IP_SENDONES) { 238 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst), 239 M_GETFIB(m)))) == NULL && 240 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 241 M_GETFIB(m)))) == NULL) { 242 IPSTAT_INC(ips_noroute); 243 error = ENETUNREACH; 244 goto bad; 245 } 246 have_ia_ref = 1; 247 ip->ip_dst.s_addr = INADDR_BROADCAST; 248 dst->sin_addr = ip->ip_dst; 249 ifp = ia->ia_ifp; 250 ip->ip_ttl = 1; 251 isbroadcast = 1; 252 } else if (flags & IP_ROUTETOIF) { 253 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 254 M_GETFIB(m)))) == NULL && 255 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0, 256 M_GETFIB(m)))) == NULL) { 257 IPSTAT_INC(ips_noroute); 258 error = ENETUNREACH; 259 goto bad; 260 } 261 have_ia_ref = 1; 262 ifp = ia->ia_ifp; 263 ip->ip_ttl = 1; 264 isbroadcast = in_broadcast(dst->sin_addr, ifp); 265 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 266 imo != NULL && imo->imo_multicast_ifp != NULL) { 267 /* 268 * Bypass the normal routing lookup for multicast 269 * packets if the interface is specified. 270 */ 271 ifp = imo->imo_multicast_ifp; 272 IFP_TO_IA(ifp, ia); 273 if (ia) 274 have_ia_ref = 1; 275 isbroadcast = 0; /* fool gcc */ 276 } else { 277 /* 278 * We want to do any cloning requested by the link layer, 279 * as this is probably required in all cases for correct 280 * operation (as it is for ARP). 281 */ 282 if (rte == NULL) { 283 #ifdef RADIX_MPATH 284 rtalloc_mpath_fib(ro, 285 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), 286 inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m)); 287 #else 288 in_rtalloc_ign(ro, 0, 289 inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m)); 290 #endif 291 rte = ro->ro_rt; 292 } 293 if (rte == NULL || 294 rte->rt_ifp == NULL || 295 !RT_LINK_IS_UP(rte->rt_ifp)) { 296 #ifdef IPSEC 297 /* 298 * There is no route for this packet, but it is 299 * possible that a matching SPD entry exists. 300 */ 301 no_route_but_check_spd = 1; 302 mtu = 0; /* Silence GCC warning. */ 303 goto sendit; 304 #endif 305 IPSTAT_INC(ips_noroute); 306 error = EHOSTUNREACH; 307 goto bad; 308 } 309 ia = ifatoia(rte->rt_ifa); 310 ifp = rte->rt_ifp; 311 counter_u64_add(rte->rt_pksent, 1); 312 if (rte->rt_flags & RTF_GATEWAY) 313 gw = (struct sockaddr_in *)rte->rt_gateway; 314 if (rte->rt_flags & RTF_HOST) 315 isbroadcast = (rte->rt_flags & RTF_BROADCAST); 316 else 317 isbroadcast = in_broadcast(gw->sin_addr, ifp); 318 } 319 /* 320 * Calculate MTU. If we have a route that is up, use that, 321 * otherwise use the interface's MTU. 322 */ 323 if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST))) { 324 /* 325 * This case can happen if the user changed the MTU 326 * of an interface after enabling IP on it. Because 327 * most netifs don't keep track of routes pointing to 328 * them, there is no way for one to update all its 329 * routes when the MTU is changed. 330 */ 331 if (rte->rt_mtu > ifp->if_mtu) 332 rte->rt_mtu = ifp->if_mtu; 333 mtu = rte->rt_mtu; 334 } else { 335 mtu = ifp->if_mtu; 336 } 337 /* Catch a possible divide by zero later. */ 338 KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p", 339 __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp)); 340 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 341 m->m_flags |= M_MCAST; 342 /* 343 * IP destination address is multicast. Make sure "gw" 344 * still points to the address in "ro". (It may have been 345 * changed to point to a gateway address, above.) 346 */ 347 gw = dst; 348 /* 349 * See if the caller provided any multicast options 350 */ 351 if (imo != NULL) { 352 ip->ip_ttl = imo->imo_multicast_ttl; 353 if (imo->imo_multicast_vif != -1) 354 ip->ip_src.s_addr = 355 ip_mcast_src ? 356 ip_mcast_src(imo->imo_multicast_vif) : 357 INADDR_ANY; 358 } else 359 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 360 /* 361 * Confirm that the outgoing interface supports multicast. 362 */ 363 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 364 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 365 IPSTAT_INC(ips_noroute); 366 error = ENETUNREACH; 367 goto bad; 368 } 369 } 370 /* 371 * If source address not specified yet, use address 372 * of outgoing interface. 373 */ 374 if (ip->ip_src.s_addr == INADDR_ANY) { 375 /* Interface may have no addresses. */ 376 if (ia != NULL) 377 ip->ip_src = IA_SIN(ia)->sin_addr; 378 } 379 380 if ((imo == NULL && in_mcast_loop) || 381 (imo && imo->imo_multicast_loop)) { 382 /* 383 * Loop back multicast datagram if not expressly 384 * forbidden to do so, even if we are not a member 385 * of the group; ip_input() will filter it later, 386 * thus deferring a hash lookup and mutex acquisition 387 * at the expense of a cheap copy using m_copym(). 388 */ 389 ip_mloopback(ifp, m, dst, hlen); 390 } else { 391 /* 392 * If we are acting as a multicast router, perform 393 * multicast forwarding as if the packet had just 394 * arrived on the interface to which we are about 395 * to send. The multicast forwarding function 396 * recursively calls this function, using the 397 * IP_FORWARDING flag to prevent infinite recursion. 398 * 399 * Multicasts that are looped back by ip_mloopback(), 400 * above, will be forwarded by the ip_input() routine, 401 * if necessary. 402 */ 403 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) { 404 /* 405 * If rsvp daemon is not running, do not 406 * set ip_moptions. This ensures that the packet 407 * is multicast and not just sent down one link 408 * as prescribed by rsvpd. 409 */ 410 if (!V_rsvp_on) 411 imo = NULL; 412 if (ip_mforward && 413 ip_mforward(ip, ifp, m, imo) != 0) { 414 m_freem(m); 415 goto done; 416 } 417 } 418 } 419 420 /* 421 * Multicasts with a time-to-live of zero may be looped- 422 * back, above, but must not be transmitted on a network. 423 * Also, multicasts addressed to the loopback interface 424 * are not sent -- the above call to ip_mloopback() will 425 * loop back a copy. ip_input() will drop the copy if 426 * this host does not belong to the destination group on 427 * the loopback interface. 428 */ 429 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 430 m_freem(m); 431 goto done; 432 } 433 434 goto sendit; 435 } 436 437 /* 438 * If the source address is not specified yet, use the address 439 * of the outoing interface. 440 */ 441 if (ip->ip_src.s_addr == INADDR_ANY) { 442 /* Interface may have no addresses. */ 443 if (ia != NULL) { 444 ip->ip_src = IA_SIN(ia)->sin_addr; 445 } 446 } 447 448 /* 449 * Both in the SMP world, pre-emption world if_transmit() world, 450 * the following code doesn't really function as intended any further. 451 * 452 * + There can and will be multiple CPUs running this code path 453 * in parallel, and we do no lock holding when checking the 454 * queue depth; 455 * + And since other threads can be running concurrently, even if 456 * we do pass this check, another thread may queue some frames 457 * before this thread does and it will end up partially or fully 458 * failing to send anyway; 459 * + if_transmit() based drivers don't necessarily set ifq_len 460 * at all. 461 * 462 * This should be replaced with a method of pushing an entire list 463 * of fragment frames to the driver and have the driver decide 464 * whether it can queue or not queue the entire set. 465 */ 466 #if 0 467 /* 468 * Verify that we have any chance at all of being able to queue the 469 * packet or packet fragments, unless ALTQ is enabled on the given 470 * interface in which case packetdrop should be done by queueing. 471 */ 472 n = ip_len / mtu + 1; /* how many fragments ? */ 473 if ( 474 #ifdef ALTQ 475 (!ALTQ_IS_ENABLED(&ifp->if_snd)) && 476 #endif /* ALTQ */ 477 (ifp->if_snd.ifq_len + n) >= ifp->if_snd.ifq_maxlen ) { 478 error = ENOBUFS; 479 IPSTAT_INC(ips_odropped); 480 ifp->if_snd.ifq_drops += n; 481 goto bad; 482 } 483 #endif 484 485 /* 486 * Look for broadcast address and 487 * verify user is allowed to send 488 * such a packet. 489 */ 490 if (isbroadcast) { 491 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 492 error = EADDRNOTAVAIL; 493 goto bad; 494 } 495 if ((flags & IP_ALLOWBROADCAST) == 0) { 496 error = EACCES; 497 goto bad; 498 } 499 /* don't allow broadcast messages to be fragmented */ 500 if (ip_len > mtu) { 501 error = EMSGSIZE; 502 goto bad; 503 } 504 m->m_flags |= M_BCAST; 505 } else { 506 m->m_flags &= ~M_BCAST; 507 } 508 509 sendit: 510 #ifdef IPSEC 511 switch(ip_ipsec_output(&m, inp, &flags, &error)) { 512 case 1: 513 goto bad; 514 case -1: 515 goto done; 516 case 0: 517 default: 518 break; /* Continue with packet processing. */ 519 } 520 /* 521 * Check if there was a route for this packet; return error if not. 522 */ 523 if (no_route_but_check_spd) { 524 IPSTAT_INC(ips_noroute); 525 error = EHOSTUNREACH; 526 goto bad; 527 } 528 /* Update variables that are affected by ipsec4_output(). */ 529 ip = mtod(m, struct ip *); 530 hlen = ip->ip_hl << 2; 531 #endif /* IPSEC */ 532 533 /* Jump over all PFIL processing if hooks are not active. */ 534 if (!PFIL_HOOKED(&V_inet_pfil_hook)) 535 goto passout; 536 537 /* Run through list of hooks for output packets. */ 538 odst.s_addr = ip->ip_dst.s_addr; 539 error = pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_OUT, inp); 540 if (error != 0 || m == NULL) 541 goto done; 542 543 ip = mtod(m, struct ip *); 544 545 /* See if destination IP address was changed by packet filter. */ 546 if (odst.s_addr != ip->ip_dst.s_addr) { 547 m->m_flags |= M_SKIP_FIREWALL; 548 /* If destination is now ourself drop to ip_input(). */ 549 if (in_localip(ip->ip_dst)) { 550 m->m_flags |= M_FASTFWD_OURS; 551 if (m->m_pkthdr.rcvif == NULL) 552 m->m_pkthdr.rcvif = V_loif; 553 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 554 m->m_pkthdr.csum_flags |= 555 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 556 m->m_pkthdr.csum_data = 0xffff; 557 } 558 m->m_pkthdr.csum_flags |= 559 CSUM_IP_CHECKED | CSUM_IP_VALID; 560 #ifdef SCTP 561 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 562 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 563 #endif 564 error = netisr_queue(NETISR_IP, m); 565 goto done; 566 } else { 567 if (have_ia_ref) 568 ifa_free(&ia->ia_ifa); 569 goto again; /* Redo the routing table lookup. */ 570 } 571 } 572 573 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 574 if (m->m_flags & M_FASTFWD_OURS) { 575 if (m->m_pkthdr.rcvif == NULL) 576 m->m_pkthdr.rcvif = V_loif; 577 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 578 m->m_pkthdr.csum_flags |= 579 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 580 m->m_pkthdr.csum_data = 0xffff; 581 } 582 #ifdef SCTP 583 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 584 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 585 #endif 586 m->m_pkthdr.csum_flags |= 587 CSUM_IP_CHECKED | CSUM_IP_VALID; 588 589 error = netisr_queue(NETISR_IP, m); 590 goto done; 591 } 592 /* Or forward to some other address? */ 593 if ((m->m_flags & M_IP_NEXTHOP) && 594 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 595 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 596 m->m_flags |= M_SKIP_FIREWALL; 597 m->m_flags &= ~M_IP_NEXTHOP; 598 m_tag_delete(m, fwd_tag); 599 if (have_ia_ref) 600 ifa_free(&ia->ia_ifa); 601 goto again; 602 } 603 604 passout: 605 /* 127/8 must not appear on wire - RFC1122. */ 606 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 607 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 608 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 609 IPSTAT_INC(ips_badaddr); 610 error = EADDRNOTAVAIL; 611 goto bad; 612 } 613 } 614 615 m->m_pkthdr.csum_flags |= CSUM_IP; 616 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 617 in_delayed_cksum(m); 618 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 619 } 620 #ifdef SCTP 621 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 622 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 623 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 624 } 625 #endif 626 627 /* 628 * If small enough for interface, or the interface will take 629 * care of the fragmentation for us, we can just send directly. 630 */ 631 if (ip_len <= mtu || 632 (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 633 ip->ip_sum = 0; 634 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 635 ip->ip_sum = in_cksum(m, hlen); 636 m->m_pkthdr.csum_flags &= ~CSUM_IP; 637 } 638 639 /* 640 * Record statistics for this interface address. 641 * With CSUM_TSO the byte/packet count will be slightly 642 * incorrect because we count the IP+TCP headers only 643 * once instead of for every generated packet. 644 */ 645 if (!(flags & IP_FORWARDING) && ia) { 646 if (m->m_pkthdr.csum_flags & CSUM_TSO) 647 counter_u64_add(ia->ia_ifa.ifa_opackets, 648 m->m_pkthdr.len / m->m_pkthdr.tso_segsz); 649 else 650 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 651 652 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len); 653 } 654 #ifdef MBUF_STRESS_TEST 655 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 656 m = m_fragment(m, M_NOWAIT, mbuf_frag_size); 657 #endif 658 /* 659 * Reset layer specific mbuf flags 660 * to avoid confusing lower layers. 661 */ 662 m_clrprotoflags(m); 663 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 664 error = (*ifp->if_output)(ifp, m, 665 (const struct sockaddr *)gw, ro); 666 goto done; 667 } 668 669 /* Balk when DF bit is set or the interface didn't support TSO. */ 670 if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) { 671 error = EMSGSIZE; 672 IPSTAT_INC(ips_cantfrag); 673 goto bad; 674 } 675 676 /* 677 * Too large for interface; fragment if possible. If successful, 678 * on return, m will point to a list of packets to be sent. 679 */ 680 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist); 681 if (error) 682 goto bad; 683 for (; m; m = m0) { 684 m0 = m->m_nextpkt; 685 m->m_nextpkt = 0; 686 if (error == 0) { 687 /* Record statistics for this interface address. */ 688 if (ia != NULL) { 689 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 690 counter_u64_add(ia->ia_ifa.ifa_obytes, 691 m->m_pkthdr.len); 692 } 693 /* 694 * Reset layer specific mbuf flags 695 * to avoid confusing upper layers. 696 */ 697 m_clrprotoflags(m); 698 699 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 700 error = (*ifp->if_output)(ifp, m, 701 (const struct sockaddr *)gw, ro); 702 } else 703 m_freem(m); 704 } 705 706 if (error == 0) 707 IPSTAT_INC(ips_fragmented); 708 709 done: 710 if (ro == &iproute) 711 RO_RTFREE(ro); 712 if (have_ia_ref) 713 ifa_free(&ia->ia_ifa); 714 return (error); 715 bad: 716 m_freem(m); 717 goto done; 718 } 719 720 /* 721 * Create a chain of fragments which fit the given mtu. m_frag points to the 722 * mbuf to be fragmented; on return it points to the chain with the fragments. 723 * Return 0 if no error. If error, m_frag may contain a partially built 724 * chain of fragments that should be freed by the caller. 725 * 726 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist) 727 */ 728 int 729 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 730 u_long if_hwassist_flags) 731 { 732 int error = 0; 733 int hlen = ip->ip_hl << 2; 734 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */ 735 int off; 736 struct mbuf *m0 = *m_frag; /* the original packet */ 737 int firstlen; 738 struct mbuf **mnext; 739 int nfrags; 740 uint16_t ip_len, ip_off; 741 742 ip_len = ntohs(ip->ip_len); 743 ip_off = ntohs(ip->ip_off); 744 745 if (ip_off & IP_DF) { /* Fragmentation not allowed */ 746 IPSTAT_INC(ips_cantfrag); 747 return EMSGSIZE; 748 } 749 750 /* 751 * Must be able to put at least 8 bytes per fragment. 752 */ 753 if (len < 8) 754 return EMSGSIZE; 755 756 /* 757 * If the interface will not calculate checksums on 758 * fragmented packets, then do it here. 759 */ 760 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 761 in_delayed_cksum(m0); 762 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 763 } 764 #ifdef SCTP 765 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) { 766 sctp_delayed_cksum(m0, hlen); 767 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 768 } 769 #endif 770 if (len > PAGE_SIZE) { 771 /* 772 * Fragment large datagrams such that each segment 773 * contains a multiple of PAGE_SIZE amount of data, 774 * plus headers. This enables a receiver to perform 775 * page-flipping zero-copy optimizations. 776 * 777 * XXX When does this help given that sender and receiver 778 * could have different page sizes, and also mtu could 779 * be less than the receiver's page size ? 780 */ 781 int newlen; 782 struct mbuf *m; 783 784 for (m = m0, off = 0; m && (off+m->m_len) <= mtu; m = m->m_next) 785 off += m->m_len; 786 787 /* 788 * firstlen (off - hlen) must be aligned on an 789 * 8-byte boundary 790 */ 791 if (off < hlen) 792 goto smart_frag_failure; 793 off = ((off - hlen) & ~7) + hlen; 794 newlen = (~PAGE_MASK) & mtu; 795 if ((newlen + sizeof (struct ip)) > mtu) { 796 /* we failed, go back the default */ 797 smart_frag_failure: 798 newlen = len; 799 off = hlen + len; 800 } 801 len = newlen; 802 803 } else { 804 off = hlen + len; 805 } 806 807 firstlen = off - hlen; 808 mnext = &m0->m_nextpkt; /* pointer to next packet */ 809 810 /* 811 * Loop through length of segment after first fragment, 812 * make new header and copy data of each part and link onto chain. 813 * Here, m0 is the original packet, m is the fragment being created. 814 * The fragments are linked off the m_nextpkt of the original 815 * packet, which after processing serves as the first fragment. 816 */ 817 for (nfrags = 1; off < ip_len; off += len, nfrags++) { 818 struct ip *mhip; /* ip header on the fragment */ 819 struct mbuf *m; 820 int mhlen = sizeof (struct ip); 821 822 m = m_gethdr(M_NOWAIT, MT_DATA); 823 if (m == NULL) { 824 error = ENOBUFS; 825 IPSTAT_INC(ips_odropped); 826 goto done; 827 } 828 m->m_flags |= (m0->m_flags & M_MCAST); 829 /* 830 * In the first mbuf, leave room for the link header, then 831 * copy the original IP header including options. The payload 832 * goes into an additional mbuf chain returned by m_copym(). 833 */ 834 m->m_data += max_linkhdr; 835 mhip = mtod(m, struct ip *); 836 *mhip = *ip; 837 if (hlen > sizeof (struct ip)) { 838 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 839 mhip->ip_v = IPVERSION; 840 mhip->ip_hl = mhlen >> 2; 841 } 842 m->m_len = mhlen; 843 /* XXX do we need to add ip_off below ? */ 844 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 845 if (off + len >= ip_len) 846 len = ip_len - off; 847 else 848 mhip->ip_off |= IP_MF; 849 mhip->ip_len = htons((u_short)(len + mhlen)); 850 m->m_next = m_copym(m0, off, len, M_NOWAIT); 851 if (m->m_next == NULL) { /* copy failed */ 852 m_free(m); 853 error = ENOBUFS; /* ??? */ 854 IPSTAT_INC(ips_odropped); 855 goto done; 856 } 857 m->m_pkthdr.len = mhlen + len; 858 m->m_pkthdr.rcvif = NULL; 859 #ifdef MAC 860 mac_netinet_fragment(m0, m); 861 #endif 862 m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags; 863 mhip->ip_off = htons(mhip->ip_off); 864 mhip->ip_sum = 0; 865 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 866 mhip->ip_sum = in_cksum(m, mhlen); 867 m->m_pkthdr.csum_flags &= ~CSUM_IP; 868 } 869 *mnext = m; 870 mnext = &m->m_nextpkt; 871 } 872 IPSTAT_ADD(ips_ofragments, nfrags); 873 874 /* 875 * Update first fragment by trimming what's been copied out 876 * and updating header. 877 */ 878 m_adj(m0, hlen + firstlen - ip_len); 879 m0->m_pkthdr.len = hlen + firstlen; 880 ip->ip_len = htons((u_short)m0->m_pkthdr.len); 881 ip->ip_off = htons(ip_off | IP_MF); 882 ip->ip_sum = 0; 883 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 884 ip->ip_sum = in_cksum(m0, hlen); 885 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 886 } 887 888 done: 889 *m_frag = m0; 890 return error; 891 } 892 893 void 894 in_delayed_cksum(struct mbuf *m) 895 { 896 struct ip *ip; 897 uint16_t csum, offset, ip_len; 898 899 ip = mtod(m, struct ip *); 900 offset = ip->ip_hl << 2 ; 901 ip_len = ntohs(ip->ip_len); 902 csum = in_cksum_skip(m, ip_len, offset); 903 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0) 904 csum = 0xffff; 905 offset += m->m_pkthdr.csum_data; /* checksum offset */ 906 907 /* find the mbuf in the chain where the checksum starts*/ 908 while ((m != NULL) && (offset >= m->m_len)) { 909 offset -= m->m_len; 910 m = m->m_next; 911 } 912 KASSERT(m != NULL, ("in_delayed_cksum: checksum outside mbuf chain.")); 913 KASSERT(offset + sizeof(u_short) <= m->m_len, ("in_delayed_cksum: checksum split between mbufs.")); 914 *(u_short *)(m->m_data + offset) = csum; 915 } 916 917 /* 918 * IP socket option processing. 919 */ 920 int 921 ip_ctloutput(struct socket *so, struct sockopt *sopt) 922 { 923 struct inpcb *inp = sotoinpcb(so); 924 int error, optval; 925 #ifdef RSS 926 uint32_t rss_bucket; 927 int retval; 928 #endif 929 930 error = optval = 0; 931 if (sopt->sopt_level != IPPROTO_IP) { 932 error = EINVAL; 933 934 if (sopt->sopt_level == SOL_SOCKET && 935 sopt->sopt_dir == SOPT_SET) { 936 switch (sopt->sopt_name) { 937 case SO_REUSEADDR: 938 INP_WLOCK(inp); 939 if ((so->so_options & SO_REUSEADDR) != 0) 940 inp->inp_flags2 |= INP_REUSEADDR; 941 else 942 inp->inp_flags2 &= ~INP_REUSEADDR; 943 INP_WUNLOCK(inp); 944 error = 0; 945 break; 946 case SO_REUSEPORT: 947 INP_WLOCK(inp); 948 if ((so->so_options & SO_REUSEPORT) != 0) 949 inp->inp_flags2 |= INP_REUSEPORT; 950 else 951 inp->inp_flags2 &= ~INP_REUSEPORT; 952 INP_WUNLOCK(inp); 953 error = 0; 954 break; 955 case SO_SETFIB: 956 INP_WLOCK(inp); 957 inp->inp_inc.inc_fibnum = so->so_fibnum; 958 INP_WUNLOCK(inp); 959 error = 0; 960 break; 961 default: 962 break; 963 } 964 } 965 return (error); 966 } 967 968 switch (sopt->sopt_dir) { 969 case SOPT_SET: 970 switch (sopt->sopt_name) { 971 case IP_OPTIONS: 972 #ifdef notyet 973 case IP_RETOPTS: 974 #endif 975 { 976 struct mbuf *m; 977 if (sopt->sopt_valsize > MLEN) { 978 error = EMSGSIZE; 979 break; 980 } 981 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA); 982 if (m == NULL) { 983 error = ENOBUFS; 984 break; 985 } 986 m->m_len = sopt->sopt_valsize; 987 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 988 m->m_len); 989 if (error) { 990 m_free(m); 991 break; 992 } 993 INP_WLOCK(inp); 994 error = ip_pcbopts(inp, sopt->sopt_name, m); 995 INP_WUNLOCK(inp); 996 return (error); 997 } 998 999 case IP_BINDANY: 1000 if (sopt->sopt_td != NULL) { 1001 error = priv_check(sopt->sopt_td, 1002 PRIV_NETINET_BINDANY); 1003 if (error) 1004 break; 1005 } 1006 /* FALLTHROUGH */ 1007 case IP_BINDMULTI: 1008 #ifdef RSS 1009 case IP_RSS_LISTEN_BUCKET: 1010 #endif 1011 case IP_TOS: 1012 case IP_TTL: 1013 case IP_MINTTL: 1014 case IP_RECVOPTS: 1015 case IP_RECVRETOPTS: 1016 case IP_RECVDSTADDR: 1017 case IP_RECVTTL: 1018 case IP_RECVIF: 1019 case IP_FAITH: 1020 case IP_ONESBCAST: 1021 case IP_DONTFRAG: 1022 case IP_RECVTOS: 1023 case IP_RECVFLOWID: 1024 #ifdef RSS 1025 case IP_RECVRSSBUCKETID: 1026 #endif 1027 error = sooptcopyin(sopt, &optval, sizeof optval, 1028 sizeof optval); 1029 if (error) 1030 break; 1031 1032 switch (sopt->sopt_name) { 1033 case IP_TOS: 1034 inp->inp_ip_tos = optval; 1035 break; 1036 1037 case IP_TTL: 1038 inp->inp_ip_ttl = optval; 1039 break; 1040 1041 case IP_MINTTL: 1042 if (optval >= 0 && optval <= MAXTTL) 1043 inp->inp_ip_minttl = optval; 1044 else 1045 error = EINVAL; 1046 break; 1047 1048 #define OPTSET(bit) do { \ 1049 INP_WLOCK(inp); \ 1050 if (optval) \ 1051 inp->inp_flags |= bit; \ 1052 else \ 1053 inp->inp_flags &= ~bit; \ 1054 INP_WUNLOCK(inp); \ 1055 } while (0) 1056 1057 #define OPTSET2(bit, val) do { \ 1058 INP_WLOCK(inp); \ 1059 if (val) \ 1060 inp->inp_flags2 |= bit; \ 1061 else \ 1062 inp->inp_flags2 &= ~bit; \ 1063 INP_WUNLOCK(inp); \ 1064 } while (0) 1065 1066 case IP_RECVOPTS: 1067 OPTSET(INP_RECVOPTS); 1068 break; 1069 1070 case IP_RECVRETOPTS: 1071 OPTSET(INP_RECVRETOPTS); 1072 break; 1073 1074 case IP_RECVDSTADDR: 1075 OPTSET(INP_RECVDSTADDR); 1076 break; 1077 1078 case IP_RECVTTL: 1079 OPTSET(INP_RECVTTL); 1080 break; 1081 1082 case IP_RECVIF: 1083 OPTSET(INP_RECVIF); 1084 break; 1085 1086 case IP_FAITH: 1087 OPTSET(INP_FAITH); 1088 break; 1089 1090 case IP_ONESBCAST: 1091 OPTSET(INP_ONESBCAST); 1092 break; 1093 case IP_DONTFRAG: 1094 OPTSET(INP_DONTFRAG); 1095 break; 1096 case IP_BINDANY: 1097 OPTSET(INP_BINDANY); 1098 break; 1099 case IP_RECVTOS: 1100 OPTSET(INP_RECVTOS); 1101 break; 1102 case IP_BINDMULTI: 1103 OPTSET2(INP_BINDMULTI, optval); 1104 break; 1105 case IP_RECVFLOWID: 1106 OPTSET2(INP_RECVFLOWID, optval); 1107 break; 1108 #ifdef RSS 1109 case IP_RSS_LISTEN_BUCKET: 1110 if ((optval >= 0) && 1111 (optval < rss_getnumbuckets())) { 1112 inp->inp_rss_listen_bucket = optval; 1113 OPTSET2(INP_RSS_BUCKET_SET, 1); 1114 } else { 1115 error = EINVAL; 1116 } 1117 break; 1118 case IP_RECVRSSBUCKETID: 1119 OPTSET2(INP_RECVRSSBUCKETID, optval); 1120 break; 1121 #endif 1122 } 1123 break; 1124 #undef OPTSET 1125 #undef OPTSET2 1126 1127 /* 1128 * Multicast socket options are processed by the in_mcast 1129 * module. 1130 */ 1131 case IP_MULTICAST_IF: 1132 case IP_MULTICAST_VIF: 1133 case IP_MULTICAST_TTL: 1134 case IP_MULTICAST_LOOP: 1135 case IP_ADD_MEMBERSHIP: 1136 case IP_DROP_MEMBERSHIP: 1137 case IP_ADD_SOURCE_MEMBERSHIP: 1138 case IP_DROP_SOURCE_MEMBERSHIP: 1139 case IP_BLOCK_SOURCE: 1140 case IP_UNBLOCK_SOURCE: 1141 case IP_MSFILTER: 1142 case MCAST_JOIN_GROUP: 1143 case MCAST_LEAVE_GROUP: 1144 case MCAST_JOIN_SOURCE_GROUP: 1145 case MCAST_LEAVE_SOURCE_GROUP: 1146 case MCAST_BLOCK_SOURCE: 1147 case MCAST_UNBLOCK_SOURCE: 1148 error = inp_setmoptions(inp, sopt); 1149 break; 1150 1151 case IP_PORTRANGE: 1152 error = sooptcopyin(sopt, &optval, sizeof optval, 1153 sizeof optval); 1154 if (error) 1155 break; 1156 1157 INP_WLOCK(inp); 1158 switch (optval) { 1159 case IP_PORTRANGE_DEFAULT: 1160 inp->inp_flags &= ~(INP_LOWPORT); 1161 inp->inp_flags &= ~(INP_HIGHPORT); 1162 break; 1163 1164 case IP_PORTRANGE_HIGH: 1165 inp->inp_flags &= ~(INP_LOWPORT); 1166 inp->inp_flags |= INP_HIGHPORT; 1167 break; 1168 1169 case IP_PORTRANGE_LOW: 1170 inp->inp_flags &= ~(INP_HIGHPORT); 1171 inp->inp_flags |= INP_LOWPORT; 1172 break; 1173 1174 default: 1175 error = EINVAL; 1176 break; 1177 } 1178 INP_WUNLOCK(inp); 1179 break; 1180 1181 #ifdef IPSEC 1182 case IP_IPSEC_POLICY: 1183 { 1184 caddr_t req; 1185 struct mbuf *m; 1186 1187 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1188 break; 1189 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1190 break; 1191 req = mtod(m, caddr_t); 1192 error = ipsec_set_policy(inp, sopt->sopt_name, req, 1193 m->m_len, (sopt->sopt_td != NULL) ? 1194 sopt->sopt_td->td_ucred : NULL); 1195 m_freem(m); 1196 break; 1197 } 1198 #endif /* IPSEC */ 1199 1200 default: 1201 error = ENOPROTOOPT; 1202 break; 1203 } 1204 break; 1205 1206 case SOPT_GET: 1207 switch (sopt->sopt_name) { 1208 case IP_OPTIONS: 1209 case IP_RETOPTS: 1210 if (inp->inp_options) 1211 error = sooptcopyout(sopt, 1212 mtod(inp->inp_options, 1213 char *), 1214 inp->inp_options->m_len); 1215 else 1216 sopt->sopt_valsize = 0; 1217 break; 1218 1219 case IP_TOS: 1220 case IP_TTL: 1221 case IP_MINTTL: 1222 case IP_RECVOPTS: 1223 case IP_RECVRETOPTS: 1224 case IP_RECVDSTADDR: 1225 case IP_RECVTTL: 1226 case IP_RECVIF: 1227 case IP_PORTRANGE: 1228 case IP_FAITH: 1229 case IP_ONESBCAST: 1230 case IP_DONTFRAG: 1231 case IP_BINDANY: 1232 case IP_RECVTOS: 1233 case IP_BINDMULTI: 1234 case IP_FLOWID: 1235 case IP_FLOWTYPE: 1236 case IP_RECVFLOWID: 1237 #ifdef RSS 1238 case IP_RSSBUCKETID: 1239 case IP_RECVRSSBUCKETID: 1240 #endif 1241 switch (sopt->sopt_name) { 1242 1243 case IP_TOS: 1244 optval = inp->inp_ip_tos; 1245 break; 1246 1247 case IP_TTL: 1248 optval = inp->inp_ip_ttl; 1249 break; 1250 1251 case IP_MINTTL: 1252 optval = inp->inp_ip_minttl; 1253 break; 1254 1255 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1256 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0) 1257 1258 case IP_RECVOPTS: 1259 optval = OPTBIT(INP_RECVOPTS); 1260 break; 1261 1262 case IP_RECVRETOPTS: 1263 optval = OPTBIT(INP_RECVRETOPTS); 1264 break; 1265 1266 case IP_RECVDSTADDR: 1267 optval = OPTBIT(INP_RECVDSTADDR); 1268 break; 1269 1270 case IP_RECVTTL: 1271 optval = OPTBIT(INP_RECVTTL); 1272 break; 1273 1274 case IP_RECVIF: 1275 optval = OPTBIT(INP_RECVIF); 1276 break; 1277 1278 case IP_PORTRANGE: 1279 if (inp->inp_flags & INP_HIGHPORT) 1280 optval = IP_PORTRANGE_HIGH; 1281 else if (inp->inp_flags & INP_LOWPORT) 1282 optval = IP_PORTRANGE_LOW; 1283 else 1284 optval = 0; 1285 break; 1286 1287 case IP_FAITH: 1288 optval = OPTBIT(INP_FAITH); 1289 break; 1290 1291 case IP_ONESBCAST: 1292 optval = OPTBIT(INP_ONESBCAST); 1293 break; 1294 case IP_DONTFRAG: 1295 optval = OPTBIT(INP_DONTFRAG); 1296 break; 1297 case IP_BINDANY: 1298 optval = OPTBIT(INP_BINDANY); 1299 break; 1300 case IP_RECVTOS: 1301 optval = OPTBIT(INP_RECVTOS); 1302 break; 1303 case IP_FLOWID: 1304 optval = inp->inp_flowid; 1305 break; 1306 case IP_FLOWTYPE: 1307 optval = inp->inp_flowtype; 1308 break; 1309 case IP_RECVFLOWID: 1310 optval = OPTBIT2(INP_RECVFLOWID); 1311 break; 1312 #ifdef RSS 1313 case IP_RSSBUCKETID: 1314 retval = rss_hash2bucket(inp->inp_flowid, 1315 inp->inp_flowtype, 1316 &rss_bucket); 1317 if (retval == 0) 1318 optval = rss_bucket; 1319 else 1320 error = EINVAL; 1321 break; 1322 case IP_RECVRSSBUCKETID: 1323 optval = OPTBIT2(INP_RECVRSSBUCKETID); 1324 break; 1325 #endif 1326 case IP_BINDMULTI: 1327 optval = OPTBIT2(INP_BINDMULTI); 1328 break; 1329 } 1330 error = sooptcopyout(sopt, &optval, sizeof optval); 1331 break; 1332 1333 /* 1334 * Multicast socket options are processed by the in_mcast 1335 * module. 1336 */ 1337 case IP_MULTICAST_IF: 1338 case IP_MULTICAST_VIF: 1339 case IP_MULTICAST_TTL: 1340 case IP_MULTICAST_LOOP: 1341 case IP_MSFILTER: 1342 error = inp_getmoptions(inp, sopt); 1343 break; 1344 1345 #ifdef IPSEC 1346 case IP_IPSEC_POLICY: 1347 { 1348 struct mbuf *m = NULL; 1349 caddr_t req = NULL; 1350 size_t len = 0; 1351 1352 if (m != 0) { 1353 req = mtod(m, caddr_t); 1354 len = m->m_len; 1355 } 1356 error = ipsec_get_policy(sotoinpcb(so), req, len, &m); 1357 if (error == 0) 1358 error = soopt_mcopyout(sopt, m); /* XXX */ 1359 if (error == 0) 1360 m_freem(m); 1361 break; 1362 } 1363 #endif /* IPSEC */ 1364 1365 default: 1366 error = ENOPROTOOPT; 1367 break; 1368 } 1369 break; 1370 } 1371 return (error); 1372 } 1373 1374 /* 1375 * Routine called from ip_output() to loop back a copy of an IP multicast 1376 * packet to the input queue of a specified interface. Note that this 1377 * calls the output routine of the loopback "driver", but with an interface 1378 * pointer that might NOT be a loopback interface -- evil, but easier than 1379 * replicating that code here. 1380 */ 1381 static void 1382 ip_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in *dst, 1383 int hlen) 1384 { 1385 register struct ip *ip; 1386 struct mbuf *copym; 1387 1388 /* 1389 * Make a deep copy of the packet because we're going to 1390 * modify the pack in order to generate checksums. 1391 */ 1392 copym = m_dup(m, M_NOWAIT); 1393 if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen)) 1394 copym = m_pullup(copym, hlen); 1395 if (copym != NULL) { 1396 /* If needed, compute the checksum and mark it as valid. */ 1397 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1398 in_delayed_cksum(copym); 1399 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1400 copym->m_pkthdr.csum_flags |= 1401 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1402 copym->m_pkthdr.csum_data = 0xffff; 1403 } 1404 /* 1405 * We don't bother to fragment if the IP length is greater 1406 * than the interface's MTU. Can this possibly matter? 1407 */ 1408 ip = mtod(copym, struct ip *); 1409 ip->ip_sum = 0; 1410 ip->ip_sum = in_cksum(copym, hlen); 1411 #if 1 /* XXX */ 1412 if (dst->sin_family != AF_INET) { 1413 printf("ip_mloopback: bad address family %d\n", 1414 dst->sin_family); 1415 dst->sin_family = AF_INET; 1416 } 1417 #endif 1418 if_simloop(ifp, copym, dst->sin_family, 0); 1419 } 1420 } 1421