1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1988, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_inet.h" 38 #include "opt_ratelimit.h" 39 #include "opt_ipsec.h" 40 #include "opt_mbuf_stress_test.h" 41 #include "opt_mpath.h" 42 #include "opt_route.h" 43 #include "opt_sctp.h" 44 #include "opt_rss.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/lock.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/priv.h> 53 #include <sys/proc.h> 54 #include <sys/protosw.h> 55 #include <sys/rmlock.h> 56 #include <sys/sdt.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/sysctl.h> 60 #include <sys/ucred.h> 61 62 #include <net/if.h> 63 #include <net/if_var.h> 64 #include <net/if_llatbl.h> 65 #include <net/netisr.h> 66 #include <net/pfil.h> 67 #include <net/route.h> 68 #ifdef RADIX_MPATH 69 #include <net/radix_mpath.h> 70 #endif 71 #include <net/rss_config.h> 72 #include <net/vnet.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_kdtrace.h> 76 #include <netinet/in_systm.h> 77 #include <netinet/ip.h> 78 #include <netinet/in_pcb.h> 79 #include <netinet/in_rss.h> 80 #include <netinet/in_var.h> 81 #include <netinet/ip_var.h> 82 #include <netinet/ip_options.h> 83 #ifdef SCTP 84 #include <netinet/sctp.h> 85 #include <netinet/sctp_crc32.h> 86 #endif 87 88 #include <netipsec/ipsec_support.h> 89 90 #include <machine/in_cksum.h> 91 92 #include <security/mac/mac_framework.h> 93 94 #ifdef MBUF_STRESS_TEST 95 static int mbuf_frag_size = 0; 96 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW, 97 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size"); 98 #endif 99 100 static void ip_mloopback(struct ifnet *, const struct mbuf *, int); 101 102 103 extern int in_mcast_loop; 104 extern struct protosw inetsw[]; 105 106 static inline int 107 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, struct inpcb *inp, 108 struct sockaddr_in *dst, int *fibnum, int *error) 109 { 110 struct m_tag *fwd_tag = NULL; 111 struct mbuf *m; 112 struct in_addr odst; 113 struct ip *ip; 114 115 m = *mp; 116 ip = mtod(m, struct ip *); 117 118 /* Run through list of hooks for output packets. */ 119 odst.s_addr = ip->ip_dst.s_addr; 120 *error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, PFIL_OUT, inp); 121 m = *mp; 122 if ((*error) != 0 || m == NULL) 123 return 1; /* Finished */ 124 125 ip = mtod(m, struct ip *); 126 127 /* See if destination IP address was changed by packet filter. */ 128 if (odst.s_addr != ip->ip_dst.s_addr) { 129 m->m_flags |= M_SKIP_FIREWALL; 130 /* If destination is now ourself drop to ip_input(). */ 131 if (in_localip(ip->ip_dst)) { 132 m->m_flags |= M_FASTFWD_OURS; 133 if (m->m_pkthdr.rcvif == NULL) 134 m->m_pkthdr.rcvif = V_loif; 135 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 136 m->m_pkthdr.csum_flags |= 137 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 138 m->m_pkthdr.csum_data = 0xffff; 139 } 140 m->m_pkthdr.csum_flags |= 141 CSUM_IP_CHECKED | CSUM_IP_VALID; 142 #ifdef SCTP 143 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 144 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 145 #endif 146 *error = netisr_queue(NETISR_IP, m); 147 return 1; /* Finished */ 148 } 149 150 bzero(dst, sizeof(*dst)); 151 dst->sin_family = AF_INET; 152 dst->sin_len = sizeof(*dst); 153 dst->sin_addr = ip->ip_dst; 154 155 return -1; /* Reloop */ 156 } 157 /* See if fib was changed by packet filter. */ 158 if ((*fibnum) != M_GETFIB(m)) { 159 m->m_flags |= M_SKIP_FIREWALL; 160 *fibnum = M_GETFIB(m); 161 return -1; /* Reloop for FIB change */ 162 } 163 164 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 165 if (m->m_flags & M_FASTFWD_OURS) { 166 if (m->m_pkthdr.rcvif == NULL) 167 m->m_pkthdr.rcvif = V_loif; 168 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 169 m->m_pkthdr.csum_flags |= 170 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 171 m->m_pkthdr.csum_data = 0xffff; 172 } 173 #ifdef SCTP 174 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 175 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 176 #endif 177 m->m_pkthdr.csum_flags |= 178 CSUM_IP_CHECKED | CSUM_IP_VALID; 179 180 *error = netisr_queue(NETISR_IP, m); 181 return 1; /* Finished */ 182 } 183 /* Or forward to some other address? */ 184 if ((m->m_flags & M_IP_NEXTHOP) && 185 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) { 186 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 187 m->m_flags |= M_SKIP_FIREWALL; 188 m->m_flags &= ~M_IP_NEXTHOP; 189 m_tag_delete(m, fwd_tag); 190 191 return -1; /* Reloop for CHANGE of dst */ 192 } 193 194 return 0; 195 } 196 197 /* 198 * IP output. The packet in mbuf chain m contains a skeletal IP 199 * header (with len, off, ttl, proto, tos, src, dst). 200 * The mbuf chain containing the packet will be freed. 201 * The mbuf opt, if present, will not be freed. 202 * If route ro is present and has ro_rt initialized, route lookup would be 203 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 204 * then result of route lookup is stored in ro->ro_rt. 205 * 206 * In the IP forwarding case, the packet will arrive with options already 207 * inserted, so must have a NULL opt pointer. 208 */ 209 int 210 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags, 211 struct ip_moptions *imo, struct inpcb *inp) 212 { 213 struct rm_priotracker in_ifa_tracker; 214 struct ip *ip; 215 struct ifnet *ifp = NULL; /* keep compiler happy */ 216 struct mbuf *m0; 217 int hlen = sizeof (struct ip); 218 int mtu; 219 int error = 0; 220 struct sockaddr_in *dst; 221 const struct sockaddr_in *gw; 222 struct in_ifaddr *ia; 223 int isbroadcast; 224 uint16_t ip_len, ip_off; 225 struct route iproute; 226 struct rtentry *rte; /* cache for ro->ro_rt */ 227 uint32_t fibnum; 228 int have_ia_ref; 229 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 230 int no_route_but_check_spd = 0; 231 #endif 232 M_ASSERTPKTHDR(m); 233 234 if (inp != NULL) { 235 INP_LOCK_ASSERT(inp); 236 M_SETFIB(m, inp->inp_inc.inc_fibnum); 237 if ((flags & IP_NODEFAULTFLOWID) == 0) { 238 m->m_pkthdr.flowid = inp->inp_flowid; 239 M_HASHTYPE_SET(m, inp->inp_flowtype); 240 } 241 } 242 243 if (ro == NULL) { 244 ro = &iproute; 245 bzero(ro, sizeof (*ro)); 246 } 247 248 if (opt) { 249 int len = 0; 250 m = ip_insertoptions(m, opt, &len); 251 if (len != 0) 252 hlen = len; /* ip->ip_hl is updated above */ 253 } 254 ip = mtod(m, struct ip *); 255 ip_len = ntohs(ip->ip_len); 256 ip_off = ntohs(ip->ip_off); 257 258 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 259 ip->ip_v = IPVERSION; 260 ip->ip_hl = hlen >> 2; 261 ip_fillid(ip); 262 IPSTAT_INC(ips_localout); 263 } else { 264 /* Header already set, fetch hlen from there */ 265 hlen = ip->ip_hl << 2; 266 } 267 268 /* 269 * dst/gw handling: 270 * 271 * dst can be rewritten but always points to &ro->ro_dst. 272 * gw is readonly but can point either to dst OR rt_gateway, 273 * therefore we need restore gw if we're redoing lookup. 274 */ 275 gw = dst = (struct sockaddr_in *)&ro->ro_dst; 276 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 277 rte = ro->ro_rt; 278 if (rte == NULL) { 279 bzero(dst, sizeof(*dst)); 280 dst->sin_family = AF_INET; 281 dst->sin_len = sizeof(*dst); 282 dst->sin_addr = ip->ip_dst; 283 } 284 again: 285 /* 286 * Validate route against routing table additions; 287 * a better/more specific route might have been added. 288 */ 289 if (inp) 290 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum); 291 /* 292 * If there is a cached route, 293 * check that it is to the same destination 294 * and is still up. If not, free it and try again. 295 * The address family should also be checked in case of sharing the 296 * cache with IPv6. 297 * Also check whether routing cache needs invalidation. 298 */ 299 rte = ro->ro_rt; 300 if (rte && ((rte->rt_flags & RTF_UP) == 0 || 301 rte->rt_ifp == NULL || 302 !RT_LINK_IS_UP(rte->rt_ifp) || 303 dst->sin_family != AF_INET || 304 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) { 305 RTFREE(rte); 306 rte = ro->ro_rt = (struct rtentry *)NULL; 307 if (ro->ro_lle) 308 LLE_FREE(ro->ro_lle); /* zeros ro_lle */ 309 ro->ro_lle = (struct llentry *)NULL; 310 } 311 ia = NULL; 312 have_ia_ref = 0; 313 /* 314 * If routing to interface only, short circuit routing lookup. 315 * The use of an all-ones broadcast address implies this; an 316 * interface is specified by the broadcast address of an interface, 317 * or the destination address of a ptp interface. 318 */ 319 if (flags & IP_SENDONES) { 320 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst), 321 M_GETFIB(m)))) == NULL && 322 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 323 M_GETFIB(m)))) == NULL) { 324 IPSTAT_INC(ips_noroute); 325 error = ENETUNREACH; 326 goto bad; 327 } 328 have_ia_ref = 1; 329 ip->ip_dst.s_addr = INADDR_BROADCAST; 330 dst->sin_addr = ip->ip_dst; 331 ifp = ia->ia_ifp; 332 ip->ip_ttl = 1; 333 isbroadcast = 1; 334 } else if (flags & IP_ROUTETOIF) { 335 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 336 M_GETFIB(m)))) == NULL && 337 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0, 338 M_GETFIB(m)))) == NULL) { 339 IPSTAT_INC(ips_noroute); 340 error = ENETUNREACH; 341 goto bad; 342 } 343 have_ia_ref = 1; 344 ifp = ia->ia_ifp; 345 ip->ip_ttl = 1; 346 isbroadcast = ifp->if_flags & IFF_BROADCAST ? 347 in_ifaddr_broadcast(dst->sin_addr, ia) : 0; 348 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 349 imo != NULL && imo->imo_multicast_ifp != NULL) { 350 /* 351 * Bypass the normal routing lookup for multicast 352 * packets if the interface is specified. 353 */ 354 ifp = imo->imo_multicast_ifp; 355 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 356 if (ia) 357 have_ia_ref = 1; 358 isbroadcast = 0; /* fool gcc */ 359 } else { 360 /* 361 * We want to do any cloning requested by the link layer, 362 * as this is probably required in all cases for correct 363 * operation (as it is for ARP). 364 */ 365 if (rte == NULL) { 366 #ifdef RADIX_MPATH 367 rtalloc_mpath_fib(ro, 368 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), 369 fibnum); 370 #else 371 in_rtalloc_ign(ro, 0, fibnum); 372 #endif 373 rte = ro->ro_rt; 374 } 375 if (rte == NULL || 376 (rte->rt_flags & RTF_UP) == 0 || 377 rte->rt_ifp == NULL || 378 !RT_LINK_IS_UP(rte->rt_ifp)) { 379 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 380 /* 381 * There is no route for this packet, but it is 382 * possible that a matching SPD entry exists. 383 */ 384 no_route_but_check_spd = 1; 385 mtu = 0; /* Silence GCC warning. */ 386 goto sendit; 387 #endif 388 IPSTAT_INC(ips_noroute); 389 error = EHOSTUNREACH; 390 goto bad; 391 } 392 ia = ifatoia(rte->rt_ifa); 393 ifp = rte->rt_ifp; 394 counter_u64_add(rte->rt_pksent, 1); 395 rt_update_ro_flags(ro); 396 if (rte->rt_flags & RTF_GATEWAY) 397 gw = (struct sockaddr_in *)rte->rt_gateway; 398 if (rte->rt_flags & RTF_HOST) 399 isbroadcast = (rte->rt_flags & RTF_BROADCAST); 400 else if (ifp->if_flags & IFF_BROADCAST) 401 isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia); 402 else 403 isbroadcast = 0; 404 } 405 406 /* 407 * Calculate MTU. If we have a route that is up, use that, 408 * otherwise use the interface's MTU. 409 */ 410 if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST))) 411 mtu = rte->rt_mtu; 412 else 413 mtu = ifp->if_mtu; 414 /* Catch a possible divide by zero later. */ 415 KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p", 416 __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp)); 417 418 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 419 m->m_flags |= M_MCAST; 420 /* 421 * IP destination address is multicast. Make sure "gw" 422 * still points to the address in "ro". (It may have been 423 * changed to point to a gateway address, above.) 424 */ 425 gw = dst; 426 /* 427 * See if the caller provided any multicast options 428 */ 429 if (imo != NULL) { 430 ip->ip_ttl = imo->imo_multicast_ttl; 431 if (imo->imo_multicast_vif != -1) 432 ip->ip_src.s_addr = 433 ip_mcast_src ? 434 ip_mcast_src(imo->imo_multicast_vif) : 435 INADDR_ANY; 436 } else 437 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 438 /* 439 * Confirm that the outgoing interface supports multicast. 440 */ 441 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 442 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 443 IPSTAT_INC(ips_noroute); 444 error = ENETUNREACH; 445 goto bad; 446 } 447 } 448 /* 449 * If source address not specified yet, use address 450 * of outgoing interface. 451 */ 452 if (ip->ip_src.s_addr == INADDR_ANY) { 453 /* Interface may have no addresses. */ 454 if (ia != NULL) 455 ip->ip_src = IA_SIN(ia)->sin_addr; 456 } 457 458 if ((imo == NULL && in_mcast_loop) || 459 (imo && imo->imo_multicast_loop)) { 460 /* 461 * Loop back multicast datagram if not expressly 462 * forbidden to do so, even if we are not a member 463 * of the group; ip_input() will filter it later, 464 * thus deferring a hash lookup and mutex acquisition 465 * at the expense of a cheap copy using m_copym(). 466 */ 467 ip_mloopback(ifp, m, hlen); 468 } else { 469 /* 470 * If we are acting as a multicast router, perform 471 * multicast forwarding as if the packet had just 472 * arrived on the interface to which we are about 473 * to send. The multicast forwarding function 474 * recursively calls this function, using the 475 * IP_FORWARDING flag to prevent infinite recursion. 476 * 477 * Multicasts that are looped back by ip_mloopback(), 478 * above, will be forwarded by the ip_input() routine, 479 * if necessary. 480 */ 481 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) { 482 /* 483 * If rsvp daemon is not running, do not 484 * set ip_moptions. This ensures that the packet 485 * is multicast and not just sent down one link 486 * as prescribed by rsvpd. 487 */ 488 if (!V_rsvp_on) 489 imo = NULL; 490 if (ip_mforward && 491 ip_mforward(ip, ifp, m, imo) != 0) { 492 m_freem(m); 493 goto done; 494 } 495 } 496 } 497 498 /* 499 * Multicasts with a time-to-live of zero may be looped- 500 * back, above, but must not be transmitted on a network. 501 * Also, multicasts addressed to the loopback interface 502 * are not sent -- the above call to ip_mloopback() will 503 * loop back a copy. ip_input() will drop the copy if 504 * this host does not belong to the destination group on 505 * the loopback interface. 506 */ 507 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 508 m_freem(m); 509 goto done; 510 } 511 512 goto sendit; 513 } 514 515 /* 516 * If the source address is not specified yet, use the address 517 * of the outoing interface. 518 */ 519 if (ip->ip_src.s_addr == INADDR_ANY) { 520 /* Interface may have no addresses. */ 521 if (ia != NULL) { 522 ip->ip_src = IA_SIN(ia)->sin_addr; 523 } 524 } 525 526 /* 527 * Look for broadcast address and 528 * verify user is allowed to send 529 * such a packet. 530 */ 531 if (isbroadcast) { 532 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 533 error = EADDRNOTAVAIL; 534 goto bad; 535 } 536 if ((flags & IP_ALLOWBROADCAST) == 0) { 537 error = EACCES; 538 goto bad; 539 } 540 /* don't allow broadcast messages to be fragmented */ 541 if (ip_len > mtu) { 542 error = EMSGSIZE; 543 goto bad; 544 } 545 m->m_flags |= M_BCAST; 546 } else { 547 m->m_flags &= ~M_BCAST; 548 } 549 550 sendit: 551 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 552 if (IPSEC_ENABLED(ipv4)) { 553 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) { 554 if (error == EINPROGRESS) 555 error = 0; 556 goto done; 557 } 558 } 559 /* 560 * Check if there was a route for this packet; return error if not. 561 */ 562 if (no_route_but_check_spd) { 563 IPSTAT_INC(ips_noroute); 564 error = EHOSTUNREACH; 565 goto bad; 566 } 567 /* Update variables that are affected by ipsec4_output(). */ 568 ip = mtod(m, struct ip *); 569 hlen = ip->ip_hl << 2; 570 #endif /* IPSEC */ 571 572 /* Jump over all PFIL processing if hooks are not active. */ 573 if (PFIL_HOOKED(&V_inet_pfil_hook)) { 574 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) { 575 case 1: /* Finished */ 576 goto done; 577 578 case 0: /* Continue normally */ 579 ip = mtod(m, struct ip *); 580 break; 581 582 case -1: /* Need to try again */ 583 /* Reset everything for a new round */ 584 RO_RTFREE(ro); 585 if (have_ia_ref) 586 ifa_free(&ia->ia_ifa); 587 ro->ro_prepend = NULL; 588 rte = NULL; 589 gw = dst; 590 ip = mtod(m, struct ip *); 591 goto again; 592 593 } 594 } 595 596 /* 127/8 must not appear on wire - RFC1122. */ 597 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || 598 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { 599 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 600 IPSTAT_INC(ips_badaddr); 601 error = EADDRNOTAVAIL; 602 goto bad; 603 } 604 } 605 606 m->m_pkthdr.csum_flags |= CSUM_IP; 607 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 608 in_delayed_cksum(m); 609 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 610 } 611 #ifdef SCTP 612 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 613 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 614 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 615 } 616 #endif 617 618 /* 619 * If small enough for interface, or the interface will take 620 * care of the fragmentation for us, we can just send directly. 621 */ 622 if (ip_len <= mtu || 623 (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 624 ip->ip_sum = 0; 625 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 626 ip->ip_sum = in_cksum(m, hlen); 627 m->m_pkthdr.csum_flags &= ~CSUM_IP; 628 } 629 630 /* 631 * Record statistics for this interface address. 632 * With CSUM_TSO the byte/packet count will be slightly 633 * incorrect because we count the IP+TCP headers only 634 * once instead of for every generated packet. 635 */ 636 if (!(flags & IP_FORWARDING) && ia) { 637 if (m->m_pkthdr.csum_flags & CSUM_TSO) 638 counter_u64_add(ia->ia_ifa.ifa_opackets, 639 m->m_pkthdr.len / m->m_pkthdr.tso_segsz); 640 else 641 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 642 643 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len); 644 } 645 #ifdef MBUF_STRESS_TEST 646 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 647 m = m_fragment(m, M_NOWAIT, mbuf_frag_size); 648 #endif 649 /* 650 * Reset layer specific mbuf flags 651 * to avoid confusing lower layers. 652 */ 653 m_clrprotoflags(m); 654 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 655 #ifdef RATELIMIT 656 if (inp != NULL) { 657 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) 658 in_pcboutput_txrtlmt(inp, ifp, m); 659 /* stamp send tag on mbuf */ 660 m->m_pkthdr.snd_tag = inp->inp_snd_tag; 661 } else { 662 m->m_pkthdr.snd_tag = NULL; 663 } 664 #endif 665 error = (*ifp->if_output)(ifp, m, 666 (const struct sockaddr *)gw, ro); 667 #ifdef RATELIMIT 668 /* check for route change */ 669 if (error == EAGAIN) 670 in_pcboutput_eagain(inp); 671 #endif 672 goto done; 673 } 674 675 /* Balk when DF bit is set or the interface didn't support TSO. */ 676 if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) { 677 error = EMSGSIZE; 678 IPSTAT_INC(ips_cantfrag); 679 goto bad; 680 } 681 682 /* 683 * Too large for interface; fragment if possible. If successful, 684 * on return, m will point to a list of packets to be sent. 685 */ 686 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist); 687 if (error) 688 goto bad; 689 for (; m; m = m0) { 690 m0 = m->m_nextpkt; 691 m->m_nextpkt = 0; 692 if (error == 0) { 693 /* Record statistics for this interface address. */ 694 if (ia != NULL) { 695 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 696 counter_u64_add(ia->ia_ifa.ifa_obytes, 697 m->m_pkthdr.len); 698 } 699 /* 700 * Reset layer specific mbuf flags 701 * to avoid confusing upper layers. 702 */ 703 m_clrprotoflags(m); 704 705 IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp, 706 mtod(m, struct ip *), NULL); 707 #ifdef RATELIMIT 708 if (inp != NULL) { 709 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) 710 in_pcboutput_txrtlmt(inp, ifp, m); 711 /* stamp send tag on mbuf */ 712 m->m_pkthdr.snd_tag = inp->inp_snd_tag; 713 } else { 714 m->m_pkthdr.snd_tag = NULL; 715 } 716 #endif 717 error = (*ifp->if_output)(ifp, m, 718 (const struct sockaddr *)gw, ro); 719 #ifdef RATELIMIT 720 /* check for route change */ 721 if (error == EAGAIN) 722 in_pcboutput_eagain(inp); 723 #endif 724 } else 725 m_freem(m); 726 } 727 728 if (error == 0) 729 IPSTAT_INC(ips_fragmented); 730 731 done: 732 if (ro == &iproute) 733 RO_RTFREE(ro); 734 else if (rte == NULL) 735 /* 736 * If the caller supplied a route but somehow the reference 737 * to it has been released need to prevent the caller 738 * calling RTFREE on it again. 739 */ 740 ro->ro_rt = NULL; 741 if (have_ia_ref) 742 ifa_free(&ia->ia_ifa); 743 return (error); 744 bad: 745 m_freem(m); 746 goto done; 747 } 748 749 /* 750 * Create a chain of fragments which fit the given mtu. m_frag points to the 751 * mbuf to be fragmented; on return it points to the chain with the fragments. 752 * Return 0 if no error. If error, m_frag may contain a partially built 753 * chain of fragments that should be freed by the caller. 754 * 755 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist) 756 */ 757 int 758 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 759 u_long if_hwassist_flags) 760 { 761 int error = 0; 762 int hlen = ip->ip_hl << 2; 763 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */ 764 int off; 765 struct mbuf *m0 = *m_frag; /* the original packet */ 766 int firstlen; 767 struct mbuf **mnext; 768 int nfrags; 769 uint16_t ip_len, ip_off; 770 771 ip_len = ntohs(ip->ip_len); 772 ip_off = ntohs(ip->ip_off); 773 774 if (ip_off & IP_DF) { /* Fragmentation not allowed */ 775 IPSTAT_INC(ips_cantfrag); 776 return EMSGSIZE; 777 } 778 779 /* 780 * Must be able to put at least 8 bytes per fragment. 781 */ 782 if (len < 8) 783 return EMSGSIZE; 784 785 /* 786 * If the interface will not calculate checksums on 787 * fragmented packets, then do it here. 788 */ 789 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 790 in_delayed_cksum(m0); 791 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 792 } 793 #ifdef SCTP 794 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) { 795 sctp_delayed_cksum(m0, hlen); 796 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 797 } 798 #endif 799 if (len > PAGE_SIZE) { 800 /* 801 * Fragment large datagrams such that each segment 802 * contains a multiple of PAGE_SIZE amount of data, 803 * plus headers. This enables a receiver to perform 804 * page-flipping zero-copy optimizations. 805 * 806 * XXX When does this help given that sender and receiver 807 * could have different page sizes, and also mtu could 808 * be less than the receiver's page size ? 809 */ 810 int newlen; 811 812 off = MIN(mtu, m0->m_pkthdr.len); 813 814 /* 815 * firstlen (off - hlen) must be aligned on an 816 * 8-byte boundary 817 */ 818 if (off < hlen) 819 goto smart_frag_failure; 820 off = ((off - hlen) & ~7) + hlen; 821 newlen = (~PAGE_MASK) & mtu; 822 if ((newlen + sizeof (struct ip)) > mtu) { 823 /* we failed, go back the default */ 824 smart_frag_failure: 825 newlen = len; 826 off = hlen + len; 827 } 828 len = newlen; 829 830 } else { 831 off = hlen + len; 832 } 833 834 firstlen = off - hlen; 835 mnext = &m0->m_nextpkt; /* pointer to next packet */ 836 837 /* 838 * Loop through length of segment after first fragment, 839 * make new header and copy data of each part and link onto chain. 840 * Here, m0 is the original packet, m is the fragment being created. 841 * The fragments are linked off the m_nextpkt of the original 842 * packet, which after processing serves as the first fragment. 843 */ 844 for (nfrags = 1; off < ip_len; off += len, nfrags++) { 845 struct ip *mhip; /* ip header on the fragment */ 846 struct mbuf *m; 847 int mhlen = sizeof (struct ip); 848 849 m = m_gethdr(M_NOWAIT, MT_DATA); 850 if (m == NULL) { 851 error = ENOBUFS; 852 IPSTAT_INC(ips_odropped); 853 goto done; 854 } 855 /* 856 * Make sure the complete packet header gets copied 857 * from the originating mbuf to the newly created 858 * mbuf. This also ensures that existing firewall 859 * classification(s), VLAN tags and so on get copied 860 * to the resulting fragmented packet(s): 861 */ 862 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) { 863 m_free(m); 864 error = ENOBUFS; 865 IPSTAT_INC(ips_odropped); 866 goto done; 867 } 868 /* 869 * In the first mbuf, leave room for the link header, then 870 * copy the original IP header including options. The payload 871 * goes into an additional mbuf chain returned by m_copym(). 872 */ 873 m->m_data += max_linkhdr; 874 mhip = mtod(m, struct ip *); 875 *mhip = *ip; 876 if (hlen > sizeof (struct ip)) { 877 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 878 mhip->ip_v = IPVERSION; 879 mhip->ip_hl = mhlen >> 2; 880 } 881 m->m_len = mhlen; 882 /* XXX do we need to add ip_off below ? */ 883 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 884 if (off + len >= ip_len) 885 len = ip_len - off; 886 else 887 mhip->ip_off |= IP_MF; 888 mhip->ip_len = htons((u_short)(len + mhlen)); 889 m->m_next = m_copym(m0, off, len, M_NOWAIT); 890 if (m->m_next == NULL) { /* copy failed */ 891 m_free(m); 892 error = ENOBUFS; /* ??? */ 893 IPSTAT_INC(ips_odropped); 894 goto done; 895 } 896 m->m_pkthdr.len = mhlen + len; 897 #ifdef MAC 898 mac_netinet_fragment(m0, m); 899 #endif 900 mhip->ip_off = htons(mhip->ip_off); 901 mhip->ip_sum = 0; 902 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 903 mhip->ip_sum = in_cksum(m, mhlen); 904 m->m_pkthdr.csum_flags &= ~CSUM_IP; 905 } 906 *mnext = m; 907 mnext = &m->m_nextpkt; 908 } 909 IPSTAT_ADD(ips_ofragments, nfrags); 910 911 /* 912 * Update first fragment by trimming what's been copied out 913 * and updating header. 914 */ 915 m_adj(m0, hlen + firstlen - ip_len); 916 m0->m_pkthdr.len = hlen + firstlen; 917 ip->ip_len = htons((u_short)m0->m_pkthdr.len); 918 ip->ip_off = htons(ip_off | IP_MF); 919 ip->ip_sum = 0; 920 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 921 ip->ip_sum = in_cksum(m0, hlen); 922 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 923 } 924 925 done: 926 *m_frag = m0; 927 return error; 928 } 929 930 void 931 in_delayed_cksum(struct mbuf *m) 932 { 933 struct ip *ip; 934 uint16_t csum, offset, ip_len; 935 936 ip = mtod(m, struct ip *); 937 offset = ip->ip_hl << 2 ; 938 ip_len = ntohs(ip->ip_len); 939 csum = in_cksum_skip(m, ip_len, offset); 940 if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0) 941 csum = 0xffff; 942 offset += m->m_pkthdr.csum_data; /* checksum offset */ 943 944 /* find the mbuf in the chain where the checksum starts*/ 945 while ((m != NULL) && (offset >= m->m_len)) { 946 offset -= m->m_len; 947 m = m->m_next; 948 } 949 KASSERT(m != NULL, ("in_delayed_cksum: checksum outside mbuf chain.")); 950 KASSERT(offset + sizeof(u_short) <= m->m_len, ("in_delayed_cksum: checksum split between mbufs.")); 951 *(u_short *)(m->m_data + offset) = csum; 952 } 953 954 /* 955 * IP socket option processing. 956 */ 957 int 958 ip_ctloutput(struct socket *so, struct sockopt *sopt) 959 { 960 struct inpcb *inp = sotoinpcb(so); 961 int error, optval; 962 #ifdef RSS 963 uint32_t rss_bucket; 964 int retval; 965 #endif 966 967 error = optval = 0; 968 if (sopt->sopt_level != IPPROTO_IP) { 969 error = EINVAL; 970 971 if (sopt->sopt_level == SOL_SOCKET && 972 sopt->sopt_dir == SOPT_SET) { 973 switch (sopt->sopt_name) { 974 case SO_REUSEADDR: 975 INP_WLOCK(inp); 976 if ((so->so_options & SO_REUSEADDR) != 0) 977 inp->inp_flags2 |= INP_REUSEADDR; 978 else 979 inp->inp_flags2 &= ~INP_REUSEADDR; 980 INP_WUNLOCK(inp); 981 error = 0; 982 break; 983 case SO_REUSEPORT: 984 INP_WLOCK(inp); 985 if ((so->so_options & SO_REUSEPORT) != 0) 986 inp->inp_flags2 |= INP_REUSEPORT; 987 else 988 inp->inp_flags2 &= ~INP_REUSEPORT; 989 INP_WUNLOCK(inp); 990 error = 0; 991 break; 992 case SO_SETFIB: 993 INP_WLOCK(inp); 994 inp->inp_inc.inc_fibnum = so->so_fibnum; 995 INP_WUNLOCK(inp); 996 error = 0; 997 break; 998 case SO_MAX_PACING_RATE: 999 #ifdef RATELIMIT 1000 INP_WLOCK(inp); 1001 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 1002 INP_WUNLOCK(inp); 1003 error = 0; 1004 #else 1005 error = EOPNOTSUPP; 1006 #endif 1007 break; 1008 default: 1009 break; 1010 } 1011 } 1012 return (error); 1013 } 1014 1015 switch (sopt->sopt_dir) { 1016 case SOPT_SET: 1017 switch (sopt->sopt_name) { 1018 case IP_OPTIONS: 1019 #ifdef notyet 1020 case IP_RETOPTS: 1021 #endif 1022 { 1023 struct mbuf *m; 1024 if (sopt->sopt_valsize > MLEN) { 1025 error = EMSGSIZE; 1026 break; 1027 } 1028 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA); 1029 if (m == NULL) { 1030 error = ENOBUFS; 1031 break; 1032 } 1033 m->m_len = sopt->sopt_valsize; 1034 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 1035 m->m_len); 1036 if (error) { 1037 m_free(m); 1038 break; 1039 } 1040 INP_WLOCK(inp); 1041 error = ip_pcbopts(inp, sopt->sopt_name, m); 1042 INP_WUNLOCK(inp); 1043 return (error); 1044 } 1045 1046 case IP_BINDANY: 1047 if (sopt->sopt_td != NULL) { 1048 error = priv_check(sopt->sopt_td, 1049 PRIV_NETINET_BINDANY); 1050 if (error) 1051 break; 1052 } 1053 /* FALLTHROUGH */ 1054 case IP_BINDMULTI: 1055 #ifdef RSS 1056 case IP_RSS_LISTEN_BUCKET: 1057 #endif 1058 case IP_TOS: 1059 case IP_TTL: 1060 case IP_MINTTL: 1061 case IP_RECVOPTS: 1062 case IP_RECVRETOPTS: 1063 case IP_ORIGDSTADDR: 1064 case IP_RECVDSTADDR: 1065 case IP_RECVTTL: 1066 case IP_RECVIF: 1067 case IP_ONESBCAST: 1068 case IP_DONTFRAG: 1069 case IP_RECVTOS: 1070 case IP_RECVFLOWID: 1071 #ifdef RSS 1072 case IP_RECVRSSBUCKETID: 1073 #endif 1074 error = sooptcopyin(sopt, &optval, sizeof optval, 1075 sizeof optval); 1076 if (error) 1077 break; 1078 1079 switch (sopt->sopt_name) { 1080 case IP_TOS: 1081 inp->inp_ip_tos = optval; 1082 break; 1083 1084 case IP_TTL: 1085 inp->inp_ip_ttl = optval; 1086 break; 1087 1088 case IP_MINTTL: 1089 if (optval >= 0 && optval <= MAXTTL) 1090 inp->inp_ip_minttl = optval; 1091 else 1092 error = EINVAL; 1093 break; 1094 1095 #define OPTSET(bit) do { \ 1096 INP_WLOCK(inp); \ 1097 if (optval) \ 1098 inp->inp_flags |= bit; \ 1099 else \ 1100 inp->inp_flags &= ~bit; \ 1101 INP_WUNLOCK(inp); \ 1102 } while (0) 1103 1104 #define OPTSET2(bit, val) do { \ 1105 INP_WLOCK(inp); \ 1106 if (val) \ 1107 inp->inp_flags2 |= bit; \ 1108 else \ 1109 inp->inp_flags2 &= ~bit; \ 1110 INP_WUNLOCK(inp); \ 1111 } while (0) 1112 1113 case IP_RECVOPTS: 1114 OPTSET(INP_RECVOPTS); 1115 break; 1116 1117 case IP_RECVRETOPTS: 1118 OPTSET(INP_RECVRETOPTS); 1119 break; 1120 1121 case IP_RECVDSTADDR: 1122 OPTSET(INP_RECVDSTADDR); 1123 break; 1124 1125 case IP_ORIGDSTADDR: 1126 OPTSET2(INP_ORIGDSTADDR, optval); 1127 break; 1128 1129 case IP_RECVTTL: 1130 OPTSET(INP_RECVTTL); 1131 break; 1132 1133 case IP_RECVIF: 1134 OPTSET(INP_RECVIF); 1135 break; 1136 1137 case IP_ONESBCAST: 1138 OPTSET(INP_ONESBCAST); 1139 break; 1140 case IP_DONTFRAG: 1141 OPTSET(INP_DONTFRAG); 1142 break; 1143 case IP_BINDANY: 1144 OPTSET(INP_BINDANY); 1145 break; 1146 case IP_RECVTOS: 1147 OPTSET(INP_RECVTOS); 1148 break; 1149 case IP_BINDMULTI: 1150 OPTSET2(INP_BINDMULTI, optval); 1151 break; 1152 case IP_RECVFLOWID: 1153 OPTSET2(INP_RECVFLOWID, optval); 1154 break; 1155 #ifdef RSS 1156 case IP_RSS_LISTEN_BUCKET: 1157 if ((optval >= 0) && 1158 (optval < rss_getnumbuckets())) { 1159 inp->inp_rss_listen_bucket = optval; 1160 OPTSET2(INP_RSS_BUCKET_SET, 1); 1161 } else { 1162 error = EINVAL; 1163 } 1164 break; 1165 case IP_RECVRSSBUCKETID: 1166 OPTSET2(INP_RECVRSSBUCKETID, optval); 1167 break; 1168 #endif 1169 } 1170 break; 1171 #undef OPTSET 1172 #undef OPTSET2 1173 1174 /* 1175 * Multicast socket options are processed by the in_mcast 1176 * module. 1177 */ 1178 case IP_MULTICAST_IF: 1179 case IP_MULTICAST_VIF: 1180 case IP_MULTICAST_TTL: 1181 case IP_MULTICAST_LOOP: 1182 case IP_ADD_MEMBERSHIP: 1183 case IP_DROP_MEMBERSHIP: 1184 case IP_ADD_SOURCE_MEMBERSHIP: 1185 case IP_DROP_SOURCE_MEMBERSHIP: 1186 case IP_BLOCK_SOURCE: 1187 case IP_UNBLOCK_SOURCE: 1188 case IP_MSFILTER: 1189 case MCAST_JOIN_GROUP: 1190 case MCAST_LEAVE_GROUP: 1191 case MCAST_JOIN_SOURCE_GROUP: 1192 case MCAST_LEAVE_SOURCE_GROUP: 1193 case MCAST_BLOCK_SOURCE: 1194 case MCAST_UNBLOCK_SOURCE: 1195 error = inp_setmoptions(inp, sopt); 1196 break; 1197 1198 case IP_PORTRANGE: 1199 error = sooptcopyin(sopt, &optval, sizeof optval, 1200 sizeof optval); 1201 if (error) 1202 break; 1203 1204 INP_WLOCK(inp); 1205 switch (optval) { 1206 case IP_PORTRANGE_DEFAULT: 1207 inp->inp_flags &= ~(INP_LOWPORT); 1208 inp->inp_flags &= ~(INP_HIGHPORT); 1209 break; 1210 1211 case IP_PORTRANGE_HIGH: 1212 inp->inp_flags &= ~(INP_LOWPORT); 1213 inp->inp_flags |= INP_HIGHPORT; 1214 break; 1215 1216 case IP_PORTRANGE_LOW: 1217 inp->inp_flags &= ~(INP_HIGHPORT); 1218 inp->inp_flags |= INP_LOWPORT; 1219 break; 1220 1221 default: 1222 error = EINVAL; 1223 break; 1224 } 1225 INP_WUNLOCK(inp); 1226 break; 1227 1228 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1229 case IP_IPSEC_POLICY: 1230 if (IPSEC_ENABLED(ipv4)) { 1231 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1232 break; 1233 } 1234 /* FALLTHROUGH */ 1235 #endif /* IPSEC */ 1236 1237 default: 1238 error = ENOPROTOOPT; 1239 break; 1240 } 1241 break; 1242 1243 case SOPT_GET: 1244 switch (sopt->sopt_name) { 1245 case IP_OPTIONS: 1246 case IP_RETOPTS: 1247 if (inp->inp_options) 1248 error = sooptcopyout(sopt, 1249 mtod(inp->inp_options, 1250 char *), 1251 inp->inp_options->m_len); 1252 else 1253 sopt->sopt_valsize = 0; 1254 break; 1255 1256 case IP_TOS: 1257 case IP_TTL: 1258 case IP_MINTTL: 1259 case IP_RECVOPTS: 1260 case IP_RECVRETOPTS: 1261 case IP_ORIGDSTADDR: 1262 case IP_RECVDSTADDR: 1263 case IP_RECVTTL: 1264 case IP_RECVIF: 1265 case IP_PORTRANGE: 1266 case IP_ONESBCAST: 1267 case IP_DONTFRAG: 1268 case IP_BINDANY: 1269 case IP_RECVTOS: 1270 case IP_BINDMULTI: 1271 case IP_FLOWID: 1272 case IP_FLOWTYPE: 1273 case IP_RECVFLOWID: 1274 #ifdef RSS 1275 case IP_RSSBUCKETID: 1276 case IP_RECVRSSBUCKETID: 1277 #endif 1278 switch (sopt->sopt_name) { 1279 1280 case IP_TOS: 1281 optval = inp->inp_ip_tos; 1282 break; 1283 1284 case IP_TTL: 1285 optval = inp->inp_ip_ttl; 1286 break; 1287 1288 case IP_MINTTL: 1289 optval = inp->inp_ip_minttl; 1290 break; 1291 1292 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1293 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0) 1294 1295 case IP_RECVOPTS: 1296 optval = OPTBIT(INP_RECVOPTS); 1297 break; 1298 1299 case IP_RECVRETOPTS: 1300 optval = OPTBIT(INP_RECVRETOPTS); 1301 break; 1302 1303 case IP_RECVDSTADDR: 1304 optval = OPTBIT(INP_RECVDSTADDR); 1305 break; 1306 1307 case IP_ORIGDSTADDR: 1308 optval = OPTBIT2(INP_ORIGDSTADDR); 1309 break; 1310 1311 case IP_RECVTTL: 1312 optval = OPTBIT(INP_RECVTTL); 1313 break; 1314 1315 case IP_RECVIF: 1316 optval = OPTBIT(INP_RECVIF); 1317 break; 1318 1319 case IP_PORTRANGE: 1320 if (inp->inp_flags & INP_HIGHPORT) 1321 optval = IP_PORTRANGE_HIGH; 1322 else if (inp->inp_flags & INP_LOWPORT) 1323 optval = IP_PORTRANGE_LOW; 1324 else 1325 optval = 0; 1326 break; 1327 1328 case IP_ONESBCAST: 1329 optval = OPTBIT(INP_ONESBCAST); 1330 break; 1331 case IP_DONTFRAG: 1332 optval = OPTBIT(INP_DONTFRAG); 1333 break; 1334 case IP_BINDANY: 1335 optval = OPTBIT(INP_BINDANY); 1336 break; 1337 case IP_RECVTOS: 1338 optval = OPTBIT(INP_RECVTOS); 1339 break; 1340 case IP_FLOWID: 1341 optval = inp->inp_flowid; 1342 break; 1343 case IP_FLOWTYPE: 1344 optval = inp->inp_flowtype; 1345 break; 1346 case IP_RECVFLOWID: 1347 optval = OPTBIT2(INP_RECVFLOWID); 1348 break; 1349 #ifdef RSS 1350 case IP_RSSBUCKETID: 1351 retval = rss_hash2bucket(inp->inp_flowid, 1352 inp->inp_flowtype, 1353 &rss_bucket); 1354 if (retval == 0) 1355 optval = rss_bucket; 1356 else 1357 error = EINVAL; 1358 break; 1359 case IP_RECVRSSBUCKETID: 1360 optval = OPTBIT2(INP_RECVRSSBUCKETID); 1361 break; 1362 #endif 1363 case IP_BINDMULTI: 1364 optval = OPTBIT2(INP_BINDMULTI); 1365 break; 1366 } 1367 error = sooptcopyout(sopt, &optval, sizeof optval); 1368 break; 1369 1370 /* 1371 * Multicast socket options are processed by the in_mcast 1372 * module. 1373 */ 1374 case IP_MULTICAST_IF: 1375 case IP_MULTICAST_VIF: 1376 case IP_MULTICAST_TTL: 1377 case IP_MULTICAST_LOOP: 1378 case IP_MSFILTER: 1379 error = inp_getmoptions(inp, sopt); 1380 break; 1381 1382 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1383 case IP_IPSEC_POLICY: 1384 if (IPSEC_ENABLED(ipv4)) { 1385 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1386 break; 1387 } 1388 /* FALLTHROUGH */ 1389 #endif /* IPSEC */ 1390 1391 default: 1392 error = ENOPROTOOPT; 1393 break; 1394 } 1395 break; 1396 } 1397 return (error); 1398 } 1399 1400 /* 1401 * Routine called from ip_output() to loop back a copy of an IP multicast 1402 * packet to the input queue of a specified interface. Note that this 1403 * calls the output routine of the loopback "driver", but with an interface 1404 * pointer that might NOT be a loopback interface -- evil, but easier than 1405 * replicating that code here. 1406 */ 1407 static void 1408 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen) 1409 { 1410 struct ip *ip; 1411 struct mbuf *copym; 1412 1413 /* 1414 * Make a deep copy of the packet because we're going to 1415 * modify the pack in order to generate checksums. 1416 */ 1417 copym = m_dup(m, M_NOWAIT); 1418 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen)) 1419 copym = m_pullup(copym, hlen); 1420 if (copym != NULL) { 1421 /* If needed, compute the checksum and mark it as valid. */ 1422 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1423 in_delayed_cksum(copym); 1424 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1425 copym->m_pkthdr.csum_flags |= 1426 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1427 copym->m_pkthdr.csum_data = 0xffff; 1428 } 1429 /* 1430 * We don't bother to fragment if the IP length is greater 1431 * than the interface's MTU. Can this possibly matter? 1432 */ 1433 ip = mtod(copym, struct ip *); 1434 ip->ip_sum = 0; 1435 ip->ip_sum = in_cksum(copym, hlen); 1436 if_simloop(ifp, copym, AF_INET, 0); 1437 } 1438 } 1439