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_ipsec.h" 39 #include "opt_kern_tls.h" 40 #include "opt_mbuf_stress_test.h" 41 #include "opt_ratelimit.h" 42 #include "opt_route.h" 43 #include "opt_rss.h" 44 #include "opt_sctp.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/ktls.h> 50 #include <sys/lock.h> 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/priv.h> 54 #include <sys/proc.h> 55 #include <sys/protosw.h> 56 #include <sys/rmlock.h> 57 #include <sys/sdt.h> 58 #include <sys/socket.h> 59 #include <sys/socketvar.h> 60 #include <sys/sysctl.h> 61 #include <sys/ucred.h> 62 63 #include <net/if.h> 64 #include <net/if_var.h> 65 #include <net/if_vlan_var.h> 66 #include <net/if_llatbl.h> 67 #include <net/ethernet.h> 68 #include <net/netisr.h> 69 #include <net/pfil.h> 70 #include <net/route.h> 71 #include <net/route/nhop.h> 72 #include <net/rss_config.h> 73 #include <net/vnet.h> 74 75 #include <netinet/in.h> 76 #include <netinet/in_fib.h> 77 #include <netinet/in_kdtrace.h> 78 #include <netinet/in_systm.h> 79 #include <netinet/ip.h> 80 #include <netinet/in_fib.h> 81 #include <netinet/in_pcb.h> 82 #include <netinet/in_rss.h> 83 #include <netinet/in_var.h> 84 #include <netinet/ip_var.h> 85 #include <netinet/ip_options.h> 86 87 #include <netinet/udp.h> 88 #include <netinet/udp_var.h> 89 90 #if defined(SCTP) || defined(SCTP_SUPPORT) 91 #include <netinet/sctp.h> 92 #include <netinet/sctp_crc32.h> 93 #endif 94 95 #include <netipsec/ipsec_support.h> 96 97 #include <machine/in_cksum.h> 98 99 #include <security/mac/mac_framework.h> 100 101 #ifdef MBUF_STRESS_TEST 102 static int mbuf_frag_size = 0; 103 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW, 104 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size"); 105 #endif 106 107 static void ip_mloopback(struct ifnet *, const struct mbuf *, int); 108 109 extern int in_mcast_loop; 110 extern struct protosw inetsw[]; 111 112 static inline int 113 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, int flags, 114 struct inpcb *inp, struct sockaddr_in *dst, int *fibnum, int *error) 115 { 116 struct m_tag *fwd_tag = NULL; 117 struct mbuf *m; 118 struct in_addr odst; 119 struct ip *ip; 120 int pflags = PFIL_OUT; 121 122 if (flags & IP_FORWARDING) 123 pflags |= PFIL_FWD; 124 125 m = *mp; 126 ip = mtod(m, struct ip *); 127 128 /* Run through list of hooks for output packets. */ 129 odst.s_addr = ip->ip_dst.s_addr; 130 switch (pfil_run_hooks(V_inet_pfil_head, mp, ifp, pflags, inp)) { 131 case PFIL_DROPPED: 132 *error = EACCES; 133 /* FALLTHROUGH */ 134 case PFIL_CONSUMED: 135 return 1; /* Finished */ 136 case PFIL_PASS: 137 *error = 0; 138 } 139 m = *mp; 140 ip = mtod(m, struct ip *); 141 142 /* See if destination IP address was changed by packet filter. */ 143 if (odst.s_addr != ip->ip_dst.s_addr) { 144 m->m_flags |= M_SKIP_FIREWALL; 145 /* If destination is now ourself drop to ip_input(). */ 146 if (in_localip(ip->ip_dst)) { 147 m->m_flags |= M_FASTFWD_OURS; 148 if (m->m_pkthdr.rcvif == NULL) 149 m->m_pkthdr.rcvif = V_loif; 150 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 151 m->m_pkthdr.csum_flags |= 152 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 153 m->m_pkthdr.csum_data = 0xffff; 154 } 155 m->m_pkthdr.csum_flags |= 156 CSUM_IP_CHECKED | CSUM_IP_VALID; 157 #if defined(SCTP) || defined(SCTP_SUPPORT) 158 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 159 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 160 #endif 161 *error = netisr_queue(NETISR_IP, m); 162 return 1; /* Finished */ 163 } 164 165 bzero(dst, sizeof(*dst)); 166 dst->sin_family = AF_INET; 167 dst->sin_len = sizeof(*dst); 168 dst->sin_addr = ip->ip_dst; 169 170 return -1; /* Reloop */ 171 } 172 /* See if fib was changed by packet filter. */ 173 if ((*fibnum) != M_GETFIB(m)) { 174 m->m_flags |= M_SKIP_FIREWALL; 175 *fibnum = M_GETFIB(m); 176 return -1; /* Reloop for FIB change */ 177 } 178 179 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 180 if (m->m_flags & M_FASTFWD_OURS) { 181 if (m->m_pkthdr.rcvif == NULL) 182 m->m_pkthdr.rcvif = V_loif; 183 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 184 m->m_pkthdr.csum_flags |= 185 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 186 m->m_pkthdr.csum_data = 0xffff; 187 } 188 #if defined(SCTP) || defined(SCTP_SUPPORT) 189 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 190 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 191 #endif 192 m->m_pkthdr.csum_flags |= 193 CSUM_IP_CHECKED | CSUM_IP_VALID; 194 195 *error = netisr_queue(NETISR_IP, m); 196 return 1; /* Finished */ 197 } 198 /* Or forward to some other address? */ 199 if ((m->m_flags & M_IP_NEXTHOP) && 200 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) { 201 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 202 m->m_flags |= M_SKIP_FIREWALL; 203 m->m_flags &= ~M_IP_NEXTHOP; 204 m_tag_delete(m, fwd_tag); 205 206 return -1; /* Reloop for CHANGE of dst */ 207 } 208 209 return 0; 210 } 211 212 static int 213 ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m, 214 const struct sockaddr *gw, struct route *ro, bool stamp_tag) 215 { 216 #ifdef KERN_TLS 217 struct ktls_session *tls = NULL; 218 #endif 219 struct m_snd_tag *mst; 220 int error; 221 222 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 223 mst = NULL; 224 225 #ifdef KERN_TLS 226 /* 227 * If this is an unencrypted TLS record, save a reference to 228 * the record. This local reference is used to call 229 * ktls_output_eagain after the mbuf has been freed (thus 230 * dropping the mbuf's reference) in if_output. 231 */ 232 if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) { 233 tls = ktls_hold(m->m_next->m_epg_tls); 234 mst = tls->snd_tag; 235 236 /* 237 * If a TLS session doesn't have a valid tag, it must 238 * have had an earlier ifp mismatch, so drop this 239 * packet. 240 */ 241 if (mst == NULL) { 242 m_freem(m); 243 error = EAGAIN; 244 goto done; 245 } 246 /* 247 * Always stamp tags that include NIC ktls. 248 */ 249 stamp_tag = true; 250 } 251 #endif 252 #ifdef RATELIMIT 253 if (inp != NULL && mst == NULL) { 254 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 || 255 (inp->inp_snd_tag != NULL && 256 inp->inp_snd_tag->ifp != ifp)) 257 in_pcboutput_txrtlmt(inp, ifp, m); 258 259 if (inp->inp_snd_tag != NULL) 260 mst = inp->inp_snd_tag; 261 } 262 #endif 263 if (stamp_tag && mst != NULL) { 264 KASSERT(m->m_pkthdr.rcvif == NULL, 265 ("trying to add a send tag to a forwarded packet")); 266 if (mst->ifp != ifp) { 267 m_freem(m); 268 error = EAGAIN; 269 goto done; 270 } 271 272 /* stamp send tag on mbuf */ 273 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst); 274 m->m_pkthdr.csum_flags |= CSUM_SND_TAG; 275 } 276 277 error = (*ifp->if_output)(ifp, m, gw, ro); 278 279 done: 280 /* Check for route change invalidating send tags. */ 281 #ifdef KERN_TLS 282 if (tls != NULL) { 283 if (error == EAGAIN) 284 error = ktls_output_eagain(inp, tls); 285 ktls_free(tls); 286 } 287 #endif 288 #ifdef RATELIMIT 289 if (error == EAGAIN) 290 in_pcboutput_eagain(inp); 291 #endif 292 return (error); 293 } 294 295 /* rte<>ro_flags translation */ 296 static inline void 297 rt_update_ro_flags(struct route *ro, const struct nhop_object *nh) 298 { 299 int nh_flags = nh->nh_flags; 300 301 ro->ro_flags &= ~ (RT_REJECT|RT_BLACKHOLE|RT_HAS_GW); 302 303 ro->ro_flags |= (nh_flags & NHF_REJECT) ? RT_REJECT : 0; 304 ro->ro_flags |= (nh_flags & NHF_BLACKHOLE) ? RT_BLACKHOLE : 0; 305 ro->ro_flags |= (nh_flags & NHF_GATEWAY) ? RT_HAS_GW : 0; 306 } 307 308 /* 309 * IP output. The packet in mbuf chain m contains a skeletal IP 310 * header (with len, off, ttl, proto, tos, src, dst). 311 * The mbuf chain containing the packet will be freed. 312 * The mbuf opt, if present, will not be freed. 313 * If route ro is present and has ro_rt initialized, route lookup would be 314 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 315 * then result of route lookup is stored in ro->ro_rt. 316 * 317 * In the IP forwarding case, the packet will arrive with options already 318 * inserted, so must have a NULL opt pointer. 319 */ 320 int 321 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags, 322 struct ip_moptions *imo, struct inpcb *inp) 323 { 324 struct rm_priotracker in_ifa_tracker; 325 struct ip *ip; 326 struct ifnet *ifp = NULL; /* keep compiler happy */ 327 struct mbuf *m0; 328 int hlen = sizeof (struct ip); 329 int mtu = 0; 330 int error = 0; 331 int vlan_pcp = -1; 332 struct sockaddr_in *dst; 333 const struct sockaddr *gw; 334 struct in_ifaddr *ia = NULL; 335 struct in_addr src; 336 int isbroadcast; 337 uint16_t ip_len, ip_off; 338 struct route iproute; 339 uint32_t fibnum; 340 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 341 int no_route_but_check_spd = 0; 342 #endif 343 344 M_ASSERTPKTHDR(m); 345 NET_EPOCH_ASSERT(); 346 347 if (inp != NULL) { 348 INP_LOCK_ASSERT(inp); 349 M_SETFIB(m, inp->inp_inc.inc_fibnum); 350 if ((flags & IP_NODEFAULTFLOWID) == 0) { 351 m->m_pkthdr.flowid = inp->inp_flowid; 352 M_HASHTYPE_SET(m, inp->inp_flowtype); 353 } 354 if ((inp->inp_flags2 & INP_2PCP_SET) != 0) 355 vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >> 356 INP_2PCP_SHIFT; 357 #ifdef NUMA 358 m->m_pkthdr.numa_domain = inp->inp_numa_domain; 359 #endif 360 } 361 362 if (opt) { 363 int len = 0; 364 m = ip_insertoptions(m, opt, &len); 365 if (len != 0) 366 hlen = len; /* ip->ip_hl is updated above */ 367 } 368 ip = mtod(m, struct ip *); 369 ip_len = ntohs(ip->ip_len); 370 ip_off = ntohs(ip->ip_off); 371 372 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 373 ip->ip_v = IPVERSION; 374 ip->ip_hl = hlen >> 2; 375 ip_fillid(ip); 376 } else { 377 /* Header already set, fetch hlen from there */ 378 hlen = ip->ip_hl << 2; 379 } 380 if ((flags & IP_FORWARDING) == 0) 381 IPSTAT_INC(ips_localout); 382 383 /* 384 * dst/gw handling: 385 * 386 * gw is readonly but can point either to dst OR rt_gateway, 387 * therefore we need restore gw if we're redoing lookup. 388 */ 389 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 390 if (ro == NULL) { 391 ro = &iproute; 392 bzero(ro, sizeof (*ro)); 393 } 394 dst = (struct sockaddr_in *)&ro->ro_dst; 395 if (ro->ro_nh == NULL) { 396 dst->sin_family = AF_INET; 397 dst->sin_len = sizeof(*dst); 398 dst->sin_addr = ip->ip_dst; 399 } 400 gw = (const struct sockaddr *)dst; 401 again: 402 /* 403 * Validate route against routing table additions; 404 * a better/more specific route might have been added. 405 */ 406 if (inp != NULL && ro->ro_nh != NULL) 407 NH_VALIDATE(ro, &inp->inp_rt_cookie, fibnum); 408 /* 409 * If there is a cached route, 410 * check that it is to the same destination 411 * and is still up. If not, free it and try again. 412 * The address family should also be checked in case of sharing the 413 * cache with IPv6. 414 * Also check whether routing cache needs invalidation. 415 */ 416 if (ro->ro_nh != NULL && 417 ((!NH_IS_VALID(ro->ro_nh)) || dst->sin_family != AF_INET || 418 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) 419 RO_INVALIDATE_CACHE(ro); 420 ia = NULL; 421 /* 422 * If routing to interface only, short circuit routing lookup. 423 * The use of an all-ones broadcast address implies this; an 424 * interface is specified by the broadcast address of an interface, 425 * or the destination address of a ptp interface. 426 */ 427 if (flags & IP_SENDONES) { 428 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst), 429 M_GETFIB(m)))) == NULL && 430 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 431 M_GETFIB(m)))) == NULL) { 432 IPSTAT_INC(ips_noroute); 433 error = ENETUNREACH; 434 goto bad; 435 } 436 ip->ip_dst.s_addr = INADDR_BROADCAST; 437 dst->sin_addr = ip->ip_dst; 438 ifp = ia->ia_ifp; 439 mtu = ifp->if_mtu; 440 ip->ip_ttl = 1; 441 isbroadcast = 1; 442 src = IA_SIN(ia)->sin_addr; 443 } else if (flags & IP_ROUTETOIF) { 444 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 445 M_GETFIB(m)))) == NULL && 446 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0, 447 M_GETFIB(m)))) == NULL) { 448 IPSTAT_INC(ips_noroute); 449 error = ENETUNREACH; 450 goto bad; 451 } 452 ifp = ia->ia_ifp; 453 mtu = ifp->if_mtu; 454 ip->ip_ttl = 1; 455 isbroadcast = ifp->if_flags & IFF_BROADCAST ? 456 in_ifaddr_broadcast(dst->sin_addr, ia) : 0; 457 src = IA_SIN(ia)->sin_addr; 458 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 459 imo != NULL && imo->imo_multicast_ifp != NULL) { 460 /* 461 * Bypass the normal routing lookup for multicast 462 * packets if the interface is specified. 463 */ 464 ifp = imo->imo_multicast_ifp; 465 mtu = ifp->if_mtu; 466 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 467 isbroadcast = 0; /* fool gcc */ 468 /* Interface may have no addresses. */ 469 if (ia != NULL) 470 src = IA_SIN(ia)->sin_addr; 471 else 472 src.s_addr = INADDR_ANY; 473 } else if (ro != &iproute) { 474 if (ro->ro_nh == NULL) { 475 /* 476 * We want to do any cloning requested by the link 477 * layer, as this is probably required in all cases 478 * for correct operation (as it is for ARP). 479 */ 480 uint32_t flowid; 481 flowid = m->m_pkthdr.flowid; 482 ro->ro_nh = fib4_lookup(fibnum, dst->sin_addr, 0, 483 NHR_REF, flowid); 484 485 if (ro->ro_nh == NULL || (!NH_IS_VALID(ro->ro_nh))) { 486 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 487 /* 488 * There is no route for this packet, but it is 489 * possible that a matching SPD entry exists. 490 */ 491 no_route_but_check_spd = 1; 492 goto sendit; 493 #endif 494 IPSTAT_INC(ips_noroute); 495 error = EHOSTUNREACH; 496 goto bad; 497 } 498 } 499 struct nhop_object *nh = ro->ro_nh; 500 501 ia = ifatoia(nh->nh_ifa); 502 ifp = nh->nh_ifp; 503 counter_u64_add(nh->nh_pksent, 1); 504 rt_update_ro_flags(ro, nh); 505 if (nh->nh_flags & NHF_GATEWAY) 506 gw = &nh->gw_sa; 507 if (nh->nh_flags & NHF_HOST) 508 isbroadcast = (nh->nh_flags & NHF_BROADCAST); 509 else if ((ifp->if_flags & IFF_BROADCAST) && (gw->sa_family == AF_INET)) 510 isbroadcast = in_ifaddr_broadcast(((const struct sockaddr_in *)gw)->sin_addr, ia); 511 else 512 isbroadcast = 0; 513 mtu = nh->nh_mtu; 514 src = IA_SIN(ia)->sin_addr; 515 } else { 516 struct nhop_object *nh; 517 518 nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_NONE, 519 m->m_pkthdr.flowid); 520 if (nh == NULL) { 521 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 522 /* 523 * There is no route for this packet, but it is 524 * possible that a matching SPD entry exists. 525 */ 526 no_route_but_check_spd = 1; 527 goto sendit; 528 #endif 529 IPSTAT_INC(ips_noroute); 530 error = EHOSTUNREACH; 531 goto bad; 532 } 533 ifp = nh->nh_ifp; 534 mtu = nh->nh_mtu; 535 rt_update_ro_flags(ro, nh); 536 if (nh->nh_flags & NHF_GATEWAY) 537 gw = &nh->gw_sa; 538 ia = ifatoia(nh->nh_ifa); 539 src = IA_SIN(ia)->sin_addr; 540 isbroadcast = (((nh->nh_flags & (NHF_HOST | NHF_BROADCAST)) == 541 (NHF_HOST | NHF_BROADCAST)) || 542 ((ifp->if_flags & IFF_BROADCAST) && 543 (gw->sa_family == AF_INET) && 544 in_ifaddr_broadcast(((const struct sockaddr_in *)gw)->sin_addr, ia))); 545 } 546 547 /* Catch a possible divide by zero later. */ 548 KASSERT(mtu > 0, ("%s: mtu %d <= 0, ro=%p (nh_flags=0x%08x) ifp=%p", 549 __func__, mtu, ro, 550 (ro != NULL && ro->ro_nh != NULL) ? ro->ro_nh->nh_flags : 0, ifp)); 551 552 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 553 m->m_flags |= M_MCAST; 554 /* 555 * IP destination address is multicast. Make sure "gw" 556 * still points to the address in "ro". (It may have been 557 * changed to point to a gateway address, above.) 558 */ 559 gw = (const struct sockaddr *)dst; 560 /* 561 * See if the caller provided any multicast options 562 */ 563 if (imo != NULL) { 564 ip->ip_ttl = imo->imo_multicast_ttl; 565 if (imo->imo_multicast_vif != -1) 566 ip->ip_src.s_addr = 567 ip_mcast_src ? 568 ip_mcast_src(imo->imo_multicast_vif) : 569 INADDR_ANY; 570 } else 571 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 572 /* 573 * Confirm that the outgoing interface supports multicast. 574 */ 575 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 576 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 577 IPSTAT_INC(ips_noroute); 578 error = ENETUNREACH; 579 goto bad; 580 } 581 } 582 /* 583 * If source address not specified yet, use address 584 * of outgoing interface. 585 */ 586 if (ip->ip_src.s_addr == INADDR_ANY) 587 ip->ip_src = src; 588 589 if ((imo == NULL && in_mcast_loop) || 590 (imo && imo->imo_multicast_loop)) { 591 /* 592 * Loop back multicast datagram if not expressly 593 * forbidden to do so, even if we are not a member 594 * of the group; ip_input() will filter it later, 595 * thus deferring a hash lookup and mutex acquisition 596 * at the expense of a cheap copy using m_copym(). 597 */ 598 ip_mloopback(ifp, m, hlen); 599 } else { 600 /* 601 * If we are acting as a multicast router, perform 602 * multicast forwarding as if the packet had just 603 * arrived on the interface to which we are about 604 * to send. The multicast forwarding function 605 * recursively calls this function, using the 606 * IP_FORWARDING flag to prevent infinite recursion. 607 * 608 * Multicasts that are looped back by ip_mloopback(), 609 * above, will be forwarded by the ip_input() routine, 610 * if necessary. 611 */ 612 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) { 613 /* 614 * If rsvp daemon is not running, do not 615 * set ip_moptions. This ensures that the packet 616 * is multicast and not just sent down one link 617 * as prescribed by rsvpd. 618 */ 619 if (!V_rsvp_on) 620 imo = NULL; 621 if (ip_mforward && 622 ip_mforward(ip, ifp, m, imo) != 0) { 623 m_freem(m); 624 goto done; 625 } 626 } 627 } 628 629 /* 630 * Multicasts with a time-to-live of zero may be looped- 631 * back, above, but must not be transmitted on a network. 632 * Also, multicasts addressed to the loopback interface 633 * are not sent -- the above call to ip_mloopback() will 634 * loop back a copy. ip_input() will drop the copy if 635 * this host does not belong to the destination group on 636 * the loopback interface. 637 */ 638 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 639 m_freem(m); 640 goto done; 641 } 642 643 goto sendit; 644 } 645 646 /* 647 * If the source address is not specified yet, use the address 648 * of the outoing interface. 649 */ 650 if (ip->ip_src.s_addr == INADDR_ANY) 651 ip->ip_src = src; 652 653 /* 654 * Look for broadcast address and 655 * verify user is allowed to send 656 * such a packet. 657 */ 658 if (isbroadcast) { 659 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 660 error = EADDRNOTAVAIL; 661 goto bad; 662 } 663 if ((flags & IP_ALLOWBROADCAST) == 0) { 664 error = EACCES; 665 goto bad; 666 } 667 /* don't allow broadcast messages to be fragmented */ 668 if (ip_len > mtu) { 669 error = EMSGSIZE; 670 goto bad; 671 } 672 m->m_flags |= M_BCAST; 673 } else { 674 m->m_flags &= ~M_BCAST; 675 } 676 677 sendit: 678 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 679 if (IPSEC_ENABLED(ipv4)) { 680 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) { 681 if (error == EINPROGRESS) 682 error = 0; 683 goto done; 684 } 685 } 686 /* 687 * Check if there was a route for this packet; return error if not. 688 */ 689 if (no_route_but_check_spd) { 690 IPSTAT_INC(ips_noroute); 691 error = EHOSTUNREACH; 692 goto bad; 693 } 694 /* Update variables that are affected by ipsec4_output(). */ 695 ip = mtod(m, struct ip *); 696 hlen = ip->ip_hl << 2; 697 #endif /* IPSEC */ 698 699 /* Jump over all PFIL processing if hooks are not active. */ 700 if (PFIL_HOOKED_OUT(V_inet_pfil_head)) { 701 switch (ip_output_pfil(&m, ifp, flags, inp, dst, &fibnum, 702 &error)) { 703 case 1: /* Finished */ 704 goto done; 705 706 case 0: /* Continue normally */ 707 ip = mtod(m, struct ip *); 708 break; 709 710 case -1: /* Need to try again */ 711 /* Reset everything for a new round */ 712 if (ro != NULL) { 713 RO_NHFREE(ro); 714 ro->ro_prepend = NULL; 715 } 716 gw = (const struct sockaddr *)dst; 717 ip = mtod(m, struct ip *); 718 goto again; 719 } 720 } 721 722 if (vlan_pcp > -1) 723 EVL_APPLY_PRI(m, vlan_pcp); 724 725 /* IN_LOOPBACK must not appear on the wire - RFC1122. */ 726 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 727 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 728 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 729 IPSTAT_INC(ips_badaddr); 730 error = EADDRNOTAVAIL; 731 goto bad; 732 } 733 } 734 735 /* Ensure the packet data is mapped if the interface requires it. */ 736 if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) { 737 m = mb_unmapped_to_ext(m); 738 if (m == NULL) { 739 IPSTAT_INC(ips_odropped); 740 error = ENOBUFS; 741 goto bad; 742 } 743 } 744 745 m->m_pkthdr.csum_flags |= CSUM_IP; 746 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 747 in_delayed_cksum(m); 748 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 749 } 750 #if defined(SCTP) || defined(SCTP_SUPPORT) 751 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 752 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 753 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 754 } 755 #endif 756 757 /* 758 * If small enough for interface, or the interface will take 759 * care of the fragmentation for us, we can just send directly. 760 * Note that if_vxlan could have requested TSO even though the outer 761 * frame is UDP. It is correct to not fragment such datagrams and 762 * instead just pass them on to the driver. 763 */ 764 if (ip_len <= mtu || 765 (m->m_pkthdr.csum_flags & ifp->if_hwassist & 766 (CSUM_TSO | CSUM_INNER_TSO)) != 0) { 767 ip->ip_sum = 0; 768 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 769 ip->ip_sum = in_cksum(m, hlen); 770 m->m_pkthdr.csum_flags &= ~CSUM_IP; 771 } 772 773 /* 774 * Record statistics for this interface address. 775 * With CSUM_TSO the byte/packet count will be slightly 776 * incorrect because we count the IP+TCP headers only 777 * once instead of for every generated packet. 778 */ 779 if (!(flags & IP_FORWARDING) && ia) { 780 if (m->m_pkthdr.csum_flags & 781 (CSUM_TSO | CSUM_INNER_TSO)) 782 counter_u64_add(ia->ia_ifa.ifa_opackets, 783 m->m_pkthdr.len / m->m_pkthdr.tso_segsz); 784 else 785 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 786 787 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len); 788 } 789 #ifdef MBUF_STRESS_TEST 790 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 791 m = m_fragment(m, M_NOWAIT, mbuf_frag_size); 792 #endif 793 /* 794 * Reset layer specific mbuf flags 795 * to avoid confusing lower layers. 796 */ 797 m_clrprotoflags(m); 798 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 799 error = ip_output_send(inp, ifp, m, gw, ro, 800 (flags & IP_NO_SND_TAG_RL) ? false : true); 801 goto done; 802 } 803 804 /* Balk when DF bit is set or the interface didn't support TSO. */ 805 if ((ip_off & IP_DF) || 806 (m->m_pkthdr.csum_flags & (CSUM_TSO | CSUM_INNER_TSO))) { 807 error = EMSGSIZE; 808 IPSTAT_INC(ips_cantfrag); 809 goto bad; 810 } 811 812 /* 813 * Too large for interface; fragment if possible. If successful, 814 * on return, m will point to a list of packets to be sent. 815 */ 816 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist); 817 if (error) 818 goto bad; 819 for (; m; m = m0) { 820 m0 = m->m_nextpkt; 821 m->m_nextpkt = 0; 822 if (error == 0) { 823 /* Record statistics for this interface address. */ 824 if (ia != NULL) { 825 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 826 counter_u64_add(ia->ia_ifa.ifa_obytes, 827 m->m_pkthdr.len); 828 } 829 /* 830 * Reset layer specific mbuf flags 831 * to avoid confusing upper layers. 832 */ 833 m_clrprotoflags(m); 834 835 IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp, 836 mtod(m, struct ip *), NULL); 837 error = ip_output_send(inp, ifp, m, gw, ro, true); 838 } else 839 m_freem(m); 840 } 841 842 if (error == 0) 843 IPSTAT_INC(ips_fragmented); 844 845 done: 846 return (error); 847 bad: 848 m_freem(m); 849 goto done; 850 } 851 852 /* 853 * Create a chain of fragments which fit the given mtu. m_frag points to the 854 * mbuf to be fragmented; on return it points to the chain with the fragments. 855 * Return 0 if no error. If error, m_frag may contain a partially built 856 * chain of fragments that should be freed by the caller. 857 * 858 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist) 859 */ 860 int 861 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 862 u_long if_hwassist_flags) 863 { 864 int error = 0; 865 int hlen = ip->ip_hl << 2; 866 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */ 867 int off; 868 struct mbuf *m0 = *m_frag; /* the original packet */ 869 int firstlen; 870 struct mbuf **mnext; 871 int nfrags; 872 uint16_t ip_len, ip_off; 873 874 ip_len = ntohs(ip->ip_len); 875 ip_off = ntohs(ip->ip_off); 876 877 if (ip_off & IP_DF) { /* Fragmentation not allowed */ 878 IPSTAT_INC(ips_cantfrag); 879 return EMSGSIZE; 880 } 881 882 /* 883 * Must be able to put at least 8 bytes per fragment. 884 */ 885 if (len < 8) 886 return EMSGSIZE; 887 888 /* 889 * If the interface will not calculate checksums on 890 * fragmented packets, then do it here. 891 */ 892 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 893 in_delayed_cksum(m0); 894 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 895 } 896 #if defined(SCTP) || defined(SCTP_SUPPORT) 897 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) { 898 sctp_delayed_cksum(m0, hlen); 899 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 900 } 901 #endif 902 if (len > PAGE_SIZE) { 903 /* 904 * Fragment large datagrams such that each segment 905 * contains a multiple of PAGE_SIZE amount of data, 906 * plus headers. This enables a receiver to perform 907 * page-flipping zero-copy optimizations. 908 * 909 * XXX When does this help given that sender and receiver 910 * could have different page sizes, and also mtu could 911 * be less than the receiver's page size ? 912 */ 913 int newlen; 914 915 off = MIN(mtu, m0->m_pkthdr.len); 916 917 /* 918 * firstlen (off - hlen) must be aligned on an 919 * 8-byte boundary 920 */ 921 if (off < hlen) 922 goto smart_frag_failure; 923 off = ((off - hlen) & ~7) + hlen; 924 newlen = (~PAGE_MASK) & mtu; 925 if ((newlen + sizeof (struct ip)) > mtu) { 926 /* we failed, go back the default */ 927 smart_frag_failure: 928 newlen = len; 929 off = hlen + len; 930 } 931 len = newlen; 932 933 } else { 934 off = hlen + len; 935 } 936 937 firstlen = off - hlen; 938 mnext = &m0->m_nextpkt; /* pointer to next packet */ 939 940 /* 941 * Loop through length of segment after first fragment, 942 * make new header and copy data of each part and link onto chain. 943 * Here, m0 is the original packet, m is the fragment being created. 944 * The fragments are linked off the m_nextpkt of the original 945 * packet, which after processing serves as the first fragment. 946 */ 947 for (nfrags = 1; off < ip_len; off += len, nfrags++) { 948 struct ip *mhip; /* ip header on the fragment */ 949 struct mbuf *m; 950 int mhlen = sizeof (struct ip); 951 952 m = m_gethdr(M_NOWAIT, MT_DATA); 953 if (m == NULL) { 954 error = ENOBUFS; 955 IPSTAT_INC(ips_odropped); 956 goto done; 957 } 958 /* 959 * Make sure the complete packet header gets copied 960 * from the originating mbuf to the newly created 961 * mbuf. This also ensures that existing firewall 962 * classification(s), VLAN tags and so on get copied 963 * to the resulting fragmented packet(s): 964 */ 965 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) { 966 m_free(m); 967 error = ENOBUFS; 968 IPSTAT_INC(ips_odropped); 969 goto done; 970 } 971 /* 972 * In the first mbuf, leave room for the link header, then 973 * copy the original IP header including options. The payload 974 * goes into an additional mbuf chain returned by m_copym(). 975 */ 976 m->m_data += max_linkhdr; 977 mhip = mtod(m, struct ip *); 978 *mhip = *ip; 979 if (hlen > sizeof (struct ip)) { 980 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 981 mhip->ip_v = IPVERSION; 982 mhip->ip_hl = mhlen >> 2; 983 } 984 m->m_len = mhlen; 985 /* XXX do we need to add ip_off below ? */ 986 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 987 if (off + len >= ip_len) 988 len = ip_len - off; 989 else 990 mhip->ip_off |= IP_MF; 991 mhip->ip_len = htons((u_short)(len + mhlen)); 992 m->m_next = m_copym(m0, off, len, M_NOWAIT); 993 if (m->m_next == NULL) { /* copy failed */ 994 m_free(m); 995 error = ENOBUFS; /* ??? */ 996 IPSTAT_INC(ips_odropped); 997 goto done; 998 } 999 m->m_pkthdr.len = mhlen + len; 1000 #ifdef MAC 1001 mac_netinet_fragment(m0, m); 1002 #endif 1003 mhip->ip_off = htons(mhip->ip_off); 1004 mhip->ip_sum = 0; 1005 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 1006 mhip->ip_sum = in_cksum(m, mhlen); 1007 m->m_pkthdr.csum_flags &= ~CSUM_IP; 1008 } 1009 *mnext = m; 1010 mnext = &m->m_nextpkt; 1011 } 1012 IPSTAT_ADD(ips_ofragments, nfrags); 1013 1014 /* 1015 * Update first fragment by trimming what's been copied out 1016 * and updating header. 1017 */ 1018 m_adj(m0, hlen + firstlen - ip_len); 1019 m0->m_pkthdr.len = hlen + firstlen; 1020 ip->ip_len = htons((u_short)m0->m_pkthdr.len); 1021 ip->ip_off = htons(ip_off | IP_MF); 1022 ip->ip_sum = 0; 1023 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 1024 ip->ip_sum = in_cksum(m0, hlen); 1025 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 1026 } 1027 1028 done: 1029 *m_frag = m0; 1030 return error; 1031 } 1032 1033 void 1034 in_delayed_cksum(struct mbuf *m) 1035 { 1036 struct ip *ip; 1037 struct udphdr *uh; 1038 uint16_t cklen, csum, offset; 1039 1040 ip = mtod(m, struct ip *); 1041 offset = ip->ip_hl << 2 ; 1042 1043 if (m->m_pkthdr.csum_flags & CSUM_UDP) { 1044 /* if udp header is not in the first mbuf copy udplen */ 1045 if (offset + sizeof(struct udphdr) > m->m_len) { 1046 m_copydata(m, offset + offsetof(struct udphdr, 1047 uh_ulen), sizeof(cklen), (caddr_t)&cklen); 1048 cklen = ntohs(cklen); 1049 } else { 1050 uh = (struct udphdr *)mtodo(m, offset); 1051 cklen = ntohs(uh->uh_ulen); 1052 } 1053 csum = in_cksum_skip(m, cklen + offset, offset); 1054 if (csum == 0) 1055 csum = 0xffff; 1056 } else { 1057 cklen = ntohs(ip->ip_len); 1058 csum = in_cksum_skip(m, cklen, offset); 1059 } 1060 offset += m->m_pkthdr.csum_data; /* checksum offset */ 1061 1062 if (offset + sizeof(csum) > m->m_len) 1063 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum); 1064 else 1065 *(u_short *)mtodo(m, offset) = csum; 1066 } 1067 1068 /* 1069 * IP socket option processing. 1070 */ 1071 int 1072 ip_ctloutput(struct socket *so, struct sockopt *sopt) 1073 { 1074 struct inpcb *inp = sotoinpcb(so); 1075 int error, optval; 1076 #ifdef RSS 1077 uint32_t rss_bucket; 1078 int retval; 1079 #endif 1080 1081 error = optval = 0; 1082 if (sopt->sopt_level != IPPROTO_IP) { 1083 error = EINVAL; 1084 1085 if (sopt->sopt_level == SOL_SOCKET && 1086 sopt->sopt_dir == SOPT_SET) { 1087 switch (sopt->sopt_name) { 1088 case SO_REUSEADDR: 1089 INP_WLOCK(inp); 1090 if ((so->so_options & SO_REUSEADDR) != 0) 1091 inp->inp_flags2 |= INP_REUSEADDR; 1092 else 1093 inp->inp_flags2 &= ~INP_REUSEADDR; 1094 INP_WUNLOCK(inp); 1095 error = 0; 1096 break; 1097 case SO_REUSEPORT: 1098 INP_WLOCK(inp); 1099 if ((so->so_options & SO_REUSEPORT) != 0) 1100 inp->inp_flags2 |= INP_REUSEPORT; 1101 else 1102 inp->inp_flags2 &= ~INP_REUSEPORT; 1103 INP_WUNLOCK(inp); 1104 error = 0; 1105 break; 1106 case SO_REUSEPORT_LB: 1107 INP_WLOCK(inp); 1108 if ((so->so_options & SO_REUSEPORT_LB) != 0) 1109 inp->inp_flags2 |= INP_REUSEPORT_LB; 1110 else 1111 inp->inp_flags2 &= ~INP_REUSEPORT_LB; 1112 INP_WUNLOCK(inp); 1113 error = 0; 1114 break; 1115 case SO_SETFIB: 1116 INP_WLOCK(inp); 1117 inp->inp_inc.inc_fibnum = so->so_fibnum; 1118 INP_WUNLOCK(inp); 1119 error = 0; 1120 break; 1121 case SO_MAX_PACING_RATE: 1122 #ifdef RATELIMIT 1123 INP_WLOCK(inp); 1124 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 1125 INP_WUNLOCK(inp); 1126 error = 0; 1127 #else 1128 error = EOPNOTSUPP; 1129 #endif 1130 break; 1131 default: 1132 break; 1133 } 1134 } 1135 return (error); 1136 } 1137 1138 switch (sopt->sopt_dir) { 1139 case SOPT_SET: 1140 switch (sopt->sopt_name) { 1141 case IP_OPTIONS: 1142 #ifdef notyet 1143 case IP_RETOPTS: 1144 #endif 1145 { 1146 struct mbuf *m; 1147 if (sopt->sopt_valsize > MLEN) { 1148 error = EMSGSIZE; 1149 break; 1150 } 1151 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA); 1152 if (m == NULL) { 1153 error = ENOBUFS; 1154 break; 1155 } 1156 m->m_len = sopt->sopt_valsize; 1157 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 1158 m->m_len); 1159 if (error) { 1160 m_free(m); 1161 break; 1162 } 1163 INP_WLOCK(inp); 1164 error = ip_pcbopts(inp, sopt->sopt_name, m); 1165 INP_WUNLOCK(inp); 1166 return (error); 1167 } 1168 1169 case IP_BINDANY: 1170 if (sopt->sopt_td != NULL) { 1171 error = priv_check(sopt->sopt_td, 1172 PRIV_NETINET_BINDANY); 1173 if (error) 1174 break; 1175 } 1176 /* FALLTHROUGH */ 1177 case IP_BINDMULTI: 1178 #ifdef RSS 1179 case IP_RSS_LISTEN_BUCKET: 1180 #endif 1181 case IP_TOS: 1182 case IP_TTL: 1183 case IP_MINTTL: 1184 case IP_RECVOPTS: 1185 case IP_RECVRETOPTS: 1186 case IP_ORIGDSTADDR: 1187 case IP_RECVDSTADDR: 1188 case IP_RECVTTL: 1189 case IP_RECVIF: 1190 case IP_ONESBCAST: 1191 case IP_DONTFRAG: 1192 case IP_RECVTOS: 1193 case IP_RECVFLOWID: 1194 #ifdef RSS 1195 case IP_RECVRSSBUCKETID: 1196 #endif 1197 case IP_VLAN_PCP: 1198 error = sooptcopyin(sopt, &optval, sizeof optval, 1199 sizeof optval); 1200 if (error) 1201 break; 1202 1203 switch (sopt->sopt_name) { 1204 case IP_TOS: 1205 inp->inp_ip_tos = optval; 1206 break; 1207 1208 case IP_TTL: 1209 inp->inp_ip_ttl = optval; 1210 break; 1211 1212 case IP_MINTTL: 1213 if (optval >= 0 && optval <= MAXTTL) 1214 inp->inp_ip_minttl = optval; 1215 else 1216 error = EINVAL; 1217 break; 1218 1219 #define OPTSET(bit) do { \ 1220 INP_WLOCK(inp); \ 1221 if (optval) \ 1222 inp->inp_flags |= bit; \ 1223 else \ 1224 inp->inp_flags &= ~bit; \ 1225 INP_WUNLOCK(inp); \ 1226 } while (0) 1227 1228 #define OPTSET2(bit, val) do { \ 1229 INP_WLOCK(inp); \ 1230 if (val) \ 1231 inp->inp_flags2 |= bit; \ 1232 else \ 1233 inp->inp_flags2 &= ~bit; \ 1234 INP_WUNLOCK(inp); \ 1235 } while (0) 1236 1237 case IP_RECVOPTS: 1238 OPTSET(INP_RECVOPTS); 1239 break; 1240 1241 case IP_RECVRETOPTS: 1242 OPTSET(INP_RECVRETOPTS); 1243 break; 1244 1245 case IP_RECVDSTADDR: 1246 OPTSET(INP_RECVDSTADDR); 1247 break; 1248 1249 case IP_ORIGDSTADDR: 1250 OPTSET2(INP_ORIGDSTADDR, optval); 1251 break; 1252 1253 case IP_RECVTTL: 1254 OPTSET(INP_RECVTTL); 1255 break; 1256 1257 case IP_RECVIF: 1258 OPTSET(INP_RECVIF); 1259 break; 1260 1261 case IP_ONESBCAST: 1262 OPTSET(INP_ONESBCAST); 1263 break; 1264 case IP_DONTFRAG: 1265 OPTSET(INP_DONTFRAG); 1266 break; 1267 case IP_BINDANY: 1268 OPTSET(INP_BINDANY); 1269 break; 1270 case IP_RECVTOS: 1271 OPTSET(INP_RECVTOS); 1272 break; 1273 case IP_BINDMULTI: 1274 OPTSET2(INP_BINDMULTI, optval); 1275 break; 1276 case IP_RECVFLOWID: 1277 OPTSET2(INP_RECVFLOWID, optval); 1278 break; 1279 #ifdef RSS 1280 case IP_RSS_LISTEN_BUCKET: 1281 if ((optval >= 0) && 1282 (optval < rss_getnumbuckets())) { 1283 inp->inp_rss_listen_bucket = optval; 1284 OPTSET2(INP_RSS_BUCKET_SET, 1); 1285 } else { 1286 error = EINVAL; 1287 } 1288 break; 1289 case IP_RECVRSSBUCKETID: 1290 OPTSET2(INP_RECVRSSBUCKETID, optval); 1291 break; 1292 #endif 1293 case IP_VLAN_PCP: 1294 if ((optval >= -1) && (optval <= 1295 (INP_2PCP_MASK >> INP_2PCP_SHIFT))) { 1296 if (optval == -1) { 1297 INP_WLOCK(inp); 1298 inp->inp_flags2 &= 1299 ~(INP_2PCP_SET | 1300 INP_2PCP_MASK); 1301 INP_WUNLOCK(inp); 1302 } else { 1303 INP_WLOCK(inp); 1304 inp->inp_flags2 |= 1305 INP_2PCP_SET; 1306 inp->inp_flags2 &= 1307 ~INP_2PCP_MASK; 1308 inp->inp_flags2 |= 1309 optval << INP_2PCP_SHIFT; 1310 INP_WUNLOCK(inp); 1311 } 1312 } else 1313 error = EINVAL; 1314 break; 1315 } 1316 break; 1317 #undef OPTSET 1318 #undef OPTSET2 1319 1320 /* 1321 * Multicast socket options are processed by the in_mcast 1322 * module. 1323 */ 1324 case IP_MULTICAST_IF: 1325 case IP_MULTICAST_VIF: 1326 case IP_MULTICAST_TTL: 1327 case IP_MULTICAST_LOOP: 1328 case IP_ADD_MEMBERSHIP: 1329 case IP_DROP_MEMBERSHIP: 1330 case IP_ADD_SOURCE_MEMBERSHIP: 1331 case IP_DROP_SOURCE_MEMBERSHIP: 1332 case IP_BLOCK_SOURCE: 1333 case IP_UNBLOCK_SOURCE: 1334 case IP_MSFILTER: 1335 case MCAST_JOIN_GROUP: 1336 case MCAST_LEAVE_GROUP: 1337 case MCAST_JOIN_SOURCE_GROUP: 1338 case MCAST_LEAVE_SOURCE_GROUP: 1339 case MCAST_BLOCK_SOURCE: 1340 case MCAST_UNBLOCK_SOURCE: 1341 error = inp_setmoptions(inp, sopt); 1342 break; 1343 1344 case IP_PORTRANGE: 1345 error = sooptcopyin(sopt, &optval, sizeof optval, 1346 sizeof optval); 1347 if (error) 1348 break; 1349 1350 INP_WLOCK(inp); 1351 switch (optval) { 1352 case IP_PORTRANGE_DEFAULT: 1353 inp->inp_flags &= ~(INP_LOWPORT); 1354 inp->inp_flags &= ~(INP_HIGHPORT); 1355 break; 1356 1357 case IP_PORTRANGE_HIGH: 1358 inp->inp_flags &= ~(INP_LOWPORT); 1359 inp->inp_flags |= INP_HIGHPORT; 1360 break; 1361 1362 case IP_PORTRANGE_LOW: 1363 inp->inp_flags &= ~(INP_HIGHPORT); 1364 inp->inp_flags |= INP_LOWPORT; 1365 break; 1366 1367 default: 1368 error = EINVAL; 1369 break; 1370 } 1371 INP_WUNLOCK(inp); 1372 break; 1373 1374 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1375 case IP_IPSEC_POLICY: 1376 if (IPSEC_ENABLED(ipv4)) { 1377 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1378 break; 1379 } 1380 /* FALLTHROUGH */ 1381 #endif /* IPSEC */ 1382 1383 default: 1384 error = ENOPROTOOPT; 1385 break; 1386 } 1387 break; 1388 1389 case SOPT_GET: 1390 switch (sopt->sopt_name) { 1391 case IP_OPTIONS: 1392 case IP_RETOPTS: 1393 INP_RLOCK(inp); 1394 if (inp->inp_options) { 1395 struct mbuf *options; 1396 1397 options = m_copym(inp->inp_options, 0, 1398 M_COPYALL, M_NOWAIT); 1399 INP_RUNLOCK(inp); 1400 if (options != NULL) { 1401 error = sooptcopyout(sopt, 1402 mtod(options, char *), 1403 options->m_len); 1404 m_freem(options); 1405 } else 1406 error = ENOMEM; 1407 } else { 1408 INP_RUNLOCK(inp); 1409 sopt->sopt_valsize = 0; 1410 } 1411 break; 1412 1413 case IP_TOS: 1414 case IP_TTL: 1415 case IP_MINTTL: 1416 case IP_RECVOPTS: 1417 case IP_RECVRETOPTS: 1418 case IP_ORIGDSTADDR: 1419 case IP_RECVDSTADDR: 1420 case IP_RECVTTL: 1421 case IP_RECVIF: 1422 case IP_PORTRANGE: 1423 case IP_ONESBCAST: 1424 case IP_DONTFRAG: 1425 case IP_BINDANY: 1426 case IP_RECVTOS: 1427 case IP_BINDMULTI: 1428 case IP_FLOWID: 1429 case IP_FLOWTYPE: 1430 case IP_RECVFLOWID: 1431 #ifdef RSS 1432 case IP_RSSBUCKETID: 1433 case IP_RECVRSSBUCKETID: 1434 #endif 1435 case IP_VLAN_PCP: 1436 switch (sopt->sopt_name) { 1437 case IP_TOS: 1438 optval = inp->inp_ip_tos; 1439 break; 1440 1441 case IP_TTL: 1442 optval = inp->inp_ip_ttl; 1443 break; 1444 1445 case IP_MINTTL: 1446 optval = inp->inp_ip_minttl; 1447 break; 1448 1449 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1450 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0) 1451 1452 case IP_RECVOPTS: 1453 optval = OPTBIT(INP_RECVOPTS); 1454 break; 1455 1456 case IP_RECVRETOPTS: 1457 optval = OPTBIT(INP_RECVRETOPTS); 1458 break; 1459 1460 case IP_RECVDSTADDR: 1461 optval = OPTBIT(INP_RECVDSTADDR); 1462 break; 1463 1464 case IP_ORIGDSTADDR: 1465 optval = OPTBIT2(INP_ORIGDSTADDR); 1466 break; 1467 1468 case IP_RECVTTL: 1469 optval = OPTBIT(INP_RECVTTL); 1470 break; 1471 1472 case IP_RECVIF: 1473 optval = OPTBIT(INP_RECVIF); 1474 break; 1475 1476 case IP_PORTRANGE: 1477 if (inp->inp_flags & INP_HIGHPORT) 1478 optval = IP_PORTRANGE_HIGH; 1479 else if (inp->inp_flags & INP_LOWPORT) 1480 optval = IP_PORTRANGE_LOW; 1481 else 1482 optval = 0; 1483 break; 1484 1485 case IP_ONESBCAST: 1486 optval = OPTBIT(INP_ONESBCAST); 1487 break; 1488 case IP_DONTFRAG: 1489 optval = OPTBIT(INP_DONTFRAG); 1490 break; 1491 case IP_BINDANY: 1492 optval = OPTBIT(INP_BINDANY); 1493 break; 1494 case IP_RECVTOS: 1495 optval = OPTBIT(INP_RECVTOS); 1496 break; 1497 case IP_FLOWID: 1498 optval = inp->inp_flowid; 1499 break; 1500 case IP_FLOWTYPE: 1501 optval = inp->inp_flowtype; 1502 break; 1503 case IP_RECVFLOWID: 1504 optval = OPTBIT2(INP_RECVFLOWID); 1505 break; 1506 #ifdef RSS 1507 case IP_RSSBUCKETID: 1508 retval = rss_hash2bucket(inp->inp_flowid, 1509 inp->inp_flowtype, 1510 &rss_bucket); 1511 if (retval == 0) 1512 optval = rss_bucket; 1513 else 1514 error = EINVAL; 1515 break; 1516 case IP_RECVRSSBUCKETID: 1517 optval = OPTBIT2(INP_RECVRSSBUCKETID); 1518 break; 1519 #endif 1520 case IP_BINDMULTI: 1521 optval = OPTBIT2(INP_BINDMULTI); 1522 break; 1523 case IP_VLAN_PCP: 1524 if (OPTBIT2(INP_2PCP_SET)) { 1525 optval = (inp->inp_flags2 & 1526 INP_2PCP_MASK) >> INP_2PCP_SHIFT; 1527 } else { 1528 optval = -1; 1529 } 1530 break; 1531 } 1532 error = sooptcopyout(sopt, &optval, sizeof optval); 1533 break; 1534 1535 /* 1536 * Multicast socket options are processed by the in_mcast 1537 * module. 1538 */ 1539 case IP_MULTICAST_IF: 1540 case IP_MULTICAST_VIF: 1541 case IP_MULTICAST_TTL: 1542 case IP_MULTICAST_LOOP: 1543 case IP_MSFILTER: 1544 error = inp_getmoptions(inp, sopt); 1545 break; 1546 1547 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1548 case IP_IPSEC_POLICY: 1549 if (IPSEC_ENABLED(ipv4)) { 1550 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1551 break; 1552 } 1553 /* FALLTHROUGH */ 1554 #endif /* IPSEC */ 1555 1556 default: 1557 error = ENOPROTOOPT; 1558 break; 1559 } 1560 break; 1561 } 1562 return (error); 1563 } 1564 1565 /* 1566 * Routine called from ip_output() to loop back a copy of an IP multicast 1567 * packet to the input queue of a specified interface. Note that this 1568 * calls the output routine of the loopback "driver", but with an interface 1569 * pointer that might NOT be a loopback interface -- evil, but easier than 1570 * replicating that code here. 1571 */ 1572 static void 1573 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen) 1574 { 1575 struct ip *ip; 1576 struct mbuf *copym; 1577 1578 /* 1579 * Make a deep copy of the packet because we're going to 1580 * modify the pack in order to generate checksums. 1581 */ 1582 copym = m_dup(m, M_NOWAIT); 1583 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen)) 1584 copym = m_pullup(copym, hlen); 1585 if (copym != NULL) { 1586 /* If needed, compute the checksum and mark it as valid. */ 1587 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1588 in_delayed_cksum(copym); 1589 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1590 copym->m_pkthdr.csum_flags |= 1591 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1592 copym->m_pkthdr.csum_data = 0xffff; 1593 } 1594 /* 1595 * We don't bother to fragment if the IP length is greater 1596 * than the interface's MTU. Can this possibly matter? 1597 */ 1598 ip = mtod(copym, struct ip *); 1599 ip->ip_sum = 0; 1600 ip->ip_sum = in_cksum(copym, hlen); 1601 if_simloop(ifp, copym, AF_INET, 0); 1602 } 1603 } 1604