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 32 #include "opt_inet.h" 33 #include "opt_ipsec.h" 34 #include "opt_kern_tls.h" 35 #include "opt_mbuf_stress_test.h" 36 #include "opt_ratelimit.h" 37 #include "opt_rss.h" 38 #include "opt_sctp.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/ktls.h> 44 #include <sys/lock.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/protosw.h> 50 #include <sys/sdt.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/sysctl.h> 54 #include <sys/ucred.h> 55 56 #include <net/if.h> 57 #include <net/if_var.h> 58 #include <net/if_private.h> 59 #include <net/if_vlan_var.h> 60 #include <net/if_llatbl.h> 61 #include <net/ethernet.h> 62 #include <net/netisr.h> 63 #include <net/pfil.h> 64 #include <net/route.h> 65 #include <net/route/nhop.h> 66 #include <net/rss_config.h> 67 #include <net/vnet.h> 68 69 #include <netinet/in.h> 70 #include <netinet/in_fib.h> 71 #include <netinet/in_kdtrace.h> 72 #include <netinet/in_systm.h> 73 #include <netinet/ip.h> 74 #include <netinet/in_fib.h> 75 #include <netinet/in_pcb.h> 76 #include <netinet/in_rss.h> 77 #include <netinet/in_var.h> 78 #include <netinet/ip_var.h> 79 #include <netinet/ip_options.h> 80 #include <netinet/ip_mroute.h> 81 82 #include <netinet/udp.h> 83 #include <netinet/udp_var.h> 84 85 #if defined(SCTP) || defined(SCTP_SUPPORT) 86 #include <netinet/sctp.h> 87 #include <netinet/sctp_crc32.h> 88 #endif 89 90 #include <netipsec/ipsec_support.h> 91 92 #include <machine/in_cksum.h> 93 94 #include <security/mac/mac_framework.h> 95 96 #ifdef MBUF_STRESS_TEST 97 static int mbuf_frag_size = 0; 98 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW, 99 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size"); 100 #endif 101 102 static void ip_mloopback(struct ifnet *, const struct mbuf *, int); 103 104 extern int in_mcast_loop; 105 106 static inline int 107 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, int flags, 108 struct inpcb *inp, 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 int ret; 115 116 m = *mp; 117 ip = mtod(m, struct ip *); 118 119 /* Run through list of hooks for output packets. */ 120 odst.s_addr = ip->ip_dst.s_addr; 121 if (flags & IP_FORWARDING) 122 ret = pfil_mbuf_fwd(V_inet_pfil_head, mp, ifp, inp); 123 else 124 ret = pfil_mbuf_out(V_inet_pfil_head, mp, ifp, inp); 125 126 switch (ret) { 127 case PFIL_DROPPED: 128 *error = EACCES; 129 /* FALLTHROUGH */ 130 case PFIL_CONSUMED: 131 return 1; /* Finished */ 132 case PFIL_PASS: 133 *error = 0; 134 } 135 m = *mp; 136 ip = mtod(m, struct ip *); 137 138 /* See if destination IP address was changed by packet filter. */ 139 if (odst.s_addr != ip->ip_dst.s_addr) { 140 m->m_flags |= M_SKIP_FIREWALL; 141 /* If destination is now ourself drop to ip_input(). */ 142 if (in_localip(ip->ip_dst)) { 143 m->m_flags |= M_FASTFWD_OURS; 144 if (m->m_pkthdr.rcvif == NULL) 145 m->m_pkthdr.rcvif = V_loif; 146 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 147 m->m_pkthdr.csum_flags |= 148 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 149 m->m_pkthdr.csum_data = 0xffff; 150 } 151 m->m_pkthdr.csum_flags |= 152 CSUM_IP_CHECKED | CSUM_IP_VALID; 153 #if defined(SCTP) || defined(SCTP_SUPPORT) 154 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 155 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 156 #endif 157 *error = netisr_queue(NETISR_IP, m); 158 return 1; /* Finished */ 159 } 160 161 bzero(dst, sizeof(*dst)); 162 dst->sin_family = AF_INET; 163 dst->sin_len = sizeof(*dst); 164 dst->sin_addr = ip->ip_dst; 165 166 return -1; /* Reloop */ 167 } 168 /* See if fib was changed by packet filter. */ 169 if ((*fibnum) != M_GETFIB(m)) { 170 m->m_flags |= M_SKIP_FIREWALL; 171 *fibnum = M_GETFIB(m); 172 return -1; /* Reloop for FIB change */ 173 } 174 175 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 176 if (m->m_flags & M_FASTFWD_OURS) { 177 if (m->m_pkthdr.rcvif == NULL) 178 m->m_pkthdr.rcvif = V_loif; 179 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 180 m->m_pkthdr.csum_flags |= 181 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 182 m->m_pkthdr.csum_data = 0xffff; 183 } 184 #if defined(SCTP) || defined(SCTP_SUPPORT) 185 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 186 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 187 #endif 188 m->m_pkthdr.csum_flags |= 189 CSUM_IP_CHECKED | CSUM_IP_VALID; 190 191 *error = netisr_queue(NETISR_IP, m); 192 return 1; /* Finished */ 193 } 194 /* Or forward to some other address? */ 195 if ((m->m_flags & M_IP_NEXTHOP) && 196 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) { 197 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 198 m->m_flags |= M_SKIP_FIREWALL; 199 m->m_flags &= ~M_IP_NEXTHOP; 200 m_tag_delete(m, fwd_tag); 201 202 return -1; /* Reloop for CHANGE of dst */ 203 } 204 205 return 0; 206 } 207 208 static int 209 ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m, 210 const struct sockaddr *gw, struct route *ro, bool stamp_tag) 211 { 212 #ifdef KERN_TLS 213 struct ktls_session *tls = NULL; 214 #endif 215 struct m_snd_tag *mst; 216 int error; 217 218 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 219 mst = NULL; 220 221 #ifdef KERN_TLS 222 /* 223 * If this is an unencrypted TLS record, save a reference to 224 * the record. This local reference is used to call 225 * ktls_output_eagain after the mbuf has been freed (thus 226 * dropping the mbuf's reference) in if_output. 227 */ 228 if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) { 229 tls = ktls_hold(m->m_next->m_epg_tls); 230 mst = tls->snd_tag; 231 232 /* 233 * If a TLS session doesn't have a valid tag, it must 234 * have had an earlier ifp mismatch, so drop this 235 * packet. 236 */ 237 if (mst == NULL) { 238 m_freem(m); 239 error = EAGAIN; 240 goto done; 241 } 242 /* 243 * Always stamp tags that include NIC ktls. 244 */ 245 stamp_tag = true; 246 } 247 #endif 248 #ifdef RATELIMIT 249 if (inp != NULL && mst == NULL) { 250 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 || 251 (inp->inp_snd_tag != NULL && 252 inp->inp_snd_tag->ifp != ifp)) 253 in_pcboutput_txrtlmt(inp, ifp, m); 254 255 if (inp->inp_snd_tag != NULL) 256 mst = inp->inp_snd_tag; 257 } 258 #endif 259 if (stamp_tag && mst != NULL) { 260 KASSERT(m->m_pkthdr.rcvif == NULL, 261 ("trying to add a send tag to a forwarded packet")); 262 if (mst->ifp != ifp) { 263 m_freem(m); 264 error = EAGAIN; 265 goto done; 266 } 267 268 /* stamp send tag on mbuf */ 269 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst); 270 m->m_pkthdr.csum_flags |= CSUM_SND_TAG; 271 } 272 273 error = (*ifp->if_output)(ifp, m, gw, ro); 274 275 done: 276 /* Check for route change invalidating send tags. */ 277 #ifdef KERN_TLS 278 if (tls != NULL) { 279 if (error == EAGAIN) 280 error = ktls_output_eagain(inp, tls); 281 ktls_free(tls); 282 } 283 #endif 284 #ifdef RATELIMIT 285 if (error == EAGAIN) 286 in_pcboutput_eagain(inp); 287 #endif 288 return (error); 289 } 290 291 /* rte<>ro_flags translation */ 292 static inline void 293 rt_update_ro_flags(struct route *ro, const struct nhop_object *nh) 294 { 295 int nh_flags = nh->nh_flags; 296 297 ro->ro_flags &= ~ (RT_REJECT|RT_BLACKHOLE|RT_HAS_GW); 298 299 ro->ro_flags |= (nh_flags & NHF_REJECT) ? RT_REJECT : 0; 300 ro->ro_flags |= (nh_flags & NHF_BLACKHOLE) ? RT_BLACKHOLE : 0; 301 ro->ro_flags |= (nh_flags & NHF_GATEWAY) ? RT_HAS_GW : 0; 302 } 303 304 /* 305 * IP output. The packet in mbuf chain m contains a skeletal IP 306 * header (with len, off, ttl, proto, tos, src, dst). 307 * The mbuf chain containing the packet will be freed. 308 * The mbuf opt, if present, will not be freed. 309 * If route ro is present and has ro_rt initialized, route lookup would be 310 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 311 * then result of route lookup is stored in ro->ro_rt. 312 * 313 * In the IP forwarding case, the packet will arrive with options already 314 * inserted, so must have a NULL opt pointer. 315 */ 316 int 317 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags, 318 struct ip_moptions *imo, struct inpcb *inp) 319 { 320 struct ip *ip; 321 struct ifnet *ifp = NULL; /* keep compiler happy */ 322 struct mbuf *m0; 323 int hlen = sizeof (struct ip); 324 int mtu = 0; 325 int error = 0; 326 int vlan_pcp = -1; 327 struct sockaddr_in *dst; 328 const struct sockaddr *gw; 329 struct in_ifaddr *ia = NULL; 330 struct in_addr src; 331 bool isbroadcast; 332 uint16_t ip_len, ip_off; 333 struct route iproute; 334 uint32_t fibnum; 335 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 336 int no_route_but_check_spd = 0; 337 #endif 338 339 M_ASSERTPKTHDR(m); 340 NET_EPOCH_ASSERT(); 341 342 if (inp != NULL) { 343 INP_LOCK_ASSERT(inp); 344 M_SETFIB(m, inp->inp_inc.inc_fibnum); 345 if ((flags & IP_NODEFAULTFLOWID) == 0) { 346 m->m_pkthdr.flowid = inp->inp_flowid; 347 M_HASHTYPE_SET(m, inp->inp_flowtype); 348 } 349 if ((inp->inp_flags2 & INP_2PCP_SET) != 0) 350 vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >> 351 INP_2PCP_SHIFT; 352 #ifdef NUMA 353 m->m_pkthdr.numa_domain = inp->inp_numa_domain; 354 #endif 355 } 356 357 if (opt) { 358 int len = 0; 359 m = ip_insertoptions(m, opt, &len); 360 if (len != 0) 361 hlen = len; /* ip->ip_hl is updated above */ 362 } 363 ip = mtod(m, struct ip *); 364 ip_len = ntohs(ip->ip_len); 365 ip_off = ntohs(ip->ip_off); 366 367 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 368 ip->ip_v = IPVERSION; 369 ip->ip_hl = hlen >> 2; 370 ip_fillid(ip, V_ip_random_id); 371 } else { 372 /* Header already set, fetch hlen from there */ 373 hlen = ip->ip_hl << 2; 374 } 375 if ((flags & IP_FORWARDING) == 0) 376 IPSTAT_INC(ips_localout); 377 378 /* 379 * dst/gw handling: 380 * 381 * gw is readonly but can point either to dst OR rt_gateway, 382 * therefore we need restore gw if we're redoing lookup. 383 */ 384 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 385 if (ro == NULL) { 386 ro = &iproute; 387 bzero(ro, sizeof (*ro)); 388 } 389 dst = (struct sockaddr_in *)&ro->ro_dst; 390 if (ro->ro_nh == NULL) { 391 dst->sin_family = AF_INET; 392 dst->sin_len = sizeof(*dst); 393 dst->sin_addr = ip->ip_dst; 394 } 395 gw = (const struct sockaddr *)dst; 396 again: 397 /* 398 * Validate route against routing table additions; 399 * a better/more specific route might have been added. 400 */ 401 if (inp != NULL && ro->ro_nh != NULL) 402 NH_VALIDATE(ro, &inp->inp_rt_cookie, fibnum); 403 /* 404 * If there is a cached route, 405 * check that it is to the same destination 406 * and is still up. If not, free it and try again. 407 * The address family should also be checked in case of sharing the 408 * cache with IPv6. 409 * Also check whether routing cache needs invalidation. 410 */ 411 if (ro->ro_nh != NULL && 412 ((!NH_IS_VALID(ro->ro_nh)) || dst->sin_family != AF_INET || 413 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) 414 RO_INVALIDATE_CACHE(ro); 415 ia = NULL; 416 /* 417 * If routing to interface only, short circuit routing lookup. 418 * The use of an all-ones broadcast address implies this; an 419 * interface is specified by the broadcast address of an interface, 420 * or the destination address of a ptp interface. 421 */ 422 if (flags & IP_SENDONES) { 423 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst), 424 M_GETFIB(m)))) == NULL && 425 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 426 M_GETFIB(m)))) == NULL) { 427 IPSTAT_INC(ips_noroute); 428 error = ENETUNREACH; 429 goto bad; 430 } 431 ip->ip_dst.s_addr = INADDR_BROADCAST; 432 dst->sin_addr = ip->ip_dst; 433 ifp = ia->ia_ifp; 434 mtu = ifp->if_mtu; 435 ip->ip_ttl = 1; 436 isbroadcast = true; 437 src = IA_SIN(ia)->sin_addr; 438 } else if (flags & IP_ROUTETOIF) { 439 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 440 M_GETFIB(m)))) == NULL && 441 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0, 442 M_GETFIB(m)))) == NULL) { 443 IPSTAT_INC(ips_noroute); 444 error = ENETUNREACH; 445 goto bad; 446 } 447 ifp = ia->ia_ifp; 448 mtu = ifp->if_mtu; 449 ip->ip_ttl = 1; 450 isbroadcast = ifp->if_flags & IFF_BROADCAST ? 451 (in_broadcast(ip->ip_dst) || 452 in_ifaddr_broadcast(dst->sin_addr, ia)) : 0; 453 src = IA_SIN(ia)->sin_addr; 454 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 455 imo != NULL && imo->imo_multicast_ifp != NULL) { 456 /* 457 * Bypass the normal routing lookup for multicast 458 * packets if the interface is specified. 459 */ 460 ifp = imo->imo_multicast_ifp; 461 mtu = ifp->if_mtu; 462 IFP_TO_IA(ifp, ia); 463 isbroadcast = false; 464 /* Interface may have no addresses. */ 465 if (ia != NULL) 466 src = IA_SIN(ia)->sin_addr; 467 else 468 src.s_addr = INADDR_ANY; 469 } else if (ro != &iproute) { 470 if (ro->ro_nh == NULL) { 471 /* 472 * We want to do any cloning requested by the link 473 * layer, as this is probably required in all cases 474 * for correct operation (as it is for ARP). 475 */ 476 uint32_t flowid; 477 flowid = m->m_pkthdr.flowid; 478 ro->ro_nh = fib4_lookup(fibnum, dst->sin_addr, 0, 479 NHR_REF, flowid); 480 481 if (ro->ro_nh == NULL || (!NH_IS_VALID(ro->ro_nh))) { 482 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 483 /* 484 * There is no route for this packet, but it is 485 * possible that a matching SPD entry exists. 486 */ 487 no_route_but_check_spd = 1; 488 goto sendit; 489 #endif 490 IPSTAT_INC(ips_noroute); 491 error = EHOSTUNREACH; 492 goto bad; 493 } 494 } 495 struct nhop_object *nh = ro->ro_nh; 496 497 ia = ifatoia(nh->nh_ifa); 498 ifp = nh->nh_ifp; 499 counter_u64_add(nh->nh_pksent, 1); 500 rt_update_ro_flags(ro, nh); 501 if (nh->nh_flags & NHF_GATEWAY) 502 gw = &nh->gw_sa; 503 if (nh->nh_flags & NHF_HOST) 504 isbroadcast = (nh->nh_flags & NHF_BROADCAST); 505 else if ((ifp->if_flags & IFF_BROADCAST) && 506 (gw->sa_family == AF_INET)) 507 isbroadcast = in_broadcast(ip->ip_dst) || 508 in_ifaddr_broadcast( 509 ((const struct sockaddr_in *)gw)->sin_addr, ia); 510 else 511 isbroadcast = false; 512 mtu = nh->nh_mtu; 513 src = IA_SIN(ia)->sin_addr; 514 } else { 515 struct nhop_object *nh; 516 517 nh = fib4_lookup(M_GETFIB(m), dst->sin_addr, 0, NHR_NONE, 518 m->m_pkthdr.flowid); 519 if (nh == NULL) { 520 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 521 /* 522 * There is no route for this packet, but it is 523 * possible that a matching SPD entry exists. 524 */ 525 no_route_but_check_spd = 1; 526 goto sendit; 527 #endif 528 IPSTAT_INC(ips_noroute); 529 error = EHOSTUNREACH; 530 goto bad; 531 } 532 ifp = nh->nh_ifp; 533 mtu = nh->nh_mtu; 534 rt_update_ro_flags(ro, nh); 535 if (nh->nh_flags & NHF_GATEWAY) 536 gw = &nh->gw_sa; 537 ia = ifatoia(nh->nh_ifa); 538 src = IA_SIN(ia)->sin_addr; 539 isbroadcast = ((nh->nh_flags & (NHF_HOST | NHF_BROADCAST)) == 540 (NHF_HOST | NHF_BROADCAST)) || 541 ((ifp->if_flags & IFF_BROADCAST) && 542 (gw->sa_family == AF_INET) && 543 (in_broadcast(ip->ip_dst) || in_ifaddr_broadcast( 544 ((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 int vif; 565 566 vif = imo->imo_multicast_vif; 567 ip->ip_ttl = imo->imo_multicast_ttl; 568 if (vif != -1) 569 ip->ip_src.s_addr = ip_mcast_src ? 570 ip_mcast_src(fibnum, vif) : INADDR_ANY; 571 } else 572 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 573 /* 574 * Confirm that the outgoing interface supports multicast. 575 */ 576 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 577 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 578 IPSTAT_INC(ips_noroute); 579 error = ENETUNREACH; 580 goto bad; 581 } 582 } 583 /* 584 * If source address not specified yet, use address 585 * of outgoing interface. 586 */ 587 if (ip->ip_src.s_addr == INADDR_ANY) 588 ip->ip_src = src; 589 590 if ((imo == NULL && in_mcast_loop) || 591 (imo && imo->imo_multicast_loop)) { 592 /* 593 * Loop back multicast datagram if not expressly 594 * forbidden to do so, even if we are not a member 595 * of the group; ip_input() will filter it later, 596 * thus deferring a hash lookup and mutex acquisition 597 * at the expense of a cheap copy using m_copym(). 598 */ 599 ip_mloopback(ifp, m, hlen); 600 } else { 601 /* 602 * If we are acting as a multicast router, perform 603 * multicast forwarding as if the packet had just 604 * arrived on the interface to which we are about 605 * to send. The multicast forwarding function 606 * recursively calls this function, using the 607 * IP_FORWARDING flag to prevent infinite recursion. 608 * 609 * Multicasts that are looped back by ip_mloopback(), 610 * above, will be forwarded by the ip_input() routine, 611 * if necessary. 612 */ 613 if (V_ip_mrouting_enabled && 614 (flags & IP_FORWARDING) == 0) { 615 /* 616 * If rsvp daemon is not running, do not 617 * set ip_moptions. This ensures that the packet 618 * is multicast and not just sent down one link 619 * as prescribed by rsvpd. 620 */ 621 if (!V_rsvp_on) 622 imo = NULL; 623 if (ip_mforward && 624 ip_mforward(ip, ifp, m, imo) != 0) { 625 m_freem(m); 626 goto done; 627 } 628 } 629 } 630 631 /* 632 * Multicasts with a time-to-live of zero may be looped- 633 * back, above, but must not be transmitted on a network. 634 * Also, multicasts addressed to the loopback interface 635 * are not sent -- the above call to ip_mloopback() will 636 * loop back a copy. ip_input() will drop the copy if 637 * this host does not belong to the destination group on 638 * the loopback interface. 639 */ 640 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 641 m_freem(m); 642 goto done; 643 } 644 645 goto sendit; 646 } 647 648 /* 649 * If the source address is not specified yet, use the address 650 * of the outoing interface. 651 */ 652 if (ip->ip_src.s_addr == INADDR_ANY) 653 ip->ip_src = src; 654 655 /* 656 * Look for broadcast address and 657 * verify user is allowed to send 658 * such a packet. 659 */ 660 if (isbroadcast) { 661 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 662 error = EADDRNOTAVAIL; 663 goto bad; 664 } 665 if ((flags & IP_ALLOWBROADCAST) == 0) { 666 error = EACCES; 667 goto bad; 668 } 669 /* don't allow broadcast messages to be fragmented */ 670 if (ip_len > mtu) { 671 error = EMSGSIZE; 672 goto bad; 673 } 674 m->m_flags |= M_BCAST; 675 } else { 676 m->m_flags &= ~M_BCAST; 677 } 678 679 sendit: 680 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 681 if (IPSEC_ENABLED(ipv4)) { 682 struct ip ip_hdr; 683 684 if ((error = IPSEC_OUTPUT(ipv4, ifp, m, inp, mtu)) != 0) { 685 if (error == EINPROGRESS) 686 error = 0; 687 goto done; 688 } 689 690 /* Update variables that are affected by ipsec4_output(). */ 691 m_copydata(m, 0, sizeof(ip_hdr), (char *)&ip_hdr); 692 hlen = ip_hdr.ip_hl << 2; 693 } 694 695 /* 696 * Check if there was a route for this packet; return error if not. 697 */ 698 if (no_route_but_check_spd) { 699 IPSTAT_INC(ips_noroute); 700 error = EHOSTUNREACH; 701 goto bad; 702 } 703 #endif /* IPSEC */ 704 705 /* Jump over all PFIL processing if hooks are not active. */ 706 if (PFIL_HOOKED_OUT(V_inet_pfil_head)) { 707 switch (ip_output_pfil(&m, ifp, flags, inp, dst, &fibnum, 708 &error)) { 709 case 1: /* Finished */ 710 goto done; 711 712 case 0: /* Continue normally */ 713 ip = mtod(m, struct ip *); 714 ip_len = ntohs(ip->ip_len); 715 break; 716 717 case -1: /* Need to try again */ 718 /* Reset everything for a new round */ 719 if (ro != NULL) { 720 RO_NHFREE(ro); 721 ro->ro_prepend = NULL; 722 } 723 gw = (const struct sockaddr *)dst; 724 ip = mtod(m, struct ip *); 725 goto again; 726 } 727 } 728 729 if (vlan_pcp > -1) 730 EVL_APPLY_PRI(m, vlan_pcp); 731 732 /* IN_LOOPBACK must not appear on the wire - RFC1122. */ 733 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 734 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 735 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 736 IPSTAT_INC(ips_badaddr); 737 error = EADDRNOTAVAIL; 738 goto bad; 739 } 740 } 741 742 /* Ensure the packet data is mapped if the interface requires it. */ 743 if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) { 744 struct mbuf *m1; 745 746 error = mb_unmapped_to_ext(m, &m1); 747 if (error != 0) { 748 if (error == EINVAL) { 749 if_printf(ifp, "TLS packet\n"); 750 /* XXXKIB */ 751 } else if (error == ENOMEM) { 752 error = ENOBUFS; 753 } 754 IPSTAT_INC(ips_odropped); 755 goto done; 756 } else { 757 m = m1; 758 } 759 } 760 761 m->m_pkthdr.csum_flags |= CSUM_IP; 762 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 763 in_delayed_cksum(m); 764 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 765 } 766 #if defined(SCTP) || defined(SCTP_SUPPORT) 767 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 768 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 769 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 770 } 771 #endif 772 773 /* 774 * If small enough for interface, or the interface will take 775 * care of the fragmentation for us, we can just send directly. 776 * Note that if_vxlan could have requested TSO even though the outer 777 * frame is UDP. It is correct to not fragment such datagrams and 778 * instead just pass them on to the driver. 779 */ 780 if (ip_len <= mtu || 781 (m->m_pkthdr.csum_flags & ifp->if_hwassist & 782 (CSUM_TSO | CSUM_INNER_TSO)) != 0) { 783 ip->ip_sum = 0; 784 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 785 ip->ip_sum = in_cksum(m, hlen); 786 m->m_pkthdr.csum_flags &= ~CSUM_IP; 787 } 788 789 /* 790 * Record statistics for this interface address. 791 * With CSUM_TSO the byte/packet count will be slightly 792 * incorrect because we count the IP+TCP headers only 793 * once instead of for every generated packet. 794 */ 795 if (!(flags & IP_FORWARDING) && ia) { 796 if (m->m_pkthdr.csum_flags & 797 (CSUM_TSO | CSUM_INNER_TSO)) 798 counter_u64_add(ia->ia_ifa.ifa_opackets, 799 m->m_pkthdr.len / m->m_pkthdr.tso_segsz); 800 else 801 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 802 803 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len); 804 } 805 #ifdef MBUF_STRESS_TEST 806 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 807 m = m_fragment(m, M_NOWAIT, mbuf_frag_size); 808 #endif 809 /* 810 * Reset layer specific mbuf flags 811 * to avoid confusing lower layers. 812 */ 813 m_clrprotoflags(m); 814 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 815 error = ip_output_send(inp, ifp, m, gw, ro, 816 (flags & IP_NO_SND_TAG_RL) ? false : true); 817 goto done; 818 } 819 820 /* Balk when DF bit is set or the interface didn't support TSO. */ 821 if ((ip_off & IP_DF) || 822 (m->m_pkthdr.csum_flags & (CSUM_TSO | CSUM_INNER_TSO))) { 823 error = EMSGSIZE; 824 IPSTAT_INC(ips_cantfrag); 825 goto bad; 826 } 827 828 /* 829 * Too large for interface; fragment if possible. If successful, 830 * on return, m will point to a list of packets to be sent. 831 */ 832 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist); 833 if (error) 834 goto bad; 835 for (; m; m = m0) { 836 m0 = m->m_nextpkt; 837 m->m_nextpkt = 0; 838 if (error == 0) { 839 /* Record statistics for this interface address. */ 840 if (ia != NULL) { 841 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 842 counter_u64_add(ia->ia_ifa.ifa_obytes, 843 m->m_pkthdr.len); 844 } 845 /* 846 * Reset layer specific mbuf flags 847 * to avoid confusing upper layers. 848 */ 849 m_clrprotoflags(m); 850 851 IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp, 852 mtod(m, struct ip *), NULL); 853 error = ip_output_send(inp, ifp, m, gw, ro, true); 854 } else 855 m_freem(m); 856 } 857 858 if (error == 0) 859 IPSTAT_INC(ips_fragmented); 860 861 done: 862 return (error); 863 bad: 864 m_freem(m); 865 goto done; 866 } 867 868 /* 869 * Create a chain of fragments which fit the given mtu. m_frag points to the 870 * mbuf to be fragmented; on return it points to the chain with the fragments. 871 * Return 0 if no error. If error, m_frag may contain a partially built 872 * chain of fragments that should be freed by the caller. 873 * 874 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist) 875 */ 876 int 877 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 878 u_long if_hwassist_flags) 879 { 880 int error = 0; 881 int hlen = ip->ip_hl << 2; 882 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */ 883 int off; 884 struct mbuf *m0 = *m_frag; /* the original packet */ 885 int firstlen; 886 struct mbuf **mnext; 887 int nfrags; 888 uint16_t ip_len, ip_off; 889 890 ip_len = ntohs(ip->ip_len); 891 ip_off = ntohs(ip->ip_off); 892 893 /* 894 * Packet shall not have "Don't Fragment" flag and have at least 8 895 * bytes of payload. 896 */ 897 if (__predict_false((ip_off & IP_DF) || len < 8)) { 898 IPSTAT_INC(ips_cantfrag); 899 return (EMSGSIZE); 900 } 901 902 /* 903 * If the interface will not calculate checksums on 904 * fragmented packets, then do it here. 905 */ 906 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 907 in_delayed_cksum(m0); 908 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 909 } 910 #if defined(SCTP) || defined(SCTP_SUPPORT) 911 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) { 912 sctp_delayed_cksum(m0, hlen); 913 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 914 } 915 #endif 916 if (len > PAGE_SIZE) { 917 /* 918 * Fragment large datagrams such that each segment 919 * contains a multiple of PAGE_SIZE amount of data, 920 * plus headers. This enables a receiver to perform 921 * page-flipping zero-copy optimizations. 922 * 923 * XXX When does this help given that sender and receiver 924 * could have different page sizes, and also mtu could 925 * be less than the receiver's page size ? 926 */ 927 int newlen; 928 929 off = MIN(mtu, m0->m_pkthdr.len); 930 931 /* 932 * firstlen (off - hlen) must be aligned on an 933 * 8-byte boundary 934 */ 935 if (off < hlen) 936 goto smart_frag_failure; 937 off = ((off - hlen) & ~7) + hlen; 938 newlen = (~PAGE_MASK) & mtu; 939 if ((newlen + sizeof (struct ip)) > mtu) { 940 /* we failed, go back the default */ 941 smart_frag_failure: 942 newlen = len; 943 off = hlen + len; 944 } 945 len = newlen; 946 947 } else { 948 off = hlen + len; 949 } 950 951 firstlen = off - hlen; 952 mnext = &m0->m_nextpkt; /* pointer to next packet */ 953 954 /* 955 * Loop through length of segment after first fragment, 956 * make new header and copy data of each part and link onto chain. 957 * Here, m0 is the original packet, m is the fragment being created. 958 * The fragments are linked off the m_nextpkt of the original 959 * packet, which after processing serves as the first fragment. 960 */ 961 for (nfrags = 1; off < ip_len; off += len, nfrags++) { 962 struct ip *mhip; /* ip header on the fragment */ 963 struct mbuf *m; 964 int mhlen = sizeof (struct ip); 965 966 m = m_gethdr(M_NOWAIT, MT_DATA); 967 if (m == NULL) { 968 error = ENOBUFS; 969 IPSTAT_INC(ips_odropped); 970 goto done; 971 } 972 /* 973 * Make sure the complete packet header gets copied 974 * from the originating mbuf to the newly created 975 * mbuf. This also ensures that existing firewall 976 * classification(s), VLAN tags and so on get copied 977 * to the resulting fragmented packet(s): 978 */ 979 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) { 980 m_free(m); 981 error = ENOBUFS; 982 IPSTAT_INC(ips_odropped); 983 goto done; 984 } 985 /* 986 * In the first mbuf, leave room for the link header, then 987 * copy the original IP header including options. The payload 988 * goes into an additional mbuf chain returned by m_copym(). 989 */ 990 m->m_data += max_linkhdr; 991 mhip = mtod(m, struct ip *); 992 *mhip = *ip; 993 if (hlen > sizeof (struct ip)) { 994 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 995 mhip->ip_v = IPVERSION; 996 mhip->ip_hl = mhlen >> 2; 997 } 998 m->m_len = mhlen; 999 /* XXX do we need to add ip_off below ? */ 1000 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1001 if (off + len >= ip_len) 1002 len = ip_len - off; 1003 else 1004 mhip->ip_off |= IP_MF; 1005 mhip->ip_len = htons((u_short)(len + mhlen)); 1006 m->m_next = m_copym(m0, off, len, M_NOWAIT); 1007 if (m->m_next == NULL) { /* copy failed */ 1008 m_free(m); 1009 error = ENOBUFS; /* ??? */ 1010 IPSTAT_INC(ips_odropped); 1011 goto done; 1012 } 1013 m->m_pkthdr.len = mhlen + len; 1014 #ifdef MAC 1015 mac_netinet_fragment(m0, m); 1016 #endif 1017 mhip->ip_off = htons(mhip->ip_off); 1018 mhip->ip_sum = 0; 1019 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 1020 mhip->ip_sum = in_cksum(m, mhlen); 1021 m->m_pkthdr.csum_flags &= ~CSUM_IP; 1022 } 1023 *mnext = m; 1024 mnext = &m->m_nextpkt; 1025 } 1026 IPSTAT_ADD(ips_ofragments, nfrags); 1027 1028 /* 1029 * Update first fragment by trimming what's been copied out 1030 * and updating header. 1031 */ 1032 m_adj(m0, hlen + firstlen - ip_len); 1033 m0->m_pkthdr.len = hlen + firstlen; 1034 ip->ip_len = htons((u_short)m0->m_pkthdr.len); 1035 ip->ip_off = htons(ip_off | IP_MF); 1036 ip->ip_sum = 0; 1037 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 1038 ip->ip_sum = in_cksum(m0, hlen); 1039 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 1040 } 1041 1042 done: 1043 *m_frag = m0; 1044 return error; 1045 } 1046 1047 void 1048 in_delayed_cksum_o(struct mbuf *m, uint16_t iph_offset) 1049 { 1050 struct ip *ip; 1051 struct udphdr *uh; 1052 uint16_t cklen, csum, offset; 1053 1054 ip = (struct ip *)mtodo(m, iph_offset); 1055 offset = iph_offset + (ip->ip_hl << 2); 1056 1057 if (m->m_pkthdr.csum_flags & CSUM_UDP) { 1058 /* if udp header is not in the first mbuf copy udplen */ 1059 if (offset + sizeof(struct udphdr) > m->m_len) { 1060 m_copydata(m, offset + offsetof(struct udphdr, 1061 uh_ulen), sizeof(cklen), (caddr_t)&cklen); 1062 cklen = ntohs(cklen); 1063 } else { 1064 uh = (struct udphdr *)mtodo(m, offset); 1065 cklen = ntohs(uh->uh_ulen); 1066 } 1067 csum = in_cksum_skip(m, cklen + offset, offset); 1068 if (csum == 0) 1069 csum = 0xffff; 1070 } else { 1071 cklen = ntohs(ip->ip_len) - (ip->ip_hl << 2); 1072 csum = in_cksum_skip(m, cklen + offset, offset); 1073 } 1074 offset += m->m_pkthdr.csum_data; /* checksum offset */ 1075 1076 if (offset + sizeof(csum) > m->m_len) 1077 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum); 1078 else 1079 *(u_short *)mtodo(m, offset) = csum; 1080 } 1081 1082 void 1083 in_delayed_cksum(struct mbuf *m) 1084 { 1085 1086 in_delayed_cksum_o(m, 0); 1087 } 1088 1089 /* 1090 * IP socket option processing. 1091 */ 1092 int 1093 ip_ctloutput(struct socket *so, struct sockopt *sopt) 1094 { 1095 struct inpcb *inp = sotoinpcb(so); 1096 int error, optval; 1097 #ifdef RSS 1098 uint32_t rss_bucket; 1099 int retval; 1100 #endif 1101 1102 error = optval = 0; 1103 if (sopt->sopt_level != IPPROTO_IP) { 1104 error = EINVAL; 1105 1106 if (sopt->sopt_level == SOL_SOCKET && 1107 sopt->sopt_dir == SOPT_SET) { 1108 switch (sopt->sopt_name) { 1109 case SO_SETFIB: 1110 error = sooptcopyin(sopt, &optval, 1111 sizeof(optval), sizeof(optval)); 1112 if (error != 0) 1113 break; 1114 1115 INP_WLOCK(inp); 1116 if ((inp->inp_flags & INP_BOUNDFIB) != 0 && 1117 optval != so->so_fibnum) { 1118 INP_WUNLOCK(inp); 1119 error = EISCONN; 1120 break; 1121 } 1122 error = sosetfib(inp->inp_socket, optval); 1123 if (error == 0) 1124 inp->inp_inc.inc_fibnum = optval; 1125 INP_WUNLOCK(inp); 1126 break; 1127 case SO_MAX_PACING_RATE: 1128 #ifdef RATELIMIT 1129 INP_WLOCK(inp); 1130 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 1131 INP_WUNLOCK(inp); 1132 error = 0; 1133 #else 1134 error = EOPNOTSUPP; 1135 #endif 1136 break; 1137 default: 1138 break; 1139 } 1140 } 1141 return (error); 1142 } 1143 1144 switch (sopt->sopt_dir) { 1145 case SOPT_SET: 1146 switch (sopt->sopt_name) { 1147 case IP_OPTIONS: 1148 #ifdef notyet 1149 case IP_RETOPTS: 1150 #endif 1151 { 1152 struct mbuf *m; 1153 if (sopt->sopt_valsize > MLEN) { 1154 error = EMSGSIZE; 1155 break; 1156 } 1157 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA); 1158 if (m == NULL) { 1159 error = ENOBUFS; 1160 break; 1161 } 1162 m->m_len = sopt->sopt_valsize; 1163 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 1164 m->m_len); 1165 if (error) { 1166 m_free(m); 1167 break; 1168 } 1169 INP_WLOCK(inp); 1170 error = ip_pcbopts(inp, sopt->sopt_name, m); 1171 INP_WUNLOCK(inp); 1172 return (error); 1173 } 1174 1175 case IP_BINDANY: 1176 if (sopt->sopt_td != NULL) { 1177 error = priv_check(sopt->sopt_td, 1178 PRIV_NETINET_BINDANY); 1179 if (error) 1180 break; 1181 } 1182 /* FALLTHROUGH */ 1183 case IP_TOS: 1184 case IP_TTL: 1185 case IP_MINTTL: 1186 case IP_RECVOPTS: 1187 case IP_RECVRETOPTS: 1188 case IP_ORIGDSTADDR: 1189 case IP_RECVDSTADDR: 1190 case IP_RECVTTL: 1191 case IP_RECVIF: 1192 case IP_ONESBCAST: 1193 case IP_DONTFRAG: 1194 case IP_RECVTOS: 1195 case IP_RECVFLOWID: 1196 #ifdef RSS 1197 case IP_RECVRSSBUCKETID: 1198 #endif 1199 case IP_VLAN_PCP: 1200 error = sooptcopyin(sopt, &optval, sizeof optval, 1201 sizeof optval); 1202 if (error) 1203 break; 1204 1205 switch (sopt->sopt_name) { 1206 case IP_TOS: 1207 inp->inp_ip_tos = optval; 1208 break; 1209 1210 case IP_TTL: 1211 inp->inp_ip_ttl = optval; 1212 break; 1213 1214 case IP_MINTTL: 1215 if (optval >= 0 && optval <= MAXTTL) 1216 inp->inp_ip_minttl = optval; 1217 else 1218 error = EINVAL; 1219 break; 1220 1221 #define OPTSET(bit) do { \ 1222 INP_WLOCK(inp); \ 1223 if (optval) \ 1224 inp->inp_flags |= bit; \ 1225 else \ 1226 inp->inp_flags &= ~bit; \ 1227 INP_WUNLOCK(inp); \ 1228 } while (0) 1229 1230 #define OPTSET2(bit, val) do { \ 1231 INP_WLOCK(inp); \ 1232 if (val) \ 1233 inp->inp_flags2 |= bit; \ 1234 else \ 1235 inp->inp_flags2 &= ~bit; \ 1236 INP_WUNLOCK(inp); \ 1237 } while (0) 1238 1239 case IP_RECVOPTS: 1240 OPTSET(INP_RECVOPTS); 1241 break; 1242 1243 case IP_RECVRETOPTS: 1244 OPTSET(INP_RECVRETOPTS); 1245 break; 1246 1247 case IP_RECVDSTADDR: 1248 OPTSET(INP_RECVDSTADDR); 1249 break; 1250 1251 case IP_ORIGDSTADDR: 1252 OPTSET2(INP_ORIGDSTADDR, optval); 1253 break; 1254 1255 case IP_RECVTTL: 1256 OPTSET(INP_RECVTTL); 1257 break; 1258 1259 case IP_RECVIF: 1260 OPTSET(INP_RECVIF); 1261 break; 1262 1263 case IP_ONESBCAST: 1264 OPTSET(INP_ONESBCAST); 1265 break; 1266 case IP_DONTFRAG: 1267 OPTSET(INP_DONTFRAG); 1268 break; 1269 case IP_BINDANY: 1270 OPTSET(INP_BINDANY); 1271 break; 1272 case IP_RECVTOS: 1273 OPTSET(INP_RECVTOS); 1274 break; 1275 case IP_RECVFLOWID: 1276 OPTSET2(INP_RECVFLOWID, optval); 1277 break; 1278 #ifdef RSS 1279 case IP_RECVRSSBUCKETID: 1280 OPTSET2(INP_RECVRSSBUCKETID, optval); 1281 break; 1282 #endif 1283 case IP_VLAN_PCP: 1284 if ((optval >= -1) && (optval <= 1285 (INP_2PCP_MASK >> INP_2PCP_SHIFT))) { 1286 if (optval == -1) { 1287 INP_WLOCK(inp); 1288 inp->inp_flags2 &= 1289 ~(INP_2PCP_SET | 1290 INP_2PCP_MASK); 1291 INP_WUNLOCK(inp); 1292 } else { 1293 INP_WLOCK(inp); 1294 inp->inp_flags2 |= 1295 INP_2PCP_SET; 1296 inp->inp_flags2 &= 1297 ~INP_2PCP_MASK; 1298 inp->inp_flags2 |= 1299 optval << INP_2PCP_SHIFT; 1300 INP_WUNLOCK(inp); 1301 } 1302 } else 1303 error = EINVAL; 1304 break; 1305 } 1306 break; 1307 #undef OPTSET 1308 #undef OPTSET2 1309 1310 /* 1311 * Multicast socket options are processed by the in_mcast 1312 * module. 1313 */ 1314 case IP_MULTICAST_IF: 1315 case IP_MULTICAST_VIF: 1316 case IP_MULTICAST_TTL: 1317 case IP_MULTICAST_LOOP: 1318 case IP_ADD_MEMBERSHIP: 1319 case IP_DROP_MEMBERSHIP: 1320 case IP_ADD_SOURCE_MEMBERSHIP: 1321 case IP_DROP_SOURCE_MEMBERSHIP: 1322 case IP_BLOCK_SOURCE: 1323 case IP_UNBLOCK_SOURCE: 1324 case IP_MSFILTER: 1325 case MCAST_JOIN_GROUP: 1326 case MCAST_LEAVE_GROUP: 1327 case MCAST_JOIN_SOURCE_GROUP: 1328 case MCAST_LEAVE_SOURCE_GROUP: 1329 case MCAST_BLOCK_SOURCE: 1330 case MCAST_UNBLOCK_SOURCE: 1331 error = inp_setmoptions(inp, sopt); 1332 break; 1333 1334 case IP_PORTRANGE: 1335 error = sooptcopyin(sopt, &optval, sizeof optval, 1336 sizeof optval); 1337 if (error) 1338 break; 1339 1340 INP_WLOCK(inp); 1341 switch (optval) { 1342 case IP_PORTRANGE_DEFAULT: 1343 inp->inp_flags &= ~(INP_LOWPORT); 1344 inp->inp_flags &= ~(INP_HIGHPORT); 1345 break; 1346 1347 case IP_PORTRANGE_HIGH: 1348 inp->inp_flags &= ~(INP_LOWPORT); 1349 inp->inp_flags |= INP_HIGHPORT; 1350 break; 1351 1352 case IP_PORTRANGE_LOW: 1353 inp->inp_flags &= ~(INP_HIGHPORT); 1354 inp->inp_flags |= INP_LOWPORT; 1355 break; 1356 1357 default: 1358 error = EINVAL; 1359 break; 1360 } 1361 INP_WUNLOCK(inp); 1362 break; 1363 1364 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1365 case IP_IPSEC_POLICY: 1366 if (IPSEC_ENABLED(ipv4)) { 1367 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1368 break; 1369 } 1370 /* FALLTHROUGH */ 1371 #endif /* IPSEC */ 1372 1373 default: 1374 error = ENOPROTOOPT; 1375 break; 1376 } 1377 break; 1378 1379 case SOPT_GET: 1380 switch (sopt->sopt_name) { 1381 case IP_OPTIONS: 1382 case IP_RETOPTS: 1383 INP_RLOCK(inp); 1384 if (inp->inp_options) { 1385 struct mbuf *options; 1386 1387 options = m_copym(inp->inp_options, 0, 1388 M_COPYALL, M_NOWAIT); 1389 INP_RUNLOCK(inp); 1390 if (options != NULL) { 1391 error = sooptcopyout(sopt, 1392 mtod(options, char *), 1393 options->m_len); 1394 m_freem(options); 1395 } else 1396 error = ENOMEM; 1397 } else { 1398 INP_RUNLOCK(inp); 1399 sopt->sopt_valsize = 0; 1400 } 1401 break; 1402 1403 case IP_TOS: 1404 case IP_TTL: 1405 case IP_MINTTL: 1406 case IP_RECVOPTS: 1407 case IP_RECVRETOPTS: 1408 case IP_ORIGDSTADDR: 1409 case IP_RECVDSTADDR: 1410 case IP_RECVTTL: 1411 case IP_RECVIF: 1412 case IP_PORTRANGE: 1413 case IP_ONESBCAST: 1414 case IP_DONTFRAG: 1415 case IP_BINDANY: 1416 case IP_RECVTOS: 1417 case IP_FLOWID: 1418 case IP_FLOWTYPE: 1419 case IP_RECVFLOWID: 1420 #ifdef RSS 1421 case IP_RSSBUCKETID: 1422 case IP_RECVRSSBUCKETID: 1423 #endif 1424 case IP_VLAN_PCP: 1425 switch (sopt->sopt_name) { 1426 case IP_TOS: 1427 optval = inp->inp_ip_tos; 1428 break; 1429 1430 case IP_TTL: 1431 optval = inp->inp_ip_ttl; 1432 break; 1433 1434 case IP_MINTTL: 1435 optval = inp->inp_ip_minttl; 1436 break; 1437 1438 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1439 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0) 1440 1441 case IP_RECVOPTS: 1442 optval = OPTBIT(INP_RECVOPTS); 1443 break; 1444 1445 case IP_RECVRETOPTS: 1446 optval = OPTBIT(INP_RECVRETOPTS); 1447 break; 1448 1449 case IP_RECVDSTADDR: 1450 optval = OPTBIT(INP_RECVDSTADDR); 1451 break; 1452 1453 case IP_ORIGDSTADDR: 1454 optval = OPTBIT2(INP_ORIGDSTADDR); 1455 break; 1456 1457 case IP_RECVTTL: 1458 optval = OPTBIT(INP_RECVTTL); 1459 break; 1460 1461 case IP_RECVIF: 1462 optval = OPTBIT(INP_RECVIF); 1463 break; 1464 1465 case IP_PORTRANGE: 1466 if (inp->inp_flags & INP_HIGHPORT) 1467 optval = IP_PORTRANGE_HIGH; 1468 else if (inp->inp_flags & INP_LOWPORT) 1469 optval = IP_PORTRANGE_LOW; 1470 else 1471 optval = 0; 1472 break; 1473 1474 case IP_ONESBCAST: 1475 optval = OPTBIT(INP_ONESBCAST); 1476 break; 1477 case IP_DONTFRAG: 1478 optval = OPTBIT(INP_DONTFRAG); 1479 break; 1480 case IP_BINDANY: 1481 optval = OPTBIT(INP_BINDANY); 1482 break; 1483 case IP_RECVTOS: 1484 optval = OPTBIT(INP_RECVTOS); 1485 break; 1486 case IP_FLOWID: 1487 optval = inp->inp_flowid; 1488 break; 1489 case IP_FLOWTYPE: 1490 optval = inp->inp_flowtype; 1491 break; 1492 case IP_RECVFLOWID: 1493 optval = OPTBIT2(INP_RECVFLOWID); 1494 break; 1495 #ifdef RSS 1496 case IP_RSSBUCKETID: 1497 retval = rss_hash2bucket(inp->inp_flowid, 1498 inp->inp_flowtype, 1499 &rss_bucket); 1500 if (retval == 0) 1501 optval = rss_bucket; 1502 else 1503 error = EINVAL; 1504 break; 1505 case IP_RECVRSSBUCKETID: 1506 optval = OPTBIT2(INP_RECVRSSBUCKETID); 1507 break; 1508 #endif 1509 case IP_VLAN_PCP: 1510 if (OPTBIT2(INP_2PCP_SET)) { 1511 optval = (inp->inp_flags2 & 1512 INP_2PCP_MASK) >> INP_2PCP_SHIFT; 1513 } else { 1514 optval = -1; 1515 } 1516 break; 1517 } 1518 error = sooptcopyout(sopt, &optval, sizeof optval); 1519 break; 1520 1521 /* 1522 * Multicast socket options are processed by the in_mcast 1523 * module. 1524 */ 1525 case IP_MULTICAST_IF: 1526 case IP_MULTICAST_VIF: 1527 case IP_MULTICAST_TTL: 1528 case IP_MULTICAST_LOOP: 1529 case IP_MSFILTER: 1530 error = inp_getmoptions(inp, sopt); 1531 break; 1532 1533 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1534 case IP_IPSEC_POLICY: 1535 if (IPSEC_ENABLED(ipv4)) { 1536 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1537 break; 1538 } 1539 /* FALLTHROUGH */ 1540 #endif /* IPSEC */ 1541 1542 default: 1543 error = ENOPROTOOPT; 1544 break; 1545 } 1546 break; 1547 } 1548 return (error); 1549 } 1550 1551 /* 1552 * Routine called from ip_output() to loop back a copy of an IP multicast 1553 * packet to the input queue of a specified interface. Note that this 1554 * calls the output routine of the loopback "driver", but with an interface 1555 * pointer that might NOT be a loopback interface -- evil, but easier than 1556 * replicating that code here. 1557 */ 1558 static void 1559 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen) 1560 { 1561 struct ip *ip; 1562 struct mbuf *copym; 1563 1564 /* 1565 * Make a deep copy of the packet because we're going to 1566 * modify the pack in order to generate checksums. 1567 */ 1568 copym = m_dup(m, M_NOWAIT); 1569 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen)) 1570 copym = m_pullup(copym, hlen); 1571 if (copym != NULL) { 1572 /* If needed, compute the checksum and mark it as valid. */ 1573 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1574 in_delayed_cksum(copym); 1575 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1576 copym->m_pkthdr.csum_flags |= 1577 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1578 copym->m_pkthdr.csum_data = 0xffff; 1579 } 1580 /* 1581 * We don't bother to fragment if the IP length is greater 1582 * than the interface's MTU. Can this possibly matter? 1583 */ 1584 ip = mtod(copym, struct ip *); 1585 ip->ip_sum = 0; 1586 ip->ip_sum = in_cksum(copym, hlen); 1587 if_simloop(ifp, copym, AF_INET, 0); 1588 } 1589 } 1590