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_mpath.h" 42 #include "opt_ratelimit.h" 43 #include "opt_route.h" 44 #include "opt_rss.h" 45 #include "opt_sctp.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/ktls.h> 51 #include <sys/lock.h> 52 #include <sys/malloc.h> 53 #include <sys/mbuf.h> 54 #include <sys/priv.h> 55 #include <sys/proc.h> 56 #include <sys/protosw.h> 57 #include <sys/rmlock.h> 58 #include <sys/sdt.h> 59 #include <sys/socket.h> 60 #include <sys/socketvar.h> 61 #include <sys/sysctl.h> 62 #include <sys/ucred.h> 63 64 #include <net/if.h> 65 #include <net/if_var.h> 66 #include <net/if_llatbl.h> 67 #include <net/netisr.h> 68 #include <net/pfil.h> 69 #include <net/route.h> 70 #ifdef RADIX_MPATH 71 #include <net/radix_mpath.h> 72 #endif 73 #include <net/rss_config.h> 74 #include <net/vnet.h> 75 76 #include <netinet/in.h> 77 #include <netinet/in_fib.h> 78 #include <netinet/in_kdtrace.h> 79 #include <netinet/in_systm.h> 80 #include <netinet/ip.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 #ifdef SCTP 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); 108 109 110 extern int in_mcast_loop; 111 extern struct protosw inetsw[]; 112 113 static inline int 114 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, int flags, 115 struct inpcb *inp, struct sockaddr_in *dst, int *fibnum, int *error) 116 { 117 struct m_tag *fwd_tag = NULL; 118 struct mbuf *m; 119 struct in_addr odst; 120 struct ip *ip; 121 int pflags = PFIL_OUT; 122 123 if (flags & IP_FORWARDING) 124 pflags |= PFIL_FWD; 125 126 m = *mp; 127 ip = mtod(m, struct ip *); 128 129 /* Run through list of hooks for output packets. */ 130 odst.s_addr = ip->ip_dst.s_addr; 131 switch (pfil_run_hooks(V_inet_pfil_head, mp, ifp, pflags, inp)) { 132 case PFIL_DROPPED: 133 *error = EACCES; 134 /* FALLTHROUGH */ 135 case PFIL_CONSUMED: 136 return 1; /* Finished */ 137 case PFIL_PASS: 138 *error = 0; 139 } 140 m = *mp; 141 ip = mtod(m, struct ip *); 142 143 /* See if destination IP address was changed by packet filter. */ 144 if (odst.s_addr != ip->ip_dst.s_addr) { 145 m->m_flags |= M_SKIP_FIREWALL; 146 /* If destination is now ourself drop to ip_input(). */ 147 if (in_localip(ip->ip_dst)) { 148 m->m_flags |= M_FASTFWD_OURS; 149 if (m->m_pkthdr.rcvif == NULL) 150 m->m_pkthdr.rcvif = V_loif; 151 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 152 m->m_pkthdr.csum_flags |= 153 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 154 m->m_pkthdr.csum_data = 0xffff; 155 } 156 m->m_pkthdr.csum_flags |= 157 CSUM_IP_CHECKED | CSUM_IP_VALID; 158 #ifdef SCTP 159 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 160 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 161 #endif 162 *error = netisr_queue(NETISR_IP, m); 163 return 1; /* Finished */ 164 } 165 166 bzero(dst, sizeof(*dst)); 167 dst->sin_family = AF_INET; 168 dst->sin_len = sizeof(*dst); 169 dst->sin_addr = ip->ip_dst; 170 171 return -1; /* Reloop */ 172 } 173 /* See if fib was changed by packet filter. */ 174 if ((*fibnum) != M_GETFIB(m)) { 175 m->m_flags |= M_SKIP_FIREWALL; 176 *fibnum = M_GETFIB(m); 177 return -1; /* Reloop for FIB change */ 178 } 179 180 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 181 if (m->m_flags & M_FASTFWD_OURS) { 182 if (m->m_pkthdr.rcvif == NULL) 183 m->m_pkthdr.rcvif = V_loif; 184 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 185 m->m_pkthdr.csum_flags |= 186 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 187 m->m_pkthdr.csum_data = 0xffff; 188 } 189 #ifdef SCTP 190 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 191 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 192 #endif 193 m->m_pkthdr.csum_flags |= 194 CSUM_IP_CHECKED | CSUM_IP_VALID; 195 196 *error = netisr_queue(NETISR_IP, m); 197 return 1; /* Finished */ 198 } 199 /* Or forward to some other address? */ 200 if ((m->m_flags & M_IP_NEXTHOP) && 201 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) { 202 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 203 m->m_flags |= M_SKIP_FIREWALL; 204 m->m_flags &= ~M_IP_NEXTHOP; 205 m_tag_delete(m, fwd_tag); 206 207 return -1; /* Reloop for CHANGE of dst */ 208 } 209 210 return 0; 211 } 212 213 static int 214 ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m, 215 const struct sockaddr_in *gw, struct route *ro, bool stamp_tag) 216 { 217 #ifdef KERN_TLS 218 struct ktls_session *tls = NULL; 219 #endif 220 struct m_snd_tag *mst; 221 int error; 222 223 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 224 mst = NULL; 225 226 #ifdef KERN_TLS 227 /* 228 * If this is an unencrypted TLS record, save a reference to 229 * the record. This local reference is used to call 230 * ktls_output_eagain after the mbuf has been freed (thus 231 * dropping the mbuf's reference) in if_output. 232 */ 233 if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) { 234 tls = ktls_hold(m->m_next->m_ext.ext_pgs->tls); 235 mst = tls->snd_tag; 236 237 /* 238 * If a TLS session doesn't have a valid tag, it must 239 * have had an earlier ifp mismatch, so drop this 240 * packet. 241 */ 242 if (mst == NULL) { 243 error = EAGAIN; 244 goto done; 245 } 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 error = EAGAIN; 264 goto done; 265 } 266 267 /* stamp send tag on mbuf */ 268 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst); 269 m->m_pkthdr.csum_flags |= CSUM_SND_TAG; 270 } 271 272 error = (*ifp->if_output)(ifp, m, (const struct sockaddr *)gw, ro); 273 274 done: 275 /* Check for route change invalidating send tags. */ 276 #ifdef KERN_TLS 277 if (tls != NULL) { 278 if (error == EAGAIN) 279 error = ktls_output_eagain(inp, tls); 280 ktls_free(tls); 281 } 282 #endif 283 #ifdef RATELIMIT 284 if (error == EAGAIN) 285 in_pcboutput_eagain(inp); 286 #endif 287 return (error); 288 } 289 290 /* 291 * IP output. The packet in mbuf chain m contains a skeletal IP 292 * header (with len, off, ttl, proto, tos, src, dst). 293 * The mbuf chain containing the packet will be freed. 294 * The mbuf opt, if present, will not be freed. 295 * If route ro is present and has ro_rt initialized, route lookup would be 296 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 297 * then result of route lookup is stored in ro->ro_rt. 298 * 299 * In the IP forwarding case, the packet will arrive with options already 300 * inserted, so must have a NULL opt pointer. 301 */ 302 int 303 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags, 304 struct ip_moptions *imo, struct inpcb *inp) 305 { 306 struct rm_priotracker in_ifa_tracker; 307 struct ip *ip; 308 struct ifnet *ifp = NULL; /* keep compiler happy */ 309 struct mbuf *m0; 310 int hlen = sizeof (struct ip); 311 int mtu; 312 int error = 0; 313 struct sockaddr_in *dst, sin; 314 const struct sockaddr_in *gw; 315 struct in_ifaddr *ia; 316 struct in_addr src; 317 int isbroadcast; 318 uint16_t ip_len, ip_off; 319 uint32_t fibnum; 320 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 321 int no_route_but_check_spd = 0; 322 #endif 323 324 M_ASSERTPKTHDR(m); 325 NET_EPOCH_ASSERT(); 326 327 if (inp != NULL) { 328 INP_LOCK_ASSERT(inp); 329 M_SETFIB(m, inp->inp_inc.inc_fibnum); 330 if ((flags & IP_NODEFAULTFLOWID) == 0) { 331 m->m_pkthdr.flowid = inp->inp_flowid; 332 M_HASHTYPE_SET(m, inp->inp_flowtype); 333 } 334 #ifdef NUMA 335 m->m_pkthdr.numa_domain = inp->inp_numa_domain; 336 #endif 337 } 338 339 if (opt) { 340 int len = 0; 341 m = ip_insertoptions(m, opt, &len); 342 if (len != 0) 343 hlen = len; /* ip->ip_hl is updated above */ 344 } 345 ip = mtod(m, struct ip *); 346 ip_len = ntohs(ip->ip_len); 347 ip_off = ntohs(ip->ip_off); 348 349 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 350 ip->ip_v = IPVERSION; 351 ip->ip_hl = hlen >> 2; 352 ip_fillid(ip); 353 } else { 354 /* Header already set, fetch hlen from there */ 355 hlen = ip->ip_hl << 2; 356 } 357 if ((flags & IP_FORWARDING) == 0) 358 IPSTAT_INC(ips_localout); 359 360 /* 361 * dst/gw handling: 362 * 363 * gw is readonly but can point either to dst OR rt_gateway, 364 * therefore we need restore gw if we're redoing lookup. 365 */ 366 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 367 if (ro != NULL) 368 dst = (struct sockaddr_in *)&ro->ro_dst; 369 else 370 dst = &sin; 371 if (ro == NULL || ro->ro_rt == NULL) { 372 bzero(dst, sizeof(*dst)); 373 dst->sin_family = AF_INET; 374 dst->sin_len = sizeof(*dst); 375 dst->sin_addr = ip->ip_dst; 376 } 377 gw = dst; 378 again: 379 /* 380 * Validate route against routing table additions; 381 * a better/more specific route might have been added. 382 */ 383 if (inp != NULL && ro != NULL && ro->ro_rt != NULL) 384 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum); 385 /* 386 * If there is a cached route, 387 * check that it is to the same destination 388 * and is still up. If not, free it and try again. 389 * The address family should also be checked in case of sharing the 390 * cache with IPv6. 391 * Also check whether routing cache needs invalidation. 392 */ 393 if (ro != NULL && ro->ro_rt != NULL && 394 ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 395 ro->ro_rt->rt_ifp == NULL || !RT_LINK_IS_UP(ro->ro_rt->rt_ifp) || 396 dst->sin_family != AF_INET || 397 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) 398 RO_INVALIDATE_CACHE(ro); 399 ia = NULL; 400 /* 401 * If routing to interface only, short circuit routing lookup. 402 * The use of an all-ones broadcast address implies this; an 403 * interface is specified by the broadcast address of an interface, 404 * or the destination address of a ptp interface. 405 */ 406 if (flags & IP_SENDONES) { 407 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst), 408 M_GETFIB(m)))) == NULL && 409 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 410 M_GETFIB(m)))) == NULL) { 411 IPSTAT_INC(ips_noroute); 412 error = ENETUNREACH; 413 goto bad; 414 } 415 ip->ip_dst.s_addr = INADDR_BROADCAST; 416 dst->sin_addr = ip->ip_dst; 417 ifp = ia->ia_ifp; 418 mtu = ifp->if_mtu; 419 ip->ip_ttl = 1; 420 isbroadcast = 1; 421 src = IA_SIN(ia)->sin_addr; 422 } else if (flags & IP_ROUTETOIF) { 423 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 424 M_GETFIB(m)))) == NULL && 425 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0, 426 M_GETFIB(m)))) == NULL) { 427 IPSTAT_INC(ips_noroute); 428 error = ENETUNREACH; 429 goto bad; 430 } 431 ifp = ia->ia_ifp; 432 mtu = ifp->if_mtu; 433 ip->ip_ttl = 1; 434 isbroadcast = ifp->if_flags & IFF_BROADCAST ? 435 in_ifaddr_broadcast(dst->sin_addr, ia) : 0; 436 src = IA_SIN(ia)->sin_addr; 437 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 438 imo != NULL && imo->imo_multicast_ifp != NULL) { 439 /* 440 * Bypass the normal routing lookup for multicast 441 * packets if the interface is specified. 442 */ 443 ifp = imo->imo_multicast_ifp; 444 mtu = ifp->if_mtu; 445 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 446 isbroadcast = 0; /* fool gcc */ 447 /* Interface may have no addresses. */ 448 if (ia != NULL) 449 src = IA_SIN(ia)->sin_addr; 450 else 451 src.s_addr = INADDR_ANY; 452 } else if (ro != NULL) { 453 if (ro->ro_rt == NULL) { 454 /* 455 * We want to do any cloning requested by the link 456 * layer, as this is probably required in all cases 457 * for correct operation (as it is for ARP). 458 */ 459 #ifdef RADIX_MPATH 460 rtalloc_mpath_fib(ro, 461 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), 462 fibnum); 463 #else 464 in_rtalloc_ign(ro, 0, fibnum); 465 #endif 466 if (ro->ro_rt == NULL || 467 (ro->ro_rt->rt_flags & RTF_UP) == 0 || 468 ro->ro_rt->rt_ifp == NULL || 469 !RT_LINK_IS_UP(ro->ro_rt->rt_ifp)) { 470 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 471 /* 472 * There is no route for this packet, but it is 473 * possible that a matching SPD entry exists. 474 */ 475 no_route_but_check_spd = 1; 476 mtu = 0; /* Silence GCC warning. */ 477 goto sendit; 478 #endif 479 IPSTAT_INC(ips_noroute); 480 error = EHOSTUNREACH; 481 goto bad; 482 } 483 } 484 ia = ifatoia(ro->ro_rt->rt_ifa); 485 ifp = ro->ro_rt->rt_ifp; 486 counter_u64_add(ro->ro_rt->rt_pksent, 1); 487 rt_update_ro_flags(ro); 488 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 489 gw = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 490 if (ro->ro_rt->rt_flags & RTF_HOST) 491 isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST); 492 else if (ifp->if_flags & IFF_BROADCAST) 493 isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia); 494 else 495 isbroadcast = 0; 496 if (ro->ro_rt->rt_flags & RTF_HOST) 497 mtu = ro->ro_rt->rt_mtu; 498 else 499 mtu = ifp->if_mtu; 500 src = IA_SIN(ia)->sin_addr; 501 } else { 502 struct nhop4_extended nh; 503 504 bzero(&nh, sizeof(nh)); 505 if (fib4_lookup_nh_ext(M_GETFIB(m), ip->ip_dst, 0, 0, &nh) != 506 0) { 507 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 508 /* 509 * There is no route for this packet, but it is 510 * possible that a matching SPD entry exists. 511 */ 512 no_route_but_check_spd = 1; 513 mtu = 0; /* Silence GCC warning. */ 514 goto sendit; 515 #endif 516 IPSTAT_INC(ips_noroute); 517 error = EHOSTUNREACH; 518 goto bad; 519 } 520 ifp = nh.nh_ifp; 521 mtu = nh.nh_mtu; 522 /* 523 * We are rewriting here dst to be gw actually, contradicting 524 * comment at the beginning of the function. However, in this 525 * case we are always dealing with on stack dst. 526 * In case if pfil(9) sends us back to beginning of the 527 * function, the dst would be rewritten by ip_output_pfil(). 528 */ 529 MPASS(dst == &sin); 530 dst->sin_addr = nh.nh_addr; 531 ia = nh.nh_ia; 532 src = nh.nh_src; 533 isbroadcast = (((nh.nh_flags & (NHF_HOST | NHF_BROADCAST)) == 534 (NHF_HOST | NHF_BROADCAST)) || 535 ((ifp->if_flags & IFF_BROADCAST) && 536 in_ifaddr_broadcast(dst->sin_addr, ia))); 537 } 538 539 /* Catch a possible divide by zero later. */ 540 KASSERT(mtu > 0, ("%s: mtu %d <= 0, ro=%p (rt_flags=0x%08x) ifp=%p", 541 __func__, mtu, ro, 542 (ro != NULL && ro->ro_rt != NULL) ? ro->ro_rt->rt_flags : 0, ifp)); 543 544 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 545 m->m_flags |= M_MCAST; 546 /* 547 * IP destination address is multicast. Make sure "gw" 548 * still points to the address in "ro". (It may have been 549 * changed to point to a gateway address, above.) 550 */ 551 gw = dst; 552 /* 553 * See if the caller provided any multicast options 554 */ 555 if (imo != NULL) { 556 ip->ip_ttl = imo->imo_multicast_ttl; 557 if (imo->imo_multicast_vif != -1) 558 ip->ip_src.s_addr = 559 ip_mcast_src ? 560 ip_mcast_src(imo->imo_multicast_vif) : 561 INADDR_ANY; 562 } else 563 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 564 /* 565 * Confirm that the outgoing interface supports multicast. 566 */ 567 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 568 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 569 IPSTAT_INC(ips_noroute); 570 error = ENETUNREACH; 571 goto bad; 572 } 573 } 574 /* 575 * If source address not specified yet, use address 576 * of outgoing interface. 577 */ 578 if (ip->ip_src.s_addr == INADDR_ANY) 579 ip->ip_src = src; 580 581 if ((imo == NULL && in_mcast_loop) || 582 (imo && imo->imo_multicast_loop)) { 583 /* 584 * Loop back multicast datagram if not expressly 585 * forbidden to do so, even if we are not a member 586 * of the group; ip_input() will filter it later, 587 * thus deferring a hash lookup and mutex acquisition 588 * at the expense of a cheap copy using m_copym(). 589 */ 590 ip_mloopback(ifp, m, hlen); 591 } else { 592 /* 593 * If we are acting as a multicast router, perform 594 * multicast forwarding as if the packet had just 595 * arrived on the interface to which we are about 596 * to send. The multicast forwarding function 597 * recursively calls this function, using the 598 * IP_FORWARDING flag to prevent infinite recursion. 599 * 600 * Multicasts that are looped back by ip_mloopback(), 601 * above, will be forwarded by the ip_input() routine, 602 * if necessary. 603 */ 604 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) { 605 /* 606 * If rsvp daemon is not running, do not 607 * set ip_moptions. This ensures that the packet 608 * is multicast and not just sent down one link 609 * as prescribed by rsvpd. 610 */ 611 if (!V_rsvp_on) 612 imo = NULL; 613 if (ip_mforward && 614 ip_mforward(ip, ifp, m, imo) != 0) { 615 m_freem(m); 616 goto done; 617 } 618 } 619 } 620 621 /* 622 * Multicasts with a time-to-live of zero may be looped- 623 * back, above, but must not be transmitted on a network. 624 * Also, multicasts addressed to the loopback interface 625 * are not sent -- the above call to ip_mloopback() will 626 * loop back a copy. ip_input() will drop the copy if 627 * this host does not belong to the destination group on 628 * the loopback interface. 629 */ 630 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 631 m_freem(m); 632 goto done; 633 } 634 635 goto sendit; 636 } 637 638 /* 639 * If the source address is not specified yet, use the address 640 * of the outoing interface. 641 */ 642 if (ip->ip_src.s_addr == INADDR_ANY) 643 ip->ip_src = src; 644 645 /* 646 * Look for broadcast address and 647 * verify user is allowed to send 648 * such a packet. 649 */ 650 if (isbroadcast) { 651 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 652 error = EADDRNOTAVAIL; 653 goto bad; 654 } 655 if ((flags & IP_ALLOWBROADCAST) == 0) { 656 error = EACCES; 657 goto bad; 658 } 659 /* don't allow broadcast messages to be fragmented */ 660 if (ip_len > mtu) { 661 error = EMSGSIZE; 662 goto bad; 663 } 664 m->m_flags |= M_BCAST; 665 } else { 666 m->m_flags &= ~M_BCAST; 667 } 668 669 sendit: 670 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 671 if (IPSEC_ENABLED(ipv4)) { 672 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) { 673 if (error == EINPROGRESS) 674 error = 0; 675 goto done; 676 } 677 } 678 /* 679 * Check if there was a route for this packet; return error if not. 680 */ 681 if (no_route_but_check_spd) { 682 IPSTAT_INC(ips_noroute); 683 error = EHOSTUNREACH; 684 goto bad; 685 } 686 /* Update variables that are affected by ipsec4_output(). */ 687 ip = mtod(m, struct ip *); 688 hlen = ip->ip_hl << 2; 689 #endif /* IPSEC */ 690 691 /* Jump over all PFIL processing if hooks are not active. */ 692 if (PFIL_HOOKED_OUT(V_inet_pfil_head)) { 693 switch (ip_output_pfil(&m, ifp, flags, inp, dst, &fibnum, 694 &error)) { 695 case 1: /* Finished */ 696 goto done; 697 698 case 0: /* Continue normally */ 699 ip = mtod(m, struct ip *); 700 break; 701 702 case -1: /* Need to try again */ 703 /* Reset everything for a new round */ 704 if (ro != NULL) { 705 RO_RTFREE(ro); 706 ro->ro_prepend = NULL; 707 } 708 gw = dst; 709 ip = mtod(m, struct ip *); 710 goto again; 711 712 } 713 } 714 715 /* IN_LOOPBACK must not appear on the wire - RFC1122. */ 716 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 717 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 718 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 719 IPSTAT_INC(ips_badaddr); 720 error = EADDRNOTAVAIL; 721 goto bad; 722 } 723 } 724 725 m->m_pkthdr.csum_flags |= CSUM_IP; 726 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 727 m = mb_unmapped_to_ext(m); 728 if (m == NULL) { 729 IPSTAT_INC(ips_odropped); 730 error = ENOBUFS; 731 goto bad; 732 } 733 in_delayed_cksum(m); 734 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 735 } else if ((ifp->if_capenable & IFCAP_NOMAP) == 0) { 736 m = mb_unmapped_to_ext(m); 737 if (m == NULL) { 738 IPSTAT_INC(ips_odropped); 739 error = ENOBUFS; 740 goto bad; 741 } 742 } 743 #ifdef SCTP 744 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 745 m = mb_unmapped_to_ext(m); 746 if (m == NULL) { 747 IPSTAT_INC(ips_odropped); 748 error = ENOBUFS; 749 goto bad; 750 } 751 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 752 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 753 } 754 #endif 755 756 /* 757 * If small enough for interface, or the interface will take 758 * care of the fragmentation for us, we can just send directly. 759 */ 760 if (ip_len <= mtu || 761 (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 762 ip->ip_sum = 0; 763 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 764 ip->ip_sum = in_cksum(m, hlen); 765 m->m_pkthdr.csum_flags &= ~CSUM_IP; 766 } 767 768 /* 769 * Record statistics for this interface address. 770 * With CSUM_TSO the byte/packet count will be slightly 771 * incorrect because we count the IP+TCP headers only 772 * once instead of for every generated packet. 773 */ 774 if (!(flags & IP_FORWARDING) && ia) { 775 if (m->m_pkthdr.csum_flags & CSUM_TSO) 776 counter_u64_add(ia->ia_ifa.ifa_opackets, 777 m->m_pkthdr.len / m->m_pkthdr.tso_segsz); 778 else 779 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 780 781 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len); 782 } 783 #ifdef MBUF_STRESS_TEST 784 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 785 m = m_fragment(m, M_NOWAIT, mbuf_frag_size); 786 #endif 787 /* 788 * Reset layer specific mbuf flags 789 * to avoid confusing lower layers. 790 */ 791 m_clrprotoflags(m); 792 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 793 error = ip_output_send(inp, ifp, m, gw, ro, 794 (flags & IP_NO_SND_TAG_RL) ? false : true); 795 goto done; 796 } 797 798 /* Balk when DF bit is set or the interface didn't support TSO. */ 799 if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) { 800 error = EMSGSIZE; 801 IPSTAT_INC(ips_cantfrag); 802 goto bad; 803 } 804 805 /* 806 * Too large for interface; fragment if possible. If successful, 807 * on return, m will point to a list of packets to be sent. 808 */ 809 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist); 810 if (error) 811 goto bad; 812 for (; m; m = m0) { 813 m0 = m->m_nextpkt; 814 m->m_nextpkt = 0; 815 if (error == 0) { 816 /* Record statistics for this interface address. */ 817 if (ia != NULL) { 818 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 819 counter_u64_add(ia->ia_ifa.ifa_obytes, 820 m->m_pkthdr.len); 821 } 822 /* 823 * Reset layer specific mbuf flags 824 * to avoid confusing upper layers. 825 */ 826 m_clrprotoflags(m); 827 828 IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp, 829 mtod(m, struct ip *), NULL); 830 error = ip_output_send(inp, ifp, m, gw, ro, true); 831 } else 832 m_freem(m); 833 } 834 835 if (error == 0) 836 IPSTAT_INC(ips_fragmented); 837 838 done: 839 return (error); 840 bad: 841 m_freem(m); 842 goto done; 843 } 844 845 /* 846 * Create a chain of fragments which fit the given mtu. m_frag points to the 847 * mbuf to be fragmented; on return it points to the chain with the fragments. 848 * Return 0 if no error. If error, m_frag may contain a partially built 849 * chain of fragments that should be freed by the caller. 850 * 851 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist) 852 */ 853 int 854 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 855 u_long if_hwassist_flags) 856 { 857 int error = 0; 858 int hlen = ip->ip_hl << 2; 859 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */ 860 int off; 861 struct mbuf *m0 = *m_frag; /* the original packet */ 862 int firstlen; 863 struct mbuf **mnext; 864 int nfrags; 865 uint16_t ip_len, ip_off; 866 867 ip_len = ntohs(ip->ip_len); 868 ip_off = ntohs(ip->ip_off); 869 870 if (ip_off & IP_DF) { /* Fragmentation not allowed */ 871 IPSTAT_INC(ips_cantfrag); 872 return EMSGSIZE; 873 } 874 875 /* 876 * Must be able to put at least 8 bytes per fragment. 877 */ 878 if (len < 8) 879 return EMSGSIZE; 880 881 /* 882 * If the interface will not calculate checksums on 883 * fragmented packets, then do it here. 884 */ 885 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 886 m0 = mb_unmapped_to_ext(m0); 887 if (m0 == NULL) { 888 error = ENOBUFS; 889 IPSTAT_INC(ips_odropped); 890 goto done; 891 } 892 in_delayed_cksum(m0); 893 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 894 } 895 #ifdef SCTP 896 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) { 897 m0 = mb_unmapped_to_ext(m0); 898 if (m0 == NULL) { 899 error = ENOBUFS; 900 IPSTAT_INC(ips_odropped); 901 goto done; 902 } 903 sctp_delayed_cksum(m0, hlen); 904 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 905 } 906 #endif 907 if (len > PAGE_SIZE) { 908 /* 909 * Fragment large datagrams such that each segment 910 * contains a multiple of PAGE_SIZE amount of data, 911 * plus headers. This enables a receiver to perform 912 * page-flipping zero-copy optimizations. 913 * 914 * XXX When does this help given that sender and receiver 915 * could have different page sizes, and also mtu could 916 * be less than the receiver's page size ? 917 */ 918 int newlen; 919 920 off = MIN(mtu, m0->m_pkthdr.len); 921 922 /* 923 * firstlen (off - hlen) must be aligned on an 924 * 8-byte boundary 925 */ 926 if (off < hlen) 927 goto smart_frag_failure; 928 off = ((off - hlen) & ~7) + hlen; 929 newlen = (~PAGE_MASK) & mtu; 930 if ((newlen + sizeof (struct ip)) > mtu) { 931 /* we failed, go back the default */ 932 smart_frag_failure: 933 newlen = len; 934 off = hlen + len; 935 } 936 len = newlen; 937 938 } else { 939 off = hlen + len; 940 } 941 942 firstlen = off - hlen; 943 mnext = &m0->m_nextpkt; /* pointer to next packet */ 944 945 /* 946 * Loop through length of segment after first fragment, 947 * make new header and copy data of each part and link onto chain. 948 * Here, m0 is the original packet, m is the fragment being created. 949 * The fragments are linked off the m_nextpkt of the original 950 * packet, which after processing serves as the first fragment. 951 */ 952 for (nfrags = 1; off < ip_len; off += len, nfrags++) { 953 struct ip *mhip; /* ip header on the fragment */ 954 struct mbuf *m; 955 int mhlen = sizeof (struct ip); 956 957 m = m_gethdr(M_NOWAIT, MT_DATA); 958 if (m == NULL) { 959 error = ENOBUFS; 960 IPSTAT_INC(ips_odropped); 961 goto done; 962 } 963 /* 964 * Make sure the complete packet header gets copied 965 * from the originating mbuf to the newly created 966 * mbuf. This also ensures that existing firewall 967 * classification(s), VLAN tags and so on get copied 968 * to the resulting fragmented packet(s): 969 */ 970 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) { 971 m_free(m); 972 error = ENOBUFS; 973 IPSTAT_INC(ips_odropped); 974 goto done; 975 } 976 /* 977 * In the first mbuf, leave room for the link header, then 978 * copy the original IP header including options. The payload 979 * goes into an additional mbuf chain returned by m_copym(). 980 */ 981 m->m_data += max_linkhdr; 982 mhip = mtod(m, struct ip *); 983 *mhip = *ip; 984 if (hlen > sizeof (struct ip)) { 985 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 986 mhip->ip_v = IPVERSION; 987 mhip->ip_hl = mhlen >> 2; 988 } 989 m->m_len = mhlen; 990 /* XXX do we need to add ip_off below ? */ 991 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 992 if (off + len >= ip_len) 993 len = ip_len - off; 994 else 995 mhip->ip_off |= IP_MF; 996 mhip->ip_len = htons((u_short)(len + mhlen)); 997 m->m_next = m_copym(m0, off, len, M_NOWAIT); 998 if (m->m_next == NULL) { /* copy failed */ 999 m_free(m); 1000 error = ENOBUFS; /* ??? */ 1001 IPSTAT_INC(ips_odropped); 1002 goto done; 1003 } 1004 m->m_pkthdr.len = mhlen + len; 1005 #ifdef MAC 1006 mac_netinet_fragment(m0, m); 1007 #endif 1008 mhip->ip_off = htons(mhip->ip_off); 1009 mhip->ip_sum = 0; 1010 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 1011 mhip->ip_sum = in_cksum(m, mhlen); 1012 m->m_pkthdr.csum_flags &= ~CSUM_IP; 1013 } 1014 *mnext = m; 1015 mnext = &m->m_nextpkt; 1016 } 1017 IPSTAT_ADD(ips_ofragments, nfrags); 1018 1019 /* 1020 * Update first fragment by trimming what's been copied out 1021 * and updating header. 1022 */ 1023 m_adj(m0, hlen + firstlen - ip_len); 1024 m0->m_pkthdr.len = hlen + firstlen; 1025 ip->ip_len = htons((u_short)m0->m_pkthdr.len); 1026 ip->ip_off = htons(ip_off | IP_MF); 1027 ip->ip_sum = 0; 1028 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 1029 ip->ip_sum = in_cksum(m0, hlen); 1030 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 1031 } 1032 1033 done: 1034 *m_frag = m0; 1035 return error; 1036 } 1037 1038 void 1039 in_delayed_cksum(struct mbuf *m) 1040 { 1041 struct ip *ip; 1042 struct udphdr *uh; 1043 uint16_t cklen, csum, offset; 1044 1045 ip = mtod(m, struct ip *); 1046 offset = ip->ip_hl << 2 ; 1047 1048 if (m->m_pkthdr.csum_flags & CSUM_UDP) { 1049 /* if udp header is not in the first mbuf copy udplen */ 1050 if (offset + sizeof(struct udphdr) > m->m_len) { 1051 m_copydata(m, offset + offsetof(struct udphdr, 1052 uh_ulen), sizeof(cklen), (caddr_t)&cklen); 1053 cklen = ntohs(cklen); 1054 } else { 1055 uh = (struct udphdr *)mtodo(m, offset); 1056 cklen = ntohs(uh->uh_ulen); 1057 } 1058 csum = in_cksum_skip(m, cklen + offset, offset); 1059 if (csum == 0) 1060 csum = 0xffff; 1061 } else { 1062 cklen = ntohs(ip->ip_len); 1063 csum = in_cksum_skip(m, cklen, offset); 1064 } 1065 offset += m->m_pkthdr.csum_data; /* checksum offset */ 1066 1067 if (offset + sizeof(csum) > m->m_len) 1068 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum); 1069 else 1070 *(u_short *)mtodo(m, offset) = csum; 1071 } 1072 1073 /* 1074 * IP socket option processing. 1075 */ 1076 int 1077 ip_ctloutput(struct socket *so, struct sockopt *sopt) 1078 { 1079 struct inpcb *inp = sotoinpcb(so); 1080 int error, optval; 1081 #ifdef RSS 1082 uint32_t rss_bucket; 1083 int retval; 1084 #endif 1085 1086 error = optval = 0; 1087 if (sopt->sopt_level != IPPROTO_IP) { 1088 error = EINVAL; 1089 1090 if (sopt->sopt_level == SOL_SOCKET && 1091 sopt->sopt_dir == SOPT_SET) { 1092 switch (sopt->sopt_name) { 1093 case SO_REUSEADDR: 1094 INP_WLOCK(inp); 1095 if ((so->so_options & SO_REUSEADDR) != 0) 1096 inp->inp_flags2 |= INP_REUSEADDR; 1097 else 1098 inp->inp_flags2 &= ~INP_REUSEADDR; 1099 INP_WUNLOCK(inp); 1100 error = 0; 1101 break; 1102 case SO_REUSEPORT: 1103 INP_WLOCK(inp); 1104 if ((so->so_options & SO_REUSEPORT) != 0) 1105 inp->inp_flags2 |= INP_REUSEPORT; 1106 else 1107 inp->inp_flags2 &= ~INP_REUSEPORT; 1108 INP_WUNLOCK(inp); 1109 error = 0; 1110 break; 1111 case SO_REUSEPORT_LB: 1112 INP_WLOCK(inp); 1113 if ((so->so_options & SO_REUSEPORT_LB) != 0) 1114 inp->inp_flags2 |= INP_REUSEPORT_LB; 1115 else 1116 inp->inp_flags2 &= ~INP_REUSEPORT_LB; 1117 INP_WUNLOCK(inp); 1118 error = 0; 1119 break; 1120 case SO_SETFIB: 1121 INP_WLOCK(inp); 1122 inp->inp_inc.inc_fibnum = so->so_fibnum; 1123 INP_WUNLOCK(inp); 1124 error = 0; 1125 break; 1126 case SO_MAX_PACING_RATE: 1127 #ifdef RATELIMIT 1128 INP_WLOCK(inp); 1129 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 1130 INP_WUNLOCK(inp); 1131 error = 0; 1132 #else 1133 error = EOPNOTSUPP; 1134 #endif 1135 break; 1136 default: 1137 break; 1138 } 1139 } 1140 return (error); 1141 } 1142 1143 switch (sopt->sopt_dir) { 1144 case SOPT_SET: 1145 switch (sopt->sopt_name) { 1146 case IP_OPTIONS: 1147 #ifdef notyet 1148 case IP_RETOPTS: 1149 #endif 1150 { 1151 struct mbuf *m; 1152 if (sopt->sopt_valsize > MLEN) { 1153 error = EMSGSIZE; 1154 break; 1155 } 1156 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA); 1157 if (m == NULL) { 1158 error = ENOBUFS; 1159 break; 1160 } 1161 m->m_len = sopt->sopt_valsize; 1162 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 1163 m->m_len); 1164 if (error) { 1165 m_free(m); 1166 break; 1167 } 1168 INP_WLOCK(inp); 1169 error = ip_pcbopts(inp, sopt->sopt_name, m); 1170 INP_WUNLOCK(inp); 1171 return (error); 1172 } 1173 1174 case IP_BINDANY: 1175 if (sopt->sopt_td != NULL) { 1176 error = priv_check(sopt->sopt_td, 1177 PRIV_NETINET_BINDANY); 1178 if (error) 1179 break; 1180 } 1181 /* FALLTHROUGH */ 1182 case IP_BINDMULTI: 1183 #ifdef RSS 1184 case IP_RSS_LISTEN_BUCKET: 1185 #endif 1186 case IP_TOS: 1187 case IP_TTL: 1188 case IP_MINTTL: 1189 case IP_RECVOPTS: 1190 case IP_RECVRETOPTS: 1191 case IP_ORIGDSTADDR: 1192 case IP_RECVDSTADDR: 1193 case IP_RECVTTL: 1194 case IP_RECVIF: 1195 case IP_ONESBCAST: 1196 case IP_DONTFRAG: 1197 case IP_RECVTOS: 1198 case IP_RECVFLOWID: 1199 #ifdef RSS 1200 case IP_RECVRSSBUCKETID: 1201 #endif 1202 error = sooptcopyin(sopt, &optval, sizeof optval, 1203 sizeof optval); 1204 if (error) 1205 break; 1206 1207 switch (sopt->sopt_name) { 1208 case IP_TOS: 1209 inp->inp_ip_tos = optval; 1210 break; 1211 1212 case IP_TTL: 1213 inp->inp_ip_ttl = optval; 1214 break; 1215 1216 case IP_MINTTL: 1217 if (optval >= 0 && optval <= MAXTTL) 1218 inp->inp_ip_minttl = optval; 1219 else 1220 error = EINVAL; 1221 break; 1222 1223 #define OPTSET(bit) do { \ 1224 INP_WLOCK(inp); \ 1225 if (optval) \ 1226 inp->inp_flags |= bit; \ 1227 else \ 1228 inp->inp_flags &= ~bit; \ 1229 INP_WUNLOCK(inp); \ 1230 } while (0) 1231 1232 #define OPTSET2(bit, val) do { \ 1233 INP_WLOCK(inp); \ 1234 if (val) \ 1235 inp->inp_flags2 |= bit; \ 1236 else \ 1237 inp->inp_flags2 &= ~bit; \ 1238 INP_WUNLOCK(inp); \ 1239 } while (0) 1240 1241 case IP_RECVOPTS: 1242 OPTSET(INP_RECVOPTS); 1243 break; 1244 1245 case IP_RECVRETOPTS: 1246 OPTSET(INP_RECVRETOPTS); 1247 break; 1248 1249 case IP_RECVDSTADDR: 1250 OPTSET(INP_RECVDSTADDR); 1251 break; 1252 1253 case IP_ORIGDSTADDR: 1254 OPTSET2(INP_ORIGDSTADDR, optval); 1255 break; 1256 1257 case IP_RECVTTL: 1258 OPTSET(INP_RECVTTL); 1259 break; 1260 1261 case IP_RECVIF: 1262 OPTSET(INP_RECVIF); 1263 break; 1264 1265 case IP_ONESBCAST: 1266 OPTSET(INP_ONESBCAST); 1267 break; 1268 case IP_DONTFRAG: 1269 OPTSET(INP_DONTFRAG); 1270 break; 1271 case IP_BINDANY: 1272 OPTSET(INP_BINDANY); 1273 break; 1274 case IP_RECVTOS: 1275 OPTSET(INP_RECVTOS); 1276 break; 1277 case IP_BINDMULTI: 1278 OPTSET2(INP_BINDMULTI, optval); 1279 break; 1280 case IP_RECVFLOWID: 1281 OPTSET2(INP_RECVFLOWID, optval); 1282 break; 1283 #ifdef RSS 1284 case IP_RSS_LISTEN_BUCKET: 1285 if ((optval >= 0) && 1286 (optval < rss_getnumbuckets())) { 1287 inp->inp_rss_listen_bucket = optval; 1288 OPTSET2(INP_RSS_BUCKET_SET, 1); 1289 } else { 1290 error = EINVAL; 1291 } 1292 break; 1293 case IP_RECVRSSBUCKETID: 1294 OPTSET2(INP_RECVRSSBUCKETID, optval); 1295 break; 1296 #endif 1297 } 1298 break; 1299 #undef OPTSET 1300 #undef OPTSET2 1301 1302 /* 1303 * Multicast socket options are processed by the in_mcast 1304 * module. 1305 */ 1306 case IP_MULTICAST_IF: 1307 case IP_MULTICAST_VIF: 1308 case IP_MULTICAST_TTL: 1309 case IP_MULTICAST_LOOP: 1310 case IP_ADD_MEMBERSHIP: 1311 case IP_DROP_MEMBERSHIP: 1312 case IP_ADD_SOURCE_MEMBERSHIP: 1313 case IP_DROP_SOURCE_MEMBERSHIP: 1314 case IP_BLOCK_SOURCE: 1315 case IP_UNBLOCK_SOURCE: 1316 case IP_MSFILTER: 1317 case MCAST_JOIN_GROUP: 1318 case MCAST_LEAVE_GROUP: 1319 case MCAST_JOIN_SOURCE_GROUP: 1320 case MCAST_LEAVE_SOURCE_GROUP: 1321 case MCAST_BLOCK_SOURCE: 1322 case MCAST_UNBLOCK_SOURCE: 1323 error = inp_setmoptions(inp, sopt); 1324 break; 1325 1326 case IP_PORTRANGE: 1327 error = sooptcopyin(sopt, &optval, sizeof optval, 1328 sizeof optval); 1329 if (error) 1330 break; 1331 1332 INP_WLOCK(inp); 1333 switch (optval) { 1334 case IP_PORTRANGE_DEFAULT: 1335 inp->inp_flags &= ~(INP_LOWPORT); 1336 inp->inp_flags &= ~(INP_HIGHPORT); 1337 break; 1338 1339 case IP_PORTRANGE_HIGH: 1340 inp->inp_flags &= ~(INP_LOWPORT); 1341 inp->inp_flags |= INP_HIGHPORT; 1342 break; 1343 1344 case IP_PORTRANGE_LOW: 1345 inp->inp_flags &= ~(INP_HIGHPORT); 1346 inp->inp_flags |= INP_LOWPORT; 1347 break; 1348 1349 default: 1350 error = EINVAL; 1351 break; 1352 } 1353 INP_WUNLOCK(inp); 1354 break; 1355 1356 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1357 case IP_IPSEC_POLICY: 1358 if (IPSEC_ENABLED(ipv4)) { 1359 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1360 break; 1361 } 1362 /* FALLTHROUGH */ 1363 #endif /* IPSEC */ 1364 1365 default: 1366 error = ENOPROTOOPT; 1367 break; 1368 } 1369 break; 1370 1371 case SOPT_GET: 1372 switch (sopt->sopt_name) { 1373 case IP_OPTIONS: 1374 case IP_RETOPTS: 1375 INP_RLOCK(inp); 1376 if (inp->inp_options) { 1377 struct mbuf *options; 1378 1379 options = m_copym(inp->inp_options, 0, 1380 M_COPYALL, M_NOWAIT); 1381 INP_RUNLOCK(inp); 1382 if (options != NULL) { 1383 error = sooptcopyout(sopt, 1384 mtod(options, char *), 1385 options->m_len); 1386 m_freem(options); 1387 } else 1388 error = ENOMEM; 1389 } else { 1390 INP_RUNLOCK(inp); 1391 sopt->sopt_valsize = 0; 1392 } 1393 break; 1394 1395 case IP_TOS: 1396 case IP_TTL: 1397 case IP_MINTTL: 1398 case IP_RECVOPTS: 1399 case IP_RECVRETOPTS: 1400 case IP_ORIGDSTADDR: 1401 case IP_RECVDSTADDR: 1402 case IP_RECVTTL: 1403 case IP_RECVIF: 1404 case IP_PORTRANGE: 1405 case IP_ONESBCAST: 1406 case IP_DONTFRAG: 1407 case IP_BINDANY: 1408 case IP_RECVTOS: 1409 case IP_BINDMULTI: 1410 case IP_FLOWID: 1411 case IP_FLOWTYPE: 1412 case IP_RECVFLOWID: 1413 #ifdef RSS 1414 case IP_RSSBUCKETID: 1415 case IP_RECVRSSBUCKETID: 1416 #endif 1417 switch (sopt->sopt_name) { 1418 1419 case IP_TOS: 1420 optval = inp->inp_ip_tos; 1421 break; 1422 1423 case IP_TTL: 1424 optval = inp->inp_ip_ttl; 1425 break; 1426 1427 case IP_MINTTL: 1428 optval = inp->inp_ip_minttl; 1429 break; 1430 1431 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1432 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0) 1433 1434 case IP_RECVOPTS: 1435 optval = OPTBIT(INP_RECVOPTS); 1436 break; 1437 1438 case IP_RECVRETOPTS: 1439 optval = OPTBIT(INP_RECVRETOPTS); 1440 break; 1441 1442 case IP_RECVDSTADDR: 1443 optval = OPTBIT(INP_RECVDSTADDR); 1444 break; 1445 1446 case IP_ORIGDSTADDR: 1447 optval = OPTBIT2(INP_ORIGDSTADDR); 1448 break; 1449 1450 case IP_RECVTTL: 1451 optval = OPTBIT(INP_RECVTTL); 1452 break; 1453 1454 case IP_RECVIF: 1455 optval = OPTBIT(INP_RECVIF); 1456 break; 1457 1458 case IP_PORTRANGE: 1459 if (inp->inp_flags & INP_HIGHPORT) 1460 optval = IP_PORTRANGE_HIGH; 1461 else if (inp->inp_flags & INP_LOWPORT) 1462 optval = IP_PORTRANGE_LOW; 1463 else 1464 optval = 0; 1465 break; 1466 1467 case IP_ONESBCAST: 1468 optval = OPTBIT(INP_ONESBCAST); 1469 break; 1470 case IP_DONTFRAG: 1471 optval = OPTBIT(INP_DONTFRAG); 1472 break; 1473 case IP_BINDANY: 1474 optval = OPTBIT(INP_BINDANY); 1475 break; 1476 case IP_RECVTOS: 1477 optval = OPTBIT(INP_RECVTOS); 1478 break; 1479 case IP_FLOWID: 1480 optval = inp->inp_flowid; 1481 break; 1482 case IP_FLOWTYPE: 1483 optval = inp->inp_flowtype; 1484 break; 1485 case IP_RECVFLOWID: 1486 optval = OPTBIT2(INP_RECVFLOWID); 1487 break; 1488 #ifdef RSS 1489 case IP_RSSBUCKETID: 1490 retval = rss_hash2bucket(inp->inp_flowid, 1491 inp->inp_flowtype, 1492 &rss_bucket); 1493 if (retval == 0) 1494 optval = rss_bucket; 1495 else 1496 error = EINVAL; 1497 break; 1498 case IP_RECVRSSBUCKETID: 1499 optval = OPTBIT2(INP_RECVRSSBUCKETID); 1500 break; 1501 #endif 1502 case IP_BINDMULTI: 1503 optval = OPTBIT2(INP_BINDMULTI); 1504 break; 1505 } 1506 error = sooptcopyout(sopt, &optval, sizeof optval); 1507 break; 1508 1509 /* 1510 * Multicast socket options are processed by the in_mcast 1511 * module. 1512 */ 1513 case IP_MULTICAST_IF: 1514 case IP_MULTICAST_VIF: 1515 case IP_MULTICAST_TTL: 1516 case IP_MULTICAST_LOOP: 1517 case IP_MSFILTER: 1518 error = inp_getmoptions(inp, sopt); 1519 break; 1520 1521 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1522 case IP_IPSEC_POLICY: 1523 if (IPSEC_ENABLED(ipv4)) { 1524 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1525 break; 1526 } 1527 /* FALLTHROUGH */ 1528 #endif /* IPSEC */ 1529 1530 default: 1531 error = ENOPROTOOPT; 1532 break; 1533 } 1534 break; 1535 } 1536 return (error); 1537 } 1538 1539 /* 1540 * Routine called from ip_output() to loop back a copy of an IP multicast 1541 * packet to the input queue of a specified interface. Note that this 1542 * calls the output routine of the loopback "driver", but with an interface 1543 * pointer that might NOT be a loopback interface -- evil, but easier than 1544 * replicating that code here. 1545 */ 1546 static void 1547 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen) 1548 { 1549 struct ip *ip; 1550 struct mbuf *copym; 1551 1552 /* 1553 * Make a deep copy of the packet because we're going to 1554 * modify the pack in order to generate checksums. 1555 */ 1556 copym = m_dup(m, M_NOWAIT); 1557 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen)) 1558 copym = m_pullup(copym, hlen); 1559 if (copym != NULL) { 1560 /* If needed, compute the checksum and mark it as valid. */ 1561 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1562 in_delayed_cksum(copym); 1563 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1564 copym->m_pkthdr.csum_flags |= 1565 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1566 copym->m_pkthdr.csum_data = 0xffff; 1567 } 1568 /* 1569 * We don't bother to fragment if the IP length is greater 1570 * than the interface's MTU. Can this possibly matter? 1571 */ 1572 ip = mtod(copym, struct ip *); 1573 ip->ip_sum = 0; 1574 ip->ip_sum = in_cksum(copym, hlen); 1575 if_simloop(ifp, copym, AF_INET, 0); 1576 } 1577 } 1578