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_mbuf_stress_test.h" 40 #include "opt_mpath.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/lock.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/priv.h> 53 #include <sys/proc.h> 54 #include <sys/protosw.h> 55 #include <sys/rmlock.h> 56 #include <sys/sdt.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/sysctl.h> 60 #include <sys/ucred.h> 61 62 #include <net/if.h> 63 #include <net/if_var.h> 64 #include <net/if_llatbl.h> 65 #include <net/netisr.h> 66 #include <net/pfil.h> 67 #include <net/route.h> 68 #ifdef RADIX_MPATH 69 #include <net/radix_mpath.h> 70 #endif 71 #include <net/rss_config.h> 72 #include <net/vnet.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_fib.h> 76 #include <netinet/in_kdtrace.h> 77 #include <netinet/in_systm.h> 78 #include <netinet/ip.h> 79 #include <netinet/in_pcb.h> 80 #include <netinet/in_rss.h> 81 #include <netinet/in_var.h> 82 #include <netinet/ip_var.h> 83 #include <netinet/ip_options.h> 84 85 #include <netinet/udp.h> 86 #include <netinet/udp_var.h> 87 88 #ifdef SCTP 89 #include <netinet/sctp.h> 90 #include <netinet/sctp_crc32.h> 91 #endif 92 93 #include <netipsec/ipsec_support.h> 94 95 #include <machine/in_cksum.h> 96 97 #include <security/mac/mac_framework.h> 98 99 #ifdef MBUF_STRESS_TEST 100 static int mbuf_frag_size = 0; 101 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW, 102 &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size"); 103 #endif 104 105 static void ip_mloopback(struct ifnet *, const struct mbuf *, int); 106 107 108 extern int in_mcast_loop; 109 extern struct protosw inetsw[]; 110 111 static inline int 112 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, int flags, 113 struct inpcb *inp, struct sockaddr_in *dst, int *fibnum, int *error) 114 { 115 struct m_tag *fwd_tag = NULL; 116 struct mbuf *m; 117 struct in_addr odst; 118 struct ip *ip; 119 int pflags = PFIL_OUT; 120 121 if (flags & IP_FORWARDING) 122 pflags |= PFIL_FWD; 123 124 m = *mp; 125 ip = mtod(m, struct ip *); 126 127 /* Run through list of hooks for output packets. */ 128 odst.s_addr = ip->ip_dst.s_addr; 129 switch (pfil_run_hooks(V_inet_pfil_head, mp, ifp, pflags, inp)) { 130 case PFIL_DROPPED: 131 *error = EPERM; 132 /* FALLTHROUGH */ 133 case PFIL_CONSUMED: 134 return 1; /* Finished */ 135 case PFIL_PASS: 136 *error = 0; 137 } 138 m = *mp; 139 ip = mtod(m, struct ip *); 140 141 /* See if destination IP address was changed by packet filter. */ 142 if (odst.s_addr != ip->ip_dst.s_addr) { 143 m->m_flags |= M_SKIP_FIREWALL; 144 /* If destination is now ourself drop to ip_input(). */ 145 if (in_localip(ip->ip_dst)) { 146 m->m_flags |= M_FASTFWD_OURS; 147 if (m->m_pkthdr.rcvif == NULL) 148 m->m_pkthdr.rcvif = V_loif; 149 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 150 m->m_pkthdr.csum_flags |= 151 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 152 m->m_pkthdr.csum_data = 0xffff; 153 } 154 m->m_pkthdr.csum_flags |= 155 CSUM_IP_CHECKED | CSUM_IP_VALID; 156 #ifdef SCTP 157 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 158 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 159 #endif 160 *error = netisr_queue(NETISR_IP, m); 161 return 1; /* Finished */ 162 } 163 164 bzero(dst, sizeof(*dst)); 165 dst->sin_family = AF_INET; 166 dst->sin_len = sizeof(*dst); 167 dst->sin_addr = ip->ip_dst; 168 169 return -1; /* Reloop */ 170 } 171 /* See if fib was changed by packet filter. */ 172 if ((*fibnum) != M_GETFIB(m)) { 173 m->m_flags |= M_SKIP_FIREWALL; 174 *fibnum = M_GETFIB(m); 175 return -1; /* Reloop for FIB change */ 176 } 177 178 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 179 if (m->m_flags & M_FASTFWD_OURS) { 180 if (m->m_pkthdr.rcvif == NULL) 181 m->m_pkthdr.rcvif = V_loif; 182 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 183 m->m_pkthdr.csum_flags |= 184 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 185 m->m_pkthdr.csum_data = 0xffff; 186 } 187 #ifdef SCTP 188 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 189 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 190 #endif 191 m->m_pkthdr.csum_flags |= 192 CSUM_IP_CHECKED | CSUM_IP_VALID; 193 194 *error = netisr_queue(NETISR_IP, m); 195 return 1; /* Finished */ 196 } 197 /* Or forward to some other address? */ 198 if ((m->m_flags & M_IP_NEXTHOP) && 199 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) { 200 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 201 m->m_flags |= M_SKIP_FIREWALL; 202 m->m_flags &= ~M_IP_NEXTHOP; 203 m_tag_delete(m, fwd_tag); 204 205 return -1; /* Reloop for CHANGE of dst */ 206 } 207 208 return 0; 209 } 210 211 static int 212 ip_output_send(struct inpcb *inp, struct ifnet *ifp, struct mbuf *m, 213 const struct sockaddr_in *gw, struct route *ro) 214 { 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 RATELIMIT 222 if (inp != NULL) { 223 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 || 224 (inp->inp_snd_tag != NULL && 225 inp->inp_snd_tag->ifp != ifp)) 226 in_pcboutput_txrtlmt(inp, ifp, m); 227 228 if (inp->inp_snd_tag != NULL) 229 mst = inp->inp_snd_tag; 230 } 231 #endif 232 if (mst != NULL) { 233 KASSERT(m->m_pkthdr.rcvif == NULL, 234 ("trying to add a send tag to a forwarded packet")); 235 if (mst->ifp != ifp) { 236 error = EAGAIN; 237 goto done; 238 } 239 240 /* stamp send tag on mbuf */ 241 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst); 242 m->m_pkthdr.csum_flags |= CSUM_SND_TAG; 243 } 244 245 error = (*ifp->if_output)(ifp, m, (const struct sockaddr *)gw, ro); 246 247 done: 248 /* Check for route change invalidating send tags. */ 249 #ifdef RATELIMIT 250 if (error == EAGAIN) 251 in_pcboutput_eagain(inp); 252 #endif 253 return (error); 254 } 255 256 /* 257 * IP output. The packet in mbuf chain m contains a skeletal IP 258 * header (with len, off, ttl, proto, tos, src, dst). 259 * The mbuf chain containing the packet will be freed. 260 * The mbuf opt, if present, will not be freed. 261 * If route ro is present and has ro_rt initialized, route lookup would be 262 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 263 * then result of route lookup is stored in ro->ro_rt. 264 * 265 * In the IP forwarding case, the packet will arrive with options already 266 * inserted, so must have a NULL opt pointer. 267 */ 268 int 269 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags, 270 struct ip_moptions *imo, struct inpcb *inp) 271 { 272 struct rm_priotracker in_ifa_tracker; 273 struct epoch_tracker et; 274 struct ip *ip; 275 struct ifnet *ifp = NULL; /* keep compiler happy */ 276 struct mbuf *m0; 277 int hlen = sizeof (struct ip); 278 int mtu; 279 int error = 0; 280 struct sockaddr_in *dst, sin; 281 const struct sockaddr_in *gw; 282 struct in_ifaddr *ia; 283 struct in_addr src; 284 int isbroadcast; 285 uint16_t ip_len, ip_off; 286 uint32_t fibnum; 287 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 288 int no_route_but_check_spd = 0; 289 #endif 290 291 M_ASSERTPKTHDR(m); 292 293 if (inp != NULL) { 294 INP_LOCK_ASSERT(inp); 295 M_SETFIB(m, inp->inp_inc.inc_fibnum); 296 if ((flags & IP_NODEFAULTFLOWID) == 0) { 297 m->m_pkthdr.flowid = inp->inp_flowid; 298 M_HASHTYPE_SET(m, inp->inp_flowtype); 299 } 300 #ifdef NUMA 301 m->m_pkthdr.numa_domain = inp->inp_numa_domain; 302 #endif 303 } 304 305 if (opt) { 306 int len = 0; 307 m = ip_insertoptions(m, opt, &len); 308 if (len != 0) 309 hlen = len; /* ip->ip_hl is updated above */ 310 } 311 ip = mtod(m, struct ip *); 312 ip_len = ntohs(ip->ip_len); 313 ip_off = ntohs(ip->ip_off); 314 315 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 316 ip->ip_v = IPVERSION; 317 ip->ip_hl = hlen >> 2; 318 ip_fillid(ip); 319 } else { 320 /* Header already set, fetch hlen from there */ 321 hlen = ip->ip_hl << 2; 322 } 323 if ((flags & IP_FORWARDING) == 0) 324 IPSTAT_INC(ips_localout); 325 326 /* 327 * dst/gw handling: 328 * 329 * gw is readonly but can point either to dst OR rt_gateway, 330 * therefore we need restore gw if we're redoing lookup. 331 */ 332 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 333 if (ro != NULL) 334 dst = (struct sockaddr_in *)&ro->ro_dst; 335 else 336 dst = &sin; 337 if (ro == NULL || ro->ro_rt == NULL) { 338 bzero(dst, sizeof(*dst)); 339 dst->sin_family = AF_INET; 340 dst->sin_len = sizeof(*dst); 341 dst->sin_addr = ip->ip_dst; 342 } 343 gw = dst; 344 NET_EPOCH_ENTER(et); 345 again: 346 /* 347 * Validate route against routing table additions; 348 * a better/more specific route might have been added. 349 */ 350 if (inp != NULL && ro != NULL && ro->ro_rt != NULL) 351 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum); 352 /* 353 * If there is a cached route, 354 * check that it is to the same destination 355 * and is still up. If not, free it and try again. 356 * The address family should also be checked in case of sharing the 357 * cache with IPv6. 358 * Also check whether routing cache needs invalidation. 359 */ 360 if (ro != NULL && ro->ro_rt != NULL && 361 ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 362 ro->ro_rt->rt_ifp == NULL || !RT_LINK_IS_UP(ro->ro_rt->rt_ifp) || 363 dst->sin_family != AF_INET || 364 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) 365 RO_INVALIDATE_CACHE(ro); 366 ia = NULL; 367 /* 368 * If routing to interface only, short circuit routing lookup. 369 * The use of an all-ones broadcast address implies this; an 370 * interface is specified by the broadcast address of an interface, 371 * or the destination address of a ptp interface. 372 */ 373 if (flags & IP_SENDONES) { 374 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst), 375 M_GETFIB(m)))) == NULL && 376 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 377 M_GETFIB(m)))) == NULL) { 378 IPSTAT_INC(ips_noroute); 379 error = ENETUNREACH; 380 goto bad; 381 } 382 ip->ip_dst.s_addr = INADDR_BROADCAST; 383 dst->sin_addr = ip->ip_dst; 384 ifp = ia->ia_ifp; 385 mtu = ifp->if_mtu; 386 ip->ip_ttl = 1; 387 isbroadcast = 1; 388 src = IA_SIN(ia)->sin_addr; 389 } else if (flags & IP_ROUTETOIF) { 390 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 391 M_GETFIB(m)))) == NULL && 392 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0, 393 M_GETFIB(m)))) == NULL) { 394 IPSTAT_INC(ips_noroute); 395 error = ENETUNREACH; 396 goto bad; 397 } 398 ifp = ia->ia_ifp; 399 mtu = ifp->if_mtu; 400 ip->ip_ttl = 1; 401 isbroadcast = ifp->if_flags & IFF_BROADCAST ? 402 in_ifaddr_broadcast(dst->sin_addr, ia) : 0; 403 src = IA_SIN(ia)->sin_addr; 404 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 405 imo != NULL && imo->imo_multicast_ifp != NULL) { 406 /* 407 * Bypass the normal routing lookup for multicast 408 * packets if the interface is specified. 409 */ 410 ifp = imo->imo_multicast_ifp; 411 mtu = ifp->if_mtu; 412 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 413 isbroadcast = 0; /* fool gcc */ 414 /* Interface may have no addresses. */ 415 if (ia != NULL) 416 src = IA_SIN(ia)->sin_addr; 417 else 418 src.s_addr = INADDR_ANY; 419 } else if (ro != NULL) { 420 if (ro->ro_rt == NULL) { 421 /* 422 * We want to do any cloning requested by the link 423 * layer, as this is probably required in all cases 424 * for correct operation (as it is for ARP). 425 */ 426 #ifdef RADIX_MPATH 427 rtalloc_mpath_fib(ro, 428 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), 429 fibnum); 430 #else 431 in_rtalloc_ign(ro, 0, fibnum); 432 #endif 433 if (ro->ro_rt == NULL || 434 (ro->ro_rt->rt_flags & RTF_UP) == 0 || 435 ro->ro_rt->rt_ifp == NULL || 436 !RT_LINK_IS_UP(ro->ro_rt->rt_ifp)) { 437 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 438 /* 439 * There is no route for this packet, but it is 440 * possible that a matching SPD entry exists. 441 */ 442 no_route_but_check_spd = 1; 443 mtu = 0; /* Silence GCC warning. */ 444 goto sendit; 445 #endif 446 IPSTAT_INC(ips_noroute); 447 error = EHOSTUNREACH; 448 goto bad; 449 } 450 } 451 ia = ifatoia(ro->ro_rt->rt_ifa); 452 ifp = ro->ro_rt->rt_ifp; 453 counter_u64_add(ro->ro_rt->rt_pksent, 1); 454 rt_update_ro_flags(ro); 455 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 456 gw = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 457 if (ro->ro_rt->rt_flags & RTF_HOST) 458 isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST); 459 else if (ifp->if_flags & IFF_BROADCAST) 460 isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia); 461 else 462 isbroadcast = 0; 463 if (ro->ro_rt->rt_flags & RTF_HOST) 464 mtu = ro->ro_rt->rt_mtu; 465 else 466 mtu = ifp->if_mtu; 467 src = IA_SIN(ia)->sin_addr; 468 } else { 469 struct nhop4_extended nh; 470 471 bzero(&nh, sizeof(nh)); 472 if (fib4_lookup_nh_ext(M_GETFIB(m), ip->ip_dst, 0, 0, &nh) != 473 0) { 474 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 475 /* 476 * There is no route for this packet, but it is 477 * possible that a matching SPD entry exists. 478 */ 479 no_route_but_check_spd = 1; 480 mtu = 0; /* Silence GCC warning. */ 481 goto sendit; 482 #endif 483 IPSTAT_INC(ips_noroute); 484 error = EHOSTUNREACH; 485 goto bad; 486 } 487 ifp = nh.nh_ifp; 488 mtu = nh.nh_mtu; 489 /* 490 * We are rewriting here dst to be gw actually, contradicting 491 * comment at the beginning of the function. However, in this 492 * case we are always dealing with on stack dst. 493 * In case if pfil(9) sends us back to beginning of the 494 * function, the dst would be rewritten by ip_output_pfil(). 495 */ 496 MPASS(dst == &sin); 497 dst->sin_addr = nh.nh_addr; 498 ia = nh.nh_ia; 499 src = nh.nh_src; 500 isbroadcast = (((nh.nh_flags & (NHF_HOST | NHF_BROADCAST)) == 501 (NHF_HOST | NHF_BROADCAST)) || 502 ((ifp->if_flags & IFF_BROADCAST) && 503 in_ifaddr_broadcast(dst->sin_addr, ia))); 504 } 505 506 /* Catch a possible divide by zero later. */ 507 KASSERT(mtu > 0, ("%s: mtu %d <= 0, ro=%p (rt_flags=0x%08x) ifp=%p", 508 __func__, mtu, ro, 509 (ro != NULL && ro->ro_rt != NULL) ? ro->ro_rt->rt_flags : 0, ifp)); 510 511 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 512 m->m_flags |= M_MCAST; 513 /* 514 * IP destination address is multicast. Make sure "gw" 515 * still points to the address in "ro". (It may have been 516 * changed to point to a gateway address, above.) 517 */ 518 gw = dst; 519 /* 520 * See if the caller provided any multicast options 521 */ 522 if (imo != NULL) { 523 ip->ip_ttl = imo->imo_multicast_ttl; 524 if (imo->imo_multicast_vif != -1) 525 ip->ip_src.s_addr = 526 ip_mcast_src ? 527 ip_mcast_src(imo->imo_multicast_vif) : 528 INADDR_ANY; 529 } else 530 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 531 /* 532 * Confirm that the outgoing interface supports multicast. 533 */ 534 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 535 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 536 IPSTAT_INC(ips_noroute); 537 error = ENETUNREACH; 538 goto bad; 539 } 540 } 541 /* 542 * If source address not specified yet, use address 543 * of outgoing interface. 544 */ 545 if (ip->ip_src.s_addr == INADDR_ANY) 546 ip->ip_src = src; 547 548 if ((imo == NULL && in_mcast_loop) || 549 (imo && imo->imo_multicast_loop)) { 550 /* 551 * Loop back multicast datagram if not expressly 552 * forbidden to do so, even if we are not a member 553 * of the group; ip_input() will filter it later, 554 * thus deferring a hash lookup and mutex acquisition 555 * at the expense of a cheap copy using m_copym(). 556 */ 557 ip_mloopback(ifp, m, hlen); 558 } else { 559 /* 560 * If we are acting as a multicast router, perform 561 * multicast forwarding as if the packet had just 562 * arrived on the interface to which we are about 563 * to send. The multicast forwarding function 564 * recursively calls this function, using the 565 * IP_FORWARDING flag to prevent infinite recursion. 566 * 567 * Multicasts that are looped back by ip_mloopback(), 568 * above, will be forwarded by the ip_input() routine, 569 * if necessary. 570 */ 571 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) { 572 /* 573 * If rsvp daemon is not running, do not 574 * set ip_moptions. This ensures that the packet 575 * is multicast and not just sent down one link 576 * as prescribed by rsvpd. 577 */ 578 if (!V_rsvp_on) 579 imo = NULL; 580 if (ip_mforward && 581 ip_mforward(ip, ifp, m, imo) != 0) { 582 m_freem(m); 583 goto done; 584 } 585 } 586 } 587 588 /* 589 * Multicasts with a time-to-live of zero may be looped- 590 * back, above, but must not be transmitted on a network. 591 * Also, multicasts addressed to the loopback interface 592 * are not sent -- the above call to ip_mloopback() will 593 * loop back a copy. ip_input() will drop the copy if 594 * this host does not belong to the destination group on 595 * the loopback interface. 596 */ 597 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 598 m_freem(m); 599 goto done; 600 } 601 602 goto sendit; 603 } 604 605 /* 606 * If the source address is not specified yet, use the address 607 * of the outoing interface. 608 */ 609 if (ip->ip_src.s_addr == INADDR_ANY) 610 ip->ip_src = src; 611 612 /* 613 * Look for broadcast address and 614 * verify user is allowed to send 615 * such a packet. 616 */ 617 if (isbroadcast) { 618 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 619 error = EADDRNOTAVAIL; 620 goto bad; 621 } 622 if ((flags & IP_ALLOWBROADCAST) == 0) { 623 error = EACCES; 624 goto bad; 625 } 626 /* don't allow broadcast messages to be fragmented */ 627 if (ip_len > mtu) { 628 error = EMSGSIZE; 629 goto bad; 630 } 631 m->m_flags |= M_BCAST; 632 } else { 633 m->m_flags &= ~M_BCAST; 634 } 635 636 sendit: 637 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 638 if (IPSEC_ENABLED(ipv4)) { 639 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) { 640 if (error == EINPROGRESS) 641 error = 0; 642 goto done; 643 } 644 } 645 /* 646 * Check if there was a route for this packet; return error if not. 647 */ 648 if (no_route_but_check_spd) { 649 IPSTAT_INC(ips_noroute); 650 error = EHOSTUNREACH; 651 goto bad; 652 } 653 /* Update variables that are affected by ipsec4_output(). */ 654 ip = mtod(m, struct ip *); 655 hlen = ip->ip_hl << 2; 656 #endif /* IPSEC */ 657 658 /* Jump over all PFIL processing if hooks are not active. */ 659 if (PFIL_HOOKED_OUT(V_inet_pfil_head)) { 660 switch (ip_output_pfil(&m, ifp, flags, inp, dst, &fibnum, 661 &error)) { 662 case 1: /* Finished */ 663 goto done; 664 665 case 0: /* Continue normally */ 666 ip = mtod(m, struct ip *); 667 break; 668 669 case -1: /* Need to try again */ 670 /* Reset everything for a new round */ 671 if (ro != NULL) { 672 RO_RTFREE(ro); 673 ro->ro_prepend = NULL; 674 } 675 gw = dst; 676 ip = mtod(m, struct ip *); 677 goto again; 678 679 } 680 } 681 682 /* IN_LOOPBACK must not appear on the wire - RFC1122. */ 683 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 684 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 685 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 686 IPSTAT_INC(ips_badaddr); 687 error = EADDRNOTAVAIL; 688 goto bad; 689 } 690 } 691 692 m->m_pkthdr.csum_flags |= CSUM_IP; 693 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 694 in_delayed_cksum(m); 695 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 696 } 697 #ifdef SCTP 698 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 699 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 700 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 701 } 702 #endif 703 704 /* 705 * If small enough for interface, or the interface will take 706 * care of the fragmentation for us, we can just send directly. 707 */ 708 if (ip_len <= mtu || 709 (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 710 ip->ip_sum = 0; 711 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 712 ip->ip_sum = in_cksum(m, hlen); 713 m->m_pkthdr.csum_flags &= ~CSUM_IP; 714 } 715 716 /* 717 * Record statistics for this interface address. 718 * With CSUM_TSO the byte/packet count will be slightly 719 * incorrect because we count the IP+TCP headers only 720 * once instead of for every generated packet. 721 */ 722 if (!(flags & IP_FORWARDING) && ia) { 723 if (m->m_pkthdr.csum_flags & CSUM_TSO) 724 counter_u64_add(ia->ia_ifa.ifa_opackets, 725 m->m_pkthdr.len / m->m_pkthdr.tso_segsz); 726 else 727 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 728 729 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len); 730 } 731 #ifdef MBUF_STRESS_TEST 732 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 733 m = m_fragment(m, M_NOWAIT, mbuf_frag_size); 734 #endif 735 /* 736 * Reset layer specific mbuf flags 737 * to avoid confusing lower layers. 738 */ 739 m_clrprotoflags(m); 740 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 741 error = ip_output_send(inp, ifp, m, gw, ro); 742 goto done; 743 } 744 745 /* Balk when DF bit is set or the interface didn't support TSO. */ 746 if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) { 747 error = EMSGSIZE; 748 IPSTAT_INC(ips_cantfrag); 749 goto bad; 750 } 751 752 /* 753 * Too large for interface; fragment if possible. If successful, 754 * on return, m will point to a list of packets to be sent. 755 */ 756 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist); 757 if (error) 758 goto bad; 759 for (; m; m = m0) { 760 m0 = m->m_nextpkt; 761 m->m_nextpkt = 0; 762 if (error == 0) { 763 /* Record statistics for this interface address. */ 764 if (ia != NULL) { 765 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 766 counter_u64_add(ia->ia_ifa.ifa_obytes, 767 m->m_pkthdr.len); 768 } 769 /* 770 * Reset layer specific mbuf flags 771 * to avoid confusing upper layers. 772 */ 773 m_clrprotoflags(m); 774 775 IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp, 776 mtod(m, struct ip *), NULL); 777 error = ip_output_send(inp, ifp, m, gw, ro); 778 } else 779 m_freem(m); 780 } 781 782 if (error == 0) 783 IPSTAT_INC(ips_fragmented); 784 785 done: 786 NET_EPOCH_EXIT(et); 787 return (error); 788 bad: 789 m_freem(m); 790 goto done; 791 } 792 793 /* 794 * Create a chain of fragments which fit the given mtu. m_frag points to the 795 * mbuf to be fragmented; on return it points to the chain with the fragments. 796 * Return 0 if no error. If error, m_frag may contain a partially built 797 * chain of fragments that should be freed by the caller. 798 * 799 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist) 800 */ 801 int 802 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 803 u_long if_hwassist_flags) 804 { 805 int error = 0; 806 int hlen = ip->ip_hl << 2; 807 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */ 808 int off; 809 struct mbuf *m0 = *m_frag; /* the original packet */ 810 int firstlen; 811 struct mbuf **mnext; 812 int nfrags; 813 uint16_t ip_len, ip_off; 814 815 ip_len = ntohs(ip->ip_len); 816 ip_off = ntohs(ip->ip_off); 817 818 if (ip_off & IP_DF) { /* Fragmentation not allowed */ 819 IPSTAT_INC(ips_cantfrag); 820 return EMSGSIZE; 821 } 822 823 /* 824 * Must be able to put at least 8 bytes per fragment. 825 */ 826 if (len < 8) 827 return EMSGSIZE; 828 829 /* 830 * If the interface will not calculate checksums on 831 * fragmented packets, then do it here. 832 */ 833 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 834 in_delayed_cksum(m0); 835 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 836 } 837 #ifdef SCTP 838 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) { 839 sctp_delayed_cksum(m0, hlen); 840 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 841 } 842 #endif 843 if (len > PAGE_SIZE) { 844 /* 845 * Fragment large datagrams such that each segment 846 * contains a multiple of PAGE_SIZE amount of data, 847 * plus headers. This enables a receiver to perform 848 * page-flipping zero-copy optimizations. 849 * 850 * XXX When does this help given that sender and receiver 851 * could have different page sizes, and also mtu could 852 * be less than the receiver's page size ? 853 */ 854 int newlen; 855 856 off = MIN(mtu, m0->m_pkthdr.len); 857 858 /* 859 * firstlen (off - hlen) must be aligned on an 860 * 8-byte boundary 861 */ 862 if (off < hlen) 863 goto smart_frag_failure; 864 off = ((off - hlen) & ~7) + hlen; 865 newlen = (~PAGE_MASK) & mtu; 866 if ((newlen + sizeof (struct ip)) > mtu) { 867 /* we failed, go back the default */ 868 smart_frag_failure: 869 newlen = len; 870 off = hlen + len; 871 } 872 len = newlen; 873 874 } else { 875 off = hlen + len; 876 } 877 878 firstlen = off - hlen; 879 mnext = &m0->m_nextpkt; /* pointer to next packet */ 880 881 /* 882 * Loop through length of segment after first fragment, 883 * make new header and copy data of each part and link onto chain. 884 * Here, m0 is the original packet, m is the fragment being created. 885 * The fragments are linked off the m_nextpkt of the original 886 * packet, which after processing serves as the first fragment. 887 */ 888 for (nfrags = 1; off < ip_len; off += len, nfrags++) { 889 struct ip *mhip; /* ip header on the fragment */ 890 struct mbuf *m; 891 int mhlen = sizeof (struct ip); 892 893 m = m_gethdr(M_NOWAIT, MT_DATA); 894 if (m == NULL) { 895 error = ENOBUFS; 896 IPSTAT_INC(ips_odropped); 897 goto done; 898 } 899 /* 900 * Make sure the complete packet header gets copied 901 * from the originating mbuf to the newly created 902 * mbuf. This also ensures that existing firewall 903 * classification(s), VLAN tags and so on get copied 904 * to the resulting fragmented packet(s): 905 */ 906 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) { 907 m_free(m); 908 error = ENOBUFS; 909 IPSTAT_INC(ips_odropped); 910 goto done; 911 } 912 /* 913 * In the first mbuf, leave room for the link header, then 914 * copy the original IP header including options. The payload 915 * goes into an additional mbuf chain returned by m_copym(). 916 */ 917 m->m_data += max_linkhdr; 918 mhip = mtod(m, struct ip *); 919 *mhip = *ip; 920 if (hlen > sizeof (struct ip)) { 921 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 922 mhip->ip_v = IPVERSION; 923 mhip->ip_hl = mhlen >> 2; 924 } 925 m->m_len = mhlen; 926 /* XXX do we need to add ip_off below ? */ 927 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 928 if (off + len >= ip_len) 929 len = ip_len - off; 930 else 931 mhip->ip_off |= IP_MF; 932 mhip->ip_len = htons((u_short)(len + mhlen)); 933 m->m_next = m_copym(m0, off, len, M_NOWAIT); 934 if (m->m_next == NULL) { /* copy failed */ 935 m_free(m); 936 error = ENOBUFS; /* ??? */ 937 IPSTAT_INC(ips_odropped); 938 goto done; 939 } 940 m->m_pkthdr.len = mhlen + len; 941 #ifdef MAC 942 mac_netinet_fragment(m0, m); 943 #endif 944 mhip->ip_off = htons(mhip->ip_off); 945 mhip->ip_sum = 0; 946 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 947 mhip->ip_sum = in_cksum(m, mhlen); 948 m->m_pkthdr.csum_flags &= ~CSUM_IP; 949 } 950 *mnext = m; 951 mnext = &m->m_nextpkt; 952 } 953 IPSTAT_ADD(ips_ofragments, nfrags); 954 955 /* 956 * Update first fragment by trimming what's been copied out 957 * and updating header. 958 */ 959 m_adj(m0, hlen + firstlen - ip_len); 960 m0->m_pkthdr.len = hlen + firstlen; 961 ip->ip_len = htons((u_short)m0->m_pkthdr.len); 962 ip->ip_off = htons(ip_off | IP_MF); 963 ip->ip_sum = 0; 964 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 965 ip->ip_sum = in_cksum(m0, hlen); 966 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 967 } 968 969 done: 970 *m_frag = m0; 971 return error; 972 } 973 974 void 975 in_delayed_cksum(struct mbuf *m) 976 { 977 struct ip *ip; 978 struct udphdr *uh; 979 uint16_t cklen, csum, offset; 980 981 ip = mtod(m, struct ip *); 982 offset = ip->ip_hl << 2 ; 983 984 if (m->m_pkthdr.csum_flags & CSUM_UDP) { 985 /* if udp header is not in the first mbuf copy udplen */ 986 if (offset + sizeof(struct udphdr) > m->m_len) { 987 m_copydata(m, offset + offsetof(struct udphdr, 988 uh_ulen), sizeof(cklen), (caddr_t)&cklen); 989 cklen = ntohs(cklen); 990 } else { 991 uh = (struct udphdr *)mtodo(m, offset); 992 cklen = ntohs(uh->uh_ulen); 993 } 994 csum = in_cksum_skip(m, cklen + offset, offset); 995 if (csum == 0) 996 csum = 0xffff; 997 } else { 998 cklen = ntohs(ip->ip_len); 999 csum = in_cksum_skip(m, cklen, offset); 1000 } 1001 offset += m->m_pkthdr.csum_data; /* checksum offset */ 1002 1003 if (offset + sizeof(csum) > m->m_len) 1004 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum); 1005 else 1006 *(u_short *)mtodo(m, offset) = csum; 1007 } 1008 1009 /* 1010 * IP socket option processing. 1011 */ 1012 int 1013 ip_ctloutput(struct socket *so, struct sockopt *sopt) 1014 { 1015 struct inpcb *inp = sotoinpcb(so); 1016 int error, optval; 1017 #ifdef RSS 1018 uint32_t rss_bucket; 1019 int retval; 1020 #endif 1021 1022 error = optval = 0; 1023 if (sopt->sopt_level != IPPROTO_IP) { 1024 error = EINVAL; 1025 1026 if (sopt->sopt_level == SOL_SOCKET && 1027 sopt->sopt_dir == SOPT_SET) { 1028 switch (sopt->sopt_name) { 1029 case SO_REUSEADDR: 1030 INP_WLOCK(inp); 1031 if ((so->so_options & SO_REUSEADDR) != 0) 1032 inp->inp_flags2 |= INP_REUSEADDR; 1033 else 1034 inp->inp_flags2 &= ~INP_REUSEADDR; 1035 INP_WUNLOCK(inp); 1036 error = 0; 1037 break; 1038 case SO_REUSEPORT: 1039 INP_WLOCK(inp); 1040 if ((so->so_options & SO_REUSEPORT) != 0) 1041 inp->inp_flags2 |= INP_REUSEPORT; 1042 else 1043 inp->inp_flags2 &= ~INP_REUSEPORT; 1044 INP_WUNLOCK(inp); 1045 error = 0; 1046 break; 1047 case SO_REUSEPORT_LB: 1048 INP_WLOCK(inp); 1049 if ((so->so_options & SO_REUSEPORT_LB) != 0) 1050 inp->inp_flags2 |= INP_REUSEPORT_LB; 1051 else 1052 inp->inp_flags2 &= ~INP_REUSEPORT_LB; 1053 INP_WUNLOCK(inp); 1054 error = 0; 1055 break; 1056 case SO_SETFIB: 1057 INP_WLOCK(inp); 1058 inp->inp_inc.inc_fibnum = so->so_fibnum; 1059 INP_WUNLOCK(inp); 1060 error = 0; 1061 break; 1062 case SO_MAX_PACING_RATE: 1063 #ifdef RATELIMIT 1064 INP_WLOCK(inp); 1065 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 1066 INP_WUNLOCK(inp); 1067 error = 0; 1068 #else 1069 error = EOPNOTSUPP; 1070 #endif 1071 break; 1072 default: 1073 break; 1074 } 1075 } 1076 return (error); 1077 } 1078 1079 switch (sopt->sopt_dir) { 1080 case SOPT_SET: 1081 switch (sopt->sopt_name) { 1082 case IP_OPTIONS: 1083 #ifdef notyet 1084 case IP_RETOPTS: 1085 #endif 1086 { 1087 struct mbuf *m; 1088 if (sopt->sopt_valsize > MLEN) { 1089 error = EMSGSIZE; 1090 break; 1091 } 1092 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA); 1093 if (m == NULL) { 1094 error = ENOBUFS; 1095 break; 1096 } 1097 m->m_len = sopt->sopt_valsize; 1098 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 1099 m->m_len); 1100 if (error) { 1101 m_free(m); 1102 break; 1103 } 1104 INP_WLOCK(inp); 1105 error = ip_pcbopts(inp, sopt->sopt_name, m); 1106 INP_WUNLOCK(inp); 1107 return (error); 1108 } 1109 1110 case IP_BINDANY: 1111 if (sopt->sopt_td != NULL) { 1112 error = priv_check(sopt->sopt_td, 1113 PRIV_NETINET_BINDANY); 1114 if (error) 1115 break; 1116 } 1117 /* FALLTHROUGH */ 1118 case IP_BINDMULTI: 1119 #ifdef RSS 1120 case IP_RSS_LISTEN_BUCKET: 1121 #endif 1122 case IP_TOS: 1123 case IP_TTL: 1124 case IP_MINTTL: 1125 case IP_RECVOPTS: 1126 case IP_RECVRETOPTS: 1127 case IP_ORIGDSTADDR: 1128 case IP_RECVDSTADDR: 1129 case IP_RECVTTL: 1130 case IP_RECVIF: 1131 case IP_ONESBCAST: 1132 case IP_DONTFRAG: 1133 case IP_RECVTOS: 1134 case IP_RECVFLOWID: 1135 #ifdef RSS 1136 case IP_RECVRSSBUCKETID: 1137 #endif 1138 error = sooptcopyin(sopt, &optval, sizeof optval, 1139 sizeof optval); 1140 if (error) 1141 break; 1142 1143 switch (sopt->sopt_name) { 1144 case IP_TOS: 1145 inp->inp_ip_tos = optval; 1146 break; 1147 1148 case IP_TTL: 1149 inp->inp_ip_ttl = optval; 1150 break; 1151 1152 case IP_MINTTL: 1153 if (optval >= 0 && optval <= MAXTTL) 1154 inp->inp_ip_minttl = optval; 1155 else 1156 error = EINVAL; 1157 break; 1158 1159 #define OPTSET(bit) do { \ 1160 INP_WLOCK(inp); \ 1161 if (optval) \ 1162 inp->inp_flags |= bit; \ 1163 else \ 1164 inp->inp_flags &= ~bit; \ 1165 INP_WUNLOCK(inp); \ 1166 } while (0) 1167 1168 #define OPTSET2(bit, val) do { \ 1169 INP_WLOCK(inp); \ 1170 if (val) \ 1171 inp->inp_flags2 |= bit; \ 1172 else \ 1173 inp->inp_flags2 &= ~bit; \ 1174 INP_WUNLOCK(inp); \ 1175 } while (0) 1176 1177 case IP_RECVOPTS: 1178 OPTSET(INP_RECVOPTS); 1179 break; 1180 1181 case IP_RECVRETOPTS: 1182 OPTSET(INP_RECVRETOPTS); 1183 break; 1184 1185 case IP_RECVDSTADDR: 1186 OPTSET(INP_RECVDSTADDR); 1187 break; 1188 1189 case IP_ORIGDSTADDR: 1190 OPTSET2(INP_ORIGDSTADDR, optval); 1191 break; 1192 1193 case IP_RECVTTL: 1194 OPTSET(INP_RECVTTL); 1195 break; 1196 1197 case IP_RECVIF: 1198 OPTSET(INP_RECVIF); 1199 break; 1200 1201 case IP_ONESBCAST: 1202 OPTSET(INP_ONESBCAST); 1203 break; 1204 case IP_DONTFRAG: 1205 OPTSET(INP_DONTFRAG); 1206 break; 1207 case IP_BINDANY: 1208 OPTSET(INP_BINDANY); 1209 break; 1210 case IP_RECVTOS: 1211 OPTSET(INP_RECVTOS); 1212 break; 1213 case IP_BINDMULTI: 1214 OPTSET2(INP_BINDMULTI, optval); 1215 break; 1216 case IP_RECVFLOWID: 1217 OPTSET2(INP_RECVFLOWID, optval); 1218 break; 1219 #ifdef RSS 1220 case IP_RSS_LISTEN_BUCKET: 1221 if ((optval >= 0) && 1222 (optval < rss_getnumbuckets())) { 1223 inp->inp_rss_listen_bucket = optval; 1224 OPTSET2(INP_RSS_BUCKET_SET, 1); 1225 } else { 1226 error = EINVAL; 1227 } 1228 break; 1229 case IP_RECVRSSBUCKETID: 1230 OPTSET2(INP_RECVRSSBUCKETID, optval); 1231 break; 1232 #endif 1233 } 1234 break; 1235 #undef OPTSET 1236 #undef OPTSET2 1237 1238 /* 1239 * Multicast socket options are processed by the in_mcast 1240 * module. 1241 */ 1242 case IP_MULTICAST_IF: 1243 case IP_MULTICAST_VIF: 1244 case IP_MULTICAST_TTL: 1245 case IP_MULTICAST_LOOP: 1246 case IP_ADD_MEMBERSHIP: 1247 case IP_DROP_MEMBERSHIP: 1248 case IP_ADD_SOURCE_MEMBERSHIP: 1249 case IP_DROP_SOURCE_MEMBERSHIP: 1250 case IP_BLOCK_SOURCE: 1251 case IP_UNBLOCK_SOURCE: 1252 case IP_MSFILTER: 1253 case MCAST_JOIN_GROUP: 1254 case MCAST_LEAVE_GROUP: 1255 case MCAST_JOIN_SOURCE_GROUP: 1256 case MCAST_LEAVE_SOURCE_GROUP: 1257 case MCAST_BLOCK_SOURCE: 1258 case MCAST_UNBLOCK_SOURCE: 1259 error = inp_setmoptions(inp, sopt); 1260 break; 1261 1262 case IP_PORTRANGE: 1263 error = sooptcopyin(sopt, &optval, sizeof optval, 1264 sizeof optval); 1265 if (error) 1266 break; 1267 1268 INP_WLOCK(inp); 1269 switch (optval) { 1270 case IP_PORTRANGE_DEFAULT: 1271 inp->inp_flags &= ~(INP_LOWPORT); 1272 inp->inp_flags &= ~(INP_HIGHPORT); 1273 break; 1274 1275 case IP_PORTRANGE_HIGH: 1276 inp->inp_flags &= ~(INP_LOWPORT); 1277 inp->inp_flags |= INP_HIGHPORT; 1278 break; 1279 1280 case IP_PORTRANGE_LOW: 1281 inp->inp_flags &= ~(INP_HIGHPORT); 1282 inp->inp_flags |= INP_LOWPORT; 1283 break; 1284 1285 default: 1286 error = EINVAL; 1287 break; 1288 } 1289 INP_WUNLOCK(inp); 1290 break; 1291 1292 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1293 case IP_IPSEC_POLICY: 1294 if (IPSEC_ENABLED(ipv4)) { 1295 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1296 break; 1297 } 1298 /* FALLTHROUGH */ 1299 #endif /* IPSEC */ 1300 1301 default: 1302 error = ENOPROTOOPT; 1303 break; 1304 } 1305 break; 1306 1307 case SOPT_GET: 1308 switch (sopt->sopt_name) { 1309 case IP_OPTIONS: 1310 case IP_RETOPTS: 1311 INP_RLOCK(inp); 1312 if (inp->inp_options) { 1313 struct mbuf *options; 1314 1315 options = m_copym(inp->inp_options, 0, 1316 M_COPYALL, M_NOWAIT); 1317 INP_RUNLOCK(inp); 1318 if (options != NULL) { 1319 error = sooptcopyout(sopt, 1320 mtod(options, char *), 1321 options->m_len); 1322 m_freem(options); 1323 } else 1324 error = ENOMEM; 1325 } else { 1326 INP_RUNLOCK(inp); 1327 sopt->sopt_valsize = 0; 1328 } 1329 break; 1330 1331 case IP_TOS: 1332 case IP_TTL: 1333 case IP_MINTTL: 1334 case IP_RECVOPTS: 1335 case IP_RECVRETOPTS: 1336 case IP_ORIGDSTADDR: 1337 case IP_RECVDSTADDR: 1338 case IP_RECVTTL: 1339 case IP_RECVIF: 1340 case IP_PORTRANGE: 1341 case IP_ONESBCAST: 1342 case IP_DONTFRAG: 1343 case IP_BINDANY: 1344 case IP_RECVTOS: 1345 case IP_BINDMULTI: 1346 case IP_FLOWID: 1347 case IP_FLOWTYPE: 1348 case IP_RECVFLOWID: 1349 #ifdef RSS 1350 case IP_RSSBUCKETID: 1351 case IP_RECVRSSBUCKETID: 1352 #endif 1353 switch (sopt->sopt_name) { 1354 1355 case IP_TOS: 1356 optval = inp->inp_ip_tos; 1357 break; 1358 1359 case IP_TTL: 1360 optval = inp->inp_ip_ttl; 1361 break; 1362 1363 case IP_MINTTL: 1364 optval = inp->inp_ip_minttl; 1365 break; 1366 1367 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1368 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0) 1369 1370 case IP_RECVOPTS: 1371 optval = OPTBIT(INP_RECVOPTS); 1372 break; 1373 1374 case IP_RECVRETOPTS: 1375 optval = OPTBIT(INP_RECVRETOPTS); 1376 break; 1377 1378 case IP_RECVDSTADDR: 1379 optval = OPTBIT(INP_RECVDSTADDR); 1380 break; 1381 1382 case IP_ORIGDSTADDR: 1383 optval = OPTBIT2(INP_ORIGDSTADDR); 1384 break; 1385 1386 case IP_RECVTTL: 1387 optval = OPTBIT(INP_RECVTTL); 1388 break; 1389 1390 case IP_RECVIF: 1391 optval = OPTBIT(INP_RECVIF); 1392 break; 1393 1394 case IP_PORTRANGE: 1395 if (inp->inp_flags & INP_HIGHPORT) 1396 optval = IP_PORTRANGE_HIGH; 1397 else if (inp->inp_flags & INP_LOWPORT) 1398 optval = IP_PORTRANGE_LOW; 1399 else 1400 optval = 0; 1401 break; 1402 1403 case IP_ONESBCAST: 1404 optval = OPTBIT(INP_ONESBCAST); 1405 break; 1406 case IP_DONTFRAG: 1407 optval = OPTBIT(INP_DONTFRAG); 1408 break; 1409 case IP_BINDANY: 1410 optval = OPTBIT(INP_BINDANY); 1411 break; 1412 case IP_RECVTOS: 1413 optval = OPTBIT(INP_RECVTOS); 1414 break; 1415 case IP_FLOWID: 1416 optval = inp->inp_flowid; 1417 break; 1418 case IP_FLOWTYPE: 1419 optval = inp->inp_flowtype; 1420 break; 1421 case IP_RECVFLOWID: 1422 optval = OPTBIT2(INP_RECVFLOWID); 1423 break; 1424 #ifdef RSS 1425 case IP_RSSBUCKETID: 1426 retval = rss_hash2bucket(inp->inp_flowid, 1427 inp->inp_flowtype, 1428 &rss_bucket); 1429 if (retval == 0) 1430 optval = rss_bucket; 1431 else 1432 error = EINVAL; 1433 break; 1434 case IP_RECVRSSBUCKETID: 1435 optval = OPTBIT2(INP_RECVRSSBUCKETID); 1436 break; 1437 #endif 1438 case IP_BINDMULTI: 1439 optval = OPTBIT2(INP_BINDMULTI); 1440 break; 1441 } 1442 error = sooptcopyout(sopt, &optval, sizeof optval); 1443 break; 1444 1445 /* 1446 * Multicast socket options are processed by the in_mcast 1447 * module. 1448 */ 1449 case IP_MULTICAST_IF: 1450 case IP_MULTICAST_VIF: 1451 case IP_MULTICAST_TTL: 1452 case IP_MULTICAST_LOOP: 1453 case IP_MSFILTER: 1454 error = inp_getmoptions(inp, sopt); 1455 break; 1456 1457 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1458 case IP_IPSEC_POLICY: 1459 if (IPSEC_ENABLED(ipv4)) { 1460 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1461 break; 1462 } 1463 /* FALLTHROUGH */ 1464 #endif /* IPSEC */ 1465 1466 default: 1467 error = ENOPROTOOPT; 1468 break; 1469 } 1470 break; 1471 } 1472 return (error); 1473 } 1474 1475 /* 1476 * Routine called from ip_output() to loop back a copy of an IP multicast 1477 * packet to the input queue of a specified interface. Note that this 1478 * calls the output routine of the loopback "driver", but with an interface 1479 * pointer that might NOT be a loopback interface -- evil, but easier than 1480 * replicating that code here. 1481 */ 1482 static void 1483 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen) 1484 { 1485 struct ip *ip; 1486 struct mbuf *copym; 1487 1488 /* 1489 * Make a deep copy of the packet because we're going to 1490 * modify the pack in order to generate checksums. 1491 */ 1492 copym = m_dup(m, M_NOWAIT); 1493 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen)) 1494 copym = m_pullup(copym, hlen); 1495 if (copym != NULL) { 1496 /* If needed, compute the checksum and mark it as valid. */ 1497 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1498 in_delayed_cksum(copym); 1499 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1500 copym->m_pkthdr.csum_flags |= 1501 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1502 copym->m_pkthdr.csum_data = 0xffff; 1503 } 1504 /* 1505 * We don't bother to fragment if the IP length is greater 1506 * than the interface's MTU. Can this possibly matter? 1507 */ 1508 ip = mtod(copym, struct ip *); 1509 ip->ip_sum = 0; 1510 ip->ip_sum = in_cksum(copym, hlen); 1511 if_simloop(ifp, copym, AF_INET, 0); 1512 } 1513 } 1514