1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1988, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_inet.h" 38 #include "opt_ratelimit.h" 39 #include "opt_ipsec.h" 40 #include "opt_mbuf_stress_test.h" 41 #include "opt_mpath.h" 42 #include "opt_route.h" 43 #include "opt_sctp.h" 44 #include "opt_rss.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/lock.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/priv.h> 53 #include <sys/proc.h> 54 #include <sys/protosw.h> 55 #include <sys/rmlock.h> 56 #include <sys/sdt.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/sysctl.h> 60 #include <sys/ucred.h> 61 62 #include <net/if.h> 63 #include <net/if_var.h> 64 #include <net/if_llatbl.h> 65 #include <net/netisr.h> 66 #include <net/pfil.h> 67 #include <net/route.h> 68 #ifdef RADIX_MPATH 69 #include <net/radix_mpath.h> 70 #endif 71 #include <net/rss_config.h> 72 #include <net/vnet.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_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, struct inpcb *inp, 113 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; 119 120 m = *mp; 121 ip = mtod(m, struct ip *); 122 123 /* Run through list of hooks for output packets. */ 124 odst.s_addr = ip->ip_dst.s_addr; 125 switch (pfil_run_hooks(V_inet_pfil_head, mp, ifp, PFIL_OUT, inp)) { 126 case PFIL_DROPPED: 127 *error = EPERM; 128 /* FALLTHROUGH */ 129 case PFIL_CONSUMED: 130 return 1; /* Finished */ 131 case PFIL_PASS: 132 *error = 0; 133 } 134 m = *mp; 135 ip = mtod(m, struct ip *); 136 137 /* See if destination IP address was changed by packet filter. */ 138 if (odst.s_addr != ip->ip_dst.s_addr) { 139 m->m_flags |= M_SKIP_FIREWALL; 140 /* If destination is now ourself drop to ip_input(). */ 141 if (in_localip(ip->ip_dst)) { 142 m->m_flags |= M_FASTFWD_OURS; 143 if (m->m_pkthdr.rcvif == NULL) 144 m->m_pkthdr.rcvif = V_loif; 145 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 146 m->m_pkthdr.csum_flags |= 147 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 148 m->m_pkthdr.csum_data = 0xffff; 149 } 150 m->m_pkthdr.csum_flags |= 151 CSUM_IP_CHECKED | CSUM_IP_VALID; 152 #ifdef SCTP 153 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 154 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 155 #endif 156 *error = netisr_queue(NETISR_IP, m); 157 return 1; /* Finished */ 158 } 159 160 bzero(dst, sizeof(*dst)); 161 dst->sin_family = AF_INET; 162 dst->sin_len = sizeof(*dst); 163 dst->sin_addr = ip->ip_dst; 164 165 return -1; /* Reloop */ 166 } 167 /* See if fib was changed by packet filter. */ 168 if ((*fibnum) != M_GETFIB(m)) { 169 m->m_flags |= M_SKIP_FIREWALL; 170 *fibnum = M_GETFIB(m); 171 return -1; /* Reloop for FIB change */ 172 } 173 174 /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */ 175 if (m->m_flags & M_FASTFWD_OURS) { 176 if (m->m_pkthdr.rcvif == NULL) 177 m->m_pkthdr.rcvif = V_loif; 178 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 179 m->m_pkthdr.csum_flags |= 180 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 181 m->m_pkthdr.csum_data = 0xffff; 182 } 183 #ifdef SCTP 184 if (m->m_pkthdr.csum_flags & CSUM_SCTP) 185 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 186 #endif 187 m->m_pkthdr.csum_flags |= 188 CSUM_IP_CHECKED | CSUM_IP_VALID; 189 190 *error = netisr_queue(NETISR_IP, m); 191 return 1; /* Finished */ 192 } 193 /* Or forward to some other address? */ 194 if ((m->m_flags & M_IP_NEXTHOP) && 195 ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) { 196 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in)); 197 m->m_flags |= M_SKIP_FIREWALL; 198 m->m_flags &= ~M_IP_NEXTHOP; 199 m_tag_delete(m, fwd_tag); 200 201 return -1; /* Reloop for CHANGE of dst */ 202 } 203 204 return 0; 205 } 206 207 /* 208 * IP output. The packet in mbuf chain m contains a skeletal IP 209 * header (with len, off, ttl, proto, tos, src, dst). 210 * The mbuf chain containing the packet will be freed. 211 * The mbuf opt, if present, will not be freed. 212 * If route ro is present and has ro_rt initialized, route lookup would be 213 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 214 * then result of route lookup is stored in ro->ro_rt. 215 * 216 * In the IP forwarding case, the packet will arrive with options already 217 * inserted, so must have a NULL opt pointer. 218 */ 219 int 220 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags, 221 struct ip_moptions *imo, struct inpcb *inp) 222 { 223 struct rm_priotracker in_ifa_tracker; 224 struct epoch_tracker et; 225 struct ip *ip; 226 struct ifnet *ifp = NULL; /* keep compiler happy */ 227 struct mbuf *m0; 228 int hlen = sizeof (struct ip); 229 int mtu; 230 int error = 0; 231 struct sockaddr_in *dst, sin; 232 const struct sockaddr_in *gw; 233 struct in_ifaddr *ia; 234 struct in_addr src; 235 int isbroadcast; 236 uint16_t ip_len, ip_off; 237 uint32_t fibnum; 238 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 239 int no_route_but_check_spd = 0; 240 #endif 241 M_ASSERTPKTHDR(m); 242 243 if (inp != NULL) { 244 INP_LOCK_ASSERT(inp); 245 M_SETFIB(m, inp->inp_inc.inc_fibnum); 246 if ((flags & IP_NODEFAULTFLOWID) == 0) { 247 m->m_pkthdr.flowid = inp->inp_flowid; 248 M_HASHTYPE_SET(m, inp->inp_flowtype); 249 } 250 #ifdef NUMA 251 m->m_pkthdr.numa_domain = inp->inp_numa_domain; 252 #endif 253 } 254 255 if (opt) { 256 int len = 0; 257 m = ip_insertoptions(m, opt, &len); 258 if (len != 0) 259 hlen = len; /* ip->ip_hl is updated above */ 260 } 261 ip = mtod(m, struct ip *); 262 ip_len = ntohs(ip->ip_len); 263 ip_off = ntohs(ip->ip_off); 264 265 if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { 266 ip->ip_v = IPVERSION; 267 ip->ip_hl = hlen >> 2; 268 ip_fillid(ip); 269 } else { 270 /* Header already set, fetch hlen from there */ 271 hlen = ip->ip_hl << 2; 272 } 273 if ((flags & IP_FORWARDING) == 0) 274 IPSTAT_INC(ips_localout); 275 276 /* 277 * dst/gw handling: 278 * 279 * gw is readonly but can point either to dst OR rt_gateway, 280 * therefore we need restore gw if we're redoing lookup. 281 */ 282 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 283 if (ro != NULL) 284 dst = (struct sockaddr_in *)&ro->ro_dst; 285 else 286 dst = &sin; 287 if (ro == NULL || ro->ro_rt == NULL) { 288 bzero(dst, sizeof(*dst)); 289 dst->sin_family = AF_INET; 290 dst->sin_len = sizeof(*dst); 291 dst->sin_addr = ip->ip_dst; 292 } 293 gw = dst; 294 NET_EPOCH_ENTER(et); 295 again: 296 /* 297 * Validate route against routing table additions; 298 * a better/more specific route might have been added. 299 */ 300 if (inp != NULL && ro != NULL && ro->ro_rt != NULL) 301 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum); 302 /* 303 * If there is a cached route, 304 * check that it is to the same destination 305 * and is still up. If not, free it and try again. 306 * The address family should also be checked in case of sharing the 307 * cache with IPv6. 308 * Also check whether routing cache needs invalidation. 309 */ 310 if (ro != NULL && ro->ro_rt != NULL && 311 ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 312 ro->ro_rt->rt_ifp == NULL || !RT_LINK_IS_UP(ro->ro_rt->rt_ifp) || 313 dst->sin_family != AF_INET || 314 dst->sin_addr.s_addr != ip->ip_dst.s_addr)) 315 RO_INVALIDATE_CACHE(ro); 316 ia = NULL; 317 /* 318 * If routing to interface only, short circuit routing lookup. 319 * The use of an all-ones broadcast address implies this; an 320 * interface is specified by the broadcast address of an interface, 321 * or the destination address of a ptp interface. 322 */ 323 if (flags & IP_SENDONES) { 324 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst), 325 M_GETFIB(m)))) == NULL && 326 (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 327 M_GETFIB(m)))) == NULL) { 328 IPSTAT_INC(ips_noroute); 329 error = ENETUNREACH; 330 goto bad; 331 } 332 ip->ip_dst.s_addr = INADDR_BROADCAST; 333 dst->sin_addr = ip->ip_dst; 334 ifp = ia->ia_ifp; 335 mtu = ifp->if_mtu; 336 ip->ip_ttl = 1; 337 isbroadcast = 1; 338 src = IA_SIN(ia)->sin_addr; 339 } else if (flags & IP_ROUTETOIF) { 340 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst), 341 M_GETFIB(m)))) == NULL && 342 (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0, 343 M_GETFIB(m)))) == NULL) { 344 IPSTAT_INC(ips_noroute); 345 error = ENETUNREACH; 346 goto bad; 347 } 348 ifp = ia->ia_ifp; 349 mtu = ifp->if_mtu; 350 ip->ip_ttl = 1; 351 isbroadcast = ifp->if_flags & IFF_BROADCAST ? 352 in_ifaddr_broadcast(dst->sin_addr, ia) : 0; 353 src = IA_SIN(ia)->sin_addr; 354 } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && 355 imo != NULL && imo->imo_multicast_ifp != NULL) { 356 /* 357 * Bypass the normal routing lookup for multicast 358 * packets if the interface is specified. 359 */ 360 ifp = imo->imo_multicast_ifp; 361 mtu = ifp->if_mtu; 362 IFP_TO_IA(ifp, ia, &in_ifa_tracker); 363 isbroadcast = 0; /* fool gcc */ 364 /* Interface may have no addresses. */ 365 if (ia != NULL) 366 src = IA_SIN(ia)->sin_addr; 367 else 368 src.s_addr = INADDR_ANY; 369 } else if (ro != NULL) { 370 if (ro->ro_rt == NULL) { 371 /* 372 * We want to do any cloning requested by the link 373 * layer, as this is probably required in all cases 374 * for correct operation (as it is for ARP). 375 */ 376 #ifdef RADIX_MPATH 377 rtalloc_mpath_fib(ro, 378 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), 379 fibnum); 380 #else 381 in_rtalloc_ign(ro, 0, fibnum); 382 #endif 383 if (ro->ro_rt == NULL || 384 (ro->ro_rt->rt_flags & RTF_UP) == 0 || 385 ro->ro_rt->rt_ifp == NULL || 386 !RT_LINK_IS_UP(ro->ro_rt->rt_ifp)) { 387 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 388 /* 389 * There is no route for this packet, but it is 390 * possible that a matching SPD entry exists. 391 */ 392 no_route_but_check_spd = 1; 393 mtu = 0; /* Silence GCC warning. */ 394 goto sendit; 395 #endif 396 IPSTAT_INC(ips_noroute); 397 error = EHOSTUNREACH; 398 goto bad; 399 } 400 } 401 ia = ifatoia(ro->ro_rt->rt_ifa); 402 ifp = ro->ro_rt->rt_ifp; 403 counter_u64_add(ro->ro_rt->rt_pksent, 1); 404 rt_update_ro_flags(ro); 405 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 406 gw = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 407 if (ro->ro_rt->rt_flags & RTF_HOST) 408 isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST); 409 else if (ifp->if_flags & IFF_BROADCAST) 410 isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia); 411 else 412 isbroadcast = 0; 413 if (ro->ro_rt->rt_flags & RTF_HOST) 414 mtu = ro->ro_rt->rt_mtu; 415 else 416 mtu = ifp->if_mtu; 417 src = IA_SIN(ia)->sin_addr; 418 } else { 419 struct nhop4_extended nh; 420 421 bzero(&nh, sizeof(nh)); 422 if (fib4_lookup_nh_ext(M_GETFIB(m), ip->ip_dst, 0, 0, &nh) != 423 0) { 424 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 425 /* 426 * There is no route for this packet, but it is 427 * possible that a matching SPD entry exists. 428 */ 429 no_route_but_check_spd = 1; 430 mtu = 0; /* Silence GCC warning. */ 431 goto sendit; 432 #endif 433 IPSTAT_INC(ips_noroute); 434 error = EHOSTUNREACH; 435 goto bad; 436 } 437 ifp = nh.nh_ifp; 438 mtu = nh.nh_mtu; 439 /* 440 * We are rewriting here dst to be gw actually, contradicting 441 * comment at the beginning of the function. However, in this 442 * case we are always dealing with on stack dst. 443 * In case if pfil(9) sends us back to beginning of the 444 * function, the dst would be rewritten by ip_output_pfil(). 445 */ 446 MPASS(dst == &sin); 447 dst->sin_addr = nh.nh_addr; 448 ia = nh.nh_ia; 449 src = nh.nh_src; 450 isbroadcast = (((nh.nh_flags & (NHF_HOST | NHF_BROADCAST)) == 451 (NHF_HOST | NHF_BROADCAST)) || 452 ((ifp->if_flags & IFF_BROADCAST) && 453 in_ifaddr_broadcast(dst->sin_addr, ia))); 454 } 455 456 /* Catch a possible divide by zero later. */ 457 KASSERT(mtu > 0, ("%s: mtu %d <= 0, ro=%p (rt_flags=0x%08x) ifp=%p", 458 __func__, mtu, ro, 459 (ro != NULL && ro->ro_rt != NULL) ? ro->ro_rt->rt_flags : 0, ifp)); 460 461 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 462 m->m_flags |= M_MCAST; 463 /* 464 * IP destination address is multicast. Make sure "gw" 465 * still points to the address in "ro". (It may have been 466 * changed to point to a gateway address, above.) 467 */ 468 gw = dst; 469 /* 470 * See if the caller provided any multicast options 471 */ 472 if (imo != NULL) { 473 ip->ip_ttl = imo->imo_multicast_ttl; 474 if (imo->imo_multicast_vif != -1) 475 ip->ip_src.s_addr = 476 ip_mcast_src ? 477 ip_mcast_src(imo->imo_multicast_vif) : 478 INADDR_ANY; 479 } else 480 ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; 481 /* 482 * Confirm that the outgoing interface supports multicast. 483 */ 484 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { 485 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 486 IPSTAT_INC(ips_noroute); 487 error = ENETUNREACH; 488 goto bad; 489 } 490 } 491 /* 492 * If source address not specified yet, use address 493 * of outgoing interface. 494 */ 495 if (ip->ip_src.s_addr == INADDR_ANY) 496 ip->ip_src = src; 497 498 if ((imo == NULL && in_mcast_loop) || 499 (imo && imo->imo_multicast_loop)) { 500 /* 501 * Loop back multicast datagram if not expressly 502 * forbidden to do so, even if we are not a member 503 * of the group; ip_input() will filter it later, 504 * thus deferring a hash lookup and mutex acquisition 505 * at the expense of a cheap copy using m_copym(). 506 */ 507 ip_mloopback(ifp, m, hlen); 508 } else { 509 /* 510 * If we are acting as a multicast router, perform 511 * multicast forwarding as if the packet had just 512 * arrived on the interface to which we are about 513 * to send. The multicast forwarding function 514 * recursively calls this function, using the 515 * IP_FORWARDING flag to prevent infinite recursion. 516 * 517 * Multicasts that are looped back by ip_mloopback(), 518 * above, will be forwarded by the ip_input() routine, 519 * if necessary. 520 */ 521 if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) { 522 /* 523 * If rsvp daemon is not running, do not 524 * set ip_moptions. This ensures that the packet 525 * is multicast and not just sent down one link 526 * as prescribed by rsvpd. 527 */ 528 if (!V_rsvp_on) 529 imo = NULL; 530 if (ip_mforward && 531 ip_mforward(ip, ifp, m, imo) != 0) { 532 m_freem(m); 533 goto done; 534 } 535 } 536 } 537 538 /* 539 * Multicasts with a time-to-live of zero may be looped- 540 * back, above, but must not be transmitted on a network. 541 * Also, multicasts addressed to the loopback interface 542 * are not sent -- the above call to ip_mloopback() will 543 * loop back a copy. ip_input() will drop the copy if 544 * this host does not belong to the destination group on 545 * the loopback interface. 546 */ 547 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { 548 m_freem(m); 549 goto done; 550 } 551 552 goto sendit; 553 } 554 555 /* 556 * If the source address is not specified yet, use the address 557 * of the outoing interface. 558 */ 559 if (ip->ip_src.s_addr == INADDR_ANY) 560 ip->ip_src = src; 561 562 /* 563 * Look for broadcast address and 564 * verify user is allowed to send 565 * such a packet. 566 */ 567 if (isbroadcast) { 568 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 569 error = EADDRNOTAVAIL; 570 goto bad; 571 } 572 if ((flags & IP_ALLOWBROADCAST) == 0) { 573 error = EACCES; 574 goto bad; 575 } 576 /* don't allow broadcast messages to be fragmented */ 577 if (ip_len > mtu) { 578 error = EMSGSIZE; 579 goto bad; 580 } 581 m->m_flags |= M_BCAST; 582 } else { 583 m->m_flags &= ~M_BCAST; 584 } 585 586 sendit: 587 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 588 if (IPSEC_ENABLED(ipv4)) { 589 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) { 590 if (error == EINPROGRESS) 591 error = 0; 592 goto done; 593 } 594 } 595 /* 596 * Check if there was a route for this packet; return error if not. 597 */ 598 if (no_route_but_check_spd) { 599 IPSTAT_INC(ips_noroute); 600 error = EHOSTUNREACH; 601 goto bad; 602 } 603 /* Update variables that are affected by ipsec4_output(). */ 604 ip = mtod(m, struct ip *); 605 hlen = ip->ip_hl << 2; 606 #endif /* IPSEC */ 607 608 /* Jump over all PFIL processing if hooks are not active. */ 609 if (PFIL_HOOKED_OUT(V_inet_pfil_head)) { 610 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) { 611 case 1: /* Finished */ 612 goto done; 613 614 case 0: /* Continue normally */ 615 ip = mtod(m, struct ip *); 616 break; 617 618 case -1: /* Need to try again */ 619 /* Reset everything for a new round */ 620 if (ro != NULL) { 621 RO_RTFREE(ro); 622 ro->ro_prepend = NULL; 623 } 624 gw = dst; 625 ip = mtod(m, struct ip *); 626 goto again; 627 628 } 629 } 630 631 /* IN_LOOPBACK must not appear on the wire - RFC1122. */ 632 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 633 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 634 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 635 IPSTAT_INC(ips_badaddr); 636 error = EADDRNOTAVAIL; 637 goto bad; 638 } 639 } 640 641 m->m_pkthdr.csum_flags |= CSUM_IP; 642 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) { 643 in_delayed_cksum(m); 644 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 645 } 646 #ifdef SCTP 647 if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) { 648 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2)); 649 m->m_pkthdr.csum_flags &= ~CSUM_SCTP; 650 } 651 #endif 652 653 /* 654 * If small enough for interface, or the interface will take 655 * care of the fragmentation for us, we can just send directly. 656 */ 657 if (ip_len <= mtu || 658 (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) { 659 ip->ip_sum = 0; 660 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) { 661 ip->ip_sum = in_cksum(m, hlen); 662 m->m_pkthdr.csum_flags &= ~CSUM_IP; 663 } 664 665 /* 666 * Record statistics for this interface address. 667 * With CSUM_TSO the byte/packet count will be slightly 668 * incorrect because we count the IP+TCP headers only 669 * once instead of for every generated packet. 670 */ 671 if (!(flags & IP_FORWARDING) && ia) { 672 if (m->m_pkthdr.csum_flags & CSUM_TSO) 673 counter_u64_add(ia->ia_ifa.ifa_opackets, 674 m->m_pkthdr.len / m->m_pkthdr.tso_segsz); 675 else 676 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 677 678 counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len); 679 } 680 #ifdef MBUF_STRESS_TEST 681 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size) 682 m = m_fragment(m, M_NOWAIT, mbuf_frag_size); 683 #endif 684 /* 685 * Reset layer specific mbuf flags 686 * to avoid confusing lower layers. 687 */ 688 m_clrprotoflags(m); 689 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL); 690 #ifdef RATELIMIT 691 if (inp != NULL) { 692 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) 693 in_pcboutput_txrtlmt(inp, ifp, m); 694 /* stamp send tag on mbuf */ 695 m->m_pkthdr.snd_tag = inp->inp_snd_tag; 696 } else { 697 m->m_pkthdr.snd_tag = NULL; 698 } 699 #endif 700 error = (*ifp->if_output)(ifp, m, 701 (const struct sockaddr *)gw, ro); 702 #ifdef RATELIMIT 703 /* check for route change */ 704 if (error == EAGAIN) 705 in_pcboutput_eagain(inp); 706 #endif 707 goto done; 708 } 709 710 /* Balk when DF bit is set or the interface didn't support TSO. */ 711 if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) { 712 error = EMSGSIZE; 713 IPSTAT_INC(ips_cantfrag); 714 goto bad; 715 } 716 717 /* 718 * Too large for interface; fragment if possible. If successful, 719 * on return, m will point to a list of packets to be sent. 720 */ 721 error = ip_fragment(ip, &m, mtu, ifp->if_hwassist); 722 if (error) 723 goto bad; 724 for (; m; m = m0) { 725 m0 = m->m_nextpkt; 726 m->m_nextpkt = 0; 727 if (error == 0) { 728 /* Record statistics for this interface address. */ 729 if (ia != NULL) { 730 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 731 counter_u64_add(ia->ia_ifa.ifa_obytes, 732 m->m_pkthdr.len); 733 } 734 /* 735 * Reset layer specific mbuf flags 736 * to avoid confusing upper layers. 737 */ 738 m_clrprotoflags(m); 739 740 IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp, 741 mtod(m, struct ip *), NULL); 742 #ifdef RATELIMIT 743 if (inp != NULL) { 744 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) 745 in_pcboutput_txrtlmt(inp, ifp, m); 746 /* stamp send tag on mbuf */ 747 m->m_pkthdr.snd_tag = inp->inp_snd_tag; 748 } else { 749 m->m_pkthdr.snd_tag = NULL; 750 } 751 #endif 752 error = (*ifp->if_output)(ifp, m, 753 (const struct sockaddr *)gw, ro); 754 #ifdef RATELIMIT 755 /* check for route change */ 756 if (error == EAGAIN) 757 in_pcboutput_eagain(inp); 758 #endif 759 } else 760 m_freem(m); 761 } 762 763 if (error == 0) 764 IPSTAT_INC(ips_fragmented); 765 766 done: 767 NET_EPOCH_EXIT(et); 768 return (error); 769 bad: 770 m_freem(m); 771 goto done; 772 } 773 774 /* 775 * Create a chain of fragments which fit the given mtu. m_frag points to the 776 * mbuf to be fragmented; on return it points to the chain with the fragments. 777 * Return 0 if no error. If error, m_frag may contain a partially built 778 * chain of fragments that should be freed by the caller. 779 * 780 * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist) 781 */ 782 int 783 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu, 784 u_long if_hwassist_flags) 785 { 786 int error = 0; 787 int hlen = ip->ip_hl << 2; 788 int len = (mtu - hlen) & ~7; /* size of payload in each fragment */ 789 int off; 790 struct mbuf *m0 = *m_frag; /* the original packet */ 791 int firstlen; 792 struct mbuf **mnext; 793 int nfrags; 794 uint16_t ip_len, ip_off; 795 796 ip_len = ntohs(ip->ip_len); 797 ip_off = ntohs(ip->ip_off); 798 799 if (ip_off & IP_DF) { /* Fragmentation not allowed */ 800 IPSTAT_INC(ips_cantfrag); 801 return EMSGSIZE; 802 } 803 804 /* 805 * Must be able to put at least 8 bytes per fragment. 806 */ 807 if (len < 8) 808 return EMSGSIZE; 809 810 /* 811 * If the interface will not calculate checksums on 812 * fragmented packets, then do it here. 813 */ 814 if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 815 in_delayed_cksum(m0); 816 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 817 } 818 #ifdef SCTP 819 if (m0->m_pkthdr.csum_flags & CSUM_SCTP) { 820 sctp_delayed_cksum(m0, hlen); 821 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP; 822 } 823 #endif 824 if (len > PAGE_SIZE) { 825 /* 826 * Fragment large datagrams such that each segment 827 * contains a multiple of PAGE_SIZE amount of data, 828 * plus headers. This enables a receiver to perform 829 * page-flipping zero-copy optimizations. 830 * 831 * XXX When does this help given that sender and receiver 832 * could have different page sizes, and also mtu could 833 * be less than the receiver's page size ? 834 */ 835 int newlen; 836 837 off = MIN(mtu, m0->m_pkthdr.len); 838 839 /* 840 * firstlen (off - hlen) must be aligned on an 841 * 8-byte boundary 842 */ 843 if (off < hlen) 844 goto smart_frag_failure; 845 off = ((off - hlen) & ~7) + hlen; 846 newlen = (~PAGE_MASK) & mtu; 847 if ((newlen + sizeof (struct ip)) > mtu) { 848 /* we failed, go back the default */ 849 smart_frag_failure: 850 newlen = len; 851 off = hlen + len; 852 } 853 len = newlen; 854 855 } else { 856 off = hlen + len; 857 } 858 859 firstlen = off - hlen; 860 mnext = &m0->m_nextpkt; /* pointer to next packet */ 861 862 /* 863 * Loop through length of segment after first fragment, 864 * make new header and copy data of each part and link onto chain. 865 * Here, m0 is the original packet, m is the fragment being created. 866 * The fragments are linked off the m_nextpkt of the original 867 * packet, which after processing serves as the first fragment. 868 */ 869 for (nfrags = 1; off < ip_len; off += len, nfrags++) { 870 struct ip *mhip; /* ip header on the fragment */ 871 struct mbuf *m; 872 int mhlen = sizeof (struct ip); 873 874 m = m_gethdr(M_NOWAIT, MT_DATA); 875 if (m == NULL) { 876 error = ENOBUFS; 877 IPSTAT_INC(ips_odropped); 878 goto done; 879 } 880 /* 881 * Make sure the complete packet header gets copied 882 * from the originating mbuf to the newly created 883 * mbuf. This also ensures that existing firewall 884 * classification(s), VLAN tags and so on get copied 885 * to the resulting fragmented packet(s): 886 */ 887 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) { 888 m_free(m); 889 error = ENOBUFS; 890 IPSTAT_INC(ips_odropped); 891 goto done; 892 } 893 /* 894 * In the first mbuf, leave room for the link header, then 895 * copy the original IP header including options. The payload 896 * goes into an additional mbuf chain returned by m_copym(). 897 */ 898 m->m_data += max_linkhdr; 899 mhip = mtod(m, struct ip *); 900 *mhip = *ip; 901 if (hlen > sizeof (struct ip)) { 902 mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 903 mhip->ip_v = IPVERSION; 904 mhip->ip_hl = mhlen >> 2; 905 } 906 m->m_len = mhlen; 907 /* XXX do we need to add ip_off below ? */ 908 mhip->ip_off = ((off - hlen) >> 3) + ip_off; 909 if (off + len >= ip_len) 910 len = ip_len - off; 911 else 912 mhip->ip_off |= IP_MF; 913 mhip->ip_len = htons((u_short)(len + mhlen)); 914 m->m_next = m_copym(m0, off, len, M_NOWAIT); 915 if (m->m_next == NULL) { /* copy failed */ 916 m_free(m); 917 error = ENOBUFS; /* ??? */ 918 IPSTAT_INC(ips_odropped); 919 goto done; 920 } 921 m->m_pkthdr.len = mhlen + len; 922 #ifdef MAC 923 mac_netinet_fragment(m0, m); 924 #endif 925 mhip->ip_off = htons(mhip->ip_off); 926 mhip->ip_sum = 0; 927 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 928 mhip->ip_sum = in_cksum(m, mhlen); 929 m->m_pkthdr.csum_flags &= ~CSUM_IP; 930 } 931 *mnext = m; 932 mnext = &m->m_nextpkt; 933 } 934 IPSTAT_ADD(ips_ofragments, nfrags); 935 936 /* 937 * Update first fragment by trimming what's been copied out 938 * and updating header. 939 */ 940 m_adj(m0, hlen + firstlen - ip_len); 941 m0->m_pkthdr.len = hlen + firstlen; 942 ip->ip_len = htons((u_short)m0->m_pkthdr.len); 943 ip->ip_off = htons(ip_off | IP_MF); 944 ip->ip_sum = 0; 945 if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) { 946 ip->ip_sum = in_cksum(m0, hlen); 947 m0->m_pkthdr.csum_flags &= ~CSUM_IP; 948 } 949 950 done: 951 *m_frag = m0; 952 return error; 953 } 954 955 void 956 in_delayed_cksum(struct mbuf *m) 957 { 958 struct ip *ip; 959 struct udphdr *uh; 960 uint16_t cklen, csum, offset; 961 962 ip = mtod(m, struct ip *); 963 offset = ip->ip_hl << 2 ; 964 965 if (m->m_pkthdr.csum_flags & CSUM_UDP) { 966 /* if udp header is not in the first mbuf copy udplen */ 967 if (offset + sizeof(struct udphdr) > m->m_len) { 968 m_copydata(m, offset + offsetof(struct udphdr, 969 uh_ulen), sizeof(cklen), (caddr_t)&cklen); 970 cklen = ntohs(cklen); 971 } else { 972 uh = (struct udphdr *)mtodo(m, offset); 973 cklen = ntohs(uh->uh_ulen); 974 } 975 csum = in_cksum_skip(m, cklen + offset, offset); 976 if (csum == 0) 977 csum = 0xffff; 978 } else { 979 cklen = ntohs(ip->ip_len); 980 csum = in_cksum_skip(m, cklen, offset); 981 } 982 offset += m->m_pkthdr.csum_data; /* checksum offset */ 983 984 if (offset + sizeof(csum) > m->m_len) 985 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum); 986 else 987 *(u_short *)mtodo(m, offset) = csum; 988 } 989 990 /* 991 * IP socket option processing. 992 */ 993 int 994 ip_ctloutput(struct socket *so, struct sockopt *sopt) 995 { 996 struct inpcb *inp = sotoinpcb(so); 997 int error, optval; 998 #ifdef RSS 999 uint32_t rss_bucket; 1000 int retval; 1001 #endif 1002 1003 error = optval = 0; 1004 if (sopt->sopt_level != IPPROTO_IP) { 1005 error = EINVAL; 1006 1007 if (sopt->sopt_level == SOL_SOCKET && 1008 sopt->sopt_dir == SOPT_SET) { 1009 switch (sopt->sopt_name) { 1010 case SO_REUSEADDR: 1011 INP_WLOCK(inp); 1012 if ((so->so_options & SO_REUSEADDR) != 0) 1013 inp->inp_flags2 |= INP_REUSEADDR; 1014 else 1015 inp->inp_flags2 &= ~INP_REUSEADDR; 1016 INP_WUNLOCK(inp); 1017 error = 0; 1018 break; 1019 case SO_REUSEPORT: 1020 INP_WLOCK(inp); 1021 if ((so->so_options & SO_REUSEPORT) != 0) 1022 inp->inp_flags2 |= INP_REUSEPORT; 1023 else 1024 inp->inp_flags2 &= ~INP_REUSEPORT; 1025 INP_WUNLOCK(inp); 1026 error = 0; 1027 break; 1028 case SO_REUSEPORT_LB: 1029 INP_WLOCK(inp); 1030 if ((so->so_options & SO_REUSEPORT_LB) != 0) 1031 inp->inp_flags2 |= INP_REUSEPORT_LB; 1032 else 1033 inp->inp_flags2 &= ~INP_REUSEPORT_LB; 1034 INP_WUNLOCK(inp); 1035 error = 0; 1036 break; 1037 case SO_SETFIB: 1038 INP_WLOCK(inp); 1039 inp->inp_inc.inc_fibnum = so->so_fibnum; 1040 INP_WUNLOCK(inp); 1041 error = 0; 1042 break; 1043 case SO_MAX_PACING_RATE: 1044 #ifdef RATELIMIT 1045 INP_WLOCK(inp); 1046 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 1047 INP_WUNLOCK(inp); 1048 error = 0; 1049 #else 1050 error = EOPNOTSUPP; 1051 #endif 1052 break; 1053 default: 1054 break; 1055 } 1056 } 1057 return (error); 1058 } 1059 1060 switch (sopt->sopt_dir) { 1061 case SOPT_SET: 1062 switch (sopt->sopt_name) { 1063 case IP_OPTIONS: 1064 #ifdef notyet 1065 case IP_RETOPTS: 1066 #endif 1067 { 1068 struct mbuf *m; 1069 if (sopt->sopt_valsize > MLEN) { 1070 error = EMSGSIZE; 1071 break; 1072 } 1073 m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA); 1074 if (m == NULL) { 1075 error = ENOBUFS; 1076 break; 1077 } 1078 m->m_len = sopt->sopt_valsize; 1079 error = sooptcopyin(sopt, mtod(m, char *), m->m_len, 1080 m->m_len); 1081 if (error) { 1082 m_free(m); 1083 break; 1084 } 1085 INP_WLOCK(inp); 1086 error = ip_pcbopts(inp, sopt->sopt_name, m); 1087 INP_WUNLOCK(inp); 1088 return (error); 1089 } 1090 1091 case IP_BINDANY: 1092 if (sopt->sopt_td != NULL) { 1093 error = priv_check(sopt->sopt_td, 1094 PRIV_NETINET_BINDANY); 1095 if (error) 1096 break; 1097 } 1098 /* FALLTHROUGH */ 1099 case IP_BINDMULTI: 1100 #ifdef RSS 1101 case IP_RSS_LISTEN_BUCKET: 1102 #endif 1103 case IP_TOS: 1104 case IP_TTL: 1105 case IP_MINTTL: 1106 case IP_RECVOPTS: 1107 case IP_RECVRETOPTS: 1108 case IP_ORIGDSTADDR: 1109 case IP_RECVDSTADDR: 1110 case IP_RECVTTL: 1111 case IP_RECVIF: 1112 case IP_ONESBCAST: 1113 case IP_DONTFRAG: 1114 case IP_RECVTOS: 1115 case IP_RECVFLOWID: 1116 #ifdef RSS 1117 case IP_RECVRSSBUCKETID: 1118 #endif 1119 error = sooptcopyin(sopt, &optval, sizeof optval, 1120 sizeof optval); 1121 if (error) 1122 break; 1123 1124 switch (sopt->sopt_name) { 1125 case IP_TOS: 1126 inp->inp_ip_tos = optval; 1127 break; 1128 1129 case IP_TTL: 1130 inp->inp_ip_ttl = optval; 1131 break; 1132 1133 case IP_MINTTL: 1134 if (optval >= 0 && optval <= MAXTTL) 1135 inp->inp_ip_minttl = optval; 1136 else 1137 error = EINVAL; 1138 break; 1139 1140 #define OPTSET(bit) do { \ 1141 INP_WLOCK(inp); \ 1142 if (optval) \ 1143 inp->inp_flags |= bit; \ 1144 else \ 1145 inp->inp_flags &= ~bit; \ 1146 INP_WUNLOCK(inp); \ 1147 } while (0) 1148 1149 #define OPTSET2(bit, val) do { \ 1150 INP_WLOCK(inp); \ 1151 if (val) \ 1152 inp->inp_flags2 |= bit; \ 1153 else \ 1154 inp->inp_flags2 &= ~bit; \ 1155 INP_WUNLOCK(inp); \ 1156 } while (0) 1157 1158 case IP_RECVOPTS: 1159 OPTSET(INP_RECVOPTS); 1160 break; 1161 1162 case IP_RECVRETOPTS: 1163 OPTSET(INP_RECVRETOPTS); 1164 break; 1165 1166 case IP_RECVDSTADDR: 1167 OPTSET(INP_RECVDSTADDR); 1168 break; 1169 1170 case IP_ORIGDSTADDR: 1171 OPTSET2(INP_ORIGDSTADDR, optval); 1172 break; 1173 1174 case IP_RECVTTL: 1175 OPTSET(INP_RECVTTL); 1176 break; 1177 1178 case IP_RECVIF: 1179 OPTSET(INP_RECVIF); 1180 break; 1181 1182 case IP_ONESBCAST: 1183 OPTSET(INP_ONESBCAST); 1184 break; 1185 case IP_DONTFRAG: 1186 OPTSET(INP_DONTFRAG); 1187 break; 1188 case IP_BINDANY: 1189 OPTSET(INP_BINDANY); 1190 break; 1191 case IP_RECVTOS: 1192 OPTSET(INP_RECVTOS); 1193 break; 1194 case IP_BINDMULTI: 1195 OPTSET2(INP_BINDMULTI, optval); 1196 break; 1197 case IP_RECVFLOWID: 1198 OPTSET2(INP_RECVFLOWID, optval); 1199 break; 1200 #ifdef RSS 1201 case IP_RSS_LISTEN_BUCKET: 1202 if ((optval >= 0) && 1203 (optval < rss_getnumbuckets())) { 1204 inp->inp_rss_listen_bucket = optval; 1205 OPTSET2(INP_RSS_BUCKET_SET, 1); 1206 } else { 1207 error = EINVAL; 1208 } 1209 break; 1210 case IP_RECVRSSBUCKETID: 1211 OPTSET2(INP_RECVRSSBUCKETID, optval); 1212 break; 1213 #endif 1214 } 1215 break; 1216 #undef OPTSET 1217 #undef OPTSET2 1218 1219 /* 1220 * Multicast socket options are processed by the in_mcast 1221 * module. 1222 */ 1223 case IP_MULTICAST_IF: 1224 case IP_MULTICAST_VIF: 1225 case IP_MULTICAST_TTL: 1226 case IP_MULTICAST_LOOP: 1227 case IP_ADD_MEMBERSHIP: 1228 case IP_DROP_MEMBERSHIP: 1229 case IP_ADD_SOURCE_MEMBERSHIP: 1230 case IP_DROP_SOURCE_MEMBERSHIP: 1231 case IP_BLOCK_SOURCE: 1232 case IP_UNBLOCK_SOURCE: 1233 case IP_MSFILTER: 1234 case MCAST_JOIN_GROUP: 1235 case MCAST_LEAVE_GROUP: 1236 case MCAST_JOIN_SOURCE_GROUP: 1237 case MCAST_LEAVE_SOURCE_GROUP: 1238 case MCAST_BLOCK_SOURCE: 1239 case MCAST_UNBLOCK_SOURCE: 1240 error = inp_setmoptions(inp, sopt); 1241 break; 1242 1243 case IP_PORTRANGE: 1244 error = sooptcopyin(sopt, &optval, sizeof optval, 1245 sizeof optval); 1246 if (error) 1247 break; 1248 1249 INP_WLOCK(inp); 1250 switch (optval) { 1251 case IP_PORTRANGE_DEFAULT: 1252 inp->inp_flags &= ~(INP_LOWPORT); 1253 inp->inp_flags &= ~(INP_HIGHPORT); 1254 break; 1255 1256 case IP_PORTRANGE_HIGH: 1257 inp->inp_flags &= ~(INP_LOWPORT); 1258 inp->inp_flags |= INP_HIGHPORT; 1259 break; 1260 1261 case IP_PORTRANGE_LOW: 1262 inp->inp_flags &= ~(INP_HIGHPORT); 1263 inp->inp_flags |= INP_LOWPORT; 1264 break; 1265 1266 default: 1267 error = EINVAL; 1268 break; 1269 } 1270 INP_WUNLOCK(inp); 1271 break; 1272 1273 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1274 case IP_IPSEC_POLICY: 1275 if (IPSEC_ENABLED(ipv4)) { 1276 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1277 break; 1278 } 1279 /* FALLTHROUGH */ 1280 #endif /* IPSEC */ 1281 1282 default: 1283 error = ENOPROTOOPT; 1284 break; 1285 } 1286 break; 1287 1288 case SOPT_GET: 1289 switch (sopt->sopt_name) { 1290 case IP_OPTIONS: 1291 case IP_RETOPTS: 1292 INP_RLOCK(inp); 1293 if (inp->inp_options) { 1294 struct mbuf *options; 1295 1296 options = m_copym(inp->inp_options, 0, 1297 M_COPYALL, M_NOWAIT); 1298 INP_RUNLOCK(inp); 1299 if (options != NULL) { 1300 error = sooptcopyout(sopt, 1301 mtod(options, char *), 1302 options->m_len); 1303 m_freem(options); 1304 } else 1305 error = ENOMEM; 1306 } else { 1307 INP_RUNLOCK(inp); 1308 sopt->sopt_valsize = 0; 1309 } 1310 break; 1311 1312 case IP_TOS: 1313 case IP_TTL: 1314 case IP_MINTTL: 1315 case IP_RECVOPTS: 1316 case IP_RECVRETOPTS: 1317 case IP_ORIGDSTADDR: 1318 case IP_RECVDSTADDR: 1319 case IP_RECVTTL: 1320 case IP_RECVIF: 1321 case IP_PORTRANGE: 1322 case IP_ONESBCAST: 1323 case IP_DONTFRAG: 1324 case IP_BINDANY: 1325 case IP_RECVTOS: 1326 case IP_BINDMULTI: 1327 case IP_FLOWID: 1328 case IP_FLOWTYPE: 1329 case IP_RECVFLOWID: 1330 #ifdef RSS 1331 case IP_RSSBUCKETID: 1332 case IP_RECVRSSBUCKETID: 1333 #endif 1334 switch (sopt->sopt_name) { 1335 1336 case IP_TOS: 1337 optval = inp->inp_ip_tos; 1338 break; 1339 1340 case IP_TTL: 1341 optval = inp->inp_ip_ttl; 1342 break; 1343 1344 case IP_MINTTL: 1345 optval = inp->inp_ip_minttl; 1346 break; 1347 1348 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1349 #define OPTBIT2(bit) (inp->inp_flags2 & bit ? 1 : 0) 1350 1351 case IP_RECVOPTS: 1352 optval = OPTBIT(INP_RECVOPTS); 1353 break; 1354 1355 case IP_RECVRETOPTS: 1356 optval = OPTBIT(INP_RECVRETOPTS); 1357 break; 1358 1359 case IP_RECVDSTADDR: 1360 optval = OPTBIT(INP_RECVDSTADDR); 1361 break; 1362 1363 case IP_ORIGDSTADDR: 1364 optval = OPTBIT2(INP_ORIGDSTADDR); 1365 break; 1366 1367 case IP_RECVTTL: 1368 optval = OPTBIT(INP_RECVTTL); 1369 break; 1370 1371 case IP_RECVIF: 1372 optval = OPTBIT(INP_RECVIF); 1373 break; 1374 1375 case IP_PORTRANGE: 1376 if (inp->inp_flags & INP_HIGHPORT) 1377 optval = IP_PORTRANGE_HIGH; 1378 else if (inp->inp_flags & INP_LOWPORT) 1379 optval = IP_PORTRANGE_LOW; 1380 else 1381 optval = 0; 1382 break; 1383 1384 case IP_ONESBCAST: 1385 optval = OPTBIT(INP_ONESBCAST); 1386 break; 1387 case IP_DONTFRAG: 1388 optval = OPTBIT(INP_DONTFRAG); 1389 break; 1390 case IP_BINDANY: 1391 optval = OPTBIT(INP_BINDANY); 1392 break; 1393 case IP_RECVTOS: 1394 optval = OPTBIT(INP_RECVTOS); 1395 break; 1396 case IP_FLOWID: 1397 optval = inp->inp_flowid; 1398 break; 1399 case IP_FLOWTYPE: 1400 optval = inp->inp_flowtype; 1401 break; 1402 case IP_RECVFLOWID: 1403 optval = OPTBIT2(INP_RECVFLOWID); 1404 break; 1405 #ifdef RSS 1406 case IP_RSSBUCKETID: 1407 retval = rss_hash2bucket(inp->inp_flowid, 1408 inp->inp_flowtype, 1409 &rss_bucket); 1410 if (retval == 0) 1411 optval = rss_bucket; 1412 else 1413 error = EINVAL; 1414 break; 1415 case IP_RECVRSSBUCKETID: 1416 optval = OPTBIT2(INP_RECVRSSBUCKETID); 1417 break; 1418 #endif 1419 case IP_BINDMULTI: 1420 optval = OPTBIT2(INP_BINDMULTI); 1421 break; 1422 } 1423 error = sooptcopyout(sopt, &optval, sizeof optval); 1424 break; 1425 1426 /* 1427 * Multicast socket options are processed by the in_mcast 1428 * module. 1429 */ 1430 case IP_MULTICAST_IF: 1431 case IP_MULTICAST_VIF: 1432 case IP_MULTICAST_TTL: 1433 case IP_MULTICAST_LOOP: 1434 case IP_MSFILTER: 1435 error = inp_getmoptions(inp, sopt); 1436 break; 1437 1438 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1439 case IP_IPSEC_POLICY: 1440 if (IPSEC_ENABLED(ipv4)) { 1441 error = IPSEC_PCBCTL(ipv4, inp, sopt); 1442 break; 1443 } 1444 /* FALLTHROUGH */ 1445 #endif /* IPSEC */ 1446 1447 default: 1448 error = ENOPROTOOPT; 1449 break; 1450 } 1451 break; 1452 } 1453 return (error); 1454 } 1455 1456 /* 1457 * Routine called from ip_output() to loop back a copy of an IP multicast 1458 * packet to the input queue of a specified interface. Note that this 1459 * calls the output routine of the loopback "driver", but with an interface 1460 * pointer that might NOT be a loopback interface -- evil, but easier than 1461 * replicating that code here. 1462 */ 1463 static void 1464 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen) 1465 { 1466 struct ip *ip; 1467 struct mbuf *copym; 1468 1469 /* 1470 * Make a deep copy of the packet because we're going to 1471 * modify the pack in order to generate checksums. 1472 */ 1473 copym = m_dup(m, M_NOWAIT); 1474 if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen)) 1475 copym = m_pullup(copym, hlen); 1476 if (copym != NULL) { 1477 /* If needed, compute the checksum and mark it as valid. */ 1478 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 1479 in_delayed_cksum(copym); 1480 copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 1481 copym->m_pkthdr.csum_flags |= 1482 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1483 copym->m_pkthdr.csum_data = 0xffff; 1484 } 1485 /* 1486 * We don't bother to fragment if the IP length is greater 1487 * than the interface's MTU. Can this possibly matter? 1488 */ 1489 ip = mtod(copym, struct ip *); 1490 ip->ip_sum = 0; 1491 ip->ip_sum = in_cksum(copym, hlen); 1492 if_simloop(ifp, copym, AF_INET, 0); 1493 } 1494 } 1495