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sys/net/if_ethersubr.c
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1 /*- 2 * Copyright (c) 1982, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 30 * $FreeBSD$ 31 */ 32 33 #include "opt_atalk.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 #include "opt_ipx.h" 37 #include "opt_bdg.h" 38 #include "opt_mac.h" 39 #include "opt_netgraph.h" 40 #include "opt_carp.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/mac.h> 46 #include <sys/malloc.h> 47 #include <sys/module.h> 48 #include <sys/mbuf.h> 49 #include <sys/random.h> 50 #include <sys/socket.h> 51 #include <sys/sockio.h> 52 #include <sys/sysctl.h> 53 54 #include <net/if.h> 55 #include <net/if_arp.h> 56 #include <net/netisr.h> 57 #include <net/route.h> 58 #include <net/if_llc.h> 59 #include <net/if_dl.h> 60 #include <net/if_types.h> 61 #include <net/bpf.h> 62 #include <net/ethernet.h> 63 #include <net/bridge.h> 64 #include <net/if_bridgevar.h> 65 #include <net/if_vlan_var.h> 66 67 #if defined(INET) || defined(INET6) 68 #include <netinet/in.h> 69 #include <netinet/in_var.h> 70 #include <netinet/if_ether.h> 71 #include <netinet/ip_fw.h> 72 #include <netinet/ip_dummynet.h> 73 #endif 74 #ifdef INET6 75 #include <netinet6/nd6.h> 76 #endif 77 78 #ifdef DEV_CARP 79 #include <netinet/ip_carp.h> 80 #endif 81 82 #ifdef IPX 83 #include <netipx/ipx.h> 84 #include <netipx/ipx_if.h> 85 #endif 86 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m); 87 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, 88 struct sockaddr *dst, short *tp, int *hlen); 89 90 #ifdef NETATALK 91 #include <netatalk/at.h> 92 #include <netatalk/at_var.h> 93 #include <netatalk/at_extern.h> 94 95 #define llc_snap_org_code llc_un.type_snap.org_code 96 #define llc_snap_ether_type llc_un.type_snap.ether_type 97 98 extern u_char at_org_code[3]; 99 extern u_char aarp_org_code[3]; 100 #endif /* NETATALK */ 101 102 /* netgraph node hooks for ng_ether(4) */ 103 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 104 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 105 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 106 void (*ng_ether_attach_p)(struct ifnet *ifp); 107 void (*ng_ether_detach_p)(struct ifnet *ifp); 108 109 void (*vlan_input_p)(struct ifnet *, struct mbuf *); 110 111 /* bridge support */ 112 int do_bridge; 113 bridge_in_t *bridge_in_ptr; 114 bdg_forward_t *bdg_forward_ptr; 115 bdgtakeifaces_t *bdgtakeifaces_ptr; 116 struct bdg_softc *ifp2sc; 117 118 /* if_bridge(4) support */ 119 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *); 120 int (*bridge_output_p)(struct ifnet *, struct mbuf *, 121 struct sockaddr *, struct rtentry *); 122 void (*bridge_dn_p)(struct mbuf *, struct ifnet *); 123 124 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 125 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 126 127 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 128 struct sockaddr *); 129 130 #define senderr(e) do { error = (e); goto bad;} while (0) 131 132 #if defined(INET) || defined(INET6) 133 int 134 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 135 struct ip_fw **rule, int shared); 136 static int ether_ipfw; 137 #endif 138 139 /* 140 * Ethernet output routine. 141 * Encapsulate a packet of type family for the local net. 142 * Use trailer local net encapsulation if enough data in first 143 * packet leaves a multiple of 512 bytes of data in remainder. 144 * Assumes that ifp is actually pointer to arpcom structure. 145 */ 146 int 147 ether_output(struct ifnet *ifp, struct mbuf *m, 148 struct sockaddr *dst, struct rtentry *rt0) 149 { 150 short type; 151 int error, hdrcmplt = 0; 152 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN]; 153 struct ether_header *eh; 154 int loop_copy = 1; 155 int hlen; /* link layer header length */ 156 157 #ifdef MAC 158 error = mac_check_ifnet_transmit(ifp, m); 159 if (error) 160 senderr(error); 161 #endif 162 163 if (ifp->if_flags & IFF_MONITOR) 164 senderr(ENETDOWN); 165 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 166 senderr(ENETDOWN); 167 168 hlen = ETHER_HDR_LEN; 169 switch (dst->sa_family) { 170 #ifdef INET 171 case AF_INET: 172 error = arpresolve(ifp, rt0, m, dst, edst); 173 if (error) 174 return (error == EWOULDBLOCK ? 0 : error); 175 type = htons(ETHERTYPE_IP); 176 break; 177 case AF_ARP: 178 { 179 struct arphdr *ah; 180 ah = mtod(m, struct arphdr *); 181 ah->ar_hrd = htons(ARPHRD_ETHER); 182 183 loop_copy = 0; /* if this is for us, don't do it */ 184 185 switch(ntohs(ah->ar_op)) { 186 case ARPOP_REVREQUEST: 187 case ARPOP_REVREPLY: 188 type = htons(ETHERTYPE_REVARP); 189 break; 190 case ARPOP_REQUEST: 191 case ARPOP_REPLY: 192 default: 193 type = htons(ETHERTYPE_ARP); 194 break; 195 } 196 197 if (m->m_flags & M_BCAST) 198 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN); 199 else 200 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN); 201 202 } 203 break; 204 #endif 205 #ifdef INET6 206 case AF_INET6: 207 error = nd6_storelladdr(ifp, rt0, m, dst, (u_char *)edst); 208 if (error) 209 return error; 210 type = htons(ETHERTYPE_IPV6); 211 break; 212 #endif 213 #ifdef IPX 214 case AF_IPX: 215 if (ef_outputp) { 216 error = ef_outputp(ifp, &m, dst, &type, &hlen); 217 if (error) 218 goto bad; 219 } else 220 type = htons(ETHERTYPE_IPX); 221 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 222 (caddr_t)edst, sizeof (edst)); 223 break; 224 #endif 225 #ifdef NETATALK 226 case AF_APPLETALK: 227 { 228 struct at_ifaddr *aa; 229 230 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) 231 senderr(EHOSTUNREACH); /* XXX */ 232 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) 233 return (0); 234 /* 235 * In the phase 2 case, need to prepend an mbuf for the llc header. 236 */ 237 if ( aa->aa_flags & AFA_PHASE2 ) { 238 struct llc llc; 239 240 M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT); 241 if (m == NULL) 242 senderr(ENOBUFS); 243 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 244 llc.llc_control = LLC_UI; 245 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); 246 llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); 247 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN); 248 type = htons(m->m_pkthdr.len); 249 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN; 250 } else { 251 type = htons(ETHERTYPE_AT); 252 } 253 break; 254 } 255 #endif /* NETATALK */ 256 257 case pseudo_AF_HDRCMPLT: 258 hdrcmplt = 1; 259 eh = (struct ether_header *)dst->sa_data; 260 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); 261 /* FALLTHROUGH */ 262 263 case AF_UNSPEC: 264 loop_copy = 0; /* if this is for us, don't do it */ 265 eh = (struct ether_header *)dst->sa_data; 266 (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); 267 type = eh->ether_type; 268 break; 269 270 default: 271 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 272 senderr(EAFNOSUPPORT); 273 } 274 275 /* 276 * Add local net header. If no space in first mbuf, 277 * allocate another. 278 */ 279 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 280 if (m == NULL) 281 senderr(ENOBUFS); 282 eh = mtod(m, struct ether_header *); 283 (void)memcpy(&eh->ether_type, &type, 284 sizeof(eh->ether_type)); 285 (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); 286 if (hdrcmplt) 287 (void)memcpy(eh->ether_shost, esrc, 288 sizeof(eh->ether_shost)); 289 else 290 (void)memcpy(eh->ether_shost, IFP2AC(ifp)->ac_enaddr, 291 sizeof(eh->ether_shost)); 292 293 /* 294 * Bridges require special output handling. 295 */ 296 if (ifp->if_bridge) { 297 BRIDGE_OUTPUT(ifp, m, error); 298 return (error); 299 } 300 301 /* 302 * If a simplex interface, and the packet is being sent to our 303 * Ethernet address or a broadcast address, loopback a copy. 304 * XXX To make a simplex device behave exactly like a duplex 305 * device, we should copy in the case of sending to our own 306 * ethernet address (thus letting the original actually appear 307 * on the wire). However, we don't do that here for security 308 * reasons and compatibility with the original behavior. 309 */ 310 if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy && 311 m_tag_find(m, PACKET_TAG_PF_ROUTED, NULL) == NULL) { 312 int csum_flags = 0; 313 314 if (m->m_pkthdr.csum_flags & CSUM_IP) 315 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID); 316 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 317 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 318 319 if (m->m_flags & M_BCAST) { 320 struct mbuf *n; 321 322 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 323 n->m_pkthdr.csum_flags |= csum_flags; 324 if (csum_flags & CSUM_DATA_VALID) 325 n->m_pkthdr.csum_data = 0xffff; 326 (void)if_simloop(ifp, n, dst->sa_family, hlen); 327 } else 328 ifp->if_iqdrops++; 329 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 330 ETHER_ADDR_LEN) == 0) { 331 m->m_pkthdr.csum_flags |= csum_flags; 332 if (csum_flags & CSUM_DATA_VALID) 333 m->m_pkthdr.csum_data = 0xffff; 334 (void) if_simloop(ifp, m, dst->sa_family, hlen); 335 return (0); /* XXX */ 336 } 337 } 338 339 #ifdef DEV_CARP 340 if (ifp->if_carp && 341 (error = carp_output(ifp, m, dst, NULL))) 342 goto bad; 343 #endif 344 345 /* Handle ng_ether(4) processing, if any */ 346 if (IFP2AC(ifp)->ac_netgraph != NULL) { 347 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) { 348 bad: if (m != NULL) 349 m_freem(m); 350 return (error); 351 } 352 if (m == NULL) 353 return (0); 354 } 355 356 /* Continue with link-layer output */ 357 return ether_output_frame(ifp, m); 358 } 359 360 /* 361 * Ethernet link layer output routine to send a raw frame to the device. 362 * 363 * This assumes that the 14 byte Ethernet header is present and contiguous 364 * in the first mbuf (if BRIDGE'ing). 365 */ 366 int 367 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 368 { 369 #if defined(INET) || defined(INET6) 370 struct ip_fw *rule = ip_dn_claim_rule(m); 371 #else 372 void *rule = NULL; 373 #endif 374 int error; 375 376 if (rule == NULL && BDG_ACTIVE(ifp)) { 377 /* 378 * Beware, the bridge code notices the null rcvif and 379 * uses that identify that it's being called from 380 * ether_output as opposd to ether_input. Yech. 381 */ 382 m->m_pkthdr.rcvif = NULL; 383 m = bdg_forward_ptr(m, ifp); 384 if (m != NULL) 385 m_freem(m); 386 return (0); 387 } 388 #if defined(INET) || defined(INET6) 389 if (IPFW_LOADED && ether_ipfw != 0) { 390 if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) { 391 if (m) { 392 m_freem(m); 393 return EACCES; /* pkt dropped */ 394 } else 395 return 0; /* consumed e.g. in a pipe */ 396 } 397 } 398 #endif 399 400 /* 401 * Queue message on interface, update output statistics if 402 * successful, and start output if interface not yet active. 403 */ 404 IFQ_HANDOFF(ifp, m, error); 405 return (error); 406 } 407 408 #if defined(INET) || defined(INET6) 409 /* 410 * ipfw processing for ethernet packets (in and out). 411 * The second parameter is NULL from ether_demux, and ifp from 412 * ether_output_frame. This section of code could be used from 413 * bridge.c as well as long as we use some extra info 414 * to distinguish that case from ether_output_frame(); 415 */ 416 int 417 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 418 struct ip_fw **rule, int shared) 419 { 420 struct ether_header *eh; 421 struct ether_header save_eh; 422 struct mbuf *m; 423 int i; 424 struct ip_fw_args args; 425 426 if (*rule != NULL && fw_one_pass) 427 return 1; /* dummynet packet, already partially processed */ 428 429 /* 430 * I need some amt of data to be contiguous, and in case others need 431 * the packet (shared==1) also better be in the first mbuf. 432 */ 433 m = *m0; 434 i = min( m->m_pkthdr.len, max_protohdr); 435 if ( shared || m->m_len < i) { 436 m = m_pullup(m, i); 437 if (m == NULL) { 438 *m0 = m; 439 return 0; 440 } 441 } 442 eh = mtod(m, struct ether_header *); 443 save_eh = *eh; /* save copy for restore below */ 444 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */ 445 446 args.m = m; /* the packet we are looking at */ 447 args.oif = dst; /* destination, if any */ 448 args.rule = *rule; /* matching rule to restart */ 449 args.next_hop = NULL; /* we do not support forward yet */ 450 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 451 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 452 i = ip_fw_chk_ptr(&args); 453 m = args.m; 454 if (m != NULL) { 455 /* 456 * Restore Ethernet header, as needed, in case the 457 * mbuf chain was replaced by ipfw. 458 */ 459 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 460 if (m == NULL) { 461 *m0 = m; 462 return 0; 463 } 464 if (eh != mtod(m, struct ether_header *)) 465 bcopy(&save_eh, mtod(m, struct ether_header *), 466 ETHER_HDR_LEN); 467 } 468 *m0 = m; 469 *rule = args.rule; 470 471 if ( (i & IP_FW_PORT_DENY_FLAG) || m == NULL) /* drop */ 472 return 0; 473 474 if (i == 0) /* a PASS rule. */ 475 return 1; 476 477 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) { 478 /* 479 * Pass the pkt to dummynet, which consumes it. 480 * If shared, make a copy and keep the original. 481 */ 482 if (shared) { 483 m = m_copypacket(m, M_DONTWAIT); 484 if (m == NULL) 485 return 0; 486 } else { 487 /* 488 * Pass the original to dummynet and 489 * nothing back to the caller 490 */ 491 *m0 = NULL ; 492 } 493 ip_dn_io_ptr(m, (i & 0xffff), 494 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 495 return 0; 496 } 497 /* 498 * XXX at some point add support for divert/forward actions. 499 * If none of the above matches, we have to drop the pkt. 500 */ 501 return 0; 502 } 503 #endif 504 505 /* 506 * Process a received Ethernet packet; the packet is in the 507 * mbuf chain m with the ethernet header at the front. 508 */ 509 static void 510 ether_input(struct ifnet *ifp, struct mbuf *m) 511 { 512 struct ether_header *eh; 513 u_short etype; 514 515 /* 516 * Do consistency checks to verify assumptions 517 * made by code past this point. 518 */ 519 if ((m->m_flags & M_PKTHDR) == 0) { 520 if_printf(ifp, "discard frame w/o packet header\n"); 521 ifp->if_ierrors++; 522 m_freem(m); 523 return; 524 } 525 if (m->m_len < ETHER_HDR_LEN) { 526 /* XXX maybe should pullup? */ 527 if_printf(ifp, "discard frame w/o leading ethernet " 528 "header (len %u pkt len %u)\n", 529 m->m_len, m->m_pkthdr.len); 530 ifp->if_ierrors++; 531 m_freem(m); 532 return; 533 } 534 eh = mtod(m, struct ether_header *); 535 etype = ntohs(eh->ether_type); 536 if (m->m_pkthdr.rcvif == NULL) { 537 if_printf(ifp, "discard frame w/o interface pointer\n"); 538 ifp->if_ierrors++; 539 m_freem(m); 540 return; 541 } 542 #ifdef DIAGNOSTIC 543 if (m->m_pkthdr.rcvif != ifp) { 544 if_printf(ifp, "Warning, frame marked as received on %s\n", 545 m->m_pkthdr.rcvif->if_xname); 546 } 547 #endif 548 549 #ifdef MAC 550 /* 551 * Tag the mbuf with an appropriate MAC label before any other 552 * consumers can get to it. 553 */ 554 mac_create_mbuf_from_ifnet(ifp, m); 555 #endif 556 557 /* 558 * Give bpf a chance at the packet. 559 */ 560 BPF_MTAP(ifp, m); 561 562 if (ifp->if_flags & IFF_MONITOR) { 563 /* 564 * Interface marked for monitoring; discard packet. 565 */ 566 m_freem(m); 567 return; 568 } 569 570 /* If the CRC is still on the packet, trim it off. */ 571 if (m->m_flags & M_HASFCS) { 572 m_adj(m, -ETHER_CRC_LEN); 573 m->m_flags &= ~M_HASFCS; 574 } 575 576 ifp->if_ibytes += m->m_pkthdr.len; 577 578 /* Handle ng_ether(4) processing, if any */ 579 if (IFP2AC(ifp)->ac_netgraph != NULL) { 580 (*ng_ether_input_p)(ifp, &m); 581 if (m == NULL) 582 return; 583 } 584 585 /* 586 * Tap the packet off here for a bridge. bridge_input() 587 * will return NULL if it has consumed the packet, otherwise 588 * it gets processed as normal. Note that bridge_input() 589 * will always return the original packet if we need to 590 * process it locally. 591 */ 592 if (ifp->if_bridge) { 593 BRIDGE_INPUT(ifp, m); 594 if (m == NULL) 595 return; 596 } 597 598 /* Check for bridging mode */ 599 if (BDG_ACTIVE(ifp) ) { 600 struct ifnet *bif; 601 602 /* 603 * Check with bridging code to see how the packet 604 * should be handled. Possibilities are: 605 * 606 * BDG_BCAST broadcast 607 * BDG_MCAST multicast 608 * BDG_LOCAL for local address, don't forward 609 * BDG_DROP discard 610 * ifp forward only to specified interface(s) 611 * 612 * Non-local destinations are handled by passing the 613 * packet back to the bridge code. 614 */ 615 bif = bridge_in_ptr(ifp, eh); 616 if (bif == BDG_DROP) { /* discard packet */ 617 m_freem(m); 618 return; 619 } 620 if (bif != BDG_LOCAL) { /* non-local, forward */ 621 m = bdg_forward_ptr(m, bif); 622 /* 623 * The bridge may consume the packet if it's not 624 * supposed to be passed up or if a problem occurred 625 * while doing its job. This is reflected by it 626 * returning a NULL mbuf pointer. 627 */ 628 if (m == NULL) { 629 if (bif == BDG_BCAST || bif == BDG_MCAST) 630 if_printf(ifp, 631 "bridge dropped %s packet\n", 632 bif == BDG_BCAST ? "broadcast" : 633 "multicast"); 634 return; 635 } 636 /* 637 * But in some cases the bridge may return the 638 * packet for us to free; sigh. 639 */ 640 if (bif != BDG_BCAST && bif != BDG_MCAST) { 641 m_freem(m); 642 return; 643 } 644 } 645 } 646 647 /* First chunk of an mbuf contains good entropy */ 648 if (harvest.ethernet) 649 random_harvest(m, 16, 3, 0, RANDOM_NET); 650 ether_demux(ifp, m); 651 } 652 653 /* 654 * Upper layer processing for a received Ethernet packet. 655 */ 656 void 657 ether_demux(struct ifnet *ifp, struct mbuf *m) 658 { 659 struct ether_header *eh; 660 int isr; 661 u_short ether_type; 662 #if defined(NETATALK) 663 struct llc *l; 664 #endif 665 #if defined(INET) || defined(INET6) 666 struct ip_fw *rule = ip_dn_claim_rule(m); 667 #endif 668 669 KASSERT(ifp != NULL, ("ether_demux: NULL interface pointer")); 670 671 eh = mtod(m, struct ether_header *); 672 ether_type = ntohs(eh->ether_type); 673 674 #if defined(INET) || defined(INET6) 675 if (rule) /* packet was already bridged */ 676 goto post_stats; 677 #endif 678 679 if (!(BDG_ACTIVE(ifp)) && !(ifp->if_bridge) && 680 !(ether_type == ETHERTYPE_VLAN && ifp->if_nvlans > 0)) { 681 #ifdef DEV_CARP 682 /* 683 * XXX: Okay, we need to call carp_forus() and - if it is for 684 * us jump over code that does the normal check 685 * "ac_enaddr == ether_dhost". The check sequence is a bit 686 * different from OpenBSD, so we jump over as few code as 687 * possible, to catch _all_ sanity checks. This needs 688 * evaluation, to see if the carp ether_dhost values break any 689 * of these checks! 690 */ 691 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost)) 692 goto pre_stats; 693 #endif 694 /* 695 * Discard packet if upper layers shouldn't see it because it 696 * was unicast to a different Ethernet address. If the driver 697 * is working properly, then this situation can only happen 698 * when the interface is in promiscuous mode. 699 * 700 * If VLANs are active, and this packet has a VLAN tag, do 701 * not drop it here but pass it on to the VLAN layer, to 702 * give them a chance to consider it as well (e. g. in case 703 * bridging is only active on a VLAN). They will drop it if 704 * it's undesired. 705 */ 706 if ((ifp->if_flags & IFF_PROMISC) != 0 707 && (eh->ether_dhost[0] & 1) == 0 708 && bcmp(eh->ether_dhost, 709 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0 710 && (ifp->if_flags & IFF_PPROMISC) == 0) { 711 m_freem(m); 712 return; 713 } 714 } 715 716 #ifdef DEV_CARP 717 pre_stats: 718 #endif 719 /* Discard packet if interface is not up */ 720 if ((ifp->if_flags & IFF_UP) == 0) { 721 m_freem(m); 722 return; 723 } 724 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 725 if (bcmp(etherbroadcastaddr, eh->ether_dhost, 726 sizeof(etherbroadcastaddr)) == 0) 727 m->m_flags |= M_BCAST; 728 else 729 m->m_flags |= M_MCAST; 730 } 731 if (m->m_flags & (M_BCAST|M_MCAST)) 732 ifp->if_imcasts++; 733 734 #if defined(INET) || defined(INET6) 735 post_stats: 736 if (IPFW_LOADED && ether_ipfw != 0) { 737 if (ether_ipfw_chk(&m, NULL, &rule, 0) == 0) { 738 if (m) 739 m_freem(m); 740 return; 741 } 742 } 743 #endif 744 745 /* 746 * If VLANs are configured on the interface, check to 747 * see if the device performed the decapsulation and 748 * provided us with the tag. 749 */ 750 if (ifp->if_nvlans && 751 m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL) != NULL) { 752 /* 753 * vlan_input() will either recursively call ether_input() 754 * or drop the packet. 755 */ 756 KASSERT(vlan_input_p != NULL,("ether_input: VLAN not loaded!")); 757 (*vlan_input_p)(ifp, m); 758 return; 759 } 760 761 /* 762 * Handle protocols that expect to have the Ethernet header 763 * (and possibly FCS) intact. 764 */ 765 switch (ether_type) { 766 case ETHERTYPE_VLAN: 767 if (ifp->if_nvlans != 0) { 768 KASSERT(vlan_input_p,("ether_input: VLAN not loaded!")); 769 (*vlan_input_p)(ifp, m); 770 } else { 771 ifp->if_noproto++; 772 m_freem(m); 773 } 774 return; 775 } 776 777 /* Strip off Ethernet header. */ 778 m_adj(m, ETHER_HDR_LEN); 779 780 /* If the CRC is still on the packet, trim it off. */ 781 if (m->m_flags & M_HASFCS) { 782 m_adj(m, -ETHER_CRC_LEN); 783 m->m_flags &= ~M_HASFCS; 784 } 785 786 switch (ether_type) { 787 #ifdef INET 788 case ETHERTYPE_IP: 789 if (ip_fastforward(m)) 790 return; 791 isr = NETISR_IP; 792 break; 793 794 case ETHERTYPE_ARP: 795 if (ifp->if_flags & IFF_NOARP) { 796 /* Discard packet if ARP is disabled on interface */ 797 m_freem(m); 798 return; 799 } 800 isr = NETISR_ARP; 801 break; 802 #endif 803 #ifdef IPX 804 case ETHERTYPE_IPX: 805 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 806 return; 807 isr = NETISR_IPX; 808 break; 809 #endif 810 #ifdef INET6 811 case ETHERTYPE_IPV6: 812 isr = NETISR_IPV6; 813 break; 814 #endif 815 #ifdef NETATALK 816 case ETHERTYPE_AT: 817 isr = NETISR_ATALK1; 818 break; 819 case ETHERTYPE_AARP: 820 isr = NETISR_AARP; 821 break; 822 #endif /* NETATALK */ 823 default: 824 #ifdef IPX 825 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 826 return; 827 #endif /* IPX */ 828 #if defined(NETATALK) 829 if (ether_type > ETHERMTU) 830 goto discard; 831 l = mtod(m, struct llc *); 832 if (l->llc_dsap == LLC_SNAP_LSAP && 833 l->llc_ssap == LLC_SNAP_LSAP && 834 l->llc_control == LLC_UI) { 835 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code, 836 sizeof(at_org_code)) == 0 && 837 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 838 m_adj(m, LLC_SNAPFRAMELEN); 839 isr = NETISR_ATALK2; 840 break; 841 } 842 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 843 sizeof(aarp_org_code)) == 0 && 844 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 845 m_adj(m, LLC_SNAPFRAMELEN); 846 isr = NETISR_AARP; 847 break; 848 } 849 } 850 #endif /* NETATALK */ 851 goto discard; 852 } 853 netisr_dispatch(isr, m); 854 return; 855 856 discard: 857 /* 858 * Packet is to be discarded. If netgraph is present, 859 * hand the packet to it for last chance processing; 860 * otherwise dispose of it. 861 */ 862 if (IFP2AC(ifp)->ac_netgraph != NULL) { 863 /* 864 * Put back the ethernet header so netgraph has a 865 * consistent view of inbound packets. 866 */ 867 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 868 (*ng_ether_input_orphan_p)(ifp, m); 869 return; 870 } 871 m_freem(m); 872 } 873 874 /* 875 * Convert Ethernet address to printable (loggable) representation. 876 * This routine is for compatibility; it's better to just use 877 * 878 * printf("%6D", <pointer to address>, ":"); 879 * 880 * since there's no static buffer involved. 881 */ 882 char * 883 ether_sprintf(const u_char *ap) 884 { 885 static char etherbuf[18]; 886 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":"); 887 return (etherbuf); 888 } 889 890 /* 891 * Perform common duties while attaching to interface list 892 */ 893 void 894 ether_ifattach(struct ifnet *ifp, const u_int8_t *llc) 895 { 896 int i; 897 struct ifaddr *ifa; 898 struct sockaddr_dl *sdl; 899 900 ifp->if_type = IFT_ETHER; 901 ifp->if_addrlen = ETHER_ADDR_LEN; 902 ifp->if_hdrlen = ETHER_HDR_LEN; 903 if_attach(ifp); 904 ifp->if_mtu = ETHERMTU; 905 ifp->if_output = ether_output; 906 ifp->if_input = ether_input; 907 ifp->if_resolvemulti = ether_resolvemulti; 908 if (ifp->if_baudrate == 0) 909 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 910 ifp->if_broadcastaddr = etherbroadcastaddr; 911 912 ifa = ifaddr_byindex(ifp->if_index); 913 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__)); 914 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 915 sdl->sdl_type = IFT_ETHER; 916 sdl->sdl_alen = ifp->if_addrlen; 917 bcopy(llc, LLADDR(sdl), ifp->if_addrlen); 918 /* 919 * XXX: This doesn't belong here; we do it until 920 * XXX: all drivers are cleaned up 921 */ 922 if (llc != IFP2AC(ifp)->ac_enaddr) 923 bcopy(llc, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 924 925 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 926 if (ng_ether_attach_p != NULL) 927 (*ng_ether_attach_p)(ifp); 928 if (BDG_LOADED) 929 bdgtakeifaces_ptr(); 930 931 /* Announce Ethernet MAC address if non-zero. */ 932 for (i = 0; i < ifp->if_addrlen; i++) 933 if (llc[i] != 0) 934 break; 935 if (i != ifp->if_addrlen) 936 if_printf(ifp, "Ethernet address: %6D\n", llc, ":"); 937 if (debug_mpsafenet && (ifp->if_flags & IFF_NEEDSGIANT) != 0) 938 if_printf(ifp, "if_start running deferred for Giant\n"); 939 } 940 941 /* 942 * Perform common duties while detaching an Ethernet interface 943 */ 944 void 945 ether_ifdetach(struct ifnet *ifp) 946 { 947 if (IFP2AC(ifp)->ac_netgraph != NULL) 948 (*ng_ether_detach_p)(ifp); 949 950 bpfdetach(ifp); 951 if_detach(ifp); 952 if (BDG_LOADED) 953 bdgtakeifaces_ptr(); 954 } 955 956 SYSCTL_DECL(_net_link); 957 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 958 #if defined(INET) || defined(INET6) 959 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 960 ðer_ipfw,0,"Pass ether pkts through firewall"); 961 #endif 962 963 #if 0 964 /* 965 * This is for reference. We have a table-driven version 966 * of the little-endian crc32 generator, which is faster 967 * than the double-loop. 968 */ 969 uint32_t 970 ether_crc32_le(const uint8_t *buf, size_t len) 971 { 972 size_t i; 973 uint32_t crc; 974 int bit; 975 uint8_t data; 976 977 crc = 0xffffffff; /* initial value */ 978 979 for (i = 0; i < len; i++) { 980 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) 981 carry = (crc ^ data) & 1; 982 crc >>= 1; 983 if (carry) 984 crc = (crc ^ ETHER_CRC_POLY_LE); 985 } 986 987 return (crc); 988 } 989 #else 990 uint32_t 991 ether_crc32_le(const uint8_t *buf, size_t len) 992 { 993 static const uint32_t crctab[] = { 994 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 995 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 996 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 997 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 998 }; 999 size_t i; 1000 uint32_t crc; 1001 1002 crc = 0xffffffff; /* initial value */ 1003 1004 for (i = 0; i < len; i++) { 1005 crc ^= buf[i]; 1006 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1007 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1008 } 1009 1010 return (crc); 1011 } 1012 #endif 1013 1014 uint32_t 1015 ether_crc32_be(const uint8_t *buf, size_t len) 1016 { 1017 size_t i; 1018 uint32_t crc, carry; 1019 int bit; 1020 uint8_t data; 1021 1022 crc = 0xffffffff; /* initial value */ 1023 1024 for (i = 0; i < len; i++) { 1025 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) { 1026 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01); 1027 crc <<= 1; 1028 if (carry) 1029 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1030 } 1031 } 1032 1033 return (crc); 1034 } 1035 1036 int 1037 ether_ioctl(struct ifnet *ifp, int command, caddr_t data) 1038 { 1039 struct ifaddr *ifa = (struct ifaddr *) data; 1040 struct ifreq *ifr = (struct ifreq *) data; 1041 int error = 0; 1042 1043 switch (command) { 1044 case SIOCSIFADDR: 1045 ifp->if_flags |= IFF_UP; 1046 1047 switch (ifa->ifa_addr->sa_family) { 1048 #ifdef INET 1049 case AF_INET: 1050 ifp->if_init(ifp->if_softc); /* before arpwhohas */ 1051 arp_ifinit(ifp, ifa); 1052 break; 1053 #endif 1054 #ifdef IPX 1055 /* 1056 * XXX - This code is probably wrong 1057 */ 1058 case AF_IPX: 1059 { 1060 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); 1061 struct arpcom *ac = IFP2AC(ifp); 1062 1063 if (ipx_nullhost(*ina)) 1064 ina->x_host = 1065 *(union ipx_host *) 1066 ac->ac_enaddr; 1067 else { 1068 bcopy((caddr_t) ina->x_host.c_host, 1069 (caddr_t) ac->ac_enaddr, 1070 sizeof(ac->ac_enaddr)); 1071 } 1072 1073 /* 1074 * Set new address 1075 */ 1076 ifp->if_init(ifp->if_softc); 1077 break; 1078 } 1079 #endif 1080 default: 1081 ifp->if_init(ifp->if_softc); 1082 break; 1083 } 1084 break; 1085 1086 case SIOCGIFADDR: 1087 { 1088 struct sockaddr *sa; 1089 1090 sa = (struct sockaddr *) & ifr->ifr_data; 1091 bcopy(IFP2AC(ifp)->ac_enaddr, 1092 (caddr_t) sa->sa_data, ETHER_ADDR_LEN); 1093 } 1094 break; 1095 1096 case SIOCSIFMTU: 1097 /* 1098 * Set the interface MTU. 1099 */ 1100 if (ifr->ifr_mtu > ETHERMTU) { 1101 error = EINVAL; 1102 } else { 1103 ifp->if_mtu = ifr->ifr_mtu; 1104 } 1105 break; 1106 default: 1107 error = EINVAL; /* XXX netbsd has ENOTTY??? */ 1108 break; 1109 } 1110 return (error); 1111 } 1112 1113 static int 1114 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa, 1115 struct sockaddr *sa) 1116 { 1117 struct sockaddr_dl *sdl; 1118 #ifdef INET 1119 struct sockaddr_in *sin; 1120 #endif 1121 #ifdef INET6 1122 struct sockaddr_in6 *sin6; 1123 #endif 1124 u_char *e_addr; 1125 1126 switch(sa->sa_family) { 1127 case AF_LINK: 1128 /* 1129 * No mapping needed. Just check that it's a valid MC address. 1130 */ 1131 sdl = (struct sockaddr_dl *)sa; 1132 e_addr = LLADDR(sdl); 1133 if (!ETHER_IS_MULTICAST(e_addr)) 1134 return EADDRNOTAVAIL; 1135 *llsa = 0; 1136 return 0; 1137 1138 #ifdef INET 1139 case AF_INET: 1140 sin = (struct sockaddr_in *)sa; 1141 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 1142 return EADDRNOTAVAIL; 1143 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1144 M_NOWAIT|M_ZERO); 1145 if (sdl == NULL) 1146 return ENOMEM; 1147 sdl->sdl_len = sizeof *sdl; 1148 sdl->sdl_family = AF_LINK; 1149 sdl->sdl_index = ifp->if_index; 1150 sdl->sdl_type = IFT_ETHER; 1151 sdl->sdl_alen = ETHER_ADDR_LEN; 1152 e_addr = LLADDR(sdl); 1153 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 1154 *llsa = (struct sockaddr *)sdl; 1155 return 0; 1156 #endif 1157 #ifdef INET6 1158 case AF_INET6: 1159 sin6 = (struct sockaddr_in6 *)sa; 1160 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1161 /* 1162 * An IP6 address of 0 means listen to all 1163 * of the Ethernet multicast address used for IP6. 1164 * (This is used for multicast routers.) 1165 */ 1166 ifp->if_flags |= IFF_ALLMULTI; 1167 *llsa = 0; 1168 return 0; 1169 } 1170 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1171 return EADDRNOTAVAIL; 1172 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1173 M_NOWAIT|M_ZERO); 1174 if (sdl == NULL) 1175 return (ENOMEM); 1176 sdl->sdl_len = sizeof *sdl; 1177 sdl->sdl_family = AF_LINK; 1178 sdl->sdl_index = ifp->if_index; 1179 sdl->sdl_type = IFT_ETHER; 1180 sdl->sdl_alen = ETHER_ADDR_LEN; 1181 e_addr = LLADDR(sdl); 1182 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1183 *llsa = (struct sockaddr *)sdl; 1184 return 0; 1185 #endif 1186 1187 default: 1188 /* 1189 * Well, the text isn't quite right, but it's the name 1190 * that counts... 1191 */ 1192 return EAFNOSUPPORT; 1193 } 1194 } 1195 1196 static moduledata_t ether_mod = { 1197 "ether", 1198 NULL, 1199 0 1200 }; 1201 1202 DECLARE_MODULE(ether, ether_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1203 MODULE_VERSION(ether, 1);
Cache object: c223cae9adefa29e13d901b1561c89c9
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