Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/net/if_ethersubr.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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: releng/5.4/sys/net/if_ethersubr.c 145335 2005-04-20 19:11:07Z cvs2svn $ 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_vlan_var.h> 65 66 #if defined(INET) || defined(INET6) 67 #include <netinet/in.h> 68 #include <netinet/in_var.h> 69 #include <netinet/if_ether.h> 70 #include <netinet/ip_fw.h> 71 #include <netinet/ip_dummynet.h> 72 #endif 73 #ifdef INET6 74 #include <netinet6/nd6.h> 75 #endif 76 77 #ifdef DEV_CARP 78 #include <netinet/ip_carp.h> 79 #endif 80 81 #ifdef IPX 82 #include <netipx/ipx.h> 83 #include <netipx/ipx_if.h> 84 #endif 85 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m); 86 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, 87 struct sockaddr *dst, short *tp, int *hlen); 88 89 #ifdef NETATALK 90 #include <netatalk/at.h> 91 #include <netatalk/at_var.h> 92 #include <netatalk/at_extern.h> 93 94 #define llc_snap_org_code llc_un.type_snap.org_code 95 #define llc_snap_ether_type llc_un.type_snap.ether_type 96 97 extern u_char at_org_code[3]; 98 extern u_char aarp_org_code[3]; 99 #endif /* NETATALK */ 100 101 /* netgraph node hooks for ng_ether(4) */ 102 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 103 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 104 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 105 void (*ng_ether_attach_p)(struct ifnet *ifp); 106 void (*ng_ether_detach_p)(struct ifnet *ifp); 107 108 void (*vlan_input_p)(struct ifnet *, struct mbuf *); 109 110 /* bridge support */ 111 int do_bridge; 112 bridge_in_t *bridge_in_ptr; 113 bdg_forward_t *bdg_forward_ptr; 114 bdgtakeifaces_t *bdgtakeifaces_ptr; 115 struct bdg_softc *ifp2sc; 116 117 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 118 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 119 120 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 121 struct sockaddr *); 122 123 #define senderr(e) do { error = (e); goto bad;} while (0) 124 125 #if defined(INET) || defined(INET6) 126 int 127 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 128 struct ip_fw **rule, int shared); 129 static int ether_ipfw; 130 #endif 131 132 /* 133 * Ethernet output routine. 134 * Encapsulate a packet of type family for the local net. 135 * Use trailer local net encapsulation if enough data in first 136 * packet leaves a multiple of 512 bytes of data in remainder. 137 * Assumes that ifp is actually pointer to arpcom structure. 138 */ 139 int 140 ether_output(struct ifnet *ifp, struct mbuf *m, 141 struct sockaddr *dst, struct rtentry *rt0) 142 { 143 short type; 144 int error, hdrcmplt = 0; 145 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN]; 146 struct ether_header *eh; 147 int loop_copy = 0; 148 int hlen; /* link layer header length */ 149 150 #ifdef MAC 151 error = mac_check_ifnet_transmit(ifp, m); 152 if (error) 153 senderr(error); 154 #endif 155 156 if (ifp->if_flags & IFF_MONITOR) 157 senderr(ENETDOWN); 158 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 159 senderr(ENETDOWN); 160 161 hlen = ETHER_HDR_LEN; 162 switch (dst->sa_family) { 163 #ifdef INET 164 case AF_INET: 165 error = arpresolve(ifp, rt0, m, dst, edst); 166 if (error) 167 return (error == EWOULDBLOCK ? 0 : error); 168 type = htons(ETHERTYPE_IP); 169 break; 170 case AF_ARP: 171 { 172 struct arphdr *ah; 173 ah = mtod(m, struct arphdr *); 174 ah->ar_hrd = htons(ARPHRD_ETHER); 175 176 loop_copy = -1; /* if this is for us, don't do it */ 177 178 switch(ntohs(ah->ar_op)) { 179 case ARPOP_REVREQUEST: 180 case ARPOP_REVREPLY: 181 type = htons(ETHERTYPE_REVARP); 182 break; 183 case ARPOP_REQUEST: 184 case ARPOP_REPLY: 185 default: 186 type = htons(ETHERTYPE_ARP); 187 break; 188 } 189 190 if (m->m_flags & M_BCAST) 191 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN); 192 else 193 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN); 194 195 } 196 break; 197 #endif 198 #ifdef INET6 199 case AF_INET6: 200 error = nd6_storelladdr(ifp, rt0, m, dst, (u_char *)edst); 201 if (error) 202 return error; 203 type = htons(ETHERTYPE_IPV6); 204 break; 205 #endif 206 #ifdef IPX 207 case AF_IPX: 208 if (ef_outputp) { 209 error = ef_outputp(ifp, &m, dst, &type, &hlen); 210 if (error) 211 goto bad; 212 } else 213 type = htons(ETHERTYPE_IPX); 214 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 215 (caddr_t)edst, sizeof (edst)); 216 break; 217 #endif 218 #ifdef NETATALK 219 case AF_APPLETALK: 220 { 221 struct at_ifaddr *aa; 222 223 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) 224 senderr(EHOSTUNREACH); /* XXX */ 225 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) 226 return (0); 227 /* 228 * In the phase 2 case, need to prepend an mbuf for the llc header. 229 */ 230 if ( aa->aa_flags & AFA_PHASE2 ) { 231 struct llc llc; 232 233 M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT); 234 if (m == NULL) 235 senderr(ENOBUFS); 236 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 237 llc.llc_control = LLC_UI; 238 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); 239 llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); 240 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN); 241 type = htons(m->m_pkthdr.len); 242 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN; 243 } else { 244 type = htons(ETHERTYPE_AT); 245 } 246 break; 247 } 248 #endif /* NETATALK */ 249 250 case pseudo_AF_HDRCMPLT: 251 hdrcmplt = 1; 252 eh = (struct ether_header *)dst->sa_data; 253 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); 254 /* FALLTHROUGH */ 255 256 case AF_UNSPEC: 257 loop_copy = -1; /* if this is for us, don't do it */ 258 eh = (struct ether_header *)dst->sa_data; 259 (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); 260 type = eh->ether_type; 261 break; 262 263 default: 264 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 265 senderr(EAFNOSUPPORT); 266 } 267 268 /* 269 * Add local net header. If no space in first mbuf, 270 * allocate another. 271 */ 272 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 273 if (m == NULL) 274 senderr(ENOBUFS); 275 eh = mtod(m, struct ether_header *); 276 (void)memcpy(&eh->ether_type, &type, 277 sizeof(eh->ether_type)); 278 (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); 279 if (hdrcmplt) 280 (void)memcpy(eh->ether_shost, esrc, 281 sizeof(eh->ether_shost)); 282 else 283 (void)memcpy(eh->ether_shost, IFP2AC(ifp)->ac_enaddr, 284 sizeof(eh->ether_shost)); 285 286 /* 287 * If a simplex interface, and the packet is being sent to our 288 * Ethernet address or a broadcast address, loopback a copy. 289 * XXX To make a simplex device behave exactly like a duplex 290 * device, we should copy in the case of sending to our own 291 * ethernet address (thus letting the original actually appear 292 * on the wire). However, we don't do that here for security 293 * reasons and compatibility with the original behavior. 294 */ 295 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 296 int csum_flags = 0; 297 298 if (m->m_pkthdr.csum_flags & CSUM_IP) 299 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID); 300 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 301 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 302 303 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 304 struct mbuf *n; 305 306 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 307 n->m_pkthdr.csum_flags |= csum_flags; 308 if (csum_flags & CSUM_DATA_VALID) 309 n->m_pkthdr.csum_data = 0xffff; 310 (void)if_simloop(ifp, n, dst->sa_family, hlen); 311 } else 312 ifp->if_iqdrops++; 313 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 314 ETHER_ADDR_LEN) == 0) { 315 m->m_pkthdr.csum_flags |= csum_flags; 316 if (csum_flags & CSUM_DATA_VALID) 317 m->m_pkthdr.csum_data = 0xffff; 318 (void) if_simloop(ifp, m, dst->sa_family, hlen); 319 return (0); /* XXX */ 320 } 321 } 322 323 #ifdef DEV_CARP 324 if (ifp->if_carp && 325 (error = carp_output(ifp, m, dst, NULL))) 326 goto bad; 327 #endif 328 329 /* Handle ng_ether(4) processing, if any */ 330 if (ng_ether_output_p != NULL) { 331 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) { 332 bad: if (m != NULL) 333 m_freem(m); 334 return (error); 335 } 336 if (m == NULL) 337 return (0); 338 } 339 340 /* Continue with link-layer output */ 341 return ether_output_frame(ifp, m); 342 } 343 344 /* 345 * Ethernet link layer output routine to send a raw frame to the device. 346 * 347 * This assumes that the 14 byte Ethernet header is present and contiguous 348 * in the first mbuf (if BRIDGE'ing). 349 */ 350 int 351 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 352 { 353 #if defined(INET) || defined(INET6) 354 struct ip_fw *rule = ip_dn_claim_rule(m); 355 #else 356 void *rule = NULL; 357 #endif 358 int error; 359 360 if (rule == NULL && BDG_ACTIVE(ifp)) { 361 /* 362 * Beware, the bridge code notices the null rcvif and 363 * uses that identify that it's being called from 364 * ether_output as opposd to ether_input. Yech. 365 */ 366 m->m_pkthdr.rcvif = NULL; 367 m = bdg_forward_ptr(m, ifp); 368 if (m != NULL) 369 m_freem(m); 370 return (0); 371 } 372 #if defined(INET) || defined(INET6) 373 if (IPFW_LOADED && ether_ipfw != 0) { 374 if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) { 375 if (m) { 376 m_freem(m); 377 return EACCES; /* pkt dropped */ 378 } else 379 return 0; /* consumed e.g. in a pipe */ 380 } 381 } 382 #endif 383 384 /* 385 * Queue message on interface, update output statistics if 386 * successful, and start output if interface not yet active. 387 */ 388 IFQ_HANDOFF(ifp, m, error); 389 return (error); 390 } 391 392 #if defined(INET) || defined(INET6) 393 /* 394 * ipfw processing for ethernet packets (in and out). 395 * The second parameter is NULL from ether_demux, and ifp from 396 * ether_output_frame. This section of code could be used from 397 * bridge.c as well as long as we use some extra info 398 * to distinguish that case from ether_output_frame(); 399 */ 400 int 401 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 402 struct ip_fw **rule, int shared) 403 { 404 struct ether_header *eh; 405 struct ether_header save_eh; 406 struct mbuf *m; 407 int i; 408 struct ip_fw_args args; 409 410 if (*rule != NULL && fw_one_pass) 411 return 1; /* dummynet packet, already partially processed */ 412 413 /* 414 * I need some amt of data to be contiguous, and in case others need 415 * the packet (shared==1) also better be in the first mbuf. 416 */ 417 m = *m0; 418 i = min( m->m_pkthdr.len, max_protohdr); 419 if ( shared || m->m_len < i) { 420 m = m_pullup(m, i); 421 if (m == NULL) { 422 *m0 = m; 423 return 0; 424 } 425 } 426 eh = mtod(m, struct ether_header *); 427 save_eh = *eh; /* save copy for restore below */ 428 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */ 429 430 args.m = m; /* the packet we are looking at */ 431 args.oif = dst; /* destination, if any */ 432 args.rule = *rule; /* matching rule to restart */ 433 args.next_hop = NULL; /* we do not support forward yet */ 434 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 435 i = ip_fw_chk_ptr(&args); 436 m = args.m; 437 if (m != NULL) { 438 /* 439 * Restore Ethernet header, as needed, in case the 440 * mbuf chain was replaced by ipfw. 441 */ 442 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 443 if (m == NULL) { 444 *m0 = m; 445 return 0; 446 } 447 if (eh != mtod(m, struct ether_header *)) 448 bcopy(&save_eh, mtod(m, struct ether_header *), 449 ETHER_HDR_LEN); 450 } 451 *m0 = m; 452 *rule = args.rule; 453 454 if ( (i & IP_FW_PORT_DENY_FLAG) || m == NULL) /* drop */ 455 return 0; 456 457 if (i == 0) /* a PASS rule. */ 458 return 1; 459 460 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) { 461 /* 462 * Pass the pkt to dummynet, which consumes it. 463 * If shared, make a copy and keep the original. 464 */ 465 if (shared) { 466 m = m_copypacket(m, M_DONTWAIT); 467 if (m == NULL) 468 return 0; 469 } else { 470 /* 471 * Pass the original to dummynet and 472 * nothing back to the caller 473 */ 474 *m0 = NULL ; 475 } 476 ip_dn_io_ptr(m, (i & 0xffff), 477 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 478 return 0; 479 } 480 /* 481 * XXX at some point add support for divert/forward actions. 482 * If none of the above matches, we have to drop the pkt. 483 */ 484 return 0; 485 } 486 #endif 487 488 /* 489 * Process a received Ethernet packet; the packet is in the 490 * mbuf chain m with the ethernet header at the front. 491 */ 492 static void 493 ether_input(struct ifnet *ifp, struct mbuf *m) 494 { 495 struct ether_header *eh; 496 u_short etype; 497 498 /* 499 * Do consistency checks to verify assumptions 500 * made by code past this point. 501 */ 502 if ((m->m_flags & M_PKTHDR) == 0) { 503 if_printf(ifp, "discard frame w/o packet header\n"); 504 ifp->if_ierrors++; 505 m_freem(m); 506 return; 507 } 508 if (m->m_len < ETHER_HDR_LEN) { 509 /* XXX maybe should pullup? */ 510 if_printf(ifp, "discard frame w/o leading ethernet " 511 "header (len %u pkt len %u)\n", 512 m->m_len, m->m_pkthdr.len); 513 ifp->if_ierrors++; 514 m_freem(m); 515 return; 516 } 517 eh = mtod(m, struct ether_header *); 518 etype = ntohs(eh->ether_type); 519 if (m->m_pkthdr.len > 520 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 521 if_printf(ifp, "discard oversize frame " 522 "(ether type %x flags %x len %u > max %lu)\n", 523 etype, m->m_flags, m->m_pkthdr.len, 524 ETHER_MAX_FRAME(ifp, etype, 525 m->m_flags & M_HASFCS)); 526 ifp->if_ierrors++; 527 m_freem(m); 528 return; 529 } 530 if (m->m_pkthdr.rcvif == NULL) { 531 if_printf(ifp, "discard frame w/o interface pointer\n"); 532 ifp->if_ierrors++; 533 m_freem(m); 534 return; 535 } 536 #ifdef DIAGNOSTIC 537 if (m->m_pkthdr.rcvif != ifp) { 538 if_printf(ifp, "Warning, frame marked as received on %s\n", 539 m->m_pkthdr.rcvif->if_xname); 540 } 541 #endif 542 543 #ifdef MAC 544 /* 545 * Tag the mbuf with an appropriate MAC label before any other 546 * consumers can get to it. 547 */ 548 mac_create_mbuf_from_ifnet(ifp, m); 549 #endif 550 551 /* 552 * Give bpf a chance at the packet. 553 */ 554 BPF_MTAP(ifp, m); 555 556 if (ifp->if_flags & IFF_MONITOR) { 557 /* 558 * Interface marked for monitoring; discard packet. 559 */ 560 m_freem(m); 561 return; 562 } 563 564 /* If the CRC is still on the packet, trim it off. */ 565 if (m->m_flags & M_HASFCS) { 566 m_adj(m, -ETHER_CRC_LEN); 567 m->m_flags &= ~M_HASFCS; 568 } 569 570 ifp->if_ibytes += m->m_pkthdr.len; 571 572 /* Handle ng_ether(4) processing, if any */ 573 if (ng_ether_input_p != NULL) { 574 (*ng_ether_input_p)(ifp, &m); 575 if (m == NULL) 576 return; 577 } 578 579 /* Check for bridging mode */ 580 if (BDG_ACTIVE(ifp) ) { 581 struct ifnet *bif; 582 583 /* 584 * Check with bridging code to see how the packet 585 * should be handled. Possibilities are: 586 * 587 * BDG_BCAST broadcast 588 * BDG_MCAST multicast 589 * BDG_LOCAL for local address, don't forward 590 * BDG_DROP discard 591 * ifp forward only to specified interface(s) 592 * 593 * Non-local destinations are handled by passing the 594 * packet back to the bridge code. 595 */ 596 bif = bridge_in_ptr(ifp, eh); 597 if (bif == BDG_DROP) { /* discard packet */ 598 m_freem(m); 599 return; 600 } 601 if (bif != BDG_LOCAL) { /* non-local, forward */ 602 m = bdg_forward_ptr(m, bif); 603 /* 604 * The bridge may consume the packet if it's not 605 * supposed to be passed up or if a problem occurred 606 * while doing its job. This is reflected by it 607 * returning a NULL mbuf pointer. 608 */ 609 if (m == NULL) { 610 if (bif == BDG_BCAST || bif == BDG_MCAST) 611 if_printf(ifp, 612 "bridge dropped %s packet\n", 613 bif == BDG_BCAST ? "broadcast" : 614 "multicast"); 615 return; 616 } 617 /* 618 * But in some cases the bridge may return the 619 * packet for us to free; sigh. 620 */ 621 if (bif != BDG_BCAST && bif != BDG_MCAST) { 622 m_freem(m); 623 return; 624 } 625 } 626 } 627 628 /* First chunk of an mbuf contains good entropy */ 629 if (harvest.ethernet) 630 random_harvest(m, 16, 3, 0, RANDOM_NET); 631 ether_demux(ifp, m); 632 } 633 634 /* 635 * Upper layer processing for a received Ethernet packet. 636 */ 637 void 638 ether_demux(struct ifnet *ifp, struct mbuf *m) 639 { 640 struct ether_header *eh; 641 int isr; 642 u_short ether_type; 643 #if defined(NETATALK) 644 struct llc *l; 645 #endif 646 #if defined(INET) || defined(INET6) 647 struct ip_fw *rule = ip_dn_claim_rule(m); 648 #endif 649 650 KASSERT(ifp != NULL, ("ether_demux: NULL interface pointer")); 651 652 eh = mtod(m, struct ether_header *); 653 ether_type = ntohs(eh->ether_type); 654 655 #if defined(INET) || defined(INET6) 656 if (rule) /* packet was already bridged */ 657 goto post_stats; 658 #endif 659 660 if (!(BDG_ACTIVE(ifp)) && 661 !(ether_type == ETHERTYPE_VLAN && ifp->if_nvlans > 0)) { 662 #ifdef DEV_CARP 663 /* 664 * XXX: Okay, we need to call carp_forus() and - if it is for 665 * us jump over code that does the normal check 666 * "ac_enaddr == ether_dhost". The check sequence is a bit 667 * different from OpenBSD, so we jump over as few code as 668 * possible, to catch _all_ sanity checks. This needs 669 * evaluation, to see if the carp ether_dhost values break any 670 * of these checks! 671 */ 672 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost)) 673 goto pre_stats; 674 #endif 675 /* 676 * Discard packet if upper layers shouldn't see it because it 677 * was unicast to a different Ethernet address. If the driver 678 * is working properly, then this situation can only happen 679 * when the interface is in promiscuous mode. 680 * 681 * If VLANs are active, and this packet has a VLAN tag, do 682 * not drop it here but pass it on to the VLAN layer, to 683 * give them a chance to consider it as well (e. g. in case 684 * bridging is only active on a VLAN). They will drop it if 685 * it's undesired. 686 */ 687 if ((ifp->if_flags & IFF_PROMISC) != 0 688 && (eh->ether_dhost[0] & 1) == 0 689 && bcmp(eh->ether_dhost, 690 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0 691 && (ifp->if_flags & IFF_PPROMISC) == 0) { 692 m_freem(m); 693 return; 694 } 695 } 696 697 #ifdef DEV_CARP 698 pre_stats: 699 #endif 700 /* Discard packet if interface is not up */ 701 if ((ifp->if_flags & IFF_UP) == 0) { 702 m_freem(m); 703 return; 704 } 705 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 706 if (bcmp(etherbroadcastaddr, eh->ether_dhost, 707 sizeof(etherbroadcastaddr)) == 0) 708 m->m_flags |= M_BCAST; 709 else 710 m->m_flags |= M_MCAST; 711 } 712 if (m->m_flags & (M_BCAST|M_MCAST)) 713 ifp->if_imcasts++; 714 715 #if defined(INET) || defined(INET6) 716 post_stats: 717 if (IPFW_LOADED && ether_ipfw != 0) { 718 if (ether_ipfw_chk(&m, NULL, &rule, 0) == 0) { 719 if (m) 720 m_freem(m); 721 return; 722 } 723 } 724 #endif 725 726 /* 727 * If VLANs are configured on the interface, check to 728 * see if the device performed the decapsulation and 729 * provided us with the tag. 730 */ 731 if (ifp->if_nvlans && 732 m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL) != NULL) { 733 /* 734 * vlan_input() will either recursively call ether_input() 735 * or drop the packet. 736 */ 737 KASSERT(vlan_input_p != NULL,("ether_input: VLAN not loaded!")); 738 (*vlan_input_p)(ifp, m); 739 return; 740 } 741 742 /* 743 * Handle protocols that expect to have the Ethernet header 744 * (and possibly FCS) intact. 745 */ 746 switch (ether_type) { 747 case ETHERTYPE_VLAN: 748 if (ifp->if_nvlans != 0) { 749 KASSERT(vlan_input_p,("ether_input: VLAN not loaded!")); 750 (*vlan_input_p)(ifp, m); 751 } else { 752 ifp->if_noproto++; 753 m_freem(m); 754 } 755 return; 756 } 757 758 /* Strip off Ethernet header. */ 759 m_adj(m, ETHER_HDR_LEN); 760 761 /* If the CRC is still on the packet, trim it off. */ 762 if (m->m_flags & M_HASFCS) { 763 m_adj(m, -ETHER_CRC_LEN); 764 m->m_flags &= ~M_HASFCS; 765 } 766 767 switch (ether_type) { 768 #ifdef INET 769 case ETHERTYPE_IP: 770 if (ip_fastforward(m)) 771 return; 772 isr = NETISR_IP; 773 break; 774 775 case ETHERTYPE_ARP: 776 if (ifp->if_flags & IFF_NOARP) { 777 /* Discard packet if ARP is disabled on interface */ 778 m_freem(m); 779 return; 780 } 781 isr = NETISR_ARP; 782 break; 783 #endif 784 #ifdef IPX 785 case ETHERTYPE_IPX: 786 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 787 return; 788 isr = NETISR_IPX; 789 break; 790 #endif 791 #ifdef INET6 792 case ETHERTYPE_IPV6: 793 isr = NETISR_IPV6; 794 break; 795 #endif 796 #ifdef NETATALK 797 case ETHERTYPE_AT: 798 isr = NETISR_ATALK1; 799 break; 800 case ETHERTYPE_AARP: 801 isr = NETISR_AARP; 802 break; 803 #endif /* NETATALK */ 804 default: 805 #ifdef IPX 806 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 807 return; 808 #endif /* IPX */ 809 #if defined(NETATALK) 810 if (ether_type > ETHERMTU) 811 goto discard; 812 l = mtod(m, struct llc *); 813 if (l->llc_dsap == LLC_SNAP_LSAP && 814 l->llc_ssap == LLC_SNAP_LSAP && 815 l->llc_control == LLC_UI) { 816 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code, 817 sizeof(at_org_code)) == 0 && 818 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 819 m_adj(m, LLC_SNAPFRAMELEN); 820 isr = NETISR_ATALK2; 821 break; 822 } 823 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 824 sizeof(aarp_org_code)) == 0 && 825 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 826 m_adj(m, LLC_SNAPFRAMELEN); 827 isr = NETISR_AARP; 828 break; 829 } 830 } 831 #endif /* NETATALK */ 832 goto discard; 833 } 834 netisr_dispatch(isr, m); 835 return; 836 837 discard: 838 /* 839 * Packet is to be discarded. If netgraph is present, 840 * hand the packet to it for last chance processing; 841 * otherwise dispose of it. 842 */ 843 if (ng_ether_input_orphan_p != NULL) { 844 /* 845 * Put back the ethernet header so netgraph has a 846 * consistent view of inbound packets. 847 */ 848 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 849 (*ng_ether_input_orphan_p)(ifp, m); 850 return; 851 } 852 m_freem(m); 853 } 854 855 /* 856 * Convert Ethernet address to printable (loggable) representation. 857 * This routine is for compatibility; it's better to just use 858 * 859 * printf("%6D", <pointer to address>, ":"); 860 * 861 * since there's no static buffer involved. 862 */ 863 char * 864 ether_sprintf(const u_char *ap) 865 { 866 static char etherbuf[18]; 867 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":"); 868 return (etherbuf); 869 } 870 871 /* 872 * Perform common duties while attaching to interface list 873 */ 874 void 875 ether_ifattach(struct ifnet *ifp, const u_int8_t *llc) 876 { 877 int i; 878 struct ifaddr *ifa; 879 struct sockaddr_dl *sdl; 880 881 ifp->if_type = IFT_ETHER; 882 ifp->if_addrlen = ETHER_ADDR_LEN; 883 ifp->if_hdrlen = ETHER_HDR_LEN; 884 if_attach(ifp); 885 ifp->if_mtu = ETHERMTU; 886 ifp->if_output = ether_output; 887 ifp->if_input = ether_input; 888 ifp->if_resolvemulti = ether_resolvemulti; 889 if (ifp->if_baudrate == 0) 890 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 891 ifp->if_broadcastaddr = etherbroadcastaddr; 892 893 ifa = ifaddr_byindex(ifp->if_index); 894 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__)); 895 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 896 sdl->sdl_type = IFT_ETHER; 897 sdl->sdl_alen = ifp->if_addrlen; 898 bcopy(llc, LLADDR(sdl), ifp->if_addrlen); 899 /* 900 * XXX: This doesn't belong here; we do it until 901 * XXX: all drivers are cleaned up 902 */ 903 if (llc != IFP2AC(ifp)->ac_enaddr) 904 bcopy(llc, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 905 906 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 907 if (ng_ether_attach_p != NULL) 908 (*ng_ether_attach_p)(ifp); 909 if (BDG_LOADED) 910 bdgtakeifaces_ptr(); 911 912 /* Announce Ethernet MAC address if non-zero. */ 913 for (i = 0; i < ifp->if_addrlen; i++) 914 if (llc[i] != 0) 915 break; 916 if (i != ifp->if_addrlen) 917 if_printf(ifp, "Ethernet address: %6D\n", llc, ":"); 918 if (debug_mpsafenet && (ifp->if_flags & IFF_NEEDSGIANT) != 0) 919 if_printf(ifp, "if_start running deferred for Giant\n"); 920 } 921 922 /* 923 * Perform common duties while detaching an Ethernet interface 924 */ 925 void 926 ether_ifdetach(struct ifnet *ifp) 927 { 928 if (ng_ether_detach_p != NULL) 929 (*ng_ether_detach_p)(ifp); 930 bpfdetach(ifp); 931 if_detach(ifp); 932 if (BDG_LOADED) 933 bdgtakeifaces_ptr(); 934 } 935 936 SYSCTL_DECL(_net_link); 937 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 938 #if defined(INET) || defined(INET6) 939 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 940 ðer_ipfw,0,"Pass ether pkts through firewall"); 941 #endif 942 943 #if 0 944 /* 945 * This is for reference. We have a table-driven version 946 * of the little-endian crc32 generator, which is faster 947 * than the double-loop. 948 */ 949 uint32_t 950 ether_crc32_le(const uint8_t *buf, size_t len) 951 { 952 size_t i; 953 uint32_t crc; 954 int bit; 955 uint8_t data; 956 957 crc = 0xffffffff; /* initial value */ 958 959 for (i = 0; i < len; i++) { 960 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) 961 carry = (crc ^ data) & 1; 962 crc >>= 1; 963 if (carry) 964 crc = (crc ^ ETHER_CRC_POLY_LE); 965 } 966 967 return (crc); 968 } 969 #else 970 uint32_t 971 ether_crc32_le(const uint8_t *buf, size_t len) 972 { 973 static const uint32_t crctab[] = { 974 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 975 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 976 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 977 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 978 }; 979 size_t i; 980 uint32_t crc; 981 982 crc = 0xffffffff; /* initial value */ 983 984 for (i = 0; i < len; i++) { 985 crc ^= buf[i]; 986 crc = (crc >> 4) ^ crctab[crc & 0xf]; 987 crc = (crc >> 4) ^ crctab[crc & 0xf]; 988 } 989 990 return (crc); 991 } 992 #endif 993 994 uint32_t 995 ether_crc32_be(const uint8_t *buf, size_t len) 996 { 997 size_t i; 998 uint32_t crc, carry; 999 int bit; 1000 uint8_t data; 1001 1002 crc = 0xffffffff; /* initial value */ 1003 1004 for (i = 0; i < len; i++) { 1005 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) { 1006 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01); 1007 crc <<= 1; 1008 if (carry) 1009 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1010 } 1011 } 1012 1013 return (crc); 1014 } 1015 1016 int 1017 ether_ioctl(struct ifnet *ifp, int command, caddr_t data) 1018 { 1019 struct ifaddr *ifa = (struct ifaddr *) data; 1020 struct ifreq *ifr = (struct ifreq *) data; 1021 int error = 0; 1022 1023 switch (command) { 1024 case SIOCSIFADDR: 1025 ifp->if_flags |= IFF_UP; 1026 1027 switch (ifa->ifa_addr->sa_family) { 1028 #ifdef INET 1029 case AF_INET: 1030 ifp->if_init(ifp->if_softc); /* before arpwhohas */ 1031 arp_ifinit(ifp, ifa); 1032 break; 1033 #endif 1034 #ifdef IPX 1035 /* 1036 * XXX - This code is probably wrong 1037 */ 1038 case AF_IPX: 1039 { 1040 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); 1041 struct arpcom *ac = IFP2AC(ifp); 1042 1043 if (ipx_nullhost(*ina)) 1044 ina->x_host = 1045 *(union ipx_host *) 1046 ac->ac_enaddr; 1047 else { 1048 bcopy((caddr_t) ina->x_host.c_host, 1049 (caddr_t) ac->ac_enaddr, 1050 sizeof(ac->ac_enaddr)); 1051 } 1052 1053 /* 1054 * Set new address 1055 */ 1056 ifp->if_init(ifp->if_softc); 1057 break; 1058 } 1059 #endif 1060 default: 1061 ifp->if_init(ifp->if_softc); 1062 break; 1063 } 1064 break; 1065 1066 case SIOCGIFADDR: 1067 { 1068 struct sockaddr *sa; 1069 1070 sa = (struct sockaddr *) & ifr->ifr_data; 1071 bcopy(IFP2AC(ifp)->ac_enaddr, 1072 (caddr_t) sa->sa_data, ETHER_ADDR_LEN); 1073 } 1074 break; 1075 1076 case SIOCSIFMTU: 1077 /* 1078 * Set the interface MTU. 1079 */ 1080 if (ifr->ifr_mtu > ETHERMTU) { 1081 error = EINVAL; 1082 } else { 1083 ifp->if_mtu = ifr->ifr_mtu; 1084 } 1085 break; 1086 default: 1087 error = EINVAL; /* XXX netbsd has ENOTTY??? */ 1088 break; 1089 } 1090 return (error); 1091 } 1092 1093 static int 1094 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa, 1095 struct sockaddr *sa) 1096 { 1097 struct sockaddr_dl *sdl; 1098 #ifdef INET 1099 struct sockaddr_in *sin; 1100 #endif 1101 #ifdef INET6 1102 struct sockaddr_in6 *sin6; 1103 #endif 1104 u_char *e_addr; 1105 1106 switch(sa->sa_family) { 1107 case AF_LINK: 1108 /* 1109 * No mapping needed. Just check that it's a valid MC address. 1110 */ 1111 sdl = (struct sockaddr_dl *)sa; 1112 e_addr = LLADDR(sdl); 1113 if (!ETHER_IS_MULTICAST(e_addr)) 1114 return EADDRNOTAVAIL; 1115 *llsa = 0; 1116 return 0; 1117 1118 #ifdef INET 1119 case AF_INET: 1120 sin = (struct sockaddr_in *)sa; 1121 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 1122 return EADDRNOTAVAIL; 1123 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1124 M_WAITOK|M_ZERO); 1125 sdl->sdl_len = sizeof *sdl; 1126 sdl->sdl_family = AF_LINK; 1127 sdl->sdl_index = ifp->if_index; 1128 sdl->sdl_type = IFT_ETHER; 1129 sdl->sdl_alen = ETHER_ADDR_LEN; 1130 e_addr = LLADDR(sdl); 1131 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 1132 *llsa = (struct sockaddr *)sdl; 1133 return 0; 1134 #endif 1135 #ifdef INET6 1136 case AF_INET6: 1137 sin6 = (struct sockaddr_in6 *)sa; 1138 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1139 /* 1140 * An IP6 address of 0 means listen to all 1141 * of the Ethernet multicast address used for IP6. 1142 * (This is used for multicast routers.) 1143 */ 1144 ifp->if_flags |= IFF_ALLMULTI; 1145 *llsa = 0; 1146 return 0; 1147 } 1148 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1149 return EADDRNOTAVAIL; 1150 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1151 M_WAITOK|M_ZERO); 1152 sdl->sdl_len = sizeof *sdl; 1153 sdl->sdl_family = AF_LINK; 1154 sdl->sdl_index = ifp->if_index; 1155 sdl->sdl_type = IFT_ETHER; 1156 sdl->sdl_alen = ETHER_ADDR_LEN; 1157 e_addr = LLADDR(sdl); 1158 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1159 *llsa = (struct sockaddr *)sdl; 1160 return 0; 1161 #endif 1162 1163 default: 1164 /* 1165 * Well, the text isn't quite right, but it's the name 1166 * that counts... 1167 */ 1168 return EAFNOSUPPORT; 1169 } 1170 } 1171 1172 static moduledata_t ether_mod = { 1173 "ether", 1174 NULL, 1175 0 1176 }; 1177 1178 DECLARE_MODULE(ether, ether_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1179 MODULE_VERSION(ether, 1);
Cache object: 0191d652a910796cd3114615e12aab0f
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]