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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: releng/6.1/sys/net/if_ethersubr.c 156275 2006-03-04 09:24:30Z oleg $ 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 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *); 119 int (*bridge_output_p)(struct ifnet *, struct mbuf *, 120 struct sockaddr *, struct rtentry *); 121 void (*bridge_dn_p)(struct mbuf *, struct ifnet *); 122 123 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 124 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 125 126 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 127 struct sockaddr *); 128 129 /* XXX: should be in an arp support file, not here */ 130 MALLOC_DEFINE(M_ARPCOM, "arpcom", "802.* interface internals"); 131 132 #define senderr(e) do { error = (e); goto bad;} while (0) 133 134 #if defined(INET) || defined(INET6) 135 int 136 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 137 struct ip_fw **rule, int shared); 138 static int ether_ipfw; 139 #endif 140 141 /* 142 * Ethernet output routine. 143 * Encapsulate a packet of type family for the local net. 144 * Use trailer local net encapsulation if enough data in first 145 * packet leaves a multiple of 512 bytes of data in remainder. 146 */ 147 int 148 ether_output(struct ifnet *ifp, struct mbuf *m, 149 struct sockaddr *dst, struct rtentry *rt0) 150 { 151 short type; 152 int error, hdrcmplt = 0; 153 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN]; 154 struct ether_header *eh; 155 int loop_copy = 1; 156 int hlen; /* link layer header length */ 157 158 #ifdef MAC 159 error = mac_check_ifnet_transmit(ifp, m); 160 if (error) 161 senderr(error); 162 #endif 163 164 if (ifp->if_flags & IFF_MONITOR) 165 senderr(ENETDOWN); 166 if (!((ifp->if_flags & IFF_UP) && 167 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 168 senderr(ENETDOWN); 169 170 hlen = ETHER_HDR_LEN; 171 switch (dst->sa_family) { 172 #ifdef INET 173 case AF_INET: 174 error = arpresolve(ifp, rt0, m, dst, edst); 175 if (error) 176 return (error == EWOULDBLOCK ? 0 : error); 177 type = htons(ETHERTYPE_IP); 178 break; 179 case AF_ARP: 180 { 181 struct arphdr *ah; 182 ah = mtod(m, struct arphdr *); 183 ah->ar_hrd = htons(ARPHRD_ETHER); 184 185 loop_copy = 0; /* if this is for us, don't do it */ 186 187 switch(ntohs(ah->ar_op)) { 188 case ARPOP_REVREQUEST: 189 case ARPOP_REVREPLY: 190 type = htons(ETHERTYPE_REVARP); 191 break; 192 case ARPOP_REQUEST: 193 case ARPOP_REPLY: 194 default: 195 type = htons(ETHERTYPE_ARP); 196 break; 197 } 198 199 if (m->m_flags & M_BCAST) 200 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN); 201 else 202 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN); 203 204 } 205 break; 206 #endif 207 #ifdef INET6 208 case AF_INET6: 209 error = nd6_storelladdr(ifp, rt0, m, dst, (u_char *)edst); 210 if (error) 211 return error; 212 type = htons(ETHERTYPE_IPV6); 213 break; 214 #endif 215 #ifdef IPX 216 case AF_IPX: 217 if (ef_outputp) { 218 error = ef_outputp(ifp, &m, dst, &type, &hlen); 219 if (error) 220 goto bad; 221 } else 222 type = htons(ETHERTYPE_IPX); 223 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 224 (caddr_t)edst, sizeof (edst)); 225 break; 226 #endif 227 #ifdef NETATALK 228 case AF_APPLETALK: 229 { 230 struct at_ifaddr *aa; 231 232 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) 233 senderr(EHOSTUNREACH); /* XXX */ 234 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) 235 return (0); 236 /* 237 * In the phase 2 case, need to prepend an mbuf for the llc header. 238 */ 239 if ( aa->aa_flags & AFA_PHASE2 ) { 240 struct llc llc; 241 242 M_PREPEND(m, LLC_SNAPFRAMELEN, M_DONTWAIT); 243 if (m == NULL) 244 senderr(ENOBUFS); 245 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 246 llc.llc_control = LLC_UI; 247 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); 248 llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); 249 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN); 250 type = htons(m->m_pkthdr.len); 251 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN; 252 } else { 253 type = htons(ETHERTYPE_AT); 254 } 255 break; 256 } 257 #endif /* NETATALK */ 258 259 case pseudo_AF_HDRCMPLT: 260 hdrcmplt = 1; 261 eh = (struct ether_header *)dst->sa_data; 262 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); 263 /* FALLTHROUGH */ 264 265 case AF_UNSPEC: 266 loop_copy = 0; /* if this is for us, don't do it */ 267 eh = (struct ether_header *)dst->sa_data; 268 (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); 269 type = eh->ether_type; 270 break; 271 272 default: 273 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 274 senderr(EAFNOSUPPORT); 275 } 276 277 /* 278 * Add local net header. If no space in first mbuf, 279 * allocate another. 280 */ 281 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 282 if (m == NULL) 283 senderr(ENOBUFS); 284 eh = mtod(m, struct ether_header *); 285 (void)memcpy(&eh->ether_type, &type, 286 sizeof(eh->ether_type)); 287 (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); 288 if (hdrcmplt) 289 (void)memcpy(eh->ether_shost, esrc, 290 sizeof(eh->ether_shost)); 291 else 292 (void)memcpy(eh->ether_shost, IFP2ENADDR(ifp), 293 sizeof(eh->ether_shost)); 294 295 /* 296 * Bridges require special output handling. 297 */ 298 if (ifp->if_bridge) { 299 BRIDGE_OUTPUT(ifp, m, error); 300 return (error); 301 } 302 303 /* 304 * If a simplex interface, and the packet is being sent to our 305 * Ethernet address or a broadcast address, loopback a copy. 306 * XXX To make a simplex device behave exactly like a duplex 307 * device, we should copy in the case of sending to our own 308 * ethernet address (thus letting the original actually appear 309 * on the wire). However, we don't do that here for security 310 * reasons and compatibility with the original behavior. 311 */ 312 if ((ifp->if_flags & IFF_SIMPLEX) && loop_copy && 313 m_tag_find(m, PACKET_TAG_PF_ROUTED, NULL) == NULL) { 314 int csum_flags = 0; 315 316 if (m->m_pkthdr.csum_flags & CSUM_IP) 317 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID); 318 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 319 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 320 321 if (m->m_flags & M_BCAST) { 322 struct mbuf *n; 323 324 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 325 n->m_pkthdr.csum_flags |= csum_flags; 326 if (csum_flags & CSUM_DATA_VALID) 327 n->m_pkthdr.csum_data = 0xffff; 328 (void)if_simloop(ifp, n, dst->sa_family, hlen); 329 } else 330 ifp->if_iqdrops++; 331 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 332 ETHER_ADDR_LEN) == 0) { 333 m->m_pkthdr.csum_flags |= csum_flags; 334 if (csum_flags & CSUM_DATA_VALID) 335 m->m_pkthdr.csum_data = 0xffff; 336 (void) if_simloop(ifp, m, dst->sa_family, hlen); 337 return (0); /* XXX */ 338 } 339 } 340 341 #ifdef DEV_CARP 342 if (ifp->if_carp && 343 (error = carp_output(ifp, m, dst, NULL))) 344 goto bad; 345 #endif 346 347 /* Handle ng_ether(4) processing, if any */ 348 if (IFP2AC(ifp)->ac_netgraph != NULL) { 349 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) { 350 bad: if (m != NULL) 351 m_freem(m); 352 return (error); 353 } 354 if (m == NULL) 355 return (0); 356 } 357 358 /* Continue with link-layer output */ 359 return ether_output_frame(ifp, m); 360 } 361 362 /* 363 * Ethernet link layer output routine to send a raw frame to the device. 364 * 365 * This assumes that the 14 byte Ethernet header is present and contiguous 366 * in the first mbuf (if BRIDGE'ing). 367 */ 368 int 369 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 370 { 371 #if defined(INET) || defined(INET6) 372 struct ip_fw *rule = ip_dn_claim_rule(m); 373 #else 374 void *rule = NULL; 375 #endif 376 int error; 377 378 if (rule == NULL && BDG_ACTIVE(ifp)) { 379 /* 380 * Beware, the bridge code notices the null rcvif and 381 * uses that identify that it's being called from 382 * ether_output as opposd to ether_input. Yech. 383 */ 384 m->m_pkthdr.rcvif = NULL; 385 m = bdg_forward_ptr(m, ifp); 386 if (m != NULL) 387 m_freem(m); 388 return (0); 389 } 390 #if defined(INET) || defined(INET6) 391 if (IPFW_LOADED && ether_ipfw != 0) { 392 if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) { 393 if (m) { 394 m_freem(m); 395 return EACCES; /* pkt dropped */ 396 } else 397 return 0; /* consumed e.g. in a pipe */ 398 } 399 } 400 #endif 401 402 /* 403 * Queue message on interface, update output statistics if 404 * successful, and start output if interface not yet active. 405 */ 406 IFQ_HANDOFF(ifp, m, error); 407 return (error); 408 } 409 410 #if defined(INET) || defined(INET6) 411 /* 412 * ipfw processing for ethernet packets (in and out). 413 * The second parameter is NULL from ether_demux, and ifp from 414 * ether_output_frame. This section of code could be used from 415 * bridge.c as well as long as we use some extra info 416 * to distinguish that case from ether_output_frame(); 417 */ 418 int 419 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 420 struct ip_fw **rule, int shared) 421 { 422 struct ether_header *eh; 423 struct ether_header save_eh; 424 struct mbuf *m; 425 int i; 426 struct ip_fw_args args; 427 428 if (*rule != NULL && fw_one_pass) 429 return 1; /* dummynet packet, already partially processed */ 430 431 /* 432 * I need some amt of data to be contiguous, and in case others need 433 * the packet (shared==1) also better be in the first mbuf. 434 */ 435 m = *m0; 436 i = min( m->m_pkthdr.len, max_protohdr); 437 if ( shared || m->m_len < i) { 438 m = m_pullup(m, i); 439 if (m == NULL) { 440 *m0 = m; 441 return 0; 442 } 443 } 444 eh = mtod(m, struct ether_header *); 445 save_eh = *eh; /* save copy for restore below */ 446 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */ 447 448 args.m = m; /* the packet we are looking at */ 449 args.oif = dst; /* destination, if any */ 450 args.rule = *rule; /* matching rule to restart */ 451 args.next_hop = NULL; /* we do not support forward yet */ 452 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 453 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 454 i = ip_fw_chk_ptr(&args); 455 m = args.m; 456 if (m != NULL) { 457 /* 458 * Restore Ethernet header, as needed, in case the 459 * mbuf chain was replaced by ipfw. 460 */ 461 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 462 if (m == NULL) { 463 *m0 = m; 464 return 0; 465 } 466 if (eh != mtod(m, struct ether_header *)) 467 bcopy(&save_eh, mtod(m, struct ether_header *), 468 ETHER_HDR_LEN); 469 } 470 *m0 = m; 471 *rule = args.rule; 472 473 if (i == IP_FW_DENY) /* drop */ 474 return 0; 475 476 KASSERT(m != NULL, ("ether_ipfw_chk: m is NULL")); 477 478 if (i == IP_FW_PASS) /* a PASS rule. */ 479 return 1; 480 481 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) { 482 /* 483 * Pass the pkt to dummynet, which consumes it. 484 * If shared, make a copy and keep the original. 485 */ 486 if (shared) { 487 m = m_copypacket(m, M_DONTWAIT); 488 if (m == NULL) 489 return 0; 490 } else { 491 /* 492 * Pass the original to dummynet and 493 * nothing back to the caller 494 */ 495 *m0 = NULL ; 496 } 497 ip_dn_io_ptr(m, dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 498 return 0; 499 } 500 /* 501 * XXX at some point add support for divert/forward actions. 502 * If none of the above matches, we have to drop the pkt. 503 */ 504 return 0; 505 } 506 #endif 507 508 /* 509 * Process a received Ethernet packet; the packet is in the 510 * mbuf chain m with the ethernet header at the front. 511 */ 512 static void 513 ether_input(struct ifnet *ifp, struct mbuf *m) 514 { 515 struct ether_header *eh; 516 u_short etype; 517 518 /* 519 * Do consistency checks to verify assumptions 520 * made by code past this point. 521 */ 522 if ((m->m_flags & M_PKTHDR) == 0) { 523 if_printf(ifp, "discard frame w/o packet header\n"); 524 ifp->if_ierrors++; 525 m_freem(m); 526 return; 527 } 528 if (m->m_len < ETHER_HDR_LEN) { 529 /* XXX maybe should pullup? */ 530 if_printf(ifp, "discard frame w/o leading ethernet " 531 "header (len %u pkt len %u)\n", 532 m->m_len, m->m_pkthdr.len); 533 ifp->if_ierrors++; 534 m_freem(m); 535 return; 536 } 537 eh = mtod(m, struct ether_header *); 538 etype = ntohs(eh->ether_type); 539 if (m->m_pkthdr.len > 540 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 541 if_printf(ifp, "discard oversize frame " 542 "(ether type %x flags %x len %u > max %lu)\n", 543 etype, m->m_flags, m->m_pkthdr.len, 544 ETHER_MAX_FRAME(ifp, etype, 545 m->m_flags & M_HASFCS)); 546 ifp->if_ierrors++; 547 m_freem(m); 548 return; 549 } 550 if (m->m_pkthdr.rcvif == NULL) { 551 if_printf(ifp, "discard frame w/o interface pointer\n"); 552 ifp->if_ierrors++; 553 m_freem(m); 554 return; 555 } 556 #ifdef DIAGNOSTIC 557 if (m->m_pkthdr.rcvif != ifp) { 558 if_printf(ifp, "Warning, frame marked as received on %s\n", 559 m->m_pkthdr.rcvif->if_xname); 560 } 561 #endif 562 563 #ifdef MAC 564 /* 565 * Tag the mbuf with an appropriate MAC label before any other 566 * consumers can get to it. 567 */ 568 mac_create_mbuf_from_ifnet(ifp, m); 569 #endif 570 571 /* 572 * Give bpf a chance at the packet. 573 */ 574 BPF_MTAP(ifp, m); 575 576 if (ifp->if_flags & IFF_MONITOR) { 577 /* 578 * Interface marked for monitoring; discard packet. 579 */ 580 m_freem(m); 581 return; 582 } 583 584 /* If the CRC is still on the packet, trim it off. */ 585 if (m->m_flags & M_HASFCS) { 586 m_adj(m, -ETHER_CRC_LEN); 587 m->m_flags &= ~M_HASFCS; 588 } 589 590 ifp->if_ibytes += m->m_pkthdr.len; 591 592 /* Handle ng_ether(4) processing, if any */ 593 if (IFP2AC(ifp)->ac_netgraph != NULL) { 594 (*ng_ether_input_p)(ifp, &m); 595 if (m == NULL) 596 return; 597 } 598 599 /* 600 * Tap the packet off here for a bridge. bridge_input() 601 * will return NULL if it has consumed the packet, otherwise 602 * it gets processed as normal. Note that bridge_input() 603 * will always return the original packet if we need to 604 * process it locally. 605 */ 606 if (ifp->if_bridge) { 607 BRIDGE_INPUT(ifp, m); 608 if (m == NULL) 609 return; 610 } 611 612 /* Check for bridging mode */ 613 if (BDG_ACTIVE(ifp) ) 614 if ((m = bridge_in_ptr(ifp, m)) == NULL) 615 return; 616 617 /* First chunk of an mbuf contains good entropy */ 618 if (harvest.ethernet) 619 random_harvest(m, 16, 3, 0, RANDOM_NET); 620 ether_demux(ifp, m); 621 } 622 623 /* 624 * Upper layer processing for a received Ethernet packet. 625 */ 626 void 627 ether_demux(struct ifnet *ifp, struct mbuf *m) 628 { 629 struct ether_header *eh; 630 int isr; 631 u_short ether_type; 632 #if defined(NETATALK) 633 struct llc *l; 634 #endif 635 #if defined(INET) || defined(INET6) 636 struct ip_fw *rule = ip_dn_claim_rule(m); 637 #endif 638 639 KASSERT(ifp != NULL, ("ether_demux: NULL interface pointer")); 640 641 eh = mtod(m, struct ether_header *); 642 ether_type = ntohs(eh->ether_type); 643 644 #if defined(INET) || defined(INET6) 645 if (rule) /* packet was already bridged */ 646 goto post_stats; 647 #endif 648 649 if (!(BDG_ACTIVE(ifp)) && !(ifp->if_bridge) && 650 !((ether_type == ETHERTYPE_VLAN || m->m_flags & M_VLANTAG) && 651 ifp->if_nvlans > 0)) { 652 #ifdef DEV_CARP 653 /* 654 * XXX: Okay, we need to call carp_forus() and - if it is for 655 * us jump over code that does the normal check 656 * "IFP2ENADDR(ifp) == ether_dhost". The check sequence is a bit 657 * different from OpenBSD, so we jump over as few code as 658 * possible, to catch _all_ sanity checks. This needs 659 * evaluation, to see if the carp ether_dhost values break any 660 * of these checks! 661 */ 662 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost)) 663 goto pre_stats; 664 #endif 665 /* 666 * Discard packet if upper layers shouldn't see it because it 667 * was unicast to a different Ethernet address. If the driver 668 * is working properly, then this situation can only happen 669 * when the interface is in promiscuous mode. 670 * 671 * If VLANs are active, and this packet has a VLAN tag, do 672 * not drop it here but pass it on to the VLAN layer, to 673 * give them a chance to consider it as well (e. g. in case 674 * bridging is only active on a VLAN). They will drop it if 675 * it's undesired. 676 */ 677 if ((ifp->if_flags & IFF_PROMISC) != 0 678 && !ETHER_IS_MULTICAST(eh->ether_dhost) 679 && bcmp(eh->ether_dhost, 680 IFP2ENADDR(ifp), ETHER_ADDR_LEN) != 0 681 && (ifp->if_flags & IFF_PPROMISC) == 0) { 682 m_freem(m); 683 return; 684 } 685 } 686 687 #ifdef DEV_CARP 688 pre_stats: 689 #endif 690 /* Discard packet if interface is not up */ 691 if ((ifp->if_flags & IFF_UP) == 0) { 692 m_freem(m); 693 return; 694 } 695 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 696 if (bcmp(etherbroadcastaddr, eh->ether_dhost, 697 sizeof(etherbroadcastaddr)) == 0) 698 m->m_flags |= M_BCAST; 699 else 700 m->m_flags |= M_MCAST; 701 } 702 if (m->m_flags & (M_BCAST|M_MCAST)) 703 ifp->if_imcasts++; 704 705 #if defined(INET) || defined(INET6) 706 post_stats: 707 if (IPFW_LOADED && ether_ipfw != 0) { 708 if (ether_ipfw_chk(&m, NULL, &rule, 0) == 0) { 709 if (m) 710 m_freem(m); 711 return; 712 } 713 } 714 #endif 715 716 /* 717 * Check to see if the device performed the VLAN decapsulation and 718 * provided us with the tag. 719 */ 720 if (m->m_flags & M_VLANTAG) { 721 /* 722 * If no VLANs are configured, drop. 723 */ 724 if (ifp->if_nvlans == 0) { 725 ifp->if_noproto++; 726 m_freem(m); 727 return; 728 } 729 /* 730 * vlan_input() will either recursively call ether_input() 731 * or drop the packet. 732 */ 733 KASSERT(vlan_input_p != NULL,("ether_input: VLAN not loaded!")); 734 (*vlan_input_p)(ifp, m); 735 return; 736 } 737 738 /* 739 * Handle protocols that expect to have the Ethernet header 740 * (and possibly FCS) intact. 741 */ 742 switch (ether_type) { 743 case ETHERTYPE_VLAN: 744 if (ifp->if_nvlans != 0) { 745 KASSERT(vlan_input_p,("ether_input: VLAN not loaded!")); 746 (*vlan_input_p)(ifp, m); 747 } else { 748 ifp->if_noproto++; 749 m_freem(m); 750 } 751 return; 752 } 753 754 /* Strip off Ethernet header. */ 755 m_adj(m, ETHER_HDR_LEN); 756 757 /* If the CRC is still on the packet, trim it off. */ 758 if (m->m_flags & M_HASFCS) { 759 m_adj(m, -ETHER_CRC_LEN); 760 m->m_flags &= ~M_HASFCS; 761 } 762 763 switch (ether_type) { 764 #ifdef INET 765 case ETHERTYPE_IP: 766 if (ip_fastforward(m)) 767 return; 768 isr = NETISR_IP; 769 break; 770 771 case ETHERTYPE_ARP: 772 if (ifp->if_flags & IFF_NOARP) { 773 /* Discard packet if ARP is disabled on interface */ 774 m_freem(m); 775 return; 776 } 777 isr = NETISR_ARP; 778 break; 779 #endif 780 #ifdef IPX 781 case ETHERTYPE_IPX: 782 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 783 return; 784 isr = NETISR_IPX; 785 break; 786 #endif 787 #ifdef INET6 788 case ETHERTYPE_IPV6: 789 isr = NETISR_IPV6; 790 break; 791 #endif 792 #ifdef NETATALK 793 case ETHERTYPE_AT: 794 isr = NETISR_ATALK1; 795 break; 796 case ETHERTYPE_AARP: 797 isr = NETISR_AARP; 798 break; 799 #endif /* NETATALK */ 800 default: 801 #ifdef IPX 802 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 803 return; 804 #endif /* IPX */ 805 #if defined(NETATALK) 806 if (ether_type > ETHERMTU) 807 goto discard; 808 l = mtod(m, struct llc *); 809 if (l->llc_dsap == LLC_SNAP_LSAP && 810 l->llc_ssap == LLC_SNAP_LSAP && 811 l->llc_control == LLC_UI) { 812 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code, 813 sizeof(at_org_code)) == 0 && 814 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 815 m_adj(m, LLC_SNAPFRAMELEN); 816 isr = NETISR_ATALK2; 817 break; 818 } 819 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 820 sizeof(aarp_org_code)) == 0 && 821 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 822 m_adj(m, LLC_SNAPFRAMELEN); 823 isr = NETISR_AARP; 824 break; 825 } 826 } 827 #endif /* NETATALK */ 828 goto discard; 829 } 830 netisr_dispatch(isr, m); 831 return; 832 833 discard: 834 /* 835 * Packet is to be discarded. If netgraph is present, 836 * hand the packet to it for last chance processing; 837 * otherwise dispose of it. 838 */ 839 if (IFP2AC(ifp)->ac_netgraph != NULL) { 840 /* 841 * Put back the ethernet header so netgraph has a 842 * consistent view of inbound packets. 843 */ 844 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 845 (*ng_ether_input_orphan_p)(ifp, m); 846 return; 847 } 848 m_freem(m); 849 } 850 851 /* 852 * Convert Ethernet address to printable (loggable) representation. 853 * This routine is for compatibility; it's better to just use 854 * 855 * printf("%6D", <pointer to address>, ":"); 856 * 857 * since there's no static buffer involved. 858 */ 859 char * 860 ether_sprintf(const u_char *ap) 861 { 862 static char etherbuf[18]; 863 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":"); 864 return (etherbuf); 865 } 866 867 /* 868 * Perform common duties while attaching to interface list 869 */ 870 void 871 ether_ifattach(struct ifnet *ifp, const u_int8_t *llc) 872 { 873 int i; 874 struct ifaddr *ifa; 875 struct sockaddr_dl *sdl; 876 877 ifp->if_addrlen = ETHER_ADDR_LEN; 878 ifp->if_hdrlen = ETHER_HDR_LEN; 879 if_attach(ifp); 880 ifp->if_mtu = ETHERMTU; 881 ifp->if_output = ether_output; 882 ifp->if_input = ether_input; 883 ifp->if_resolvemulti = ether_resolvemulti; 884 if (ifp->if_baudrate == 0) 885 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 886 ifp->if_broadcastaddr = etherbroadcastaddr; 887 888 ifa = ifaddr_byindex(ifp->if_index); 889 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__)); 890 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 891 sdl->sdl_type = IFT_ETHER; 892 sdl->sdl_alen = ifp->if_addrlen; 893 bcopy(llc, LLADDR(sdl), ifp->if_addrlen); 894 /* 895 * XXX: This doesn't belong here; we do it until 896 * XXX: all drivers are cleaned up 897 */ 898 if (llc != IFP2ENADDR(ifp)) 899 bcopy(llc, IFP2ENADDR(ifp), ifp->if_addrlen); 900 901 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 902 if (ng_ether_attach_p != NULL) 903 (*ng_ether_attach_p)(ifp); 904 if (BDG_LOADED) 905 bdgtakeifaces_ptr(); 906 907 /* Announce Ethernet MAC address if non-zero. */ 908 for (i = 0; i < ifp->if_addrlen; i++) 909 if (llc[i] != 0) 910 break; 911 if (i != ifp->if_addrlen) 912 if_printf(ifp, "Ethernet address: %6D\n", llc, ":"); 913 if (debug_mpsafenet && (ifp->if_flags & IFF_NEEDSGIANT) != 0) 914 if_printf(ifp, "if_start running deferred for Giant\n"); 915 } 916 917 /* 918 * Perform common duties while detaching an Ethernet interface 919 */ 920 void 921 ether_ifdetach(struct ifnet *ifp) 922 { 923 if (IFP2AC(ifp)->ac_netgraph != NULL) 924 (*ng_ether_detach_p)(ifp); 925 926 bpfdetach(ifp); 927 if_detach(ifp); 928 if (BDG_LOADED) 929 bdgtakeifaces_ptr(); 930 } 931 932 SYSCTL_DECL(_net_link); 933 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 934 #if defined(INET) || defined(INET6) 935 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 936 ðer_ipfw,0,"Pass ether pkts through firewall"); 937 #endif 938 939 #if 0 940 /* 941 * This is for reference. We have a table-driven version 942 * of the little-endian crc32 generator, which is faster 943 * than the double-loop. 944 */ 945 uint32_t 946 ether_crc32_le(const uint8_t *buf, size_t len) 947 { 948 size_t i; 949 uint32_t crc; 950 int bit; 951 uint8_t data; 952 953 crc = 0xffffffff; /* initial value */ 954 955 for (i = 0; i < len; i++) { 956 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) 957 carry = (crc ^ data) & 1; 958 crc >>= 1; 959 if (carry) 960 crc = (crc ^ ETHER_CRC_POLY_LE); 961 } 962 963 return (crc); 964 } 965 #else 966 uint32_t 967 ether_crc32_le(const uint8_t *buf, size_t len) 968 { 969 static const uint32_t crctab[] = { 970 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 971 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 972 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 973 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 974 }; 975 size_t i; 976 uint32_t crc; 977 978 crc = 0xffffffff; /* initial value */ 979 980 for (i = 0; i < len; i++) { 981 crc ^= buf[i]; 982 crc = (crc >> 4) ^ crctab[crc & 0xf]; 983 crc = (crc >> 4) ^ crctab[crc & 0xf]; 984 } 985 986 return (crc); 987 } 988 #endif 989 990 uint32_t 991 ether_crc32_be(const uint8_t *buf, size_t len) 992 { 993 size_t i; 994 uint32_t crc, carry; 995 int bit; 996 uint8_t data; 997 998 crc = 0xffffffff; /* initial value */ 999 1000 for (i = 0; i < len; i++) { 1001 for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) { 1002 carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01); 1003 crc <<= 1; 1004 if (carry) 1005 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1006 } 1007 } 1008 1009 return (crc); 1010 } 1011 1012 int 1013 ether_ioctl(struct ifnet *ifp, int command, caddr_t data) 1014 { 1015 struct ifaddr *ifa = (struct ifaddr *) data; 1016 struct ifreq *ifr = (struct ifreq *) data; 1017 int error = 0; 1018 1019 switch (command) { 1020 case SIOCSIFADDR: 1021 ifp->if_flags |= IFF_UP; 1022 1023 switch (ifa->ifa_addr->sa_family) { 1024 #ifdef INET 1025 case AF_INET: 1026 ifp->if_init(ifp->if_softc); /* before arpwhohas */ 1027 arp_ifinit(ifp, ifa); 1028 break; 1029 #endif 1030 #ifdef IPX 1031 /* 1032 * XXX - This code is probably wrong 1033 */ 1034 case AF_IPX: 1035 { 1036 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); 1037 1038 if (ipx_nullhost(*ina)) 1039 ina->x_host = 1040 *(union ipx_host *) 1041 IFP2ENADDR(ifp); 1042 else { 1043 bcopy((caddr_t) ina->x_host.c_host, 1044 (caddr_t) IFP2ENADDR(ifp), 1045 ETHER_ADDR_LEN); 1046 } 1047 1048 /* 1049 * Set new address 1050 */ 1051 ifp->if_init(ifp->if_softc); 1052 break; 1053 } 1054 #endif 1055 default: 1056 ifp->if_init(ifp->if_softc); 1057 break; 1058 } 1059 break; 1060 1061 case SIOCGIFADDR: 1062 { 1063 struct sockaddr *sa; 1064 1065 sa = (struct sockaddr *) & ifr->ifr_data; 1066 bcopy(IFP2ENADDR(ifp), 1067 (caddr_t) sa->sa_data, ETHER_ADDR_LEN); 1068 } 1069 break; 1070 1071 case SIOCSIFMTU: 1072 /* 1073 * Set the interface MTU. 1074 */ 1075 if (ifr->ifr_mtu > ETHERMTU) { 1076 error = EINVAL; 1077 } else { 1078 ifp->if_mtu = ifr->ifr_mtu; 1079 } 1080 break; 1081 default: 1082 error = EINVAL; /* XXX netbsd has ENOTTY??? */ 1083 break; 1084 } 1085 return (error); 1086 } 1087 1088 static int 1089 ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa, 1090 struct sockaddr *sa) 1091 { 1092 struct sockaddr_dl *sdl; 1093 #ifdef INET 1094 struct sockaddr_in *sin; 1095 #endif 1096 #ifdef INET6 1097 struct sockaddr_in6 *sin6; 1098 #endif 1099 u_char *e_addr; 1100 1101 switch(sa->sa_family) { 1102 case AF_LINK: 1103 /* 1104 * No mapping needed. Just check that it's a valid MC address. 1105 */ 1106 sdl = (struct sockaddr_dl *)sa; 1107 e_addr = LLADDR(sdl); 1108 if (!ETHER_IS_MULTICAST(e_addr)) 1109 return EADDRNOTAVAIL; 1110 *llsa = 0; 1111 return 0; 1112 1113 #ifdef INET 1114 case AF_INET: 1115 sin = (struct sockaddr_in *)sa; 1116 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 1117 return EADDRNOTAVAIL; 1118 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1119 M_NOWAIT|M_ZERO); 1120 if (sdl == NULL) 1121 return ENOMEM; 1122 sdl->sdl_len = sizeof *sdl; 1123 sdl->sdl_family = AF_LINK; 1124 sdl->sdl_index = ifp->if_index; 1125 sdl->sdl_type = IFT_ETHER; 1126 sdl->sdl_alen = ETHER_ADDR_LEN; 1127 e_addr = LLADDR(sdl); 1128 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 1129 *llsa = (struct sockaddr *)sdl; 1130 return 0; 1131 #endif 1132 #ifdef INET6 1133 case AF_INET6: 1134 sin6 = (struct sockaddr_in6 *)sa; 1135 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1136 /* 1137 * An IP6 address of 0 means listen to all 1138 * of the Ethernet multicast address used for IP6. 1139 * (This is used for multicast routers.) 1140 */ 1141 ifp->if_flags |= IFF_ALLMULTI; 1142 *llsa = 0; 1143 return 0; 1144 } 1145 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1146 return EADDRNOTAVAIL; 1147 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1148 M_NOWAIT|M_ZERO); 1149 if (sdl == NULL) 1150 return (ENOMEM); 1151 sdl->sdl_len = sizeof *sdl; 1152 sdl->sdl_family = AF_LINK; 1153 sdl->sdl_index = ifp->if_index; 1154 sdl->sdl_type = IFT_ETHER; 1155 sdl->sdl_alen = ETHER_ADDR_LEN; 1156 e_addr = LLADDR(sdl); 1157 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1158 *llsa = (struct sockaddr *)sdl; 1159 return 0; 1160 #endif 1161 1162 default: 1163 /* 1164 * Well, the text isn't quite right, but it's the name 1165 * that counts... 1166 */ 1167 return EAFNOSUPPORT; 1168 } 1169 } 1170 1171 static void* 1172 ether_alloc(u_char type, struct ifnet *ifp) 1173 { 1174 struct arpcom *ac; 1175 1176 ac = malloc(sizeof(struct arpcom), M_ARPCOM, M_WAITOK | M_ZERO); 1177 ac->ac_ifp = ifp; 1178 1179 return (ac); 1180 } 1181 1182 static void 1183 ether_free(void *com, u_char type) 1184 { 1185 1186 free(com, M_ARPCOM); 1187 } 1188 1189 static int 1190 ether_modevent(module_t mod, int type, void *data) 1191 { 1192 1193 switch (type) { 1194 case MOD_LOAD: 1195 if_register_com_alloc(IFT_ETHER, ether_alloc, ether_free); 1196 break; 1197 case MOD_UNLOAD: 1198 if_deregister_com_alloc(IFT_ETHER); 1199 break; 1200 default: 1201 return EOPNOTSUPP; 1202 } 1203 1204 return (0); 1205 } 1206 1207 static moduledata_t ether_mod = { 1208 "ether", 1209 ether_modevent, 1210 0 1211 }; 1212 1213 DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY); 1214 MODULE_VERSION(ether, 1);
Cache object: 5ce1e3ee0fd05a55ed637db2888ea0b4
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