if_ethersubr.c revision 126951
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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 34 * $FreeBSD: head/sys/net/if_ethersubr.c 126951 2004-03-14 05:24:54Z mdodd $ 35 */ 36 37#include "opt_atalk.h" 38#include "opt_inet.h" 39#include "opt_inet6.h" 40#include "opt_ipx.h" 41#include "opt_bdg.h" 42#include "opt_mac.h" 43#include "opt_netgraph.h" 44 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/kernel.h> 48#include <sys/mac.h> 49#include <sys/malloc.h> 50#include <sys/mbuf.h> 51#include <sys/random.h> 52#include <sys/socket.h> 53#include <sys/sockio.h> 54#include <sys/sysctl.h> 55 56#include <net/if.h> 57#include <net/netisr.h> 58#include <net/route.h> 59#include <net/if_llc.h> 60#include <net/if_dl.h> 61#include <net/if_types.h> 62#include <net/bpf.h> 63#include <net/ethernet.h> 64#include <net/bridge.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 IPX 79#include <netipx/ipx.h> 80#include <netipx/ipx_if.h> 81int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m); 82int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, 83 struct sockaddr *dst, short *tp, int *hlen); 84#endif 85 86#ifdef NETATALK 87#include <netatalk/at.h> 88#include <netatalk/at_var.h> 89#include <netatalk/at_extern.h> 90 91#define llc_snap_org_code llc_un.type_snap.org_code 92#define llc_snap_ether_type llc_un.type_snap.ether_type 93 94extern u_char at_org_code[3]; 95extern u_char aarp_org_code[3]; 96#endif /* NETATALK */ 97 98/* netgraph node hooks for ng_ether(4) */ 99void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 100void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 101int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 102void (*ng_ether_attach_p)(struct ifnet *ifp); 103void (*ng_ether_detach_p)(struct ifnet *ifp); 104 105void (*vlan_input_p)(struct ifnet *, struct mbuf *); 106 107/* bridge support */ 108int do_bridge; 109bridge_in_t *bridge_in_ptr; 110bdg_forward_t *bdg_forward_ptr; 111bdgtakeifaces_t *bdgtakeifaces_ptr; 112struct bdg_softc *ifp2sc; 113 114static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 115 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 116 117static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 118 struct sockaddr *); 119 120#define senderr(e) do { error = (e); goto bad;} while (0) 121#define IFP2AC(IFP) ((struct arpcom *)IFP) 122 123int 124ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 125 struct ip_fw **rule, int shared); 126static int ether_ipfw; 127 128/* 129 * Ethernet output routine. 130 * Encapsulate a packet of type family for the local net. 131 * Use trailer local net encapsulation if enough data in first 132 * packet leaves a multiple of 512 bytes of data in remainder. 133 * Assumes that ifp is actually pointer to arpcom structure. 134 */ 135int 136ether_output(struct ifnet *ifp, struct mbuf *m, 137 struct sockaddr *dst, struct rtentry *rt0) 138{ 139 short type; 140 int error = 0, hdrcmplt = 0; 141 u_char esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN]; 142 struct rtentry *rt; 143 struct ether_header *eh; 144 int loop_copy = 0; 145 int hlen; /* link layer header length */ 146 struct arpcom *ac = IFP2AC(ifp); 147 148#ifdef MAC 149 error = mac_check_ifnet_transmit(ifp, m); 150 if (error) 151 senderr(error); 152#endif 153 154 if (ifp->if_flags & IFF_MONITOR) 155 senderr(ENETDOWN); 156 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 157 senderr(ENETDOWN); 158 159 error = rt_check(&rt, &rt0, dst); 160 if (error) 161 goto bad; 162 163 hlen = ETHER_HDR_LEN; 164 switch (dst->sa_family) { 165#ifdef INET 166 case AF_INET: 167 if (!arpresolve(ifp, rt, m, dst, edst, rt0)) 168 return (0); /* if not yet resolved */ 169 type = htons(ETHERTYPE_IP); 170 break; 171 case AF_ARP: 172 { 173 struct arphdr *ah; 174 ah = mtod(m, struct arphdr *); 175 ah->ar_hrd = htons(ARPHRD_ETHER); 176 177 loop_copy = -1; /* if this is for us, don't do it */ 178 179 switch(ntohs(ah->ar_op)) { 180 case ARPOP_REVREQUEST: 181 case ARPOP_REVREPLY: 182 type = htons(ETHERTYPE_REVARP); 183 break; 184 case ARPOP_REQUEST: 185 case ARPOP_REPLY: 186 default: 187 type = htons(ETHERTYPE_ARP); 188 break; 189 } 190 191 if (m->m_flags & M_BCAST) 192 bcopy(ifp->if_broadcastaddr, edst, ETHER_ADDR_LEN); 193 else 194 bcopy(ar_tha(ah), edst, ETHER_ADDR_LEN); 195 196 } 197 break; 198#endif 199#ifdef INET6 200 case AF_INET6: 201 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) { 202 /* Something bad happened */ 203 return(0); 204 } 205 type = htons(ETHERTYPE_IPV6); 206 break; 207#endif 208#ifdef IPX 209 case AF_IPX: 210 if (ef_outputp) { 211 error = ef_outputp(ifp, &m, dst, &type, &hlen); 212 if (error) 213 goto bad; 214 } else 215 type = htons(ETHERTYPE_IPX); 216 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 217 (caddr_t)edst, sizeof (edst)); 218 break; 219#endif 220#ifdef NETATALK 221 case AF_APPLETALK: 222 { 223 struct at_ifaddr *aa; 224 225 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { 226 goto bad; 227 } 228 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) 229 return (0); 230 /* 231 * In the phase 2 case, need to prepend an mbuf for the llc header. 232 * Since we must preserve the value of m, which is passed to us by 233 * value, we m_copy() the first mbuf, and use it for our llc header. 234 */ 235 if ( aa->aa_flags & AFA_PHASE2 ) { 236 struct llc llc; 237 238 M_PREPEND(m, LLC_SNAPFRAMELEN, M_TRYWAIT); 239 if (m == NULL) 240 senderr(ENOBUFS); 241 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 242 llc.llc_control = LLC_UI; 243 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); 244 llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); 245 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN); 246 type = htons(m->m_pkthdr.len); 247 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN; 248 } else { 249 type = htons(ETHERTYPE_AT); 250 } 251 break; 252 } 253#endif /* NETATALK */ 254 255 case pseudo_AF_HDRCMPLT: 256 hdrcmplt = 1; 257 eh = (struct ether_header *)dst->sa_data; 258 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); 259 /* FALLTHROUGH */ 260 261 case AF_UNSPEC: 262 loop_copy = -1; /* if this is for us, don't do it */ 263 eh = (struct ether_header *)dst->sa_data; 264 (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); 265 type = eh->ether_type; 266 break; 267 268 default: 269 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 270 senderr(EAFNOSUPPORT); 271 } 272 273 /* 274 * Add local net header. If no space in first mbuf, 275 * allocate another. 276 */ 277 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 278 if (m == NULL) 279 senderr(ENOBUFS); 280 eh = mtod(m, struct ether_header *); 281 (void)memcpy(&eh->ether_type, &type, 282 sizeof(eh->ether_type)); 283 (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); 284 if (hdrcmplt) 285 (void)memcpy(eh->ether_shost, esrc, 286 sizeof(eh->ether_shost)); 287 else 288 (void)memcpy(eh->ether_shost, ac->ac_enaddr, 289 sizeof(eh->ether_shost)); 290 291 /* 292 * If a simplex interface, and the packet is being sent to our 293 * Ethernet address or a broadcast address, loopback a copy. 294 * XXX To make a simplex device behave exactly like a duplex 295 * device, we should copy in the case of sending to our own 296 * ethernet address (thus letting the original actually appear 297 * on the wire). However, we don't do that here for security 298 * reasons and compatibility with the original behavior. 299 */ 300 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 301 int csum_flags = 0; 302 303 if (m->m_pkthdr.csum_flags & CSUM_IP) 304 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID); 305 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 306 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 307 308 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 309 struct mbuf *n; 310 311 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 312 n->m_pkthdr.csum_flags |= csum_flags; 313 if (csum_flags & CSUM_DATA_VALID) 314 n->m_pkthdr.csum_data = 0xffff; 315 (void)if_simloop(ifp, n, dst->sa_family, hlen); 316 } else 317 ifp->if_iqdrops++; 318 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 319 ETHER_ADDR_LEN) == 0) { 320 m->m_pkthdr.csum_flags |= csum_flags; 321 if (csum_flags & CSUM_DATA_VALID) 322 m->m_pkthdr.csum_data = 0xffff; 323 (void) if_simloop(ifp, m, dst->sa_family, hlen); 324 return (0); /* XXX */ 325 } 326 } 327 328 /* Handle ng_ether(4) processing, if any */ 329 if (ng_ether_output_p != NULL) { 330 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) { 331bad: if (m != NULL) 332 m_freem(m); 333 return (error); 334 } 335 if (m == NULL) 336 return (0); 337 } 338 339 /* Continue with link-layer output */ 340 return ether_output_frame(ifp, m); 341} 342 343/* 344 * Ethernet link layer output routine to send a raw frame to the device. 345 * 346 * This assumes that the 14 byte Ethernet header is present and contiguous 347 * in the first mbuf (if BRIDGE'ing). 348 */ 349int 350ether_output_frame(struct ifnet *ifp, struct mbuf *m) 351{ 352 struct ip_fw *rule = ip_dn_claim_rule(m); 353 354 if (rule == NULL && BDG_ACTIVE(ifp)) { 355 /* 356 * Beware, the bridge code notices the null rcvif and 357 * uses that identify that it's being called from 358 * ether_output as opposd to ether_input. Yech. 359 */ 360 m->m_pkthdr.rcvif = NULL; 361 m = bdg_forward_ptr(m, ifp); 362 if (m != NULL) 363 m_freem(m); 364 return (0); 365 } 366 if (IPFW_LOADED && ether_ipfw != 0) { 367 if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) { 368 if (m) { 369 m_freem(m); 370 return EACCES; /* pkt dropped */ 371 } else 372 return 0; /* consumed e.g. in a pipe */ 373 } 374 } 375 376 /* 377 * Queue message on interface, update output statistics if 378 * successful, and start output if interface not yet active. 379 */ 380 return (IF_HANDOFF(&ifp->if_snd, m, ifp) ? 0 : ENOBUFS); 381} 382 383/* 384 * ipfw processing for ethernet packets (in and out). 385 * The second parameter is NULL from ether_demux, and ifp from 386 * ether_output_frame. This section of code could be used from 387 * bridge.c as well as long as we use some extra info 388 * to distinguish that case from ether_output_frame(); 389 */ 390int 391ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 392 struct ip_fw **rule, int shared) 393{ 394 struct ether_header *eh; 395 struct ether_header save_eh; 396 struct mbuf *m; 397 int i; 398 struct ip_fw_args args; 399 400 if (*rule != NULL && fw_one_pass) 401 return 1; /* dummynet packet, already partially processed */ 402 403 /* 404 * I need some amt of data to be contiguous, and in case others need 405 * the packet (shared==1) also better be in the first mbuf. 406 */ 407 m = *m0; 408 i = min( m->m_pkthdr.len, max_protohdr); 409 if ( shared || m->m_len < i) { 410 m = m_pullup(m, i); 411 if (m == NULL) { 412 *m0 = m; 413 return 0; 414 } 415 } 416 eh = mtod(m, struct ether_header *); 417 save_eh = *eh; /* save copy for restore below */ 418 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */ 419 420 args.m = m; /* the packet we are looking at */ 421 args.oif = dst; /* destination, if any */ 422 args.rule = *rule; /* matching rule to restart */ 423 args.next_hop = NULL; /* we do not support forward yet */ 424 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 425 i = ip_fw_chk_ptr(&args); 426 m = args.m; 427 if (m != NULL) { 428 /* 429 * Restore Ethernet header, as needed, in case the 430 * mbuf chain was replaced by ipfw. 431 */ 432 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 433 if (m == NULL) { 434 *m0 = m; 435 return 0; 436 } 437 if (eh != mtod(m, struct ether_header *)) 438 bcopy(&save_eh, mtod(m, struct ether_header *), 439 ETHER_HDR_LEN); 440 } 441 *m0 = m; 442 *rule = args.rule; 443 444 if ( (i & IP_FW_PORT_DENY_FLAG) || m == NULL) /* drop */ 445 return 0; 446 447 if (i == 0) /* a PASS rule. */ 448 return 1; 449 450 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) { 451 /* 452 * Pass the pkt to dummynet, which consumes it. 453 * If shared, make a copy and keep the original. 454 */ 455 if (shared) { 456 m = m_copypacket(m, M_DONTWAIT); 457 if (m == NULL) 458 return 0; 459 } else { 460 /* 461 * Pass the original to dummynet and 462 * nothing back to the caller 463 */ 464 *m0 = NULL ; 465 } 466 ip_dn_io_ptr(m, (i & 0xffff), 467 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 468 return 0; 469 } 470 /* 471 * XXX at some point add support for divert/forward actions. 472 * If none of the above matches, we have to drop the pkt. 473 */ 474 return 0; 475} 476 477/* 478 * Process a received Ethernet packet; the packet is in the 479 * mbuf chain m with the ethernet header at the front. 480 */ 481static void 482ether_input(struct ifnet *ifp, struct mbuf *m) 483{ 484 struct ether_header *eh; 485 u_short etype; 486 487 /* 488 * Do consistency checks to verify assumptions 489 * made by code past this point. 490 */ 491 if ((m->m_flags & M_PKTHDR) == 0) { 492 if_printf(ifp, "discard frame w/o packet header\n"); 493 ifp->if_ierrors++; 494 m_freem(m); 495 return; 496 } 497 if (m->m_len < ETHER_HDR_LEN) { 498 /* XXX maybe should pullup? */ 499 if_printf(ifp, "discard frame w/o leading ethernet " 500 "header (len %u pkt len %u)\n", 501 m->m_len, m->m_pkthdr.len); 502 ifp->if_ierrors++; 503 m_freem(m); 504 return; 505 } 506 eh = mtod(m, struct ether_header *); 507 etype = ntohs(eh->ether_type); 508 if (m->m_pkthdr.len > 509 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 510 if_printf(ifp, "discard oversize frame " 511 "(ether type %x flags %x len %u > max %lu)\n", 512 etype, m->m_flags, m->m_pkthdr.len, 513 ETHER_MAX_FRAME(ifp, etype, 514 m->m_flags & M_HASFCS)); 515 ifp->if_ierrors++; 516 m_freem(m); 517 return; 518 } 519 if (m->m_pkthdr.rcvif == NULL) { 520 if_printf(ifp, "discard frame w/o interface pointer\n"); 521 ifp->if_ierrors++; 522 m_freem(m); 523 return; 524 } 525#ifdef DIAGNOSTIC 526 if (m->m_pkthdr.rcvif != ifp) { 527 if_printf(ifp, "Warning, frame marked as received on %s\n", 528 m->m_pkthdr.rcvif->if_xname); 529 } 530#endif 531 532#ifdef MAC 533 /* 534 * Tag the mbuf with an appropriate MAC label before any other 535 * consumers can get to it. 536 */ 537 mac_create_mbuf_from_ifnet(ifp, m); 538#endif 539 540 /* 541 * Give bpf a chance at the packet. 542 */ 543 BPF_MTAP(ifp, m); 544 545 if (ifp->if_flags & IFF_MONITOR) { 546 /* 547 * Interface marked for monitoring; discard packet. 548 */ 549 m_freem(m); 550 return; 551 } 552 553 /* If the CRC is still on the packet, trim it off. */ 554 if (m->m_flags & M_HASFCS) { 555 m_adj(m, -ETHER_CRC_LEN); 556 m->m_flags &= ~M_HASFCS; 557 } 558 559 ifp->if_ibytes += m->m_pkthdr.len; 560 561 /* Handle ng_ether(4) processing, if any */ 562 if (ng_ether_input_p != NULL) { 563 (*ng_ether_input_p)(ifp, &m); 564 if (m == NULL) 565 return; 566 } 567 568 /* Check for bridging mode */ 569 if (BDG_ACTIVE(ifp) ) { 570 struct ifnet *bif; 571 572 /* 573 * Check with bridging code to see how the packet 574 * should be handled. Possibilities are: 575 * 576 * BDG_BCAST broadcast 577 * BDG_MCAST multicast 578 * BDG_LOCAL for local address, don't forward 579 * BDG_DROP discard 580 * ifp forward only to specified interface(s) 581 * 582 * Non-local destinations are handled by passing the 583 * packet back to the bridge code. 584 */ 585 bif = bridge_in_ptr(ifp, eh); 586 if (bif == BDG_DROP) { /* discard packet */ 587 m_freem(m); 588 return; 589 } 590 if (bif != BDG_LOCAL) { /* non-local, forward */ 591 m = bdg_forward_ptr(m, bif); 592 /* 593 * The bridge may consume the packet if it's not 594 * supposed to be passed up or if a problem occurred 595 * while doing its job. This is reflected by it 596 * returning a NULL mbuf pointer. 597 */ 598 if (m == NULL) { 599 if (bif == BDG_BCAST || bif == BDG_MCAST) 600 if_printf(ifp, 601 "bridge dropped %s packet\n", 602 bif == BDG_BCAST ? "broadcast" : 603 "multicast"); 604 return; 605 } 606 /* 607 * But in some cases the bridge may return the 608 * packet for us to free; sigh. 609 */ 610 if (bif != BDG_BCAST && bif != BDG_MCAST) { 611 m_freem(m); 612 return; 613 } 614 } 615 } 616 617 ether_demux(ifp, m); 618 /* First chunk of an mbuf contains good entropy */ 619 if (harvest.ethernet) 620 random_harvest(m, 16, 3, 0, RANDOM_NET); 621} 622 623/* 624 * Upper layer processing for a received Ethernet packet. 625 */ 626void 627ether_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 struct ip_fw *rule = ip_dn_claim_rule(m); 636 637 KASSERT(ifp != NULL, ("ether_demux: NULL interface pointer")); 638 639 eh = mtod(m, struct ether_header *); 640 641 if (rule) /* packet was already bridged */ 642 goto post_stats; 643 644 if (!(BDG_ACTIVE(ifp))) { 645 /* 646 * Discard packet if upper layers shouldn't see it because it 647 * was unicast to a different Ethernet address. If the driver 648 * is working properly, then this situation can only happen 649 * when the interface is in promiscuous mode. 650 */ 651 if ((ifp->if_flags & IFF_PROMISC) != 0 652 && (eh->ether_dhost[0] & 1) == 0 653 && bcmp(eh->ether_dhost, 654 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0 655 && (ifp->if_flags & IFF_PPROMISC) == 0) { 656 m_freem(m); 657 return; 658 } 659 } 660 661 /* Discard packet if interface is not up */ 662 if ((ifp->if_flags & IFF_UP) == 0) { 663 m_freem(m); 664 return; 665 } 666 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 667 if (bcmp(etherbroadcastaddr, eh->ether_dhost, 668 sizeof(etherbroadcastaddr)) == 0) 669 m->m_flags |= M_BCAST; 670 else 671 m->m_flags |= M_MCAST; 672 } 673 if (m->m_flags & (M_BCAST|M_MCAST)) 674 ifp->if_imcasts++; 675 676post_stats: 677 if (IPFW_LOADED && ether_ipfw != 0) { 678 if (ether_ipfw_chk(&m, NULL, &rule, 0) == 0) { 679 if (m) 680 m_freem(m); 681 return; 682 } 683 } 684 685 /* 686 * If VLANs are configured on the interface, check to 687 * see if the device performed the decapsulation and 688 * provided us with the tag. 689 */ 690 if (ifp->if_nvlans && 691 m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL) != NULL) { 692 /* 693 * vlan_input() will either recursively call ether_input() 694 * or drop the packet. 695 */ 696 KASSERT(vlan_input_p != NULL,("ether_input: VLAN not loaded!")); 697 (*vlan_input_p)(ifp, m); 698 return; 699 } 700 701 ether_type = ntohs(eh->ether_type); 702 703 /* 704 * Handle protocols that expect to have the Ethernet header 705 * (and possibly FCS) intact. 706 */ 707 switch (ether_type) { 708 case ETHERTYPE_VLAN: 709 if (ifp->if_nvlans != 0) { 710 KASSERT(vlan_input_p,("ether_input: VLAN not loaded!")); 711 (*vlan_input_p)(ifp, m); 712 } else { 713 ifp->if_noproto++; 714 m_freem(m); 715 } 716 return; 717 } 718 719 /* Strip off Ethernet header. */ 720 m_adj(m, ETHER_HDR_LEN); 721 722 /* If the CRC is still on the packet, trim it off. */ 723 if (m->m_flags & M_HASFCS) { 724 m_adj(m, -ETHER_CRC_LEN); 725 m->m_flags &= ~M_HASFCS; 726 } 727 728 switch (ether_type) { 729#ifdef INET 730 case ETHERTYPE_IP: 731 if (ip_fastforward(m)) 732 return; 733 isr = NETISR_IP; 734 break; 735 736 case ETHERTYPE_ARP: 737 if (ifp->if_flags & IFF_NOARP) { 738 /* Discard packet if ARP is disabled on interface */ 739 m_freem(m); 740 return; 741 } 742 isr = NETISR_ARP; 743 break; 744#endif 745#ifdef IPX 746 case ETHERTYPE_IPX: 747 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 748 return; 749 isr = NETISR_IPX; 750 break; 751#endif 752#ifdef INET6 753 case ETHERTYPE_IPV6: 754 isr = NETISR_IPV6; 755 break; 756#endif 757#ifdef NETATALK 758 case ETHERTYPE_AT: 759 isr = NETISR_ATALK1; 760 break; 761 case ETHERTYPE_AARP: 762 isr = NETISR_AARP; 763 break; 764#endif /* NETATALK */ 765 default: 766#ifdef IPX 767 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 768 return; 769#endif /* IPX */ 770#if defined(NETATALK) 771 if (ether_type > ETHERMTU) 772 goto discard; 773 l = mtod(m, struct llc *); 774 if (l->llc_dsap == LLC_SNAP_LSAP && 775 l->llc_ssap == LLC_SNAP_LSAP && 776 l->llc_control == LLC_UI) { 777 if (Bcmp(&(l->llc_snap_org_code)[0], at_org_code, 778 sizeof(at_org_code)) == 0 && 779 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 780 m_adj(m, LLC_SNAPFRAMELEN); 781 isr = NETISR_ATALK2; 782 break; 783 } 784 if (Bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 785 sizeof(aarp_org_code)) == 0 && 786 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 787 m_adj(m, LLC_SNAPFRAMELEN); 788 isr = NETISR_AARP; 789 break; 790 } 791 } 792#endif /* NETATALK */ 793 goto discard; 794 } 795 netisr_dispatch(isr, m); 796 return; 797 798discard: 799 /* 800 * Packet is to be discarded. If netgraph is present, 801 * hand the packet to it for last chance processing; 802 * otherwise dispose of it. 803 */ 804 if (ng_ether_input_orphan_p != NULL) { 805 /* 806 * Put back the ethernet header so netgraph has a 807 * consistent view of inbound packets. 808 */ 809 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 810 (*ng_ether_input_orphan_p)(ifp, m); 811 return; 812 } 813 m_freem(m); 814} 815 816/* 817 * Convert Ethernet address to printable (loggable) representation. 818 * This routine is for compatibility; it's better to just use 819 * 820 * printf("%6D", <pointer to address>, ":"); 821 * 822 * since there's no static buffer involved. 823 */ 824char * 825ether_sprintf(const u_char *ap) 826{ 827 static char etherbuf[18]; 828 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":"); 829 return (etherbuf); 830} 831 832/* 833 * Perform common duties while attaching to interface list 834 */ 835void 836ether_ifattach(struct ifnet *ifp, const u_int8_t *llc) 837{ 838 struct ifaddr *ifa; 839 struct sockaddr_dl *sdl; 840 841 ifp->if_type = IFT_ETHER; 842 ifp->if_addrlen = ETHER_ADDR_LEN; 843 ifp->if_hdrlen = ETHER_HDR_LEN; 844 if_attach(ifp); 845 ifp->if_mtu = ETHERMTU; 846 ifp->if_output = ether_output; 847 ifp->if_input = ether_input; 848 ifp->if_resolvemulti = ether_resolvemulti; 849 if (ifp->if_baudrate == 0) 850 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 851 ifp->if_broadcastaddr = etherbroadcastaddr; 852 853 ifa = ifaddr_byindex(ifp->if_index); 854 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__)); 855 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 856 sdl->sdl_type = IFT_ETHER; 857 sdl->sdl_alen = ifp->if_addrlen; 858 bcopy(llc, LLADDR(sdl), ifp->if_addrlen); 859 /* 860 * XXX: This doesn't belong here; we do it until 861 * XXX: all drivers are cleaned up 862 */ 863 if (llc != IFP2AC(ifp)->ac_enaddr) 864 bcopy(llc, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 865 866 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 867 if (ng_ether_attach_p != NULL) 868 (*ng_ether_attach_p)(ifp); 869 if (BDG_LOADED) 870 bdgtakeifaces_ptr(); 871} 872 873/* 874 * Perform common duties while detaching an Ethernet interface 875 */ 876void 877ether_ifdetach(struct ifnet *ifp) 878{ 879 if (ng_ether_detach_p != NULL) 880 (*ng_ether_detach_p)(ifp); 881 bpfdetach(ifp); 882 if_detach(ifp); 883 if (BDG_LOADED) 884 bdgtakeifaces_ptr(); 885} 886 887SYSCTL_DECL(_net_link); 888SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 889SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 890 ðer_ipfw,0,"Pass ether pkts through firewall"); 891 892int 893ether_ioctl(struct ifnet *ifp, int command, caddr_t data) 894{ 895 struct ifaddr *ifa = (struct ifaddr *) data; 896 struct ifreq *ifr = (struct ifreq *) data; 897 int error = 0; 898 899 switch (command) { 900 case SIOCSIFADDR: 901 ifp->if_flags |= IFF_UP; 902 903 switch (ifa->ifa_addr->sa_family) { 904#ifdef INET 905 case AF_INET: 906 ifp->if_init(ifp->if_softc); /* before arpwhohas */ 907 arp_ifinit(ifp, ifa); 908 break; 909#endif 910#ifdef IPX 911 /* 912 * XXX - This code is probably wrong 913 */ 914 case AF_IPX: 915 { 916 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); 917 struct arpcom *ac = IFP2AC(ifp); 918 919 if (ipx_nullhost(*ina)) 920 ina->x_host = 921 *(union ipx_host *) 922 ac->ac_enaddr; 923 else { 924 bcopy((caddr_t) ina->x_host.c_host, 925 (caddr_t) ac->ac_enaddr, 926 sizeof(ac->ac_enaddr)); 927 } 928 929 /* 930 * Set new address 931 */ 932 ifp->if_init(ifp->if_softc); 933 break; 934 } 935#endif 936 default: 937 ifp->if_init(ifp->if_softc); 938 break; 939 } 940 break; 941 942 case SIOCGIFADDR: 943 { 944 struct sockaddr *sa; 945 946 sa = (struct sockaddr *) & ifr->ifr_data; 947 bcopy(IFP2AC(ifp)->ac_enaddr, 948 (caddr_t) sa->sa_data, ETHER_ADDR_LEN); 949 } 950 break; 951 952 case SIOCSIFMTU: 953 /* 954 * Set the interface MTU. 955 */ 956 if (ifr->ifr_mtu > ETHERMTU) { 957 error = EINVAL; 958 } else { 959 ifp->if_mtu = ifr->ifr_mtu; 960 } 961 break; 962 default: 963 error = EINVAL; /* XXX netbsd has ENOTTY??? */ 964 break; 965 } 966 return (error); 967} 968 969static int 970ether_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa, 971 struct sockaddr *sa) 972{ 973 struct sockaddr_dl *sdl; 974 struct sockaddr_in *sin; 975#ifdef INET6 976 struct sockaddr_in6 *sin6; 977#endif 978 u_char *e_addr; 979 980 switch(sa->sa_family) { 981 case AF_LINK: 982 /* 983 * No mapping needed. Just check that it's a valid MC address. 984 */ 985 sdl = (struct sockaddr_dl *)sa; 986 e_addr = LLADDR(sdl); 987 if ((e_addr[0] & 1) != 1) 988 return EADDRNOTAVAIL; 989 *llsa = 0; 990 return 0; 991 992#ifdef INET 993 case AF_INET: 994 sin = (struct sockaddr_in *)sa; 995 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 996 return EADDRNOTAVAIL; 997 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 998 M_WAITOK|M_ZERO); 999 sdl->sdl_len = sizeof *sdl; 1000 sdl->sdl_family = AF_LINK; 1001 sdl->sdl_index = ifp->if_index; 1002 sdl->sdl_type = IFT_ETHER; 1003 sdl->sdl_alen = ETHER_ADDR_LEN; 1004 e_addr = LLADDR(sdl); 1005 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 1006 *llsa = (struct sockaddr *)sdl; 1007 return 0; 1008#endif 1009#ifdef INET6 1010 case AF_INET6: 1011 sin6 = (struct sockaddr_in6 *)sa; 1012 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1013 /* 1014 * An IP6 address of 0 means listen to all 1015 * of the Ethernet multicast address used for IP6. 1016 * (This is used for multicast routers.) 1017 */ 1018 ifp->if_flags |= IFF_ALLMULTI; 1019 *llsa = 0; 1020 return 0; 1021 } 1022 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1023 return EADDRNOTAVAIL; 1024 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1025 M_WAITOK|M_ZERO); 1026 sdl->sdl_len = sizeof *sdl; 1027 sdl->sdl_family = AF_LINK; 1028 sdl->sdl_index = ifp->if_index; 1029 sdl->sdl_type = IFT_ETHER; 1030 sdl->sdl_alen = ETHER_ADDR_LEN; 1031 e_addr = LLADDR(sdl); 1032 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1033 *llsa = (struct sockaddr *)sdl; 1034 return 0; 1035#endif 1036 1037 default: 1038 /* 1039 * Well, the text isn't quite right, but it's the name 1040 * that counts... 1041 */ 1042 return EAFNOSUPPORT; 1043 } 1044} 1045 1046static moduledata_t ether_mod = { 1047 "ether", 1048 NULL, 1049 0 1050}; 1051 1052DECLARE_MODULE(ether, ether_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1053MODULE_VERSION(ether, 1); 1054