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