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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 * 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: releng/5.1/sys/net/if_ethersubr.c 114723 2003-05-05 09:15:50Z obrien $ 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 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 216 llc.llc_control = LLC_UI; 217 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); 218 llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); 219 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN); 220 type = htons(m->m_pkthdr.len); 221 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN; 222 } else { 223 type = htons(ETHERTYPE_AT); 224 } 225 break; 226 } 227 #endif /* NETATALK */ 228 229 case pseudo_AF_HDRCMPLT: 230 hdrcmplt = 1; 231 eh = (struct ether_header *)dst->sa_data; 232 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); 233 /* FALLTHROUGH */ 234 235 case AF_UNSPEC: 236 loop_copy = -1; /* if this is for us, don't do it */ 237 eh = (struct ether_header *)dst->sa_data; 238 (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); 239 type = eh->ether_type; 240 break; 241 242 default: 243 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 244 senderr(EAFNOSUPPORT); 245 } 246 247 /* 248 * Add local net header. If no space in first mbuf, 249 * allocate another. 250 */ 251 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 252 if (m == 0) 253 senderr(ENOBUFS); 254 eh = mtod(m, struct ether_header *); 255 (void)memcpy(&eh->ether_type, &type, 256 sizeof(eh->ether_type)); 257 (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); 258 if (hdrcmplt) 259 (void)memcpy(eh->ether_shost, esrc, 260 sizeof(eh->ether_shost)); 261 else 262 (void)memcpy(eh->ether_shost, ac->ac_enaddr, 263 sizeof(eh->ether_shost)); 264 265 /* 266 * If a simplex interface, and the packet is being sent to our 267 * Ethernet address or a broadcast address, loopback a copy. 268 * XXX To make a simplex device behave exactly like a duplex 269 * device, we should copy in the case of sending to our own 270 * ethernet address (thus letting the original actually appear 271 * on the wire). However, we don't do that here for security 272 * reasons and compatibility with the original behavior. 273 */ 274 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 275 int csum_flags = 0; 276 277 if (m->m_pkthdr.csum_flags & CSUM_IP) 278 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID); 279 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 280 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 281 282 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 283 struct mbuf *n; 284 285 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 286 n->m_pkthdr.csum_flags |= csum_flags; 287 if (csum_flags & CSUM_DATA_VALID) 288 n->m_pkthdr.csum_data = 0xffff; 289 (void)if_simloop(ifp, n, dst->sa_family, hlen); 290 } else 291 ifp->if_iqdrops++; 292 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 293 ETHER_ADDR_LEN) == 0) { 294 m->m_pkthdr.csum_flags |= csum_flags; 295 if (csum_flags & CSUM_DATA_VALID) 296 m->m_pkthdr.csum_data = 0xffff; 297 (void) if_simloop(ifp, m, dst->sa_family, hlen); 298 return (0); /* XXX */ 299 } 300 } 301 302 /* Handle ng_ether(4) processing, if any */ 303 if (ng_ether_output_p != NULL) { 304 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) { 305 bad: if (m != NULL) 306 m_freem(m); 307 return (error); 308 } 309 if (m == NULL) 310 return (0); 311 } 312 313 /* Continue with link-layer output */ 314 return ether_output_frame(ifp, m); 315 } 316 317 /* 318 * Ethernet link layer output routine to send a raw frame to the device. 319 * 320 * This assumes that the 14 byte Ethernet header is present and contiguous 321 * in the first mbuf (if BRIDGE'ing). 322 */ 323 int 324 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 325 { 326 struct ip_fw *rule = NULL; 327 328 /* Extract info from dummynet tag, ignore others */ 329 for (; m->m_type == MT_TAG; m = m->m_next) 330 if (m->m_flags == PACKET_TAG_DUMMYNET) 331 rule = ((struct dn_pkt *)m)->rule; 332 333 if (rule == NULL && BDG_ACTIVE(ifp)) { 334 /* 335 * Beware, the bridge code notices the null rcvif and 336 * uses that identify that it's being called from 337 * ether_output as opposd to ether_input. Yech. 338 */ 339 m->m_pkthdr.rcvif = NULL; 340 m = bdg_forward_ptr(m, ifp); 341 if (m != NULL) 342 m_freem(m); 343 return (0); 344 } 345 if (IPFW_LOADED && ether_ipfw != 0) { 346 if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) { 347 if (m) { 348 m_freem(m); 349 return ENOBUFS; /* pkt dropped */ 350 } else 351 return 0; /* consumed e.g. in a pipe */ 352 } 353 } 354 355 /* 356 * Queue message on interface, update output statistics if 357 * successful, and start output if interface not yet active. 358 */ 359 return (IF_HANDOFF(&ifp->if_snd, m, ifp) ? 0 : ENOBUFS); 360 } 361 362 /* 363 * ipfw processing for ethernet packets (in and out). 364 * The second parameter is NULL from ether_demux, and ifp from 365 * ether_output_frame. This section of code could be used from 366 * bridge.c as well as long as we use some extra info 367 * to distinguish that case from ether_output_frame(); 368 */ 369 int 370 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 371 struct ip_fw **rule, int shared) 372 { 373 struct ether_header *eh; 374 struct ether_header save_eh; 375 struct mbuf *m; 376 int i; 377 struct ip_fw_args args; 378 379 if (*rule != NULL && fw_one_pass) 380 return 1; /* dummynet packet, already partially processed */ 381 382 /* 383 * I need some amt of data to be contiguous, and in case others need 384 * the packet (shared==1) also better be in the first mbuf. 385 */ 386 m = *m0; 387 i = min( m->m_pkthdr.len, max_protohdr); 388 if ( shared || m->m_len < i) { 389 m = m_pullup(m, i); 390 if (m == NULL) { 391 *m0 = m; 392 return 0; 393 } 394 } 395 eh = mtod(m, struct ether_header *); 396 save_eh = *eh; /* save copy for restore below */ 397 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */ 398 399 args.m = m; /* the packet we are looking at */ 400 args.oif = dst; /* destination, if any */ 401 args.divert_rule = 0; /* we do not support divert yet */ 402 args.rule = *rule; /* matching rule to restart */ 403 args.next_hop = NULL; /* we do not support forward yet */ 404 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 405 i = ip_fw_chk_ptr(&args); 406 m = args.m; 407 if (m != NULL) { 408 /* 409 * Restore Ethernet header, as needed, in case the 410 * mbuf chain was replaced by ipfw. 411 */ 412 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 413 if (m == NULL) { 414 *m0 = m; 415 return 0; 416 } 417 if (eh != mtod(m, struct ether_header *)) 418 bcopy(&save_eh, mtod(m, struct ether_header *), 419 ETHER_HDR_LEN); 420 } 421 *m0 = m; 422 *rule = args.rule; 423 424 if ( (i & IP_FW_PORT_DENY_FLAG) || m == NULL) /* drop */ 425 return 0; 426 427 if (i == 0) /* a PASS rule. */ 428 return 1; 429 430 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) { 431 /* 432 * Pass the pkt to dummynet, which consumes it. 433 * If shared, make a copy and keep the original. 434 */ 435 if (shared) { 436 m = m_copypacket(m, M_DONTWAIT); 437 if (m == NULL) 438 return 0; 439 } else { 440 /* 441 * Pass the original to dummynet and 442 * nothing back to the caller 443 */ 444 *m0 = NULL ; 445 } 446 ip_dn_io_ptr(m, (i & 0xffff), 447 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 448 return 0; 449 } 450 /* 451 * XXX at some point add support for divert/forward actions. 452 * If none of the above matches, we have to drop the pkt. 453 */ 454 return 0; 455 } 456 457 /* 458 * Process a received Ethernet packet; the packet is in the 459 * mbuf chain m with the ethernet header at the front. 460 */ 461 static void 462 ether_input(struct ifnet *ifp, struct mbuf *m) 463 { 464 struct ether_header *eh; 465 u_short etype; 466 467 /* 468 * Do consistency checks to verify assumptions 469 * made by code past this point. 470 */ 471 if ((m->m_flags & M_PKTHDR) == 0) { 472 if_printf(ifp, "discard frame w/o packet header\n"); 473 ifp->if_ierrors++; 474 m_freem(m); 475 return; 476 } 477 if (m->m_len < ETHER_HDR_LEN) { 478 /* XXX maybe should pullup? */ 479 if_printf(ifp, "discard frame w/o leading ethernet " 480 "header (len %u pkt len %u)\n", 481 m->m_len, m->m_pkthdr.len); 482 ifp->if_ierrors++; 483 m_freem(m); 484 return; 485 } 486 eh = mtod(m, struct ether_header *); 487 etype = ntohs(eh->ether_type); 488 if (m->m_pkthdr.len > 489 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 490 if_printf(ifp, "discard oversize frame " 491 "(ether type %x flags %x len %u > max %lu)\n", 492 etype, m->m_flags, m->m_pkthdr.len, 493 ETHER_MAX_FRAME(ifp, etype, 494 m->m_flags & M_HASFCS)); 495 ifp->if_ierrors++; 496 m_freem(m); 497 return; 498 } 499 if (m->m_pkthdr.rcvif == NULL) { 500 if_printf(ifp, "discard frame w/o interface pointer\n"); 501 ifp->if_ierrors++; 502 m_freem(m); 503 return; 504 } 505 #ifdef DIAGNOSTIC 506 if (m->m_pkthdr.rcvif != ifp) { 507 if_printf(ifp, "Warning, frame marked as received on %s%u\n", 508 m->m_pkthdr.rcvif->if_name, 509 m->m_pkthdr.rcvif->if_unit); 510 } 511 #endif 512 513 /* 514 * Give bpf a chance at the packet. 515 */ 516 BPF_MTAP(ifp, m); 517 518 if (ifp->if_flags & IFF_MONITOR) { 519 /* 520 * Interface marked for monitoring; discard packet. 521 */ 522 m_freem(m); 523 return; 524 } 525 526 /* If the CRC is still on the packet, trim it off. */ 527 if (m->m_flags & M_HASFCS) { 528 m_adj(m, -ETHER_CRC_LEN); 529 m->m_flags &= ~M_HASFCS; 530 } 531 532 #ifdef MAC 533 mac_create_mbuf_from_ifnet(ifp, m); 534 #endif 535 536 ifp->if_ibytes += m->m_pkthdr.len; 537 538 /* Handle ng_ether(4) processing, if any */ 539 if (ng_ether_input_p != NULL) { 540 (*ng_ether_input_p)(ifp, &m); 541 if (m == NULL) 542 return; 543 } 544 545 /* Check for bridging mode */ 546 if (BDG_ACTIVE(ifp) ) { 547 struct ifnet *bif; 548 549 /* 550 * Check with bridging code to see how the packet 551 * should be handled. Possibilities are: 552 * 553 * BDG_BCAST broadcast 554 * BDG_MCAST multicast 555 * BDG_LOCAL for local address, don't forward 556 * BDG_DROP discard 557 * ifp forward only to specified interface(s) 558 * 559 * Non-local destinations are handled by passing the 560 * packet back to the bridge code. 561 */ 562 bif = bridge_in_ptr(ifp, eh); 563 if (bif == BDG_DROP) { /* discard packet */ 564 m_freem(m); 565 return; 566 } 567 if (bif != BDG_LOCAL) { /* non-local, forward */ 568 m = bdg_forward_ptr(m, bif); 569 /* 570 * The bridge may consume the packet if it's not 571 * supposed to be passed up or if a problem occurred 572 * while doing its job. This is reflected by it 573 * returning a NULL mbuf pointer. 574 */ 575 if (m == NULL) { 576 if (bif == BDG_BCAST || bif == BDG_MCAST) 577 if_printf(ifp, 578 "bridge dropped %s packet\n", 579 bif == BDG_BCAST ? "broadcast" : 580 "multicast"); 581 return; 582 } 583 /* 584 * But in some cases the bridge may return the 585 * packet for us to free; sigh. 586 */ 587 if (bif != BDG_BCAST && bif != BDG_MCAST) { 588 m_freem(m); 589 return; 590 } 591 } 592 } 593 594 ether_demux(ifp, m); 595 /* First chunk of an mbuf contains good entropy */ 596 if (harvest.ethernet) 597 random_harvest(m, 16, 3, 0, RANDOM_NET); 598 } 599 600 /* 601 * Upper layer processing for a received Ethernet packet. 602 */ 603 void 604 ether_demux(struct ifnet *ifp, struct mbuf *m) 605 { 606 struct ether_header *eh; 607 int isr; 608 u_short ether_type; 609 #if defined(NETATALK) 610 struct llc *l; 611 #endif 612 struct ip_fw *rule = NULL; 613 614 /* Extract info from dummynet tag, ignore others */ 615 for (;m->m_type == MT_TAG; m = m->m_next) 616 if (m->m_flags == PACKET_TAG_DUMMYNET) { 617 rule = ((struct dn_pkt *)m)->rule; 618 ifp = m->m_next->m_pkthdr.rcvif; 619 } 620 621 KASSERT(ifp != NULL, ("ether_demux: NULL interface pointer")); 622 623 eh = mtod(m, struct ether_header *); 624 625 if (rule) /* packet was already bridged */ 626 goto post_stats; 627 628 if (!(BDG_ACTIVE(ifp))) { 629 /* 630 * Discard packet if upper layers shouldn't see it because it 631 * was unicast to a different Ethernet address. If the driver 632 * is working properly, then this situation can only happen 633 * when the interface is in promiscuous mode. 634 */ 635 if ((ifp->if_flags & IFF_PROMISC) != 0 636 && (eh->ether_dhost[0] & 1) == 0 637 && bcmp(eh->ether_dhost, 638 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0 639 && (ifp->if_flags & IFF_PPROMISC) == 0) { 640 m_freem(m); 641 return; 642 } 643 } 644 645 /* Discard packet if interface is not up */ 646 if ((ifp->if_flags & IFF_UP) == 0) { 647 m_freem(m); 648 return; 649 } 650 if (eh->ether_dhost[0] & 1) { 651 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 652 sizeof(etherbroadcastaddr)) == 0) 653 m->m_flags |= M_BCAST; 654 else 655 m->m_flags |= M_MCAST; 656 } 657 if (m->m_flags & (M_BCAST|M_MCAST)) 658 ifp->if_imcasts++; 659 660 post_stats: 661 if (IPFW_LOADED && ether_ipfw != 0) { 662 if (ether_ipfw_chk(&m, NULL, &rule, 0) == 0) { 663 if (m) 664 m_freem(m); 665 return; 666 } 667 } 668 669 /* 670 * If VLANs are configured on the interface, check to 671 * see if the device performed the decapsulation and 672 * provided us with the tag. 673 */ 674 if (ifp->if_nvlans && 675 m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL) != NULL) { 676 /* 677 * vlan_input() will either recursively call ether_input() 678 * or drop the packet. 679 */ 680 KASSERT(vlan_input_p != NULL,("ether_input: VLAN not loaded!")); 681 (*vlan_input_p)(ifp, m); 682 return; 683 } 684 685 ether_type = ntohs(eh->ether_type); 686 687 /* 688 * Handle protocols that expect to have the Ethernet header 689 * (and possibly FCS) intact. 690 */ 691 switch (ether_type) { 692 case ETHERTYPE_VLAN: 693 if (ifp->if_nvlans != 0) { 694 KASSERT(vlan_input_p,("ether_input: VLAN not loaded!")); 695 (*vlan_input_p)(ifp, m); 696 } else { 697 ifp->if_noproto++; 698 m_freem(m); 699 } 700 return; 701 } 702 703 /* Strip off Ethernet header. */ 704 m_adj(m, ETHER_HDR_LEN); 705 706 /* If the CRC is still on the packet, trim it off. */ 707 if (m->m_flags & M_HASFCS) { 708 m_adj(m, -ETHER_CRC_LEN); 709 m->m_flags &= ~M_HASFCS; 710 } 711 712 switch (ether_type) { 713 #ifdef INET 714 case ETHERTYPE_IP: 715 if (ipflow_fastforward(m)) 716 return; 717 isr = NETISR_IP; 718 break; 719 720 case ETHERTYPE_ARP: 721 if (ifp->if_flags & IFF_NOARP) { 722 /* Discard packet if ARP is disabled on interface */ 723 m_freem(m); 724 return; 725 } 726 isr = NETISR_ARP; 727 break; 728 #endif 729 #ifdef IPX 730 case ETHERTYPE_IPX: 731 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 732 return; 733 isr = NETISR_IPX; 734 break; 735 #endif 736 #ifdef INET6 737 case ETHERTYPE_IPV6: 738 isr = NETISR_IPV6; 739 break; 740 #endif 741 #ifdef NETATALK 742 case ETHERTYPE_AT: 743 isr = NETISR_ATALK1; 744 break; 745 case ETHERTYPE_AARP: 746 isr = NETISR_AARP; 747 break; 748 #endif /* NETATALK */ 749 default: 750 #ifdef IPX 751 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 752 return; 753 #endif /* IPX */ 754 #if defined(NETATALK) 755 if (ether_type > ETHERMTU) 756 goto discard; 757 l = mtod(m, struct llc *); 758 if (l->llc_dsap == LLC_SNAP_LSAP && 759 l->llc_ssap == LLC_SNAP_LSAP && 760 l->llc_control == LLC_UI) { 761 if (Bcmp(&(l->llc_snap_org_code)[0], at_org_code, 762 sizeof(at_org_code)) == 0 && 763 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 764 m_adj(m, LLC_SNAPFRAMELEN); 765 isr = NETISR_ATALK2; 766 break; 767 } 768 if (Bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 769 sizeof(aarp_org_code)) == 0 && 770 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 771 m_adj(m, LLC_SNAPFRAMELEN); 772 isr = NETISR_AARP; 773 break; 774 } 775 } 776 #endif /* NETATALK */ 777 goto discard; 778 } 779 netisr_dispatch(isr, m); 780 return; 781 782 discard: 783 /* 784 * Packet is to be discarded. If netgraph is present, 785 * hand the packet to it for last chance processing; 786 * otherwise dispose of it. 787 */ 788 if (ng_ether_input_orphan_p != NULL) { 789 /* 790 * Put back the ethernet header so netgraph has a 791 * consistent view of inbound packets. 792 */ 793 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 794 (*ng_ether_input_orphan_p)(ifp, m); 795 return; 796 } 797 m_freem(m); 798 } 799 800 /* 801 * Convert Ethernet address to printable (loggable) representation. 802 * This routine is for compatibility; it's better to just use 803 * 804 * printf("%6D", <pointer to address>, ":"); 805 * 806 * since there's no static buffer involved. 807 */ 808 char * 809 ether_sprintf(const u_char *ap) 810 { 811 static char etherbuf[18]; 812 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":"); 813 return (etherbuf); 814 } 815 816 /* 817 * Perform common duties while attaching to interface list 818 */ 819 void 820 ether_ifattach(struct ifnet *ifp, const u_int8_t *llc) 821 { 822 struct ifaddr *ifa; 823 struct sockaddr_dl *sdl; 824 825 ifp->if_type = IFT_ETHER; 826 ifp->if_addrlen = ETHER_ADDR_LEN; 827 ifp->if_hdrlen = ETHER_HDR_LEN; 828 if_attach(ifp); 829 ifp->if_mtu = ETHERMTU; 830 ifp->if_output = ether_output; 831 ifp->if_input = ether_input; 832 ifp->if_resolvemulti = ether_resolvemulti; 833 if (ifp->if_baudrate == 0) 834 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 835 ifp->if_broadcastaddr = etherbroadcastaddr; 836 837 ifa = ifaddr_byindex(ifp->if_index); 838 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__)); 839 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 840 sdl->sdl_type = IFT_ETHER; 841 sdl->sdl_alen = ifp->if_addrlen; 842 bcopy(llc, LLADDR(sdl), ifp->if_addrlen); 843 /* 844 * XXX: This doesn't belong here; we do it until 845 * XXX: all drivers are cleaned up 846 */ 847 if (llc != IFP2AC(ifp)->ac_enaddr) 848 bcopy(llc, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 849 850 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 851 if (ng_ether_attach_p != NULL) 852 (*ng_ether_attach_p)(ifp); 853 if (BDG_LOADED) 854 bdgtakeifaces_ptr(); 855 } 856 857 /* 858 * Perform common duties while detaching an Ethernet interface 859 */ 860 void 861 ether_ifdetach(struct ifnet *ifp) 862 { 863 if (ng_ether_detach_p != NULL) 864 (*ng_ether_detach_p)(ifp); 865 bpfdetach(ifp); 866 if_detach(ifp); 867 if (BDG_LOADED) 868 bdgtakeifaces_ptr(); 869 } 870 871 SYSCTL_DECL(_net_link); 872 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 873 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 874 ðer_ipfw,0,"Pass ether pkts through firewall"); 875 876 int 877 ether_ioctl(ifp, command, data) 878 struct ifnet *ifp; 879 int command; 880 caddr_t data; 881 { 882 struct ifaddr *ifa = (struct ifaddr *) data; 883 struct ifreq *ifr = (struct ifreq *) data; 884 int error = 0; 885 886 switch (command) { 887 case SIOCSIFADDR: 888 ifp->if_flags |= IFF_UP; 889 890 switch (ifa->ifa_addr->sa_family) { 891 #ifdef INET 892 case AF_INET: 893 ifp->if_init(ifp->if_softc); /* before arpwhohas */ 894 arp_ifinit(ifp, ifa); 895 break; 896 #endif 897 #ifdef IPX 898 /* 899 * XXX - This code is probably wrong 900 */ 901 case AF_IPX: 902 { 903 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); 904 struct arpcom *ac = IFP2AC(ifp); 905 906 if (ipx_nullhost(*ina)) 907 ina->x_host = 908 *(union ipx_host *) 909 ac->ac_enaddr; 910 else { 911 bcopy((caddr_t) ina->x_host.c_host, 912 (caddr_t) ac->ac_enaddr, 913 sizeof(ac->ac_enaddr)); 914 } 915 916 /* 917 * Set new address 918 */ 919 ifp->if_init(ifp->if_softc); 920 break; 921 } 922 #endif 923 default: 924 ifp->if_init(ifp->if_softc); 925 break; 926 } 927 break; 928 929 case SIOCGIFADDR: 930 { 931 struct sockaddr *sa; 932 933 sa = (struct sockaddr *) & ifr->ifr_data; 934 bcopy(IFP2AC(ifp)->ac_enaddr, 935 (caddr_t) sa->sa_data, ETHER_ADDR_LEN); 936 } 937 break; 938 939 case SIOCSIFMTU: 940 /* 941 * Set the interface MTU. 942 */ 943 if (ifr->ifr_mtu > ETHERMTU) { 944 error = EINVAL; 945 } else { 946 ifp->if_mtu = ifr->ifr_mtu; 947 } 948 break; 949 default: 950 error = EINVAL; /* XXX netbsd has ENOTTY??? */ 951 break; 952 } 953 return (error); 954 } 955 956 static int 957 ether_resolvemulti(ifp, llsa, sa) 958 struct ifnet *ifp; 959 struct sockaddr **llsa; 960 struct sockaddr *sa; 961 { 962 struct sockaddr_dl *sdl; 963 struct sockaddr_in *sin; 964 #ifdef INET6 965 struct sockaddr_in6 *sin6; 966 #endif 967 u_char *e_addr; 968 969 switch(sa->sa_family) { 970 case AF_LINK: 971 /* 972 * No mapping needed. Just check that it's a valid MC address. 973 */ 974 sdl = (struct sockaddr_dl *)sa; 975 e_addr = LLADDR(sdl); 976 if ((e_addr[0] & 1) != 1) 977 return EADDRNOTAVAIL; 978 *llsa = 0; 979 return 0; 980 981 #ifdef INET 982 case AF_INET: 983 sin = (struct sockaddr_in *)sa; 984 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 985 return EADDRNOTAVAIL; 986 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 987 M_WAITOK|M_ZERO); 988 sdl->sdl_len = sizeof *sdl; 989 sdl->sdl_family = AF_LINK; 990 sdl->sdl_index = ifp->if_index; 991 sdl->sdl_type = IFT_ETHER; 992 sdl->sdl_alen = ETHER_ADDR_LEN; 993 e_addr = LLADDR(sdl); 994 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 995 *llsa = (struct sockaddr *)sdl; 996 return 0; 997 #endif 998 #ifdef INET6 999 case AF_INET6: 1000 sin6 = (struct sockaddr_in6 *)sa; 1001 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1002 /* 1003 * An IP6 address of 0 means listen to all 1004 * of the Ethernet multicast address used for IP6. 1005 * (This is used for multicast routers.) 1006 */ 1007 ifp->if_flags |= IFF_ALLMULTI; 1008 *llsa = 0; 1009 return 0; 1010 } 1011 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1012 return EADDRNOTAVAIL; 1013 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1014 M_WAITOK|M_ZERO); 1015 sdl->sdl_len = sizeof *sdl; 1016 sdl->sdl_family = AF_LINK; 1017 sdl->sdl_index = ifp->if_index; 1018 sdl->sdl_type = IFT_ETHER; 1019 sdl->sdl_alen = ETHER_ADDR_LEN; 1020 e_addr = LLADDR(sdl); 1021 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1022 *llsa = (struct sockaddr *)sdl; 1023 return 0; 1024 #endif 1025 1026 default: 1027 /* 1028 * Well, the text isn't quite right, but it's the name 1029 * that counts... 1030 */ 1031 return EAFNOSUPPORT; 1032 } 1033 } 1034 1035 static moduledata_t ether_mod = { 1036 "ether", 1037 NULL, 1038 0 1039 }; 1040 1041 DECLARE_MODULE(ether, ether_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1042 MODULE_VERSION(ether, 1);
Cache object: ca2e959c804e8fdaaf5aa89d6bc1efec
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