if_ethersubr.c revision 112269
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 112269 2003-03-15 15:38:02Z 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 int ether_resolvemulti(struct ifnet *, struct sockaddr **, 115 struct sockaddr *); 116u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 117#define senderr(e) do { error = (e); goto bad;} while (0) 118#define IFP2AC(IFP) ((struct arpcom *)IFP) 119 120int 121ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 122 struct ip_fw **rule, int shared); 123static int ether_ipfw; 124 125/* 126 * Ethernet output routine. 127 * Encapsulate a packet of type family for the local net. 128 * Use trailer local net encapsulation if enough data in first 129 * packet leaves a multiple of 512 bytes of data in remainder. 130 * Assumes that ifp is actually pointer to arpcom structure. 131 */ 132int 133ether_output(ifp, m, dst, rt0) 134 struct ifnet *ifp; 135 struct mbuf *m; 136 struct sockaddr *dst; 137 struct rtentry *rt0; 138{ 139 short type; 140 int error = 0, hdrcmplt = 0; 141 u_char esrc[6], edst[6]; 142 struct rtentry *rt; 143 struct ether_header *eh; 144 int loop_copy = 0; 145 int hlen; /* link layer header lenght */ 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#endif 172#ifdef INET6 173 case AF_INET6: 174 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) { 175 /* Something bad happened */ 176 return(0); 177 } 178 type = htons(ETHERTYPE_IPV6); 179 break; 180#endif 181#ifdef IPX 182 case AF_IPX: 183 if (ef_outputp) { 184 error = ef_outputp(ifp, &m, dst, &type, &hlen); 185 if (error) 186 goto bad; 187 } else 188 type = htons(ETHERTYPE_IPX); 189 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 190 (caddr_t)edst, sizeof (edst)); 191 break; 192#endif 193#ifdef NETATALK 194 case AF_APPLETALK: 195 { 196 struct at_ifaddr *aa; 197 198 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { 199 goto bad; 200 } 201 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) 202 return (0); 203 /* 204 * In the phase 2 case, need to prepend an mbuf for the llc header. 205 * Since we must preserve the value of m, which is passed to us by 206 * value, we m_copy() the first mbuf, and use it for our llc header. 207 */ 208 if ( aa->aa_flags & AFA_PHASE2 ) { 209 struct llc llc; 210 211 M_PREPEND(m, LLC_SNAPFRAMELEN, M_TRYWAIT); 212 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 213 llc.llc_control = LLC_UI; 214 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); 215 llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); 216 bcopy(&llc, mtod(m, caddr_t), LLC_SNAPFRAMELEN); 217 type = htons(m->m_pkthdr.len); 218 hlen = LLC_SNAPFRAMELEN + ETHER_HDR_LEN; 219 } else { 220 type = htons(ETHERTYPE_AT); 221 } 222 break; 223 } 224#endif /* NETATALK */ 225 226 case pseudo_AF_HDRCMPLT: 227 hdrcmplt = 1; 228 eh = (struct ether_header *)dst->sa_data; 229 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); 230 /* FALLTHROUGH */ 231 232 case AF_UNSPEC: 233 loop_copy = -1; /* if this is for us, don't do it */ 234 eh = (struct ether_header *)dst->sa_data; 235 (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); 236 type = eh->ether_type; 237 break; 238 239 default: 240 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 241 senderr(EAFNOSUPPORT); 242 } 243 244 /* 245 * Add local net header. If no space in first mbuf, 246 * allocate another. 247 */ 248 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 249 if (m == 0) 250 senderr(ENOBUFS); 251 eh = mtod(m, struct ether_header *); 252 (void)memcpy(&eh->ether_type, &type, 253 sizeof(eh->ether_type)); 254 (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); 255 if (hdrcmplt) 256 (void)memcpy(eh->ether_shost, esrc, 257 sizeof(eh->ether_shost)); 258 else 259 (void)memcpy(eh->ether_shost, ac->ac_enaddr, 260 sizeof(eh->ether_shost)); 261 262 /* 263 * If a simplex interface, and the packet is being sent to our 264 * Ethernet address or a broadcast address, loopback a copy. 265 * XXX To make a simplex device behave exactly like a duplex 266 * device, we should copy in the case of sending to our own 267 * ethernet address (thus letting the original actually appear 268 * on the wire). However, we don't do that here for security 269 * reasons and compatibility with the original behavior. 270 */ 271 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 272 int csum_flags = 0; 273 274 if (m->m_pkthdr.csum_flags & CSUM_IP) 275 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID); 276 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 277 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 278 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 279 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 280 281 n->m_pkthdr.csum_flags |= csum_flags; 282 if (csum_flags & CSUM_DATA_VALID) 283 n->m_pkthdr.csum_data = 0xffff; 284 285 (void) if_simloop(ifp, n, dst->sa_family, hlen); 286 } else if (bcmp(eh->ether_dhost, 287 eh->ether_shost, ETHER_ADDR_LEN) == 0) { 288 m->m_pkthdr.csum_flags |= csum_flags; 289 if (csum_flags & CSUM_DATA_VALID) 290 m->m_pkthdr.csum_data = 0xffff; 291 (void) if_simloop(ifp, m, dst->sa_family, hlen); 292 return (0); /* XXX */ 293 } 294 } 295 296 /* Handle ng_ether(4) processing, if any */ 297 if (ng_ether_output_p != NULL) { 298 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) { 299bad: if (m != NULL) 300 m_freem(m); 301 return (error); 302 } 303 if (m == NULL) 304 return (0); 305 } 306 307 /* Continue with link-layer output */ 308 return ether_output_frame(ifp, m); 309} 310 311/* 312 * Ethernet link layer output routine to send a raw frame to the device. 313 * 314 * This assumes that the 14 byte Ethernet header is present and contiguous 315 * in the first mbuf (if BRIDGE'ing). 316 */ 317int 318ether_output_frame(struct ifnet *ifp, struct mbuf *m) 319{ 320 struct ip_fw *rule = NULL; 321 322 /* Extract info from dummynet tag, ignore others */ 323 for (; m->m_type == MT_TAG; m = m->m_next) 324 if (m->m_flags == PACKET_TAG_DUMMYNET) 325 rule = ((struct dn_pkt *)m)->rule; 326 327 if (rule == NULL && BDG_ACTIVE(ifp)) { 328 /* 329 * Beware, the bridge code notices the null rcvif and 330 * uses that identify that it's being called from 331 * ether_output as opposd to ether_input. Yech. 332 */ 333 m->m_pkthdr.rcvif = NULL; 334 m = bdg_forward_ptr(m, ifp); 335 if (m != NULL) 336 m_freem(m); 337 return (0); 338 } 339 if (IPFW_LOADED && ether_ipfw != 0) { 340 if (ether_ipfw_chk(&m, ifp, &rule, 0) == 0) { 341 if (m) { 342 m_freem(m); 343 return ENOBUFS; /* pkt dropped */ 344 } else 345 return 0; /* consumed e.g. in a pipe */ 346 } 347 } 348 349 /* 350 * Queue message on interface, update output statistics if 351 * successful, and start output if interface not yet active. 352 */ 353 return (IF_HANDOFF(&ifp->if_snd, m, ifp) ? 0 : ENOBUFS); 354} 355 356/* 357 * ipfw processing for ethernet packets (in and out). 358 * The second parameter is NULL from ether_demux, and ifp from 359 * ether_output_frame. This section of code could be used from 360 * bridge.c as well as long as we use some extra info 361 * to distinguish that case from ether_output_frame(); 362 */ 363int 364ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 365 struct ip_fw **rule, int shared) 366{ 367 struct ether_header *eh; 368 struct ether_header save_eh; 369 struct mbuf *m; 370 int i; 371 struct ip_fw_args args; 372 373 if (*rule != NULL && fw_one_pass) 374 return 1; /* dummynet packet, already partially processed */ 375 376 /* 377 * I need some amt of data to be contiguous, and in case others need 378 * the packet (shared==1) also better be in the first mbuf. 379 */ 380 m = *m0; 381 i = min( m->m_pkthdr.len, max_protohdr); 382 if ( shared || m->m_len < i) { 383 m = m_pullup(m, i); 384 if (m == NULL) { 385 *m0 = m; 386 return 0; 387 } 388 } 389 eh = mtod(m, struct ether_header *); 390 save_eh = *eh; /* save copy for restore below */ 391 m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */ 392 393 args.m = m; /* the packet we are looking at */ 394 args.oif = dst; /* destination, if any */ 395 args.divert_rule = 0; /* we do not support divert yet */ 396 args.rule = *rule; /* matching rule to restart */ 397 args.next_hop = NULL; /* we do not support forward yet */ 398 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 399 i = ip_fw_chk_ptr(&args); 400 m = args.m; 401 if (m != NULL) { 402 /* 403 * Restore Ethernet header, as needed, in case the 404 * mbuf chain was replaced by ipfw. 405 */ 406 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 407 if (m == NULL) { 408 *m0 = m; 409 return 0; 410 } 411 if (eh != mtod(m, struct ether_header *)) 412 bcopy(&save_eh, mtod(m, struct ether_header *), 413 ETHER_HDR_LEN); 414 } 415 *m0 = m; 416 *rule = args.rule; 417 418 if ( (i & IP_FW_PORT_DENY_FLAG) || m == NULL) /* drop */ 419 return 0; 420 421 if (i == 0) /* a PASS rule. */ 422 return 1; 423 424 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) { 425 /* 426 * Pass the pkt to dummynet, which consumes it. 427 * If shared, make a copy and keep the original. 428 */ 429 if (shared) { 430 m = m_copypacket(m, M_DONTWAIT); 431 if (m == NULL) 432 return 0; 433 } else { 434 /* 435 * Pass the original to dummynet and 436 * nothing back to the caller 437 */ 438 *m0 = NULL ; 439 } 440 ip_dn_io_ptr(m, (i & 0xffff), 441 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 442 return 0; 443 } 444 /* 445 * XXX at some point add support for divert/forward actions. 446 * If none of the above matches, we have to drop the pkt. 447 */ 448 return 0; 449} 450 451/* 452 * Process a received Ethernet packet; the packet is in the 453 * mbuf chain m with the ethernet header at the front. 454 */ 455static void 456ether_input(struct ifnet *ifp, struct mbuf *m) 457{ 458 struct ether_header *eh; 459 u_short etype; 460 461 /* 462 * Do consistency checks to verify assumptions 463 * made by code past this point. 464 */ 465 if ((m->m_flags & M_PKTHDR) == 0) { 466 if_printf(ifp, "discard frame w/o packet header\n"); 467 ifp->if_ierrors++; 468 m_freem(m); 469 return; 470 } 471 if (m->m_len < ETHER_HDR_LEN) { 472 /* XXX maybe should pullup? */ 473 if_printf(ifp, "discard frame w/o leading ethernet " 474 "header (len %u pkt len %u)\n", 475 m->m_len, m->m_pkthdr.len); 476 ifp->if_ierrors++; 477 m_freem(m); 478 return; 479 } 480 eh = mtod(m, struct ether_header *); 481 etype = ntohs(eh->ether_type); 482 if (m->m_pkthdr.len > 483 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 484 if_printf(ifp, "discard oversize frame " 485 "(ether type %x flags %x len %u > max %lu)\n", 486 etype, m->m_flags, m->m_pkthdr.len, 487 ETHER_MAX_FRAME(ifp, etype, 488 m->m_flags & M_HASFCS)); 489 ifp->if_ierrors++; 490 m_freem(m); 491 return; 492 } 493 if (m->m_pkthdr.rcvif == NULL) { 494 if_printf(ifp, "discard frame w/o interface pointer\n"); 495 ifp->if_ierrors++; 496 m_freem(m); 497 return; 498 } 499#ifdef DIAGNOSTIC 500 if (m->m_pkthdr.rcvif != ifp) { 501 if_printf(ifp, "Warning, frame marked as received on %s%u\n", 502 m->m_pkthdr.rcvif->if_name, 503 m->m_pkthdr.rcvif->if_unit); 504 } 505#endif 506 507 /* 508 * Give bpf a chance at the packet. 509 */ 510 BPF_MTAP(ifp, m); 511 512 if (ifp->if_flags & IFF_MONITOR) { 513 /* 514 * Interface marked for monitoring; discard packet. 515 */ 516 m_freem(m); 517 return; 518 } 519 520 /* If the CRC is still on the packet, trim it off. */ 521 if (m->m_flags & M_HASFCS) { 522 m_adj(m, -ETHER_CRC_LEN); 523 m->m_flags &= ~M_HASFCS; 524 } 525 526#ifdef MAC 527 mac_create_mbuf_from_ifnet(ifp, m); 528#endif 529 530 ifp->if_ibytes += m->m_pkthdr.len; 531 532 /* Handle ng_ether(4) processing, if any */ 533 if (ng_ether_input_p != NULL) { 534 (*ng_ether_input_p)(ifp, &m); 535 if (m == NULL) 536 return; 537 } 538 539 /* Check for bridging mode */ 540 if (BDG_ACTIVE(ifp) ) { 541 struct ifnet *bif; 542 543 /* 544 * Check with bridging code to see how the packet 545 * should be handled. Possibilities are: 546 * 547 * BDG_BCAST broadcast 548 * BDG_MCAST multicast 549 * BDG_LOCAL for local address, don't forward 550 * BDG_DROP discard 551 * ifp forward only to specified interface(s) 552 * 553 * Non-local destinations are handled by passing the 554 * packet back to the bridge code. 555 */ 556 bif = bridge_in_ptr(ifp, eh); 557 if (bif == BDG_DROP) { /* discard packet */ 558 m_freem(m); 559 return; 560 } 561 if (bif != BDG_LOCAL) { /* non-local, forward */ 562 m = bdg_forward_ptr(m, bif); 563 /* 564 * The bridge may consume the packet if it's not 565 * supposed to be passed up or if a problem occurred 566 * while doing its job. This is reflected by it 567 * returning a NULL mbuf pointer. 568 */ 569 if (m == NULL) { 570 if (bif == BDG_BCAST || bif == BDG_MCAST) 571 if_printf(ifp, 572 "bridge dropped %s packet\n", 573 bif == BDG_BCAST ? "broadcast" : 574 "multicast"); 575 return; 576 } 577 /* 578 * But in some cases the bridge may return the 579 * packet for us to free; sigh. 580 */ 581 if (bif != BDG_BCAST && bif != BDG_MCAST) { 582 m_freem(m); 583 return; 584 } 585 } 586 } 587 588 ether_demux(ifp, m); 589 /* First chunk of an mbuf contains good entropy */ 590 if (harvest.ethernet) 591 random_harvest(m, 16, 3, 0, RANDOM_NET); 592} 593 594/* 595 * Upper layer processing for a received Ethernet packet. 596 */ 597void 598ether_demux(struct ifnet *ifp, struct mbuf *m) 599{ 600 struct ether_header *eh; 601 int isr; 602 u_short ether_type; 603#if defined(NETATALK) 604 struct llc *l; 605#endif 606 struct ip_fw *rule = NULL; 607 608 /* Extract info from dummynet tag, ignore others */ 609 for (;m->m_type == MT_TAG; m = m->m_next) 610 if (m->m_flags == PACKET_TAG_DUMMYNET) { 611 rule = ((struct dn_pkt *)m)->rule; 612 ifp = m->m_next->m_pkthdr.rcvif; 613 } 614 615 KASSERT(ifp != NULL, ("ether_demux: NULL interface pointer")); 616 617 eh = mtod(m, struct ether_header *); 618 619 if (rule) /* packet was already bridged */ 620 goto post_stats; 621 622 if (!(BDG_ACTIVE(ifp))) { 623 /* 624 * Discard packet if upper layers shouldn't see it because it 625 * was unicast to a different Ethernet address. If the driver 626 * is working properly, then this situation can only happen 627 * when the interface is in promiscuous mode. 628 */ 629 if ((ifp->if_flags & IFF_PROMISC) != 0 630 && (eh->ether_dhost[0] & 1) == 0 631 && bcmp(eh->ether_dhost, 632 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0 633 && (ifp->if_flags & IFF_PPROMISC) == 0) { 634 m_freem(m); 635 return; 636 } 637 } 638 639 /* Discard packet if interface is not up */ 640 if ((ifp->if_flags & IFF_UP) == 0) { 641 m_freem(m); 642 return; 643 } 644 if (eh->ether_dhost[0] & 1) { 645 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 646 sizeof(etherbroadcastaddr)) == 0) 647 m->m_flags |= M_BCAST; 648 else 649 m->m_flags |= M_MCAST; 650 } 651 if (m->m_flags & (M_BCAST|M_MCAST)) 652 ifp->if_imcasts++; 653 654post_stats: 655 if (IPFW_LOADED && ether_ipfw != 0) { 656 if (ether_ipfw_chk(&m, NULL, &rule, 0) == 0) { 657 if (m) 658 m_freem(m); 659 return; 660 } 661 } 662 663 /* 664 * If VLANs are configured on the interface, check to 665 * see if the device performed the decapsulation and 666 * provided us with the tag. 667 */ 668 if (ifp->if_nvlans && 669 m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL) != NULL) { 670 /* 671 * vlan_input() will either recursively call ether_input() 672 * or drop the packet. 673 */ 674 KASSERT(vlan_input_p != NULL,("ether_input: VLAN not loaded!")); 675 (*vlan_input_p)(ifp, m); 676 return; 677 } 678 679 ether_type = ntohs(eh->ether_type); 680 681 /* 682 * Handle protocols that expect to have the Ethernet header 683 * (and possibly FCS) intact. 684 */ 685 switch (ether_type) { 686 case ETHERTYPE_VLAN: 687 if (ifp->if_nvlans != 0) { 688 KASSERT(vlan_input_p,("ether_input: VLAN not loaded!")); 689 (*vlan_input_p)(ifp, m); 690 } else { 691 ifp->if_noproto++; 692 m_freem(m); 693 } 694 return; 695 } 696 697 /* Strip off Ethernet header. */ 698 m_adj(m, ETHER_HDR_LEN); 699 700 /* If the CRC is still on the packet, trim it off. */ 701 if (m->m_flags & M_HASFCS) { 702 m_adj(m, -ETHER_CRC_LEN); 703 m->m_flags &= ~M_HASFCS; 704 } 705 706 switch (ether_type) { 707#ifdef INET 708 case ETHERTYPE_IP: 709 if (ipflow_fastforward(m)) 710 return; 711 isr = NETISR_IP; 712 break; 713 714 case ETHERTYPE_ARP: 715 if (ifp->if_flags & IFF_NOARP) { 716 /* Discard packet if ARP is disabled on interface */ 717 m_freem(m); 718 return; 719 } 720 isr = NETISR_ARP; 721 break; 722#endif 723#ifdef IPX 724 case ETHERTYPE_IPX: 725 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 726 return; 727 isr = NETISR_IPX; 728 break; 729#endif 730#ifdef INET6 731 case ETHERTYPE_IPV6: 732 isr = NETISR_IPV6; 733 break; 734#endif 735#ifdef NETATALK 736 case ETHERTYPE_AT: 737 isr = NETISR_ATALK1; 738 break; 739 case ETHERTYPE_AARP: 740 isr = NETISR_AARP; 741 break; 742#endif /* NETATALK */ 743 default: 744#ifdef IPX 745 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 746 return; 747#endif /* IPX */ 748#if defined(NETATALK) 749 if (ether_type > ETHERMTU) 750 goto discard; 751 l = mtod(m, struct llc *); 752 if (l->llc_dsap == LLC_SNAP_LSAP && 753 l->llc_ssap == LLC_SNAP_LSAP && 754 l->llc_control == LLC_UI) { 755 if (Bcmp(&(l->llc_snap_org_code)[0], at_org_code, 756 sizeof(at_org_code)) == 0 && 757 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 758 m_adj(m, LLC_SNAPFRAMELEN); 759 isr = NETISR_ATALK2; 760 break; 761 } 762 if (Bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 763 sizeof(aarp_org_code)) == 0 && 764 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 765 m_adj(m, LLC_SNAPFRAMELEN); 766 isr = NETISR_AARP; 767 break; 768 } 769 } 770#endif /* NETATALK */ 771 goto discard; 772 } 773 netisr_dispatch(isr, m); 774 return; 775 776discard: 777 /* 778 * Packet is to be discarded. If netgraph is present, 779 * hand the packet to it for last chance processing; 780 * otherwise dispose of it. 781 */ 782 if (ng_ether_input_orphan_p != NULL) { 783 /* 784 * Put back the ethernet header so netgraph has a 785 * consistent view of inbound packets. 786 */ 787 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 788 (*ng_ether_input_orphan_p)(ifp, m); 789 return; 790 } 791 m_freem(m); 792} 793 794/* 795 * Convert Ethernet address to printable (loggable) representation. 796 * This routine is for compatibility; it's better to just use 797 * 798 * printf("%6D", <pointer to address>, ":"); 799 * 800 * since there's no static buffer involved. 801 */ 802char * 803ether_sprintf(const u_char *ap) 804{ 805 static char etherbuf[18]; 806 snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":"); 807 return (etherbuf); 808} 809 810/* 811 * Perform common duties while attaching to interface list 812 */ 813void 814ether_ifattach(struct ifnet *ifp, const u_int8_t *llc) 815{ 816 struct ifaddr *ifa; 817 struct sockaddr_dl *sdl; 818 819 ifp->if_type = IFT_ETHER; 820 ifp->if_addrlen = ETHER_ADDR_LEN; 821 ifp->if_hdrlen = ETHER_HDR_LEN; 822 if_attach(ifp); 823 ifp->if_mtu = ETHERMTU; 824 ifp->if_output = ether_output; 825 ifp->if_input = ether_input; 826 ifp->if_resolvemulti = ether_resolvemulti; 827 if (ifp->if_baudrate == 0) 828 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 829 ifp->if_broadcastaddr = etherbroadcastaddr; 830 831 ifa = ifaddr_byindex(ifp->if_index); 832 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__)); 833 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 834 sdl->sdl_type = IFT_ETHER; 835 sdl->sdl_alen = ifp->if_addrlen; 836 bcopy(llc, LLADDR(sdl), ifp->if_addrlen); 837 /* 838 * XXX: This doesn't belong here; we do it until 839 * XXX: all drivers are cleaned up 840 */ 841 if (llc != IFP2AC(ifp)->ac_enaddr) 842 bcopy(llc, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 843 844 bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN); 845 if (ng_ether_attach_p != NULL) 846 (*ng_ether_attach_p)(ifp); 847 if (BDG_LOADED) 848 bdgtakeifaces_ptr(); 849} 850 851/* 852 * Perform common duties while detaching an Ethernet interface 853 */ 854void 855ether_ifdetach(struct ifnet *ifp) 856{ 857 if (ng_ether_detach_p != NULL) 858 (*ng_ether_detach_p)(ifp); 859 bpfdetach(ifp); 860 if_detach(ifp); 861 if (BDG_LOADED) 862 bdgtakeifaces_ptr(); 863} 864 865SYSCTL_DECL(_net_link); 866SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 867SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 868 ðer_ipfw,0,"Pass ether pkts through firewall"); 869 870int 871ether_ioctl(ifp, command, data) 872 struct ifnet *ifp; 873 int command; 874 caddr_t data; 875{ 876 struct ifaddr *ifa = (struct ifaddr *) data; 877 struct ifreq *ifr = (struct ifreq *) data; 878 int error = 0; 879 880 switch (command) { 881 case SIOCSIFADDR: 882 ifp->if_flags |= IFF_UP; 883 884 switch (ifa->ifa_addr->sa_family) { 885#ifdef INET 886 case AF_INET: 887 ifp->if_init(ifp->if_softc); /* before arpwhohas */ 888 arp_ifinit(ifp, ifa); 889 break; 890#endif 891#ifdef IPX 892 /* 893 * XXX - This code is probably wrong 894 */ 895 case AF_IPX: 896 { 897 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); 898 struct arpcom *ac = IFP2AC(ifp); 899 900 if (ipx_nullhost(*ina)) 901 ina->x_host = 902 *(union ipx_host *) 903 ac->ac_enaddr; 904 else { 905 bcopy((caddr_t) ina->x_host.c_host, 906 (caddr_t) ac->ac_enaddr, 907 sizeof(ac->ac_enaddr)); 908 } 909 910 /* 911 * Set new address 912 */ 913 ifp->if_init(ifp->if_softc); 914 break; 915 } 916#endif 917 default: 918 ifp->if_init(ifp->if_softc); 919 break; 920 } 921 break; 922 923 case SIOCGIFADDR: 924 { 925 struct sockaddr *sa; 926 927 sa = (struct sockaddr *) & ifr->ifr_data; 928 bcopy(IFP2AC(ifp)->ac_enaddr, 929 (caddr_t) sa->sa_data, ETHER_ADDR_LEN); 930 } 931 break; 932 933 case SIOCSIFMTU: 934 /* 935 * Set the interface MTU. 936 */ 937 if (ifr->ifr_mtu > ETHERMTU) { 938 error = EINVAL; 939 } else { 940 ifp->if_mtu = ifr->ifr_mtu; 941 } 942 break; 943 default: 944 error = EINVAL; /* XXX netbsd has ENOTTY??? */ 945 break; 946 } 947 return (error); 948} 949 950static int 951ether_resolvemulti(ifp, llsa, sa) 952 struct ifnet *ifp; 953 struct sockaddr **llsa; 954 struct sockaddr *sa; 955{ 956 struct sockaddr_dl *sdl; 957 struct sockaddr_in *sin; 958#ifdef INET6 959 struct sockaddr_in6 *sin6; 960#endif 961 u_char *e_addr; 962 963 switch(sa->sa_family) { 964 case AF_LINK: 965 /* 966 * No mapping needed. Just check that it's a valid MC address. 967 */ 968 sdl = (struct sockaddr_dl *)sa; 969 e_addr = LLADDR(sdl); 970 if ((e_addr[0] & 1) != 1) 971 return EADDRNOTAVAIL; 972 *llsa = 0; 973 return 0; 974 975#ifdef INET 976 case AF_INET: 977 sin = (struct sockaddr_in *)sa; 978 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 979 return EADDRNOTAVAIL; 980 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 981 M_WAITOK|M_ZERO); 982 sdl->sdl_len = sizeof *sdl; 983 sdl->sdl_family = AF_LINK; 984 sdl->sdl_index = ifp->if_index; 985 sdl->sdl_type = IFT_ETHER; 986 sdl->sdl_alen = ETHER_ADDR_LEN; 987 e_addr = LLADDR(sdl); 988 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 989 *llsa = (struct sockaddr *)sdl; 990 return 0; 991#endif 992#ifdef INET6 993 case AF_INET6: 994 sin6 = (struct sockaddr_in6 *)sa; 995 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 996 /* 997 * An IP6 address of 0 means listen to all 998 * of the Ethernet multicast address used for IP6. 999 * (This is used for multicast routers.) 1000 */ 1001 ifp->if_flags |= IFF_ALLMULTI; 1002 *llsa = 0; 1003 return 0; 1004 } 1005 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1006 return EADDRNOTAVAIL; 1007 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1008 M_WAITOK|M_ZERO); 1009 sdl->sdl_len = sizeof *sdl; 1010 sdl->sdl_family = AF_LINK; 1011 sdl->sdl_index = ifp->if_index; 1012 sdl->sdl_type = IFT_ETHER; 1013 sdl->sdl_alen = ETHER_ADDR_LEN; 1014 e_addr = LLADDR(sdl); 1015 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1016 *llsa = (struct sockaddr *)sdl; 1017 return 0; 1018#endif 1019 1020 default: 1021 /* 1022 * Well, the text isn't quite right, but it's the name 1023 * that counts... 1024 */ 1025 return EAFNOSUPPORT; 1026 } 1027} 1028 1029static moduledata_t ether_mod = { 1030 "ether", 1031 NULL, 1032 0 1033}; 1034 1035DECLARE_MODULE(ether, ether_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 1036MODULE_VERSION(ether, 1); 1037