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: src/sys/net/if_ethersubr.c,v 1.70.2.33 2003/04/28 15:45:53 archie Exp $ 35 * $DragonFly: src/sys/net/if_ethersubr.c,v 1.24 2004/12/28 08:09:59 hsu Exp $ 36 */ 37 38 #include "opt_atalk.h" 39 #include "opt_inet.h" 40 #include "opt_inet6.h" 41 #include "opt_ipx.h" 42 #include "opt_bdg.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/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/socket.h> 51 #include <sys/sockio.h> 52 #include <sys/sysctl.h> 53 54 #include <net/if.h> 55 #include <net/netisr.h> 56 #include <net/route.h> 57 #include <net/if_llc.h> 58 #include <net/if_dl.h> 59 #include <net/if_types.h> 60 #include <net/bpf.h> 61 #include <net/ethernet.h> 62 #include <net/bridge/bridge.h> 63 64 #if defined(INET) || defined(INET6) 65 #include <netinet/in.h> 66 #include <netinet/in_var.h> 67 #include <netinet/if_ether.h> 68 #include <net/ipfw/ip_fw.h> 69 #include <net/dummynet/ip_dummynet.h> 70 #endif 71 #ifdef INET6 72 #include <netinet6/nd6.h> 73 #endif 74 75 #ifdef IPX 76 #include <netproto/ipx/ipx.h> 77 #include <netproto/ipx/ipx_if.h> 78 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m); 79 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, 80 short *tp, int *hlen); 81 #endif 82 83 #ifdef NS 84 #include <netns/ns.h> 85 #include <netns/ns_if.h> 86 ushort ns_nettype; 87 int ether_outputdebug = 0; 88 int ether_inputdebug = 0; 89 #endif 90 91 #ifdef NETATALK 92 #include <netproto/atalk/at.h> 93 #include <netproto/atalk/at_var.h> 94 #include <netproto/atalk/at_extern.h> 95 96 #define llc_snap_org_code llc_un.type_snap.org_code 97 #define llc_snap_ether_type llc_un.type_snap.ether_type 98 99 extern u_char at_org_code[3]; 100 extern u_char aarp_org_code[3]; 101 #endif /* NETATALK */ 102 103 /* netgraph node hooks for ng_ether(4) */ 104 void (*ng_ether_input_p)(struct ifnet *ifp, 105 struct mbuf **mp, struct ether_header *eh); 106 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, 107 struct mbuf *m, struct ether_header *eh); 108 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 109 void (*ng_ether_attach_p)(struct ifnet *ifp); 110 void (*ng_ether_detach_p)(struct ifnet *ifp); 111 112 int (*vlan_input_p)(struct ether_header *eh, struct mbuf *m); 113 int (*vlan_input_tag_p)(struct mbuf *m, uint16_t t); 114 115 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *, 116 struct rtentry *); 117 118 /* 119 * bridge support 120 */ 121 int do_bridge; 122 bridge_in_t *bridge_in_ptr; 123 bdg_forward_t *bdg_forward_ptr; 124 bdgtakeifaces_t *bdgtakeifaces_ptr; 125 struct bdg_softc *ifp2sc; 126 127 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 128 struct sockaddr *); 129 130 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = { 131 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 132 }; 133 134 #define gotoerr(e) do { error = (e); goto bad; } while (0) 135 #define IFP2AC(ifp) ((struct arpcom *)(ifp)) 136 137 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 138 struct ip_fw **rule, struct ether_header *eh, 139 boolean_t shared); 140 141 static int ether_ipfw; 142 SYSCTL_DECL(_net_link); 143 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 144 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 145 ðer_ipfw, 0, "Pass ether pkts through firewall"); 146 147 /* 148 * Ethernet output routine. 149 * Encapsulate a packet of type family for the local net. 150 * Use trailer local net encapsulation if enough data in first 151 * packet leaves a multiple of 512 bytes of data in remainder. 152 * Assumes that ifp is actually pointer to arpcom structure. 153 */ 154 static int 155 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 156 struct rtentry *rt) 157 { 158 struct ether_header *eh, *deh; 159 u_char *edst; 160 int loop_copy = 0; 161 int hlen = ETHER_HDR_LEN; /* link layer header length */ 162 struct arpcom *ac = IFP2AC(ifp); 163 int error; 164 165 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 166 gotoerr(ENETDOWN); 167 168 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT); 169 if (m == NULL) 170 return (ENOBUFS); 171 eh = mtod(m, struct ether_header *); 172 edst = eh->ether_dhost; 173 174 /* 175 * Fill in the destination ethernet address and frame type. 176 */ 177 switch (dst->sa_family) { 178 #ifdef INET 179 case AF_INET: 180 if (!arpresolve(ifp, rt, m, dst, edst)) 181 return (0); /* if not yet resolved */ 182 eh->ether_type = htons(ETHERTYPE_IP); 183 break; 184 #endif 185 #ifdef INET6 186 case AF_INET6: 187 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst)) 188 return (0); /* Something bad happenned. */ 189 eh->ether_type = htons(ETHERTYPE_IPV6); 190 break; 191 #endif 192 #ifdef IPX 193 case AF_IPX: 194 if (ef_outputp != NULL) { 195 error = ef_outputp(ifp, &m, dst, &eh->ether_type, 196 &hlen); 197 if (error) 198 goto bad; 199 } else { 200 eh->ether_type = htons(ETHERTYPE_IPX); 201 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 202 edst, ETHER_ADDR_LEN); 203 } 204 break; 205 #endif 206 #ifdef NETATALK 207 case AF_APPLETALK: { 208 struct at_ifaddr *aa; 209 210 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { 211 error = 0; /* XXX */ 212 goto bad; 213 } 214 /* 215 * In the phase 2 case, need to prepend an mbuf for 216 * the llc header. Since we must preserve the value 217 * of m, which is passed to us by value, we m_copy() 218 * the first mbuf, and use it for our llc header. 219 */ 220 if (aa->aa_flags & AFA_PHASE2) { 221 struct llc llc; 222 223 M_PREPEND(m, sizeof(struct llc), MB_DONTWAIT); 224 eh = mtod(m, struct ether_header *); 225 edst = eh->ether_dhost; 226 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 227 llc.llc_control = LLC_UI; 228 bcopy(at_org_code, llc.llc_snap_org_code, 229 sizeof at_org_code); 230 llc.llc_snap_ether_type = htons(ETHERTYPE_AT); 231 bcopy(&llc, 232 mtod(m, caddr_t) + sizeof(struct ether_header), 233 sizeof(struct llc)); 234 eh->ether_type = htons(m->m_pkthdr.len); 235 hlen = sizeof(struct llc) + ETHER_HDR_LEN; 236 } else { 237 eh->ether_type = htons(ETHERTYPE_AT); 238 } 239 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) 240 return (0); 241 break; 242 } 243 #endif 244 #ifdef NS 245 case AF_NS: 246 switch(ns_nettype) { 247 default: 248 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 249 eh->ether_type = 0x8137; 250 break; 251 case 0x0: /* Novell 802.3 */ 252 eh->ether_type = htons(m->m_pkthdr.len); 253 break; 254 case 0xe0e0: /* Novell 802.2 and Token-Ring */ 255 M_PREPEND(m, 3, MB_DONTWAIT); 256 eh = mtod(m, struct ether_header *); 257 edst = eh->ether_dhost; 258 eh->ether_type = htons(m->m_pkthdr.len); 259 cp = mtod(m, u_char *) + sizeof(struct ether_header); 260 *cp++ = 0xE0; 261 *cp++ = 0xE0; 262 *cp++ = 0x03; 263 break; 264 } 265 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), edst, 266 ETHER_ADDR_LEN); 267 /* 268 * XXX if ns_thishost is the same as the node's ethernet 269 * address then just the default code will catch this anyhow. 270 * So I'm not sure if this next clause should be here at all? 271 * [JRE] 272 */ 273 if (bcmp(edst, &ns_thishost, ETHER_ADDR_LEN) == 0) { 274 m->m_pkthdr.rcvif = ifp; 275 netisr_dispatch(NETISR_NS, m); 276 return (error); 277 } 278 if (bcmp(edst, &ns_broadhost, ETHER_ADDR_LEN) == 0) 279 m->m_flags |= M_BCAST; 280 break; 281 #endif 282 case pseudo_AF_HDRCMPLT: 283 case AF_UNSPEC: 284 loop_copy = -1; /* if this is for us, don't do it */ 285 deh = (struct ether_header *)dst->sa_data; 286 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN); 287 eh->ether_type = deh->ether_type; 288 break; 289 290 default: 291 printf("%s: can't handle af%d\n", ifp->if_xname, 292 dst->sa_family); 293 gotoerr(EAFNOSUPPORT); 294 } 295 296 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */ 297 memcpy(eh->ether_shost, 298 ((struct ether_header *)dst->sa_data)->ether_shost, 299 ETHER_ADDR_LEN); 300 else 301 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN); 302 303 /* 304 * If a simplex interface, and the packet is being sent to our 305 * Ethernet address or a broadcast address, loopback a copy. 306 * XXX To make a simplex device behave exactly like a duplex 307 * device, we should copy in the case of sending to our own 308 * ethernet address (thus letting the original actually appear 309 * on the wire). However, we don't do that here for security 310 * reasons and compatibility with the original behavior. 311 */ 312 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 313 int csum_flags = 0; 314 315 if (m->m_pkthdr.csum_flags & CSUM_IP) 316 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 317 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 318 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 319 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 320 struct mbuf *n; 321 322 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) { 323 n->m_pkthdr.csum_flags |= csum_flags; 324 if (csum_flags & CSUM_DATA_VALID) 325 n->m_pkthdr.csum_data = 0xffff; 326 if_simloop(ifp, n, dst->sa_family, hlen); 327 } else 328 ifp->if_iqdrops++; 329 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 330 ETHER_ADDR_LEN) == 0) { 331 m->m_pkthdr.csum_flags |= csum_flags; 332 if (csum_flags & CSUM_DATA_VALID) 333 m->m_pkthdr.csum_data = 0xffff; 334 if_simloop(ifp, m, dst->sa_family, hlen); 335 return (0); /* XXX */ 336 } 337 } 338 339 /* Handle ng_ether(4) processing, if any */ 340 if (ng_ether_output_p != NULL) { 341 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) { 342 bad: if (m != NULL) 343 m_freem(m); 344 return (error); 345 } 346 if (m == NULL) 347 return (0); 348 } 349 350 /* Continue with link-layer output */ 351 return ether_output_frame(ifp, m); 352 } 353 354 /* 355 * Ethernet link layer output routine to send a raw frame to the device. 356 * 357 * This assumes that the 14 byte Ethernet header is present and contiguous 358 * in the first mbuf (if BRIDGE'ing). 359 */ 360 int 361 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 362 { 363 struct ip_fw *rule = NULL; 364 int error = 0; 365 int s; 366 367 /* Extract info from dummynet tag, ignore others */ 368 while (m->m_type == MT_TAG) { 369 if (m->m_flags == PACKET_TAG_DUMMYNET) { 370 rule = ((struct dn_pkt *)m)->rule; 371 break; 372 } 373 m = m->m_next; 374 } 375 if (rule != NULL) /* packet was already bridged */ 376 goto no_bridge; 377 378 if (BDG_ACTIVE(ifp)) { 379 struct ether_header *eh; /* a pointer suffices */ 380 381 m->m_pkthdr.rcvif = NULL; 382 eh = mtod(m, struct ether_header *); 383 m_adj(m, ETHER_HDR_LEN); 384 m = bdg_forward_ptr(m, eh, ifp); 385 if (m != NULL) 386 m_freem(m); 387 return (0); 388 } 389 390 no_bridge: 391 s = splimp(); 392 if (IPFW_LOADED && ether_ipfw != 0) { 393 struct ether_header save_eh, *eh; 394 395 eh = mtod(m, struct ether_header *); 396 save_eh = *eh; 397 m_adj(m, ETHER_HDR_LEN); 398 if (!ether_ipfw_chk(&m, ifp, &rule, eh, FALSE)) { 399 if (m != NULL) { 400 m_freem(m); 401 return ENOBUFS; /* pkt dropped */ 402 } else 403 return 0; /* consumed e.g. in a pipe */ 404 } 405 eh = mtod(m, struct ether_header *); 406 /* packet was ok, restore the ethernet header */ 407 if ((void *)(eh + 1) == (void *)m->m_data) { 408 m->m_data -= ETHER_HDR_LEN ; 409 m->m_len += ETHER_HDR_LEN ; 410 m->m_pkthdr.len += ETHER_HDR_LEN ; 411 } else { 412 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 413 if (m == NULL) /* nope... */ 414 return ENOBUFS; 415 bcopy(&save_eh, mtod(m, struct ether_header *), 416 ETHER_HDR_LEN); 417 } 418 } 419 420 /* 421 * Queue message on interface, update output statistics if 422 * successful, and start output if interface not yet active. 423 */ 424 if (!IF_HANDOFF(&ifp->if_snd, m, ifp)) 425 error = ENOBUFS; 426 splx(s); 427 return (error); 428 } 429 430 /* 431 * ipfw processing for ethernet packets (in and out). 432 * The second parameter is NULL from ether_demux(), and ifp from 433 * ether_output_frame(). This section of code could be used from 434 * bridge.c as well as long as we use some extra info 435 * to distinguish that case from ether_output_frame(). 436 */ 437 static boolean_t 438 ether_ipfw_chk( 439 struct mbuf **m0, 440 struct ifnet *dst, 441 struct ip_fw **rule, 442 struct ether_header *eh, 443 boolean_t shared) 444 { 445 struct ether_header save_eh = *eh; /* might be a ptr in m */ 446 struct ip_fw_args args; 447 int i; 448 449 if (*rule != NULL && fw_one_pass) 450 return TRUE; /* dummynet packet, already partially processed */ 451 452 /* 453 * I need some amount of data to be contiguous, and in case others 454 * need the packet (shared==TRUE), it also better be in the first mbuf. 455 */ 456 i = min((*m0)->m_pkthdr.len, max_protohdr); 457 if (shared || (*m0)->m_len < i) { 458 *m0 = m_pullup(*m0, i); 459 if (*m0 == NULL) 460 return FALSE; 461 } 462 463 args.m = *m0; /* the packet we are looking at */ 464 args.oif = dst; /* destination, if any */ 465 args.divert_rule = 0; /* we do not support divert yet */ 466 args.rule = *rule; /* matching rule to restart */ 467 args.next_hop = NULL; /* we do not support forward yet */ 468 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 469 i = ip_fw_chk_ptr(&args); 470 *m0 = args.m; 471 *rule = args.rule; 472 473 if ((i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */ 474 return FALSE; 475 476 if (i == 0) /* a PASS rule. */ 477 return TRUE; 478 479 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) { 480 /* 481 * Pass the pkt to dummynet, which consumes it. 482 * If shared, make a copy and keep the original. 483 */ 484 struct mbuf *m ; 485 486 if (shared) { 487 m = m_copypacket(*m0, MB_DONTWAIT); 488 if (m == NULL) 489 return FALSE; 490 } else { 491 m = *m0 ; /* pass the original to dummynet */ 492 *m0 = NULL ; /* and nothing back to the caller */ 493 } 494 /* 495 * Prepend the header, optimize for the common case of 496 * eh pointing into the mbuf. 497 */ 498 if ((void *)(eh + 1) == (void *)m->m_data) { 499 m->m_data -= ETHER_HDR_LEN ; 500 m->m_len += ETHER_HDR_LEN ; 501 m->m_pkthdr.len += ETHER_HDR_LEN ; 502 } else { 503 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 504 if (m == NULL) 505 return FALSE; 506 bcopy(&save_eh, mtod(m, struct ether_header *), 507 ETHER_HDR_LEN); 508 } 509 ip_dn_io_ptr(m, (i & 0xffff), 510 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 511 return FALSE; 512 } 513 /* 514 * XXX at some point add support for divert/forward actions. 515 * If none of the above matches, we have to drop the pkt. 516 */ 517 return FALSE; 518 } 519 520 /* 521 * XXX merge this function with ether_input. 522 */ 523 static void 524 ether_input_internal(struct ifnet *ifp, struct mbuf *m) 525 { 526 ether_input(ifp, NULL, m); 527 } 528 529 /* 530 * Process a received Ethernet packet. We have two different interfaces: 531 * one (conventional) assumes the packet in the mbuf, with the ethernet 532 * header provided separately in *eh. The second one (new) has everything 533 * in the mbuf, and we can tell it because eh == NULL. 534 * The caller MUST MAKE SURE that there are at least 535 * sizeof(struct ether_header) bytes in the first mbuf. 536 * 537 * This allows us to concentrate in one place a bunch of code which 538 * is replicated in all device drivers. Also, many functions called 539 * from ether_input() try to put the eh back into the mbuf, so we 540 * can later propagate the 'contiguous packet' interface to them, 541 * and handle the old interface just here. 542 * 543 * NOTA BENE: for many drivers "eh" is a pointer into the first mbuf or 544 * cluster, right before m_data. So be very careful when working on m, 545 * as you could destroy *eh !! 546 * 547 * First we perform any link layer operations, then continue 548 * to the upper layers with ether_demux(). 549 */ 550 void 551 ether_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 552 { 553 struct ether_header save_eh; 554 555 if (eh == NULL) { 556 if (m->m_len < sizeof(struct ether_header)) { 557 /* XXX error in the caller. */ 558 m_freem(m); 559 return; 560 } 561 m->m_pkthdr.rcvif = ifp; 562 eh = mtod(m, struct ether_header *); 563 m_adj(m, sizeof(struct ether_header)); 564 /* XXX */ 565 /* m->m_pkthdr.len = m->m_len; */ 566 } 567 568 /* Check for a BPF tap */ 569 if (ifp->if_bpf != NULL) { 570 struct m_hdr mh; 571 572 /* This kludge is OK; BPF treats the "mbuf" as read-only */ 573 mh.mh_next = m; 574 mh.mh_data = (char *)eh; 575 mh.mh_len = ETHER_HDR_LEN; 576 bpf_mtap(ifp, (struct mbuf *)&mh); 577 } 578 579 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 580 581 /* Handle ng_ether(4) processing, if any */ 582 if (ng_ether_input_p != NULL) { 583 (*ng_ether_input_p)(ifp, &m, eh); 584 if (m == NULL) 585 return; 586 } 587 588 /* Check for bridging mode */ 589 if (BDG_ACTIVE(ifp)) { 590 struct ifnet *bif; 591 592 /* Check with bridging code */ 593 if ((bif = bridge_in_ptr(ifp, eh)) == BDG_DROP) { 594 m_freem(m); 595 return; 596 } 597 if (bif != BDG_LOCAL) { 598 save_eh = *eh ; /* because it might change */ 599 m = bdg_forward_ptr(m, eh, bif); /* needs forwarding */ 600 /* 601 * Do not continue if bdg_forward_ptr() processed our 602 * packet (and cleared the mbuf pointer m) or if 603 * it dropped (m_free'd) the packet itself. 604 */ 605 if (m == NULL) { 606 if (bif == BDG_BCAST || bif == BDG_MCAST) 607 printf("bdg_forward drop MULTICAST PKT\n"); 608 return; 609 } 610 eh = &save_eh ; 611 } 612 if (bif == BDG_LOCAL || bif == BDG_BCAST || bif == BDG_MCAST) 613 goto recvLocal; /* receive locally */ 614 615 /* If not local and not multicast, just drop it */ 616 if (m != NULL) 617 m_freem(m); 618 return; 619 } 620 621 recvLocal: 622 /* Continue with upper layer processing */ 623 ether_demux(ifp, eh, m); 624 } 625 626 /* 627 * Upper layer processing for a received Ethernet packet. 628 */ 629 void 630 ether_demux(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 631 { 632 int isr; 633 u_short ether_type; 634 struct ip_fw *rule = NULL; 635 #ifdef NETATALK 636 struct llc *l; 637 #endif 638 639 /* Extract info from dummynet tag, ignore others */ 640 while (m->m_type == MT_TAG) { 641 if (m->m_flags == PACKET_TAG_DUMMYNET) { 642 rule = ((struct dn_pkt *)m)->rule; 643 ifp = m->m_next->m_pkthdr.rcvif; 644 break; 645 } 646 m = m->m_next; 647 } 648 if (rule) /* packet was already bridged */ 649 goto post_stats; 650 651 /* 652 * Discard packet if upper layers shouldn't see it because 653 * it was unicast to a different Ethernet address. If the 654 * driver is working properly, then this situation can only 655 * happen when the interface is in promiscuous mode. 656 */ 657 if (!BDG_ACTIVE(ifp) && 658 ((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) && 659 (eh->ether_dhost[0] & 1) == 0 && 660 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) { 661 m_freem(m); 662 return; 663 } 664 /* Discard packet if interface is not up */ 665 if (!(ifp->if_flags & IFF_UP)) { 666 m_freem(m); 667 return; 668 } 669 if (eh->ether_dhost[0] & 1) { 670 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost, 671 ifp->if_addrlen) == 0) 672 m->m_flags |= M_BCAST; 673 else 674 m->m_flags |= M_MCAST; 675 ifp->if_imcasts++; 676 } 677 678 post_stats: 679 if (IPFW_LOADED && ether_ipfw != 0) { 680 if (!ether_ipfw_chk(&m, NULL, &rule, eh, FALSE)) { 681 if (m != NULL) 682 m_freem(m); 683 return; 684 } 685 eh = mtod(m, struct ether_header *); 686 } 687 688 ether_type = ntohs(eh->ether_type); 689 690 switch (ether_type) { 691 #ifdef INET 692 case ETHERTYPE_IP: 693 if (ipflow_fastforward(m)) 694 return; 695 isr = NETISR_IP; 696 break; 697 698 case ETHERTYPE_ARP: 699 if (ifp->if_flags & IFF_NOARP) { 700 /* Discard packet if ARP is disabled on interface */ 701 m_freem(m); 702 return; 703 } 704 isr = NETISR_ARP; 705 break; 706 #endif 707 708 #ifdef INET6 709 case ETHERTYPE_IPV6: 710 isr = NETISR_IPV6; 711 break; 712 #endif 713 714 #ifdef IPX 715 case ETHERTYPE_IPX: 716 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 717 return; 718 isr = NETISR_IPX; 719 break; 720 #endif 721 722 #ifdef NS 723 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 724 isr = NETISR_NS; 725 break; 726 727 #endif 728 729 #ifdef NETATALK 730 case ETHERTYPE_AT: 731 isr = NETISR_ATALK1; 732 break; 733 case ETHERTYPE_AARP: 734 isr = NETISR_AARP; 735 break; 736 #endif 737 738 case ETHERTYPE_VLAN: 739 if (vlan_input_p != NULL) 740 (*vlan_input_p)(eh, m); 741 else { 742 m->m_pkthdr.rcvif->if_noproto++; 743 m_freem(m); 744 } 745 return; 746 747 default: 748 #ifdef IPX 749 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 750 return; 751 #endif 752 #ifdef NS 753 checksum = mtod(m, ushort *); 754 /* Novell 802.3 */ 755 if ((ether_type <= ETHERMTU) && 756 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) { 757 if (*checksum == 0xE0E0) { 758 m->m_pkthdr.len -= 3; 759 m->m_len -= 3; 760 m->m_data += 3; 761 } 762 isr = NETISR_NS; 763 break; 764 } 765 #endif 766 #ifdef NETATALK 767 if (ether_type > ETHERMTU) 768 goto dropanyway; 769 l = mtod(m, struct llc *); 770 if (l->llc_dsap == LLC_SNAP_LSAP && 771 l->llc_ssap == LLC_SNAP_LSAP && 772 l->llc_control == LLC_UI) { 773 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code, 774 sizeof(at_org_code)) == 0 && 775 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 776 m_adj(m, sizeof(struct llc)); 777 isr = NETISR_ATALK2; 778 break; 779 } 780 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 781 sizeof(aarp_org_code)) == 0 && 782 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 783 m_adj(m, sizeof(struct llc)); 784 isr = NETISR_AARP; 785 break; 786 } 787 } 788 dropanyway: 789 #endif 790 if (ng_ether_input_orphan_p != NULL) 791 (*ng_ether_input_orphan_p)(ifp, m, eh); 792 else 793 m_freem(m); 794 return; 795 } 796 netisr_dispatch(isr, m); 797 } 798 799 /* 800 * Perform common duties while attaching to interface list 801 */ 802 803 void 804 ether_ifattach(struct ifnet *ifp, uint8_t *lla) 805 { 806 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header)); 807 } 808 809 void 810 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen) 811 { 812 struct ifaddr *ifa; 813 struct sockaddr_dl *sdl; 814 815 ifp->if_type = IFT_ETHER; 816 ifp->if_addrlen = ETHER_ADDR_LEN; 817 ifp->if_hdrlen = ETHER_HDR_LEN; 818 if_attach(ifp); 819 ifp->if_mtu = ETHERMTU; 820 if (ifp->if_baudrate == 0) 821 ifp->if_baudrate = 10000000; 822 ifp->if_output = ether_output; 823 ifp->if_input = ether_input_internal; 824 ifp->if_resolvemulti = ether_resolvemulti; 825 ifp->if_broadcastaddr = etherbroadcastaddr; 826 ifa = ifnet_addrs[ifp->if_index - 1]; 827 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__)); 828 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 829 sdl->sdl_type = IFT_ETHER; 830 sdl->sdl_alen = ifp->if_addrlen; 831 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 832 /* 833 * XXX Keep the current drivers happy. 834 * XXX Remove once all drivers have been cleaned up 835 */ 836 if (lla != IFP2AC(ifp)->ac_enaddr) 837 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 838 bpfattach(ifp, dlt, hdrlen); 839 if (ng_ether_attach_p != NULL) 840 (*ng_ether_attach_p)(ifp); 841 if (BDG_LOADED) 842 bdgtakeifaces_ptr(); 843 844 if_printf(ifp, "MAC address: %6D\n", lla, ":"); 845 } 846 847 /* 848 * Perform common duties while detaching an Ethernet interface 849 */ 850 void 851 ether_ifdetach(struct ifnet *ifp) 852 { 853 int s; 854 855 s = splnet(); 856 if_down(ifp); 857 splx(s); 858 859 if (ng_ether_detach_p != NULL) 860 (*ng_ether_detach_p)(ifp); 861 bpfdetach(ifp); 862 if_detach(ifp); 863 if (BDG_LOADED) 864 bdgtakeifaces_ptr(); 865 } 866 867 int 868 ether_ioctl(struct ifnet *ifp, int command, caddr_t data) 869 { 870 struct ifaddr *ifa = (struct ifaddr *) data; 871 struct ifreq *ifr = (struct ifreq *) data; 872 int error = 0; 873 874 switch (command) { 875 case SIOCSIFADDR: 876 ifp->if_flags |= IFF_UP; 877 878 switch (ifa->ifa_addr->sa_family) { 879 #ifdef INET 880 case AF_INET: 881 ifp->if_init(ifp->if_softc); /* before arpwhohas */ 882 arp_ifinit(ifp, ifa); 883 break; 884 #endif 885 #ifdef IPX 886 /* 887 * XXX - This code is probably wrong 888 */ 889 case AF_IPX: 890 { 891 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr; 892 struct arpcom *ac = IFP2AC(ifp); 893 894 if (ipx_nullhost(*ina)) 895 ina->x_host = *(union ipx_host *) ac->ac_enaddr; 896 else 897 bcopy(ina->x_host.c_host, ac->ac_enaddr, 898 sizeof ac->ac_enaddr); 899 900 ifp->if_init(ifp->if_softc); /* Set new address. */ 901 break; 902 } 903 #endif 904 #ifdef NS 905 /* 906 * XXX - This code is probably wrong 907 */ 908 case AF_NS: 909 { 910 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr); 911 struct arpcom *ac = IFP2AC(ifp); 912 913 if (ns_nullhost(*ina)) 914 ina->x_host = *(union ns_host *)(ac->ac_enaddr); 915 else 916 bcopy(ina->x_host.c_host, ac->ac_enaddr, 917 sizeof ac->ac_enaddr); 918 919 /* 920 * Set new address 921 */ 922 ifp->if_init(ifp->if_softc); 923 break; 924 } 925 #endif 926 default: 927 ifp->if_init(ifp->if_softc); 928 break; 929 } 930 break; 931 932 case SIOCGIFADDR: 933 bcopy(IFP2AC(ifp)->ac_enaddr, 934 ((struct sockaddr *)ifr->ifr_data)->sa_data, 935 ETHER_ADDR_LEN); 936 break; 937 938 case SIOCSIFMTU: 939 /* 940 * Set the interface MTU. 941 */ 942 if (ifr->ifr_mtu > ETHERMTU) { 943 error = EINVAL; 944 } else { 945 ifp->if_mtu = ifr->ifr_mtu; 946 } 947 break; 948 default: 949 error = EINVAL; 950 break; 951 } 952 return (error); 953 } 954 955 int 956 ether_resolvemulti( 957 struct ifnet *ifp, 958 struct sockaddr **llsa, 959 struct sockaddr *sa) 960 { 961 struct sockaddr_dl *sdl; 962 struct sockaddr_in *sin; 963 #ifdef INET6 964 struct sockaddr_in6 *sin6; 965 #endif 966 u_char *e_addr; 967 968 switch(sa->sa_family) { 969 case AF_LINK: 970 /* 971 * No mapping needed. Just check that it's a valid MC address. 972 */ 973 sdl = (struct sockaddr_dl *)sa; 974 e_addr = LLADDR(sdl); 975 if ((e_addr[0] & 1) != 1) 976 return EADDRNOTAVAIL; 977 *llsa = 0; 978 return 0; 979 980 #ifdef INET 981 case AF_INET: 982 sin = (struct sockaddr_in *)sa; 983 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 984 return EADDRNOTAVAIL; 985 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 986 M_WAITOK | M_ZERO); 987 sdl->sdl_len = sizeof *sdl; 988 sdl->sdl_family = AF_LINK; 989 sdl->sdl_index = ifp->if_index; 990 sdl->sdl_type = IFT_ETHER; 991 sdl->sdl_alen = ETHER_ADDR_LEN; 992 e_addr = LLADDR(sdl); 993 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 994 *llsa = (struct sockaddr *)sdl; 995 return 0; 996 #endif 997 #ifdef INET6 998 case AF_INET6: 999 sin6 = (struct sockaddr_in6 *)sa; 1000 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1001 /* 1002 * An IP6 address of 0 means listen to all 1003 * of the Ethernet multicast address used for IP6. 1004 * (This is used for multicast routers.) 1005 */ 1006 ifp->if_flags |= IFF_ALLMULTI; 1007 *llsa = 0; 1008 return 0; 1009 } 1010 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1011 return EADDRNOTAVAIL; 1012 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1013 M_WAITOK | M_ZERO); 1014 sdl->sdl_len = sizeof *sdl; 1015 sdl->sdl_family = AF_LINK; 1016 sdl->sdl_index = ifp->if_index; 1017 sdl->sdl_type = IFT_ETHER; 1018 sdl->sdl_alen = ETHER_ADDR_LEN; 1019 e_addr = LLADDR(sdl); 1020 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1021 *llsa = (struct sockaddr *)sdl; 1022 return 0; 1023 #endif 1024 1025 default: 1026 /* 1027 * Well, the text isn't quite right, but it's the name 1028 * that counts... 1029 */ 1030 return EAFNOSUPPORT; 1031 } 1032 } 1033 1034 #if 0 1035 /* 1036 * This is for reference. We have a table-driven version 1037 * of the little-endian crc32 generator, which is faster 1038 * than the double-loop. 1039 */ 1040 uint32_t 1041 ether_crc32_le(const uint8_t *buf, size_t len) 1042 { 1043 uint32_t c, crc, carry; 1044 size_t i, j; 1045 1046 crc = 0xffffffffU; /* initial value */ 1047 1048 for (i = 0; i < len; i++) { 1049 c = buf[i]; 1050 for (j = 0; j < 8; j++) { 1051 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1052 crc >>= 1; 1053 c >>= 1; 1054 if (carry) 1055 crc = (crc ^ ETHER_CRC_POLY_LE); 1056 } 1057 } 1058 1059 return (crc); 1060 } 1061 #else 1062 uint32_t 1063 ether_crc32_le(const uint8_t *buf, size_t len) 1064 { 1065 static const uint32_t crctab[] = { 1066 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1067 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1068 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1069 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1070 }; 1071 uint32_t crc; 1072 size_t i; 1073 1074 crc = 0xffffffffU; /* initial value */ 1075 1076 for (i = 0; i < len; i++) { 1077 crc ^= buf[i]; 1078 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1079 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1080 } 1081 1082 return (crc); 1083 } 1084 #endif 1085 1086 uint32_t 1087 ether_crc32_be(const uint8_t *buf, size_t len) 1088 { 1089 uint32_t c, crc, carry; 1090 size_t i, j; 1091 1092 crc = 0xffffffffU; /* initial value */ 1093 1094 for (i = 0; i < len; i++) { 1095 c = buf[i]; 1096 for (j = 0; j < 8; j++) { 1097 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1098 crc <<= 1; 1099 c >>= 1; 1100 if (carry) 1101 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1102 } 1103 } 1104 1105 return (crc); 1106 } 1107