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 1.19 2004/11/08 10:28:48 joerg 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, 80 struct sockaddr *dst, 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 /* bridge support */ 119 int do_bridge; 120 bridge_in_t *bridge_in_ptr; 121 bdg_forward_t *bdg_forward_ptr; 122 bdgtakeifaces_t *bdgtakeifaces_ptr; 123 struct bdg_softc *ifp2sc; 124 125 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 126 struct sockaddr *); 127 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = { 128 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 129 }; 130 131 #define senderr(e) do { error = (e); goto bad;} while (0) 132 #define IFP2AC(IFP) ((struct arpcom *)IFP) 133 134 int 135 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 136 struct ip_fw **rule, struct ether_header *eh, int shared); 137 static int ether_ipfw; 138 139 /* 140 * Ethernet output routine. 141 * Encapsulate a packet of type family for the local net. 142 * Use trailer local net encapsulation if enough data in first 143 * packet leaves a multiple of 512 bytes of data in remainder. 144 * Assumes that ifp is actually pointer to arpcom structure. 145 */ 146 static int 147 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 148 struct rtentry *rt0) 149 { 150 short type; 151 int error = 0, hdrcmplt = 0; 152 u_char esrc[6], edst[6]; 153 struct rtentry *rt; 154 struct ether_header *eh; 155 int loop_copy = 0; 156 int hlen; /* link layer header lenght */ 157 struct arpcom *ac = IFP2AC(ifp); 158 159 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 160 senderr(ENETDOWN); 161 rt = rt0; 162 if (rt) { 163 if ((rt->rt_flags & RTF_UP) == 0) { 164 rt0 = rt = rtalloc1(dst, 1, 0UL); 165 if (rt0) 166 rt->rt_refcnt--; 167 else 168 senderr(EHOSTUNREACH); 169 } 170 if (rt->rt_flags & RTF_GATEWAY) { 171 if (rt->rt_gwroute == 0) 172 goto lookup; 173 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 174 rtfree(rt); rt = rt0; 175 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 176 0UL); 177 if ((rt = rt->rt_gwroute) == 0) 178 senderr(EHOSTUNREACH); 179 } 180 } 181 if (rt->rt_flags & RTF_REJECT) 182 if (rt->rt_rmx.rmx_expire == 0 || 183 time_second < rt->rt_rmx.rmx_expire) 184 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 185 } 186 hlen = ETHER_HDR_LEN; 187 switch (dst->sa_family) { 188 #ifdef INET 189 case AF_INET: 190 if (!arpresolve(ifp, rt, m, dst, edst, rt0)) 191 return (0); /* if not yet resolved */ 192 type = htons(ETHERTYPE_IP); 193 break; 194 #endif 195 #ifdef INET6 196 case AF_INET6: 197 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) { 198 /* Something bad happened */ 199 return(0); 200 } 201 type = htons(ETHERTYPE_IPV6); 202 break; 203 #endif 204 #ifdef IPX 205 case AF_IPX: 206 if (ef_outputp) { 207 error = ef_outputp(ifp, &m, dst, &type, &hlen); 208 if (error) 209 goto bad; 210 } else 211 type = htons(ETHERTYPE_IPX); 212 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 213 (caddr_t)edst, sizeof (edst)); 214 break; 215 #endif 216 #ifdef NETATALK 217 case AF_APPLETALK: 218 { 219 struct at_ifaddr *aa; 220 221 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { 222 goto bad; 223 } 224 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) 225 return (0); 226 /* 227 * In the phase 2 case, need to prepend an mbuf for the llc header. 228 * Since we must preserve the value of m, which is passed to us by 229 * value, we m_copy() the first mbuf, and use it for our llc header. 230 */ 231 if ( aa->aa_flags & AFA_PHASE2 ) { 232 struct llc llc; 233 234 M_PREPEND(m, sizeof(struct llc), MB_WAIT); 235 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 236 llc.llc_control = LLC_UI; 237 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); 238 llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); 239 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 240 type = htons(m->m_pkthdr.len); 241 hlen = sizeof(struct llc) + ETHER_HDR_LEN; 242 } else { 243 type = htons(ETHERTYPE_AT); 244 } 245 break; 246 } 247 #endif /* NETATALK */ 248 #ifdef NS 249 case AF_NS: 250 switch(ns_nettype){ 251 default: 252 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 253 type = 0x8137; 254 break; 255 case 0x0: /* Novell 802.3 */ 256 type = htons( m->m_pkthdr.len); 257 break; 258 case 0xe0e0: /* Novell 802.2 and Token-Ring */ 259 M_PREPEND(m, 3, MB_WAIT); 260 type = htons( m->m_pkthdr.len); 261 cp = mtod(m, u_char *); 262 *cp++ = 0xE0; 263 *cp++ = 0xE0; 264 *cp++ = 0x03; 265 break; 266 } 267 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 268 (caddr_t)edst, sizeof (edst)); 269 /* 270 * XXX if ns_thishost is the same as the node's ethernet 271 * address then just the default code will catch this anyhow. 272 * So I'm not sure if this next clause should be here at all? 273 * [JRE] 274 */ 275 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))){ 276 m->m_pkthdr.rcvif = ifp; 277 netisr_dispatch(NETISR_NS, m); 278 return (error); 279 } 280 if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){ 281 m->m_flags |= M_BCAST; 282 } 283 break; 284 #endif /* NS */ 285 286 case pseudo_AF_HDRCMPLT: 287 hdrcmplt = 1; 288 eh = (struct ether_header *)dst->sa_data; 289 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); 290 /* FALLTHROUGH */ 291 292 case AF_UNSPEC: 293 loop_copy = -1; /* if this is for us, don't do it */ 294 eh = (struct ether_header *)dst->sa_data; 295 (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); 296 type = eh->ether_type; 297 break; 298 299 default: 300 printf("%s: can't handle af%d\n", ifp->if_xname, 301 dst->sa_family); 302 senderr(EAFNOSUPPORT); 303 } 304 305 /* 306 * Add local net header. If no space in first mbuf, 307 * allocate another. 308 */ 309 M_PREPEND(m, sizeof (struct ether_header), MB_DONTWAIT); 310 if (m == 0) 311 senderr(ENOBUFS); 312 eh = mtod(m, struct ether_header *); 313 (void)memcpy(&eh->ether_type, &type, 314 sizeof(eh->ether_type)); 315 (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); 316 if (hdrcmplt) 317 (void)memcpy(eh->ether_shost, esrc, 318 sizeof(eh->ether_shost)); 319 else 320 (void)memcpy(eh->ether_shost, ac->ac_enaddr, 321 sizeof(eh->ether_shost)); 322 323 /* 324 * If a simplex interface, and the packet is being sent to our 325 * Ethernet address or a broadcast address, loopback a copy. 326 * XXX To make a simplex device behave exactly like a duplex 327 * device, we should copy in the case of sending to our own 328 * ethernet address (thus letting the original actually appear 329 * on the wire). However, we don't do that here for security 330 * reasons and compatibility with the original behavior. 331 */ 332 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 333 int csum_flags = 0; 334 335 if (m->m_pkthdr.csum_flags & CSUM_IP) 336 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID); 337 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 338 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 339 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 340 struct mbuf *n; 341 342 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 343 n->m_pkthdr.csum_flags |= csum_flags; 344 if (csum_flags & CSUM_DATA_VALID) 345 n->m_pkthdr.csum_data = 0xffff; 346 (void)if_simloop(ifp, n, dst->sa_family, hlen); 347 } else 348 ifp->if_iqdrops++; 349 } else if (bcmp(eh->ether_dhost, 350 eh->ether_shost, ETHER_ADDR_LEN) == 0) { 351 m->m_pkthdr.csum_flags |= csum_flags; 352 if (csum_flags & CSUM_DATA_VALID) 353 m->m_pkthdr.csum_data = 0xffff; 354 (void) if_simloop(ifp, m, dst->sa_family, hlen); 355 return (0); /* XXX */ 356 } 357 } 358 359 /* Handle ng_ether(4) processing, if any */ 360 if (ng_ether_output_p != NULL) { 361 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) { 362 bad: if (m != NULL) 363 m_freem(m); 364 return (error); 365 } 366 if (m == NULL) 367 return (0); 368 } 369 370 /* Continue with link-layer output */ 371 return ether_output_frame(ifp, m); 372 } 373 374 /* 375 * Ethernet link layer output routine to send a raw frame to the device. 376 * 377 * This assumes that the 14 byte Ethernet header is present and contiguous 378 * in the first mbuf (if BRIDGE'ing). 379 */ 380 int 381 ether_output_frame(ifp, m) 382 struct ifnet *ifp; 383 struct mbuf *m; 384 { 385 int error = 0; 386 int s; 387 struct ip_fw *rule = NULL; 388 389 /* Extract info from dummynet tag, ignore others */ 390 for (; m->m_type == MT_TAG; m = m->m_next) 391 if (m->m_flags == PACKET_TAG_DUMMYNET) 392 rule = ((struct dn_pkt *)m)->rule; 393 394 if (rule) /* packet was already bridged */ 395 goto no_bridge; 396 397 if (BDG_ACTIVE(ifp) ) { 398 struct ether_header *eh; /* a ptr suffices */ 399 400 m->m_pkthdr.rcvif = NULL; 401 eh = mtod(m, struct ether_header *); 402 m_adj(m, ETHER_HDR_LEN); 403 m = bdg_forward_ptr(m, eh, ifp); 404 if (m != NULL) 405 m_freem(m); 406 return (0); 407 } 408 409 no_bridge: 410 s = splimp(); 411 if (IPFW_LOADED && ether_ipfw != 0) { 412 struct ether_header save_eh, *eh; 413 414 eh = mtod(m, struct ether_header *); 415 save_eh = *eh; 416 m_adj(m, ETHER_HDR_LEN); 417 if (ether_ipfw_chk(&m, ifp, &rule, eh, 0) == 0) { 418 if (m) { 419 m_freem(m); 420 return ENOBUFS; /* pkt dropped */ 421 } else 422 return 0; /* consumed e.g. in a pipe */ 423 } 424 /* packet was ok, restore the ethernet header */ 425 if ( (void *)(eh + 1) == (void *)m->m_data) { 426 m->m_data -= ETHER_HDR_LEN ; 427 m->m_len += ETHER_HDR_LEN ; 428 m->m_pkthdr.len += ETHER_HDR_LEN ; 429 } else { 430 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 431 if (m == NULL) /* nope... */ 432 return ENOBUFS; 433 bcopy(&save_eh, mtod(m, struct ether_header *), 434 ETHER_HDR_LEN); 435 } 436 } 437 438 /* 439 * Queue message on interface, update output statistics if 440 * successful, and start output if interface not yet active. 441 */ 442 if (!IF_HANDOFF(&ifp->if_snd, m, ifp)) 443 error = ENOBUFS; 444 splx(s); 445 return (error); 446 } 447 448 /* 449 * ipfw processing for ethernet packets (in and out). 450 * The second parameter is NULL from ether_demux, and ifp from 451 * ether_output_frame. This section of code could be used from 452 * bridge.c as well as long as we use some extra info 453 * to distinguish that case from ether_output_frame(); 454 */ 455 int 456 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 457 struct ip_fw **rule, struct ether_header *eh, int shared) 458 { 459 struct ether_header save_eh = *eh; /* might be a ptr in m */ 460 int i; 461 struct ip_fw_args args; 462 463 if (*rule != NULL && fw_one_pass) 464 return 1; /* dummynet packet, already partially processed */ 465 466 /* 467 * I need some amt of data to be contiguous, and in case others need 468 * the packet (shared==1) also better be in the first mbuf. 469 */ 470 i = min( (*m0)->m_pkthdr.len, max_protohdr); 471 if ( shared || (*m0)->m_len < i) { 472 *m0 = m_pullup(*m0, i); 473 if (*m0 == NULL) 474 return 0; 475 } 476 477 args.m = *m0; /* the packet we are looking at */ 478 args.oif = dst; /* destination, if any */ 479 args.divert_rule = 0; /* we do not support divert yet */ 480 args.rule = *rule; /* matching rule to restart */ 481 args.next_hop = NULL; /* we do not support forward yet */ 482 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 483 i = ip_fw_chk_ptr(&args); 484 *m0 = args.m; 485 *rule = args.rule; 486 487 if ( (i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */ 488 return 0; 489 490 if (i == 0) /* a PASS rule. */ 491 return 1; 492 493 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) { 494 /* 495 * Pass the pkt to dummynet, which consumes it. 496 * If shared, make a copy and keep the original. 497 */ 498 struct mbuf *m ; 499 500 if (shared) { 501 m = m_copypacket(*m0, MB_DONTWAIT); 502 if (m == NULL) 503 return 0; 504 } else { 505 m = *m0 ; /* pass the original to dummynet */ 506 *m0 = NULL ; /* and nothing back to the caller */ 507 } 508 /* 509 * Prepend the header, optimize for the common case of 510 * eh pointing into the mbuf. 511 */ 512 if ( (void *)(eh + 1) == (void *)m->m_data) { 513 m->m_data -= ETHER_HDR_LEN ; 514 m->m_len += ETHER_HDR_LEN ; 515 m->m_pkthdr.len += ETHER_HDR_LEN ; 516 } else { 517 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 518 if (m == NULL) /* nope... */ 519 return 0; 520 bcopy(&save_eh, mtod(m, struct ether_header *), 521 ETHER_HDR_LEN); 522 } 523 ip_dn_io_ptr(m, (i & 0xffff), 524 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 525 return 0; 526 } 527 /* 528 * XXX at some point add support for divert/forward actions. 529 * If none of the above matches, we have to drop the pkt. 530 */ 531 return 0; 532 } 533 534 /* 535 * XXX merge this function with ether_input. 536 */ 537 static void 538 ether_input_internal(struct ifnet *ifp, struct mbuf *m) 539 { 540 ether_input(ifp, NULL, m); 541 } 542 543 /* 544 * Process a received Ethernet packet. We have two different interfaces: 545 * one (conventional) assumes the packet in the mbuf, with the ethernet 546 * header provided separately in *eh. The second one (new) has everything 547 * in the mbuf, and we can tell it because eh == NULL. 548 * The caller MUST MAKE SURE that there are at least 549 * sizeof(struct ether_header) bytes in the first mbuf. 550 * 551 * This allows us to concentrate in one place a bunch of code which 552 * is replicated in all device drivers. Also, many functions called 553 * from ether_input() try to put the eh back into the mbuf, so we 554 * can later propagate the 'contiguous packet' interface to them, 555 * and handle the old interface just here. 556 * 557 * NOTA BENE: for many drivers "eh" is a pointer into the first mbuf or 558 * cluster, right before m_data. So be very careful when working on m, 559 * as you could destroy *eh !! 560 * 561 * First we perform any link layer operations, then continue 562 * to the upper layers with ether_demux(). 563 */ 564 void 565 ether_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 566 { 567 struct ether_header save_eh; 568 569 if (eh == NULL) { 570 if (m->m_len < sizeof(struct ether_header)) { 571 /* XXX error in the caller. */ 572 m_freem(m); 573 return; 574 } 575 m->m_pkthdr.rcvif = ifp; 576 eh = mtod(m, struct ether_header *); 577 m_adj(m, sizeof(struct ether_header)); 578 /* XXX */ 579 /* m->m_pkthdr.len = m->m_len; */ 580 } 581 582 /* Check for a BPF tap */ 583 if (ifp->if_bpf != NULL) { 584 struct m_hdr mh; 585 586 /* This kludge is OK; BPF treats the "mbuf" as read-only */ 587 mh.mh_next = m; 588 mh.mh_data = (char *)eh; 589 mh.mh_len = ETHER_HDR_LEN; 590 bpf_mtap(ifp, (struct mbuf *)&mh); 591 } 592 593 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 594 595 /* Handle ng_ether(4) processing, if any */ 596 if (ng_ether_input_p != NULL) { 597 (*ng_ether_input_p)(ifp, &m, eh); 598 if (m == NULL) 599 return; 600 } 601 602 /* Check for bridging mode */ 603 if (BDG_ACTIVE(ifp) ) { 604 struct ifnet *bif; 605 606 /* Check with bridging code */ 607 if ((bif = bridge_in_ptr(ifp, eh)) == BDG_DROP) { 608 m_freem(m); 609 return; 610 } 611 if (bif != BDG_LOCAL) { 612 save_eh = *eh ; /* because it might change */ 613 m = bdg_forward_ptr(m, eh, bif); /* needs forwarding */ 614 /* 615 * Do not continue if bdg_forward_ptr() processed our 616 * packet (and cleared the mbuf pointer m) or if 617 * it dropped (m_free'd) the packet itself. 618 */ 619 if (m == NULL) { 620 if (bif == BDG_BCAST || bif == BDG_MCAST) 621 printf("bdg_forward drop MULTICAST PKT\n"); 622 return; 623 } 624 eh = &save_eh ; 625 } 626 if (bif == BDG_LOCAL 627 || bif == BDG_BCAST 628 || bif == BDG_MCAST) 629 goto recvLocal; /* receive locally */ 630 631 /* If not local and not multicast, just drop it */ 632 if (m != NULL) 633 m_freem(m); 634 return; 635 } 636 637 recvLocal: 638 /* Continue with upper layer processing */ 639 ether_demux(ifp, eh, m); 640 } 641 642 /* 643 * Upper layer processing for a received Ethernet packet. 644 */ 645 void 646 ether_demux(ifp, eh, m) 647 struct ifnet *ifp; 648 struct ether_header *eh; 649 struct mbuf *m; 650 { 651 int isr; 652 u_short ether_type; 653 #if defined(NETATALK) 654 struct llc *l; 655 #endif 656 struct ip_fw *rule = NULL; 657 658 /* Extract info from dummynet tag, ignore others */ 659 for (;m->m_type == MT_TAG; m = m->m_next) 660 if (m->m_flags == PACKET_TAG_DUMMYNET) { 661 rule = ((struct dn_pkt *)m)->rule; 662 ifp = m->m_next->m_pkthdr.rcvif; 663 } 664 665 if (rule) /* packet was already bridged */ 666 goto post_stats; 667 668 if (! (BDG_ACTIVE(ifp) ) ) 669 /* Discard packet if upper layers shouldn't see it because it was 670 unicast to a different Ethernet address. If the driver is working 671 properly, then this situation can only happen when the interface 672 is in promiscuous mode. */ 673 if ((ifp->if_flags & IFF_PROMISC) != 0 674 && (eh->ether_dhost[0] & 1) == 0 675 && bcmp(eh->ether_dhost, 676 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0 677 && (ifp->if_flags & IFF_PPROMISC) == 0) { 678 m_freem(m); 679 return; 680 } 681 682 /* Discard packet if interface is not up */ 683 if ((ifp->if_flags & IFF_UP) == 0) { 684 m_freem(m); 685 return; 686 } 687 if (eh->ether_dhost[0] & 1) { 688 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost, 689 ifp->if_addrlen) == 0) 690 m->m_flags |= M_BCAST; 691 else 692 m->m_flags |= M_MCAST; 693 } 694 if (m->m_flags & (M_BCAST|M_MCAST)) 695 ifp->if_imcasts++; 696 697 post_stats: 698 if (IPFW_LOADED && ether_ipfw != 0) { 699 if (ether_ipfw_chk(&m, NULL, &rule, eh, 0 ) == 0) { 700 if (m) 701 m_freem(m); 702 return; 703 } 704 } 705 706 ether_type = ntohs(eh->ether_type); 707 708 switch (ether_type) { 709 #ifdef INET 710 case ETHERTYPE_IP: 711 if (ipflow_fastforward(m)) 712 return; 713 isr = NETISR_IP; 714 break; 715 716 case ETHERTYPE_ARP: 717 if (ifp->if_flags & IFF_NOARP) { 718 /* Discard packet if ARP is disabled on interface */ 719 m_freem(m); 720 return; 721 } 722 isr = NETISR_ARP; 723 break; 724 #endif 725 #ifdef IPX 726 case ETHERTYPE_IPX: 727 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 728 return; 729 isr = NETISR_IPX; 730 break; 731 #endif 732 #ifdef INET6 733 case ETHERTYPE_IPV6: 734 isr = NETISR_IPV6; 735 break; 736 #endif 737 #ifdef NS 738 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 739 isr = NETISR_NS; 740 break; 741 742 #endif /* NS */ 743 #ifdef NETATALK 744 case ETHERTYPE_AT: 745 isr = NETISR_ATALK1; 746 break; 747 case ETHERTYPE_AARP: 748 isr = NETISR_AARP; 749 break; 750 #endif /* NETATALK */ 751 case ETHERTYPE_VLAN: 752 /* XXX lock ? */ 753 if (vlan_input_p != NULL) 754 (*vlan_input_p)(eh, m); 755 else { 756 m->m_pkthdr.rcvif->if_noproto++; 757 m_freem(m); 758 } 759 /* XXX unlock ? */ 760 return; 761 default: 762 #ifdef IPX 763 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 764 return; 765 #endif /* IPX */ 766 #ifdef NS 767 checksum = mtod(m, ushort *); 768 /* Novell 802.3 */ 769 if ((ether_type <= ETHERMTU) && 770 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) { 771 if (*checksum == 0xE0E0) { 772 m->m_pkthdr.len -= 3; 773 m->m_len -= 3; 774 m->m_data += 3; 775 } 776 isr = NETISR_NS; 777 break; 778 } 779 #endif /* NS */ 780 #ifdef NETATALK 781 if (ether_type > ETHERMTU) 782 goto dropanyway; 783 l = mtod(m, struct llc *); 784 if (l->llc_dsap == LLC_SNAP_LSAP && 785 l->llc_ssap == LLC_SNAP_LSAP && 786 l->llc_control == LLC_UI) { 787 if (Bcmp(&(l->llc_snap_org_code)[0], at_org_code, 788 sizeof(at_org_code)) == 0 && 789 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 790 m_adj(m, sizeof(struct llc)); 791 isr = NETISR_ATALK2; 792 break; 793 } 794 if (Bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 795 sizeof(aarp_org_code)) == 0 && 796 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 797 m_adj(m, sizeof(struct llc)); 798 isr = NETISR_AARP; 799 break; 800 } 801 } 802 dropanyway: 803 #endif /* NETATALK */ 804 if (ng_ether_input_orphan_p != NULL) 805 (*ng_ether_input_orphan_p)(ifp, m, eh); 806 else 807 m_freem(m); 808 return; 809 } 810 netisr_dispatch(isr, m); 811 } 812 813 /* 814 * Perform common duties while attaching to interface list 815 */ 816 817 void 818 ether_ifattach(struct ifnet *ifp, uint8_t *lla) 819 { 820 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header)); 821 } 822 823 void 824 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen) 825 { 826 struct ifaddr *ifa; 827 struct sockaddr_dl *sdl; 828 829 ifp->if_output = ether_output; 830 ifp->if_input = ether_input_internal; 831 ifp->if_type = IFT_ETHER; 832 ifp->if_addrlen = ETHER_ADDR_LEN; 833 ifp->if_broadcastaddr = etherbroadcastaddr; 834 ifp->if_hdrlen = 14; 835 if_attach(ifp); 836 ifp->if_mtu = ETHERMTU; 837 ifp->if_resolvemulti = ether_resolvemulti; 838 if (ifp->if_baudrate == 0) 839 ifp->if_baudrate = 10000000; 840 ifa = ifnet_addrs[ifp->if_index - 1]; 841 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__)); 842 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 843 sdl->sdl_type = IFT_ETHER; 844 sdl->sdl_alen = ifp->if_addrlen; 845 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 846 /* 847 * XXX Keep the current drivers happy. 848 * XXX Remove once all drivers have been cleaned up 849 */ 850 if (lla != IFP2AC(ifp)->ac_enaddr) 851 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 852 bpfattach(ifp, dlt, hdrlen); 853 if (ng_ether_attach_p != NULL) 854 (*ng_ether_attach_p)(ifp); 855 if (BDG_LOADED) 856 bdgtakeifaces_ptr(); 857 858 if_printf(ifp, "MAC address: %6D\n", lla, ":"); 859 } 860 861 /* 862 * Perform common duties while detaching an Ethernet interface 863 */ 864 void 865 ether_ifdetach(struct ifnet *ifp) 866 { 867 int s; 868 869 s = splnet(); 870 if_down(ifp); 871 splx(s); 872 873 if (ng_ether_detach_p != NULL) 874 (*ng_ether_detach_p)(ifp); 875 bpfdetach(ifp); 876 if_detach(ifp); 877 if (BDG_LOADED) 878 bdgtakeifaces_ptr(); 879 } 880 881 SYSCTL_DECL(_net_link); 882 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 883 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 884 ðer_ipfw,0,"Pass ether pkts through firewall"); 885 886 int 887 ether_ioctl(ifp, command, data) 888 struct ifnet *ifp; 889 int command; 890 caddr_t data; 891 { 892 struct ifaddr *ifa = (struct ifaddr *) data; 893 struct ifreq *ifr = (struct ifreq *) data; 894 int error = 0; 895 896 switch (command) { 897 case SIOCSIFADDR: 898 ifp->if_flags |= IFF_UP; 899 900 switch (ifa->ifa_addr->sa_family) { 901 #ifdef INET 902 case AF_INET: 903 ifp->if_init(ifp->if_softc); /* before arpwhohas */ 904 arp_ifinit(ifp, ifa); 905 break; 906 #endif 907 #ifdef IPX 908 /* 909 * XXX - This code is probably wrong 910 */ 911 case AF_IPX: 912 { 913 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); 914 struct arpcom *ac = IFP2AC(ifp); 915 916 if (ipx_nullhost(*ina)) 917 ina->x_host = 918 *(union ipx_host *) 919 ac->ac_enaddr; 920 else { 921 bcopy((caddr_t) ina->x_host.c_host, 922 (caddr_t) ac->ac_enaddr, 923 sizeof(ac->ac_enaddr)); 924 } 925 926 /* 927 * Set new address 928 */ 929 ifp->if_init(ifp->if_softc); 930 break; 931 } 932 #endif 933 #ifdef NS 934 /* 935 * XXX - This code is probably wrong 936 */ 937 case AF_NS: 938 { 939 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr); 940 struct arpcom *ac = IFP2AC(ifp); 941 942 if (ns_nullhost(*ina)) 943 ina->x_host = 944 *(union ns_host *) (ac->ac_enaddr); 945 else { 946 bcopy((caddr_t) ina->x_host.c_host, 947 (caddr_t) ac->ac_enaddr, 948 sizeof(ac->ac_enaddr)); 949 } 950 951 /* 952 * Set new address 953 */ 954 ifp->if_init(ifp->if_softc); 955 break; 956 } 957 #endif 958 default: 959 ifp->if_init(ifp->if_softc); 960 break; 961 } 962 break; 963 964 case SIOCGIFADDR: 965 { 966 struct sockaddr *sa; 967 968 sa = (struct sockaddr *) & ifr->ifr_data; 969 bcopy(IFP2AC(ifp)->ac_enaddr, 970 (caddr_t) sa->sa_data, ETHER_ADDR_LEN); 971 } 972 break; 973 974 case SIOCSIFMTU: 975 /* 976 * Set the interface MTU. 977 */ 978 if (ifr->ifr_mtu > ETHERMTU) { 979 error = EINVAL; 980 } else { 981 ifp->if_mtu = ifr->ifr_mtu; 982 } 983 break; 984 default: 985 error = EINVAL; 986 break; 987 } 988 return (error); 989 } 990 991 int 992 ether_resolvemulti(ifp, llsa, sa) 993 struct ifnet *ifp; 994 struct sockaddr **llsa; 995 struct sockaddr *sa; 996 { 997 struct sockaddr_dl *sdl; 998 struct sockaddr_in *sin; 999 #ifdef INET6 1000 struct sockaddr_in6 *sin6; 1001 #endif 1002 u_char *e_addr; 1003 1004 switch(sa->sa_family) { 1005 case AF_LINK: 1006 /* 1007 * No mapping needed. Just check that it's a valid MC address. 1008 */ 1009 sdl = (struct sockaddr_dl *)sa; 1010 e_addr = LLADDR(sdl); 1011 if ((e_addr[0] & 1) != 1) 1012 return EADDRNOTAVAIL; 1013 *llsa = 0; 1014 return 0; 1015 1016 #ifdef INET 1017 case AF_INET: 1018 sin = (struct sockaddr_in *)sa; 1019 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 1020 return EADDRNOTAVAIL; 1021 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1022 M_WAITOK|M_ZERO); 1023 sdl->sdl_len = sizeof *sdl; 1024 sdl->sdl_family = AF_LINK; 1025 sdl->sdl_index = ifp->if_index; 1026 sdl->sdl_type = IFT_ETHER; 1027 sdl->sdl_alen = ETHER_ADDR_LEN; 1028 e_addr = LLADDR(sdl); 1029 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 1030 *llsa = (struct sockaddr *)sdl; 1031 return 0; 1032 #endif 1033 #ifdef INET6 1034 case AF_INET6: 1035 sin6 = (struct sockaddr_in6 *)sa; 1036 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1037 /* 1038 * An IP6 address of 0 means listen to all 1039 * of the Ethernet multicast address used for IP6. 1040 * (This is used for multicast routers.) 1041 */ 1042 ifp->if_flags |= IFF_ALLMULTI; 1043 *llsa = 0; 1044 return 0; 1045 } 1046 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1047 return EADDRNOTAVAIL; 1048 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1049 M_WAITOK|M_ZERO); 1050 sdl->sdl_len = sizeof *sdl; 1051 sdl->sdl_family = AF_LINK; 1052 sdl->sdl_index = ifp->if_index; 1053 sdl->sdl_type = IFT_ETHER; 1054 sdl->sdl_alen = ETHER_ADDR_LEN; 1055 e_addr = LLADDR(sdl); 1056 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1057 *llsa = (struct sockaddr *)sdl; 1058 return 0; 1059 #endif 1060 1061 default: 1062 /* 1063 * Well, the text isn't quite right, but it's the name 1064 * that counts... 1065 */ 1066 return EAFNOSUPPORT; 1067 } 1068 } 1069 1070 #if 0 1071 /* 1072 * This is for reference. We have a table-driven version 1073 * of the little-endian crc32 generator, which is faster 1074 * than the double-loop. 1075 */ 1076 uint32_t 1077 ether_crc32_le(const uint8_t *buf, size_t len) 1078 { 1079 uint32_t c, crc, carry; 1080 size_t i, j; 1081 1082 crc = 0xffffffffU; /* initial value */ 1083 1084 for (i = 0; i < len; i++) { 1085 c = buf[i]; 1086 for (j = 0; j < 8; j++) { 1087 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1088 crc >>= 1; 1089 c >>= 1; 1090 if (carry) 1091 crc = (crc ^ ETHER_CRC_POLY_LE); 1092 } 1093 } 1094 1095 return(crc); 1096 } 1097 #else 1098 uint32_t 1099 ether_crc32_le(const uint8_t *buf, size_t len) 1100 { 1101 static const uint32_t crctab[] = { 1102 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1103 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1104 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1105 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1106 }; 1107 uint32_t crc; 1108 size_t i; 1109 1110 crc = 0xffffffffU; /* initial value */ 1111 1112 for (i = 0; i < len; i++) { 1113 crc ^= buf[i]; 1114 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1115 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1116 } 1117 1118 return(crc); 1119 } 1120 #endif 1121 1122 uint32_t 1123 ether_crc32_be(const uint8_t *buf, size_t len) 1124 { 1125 uint32_t c, crc, carry; 1126 size_t i, j; 1127 1128 crc = 0xffffffffU; /* initial value */ 1129 1130 for (i = 0; i < len; i++) { 1131 c = buf[i]; 1132 for (j = 0; j < 8; j++) { 1133 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1134 crc <<= 1; 1135 c >>= 1; 1136 if (carry) 1137 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1138 } 1139 } 1140 1141 return(crc); 1142 } 1143