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 1.6 2003/08/07 21:54:30 dillon 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 ether_header *eh, struct mbuf *m, 114 u_int16_t t); 115 116 /* bridge support */ 117 int do_bridge; 118 bridge_in_t *bridge_in_ptr; 119 bdg_forward_t *bdg_forward_ptr; 120 bdgtakeifaces_t *bdgtakeifaces_ptr; 121 struct bdg_softc *ifp2sc; 122 123 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 124 struct sockaddr *); 125 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 126 #define senderr(e) do { error = (e); goto bad;} while (0) 127 #define IFP2AC(IFP) ((struct arpcom *)IFP) 128 129 int 130 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 131 struct ip_fw **rule, struct ether_header *eh, int shared); 132 static int ether_ipfw; 133 134 /* 135 * Ethernet output routine. 136 * Encapsulate a packet of type family for the local net. 137 * Use trailer local net encapsulation if enough data in first 138 * packet leaves a multiple of 512 bytes of data in remainder. 139 * Assumes that ifp is actually pointer to arpcom structure. 140 */ 141 int 142 ether_output(ifp, m, dst, rt0) 143 struct ifnet *ifp; 144 struct mbuf *m; 145 struct sockaddr *dst; 146 struct rtentry *rt0; 147 { 148 short type; 149 int error = 0, hdrcmplt = 0; 150 u_char esrc[6], edst[6]; 151 struct rtentry *rt; 152 struct ether_header *eh; 153 int loop_copy = 0; 154 int hlen; /* link layer header lenght */ 155 struct arpcom *ac = IFP2AC(ifp); 156 157 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 158 senderr(ENETDOWN); 159 rt = rt0; 160 if (rt) { 161 if ((rt->rt_flags & RTF_UP) == 0) { 162 rt0 = rt = rtalloc1(dst, 1, 0UL); 163 if (rt0) 164 rt->rt_refcnt--; 165 else 166 senderr(EHOSTUNREACH); 167 } 168 if (rt->rt_flags & RTF_GATEWAY) { 169 if (rt->rt_gwroute == 0) 170 goto lookup; 171 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 172 rtfree(rt); rt = rt0; 173 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 174 0UL); 175 if ((rt = rt->rt_gwroute) == 0) 176 senderr(EHOSTUNREACH); 177 } 178 } 179 if (rt->rt_flags & RTF_REJECT) 180 if (rt->rt_rmx.rmx_expire == 0 || 181 time_second < rt->rt_rmx.rmx_expire) 182 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 183 } 184 hlen = ETHER_HDR_LEN; 185 switch (dst->sa_family) { 186 #ifdef INET 187 case AF_INET: 188 if (!arpresolve(ifp, rt, m, dst, edst, rt0)) 189 return (0); /* if not yet resolved */ 190 type = htons(ETHERTYPE_IP); 191 break; 192 #endif 193 #ifdef INET6 194 case AF_INET6: 195 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) { 196 /* Something bad happened */ 197 return(0); 198 } 199 type = htons(ETHERTYPE_IPV6); 200 break; 201 #endif 202 #ifdef IPX 203 case AF_IPX: 204 if (ef_outputp) { 205 error = ef_outputp(ifp, &m, dst, &type, &hlen); 206 if (error) 207 goto bad; 208 } else 209 type = htons(ETHERTYPE_IPX); 210 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 211 (caddr_t)edst, sizeof (edst)); 212 break; 213 #endif 214 #ifdef NETATALK 215 case AF_APPLETALK: 216 { 217 struct at_ifaddr *aa; 218 219 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { 220 goto bad; 221 } 222 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) 223 return (0); 224 /* 225 * In the phase 2 case, need to prepend an mbuf for the llc header. 226 * Since we must preserve the value of m, which is passed to us by 227 * value, we m_copy() the first mbuf, and use it for our llc header. 228 */ 229 if ( aa->aa_flags & AFA_PHASE2 ) { 230 struct llc llc; 231 232 M_PREPEND(m, sizeof(struct llc), M_WAIT); 233 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 234 llc.llc_control = LLC_UI; 235 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); 236 llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); 237 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 238 type = htons(m->m_pkthdr.len); 239 hlen = sizeof(struct llc) + ETHER_HDR_LEN; 240 } else { 241 type = htons(ETHERTYPE_AT); 242 } 243 break; 244 } 245 #endif /* NETATALK */ 246 #ifdef NS 247 case AF_NS: 248 switch(ns_nettype){ 249 default: 250 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 251 type = 0x8137; 252 break; 253 case 0x0: /* Novell 802.3 */ 254 type = htons( m->m_pkthdr.len); 255 break; 256 case 0xe0e0: /* Novell 802.2 and Token-Ring */ 257 M_PREPEND(m, 3, M_WAIT); 258 type = htons( m->m_pkthdr.len); 259 cp = mtod(m, u_char *); 260 *cp++ = 0xE0; 261 *cp++ = 0xE0; 262 *cp++ = 0x03; 263 break; 264 } 265 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 266 (caddr_t)edst, sizeof (edst)); 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((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))){ 274 m->m_pkthdr.rcvif = ifp; 275 inq = &nsintrq; 276 if (IF_HANDOFF(inq, m, NULL)) 277 schednetisr(NETISR_NS); 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%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, 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), M_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, M_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, M_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, M_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 * Process a received Ethernet packet. We have two different interfaces: 536 * one (conventional) assumes the packet in the mbuf, with the ethernet 537 * header provided separately in *eh. The second one (new) has everything 538 * in the mbuf, and we can tell it because eh == NULL. 539 * The caller MUST MAKE SURE that there are at least 540 * sizeof(struct ether_header) bytes in the first mbuf. 541 * 542 * This allows us to concentrate in one place a bunch of code which 543 * is replicated in all device drivers. Also, many functions called 544 * from ether_input() try to put the eh back into the mbuf, so we 545 * can later propagate the 'contiguous packet' interface to them, 546 * and handle the old interface just here. 547 * 548 * NOTA BENE: for many drivers "eh" is a pointer into the first mbuf or 549 * cluster, right before m_data. So be very careful when working on m, 550 * as you could destroy *eh !! 551 * 552 * First we perform any link layer operations, then continue 553 * to the upper layers with ether_demux(). 554 */ 555 void 556 ether_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 557 { 558 struct ether_header save_eh; 559 560 if (eh == NULL) { 561 if (m->m_len < sizeof(struct ether_header)) { 562 /* XXX error in the caller. */ 563 m_freem(m); 564 return; 565 } 566 m->m_pkthdr.rcvif = ifp; 567 eh = mtod(m, struct ether_header *); 568 m->m_data += sizeof(struct ether_header); 569 m->m_len -= sizeof(struct ether_header); 570 m->m_pkthdr.len = m->m_len; 571 } 572 573 /* Check for a BPF tap */ 574 if (ifp->if_bpf != NULL) { 575 struct m_hdr mh; 576 577 /* This kludge is OK; BPF treats the "mbuf" as read-only */ 578 mh.mh_next = m; 579 mh.mh_data = (char *)eh; 580 mh.mh_len = ETHER_HDR_LEN; 581 bpf_mtap(ifp, (struct mbuf *)&mh); 582 } 583 584 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 585 586 /* Handle ng_ether(4) processing, if any */ 587 if (ng_ether_input_p != NULL) { 588 (*ng_ether_input_p)(ifp, &m, eh); 589 if (m == NULL) 590 return; 591 } 592 593 /* Check for bridging mode */ 594 if (BDG_ACTIVE(ifp) ) { 595 struct ifnet *bif; 596 597 /* Check with bridging code */ 598 if ((bif = bridge_in_ptr(ifp, eh)) == BDG_DROP) { 599 m_freem(m); 600 return; 601 } 602 if (bif != BDG_LOCAL) { 603 save_eh = *eh ; /* because it might change */ 604 m = bdg_forward_ptr(m, eh, bif); /* needs forwarding */ 605 /* 606 * Do not continue if bdg_forward_ptr() processed our 607 * packet (and cleared the mbuf pointer m) or if 608 * it dropped (m_free'd) the packet itself. 609 */ 610 if (m == NULL) { 611 if (bif == BDG_BCAST || bif == BDG_MCAST) 612 printf("bdg_forward drop MULTICAST PKT\n"); 613 return; 614 } 615 eh = &save_eh ; 616 } 617 if (bif == BDG_LOCAL 618 || bif == BDG_BCAST 619 || bif == BDG_MCAST) 620 goto recvLocal; /* receive locally */ 621 622 /* If not local and not multicast, just drop it */ 623 if (m != NULL) 624 m_freem(m); 625 return; 626 } 627 628 recvLocal: 629 /* Continue with upper layer processing */ 630 ether_demux(ifp, eh, m); 631 } 632 633 /* 634 * Upper layer processing for a received Ethernet packet. 635 */ 636 void 637 ether_demux(ifp, eh, m) 638 struct ifnet *ifp; 639 struct ether_header *eh; 640 struct mbuf *m; 641 { 642 struct ifqueue *inq; 643 u_short ether_type; 644 #if defined(NETATALK) 645 struct llc *l; 646 #endif 647 struct ip_fw *rule = NULL; 648 649 /* Extract info from dummynet tag, ignore others */ 650 for (;m->m_type == MT_TAG; m = m->m_next) 651 if (m->m_flags == PACKET_TAG_DUMMYNET) { 652 rule = ((struct dn_pkt *)m)->rule; 653 ifp = m->m_next->m_pkthdr.rcvif; 654 } 655 656 if (rule) /* packet was already bridged */ 657 goto post_stats; 658 659 if (! (BDG_ACTIVE(ifp) ) ) 660 /* Discard packet if upper layers shouldn't see it because it was 661 unicast to a different Ethernet address. If the driver is working 662 properly, then this situation can only happen when the interface 663 is in promiscuous mode. */ 664 if ((ifp->if_flags & IFF_PROMISC) != 0 665 && (eh->ether_dhost[0] & 1) == 0 666 && bcmp(eh->ether_dhost, 667 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0 668 && (ifp->if_ipending & IFF_PPROMISC) == 0) { 669 m_freem(m); 670 return; 671 } 672 673 /* Discard packet if interface is not up */ 674 if ((ifp->if_flags & IFF_UP) == 0) { 675 m_freem(m); 676 return; 677 } 678 if (eh->ether_dhost[0] & 1) { 679 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 680 sizeof(etherbroadcastaddr)) == 0) 681 m->m_flags |= M_BCAST; 682 else 683 m->m_flags |= M_MCAST; 684 } 685 if (m->m_flags & (M_BCAST|M_MCAST)) 686 ifp->if_imcasts++; 687 688 post_stats: 689 if (IPFW_LOADED && ether_ipfw != 0) { 690 if (ether_ipfw_chk(&m, NULL, &rule, eh, 0 ) == 0) { 691 if (m) 692 m_freem(m); 693 return; 694 } 695 } 696 697 ether_type = ntohs(eh->ether_type); 698 699 switch (ether_type) { 700 #ifdef INET 701 case ETHERTYPE_IP: 702 if (ipflow_fastforward(m)) 703 return; 704 schednetisr(NETISR_IP); 705 inq = &ipintrq; 706 break; 707 708 case ETHERTYPE_ARP: 709 if (ifp->if_flags & IFF_NOARP) { 710 /* Discard packet if ARP is disabled on interface */ 711 m_freem(m); 712 return; 713 } 714 schednetisr(NETISR_ARP); 715 inq = &arpintrq; 716 break; 717 #endif 718 #ifdef IPX 719 case ETHERTYPE_IPX: 720 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 721 return; 722 schednetisr(NETISR_IPX); 723 inq = &ipxintrq; 724 break; 725 #endif 726 #ifdef INET6 727 case ETHERTYPE_IPV6: 728 schednetisr(NETISR_IPV6); 729 inq = &ip6intrq; 730 break; 731 #endif 732 #ifdef NS 733 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 734 schednetisr(NETISR_NS); 735 inq = &nsintrq; 736 break; 737 738 #endif /* NS */ 739 #ifdef NETATALK 740 case ETHERTYPE_AT: 741 schednetisr(NETISR_ATALK); 742 inq = &atintrq1; 743 break; 744 case ETHERTYPE_AARP: 745 /* probably this should be done with a NETISR as well */ 746 aarpinput(IFP2AC(ifp), m); /* XXX */ 747 return; 748 #endif /* NETATALK */ 749 case ETHERTYPE_VLAN: 750 /* XXX lock ? */ 751 if (vlan_input_p != NULL) 752 (*vlan_input_p)(eh, m); 753 else { 754 m->m_pkthdr.rcvif->if_noproto++; 755 m_freem(m); 756 } 757 /* XXX unlock ? */ 758 return; 759 default: 760 #ifdef IPX 761 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 762 return; 763 #endif /* IPX */ 764 #ifdef NS 765 checksum = mtod(m, ushort *); 766 /* Novell 802.3 */ 767 if ((ether_type <= ETHERMTU) && 768 ((*checksum == 0xffff) || (*checksum == 0xE0E0))){ 769 if(*checksum == 0xE0E0) { 770 m->m_pkthdr.len -= 3; 771 m->m_len -= 3; 772 m->m_data += 3; 773 } 774 schednetisr(NETISR_NS); 775 inq = &nsintrq; 776 break; 777 } 778 #endif /* NS */ 779 #if defined(NETATALK) 780 if (ether_type > ETHERMTU) 781 goto dropanyway; 782 l = mtod(m, struct llc *); 783 switch (l->llc_dsap) { 784 case LLC_SNAP_LSAP: 785 switch (l->llc_control) { 786 case LLC_UI: 787 if (l->llc_ssap != LLC_SNAP_LSAP) 788 goto dropanyway; 789 790 if (Bcmp(&(l->llc_snap_org_code)[0], at_org_code, 791 sizeof(at_org_code)) == 0 && 792 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 793 inq = &atintrq2; 794 m_adj( m, sizeof( struct llc )); 795 schednetisr(NETISR_ATALK); 796 break; 797 } 798 799 if (Bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 800 sizeof(aarp_org_code)) == 0 && 801 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 802 m_adj( m, sizeof( struct llc )); 803 aarpinput(IFP2AC(ifp), m); /* XXX */ 804 return; 805 } 806 807 default: 808 goto dropanyway; 809 } 810 break; 811 dropanyway: 812 default: 813 if (ng_ether_input_orphan_p != NULL) 814 (*ng_ether_input_orphan_p)(ifp, m, eh); 815 else 816 m_freem(m); 817 return; 818 } 819 #else /* NETATALK */ 820 if (ng_ether_input_orphan_p != NULL) 821 (*ng_ether_input_orphan_p)(ifp, m, eh); 822 else 823 m_freem(m); 824 return; 825 #endif /* NETATALK */ 826 } 827 828 (void) IF_HANDOFF(inq, m, NULL); 829 } 830 831 /* 832 * Perform common duties while attaching to interface list 833 */ 834 void 835 ether_ifattach(ifp, bpf) 836 struct ifnet *ifp; 837 int bpf; 838 { 839 struct ifaddr *ifa; 840 struct sockaddr_dl *sdl; 841 842 ifp->if_type = IFT_ETHER; 843 ifp->if_addrlen = 6; 844 ifp->if_hdrlen = 14; 845 if_attach(ifp); 846 ifp->if_mtu = ETHERMTU; 847 ifp->if_resolvemulti = ether_resolvemulti; 848 if (ifp->if_baudrate == 0) 849 ifp->if_baudrate = 10000000; 850 ifa = ifnet_addrs[ifp->if_index - 1]; 851 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__)); 852 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 853 sdl->sdl_type = IFT_ETHER; 854 sdl->sdl_alen = ifp->if_addrlen; 855 bcopy((IFP2AC(ifp))->ac_enaddr, LLADDR(sdl), ifp->if_addrlen); 856 if (bpf) 857 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 858 if (ng_ether_attach_p != NULL) 859 (*ng_ether_attach_p)(ifp); 860 if (BDG_LOADED) 861 bdgtakeifaces_ptr(); 862 } 863 864 /* 865 * Perform common duties while detaching an Ethernet interface 866 */ 867 void 868 ether_ifdetach(ifp, bpf) 869 struct ifnet *ifp; 870 int bpf; 871 { 872 if (ng_ether_detach_p != NULL) 873 (*ng_ether_detach_p)(ifp); 874 if (bpf) 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 } 985 return (error); 986 } 987 988 int 989 ether_resolvemulti(ifp, llsa, sa) 990 struct ifnet *ifp; 991 struct sockaddr **llsa; 992 struct sockaddr *sa; 993 { 994 struct sockaddr_dl *sdl; 995 struct sockaddr_in *sin; 996 #ifdef INET6 997 struct sockaddr_in6 *sin6; 998 #endif 999 u_char *e_addr; 1000 1001 switch(sa->sa_family) { 1002 case AF_LINK: 1003 /* 1004 * No mapping needed. Just check that it's a valid MC address. 1005 */ 1006 sdl = (struct sockaddr_dl *)sa; 1007 e_addr = LLADDR(sdl); 1008 if ((e_addr[0] & 1) != 1) 1009 return EADDRNOTAVAIL; 1010 *llsa = 0; 1011 return 0; 1012 1013 #ifdef INET 1014 case AF_INET: 1015 sin = (struct sockaddr_in *)sa; 1016 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 1017 return EADDRNOTAVAIL; 1018 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1019 M_WAITOK|M_ZERO); 1020 sdl->sdl_len = sizeof *sdl; 1021 sdl->sdl_family = AF_LINK; 1022 sdl->sdl_index = ifp->if_index; 1023 sdl->sdl_type = IFT_ETHER; 1024 sdl->sdl_alen = ETHER_ADDR_LEN; 1025 e_addr = LLADDR(sdl); 1026 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 1027 *llsa = (struct sockaddr *)sdl; 1028 return 0; 1029 #endif 1030 #ifdef INET6 1031 case AF_INET6: 1032 sin6 = (struct sockaddr_in6 *)sa; 1033 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1034 /* 1035 * An IP6 address of 0 means listen to all 1036 * of the Ethernet multicast address used for IP6. 1037 * (This is used for multicast routers.) 1038 */ 1039 ifp->if_flags |= IFF_ALLMULTI; 1040 *llsa = 0; 1041 return 0; 1042 } 1043 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1044 return EADDRNOTAVAIL; 1045 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1046 M_WAITOK|M_ZERO); 1047 sdl->sdl_len = sizeof *sdl; 1048 sdl->sdl_family = AF_LINK; 1049 sdl->sdl_index = ifp->if_index; 1050 sdl->sdl_type = IFT_ETHER; 1051 sdl->sdl_alen = ETHER_ADDR_LEN; 1052 e_addr = LLADDR(sdl); 1053 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1054 *llsa = (struct sockaddr *)sdl; 1055 return 0; 1056 #endif 1057 1058 default: 1059 /* 1060 * Well, the text isn't quite right, but it's the name 1061 * that counts... 1062 */ 1063 return EAFNOSUPPORT; 1064 } 1065 } 1066