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 1.7 2003/09/15 23:38:13 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, 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 netisr_dispatch(NETISR_NS, m); 276 return (error); 277 } 278 if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){ 279 m->m_flags |= M_BCAST; 280 } 281 break; 282 #endif /* NS */ 283 284 case pseudo_AF_HDRCMPLT: 285 hdrcmplt = 1; 286 eh = (struct ether_header *)dst->sa_data; 287 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); 288 /* FALLTHROUGH */ 289 290 case AF_UNSPEC: 291 loop_copy = -1; /* if this is for us, don't do it */ 292 eh = (struct ether_header *)dst->sa_data; 293 (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); 294 type = eh->ether_type; 295 break; 296 297 default: 298 printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, 299 dst->sa_family); 300 senderr(EAFNOSUPPORT); 301 } 302 303 /* 304 * Add local net header. If no space in first mbuf, 305 * allocate another. 306 */ 307 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 308 if (m == 0) 309 senderr(ENOBUFS); 310 eh = mtod(m, struct ether_header *); 311 (void)memcpy(&eh->ether_type, &type, 312 sizeof(eh->ether_type)); 313 (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); 314 if (hdrcmplt) 315 (void)memcpy(eh->ether_shost, esrc, 316 sizeof(eh->ether_shost)); 317 else 318 (void)memcpy(eh->ether_shost, ac->ac_enaddr, 319 sizeof(eh->ether_shost)); 320 321 /* 322 * If a simplex interface, and the packet is being sent to our 323 * Ethernet address or a broadcast address, loopback a copy. 324 * XXX To make a simplex device behave exactly like a duplex 325 * device, we should copy in the case of sending to our own 326 * ethernet address (thus letting the original actually appear 327 * on the wire). However, we don't do that here for security 328 * reasons and compatibility with the original behavior. 329 */ 330 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 331 int csum_flags = 0; 332 333 if (m->m_pkthdr.csum_flags & CSUM_IP) 334 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID); 335 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 336 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 337 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 338 struct mbuf *n; 339 340 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 341 n->m_pkthdr.csum_flags |= csum_flags; 342 if (csum_flags & CSUM_DATA_VALID) 343 n->m_pkthdr.csum_data = 0xffff; 344 (void)if_simloop(ifp, n, dst->sa_family, hlen); 345 } else 346 ifp->if_iqdrops++; 347 } else if (bcmp(eh->ether_dhost, 348 eh->ether_shost, ETHER_ADDR_LEN) == 0) { 349 m->m_pkthdr.csum_flags |= csum_flags; 350 if (csum_flags & CSUM_DATA_VALID) 351 m->m_pkthdr.csum_data = 0xffff; 352 (void) if_simloop(ifp, m, dst->sa_family, hlen); 353 return (0); /* XXX */ 354 } 355 } 356 357 /* Handle ng_ether(4) processing, if any */ 358 if (ng_ether_output_p != NULL) { 359 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) { 360 bad: if (m != NULL) 361 m_freem(m); 362 return (error); 363 } 364 if (m == NULL) 365 return (0); 366 } 367 368 /* Continue with link-layer output */ 369 return ether_output_frame(ifp, m); 370 } 371 372 /* 373 * Ethernet link layer output routine to send a raw frame to the device. 374 * 375 * This assumes that the 14 byte Ethernet header is present and contiguous 376 * in the first mbuf (if BRIDGE'ing). 377 */ 378 int 379 ether_output_frame(ifp, m) 380 struct ifnet *ifp; 381 struct mbuf *m; 382 { 383 int error = 0; 384 int s; 385 struct ip_fw *rule = NULL; 386 387 /* Extract info from dummynet tag, ignore others */ 388 for (; m->m_type == MT_TAG; m = m->m_next) 389 if (m->m_flags == PACKET_TAG_DUMMYNET) 390 rule = ((struct dn_pkt *)m)->rule; 391 392 if (rule) /* packet was already bridged */ 393 goto no_bridge; 394 395 if (BDG_ACTIVE(ifp) ) { 396 struct ether_header *eh; /* a ptr suffices */ 397 398 m->m_pkthdr.rcvif = NULL; 399 eh = mtod(m, struct ether_header *); 400 m_adj(m, ETHER_HDR_LEN); 401 m = bdg_forward_ptr(m, eh, ifp); 402 if (m != NULL) 403 m_freem(m); 404 return (0); 405 } 406 407 no_bridge: 408 s = splimp(); 409 if (IPFW_LOADED && ether_ipfw != 0) { 410 struct ether_header save_eh, *eh; 411 412 eh = mtod(m, struct ether_header *); 413 save_eh = *eh; 414 m_adj(m, ETHER_HDR_LEN); 415 if (ether_ipfw_chk(&m, ifp, &rule, eh, 0) == 0) { 416 if (m) { 417 m_freem(m); 418 return ENOBUFS; /* pkt dropped */ 419 } else 420 return 0; /* consumed e.g. in a pipe */ 421 } 422 /* packet was ok, restore the ethernet header */ 423 if ( (void *)(eh + 1) == (void *)m->m_data) { 424 m->m_data -= ETHER_HDR_LEN ; 425 m->m_len += ETHER_HDR_LEN ; 426 m->m_pkthdr.len += ETHER_HDR_LEN ; 427 } else { 428 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 429 if (m == NULL) /* nope... */ 430 return ENOBUFS; 431 bcopy(&save_eh, mtod(m, struct ether_header *), 432 ETHER_HDR_LEN); 433 } 434 } 435 436 /* 437 * Queue message on interface, update output statistics if 438 * successful, and start output if interface not yet active. 439 */ 440 if (!IF_HANDOFF(&ifp->if_snd, m, ifp)) 441 error = ENOBUFS; 442 splx(s); 443 return (error); 444 } 445 446 /* 447 * ipfw processing for ethernet packets (in and out). 448 * The second parameter is NULL from ether_demux, and ifp from 449 * ether_output_frame. This section of code could be used from 450 * bridge.c as well as long as we use some extra info 451 * to distinguish that case from ether_output_frame(); 452 */ 453 int 454 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 455 struct ip_fw **rule, struct ether_header *eh, int shared) 456 { 457 struct ether_header save_eh = *eh; /* might be a ptr in m */ 458 int i; 459 struct ip_fw_args args; 460 461 if (*rule != NULL && fw_one_pass) 462 return 1; /* dummynet packet, already partially processed */ 463 464 /* 465 * I need some amt of data to be contiguous, and in case others need 466 * the packet (shared==1) also better be in the first mbuf. 467 */ 468 i = min( (*m0)->m_pkthdr.len, max_protohdr); 469 if ( shared || (*m0)->m_len < i) { 470 *m0 = m_pullup(*m0, i); 471 if (*m0 == NULL) 472 return 0; 473 } 474 475 args.m = *m0; /* the packet we are looking at */ 476 args.oif = dst; /* destination, if any */ 477 args.divert_rule = 0; /* we do not support divert yet */ 478 args.rule = *rule; /* matching rule to restart */ 479 args.next_hop = NULL; /* we do not support forward yet */ 480 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 481 i = ip_fw_chk_ptr(&args); 482 *m0 = args.m; 483 *rule = args.rule; 484 485 if ( (i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */ 486 return 0; 487 488 if (i == 0) /* a PASS rule. */ 489 return 1; 490 491 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) { 492 /* 493 * Pass the pkt to dummynet, which consumes it. 494 * If shared, make a copy and keep the original. 495 */ 496 struct mbuf *m ; 497 498 if (shared) { 499 m = m_copypacket(*m0, M_DONTWAIT); 500 if (m == NULL) 501 return 0; 502 } else { 503 m = *m0 ; /* pass the original to dummynet */ 504 *m0 = NULL ; /* and nothing back to the caller */ 505 } 506 /* 507 * Prepend the header, optimize for the common case of 508 * eh pointing into the mbuf. 509 */ 510 if ( (void *)(eh + 1) == (void *)m->m_data) { 511 m->m_data -= ETHER_HDR_LEN ; 512 m->m_len += ETHER_HDR_LEN ; 513 m->m_pkthdr.len += ETHER_HDR_LEN ; 514 } else { 515 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 516 if (m == NULL) /* nope... */ 517 return 0; 518 bcopy(&save_eh, mtod(m, struct ether_header *), 519 ETHER_HDR_LEN); 520 } 521 ip_dn_io_ptr(m, (i & 0xffff), 522 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 523 return 0; 524 } 525 /* 526 * XXX at some point add support for divert/forward actions. 527 * If none of the above matches, we have to drop the pkt. 528 */ 529 return 0; 530 } 531 532 /* 533 * Process a received Ethernet packet. We have two different interfaces: 534 * one (conventional) assumes the packet in the mbuf, with the ethernet 535 * header provided separately in *eh. The second one (new) has everything 536 * in the mbuf, and we can tell it because eh == NULL. 537 * The caller MUST MAKE SURE that there are at least 538 * sizeof(struct ether_header) bytes in the first mbuf. 539 * 540 * This allows us to concentrate in one place a bunch of code which 541 * is replicated in all device drivers. Also, many functions called 542 * from ether_input() try to put the eh back into the mbuf, so we 543 * can later propagate the 'contiguous packet' interface to them, 544 * and handle the old interface just here. 545 * 546 * NOTA BENE: for many drivers "eh" is a pointer into the first mbuf or 547 * cluster, right before m_data. So be very careful when working on m, 548 * as you could destroy *eh !! 549 * 550 * First we perform any link layer operations, then continue 551 * to the upper layers with ether_demux(). 552 */ 553 void 554 ether_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 555 { 556 struct ether_header save_eh; 557 558 if (eh == NULL) { 559 if (m->m_len < sizeof(struct ether_header)) { 560 /* XXX error in the caller. */ 561 m_freem(m); 562 return; 563 } 564 m->m_pkthdr.rcvif = ifp; 565 eh = mtod(m, struct ether_header *); 566 m->m_data += sizeof(struct ether_header); 567 m->m_len -= sizeof(struct ether_header); 568 m->m_pkthdr.len = m->m_len; 569 } 570 571 /* Check for a BPF tap */ 572 if (ifp->if_bpf != NULL) { 573 struct m_hdr mh; 574 575 /* This kludge is OK; BPF treats the "mbuf" as read-only */ 576 mh.mh_next = m; 577 mh.mh_data = (char *)eh; 578 mh.mh_len = ETHER_HDR_LEN; 579 bpf_mtap(ifp, (struct mbuf *)&mh); 580 } 581 582 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 583 584 /* Handle ng_ether(4) processing, if any */ 585 if (ng_ether_input_p != NULL) { 586 (*ng_ether_input_p)(ifp, &m, eh); 587 if (m == NULL) 588 return; 589 } 590 591 /* Check for bridging mode */ 592 if (BDG_ACTIVE(ifp) ) { 593 struct ifnet *bif; 594 595 /* Check with bridging code */ 596 if ((bif = bridge_in_ptr(ifp, eh)) == BDG_DROP) { 597 m_freem(m); 598 return; 599 } 600 if (bif != BDG_LOCAL) { 601 save_eh = *eh ; /* because it might change */ 602 m = bdg_forward_ptr(m, eh, bif); /* needs forwarding */ 603 /* 604 * Do not continue if bdg_forward_ptr() processed our 605 * packet (and cleared the mbuf pointer m) or if 606 * it dropped (m_free'd) the packet itself. 607 */ 608 if (m == NULL) { 609 if (bif == BDG_BCAST || bif == BDG_MCAST) 610 printf("bdg_forward drop MULTICAST PKT\n"); 611 return; 612 } 613 eh = &save_eh ; 614 } 615 if (bif == BDG_LOCAL 616 || bif == BDG_BCAST 617 || bif == BDG_MCAST) 618 goto recvLocal; /* receive locally */ 619 620 /* If not local and not multicast, just drop it */ 621 if (m != NULL) 622 m_freem(m); 623 return; 624 } 625 626 recvLocal: 627 /* Continue with upper layer processing */ 628 ether_demux(ifp, eh, m); 629 } 630 631 /* 632 * Upper layer processing for a received Ethernet packet. 633 */ 634 void 635 ether_demux(ifp, eh, m) 636 struct ifnet *ifp; 637 struct ether_header *eh; 638 struct mbuf *m; 639 { 640 int isr; 641 u_short ether_type; 642 #if defined(NETATALK) 643 struct llc *l; 644 #endif 645 struct ip_fw *rule = NULL; 646 647 /* Extract info from dummynet tag, ignore others */ 648 for (;m->m_type == MT_TAG; m = m->m_next) 649 if (m->m_flags == PACKET_TAG_DUMMYNET) { 650 rule = ((struct dn_pkt *)m)->rule; 651 ifp = m->m_next->m_pkthdr.rcvif; 652 } 653 654 if (rule) /* packet was already bridged */ 655 goto post_stats; 656 657 if (! (BDG_ACTIVE(ifp) ) ) 658 /* Discard packet if upper layers shouldn't see it because it was 659 unicast to a different Ethernet address. If the driver is working 660 properly, then this situation can only happen when the interface 661 is in promiscuous mode. */ 662 if ((ifp->if_flags & IFF_PROMISC) != 0 663 && (eh->ether_dhost[0] & 1) == 0 664 && bcmp(eh->ether_dhost, 665 IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0 666 && (ifp->if_ipending & IFF_PPROMISC) == 0) { 667 m_freem(m); 668 return; 669 } 670 671 /* Discard packet if interface is not up */ 672 if ((ifp->if_flags & IFF_UP) == 0) { 673 m_freem(m); 674 return; 675 } 676 if (eh->ether_dhost[0] & 1) { 677 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 678 sizeof(etherbroadcastaddr)) == 0) 679 m->m_flags |= M_BCAST; 680 else 681 m->m_flags |= M_MCAST; 682 } 683 if (m->m_flags & (M_BCAST|M_MCAST)) 684 ifp->if_imcasts++; 685 686 post_stats: 687 if (IPFW_LOADED && ether_ipfw != 0) { 688 if (ether_ipfw_chk(&m, NULL, &rule, eh, 0 ) == 0) { 689 if (m) 690 m_freem(m); 691 return; 692 } 693 } 694 695 ether_type = ntohs(eh->ether_type); 696 697 switch (ether_type) { 698 #ifdef INET 699 case ETHERTYPE_IP: 700 if (ipflow_fastforward(m)) 701 return; 702 isr = NETISR_IP; 703 break; 704 705 case ETHERTYPE_ARP: 706 if (ifp->if_flags & IFF_NOARP) { 707 /* Discard packet if ARP is disabled on interface */ 708 m_freem(m); 709 return; 710 } 711 isr = NETISR_ARP; 712 break; 713 #endif 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 #ifdef INET6 722 case ETHERTYPE_IPV6: 723 isr = NETISR_IPV6; 724 break; 725 #endif 726 #ifdef NS 727 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 728 isr = NETISR_NS; 729 break; 730 731 #endif /* NS */ 732 #ifdef NETATALK 733 case ETHERTYPE_AT: 734 isr = NETISR_ATALK1; 735 break; 736 case ETHERTYPE_AARP: 737 isr = NETISR_AARP; 738 break; 739 #endif /* NETATALK */ 740 case ETHERTYPE_VLAN: 741 /* XXX lock ? */ 742 if (vlan_input_p != NULL) 743 (*vlan_input_p)(eh, m); 744 else { 745 m->m_pkthdr.rcvif->if_noproto++; 746 m_freem(m); 747 } 748 /* XXX unlock ? */ 749 return; 750 default: 751 #ifdef IPX 752 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 753 return; 754 #endif /* IPX */ 755 #ifdef NS 756 checksum = mtod(m, ushort *); 757 /* Novell 802.3 */ 758 if ((ether_type <= ETHERMTU) && 759 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) { 760 if (*checksum == 0xE0E0) { 761 m->m_pkthdr.len -= 3; 762 m->m_len -= 3; 763 m->m_data += 3; 764 } 765 isr = NETISR_NS; 766 break; 767 } 768 #endif /* NS */ 769 #ifdef NETATALK 770 if (ether_type > ETHERMTU) 771 goto dropanyway; 772 l = mtod(m, struct llc *); 773 if (l->llc_dsap == LLC_SNAP_LSAP && 774 l->llc_ssap == LLC_SNAP_LSAP && 775 l->llc_control == LLC_UI) { 776 if (Bcmp(&(l->llc_snap_org_code)[0], at_org_code, 777 sizeof(at_org_code)) == 0 && 778 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 779 m_adj(m, sizeof(struct llc)); 780 isr = NETISR_ATALK2; 781 break; 782 } 783 if (Bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 784 sizeof(aarp_org_code)) == 0 && 785 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 786 m_adj(m, sizeof(struct llc)); 787 isr = NETISR_AARP; 788 break; 789 } 790 } 791 dropanyway: 792 #endif /* NETATALK */ 793 if (ng_ether_input_orphan_p != NULL) 794 (*ng_ether_input_orphan_p)(ifp, m, eh); 795 else 796 m_freem(m); 797 return; 798 } 799 netisr_dispatch(isr, m); 800 } 801 802 /* 803 * Perform common duties while attaching to interface list 804 */ 805 void 806 ether_ifattach(ifp, bpf) 807 struct ifnet *ifp; 808 int bpf; 809 { 810 struct ifaddr *ifa; 811 struct sockaddr_dl *sdl; 812 813 ifp->if_type = IFT_ETHER; 814 ifp->if_addrlen = 6; 815 ifp->if_hdrlen = 14; 816 if_attach(ifp); 817 ifp->if_mtu = ETHERMTU; 818 ifp->if_resolvemulti = ether_resolvemulti; 819 if (ifp->if_baudrate == 0) 820 ifp->if_baudrate = 10000000; 821 ifa = ifnet_addrs[ifp->if_index - 1]; 822 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __FUNCTION__)); 823 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 824 sdl->sdl_type = IFT_ETHER; 825 sdl->sdl_alen = ifp->if_addrlen; 826 bcopy((IFP2AC(ifp))->ac_enaddr, LLADDR(sdl), ifp->if_addrlen); 827 if (bpf) 828 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 829 if (ng_ether_attach_p != NULL) 830 (*ng_ether_attach_p)(ifp); 831 if (BDG_LOADED) 832 bdgtakeifaces_ptr(); 833 } 834 835 /* 836 * Perform common duties while detaching an Ethernet interface 837 */ 838 void 839 ether_ifdetach(ifp, bpf) 840 struct ifnet *ifp; 841 int bpf; 842 { 843 if (ng_ether_detach_p != NULL) 844 (*ng_ether_detach_p)(ifp); 845 if (bpf) 846 bpfdetach(ifp); 847 if_detach(ifp); 848 if (BDG_LOADED) 849 bdgtakeifaces_ptr(); 850 } 851 852 SYSCTL_DECL(_net_link); 853 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 854 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 855 ðer_ipfw,0,"Pass ether pkts through firewall"); 856 857 int 858 ether_ioctl(ifp, command, data) 859 struct ifnet *ifp; 860 int command; 861 caddr_t data; 862 { 863 struct ifaddr *ifa = (struct ifaddr *) data; 864 struct ifreq *ifr = (struct ifreq *) data; 865 int error = 0; 866 867 switch (command) { 868 case SIOCSIFADDR: 869 ifp->if_flags |= IFF_UP; 870 871 switch (ifa->ifa_addr->sa_family) { 872 #ifdef INET 873 case AF_INET: 874 ifp->if_init(ifp->if_softc); /* before arpwhohas */ 875 arp_ifinit(ifp, ifa); 876 break; 877 #endif 878 #ifdef IPX 879 /* 880 * XXX - This code is probably wrong 881 */ 882 case AF_IPX: 883 { 884 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); 885 struct arpcom *ac = IFP2AC(ifp); 886 887 if (ipx_nullhost(*ina)) 888 ina->x_host = 889 *(union ipx_host *) 890 ac->ac_enaddr; 891 else { 892 bcopy((caddr_t) ina->x_host.c_host, 893 (caddr_t) ac->ac_enaddr, 894 sizeof(ac->ac_enaddr)); 895 } 896 897 /* 898 * Set new address 899 */ 900 ifp->if_init(ifp->if_softc); 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 = 915 *(union ns_host *) (ac->ac_enaddr); 916 else { 917 bcopy((caddr_t) ina->x_host.c_host, 918 (caddr_t) ac->ac_enaddr, 919 sizeof(ac->ac_enaddr)); 920 } 921 922 /* 923 * Set new address 924 */ 925 ifp->if_init(ifp->if_softc); 926 break; 927 } 928 #endif 929 default: 930 ifp->if_init(ifp->if_softc); 931 break; 932 } 933 break; 934 935 case SIOCGIFADDR: 936 { 937 struct sockaddr *sa; 938 939 sa = (struct sockaddr *) & ifr->ifr_data; 940 bcopy(IFP2AC(ifp)->ac_enaddr, 941 (caddr_t) sa->sa_data, ETHER_ADDR_LEN); 942 } 943 break; 944 945 case SIOCSIFMTU: 946 /* 947 * Set the interface MTU. 948 */ 949 if (ifr->ifr_mtu > ETHERMTU) { 950 error = EINVAL; 951 } else { 952 ifp->if_mtu = ifr->ifr_mtu; 953 } 954 break; 955 } 956 return (error); 957 } 958 959 int 960 ether_resolvemulti(ifp, llsa, sa) 961 struct ifnet *ifp; 962 struct sockaddr **llsa; 963 struct sockaddr *sa; 964 { 965 struct sockaddr_dl *sdl; 966 struct sockaddr_in *sin; 967 #ifdef INET6 968 struct sockaddr_in6 *sin6; 969 #endif 970 u_char *e_addr; 971 972 switch(sa->sa_family) { 973 case AF_LINK: 974 /* 975 * No mapping needed. Just check that it's a valid MC address. 976 */ 977 sdl = (struct sockaddr_dl *)sa; 978 e_addr = LLADDR(sdl); 979 if ((e_addr[0] & 1) != 1) 980 return EADDRNOTAVAIL; 981 *llsa = 0; 982 return 0; 983 984 #ifdef INET 985 case AF_INET: 986 sin = (struct sockaddr_in *)sa; 987 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 988 return EADDRNOTAVAIL; 989 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 990 M_WAITOK|M_ZERO); 991 sdl->sdl_len = sizeof *sdl; 992 sdl->sdl_family = AF_LINK; 993 sdl->sdl_index = ifp->if_index; 994 sdl->sdl_type = IFT_ETHER; 995 sdl->sdl_alen = ETHER_ADDR_LEN; 996 e_addr = LLADDR(sdl); 997 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 998 *llsa = (struct sockaddr *)sdl; 999 return 0; 1000 #endif 1001 #ifdef INET6 1002 case AF_INET6: 1003 sin6 = (struct sockaddr_in6 *)sa; 1004 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1005 /* 1006 * An IP6 address of 0 means listen to all 1007 * of the Ethernet multicast address used for IP6. 1008 * (This is used for multicast routers.) 1009 */ 1010 ifp->if_flags |= IFF_ALLMULTI; 1011 *llsa = 0; 1012 return 0; 1013 } 1014 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1015 return EADDRNOTAVAIL; 1016 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1017 M_WAITOK|M_ZERO); 1018 sdl->sdl_len = sizeof *sdl; 1019 sdl->sdl_family = AF_LINK; 1020 sdl->sdl_index = ifp->if_index; 1021 sdl->sdl_type = IFT_ETHER; 1022 sdl->sdl_alen = ETHER_ADDR_LEN; 1023 e_addr = LLADDR(sdl); 1024 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1025 *llsa = (struct sockaddr *)sdl; 1026 return 0; 1027 #endif 1028 1029 default: 1030 /* 1031 * Well, the text isn't quite right, but it's the name 1032 * that counts... 1033 */ 1034 return EAFNOSUPPORT; 1035 } 1036 } 1037