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sys/net/if_ethersubr.c
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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 * $FreeBSD$ 35 */ 36 37 #include "opt_atalk.h" 38 #include "opt_inet.h" 39 #include "opt_inet6.h" 40 #include "opt_ipx.h" 41 #include "opt_bdg.h" 42 #include "opt_netgraph.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/malloc.h> 48 #include <sys/mbuf.h> 49 #include <sys/socket.h> 50 #include <sys/sockio.h> 51 #include <sys/sysctl.h> 52 53 #include <net/if.h> 54 #include <net/netisr.h> 55 #include <net/route.h> 56 #include <net/if_llc.h> 57 #include <net/if_dl.h> 58 #include <net/if_types.h> 59 #include <net/bpf.h> 60 #include <net/ethernet.h> 61 #include <net/bridge.h> 62 63 #if defined(INET) || defined(INET6) 64 #include <netinet/in.h> 65 #include <netinet/in_var.h> 66 #include <netinet/if_ether.h> 67 #include <netinet/ip_fw.h> 68 #include <netinet/ip_dummynet.h> 69 #endif 70 #ifdef INET6 71 #include <netinet6/nd6.h> 72 #endif 73 74 #ifdef IPX 75 #include <netipx/ipx.h> 76 #include <netipx/ipx_if.h> 77 int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m); 78 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, 79 struct sockaddr *dst, short *tp, int *hlen); 80 #endif 81 82 #ifdef NS 83 #include <netns/ns.h> 84 #include <netns/ns_if.h> 85 ushort ns_nettype; 86 int ether_outputdebug = 0; 87 int ether_inputdebug = 0; 88 #endif 89 90 #ifdef NETATALK 91 #include <netatalk/at.h> 92 #include <netatalk/at_var.h> 93 #include <netatalk/at_extern.h> 94 95 #define llc_snap_org_code llc_un.type_snap.org_code 96 #define llc_snap_ether_type llc_un.type_snap.ether_type 97 98 extern u_char at_org_code[3]; 99 extern u_char aarp_org_code[3]; 100 #endif /* NETATALK */ 101 102 /* netgraph node hooks for ng_ether(4) */ 103 void (*ng_ether_input_p)(struct ifnet *ifp, 104 struct mbuf **mp, struct ether_header *eh); 105 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, 106 struct mbuf *m, struct ether_header *eh); 107 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 108 void (*ng_ether_attach_p)(struct ifnet *ifp); 109 void (*ng_ether_detach_p)(struct ifnet *ifp); 110 111 int (*vlan_input_p)(struct ether_header *eh, struct mbuf *m); 112 int (*vlan_input_tag_p)(struct ether_header *eh, struct mbuf *m, 113 u_int16_t t); 114 115 /* bridge support */ 116 int do_bridge; 117 bridge_in_t *bridge_in_ptr; 118 bdg_forward_t *bdg_forward_ptr; 119 bdgtakeifaces_t *bdgtakeifaces_ptr; 120 struct bdg_softc *ifp2sc; 121 122 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 123 struct sockaddr *); 124 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 125 #define senderr(e) do { error = (e); goto bad;} while (0) 126 #define IFP2AC(IFP) ((struct arpcom *)IFP) 127 128 int 129 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 130 struct ip_fw **rule, struct ether_header *eh, int shared); 131 static int ether_ipfw; 132 133 /* 134 * Ethernet output routine. 135 * Encapsulate a packet of type family for the local net. 136 * Use trailer local net encapsulation if enough data in first 137 * packet leaves a multiple of 512 bytes of data in remainder. 138 * Assumes that ifp is actually pointer to arpcom structure. 139 */ 140 int 141 ether_output(ifp, m, dst, rt0) 142 register struct ifnet *ifp; 143 struct mbuf *m; 144 struct sockaddr *dst; 145 struct rtentry *rt0; 146 { 147 short type; 148 int error = 0, hdrcmplt = 0; 149 u_char esrc[6], edst[6]; 150 register struct rtentry *rt; 151 register struct ether_header *eh; 152 int loop_copy = 0; 153 int hlen; /* link layer header lenght */ 154 struct arpcom *ac = IFP2AC(ifp); 155 156 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 157 senderr(ENETDOWN); 158 rt = rt0; 159 if (rt) { 160 if ((rt->rt_flags & RTF_UP) == 0) { 161 rt0 = rt = rtalloc1(dst, 1, 0UL); 162 if (rt0) 163 rt->rt_refcnt--; 164 else 165 senderr(EHOSTUNREACH); 166 } 167 if (rt->rt_flags & RTF_GATEWAY) { 168 if (rt->rt_gwroute == 0) 169 goto lookup; 170 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 171 rtfree(rt); rt = rt0; 172 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 173 0UL); 174 if ((rt = rt->rt_gwroute) == 0) 175 senderr(EHOSTUNREACH); 176 } 177 } 178 if (rt->rt_flags & RTF_REJECT) 179 if (rt->rt_rmx.rmx_expire == 0 || 180 time_second < rt->rt_rmx.rmx_expire) 181 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 182 } 183 hlen = ETHER_HDR_LEN; 184 switch (dst->sa_family) { 185 #ifdef INET 186 case AF_INET: 187 if (!arpresolve(ifp, rt, m, dst, edst, rt0)) 188 return (0); /* if not yet resolved */ 189 type = htons(ETHERTYPE_IP); 190 break; 191 #endif 192 #ifdef INET6 193 case AF_INET6: 194 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) { 195 /* Something bad happened */ 196 return(0); 197 } 198 type = htons(ETHERTYPE_IPV6); 199 break; 200 #endif 201 #ifdef IPX 202 case AF_IPX: 203 if (ef_outputp) { 204 error = ef_outputp(ifp, &m, dst, &type, &hlen); 205 if (error) 206 goto bad; 207 } else 208 type = htons(ETHERTYPE_IPX); 209 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 210 (caddr_t)edst, sizeof (edst)); 211 break; 212 #endif 213 #ifdef NETATALK 214 case AF_APPLETALK: 215 { 216 struct at_ifaddr *aa; 217 218 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { 219 goto bad; 220 } 221 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) 222 return (0); 223 /* 224 * In the phase 2 case, need to prepend an mbuf for the llc header. 225 * Since we must preserve the value of m, which is passed to us by 226 * value, we m_copy() the first mbuf, and use it for our llc header. 227 */ 228 if ( aa->aa_flags & AFA_PHASE2 ) { 229 struct llc llc; 230 231 M_PREPEND(m, sizeof(struct llc), M_WAIT); 232 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 233 llc.llc_control = LLC_UI; 234 bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); 235 llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); 236 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 237 type = htons(m->m_pkthdr.len); 238 hlen = sizeof(struct llc) + ETHER_HDR_LEN; 239 } else { 240 type = htons(ETHERTYPE_AT); 241 } 242 break; 243 } 244 #endif /* NETATALK */ 245 #ifdef NS 246 case AF_NS: 247 switch(ns_nettype){ 248 default: 249 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 250 type = 0x8137; 251 break; 252 case 0x0: /* Novell 802.3 */ 253 type = htons( m->m_pkthdr.len); 254 break; 255 case 0xe0e0: /* Novell 802.2 and Token-Ring */ 256 M_PREPEND(m, 3, M_WAIT); 257 type = htons( m->m_pkthdr.len); 258 cp = mtod(m, u_char *); 259 *cp++ = 0xE0; 260 *cp++ = 0xE0; 261 *cp++ = 0x03; 262 break; 263 } 264 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 265 (caddr_t)edst, sizeof (edst)); 266 /* 267 * XXX if ns_thishost is the same as the node's ethernet 268 * address then just the default code will catch this anyhow. 269 * So I'm not sure if this next clause should be here at all? 270 * [JRE] 271 */ 272 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))){ 273 m->m_pkthdr.rcvif = ifp; 274 inq = &nsintrq; 275 if (IF_HANDOFF(inq, m, NULL)) 276 schednetisr(NETISR_NS); 277 return (error); 278 } 279 if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){ 280 m->m_flags |= M_BCAST; 281 } 282 break; 283 #endif /* NS */ 284 285 case pseudo_AF_HDRCMPLT: 286 hdrcmplt = 1; 287 eh = (struct ether_header *)dst->sa_data; 288 (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); 289 /* FALLTHROUGH */ 290 291 case AF_UNSPEC: 292 loop_copy = -1; /* if this is for us, don't do it */ 293 eh = (struct ether_header *)dst->sa_data; 294 (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); 295 type = eh->ether_type; 296 break; 297 298 default: 299 printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, 300 dst->sa_family); 301 senderr(EAFNOSUPPORT); 302 } 303 304 /* 305 * Add local net header. If no space in first mbuf, 306 * allocate another. 307 */ 308 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 309 if (m == 0) 310 senderr(ENOBUFS); 311 eh = mtod(m, struct ether_header *); 312 (void)memcpy(&eh->ether_type, &type, 313 sizeof(eh->ether_type)); 314 (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); 315 if (hdrcmplt) 316 (void)memcpy(eh->ether_shost, esrc, 317 sizeof(eh->ether_shost)); 318 else 319 (void)memcpy(eh->ether_shost, ac->ac_enaddr, 320 sizeof(eh->ether_shost)); 321 322 /* 323 * If a simplex interface, and the packet is being sent to our 324 * Ethernet address or a broadcast address, loopback a copy. 325 * XXX To make a simplex device behave exactly like a duplex 326 * device, we should copy in the case of sending to our own 327 * ethernet address (thus letting the original actually appear 328 * on the wire). However, we don't do that here for security 329 * reasons and compatibility with the original behavior. 330 */ 331 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 332 int csum_flags = 0; 333 334 if (m->m_pkthdr.csum_flags & CSUM_IP) 335 csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID); 336 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 337 csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR); 338 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 339 struct mbuf *n; 340 341 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 342 n->m_pkthdr.csum_flags |= csum_flags; 343 if (csum_flags & CSUM_DATA_VALID) 344 n->m_pkthdr.csum_data = 0xffff; 345 (void)if_simloop(ifp, n, dst->sa_family, hlen); 346 } else 347 ifp->if_iqdrops++; 348 } else if (bcmp(eh->ether_dhost, 349 eh->ether_shost, ETHER_ADDR_LEN) == 0) { 350 m->m_pkthdr.csum_flags |= csum_flags; 351 if (csum_flags & CSUM_DATA_VALID) 352 m->m_pkthdr.csum_data = 0xffff; 353 (void) if_simloop(ifp, m, dst->sa_family, hlen); 354 return (0); /* XXX */ 355 } 356 } 357 358 /* Handle ng_ether(4) processing, if any */ 359 if (ng_ether_output_p != NULL) { 360 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) { 361 bad: if (m != NULL) 362 m_freem(m); 363 return (error); 364 } 365 if (m == NULL) 366 return (0); 367 } 368 369 /* Continue with link-layer output */ 370 return ether_output_frame(ifp, m); 371 } 372 373 /* 374 * Ethernet link layer output routine to send a raw frame to the device. 375 * 376 * This assumes that the 14 byte Ethernet header is present and contiguous 377 * in the first mbuf (if BRIDGE'ing). 378 */ 379 int 380 ether_output_frame(ifp, m) 381 struct ifnet *ifp; 382 struct mbuf *m; 383 { 384 int error = 0; 385 int s; 386 struct ip_fw *rule = NULL; 387 388 /* Extract info from dummynet tag, ignore others */ 389 for (; m->m_type == MT_TAG; m = m->m_next) 390 if (m->m_flags == PACKET_TAG_DUMMYNET) 391 rule = ((struct dn_pkt *)m)->rule; 392 393 if (rule) /* packet was already bridged */ 394 goto no_bridge; 395 396 if (BDG_ACTIVE(ifp) ) { 397 struct ether_header *eh; /* a ptr suffices */ 398 399 m->m_pkthdr.rcvif = NULL; 400 eh = mtod(m, struct ether_header *); 401 m_adj(m, ETHER_HDR_LEN); 402 m = bdg_forward_ptr(m, eh, ifp); 403 if (m != NULL) 404 m_freem(m); 405 return (0); 406 } 407 408 no_bridge: 409 s = splimp(); 410 if (IPFW_LOADED && ether_ipfw != 0) { 411 struct ether_header save_eh, *eh; 412 413 eh = mtod(m, struct ether_header *); 414 save_eh = *eh; 415 m_adj(m, ETHER_HDR_LEN); 416 if (ether_ipfw_chk(&m, ifp, &rule, eh, 0) == 0) { 417 splx(s); 418 if (m) { 419 m_freem(m); 420 return EACCES; /* 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 splx(s); 433 return ENOBUFS; 434 } 435 bcopy(&save_eh, mtod(m, struct ether_header *), 436 ETHER_HDR_LEN); 437 } 438 } 439 440 /* 441 * Queue message on interface, update output statistics if 442 * successful, and start output if interface not yet active. 443 */ 444 if (!IF_HANDOFF(&ifp->if_snd, m, ifp)) 445 error = ENOBUFS; 446 splx(s); 447 return (error); 448 } 449 450 /* 451 * ipfw processing for ethernet packets (in and out). 452 * The second parameter is NULL from ether_demux, and ifp from 453 * ether_output_frame. This section of code could be used from 454 * bridge.c as well as long as we use some extra info 455 * to distinguish that case from ether_output_frame(); 456 */ 457 int 458 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 459 struct ip_fw **rule, struct ether_header *eh, int shared) 460 { 461 struct ether_header save_eh = *eh; /* might be a ptr in m */ 462 int i; 463 struct ip_fw_args args; 464 465 if (*rule != NULL && fw_one_pass) 466 return 1; /* dummynet packet, already partially processed */ 467 468 /* 469 * I need some amt of data to be contiguous, and in case others need 470 * the packet (shared==1) also better be in the first mbuf. 471 */ 472 i = min( (*m0)->m_pkthdr.len, max_protohdr); 473 if ( shared || (*m0)->m_len < i) { 474 *m0 = m_pullup(*m0, i); 475 if (*m0 == NULL) 476 return 0; 477 } 478 479 args.m = *m0; /* the packet we are looking at */ 480 args.oif = dst; /* destination, if any */ 481 args.divert_rule = 0; /* we do not support divert yet */ 482 args.rule = *rule; /* matching rule to restart */ 483 args.next_hop = NULL; /* we do not support forward yet */ 484 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 485 i = ip_fw_chk_ptr(&args); 486 *m0 = args.m; 487 *rule = args.rule; 488 489 if ( (i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */ 490 return 0; 491 492 if (i == 0) /* a PASS rule. */ 493 return 1; 494 495 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) { 496 /* 497 * Pass the pkt to dummynet, which consumes it. 498 * If shared, make a copy and keep the original. 499 */ 500 struct mbuf *m ; 501 502 if (shared) { 503 m = m_copypacket(*m0, M_DONTWAIT); 504 if (m == NULL) 505 return 0; 506 } else { 507 m = *m0 ; /* pass the original to dummynet */ 508 *m0 = NULL ; /* and nothing back to the caller */ 509 } 510 /* 511 * Prepend the header, optimize for the common case of 512 * eh pointing into the mbuf. 513 */ 514 if ( (void *)(eh + 1) == (void *)m->m_data) { 515 m->m_data -= ETHER_HDR_LEN ; 516 m->m_len += ETHER_HDR_LEN ; 517 m->m_pkthdr.len += ETHER_HDR_LEN ; 518 } else { 519 M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT); 520 if (m == NULL) /* nope... */ 521 return 0; 522 bcopy(&save_eh, mtod(m, struct ether_header *), 523 ETHER_HDR_LEN); 524 } 525 ip_dn_io_ptr(m, (i & 0xffff), 526 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 527 return 0; 528 } 529 /* 530 * XXX at some point add support for divert/forward actions. 531 * If none of the above matches, we have to drop the pkt. 532 */ 533 return 0; 534 } 535 536 /* 537 * Process a received Ethernet packet. We have two different interfaces: 538 * one (conventional) assumes the packet in the mbuf, with the ethernet 539 * header provided separately in *eh. The second one (new) has everything 540 * in the mbuf, and we can tell it because eh == NULL. 541 * The caller MUST MAKE SURE that there are at least 542 * sizeof(struct ether_header) bytes in the first mbuf. 543 * 544 * This allows us to concentrate in one place a bunch of code which 545 * is replicated in all device drivers. Also, many functions called 546 * from ether_input() try to put the eh back into the mbuf, so we 547 * can later propagate the 'contiguous packet' interface to them, 548 * and handle the old interface just here. 549 * 550 * NOTA BENE: for many drivers "eh" is a pointer into the first mbuf or 551 * cluster, right before m_data. So be very careful when working on m, 552 * as you could destroy *eh !! 553 * 554 * First we perform any link layer operations, then continue 555 * to the upper layers with ether_demux(). 556 */ 557 void 558 ether_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 559 { 560 struct ether_header save_eh; 561 562 if (eh == NULL) { 563 if (m->m_len < sizeof(struct ether_header)) { 564 /* XXX error in the caller. */ 565 m_freem(m); 566 return; 567 } 568 m->m_pkthdr.rcvif = ifp; 569 eh = mtod(m, struct ether_header *); 570 m_adj(m, sizeof(*eh)); 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 register 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 register struct ifnet *ifp; 837 int bpf; 838 { 839 register struct ifaddr *ifa; 840 register 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 register 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 register 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 }
Cache object: 998689043d13d2f05483240bf4ce8462
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