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 1.49 2007/10/13 11:32:34 sephe 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_netgraph.h" 43 #include "opt_carp.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/ifq_var.h> 61 #include <net/bpf.h> 62 #include <net/ethernet.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 CARP 76 #include <netinet/ip_carp.h> 77 #endif 78 79 #ifdef IPX 80 #include <netproto/ipx/ipx.h> 81 #include <netproto/ipx/ipx_if.h> 82 int (*ef_inputp)(struct ifnet*, const struct ether_header *eh, struct mbuf *m); 83 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, 84 short *tp, int *hlen); 85 #endif 86 87 #ifdef NS 88 #include <netns/ns.h> 89 #include <netns/ns_if.h> 90 ushort ns_nettype; 91 int ether_outputdebug = 0; 92 int ether_inputdebug = 0; 93 #endif 94 95 #ifdef NETATALK 96 #include <netproto/atalk/at.h> 97 #include <netproto/atalk/at_var.h> 98 #include <netproto/atalk/at_extern.h> 99 100 #define llc_snap_org_code llc_un.type_snap.org_code 101 #define llc_snap_ether_type llc_un.type_snap.ether_type 102 103 extern u_char at_org_code[3]; 104 extern u_char aarp_org_code[3]; 105 #endif /* NETATALK */ 106 107 /* netgraph node hooks for ng_ether(4) */ 108 void (*ng_ether_input_p)(struct ifnet *ifp, 109 struct mbuf **mp, const struct ether_header *eh); 110 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, 111 struct mbuf *m, const struct ether_header *eh); 112 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 113 void (*ng_ether_attach_p)(struct ifnet *ifp); 114 void (*ng_ether_detach_p)(struct ifnet *ifp); 115 116 int (*vlan_input_p)(const struct ether_header *eh, struct mbuf *m); 117 int (*vlan_input_tag_p)(struct mbuf *m, uint16_t t); 118 119 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *, 120 struct rtentry *); 121 122 /* 123 * if_bridge support 124 */ 125 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *); 126 int (*bridge_output_p)(struct ifnet *, struct mbuf *, 127 struct sockaddr *, struct rtentry *); 128 void (*bridge_dn_p)(struct mbuf *, struct ifnet *); 129 130 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 131 struct sockaddr *); 132 133 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = { 134 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 135 }; 136 137 #define gotoerr(e) do { error = (e); goto bad; } while (0) 138 #define IFP2AC(ifp) ((struct arpcom *)(ifp)) 139 140 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 141 struct ip_fw **rule, 142 const struct ether_header *eh, 143 boolean_t shared); 144 145 static int ether_ipfw; 146 SYSCTL_DECL(_net_link); 147 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 148 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 149 ðer_ipfw, 0, "Pass ether pkts through firewall"); 150 151 /* 152 * Ethernet output routine. 153 * Encapsulate a packet of type family for the local net. 154 * Use trailer local net encapsulation if enough data in first 155 * packet leaves a multiple of 512 bytes of data in remainder. 156 * Assumes that ifp is actually pointer to arpcom structure. 157 */ 158 static int 159 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 160 struct rtentry *rt) 161 { 162 struct ether_header *eh, *deh; 163 u_char *edst; 164 int loop_copy = 0; 165 int hlen = ETHER_HDR_LEN; /* link layer header length */ 166 struct arpcom *ac = IFP2AC(ifp); 167 int error; 168 169 ASSERT_SERIALIZED(ifp->if_serializer); 170 171 if (ifp->if_flags & IFF_MONITOR) 172 gotoerr(ENETDOWN); 173 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 174 gotoerr(ENETDOWN); 175 176 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT); 177 if (m == NULL) 178 return (ENOBUFS); 179 eh = mtod(m, struct ether_header *); 180 edst = eh->ether_dhost; 181 182 /* 183 * Fill in the destination ethernet address and frame type. 184 */ 185 switch (dst->sa_family) { 186 #ifdef INET 187 case AF_INET: 188 if (!arpresolve(ifp, rt, m, dst, edst)) 189 return (0); /* if not yet resolved */ 190 eh->ether_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, edst)) 196 return (0); /* Something bad happenned. */ 197 eh->ether_type = htons(ETHERTYPE_IPV6); 198 break; 199 #endif 200 #ifdef IPX 201 case AF_IPX: 202 if (ef_outputp != NULL) { 203 error = ef_outputp(ifp, &m, dst, &eh->ether_type, 204 &hlen); 205 if (error) 206 goto bad; 207 } else { 208 eh->ether_type = htons(ETHERTYPE_IPX); 209 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 210 edst, ETHER_ADDR_LEN); 211 } 212 break; 213 #endif 214 #ifdef NETATALK 215 case AF_APPLETALK: { 216 struct at_ifaddr *aa; 217 218 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { 219 error = 0; /* XXX */ 220 goto bad; 221 } 222 /* 223 * In the phase 2 case, need to prepend an mbuf for 224 * the llc header. Since we must preserve the value 225 * of m, which is passed to us by value, we m_copy() 226 * 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), MB_DONTWAIT); 232 eh = mtod(m, struct ether_header *); 233 edst = eh->ether_dhost; 234 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 235 llc.llc_control = LLC_UI; 236 bcopy(at_org_code, llc.llc_snap_org_code, 237 sizeof at_org_code); 238 llc.llc_snap_ether_type = htons(ETHERTYPE_AT); 239 bcopy(&llc, 240 mtod(m, caddr_t) + sizeof(struct ether_header), 241 sizeof(struct llc)); 242 eh->ether_type = htons(m->m_pkthdr.len); 243 hlen = sizeof(struct llc) + ETHER_HDR_LEN; 244 } else { 245 eh->ether_type = htons(ETHERTYPE_AT); 246 } 247 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) 248 return (0); 249 break; 250 } 251 #endif 252 #ifdef NS 253 case AF_NS: 254 switch(ns_nettype) { 255 default: 256 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 257 eh->ether_type = 0x8137; 258 break; 259 case 0x0: /* Novell 802.3 */ 260 eh->ether_type = htons(m->m_pkthdr.len); 261 break; 262 case 0xe0e0: /* Novell 802.2 and Token-Ring */ 263 M_PREPEND(m, 3, MB_DONTWAIT); 264 eh = mtod(m, struct ether_header *); 265 edst = eh->ether_dhost; 266 eh->ether_type = htons(m->m_pkthdr.len); 267 cp = mtod(m, u_char *) + sizeof(struct ether_header); 268 *cp++ = 0xE0; 269 *cp++ = 0xE0; 270 *cp++ = 0x03; 271 break; 272 } 273 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), edst, 274 ETHER_ADDR_LEN); 275 /* 276 * XXX if ns_thishost is the same as the node's ethernet 277 * address then just the default code will catch this anyhow. 278 * So I'm not sure if this next clause should be here at all? 279 * [JRE] 280 */ 281 if (bcmp(edst, &ns_thishost, ETHER_ADDR_LEN) == 0) { 282 m->m_pkthdr.rcvif = ifp; 283 netisr_dispatch(NETISR_NS, m); 284 return (error); 285 } 286 if (bcmp(edst, &ns_broadhost, ETHER_ADDR_LEN) == 0) 287 m->m_flags |= M_BCAST; 288 break; 289 #endif 290 case pseudo_AF_HDRCMPLT: 291 case AF_UNSPEC: 292 loop_copy = -1; /* if this is for us, don't do it */ 293 deh = (struct ether_header *)dst->sa_data; 294 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN); 295 eh->ether_type = deh->ether_type; 296 break; 297 298 default: 299 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 300 gotoerr(EAFNOSUPPORT); 301 } 302 303 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */ 304 memcpy(eh->ether_shost, 305 ((struct ether_header *)dst->sa_data)->ether_shost, 306 ETHER_ADDR_LEN); 307 else 308 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN); 309 310 /* 311 * Bridges require special output handling. 312 */ 313 if (ifp->if_bridge) { 314 KASSERT(bridge_output_p != NULL, 315 ("%s: if_bridge not loaded!", __func__)); 316 return ((*bridge_output_p)(ifp, m, NULL, NULL)); 317 } 318 319 /* 320 * If a simplex interface, and the packet is being sent to our 321 * Ethernet address or a broadcast address, loopback a copy. 322 * XXX To make a simplex device behave exactly like a duplex 323 * device, we should copy in the case of sending to our own 324 * ethernet address (thus letting the original actually appear 325 * on the wire). However, we don't do that here for security 326 * reasons and compatibility with the original behavior. 327 */ 328 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 329 int csum_flags = 0; 330 331 if (m->m_pkthdr.csum_flags & CSUM_IP) 332 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 333 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 334 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 335 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 336 struct mbuf *n; 337 338 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) { 339 n->m_pkthdr.csum_flags |= csum_flags; 340 if (csum_flags & CSUM_DATA_VALID) 341 n->m_pkthdr.csum_data = 0xffff; 342 if_simloop(ifp, n, dst->sa_family, hlen); 343 } else 344 ifp->if_iqdrops++; 345 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 346 ETHER_ADDR_LEN) == 0) { 347 m->m_pkthdr.csum_flags |= csum_flags; 348 if (csum_flags & CSUM_DATA_VALID) 349 m->m_pkthdr.csum_data = 0xffff; 350 if_simloop(ifp, m, dst->sa_family, hlen); 351 return (0); /* XXX */ 352 } 353 } 354 355 #ifdef CARP 356 if (ifp->if_carp && (error = carp_output(ifp, m, dst, NULL))) 357 goto bad; 358 #endif 359 360 361 /* Handle ng_ether(4) processing, if any */ 362 if (ng_ether_output_p != NULL) { 363 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) 364 goto bad; 365 if (m == NULL) 366 return (0); 367 } 368 369 /* Continue with link-layer output */ 370 return ether_output_frame(ifp, m); 371 372 bad: 373 m_freem(m); 374 return (error); 375 } 376 377 /* 378 * Ethernet link layer output routine to send a raw frame to the device. 379 * 380 * This assumes that the 14 byte Ethernet header is present and contiguous 381 * in the first mbuf. 382 */ 383 int 384 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 385 { 386 struct ip_fw *rule = NULL; 387 int error = 0; 388 struct altq_pktattr pktattr; 389 390 ASSERT_SERIALIZED(ifp->if_serializer); 391 392 /* Extract info from dummynet tag, ignore others */ 393 while (m->m_type == MT_TAG) { 394 if (m->m_flags == PACKET_TAG_DUMMYNET) { 395 rule = ((struct dn_pkt *)m)->rule; 396 break; 397 } 398 m = m->m_next; 399 } 400 401 if (ifq_is_enabled(&ifp->if_snd)) 402 altq_etherclassify(&ifp->if_snd, m, &pktattr); 403 crit_enter(); 404 if (IPFW_LOADED && ether_ipfw != 0) { 405 struct ether_header save_eh, *eh; 406 407 eh = mtod(m, struct ether_header *); 408 save_eh = *eh; 409 m_adj(m, ETHER_HDR_LEN); 410 if (!ether_ipfw_chk(&m, ifp, &rule, eh, FALSE)) { 411 crit_exit(); 412 if (m != NULL) { 413 m_freem(m); 414 return ENOBUFS; /* pkt dropped */ 415 } else 416 return 0; /* consumed e.g. in a pipe */ 417 } 418 eh = mtod(m, struct ether_header *); 419 /* packet was ok, restore the ethernet header */ 420 if ((void *)(eh + 1) == (void *)m->m_data) { 421 m->m_data -= ETHER_HDR_LEN ; 422 m->m_len += ETHER_HDR_LEN ; 423 m->m_pkthdr.len += ETHER_HDR_LEN ; 424 } else { 425 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 426 if (m == NULL) /* nope... */ { 427 crit_exit(); 428 return ENOBUFS; 429 } 430 bcopy(&save_eh, mtod(m, struct ether_header *), 431 ETHER_HDR_LEN); 432 } 433 } 434 crit_exit(); 435 436 /* 437 * Queue message on interface, update output statistics if 438 * successful, and start output if interface not yet active. 439 */ 440 error = ifq_handoff(ifp, m, &pktattr); 441 return (error); 442 } 443 444 /* 445 * ipfw processing for ethernet packets (in and out). 446 * The second parameter is NULL from ether_demux(), and ifp from 447 * ether_output_frame(). 448 */ 449 static boolean_t 450 ether_ipfw_chk( 451 struct mbuf **m0, 452 struct ifnet *dst, 453 struct ip_fw **rule, 454 const struct ether_header *eh, 455 boolean_t shared) 456 { 457 struct ether_header save_eh = *eh; /* might be a ptr in m */ 458 struct ip_fw_args args; 459 struct m_tag *mtag; 460 int i; 461 462 if (*rule != NULL && fw_one_pass) 463 return TRUE; /* dummynet packet, already partially processed */ 464 465 /* 466 * I need some amount of data to be contiguous, and in case others 467 * need the packet (shared==TRUE), it also better be in the first mbuf. 468 */ 469 i = min((*m0)->m_pkthdr.len, max_protohdr); 470 if (shared || (*m0)->m_len < i) { 471 *m0 = m_pullup(*m0, i); 472 if (*m0 == NULL) 473 return FALSE; 474 } 475 476 args.m = *m0; /* the packet we are looking at */ 477 args.oif = dst; /* destination, if any */ 478 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL) 479 m_tag_delete(*m0, mtag); 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 FALSE; 489 490 if (i == 0) /* a PASS rule. */ 491 return TRUE; 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 FALSE; 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 ((const 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) 519 return FALSE; 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 FALSE; 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 FALSE; 532 } 533 534 /* 535 * Process a received Ethernet packet. 536 * 537 * The ethernet header is assumed to be in the mbuf so the caller 538 * MUST MAKE SURE that there are at least sizeof(struct ether_header) 539 * bytes in the first mbuf. 540 * 541 * This allows us to concentrate in one place a bunch of code which 542 * is replicated in all device drivers. Also, many functions called 543 * from ether_input() try to put the eh back into the mbuf, so we 544 * can later propagate the 'contiguous packet' interface to them. 545 * 546 * NOTA BENE: for all 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 to the 551 * upper layers with ether_demux(). 552 */ 553 void 554 ether_input(struct ifnet *ifp, struct mbuf *m) 555 { 556 struct ether_header *eh; 557 558 ASSERT_SERIALIZED(ifp->if_serializer); 559 560 if (m->m_len < sizeof(struct ether_header)) { 561 /* XXX error in the caller. */ 562 m_freem(m); 563 return; 564 } 565 m->m_pkthdr.rcvif = ifp; 566 567 BPF_MTAP(ifp, m); 568 569 ifp->if_ibytes += m->m_pkthdr.len; 570 571 if (ifp->if_flags & IFF_MONITOR) { 572 /* 573 * Interface marked for monitoring; discard packet. 574 */ 575 m_freem(m); 576 return; 577 } 578 579 /* 580 * Tap the packet off here for a bridge. bridge_input() 581 * will return NULL if it has consumed the packet, otherwise 582 * it gets processed as normal. Note that bridge_input() 583 * will always return the original packet if we need to 584 * process it locally. 585 */ 586 if (ifp->if_bridge) { 587 KASSERT(bridge_input_p != NULL, 588 ("%s: if_bridge not loaded!", __func__)); 589 590 if(m->m_flags & M_PROTO1) { 591 m->m_flags &= ~M_PROTO1; 592 } else { 593 /* clear M_PROMISC, in case the packets comes from a vlan */ 594 /* m->m_flags &= ~M_PROMISC; */ 595 lwkt_serialize_exit(ifp->if_serializer); 596 m = (*bridge_input_p)(ifp, m); 597 lwkt_serialize_enter(ifp->if_serializer); 598 if (m == NULL) 599 return; 600 601 KASSERT(ifp == m->m_pkthdr.rcvif, 602 ("bridge_input_p changed rcvif\n")); 603 } 604 } 605 606 eh = mtod(m, struct ether_header *); 607 608 /* XXX old crufty stuff, needs to be removed */ 609 m_adj(m, sizeof(struct ether_header)); 610 /* XXX */ 611 /* m->m_pkthdr.len = m->m_len; */ 612 613 /* Handle ng_ether(4) processing, if any */ 614 if (ng_ether_input_p != NULL) { 615 lwkt_serialize_exit(ifp->if_serializer); 616 (*ng_ether_input_p)(ifp, &m, eh); 617 lwkt_serialize_enter(ifp->if_serializer); 618 if (m == NULL) 619 return; 620 } 621 622 /* Continue with upper layer processing */ 623 ether_demux(ifp, eh, m); 624 } 625 626 /* 627 * Upper layer processing for a received Ethernet packet. 628 */ 629 void 630 ether_demux(struct ifnet *ifp, struct ether_header *eh0, struct mbuf *m) 631 { 632 struct ether_header eh; 633 int isr; 634 u_short ether_type; 635 struct ip_fw *rule = NULL; 636 #ifdef NETATALK 637 struct llc *l; 638 #endif 639 640 eh = *eh0; 641 642 /* Extract info from dummynet tag, ignore others */ 643 while (m->m_type == MT_TAG) { 644 if (m->m_flags == PACKET_TAG_DUMMYNET) { 645 rule = ((struct dn_pkt *)m)->rule; 646 ifp = m->m_next->m_pkthdr.rcvif; 647 break; 648 } 649 m = m->m_next; 650 } 651 if (rule) /* packet is passing the second time */ 652 goto post_stats; 653 654 #ifdef CARP 655 /* 656 * XXX: Okay, we need to call carp_forus() and - if it is for 657 * us jump over code that does the normal check 658 * "ac_enaddr == ether_dhost". The check sequence is a bit 659 * different from OpenBSD, so we jump over as few code as 660 * possible, to catch _all_ sanity checks. This needs 661 * evaluation, to see if the carp ether_dhost values break any 662 * of these checks! 663 */ 664 if (ifp->if_carp && carp_forus(ifp->if_carp, eh.ether_dhost)) 665 goto pre_stats; 666 #endif 667 668 /* 669 * Discard packet if upper layers shouldn't see it because 670 * it was unicast to a different Ethernet address. If the 671 * driver is working properly, then this situation can only 672 * happen when the interface is in promiscuous mode. 673 */ 674 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) && 675 (eh.ether_dhost[0] & 1) == 0 && 676 bcmp(eh.ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) { 677 m_freem(m); 678 return; 679 } 680 681 #ifdef CARP 682 pre_stats: 683 #endif 684 685 /* Discard packet if interface is not up */ 686 if (!(ifp->if_flags & IFF_UP)) { 687 m_freem(m); 688 return; 689 } 690 if (eh.ether_dhost[0] & 1) { 691 if (bcmp(ifp->if_broadcastaddr, eh.ether_dhost, 692 ifp->if_addrlen) == 0) 693 m->m_flags |= M_BCAST; 694 else 695 m->m_flags |= M_MCAST; 696 ifp->if_imcasts++; 697 } 698 699 post_stats: 700 if (IPFW_LOADED && ether_ipfw != 0) { 701 if (!ether_ipfw_chk(&m, NULL, &rule, &eh, FALSE)) { 702 m_freem(m); 703 return; 704 } 705 } 706 707 ether_type = ntohs(eh.ether_type); 708 709 switch (ether_type) { 710 #ifdef INET 711 case ETHERTYPE_IP: 712 if (ipflow_fastforward(m, ifp->if_serializer)) 713 return; 714 isr = NETISR_IP; 715 break; 716 717 case ETHERTYPE_ARP: 718 if (ifp->if_flags & IFF_NOARP) { 719 /* Discard packet if ARP is disabled on interface */ 720 m_freem(m); 721 return; 722 } 723 isr = NETISR_ARP; 724 break; 725 #endif 726 727 #ifdef INET6 728 case ETHERTYPE_IPV6: 729 isr = NETISR_IPV6; 730 break; 731 #endif 732 733 #ifdef IPX 734 case ETHERTYPE_IPX: 735 if (ef_inputp && ef_inputp(ifp, &eh, m) == 0) 736 return; 737 isr = NETISR_IPX; 738 break; 739 #endif 740 741 #ifdef NS 742 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 743 isr = NETISR_NS; 744 break; 745 746 #endif 747 748 #ifdef NETATALK 749 case ETHERTYPE_AT: 750 isr = NETISR_ATALK1; 751 break; 752 case ETHERTYPE_AARP: 753 isr = NETISR_AARP; 754 break; 755 #endif 756 757 case ETHERTYPE_VLAN: 758 if (vlan_input_p != NULL) 759 (*vlan_input_p)(&eh, m); 760 else { 761 m->m_pkthdr.rcvif->if_noproto++; 762 m_freem(m); 763 } 764 return; 765 766 default: 767 #ifdef IPX 768 if (ef_inputp && ef_inputp(ifp, &eh, m) == 0) 769 return; 770 #endif 771 #ifdef NS 772 checksum = mtod(m, ushort *); 773 /* Novell 802.3 */ 774 if ((ether_type <= ETHERMTU) && 775 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) { 776 if (*checksum == 0xE0E0) { 777 m->m_pkthdr.len -= 3; 778 m->m_len -= 3; 779 m->m_data += 3; 780 } 781 isr = NETISR_NS; 782 break; 783 } 784 #endif 785 #ifdef NETATALK 786 if (ether_type > ETHERMTU) 787 goto dropanyway; 788 l = mtod(m, struct llc *); 789 if (l->llc_dsap == LLC_SNAP_LSAP && 790 l->llc_ssap == LLC_SNAP_LSAP && 791 l->llc_control == LLC_UI) { 792 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code, 793 sizeof at_org_code) == 0 && 794 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 795 m_adj(m, sizeof(struct llc)); 796 isr = NETISR_ATALK2; 797 break; 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 isr = NETISR_AARP; 804 break; 805 } 806 } 807 dropanyway: 808 #endif 809 if (ng_ether_input_orphan_p != NULL) 810 (*ng_ether_input_orphan_p)(ifp, m, &eh); 811 else 812 m_freem(m); 813 return; 814 } 815 netisr_dispatch(isr, m); 816 } 817 818 /* 819 * Perform common duties while attaching to interface list 820 */ 821 822 void 823 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer) 824 { 825 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header), 826 serializer); 827 } 828 829 void 830 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen, 831 lwkt_serialize_t serializer) 832 { 833 struct sockaddr_dl *sdl; 834 835 ifp->if_type = IFT_ETHER; 836 ifp->if_addrlen = ETHER_ADDR_LEN; 837 ifp->if_hdrlen = ETHER_HDR_LEN; 838 if_attach(ifp, serializer); 839 ifp->if_mtu = ETHERMTU; 840 if (ifp->if_baudrate == 0) 841 ifp->if_baudrate = 10000000; 842 ifp->if_output = ether_output; 843 ifp->if_input = ether_input; 844 ifp->if_resolvemulti = ether_resolvemulti; 845 ifp->if_broadcastaddr = etherbroadcastaddr; 846 sdl = IF_LLSOCKADDR(ifp); 847 sdl->sdl_type = IFT_ETHER; 848 sdl->sdl_alen = ifp->if_addrlen; 849 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 850 /* 851 * XXX Keep the current drivers happy. 852 * XXX Remove once all drivers have been cleaned up 853 */ 854 if (lla != IFP2AC(ifp)->ac_enaddr) 855 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 856 bpfattach(ifp, dlt, hdrlen); 857 if (ng_ether_attach_p != NULL) 858 (*ng_ether_attach_p)(ifp); 859 860 if_printf(ifp, "MAC address: %6D\n", lla, ":"); 861 } 862 863 /* 864 * Perform common duties while detaching an Ethernet interface 865 */ 866 void 867 ether_ifdetach(struct ifnet *ifp) 868 { 869 if_down(ifp); 870 871 if (ng_ether_detach_p != NULL) 872 (*ng_ether_detach_p)(ifp); 873 bpfdetach(ifp); 874 if_detach(ifp); 875 } 876 877 int 878 ether_ioctl(struct ifnet *ifp, int command, caddr_t data) 879 { 880 struct ifaddr *ifa = (struct ifaddr *) data; 881 struct ifreq *ifr = (struct ifreq *) data; 882 int error = 0; 883 884 #define IF_INIT(ifp) \ 885 do { \ 886 if (((ifp)->if_flags & IFF_UP) == 0) { \ 887 (ifp)->if_flags |= IFF_UP; \ 888 (ifp)->if_init((ifp)->if_softc); \ 889 } \ 890 } while (0) 891 892 ASSERT_SERIALIZED(ifp->if_serializer); 893 894 switch (command) { 895 case SIOCSIFADDR: 896 switch (ifa->ifa_addr->sa_family) { 897 #ifdef INET 898 case AF_INET: 899 IF_INIT(ifp); /* before arpwhohas */ 900 arp_ifinit(ifp, ifa); 901 break; 902 #endif 903 #ifdef IPX 904 /* 905 * XXX - This code is probably wrong 906 */ 907 case AF_IPX: 908 { 909 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr; 910 struct arpcom *ac = IFP2AC(ifp); 911 912 if (ipx_nullhost(*ina)) 913 ina->x_host = *(union ipx_host *) ac->ac_enaddr; 914 else 915 bcopy(ina->x_host.c_host, ac->ac_enaddr, 916 sizeof ac->ac_enaddr); 917 918 IF_INIT(ifp); /* Set new address. */ 919 break; 920 } 921 #endif 922 #ifdef NS 923 /* 924 * XXX - This code is probably wrong 925 */ 926 case AF_NS: 927 { 928 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr); 929 struct arpcom *ac = IFP2AC(ifp); 930 931 if (ns_nullhost(*ina)) 932 ina->x_host = *(union ns_host *)(ac->ac_enaddr); 933 else 934 bcopy(ina->x_host.c_host, ac->ac_enaddr, 935 sizeof ac->ac_enaddr); 936 937 /* 938 * Set new address 939 */ 940 IF_INIT(ifp); 941 break; 942 } 943 #endif 944 default: 945 IF_INIT(ifp); 946 break; 947 } 948 break; 949 950 case SIOCGIFADDR: 951 bcopy(IFP2AC(ifp)->ac_enaddr, 952 ((struct sockaddr *)ifr->ifr_data)->sa_data, 953 ETHER_ADDR_LEN); 954 break; 955 956 case SIOCSIFMTU: 957 /* 958 * Set the interface MTU. 959 */ 960 if (ifr->ifr_mtu > ETHERMTU) { 961 error = EINVAL; 962 } else { 963 ifp->if_mtu = ifr->ifr_mtu; 964 } 965 break; 966 default: 967 error = EINVAL; 968 break; 969 } 970 return (error); 971 972 #undef IF_INIT 973 } 974 975 int 976 ether_resolvemulti( 977 struct ifnet *ifp, 978 struct sockaddr **llsa, 979 struct sockaddr *sa) 980 { 981 struct sockaddr_dl *sdl; 982 struct sockaddr_in *sin; 983 #ifdef INET6 984 struct sockaddr_in6 *sin6; 985 #endif 986 u_char *e_addr; 987 988 switch(sa->sa_family) { 989 case AF_LINK: 990 /* 991 * No mapping needed. Just check that it's a valid MC address. 992 */ 993 sdl = (struct sockaddr_dl *)sa; 994 e_addr = LLADDR(sdl); 995 if ((e_addr[0] & 1) != 1) 996 return EADDRNOTAVAIL; 997 *llsa = 0; 998 return 0; 999 1000 #ifdef INET 1001 case AF_INET: 1002 sin = (struct sockaddr_in *)sa; 1003 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 1004 return EADDRNOTAVAIL; 1005 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1006 M_WAITOK | M_ZERO); 1007 sdl->sdl_len = sizeof *sdl; 1008 sdl->sdl_family = AF_LINK; 1009 sdl->sdl_index = ifp->if_index; 1010 sdl->sdl_type = IFT_ETHER; 1011 sdl->sdl_alen = ETHER_ADDR_LEN; 1012 e_addr = LLADDR(sdl); 1013 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 1014 *llsa = (struct sockaddr *)sdl; 1015 return 0; 1016 #endif 1017 #ifdef INET6 1018 case AF_INET6: 1019 sin6 = (struct sockaddr_in6 *)sa; 1020 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1021 /* 1022 * An IP6 address of 0 means listen to all 1023 * of the Ethernet multicast address used for IP6. 1024 * (This is used for multicast routers.) 1025 */ 1026 ifp->if_flags |= IFF_ALLMULTI; 1027 *llsa = 0; 1028 return 0; 1029 } 1030 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 1031 return EADDRNOTAVAIL; 1032 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 1033 M_WAITOK | M_ZERO); 1034 sdl->sdl_len = sizeof *sdl; 1035 sdl->sdl_family = AF_LINK; 1036 sdl->sdl_index = ifp->if_index; 1037 sdl->sdl_type = IFT_ETHER; 1038 sdl->sdl_alen = ETHER_ADDR_LEN; 1039 e_addr = LLADDR(sdl); 1040 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 1041 *llsa = (struct sockaddr *)sdl; 1042 return 0; 1043 #endif 1044 1045 default: 1046 /* 1047 * Well, the text isn't quite right, but it's the name 1048 * that counts... 1049 */ 1050 return EAFNOSUPPORT; 1051 } 1052 } 1053 1054 #if 0 1055 /* 1056 * This is for reference. We have a table-driven version 1057 * of the little-endian crc32 generator, which is faster 1058 * than the double-loop. 1059 */ 1060 uint32_t 1061 ether_crc32_le(const uint8_t *buf, size_t len) 1062 { 1063 uint32_t c, crc, carry; 1064 size_t i, j; 1065 1066 crc = 0xffffffffU; /* initial value */ 1067 1068 for (i = 0; i < len; i++) { 1069 c = buf[i]; 1070 for (j = 0; j < 8; j++) { 1071 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1072 crc >>= 1; 1073 c >>= 1; 1074 if (carry) 1075 crc = (crc ^ ETHER_CRC_POLY_LE); 1076 } 1077 } 1078 1079 return (crc); 1080 } 1081 #else 1082 uint32_t 1083 ether_crc32_le(const uint8_t *buf, size_t len) 1084 { 1085 static const uint32_t crctab[] = { 1086 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1087 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1088 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1089 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1090 }; 1091 uint32_t crc; 1092 size_t i; 1093 1094 crc = 0xffffffffU; /* initial value */ 1095 1096 for (i = 0; i < len; i++) { 1097 crc ^= buf[i]; 1098 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1099 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1100 } 1101 1102 return (crc); 1103 } 1104 #endif 1105 1106 uint32_t 1107 ether_crc32_be(const uint8_t *buf, size_t len) 1108 { 1109 uint32_t c, crc, carry; 1110 size_t i, j; 1111 1112 crc = 0xffffffffU; /* initial value */ 1113 1114 for (i = 0; i < len; i++) { 1115 c = buf[i]; 1116 for (j = 0; j < 8; j++) { 1117 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1118 crc <<= 1; 1119 c >>= 1; 1120 if (carry) 1121 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1122 } 1123 } 1124 1125 return (crc); 1126 } 1127 1128 /* 1129 * find the size of ethernet header, and call classifier 1130 */ 1131 void 1132 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 1133 struct altq_pktattr *pktattr) 1134 { 1135 struct ether_header *eh; 1136 uint16_t ether_type; 1137 int hlen, af, hdrsize; 1138 caddr_t hdr; 1139 1140 hlen = sizeof(struct ether_header); 1141 eh = mtod(m, struct ether_header *); 1142 1143 ether_type = ntohs(eh->ether_type); 1144 if (ether_type < ETHERMTU) { 1145 /* ick! LLC/SNAP */ 1146 struct llc *llc = (struct llc *)(eh + 1); 1147 hlen += 8; 1148 1149 if (m->m_len < hlen || 1150 llc->llc_dsap != LLC_SNAP_LSAP || 1151 llc->llc_ssap != LLC_SNAP_LSAP || 1152 llc->llc_control != LLC_UI) 1153 goto bad; /* not snap! */ 1154 1155 ether_type = ntohs(llc->llc_un.type_snap.ether_type); 1156 } 1157 1158 if (ether_type == ETHERTYPE_IP) { 1159 af = AF_INET; 1160 hdrsize = 20; /* sizeof(struct ip) */ 1161 #ifdef INET6 1162 } else if (ether_type == ETHERTYPE_IPV6) { 1163 af = AF_INET6; 1164 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 1165 #endif 1166 } else 1167 goto bad; 1168 1169 while (m->m_len <= hlen) { 1170 hlen -= m->m_len; 1171 m = m->m_next; 1172 } 1173 hdr = m->m_data + hlen; 1174 if (m->m_len < hlen + hdrsize) { 1175 /* 1176 * ip header is not in a single mbuf. this should not 1177 * happen in the current code. 1178 * (todo: use m_pulldown in the future) 1179 */ 1180 goto bad; 1181 } 1182 m->m_data += hlen; 1183 m->m_len -= hlen; 1184 ifq_classify(ifq, m, af, pktattr); 1185 m->m_data -= hlen; 1186 m->m_len += hlen; 1187 1188 return; 1189 1190 bad: 1191 pktattr->pattr_class = NULL; 1192 pktattr->pattr_hdr = NULL; 1193 pktattr->pattr_af = AF_UNSPEC; 1194 } 1195