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 1.90 2008/09/20 10:53:16 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_mpls.h" 43 #include "opt_netgraph.h" 44 #include "opt_carp.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/globaldata.h> 49 #include <sys/kernel.h> 50 #include <sys/ktr.h> 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/msgport.h> 54 #include <sys/socket.h> 55 #include <sys/sockio.h> 56 #include <sys/sysctl.h> 57 #include <sys/thread.h> 58 #include <sys/thread2.h> 59 60 #include <net/if.h> 61 #include <net/netisr.h> 62 #include <net/route.h> 63 #include <net/if_llc.h> 64 #include <net/if_dl.h> 65 #include <net/if_types.h> 66 #include <net/ifq_var.h> 67 #include <net/bpf.h> 68 #include <net/ethernet.h> 69 #include <net/vlan/if_vlan_ether.h> 70 #include <net/netmsg2.h> 71 72 #if defined(INET) || defined(INET6) 73 #include <netinet/in.h> 74 #include <netinet/in_var.h> 75 #include <netinet/if_ether.h> 76 #include <net/ipfw/ip_fw.h> 77 #include <net/dummynet/ip_dummynet.h> 78 #endif 79 #ifdef INET6 80 #include <netinet6/nd6.h> 81 #endif 82 83 #ifdef CARP 84 #include <netinet/ip_carp.h> 85 #endif 86 87 #ifdef IPX 88 #include <netproto/ipx/ipx.h> 89 #include <netproto/ipx/ipx_if.h> 90 int (*ef_inputp)(struct ifnet*, const struct ether_header *eh, struct mbuf *m); 91 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, 92 short *tp, int *hlen); 93 #endif 94 95 #ifdef NS 96 #include <netns/ns.h> 97 #include <netns/ns_if.h> 98 ushort ns_nettype; 99 int ether_outputdebug = 0; 100 int ether_inputdebug = 0; 101 #endif 102 103 #ifdef NETATALK 104 #include <netproto/atalk/at.h> 105 #include <netproto/atalk/at_var.h> 106 #include <netproto/atalk/at_extern.h> 107 108 #define llc_snap_org_code llc_un.type_snap.org_code 109 #define llc_snap_ether_type llc_un.type_snap.ether_type 110 111 extern u_char at_org_code[3]; 112 extern u_char aarp_org_code[3]; 113 #endif /* NETATALK */ 114 115 #ifdef MPLS 116 #include <netproto/mpls/mpls.h> 117 #endif 118 119 /* netgraph node hooks for ng_ether(4) */ 120 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 121 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, 122 struct mbuf *m, const struct ether_header *eh); 123 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 124 void (*ng_ether_attach_p)(struct ifnet *ifp); 125 void (*ng_ether_detach_p)(struct ifnet *ifp); 126 127 void (*vlan_input_p)(struct mbuf *); 128 129 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *, 130 struct rtentry *); 131 static void ether_restore_header(struct mbuf **, const struct ether_header *, 132 const struct ether_header *); 133 134 /* 135 * if_bridge support 136 */ 137 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *); 138 int (*bridge_output_p)(struct ifnet *, struct mbuf *); 139 void (*bridge_dn_p)(struct mbuf *, struct ifnet *); 140 141 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 142 struct sockaddr *); 143 144 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = { 145 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 146 }; 147 148 #define gotoerr(e) do { error = (e); goto bad; } while (0) 149 #define IFP2AC(ifp) ((struct arpcom *)(ifp)) 150 151 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 152 struct ip_fw **rule, 153 const struct ether_header *eh); 154 155 static int ether_ipfw; 156 static u_int ether_restore_hdr; 157 static u_int ether_prepend_hdr; 158 159 SYSCTL_DECL(_net_link); 160 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 161 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 162 ðer_ipfw, 0, "Pass ether pkts through firewall"); 163 SYSCTL_UINT(_net_link_ether, OID_AUTO, restore_hdr, CTLFLAG_RW, 164 ðer_restore_hdr, 0, "# of ether header restoration"); 165 SYSCTL_UINT(_net_link_ether, OID_AUTO, prepend_hdr, CTLFLAG_RW, 166 ðer_prepend_hdr, 0, 167 "# of ether header restoration which prepends mbuf"); 168 169 #define ETHER_KTR_STR "ifp=%p" 170 #define ETHER_KTR_ARG_SIZE (sizeof(void *)) 171 #ifndef KTR_ETHERNET 172 #define KTR_ETHERNET KTR_ALL 173 #endif 174 KTR_INFO_MASTER(ether); 175 KTR_INFO(KTR_ETHERNET, ether, chain_beg, 0, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE); 176 KTR_INFO(KTR_ETHERNET, ether, chain_end, 1, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE); 177 KTR_INFO(KTR_ETHERNET, ether, disp_beg, 2, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE); 178 KTR_INFO(KTR_ETHERNET, ether, disp_end, 3, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE); 179 #define logether(name, arg) KTR_LOG(ether_ ## name, arg) 180 181 /* 182 * Ethernet output routine. 183 * Encapsulate a packet of type family for the local net. 184 * Use trailer local net encapsulation if enough data in first 185 * packet leaves a multiple of 512 bytes of data in remainder. 186 * Assumes that ifp is actually pointer to arpcom structure. 187 */ 188 static int 189 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 190 struct rtentry *rt) 191 { 192 struct ether_header *eh, *deh; 193 u_char *edst; 194 int loop_copy = 0; 195 int hlen = ETHER_HDR_LEN; /* link layer header length */ 196 struct arpcom *ac = IFP2AC(ifp); 197 int error; 198 199 ASSERT_NOT_SERIALIZED(ifp->if_serializer); 200 201 if (ifp->if_flags & IFF_MONITOR) 202 gotoerr(ENETDOWN); 203 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 204 gotoerr(ENETDOWN); 205 206 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT); 207 if (m == NULL) 208 return (ENOBUFS); 209 eh = mtod(m, struct ether_header *); 210 edst = eh->ether_dhost; 211 212 /* 213 * Fill in the destination ethernet address and frame type. 214 */ 215 switch (dst->sa_family) { 216 #ifdef INET 217 case AF_INET: 218 if (!arpresolve(ifp, rt, m, dst, edst)) 219 return (0); /* if not yet resolved */ 220 #ifdef MPLS 221 if (m->m_flags & M_MPLSLABELED) 222 eh->ether_type = htons(ETHERTYPE_MPLS); 223 else 224 #endif 225 eh->ether_type = htons(ETHERTYPE_IP); 226 break; 227 #endif 228 #ifdef INET6 229 case AF_INET6: 230 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst)) 231 return (0); /* Something bad happenned. */ 232 eh->ether_type = htons(ETHERTYPE_IPV6); 233 break; 234 #endif 235 #ifdef IPX 236 case AF_IPX: 237 if (ef_outputp != NULL) { 238 error = ef_outputp(ifp, &m, dst, &eh->ether_type, 239 &hlen); 240 if (error) 241 goto bad; 242 } else { 243 eh->ether_type = htons(ETHERTYPE_IPX); 244 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 245 edst, ETHER_ADDR_LEN); 246 } 247 break; 248 #endif 249 #ifdef NETATALK 250 case AF_APPLETALK: { 251 struct at_ifaddr *aa; 252 253 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { 254 error = 0; /* XXX */ 255 goto bad; 256 } 257 /* 258 * In the phase 2 case, need to prepend an mbuf for 259 * the llc header. Since we must preserve the value 260 * of m, which is passed to us by value, we m_copy() 261 * the first mbuf, and use it for our llc header. 262 */ 263 if (aa->aa_flags & AFA_PHASE2) { 264 struct llc llc; 265 266 M_PREPEND(m, sizeof(struct llc), MB_DONTWAIT); 267 eh = mtod(m, struct ether_header *); 268 edst = eh->ether_dhost; 269 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 270 llc.llc_control = LLC_UI; 271 bcopy(at_org_code, llc.llc_snap_org_code, 272 sizeof at_org_code); 273 llc.llc_snap_ether_type = htons(ETHERTYPE_AT); 274 bcopy(&llc, 275 mtod(m, caddr_t) + sizeof(struct ether_header), 276 sizeof(struct llc)); 277 eh->ether_type = htons(m->m_pkthdr.len); 278 hlen = sizeof(struct llc) + ETHER_HDR_LEN; 279 } else { 280 eh->ether_type = htons(ETHERTYPE_AT); 281 } 282 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) 283 return (0); 284 break; 285 } 286 #endif 287 #ifdef NS 288 case AF_NS: 289 switch(ns_nettype) { 290 default: 291 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 292 eh->ether_type = 0x8137; 293 break; 294 case 0x0: /* Novell 802.3 */ 295 eh->ether_type = htons(m->m_pkthdr.len); 296 break; 297 case 0xe0e0: /* Novell 802.2 and Token-Ring */ 298 M_PREPEND(m, 3, MB_DONTWAIT); 299 eh = mtod(m, struct ether_header *); 300 edst = eh->ether_dhost; 301 eh->ether_type = htons(m->m_pkthdr.len); 302 cp = mtod(m, u_char *) + sizeof(struct ether_header); 303 *cp++ = 0xE0; 304 *cp++ = 0xE0; 305 *cp++ = 0x03; 306 break; 307 } 308 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), edst, 309 ETHER_ADDR_LEN); 310 /* 311 * XXX if ns_thishost is the same as the node's ethernet 312 * address then just the default code will catch this anyhow. 313 * So I'm not sure if this next clause should be here at all? 314 * [JRE] 315 */ 316 if (bcmp(edst, &ns_thishost, ETHER_ADDR_LEN) == 0) { 317 m->m_pkthdr.rcvif = ifp; 318 netisr_dispatch(NETISR_NS, m); 319 return (error); 320 } 321 if (bcmp(edst, &ns_broadhost, ETHER_ADDR_LEN) == 0) 322 m->m_flags |= M_BCAST; 323 break; 324 #endif 325 case pseudo_AF_HDRCMPLT: 326 case AF_UNSPEC: 327 loop_copy = -1; /* if this is for us, don't do it */ 328 deh = (struct ether_header *)dst->sa_data; 329 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN); 330 eh->ether_type = deh->ether_type; 331 break; 332 333 default: 334 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 335 gotoerr(EAFNOSUPPORT); 336 } 337 338 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */ 339 memcpy(eh->ether_shost, 340 ((struct ether_header *)dst->sa_data)->ether_shost, 341 ETHER_ADDR_LEN); 342 else 343 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN); 344 345 /* 346 * Bridges require special output handling. 347 */ 348 if (ifp->if_bridge) { 349 KASSERT(bridge_output_p != NULL, 350 ("%s: if_bridge not loaded!", __func__)); 351 return bridge_output_p(ifp, m); 352 } 353 354 /* 355 * If a simplex interface, and the packet is being sent to our 356 * Ethernet address or a broadcast address, loopback a copy. 357 * XXX To make a simplex device behave exactly like a duplex 358 * device, we should copy in the case of sending to our own 359 * ethernet address (thus letting the original actually appear 360 * on the wire). However, we don't do that here for security 361 * reasons and compatibility with the original behavior. 362 */ 363 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 364 int csum_flags = 0; 365 366 if (m->m_pkthdr.csum_flags & CSUM_IP) 367 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 368 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 369 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 370 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 371 struct mbuf *n; 372 373 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) { 374 n->m_pkthdr.csum_flags |= csum_flags; 375 if (csum_flags & CSUM_DATA_VALID) 376 n->m_pkthdr.csum_data = 0xffff; 377 if_simloop(ifp, n, dst->sa_family, hlen); 378 } else 379 ifp->if_iqdrops++; 380 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 381 ETHER_ADDR_LEN) == 0) { 382 m->m_pkthdr.csum_flags |= csum_flags; 383 if (csum_flags & CSUM_DATA_VALID) 384 m->m_pkthdr.csum_data = 0xffff; 385 if_simloop(ifp, m, dst->sa_family, hlen); 386 return (0); /* XXX */ 387 } 388 } 389 390 #ifdef CARP 391 if (ifp->if_carp && (error = carp_output(ifp, m, dst, NULL))) 392 goto bad; 393 #endif 394 395 396 /* Handle ng_ether(4) processing, if any */ 397 if (ng_ether_output_p != NULL) { 398 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) 399 goto bad; 400 if (m == NULL) 401 return (0); 402 } 403 404 /* Continue with link-layer output */ 405 return ether_output_frame(ifp, m); 406 407 bad: 408 m_freem(m); 409 return (error); 410 } 411 412 /* 413 * Ethernet link layer output routine to send a raw frame to the device. 414 * 415 * This assumes that the 14 byte Ethernet header is present and contiguous 416 * in the first mbuf. 417 */ 418 int 419 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 420 { 421 struct ip_fw *rule = NULL; 422 int error = 0; 423 struct altq_pktattr pktattr; 424 425 ASSERT_NOT_SERIALIZED(ifp->if_serializer); 426 427 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 428 struct m_tag *mtag; 429 430 /* Extract info from dummynet tag */ 431 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 432 KKASSERT(mtag != NULL); 433 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 434 KKASSERT(rule != NULL); 435 436 m_tag_delete(m, mtag); 437 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 438 } 439 440 if (ifq_is_enabled(&ifp->if_snd)) 441 altq_etherclassify(&ifp->if_snd, m, &pktattr); 442 crit_enter(); 443 if (IPFW_LOADED && ether_ipfw != 0) { 444 struct ether_header save_eh, *eh; 445 446 eh = mtod(m, struct ether_header *); 447 save_eh = *eh; 448 m_adj(m, ETHER_HDR_LEN); 449 if (!ether_ipfw_chk(&m, ifp, &rule, eh)) { 450 crit_exit(); 451 if (m != NULL) { 452 m_freem(m); 453 return ENOBUFS; /* pkt dropped */ 454 } else 455 return 0; /* consumed e.g. in a pipe */ 456 } 457 458 /* packet was ok, restore the ethernet header */ 459 ether_restore_header(&m, eh, &save_eh); 460 if (m == NULL) { 461 crit_exit(); 462 return ENOBUFS; 463 } 464 } 465 crit_exit(); 466 467 /* 468 * Queue message on interface, update output statistics if 469 * successful, and start output if interface not yet active. 470 */ 471 error = ifq_dispatch(ifp, m, &pktattr); 472 return (error); 473 } 474 475 /* 476 * ipfw processing for ethernet packets (in and out). 477 * The second parameter is NULL from ether_demux(), and ifp from 478 * ether_output_frame(). 479 */ 480 static boolean_t 481 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, struct ip_fw **rule, 482 const struct ether_header *eh) 483 { 484 struct ether_header save_eh = *eh; /* might be a ptr in *m0 */ 485 struct ip_fw_args args; 486 struct m_tag *mtag; 487 struct mbuf *m; 488 int i; 489 490 if (*rule != NULL && fw_one_pass) 491 return TRUE; /* dummynet packet, already partially processed */ 492 493 /* 494 * I need some amount of data to be contiguous. 495 */ 496 i = min((*m0)->m_pkthdr.len, max_protohdr); 497 if ((*m0)->m_len < i) { 498 *m0 = m_pullup(*m0, i); 499 if (*m0 == NULL) 500 return FALSE; 501 } 502 503 /* 504 * Clean up tags 505 */ 506 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL) 507 m_tag_delete(*m0, mtag); 508 if ((*m0)->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) { 509 mtag = m_tag_find(*m0, PACKET_TAG_IPFORWARD, NULL); 510 KKASSERT(mtag != NULL); 511 m_tag_delete(*m0, mtag); 512 (*m0)->m_pkthdr.fw_flags &= ~IPFORWARD_MBUF_TAGGED; 513 } 514 515 args.m = *m0; /* the packet we are looking at */ 516 args.oif = dst; /* destination, if any */ 517 args.rule = *rule; /* matching rule to restart */ 518 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 519 i = ip_fw_chk_ptr(&args); 520 *m0 = args.m; 521 *rule = args.rule; 522 523 if (*m0 == NULL) 524 return FALSE; 525 526 switch (i) { 527 case IP_FW_PASS: 528 return TRUE; 529 530 case IP_FW_DIVERT: 531 case IP_FW_TEE: 532 case IP_FW_DENY: 533 /* 534 * XXX at some point add support for divert/forward actions. 535 * If none of the above matches, we have to drop the pkt. 536 */ 537 return FALSE; 538 539 case IP_FW_DUMMYNET: 540 /* 541 * Pass the pkt to dummynet, which consumes it. 542 */ 543 m = *m0; /* pass the original to dummynet */ 544 *m0 = NULL; /* and nothing back to the caller */ 545 546 ether_restore_header(&m, eh, &save_eh); 547 if (m == NULL) 548 return FALSE; 549 550 ip_fw_dn_io_ptr(m, args.cookie, 551 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 552 ip_dn_queue(m); 553 return FALSE; 554 555 default: 556 panic("unknown ipfw return value: %d\n", i); 557 } 558 } 559 560 static void 561 ether_input(struct ifnet *ifp, struct mbuf *m) 562 { 563 ether_input_chain(ifp, m, NULL); 564 } 565 566 /* 567 * Perform common duties while attaching to interface list 568 */ 569 void 570 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer) 571 { 572 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header), 573 serializer); 574 } 575 576 void 577 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen, 578 lwkt_serialize_t serializer) 579 { 580 struct sockaddr_dl *sdl; 581 582 ifp->if_type = IFT_ETHER; 583 ifp->if_addrlen = ETHER_ADDR_LEN; 584 ifp->if_hdrlen = ETHER_HDR_LEN; 585 if_attach(ifp, serializer); 586 ifp->if_mtu = ETHERMTU; 587 if (ifp->if_baudrate == 0) 588 ifp->if_baudrate = 10000000; 589 ifp->if_output = ether_output; 590 ifp->if_input = ether_input; 591 ifp->if_resolvemulti = ether_resolvemulti; 592 ifp->if_broadcastaddr = etherbroadcastaddr; 593 sdl = IF_LLSOCKADDR(ifp); 594 sdl->sdl_type = IFT_ETHER; 595 sdl->sdl_alen = ifp->if_addrlen; 596 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 597 /* 598 * XXX Keep the current drivers happy. 599 * XXX Remove once all drivers have been cleaned up 600 */ 601 if (lla != IFP2AC(ifp)->ac_enaddr) 602 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 603 bpfattach(ifp, dlt, hdrlen); 604 if (ng_ether_attach_p != NULL) 605 (*ng_ether_attach_p)(ifp); 606 607 if_printf(ifp, "MAC address: %6D\n", lla, ":"); 608 } 609 610 /* 611 * Perform common duties while detaching an Ethernet interface 612 */ 613 void 614 ether_ifdetach(struct ifnet *ifp) 615 { 616 if_down(ifp); 617 618 if (ng_ether_detach_p != NULL) 619 (*ng_ether_detach_p)(ifp); 620 bpfdetach(ifp); 621 if_detach(ifp); 622 } 623 624 int 625 ether_ioctl(struct ifnet *ifp, int command, caddr_t data) 626 { 627 struct ifaddr *ifa = (struct ifaddr *) data; 628 struct ifreq *ifr = (struct ifreq *) data; 629 int error = 0; 630 631 #define IF_INIT(ifp) \ 632 do { \ 633 if (((ifp)->if_flags & IFF_UP) == 0) { \ 634 (ifp)->if_flags |= IFF_UP; \ 635 (ifp)->if_init((ifp)->if_softc); \ 636 } \ 637 } while (0) 638 639 ASSERT_SERIALIZED(ifp->if_serializer); 640 641 switch (command) { 642 case SIOCSIFADDR: 643 switch (ifa->ifa_addr->sa_family) { 644 #ifdef INET 645 case AF_INET: 646 IF_INIT(ifp); /* before arpwhohas */ 647 arp_ifinit(ifp, ifa); 648 break; 649 #endif 650 #ifdef IPX 651 /* 652 * XXX - This code is probably wrong 653 */ 654 case AF_IPX: 655 { 656 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr; 657 struct arpcom *ac = IFP2AC(ifp); 658 659 if (ipx_nullhost(*ina)) 660 ina->x_host = *(union ipx_host *) ac->ac_enaddr; 661 else 662 bcopy(ina->x_host.c_host, ac->ac_enaddr, 663 sizeof ac->ac_enaddr); 664 665 IF_INIT(ifp); /* Set new address. */ 666 break; 667 } 668 #endif 669 #ifdef NS 670 /* 671 * XXX - This code is probably wrong 672 */ 673 case AF_NS: 674 { 675 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr); 676 struct arpcom *ac = IFP2AC(ifp); 677 678 if (ns_nullhost(*ina)) 679 ina->x_host = *(union ns_host *)(ac->ac_enaddr); 680 else 681 bcopy(ina->x_host.c_host, ac->ac_enaddr, 682 sizeof ac->ac_enaddr); 683 684 /* 685 * Set new address 686 */ 687 IF_INIT(ifp); 688 break; 689 } 690 #endif 691 default: 692 IF_INIT(ifp); 693 break; 694 } 695 break; 696 697 case SIOCGIFADDR: 698 bcopy(IFP2AC(ifp)->ac_enaddr, 699 ((struct sockaddr *)ifr->ifr_data)->sa_data, 700 ETHER_ADDR_LEN); 701 break; 702 703 case SIOCSIFMTU: 704 /* 705 * Set the interface MTU. 706 */ 707 if (ifr->ifr_mtu > ETHERMTU) { 708 error = EINVAL; 709 } else { 710 ifp->if_mtu = ifr->ifr_mtu; 711 } 712 break; 713 default: 714 error = EINVAL; 715 break; 716 } 717 return (error); 718 719 #undef IF_INIT 720 } 721 722 int 723 ether_resolvemulti( 724 struct ifnet *ifp, 725 struct sockaddr **llsa, 726 struct sockaddr *sa) 727 { 728 struct sockaddr_dl *sdl; 729 struct sockaddr_in *sin; 730 #ifdef INET6 731 struct sockaddr_in6 *sin6; 732 #endif 733 u_char *e_addr; 734 735 switch(sa->sa_family) { 736 case AF_LINK: 737 /* 738 * No mapping needed. Just check that it's a valid MC address. 739 */ 740 sdl = (struct sockaddr_dl *)sa; 741 e_addr = LLADDR(sdl); 742 if ((e_addr[0] & 1) != 1) 743 return EADDRNOTAVAIL; 744 *llsa = 0; 745 return 0; 746 747 #ifdef INET 748 case AF_INET: 749 sin = (struct sockaddr_in *)sa; 750 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 751 return EADDRNOTAVAIL; 752 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 753 M_WAITOK | M_ZERO); 754 sdl->sdl_len = sizeof *sdl; 755 sdl->sdl_family = AF_LINK; 756 sdl->sdl_index = ifp->if_index; 757 sdl->sdl_type = IFT_ETHER; 758 sdl->sdl_alen = ETHER_ADDR_LEN; 759 e_addr = LLADDR(sdl); 760 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 761 *llsa = (struct sockaddr *)sdl; 762 return 0; 763 #endif 764 #ifdef INET6 765 case AF_INET6: 766 sin6 = (struct sockaddr_in6 *)sa; 767 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 768 /* 769 * An IP6 address of 0 means listen to all 770 * of the Ethernet multicast address used for IP6. 771 * (This is used for multicast routers.) 772 */ 773 ifp->if_flags |= IFF_ALLMULTI; 774 *llsa = 0; 775 return 0; 776 } 777 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 778 return EADDRNOTAVAIL; 779 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 780 M_WAITOK | M_ZERO); 781 sdl->sdl_len = sizeof *sdl; 782 sdl->sdl_family = AF_LINK; 783 sdl->sdl_index = ifp->if_index; 784 sdl->sdl_type = IFT_ETHER; 785 sdl->sdl_alen = ETHER_ADDR_LEN; 786 e_addr = LLADDR(sdl); 787 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 788 *llsa = (struct sockaddr *)sdl; 789 return 0; 790 #endif 791 792 default: 793 /* 794 * Well, the text isn't quite right, but it's the name 795 * that counts... 796 */ 797 return EAFNOSUPPORT; 798 } 799 } 800 801 #if 0 802 /* 803 * This is for reference. We have a table-driven version 804 * of the little-endian crc32 generator, which is faster 805 * than the double-loop. 806 */ 807 uint32_t 808 ether_crc32_le(const uint8_t *buf, size_t len) 809 { 810 uint32_t c, crc, carry; 811 size_t i, j; 812 813 crc = 0xffffffffU; /* initial value */ 814 815 for (i = 0; i < len; i++) { 816 c = buf[i]; 817 for (j = 0; j < 8; j++) { 818 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 819 crc >>= 1; 820 c >>= 1; 821 if (carry) 822 crc = (crc ^ ETHER_CRC_POLY_LE); 823 } 824 } 825 826 return (crc); 827 } 828 #else 829 uint32_t 830 ether_crc32_le(const uint8_t *buf, size_t len) 831 { 832 static const uint32_t crctab[] = { 833 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 834 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 835 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 836 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 837 }; 838 uint32_t crc; 839 size_t i; 840 841 crc = 0xffffffffU; /* initial value */ 842 843 for (i = 0; i < len; i++) { 844 crc ^= buf[i]; 845 crc = (crc >> 4) ^ crctab[crc & 0xf]; 846 crc = (crc >> 4) ^ crctab[crc & 0xf]; 847 } 848 849 return (crc); 850 } 851 #endif 852 853 uint32_t 854 ether_crc32_be(const uint8_t *buf, size_t len) 855 { 856 uint32_t c, crc, carry; 857 size_t i, j; 858 859 crc = 0xffffffffU; /* initial value */ 860 861 for (i = 0; i < len; i++) { 862 c = buf[i]; 863 for (j = 0; j < 8; j++) { 864 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 865 crc <<= 1; 866 c >>= 1; 867 if (carry) 868 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 869 } 870 } 871 872 return (crc); 873 } 874 875 /* 876 * find the size of ethernet header, and call classifier 877 */ 878 void 879 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 880 struct altq_pktattr *pktattr) 881 { 882 struct ether_header *eh; 883 uint16_t ether_type; 884 int hlen, af, hdrsize; 885 caddr_t hdr; 886 887 hlen = sizeof(struct ether_header); 888 eh = mtod(m, struct ether_header *); 889 890 ether_type = ntohs(eh->ether_type); 891 if (ether_type < ETHERMTU) { 892 /* ick! LLC/SNAP */ 893 struct llc *llc = (struct llc *)(eh + 1); 894 hlen += 8; 895 896 if (m->m_len < hlen || 897 llc->llc_dsap != LLC_SNAP_LSAP || 898 llc->llc_ssap != LLC_SNAP_LSAP || 899 llc->llc_control != LLC_UI) 900 goto bad; /* not snap! */ 901 902 ether_type = ntohs(llc->llc_un.type_snap.ether_type); 903 } 904 905 if (ether_type == ETHERTYPE_IP) { 906 af = AF_INET; 907 hdrsize = 20; /* sizeof(struct ip) */ 908 #ifdef INET6 909 } else if (ether_type == ETHERTYPE_IPV6) { 910 af = AF_INET6; 911 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 912 #endif 913 } else 914 goto bad; 915 916 while (m->m_len <= hlen) { 917 hlen -= m->m_len; 918 m = m->m_next; 919 } 920 hdr = m->m_data + hlen; 921 if (m->m_len < hlen + hdrsize) { 922 /* 923 * ip header is not in a single mbuf. this should not 924 * happen in the current code. 925 * (todo: use m_pulldown in the future) 926 */ 927 goto bad; 928 } 929 m->m_data += hlen; 930 m->m_len -= hlen; 931 ifq_classify(ifq, m, af, pktattr); 932 m->m_data -= hlen; 933 m->m_len += hlen; 934 935 return; 936 937 bad: 938 pktattr->pattr_class = NULL; 939 pktattr->pattr_hdr = NULL; 940 pktattr->pattr_af = AF_UNSPEC; 941 } 942 943 static void 944 ether_restore_header(struct mbuf **m0, const struct ether_header *eh, 945 const struct ether_header *save_eh) 946 { 947 struct mbuf *m = *m0; 948 949 ether_restore_hdr++; 950 951 /* 952 * Prepend the header, optimize for the common case of 953 * eh pointing into the mbuf. 954 */ 955 if ((const void *)(eh + 1) == (void *)m->m_data) { 956 m->m_data -= ETHER_HDR_LEN; 957 m->m_len += ETHER_HDR_LEN; 958 m->m_pkthdr.len += ETHER_HDR_LEN; 959 } else { 960 ether_prepend_hdr++; 961 962 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 963 if (m != NULL) { 964 bcopy(save_eh, mtod(m, struct ether_header *), 965 ETHER_HDR_LEN); 966 } 967 } 968 *m0 = m; 969 } 970 971 static void 972 ether_input_ipifunc(void *arg) 973 { 974 struct mbuf *m, *next; 975 lwkt_port_t port; 976 977 m = arg; 978 do { 979 next = m->m_nextpkt; 980 m->m_nextpkt = NULL; 981 982 port = m->m_pkthdr.header; 983 m->m_pkthdr.header = NULL; 984 985 lwkt_sendmsg(port, 986 &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg); 987 988 m = next; 989 } while (m != NULL); 990 } 991 992 void 993 ether_input_dispatch(struct mbuf_chain *chain) 994 { 995 #ifdef SMP 996 int i; 997 998 logether(disp_beg, NULL); 999 for (i = 0; i < ncpus; ++i) { 1000 if (chain[i].mc_head != NULL) { 1001 lwkt_send_ipiq(globaldata_find(i), 1002 ether_input_ipifunc, chain[i].mc_head); 1003 } 1004 } 1005 #else 1006 logether(disp_beg, NULL); 1007 if (chain->mc_head != NULL) 1008 ether_input_ipifunc(chain->mc_head); 1009 #endif 1010 logether(disp_end, NULL); 1011 } 1012 1013 void 1014 ether_input_chain_init(struct mbuf_chain *chain) 1015 { 1016 #ifdef SMP 1017 int i; 1018 1019 for (i = 0; i < ncpus; ++i) 1020 chain[i].mc_head = chain[i].mc_tail = NULL; 1021 #else 1022 chain->mc_head = chain->mc_tail = NULL; 1023 #endif 1024 } 1025 1026 /* 1027 * Upper layer processing for a received Ethernet packet. 1028 */ 1029 void 1030 ether_demux_oncpu(struct ifnet *ifp, struct mbuf *m) 1031 { 1032 struct ether_header *eh; 1033 int isr, redispatch; 1034 u_short ether_type; 1035 struct ip_fw *rule = NULL; 1036 #ifdef NETATALK 1037 struct llc *l; 1038 #endif 1039 1040 M_ASSERTPKTHDR(m); 1041 KASSERT(m->m_len >= ETHER_HDR_LEN, 1042 ("ether header is no contiguous!\n")); 1043 1044 eh = mtod(m, struct ether_header *); 1045 1046 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 1047 struct m_tag *mtag; 1048 1049 /* Extract info from dummynet tag */ 1050 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 1051 KKASSERT(mtag != NULL); 1052 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 1053 KKASSERT(rule != NULL); 1054 1055 m_tag_delete(m, mtag); 1056 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 1057 1058 /* packet is passing the second time */ 1059 goto post_stats; 1060 } 1061 1062 #ifdef CARP 1063 /* 1064 * XXX: Okay, we need to call carp_forus() and - if it is for 1065 * us jump over code that does the normal check 1066 * "ac_enaddr == ether_dhost". The check sequence is a bit 1067 * different from OpenBSD, so we jump over as few code as 1068 * possible, to catch _all_ sanity checks. This needs 1069 * evaluation, to see if the carp ether_dhost values break any 1070 * of these checks! 1071 */ 1072 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost)) 1073 goto post_stats; 1074 #endif 1075 1076 /* 1077 * Discard packet if upper layers shouldn't see it because 1078 * it was unicast to a different Ethernet address. If the 1079 * driver is working properly, then this situation can only 1080 * happen when the interface is in promiscuous mode. 1081 */ 1082 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) && 1083 (eh->ether_dhost[0] & 1) == 0 && 1084 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) { 1085 m_freem(m); 1086 return; 1087 } 1088 1089 post_stats: 1090 if (IPFW_LOADED && ether_ipfw != 0) { 1091 struct ether_header save_eh = *eh; 1092 1093 /* XXX old crufty stuff, needs to be removed */ 1094 m_adj(m, sizeof(struct ether_header)); 1095 1096 if (!ether_ipfw_chk(&m, NULL, &rule, eh)) { 1097 m_freem(m); 1098 return; 1099 } 1100 1101 ether_restore_header(&m, eh, &save_eh); 1102 if (m == NULL) 1103 return; 1104 eh = mtod(m, struct ether_header *); 1105 } 1106 1107 ether_type = ntohs(eh->ether_type); 1108 KKASSERT(ether_type != ETHERTYPE_VLAN); 1109 1110 if (m->m_flags & M_VLANTAG) { 1111 if (vlan_input_p != NULL) { 1112 vlan_input_p(m); 1113 } else { 1114 m->m_pkthdr.rcvif->if_noproto++; 1115 m_freem(m); 1116 } 1117 return; 1118 } 1119 1120 m_adj(m, sizeof(struct ether_header)); 1121 redispatch = 0; 1122 1123 switch (ether_type) { 1124 #ifdef INET 1125 case ETHERTYPE_IP: 1126 if (ipflow_fastforward(m)) 1127 return; 1128 isr = NETISR_IP; 1129 break; 1130 1131 case ETHERTYPE_ARP: 1132 if (ifp->if_flags & IFF_NOARP) { 1133 /* Discard packet if ARP is disabled on interface */ 1134 m_freem(m); 1135 return; 1136 } 1137 isr = NETISR_ARP; 1138 break; 1139 #endif 1140 1141 #ifdef INET6 1142 case ETHERTYPE_IPV6: 1143 isr = NETISR_IPV6; 1144 break; 1145 #endif 1146 1147 #ifdef IPX 1148 case ETHERTYPE_IPX: 1149 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 1150 return; 1151 isr = NETISR_IPX; 1152 break; 1153 #endif 1154 1155 #ifdef NS 1156 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 1157 isr = NETISR_NS; 1158 break; 1159 1160 #endif 1161 1162 #ifdef NETATALK 1163 case ETHERTYPE_AT: 1164 isr = NETISR_ATALK1; 1165 break; 1166 case ETHERTYPE_AARP: 1167 isr = NETISR_AARP; 1168 break; 1169 #endif 1170 1171 #ifdef MPLS 1172 case ETHERTYPE_MPLS: 1173 case ETHERTYPE_MPLS_MCAST: 1174 /* Should have been set by ether_input_chain(). */ 1175 KKASSERT(m->m_flags & M_MPLSLABELED); 1176 isr = NETISR_MPLS; 1177 break; 1178 #endif 1179 1180 default: 1181 /* 1182 * The accurate msgport is not determined before 1183 * we reach here, so redo the dispatching 1184 */ 1185 redispatch = 1; 1186 #ifdef IPX 1187 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 1188 return; 1189 #endif 1190 #ifdef NS 1191 checksum = mtod(m, ushort *); 1192 /* Novell 802.3 */ 1193 if ((ether_type <= ETHERMTU) && 1194 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) { 1195 if (*checksum == 0xE0E0) { 1196 m->m_pkthdr.len -= 3; 1197 m->m_len -= 3; 1198 m->m_data += 3; 1199 } 1200 isr = NETISR_NS; 1201 break; 1202 } 1203 #endif 1204 #ifdef NETATALK 1205 if (ether_type > ETHERMTU) 1206 goto dropanyway; 1207 l = mtod(m, struct llc *); 1208 if (l->llc_dsap == LLC_SNAP_LSAP && 1209 l->llc_ssap == LLC_SNAP_LSAP && 1210 l->llc_control == LLC_UI) { 1211 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code, 1212 sizeof at_org_code) == 0 && 1213 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 1214 m_adj(m, sizeof(struct llc)); 1215 isr = NETISR_ATALK2; 1216 break; 1217 } 1218 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 1219 sizeof aarp_org_code) == 0 && 1220 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 1221 m_adj(m, sizeof(struct llc)); 1222 isr = NETISR_AARP; 1223 break; 1224 } 1225 } 1226 dropanyway: 1227 #endif 1228 if (ng_ether_input_orphan_p != NULL) 1229 ng_ether_input_orphan_p(ifp, m, eh); 1230 else 1231 m_freem(m); 1232 return; 1233 } 1234 1235 if (!redispatch) 1236 netisr_run(isr, m); 1237 else 1238 netisr_dispatch(isr, m); 1239 } 1240 1241 /* 1242 * First we perform any link layer operations, then continue to the 1243 * upper layers with ether_demux_oncpu(). 1244 */ 1245 void 1246 ether_input_oncpu(struct ifnet *ifp, struct mbuf *m) 1247 { 1248 if ((ifp->if_flags & (IFF_UP | IFF_MONITOR)) != IFF_UP) { 1249 /* 1250 * Receiving interface's flags are changed, when this 1251 * packet is waiting for processing; discard it. 1252 */ 1253 m_freem(m); 1254 return; 1255 } 1256 1257 /* 1258 * Tap the packet off here for a bridge. bridge_input() 1259 * will return NULL if it has consumed the packet, otherwise 1260 * it gets processed as normal. Note that bridge_input() 1261 * will always return the original packet if we need to 1262 * process it locally. 1263 */ 1264 if (ifp->if_bridge) { 1265 KASSERT(bridge_input_p != NULL, 1266 ("%s: if_bridge not loaded!", __func__)); 1267 1268 if(m->m_flags & M_PROTO1) { 1269 m->m_flags &= ~M_PROTO1; 1270 } else { 1271 /* clear M_PROMISC, in case the packets comes from a vlan */ 1272 /* m->m_flags &= ~M_PROMISC; */ 1273 m = bridge_input_p(ifp, m); 1274 if (m == NULL) 1275 return; 1276 1277 KASSERT(ifp == m->m_pkthdr.rcvif, 1278 ("bridge_input_p changed rcvif\n")); 1279 } 1280 } 1281 1282 /* Handle ng_ether(4) processing, if any */ 1283 if (ng_ether_input_p != NULL) { 1284 ng_ether_input_p(ifp, &m); 1285 if (m == NULL) 1286 return; 1287 } 1288 1289 /* Continue with upper layer processing */ 1290 ether_demux_oncpu(ifp, m); 1291 } 1292 1293 static void 1294 ether_input_handler(struct netmsg *nmsg) 1295 { 1296 struct netmsg_packet *nmp = (struct netmsg_packet *)nmsg; 1297 struct ifnet *ifp; 1298 struct mbuf *m; 1299 1300 m = nmp->nm_packet; 1301 M_ASSERTPKTHDR(m); 1302 ifp = m->m_pkthdr.rcvif; 1303 1304 ether_input_oncpu(ifp, m); 1305 } 1306 1307 static __inline void 1308 ether_init_netpacket(int num, struct mbuf *m) 1309 { 1310 struct netmsg_packet *pmsg; 1311 1312 pmsg = &m->m_hdr.mh_netmsg; 1313 netmsg_init(&pmsg->nm_netmsg, &netisr_apanic_rport, 0, 1314 ether_input_handler); 1315 pmsg->nm_packet = m; 1316 pmsg->nm_netmsg.nm_lmsg.u.ms_result = num; 1317 } 1318 1319 static __inline struct lwkt_port * 1320 ether_mport(int num, struct mbuf **m) 1321 { 1322 if (num == NETISR_MAX) { 1323 /* 1324 * All packets whose target msgports can't be 1325 * determined here are dispatched to netisr0, 1326 * where further dispatching may happen. 1327 */ 1328 return cpu_portfn(0); 1329 } 1330 return netisr_find_port(num, m); 1331 } 1332 1333 /* 1334 * Process a received Ethernet packet. 1335 * 1336 * The ethernet header is assumed to be in the mbuf so the caller 1337 * MUST MAKE SURE that there are at least sizeof(struct ether_header) 1338 * bytes in the first mbuf. 1339 * 1340 * We first try to find the target msgport for this ether frame, if 1341 * there is no target msgport for it, this ether frame is discarded, 1342 * else we do following processing according to whether 'chain' is 1343 * NULL or not: 1344 * - If 'chain' is NULL, this ether frame is sent to the target msgport 1345 * immediately. This situation happens when ether_input_chain is 1346 * accessed through ifnet.if_input. 1347 * - If 'chain' is not NULL, this ether frame is queued to the 'chain' 1348 * bucket indexed by the target msgport's cpuid and the target msgport 1349 * is saved in mbuf's m_pkthdr.m_head. Caller of ether_input_chain 1350 * must initialize 'chain' by calling ether_input_chain_init(). 1351 * ether_input_dispatch must be called later to send ether frames 1352 * queued on 'chain' to their target msgport. 1353 */ 1354 void 1355 ether_input_chain(struct ifnet *ifp, struct mbuf *m, struct mbuf_chain *chain) 1356 { 1357 struct ether_header *eh, *save_eh, save_eh0; 1358 struct lwkt_port *port; 1359 uint16_t ether_type; 1360 int isr; 1361 1362 ASSERT_SERIALIZED(ifp->if_serializer); 1363 M_ASSERTPKTHDR(m); 1364 1365 /* Discard packet if interface is not up */ 1366 if (!(ifp->if_flags & IFF_UP)) { 1367 m_freem(m); 1368 return; 1369 } 1370 1371 if (m->m_len < sizeof(struct ether_header)) { 1372 /* XXX error in the caller. */ 1373 m_freem(m); 1374 return; 1375 } 1376 eh = mtod(m, struct ether_header *); 1377 1378 m->m_pkthdr.rcvif = ifp; 1379 1380 logether(chain_beg, ifp); 1381 1382 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1383 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost, 1384 ifp->if_addrlen) == 0) 1385 m->m_flags |= M_BCAST; 1386 else 1387 m->m_flags |= M_MCAST; 1388 ifp->if_imcasts++; 1389 } 1390 1391 ETHER_BPF_MTAP(ifp, m); 1392 1393 ifp->if_ibytes += m->m_pkthdr.len; 1394 1395 if (ifp->if_flags & IFF_MONITOR) { 1396 /* 1397 * Interface marked for monitoring; discard packet. 1398 */ 1399 m_freem(m); 1400 1401 logether(chain_end, ifp); 1402 return; 1403 } 1404 1405 if (ntohs(eh->ether_type) == ETHERTYPE_VLAN && 1406 (m->m_flags & M_VLANTAG) == 0) { 1407 /* 1408 * Extract vlan tag if hardware does not do it for us 1409 */ 1410 vlan_ether_decap(&m); 1411 if (m == NULL) 1412 return; 1413 eh = mtod(m, struct ether_header *); 1414 } 1415 ether_type = ntohs(eh->ether_type); 1416 1417 if ((m->m_flags & M_VLANTAG) && ether_type == ETHERTYPE_VLAN) { 1418 /* 1419 * To prevent possible dangerous recursion, 1420 * we don't do vlan-in-vlan 1421 */ 1422 ifp->if_noproto++; 1423 m_freem(m); 1424 return; 1425 } 1426 KKASSERT(ether_type != ETHERTYPE_VLAN); 1427 1428 /* 1429 * Map ether type to netisr id. 1430 */ 1431 switch (ether_type) { 1432 #ifdef INET 1433 case ETHERTYPE_IP: 1434 isr = NETISR_IP; 1435 break; 1436 1437 case ETHERTYPE_ARP: 1438 isr = NETISR_ARP; 1439 break; 1440 #endif 1441 1442 #ifdef INET6 1443 case ETHERTYPE_IPV6: 1444 isr = NETISR_IPV6; 1445 break; 1446 #endif 1447 1448 #ifdef IPX 1449 case ETHERTYPE_IPX: 1450 isr = NETISR_IPX; 1451 break; 1452 #endif 1453 1454 #ifdef NS 1455 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 1456 isr = NETISR_NS; 1457 break; 1458 #endif 1459 1460 #ifdef NETATALK 1461 case ETHERTYPE_AT: 1462 isr = NETISR_ATALK1; 1463 break; 1464 case ETHERTYPE_AARP: 1465 isr = NETISR_AARP; 1466 break; 1467 #endif 1468 1469 #ifdef MPLS 1470 case ETHERTYPE_MPLS: 1471 case ETHERTYPE_MPLS_MCAST: 1472 m->m_flags |= M_MPLSLABELED; 1473 isr = NETISR_MPLS; 1474 break; 1475 #endif 1476 1477 default: 1478 /* 1479 * NETISR_MAX is an invalid value; it is chosen to let 1480 * ether_mport() know that we are not able to decide 1481 * this packet's msgport here. 1482 */ 1483 isr = NETISR_MAX; 1484 break; 1485 } 1486 1487 /* 1488 * If the packet is in contiguous memory, following 1489 * m_adj() could ensure that the hidden ether header 1490 * will not be destroyed, else we will have to save 1491 * the ether header for the later restoration. 1492 */ 1493 if (m->m_pkthdr.len != m->m_len) { 1494 save_eh0 = *eh; 1495 save_eh = &save_eh0; 1496 } else { 1497 save_eh = NULL; 1498 } 1499 1500 /* 1501 * Temporarily remove ether header; ether_mport() 1502 * expects a packet without ether header. 1503 */ 1504 m_adj(m, sizeof(struct ether_header)); 1505 1506 /* 1507 * Find the packet's target msgport. 1508 */ 1509 port = ether_mport(isr, &m); 1510 if (port == NULL) { 1511 KKASSERT(m == NULL); 1512 return; 1513 } 1514 1515 /* 1516 * Restore ether header. 1517 */ 1518 if (save_eh != NULL) { 1519 ether_restore_header(&m, eh, save_eh); 1520 if (m == NULL) 1521 return; 1522 } else { 1523 m->m_data -= ETHER_HDR_LEN; 1524 m->m_len += ETHER_HDR_LEN; 1525 m->m_pkthdr.len += ETHER_HDR_LEN; 1526 } 1527 1528 /* 1529 * Initialize mbuf's netmsg packet _after_ possible 1530 * ether header restoration, else the initialized 1531 * netmsg packet may be lost during ether header 1532 * restoration. 1533 */ 1534 ether_init_netpacket(isr, m); 1535 1536 if (chain != NULL) { 1537 struct mbuf_chain *c; 1538 int cpuid; 1539 1540 m->m_pkthdr.header = port; /* XXX */ 1541 cpuid = port->mpu_td->td_gd->gd_cpuid; 1542 1543 c = &chain[cpuid]; 1544 if (c->mc_head == NULL) { 1545 c->mc_head = c->mc_tail = m; 1546 } else { 1547 c->mc_tail->m_nextpkt = m; 1548 c->mc_tail = m; 1549 } 1550 m->m_nextpkt = NULL; 1551 } else { 1552 lwkt_sendmsg(port, &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg); 1553 } 1554 logether(chain_end, ifp); 1555 } 1556