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 1.82 2008/08/05 15:11:32 nant 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 #include "opt_ethernet.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/globaldata.h> 50 #include <sys/kernel.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_input2_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 /* 170 * Ethernet output routine. 171 * Encapsulate a packet of type family for the local net. 172 * Use trailer local net encapsulation if enough data in first 173 * packet leaves a multiple of 512 bytes of data in remainder. 174 * Assumes that ifp is actually pointer to arpcom structure. 175 */ 176 static int 177 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 178 struct rtentry *rt) 179 { 180 struct ether_header *eh, *deh; 181 u_char *edst; 182 int loop_copy = 0; 183 int hlen = ETHER_HDR_LEN; /* link layer header length */ 184 struct arpcom *ac = IFP2AC(ifp); 185 int error; 186 187 ASSERT_NOT_SERIALIZED(ifp->if_serializer); 188 189 if (ifp->if_flags & IFF_MONITOR) 190 gotoerr(ENETDOWN); 191 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 192 gotoerr(ENETDOWN); 193 194 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT); 195 if (m == NULL) 196 return (ENOBUFS); 197 eh = mtod(m, struct ether_header *); 198 edst = eh->ether_dhost; 199 200 /* 201 * Fill in the destination ethernet address and frame type. 202 */ 203 switch (dst->sa_family) { 204 #ifdef INET 205 case AF_INET: 206 if (!arpresolve(ifp, rt, m, dst, edst)) 207 return (0); /* if not yet resolved */ 208 #ifdef MPLS 209 if (m->m_flags & M_MPLSLABELED) 210 eh->ether_type = htons(ETHERTYPE_MPLS); 211 else 212 #endif 213 eh->ether_type = htons(ETHERTYPE_IP); 214 break; 215 #endif 216 #ifdef INET6 217 case AF_INET6: 218 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst)) 219 return (0); /* Something bad happenned. */ 220 eh->ether_type = htons(ETHERTYPE_IPV6); 221 break; 222 #endif 223 #ifdef IPX 224 case AF_IPX: 225 if (ef_outputp != NULL) { 226 error = ef_outputp(ifp, &m, dst, &eh->ether_type, 227 &hlen); 228 if (error) 229 goto bad; 230 } else { 231 eh->ether_type = htons(ETHERTYPE_IPX); 232 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 233 edst, ETHER_ADDR_LEN); 234 } 235 break; 236 #endif 237 #ifdef NETATALK 238 case AF_APPLETALK: { 239 struct at_ifaddr *aa; 240 241 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { 242 error = 0; /* XXX */ 243 goto bad; 244 } 245 /* 246 * In the phase 2 case, need to prepend an mbuf for 247 * the llc header. Since we must preserve the value 248 * of m, which is passed to us by value, we m_copy() 249 * the first mbuf, and use it for our llc header. 250 */ 251 if (aa->aa_flags & AFA_PHASE2) { 252 struct llc llc; 253 254 M_PREPEND(m, sizeof(struct llc), MB_DONTWAIT); 255 eh = mtod(m, struct ether_header *); 256 edst = eh->ether_dhost; 257 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 258 llc.llc_control = LLC_UI; 259 bcopy(at_org_code, llc.llc_snap_org_code, 260 sizeof at_org_code); 261 llc.llc_snap_ether_type = htons(ETHERTYPE_AT); 262 bcopy(&llc, 263 mtod(m, caddr_t) + sizeof(struct ether_header), 264 sizeof(struct llc)); 265 eh->ether_type = htons(m->m_pkthdr.len); 266 hlen = sizeof(struct llc) + ETHER_HDR_LEN; 267 } else { 268 eh->ether_type = htons(ETHERTYPE_AT); 269 } 270 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) 271 return (0); 272 break; 273 } 274 #endif 275 #ifdef NS 276 case AF_NS: 277 switch(ns_nettype) { 278 default: 279 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 280 eh->ether_type = 0x8137; 281 break; 282 case 0x0: /* Novell 802.3 */ 283 eh->ether_type = htons(m->m_pkthdr.len); 284 break; 285 case 0xe0e0: /* Novell 802.2 and Token-Ring */ 286 M_PREPEND(m, 3, MB_DONTWAIT); 287 eh = mtod(m, struct ether_header *); 288 edst = eh->ether_dhost; 289 eh->ether_type = htons(m->m_pkthdr.len); 290 cp = mtod(m, u_char *) + sizeof(struct ether_header); 291 *cp++ = 0xE0; 292 *cp++ = 0xE0; 293 *cp++ = 0x03; 294 break; 295 } 296 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), edst, 297 ETHER_ADDR_LEN); 298 /* 299 * XXX if ns_thishost is the same as the node's ethernet 300 * address then just the default code will catch this anyhow. 301 * So I'm not sure if this next clause should be here at all? 302 * [JRE] 303 */ 304 if (bcmp(edst, &ns_thishost, ETHER_ADDR_LEN) == 0) { 305 m->m_pkthdr.rcvif = ifp; 306 netisr_dispatch(NETISR_NS, m); 307 return (error); 308 } 309 if (bcmp(edst, &ns_broadhost, ETHER_ADDR_LEN) == 0) 310 m->m_flags |= M_BCAST; 311 break; 312 #endif 313 case pseudo_AF_HDRCMPLT: 314 case AF_UNSPEC: 315 loop_copy = -1; /* if this is for us, don't do it */ 316 deh = (struct ether_header *)dst->sa_data; 317 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN); 318 eh->ether_type = deh->ether_type; 319 break; 320 321 default: 322 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 323 gotoerr(EAFNOSUPPORT); 324 } 325 326 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */ 327 memcpy(eh->ether_shost, 328 ((struct ether_header *)dst->sa_data)->ether_shost, 329 ETHER_ADDR_LEN); 330 else 331 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN); 332 333 /* 334 * Bridges require special output handling. 335 */ 336 if (ifp->if_bridge) { 337 KASSERT(bridge_output_p != NULL, 338 ("%s: if_bridge not loaded!", __func__)); 339 return bridge_output_p(ifp, m); 340 } 341 342 /* 343 * If a simplex interface, and the packet is being sent to our 344 * Ethernet address or a broadcast address, loopback a copy. 345 * XXX To make a simplex device behave exactly like a duplex 346 * device, we should copy in the case of sending to our own 347 * ethernet address (thus letting the original actually appear 348 * on the wire). However, we don't do that here for security 349 * reasons and compatibility with the original behavior. 350 */ 351 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 352 int csum_flags = 0; 353 354 if (m->m_pkthdr.csum_flags & CSUM_IP) 355 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 356 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 357 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 358 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 359 struct mbuf *n; 360 361 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) { 362 n->m_pkthdr.csum_flags |= csum_flags; 363 if (csum_flags & CSUM_DATA_VALID) 364 n->m_pkthdr.csum_data = 0xffff; 365 if_simloop(ifp, n, dst->sa_family, hlen); 366 } else 367 ifp->if_iqdrops++; 368 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 369 ETHER_ADDR_LEN) == 0) { 370 m->m_pkthdr.csum_flags |= csum_flags; 371 if (csum_flags & CSUM_DATA_VALID) 372 m->m_pkthdr.csum_data = 0xffff; 373 if_simloop(ifp, m, dst->sa_family, hlen); 374 return (0); /* XXX */ 375 } 376 } 377 378 #ifdef CARP 379 if (ifp->if_carp && (error = carp_output(ifp, m, dst, NULL))) 380 goto bad; 381 #endif 382 383 384 /* Handle ng_ether(4) processing, if any */ 385 if (ng_ether_output_p != NULL) { 386 if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) 387 goto bad; 388 if (m == NULL) 389 return (0); 390 } 391 392 /* Continue with link-layer output */ 393 return ether_output_frame(ifp, m); 394 395 bad: 396 m_freem(m); 397 return (error); 398 } 399 400 /* 401 * Ethernet link layer output routine to send a raw frame to the device. 402 * 403 * This assumes that the 14 byte Ethernet header is present and contiguous 404 * in the first mbuf. 405 */ 406 int 407 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 408 { 409 struct ip_fw *rule = NULL; 410 int error = 0; 411 struct altq_pktattr pktattr; 412 struct m_tag *mtag; 413 414 ASSERT_NOT_SERIALIZED(ifp->if_serializer); 415 416 /* Extract info from dummynet tag */ 417 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 418 if (mtag != NULL) { 419 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 420 421 m_tag_delete(m, mtag); 422 mtag = NULL; 423 } 424 425 if (ifq_is_enabled(&ifp->if_snd)) 426 altq_etherclassify(&ifp->if_snd, m, &pktattr); 427 crit_enter(); 428 if (IPFW_LOADED && ether_ipfw != 0) { 429 struct ether_header save_eh, *eh; 430 431 eh = mtod(m, struct ether_header *); 432 save_eh = *eh; 433 m_adj(m, ETHER_HDR_LEN); 434 if (!ether_ipfw_chk(&m, ifp, &rule, eh)) { 435 crit_exit(); 436 if (m != NULL) { 437 m_freem(m); 438 return ENOBUFS; /* pkt dropped */ 439 } else 440 return 0; /* consumed e.g. in a pipe */ 441 } 442 443 /* packet was ok, restore the ethernet header */ 444 ether_restore_header(&m, eh, &save_eh); 445 if (m == NULL) { 446 crit_exit(); 447 return ENOBUFS; 448 } 449 } 450 crit_exit(); 451 452 /* 453 * Queue message on interface, update output statistics if 454 * successful, and start output if interface not yet active. 455 */ 456 error = ifq_dispatch(ifp, m, &pktattr); 457 return (error); 458 } 459 460 /* 461 * ipfw processing for ethernet packets (in and out). 462 * The second parameter is NULL from ether_demux(), and ifp from 463 * ether_output_frame(). 464 */ 465 static boolean_t 466 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, struct ip_fw **rule, 467 const struct ether_header *eh) 468 { 469 struct ether_header save_eh = *eh; /* might be a ptr in m */ 470 struct ip_fw_args args; 471 struct m_tag *mtag; 472 int i; 473 474 if (*rule != NULL && fw_one_pass) 475 return TRUE; /* dummynet packet, already partially processed */ 476 477 /* 478 * I need some amount of data to be contiguous. 479 */ 480 i = min((*m0)->m_pkthdr.len, max_protohdr); 481 if ((*m0)->m_len < i) { 482 *m0 = m_pullup(*m0, i); 483 if (*m0 == NULL) 484 return FALSE; 485 } 486 487 args.m = *m0; /* the packet we are looking at */ 488 args.oif = dst; /* destination, if any */ 489 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL) 490 m_tag_delete(*m0, mtag); 491 args.rule = *rule; /* matching rule to restart */ 492 args.next_hop = NULL; /* we do not support forward yet */ 493 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 494 i = ip_fw_chk_ptr(&args); 495 *m0 = args.m; 496 *rule = args.rule; 497 498 if ((i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */ 499 return FALSE; 500 501 if (i == 0) /* a PASS rule. */ 502 return TRUE; 503 504 if (i & IP_FW_PORT_DYNT_FLAG) { 505 /* 506 * Pass the pkt to dummynet, which consumes it. 507 */ 508 struct mbuf *m; 509 510 m = *m0; /* pass the original to dummynet */ 511 *m0 = NULL; /* and nothing back to the caller */ 512 513 ether_restore_header(&m, eh, &save_eh); 514 if (m == NULL) 515 return FALSE; 516 517 ip_fw_dn_io_ptr(m, (i & 0xffff), 518 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 519 return FALSE; 520 } 521 /* 522 * XXX at some point add support for divert/forward actions. 523 * If none of the above matches, we have to drop the pkt. 524 */ 525 return FALSE; 526 } 527 528 static void 529 ether_input(struct ifnet *ifp, struct mbuf *m) 530 { 531 ether_input_chain2(ifp, m, NULL); 532 } 533 534 /* 535 * Perform common duties while attaching to interface list 536 */ 537 void 538 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer) 539 { 540 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header), 541 serializer); 542 } 543 544 void 545 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen, 546 lwkt_serialize_t serializer) 547 { 548 struct sockaddr_dl *sdl; 549 550 ifp->if_type = IFT_ETHER; 551 ifp->if_addrlen = ETHER_ADDR_LEN; 552 ifp->if_hdrlen = ETHER_HDR_LEN; 553 if_attach(ifp, serializer); 554 ifp->if_mtu = ETHERMTU; 555 if (ifp->if_baudrate == 0) 556 ifp->if_baudrate = 10000000; 557 ifp->if_output = ether_output; 558 ifp->if_input = ether_input; 559 ifp->if_resolvemulti = ether_resolvemulti; 560 ifp->if_broadcastaddr = etherbroadcastaddr; 561 sdl = IF_LLSOCKADDR(ifp); 562 sdl->sdl_type = IFT_ETHER; 563 sdl->sdl_alen = ifp->if_addrlen; 564 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 565 /* 566 * XXX Keep the current drivers happy. 567 * XXX Remove once all drivers have been cleaned up 568 */ 569 if (lla != IFP2AC(ifp)->ac_enaddr) 570 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 571 bpfattach(ifp, dlt, hdrlen); 572 if (ng_ether_attach_p != NULL) 573 (*ng_ether_attach_p)(ifp); 574 575 if_printf(ifp, "MAC address: %6D\n", lla, ":"); 576 } 577 578 /* 579 * Perform common duties while detaching an Ethernet interface 580 */ 581 void 582 ether_ifdetach(struct ifnet *ifp) 583 { 584 if_down(ifp); 585 586 if (ng_ether_detach_p != NULL) 587 (*ng_ether_detach_p)(ifp); 588 bpfdetach(ifp); 589 if_detach(ifp); 590 } 591 592 int 593 ether_ioctl(struct ifnet *ifp, int command, caddr_t data) 594 { 595 struct ifaddr *ifa = (struct ifaddr *) data; 596 struct ifreq *ifr = (struct ifreq *) data; 597 int error = 0; 598 599 #define IF_INIT(ifp) \ 600 do { \ 601 if (((ifp)->if_flags & IFF_UP) == 0) { \ 602 (ifp)->if_flags |= IFF_UP; \ 603 (ifp)->if_init((ifp)->if_softc); \ 604 } \ 605 } while (0) 606 607 ASSERT_SERIALIZED(ifp->if_serializer); 608 609 switch (command) { 610 case SIOCSIFADDR: 611 switch (ifa->ifa_addr->sa_family) { 612 #ifdef INET 613 case AF_INET: 614 IF_INIT(ifp); /* before arpwhohas */ 615 arp_ifinit(ifp, ifa); 616 break; 617 #endif 618 #ifdef IPX 619 /* 620 * XXX - This code is probably wrong 621 */ 622 case AF_IPX: 623 { 624 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr; 625 struct arpcom *ac = IFP2AC(ifp); 626 627 if (ipx_nullhost(*ina)) 628 ina->x_host = *(union ipx_host *) ac->ac_enaddr; 629 else 630 bcopy(ina->x_host.c_host, ac->ac_enaddr, 631 sizeof ac->ac_enaddr); 632 633 IF_INIT(ifp); /* Set new address. */ 634 break; 635 } 636 #endif 637 #ifdef NS 638 /* 639 * XXX - This code is probably wrong 640 */ 641 case AF_NS: 642 { 643 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr); 644 struct arpcom *ac = IFP2AC(ifp); 645 646 if (ns_nullhost(*ina)) 647 ina->x_host = *(union ns_host *)(ac->ac_enaddr); 648 else 649 bcopy(ina->x_host.c_host, ac->ac_enaddr, 650 sizeof ac->ac_enaddr); 651 652 /* 653 * Set new address 654 */ 655 IF_INIT(ifp); 656 break; 657 } 658 #endif 659 default: 660 IF_INIT(ifp); 661 break; 662 } 663 break; 664 665 case SIOCGIFADDR: 666 bcopy(IFP2AC(ifp)->ac_enaddr, 667 ((struct sockaddr *)ifr->ifr_data)->sa_data, 668 ETHER_ADDR_LEN); 669 break; 670 671 case SIOCSIFMTU: 672 /* 673 * Set the interface MTU. 674 */ 675 if (ifr->ifr_mtu > ETHERMTU) { 676 error = EINVAL; 677 } else { 678 ifp->if_mtu = ifr->ifr_mtu; 679 } 680 break; 681 default: 682 error = EINVAL; 683 break; 684 } 685 return (error); 686 687 #undef IF_INIT 688 } 689 690 int 691 ether_resolvemulti( 692 struct ifnet *ifp, 693 struct sockaddr **llsa, 694 struct sockaddr *sa) 695 { 696 struct sockaddr_dl *sdl; 697 struct sockaddr_in *sin; 698 #ifdef INET6 699 struct sockaddr_in6 *sin6; 700 #endif 701 u_char *e_addr; 702 703 switch(sa->sa_family) { 704 case AF_LINK: 705 /* 706 * No mapping needed. Just check that it's a valid MC address. 707 */ 708 sdl = (struct sockaddr_dl *)sa; 709 e_addr = LLADDR(sdl); 710 if ((e_addr[0] & 1) != 1) 711 return EADDRNOTAVAIL; 712 *llsa = 0; 713 return 0; 714 715 #ifdef INET 716 case AF_INET: 717 sin = (struct sockaddr_in *)sa; 718 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 719 return EADDRNOTAVAIL; 720 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 721 M_WAITOK | M_ZERO); 722 sdl->sdl_len = sizeof *sdl; 723 sdl->sdl_family = AF_LINK; 724 sdl->sdl_index = ifp->if_index; 725 sdl->sdl_type = IFT_ETHER; 726 sdl->sdl_alen = ETHER_ADDR_LEN; 727 e_addr = LLADDR(sdl); 728 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 729 *llsa = (struct sockaddr *)sdl; 730 return 0; 731 #endif 732 #ifdef INET6 733 case AF_INET6: 734 sin6 = (struct sockaddr_in6 *)sa; 735 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 736 /* 737 * An IP6 address of 0 means listen to all 738 * of the Ethernet multicast address used for IP6. 739 * (This is used for multicast routers.) 740 */ 741 ifp->if_flags |= IFF_ALLMULTI; 742 *llsa = 0; 743 return 0; 744 } 745 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 746 return EADDRNOTAVAIL; 747 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 748 M_WAITOK | M_ZERO); 749 sdl->sdl_len = sizeof *sdl; 750 sdl->sdl_family = AF_LINK; 751 sdl->sdl_index = ifp->if_index; 752 sdl->sdl_type = IFT_ETHER; 753 sdl->sdl_alen = ETHER_ADDR_LEN; 754 e_addr = LLADDR(sdl); 755 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 756 *llsa = (struct sockaddr *)sdl; 757 return 0; 758 #endif 759 760 default: 761 /* 762 * Well, the text isn't quite right, but it's the name 763 * that counts... 764 */ 765 return EAFNOSUPPORT; 766 } 767 } 768 769 #if 0 770 /* 771 * This is for reference. We have a table-driven version 772 * of the little-endian crc32 generator, which is faster 773 * than the double-loop. 774 */ 775 uint32_t 776 ether_crc32_le(const uint8_t *buf, size_t len) 777 { 778 uint32_t c, crc, carry; 779 size_t i, j; 780 781 crc = 0xffffffffU; /* initial value */ 782 783 for (i = 0; i < len; i++) { 784 c = buf[i]; 785 for (j = 0; j < 8; j++) { 786 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 787 crc >>= 1; 788 c >>= 1; 789 if (carry) 790 crc = (crc ^ ETHER_CRC_POLY_LE); 791 } 792 } 793 794 return (crc); 795 } 796 #else 797 uint32_t 798 ether_crc32_le(const uint8_t *buf, size_t len) 799 { 800 static const uint32_t crctab[] = { 801 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 802 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 803 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 804 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 805 }; 806 uint32_t crc; 807 size_t i; 808 809 crc = 0xffffffffU; /* initial value */ 810 811 for (i = 0; i < len; i++) { 812 crc ^= buf[i]; 813 crc = (crc >> 4) ^ crctab[crc & 0xf]; 814 crc = (crc >> 4) ^ crctab[crc & 0xf]; 815 } 816 817 return (crc); 818 } 819 #endif 820 821 uint32_t 822 ether_crc32_be(const uint8_t *buf, size_t len) 823 { 824 uint32_t c, crc, carry; 825 size_t i, j; 826 827 crc = 0xffffffffU; /* initial value */ 828 829 for (i = 0; i < len; i++) { 830 c = buf[i]; 831 for (j = 0; j < 8; j++) { 832 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 833 crc <<= 1; 834 c >>= 1; 835 if (carry) 836 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 837 } 838 } 839 840 return (crc); 841 } 842 843 /* 844 * find the size of ethernet header, and call classifier 845 */ 846 void 847 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 848 struct altq_pktattr *pktattr) 849 { 850 struct ether_header *eh; 851 uint16_t ether_type; 852 int hlen, af, hdrsize; 853 caddr_t hdr; 854 855 hlen = sizeof(struct ether_header); 856 eh = mtod(m, struct ether_header *); 857 858 ether_type = ntohs(eh->ether_type); 859 if (ether_type < ETHERMTU) { 860 /* ick! LLC/SNAP */ 861 struct llc *llc = (struct llc *)(eh + 1); 862 hlen += 8; 863 864 if (m->m_len < hlen || 865 llc->llc_dsap != LLC_SNAP_LSAP || 866 llc->llc_ssap != LLC_SNAP_LSAP || 867 llc->llc_control != LLC_UI) 868 goto bad; /* not snap! */ 869 870 ether_type = ntohs(llc->llc_un.type_snap.ether_type); 871 } 872 873 if (ether_type == ETHERTYPE_IP) { 874 af = AF_INET; 875 hdrsize = 20; /* sizeof(struct ip) */ 876 #ifdef INET6 877 } else if (ether_type == ETHERTYPE_IPV6) { 878 af = AF_INET6; 879 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 880 #endif 881 } else 882 goto bad; 883 884 while (m->m_len <= hlen) { 885 hlen -= m->m_len; 886 m = m->m_next; 887 } 888 hdr = m->m_data + hlen; 889 if (m->m_len < hlen + hdrsize) { 890 /* 891 * ip header is not in a single mbuf. this should not 892 * happen in the current code. 893 * (todo: use m_pulldown in the future) 894 */ 895 goto bad; 896 } 897 m->m_data += hlen; 898 m->m_len -= hlen; 899 ifq_classify(ifq, m, af, pktattr); 900 m->m_data -= hlen; 901 m->m_len += hlen; 902 903 return; 904 905 bad: 906 pktattr->pattr_class = NULL; 907 pktattr->pattr_hdr = NULL; 908 pktattr->pattr_af = AF_UNSPEC; 909 } 910 911 static void 912 ether_restore_header(struct mbuf **m0, const struct ether_header *eh, 913 const struct ether_header *save_eh) 914 { 915 struct mbuf *m = *m0; 916 917 ether_restore_hdr++; 918 919 /* 920 * Prepend the header, optimize for the common case of 921 * eh pointing into the mbuf. 922 */ 923 if ((const void *)(eh + 1) == (void *)m->m_data) { 924 m->m_data -= ETHER_HDR_LEN; 925 m->m_len += ETHER_HDR_LEN; 926 m->m_pkthdr.len += ETHER_HDR_LEN; 927 } else { 928 ether_prepend_hdr++; 929 930 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 931 if (m != NULL) { 932 bcopy(save_eh, mtod(m, struct ether_header *), 933 ETHER_HDR_LEN); 934 } 935 } 936 *m0 = m; 937 } 938 939 #ifdef ETHER_INPUT_CHAIN 940 941 static void 942 ether_input_ipifunc(void *arg) 943 { 944 struct mbuf *m, *next; 945 lwkt_port_t port; 946 947 m = arg; 948 do { 949 next = m->m_nextpkt; 950 m->m_nextpkt = NULL; 951 952 port = m->m_pkthdr.header; 953 m->m_pkthdr.header = NULL; 954 955 lwkt_sendmsg(port, 956 &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg); 957 958 m = next; 959 } while (m != NULL); 960 } 961 962 void 963 ether_input_dispatch(struct mbuf_chain *chain) 964 { 965 #ifdef SMP 966 int i; 967 968 for (i = 0; i < ncpus; ++i) { 969 if (chain[i].mc_head != NULL) { 970 lwkt_send_ipiq(globaldata_find(i), 971 ether_input_ipifunc, chain[i].mc_head); 972 } 973 } 974 #else 975 if (chain->mc_head != NULL) 976 ether_input_ipifunc(chain->mc_head); 977 #endif 978 } 979 980 void 981 ether_input_chain_init(struct mbuf_chain *chain) 982 { 983 #ifdef SMP 984 int i; 985 986 for (i = 0; i < ncpus; ++i) 987 chain[i].mc_head = chain[i].mc_tail = NULL; 988 #else 989 chain->mc_head = chain->mc_tail = NULL; 990 #endif 991 } 992 993 #endif /* ETHER_INPUT_CHAIN */ 994 995 /* 996 * Upper layer processing for a received Ethernet packet. 997 */ 998 void 999 ether_demux_oncpu(struct ifnet *ifp, struct mbuf *m) 1000 { 1001 struct ether_header *eh; 1002 int isr, redispatch; 1003 u_short ether_type; 1004 struct ip_fw *rule = NULL; 1005 struct m_tag *mtag; 1006 #ifdef NETATALK 1007 struct llc *l; 1008 #endif 1009 1010 M_ASSERTPKTHDR(m); 1011 KASSERT(m->m_len >= ETHER_HDR_LEN, 1012 ("ether header is no contiguous!\n")); 1013 1014 eh = mtod(m, struct ether_header *); 1015 1016 /* Extract info from dummynet tag */ 1017 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 1018 if (mtag != NULL) { 1019 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 1020 KKASSERT(ifp == NULL); 1021 ifp = m->m_pkthdr.rcvif; 1022 1023 m_tag_delete(m, mtag); 1024 mtag = NULL; 1025 } 1026 if (rule) /* packet is passing the second time */ 1027 goto post_stats; 1028 1029 #ifdef CARP 1030 /* 1031 * XXX: Okay, we need to call carp_forus() and - if it is for 1032 * us jump over code that does the normal check 1033 * "ac_enaddr == ether_dhost". The check sequence is a bit 1034 * different from OpenBSD, so we jump over as few code as 1035 * possible, to catch _all_ sanity checks. This needs 1036 * evaluation, to see if the carp ether_dhost values break any 1037 * of these checks! 1038 */ 1039 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost)) 1040 goto post_stats; 1041 #endif 1042 1043 /* 1044 * Discard packet if upper layers shouldn't see it because 1045 * it was unicast to a different Ethernet address. If the 1046 * driver is working properly, then this situation can only 1047 * happen when the interface is in promiscuous mode. 1048 */ 1049 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) && 1050 (eh->ether_dhost[0] & 1) == 0 && 1051 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) { 1052 m_freem(m); 1053 return; 1054 } 1055 1056 post_stats: 1057 if (IPFW_LOADED && ether_ipfw != 0) { 1058 struct ether_header save_eh = *eh; 1059 1060 /* XXX old crufty stuff, needs to be removed */ 1061 m_adj(m, sizeof(struct ether_header)); 1062 1063 if (!ether_ipfw_chk(&m, NULL, &rule, eh)) { 1064 m_freem(m); 1065 return; 1066 } 1067 1068 ether_restore_header(&m, eh, &save_eh); 1069 if (m == NULL) 1070 return; 1071 eh = mtod(m, struct ether_header *); 1072 } 1073 1074 ether_type = ntohs(eh->ether_type); 1075 KKASSERT(ether_type != ETHERTYPE_VLAN); 1076 1077 if (m->m_flags & M_VLANTAG) { 1078 if (vlan_input2_p != NULL) { 1079 vlan_input2_p(m); 1080 } else { 1081 m->m_pkthdr.rcvif->if_noproto++; 1082 m_freem(m); 1083 } 1084 return; 1085 } 1086 1087 m_adj(m, sizeof(struct ether_header)); 1088 redispatch = 0; 1089 1090 switch (ether_type) { 1091 #ifdef INET 1092 case ETHERTYPE_IP: 1093 if (ipflow_fastforward(m)) 1094 return; 1095 isr = NETISR_IP; 1096 break; 1097 1098 case ETHERTYPE_ARP: 1099 if (ifp->if_flags & IFF_NOARP) { 1100 /* Discard packet if ARP is disabled on interface */ 1101 m_freem(m); 1102 return; 1103 } 1104 isr = NETISR_ARP; 1105 break; 1106 #endif 1107 1108 #ifdef INET6 1109 case ETHERTYPE_IPV6: 1110 isr = NETISR_IPV6; 1111 break; 1112 #endif 1113 1114 #ifdef IPX 1115 case ETHERTYPE_IPX: 1116 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 1117 return; 1118 isr = NETISR_IPX; 1119 break; 1120 #endif 1121 1122 #ifdef NS 1123 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 1124 isr = NETISR_NS; 1125 break; 1126 1127 #endif 1128 1129 #ifdef NETATALK 1130 case ETHERTYPE_AT: 1131 isr = NETISR_ATALK1; 1132 break; 1133 case ETHERTYPE_AARP: 1134 isr = NETISR_AARP; 1135 break; 1136 #endif 1137 1138 #ifdef MPLS 1139 case ETHERTYPE_MPLS: 1140 case ETHERTYPE_MPLS_MCAST: 1141 /* Should have been set by ether_input_chain2(). */ 1142 KKASSERT(m->m_flags & M_MPLSLABELED); 1143 isr = NETISR_MPLS; 1144 break; 1145 #endif 1146 1147 default: 1148 /* 1149 * The accurate msgport is not determined before 1150 * we reach here, so redo the dispatching 1151 */ 1152 redispatch = 1; 1153 #ifdef IPX 1154 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 1155 return; 1156 #endif 1157 #ifdef NS 1158 checksum = mtod(m, ushort *); 1159 /* Novell 802.3 */ 1160 if ((ether_type <= ETHERMTU) && 1161 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) { 1162 if (*checksum == 0xE0E0) { 1163 m->m_pkthdr.len -= 3; 1164 m->m_len -= 3; 1165 m->m_data += 3; 1166 } 1167 isr = NETISR_NS; 1168 break; 1169 } 1170 #endif 1171 #ifdef NETATALK 1172 if (ether_type > ETHERMTU) 1173 goto dropanyway; 1174 l = mtod(m, struct llc *); 1175 if (l->llc_dsap == LLC_SNAP_LSAP && 1176 l->llc_ssap == LLC_SNAP_LSAP && 1177 l->llc_control == LLC_UI) { 1178 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code, 1179 sizeof at_org_code) == 0 && 1180 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 1181 m_adj(m, sizeof(struct llc)); 1182 isr = NETISR_ATALK2; 1183 break; 1184 } 1185 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 1186 sizeof aarp_org_code) == 0 && 1187 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 1188 m_adj(m, sizeof(struct llc)); 1189 isr = NETISR_AARP; 1190 break; 1191 } 1192 } 1193 dropanyway: 1194 #endif 1195 if (ng_ether_input_orphan_p != NULL) 1196 ng_ether_input_orphan_p(ifp, m, eh); 1197 else 1198 m_freem(m); 1199 return; 1200 } 1201 1202 if (!redispatch) 1203 netisr_run(isr, m); 1204 else 1205 netisr_dispatch(isr, m); 1206 } 1207 1208 /* 1209 * First we perform any link layer operations, then continue to the 1210 * upper layers with ether_demux_oncpu(). 1211 */ 1212 void 1213 ether_input_oncpu(struct ifnet *ifp, struct mbuf *m) 1214 { 1215 if ((ifp->if_flags & (IFF_UP | IFF_MONITOR)) != IFF_UP) { 1216 /* 1217 * Receiving interface's flags are changed, when this 1218 * packet is waiting for processing; discard it. 1219 */ 1220 m_freem(m); 1221 return; 1222 } 1223 1224 /* 1225 * Tap the packet off here for a bridge. bridge_input() 1226 * will return NULL if it has consumed the packet, otherwise 1227 * it gets processed as normal. Note that bridge_input() 1228 * will always return the original packet if we need to 1229 * process it locally. 1230 */ 1231 if (ifp->if_bridge) { 1232 KASSERT(bridge_input_p != NULL, 1233 ("%s: if_bridge not loaded!", __func__)); 1234 1235 if(m->m_flags & M_PROTO1) { 1236 m->m_flags &= ~M_PROTO1; 1237 } else { 1238 /* clear M_PROMISC, in case the packets comes from a vlan */ 1239 /* m->m_flags &= ~M_PROMISC; */ 1240 m = bridge_input_p(ifp, m); 1241 if (m == NULL) 1242 return; 1243 1244 KASSERT(ifp == m->m_pkthdr.rcvif, 1245 ("bridge_input_p changed rcvif\n")); 1246 } 1247 } 1248 1249 /* Handle ng_ether(4) processing, if any */ 1250 if (ng_ether_input_p != NULL) { 1251 ng_ether_input_p(ifp, &m); 1252 if (m == NULL) 1253 return; 1254 } 1255 1256 /* Continue with upper layer processing */ 1257 ether_demux_oncpu(ifp, m); 1258 } 1259 1260 static void 1261 ether_input_handler(struct netmsg *nmsg) 1262 { 1263 struct netmsg_packet *nmp = (struct netmsg_packet *)nmsg; 1264 struct ifnet *ifp; 1265 struct mbuf *m; 1266 1267 m = nmp->nm_packet; 1268 M_ASSERTPKTHDR(m); 1269 ifp = m->m_pkthdr.rcvif; 1270 1271 ether_input_oncpu(ifp, m); 1272 } 1273 1274 static __inline void 1275 ether_init_netpacket(int num, struct mbuf *m) 1276 { 1277 struct netmsg_packet *pmsg; 1278 1279 pmsg = &m->m_hdr.mh_netmsg; 1280 netmsg_init(&pmsg->nm_netmsg, &netisr_apanic_rport, 0, 1281 ether_input_handler); 1282 pmsg->nm_packet = m; 1283 pmsg->nm_netmsg.nm_lmsg.u.ms_result = num; 1284 } 1285 1286 static __inline struct lwkt_port * 1287 ether_mport(int num, struct mbuf **m) 1288 { 1289 if (num == NETISR_MAX) { 1290 /* 1291 * All packets whose target msgports can't be 1292 * determined here are dispatched to netisr0, 1293 * where further dispatching may happen. 1294 */ 1295 return cpu_portfn(0); 1296 } 1297 return netisr_find_port(num, m); 1298 } 1299 1300 /* 1301 * Process a received Ethernet packet. 1302 * 1303 * The ethernet header is assumed to be in the mbuf so the caller 1304 * MUST MAKE SURE that there are at least sizeof(struct ether_header) 1305 * bytes in the first mbuf. 1306 * 1307 * We first try to find the target msgport for this ether frame, if 1308 * there is no target msgport for it, this ether frame is discarded, 1309 * else we do following processing according to whether 'chain' is 1310 * NULL or not: 1311 * - If 'chain' is NULL, this ether frame is sent to the target msgport 1312 * immediately. This situation happens when ether_input_chain2 is 1313 * accessed through ifnet.if_input. 1314 * - If 'chain' is not NULL, this ether frame is queued to the 'chain' 1315 * bucket indexed by the target msgport's cpuid and the target msgport 1316 * is saved in mbuf's m_pkthdr.m_head. Caller of ether_input_chain2 1317 * must initialize 'chain' by calling ether_input_chain_init(). 1318 * ether_input_dispatch must be called later to send ether frames 1319 * queued on 'chain' to their target msgport. 1320 */ 1321 void 1322 ether_input_chain2(struct ifnet *ifp, struct mbuf *m, struct mbuf_chain *chain) 1323 { 1324 struct ether_header *eh, *save_eh, save_eh0; 1325 struct lwkt_port *port; 1326 uint16_t ether_type; 1327 int isr; 1328 1329 ASSERT_SERIALIZED(ifp->if_serializer); 1330 M_ASSERTPKTHDR(m); 1331 1332 /* Discard packet if interface is not up */ 1333 if (!(ifp->if_flags & IFF_UP)) { 1334 m_freem(m); 1335 return; 1336 } 1337 1338 if (m->m_len < sizeof(struct ether_header)) { 1339 /* XXX error in the caller. */ 1340 m_freem(m); 1341 return; 1342 } 1343 eh = mtod(m, struct ether_header *); 1344 1345 m->m_pkthdr.rcvif = ifp; 1346 1347 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1348 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost, 1349 ifp->if_addrlen) == 0) 1350 m->m_flags |= M_BCAST; 1351 else 1352 m->m_flags |= M_MCAST; 1353 ifp->if_imcasts++; 1354 } 1355 1356 ETHER_BPF_MTAP(ifp, m); 1357 1358 ifp->if_ibytes += m->m_pkthdr.len; 1359 1360 if (ifp->if_flags & IFF_MONITOR) { 1361 /* 1362 * Interface marked for monitoring; discard packet. 1363 */ 1364 m_freem(m); 1365 return; 1366 } 1367 1368 if (ntohs(eh->ether_type) == ETHERTYPE_VLAN && 1369 (m->m_flags & M_VLANTAG) == 0) { 1370 /* 1371 * Extract vlan tag if hardware does not do it for us 1372 */ 1373 vlan_ether_decap(&m); 1374 if (m == NULL) 1375 return; 1376 eh = mtod(m, struct ether_header *); 1377 } 1378 ether_type = ntohs(eh->ether_type); 1379 1380 if ((m->m_flags & M_VLANTAG) && ether_type == ETHERTYPE_VLAN) { 1381 /* 1382 * To prevent possible dangerous recursion, 1383 * we don't do vlan-in-vlan 1384 */ 1385 ifp->if_noproto++; 1386 m_freem(m); 1387 return; 1388 } 1389 KKASSERT(ether_type != ETHERTYPE_VLAN); 1390 1391 /* 1392 * Map ether type to netisr id. 1393 */ 1394 switch (ether_type) { 1395 #ifdef INET 1396 case ETHERTYPE_IP: 1397 isr = NETISR_IP; 1398 break; 1399 1400 case ETHERTYPE_ARP: 1401 isr = NETISR_ARP; 1402 break; 1403 #endif 1404 1405 #ifdef INET6 1406 case ETHERTYPE_IPV6: 1407 isr = NETISR_IPV6; 1408 break; 1409 #endif 1410 1411 #ifdef IPX 1412 case ETHERTYPE_IPX: 1413 isr = NETISR_IPX; 1414 break; 1415 #endif 1416 1417 #ifdef NS 1418 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 1419 isr = NETISR_NS; 1420 break; 1421 #endif 1422 1423 #ifdef NETATALK 1424 case ETHERTYPE_AT: 1425 isr = NETISR_ATALK1; 1426 break; 1427 case ETHERTYPE_AARP: 1428 isr = NETISR_AARP; 1429 break; 1430 #endif 1431 1432 #ifdef MPLS 1433 case ETHERTYPE_MPLS: 1434 case ETHERTYPE_MPLS_MCAST: 1435 m->m_flags |= M_MPLSLABELED; 1436 isr = NETISR_MPLS; 1437 break; 1438 #endif 1439 1440 default: 1441 /* 1442 * NETISR_MAX is an invalid value; it is chosen to let 1443 * ether_mport() know that we are not able to decide 1444 * this packet's msgport here. 1445 */ 1446 isr = NETISR_MAX; 1447 break; 1448 } 1449 1450 /* 1451 * If the packet is in contiguous memory, following 1452 * m_adj() could ensure that the hidden ether header 1453 * will not be destroyed, else we will have to save 1454 * the ether header for the later restoration. 1455 */ 1456 if (m->m_pkthdr.len != m->m_len) { 1457 save_eh0 = *eh; 1458 save_eh = &save_eh0; 1459 } else { 1460 save_eh = NULL; 1461 } 1462 1463 /* 1464 * Temporarily remove ether header; ether_mport() 1465 * expects a packet without ether header. 1466 */ 1467 m_adj(m, sizeof(struct ether_header)); 1468 1469 /* 1470 * Find the packet's target msgport. 1471 */ 1472 port = ether_mport(isr, &m); 1473 if (port == NULL) { 1474 KKASSERT(m == NULL); 1475 return; 1476 } 1477 1478 /* 1479 * Restore ether header. 1480 */ 1481 if (save_eh != NULL) { 1482 ether_restore_header(&m, eh, save_eh); 1483 if (m == NULL) 1484 return; 1485 } else { 1486 m->m_data -= ETHER_HDR_LEN; 1487 m->m_len += ETHER_HDR_LEN; 1488 m->m_pkthdr.len += ETHER_HDR_LEN; 1489 } 1490 1491 /* 1492 * Initialize mbuf's netmsg packet _after_ possible 1493 * ether header restoration, else the initialized 1494 * netmsg packet may be lost during ether header 1495 * restoration. 1496 */ 1497 ether_init_netpacket(isr, m); 1498 1499 #ifdef ETHER_INPUT_CHAIN 1500 if (chain != NULL) { 1501 struct mbuf_chain *c; 1502 int cpuid; 1503 1504 m->m_pkthdr.header = port; /* XXX */ 1505 cpuid = port->mpu_td->td_gd->gd_cpuid; 1506 1507 c = &chain[cpuid]; 1508 if (c->mc_head == NULL) { 1509 c->mc_head = c->mc_tail = m; 1510 } else { 1511 c->mc_tail->m_nextpkt = m; 1512 c->mc_tail = m; 1513 } 1514 m->m_nextpkt = NULL; 1515 } else 1516 #endif /* ETHER_INPUT_CHAIN */ 1517 lwkt_sendmsg(port, &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg); 1518 } 1519