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 1.85 2008/08/23 08:26:04 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 #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; 412 413 ASSERT_NOT_SERIALIZED(ifp->if_serializer); 414 415 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 416 struct m_tag *mtag; 417 418 /* Extract info from dummynet tag */ 419 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 420 KKASSERT(mtag != NULL); 421 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 422 KKASSERT(rule != NULL); 423 424 m_tag_delete(m, mtag); 425 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 426 } 427 428 if (ifq_is_enabled(&ifp->if_snd)) 429 altq_etherclassify(&ifp->if_snd, m, &pktattr); 430 crit_enter(); 431 if (IPFW_LOADED && ether_ipfw != 0) { 432 struct ether_header save_eh, *eh; 433 434 eh = mtod(m, struct ether_header *); 435 save_eh = *eh; 436 m_adj(m, ETHER_HDR_LEN); 437 if (!ether_ipfw_chk(&m, ifp, &rule, eh)) { 438 crit_exit(); 439 if (m != NULL) { 440 m_freem(m); 441 return ENOBUFS; /* pkt dropped */ 442 } else 443 return 0; /* consumed e.g. in a pipe */ 444 } 445 446 /* packet was ok, restore the ethernet header */ 447 ether_restore_header(&m, eh, &save_eh); 448 if (m == NULL) { 449 crit_exit(); 450 return ENOBUFS; 451 } 452 } 453 crit_exit(); 454 455 /* 456 * Queue message on interface, update output statistics if 457 * successful, and start output if interface not yet active. 458 */ 459 error = ifq_dispatch(ifp, m, &pktattr); 460 return (error); 461 } 462 463 /* 464 * ipfw processing for ethernet packets (in and out). 465 * The second parameter is NULL from ether_demux(), and ifp from 466 * ether_output_frame(). 467 */ 468 static boolean_t 469 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, struct ip_fw **rule, 470 const struct ether_header *eh) 471 { 472 struct ether_header save_eh = *eh; /* might be a ptr in m */ 473 struct ip_fw_args args; 474 struct m_tag *mtag; 475 int i; 476 477 if (*rule != NULL && fw_one_pass) 478 return TRUE; /* dummynet packet, already partially processed */ 479 480 /* 481 * I need some amount of data to be contiguous. 482 */ 483 i = min((*m0)->m_pkthdr.len, max_protohdr); 484 if ((*m0)->m_len < i) { 485 *m0 = m_pullup(*m0, i); 486 if (*m0 == NULL) 487 return FALSE; 488 } 489 490 /* 491 * Clean up tags 492 */ 493 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL) 494 m_tag_delete(*m0, mtag); 495 if ((*m0)->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) { 496 mtag = m_tag_find(*m0, PACKET_TAG_IPFORWARD, NULL); 497 KKASSERT(mtag != NULL); 498 m_tag_delete(*m0, mtag); 499 (*m0)->m_pkthdr.fw_flags &= ~IPFORWARD_MBUF_TAGGED; 500 } 501 502 args.m = *m0; /* the packet we are looking at */ 503 args.oif = dst; /* destination, if any */ 504 args.rule = *rule; /* matching rule to restart */ 505 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 506 i = ip_fw_chk_ptr(&args); 507 *m0 = args.m; 508 *rule = args.rule; 509 510 if ((i & IP_FW_PORT_DENY_FLAG) || *m0 == NULL) /* drop */ 511 return FALSE; 512 513 if (i == 0) /* a PASS rule. */ 514 return TRUE; 515 516 if (i & IP_FW_PORT_DYNT_FLAG) { 517 /* 518 * Pass the pkt to dummynet, which consumes it. 519 */ 520 struct mbuf *m; 521 522 m = *m0; /* pass the original to dummynet */ 523 *m0 = NULL; /* and nothing back to the caller */ 524 525 ether_restore_header(&m, eh, &save_eh); 526 if (m == NULL) 527 return FALSE; 528 529 ip_fw_dn_io_ptr(m, (i & 0xffff), 530 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 531 return FALSE; 532 } 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 } 539 540 static void 541 ether_input(struct ifnet *ifp, struct mbuf *m) 542 { 543 ether_input_chain2(ifp, m, NULL); 544 } 545 546 /* 547 * Perform common duties while attaching to interface list 548 */ 549 void 550 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer) 551 { 552 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header), 553 serializer); 554 } 555 556 void 557 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen, 558 lwkt_serialize_t serializer) 559 { 560 struct sockaddr_dl *sdl; 561 562 ifp->if_type = IFT_ETHER; 563 ifp->if_addrlen = ETHER_ADDR_LEN; 564 ifp->if_hdrlen = ETHER_HDR_LEN; 565 if_attach(ifp, serializer); 566 ifp->if_mtu = ETHERMTU; 567 if (ifp->if_baudrate == 0) 568 ifp->if_baudrate = 10000000; 569 ifp->if_output = ether_output; 570 ifp->if_input = ether_input; 571 ifp->if_resolvemulti = ether_resolvemulti; 572 ifp->if_broadcastaddr = etherbroadcastaddr; 573 sdl = IF_LLSOCKADDR(ifp); 574 sdl->sdl_type = IFT_ETHER; 575 sdl->sdl_alen = ifp->if_addrlen; 576 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 577 /* 578 * XXX Keep the current drivers happy. 579 * XXX Remove once all drivers have been cleaned up 580 */ 581 if (lla != IFP2AC(ifp)->ac_enaddr) 582 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 583 bpfattach(ifp, dlt, hdrlen); 584 if (ng_ether_attach_p != NULL) 585 (*ng_ether_attach_p)(ifp); 586 587 if_printf(ifp, "MAC address: %6D\n", lla, ":"); 588 } 589 590 /* 591 * Perform common duties while detaching an Ethernet interface 592 */ 593 void 594 ether_ifdetach(struct ifnet *ifp) 595 { 596 if_down(ifp); 597 598 if (ng_ether_detach_p != NULL) 599 (*ng_ether_detach_p)(ifp); 600 bpfdetach(ifp); 601 if_detach(ifp); 602 } 603 604 int 605 ether_ioctl(struct ifnet *ifp, int command, caddr_t data) 606 { 607 struct ifaddr *ifa = (struct ifaddr *) data; 608 struct ifreq *ifr = (struct ifreq *) data; 609 int error = 0; 610 611 #define IF_INIT(ifp) \ 612 do { \ 613 if (((ifp)->if_flags & IFF_UP) == 0) { \ 614 (ifp)->if_flags |= IFF_UP; \ 615 (ifp)->if_init((ifp)->if_softc); \ 616 } \ 617 } while (0) 618 619 ASSERT_SERIALIZED(ifp->if_serializer); 620 621 switch (command) { 622 case SIOCSIFADDR: 623 switch (ifa->ifa_addr->sa_family) { 624 #ifdef INET 625 case AF_INET: 626 IF_INIT(ifp); /* before arpwhohas */ 627 arp_ifinit(ifp, ifa); 628 break; 629 #endif 630 #ifdef IPX 631 /* 632 * XXX - This code is probably wrong 633 */ 634 case AF_IPX: 635 { 636 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr; 637 struct arpcom *ac = IFP2AC(ifp); 638 639 if (ipx_nullhost(*ina)) 640 ina->x_host = *(union ipx_host *) ac->ac_enaddr; 641 else 642 bcopy(ina->x_host.c_host, ac->ac_enaddr, 643 sizeof ac->ac_enaddr); 644 645 IF_INIT(ifp); /* Set new address. */ 646 break; 647 } 648 #endif 649 #ifdef NS 650 /* 651 * XXX - This code is probably wrong 652 */ 653 case AF_NS: 654 { 655 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr); 656 struct arpcom *ac = IFP2AC(ifp); 657 658 if (ns_nullhost(*ina)) 659 ina->x_host = *(union ns_host *)(ac->ac_enaddr); 660 else 661 bcopy(ina->x_host.c_host, ac->ac_enaddr, 662 sizeof ac->ac_enaddr); 663 664 /* 665 * Set new address 666 */ 667 IF_INIT(ifp); 668 break; 669 } 670 #endif 671 default: 672 IF_INIT(ifp); 673 break; 674 } 675 break; 676 677 case SIOCGIFADDR: 678 bcopy(IFP2AC(ifp)->ac_enaddr, 679 ((struct sockaddr *)ifr->ifr_data)->sa_data, 680 ETHER_ADDR_LEN); 681 break; 682 683 case SIOCSIFMTU: 684 /* 685 * Set the interface MTU. 686 */ 687 if (ifr->ifr_mtu > ETHERMTU) { 688 error = EINVAL; 689 } else { 690 ifp->if_mtu = ifr->ifr_mtu; 691 } 692 break; 693 default: 694 error = EINVAL; 695 break; 696 } 697 return (error); 698 699 #undef IF_INIT 700 } 701 702 int 703 ether_resolvemulti( 704 struct ifnet *ifp, 705 struct sockaddr **llsa, 706 struct sockaddr *sa) 707 { 708 struct sockaddr_dl *sdl; 709 struct sockaddr_in *sin; 710 #ifdef INET6 711 struct sockaddr_in6 *sin6; 712 #endif 713 u_char *e_addr; 714 715 switch(sa->sa_family) { 716 case AF_LINK: 717 /* 718 * No mapping needed. Just check that it's a valid MC address. 719 */ 720 sdl = (struct sockaddr_dl *)sa; 721 e_addr = LLADDR(sdl); 722 if ((e_addr[0] & 1) != 1) 723 return EADDRNOTAVAIL; 724 *llsa = 0; 725 return 0; 726 727 #ifdef INET 728 case AF_INET: 729 sin = (struct sockaddr_in *)sa; 730 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 731 return EADDRNOTAVAIL; 732 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 733 M_WAITOK | M_ZERO); 734 sdl->sdl_len = sizeof *sdl; 735 sdl->sdl_family = AF_LINK; 736 sdl->sdl_index = ifp->if_index; 737 sdl->sdl_type = IFT_ETHER; 738 sdl->sdl_alen = ETHER_ADDR_LEN; 739 e_addr = LLADDR(sdl); 740 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 741 *llsa = (struct sockaddr *)sdl; 742 return 0; 743 #endif 744 #ifdef INET6 745 case AF_INET6: 746 sin6 = (struct sockaddr_in6 *)sa; 747 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 748 /* 749 * An IP6 address of 0 means listen to all 750 * of the Ethernet multicast address used for IP6. 751 * (This is used for multicast routers.) 752 */ 753 ifp->if_flags |= IFF_ALLMULTI; 754 *llsa = 0; 755 return 0; 756 } 757 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 758 return EADDRNOTAVAIL; 759 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 760 M_WAITOK | M_ZERO); 761 sdl->sdl_len = sizeof *sdl; 762 sdl->sdl_family = AF_LINK; 763 sdl->sdl_index = ifp->if_index; 764 sdl->sdl_type = IFT_ETHER; 765 sdl->sdl_alen = ETHER_ADDR_LEN; 766 e_addr = LLADDR(sdl); 767 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 768 *llsa = (struct sockaddr *)sdl; 769 return 0; 770 #endif 771 772 default: 773 /* 774 * Well, the text isn't quite right, but it's the name 775 * that counts... 776 */ 777 return EAFNOSUPPORT; 778 } 779 } 780 781 #if 0 782 /* 783 * This is for reference. We have a table-driven version 784 * of the little-endian crc32 generator, which is faster 785 * than the double-loop. 786 */ 787 uint32_t 788 ether_crc32_le(const uint8_t *buf, size_t len) 789 { 790 uint32_t c, crc, carry; 791 size_t i, j; 792 793 crc = 0xffffffffU; /* initial value */ 794 795 for (i = 0; i < len; i++) { 796 c = buf[i]; 797 for (j = 0; j < 8; j++) { 798 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 799 crc >>= 1; 800 c >>= 1; 801 if (carry) 802 crc = (crc ^ ETHER_CRC_POLY_LE); 803 } 804 } 805 806 return (crc); 807 } 808 #else 809 uint32_t 810 ether_crc32_le(const uint8_t *buf, size_t len) 811 { 812 static const uint32_t crctab[] = { 813 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 814 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 815 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 816 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 817 }; 818 uint32_t crc; 819 size_t i; 820 821 crc = 0xffffffffU; /* initial value */ 822 823 for (i = 0; i < len; i++) { 824 crc ^= buf[i]; 825 crc = (crc >> 4) ^ crctab[crc & 0xf]; 826 crc = (crc >> 4) ^ crctab[crc & 0xf]; 827 } 828 829 return (crc); 830 } 831 #endif 832 833 uint32_t 834 ether_crc32_be(const uint8_t *buf, size_t len) 835 { 836 uint32_t c, crc, carry; 837 size_t i, j; 838 839 crc = 0xffffffffU; /* initial value */ 840 841 for (i = 0; i < len; i++) { 842 c = buf[i]; 843 for (j = 0; j < 8; j++) { 844 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 845 crc <<= 1; 846 c >>= 1; 847 if (carry) 848 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 849 } 850 } 851 852 return (crc); 853 } 854 855 /* 856 * find the size of ethernet header, and call classifier 857 */ 858 void 859 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 860 struct altq_pktattr *pktattr) 861 { 862 struct ether_header *eh; 863 uint16_t ether_type; 864 int hlen, af, hdrsize; 865 caddr_t hdr; 866 867 hlen = sizeof(struct ether_header); 868 eh = mtod(m, struct ether_header *); 869 870 ether_type = ntohs(eh->ether_type); 871 if (ether_type < ETHERMTU) { 872 /* ick! LLC/SNAP */ 873 struct llc *llc = (struct llc *)(eh + 1); 874 hlen += 8; 875 876 if (m->m_len < hlen || 877 llc->llc_dsap != LLC_SNAP_LSAP || 878 llc->llc_ssap != LLC_SNAP_LSAP || 879 llc->llc_control != LLC_UI) 880 goto bad; /* not snap! */ 881 882 ether_type = ntohs(llc->llc_un.type_snap.ether_type); 883 } 884 885 if (ether_type == ETHERTYPE_IP) { 886 af = AF_INET; 887 hdrsize = 20; /* sizeof(struct ip) */ 888 #ifdef INET6 889 } else if (ether_type == ETHERTYPE_IPV6) { 890 af = AF_INET6; 891 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 892 #endif 893 } else 894 goto bad; 895 896 while (m->m_len <= hlen) { 897 hlen -= m->m_len; 898 m = m->m_next; 899 } 900 hdr = m->m_data + hlen; 901 if (m->m_len < hlen + hdrsize) { 902 /* 903 * ip header is not in a single mbuf. this should not 904 * happen in the current code. 905 * (todo: use m_pulldown in the future) 906 */ 907 goto bad; 908 } 909 m->m_data += hlen; 910 m->m_len -= hlen; 911 ifq_classify(ifq, m, af, pktattr); 912 m->m_data -= hlen; 913 m->m_len += hlen; 914 915 return; 916 917 bad: 918 pktattr->pattr_class = NULL; 919 pktattr->pattr_hdr = NULL; 920 pktattr->pattr_af = AF_UNSPEC; 921 } 922 923 static void 924 ether_restore_header(struct mbuf **m0, const struct ether_header *eh, 925 const struct ether_header *save_eh) 926 { 927 struct mbuf *m = *m0; 928 929 ether_restore_hdr++; 930 931 /* 932 * Prepend the header, optimize for the common case of 933 * eh pointing into the mbuf. 934 */ 935 if ((const void *)(eh + 1) == (void *)m->m_data) { 936 m->m_data -= ETHER_HDR_LEN; 937 m->m_len += ETHER_HDR_LEN; 938 m->m_pkthdr.len += ETHER_HDR_LEN; 939 } else { 940 ether_prepend_hdr++; 941 942 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 943 if (m != NULL) { 944 bcopy(save_eh, mtod(m, struct ether_header *), 945 ETHER_HDR_LEN); 946 } 947 } 948 *m0 = m; 949 } 950 951 #ifdef ETHER_INPUT_CHAIN 952 953 static void 954 ether_input_ipifunc(void *arg) 955 { 956 struct mbuf *m, *next; 957 lwkt_port_t port; 958 959 m = arg; 960 do { 961 next = m->m_nextpkt; 962 m->m_nextpkt = NULL; 963 964 port = m->m_pkthdr.header; 965 m->m_pkthdr.header = NULL; 966 967 lwkt_sendmsg(port, 968 &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg); 969 970 m = next; 971 } while (m != NULL); 972 } 973 974 void 975 ether_input_dispatch(struct mbuf_chain *chain) 976 { 977 #ifdef SMP 978 int i; 979 980 for (i = 0; i < ncpus; ++i) { 981 if (chain[i].mc_head != NULL) { 982 lwkt_send_ipiq(globaldata_find(i), 983 ether_input_ipifunc, chain[i].mc_head); 984 } 985 } 986 #else 987 if (chain->mc_head != NULL) 988 ether_input_ipifunc(chain->mc_head); 989 #endif 990 } 991 992 void 993 ether_input_chain_init(struct mbuf_chain *chain) 994 { 995 #ifdef SMP 996 int i; 997 998 for (i = 0; i < ncpus; ++i) 999 chain[i].mc_head = chain[i].mc_tail = NULL; 1000 #else 1001 chain->mc_head = chain->mc_tail = NULL; 1002 #endif 1003 } 1004 1005 #endif /* ETHER_INPUT_CHAIN */ 1006 1007 /* 1008 * Upper layer processing for a received Ethernet packet. 1009 */ 1010 void 1011 ether_demux_oncpu(struct ifnet *ifp, struct mbuf *m) 1012 { 1013 struct ether_header *eh; 1014 int isr, redispatch; 1015 u_short ether_type; 1016 struct ip_fw *rule = NULL; 1017 #ifdef NETATALK 1018 struct llc *l; 1019 #endif 1020 1021 M_ASSERTPKTHDR(m); 1022 KASSERT(m->m_len >= ETHER_HDR_LEN, 1023 ("ether header is no contiguous!\n")); 1024 1025 eh = mtod(m, struct ether_header *); 1026 1027 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 1028 struct m_tag *mtag; 1029 1030 /* Extract info from dummynet tag */ 1031 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 1032 KKASSERT(mtag != NULL); 1033 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 1034 KKASSERT(rule != NULL); 1035 1036 m_tag_delete(m, mtag); 1037 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 1038 1039 /* packet is passing the second time */ 1040 goto post_stats; 1041 } 1042 1043 #ifdef CARP 1044 /* 1045 * XXX: Okay, we need to call carp_forus() and - if it is for 1046 * us jump over code that does the normal check 1047 * "ac_enaddr == ether_dhost". The check sequence is a bit 1048 * different from OpenBSD, so we jump over as few code as 1049 * possible, to catch _all_ sanity checks. This needs 1050 * evaluation, to see if the carp ether_dhost values break any 1051 * of these checks! 1052 */ 1053 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost)) 1054 goto post_stats; 1055 #endif 1056 1057 /* 1058 * Discard packet if upper layers shouldn't see it because 1059 * it was unicast to a different Ethernet address. If the 1060 * driver is working properly, then this situation can only 1061 * happen when the interface is in promiscuous mode. 1062 */ 1063 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) && 1064 (eh->ether_dhost[0] & 1) == 0 && 1065 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) { 1066 m_freem(m); 1067 return; 1068 } 1069 1070 post_stats: 1071 if (IPFW_LOADED && ether_ipfw != 0) { 1072 struct ether_header save_eh = *eh; 1073 1074 /* XXX old crufty stuff, needs to be removed */ 1075 m_adj(m, sizeof(struct ether_header)); 1076 1077 if (!ether_ipfw_chk(&m, NULL, &rule, eh)) { 1078 m_freem(m); 1079 return; 1080 } 1081 1082 ether_restore_header(&m, eh, &save_eh); 1083 if (m == NULL) 1084 return; 1085 eh = mtod(m, struct ether_header *); 1086 } 1087 1088 ether_type = ntohs(eh->ether_type); 1089 KKASSERT(ether_type != ETHERTYPE_VLAN); 1090 1091 if (m->m_flags & M_VLANTAG) { 1092 if (vlan_input2_p != NULL) { 1093 vlan_input2_p(m); 1094 } else { 1095 m->m_pkthdr.rcvif->if_noproto++; 1096 m_freem(m); 1097 } 1098 return; 1099 } 1100 1101 m_adj(m, sizeof(struct ether_header)); 1102 redispatch = 0; 1103 1104 switch (ether_type) { 1105 #ifdef INET 1106 case ETHERTYPE_IP: 1107 if (ipflow_fastforward(m)) 1108 return; 1109 isr = NETISR_IP; 1110 break; 1111 1112 case ETHERTYPE_ARP: 1113 if (ifp->if_flags & IFF_NOARP) { 1114 /* Discard packet if ARP is disabled on interface */ 1115 m_freem(m); 1116 return; 1117 } 1118 isr = NETISR_ARP; 1119 break; 1120 #endif 1121 1122 #ifdef INET6 1123 case ETHERTYPE_IPV6: 1124 isr = NETISR_IPV6; 1125 break; 1126 #endif 1127 1128 #ifdef IPX 1129 case ETHERTYPE_IPX: 1130 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 1131 return; 1132 isr = NETISR_IPX; 1133 break; 1134 #endif 1135 1136 #ifdef NS 1137 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 1138 isr = NETISR_NS; 1139 break; 1140 1141 #endif 1142 1143 #ifdef NETATALK 1144 case ETHERTYPE_AT: 1145 isr = NETISR_ATALK1; 1146 break; 1147 case ETHERTYPE_AARP: 1148 isr = NETISR_AARP; 1149 break; 1150 #endif 1151 1152 #ifdef MPLS 1153 case ETHERTYPE_MPLS: 1154 case ETHERTYPE_MPLS_MCAST: 1155 /* Should have been set by ether_input_chain2(). */ 1156 KKASSERT(m->m_flags & M_MPLSLABELED); 1157 isr = NETISR_MPLS; 1158 break; 1159 #endif 1160 1161 default: 1162 /* 1163 * The accurate msgport is not determined before 1164 * we reach here, so redo the dispatching 1165 */ 1166 redispatch = 1; 1167 #ifdef IPX 1168 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) 1169 return; 1170 #endif 1171 #ifdef NS 1172 checksum = mtod(m, ushort *); 1173 /* Novell 802.3 */ 1174 if ((ether_type <= ETHERMTU) && 1175 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) { 1176 if (*checksum == 0xE0E0) { 1177 m->m_pkthdr.len -= 3; 1178 m->m_len -= 3; 1179 m->m_data += 3; 1180 } 1181 isr = NETISR_NS; 1182 break; 1183 } 1184 #endif 1185 #ifdef NETATALK 1186 if (ether_type > ETHERMTU) 1187 goto dropanyway; 1188 l = mtod(m, struct llc *); 1189 if (l->llc_dsap == LLC_SNAP_LSAP && 1190 l->llc_ssap == LLC_SNAP_LSAP && 1191 l->llc_control == LLC_UI) { 1192 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code, 1193 sizeof at_org_code) == 0 && 1194 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 1195 m_adj(m, sizeof(struct llc)); 1196 isr = NETISR_ATALK2; 1197 break; 1198 } 1199 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 1200 sizeof aarp_org_code) == 0 && 1201 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 1202 m_adj(m, sizeof(struct llc)); 1203 isr = NETISR_AARP; 1204 break; 1205 } 1206 } 1207 dropanyway: 1208 #endif 1209 if (ng_ether_input_orphan_p != NULL) 1210 ng_ether_input_orphan_p(ifp, m, eh); 1211 else 1212 m_freem(m); 1213 return; 1214 } 1215 1216 if (!redispatch) 1217 netisr_run(isr, m); 1218 else 1219 netisr_dispatch(isr, m); 1220 } 1221 1222 /* 1223 * First we perform any link layer operations, then continue to the 1224 * upper layers with ether_demux_oncpu(). 1225 */ 1226 void 1227 ether_input_oncpu(struct ifnet *ifp, struct mbuf *m) 1228 { 1229 if ((ifp->if_flags & (IFF_UP | IFF_MONITOR)) != IFF_UP) { 1230 /* 1231 * Receiving interface's flags are changed, when this 1232 * packet is waiting for processing; discard it. 1233 */ 1234 m_freem(m); 1235 return; 1236 } 1237 1238 /* 1239 * Tap the packet off here for a bridge. bridge_input() 1240 * will return NULL if it has consumed the packet, otherwise 1241 * it gets processed as normal. Note that bridge_input() 1242 * will always return the original packet if we need to 1243 * process it locally. 1244 */ 1245 if (ifp->if_bridge) { 1246 KASSERT(bridge_input_p != NULL, 1247 ("%s: if_bridge not loaded!", __func__)); 1248 1249 if(m->m_flags & M_PROTO1) { 1250 m->m_flags &= ~M_PROTO1; 1251 } else { 1252 /* clear M_PROMISC, in case the packets comes from a vlan */ 1253 /* m->m_flags &= ~M_PROMISC; */ 1254 m = bridge_input_p(ifp, m); 1255 if (m == NULL) 1256 return; 1257 1258 KASSERT(ifp == m->m_pkthdr.rcvif, 1259 ("bridge_input_p changed rcvif\n")); 1260 } 1261 } 1262 1263 /* Handle ng_ether(4) processing, if any */ 1264 if (ng_ether_input_p != NULL) { 1265 ng_ether_input_p(ifp, &m); 1266 if (m == NULL) 1267 return; 1268 } 1269 1270 /* Continue with upper layer processing */ 1271 ether_demux_oncpu(ifp, m); 1272 } 1273 1274 static void 1275 ether_input_handler(struct netmsg *nmsg) 1276 { 1277 struct netmsg_packet *nmp = (struct netmsg_packet *)nmsg; 1278 struct ifnet *ifp; 1279 struct mbuf *m; 1280 1281 m = nmp->nm_packet; 1282 M_ASSERTPKTHDR(m); 1283 ifp = m->m_pkthdr.rcvif; 1284 1285 ether_input_oncpu(ifp, m); 1286 } 1287 1288 static __inline void 1289 ether_init_netpacket(int num, struct mbuf *m) 1290 { 1291 struct netmsg_packet *pmsg; 1292 1293 pmsg = &m->m_hdr.mh_netmsg; 1294 netmsg_init(&pmsg->nm_netmsg, &netisr_apanic_rport, 0, 1295 ether_input_handler); 1296 pmsg->nm_packet = m; 1297 pmsg->nm_netmsg.nm_lmsg.u.ms_result = num; 1298 } 1299 1300 static __inline struct lwkt_port * 1301 ether_mport(int num, struct mbuf **m) 1302 { 1303 if (num == NETISR_MAX) { 1304 /* 1305 * All packets whose target msgports can't be 1306 * determined here are dispatched to netisr0, 1307 * where further dispatching may happen. 1308 */ 1309 return cpu_portfn(0); 1310 } 1311 return netisr_find_port(num, m); 1312 } 1313 1314 /* 1315 * Process a received Ethernet packet. 1316 * 1317 * The ethernet header is assumed to be in the mbuf so the caller 1318 * MUST MAKE SURE that there are at least sizeof(struct ether_header) 1319 * bytes in the first mbuf. 1320 * 1321 * We first try to find the target msgport for this ether frame, if 1322 * there is no target msgport for it, this ether frame is discarded, 1323 * else we do following processing according to whether 'chain' is 1324 * NULL or not: 1325 * - If 'chain' is NULL, this ether frame is sent to the target msgport 1326 * immediately. This situation happens when ether_input_chain2 is 1327 * accessed through ifnet.if_input. 1328 * - If 'chain' is not NULL, this ether frame is queued to the 'chain' 1329 * bucket indexed by the target msgport's cpuid and the target msgport 1330 * is saved in mbuf's m_pkthdr.m_head. Caller of ether_input_chain2 1331 * must initialize 'chain' by calling ether_input_chain_init(). 1332 * ether_input_dispatch must be called later to send ether frames 1333 * queued on 'chain' to their target msgport. 1334 */ 1335 void 1336 ether_input_chain2(struct ifnet *ifp, struct mbuf *m, struct mbuf_chain *chain) 1337 { 1338 struct ether_header *eh, *save_eh, save_eh0; 1339 struct lwkt_port *port; 1340 uint16_t ether_type; 1341 int isr; 1342 1343 ASSERT_SERIALIZED(ifp->if_serializer); 1344 M_ASSERTPKTHDR(m); 1345 1346 /* Discard packet if interface is not up */ 1347 if (!(ifp->if_flags & IFF_UP)) { 1348 m_freem(m); 1349 return; 1350 } 1351 1352 if (m->m_len < sizeof(struct ether_header)) { 1353 /* XXX error in the caller. */ 1354 m_freem(m); 1355 return; 1356 } 1357 eh = mtod(m, struct ether_header *); 1358 1359 m->m_pkthdr.rcvif = ifp; 1360 1361 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1362 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost, 1363 ifp->if_addrlen) == 0) 1364 m->m_flags |= M_BCAST; 1365 else 1366 m->m_flags |= M_MCAST; 1367 ifp->if_imcasts++; 1368 } 1369 1370 ETHER_BPF_MTAP(ifp, m); 1371 1372 ifp->if_ibytes += m->m_pkthdr.len; 1373 1374 if (ifp->if_flags & IFF_MONITOR) { 1375 /* 1376 * Interface marked for monitoring; discard packet. 1377 */ 1378 m_freem(m); 1379 return; 1380 } 1381 1382 if (ntohs(eh->ether_type) == ETHERTYPE_VLAN && 1383 (m->m_flags & M_VLANTAG) == 0) { 1384 /* 1385 * Extract vlan tag if hardware does not do it for us 1386 */ 1387 vlan_ether_decap(&m); 1388 if (m == NULL) 1389 return; 1390 eh = mtod(m, struct ether_header *); 1391 } 1392 ether_type = ntohs(eh->ether_type); 1393 1394 if ((m->m_flags & M_VLANTAG) && ether_type == ETHERTYPE_VLAN) { 1395 /* 1396 * To prevent possible dangerous recursion, 1397 * we don't do vlan-in-vlan 1398 */ 1399 ifp->if_noproto++; 1400 m_freem(m); 1401 return; 1402 } 1403 KKASSERT(ether_type != ETHERTYPE_VLAN); 1404 1405 /* 1406 * Map ether type to netisr id. 1407 */ 1408 switch (ether_type) { 1409 #ifdef INET 1410 case ETHERTYPE_IP: 1411 isr = NETISR_IP; 1412 break; 1413 1414 case ETHERTYPE_ARP: 1415 isr = NETISR_ARP; 1416 break; 1417 #endif 1418 1419 #ifdef INET6 1420 case ETHERTYPE_IPV6: 1421 isr = NETISR_IPV6; 1422 break; 1423 #endif 1424 1425 #ifdef IPX 1426 case ETHERTYPE_IPX: 1427 isr = NETISR_IPX; 1428 break; 1429 #endif 1430 1431 #ifdef NS 1432 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 1433 isr = NETISR_NS; 1434 break; 1435 #endif 1436 1437 #ifdef NETATALK 1438 case ETHERTYPE_AT: 1439 isr = NETISR_ATALK1; 1440 break; 1441 case ETHERTYPE_AARP: 1442 isr = NETISR_AARP; 1443 break; 1444 #endif 1445 1446 #ifdef MPLS 1447 case ETHERTYPE_MPLS: 1448 case ETHERTYPE_MPLS_MCAST: 1449 m->m_flags |= M_MPLSLABELED; 1450 isr = NETISR_MPLS; 1451 break; 1452 #endif 1453 1454 default: 1455 /* 1456 * NETISR_MAX is an invalid value; it is chosen to let 1457 * ether_mport() know that we are not able to decide 1458 * this packet's msgport here. 1459 */ 1460 isr = NETISR_MAX; 1461 break; 1462 } 1463 1464 /* 1465 * If the packet is in contiguous memory, following 1466 * m_adj() could ensure that the hidden ether header 1467 * will not be destroyed, else we will have to save 1468 * the ether header for the later restoration. 1469 */ 1470 if (m->m_pkthdr.len != m->m_len) { 1471 save_eh0 = *eh; 1472 save_eh = &save_eh0; 1473 } else { 1474 save_eh = NULL; 1475 } 1476 1477 /* 1478 * Temporarily remove ether header; ether_mport() 1479 * expects a packet without ether header. 1480 */ 1481 m_adj(m, sizeof(struct ether_header)); 1482 1483 /* 1484 * Find the packet's target msgport. 1485 */ 1486 port = ether_mport(isr, &m); 1487 if (port == NULL) { 1488 KKASSERT(m == NULL); 1489 return; 1490 } 1491 1492 /* 1493 * Restore ether header. 1494 */ 1495 if (save_eh != NULL) { 1496 ether_restore_header(&m, eh, save_eh); 1497 if (m == NULL) 1498 return; 1499 } else { 1500 m->m_data -= ETHER_HDR_LEN; 1501 m->m_len += ETHER_HDR_LEN; 1502 m->m_pkthdr.len += ETHER_HDR_LEN; 1503 } 1504 1505 /* 1506 * Initialize mbuf's netmsg packet _after_ possible 1507 * ether header restoration, else the initialized 1508 * netmsg packet may be lost during ether header 1509 * restoration. 1510 */ 1511 ether_init_netpacket(isr, m); 1512 1513 #ifdef ETHER_INPUT_CHAIN 1514 if (chain != NULL) { 1515 struct mbuf_chain *c; 1516 int cpuid; 1517 1518 m->m_pkthdr.header = port; /* XXX */ 1519 cpuid = port->mpu_td->td_gd->gd_cpuid; 1520 1521 c = &chain[cpuid]; 1522 if (c->mc_head == NULL) { 1523 c->mc_head = c->mc_tail = m; 1524 } else { 1525 c->mc_tail->m_nextpkt = m; 1526 c->mc_tail = m; 1527 } 1528 m->m_nextpkt = NULL; 1529 } else 1530 #endif /* ETHER_INPUT_CHAIN */ 1531 lwkt_sendmsg(port, &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg); 1532 } 1533