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 1.96 2008/11/22 04:00:53 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/lock.h> 52 #include <sys/malloc.h> 53 #include <sys/mbuf.h> 54 #include <sys/msgport.h> 55 #include <sys/socket.h> 56 #include <sys/sockio.h> 57 #include <sys/sysctl.h> 58 #include <sys/thread.h> 59 #include <sys/thread2.h> 60 61 #include <net/if.h> 62 #include <net/netisr.h> 63 #include <net/route.h> 64 #include <net/if_llc.h> 65 #include <net/if_dl.h> 66 #include <net/if_types.h> 67 #include <net/ifq_var.h> 68 #include <net/bpf.h> 69 #include <net/ethernet.h> 70 #include <net/vlan/if_vlan_ether.h> 71 #include <net/netmsg2.h> 72 73 #if defined(INET) || defined(INET6) 74 #include <netinet/in.h> 75 #include <netinet/in_var.h> 76 #include <netinet/if_ether.h> 77 #include <netinet/ip_flow.h> 78 #include <net/ipfw/ip_fw.h> 79 #include <net/dummynet/ip_dummynet.h> 80 #endif 81 #ifdef INET6 82 #include <netinet6/nd6.h> 83 #endif 84 85 #ifdef CARP 86 #include <netinet/ip_carp.h> 87 #endif 88 89 #ifdef IPX 90 #include <netproto/ipx/ipx.h> 91 #include <netproto/ipx/ipx_if.h> 92 int (*ef_inputp)(struct ifnet*, const struct ether_header *eh, struct mbuf *m); 93 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, 94 short *tp, int *hlen); 95 #endif 96 97 #ifdef NS 98 #include <netns/ns.h> 99 #include <netns/ns_if.h> 100 ushort ns_nettype; 101 int ether_outputdebug = 0; 102 int ether_inputdebug = 0; 103 #endif 104 105 #ifdef NETATALK 106 #include <netproto/atalk/at.h> 107 #include <netproto/atalk/at_var.h> 108 #include <netproto/atalk/at_extern.h> 109 110 #define llc_snap_org_code llc_un.type_snap.org_code 111 #define llc_snap_ether_type llc_un.type_snap.ether_type 112 113 extern u_char at_org_code[3]; 114 extern u_char aarp_org_code[3]; 115 #endif /* NETATALK */ 116 117 #ifdef MPLS 118 #include <netproto/mpls/mpls.h> 119 #endif 120 121 /* netgraph node hooks for ng_ether(4) */ 122 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 123 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, 124 struct mbuf *m, const struct ether_header *eh); 125 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 126 void (*ng_ether_attach_p)(struct ifnet *ifp); 127 void (*ng_ether_detach_p)(struct ifnet *ifp); 128 129 void (*vlan_input_p)(struct mbuf *); 130 131 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *, 132 struct rtentry *); 133 static void ether_restore_header(struct mbuf **, const struct ether_header *, 134 const struct ether_header *); 135 136 /* 137 * if_bridge support 138 */ 139 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *); 140 int (*bridge_output_p)(struct ifnet *, struct mbuf *); 141 void (*bridge_dn_p)(struct mbuf *, struct ifnet *); 142 143 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 144 struct sockaddr *); 145 146 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = { 147 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 148 }; 149 150 #define gotoerr(e) do { error = (e); goto bad; } while (0) 151 #define IFP2AC(ifp) ((struct arpcom *)(ifp)) 152 153 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 154 struct ip_fw **rule, 155 const struct ether_header *eh); 156 157 static int ether_ipfw; 158 static u_int ether_restore_hdr; 159 static u_int ether_prepend_hdr; 160 161 SYSCTL_DECL(_net_link); 162 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 163 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 164 ðer_ipfw, 0, "Pass ether pkts through firewall"); 165 SYSCTL_UINT(_net_link_ether, OID_AUTO, restore_hdr, CTLFLAG_RW, 166 ðer_restore_hdr, 0, "# of ether header restoration"); 167 SYSCTL_UINT(_net_link_ether, OID_AUTO, prepend_hdr, CTLFLAG_RW, 168 ðer_prepend_hdr, 0, 169 "# of ether header restoration which prepends mbuf"); 170 171 #define ETHER_KTR_STR "ifp=%p" 172 #define ETHER_KTR_ARG_SIZE (sizeof(void *)) 173 #ifndef KTR_ETHERNET 174 #define KTR_ETHERNET KTR_ALL 175 #endif 176 KTR_INFO_MASTER(ether); 177 KTR_INFO(KTR_ETHERNET, ether, chain_beg, 0, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE); 178 KTR_INFO(KTR_ETHERNET, ether, chain_end, 1, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE); 179 KTR_INFO(KTR_ETHERNET, ether, disp_beg, 2, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE); 180 KTR_INFO(KTR_ETHERNET, ether, disp_end, 3, ETHER_KTR_STR, ETHER_KTR_ARG_SIZE); 181 #define logether(name, arg) KTR_LOG(ether_ ## name, arg) 182 183 /* 184 * Ethernet output routine. 185 * Encapsulate a packet of type family for the local net. 186 * Use trailer local net encapsulation if enough data in first 187 * packet leaves a multiple of 512 bytes of data in remainder. 188 * Assumes that ifp is actually pointer to arpcom structure. 189 */ 190 static int 191 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 192 struct rtentry *rt) 193 { 194 struct ether_header *eh, *deh; 195 u_char *edst; 196 int loop_copy = 0; 197 int hlen = ETHER_HDR_LEN; /* link layer header length */ 198 struct arpcom *ac = IFP2AC(ifp); 199 int error; 200 201 ASSERT_NOT_SERIALIZED(ifp->if_serializer); 202 203 if (ifp->if_flags & IFF_MONITOR) 204 gotoerr(ENETDOWN); 205 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 206 gotoerr(ENETDOWN); 207 208 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT); 209 if (m == NULL) 210 return (ENOBUFS); 211 eh = mtod(m, struct ether_header *); 212 edst = eh->ether_dhost; 213 214 /* 215 * Fill in the destination ethernet address and frame type. 216 */ 217 switch (dst->sa_family) { 218 #ifdef INET 219 case AF_INET: 220 if (!arpresolve(ifp, rt, m, dst, edst)) 221 return (0); /* if not yet resolved */ 222 #ifdef MPLS 223 if (m->m_flags & M_MPLSLABELED) 224 eh->ether_type = htons(ETHERTYPE_MPLS); 225 else 226 #endif 227 eh->ether_type = htons(ETHERTYPE_IP); 228 break; 229 #endif 230 #ifdef INET6 231 case AF_INET6: 232 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst)) 233 return (0); /* Something bad happenned. */ 234 eh->ether_type = htons(ETHERTYPE_IPV6); 235 break; 236 #endif 237 #ifdef IPX 238 case AF_IPX: 239 if (ef_outputp != NULL) { 240 /* 241 * Hold BGL and recheck ef_outputp 242 */ 243 get_mplock(); 244 if (ef_outputp != NULL) { 245 error = ef_outputp(ifp, &m, dst, 246 &eh->ether_type, &hlen); 247 rel_mplock(); 248 if (error) 249 goto bad; 250 else 251 break; 252 } 253 rel_mplock(); 254 } 255 eh->ether_type = htons(ETHERTYPE_IPX); 256 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 257 edst, ETHER_ADDR_LEN); 258 break; 259 #endif 260 #ifdef NETATALK 261 case AF_APPLETALK: { 262 struct at_ifaddr *aa; 263 264 /* 265 * Hold BGL 266 */ 267 get_mplock(); 268 269 if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { 270 error = 0; /* XXX */ 271 rel_mplock(); 272 goto bad; 273 } 274 /* 275 * In the phase 2 case, need to prepend an mbuf for 276 * the llc header. Since we must preserve the value 277 * of m, which is passed to us by value, we m_copy() 278 * the first mbuf, and use it for our llc header. 279 */ 280 if (aa->aa_flags & AFA_PHASE2) { 281 struct llc llc; 282 283 M_PREPEND(m, sizeof(struct llc), MB_DONTWAIT); 284 eh = mtod(m, struct ether_header *); 285 edst = eh->ether_dhost; 286 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 287 llc.llc_control = LLC_UI; 288 bcopy(at_org_code, llc.llc_snap_org_code, 289 sizeof at_org_code); 290 llc.llc_snap_ether_type = htons(ETHERTYPE_AT); 291 bcopy(&llc, 292 mtod(m, caddr_t) + sizeof(struct ether_header), 293 sizeof(struct llc)); 294 eh->ether_type = htons(m->m_pkthdr.len); 295 hlen = sizeof(struct llc) + ETHER_HDR_LEN; 296 } else { 297 eh->ether_type = htons(ETHERTYPE_AT); 298 } 299 if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) { 300 rel_mplock(); 301 return (0); 302 } 303 304 rel_mplock(); 305 break; 306 } 307 #endif 308 #ifdef NS 309 case AF_NS: 310 switch(ns_nettype) { 311 default: 312 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 313 eh->ether_type = 0x8137; 314 break; 315 case 0x0: /* Novell 802.3 */ 316 eh->ether_type = htons(m->m_pkthdr.len); 317 break; 318 case 0xe0e0: /* Novell 802.2 and Token-Ring */ 319 M_PREPEND(m, 3, MB_DONTWAIT); 320 eh = mtod(m, struct ether_header *); 321 edst = eh->ether_dhost; 322 eh->ether_type = htons(m->m_pkthdr.len); 323 cp = mtod(m, u_char *) + sizeof(struct ether_header); 324 *cp++ = 0xE0; 325 *cp++ = 0xE0; 326 *cp++ = 0x03; 327 break; 328 } 329 bcopy(&(((struct sockaddr_ns *)dst)->sns_addr.x_host), edst, 330 ETHER_ADDR_LEN); 331 /* 332 * XXX if ns_thishost is the same as the node's ethernet 333 * address then just the default code will catch this anyhow. 334 * So I'm not sure if this next clause should be here at all? 335 * [JRE] 336 */ 337 if (bcmp(edst, &ns_thishost, ETHER_ADDR_LEN) == 0) { 338 m->m_pkthdr.rcvif = ifp; 339 netisr_dispatch(NETISR_NS, m); 340 return (error); 341 } 342 if (bcmp(edst, &ns_broadhost, ETHER_ADDR_LEN) == 0) 343 m->m_flags |= M_BCAST; 344 break; 345 #endif 346 case pseudo_AF_HDRCMPLT: 347 case AF_UNSPEC: 348 loop_copy = -1; /* if this is for us, don't do it */ 349 deh = (struct ether_header *)dst->sa_data; 350 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN); 351 eh->ether_type = deh->ether_type; 352 break; 353 354 default: 355 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 356 gotoerr(EAFNOSUPPORT); 357 } 358 359 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */ 360 memcpy(eh->ether_shost, 361 ((struct ether_header *)dst->sa_data)->ether_shost, 362 ETHER_ADDR_LEN); 363 else 364 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN); 365 366 /* 367 * Bridges require special output handling. 368 */ 369 if (ifp->if_bridge) { 370 KASSERT(bridge_output_p != NULL, 371 ("%s: if_bridge not loaded!", __func__)); 372 return bridge_output_p(ifp, m); 373 } 374 375 /* 376 * If a simplex interface, and the packet is being sent to our 377 * Ethernet address or a broadcast address, loopback a copy. 378 * XXX To make a simplex device behave exactly like a duplex 379 * device, we should copy in the case of sending to our own 380 * ethernet address (thus letting the original actually appear 381 * on the wire). However, we don't do that here for security 382 * reasons and compatibility with the original behavior. 383 */ 384 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 385 int csum_flags = 0; 386 387 if (m->m_pkthdr.csum_flags & CSUM_IP) 388 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 389 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 390 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 391 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 392 struct mbuf *n; 393 394 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) { 395 n->m_pkthdr.csum_flags |= csum_flags; 396 if (csum_flags & CSUM_DATA_VALID) 397 n->m_pkthdr.csum_data = 0xffff; 398 if_simloop(ifp, n, dst->sa_family, hlen); 399 } else 400 ifp->if_iqdrops++; 401 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 402 ETHER_ADDR_LEN) == 0) { 403 m->m_pkthdr.csum_flags |= csum_flags; 404 if (csum_flags & CSUM_DATA_VALID) 405 m->m_pkthdr.csum_data = 0xffff; 406 if_simloop(ifp, m, dst->sa_family, hlen); 407 return (0); /* XXX */ 408 } 409 } 410 411 #ifdef CARP 412 if (ifp->if_carp) { 413 /* 414 * Hold BGL and recheck ifp->if_carp 415 */ 416 get_mplock(); 417 if (ifp->if_carp && (error = carp_output(ifp, m, dst, NULL))) { 418 rel_mplock(); 419 goto bad; 420 } 421 rel_mplock(); 422 } 423 #endif 424 425 426 /* Handle ng_ether(4) processing, if any */ 427 if (ng_ether_output_p != NULL) { 428 /* 429 * Hold BGL and recheck ng_ether_output_p 430 */ 431 get_mplock(); 432 if (ng_ether_output_p != NULL) { 433 if ((error = ng_ether_output_p(ifp, &m)) != 0) { 434 rel_mplock(); 435 goto bad; 436 } 437 if (m == NULL) { 438 rel_mplock(); 439 return (0); 440 } 441 } 442 rel_mplock(); 443 } 444 445 /* Continue with link-layer output */ 446 return ether_output_frame(ifp, m); 447 448 bad: 449 m_freem(m); 450 return (error); 451 } 452 453 /* 454 * Ethernet link layer output routine to send a raw frame to the device. 455 * 456 * This assumes that the 14 byte Ethernet header is present and contiguous 457 * in the first mbuf. 458 */ 459 int 460 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 461 { 462 struct ip_fw *rule = NULL; 463 int error = 0; 464 struct altq_pktattr pktattr; 465 466 ASSERT_NOT_SERIALIZED(ifp->if_serializer); 467 468 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 469 struct m_tag *mtag; 470 471 /* Extract info from dummynet tag */ 472 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 473 KKASSERT(mtag != NULL); 474 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 475 KKASSERT(rule != NULL); 476 477 m_tag_delete(m, mtag); 478 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 479 } 480 481 if (ifq_is_enabled(&ifp->if_snd)) 482 altq_etherclassify(&ifp->if_snd, m, &pktattr); 483 crit_enter(); 484 if (IPFW_LOADED && ether_ipfw != 0) { 485 struct ether_header save_eh, *eh; 486 487 eh = mtod(m, struct ether_header *); 488 save_eh = *eh; 489 m_adj(m, ETHER_HDR_LEN); 490 if (!ether_ipfw_chk(&m, ifp, &rule, eh)) { 491 crit_exit(); 492 if (m != NULL) { 493 m_freem(m); 494 return ENOBUFS; /* pkt dropped */ 495 } else 496 return 0; /* consumed e.g. in a pipe */ 497 } 498 499 /* packet was ok, restore the ethernet header */ 500 ether_restore_header(&m, eh, &save_eh); 501 if (m == NULL) { 502 crit_exit(); 503 return ENOBUFS; 504 } 505 } 506 crit_exit(); 507 508 /* 509 * Queue message on interface, update output statistics if 510 * successful, and start output if interface not yet active. 511 */ 512 error = ifq_dispatch(ifp, m, &pktattr); 513 return (error); 514 } 515 516 /* 517 * ipfw processing for ethernet packets (in and out). 518 * The second parameter is NULL from ether_demux(), and ifp from 519 * ether_output_frame(). 520 */ 521 static boolean_t 522 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, struct ip_fw **rule, 523 const struct ether_header *eh) 524 { 525 struct ether_header save_eh = *eh; /* might be a ptr in *m0 */ 526 struct ip_fw_args args; 527 struct m_tag *mtag; 528 struct mbuf *m; 529 int i; 530 531 if (*rule != NULL && fw_one_pass) 532 return TRUE; /* dummynet packet, already partially processed */ 533 534 /* 535 * I need some amount of data to be contiguous. 536 */ 537 i = min((*m0)->m_pkthdr.len, max_protohdr); 538 if ((*m0)->m_len < i) { 539 *m0 = m_pullup(*m0, i); 540 if (*m0 == NULL) 541 return FALSE; 542 } 543 544 /* 545 * Clean up tags 546 */ 547 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL) 548 m_tag_delete(*m0, mtag); 549 if ((*m0)->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) { 550 mtag = m_tag_find(*m0, PACKET_TAG_IPFORWARD, NULL); 551 KKASSERT(mtag != NULL); 552 m_tag_delete(*m0, mtag); 553 (*m0)->m_pkthdr.fw_flags &= ~IPFORWARD_MBUF_TAGGED; 554 } 555 556 args.m = *m0; /* the packet we are looking at */ 557 args.oif = dst; /* destination, if any */ 558 args.rule = *rule; /* matching rule to restart */ 559 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 560 i = ip_fw_chk_ptr(&args); 561 *m0 = args.m; 562 *rule = args.rule; 563 564 if (*m0 == NULL) 565 return FALSE; 566 567 switch (i) { 568 case IP_FW_PASS: 569 return TRUE; 570 571 case IP_FW_DIVERT: 572 case IP_FW_TEE: 573 case IP_FW_DENY: 574 /* 575 * XXX at some point add support for divert/forward actions. 576 * If none of the above matches, we have to drop the pkt. 577 */ 578 return FALSE; 579 580 case IP_FW_DUMMYNET: 581 /* 582 * Pass the pkt to dummynet, which consumes it. 583 */ 584 m = *m0; /* pass the original to dummynet */ 585 *m0 = NULL; /* and nothing back to the caller */ 586 587 ether_restore_header(&m, eh, &save_eh); 588 if (m == NULL) 589 return FALSE; 590 591 ip_fw_dn_io_ptr(m, args.cookie, 592 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 593 ip_dn_queue(m); 594 return FALSE; 595 596 default: 597 panic("unknown ipfw return value: %d\n", i); 598 } 599 } 600 601 static void 602 ether_input(struct ifnet *ifp, struct mbuf *m) 603 { 604 ether_input_chain(ifp, m, NULL); 605 } 606 607 /* 608 * Perform common duties while attaching to interface list 609 */ 610 void 611 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer) 612 { 613 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header), 614 serializer); 615 } 616 617 void 618 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen, 619 lwkt_serialize_t serializer) 620 { 621 struct sockaddr_dl *sdl; 622 623 ifp->if_type = IFT_ETHER; 624 ifp->if_addrlen = ETHER_ADDR_LEN; 625 ifp->if_hdrlen = ETHER_HDR_LEN; 626 if_attach(ifp, serializer); 627 ifp->if_mtu = ETHERMTU; 628 if (ifp->if_baudrate == 0) 629 ifp->if_baudrate = 10000000; 630 ifp->if_output = ether_output; 631 ifp->if_input = ether_input; 632 ifp->if_resolvemulti = ether_resolvemulti; 633 ifp->if_broadcastaddr = etherbroadcastaddr; 634 sdl = IF_LLSOCKADDR(ifp); 635 sdl->sdl_type = IFT_ETHER; 636 sdl->sdl_alen = ifp->if_addrlen; 637 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 638 /* 639 * XXX Keep the current drivers happy. 640 * XXX Remove once all drivers have been cleaned up 641 */ 642 if (lla != IFP2AC(ifp)->ac_enaddr) 643 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 644 bpfattach(ifp, dlt, hdrlen); 645 if (ng_ether_attach_p != NULL) 646 (*ng_ether_attach_p)(ifp); 647 648 if_printf(ifp, "MAC address: %6D\n", lla, ":"); 649 } 650 651 /* 652 * Perform common duties while detaching an Ethernet interface 653 */ 654 void 655 ether_ifdetach(struct ifnet *ifp) 656 { 657 if_down(ifp); 658 659 if (ng_ether_detach_p != NULL) 660 (*ng_ether_detach_p)(ifp); 661 bpfdetach(ifp); 662 if_detach(ifp); 663 } 664 665 int 666 ether_ioctl(struct ifnet *ifp, int command, caddr_t data) 667 { 668 struct ifaddr *ifa = (struct ifaddr *) data; 669 struct ifreq *ifr = (struct ifreq *) data; 670 int error = 0; 671 672 #define IF_INIT(ifp) \ 673 do { \ 674 if (((ifp)->if_flags & IFF_UP) == 0) { \ 675 (ifp)->if_flags |= IFF_UP; \ 676 (ifp)->if_init((ifp)->if_softc); \ 677 } \ 678 } while (0) 679 680 ASSERT_SERIALIZED(ifp->if_serializer); 681 682 switch (command) { 683 case SIOCSIFADDR: 684 switch (ifa->ifa_addr->sa_family) { 685 #ifdef INET 686 case AF_INET: 687 IF_INIT(ifp); /* before arpwhohas */ 688 arp_ifinit(ifp, ifa); 689 break; 690 #endif 691 #ifdef IPX 692 /* 693 * XXX - This code is probably wrong 694 */ 695 case AF_IPX: 696 { 697 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr; 698 struct arpcom *ac = IFP2AC(ifp); 699 700 if (ipx_nullhost(*ina)) 701 ina->x_host = *(union ipx_host *) ac->ac_enaddr; 702 else 703 bcopy(ina->x_host.c_host, ac->ac_enaddr, 704 sizeof ac->ac_enaddr); 705 706 IF_INIT(ifp); /* Set new address. */ 707 break; 708 } 709 #endif 710 #ifdef NS 711 /* 712 * XXX - This code is probably wrong 713 */ 714 case AF_NS: 715 { 716 struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr); 717 struct arpcom *ac = IFP2AC(ifp); 718 719 if (ns_nullhost(*ina)) 720 ina->x_host = *(union ns_host *)(ac->ac_enaddr); 721 else 722 bcopy(ina->x_host.c_host, ac->ac_enaddr, 723 sizeof ac->ac_enaddr); 724 725 /* 726 * Set new address 727 */ 728 IF_INIT(ifp); 729 break; 730 } 731 #endif 732 default: 733 IF_INIT(ifp); 734 break; 735 } 736 break; 737 738 case SIOCGIFADDR: 739 bcopy(IFP2AC(ifp)->ac_enaddr, 740 ((struct sockaddr *)ifr->ifr_data)->sa_data, 741 ETHER_ADDR_LEN); 742 break; 743 744 case SIOCSIFMTU: 745 /* 746 * Set the interface MTU. 747 */ 748 if (ifr->ifr_mtu > ETHERMTU) { 749 error = EINVAL; 750 } else { 751 ifp->if_mtu = ifr->ifr_mtu; 752 } 753 break; 754 default: 755 error = EINVAL; 756 break; 757 } 758 return (error); 759 760 #undef IF_INIT 761 } 762 763 int 764 ether_resolvemulti( 765 struct ifnet *ifp, 766 struct sockaddr **llsa, 767 struct sockaddr *sa) 768 { 769 struct sockaddr_dl *sdl; 770 struct sockaddr_in *sin; 771 #ifdef INET6 772 struct sockaddr_in6 *sin6; 773 #endif 774 u_char *e_addr; 775 776 switch(sa->sa_family) { 777 case AF_LINK: 778 /* 779 * No mapping needed. Just check that it's a valid MC address. 780 */ 781 sdl = (struct sockaddr_dl *)sa; 782 e_addr = LLADDR(sdl); 783 if ((e_addr[0] & 1) != 1) 784 return EADDRNOTAVAIL; 785 *llsa = 0; 786 return 0; 787 788 #ifdef INET 789 case AF_INET: 790 sin = (struct sockaddr_in *)sa; 791 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 792 return EADDRNOTAVAIL; 793 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 794 M_WAITOK | M_ZERO); 795 sdl->sdl_len = sizeof *sdl; 796 sdl->sdl_family = AF_LINK; 797 sdl->sdl_index = ifp->if_index; 798 sdl->sdl_type = IFT_ETHER; 799 sdl->sdl_alen = ETHER_ADDR_LEN; 800 e_addr = LLADDR(sdl); 801 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 802 *llsa = (struct sockaddr *)sdl; 803 return 0; 804 #endif 805 #ifdef INET6 806 case AF_INET6: 807 sin6 = (struct sockaddr_in6 *)sa; 808 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 809 /* 810 * An IP6 address of 0 means listen to all 811 * of the Ethernet multicast address used for IP6. 812 * (This is used for multicast routers.) 813 */ 814 ifp->if_flags |= IFF_ALLMULTI; 815 *llsa = 0; 816 return 0; 817 } 818 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 819 return EADDRNOTAVAIL; 820 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, 821 M_WAITOK | M_ZERO); 822 sdl->sdl_len = sizeof *sdl; 823 sdl->sdl_family = AF_LINK; 824 sdl->sdl_index = ifp->if_index; 825 sdl->sdl_type = IFT_ETHER; 826 sdl->sdl_alen = ETHER_ADDR_LEN; 827 e_addr = LLADDR(sdl); 828 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 829 *llsa = (struct sockaddr *)sdl; 830 return 0; 831 #endif 832 833 default: 834 /* 835 * Well, the text isn't quite right, but it's the name 836 * that counts... 837 */ 838 return EAFNOSUPPORT; 839 } 840 } 841 842 #if 0 843 /* 844 * This is for reference. We have a table-driven version 845 * of the little-endian crc32 generator, which is faster 846 * than the double-loop. 847 */ 848 uint32_t 849 ether_crc32_le(const uint8_t *buf, size_t len) 850 { 851 uint32_t c, crc, carry; 852 size_t i, j; 853 854 crc = 0xffffffffU; /* initial value */ 855 856 for (i = 0; i < len; i++) { 857 c = buf[i]; 858 for (j = 0; j < 8; j++) { 859 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 860 crc >>= 1; 861 c >>= 1; 862 if (carry) 863 crc = (crc ^ ETHER_CRC_POLY_LE); 864 } 865 } 866 867 return (crc); 868 } 869 #else 870 uint32_t 871 ether_crc32_le(const uint8_t *buf, size_t len) 872 { 873 static const uint32_t crctab[] = { 874 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 875 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 876 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 877 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 878 }; 879 uint32_t crc; 880 size_t i; 881 882 crc = 0xffffffffU; /* initial value */ 883 884 for (i = 0; i < len; i++) { 885 crc ^= buf[i]; 886 crc = (crc >> 4) ^ crctab[crc & 0xf]; 887 crc = (crc >> 4) ^ crctab[crc & 0xf]; 888 } 889 890 return (crc); 891 } 892 #endif 893 894 uint32_t 895 ether_crc32_be(const uint8_t *buf, size_t len) 896 { 897 uint32_t c, crc, carry; 898 size_t i, j; 899 900 crc = 0xffffffffU; /* initial value */ 901 902 for (i = 0; i < len; i++) { 903 c = buf[i]; 904 for (j = 0; j < 8; j++) { 905 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 906 crc <<= 1; 907 c >>= 1; 908 if (carry) 909 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 910 } 911 } 912 913 return (crc); 914 } 915 916 /* 917 * find the size of ethernet header, and call classifier 918 */ 919 void 920 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 921 struct altq_pktattr *pktattr) 922 { 923 struct ether_header *eh; 924 uint16_t ether_type; 925 int hlen, af, hdrsize; 926 caddr_t hdr; 927 928 hlen = sizeof(struct ether_header); 929 eh = mtod(m, struct ether_header *); 930 931 ether_type = ntohs(eh->ether_type); 932 if (ether_type < ETHERMTU) { 933 /* ick! LLC/SNAP */ 934 struct llc *llc = (struct llc *)(eh + 1); 935 hlen += 8; 936 937 if (m->m_len < hlen || 938 llc->llc_dsap != LLC_SNAP_LSAP || 939 llc->llc_ssap != LLC_SNAP_LSAP || 940 llc->llc_control != LLC_UI) 941 goto bad; /* not snap! */ 942 943 ether_type = ntohs(llc->llc_un.type_snap.ether_type); 944 } 945 946 if (ether_type == ETHERTYPE_IP) { 947 af = AF_INET; 948 hdrsize = 20; /* sizeof(struct ip) */ 949 #ifdef INET6 950 } else if (ether_type == ETHERTYPE_IPV6) { 951 af = AF_INET6; 952 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 953 #endif 954 } else 955 goto bad; 956 957 while (m->m_len <= hlen) { 958 hlen -= m->m_len; 959 m = m->m_next; 960 } 961 hdr = m->m_data + hlen; 962 if (m->m_len < hlen + hdrsize) { 963 /* 964 * ip header is not in a single mbuf. this should not 965 * happen in the current code. 966 * (todo: use m_pulldown in the future) 967 */ 968 goto bad; 969 } 970 m->m_data += hlen; 971 m->m_len -= hlen; 972 ifq_classify(ifq, m, af, pktattr); 973 m->m_data -= hlen; 974 m->m_len += hlen; 975 976 return; 977 978 bad: 979 pktattr->pattr_class = NULL; 980 pktattr->pattr_hdr = NULL; 981 pktattr->pattr_af = AF_UNSPEC; 982 } 983 984 static void 985 ether_restore_header(struct mbuf **m0, const struct ether_header *eh, 986 const struct ether_header *save_eh) 987 { 988 struct mbuf *m = *m0; 989 990 ether_restore_hdr++; 991 992 /* 993 * Prepend the header, optimize for the common case of 994 * eh pointing into the mbuf. 995 */ 996 if ((const void *)(eh + 1) == (void *)m->m_data) { 997 m->m_data -= ETHER_HDR_LEN; 998 m->m_len += ETHER_HDR_LEN; 999 m->m_pkthdr.len += ETHER_HDR_LEN; 1000 } else { 1001 ether_prepend_hdr++; 1002 1003 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 1004 if (m != NULL) { 1005 bcopy(save_eh, mtod(m, struct ether_header *), 1006 ETHER_HDR_LEN); 1007 } 1008 } 1009 *m0 = m; 1010 } 1011 1012 static void 1013 ether_input_ipifunc(void *arg) 1014 { 1015 struct mbuf *m, *next; 1016 lwkt_port_t port; 1017 1018 m = arg; 1019 do { 1020 next = m->m_nextpkt; 1021 m->m_nextpkt = NULL; 1022 1023 port = m->m_pkthdr.header; 1024 m->m_pkthdr.header = NULL; 1025 1026 lwkt_sendmsg(port, 1027 &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg); 1028 1029 m = next; 1030 } while (m != NULL); 1031 } 1032 1033 void 1034 ether_input_dispatch(struct mbuf_chain *chain) 1035 { 1036 #ifdef SMP 1037 int i; 1038 1039 logether(disp_beg, NULL); 1040 for (i = 0; i < ncpus; ++i) { 1041 if (chain[i].mc_head != NULL) { 1042 lwkt_send_ipiq(globaldata_find(i), 1043 ether_input_ipifunc, chain[i].mc_head); 1044 } 1045 } 1046 #else 1047 logether(disp_beg, NULL); 1048 if (chain->mc_head != NULL) 1049 ether_input_ipifunc(chain->mc_head); 1050 #endif 1051 logether(disp_end, NULL); 1052 } 1053 1054 void 1055 ether_input_chain_init(struct mbuf_chain *chain) 1056 { 1057 #ifdef SMP 1058 int i; 1059 1060 for (i = 0; i < ncpus; ++i) 1061 chain[i].mc_head = chain[i].mc_tail = NULL; 1062 #else 1063 chain->mc_head = chain->mc_tail = NULL; 1064 #endif 1065 } 1066 1067 /* 1068 * Upper layer processing for a received Ethernet packet. 1069 */ 1070 void 1071 ether_demux_oncpu(struct ifnet *ifp, struct mbuf *m) 1072 { 1073 struct ether_header *eh; 1074 int isr, redispatch; 1075 u_short ether_type; 1076 struct ip_fw *rule = NULL; 1077 #ifdef NETATALK 1078 struct llc *l; 1079 #endif 1080 1081 M_ASSERTPKTHDR(m); 1082 KASSERT(m->m_len >= ETHER_HDR_LEN, 1083 ("ether header is no contiguous!\n")); 1084 1085 eh = mtod(m, struct ether_header *); 1086 1087 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 1088 struct m_tag *mtag; 1089 1090 /* Extract info from dummynet tag */ 1091 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 1092 KKASSERT(mtag != NULL); 1093 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 1094 KKASSERT(rule != NULL); 1095 1096 m_tag_delete(m, mtag); 1097 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 1098 1099 /* packet is passing the second time */ 1100 goto post_stats; 1101 } 1102 1103 #ifdef CARP 1104 /* 1105 * XXX: Okay, we need to call carp_forus() and - if it is for 1106 * us jump over code that does the normal check 1107 * "ac_enaddr == ether_dhost". The check sequence is a bit 1108 * different from OpenBSD, so we jump over as few code as 1109 * possible, to catch _all_ sanity checks. This needs 1110 * evaluation, to see if the carp ether_dhost values break any 1111 * of these checks! 1112 */ 1113 if (ifp->if_carp) { 1114 /* 1115 * Hold BGL and recheck ifp->if_carp 1116 */ 1117 get_mplock(); 1118 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost)) { 1119 rel_mplock(); 1120 goto post_stats; 1121 } 1122 rel_mplock(); 1123 } 1124 #endif 1125 1126 /* 1127 * Discard packet if upper layers shouldn't see it because 1128 * it was unicast to a different Ethernet address. If the 1129 * driver is working properly, then this situation can only 1130 * happen when the interface is in promiscuous mode. 1131 */ 1132 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) && 1133 (eh->ether_dhost[0] & 1) == 0 && 1134 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) { 1135 m_freem(m); 1136 return; 1137 } 1138 1139 post_stats: 1140 if (IPFW_LOADED && ether_ipfw != 0) { 1141 struct ether_header save_eh = *eh; 1142 1143 /* XXX old crufty stuff, needs to be removed */ 1144 m_adj(m, sizeof(struct ether_header)); 1145 1146 if (!ether_ipfw_chk(&m, NULL, &rule, eh)) { 1147 m_freem(m); 1148 return; 1149 } 1150 1151 ether_restore_header(&m, eh, &save_eh); 1152 if (m == NULL) 1153 return; 1154 eh = mtod(m, struct ether_header *); 1155 } 1156 1157 ether_type = ntohs(eh->ether_type); 1158 KKASSERT(ether_type != ETHERTYPE_VLAN); 1159 1160 if (m->m_flags & M_VLANTAG) { 1161 void (*vlan_input_func)(struct mbuf *); 1162 1163 vlan_input_func = vlan_input_p; 1164 if (vlan_input_func != NULL) { 1165 vlan_input_func(m); 1166 } else { 1167 m->m_pkthdr.rcvif->if_noproto++; 1168 m_freem(m); 1169 } 1170 return; 1171 } 1172 1173 m_adj(m, sizeof(struct ether_header)); 1174 redispatch = 0; 1175 1176 switch (ether_type) { 1177 #ifdef INET 1178 case ETHERTYPE_IP: 1179 if (ipflow_fastforward(m)) 1180 return; 1181 isr = NETISR_IP; 1182 break; 1183 1184 case ETHERTYPE_ARP: 1185 if (ifp->if_flags & IFF_NOARP) { 1186 /* Discard packet if ARP is disabled on interface */ 1187 m_freem(m); 1188 return; 1189 } 1190 isr = NETISR_ARP; 1191 break; 1192 #endif 1193 1194 #ifdef INET6 1195 case ETHERTYPE_IPV6: 1196 isr = NETISR_IPV6; 1197 break; 1198 #endif 1199 1200 #ifdef IPX 1201 case ETHERTYPE_IPX: 1202 if (ef_inputp) { 1203 /* 1204 * Hold BGL and recheck ef_inputp 1205 */ 1206 get_mplock(); 1207 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) { 1208 rel_mplock(); 1209 return; 1210 } 1211 rel_mplock(); 1212 } 1213 isr = NETISR_IPX; 1214 break; 1215 #endif 1216 1217 #ifdef NS 1218 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 1219 isr = NETISR_NS; 1220 break; 1221 1222 #endif 1223 1224 #ifdef NETATALK 1225 case ETHERTYPE_AT: 1226 isr = NETISR_ATALK1; 1227 break; 1228 case ETHERTYPE_AARP: 1229 isr = NETISR_AARP; 1230 break; 1231 #endif 1232 1233 #ifdef MPLS 1234 case ETHERTYPE_MPLS: 1235 case ETHERTYPE_MPLS_MCAST: 1236 /* Should have been set by ether_input_chain(). */ 1237 KKASSERT(m->m_flags & M_MPLSLABELED); 1238 isr = NETISR_MPLS; 1239 break; 1240 #endif 1241 1242 default: 1243 /* 1244 * The accurate msgport is not determined before 1245 * we reach here, so redo the dispatching 1246 */ 1247 redispatch = 1; 1248 #ifdef IPX 1249 if (ef_inputp) { 1250 /* 1251 * Hold BGL and recheck ef_inputp 1252 */ 1253 get_mplock(); 1254 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) { 1255 rel_mplock(); 1256 return; 1257 } 1258 rel_mplock(); 1259 } 1260 #endif 1261 #ifdef NS 1262 checksum = mtod(m, ushort *); 1263 /* Novell 802.3 */ 1264 if ((ether_type <= ETHERMTU) && 1265 ((*checksum == 0xffff) || (*checksum == 0xE0E0))) { 1266 if (*checksum == 0xE0E0) { 1267 m->m_pkthdr.len -= 3; 1268 m->m_len -= 3; 1269 m->m_data += 3; 1270 } 1271 isr = NETISR_NS; 1272 break; 1273 } 1274 #endif 1275 #ifdef NETATALK 1276 if (ether_type > ETHERMTU) 1277 goto dropanyway; 1278 l = mtod(m, struct llc *); 1279 if (l->llc_dsap == LLC_SNAP_LSAP && 1280 l->llc_ssap == LLC_SNAP_LSAP && 1281 l->llc_control == LLC_UI) { 1282 if (bcmp(&(l->llc_snap_org_code)[0], at_org_code, 1283 sizeof at_org_code) == 0 && 1284 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { 1285 m_adj(m, sizeof(struct llc)); 1286 isr = NETISR_ATALK2; 1287 break; 1288 } 1289 if (bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, 1290 sizeof aarp_org_code) == 0 && 1291 ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { 1292 m_adj(m, sizeof(struct llc)); 1293 isr = NETISR_AARP; 1294 break; 1295 } 1296 } 1297 dropanyway: 1298 #endif 1299 if (ng_ether_input_orphan_p != NULL) { 1300 /* 1301 * Hold BGL and recheck ng_ether_input_orphan_p 1302 */ 1303 get_mplock(); 1304 if (ng_ether_input_orphan_p != NULL) { 1305 ng_ether_input_orphan_p(ifp, m, eh); 1306 rel_mplock(); 1307 return; 1308 } 1309 rel_mplock(); 1310 } 1311 m_freem(m); 1312 return; 1313 } 1314 1315 if (!redispatch) 1316 netisr_run(isr, m); 1317 else 1318 netisr_dispatch(isr, m); 1319 } 1320 1321 /* 1322 * First we perform any link layer operations, then continue to the 1323 * upper layers with ether_demux_oncpu(). 1324 */ 1325 void 1326 ether_input_oncpu(struct ifnet *ifp, struct mbuf *m) 1327 { 1328 if ((ifp->if_flags & (IFF_UP | IFF_MONITOR)) != IFF_UP) { 1329 /* 1330 * Receiving interface's flags are changed, when this 1331 * packet is waiting for processing; discard it. 1332 */ 1333 m_freem(m); 1334 return; 1335 } 1336 1337 /* 1338 * Tap the packet off here for a bridge. bridge_input() 1339 * will return NULL if it has consumed the packet, otherwise 1340 * it gets processed as normal. Note that bridge_input() 1341 * will always return the original packet if we need to 1342 * process it locally. 1343 */ 1344 if (ifp->if_bridge) { 1345 KASSERT(bridge_input_p != NULL, 1346 ("%s: if_bridge not loaded!", __func__)); 1347 1348 if(m->m_flags & M_PROTO1) { 1349 m->m_flags &= ~M_PROTO1; 1350 } else { 1351 /* clear M_PROMISC, in case the packets comes from a vlan */ 1352 /* m->m_flags &= ~M_PROMISC; */ 1353 m = bridge_input_p(ifp, m); 1354 if (m == NULL) 1355 return; 1356 1357 KASSERT(ifp == m->m_pkthdr.rcvif, 1358 ("bridge_input_p changed rcvif\n")); 1359 } 1360 } 1361 1362 /* Handle ng_ether(4) processing, if any */ 1363 if (ng_ether_input_p != NULL) { 1364 /* 1365 * Hold BGL and recheck ng_ether_input_p 1366 */ 1367 get_mplock(); 1368 if (ng_ether_input_p != NULL) 1369 ng_ether_input_p(ifp, &m); 1370 rel_mplock(); 1371 1372 if (m == NULL) 1373 return; 1374 } 1375 1376 /* Continue with upper layer processing */ 1377 ether_demux_oncpu(ifp, m); 1378 } 1379 1380 /* 1381 * Perform certain functions of ether_input_chain(): 1382 * - Test IFF_UP 1383 * - Update statistics 1384 * - Run bpf(4) tap if requested 1385 * Then pass the packet to ether_input_oncpu(). 1386 * 1387 * This function should be used by pseudo interface (e.g. vlan(4)), 1388 * when it tries to claim that the packet is received by it. 1389 */ 1390 void 1391 ether_reinput_oncpu(struct ifnet *ifp, struct mbuf *m, int run_bpf) 1392 { 1393 /* Discard packet if interface is not up */ 1394 if (!(ifp->if_flags & IFF_UP)) { 1395 m_freem(m); 1396 return; 1397 } 1398 1399 /* Change receiving interface */ 1400 m->m_pkthdr.rcvif = ifp; 1401 1402 /* Update statistics */ 1403 ifp->if_ipackets++; 1404 ifp->if_ibytes += m->m_pkthdr.len; 1405 if (m->m_flags & (M_MCAST | M_BCAST)) 1406 ifp->if_imcasts++; 1407 1408 if (run_bpf) 1409 BPF_MTAP(ifp, m); 1410 1411 ether_input_oncpu(ifp, m); 1412 } 1413 1414 static void 1415 ether_input_handler(struct netmsg *nmsg) 1416 { 1417 struct netmsg_packet *nmp = (struct netmsg_packet *)nmsg; 1418 struct ifnet *ifp; 1419 struct mbuf *m; 1420 1421 m = nmp->nm_packet; 1422 M_ASSERTPKTHDR(m); 1423 ifp = m->m_pkthdr.rcvif; 1424 1425 ether_input_oncpu(ifp, m); 1426 } 1427 1428 static __inline void 1429 ether_init_netpacket(int num, struct mbuf *m) 1430 { 1431 struct netmsg_packet *pmsg; 1432 1433 pmsg = &m->m_hdr.mh_netmsg; 1434 netmsg_init(&pmsg->nm_netmsg, &netisr_apanic_rport, MSGF_MPSAFE, 1435 ether_input_handler); 1436 pmsg->nm_packet = m; 1437 pmsg->nm_netmsg.nm_lmsg.u.ms_result = num; 1438 } 1439 1440 static __inline struct lwkt_port * 1441 ether_mport(int num, struct mbuf **m) 1442 { 1443 if (num == NETISR_MAX) { 1444 /* 1445 * All packets whose target msgports can't be 1446 * determined here are dispatched to netisr0, 1447 * where further dispatching may happen. 1448 */ 1449 return cpu_portfn(0); 1450 } 1451 return netisr_find_port(num, m); 1452 } 1453 1454 /* 1455 * Process a received Ethernet packet. 1456 * 1457 * The ethernet header is assumed to be in the mbuf so the caller 1458 * MUST MAKE SURE that there are at least sizeof(struct ether_header) 1459 * bytes in the first mbuf. 1460 * 1461 * We first try to find the target msgport for this ether frame, if 1462 * there is no target msgport for it, this ether frame is discarded, 1463 * else we do following processing according to whether 'chain' is 1464 * NULL or not: 1465 * - If 'chain' is NULL, this ether frame is sent to the target msgport 1466 * immediately. This situation happens when ether_input_chain is 1467 * accessed through ifnet.if_input. 1468 * - If 'chain' is not NULL, this ether frame is queued to the 'chain' 1469 * bucket indexed by the target msgport's cpuid and the target msgport 1470 * is saved in mbuf's m_pkthdr.m_head. Caller of ether_input_chain 1471 * must initialize 'chain' by calling ether_input_chain_init(). 1472 * ether_input_dispatch must be called later to send ether frames 1473 * queued on 'chain' to their target msgport. 1474 */ 1475 void 1476 ether_input_chain(struct ifnet *ifp, struct mbuf *m, struct mbuf_chain *chain) 1477 { 1478 struct ether_header *eh, *save_eh, save_eh0; 1479 struct lwkt_port *port; 1480 uint16_t ether_type; 1481 int isr; 1482 1483 ASSERT_SERIALIZED(ifp->if_serializer); 1484 M_ASSERTPKTHDR(m); 1485 1486 /* Discard packet if interface is not up */ 1487 if (!(ifp->if_flags & IFF_UP)) { 1488 m_freem(m); 1489 return; 1490 } 1491 1492 if (m->m_len < sizeof(struct ether_header)) { 1493 /* XXX error in the caller. */ 1494 m_freem(m); 1495 return; 1496 } 1497 eh = mtod(m, struct ether_header *); 1498 1499 m->m_pkthdr.rcvif = ifp; 1500 1501 logether(chain_beg, ifp); 1502 1503 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1504 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost, 1505 ifp->if_addrlen) == 0) 1506 m->m_flags |= M_BCAST; 1507 else 1508 m->m_flags |= M_MCAST; 1509 ifp->if_imcasts++; 1510 } 1511 1512 ETHER_BPF_MTAP(ifp, m); 1513 1514 ifp->if_ibytes += m->m_pkthdr.len; 1515 1516 if (ifp->if_flags & IFF_MONITOR) { 1517 /* 1518 * Interface marked for monitoring; discard packet. 1519 */ 1520 m_freem(m); 1521 1522 logether(chain_end, ifp); 1523 return; 1524 } 1525 1526 if (ntohs(eh->ether_type) == ETHERTYPE_VLAN && 1527 (m->m_flags & M_VLANTAG) == 0) { 1528 /* 1529 * Extract vlan tag if hardware does not do it for us 1530 */ 1531 vlan_ether_decap(&m); 1532 if (m == NULL) 1533 return; 1534 eh = mtod(m, struct ether_header *); 1535 } 1536 ether_type = ntohs(eh->ether_type); 1537 1538 if ((m->m_flags & M_VLANTAG) && ether_type == ETHERTYPE_VLAN) { 1539 /* 1540 * To prevent possible dangerous recursion, 1541 * we don't do vlan-in-vlan 1542 */ 1543 ifp->if_noproto++; 1544 m_freem(m); 1545 return; 1546 } 1547 KKASSERT(ether_type != ETHERTYPE_VLAN); 1548 1549 /* 1550 * Map ether type to netisr id. 1551 */ 1552 switch (ether_type) { 1553 #ifdef INET 1554 case ETHERTYPE_IP: 1555 isr = NETISR_IP; 1556 break; 1557 1558 case ETHERTYPE_ARP: 1559 isr = NETISR_ARP; 1560 break; 1561 #endif 1562 1563 #ifdef INET6 1564 case ETHERTYPE_IPV6: 1565 isr = NETISR_IPV6; 1566 break; 1567 #endif 1568 1569 #ifdef IPX 1570 case ETHERTYPE_IPX: 1571 isr = NETISR_IPX; 1572 break; 1573 #endif 1574 1575 #ifdef NS 1576 case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ 1577 isr = NETISR_NS; 1578 break; 1579 #endif 1580 1581 #ifdef NETATALK 1582 case ETHERTYPE_AT: 1583 isr = NETISR_ATALK1; 1584 break; 1585 case ETHERTYPE_AARP: 1586 isr = NETISR_AARP; 1587 break; 1588 #endif 1589 1590 #ifdef MPLS 1591 case ETHERTYPE_MPLS: 1592 case ETHERTYPE_MPLS_MCAST: 1593 m->m_flags |= M_MPLSLABELED; 1594 isr = NETISR_MPLS; 1595 break; 1596 #endif 1597 1598 default: 1599 /* 1600 * NETISR_MAX is an invalid value; it is chosen to let 1601 * ether_mport() know that we are not able to decide 1602 * this packet's msgport here. 1603 */ 1604 isr = NETISR_MAX; 1605 break; 1606 } 1607 1608 /* 1609 * If the packet is in contiguous memory, following 1610 * m_adj() could ensure that the hidden ether header 1611 * will not be destroyed, else we will have to save 1612 * the ether header for the later restoration. 1613 */ 1614 if (m->m_pkthdr.len != m->m_len) { 1615 save_eh0 = *eh; 1616 save_eh = &save_eh0; 1617 } else { 1618 save_eh = NULL; 1619 } 1620 1621 /* 1622 * Temporarily remove ether header; ether_mport() 1623 * expects a packet without ether header. 1624 */ 1625 m_adj(m, sizeof(struct ether_header)); 1626 1627 /* 1628 * Find the packet's target msgport. 1629 */ 1630 port = ether_mport(isr, &m); 1631 if (port == NULL) { 1632 KKASSERT(m == NULL); 1633 return; 1634 } 1635 1636 /* 1637 * Restore ether header. 1638 */ 1639 if (save_eh != NULL) { 1640 ether_restore_header(&m, eh, save_eh); 1641 if (m == NULL) 1642 return; 1643 } else { 1644 m->m_data -= ETHER_HDR_LEN; 1645 m->m_len += ETHER_HDR_LEN; 1646 m->m_pkthdr.len += ETHER_HDR_LEN; 1647 } 1648 1649 /* 1650 * Initialize mbuf's netmsg packet _after_ possible 1651 * ether header restoration, else the initialized 1652 * netmsg packet may be lost during ether header 1653 * restoration. 1654 */ 1655 ether_init_netpacket(isr, m); 1656 1657 if (chain != NULL) { 1658 struct mbuf_chain *c; 1659 int cpuid; 1660 1661 m->m_pkthdr.header = port; /* XXX */ 1662 cpuid = port->mpu_td->td_gd->gd_cpuid; 1663 1664 c = &chain[cpuid]; 1665 if (c->mc_head == NULL) { 1666 c->mc_head = c->mc_tail = m; 1667 } else { 1668 c->mc_tail->m_nextpkt = m; 1669 c->mc_tail = m; 1670 } 1671 m->m_nextpkt = NULL; 1672 } else { 1673 lwkt_sendmsg(port, &m->m_hdr.mh_netmsg.nm_netmsg.nm_lmsg); 1674 } 1675 logether(chain_end, ifp); 1676 } 1677