Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/net/if_ef.c
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1 /*- 2 * Copyright (c) 1999, 2000 Boris Popov 3 * 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: releng/9.2/sys/net/if_ef.c 207554 2010-05-03 07:32:50Z sobomax $ 27 */ 28 29 #include "opt_inet.h" 30 #include "opt_ipx.h" 31 #include "opt_ef.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/sockio.h> 36 #include <sys/malloc.h> 37 #include <sys/mbuf.h> 38 #include <sys/socket.h> 39 #include <sys/syslog.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 43 #include <net/ethernet.h> 44 #include <net/if_llc.h> 45 #include <net/if.h> 46 #include <net/if_arp.h> 47 #include <net/if_dl.h> 48 #include <net/if_types.h> 49 #include <net/netisr.h> 50 #include <net/bpf.h> 51 #include <net/vnet.h> 52 53 #ifdef INET 54 #include <netinet/in.h> 55 #include <netinet/in_var.h> 56 #include <netinet/if_ether.h> 57 #endif 58 59 #ifdef IPX 60 #include <netipx/ipx.h> 61 #include <netipx/ipx_if.h> 62 #endif 63 64 /* If none of the supported layers is enabled explicitly enable them all */ 65 #if !defined(ETHER_II) && !defined(ETHER_8023) && !defined(ETHER_8022) && \ 66 !defined(ETHER_SNAP) 67 #define ETHER_II 1 68 #define ETHER_8023 1 69 #define ETHER_8022 1 70 #define ETHER_SNAP 1 71 #endif 72 73 /* internal frame types */ 74 #define ETHER_FT_EII 0 /* Ethernet_II - default */ 75 #define ETHER_FT_8023 1 /* 802.3 (Novell) */ 76 #define ETHER_FT_8022 2 /* 802.2 */ 77 #define ETHER_FT_SNAP 3 /* SNAP */ 78 #define EF_NFT 4 /* total number of frame types */ 79 80 #ifdef EF_DEBUG 81 #define EFDEBUG(format, args...) printf("%s: "format, __func__ ,## args) 82 #else 83 #define EFDEBUG(format, args...) 84 #endif 85 86 #define EFERROR(format, args...) printf("%s: "format, __func__ ,## args) 87 88 struct efnet { 89 struct ifnet *ef_ifp; 90 struct ifnet *ef_pifp; 91 int ef_frametype; 92 }; 93 94 struct ef_link { 95 SLIST_ENTRY(ef_link) el_next; 96 struct ifnet *el_ifp; /* raw device for this clones */ 97 struct efnet *el_units[EF_NFT]; /* our clones */ 98 }; 99 100 static SLIST_HEAD(ef_link_head, ef_link) efdev = {NULL}; 101 static int efcount; 102 103 extern int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m); 104 extern int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, 105 struct sockaddr *dst, short *tp, int *hlen); 106 107 /* 108 static void ef_reset (struct ifnet *); 109 */ 110 static int ef_attach(struct efnet *sc); 111 static int ef_detach(struct efnet *sc); 112 static void ef_init(void *); 113 static int ef_ioctl(struct ifnet *, u_long, caddr_t); 114 static void ef_start(struct ifnet *); 115 static int ef_input(struct ifnet*, struct ether_header *, struct mbuf *); 116 static int ef_output(struct ifnet *ifp, struct mbuf **mp, 117 struct sockaddr *dst, short *tp, int *hlen); 118 119 static int ef_load(void); 120 static int ef_unload(void); 121 122 /* 123 * Install the interface, most of structure initialization done in ef_clone() 124 */ 125 static int 126 ef_attach(struct efnet *sc) 127 { 128 struct ifnet *ifp = sc->ef_ifp; 129 130 ifp->if_start = ef_start; 131 ifp->if_init = ef_init; 132 ifp->if_snd.ifq_maxlen = ifqmaxlen; 133 ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 134 /* 135 * Attach the interface 136 */ 137 ether_ifattach(ifp, IF_LLADDR(sc->ef_pifp)); 138 139 ifp->if_resolvemulti = 0; 140 ifp->if_type = IFT_XETHER; 141 ifp->if_drv_flags |= IFF_DRV_RUNNING; 142 143 EFDEBUG("%s: attached\n", ifp->if_xname); 144 return 1; 145 } 146 147 /* 148 * This is for _testing_only_, just removes interface from interfaces list 149 */ 150 static int 151 ef_detach(struct efnet *sc) 152 { 153 struct ifnet *ifp = sc->ef_ifp; 154 int s; 155 156 s = splimp(); 157 158 ether_ifdetach(ifp); 159 if_free(ifp); 160 161 splx(s); 162 return 0; 163 } 164 165 static void 166 ef_init(void *foo) { 167 return; 168 } 169 170 static int 171 ef_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 172 { 173 struct efnet *sc = ifp->if_softc; 174 struct ifaddr *ifa = (struct ifaddr*)data; 175 int s, error; 176 177 EFDEBUG("IOCTL %ld for %s\n", cmd, ifp->if_xname); 178 error = 0; 179 s = splimp(); 180 switch (cmd) { 181 case SIOCSIFFLAGS: 182 error = 0; 183 break; 184 case SIOCSIFADDR: 185 if (sc->ef_frametype == ETHER_FT_8023 && 186 ifa->ifa_addr->sa_family != AF_IPX) { 187 error = EAFNOSUPPORT; 188 break; 189 } 190 ifp->if_flags |= IFF_UP; 191 /* FALL THROUGH */ 192 default: 193 error = ether_ioctl(ifp, cmd, data); 194 break; 195 } 196 splx(s); 197 return error; 198 } 199 200 /* 201 * Currently packet prepared in the ether_output(), but this can be a better 202 * place. 203 */ 204 static void 205 ef_start(struct ifnet *ifp) 206 { 207 struct efnet *sc = (struct efnet*)ifp->if_softc; 208 struct ifnet *p; 209 struct mbuf *m; 210 int error; 211 212 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 213 p = sc->ef_pifp; 214 215 EFDEBUG("\n"); 216 for (;;) { 217 IF_DEQUEUE(&ifp->if_snd, m); 218 if (m == 0) 219 break; 220 BPF_MTAP(ifp, m); 221 error = p->if_transmit(p, m); 222 if (error) { 223 ifp->if_oerrors++; 224 continue; 225 } 226 ifp->if_opackets++; 227 } 228 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 229 return; 230 } 231 232 /* 233 * Inline functions do not put additional overhead to procedure call or 234 * parameter passing but simplify the code 235 */ 236 static int __inline 237 ef_inputEII(struct mbuf *m, struct ether_header *eh, u_short ether_type) 238 { 239 int isr; 240 241 switch(ether_type) { 242 #ifdef IPX 243 case ETHERTYPE_IPX: 244 isr = NETISR_IPX; 245 break; 246 #endif 247 #ifdef INET 248 case ETHERTYPE_IP: 249 if ((m = ip_fastforward(m)) == NULL) 250 return (0); 251 isr = NETISR_IP; 252 break; 253 254 case ETHERTYPE_ARP: 255 isr = NETISR_ARP; 256 break; 257 #endif 258 default: 259 return (EPROTONOSUPPORT); 260 } 261 netisr_dispatch(isr, m); 262 return (0); 263 } 264 265 static int __inline 266 ef_inputSNAP(struct mbuf *m, struct ether_header *eh, struct llc* l, 267 u_short ether_type) 268 { 269 int isr; 270 271 switch(ether_type) { 272 #ifdef IPX 273 case ETHERTYPE_IPX: 274 m_adj(m, 8); 275 isr = NETISR_IPX; 276 break; 277 #endif 278 default: 279 return (EPROTONOSUPPORT); 280 } 281 netisr_dispatch(isr, m); 282 return (0); 283 } 284 285 static int __inline 286 ef_input8022(struct mbuf *m, struct ether_header *eh, struct llc* l, 287 u_short ether_type) 288 { 289 int isr; 290 291 switch(ether_type) { 292 #ifdef IPX 293 case 0xe0: 294 m_adj(m, 3); 295 isr = NETISR_IPX; 296 break; 297 #endif 298 default: 299 return (EPROTONOSUPPORT); 300 } 301 netisr_dispatch(isr, m); 302 return (0); 303 } 304 305 /* 306 * Called from ether_input() 307 */ 308 static int 309 ef_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 310 { 311 u_short ether_type; 312 int ft = -1; 313 struct efnet *efp; 314 struct ifnet *eifp; 315 struct llc *l; 316 struct ef_link *efl; 317 int isr; 318 319 ether_type = ntohs(eh->ether_type); 320 l = NULL; 321 if (ether_type < ETHERMTU) { 322 l = mtod(m, struct llc*); 323 if (l->llc_dsap == 0xff && l->llc_ssap == 0xff) { 324 /* 325 * Novell's "802.3" frame 326 */ 327 ft = ETHER_FT_8023; 328 } else if (l->llc_dsap == 0xaa && l->llc_ssap == 0xaa) { 329 /* 330 * 802.2/SNAP 331 */ 332 ft = ETHER_FT_SNAP; 333 ether_type = ntohs(l->llc_un.type_snap.ether_type); 334 } else if (l->llc_dsap == l->llc_ssap) { 335 /* 336 * 802.3/802.2 337 */ 338 ft = ETHER_FT_8022; 339 ether_type = l->llc_ssap; 340 } 341 } else 342 ft = ETHER_FT_EII; 343 344 if (ft == -1) { 345 EFDEBUG("Unrecognised ether_type %x\n", ether_type); 346 return EPROTONOSUPPORT; 347 } 348 349 /* 350 * Check if interface configured for the given frame 351 */ 352 efp = NULL; 353 SLIST_FOREACH(efl, &efdev, el_next) { 354 if (efl->el_ifp == ifp) { 355 efp = efl->el_units[ft]; 356 break; 357 } 358 } 359 if (efp == NULL) { 360 EFDEBUG("Can't find if for %d\n", ft); 361 return EPROTONOSUPPORT; 362 } 363 eifp = efp->ef_ifp; 364 if ((eifp->if_flags & IFF_UP) == 0) 365 return EPROTONOSUPPORT; 366 eifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 367 m->m_pkthdr.rcvif = eifp; 368 369 BPF_MTAP2(eifp, eh, ETHER_HDR_LEN, m); 370 /* 371 * Now we ready to adjust mbufs and pass them to protocol intr's 372 */ 373 switch(ft) { 374 case ETHER_FT_EII: 375 return (ef_inputEII(m, eh, ether_type)); 376 #ifdef IPX 377 case ETHER_FT_8023: /* only IPX can be here */ 378 isr = NETISR_IPX; 379 break; 380 #endif 381 case ETHER_FT_SNAP: 382 return (ef_inputSNAP(m, eh, l, ether_type)); 383 case ETHER_FT_8022: 384 return (ef_input8022(m, eh, l, ether_type)); 385 default: 386 EFDEBUG("No support for frame %d and proto %04x\n", 387 ft, ether_type); 388 return (EPROTONOSUPPORT); 389 } 390 netisr_dispatch(isr, m); 391 return (0); 392 } 393 394 static int 395 ef_output(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, short *tp, 396 int *hlen) 397 { 398 struct efnet *sc = (struct efnet*)ifp->if_softc; 399 struct mbuf *m = *mp; 400 u_char *cp; 401 short type; 402 403 if (ifp->if_type != IFT_XETHER) 404 return ENETDOWN; 405 switch (sc->ef_frametype) { 406 case ETHER_FT_EII: 407 #ifdef IPX 408 type = htons(ETHERTYPE_IPX); 409 #else 410 return EPFNOSUPPORT; 411 #endif 412 break; 413 case ETHER_FT_8023: 414 type = htons(m->m_pkthdr.len); 415 break; 416 case ETHER_FT_8022: 417 M_PREPEND(m, ETHER_HDR_LEN + 3, M_WAIT); 418 /* 419 * Ensure that ethernet header and next three bytes 420 * will fit into single mbuf 421 */ 422 m = m_pullup(m, ETHER_HDR_LEN + 3); 423 if (m == NULL) { 424 *mp = NULL; 425 return ENOBUFS; 426 } 427 m_adj(m, ETHER_HDR_LEN); 428 type = htons(m->m_pkthdr.len); 429 cp = mtod(m, u_char *); 430 *cp++ = 0xE0; 431 *cp++ = 0xE0; 432 *cp++ = 0x03; 433 *hlen += 3; 434 break; 435 case ETHER_FT_SNAP: 436 M_PREPEND(m, 8, M_WAIT); 437 type = htons(m->m_pkthdr.len); 438 cp = mtod(m, u_char *); 439 bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8); 440 *hlen += 8; 441 break; 442 default: 443 return EPFNOSUPPORT; 444 } 445 *mp = m; 446 *tp = type; 447 return 0; 448 } 449 450 /* 451 * Create clone from the given interface 452 */ 453 static int 454 ef_clone(struct ef_link *efl, int ft) 455 { 456 struct efnet *efp; 457 struct ifnet *eifp; 458 struct ifnet *ifp = efl->el_ifp; 459 460 efp = (struct efnet*)malloc(sizeof(struct efnet), M_IFADDR, 461 M_WAITOK | M_ZERO); 462 if (efp == NULL) 463 return ENOMEM; 464 efp->ef_pifp = ifp; 465 efp->ef_frametype = ft; 466 eifp = efp->ef_ifp = if_alloc(IFT_ETHER); 467 if (eifp == NULL) { 468 free(efp, M_IFADDR); 469 return (ENOSPC); 470 } 471 snprintf(eifp->if_xname, IFNAMSIZ, 472 "%sf%d", ifp->if_xname, efp->ef_frametype); 473 eifp->if_dname = "ef"; 474 eifp->if_dunit = IF_DUNIT_NONE; 475 eifp->if_softc = efp; 476 if (ifp->if_ioctl) 477 eifp->if_ioctl = ef_ioctl; 478 efl->el_units[ft] = efp; 479 return 0; 480 } 481 482 static int 483 ef_load(void) 484 { 485 VNET_ITERATOR_DECL(vnet_iter); 486 struct ifnet *ifp; 487 struct efnet *efp; 488 struct ef_link *efl = NULL, *efl_temp; 489 int error = 0, d; 490 491 VNET_LIST_RLOCK(); 492 VNET_FOREACH(vnet_iter) { 493 CURVNET_SET(vnet_iter); 494 495 /* 496 * XXXRW: The following loop walks the ifnet list while 497 * modifying it, something not well-supported by ifnet 498 * locking. To avoid lock upgrade/recursion issues, manually 499 * acquire a write lock of ifnet_sxlock here, rather than a 500 * read lock, so that when if_alloc() recurses the lock, we 501 * don't panic. This structure, in which if_ef automatically 502 * attaches to all ethernet interfaces, should be replaced 503 * with a model like that found in if_vlan, in which 504 * interfaces are explicitly configured, which would avoid 505 * this (and other) problems. 506 */ 507 sx_xlock(&ifnet_sxlock); 508 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 509 if (ifp->if_type != IFT_ETHER) continue; 510 EFDEBUG("Found interface %s\n", ifp->if_xname); 511 efl = (struct ef_link*)malloc(sizeof(struct ef_link), 512 M_IFADDR, M_WAITOK | M_ZERO); 513 if (efl == NULL) { 514 error = ENOMEM; 515 break; 516 } 517 518 efl->el_ifp = ifp; 519 #ifdef ETHER_II 520 error = ef_clone(efl, ETHER_FT_EII); 521 if (error) break; 522 #endif 523 #ifdef ETHER_8023 524 error = ef_clone(efl, ETHER_FT_8023); 525 if (error) break; 526 #endif 527 #ifdef ETHER_8022 528 error = ef_clone(efl, ETHER_FT_8022); 529 if (error) break; 530 #endif 531 #ifdef ETHER_SNAP 532 error = ef_clone(efl, ETHER_FT_SNAP); 533 if (error) break; 534 #endif 535 efcount++; 536 SLIST_INSERT_HEAD(&efdev, efl, el_next); 537 } 538 sx_xunlock(&ifnet_sxlock); 539 CURVNET_RESTORE(); 540 } 541 VNET_LIST_RUNLOCK(); 542 if (error) { 543 if (efl) 544 SLIST_INSERT_HEAD(&efdev, efl, el_next); 545 SLIST_FOREACH_SAFE(efl, &efdev, el_next, efl_temp) { 546 for (d = 0; d < EF_NFT; d++) 547 if (efl->el_units[d]) { 548 if (efl->el_units[d]->ef_pifp != NULL) 549 if_free(efl->el_units[d]->ef_pifp); 550 free(efl->el_units[d], M_IFADDR); 551 } 552 free(efl, M_IFADDR); 553 } 554 return error; 555 } 556 SLIST_FOREACH(efl, &efdev, el_next) { 557 for (d = 0; d < EF_NFT; d++) { 558 efp = efl->el_units[d]; 559 if (efp) 560 ef_attach(efp); 561 } 562 } 563 ef_inputp = ef_input; 564 ef_outputp = ef_output; 565 EFDEBUG("Loaded\n"); 566 return 0; 567 } 568 569 static int 570 ef_unload(void) 571 { 572 struct efnet *efp; 573 struct ef_link *efl; 574 int d; 575 576 ef_inputp = NULL; 577 ef_outputp = NULL; 578 SLIST_FOREACH(efl, &efdev, el_next) { 579 for (d = 0; d < EF_NFT; d++) { 580 efp = efl->el_units[d]; 581 if (efp) { 582 ef_detach(efp); 583 } 584 } 585 } 586 EFDEBUG("Unloaded\n"); 587 return 0; 588 } 589 590 static int 591 if_ef_modevent(module_t mod, int type, void *data) 592 { 593 switch ((modeventtype_t)type) { 594 case MOD_LOAD: 595 return ef_load(); 596 case MOD_UNLOAD: 597 return ef_unload(); 598 default: 599 return EOPNOTSUPP; 600 } 601 return 0; 602 } 603 604 static moduledata_t if_ef_mod = { 605 "if_ef", if_ef_modevent, NULL 606 }; 607 608 DECLARE_MODULE(if_ef, if_ef_mod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE);
Cache object: ca242c707a5d5e1b89e8ff2bf82d382d
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