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/5.3/sys/net/if_ef.c 136588 2004-10-16 08:43:07Z cvs2svn $ 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/route.h> 51 #include <net/bpf.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 /* internal frame types */ 65 #define ETHER_FT_EII 0 /* Ethernet_II - default */ 66 #define ETHER_FT_8023 1 /* 802.3 (Novell) */ 67 #define ETHER_FT_8022 2 /* 802.2 */ 68 #define ETHER_FT_SNAP 3 /* SNAP */ 69 #define EF_NFT 4 /* total number of frame types */ 70 71 #ifdef EF_DEBUG 72 #define EFDEBUG(format, args...) printf("%s: "format, __func__ ,## args) 73 #else 74 #define EFDEBUG(format, args...) 75 #endif 76 77 #define EFERROR(format, args...) printf("%s: "format, __func__ ,## args) 78 79 struct efnet { 80 struct arpcom ef_ac; 81 struct ifnet * ef_ifp; 82 int ef_frametype; 83 }; 84 85 struct ef_link { 86 SLIST_ENTRY(ef_link) el_next; 87 struct ifnet *el_ifp; /* raw device for this clones */ 88 struct efnet *el_units[EF_NFT]; /* our clones */ 89 }; 90 91 static SLIST_HEAD(ef_link_head, ef_link) efdev = {NULL}; 92 static int efcount; 93 94 extern int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m); 95 extern int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, 96 struct sockaddr *dst, short *tp, int *hlen); 97 98 /* 99 static void ef_reset (struct ifnet *); 100 */ 101 static int ef_attach(struct efnet *sc); 102 static int ef_detach(struct efnet *sc); 103 static void ef_init(void *); 104 static int ef_ioctl(struct ifnet *, u_long, caddr_t); 105 static void ef_start(struct ifnet *); 106 static int ef_input(struct ifnet*, struct ether_header *, struct mbuf *); 107 static int ef_output(struct ifnet *ifp, struct mbuf **mp, 108 struct sockaddr *dst, short *tp, int *hlen); 109 110 static int ef_load(void); 111 static int ef_unload(void); 112 113 /* 114 * Install the interface, most of structure initialization done in ef_clone() 115 */ 116 static int 117 ef_attach(struct efnet *sc) 118 { 119 struct ifnet *ifp = (struct ifnet*)&sc->ef_ac.ac_if; 120 struct ifaddr *ifa2; 121 struct sockaddr_dl *sdl2; 122 123 ifp->if_start = ef_start; 124 ifp->if_watchdog = NULL; 125 ifp->if_init = ef_init; 126 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 127 ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 128 /* 129 * Attach the interface 130 */ 131 ifa2 = ifaddr_byindex(sc->ef_ifp->if_index); 132 sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr; 133 ether_ifattach(ifp, LLADDR(sdl2)); 134 135 ifp->if_resolvemulti = 0; 136 ifp->if_type = IFT_XETHER; 137 ifp->if_flags |= IFF_RUNNING; 138 139 bcopy(LLADDR(sdl2), sc->ef_ac.ac_enaddr, ETHER_ADDR_LEN); 140 141 EFDEBUG("%s: attached\n", ifp->if_xname); 142 return 1; 143 } 144 145 /* 146 * This is for _testing_only_, just removes interface from interfaces list 147 */ 148 static int 149 ef_detach(struct efnet *sc) 150 { 151 struct ifnet *ifp = (struct ifnet*)&sc->ef_ac.ac_if; 152 int s; 153 154 s = splimp(); 155 156 if (ifp->if_flags & IFF_UP) { 157 if_down(ifp); 158 if (ifp->if_flags & IFF_RUNNING) { 159 /* find internet addresses and delete routes */ 160 register struct ifaddr *ifa; 161 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 162 rtinit(ifa, (int)RTM_DELETE, 0); 163 } 164 } 165 } 166 IFNET_WLOCK(); 167 TAILQ_REMOVE(&ifnet, ifp, if_link); 168 IFNET_WUNLOCK(); 169 splx(s); 170 return 0; 171 } 172 173 static void 174 ef_init(void *foo) { 175 return; 176 } 177 178 static int 179 ef_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 180 { 181 struct efnet *sc = ifp->if_softc; 182 struct ifaddr *ifa = (struct ifaddr*)data; 183 int s, error; 184 185 EFDEBUG("IOCTL %ld for %s\n", cmd, ifp->if_xname); 186 error = 0; 187 s = splimp(); 188 switch (cmd) { 189 case SIOCSIFFLAGS: 190 error = 0; 191 break; 192 case SIOCSIFADDR: 193 if (sc->ef_frametype == ETHER_FT_8023 && 194 ifa->ifa_addr->sa_family != AF_IPX) { 195 error = EAFNOSUPPORT; 196 break; 197 } 198 ifp->if_flags |= IFF_UP; 199 /* FALL THROUGH */ 200 default: 201 error = ether_ioctl(ifp, cmd, data); 202 break; 203 } 204 splx(s); 205 return error; 206 } 207 208 /* 209 * Currently packet prepared in the ether_output(), but this can be a better 210 * place. 211 */ 212 static void 213 ef_start(struct ifnet *ifp) 214 { 215 struct efnet *sc = (struct efnet*)ifp->if_softc; 216 struct ifnet *p; 217 struct mbuf *m; 218 int error; 219 220 ifp->if_flags |= IFF_OACTIVE; 221 p = sc->ef_ifp; 222 223 EFDEBUG("\n"); 224 for (;;) { 225 IF_DEQUEUE(&ifp->if_snd, m); 226 if (m == 0) 227 break; 228 BPF_MTAP(ifp, m); 229 IFQ_HANDOFF(p, m, error); 230 if (error) { 231 ifp->if_oerrors++; 232 continue; 233 } 234 ifp->if_opackets++; 235 } 236 ifp->if_flags &= ~IFF_OACTIVE; 237 return; 238 } 239 240 /* 241 * Inline functions do not put additional overhead to procedure call or 242 * parameter passing but simplify the code 243 */ 244 static int __inline 245 ef_inputEII(struct mbuf *m, struct ether_header *eh, u_short ether_type) 246 { 247 int isr; 248 249 switch(ether_type) { 250 #ifdef IPX 251 case ETHERTYPE_IPX: 252 isr = NETISR_IPX; 253 break; 254 #endif 255 #ifdef INET 256 case ETHERTYPE_IP: 257 if (ip_fastforward(m)) 258 return (0); 259 isr = NETISR_IP; 260 break; 261 262 case ETHERTYPE_ARP: 263 isr = NETISR_ARP; 264 break; 265 #endif 266 default: 267 return (EPROTONOSUPPORT); 268 } 269 netisr_dispatch(isr, m); 270 return (0); 271 } 272 273 static int __inline 274 ef_inputSNAP(struct mbuf *m, struct ether_header *eh, struct llc* l, 275 u_short ether_type) 276 { 277 int isr; 278 279 switch(ether_type) { 280 #ifdef IPX 281 case ETHERTYPE_IPX: 282 m_adj(m, 8); 283 isr = NETISR_IPX; 284 break; 285 #endif 286 default: 287 return (EPROTONOSUPPORT); 288 } 289 netisr_dispatch(isr, m); 290 return (0); 291 } 292 293 static int __inline 294 ef_input8022(struct mbuf *m, struct ether_header *eh, struct llc* l, 295 u_short ether_type) 296 { 297 int isr; 298 299 switch(ether_type) { 300 #ifdef IPX 301 case 0xe0: 302 m_adj(m, 3); 303 isr = NETISR_IPX; 304 break; 305 #endif 306 default: 307 return (EPROTONOSUPPORT); 308 } 309 netisr_dispatch(isr, m); 310 return (0); 311 } 312 313 /* 314 * Called from ether_input() 315 */ 316 static int 317 ef_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 318 { 319 u_short ether_type; 320 int ft = -1; 321 struct efnet *efp; 322 struct ifnet *eifp; 323 struct llc *l; 324 struct ef_link *efl; 325 int isr; 326 327 ether_type = ntohs(eh->ether_type); 328 l = NULL; 329 if (ether_type < ETHERMTU) { 330 l = mtod(m, struct llc*); 331 if (l->llc_dsap == 0xff && l->llc_ssap == 0xff) { 332 /* 333 * Novell's "802.3" frame 334 */ 335 ft = ETHER_FT_8023; 336 } else if (l->llc_dsap == 0xaa && l->llc_ssap == 0xaa) { 337 /* 338 * 802.2/SNAP 339 */ 340 ft = ETHER_FT_SNAP; 341 ether_type = ntohs(l->llc_un.type_snap.ether_type); 342 } else if (l->llc_dsap == l->llc_ssap) { 343 /* 344 * 802.3/802.2 345 */ 346 ft = ETHER_FT_8022; 347 ether_type = l->llc_ssap; 348 } 349 } else 350 ft = ETHER_FT_EII; 351 352 if (ft == -1) { 353 EFDEBUG("Unrecognised ether_type %x\n", ether_type); 354 return EPROTONOSUPPORT; 355 } 356 357 /* 358 * Check if interface configured for the given frame 359 */ 360 efp = NULL; 361 SLIST_FOREACH(efl, &efdev, el_next) { 362 if (efl->el_ifp == ifp) { 363 efp = efl->el_units[ft]; 364 break; 365 } 366 } 367 if (efp == NULL) { 368 EFDEBUG("Can't find if for %d\n", ft); 369 return EPROTONOSUPPORT; 370 } 371 eifp = &efp->ef_ac.ac_if; 372 if ((eifp->if_flags & IFF_UP) == 0) 373 return EPROTONOSUPPORT; 374 eifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 375 m->m_pkthdr.rcvif = eifp; 376 377 BPF_MTAP2(eifp, eh, ETHER_HDR_LEN, m); 378 /* 379 * Now we ready to adjust mbufs and pass them to protocol intr's 380 */ 381 switch(ft) { 382 case ETHER_FT_EII: 383 return (ef_inputEII(m, eh, ether_type)); 384 #ifdef IPX 385 case ETHER_FT_8023: /* only IPX can be here */ 386 isr = NETISR_IPX; 387 break; 388 #endif 389 case ETHER_FT_SNAP: 390 return (ef_inputSNAP(m, eh, l, ether_type)); 391 case ETHER_FT_8022: 392 return (ef_input8022(m, eh, l, ether_type)); 393 default: 394 EFDEBUG("No support for frame %d and proto %04x\n", 395 ft, ether_type); 396 return (EPROTONOSUPPORT); 397 } 398 netisr_dispatch(isr, m); 399 return (0); 400 } 401 402 static int 403 ef_output(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, short *tp, 404 int *hlen) 405 { 406 struct efnet *sc = (struct efnet*)ifp->if_softc; 407 struct mbuf *m = *mp; 408 u_char *cp; 409 short type; 410 411 if (ifp->if_type != IFT_XETHER) 412 return ENETDOWN; 413 switch (sc->ef_frametype) { 414 case ETHER_FT_EII: 415 #ifdef IPX 416 type = htons(ETHERTYPE_IPX); 417 #else 418 return EPFNOSUPPORT; 419 #endif 420 break; 421 case ETHER_FT_8023: 422 type = htons(m->m_pkthdr.len); 423 break; 424 case ETHER_FT_8022: 425 M_PREPEND(m, ETHER_HDR_LEN + 3, M_TRYWAIT); 426 if (m == NULL) { 427 *mp = NULL; 428 return ENOBUFS; 429 } 430 /* 431 * Ensure that ethernet header and next three bytes 432 * will fit into single mbuf 433 */ 434 m = m_pullup(m, ETHER_HDR_LEN + 3); 435 if (m == NULL) { 436 *mp = NULL; 437 return ENOBUFS; 438 } 439 m_adj(m, ETHER_HDR_LEN); 440 type = htons(m->m_pkthdr.len); 441 cp = mtod(m, u_char *); 442 *cp++ = 0xE0; 443 *cp++ = 0xE0; 444 *cp++ = 0x03; 445 *hlen += 3; 446 break; 447 case ETHER_FT_SNAP: 448 M_PREPEND(m, 8, M_TRYWAIT); 449 if (m == NULL) { 450 *mp = NULL; 451 return ENOBUFS; 452 } 453 type = htons(m->m_pkthdr.len); 454 cp = mtod(m, u_char *); 455 bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8); 456 *hlen += 8; 457 break; 458 default: 459 return EPFNOSUPPORT; 460 } 461 *mp = m; 462 *tp = type; 463 return 0; 464 } 465 466 /* 467 * Create clone from the given interface 468 */ 469 static int 470 ef_clone(struct ef_link *efl, int ft) 471 { 472 struct efnet *efp; 473 struct ifnet *eifp; 474 struct ifnet *ifp = efl->el_ifp; 475 476 efp = (struct efnet*)malloc(sizeof(struct efnet), M_IFADDR, 477 M_WAITOK | M_ZERO); 478 if (efp == NULL) 479 return ENOMEM; 480 efp->ef_ifp = ifp; 481 efp->ef_frametype = ft; 482 eifp = &efp->ef_ac.ac_if; 483 snprintf(eifp->if_xname, IFNAMSIZ, 484 "%sf%d", ifp->if_xname, efp->ef_frametype); 485 eifp->if_dname = "ef"; 486 eifp->if_dunit = IF_DUNIT_NONE; 487 eifp->if_softc = efp; 488 if (ifp->if_ioctl) 489 eifp->if_ioctl = ef_ioctl; 490 efl->el_units[ft] = efp; 491 return 0; 492 } 493 494 static int 495 ef_load(void) 496 { 497 struct ifnet *ifp; 498 struct efnet *efp; 499 struct ef_link *efl = NULL; 500 int error = 0, d; 501 502 IFNET_RLOCK(); 503 TAILQ_FOREACH(ifp, &ifnet, if_link) { 504 if (ifp->if_type != IFT_ETHER) continue; 505 EFDEBUG("Found interface %s\n", ifp->if_xname); 506 efl = (struct ef_link*)malloc(sizeof(struct ef_link), 507 M_IFADDR, M_WAITOK | M_ZERO); 508 if (efl == NULL) { 509 error = ENOMEM; 510 break; 511 } 512 513 efl->el_ifp = ifp; 514 #ifdef ETHER_II 515 error = ef_clone(efl, ETHER_FT_EII); 516 if (error) break; 517 #endif 518 #ifdef ETHER_8023 519 error = ef_clone(efl, ETHER_FT_8023); 520 if (error) break; 521 #endif 522 #ifdef ETHER_8022 523 error = ef_clone(efl, ETHER_FT_8022); 524 if (error) break; 525 #endif 526 #ifdef ETHER_SNAP 527 error = ef_clone(efl, ETHER_FT_SNAP); 528 if (error) break; 529 #endif 530 efcount++; 531 SLIST_INSERT_HEAD(&efdev, efl, el_next); 532 } 533 IFNET_RUNLOCK(); 534 if (error) { 535 if (efl) 536 SLIST_INSERT_HEAD(&efdev, efl, el_next); 537 SLIST_FOREACH(efl, &efdev, el_next) { 538 for (d = 0; d < EF_NFT; d++) 539 if (efl->el_units[d]) 540 free(efl->el_units[d], M_IFADDR); 541 free(efl, M_IFADDR); 542 } 543 return error; 544 } 545 SLIST_FOREACH(efl, &efdev, el_next) { 546 for (d = 0; d < EF_NFT; d++) { 547 efp = efl->el_units[d]; 548 if (efp) 549 ef_attach(efp); 550 } 551 } 552 ef_inputp = ef_input; 553 ef_outputp = ef_output; 554 EFDEBUG("Loaded\n"); 555 return 0; 556 } 557 558 static int 559 ef_unload(void) 560 { 561 struct efnet *efp; 562 struct ef_link *efl; 563 int d; 564 565 ef_inputp = NULL; 566 ef_outputp = NULL; 567 SLIST_FOREACH(efl, &efdev, el_next) { 568 for (d = 0; d < EF_NFT; d++) { 569 efp = efl->el_units[d]; 570 if (efp) { 571 ef_detach(efp); 572 } 573 } 574 } 575 EFDEBUG("Unloaded\n"); 576 return 0; 577 } 578 579 static int 580 if_ef_modevent(module_t mod, int type, void *data) 581 { 582 switch ((modeventtype_t)type) { 583 case MOD_LOAD: 584 return ef_load(); 585 case MOD_UNLOAD: 586 return ef_unload(); 587 default: 588 return EOPNOTSUPP; 589 } 590 return 0; 591 } 592 593 static moduledata_t if_ef_mod = { 594 "if_ef", if_ef_modevent, NULL 595 }; 596 597 DECLARE_MODULE(if_ef, if_ef_mod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE);
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