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/5.2/sys/net/if_ef.c 122702 2003-11-14 21:02:22Z andre $ 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_output = ether_output; 124 ifp->if_start = ef_start; 125 ifp->if_watchdog = NULL; 126 ifp->if_init = ef_init; 127 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 128 ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 129 /* 130 * Attach the interface 131 */ 132 ifa2 = ifaddr_byindex(sc->ef_ifp->if_index); 133 sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr; 134 ether_ifattach(ifp, LLADDR(sdl2)); 135 136 ifp->if_resolvemulti = 0; 137 ifp->if_type = IFT_XETHER; 138 ifp->if_flags |= IFF_RUNNING; 139 140 bcopy(LLADDR(sdl2), sc->ef_ac.ac_enaddr, ETHER_ADDR_LEN); 141 142 EFDEBUG("%s: attached\n", ifp->if_xname); 143 return 1; 144 } 145 146 /* 147 * This is for _testing_only_, just removes interface from interfaces list 148 */ 149 static int 150 ef_detach(struct efnet *sc) 151 { 152 struct ifnet *ifp = (struct ifnet*)&sc->ef_ac.ac_if; 153 int s; 154 155 s = splimp(); 156 157 if (ifp->if_flags & IFF_UP) { 158 if_down(ifp); 159 if (ifp->if_flags & IFF_RUNNING) { 160 /* find internet addresses and delete routes */ 161 register struct ifaddr *ifa; 162 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 163 rtinit(ifa, (int)RTM_DELETE, 0); 164 } 165 } 166 } 167 IFNET_WLOCK(); 168 TAILQ_REMOVE(&ifnet, ifp, if_link); 169 IFNET_WUNLOCK(); 170 splx(s); 171 return 0; 172 } 173 174 static void 175 ef_init(void *foo) { 176 return; 177 } 178 179 static int 180 ef_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 181 { 182 struct efnet *sc = ifp->if_softc; 183 struct ifaddr *ifa = (struct ifaddr*)data; 184 int s, error; 185 186 EFDEBUG("IOCTL %ld for %s\n", cmd, ifp->if_xname); 187 error = 0; 188 s = splimp(); 189 switch (cmd) { 190 case SIOCSIFFLAGS: 191 error = 0; 192 break; 193 case SIOCSIFADDR: 194 if (sc->ef_frametype == ETHER_FT_8023 && 195 ifa->ifa_addr->sa_family != AF_IPX) { 196 error = EAFNOSUPPORT; 197 break; 198 } 199 ifp->if_flags |= IFF_UP; 200 /* FALL THROUGH */ 201 default: 202 error = ether_ioctl(ifp, cmd, data); 203 break; 204 } 205 splx(s); 206 return error; 207 } 208 209 /* 210 * Currently packet prepared in the ether_output(), but this can be a better 211 * place. 212 */ 213 static void 214 ef_start(struct ifnet *ifp) 215 { 216 struct efnet *sc = (struct efnet*)ifp->if_softc; 217 struct ifnet *p; 218 struct mbuf *m; 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 if (! IF_HANDOFF(&p->if_snd, m, p)) { 230 ifp->if_oerrors++; 231 continue; 232 } 233 ifp->if_opackets++; 234 } 235 ifp->if_flags &= ~IFF_OACTIVE; 236 return; 237 } 238 239 /* 240 * Inline functions do not put additional overhead to procedure call or 241 * parameter passing but simplify the code 242 */ 243 static int __inline 244 ef_inputEII(struct mbuf *m, struct ether_header *eh, u_short ether_type) 245 { 246 int isr; 247 248 switch(ether_type) { 249 #ifdef IPX 250 case ETHERTYPE_IPX: 251 isr = NETISR_IPX; 252 break; 253 #endif 254 #ifdef INET 255 case ETHERTYPE_IP: 256 if (ip_fastforward(m)) 257 return (0); 258 isr = NETISR_IP; 259 break; 260 261 case ETHERTYPE_ARP: 262 isr = NETISR_ARP; 263 break; 264 #endif 265 default: 266 return (EPROTONOSUPPORT); 267 } 268 netisr_dispatch(isr, m); 269 return (0); 270 } 271 272 static int __inline 273 ef_inputSNAP(struct mbuf *m, struct ether_header *eh, struct llc* l, 274 u_short ether_type) 275 { 276 int isr; 277 278 switch(ether_type) { 279 #ifdef IPX 280 case ETHERTYPE_IPX: 281 m_adj(m, 8); 282 isr = NETISR_IPX; 283 break; 284 #endif 285 default: 286 return (EPROTONOSUPPORT); 287 } 288 netisr_dispatch(isr, m); 289 return (0); 290 } 291 292 static int __inline 293 ef_input8022(struct mbuf *m, struct ether_header *eh, struct llc* l, 294 u_short ether_type) 295 { 296 int isr; 297 298 switch(ether_type) { 299 #ifdef IPX 300 case 0xe0: 301 m_adj(m, 3); 302 isr = NETISR_IPX; 303 break; 304 #endif 305 default: 306 return (EPROTONOSUPPORT); 307 } 308 netisr_dispatch(isr, m); 309 return (0); 310 } 311 312 /* 313 * Called from ether_input() 314 */ 315 static int 316 ef_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 317 { 318 u_short ether_type; 319 int ft = -1; 320 struct efnet *efp; 321 struct ifnet *eifp; 322 struct llc *l; 323 struct ef_link *efl; 324 int isr; 325 326 ether_type = ntohs(eh->ether_type); 327 if (ether_type < ETHERMTU) { 328 l = mtod(m, struct llc*); 329 if (l->llc_dsap == 0xff && l->llc_ssap == 0xff) { 330 /* 331 * Novell's "802.3" frame 332 */ 333 ft = ETHER_FT_8023; 334 } else if (l->llc_dsap == 0xaa && l->llc_ssap == 0xaa) { 335 /* 336 * 802.2/SNAP 337 */ 338 ft = ETHER_FT_SNAP; 339 ether_type = ntohs(l->llc_un.type_snap.ether_type); 340 } else if (l->llc_dsap == l->llc_ssap) { 341 /* 342 * 802.3/802.2 343 */ 344 ft = ETHER_FT_8022; 345 ether_type = l->llc_ssap; 346 } 347 } else 348 ft = ETHER_FT_EII; 349 350 if (ft == -1) { 351 EFDEBUG("Unrecognised ether_type %x\n", ether_type); 352 return EPROTONOSUPPORT; 353 } 354 355 /* 356 * Check if interface configured for the given frame 357 */ 358 efp = NULL; 359 SLIST_FOREACH(efl, &efdev, el_next) { 360 if (efl->el_ifp == ifp) { 361 efp = efl->el_units[ft]; 362 break; 363 } 364 } 365 if (efp == NULL) { 366 EFDEBUG("Can't find if for %d\n", ft); 367 return EPROTONOSUPPORT; 368 } 369 eifp = &efp->ef_ac.ac_if; 370 if ((eifp->if_flags & IFF_UP) == 0) 371 return EPROTONOSUPPORT; 372 eifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 373 m->m_pkthdr.rcvif = eifp; 374 375 if (eifp->if_bpf) { 376 struct mbuf m0; 377 m0.m_next = m; 378 m0.m_len = ETHER_HDR_LEN; 379 m0.m_data = (char *)eh; 380 BPF_MTAP(eifp, &m0); 381 } 382 /* 383 * Now we ready to adjust mbufs and pass them to protocol intr's 384 */ 385 switch(ft) { 386 case ETHER_FT_EII: 387 return (ef_inputEII(m, eh, ether_type)); 388 #ifdef IPX 389 case ETHER_FT_8023: /* only IPX can be here */ 390 isr = NETISR_IPX; 391 break; 392 #endif 393 case ETHER_FT_SNAP: 394 return (ef_inputSNAP(m, eh, l, ether_type)); 395 case ETHER_FT_8022: 396 return (ef_input8022(m, eh, l, ether_type)); 397 default: 398 EFDEBUG("No support for frame %d and proto %04x\n", 399 ft, ether_type); 400 return (EPROTONOSUPPORT); 401 } 402 netisr_dispatch(isr, m); 403 return (0); 404 } 405 406 static int 407 ef_output(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, short *tp, 408 int *hlen) 409 { 410 struct efnet *sc = (struct efnet*)ifp->if_softc; 411 struct mbuf *m = *mp; 412 u_char *cp; 413 short type; 414 415 if (ifp->if_type != IFT_XETHER) 416 return ENETDOWN; 417 switch (sc->ef_frametype) { 418 case ETHER_FT_EII: 419 #ifdef IPX 420 type = htons(ETHERTYPE_IPX); 421 #else 422 return EPFNOSUPPORT; 423 #endif 424 break; 425 case ETHER_FT_8023: 426 type = htons(m->m_pkthdr.len); 427 break; 428 case ETHER_FT_8022: 429 M_PREPEND(m, ETHER_HDR_LEN + 3, M_TRYWAIT); 430 if (m == NULL) { 431 *mp = NULL; 432 return ENOBUFS; 433 } 434 /* 435 * Ensure that ethernet header and next three bytes 436 * will fit into single mbuf 437 */ 438 m = m_pullup(m, ETHER_HDR_LEN + 3); 439 if (m == NULL) { 440 *mp = NULL; 441 return ENOBUFS; 442 } 443 m_adj(m, ETHER_HDR_LEN); 444 type = htons(m->m_pkthdr.len); 445 cp = mtod(m, u_char *); 446 *cp++ = 0xE0; 447 *cp++ = 0xE0; 448 *cp++ = 0x03; 449 *hlen += 3; 450 break; 451 case ETHER_FT_SNAP: 452 M_PREPEND(m, 8, M_TRYWAIT); 453 if (m == NULL) { 454 *mp = NULL; 455 return ENOBUFS; 456 } 457 type = htons(m->m_pkthdr.len); 458 cp = mtod(m, u_char *); 459 bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8); 460 *hlen += 8; 461 break; 462 default: 463 return EPFNOSUPPORT; 464 } 465 *mp = m; 466 *tp = type; 467 return 0; 468 } 469 470 /* 471 * Create clone from the given interface 472 */ 473 static int 474 ef_clone(struct ef_link *efl, int ft) 475 { 476 struct efnet *efp; 477 struct ifnet *eifp; 478 struct ifnet *ifp = efl->el_ifp; 479 480 efp = (struct efnet*)malloc(sizeof(struct efnet), M_IFADDR, 481 M_WAITOK | M_ZERO); 482 if (efp == NULL) 483 return ENOMEM; 484 efp->ef_ifp = ifp; 485 efp->ef_frametype = ft; 486 eifp = &efp->ef_ac.ac_if; 487 snprintf(eifp->if_xname, IFNAMSIZ, 488 "%sf%d", ifp->if_xname, efp->ef_frametype); 489 eifp->if_dname = "ef"; 490 eifp->if_dunit = IF_DUNIT_NONE; 491 eifp->if_softc = efp; 492 if (ifp->if_ioctl) 493 eifp->if_ioctl = ef_ioctl; 494 efl->el_units[ft] = efp; 495 return 0; 496 } 497 498 static int 499 ef_load(void) 500 { 501 struct ifnet *ifp; 502 struct efnet *efp; 503 struct ef_link *efl = NULL; 504 int error = 0, d; 505 506 IFNET_RLOCK(); 507 TAILQ_FOREACH(ifp, &ifnet, if_link) { 508 if (ifp->if_type != IFT_ETHER) continue; 509 EFDEBUG("Found interface %s\n", ifp->if_xname); 510 efl = (struct ef_link*)malloc(sizeof(struct ef_link), 511 M_IFADDR, M_WAITOK | M_ZERO); 512 if (efl == NULL) { 513 error = ENOMEM; 514 break; 515 } 516 517 efl->el_ifp = ifp; 518 #ifdef ETHER_II 519 error = ef_clone(efl, ETHER_FT_EII); 520 if (error) break; 521 #endif 522 #ifdef ETHER_8023 523 error = ef_clone(efl, ETHER_FT_8023); 524 if (error) break; 525 #endif 526 #ifdef ETHER_8022 527 error = ef_clone(efl, ETHER_FT_8022); 528 if (error) break; 529 #endif 530 #ifdef ETHER_SNAP 531 error = ef_clone(efl, ETHER_FT_SNAP); 532 if (error) break; 533 #endif 534 efcount++; 535 SLIST_INSERT_HEAD(&efdev, efl, el_next); 536 } 537 IFNET_RUNLOCK(); 538 if (error) { 539 if (efl) 540 SLIST_INSERT_HEAD(&efdev, efl, el_next); 541 SLIST_FOREACH(efl, &efdev, el_next) { 542 for (d = 0; d < EF_NFT; d++) 543 if (efl->el_units[d]) 544 free(efl->el_units[d], M_IFADDR); 545 free(efl, M_IFADDR); 546 } 547 return error; 548 } 549 SLIST_FOREACH(efl, &efdev, el_next) { 550 for (d = 0; d < EF_NFT; d++) { 551 efp = efl->el_units[d]; 552 if (efp) 553 ef_attach(efp); 554 } 555 } 556 ef_inputp = ef_input; 557 ef_outputp = ef_output; 558 EFDEBUG("Loaded\n"); 559 return 0; 560 } 561 562 static int 563 ef_unload(void) 564 { 565 struct efnet *efp; 566 struct ef_link *efl; 567 int d; 568 569 ef_inputp = NULL; 570 ef_outputp = NULL; 571 SLIST_FOREACH(efl, &efdev, el_next) { 572 for (d = 0; d < EF_NFT; d++) { 573 efp = efl->el_units[d]; 574 if (efp) { 575 ef_detach(efp); 576 } 577 } 578 } 579 EFDEBUG("Unloaded\n"); 580 return 0; 581 } 582 583 static int 584 if_ef_modevent(module_t mod, int type, void *data) 585 { 586 switch ((modeventtype_t)type) { 587 case MOD_LOAD: 588 return ef_load(); 589 case MOD_UNLOAD: 590 return ef_unload(); 591 default: 592 break; 593 } 594 return 0; 595 } 596 597 static moduledata_t if_ef_mod = { 598 "if_ef", if_ef_modevent, NULL 599 }; 600 601 DECLARE_MODULE(if_ef, if_ef_mod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE);
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