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/5.1/sys/net/if_ef.c 111888 2003-03-04 23:19:55Z jlemon $ 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 }; 83 84 struct ef_link { 85 SLIST_ENTRY(ef_link) el_next; 86 struct ifnet *el_ifp; /* raw device for this clones */ 87 struct efnet *el_units[EF_NFT]; /* our clones */ 88 }; 89 90 static SLIST_HEAD(ef_link_head, ef_link) efdev = {NULL}; 91 static int efcount; 92 93 extern int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m); 94 extern int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, 95 struct sockaddr *dst, short *tp, int *hlen); 96 97 /* 98 static void ef_reset (struct ifnet *); 99 */ 100 static int ef_attach(struct efnet *sc); 101 static int ef_detach(struct efnet *sc); 102 static void ef_init(void *); 103 static int ef_ioctl(struct ifnet *, u_long, caddr_t); 104 static void ef_start(struct ifnet *); 105 static int ef_input(struct ifnet*, struct ether_header *, struct mbuf *); 106 static int ef_output(struct ifnet *ifp, struct mbuf **mp, 107 struct sockaddr *dst, short *tp, int *hlen); 108 109 static int ef_load(void); 110 static int ef_unload(void); 111 112 /* 113 * Install the interface, most of structure initialization done in ef_clone() 114 */ 115 static int 116 ef_attach(struct efnet *sc) 117 { 118 struct ifnet *ifp = (struct ifnet*)&sc->ef_ac.ac_if; 119 struct ifaddr *ifa2; 120 struct sockaddr_dl *sdl2; 121 122 ifp->if_output = ether_output; 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%d: attached\n", ifp->if_name, ifp->if_unit); 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 ef_link *sc = (struct ef_link*)ifp->if_softc;*/ 182 struct ifaddr *ifa = (struct ifaddr*)data; 183 int s, error; 184 185 EFDEBUG("IOCTL %ld for %s%d\n", cmd, ifp->if_name, ifp->if_unit); 186 error = 0; 187 s = splimp(); 188 switch (cmd) { 189 case SIOCSIFFLAGS: 190 error = 0; 191 break; 192 case SIOCSIFADDR: 193 if (ifp->if_unit == 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; 218 219 ifp->if_flags |= IFF_OACTIVE; 220 p = sc->ef_ifp; 221 222 EFDEBUG("\n"); 223 for (;;) { 224 IF_DEQUEUE(&ifp->if_snd, m); 225 if (m == 0) 226 break; 227 BPF_MTAP(ifp, m); 228 if (! IF_HANDOFF(&p->if_snd, m, p)) { 229 ifp->if_oerrors++; 230 continue; 231 } 232 ifp->if_opackets++; 233 } 234 ifp->if_flags &= ~IFF_OACTIVE; 235 return; 236 } 237 238 /* 239 * Inline functions do not put additional overhead to procedure call or 240 * parameter passing but simplify the code 241 */ 242 static int __inline 243 ef_inputEII(struct mbuf *m, struct ether_header *eh, u_short ether_type) 244 { 245 int isr; 246 247 switch(ether_type) { 248 #ifdef IPX 249 case ETHERTYPE_IPX: 250 isr = NETISR_IPX; 251 break; 252 #endif 253 #ifdef INET 254 case ETHERTYPE_IP: 255 if (ipflow_fastforward(m)) 256 return (0); 257 isr = NETISR_IP; 258 break; 259 260 case ETHERTYPE_ARP: 261 isr = NETISR_ARP; 262 break; 263 #endif 264 default: 265 return (EPROTONOSUPPORT); 266 } 267 netisr_dispatch(isr, m); 268 return (0); 269 } 270 271 static int __inline 272 ef_inputSNAP(struct mbuf *m, struct ether_header *eh, struct llc* l, 273 u_short ether_type) 274 { 275 int isr; 276 277 switch(ether_type) { 278 #ifdef IPX 279 case ETHERTYPE_IPX: 280 m_adj(m, 8); 281 isr = NETISR_IPX; 282 break; 283 #endif 284 default: 285 return (EPROTONOSUPPORT); 286 } 287 netisr_dispatch(isr, m); 288 return (0); 289 } 290 291 static int __inline 292 ef_input8022(struct mbuf *m, struct ether_header *eh, struct llc* l, 293 u_short ether_type) 294 { 295 int isr; 296 297 switch(ether_type) { 298 #ifdef IPX 299 case 0xe0: 300 m_adj(m, 3); 301 isr = NETISR_IPX; 302 break; 303 #endif 304 default: 305 return (EPROTONOSUPPORT); 306 } 307 netisr_dispatch(isr, m); 308 return (0); 309 } 310 311 /* 312 * Called from ether_input() 313 */ 314 static int 315 ef_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 316 { 317 u_short ether_type; 318 int ft = -1; 319 struct efnet *efp; 320 struct ifnet *eifp; 321 struct llc *l; 322 struct ef_link *efl; 323 int isr; 324 325 ether_type = ntohs(eh->ether_type); 326 if (ether_type < ETHERMTU) { 327 l = mtod(m, struct llc*); 328 if (l->llc_dsap == 0xff && l->llc_ssap == 0xff) { 329 /* 330 * Novell's "802.3" frame 331 */ 332 ft = ETHER_FT_8023; 333 } else if (l->llc_dsap == 0xaa && l->llc_ssap == 0xaa) { 334 /* 335 * 802.2/SNAP 336 */ 337 ft = ETHER_FT_SNAP; 338 ether_type = ntohs(l->llc_un.type_snap.ether_type); 339 } else if (l->llc_dsap == l->llc_ssap) { 340 /* 341 * 802.3/802.2 342 */ 343 ft = ETHER_FT_8022; 344 ether_type = l->llc_ssap; 345 } 346 } else 347 ft = ETHER_FT_EII; 348 349 if (ft == -1) { 350 EFDEBUG("Unrecognised ether_type %x\n", ether_type); 351 return EPROTONOSUPPORT; 352 } 353 354 /* 355 * Check if interface configured for the given frame 356 */ 357 efp = NULL; 358 SLIST_FOREACH(efl, &efdev, el_next) { 359 if (efl->el_ifp == ifp) { 360 efp = efl->el_units[ft]; 361 break; 362 } 363 } 364 if (efp == NULL) { 365 EFDEBUG("Can't find if for %d\n", ft); 366 return EPROTONOSUPPORT; 367 } 368 eifp = &efp->ef_ac.ac_if; 369 if ((eifp->if_flags & IFF_UP) == 0) 370 return EPROTONOSUPPORT; 371 eifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 372 m->m_pkthdr.rcvif = eifp; 373 374 if (eifp->if_bpf) { 375 struct mbuf m0; 376 m0.m_next = m; 377 m0.m_len = ETHER_HDR_LEN; 378 m0.m_data = (char *)eh; 379 BPF_MTAP(eifp, &m0); 380 } 381 /* 382 * Now we ready to adjust mbufs and pass them to protocol intr's 383 */ 384 switch(ft) { 385 case ETHER_FT_EII: 386 return (ef_inputEII(m, eh, ether_type)); 387 break; 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 break; 396 case ETHER_FT_8022: 397 return (ef_input8022(m, eh, l, ether_type)); 398 break; 399 default: 400 EFDEBUG("No support for frame %d and proto %04x\n", 401 ft, ether_type); 402 return (EPROTONOSUPPORT); 403 } 404 netisr_dispatch(isr, m); 405 return (0); 406 } 407 408 static int 409 ef_output(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, short *tp, 410 int *hlen) 411 { 412 struct mbuf *m = *mp; 413 u_char *cp; 414 short type; 415 416 if (ifp->if_type != IFT_XETHER) 417 return ENETDOWN; 418 switch (ifp->if_unit) { 419 case ETHER_FT_EII: 420 #ifdef IPX 421 type = htons(ETHERTYPE_IPX); 422 #else 423 return EPFNOSUPPORT; 424 #endif 425 break; 426 case ETHER_FT_8023: 427 type = htons(m->m_pkthdr.len); 428 break; 429 case ETHER_FT_8022: 430 M_PREPEND(m, ETHER_HDR_LEN + 3, M_TRYWAIT); 431 if (m == NULL) { 432 *mp = NULL; 433 return ENOBUFS; 434 } 435 /* 436 * Ensure that ethernet header and next three bytes 437 * will fit into single mbuf 438 */ 439 m = m_pullup(m, ETHER_HDR_LEN + 3); 440 if (m == NULL) { 441 *mp = NULL; 442 return ENOBUFS; 443 } 444 m_adj(m, ETHER_HDR_LEN); 445 type = htons(m->m_pkthdr.len); 446 cp = mtod(m, u_char *); 447 *cp++ = 0xE0; 448 *cp++ = 0xE0; 449 *cp++ = 0x03; 450 *hlen += 3; 451 break; 452 case ETHER_FT_SNAP: 453 M_PREPEND(m, 8, M_TRYWAIT); 454 if (m == NULL) { 455 *mp = NULL; 456 return ENOBUFS; 457 } 458 type = htons(m->m_pkthdr.len); 459 cp = mtod(m, u_char *); 460 bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8); 461 *hlen += 8; 462 break; 463 default: 464 return EPFNOSUPPORT; 465 } 466 *mp = m; 467 *tp = type; 468 return 0; 469 } 470 471 /* 472 * Create clone from the given interface 473 */ 474 static int 475 ef_clone(struct ef_link *efl, int ft) 476 { 477 struct efnet *efp; 478 struct ifnet *eifp; 479 struct ifnet *ifp = efl->el_ifp; 480 char cbuf[IFNAMSIZ], *ifname; 481 int ifnlen; 482 483 efp = (struct efnet*)malloc(sizeof(struct efnet), M_IFADDR, 484 M_WAITOK | M_ZERO); 485 if (efp == NULL) 486 return ENOMEM; 487 efp->ef_ifp = ifp; 488 eifp = &efp->ef_ac.ac_if; 489 ifnlen = 1 + snprintf(cbuf, sizeof(cbuf), "%s%df", ifp->if_name, 490 ifp->if_unit); 491 ifname = (char*)malloc(ifnlen, M_IFADDR, M_WAITOK); 492 eifp->if_name = strcpy(ifname, cbuf); 493 eifp->if_unit = ft; 494 eifp->if_softc = efp; 495 if (ifp->if_ioctl) 496 eifp->if_ioctl = ef_ioctl; 497 efl->el_units[ft] = efp; 498 return 0; 499 } 500 501 static int 502 ef_load(void) 503 { 504 struct ifnet *ifp; 505 struct efnet *efp; 506 struct ef_link *efl = NULL; 507 int error = 0, d; 508 509 IFNET_RLOCK(); 510 TAILQ_FOREACH(ifp, &ifnet, if_link) { 511 if (ifp->if_type != IFT_ETHER) continue; 512 EFDEBUG("Found interface %s%d\n", ifp->if_name, ifp->if_unit); 513 efl = (struct ef_link*)malloc(sizeof(struct ef_link), 514 M_IFADDR, M_WAITOK | M_ZERO); 515 if (efl == NULL) { 516 error = ENOMEM; 517 break; 518 } 519 520 efl->el_ifp = ifp; 521 #ifdef ETHER_II 522 error = ef_clone(efl, ETHER_FT_EII); 523 if (error) break; 524 #endif 525 #ifdef ETHER_8023 526 error = ef_clone(efl, ETHER_FT_8023); 527 if (error) break; 528 #endif 529 #ifdef ETHER_8022 530 error = ef_clone(efl, ETHER_FT_8022); 531 if (error) break; 532 #endif 533 #ifdef ETHER_SNAP 534 error = ef_clone(efl, ETHER_FT_SNAP); 535 if (error) break; 536 #endif 537 efcount++; 538 SLIST_INSERT_HEAD(&efdev, efl, el_next); 539 } 540 IFNET_RUNLOCK(); 541 if (error) { 542 if (efl) 543 SLIST_INSERT_HEAD(&efdev, efl, el_next); 544 SLIST_FOREACH(efl, &efdev, el_next) { 545 for (d = 0; d < EF_NFT; d++) 546 if (efl->el_units[d]) 547 free(efl->el_units[d], M_IFADDR); 548 free(efl, M_IFADDR); 549 } 550 return error; 551 } 552 SLIST_FOREACH(efl, &efdev, el_next) { 553 for (d = 0; d < EF_NFT; d++) { 554 efp = efl->el_units[d]; 555 if (efp) 556 ef_attach(efp); 557 } 558 } 559 ef_inputp = ef_input; 560 ef_outputp = ef_output; 561 EFDEBUG("Loaded\n"); 562 return 0; 563 } 564 565 static int 566 ef_unload(void) 567 { 568 struct efnet *efp; 569 struct ef_link *efl; 570 int d; 571 572 ef_inputp = NULL; 573 ef_outputp = NULL; 574 SLIST_FOREACH(efl, &efdev, el_next) { 575 for (d = 0; d < EF_NFT; d++) { 576 efp = efl->el_units[d]; 577 if (efp) { 578 ef_detach(efp); 579 } 580 } 581 } 582 EFDEBUG("Unloaded\n"); 583 return 0; 584 } 585 586 static int 587 if_ef_modevent(module_t mod, int type, void *data) 588 { 589 switch ((modeventtype_t)type) { 590 case MOD_LOAD: 591 return ef_load(); 592 case MOD_UNLOAD: 593 return ef_unload(); 594 default: 595 break; 596 } 597 return 0; 598 } 599 600 static moduledata_t if_ef_mod = { 601 "if_ef", if_ef_modevent, NULL 602 }; 603 604 DECLARE_MODULE(if_ef, if_ef_mod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE);
Cache object: 17044bbec5959b7c0e93fbbedcd54835
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