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/5.0/sys/net/if_ef.c 106939 2002-11-15 00:00:15Z sam $ 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 } 166 167 TAILQ_REMOVE(&ifnet, ifp, if_link); 168 splx(s); 169 return 0; 170 } 171 172 static void 173 ef_init(void *foo) { 174 return; 175 } 176 177 static int 178 ef_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 179 { 180 /* struct ef_link *sc = (struct ef_link*)ifp->if_softc;*/ 181 struct ifaddr *ifa = (struct ifaddr*)data; 182 int s, error; 183 184 EFDEBUG("IOCTL %ld for %s%d\n", cmd, ifp->if_name, ifp->if_unit); 185 error = 0; 186 s = splimp(); 187 switch (cmd) { 188 case SIOCSIFFLAGS: 189 error = 0; 190 break; 191 case SIOCSIFADDR: 192 if (ifp->if_unit == ETHER_FT_8023 && 193 ifa->ifa_addr->sa_family != AF_IPX) { 194 error = EAFNOSUPPORT; 195 break; 196 } 197 ifp->if_flags |= IFF_UP; 198 /* FALL THROUGH */ 199 default: 200 error = ether_ioctl(ifp, cmd, data); 201 break; 202 } 203 splx(s); 204 return error; 205 } 206 207 /* 208 * Currently packet prepared in the ether_output(), but this can be a better 209 * place. 210 */ 211 static void 212 ef_start(struct ifnet *ifp) 213 { 214 struct efnet *sc = (struct efnet*)ifp->if_softc; 215 struct ifnet *p; 216 struct mbuf *m; 217 218 ifp->if_flags |= IFF_OACTIVE; 219 p = sc->ef_ifp; 220 221 EFDEBUG("\n"); 222 for (;;) { 223 IF_DEQUEUE(&ifp->if_snd, m); 224 if (m == 0) 225 break; 226 BPF_MTAP(ifp, m); 227 if (! IF_HANDOFF(&p->if_snd, m, p)) { 228 ifp->if_oerrors++; 229 continue; 230 } 231 ifp->if_opackets++; 232 } 233 ifp->if_flags &= ~IFF_OACTIVE; 234 return; 235 } 236 237 /* 238 * Inline functions do not put additional overhead to procedure call or 239 * parameter passing but simplify the code 240 */ 241 static int __inline 242 ef_inputEII(struct mbuf *m, struct ether_header *eh, 243 u_short ether_type, struct ifqueue **inq) 244 { 245 switch(ether_type) { 246 #ifdef IPX 247 case ETHERTYPE_IPX: 248 schednetisr(NETISR_IPX); 249 *inq = &ipxintrq; 250 break; 251 #endif 252 #ifdef INET 253 case ETHERTYPE_IP: 254 if (ipflow_fastforward(m)) 255 return 1; 256 schednetisr(NETISR_IP); 257 *inq = &ipintrq; 258 break; 259 260 case ETHERTYPE_ARP: 261 schednetisr(NETISR_ARP); 262 *inq = &arpintrq; 263 break; 264 #endif 265 default: 266 return EPROTONOSUPPORT; 267 } 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, struct ifqueue **inq) 274 { 275 switch(ether_type) { 276 #ifdef IPX 277 case ETHERTYPE_IPX: 278 m_adj(m, 8); 279 schednetisr(NETISR_IPX); 280 *inq = &ipxintrq; 281 break; 282 #endif 283 default: 284 return EPROTONOSUPPORT; 285 } 286 return 0; 287 } 288 289 static int __inline 290 ef_input8022(struct mbuf *m, struct ether_header *eh, struct llc* l, 291 u_short ether_type, struct ifqueue **inq) 292 { 293 switch(ether_type) { 294 #ifdef IPX 295 case 0xe0: 296 m_adj(m, 3); 297 schednetisr(NETISR_IPX); 298 *inq = &ipxintrq; 299 break; 300 #endif 301 default: 302 return EPROTONOSUPPORT; 303 } 304 return 0; 305 } 306 /* 307 * Called from ether_input() 308 */ 309 static int 310 ef_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 311 { 312 u_short ether_type; 313 int ft = -1; 314 struct ifqueue *inq; 315 struct efnet *efp; 316 struct ifnet *eifp; 317 struct llc *l; 318 struct ef_link *efl; 319 320 ether_type = ntohs(eh->ether_type); 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_ac.ac_if; 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 if (eifp->if_bpf) { 370 struct mbuf m0; 371 m0.m_next = m; 372 m0.m_len = sizeof(struct ether_header); 373 m0.m_data = (char *)eh; 374 BPF_MTAP(eifp, &m0); 375 } 376 /* 377 * Now we ready to adjust mbufs and pass them to protocol intr's 378 */ 379 inq = NULL; 380 switch(ft) { 381 case ETHER_FT_EII: 382 if (ef_inputEII(m, eh, ether_type, &inq) != 0) 383 return EPROTONOSUPPORT; 384 break; 385 #ifdef IPX 386 case ETHER_FT_8023: /* only IPX can be here */ 387 schednetisr(NETISR_IPX); 388 inq = &ipxintrq; 389 break; 390 #endif 391 case ETHER_FT_SNAP: 392 if (ef_inputSNAP(m, eh, l, ether_type, &inq) != 0) 393 return EPROTONOSUPPORT; 394 break; 395 case ETHER_FT_8022: 396 if (ef_input8022(m, eh, l, ether_type, &inq) != 0) 397 return EPROTONOSUPPORT; 398 break; 399 } 400 401 if (inq == NULL) { 402 EFDEBUG("No support for frame %d and proto %04x\n", 403 ft, ether_type); 404 return EPROTONOSUPPORT; 405 } 406 (void) IF_HANDOFF(inq, m, NULL); 407 return 0; 408 } 409 410 static int 411 ef_output(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, short *tp, 412 int *hlen) 413 { 414 struct mbuf *m = *mp; 415 u_char *cp; 416 short type; 417 418 if (ifp->if_type != IFT_XETHER) 419 return ENETDOWN; 420 switch (ifp->if_unit) { 421 case ETHER_FT_EII: 422 #ifdef IPX 423 type = htons(ETHERTYPE_IPX); 424 #else 425 return EPFNOSUPPORT; 426 #endif 427 break; 428 case ETHER_FT_8023: 429 type = htons(m->m_pkthdr.len); 430 break; 431 case ETHER_FT_8022: 432 M_PREPEND(m, ETHER_HDR_LEN + 3, M_TRYWAIT); 433 if (m == NULL) { 434 *mp = NULL; 435 return ENOBUFS; 436 } 437 /* 438 * Ensure that ethernet header and next three bytes 439 * will fit into single mbuf 440 */ 441 m = m_pullup(m, ETHER_HDR_LEN + 3); 442 if (m == NULL) { 443 *mp = NULL; 444 return ENOBUFS; 445 } 446 m_adj(m, ETHER_HDR_LEN); 447 type = htons(m->m_pkthdr.len); 448 cp = mtod(m, u_char *); 449 *cp++ = 0xE0; 450 *cp++ = 0xE0; 451 *cp++ = 0x03; 452 *hlen += 3; 453 break; 454 case ETHER_FT_SNAP: 455 M_PREPEND(m, 8, M_TRYWAIT); 456 if (m == NULL) { 457 *mp = NULL; 458 return ENOBUFS; 459 } 460 type = htons(m->m_pkthdr.len); 461 cp = mtod(m, u_char *); 462 bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8); 463 *hlen += 8; 464 break; 465 default: 466 return EPFNOSUPPORT; 467 } 468 *mp = m; 469 *tp = type; 470 return 0; 471 } 472 473 /* 474 * Create clone from the given interface 475 */ 476 static int 477 ef_clone(struct ef_link *efl, int ft) 478 { 479 struct efnet *efp; 480 struct ifnet *eifp; 481 struct ifnet *ifp = efl->el_ifp; 482 char cbuf[IFNAMSIZ], *ifname; 483 int ifnlen; 484 485 efp = (struct efnet*)malloc(sizeof(struct efnet), M_IFADDR, 486 M_WAITOK | M_ZERO); 487 if (efp == NULL) 488 return ENOMEM; 489 efp->ef_ifp = ifp; 490 eifp = &efp->ef_ac.ac_if; 491 ifnlen = 1 + snprintf(cbuf, sizeof(cbuf), "%s%df", ifp->if_name, 492 ifp->if_unit); 493 ifname = (char*)malloc(ifnlen, M_IFADDR, M_WAITOK); 494 eifp->if_name = strcpy(ifname, cbuf); 495 eifp->if_unit = ft; 496 eifp->if_softc = efp; 497 if (ifp->if_ioctl) 498 eifp->if_ioctl = ef_ioctl; 499 efl->el_units[ft] = efp; 500 return 0; 501 } 502 503 static int 504 ef_load(void) 505 { 506 struct ifnet *ifp; 507 struct efnet *efp; 508 struct ef_link *efl = NULL; 509 int error = 0, d; 510 511 TAILQ_FOREACH(ifp, &ifnet, if_link) { 512 if (ifp->if_type != IFT_ETHER) continue; 513 EFDEBUG("Found interface %s%d\n", ifp->if_name, ifp->if_unit); 514 efl = (struct ef_link*)malloc(sizeof(struct ef_link), 515 M_IFADDR, M_WAITOK | M_ZERO); 516 if (efl == NULL) { 517 error = ENOMEM; 518 break; 519 } 520 521 efl->el_ifp = ifp; 522 #ifdef ETHER_II 523 error = ef_clone(efl, ETHER_FT_EII); 524 if (error) break; 525 #endif 526 #ifdef ETHER_8023 527 error = ef_clone(efl, ETHER_FT_8023); 528 if (error) break; 529 #endif 530 #ifdef ETHER_8022 531 error = ef_clone(efl, ETHER_FT_8022); 532 if (error) break; 533 #endif 534 #ifdef ETHER_SNAP 535 error = ef_clone(efl, ETHER_FT_SNAP); 536 if (error) break; 537 #endif 538 efcount++; 539 SLIST_INSERT_HEAD(&efdev, efl, el_next); 540 } 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: 752fd4bf1530d96c52713795a7be7843
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