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 * $FreeBSD$ 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, __FUNCTION__ ,## args) 73 #else 74 #define EFDEBUG(format, args...) 75 #endif 76 77 #define EFERROR(format, args...) printf("%s: "format, __FUNCTION__ ,## 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 *ifa1, *ifa2; 120 struct sockaddr_dl *sdl1, *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 ether_ifattach(ifp, ETHER_BPF_SUPPORTED); 132 133 ifp->if_resolvemulti = 0; 134 ifp->if_type = IFT_XETHER; 135 ifp->if_flags |= IFF_RUNNING; 136 137 ifa1 = ifnet_addrs[ifp->if_index - 1]; 138 ifa2 = ifnet_addrs[sc->ef_ifp->if_index - 1]; 139 sdl1 = (struct sockaddr_dl *)ifa1->ifa_addr; 140 sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr; 141 sdl1->sdl_type = IFT_ETHER; 142 sdl1->sdl_alen = ETHER_ADDR_LEN; 143 bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN); 144 bcopy(LLADDR(sdl2), sc->ef_ac.ac_enaddr, ETHER_ADDR_LEN); 145 146 EFDEBUG("%s%d: attached\n", ifp->if_name, ifp->if_unit); 147 return 1; 148 } 149 150 /* 151 * This is for _testing_only_, just removes interface from interfaces list 152 */ 153 static int 154 ef_detach(struct efnet *sc) 155 { 156 struct ifnet *ifp = (struct ifnet*)&sc->ef_ac.ac_if; 157 int s; 158 159 s = splimp(); 160 161 if (ifp->if_flags & IFF_UP) { 162 if_down(ifp); 163 if (ifp->if_flags & IFF_RUNNING) { 164 /* find internet addresses and delete routes */ 165 register struct ifaddr *ifa; 166 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 167 rtinit(ifa, (int)RTM_DELETE, 0); 168 } 169 } 170 } 171 172 TAILQ_REMOVE(&ifnet, ifp, if_link); 173 splx(s); 174 return 0; 175 } 176 177 static void 178 ef_init(void *foo) { 179 return; 180 } 181 182 static int 183 ef_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 184 { 185 /* struct ef_link *sc = (struct ef_link*)ifp->if_softc;*/ 186 struct ifaddr *ifa = (struct ifaddr*)data; 187 int s, error; 188 189 EFDEBUG("IOCTL %ld for %s%d\n", cmd, ifp->if_name, ifp->if_unit); 190 error = 0; 191 s = splimp(); 192 switch (cmd) { 193 case SIOCSIFADDR: 194 if (ifp->if_unit == 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 case SIOCGIFADDR: 202 case SIOCSIFMTU: 203 error = ether_ioctl(ifp, cmd, data); 204 break; 205 case SIOCSIFFLAGS: 206 error = 0; 207 break; 208 default: 209 error = EINVAL; 210 } 211 splx(s); 212 return error; 213 } 214 215 /* 216 * Currently packet prepared in the ether_output(), but this can be a better 217 * place. 218 */ 219 static void 220 ef_start(struct ifnet *ifp) 221 { 222 struct efnet *sc = (struct efnet*)ifp->if_softc; 223 struct ifnet *p; 224 struct mbuf *m; 225 226 ifp->if_flags |= IFF_OACTIVE; 227 p = sc->ef_ifp; 228 229 EFDEBUG("\n"); 230 for (;;) { 231 IF_DEQUEUE(&ifp->if_snd, m); 232 if (m == 0) 233 break; 234 if (ifp->if_bpf) 235 bpf_mtap(ifp, m); 236 if (IF_QFULL(&p->if_snd)) { 237 IF_DROP(&p->if_snd); 238 ifp->if_oerrors++; 239 m_freem(m); 240 continue; 241 } 242 IF_ENQUEUE(&p->if_snd, m); 243 if ((p->if_flags & IFF_OACTIVE) == 0) { 244 p->if_start(p); 245 ifp->if_opackets++; 246 } 247 } 248 ifp->if_flags &= ~IFF_OACTIVE; 249 return; 250 } 251 252 /* 253 * Inline functions do not put additional overhead to procedure call or 254 * parameter passing but simplify the code 255 */ 256 static int __inline 257 ef_inputEII(struct mbuf *m, struct ether_header *eh, struct llc* l, 258 u_short ether_type, struct ifqueue **inq) 259 { 260 switch(ether_type) { 261 #ifdef IPX 262 case ETHERTYPE_IPX: 263 schednetisr(NETISR_IPX); 264 *inq = &ipxintrq; 265 break; 266 #endif 267 #ifdef INET 268 case ETHERTYPE_IP: 269 if (ipflow_fastforward(m)) 270 return 1; 271 schednetisr(NETISR_IP); 272 *inq = &ipintrq; 273 break; 274 275 case ETHERTYPE_ARP: 276 schednetisr(NETISR_ARP); 277 *inq = &arpintrq; 278 break; 279 #endif 280 default: 281 return EPROTONOSUPPORT; 282 } 283 return 0; 284 } 285 286 static int __inline 287 ef_inputSNAP(struct mbuf *m, struct ether_header *eh, struct llc* l, 288 u_short ether_type, struct ifqueue **inq) 289 { 290 switch(ether_type) { 291 #ifdef IPX 292 case ETHERTYPE_IPX: 293 m_adj(m, 8); 294 schednetisr(NETISR_IPX); 295 *inq = &ipxintrq; 296 break; 297 #endif 298 default: 299 return EPROTONOSUPPORT; 300 } 301 return 0; 302 } 303 304 static int __inline 305 ef_input8022(struct mbuf *m, struct ether_header *eh, struct llc* l, 306 u_short ether_type, struct ifqueue **inq) 307 { 308 switch(ether_type) { 309 #ifdef IPX 310 case 0xe0: 311 m_adj(m, 3); 312 schednetisr(NETISR_IPX); 313 *inq = &ipxintrq; 314 break; 315 #endif 316 default: 317 return EPROTONOSUPPORT; 318 } 319 return 0; 320 } 321 /* 322 * Called from ether_input() 323 */ 324 static int 325 ef_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) 326 { 327 u_short ether_type; 328 int s, ft = -1; 329 struct ifqueue *inq; 330 struct efnet *efp; 331 struct ifnet *eifp; 332 struct llc *l; 333 struct ef_link *efl; 334 335 ether_type = ntohs(eh->ether_type); 336 if (ether_type < ETHERMTU) { 337 l = mtod(m, struct llc*); 338 if (l->llc_dsap == 0xff && l->llc_ssap == 0xff) { 339 /* 340 * Novell's "802.3" frame 341 */ 342 ft = ETHER_FT_8023; 343 } else if (l->llc_dsap == 0xaa && l->llc_ssap == 0xaa) { 344 /* 345 * 802.2/SNAP 346 */ 347 ft = ETHER_FT_SNAP; 348 ether_type = ntohs(l->llc_un.type_snap.ether_type); 349 } else if (l->llc_dsap == l->llc_ssap) { 350 /* 351 * 802.3/802.2 352 */ 353 ft = ETHER_FT_8022; 354 ether_type = l->llc_ssap; 355 } 356 } else 357 ft = ETHER_FT_EII; 358 359 if (ft == -1) { 360 EFDEBUG("Unrecognised ether_type %x\n", ether_type); 361 return EPROTONOSUPPORT; 362 } 363 364 /* 365 * Check if interface configured for the given frame 366 */ 367 efp = NULL; 368 SLIST_FOREACH(efl, &efdev, el_next) { 369 if (efl->el_ifp == ifp) { 370 efp = efl->el_units[ft]; 371 break; 372 } 373 } 374 if (efp == NULL) { 375 EFDEBUG("Can't find if for %d\n", ft); 376 return EPROTONOSUPPORT; 377 } 378 eifp = &efp->ef_ac.ac_if; 379 if ((eifp->if_flags & IFF_UP) == 0) 380 return EPROTONOSUPPORT; 381 eifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 382 m->m_pkthdr.rcvif = eifp; 383 384 if (eifp->if_bpf) { 385 struct mbuf m0; 386 m0.m_next = m; 387 m0.m_len = sizeof(struct ether_header); 388 m0.m_data = (char *)eh; 389 bpf_mtap(eifp, &m0); 390 } 391 /* 392 * Now we ready to adjust mbufs and pass them to protocol intr's 393 */ 394 inq = NULL; 395 switch(ft) { 396 case ETHER_FT_EII: 397 if (ef_inputEII(m, eh, l, ether_type, &inq) != 0) 398 return EPROTONOSUPPORT; 399 break; 400 #ifdef IPX 401 case ETHER_FT_8023: /* only IPX can be here */ 402 schednetisr(NETISR_IPX); 403 inq = &ipxintrq; 404 break; 405 #endif 406 case ETHER_FT_SNAP: 407 if (ef_inputSNAP(m, eh, l, ether_type, &inq) != 0) 408 return EPROTONOSUPPORT; 409 break; 410 case ETHER_FT_8022: 411 if (ef_input8022(m, eh, l, ether_type, &inq) != 0) 412 return EPROTONOSUPPORT; 413 break; 414 } 415 416 if (inq == NULL) { 417 EFDEBUG("No support for frame %d and proto %04x\n", 418 ft, ether_type); 419 return EPROTONOSUPPORT; 420 } 421 s = splimp(); 422 if (IF_QFULL(inq)) { 423 IF_DROP(inq); 424 m_freem(m); 425 } else 426 IF_ENQUEUE(inq, m); 427 splx(s); 428 return 0; 429 } 430 431 static int 432 ef_output(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, short *tp, 433 int *hlen) 434 { 435 struct mbuf *m = *mp; 436 u_char *cp; 437 short type; 438 439 if (ifp->if_type != IFT_XETHER) 440 return ENETDOWN; 441 switch (ifp->if_unit) { 442 case ETHER_FT_EII: 443 #ifdef IPX 444 type = htons(ETHERTYPE_IPX); 445 #else 446 return EPFNOSUPPORT; 447 #endif 448 break; 449 case ETHER_FT_8023: 450 type = htons(m->m_pkthdr.len); 451 break; 452 case ETHER_FT_8022: 453 M_PREPEND(m, ETHER_HDR_LEN + 3, M_WAIT); 454 if (m == NULL) { 455 *mp = NULL; 456 return ENOBUFS; 457 } 458 /* 459 * Ensure that ethernet header and next three bytes 460 * will fit into single mbuf 461 */ 462 m = m_pullup(m, ETHER_HDR_LEN + 3); 463 if (m == NULL) { 464 *mp = NULL; 465 return ENOBUFS; 466 } 467 m_adj(m, ETHER_HDR_LEN); 468 type = htons(m->m_pkthdr.len); 469 cp = mtod(m, u_char *); 470 *cp++ = 0xE0; 471 *cp++ = 0xE0; 472 *cp++ = 0x03; 473 *hlen += 3; 474 break; 475 case ETHER_FT_SNAP: 476 M_PREPEND(m, 8, M_WAIT); 477 if (m == NULL) { 478 *mp = NULL; 479 return ENOBUFS; 480 } 481 type = htons(m->m_pkthdr.len); 482 cp = mtod(m, u_char *); 483 bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8); 484 *hlen += 8; 485 break; 486 default: 487 return EPFNOSUPPORT; 488 } 489 *mp = m; 490 *tp = type; 491 return 0; 492 } 493 494 /* 495 * Create clone from the given interface 496 */ 497 static int 498 ef_clone(struct ef_link *efl, int ft) 499 { 500 struct efnet *efp; 501 struct ifnet *eifp; 502 struct ifnet *ifp = efl->el_ifp; 503 char cbuf[IFNAMSIZ], *ifname; 504 int ifnlen; 505 506 efp = (struct efnet*)malloc(sizeof(struct efnet), M_IFADDR, 507 M_WAITOK | M_ZERO); 508 if (efp == NULL) 509 return ENOMEM; 510 efp->ef_ifp = ifp; 511 eifp = &efp->ef_ac.ac_if; 512 ifnlen = 1 + snprintf(cbuf, sizeof(cbuf), "%s%df", ifp->if_name, 513 ifp->if_unit); 514 ifname = (char*)malloc(ifnlen, M_IFADDR, M_WAITOK); 515 eifp->if_name = strcpy(ifname, cbuf); 516 eifp->if_unit = ft; 517 eifp->if_softc = efp; 518 if (ifp->if_ioctl) 519 eifp->if_ioctl = ef_ioctl; 520 efl->el_units[ft] = efp; 521 return 0; 522 } 523 524 static int 525 ef_load(void) 526 { 527 struct ifnet *ifp; 528 struct efnet *efp; 529 struct ef_link *efl = NULL; 530 int error = 0, d; 531 532 TAILQ_FOREACH(ifp, &ifnet, if_link) { 533 if (ifp->if_type != IFT_ETHER) continue; 534 EFDEBUG("Found interface %s%d\n", ifp->if_name, ifp->if_unit); 535 efl = (struct ef_link*)malloc(sizeof(struct ef_link), 536 M_IFADDR, M_WAITOK); 537 if (efl == NULL) { 538 error = ENOMEM; 539 break; 540 } 541 bzero(efl, sizeof(*efl)); 542 543 efl->el_ifp = ifp; 544 #ifdef ETHER_II 545 error = ef_clone(efl, ETHER_FT_EII); 546 if (error) break; 547 #endif 548 #ifdef ETHER_8023 549 error = ef_clone(efl, ETHER_FT_8023); 550 if (error) break; 551 #endif 552 #ifdef ETHER_8022 553 error = ef_clone(efl, ETHER_FT_8022); 554 if (error) break; 555 #endif 556 #ifdef ETHER_SNAP 557 error = ef_clone(efl, ETHER_FT_SNAP); 558 if (error) break; 559 #endif 560 efcount++; 561 SLIST_INSERT_HEAD(&efdev, efl, el_next); 562 } 563 if (error) { 564 if (efl) 565 SLIST_INSERT_HEAD(&efdev, efl, el_next); 566 SLIST_FOREACH(efl, &efdev, el_next) { 567 for (d = 0; d < EF_NFT; d++) 568 if (efl->el_units[d]) 569 free(efl->el_units[d], M_IFADDR); 570 free(efl, M_IFADDR); 571 } 572 return error; 573 } 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_attach(efp); 579 } 580 } 581 ef_inputp = ef_input; 582 ef_outputp = ef_output; 583 EFDEBUG("Loaded\n"); 584 return 0; 585 } 586 587 static int 588 ef_unload(void) 589 { 590 struct efnet *efp; 591 struct ef_link *efl; 592 int d; 593 594 ef_inputp = NULL; 595 ef_outputp = NULL; 596 SLIST_FOREACH(efl, &efdev, el_next) { 597 for (d = 0; d < EF_NFT; d++) { 598 efp = efl->el_units[d]; 599 if (efp) { 600 ef_detach(efp); 601 } 602 } 603 } 604 EFDEBUG("Unloaded\n"); 605 return 0; 606 } 607 608 static int 609 if_ef_modevent(module_t mod, int type, void *data) 610 { 611 switch ((modeventtype_t)type) { 612 case MOD_LOAD: 613 return ef_load(); 614 case MOD_UNLOAD: 615 return ef_unload(); 616 default: 617 break; 618 } 619 return 0; 620 } 621 622 static moduledata_t if_ef_mod = { 623 "if_ef", if_ef_modevent, NULL 624 }; 625 626 DECLARE_MODULE(if_ef, if_ef_mod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE);
Cache object: 470f43b9b4df446d8a512a03ae9414c4
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