FreeBSD/Linux Kernel Cross Reference
sys/net/if_ef.c
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 /* If none of the supported layers is enabled explicitly enable them all */
65 #if !defined(ETHER_II) && !defined(ETHER_8023) && !defined(ETHER_8022) && \
66 !defined(ETHER_SNAP)
67 #define ETHER_II 1
68 #define ETHER_8023 1
69 #define ETHER_8022 1
70 #define ETHER_SNAP 1
71 #endif
72
73 /* internal frame types */
74 #define ETHER_FT_EII 0 /* Ethernet_II - default */
75 #define ETHER_FT_8023 1 /* 802.3 (Novell) */
76 #define ETHER_FT_8022 2 /* 802.2 */
77 #define ETHER_FT_SNAP 3 /* SNAP */
78 #define EF_NFT 4 /* total number of frame types */
79
80 #ifdef EF_DEBUG
81 #define EFDEBUG(format, args...) printf("%s: "format, __func__ ,## args)
82 #else
83 #define EFDEBUG(format, args...)
84 #endif
85
86 #define EFERROR(format, args...) printf("%s: "format, __func__ ,## args)
87
88 struct efnet {
89 struct ifnet *ef_ifp;
90 struct ifnet *ef_pifp;
91 int ef_frametype;
92 };
93
94 struct ef_link {
95 SLIST_ENTRY(ef_link) el_next;
96 struct ifnet *el_ifp; /* raw device for this clones */
97 struct efnet *el_units[EF_NFT]; /* our clones */
98 };
99
100 static SLIST_HEAD(ef_link_head, ef_link) efdev = {NULL};
101 static int efcount;
102
103 extern int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
104 extern int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
105 struct sockaddr *dst, short *tp, int *hlen);
106
107 /*
108 static void ef_reset (struct ifnet *);
109 */
110 static int ef_attach(struct efnet *sc);
111 static int ef_detach(struct efnet *sc);
112 static void ef_init(void *);
113 static int ef_ioctl(struct ifnet *, u_long, caddr_t);
114 static void ef_start(struct ifnet *);
115 static int ef_input(struct ifnet*, struct ether_header *, struct mbuf *);
116 static int ef_output(struct ifnet *ifp, struct mbuf **mp,
117 struct sockaddr *dst, short *tp, int *hlen);
118
119 static int ef_load(void);
120 static int ef_unload(void);
121
122 /*
123 * Install the interface, most of structure initialization done in ef_clone()
124 */
125 static int
126 ef_attach(struct efnet *sc)
127 {
128 struct ifnet *ifp = sc->ef_ifp;
129 struct ifaddr *ifa2;
130 struct sockaddr_dl *sdl2;
131
132 ifp->if_start = ef_start;
133 ifp->if_watchdog = NULL;
134 ifp->if_init = ef_init;
135 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
136 ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
137 /*
138 * Attach the interface
139 */
140 ifa2 = ifaddr_byindex(sc->ef_pifp->if_index);
141 sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr;
142 ether_ifattach(ifp, LLADDR(sdl2));
143
144 ifp->if_resolvemulti = 0;
145 ifp->if_type = IFT_XETHER;
146 ifp->if_drv_flags |= IFF_DRV_RUNNING;
147
148 EFDEBUG("%s: attached\n", ifp->if_xname);
149 return 1;
150 }
151
152 /*
153 * This is for _testing_only_, just removes interface from interfaces list
154 */
155 static int
156 ef_detach(struct efnet *sc)
157 {
158 struct ifnet *ifp = sc->ef_ifp;
159 int s;
160
161 s = splimp();
162
163 ether_ifdetach(ifp);
164 if_free(ifp);
165
166 splx(s);
167 return 0;
168 }
169
170 static void
171 ef_init(void *foo) {
172 return;
173 }
174
175 static int
176 ef_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
177 {
178 struct efnet *sc = ifp->if_softc;
179 struct ifaddr *ifa = (struct ifaddr*)data;
180 int s, error;
181
182 EFDEBUG("IOCTL %ld for %s\n", cmd, ifp->if_xname);
183 error = 0;
184 s = splimp();
185 switch (cmd) {
186 case SIOCSIFFLAGS:
187 error = 0;
188 break;
189 case SIOCSIFADDR:
190 if (sc->ef_frametype == ETHER_FT_8023 &&
191 ifa->ifa_addr->sa_family != AF_IPX) {
192 error = EAFNOSUPPORT;
193 break;
194 }
195 ifp->if_flags |= IFF_UP;
196 /* FALL THROUGH */
197 default:
198 error = ether_ioctl(ifp, cmd, data);
199 break;
200 }
201 splx(s);
202 return error;
203 }
204
205 /*
206 * Currently packet prepared in the ether_output(), but this can be a better
207 * place.
208 */
209 static void
210 ef_start(struct ifnet *ifp)
211 {
212 struct efnet *sc = (struct efnet*)ifp->if_softc;
213 struct ifnet *p;
214 struct mbuf *m;
215 int error;
216
217 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
218 p = sc->ef_pifp;
219
220 EFDEBUG("\n");
221 for (;;) {
222 IF_DEQUEUE(&ifp->if_snd, m);
223 if (m == 0)
224 break;
225 BPF_MTAP(ifp, m);
226 IFQ_HANDOFF(p, m, error);
227 if (error) {
228 ifp->if_oerrors++;
229 continue;
230 }
231 ifp->if_opackets++;
232 }
233 ifp->if_drv_flags &= ~IFF_DRV_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, u_short ether_type)
243 {
244 int isr;
245
246 switch(ether_type) {
247 #ifdef IPX
248 case ETHERTYPE_IPX:
249 isr = NETISR_IPX;
250 break;
251 #endif
252 #ifdef INET
253 case ETHERTYPE_IP:
254 if (ip_fastforward(m))
255 return (0);
256 isr = NETISR_IP;
257 break;
258
259 case ETHERTYPE_ARP:
260 isr = NETISR_ARP;
261 break;
262 #endif
263 default:
264 return (EPROTONOSUPPORT);
265 }
266 netisr_dispatch(isr, m);
267 return (0);
268 }
269
270 static int __inline
271 ef_inputSNAP(struct mbuf *m, struct ether_header *eh, struct llc* l,
272 u_short ether_type)
273 {
274 int isr;
275
276 switch(ether_type) {
277 #ifdef IPX
278 case ETHERTYPE_IPX:
279 m_adj(m, 8);
280 isr = NETISR_IPX;
281 break;
282 #endif
283 default:
284 return (EPROTONOSUPPORT);
285 }
286 netisr_dispatch(isr, m);
287 return (0);
288 }
289
290 static int __inline
291 ef_input8022(struct mbuf *m, struct ether_header *eh, struct llc* l,
292 u_short ether_type)
293 {
294 int isr;
295
296 switch(ether_type) {
297 #ifdef IPX
298 case 0xe0:
299 m_adj(m, 3);
300 isr = NETISR_IPX;
301 break;
302 #endif
303 default:
304 return (EPROTONOSUPPORT);
305 }
306 netisr_dispatch(isr, m);
307 return (0);
308 }
309
310 /*
311 * Called from ether_input()
312 */
313 static int
314 ef_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
315 {
316 u_short ether_type;
317 int ft = -1;
318 struct efnet *efp;
319 struct ifnet *eifp;
320 struct llc *l;
321 struct ef_link *efl;
322 int isr;
323
324 ether_type = ntohs(eh->ether_type);
325 l = NULL;
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_ifp;
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 BPF_MTAP2(eifp, eh, ETHER_HDR_LEN, m);
375 /*
376 * Now we ready to adjust mbufs and pass them to protocol intr's
377 */
378 switch(ft) {
379 case ETHER_FT_EII:
380 return (ef_inputEII(m, eh, ether_type));
381 #ifdef IPX
382 case ETHER_FT_8023: /* only IPX can be here */
383 isr = NETISR_IPX;
384 break;
385 #endif
386 case ETHER_FT_SNAP:
387 return (ef_inputSNAP(m, eh, l, ether_type));
388 case ETHER_FT_8022:
389 return (ef_input8022(m, eh, l, ether_type));
390 default:
391 EFDEBUG("No support for frame %d and proto %04x\n",
392 ft, ether_type);
393 return (EPROTONOSUPPORT);
394 }
395 netisr_dispatch(isr, m);
396 return (0);
397 }
398
399 static int
400 ef_output(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, short *tp,
401 int *hlen)
402 {
403 struct efnet *sc = (struct efnet*)ifp->if_softc;
404 struct mbuf *m = *mp;
405 u_char *cp;
406 short type;
407
408 if (ifp->if_type != IFT_XETHER)
409 return ENETDOWN;
410 switch (sc->ef_frametype) {
411 case ETHER_FT_EII:
412 #ifdef IPX
413 type = htons(ETHERTYPE_IPX);
414 #else
415 return EPFNOSUPPORT;
416 #endif
417 break;
418 case ETHER_FT_8023:
419 type = htons(m->m_pkthdr.len);
420 break;
421 case ETHER_FT_8022:
422 M_PREPEND(m, ETHER_HDR_LEN + 3, M_TRYWAIT);
423 if (m == NULL) {
424 *mp = NULL;
425 return ENOBUFS;
426 }
427 /*
428 * Ensure that ethernet header and next three bytes
429 * will fit into single mbuf
430 */
431 m = m_pullup(m, ETHER_HDR_LEN + 3);
432 if (m == NULL) {
433 *mp = NULL;
434 return ENOBUFS;
435 }
436 m_adj(m, ETHER_HDR_LEN);
437 type = htons(m->m_pkthdr.len);
438 cp = mtod(m, u_char *);
439 *cp++ = 0xE0;
440 *cp++ = 0xE0;
441 *cp++ = 0x03;
442 *hlen += 3;
443 break;
444 case ETHER_FT_SNAP:
445 M_PREPEND(m, 8, M_TRYWAIT);
446 if (m == NULL) {
447 *mp = NULL;
448 return ENOBUFS;
449 }
450 type = htons(m->m_pkthdr.len);
451 cp = mtod(m, u_char *);
452 bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8);
453 *hlen += 8;
454 break;
455 default:
456 return EPFNOSUPPORT;
457 }
458 *mp = m;
459 *tp = type;
460 return 0;
461 }
462
463 /*
464 * Create clone from the given interface
465 */
466 static int
467 ef_clone(struct ef_link *efl, int ft)
468 {
469 struct efnet *efp;
470 struct ifnet *eifp;
471 struct ifnet *ifp = efl->el_ifp;
472
473 efp = (struct efnet*)malloc(sizeof(struct efnet), M_IFADDR,
474 M_WAITOK | M_ZERO);
475 if (efp == NULL)
476 return ENOMEM;
477 efp->ef_pifp = ifp;
478 efp->ef_frametype = ft;
479 eifp = efp->ef_ifp = if_alloc(IFT_ETHER);
480 if (eifp == NULL) {
481 free(efp, M_IFADDR);
482 return (ENOSPC);
483 }
484 snprintf(eifp->if_xname, IFNAMSIZ,
485 "%sf%d", ifp->if_xname, efp->ef_frametype);
486 eifp->if_dname = "ef";
487 eifp->if_dunit = IF_DUNIT_NONE;
488 eifp->if_softc = efp;
489 if (ifp->if_ioctl)
490 eifp->if_ioctl = ef_ioctl;
491 efl->el_units[ft] = efp;
492 return 0;
493 }
494
495 static int
496 ef_load(void)
497 {
498 struct ifnet *ifp;
499 struct efnet *efp;
500 struct ef_link *efl = NULL, *efl_temp;
501 int error = 0, d;
502
503 IFNET_RLOCK();
504 TAILQ_FOREACH(ifp, &ifnet, if_link) {
505 if (ifp->if_type != IFT_ETHER) continue;
506 EFDEBUG("Found interface %s\n", ifp->if_xname);
507 efl = (struct ef_link*)malloc(sizeof(struct ef_link),
508 M_IFADDR, M_WAITOK | M_ZERO);
509 if (efl == NULL) {
510 error = ENOMEM;
511 break;
512 }
513
514 efl->el_ifp = ifp;
515 #ifdef ETHER_II
516 error = ef_clone(efl, ETHER_FT_EII);
517 if (error) break;
518 #endif
519 #ifdef ETHER_8023
520 error = ef_clone(efl, ETHER_FT_8023);
521 if (error) break;
522 #endif
523 #ifdef ETHER_8022
524 error = ef_clone(efl, ETHER_FT_8022);
525 if (error) break;
526 #endif
527 #ifdef ETHER_SNAP
528 error = ef_clone(efl, ETHER_FT_SNAP);
529 if (error) break;
530 #endif
531 efcount++;
532 SLIST_INSERT_HEAD(&efdev, efl, el_next);
533 }
534 IFNET_RUNLOCK();
535 if (error) {
536 if (efl)
537 SLIST_INSERT_HEAD(&efdev, efl, el_next);
538 SLIST_FOREACH_SAFE(efl, &efdev, el_next, efl_temp) {
539 for (d = 0; d < EF_NFT; d++)
540 if (efl->el_units[d]) {
541 if (efl->el_units[d]->ef_pifp != NULL)
542 if_free(efl->el_units[d]->ef_pifp);
543 free(efl->el_units[d], M_IFADDR);
544 }
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 return EOPNOTSUPP;
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);
Cache object: f78a4523feb3a96648e85bc981925373
|