1 /* $NetBSD: if_media.c,v 1.1 1997/03/17 02:55:15 thorpej Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-4-Clause
5 *
6 * Copyright (c) 1997
7 * Jonathan Stone and Jason R. Thorpe. All rights reserved.
8 *
9 * This software is derived from information provided by Matt Thomas.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by Jonathan Stone
22 * and Jason R. Thorpe for the NetBSD Project.
23 * 4. The names of the authors may not be used to endorse or promote products
24 * derived from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
31 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
32 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
33 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
34 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39 /*
40 * BSD/OS-compatible network interface media selection.
41 *
42 * Where it is safe to do so, this code strays slightly from the BSD/OS
43 * design. Software which uses the API (device drivers, basically)
44 * shouldn't notice any difference.
45 *
46 * Many thanks to Matt Thomas for providing the information necessary
47 * to implement this interface.
48 */
49
50 #include <sys/cdefs.h>
51 __FBSDID("$FreeBSD$");
52
53 #include "opt_ifmedia.h"
54
55 #include <sys/param.h>
56 #include <sys/systm.h>
57 #include <sys/socket.h>
58 #include <sys/sockio.h>
59 #include <sys/malloc.h>
60 #include <sys/module.h>
61 #include <sys/sysctl.h>
62
63 #include <net/if.h>
64 #include <net/if_media.h>
65
66 /*
67 * Compile-time options:
68 * IFMEDIA_DEBUG:
69 * turn on implementation-level debug printfs.
70 * Useful for debugging newly-ported drivers.
71 */
72
73 static struct ifmedia_entry *ifmedia_match(struct ifmedia *ifm,
74 int flags, int mask);
75
76 #ifdef IFMEDIA_DEBUG
77 #include <net/if_var.h>
78 int ifmedia_debug = 0;
79 SYSCTL_INT(_debug, OID_AUTO, ifmedia, CTLFLAG_RW, &ifmedia_debug,
80 0, "if_media debugging msgs");
81 static void ifmedia_printword(int);
82 #endif
83
84 /*
85 * Initialize if_media struct for a specific interface instance.
86 */
87 void
ifmedia_init(struct ifmedia * ifm,int dontcare_mask,ifm_change_cb_t change_callback,ifm_stat_cb_t status_callback)88 ifmedia_init(struct ifmedia *ifm, int dontcare_mask,
89 ifm_change_cb_t change_callback, ifm_stat_cb_t status_callback)
90 {
91
92 LIST_INIT(&ifm->ifm_list);
93 ifm->ifm_cur = NULL;
94 ifm->ifm_media = 0;
95 ifm->ifm_mask = dontcare_mask; /* IF don't-care bits */
96 ifm->ifm_change = change_callback;
97 ifm->ifm_status = status_callback;
98 }
99
100 void
ifmedia_removeall(struct ifmedia * ifm)101 ifmedia_removeall(struct ifmedia *ifm)
102 {
103 struct ifmedia_entry *entry;
104
105 while ((entry = LIST_FIRST(&ifm->ifm_list)) != NULL) {
106 LIST_REMOVE(entry, ifm_list);
107 free(entry, M_IFADDR);
108 }
109 ifm->ifm_cur = NULL;
110 }
111
112 /*
113 * Add a media configuration to the list of supported media
114 * for a specific interface instance.
115 */
116 void
ifmedia_add(struct ifmedia * ifm,int mword,int data,void * aux)117 ifmedia_add(struct ifmedia *ifm, int mword, int data, void *aux)
118 {
119 struct ifmedia_entry *entry;
120
121 #ifdef IFMEDIA_DEBUG
122 if (ifmedia_debug) {
123 if (ifm == NULL) {
124 printf("ifmedia_add: null ifm\n");
125 return;
126 }
127 printf("Adding entry for (%#010x) ", mword);
128 ifmedia_printword(mword);
129 }
130 #endif
131
132 entry = malloc(sizeof(*entry), M_IFADDR, M_NOWAIT);
133 if (entry == NULL)
134 panic("ifmedia_add: can't malloc entry");
135
136 entry->ifm_media = mword;
137 entry->ifm_data = data;
138 entry->ifm_aux = aux;
139
140 LIST_INSERT_HEAD(&ifm->ifm_list, entry, ifm_list);
141 }
142
143 /*
144 * Add an array of media configurations to the list of
145 * supported media for a specific interface instance.
146 */
147 void
ifmedia_list_add(struct ifmedia * ifm,struct ifmedia_entry * lp,int count)148 ifmedia_list_add(struct ifmedia *ifm, struct ifmedia_entry *lp, int count)
149 {
150 int i;
151
152 for (i = 0; i < count; i++)
153 ifmedia_add(ifm, lp[i].ifm_media, lp[i].ifm_data,
154 lp[i].ifm_aux);
155 }
156
157 /*
158 * Set the default active media.
159 *
160 * Called by device-specific code which is assumed to have already
161 * selected the default media in hardware. We do _not_ call the
162 * media-change callback.
163 */
164 void
ifmedia_set(struct ifmedia * ifm,int target)165 ifmedia_set(struct ifmedia *ifm, int target)
166 {
167 struct ifmedia_entry *match;
168
169 match = ifmedia_match(ifm, target, ifm->ifm_mask);
170
171 if (match == NULL) {
172 printf("ifmedia_set: no match for 0x%x/0x%x\n",
173 target, ~ifm->ifm_mask);
174 panic("ifmedia_set");
175 }
176 ifm->ifm_cur = match;
177
178 #ifdef IFMEDIA_DEBUG
179 if (ifmedia_debug) {
180 printf("ifmedia_set: target ");
181 ifmedia_printword(target);
182 printf("ifmedia_set: setting to ");
183 ifmedia_printword(ifm->ifm_cur->ifm_media);
184 }
185 #endif
186 }
187
188 /*
189 * Given a media word, return one suitable for an application
190 * using the original encoding.
191 */
192 static int
compat_media(int media)193 compat_media(int media)
194 {
195
196 if (IFM_TYPE(media) == IFM_ETHER && IFM_SUBTYPE(media) > IFM_OTHER) {
197 media &= ~(IFM_ETH_XTYPE|IFM_TMASK);
198 media |= IFM_OTHER;
199 }
200 return (media);
201 }
202
203 /*
204 * Device-independent media ioctl support function.
205 */
206 int
ifmedia_ioctl(struct ifnet * ifp,struct ifreq * ifr,struct ifmedia * ifm,u_long cmd)207 ifmedia_ioctl(struct ifnet *ifp, struct ifreq *ifr, struct ifmedia *ifm,
208 u_long cmd)
209 {
210 struct ifmedia_entry *match;
211 struct ifmediareq *ifmr = (struct ifmediareq *) ifr;
212 int error = 0;
213
214 if (ifp == NULL || ifr == NULL || ifm == NULL)
215 return (EINVAL);
216
217 switch (cmd) {
218 /*
219 * Set the current media.
220 */
221 case SIOCSIFMEDIA:
222 {
223 struct ifmedia_entry *oldentry;
224 int oldmedia;
225 int newmedia = ifr->ifr_media;
226
227 match = ifmedia_match(ifm, newmedia, ifm->ifm_mask);
228 if (match == NULL) {
229 #ifdef IFMEDIA_DEBUG
230 if (ifmedia_debug) {
231 printf(
232 "ifmedia_ioctl: no media found for %#010x mask %#010x\n",
233 newmedia, ifm->ifm_mask);
234 }
235 #endif
236 return (ENXIO);
237 }
238
239 /*
240 * If no change, we're done.
241 * XXX Automedia may invole software intervention.
242 * Keep going in case the connected media changed.
243 * Similarly, if best match changed (kernel debugger?).
244 */
245 if (IFM_SUBTYPE(newmedia) != IFM_AUTO &&
246 newmedia == ifm->ifm_media && match == ifm->ifm_cur)
247 return (0);
248
249 /*
250 * We found a match, now make the driver switch to it.
251 * Make sure to preserve our old media type in case the
252 * driver can't switch.
253 */
254 #ifdef IFMEDIA_DEBUG
255 if (ifmedia_debug) {
256 printf("ifmedia_ioctl: switching %s to ",
257 ifp->if_xname);
258 ifmedia_printword(match->ifm_media);
259 }
260 #endif
261 oldentry = ifm->ifm_cur;
262 oldmedia = ifm->ifm_media;
263 ifm->ifm_cur = match;
264 ifm->ifm_media = newmedia;
265 error = (*ifm->ifm_change)(ifp);
266 if (error) {
267 ifm->ifm_cur = oldentry;
268 ifm->ifm_media = oldmedia;
269 }
270 break;
271 }
272
273 /*
274 * Get list of available media and current media on interface.
275 */
276 case SIOCGIFMEDIA:
277 case SIOCGIFXMEDIA:
278 {
279 struct ifmedia_entry *ep;
280 int i;
281
282 if (ifmr->ifm_count < 0)
283 return (EINVAL);
284
285 if (cmd == SIOCGIFMEDIA) {
286 ifmr->ifm_active = ifmr->ifm_current = ifm->ifm_cur ?
287 compat_media(ifm->ifm_cur->ifm_media) : IFM_NONE;
288 } else {
289 ifmr->ifm_active = ifmr->ifm_current = ifm->ifm_cur ?
290 ifm->ifm_cur->ifm_media : IFM_NONE;
291 }
292 ifmr->ifm_mask = ifm->ifm_mask;
293 ifmr->ifm_status = 0;
294 (*ifm->ifm_status)(ifp, ifmr);
295
296 /*
297 * If there are more interfaces on the list, count
298 * them. This allows the caller to set ifmr->ifm_count
299 * to 0 on the first call to know how much space to
300 * allocate.
301 */
302 i = 0;
303 LIST_FOREACH(ep, &ifm->ifm_list, ifm_list) {
304 if (i < ifmr->ifm_count) {
305 error = copyout(&ep->ifm_media,
306 ifmr->ifm_ulist + i, sizeof(int));
307 if (error != 0)
308 break;
309 }
310 i++;
311 }
312 if (error == 0 && i > ifmr->ifm_count)
313 error = ifmr->ifm_count != 0 ? E2BIG : 0;
314 ifmr->ifm_count = i;
315 break;
316 }
317
318 default:
319 return (EINVAL);
320 }
321
322 return (error);
323 }
324
325 /*
326 * Find media entry matching a given ifm word.
327 *
328 */
329 static struct ifmedia_entry *
ifmedia_match(struct ifmedia * ifm,int target,int mask)330 ifmedia_match(struct ifmedia *ifm, int target, int mask)
331 {
332 struct ifmedia_entry *match, *next;
333
334 match = NULL;
335 mask = ~mask;
336
337 LIST_FOREACH(next, &ifm->ifm_list, ifm_list) {
338 if ((next->ifm_media & mask) == (target & mask)) {
339 #if defined(IFMEDIA_DEBUG) || defined(DIAGNOSTIC)
340 if (match) {
341 printf("ifmedia_match: multiple match for "
342 "%#010x/%#010x\n", target, mask);
343 }
344 #endif
345 match = next;
346 }
347 }
348
349 return (match);
350 }
351
352 /*
353 * Compute the interface `baudrate' from the media, for the interface
354 * metrics (used by routing daemons).
355 */
356 static const struct ifmedia_baudrate ifmedia_baudrate_descriptions[] =
357 IFM_BAUDRATE_DESCRIPTIONS;
358
359 uint64_t
ifmedia_baudrate(int mword)360 ifmedia_baudrate(int mword)
361 {
362 int i;
363
364 for (i = 0; ifmedia_baudrate_descriptions[i].ifmb_word != 0; i++) {
365 if (IFM_TYPE_MATCH(mword, ifmedia_baudrate_descriptions[i].
366 ifmb_word))
367 return (ifmedia_baudrate_descriptions[i].ifmb_baudrate);
368 }
369
370 /* Not known. */
371 return (0);
372 }
373
374 #ifdef IFMEDIA_DEBUG
375 static const struct ifmedia_description ifm_type_descriptions[] =
376 IFM_TYPE_DESCRIPTIONS;
377
378 static const struct ifmedia_description ifm_subtype_ethernet_descriptions[] =
379 IFM_SUBTYPE_ETHERNET_DESCRIPTIONS;
380
381 static const struct ifmedia_description
382 ifm_subtype_ethernet_option_descriptions[] =
383 IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS;
384
385 static const struct ifmedia_description ifm_subtype_ieee80211_descriptions[] =
386 IFM_SUBTYPE_IEEE80211_DESCRIPTIONS;
387
388 static const struct ifmedia_description
389 ifm_subtype_ieee80211_option_descriptions[] =
390 IFM_SUBTYPE_IEEE80211_OPTION_DESCRIPTIONS;
391
392 static const struct ifmedia_description
393 ifm_subtype_ieee80211_mode_descriptions[] =
394 IFM_SUBTYPE_IEEE80211_MODE_DESCRIPTIONS;
395
396 static const struct ifmedia_description ifm_subtype_atm_descriptions[] =
397 IFM_SUBTYPE_ATM_DESCRIPTIONS;
398
399 static const struct ifmedia_description ifm_subtype_atm_option_descriptions[] =
400 IFM_SUBTYPE_ATM_OPTION_DESCRIPTIONS;
401
402 static const struct ifmedia_description ifm_subtype_shared_descriptions[] =
403 IFM_SUBTYPE_SHARED_DESCRIPTIONS;
404
405 static const struct ifmedia_description ifm_shared_option_descriptions[] =
406 IFM_SHARED_OPTION_DESCRIPTIONS;
407
408 struct ifmedia_type_to_subtype {
409 const struct ifmedia_description *subtypes;
410 const struct ifmedia_description *options;
411 const struct ifmedia_description *modes;
412 };
413
414 /* must be in the same order as IFM_TYPE_DESCRIPTIONS */
415 static const struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = {
416 {
417 &ifm_subtype_ethernet_descriptions[0],
418 &ifm_subtype_ethernet_option_descriptions[0],
419 NULL,
420 },
421 {
422 &ifm_subtype_ieee80211_descriptions[0],
423 &ifm_subtype_ieee80211_option_descriptions[0],
424 &ifm_subtype_ieee80211_mode_descriptions[0]
425 },
426 {
427 &ifm_subtype_atm_descriptions[0],
428 &ifm_subtype_atm_option_descriptions[0],
429 NULL,
430 },
431 };
432
433 /*
434 * print a media word.
435 */
436 static void
ifmedia_printword(int ifmw)437 ifmedia_printword(int ifmw)
438 {
439 const struct ifmedia_description *desc;
440 const struct ifmedia_type_to_subtype *ttos;
441 int seen_option = 0;
442
443 /* Find the top-level interface type. */
444 for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
445 desc->ifmt_string != NULL; desc++, ttos++)
446 if (IFM_TYPE(ifmw) == desc->ifmt_word)
447 break;
448 if (desc->ifmt_string == NULL) {
449 printf("<unknown type>\n");
450 return;
451 }
452 printf("%s", desc->ifmt_string);
453
454 /* Any mode. */
455 for (desc = ttos->modes; desc && desc->ifmt_string != NULL; desc++)
456 if (IFM_MODE(ifmw) == desc->ifmt_word) {
457 if (desc->ifmt_string != NULL)
458 printf(" mode %s", desc->ifmt_string);
459 break;
460 }
461
462 /*
463 * Check for the shared subtype descriptions first, then the
464 * type-specific ones.
465 */
466 for (desc = ifm_subtype_shared_descriptions;
467 desc->ifmt_string != NULL; desc++)
468 if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
469 goto got_subtype;
470
471 for (desc = ttos->subtypes; desc->ifmt_string != NULL; desc++)
472 if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
473 break;
474 if (desc->ifmt_string == NULL) {
475 printf(" <unknown subtype>\n");
476 return;
477 }
478
479 got_subtype:
480 printf(" %s", desc->ifmt_string);
481
482 /*
483 * Look for shared options.
484 */
485 for (desc = ifm_shared_option_descriptions;
486 desc->ifmt_string != NULL; desc++) {
487 if (ifmw & desc->ifmt_word) {
488 if (seen_option == 0)
489 printf(" <");
490 printf("%s%s", seen_option++ ? "," : "",
491 desc->ifmt_string);
492 }
493 }
494
495 /*
496 * Look for subtype-specific options.
497 */
498 for (desc = ttos->options; desc->ifmt_string != NULL; desc++) {
499 if (ifmw & desc->ifmt_word) {
500 if (seen_option == 0)
501 printf(" <");
502 printf("%s%s", seen_option++ ? "," : "",
503 desc->ifmt_string);
504 }
505 }
506 printf("%s\n", seen_option ? ">" : "");
507 }
508 #endif /* IFMEDIA_DEBUG */
509