xref: /freebsd/sys/net/if_media.c (revision dd41de95a84d979615a2ef11df6850622bf6184e) 
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
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
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
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
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
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
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
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 *
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
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
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