xref: /freebsd/sbin/ifconfig/ifmedia.c (revision 0957b409)
1 /*	$NetBSD: ifconfig.c,v 1.34 1997/04/21 01:17:58 lukem Exp $	*/
2 /* $FreeBSD$ */
3 
4 /*-
5  * SPDX-License-Identifier: BSD-4-Clause
6  *
7  * Copyright (c) 1997 Jason R. Thorpe.
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *      This product includes software developed for the NetBSD Project
21  *	by Jason R. Thorpe.
22  * 4. The name of the author may not be used to endorse or promote products
23  *    derived from this software without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
30  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
31  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
32  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
33  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  */
37 
38 /*
39  * Copyright (c) 1983, 1993
40  *	The Regents of the University of California.  All rights reserved.
41  *
42  * Redistribution and use in source and binary forms, with or without
43  * modification, are permitted provided that the following conditions
44  * are met:
45  * 1. Redistributions of source code must retain the above copyright
46  *    notice, this list of conditions and the following disclaimer.
47  * 2. Redistributions in binary form must reproduce the above copyright
48  *    notice, this list of conditions and the following disclaimer in the
49  *    documentation and/or other materials provided with the distribution.
50  * 4. Neither the name of the University nor the names of its contributors
51  *    may be used to endorse or promote products derived from this software
52  *    without specific prior written permission.
53  *
54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64  * SUCH DAMAGE.
65  */
66 
67 #include <sys/param.h>
68 #include <sys/ioctl.h>
69 #include <sys/socket.h>
70 #include <sys/sysctl.h>
71 #include <sys/time.h>
72 
73 #include <net/if.h>
74 #include <net/if_dl.h>
75 #include <net/if_types.h>
76 #include <net/if_media.h>
77 #include <net/route.h>
78 
79 #include <ctype.h>
80 #include <err.h>
81 #include <errno.h>
82 #include <fcntl.h>
83 #include <stdio.h>
84 #include <stdlib.h>
85 #include <string.h>
86 #include <unistd.h>
87 
88 #include "ifconfig.h"
89 
90 static void	domediaopt(const char *, int, int);
91 static int	get_media_subtype(int, const char *);
92 static int	get_media_mode(int, const char *);
93 static int	get_media_options(int, const char *);
94 static int	lookup_media_word(struct ifmedia_description *, const char *);
95 static void	print_media_word(int, int);
96 static void	print_media_word_ifconfig(int);
97 
98 static struct ifmedia_description *get_toptype_desc(int);
99 static struct ifmedia_type_to_subtype *get_toptype_ttos(int);
100 static struct ifmedia_description *get_subtype_desc(int,
101     struct ifmedia_type_to_subtype *ttos);
102 
103 #define	IFM_OPMODE(x) \
104 	((x) & (IFM_IEEE80211_ADHOC | IFM_IEEE80211_HOSTAP | \
105 	 IFM_IEEE80211_IBSS | IFM_IEEE80211_WDS | IFM_IEEE80211_MONITOR | \
106 	 IFM_IEEE80211_MBSS))
107 #define	IFM_IEEE80211_STA	0
108 
109 static void
110 media_status(int s)
111 {
112 	struct ifmediareq ifmr;
113 	int *media_list, i;
114 	int xmedia = 1;
115 
116 	(void) memset(&ifmr, 0, sizeof(ifmr));
117 	(void) strlcpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));
118 
119 	/*
120 	 * Check if interface supports extended media types.
121 	 */
122 	if (ioctl(s, SIOCGIFXMEDIA, (caddr_t)&ifmr) < 0)
123 		xmedia = 0;
124 	if (xmedia == 0 && ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
125 		/*
126 		 * Interface doesn't support SIOC{G,S}IFMEDIA.
127 		 */
128 		return;
129 	}
130 
131 	if (ifmr.ifm_count == 0) {
132 		warnx("%s: no media types?", name);
133 		return;
134 	}
135 
136 	media_list = (int *)malloc(ifmr.ifm_count * sizeof(int));
137 	if (media_list == NULL)
138 		err(1, "malloc");
139 	ifmr.ifm_ulist = media_list;
140 
141 	if (xmedia) {
142 		if (ioctl(s, SIOCGIFXMEDIA, (caddr_t)&ifmr) < 0)
143 			err(1, "SIOCGIFXMEDIA");
144 	} else {
145 		if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0)
146 			err(1, "SIOCGIFMEDIA");
147 	}
148 
149 	printf("\tmedia: ");
150 	print_media_word(ifmr.ifm_current, 1);
151 	if (ifmr.ifm_active != ifmr.ifm_current) {
152 		putchar(' ');
153 		putchar('(');
154 		print_media_word(ifmr.ifm_active, 0);
155 		putchar(')');
156 	}
157 
158 	putchar('\n');
159 
160 	if (ifmr.ifm_status & IFM_AVALID) {
161 		printf("\tstatus: ");
162 		switch (IFM_TYPE(ifmr.ifm_active)) {
163 		case IFM_ETHER:
164 		case IFM_ATM:
165 			if (ifmr.ifm_status & IFM_ACTIVE)
166 				printf("active");
167 			else
168 				printf("no carrier");
169 			break;
170 
171 		case IFM_IEEE80211:
172 			if (ifmr.ifm_status & IFM_ACTIVE) {
173 				/* NB: only sta mode associates */
174 				if (IFM_OPMODE(ifmr.ifm_active) == IFM_IEEE80211_STA)
175 					printf("associated");
176 				else
177 					printf("running");
178 			} else
179 				printf("no carrier");
180 			break;
181 		}
182 		putchar('\n');
183 	}
184 
185 	if (ifmr.ifm_count > 0 && supmedia) {
186 		printf("\tsupported media:\n");
187 		for (i = 0; i < ifmr.ifm_count; i++) {
188 			printf("\t\t");
189 			print_media_word_ifconfig(media_list[i]);
190 			putchar('\n');
191 		}
192 	}
193 
194 	free(media_list);
195 }
196 
197 struct ifmediareq *
198 ifmedia_getstate(int s)
199 {
200 	static struct ifmediareq *ifmr = NULL;
201 	int *mwords;
202 	int xmedia = 1;
203 
204 	if (ifmr == NULL) {
205 		ifmr = (struct ifmediareq *)malloc(sizeof(struct ifmediareq));
206 		if (ifmr == NULL)
207 			err(1, "malloc");
208 
209 		(void) memset(ifmr, 0, sizeof(struct ifmediareq));
210 		(void) strlcpy(ifmr->ifm_name, name,
211 		    sizeof(ifmr->ifm_name));
212 
213 		ifmr->ifm_count = 0;
214 		ifmr->ifm_ulist = NULL;
215 
216 		/*
217 		 * We must go through the motions of reading all
218 		 * supported media because we need to know both
219 		 * the current media type and the top-level type.
220 		 */
221 
222 		if (ioctl(s, SIOCGIFXMEDIA, (caddr_t)ifmr) < 0) {
223 			xmedia = 0;
224 		}
225 		if (xmedia == 0 && ioctl(s, SIOCGIFMEDIA, (caddr_t)ifmr) < 0) {
226 			err(1, "SIOCGIFMEDIA");
227 		}
228 
229 		if (ifmr->ifm_count == 0)
230 			errx(1, "%s: no media types?", name);
231 
232 		mwords = (int *)malloc(ifmr->ifm_count * sizeof(int));
233 		if (mwords == NULL)
234 			err(1, "malloc");
235 
236 		ifmr->ifm_ulist = mwords;
237 		if (xmedia) {
238 			if (ioctl(s, SIOCGIFXMEDIA, (caddr_t)ifmr) < 0)
239 				err(1, "SIOCGIFXMEDIA");
240 		} else {
241 			if (ioctl(s, SIOCGIFMEDIA, (caddr_t)ifmr) < 0)
242 				err(1, "SIOCGIFMEDIA");
243 		}
244 	}
245 
246 	return ifmr;
247 }
248 
249 static void
250 setifmediacallback(int s, void *arg)
251 {
252 	struct ifmediareq *ifmr = (struct ifmediareq *)arg;
253 	static int did_it = 0;
254 
255 	if (!did_it) {
256 		ifr.ifr_media = ifmr->ifm_current;
257 		if (ioctl(s, SIOCSIFMEDIA, (caddr_t)&ifr) < 0)
258 			err(1, "SIOCSIFMEDIA (media)");
259 		free(ifmr->ifm_ulist);
260 		free(ifmr);
261 		did_it = 1;
262 	}
263 }
264 
265 static void
266 setmedia(const char *val, int d, int s, const struct afswtch *afp)
267 {
268 	struct ifmediareq *ifmr;
269 	int subtype;
270 
271 	ifmr = ifmedia_getstate(s);
272 
273 	/*
274 	 * We are primarily concerned with the top-level type.
275 	 * However, "current" may be only IFM_NONE, so we just look
276 	 * for the top-level type in the first "supported type"
277 	 * entry.
278 	 *
279 	 * (I'm assuming that all supported media types for a given
280 	 * interface will be the same top-level type..)
281 	 */
282 	subtype = get_media_subtype(IFM_TYPE(ifmr->ifm_ulist[0]), val);
283 
284 	strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
285 	ifr.ifr_media = (ifmr->ifm_current & IFM_IMASK) |
286 	    IFM_TYPE(ifmr->ifm_ulist[0]) | subtype;
287 
288 	ifmr->ifm_current = ifr.ifr_media;
289 	callback_register(setifmediacallback, (void *)ifmr);
290 }
291 
292 static void
293 setmediaopt(const char *val, int d, int s, const struct afswtch *afp)
294 {
295 
296 	domediaopt(val, 0, s);
297 }
298 
299 static void
300 unsetmediaopt(const char *val, int d, int s, const struct afswtch *afp)
301 {
302 
303 	domediaopt(val, 1, s);
304 }
305 
306 static void
307 domediaopt(const char *val, int clear, int s)
308 {
309 	struct ifmediareq *ifmr;
310 	int options;
311 
312 	ifmr = ifmedia_getstate(s);
313 
314 	options = get_media_options(IFM_TYPE(ifmr->ifm_ulist[0]), val);
315 
316 	strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
317 	ifr.ifr_media = ifmr->ifm_current;
318 	if (clear)
319 		ifr.ifr_media &= ~options;
320 	else {
321 		if (options & IFM_HDX) {
322 			ifr.ifr_media &= ~IFM_FDX;
323 			options &= ~IFM_HDX;
324 		}
325 		ifr.ifr_media |= options;
326 	}
327 	ifmr->ifm_current = ifr.ifr_media;
328 	callback_register(setifmediacallback, (void *)ifmr);
329 }
330 
331 static void
332 setmediainst(const char *val, int d, int s, const struct afswtch *afp)
333 {
334 	struct ifmediareq *ifmr;
335 	int inst;
336 
337 	ifmr = ifmedia_getstate(s);
338 
339 	inst = atoi(val);
340 	if (inst < 0 || inst > (int)IFM_INST_MAX)
341 		errx(1, "invalid media instance: %s", val);
342 
343 	strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
344 	ifr.ifr_media = (ifmr->ifm_current & ~IFM_IMASK) | inst << IFM_ISHIFT;
345 
346 	ifmr->ifm_current = ifr.ifr_media;
347 	callback_register(setifmediacallback, (void *)ifmr);
348 }
349 
350 static void
351 setmediamode(const char *val, int d, int s, const struct afswtch *afp)
352 {
353 	struct ifmediareq *ifmr;
354 	int mode;
355 
356 	ifmr = ifmedia_getstate(s);
357 
358 	mode = get_media_mode(IFM_TYPE(ifmr->ifm_ulist[0]), val);
359 
360 	strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
361 	ifr.ifr_media = (ifmr->ifm_current & ~IFM_MMASK) | mode;
362 
363 	ifmr->ifm_current = ifr.ifr_media;
364 	callback_register(setifmediacallback, (void *)ifmr);
365 }
366 
367 /**********************************************************************
368  * A good chunk of this is duplicated from sys/net/if_media.c
369  **********************************************************************/
370 
371 static struct ifmedia_description ifm_type_descriptions[] =
372     IFM_TYPE_DESCRIPTIONS;
373 
374 static struct ifmedia_description ifm_subtype_ethernet_descriptions[] =
375     IFM_SUBTYPE_ETHERNET_DESCRIPTIONS;
376 
377 static struct ifmedia_description ifm_subtype_ethernet_aliases[] =
378     IFM_SUBTYPE_ETHERNET_ALIASES;
379 
380 static struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] =
381     IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS;
382 
383 static struct ifmedia_description ifm_subtype_ieee80211_descriptions[] =
384     IFM_SUBTYPE_IEEE80211_DESCRIPTIONS;
385 
386 static struct ifmedia_description ifm_subtype_ieee80211_aliases[] =
387     IFM_SUBTYPE_IEEE80211_ALIASES;
388 
389 static struct ifmedia_description ifm_subtype_ieee80211_option_descriptions[] =
390     IFM_SUBTYPE_IEEE80211_OPTION_DESCRIPTIONS;
391 
392 struct ifmedia_description ifm_subtype_ieee80211_mode_descriptions[] =
393     IFM_SUBTYPE_IEEE80211_MODE_DESCRIPTIONS;
394 
395 struct ifmedia_description ifm_subtype_ieee80211_mode_aliases[] =
396     IFM_SUBTYPE_IEEE80211_MODE_ALIASES;
397 
398 static struct ifmedia_description ifm_subtype_atm_descriptions[] =
399     IFM_SUBTYPE_ATM_DESCRIPTIONS;
400 
401 static struct ifmedia_description ifm_subtype_atm_aliases[] =
402     IFM_SUBTYPE_ATM_ALIASES;
403 
404 static struct ifmedia_description ifm_subtype_atm_option_descriptions[] =
405     IFM_SUBTYPE_ATM_OPTION_DESCRIPTIONS;
406 
407 static struct ifmedia_description ifm_subtype_shared_descriptions[] =
408     IFM_SUBTYPE_SHARED_DESCRIPTIONS;
409 
410 static struct ifmedia_description ifm_subtype_shared_aliases[] =
411     IFM_SUBTYPE_SHARED_ALIASES;
412 
413 static struct ifmedia_description ifm_shared_option_descriptions[] =
414     IFM_SHARED_OPTION_DESCRIPTIONS;
415 
416 static struct ifmedia_description ifm_shared_option_aliases[] =
417     IFM_SHARED_OPTION_ALIASES;
418 
419 struct ifmedia_type_to_subtype {
420 	struct {
421 		struct ifmedia_description *desc;
422 		int alias;
423 	} subtypes[5];
424 	struct {
425 		struct ifmedia_description *desc;
426 		int alias;
427 	} options[4];
428 	struct {
429 		struct ifmedia_description *desc;
430 		int alias;
431 	} modes[3];
432 };
433 
434 /* must be in the same order as IFM_TYPE_DESCRIPTIONS */
435 static struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = {
436 	{
437 		{
438 			{ &ifm_subtype_shared_descriptions[0], 0 },
439 			{ &ifm_subtype_shared_aliases[0], 1 },
440 			{ &ifm_subtype_ethernet_descriptions[0], 0 },
441 			{ &ifm_subtype_ethernet_aliases[0], 1 },
442 			{ NULL, 0 },
443 		},
444 		{
445 			{ &ifm_shared_option_descriptions[0], 0 },
446 			{ &ifm_shared_option_aliases[0], 1 },
447 			{ &ifm_subtype_ethernet_option_descriptions[0], 0 },
448 			{ NULL, 0 },
449 		},
450 		{
451 			{ NULL, 0 },
452 		},
453 	},
454 	{
455 		{
456 			{ &ifm_subtype_shared_descriptions[0], 0 },
457 			{ &ifm_subtype_shared_aliases[0], 1 },
458 			{ &ifm_subtype_ieee80211_descriptions[0], 0 },
459 			{ &ifm_subtype_ieee80211_aliases[0], 1 },
460 			{ NULL, 0 },
461 		},
462 		{
463 			{ &ifm_shared_option_descriptions[0], 0 },
464 			{ &ifm_shared_option_aliases[0], 1 },
465 			{ &ifm_subtype_ieee80211_option_descriptions[0], 0 },
466 			{ NULL, 0 },
467 		},
468 		{
469 			{ &ifm_subtype_ieee80211_mode_descriptions[0], 0 },
470 			{ &ifm_subtype_ieee80211_mode_aliases[0], 0 },
471 			{ NULL, 0 },
472 		},
473 	},
474 	{
475 		{
476 			{ &ifm_subtype_shared_descriptions[0], 0 },
477 			{ &ifm_subtype_shared_aliases[0], 1 },
478 			{ &ifm_subtype_atm_descriptions[0], 0 },
479 			{ &ifm_subtype_atm_aliases[0], 1 },
480 			{ NULL, 0 },
481 		},
482 		{
483 			{ &ifm_shared_option_descriptions[0], 0 },
484 			{ &ifm_shared_option_aliases[0], 1 },
485 			{ &ifm_subtype_atm_option_descriptions[0], 0 },
486 			{ NULL, 0 },
487 		},
488 		{
489 			{ NULL, 0 },
490 		},
491 	},
492 };
493 
494 static int
495 get_media_subtype(int type, const char *val)
496 {
497 	struct ifmedia_description *desc;
498 	struct ifmedia_type_to_subtype *ttos;
499 	int rval, i;
500 
501 	/* Find the top-level interface type. */
502 	for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
503 	    desc->ifmt_string != NULL; desc++, ttos++)
504 		if (type == desc->ifmt_word)
505 			break;
506 	if (desc->ifmt_string == NULL)
507 		errx(1, "unknown media type 0x%x", type);
508 
509 	for (i = 0; ttos->subtypes[i].desc != NULL; i++) {
510 		rval = lookup_media_word(ttos->subtypes[i].desc, val);
511 		if (rval != -1)
512 			return (rval);
513 	}
514 	errx(1, "unknown media subtype: %s", val);
515 	/*NOTREACHED*/
516 }
517 
518 static int
519 get_media_mode(int type, const char *val)
520 {
521 	struct ifmedia_description *desc;
522 	struct ifmedia_type_to_subtype *ttos;
523 	int rval, i;
524 
525 	/* Find the top-level interface type. */
526 	for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
527 	    desc->ifmt_string != NULL; desc++, ttos++)
528 		if (type == desc->ifmt_word)
529 			break;
530 	if (desc->ifmt_string == NULL)
531 		errx(1, "unknown media mode 0x%x", type);
532 
533 	for (i = 0; ttos->modes[i].desc != NULL; i++) {
534 		rval = lookup_media_word(ttos->modes[i].desc, val);
535 		if (rval != -1)
536 			return (rval);
537 	}
538 	return -1;
539 }
540 
541 static int
542 get_media_options(int type, const char *val)
543 {
544 	struct ifmedia_description *desc;
545 	struct ifmedia_type_to_subtype *ttos;
546 	char *optlist, *optptr;
547 	int option = 0, i, rval = 0;
548 
549 	/* We muck with the string, so copy it. */
550 	optlist = strdup(val);
551 	if (optlist == NULL)
552 		err(1, "strdup");
553 
554 	/* Find the top-level interface type. */
555 	for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
556 	    desc->ifmt_string != NULL; desc++, ttos++)
557 		if (type == desc->ifmt_word)
558 			break;
559 	if (desc->ifmt_string == NULL)
560 		errx(1, "unknown media type 0x%x", type);
561 
562 	/*
563 	 * Look up the options in the user-provided comma-separated
564 	 * list.
565 	 */
566 	optptr = optlist;
567 	for (; (optptr = strtok(optptr, ",")) != NULL; optptr = NULL) {
568 		for (i = 0; ttos->options[i].desc != NULL; i++) {
569 			option = lookup_media_word(ttos->options[i].desc, optptr);
570 			if (option != -1)
571 				break;
572 		}
573 		if (option == 0)
574 			errx(1, "unknown option: %s", optptr);
575 		rval |= option;
576 	}
577 
578 	free(optlist);
579 	return (rval);
580 }
581 
582 static int
583 lookup_media_word(struct ifmedia_description *desc, const char *val)
584 {
585 
586 	for (; desc->ifmt_string != NULL; desc++)
587 		if (strcasecmp(desc->ifmt_string, val) == 0)
588 			return (desc->ifmt_word);
589 
590 	return (-1);
591 }
592 
593 static struct ifmedia_description *get_toptype_desc(int ifmw)
594 {
595 	struct ifmedia_description *desc;
596 
597 	for (desc = ifm_type_descriptions; desc->ifmt_string != NULL; desc++)
598 		if (IFM_TYPE(ifmw) == desc->ifmt_word)
599 			break;
600 
601 	return desc;
602 }
603 
604 static struct ifmedia_type_to_subtype *get_toptype_ttos(int ifmw)
605 {
606 	struct ifmedia_description *desc;
607 	struct ifmedia_type_to_subtype *ttos;
608 
609 	for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
610 	    desc->ifmt_string != NULL; desc++, ttos++)
611 		if (IFM_TYPE(ifmw) == desc->ifmt_word)
612 			break;
613 
614 	return ttos;
615 }
616 
617 static struct ifmedia_description *get_subtype_desc(int ifmw,
618     struct ifmedia_type_to_subtype *ttos)
619 {
620 	int i;
621 	struct ifmedia_description *desc;
622 
623 	for (i = 0; ttos->subtypes[i].desc != NULL; i++) {
624 		if (ttos->subtypes[i].alias)
625 			continue;
626 		for (desc = ttos->subtypes[i].desc;
627 		    desc->ifmt_string != NULL; desc++) {
628 			if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
629 				return desc;
630 		}
631 	}
632 
633 	return NULL;
634 }
635 
636 static struct ifmedia_description *get_mode_desc(int ifmw,
637     struct ifmedia_type_to_subtype *ttos)
638 {
639 	int i;
640 	struct ifmedia_description *desc;
641 
642 	for (i = 0; ttos->modes[i].desc != NULL; i++) {
643 		if (ttos->modes[i].alias)
644 			continue;
645 		for (desc = ttos->modes[i].desc;
646 		    desc->ifmt_string != NULL; desc++) {
647 			if (IFM_MODE(ifmw) == desc->ifmt_word)
648 				return desc;
649 		}
650 	}
651 
652 	return NULL;
653 }
654 
655 static void
656 print_media_word(int ifmw, int print_toptype)
657 {
658 	struct ifmedia_description *desc;
659 	struct ifmedia_type_to_subtype *ttos;
660 	int seen_option = 0, i;
661 
662 	/* Find the top-level interface type. */
663 	desc = get_toptype_desc(ifmw);
664 	ttos = get_toptype_ttos(ifmw);
665 	if (desc->ifmt_string == NULL) {
666 		printf("<unknown type>");
667 		return;
668 	} else if (print_toptype) {
669 		printf("%s", desc->ifmt_string);
670 	}
671 
672 	/*
673 	 * Don't print the top-level type; it's not like we can
674 	 * change it, or anything.
675 	 */
676 
677 	/* Find subtype. */
678 	desc = get_subtype_desc(ifmw, ttos);
679 	if (desc == NULL) {
680 		printf("<unknown subtype>");
681 		return;
682 	}
683 
684 	if (print_toptype)
685 		putchar(' ');
686 
687 	printf("%s", desc->ifmt_string);
688 
689 	if (print_toptype) {
690 		desc = get_mode_desc(ifmw, ttos);
691 		if (desc != NULL && strcasecmp("autoselect", desc->ifmt_string))
692 			printf(" mode %s", desc->ifmt_string);
693 	}
694 
695 	/* Find options. */
696 	for (i = 0; ttos->options[i].desc != NULL; i++) {
697 		if (ttos->options[i].alias)
698 			continue;
699 		for (desc = ttos->options[i].desc;
700 		    desc->ifmt_string != NULL; desc++) {
701 			if (ifmw & desc->ifmt_word) {
702 				if (seen_option == 0)
703 					printf(" <");
704 				printf("%s%s", seen_option++ ? "," : "",
705 				    desc->ifmt_string);
706 			}
707 		}
708 	}
709 	printf("%s", seen_option ? ">" : "");
710 
711 	if (print_toptype && IFM_INST(ifmw) != 0)
712 		printf(" instance %d", IFM_INST(ifmw));
713 }
714 
715 static void
716 print_media_word_ifconfig(int ifmw)
717 {
718 	struct ifmedia_description *desc;
719 	struct ifmedia_type_to_subtype *ttos;
720 	int seen_option = 0, i;
721 
722 	/* Find the top-level interface type. */
723 	desc = get_toptype_desc(ifmw);
724 	ttos = get_toptype_ttos(ifmw);
725 	if (desc->ifmt_string == NULL) {
726 		printf("<unknown type>");
727 		return;
728 	}
729 
730 	/*
731 	 * Don't print the top-level type; it's not like we can
732 	 * change it, or anything.
733 	 */
734 
735 	/* Find subtype. */
736 	desc = get_subtype_desc(ifmw, ttos);
737 	if (desc == NULL) {
738 		printf("<unknown subtype>");
739 		return;
740 	}
741 
742 	printf("media %s", desc->ifmt_string);
743 
744 	desc = get_mode_desc(ifmw, ttos);
745 	if (desc != NULL)
746 		printf(" mode %s", desc->ifmt_string);
747 
748 	/* Find options. */
749 	for (i = 0; ttos->options[i].desc != NULL; i++) {
750 		if (ttos->options[i].alias)
751 			continue;
752 		for (desc = ttos->options[i].desc;
753 		    desc->ifmt_string != NULL; desc++) {
754 			if (ifmw & desc->ifmt_word) {
755 				if (seen_option == 0)
756 					printf(" mediaopt ");
757 				printf("%s%s", seen_option++ ? "," : "",
758 				    desc->ifmt_string);
759 			}
760 		}
761 	}
762 
763 	if (IFM_INST(ifmw) != 0)
764 		printf(" instance %d", IFM_INST(ifmw));
765 }
766 
767 /**********************************************************************
768  * ...until here.
769  **********************************************************************/
770 
771 static struct cmd media_cmds[] = {
772 	DEF_CMD_ARG("media",	setmedia),
773 	DEF_CMD_ARG("mode",	setmediamode),
774 	DEF_CMD_ARG("mediaopt",	setmediaopt),
775 	DEF_CMD_ARG("-mediaopt",unsetmediaopt),
776 	DEF_CMD_ARG("inst",	setmediainst),
777 	DEF_CMD_ARG("instance",	setmediainst),
778 };
779 static struct afswtch af_media = {
780 	.af_name	= "af_media",
781 	.af_af		= AF_UNSPEC,
782 	.af_other_status = media_status,
783 };
784 
785 static __constructor void
786 ifmedia_ctor(void)
787 {
788 	size_t i;
789 
790 	for (i = 0; i < nitems(media_cmds);  i++)
791 		cmd_register(&media_cmds[i]);
792 	af_register(&af_media);
793 }
794