xref: /dragonfly/sbin/ifconfig/ifmedia.c (revision 6bd457ed)
1 /*	$NetBSD: ifconfig.c,v 1.34 1997/04/21 01:17:58 lukem Exp $	*/
2 /* $FreeBSD: src/sbin/ifconfig/ifmedia.c,v 1.6.2.3 2001/11/14 04:35:07 yar Exp $ */
3 /* $DragonFly: src/sbin/ifconfig/ifmedia.c,v 1.8 2005/03/06 05:01:59 dillon Exp $ */
4 
5 /*
6  * Copyright (c) 1997 Jason R. Thorpe.
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. All advertising materials mentioning features or use of this software
18  *    must display the following acknowledgement:
19  *      This product includes software developed for the NetBSD Project
20  *	by Jason R. Thorpe.
21  * 4. The name of the author may not be used to endorse or promote products
22  *    derived from this software without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
29  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
31  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  */
36 
37 /*
38  * Copyright (c) 1983, 1993
39  *	The Regents of the University of California.  All rights reserved.
40  *
41  * Redistribution and use in source and binary forms, with or without
42  * modification, are permitted provided that the following conditions
43  * are met:
44  * 1. Redistributions of source code must retain the above copyright
45  *    notice, this list of conditions and the following disclaimer.
46  * 2. Redistributions in binary form must reproduce the above copyright
47  *    notice, this list of conditions and the following disclaimer in the
48  *    documentation and/or other materials provided with the distribution.
49  * 3. All advertising materials mentioning features or use of this software
50  *    must display the following acknowledgement:
51  *	This product includes software developed by the University of
52  *	California, Berkeley and its contributors.
53  * 4. Neither the name of the University nor the names of its contributors
54  *    may be used to endorse or promote products derived from this software
55  *    without specific prior written permission.
56  *
57  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
58  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
59  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
60  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
61  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
62  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
63  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
64  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
65  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
66  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
67  * SUCH DAMAGE.
68  */
69 
70 #include <sys/param.h>
71 #include <sys/ioctl.h>
72 #include <sys/socket.h>
73 #include <sys/sysctl.h>
74 #include <sys/time.h>
75 
76 #include <net/if.h>
77 #include <net/if_dl.h>
78 #include <net/if_types.h>
79 #include <net/if_media.h>
80 #include <net/route.h>
81 
82 #include <ctype.h>
83 #include <err.h>
84 #include <errno.h>
85 #include <fcntl.h>
86 #include <stdio.h>
87 #include <stdlib.h>
88 #include <string.h>
89 #include <unistd.h>
90 
91 #include "ifconfig.h"
92 
93 #ifndef IFM_SUBTYPE_IEEE80211_MODE_DESCRIPTIONS
94   #define IFM_SUBTYPE_IEEE80211_MODE_DESCRIPTIONS {                       \
95         { IFM_AUTO, "autoselect" },                                     \
96         { IFM_IEEE80211_11A, "11a" },                                   \
97         { IFM_IEEE80211_11B, "11b" },                                   \
98         { IFM_IEEE80211_11G, "11g" },                                   \
99         { IFM_IEEE80211_FH, "fh" },                                     \
100         { 0, NULL },                                                    \
101 }
102 #endif
103 
104 #ifndef IFM_SUBTYPE_IEEE80211_MODE_ALIASES
105   #define IFM_SUBTYPE_IEEE80211_MODE_ALIASES {                            \
106         { IFM_AUTO, "auto" },                                           \
107         { 0, NULL },                                                    \
108 }
109 #endif
110 
111 static void	domediaopt(const char *, int, int);
112 static int	get_media_subtype(int, const char *);
113 static int	get_media_mode(int, const char *);
114 static int	get_media_options(int, const char *);
115 static int	lookup_media_word(struct ifmedia_description *, const char *);
116 static void	print_media_word(int, int);
117 static void	print_media_word_ifconfig(int);
118 
119 static struct ifmedia_description *get_toptype_desc(int);
120 static struct ifmedia_type_to_subtype *get_toptype_ttos(int);
121 static struct ifmedia_description *get_subtype_desc(int,
122     struct ifmedia_type_to_subtype *ttos);
123 
124 void
125 media_status(int s, struct rt_addrinfo *info __unused)
126 {
127 	struct ifmediareq ifmr;
128 	int *media_list, i;
129 
130 	(void) memset(&ifmr, 0, sizeof(ifmr));
131 	(void) strncpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));
132 
133 	if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
134 		/*
135 		 * Interface doesn't support SIOC{G,S}IFMEDIA.
136 		 */
137 		return;
138 	}
139 
140 	if (ifmr.ifm_count == 0) {
141 		warnx("%s: no media types?", name);
142 		return;
143 	}
144 
145 	media_list = (int *)malloc(ifmr.ifm_count * sizeof(int));
146 	if (media_list == NULL)
147 		err(1, "malloc");
148 	ifmr.ifm_ulist = media_list;
149 
150 	if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0)
151 		err(1, "SIOCGIFMEDIA");
152 
153 	printf("\tmedia: ");
154 	print_media_word(ifmr.ifm_current, 1);
155 	if (ifmr.ifm_active != ifmr.ifm_current) {
156 		putchar(' ');
157 		putchar('(');
158 		print_media_word(ifmr.ifm_active, 0);
159 		putchar(')');
160 	}
161 
162 	putchar('\n');
163 
164 	if (ifmr.ifm_status & IFM_AVALID) {
165 		printf("\tstatus: ");
166 		switch (IFM_TYPE(ifmr.ifm_active)) {
167 		case IFM_ETHER:
168 			if (ifmr.ifm_status & IFM_ACTIVE)
169 				printf("active");
170 			else
171 				printf("no carrier");
172 			break;
173 
174 		case IFM_FDDI:
175 		case IFM_TOKEN:
176 			if (ifmr.ifm_status & IFM_ACTIVE)
177 				printf("inserted");
178 			else
179 				printf("no ring");
180 			break;
181 
182 #if notyet
183 		case IFM_ATM:
184 			if (ifmr.ifm_status & IFM_ACTIVE)
185 				printf("active");
186 			else
187 				printf("no carrier");
188 			break;
189 #endif
190 
191 		case IFM_IEEE80211:
192 			/* XXX: Different value for adhoc? */
193 			if (ifmr.ifm_status & IFM_ACTIVE)
194 				printf("associated");
195 			else
196 				printf("no carrier");
197 			break;
198 		}
199 		putchar('\n');
200 	}
201 
202 	if (ifmr.ifm_count > 0 && supmedia) {
203 		printf("\tsupported media:\n");
204 		for (i = 0; i < ifmr.ifm_count; i++) {
205 			printf("\t\t");
206 			print_media_word_ifconfig(media_list[i]);
207 			putchar('\n');
208 		}
209 	}
210 
211 	free(media_list);
212 }
213 
214 void
215 setmedia(const char *val, int d __unused, int s,
216 	 const struct afswtch *afp __unused)
217 {
218 	struct ifmediareq ifmr;
219 	int first_type, subtype;
220 
221 	(void) memset(&ifmr, 0, sizeof(ifmr));
222 	(void) strncpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));
223 
224 	ifmr.ifm_count = 1;
225 	ifmr.ifm_ulist = &first_type;
226 	if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
227 		/*
228 		 * If we get E2BIG, the kernel is telling us
229 		 * that there are more, so we can ignore it.
230 		 */
231 		if (errno != E2BIG)
232 			err(1, "SIOCGIFMEDIA");
233 	}
234 
235 	if (ifmr.ifm_count == 0)
236 		errx(1, "%s: no media types?", name);
237 
238 	/*
239 	 * We are primarily concerned with the top-level type.
240 	 * However, "current" may be only IFM_NONE, so we just look
241 	 * for the top-level type in the first "supported type"
242 	 * entry.
243 	 *
244 	 * (I'm assuming that all supported media types for a given
245 	 * interface will be the same top-level type..)
246 	 */
247 	subtype = get_media_subtype(IFM_TYPE(first_type), val);
248 
249 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
250 	ifr.ifr_media = (ifmr.ifm_current & ~(IFM_NMASK|IFM_TMASK)) |
251 	    IFM_TYPE(first_type) | subtype;
252 
253 	if (ioctl(s, SIOCSIFMEDIA, (caddr_t)&ifr) < 0)
254 		err(1, "SIOCSIFMEDIA (media)");
255 }
256 
257 void
258 setmediaopt(const char *val, int d __unused, int s,
259 	    const struct afswtch *afp __unused)
260 {
261 
262 	domediaopt(val, 0, s);
263 }
264 
265 void
266 unsetmediaopt(const char *val, int d __unused, int s,
267 	      const struct afswtch *afp __unused)
268 {
269 
270 	domediaopt(val, 1, s);
271 }
272 
273 static void
274 domediaopt(const char *val, int clear, int s)
275 {
276 	struct ifmediareq ifmr;
277 	int *mwords, options;
278 
279 	(void) memset(&ifmr, 0, sizeof(ifmr));
280 	(void) strncpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));
281 
282 	/*
283 	 * We must go through the motions of reading all
284 	 * supported media because we need to know both
285 	 * the current media type and the top-level type.
286 	 */
287 
288 	if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0)
289 		err(1, "SIOCGIFMEDIA");
290 
291 	if (ifmr.ifm_count == 0)
292 		errx(1, "%s: no media types?", name);
293 
294 	mwords = (int *)malloc(ifmr.ifm_count * sizeof(int));
295 	if (mwords == NULL)
296 		err(1, "malloc");
297 
298 	ifmr.ifm_ulist = mwords;
299 	if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0)
300 		err(1, "SIOCGIFMEDIA");
301 
302 	options = get_media_options(IFM_TYPE(mwords[0]), val);
303 
304 	free(mwords);
305 
306 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
307 	ifr.ifr_media = ifmr.ifm_current;
308 	if (clear)
309 		ifr.ifr_media &= ~options;
310 	else
311 		ifr.ifr_media |= options;
312 
313 	if (ioctl(s, SIOCSIFMEDIA, (caddr_t)&ifr) < 0)
314 		err(1, "SIOCSIFMEDIA (mediaopt)");
315 }
316 
317 
318 void
319 setmediamode(const char *val, int d __unused, int s,
320 	const struct afswtch *afp __unused)
321 {
322 	struct ifmediareq ifmr;
323 	int *mwords, mode;
324 
325 	(void) memset(&ifmr, 0, sizeof(ifmr));
326 	(void) strncpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));
327 
328 	/*
329 	 * We must go through the motions of reading all
330 	 * supported media because we need to know both
331 	 * the current media type and the top-level type.
332 	 */
333 
334 	if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0)
335 		err(1, "SIOCGIFMEDIA");
336 
337 	if (ifmr.ifm_count == 0)
338 		errx(1, "%s: no media types?", name);
339 
340 	mwords = (int *)malloc(ifmr.ifm_count * sizeof(int));
341 	if (mwords == NULL)
342 		err(1, "malloc");
343 
344 	ifmr.ifm_ulist = mwords;
345 	if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0)
346 		err(1, "SIOCGIFMEDIA");
347 
348 	mode = get_media_mode(IFM_TYPE(mwords[0]), val);
349 
350 	free(mwords);
351 
352 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
353 	ifr.ifr_media = (ifmr.ifm_current & ~IFM_MMASK) | mode;
354 
355 	if (ioctl(s, SIOCSIFMEDIA, (caddr_t)&ifr) < 0)
356 		err(1, "SIOCSIFMEDIA (mode)");
357 }
358 
359 /**********************************************************************
360  * A good chunk of this is duplicated from sys/net/ifmedia.c
361  **********************************************************************/
362 
363 static struct ifmedia_description ifm_type_descriptions[] =
364     IFM_TYPE_DESCRIPTIONS;
365 
366 static struct ifmedia_description ifm_subtype_ethernet_descriptions[] =
367     IFM_SUBTYPE_ETHERNET_DESCRIPTIONS;
368 
369 static struct ifmedia_description ifm_subtype_ethernet_aliases[] =
370     IFM_SUBTYPE_ETHERNET_ALIASES;
371 
372 static struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] =
373     IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS;
374 
375 static struct ifmedia_description ifm_subtype_tokenring_descriptions[] =
376     IFM_SUBTYPE_TOKENRING_DESCRIPTIONS;
377 
378 static struct ifmedia_description ifm_subtype_tokenring_aliases[] =
379     IFM_SUBTYPE_TOKENRING_ALIASES;
380 
381 static struct ifmedia_description ifm_subtype_tokenring_option_descriptions[] =
382     IFM_SUBTYPE_TOKENRING_OPTION_DESCRIPTIONS;
383 
384 static struct ifmedia_description ifm_subtype_fddi_descriptions[] =
385     IFM_SUBTYPE_FDDI_DESCRIPTIONS;
386 
387 static struct ifmedia_description ifm_subtype_fddi_aliases[] =
388     IFM_SUBTYPE_FDDI_ALIASES;
389 
390 static struct ifmedia_description ifm_subtype_fddi_option_descriptions[] =
391     IFM_SUBTYPE_FDDI_OPTION_DESCRIPTIONS;
392 
393 static struct ifmedia_description ifm_subtype_ieee80211_descriptions[] =
394     IFM_SUBTYPE_IEEE80211_DESCRIPTIONS;
395 
396 static struct ifmedia_description ifm_subtype_ieee80211_aliases[] =
397     IFM_SUBTYPE_IEEE80211_ALIASES;
398 
399 static struct ifmedia_description ifm_subtype_ieee80211_option_descriptions[] =
400     IFM_SUBTYPE_IEEE80211_OPTION_DESCRIPTIONS;
401 
402 struct ifmedia_description ifm_subtype_ieee80211_mode_descriptions[] =
403     IFM_SUBTYPE_IEEE80211_MODE_DESCRIPTIONS;
404 
405 struct ifmedia_description ifm_subtype_ieee80211_mode_aliases[] =
406     IFM_SUBTYPE_IEEE80211_MODE_ALIASES;
407 
408 #if notyet
409 static struct ifmedia_description ifm_subtype_atm_descriptions[] =
410     IFM_SUBTYPE_ATM_DESCRIPTIONS;
411 
412 static struct ifmedia_description ifm_subtype_atm_aliases[] =
413     IFM_SUBTYPE_ATM_ALIASES;
414 
415 static struct ifmedia_description ifm_subtype_atm_option_descriptions[] =
416     IFM_SUBTYPE_ATM_OPTION_DESCRIPTIONS;
417 #endif
418 
419 static struct ifmedia_description ifm_subtype_shared_descriptions[] =
420     IFM_SUBTYPE_SHARED_DESCRIPTIONS;
421 
422 static struct ifmedia_description ifm_subtype_shared_aliases[] =
423     IFM_SUBTYPE_SHARED_ALIASES;
424 
425 static struct ifmedia_description ifm_shared_option_descriptions[] =
426     IFM_SHARED_OPTION_DESCRIPTIONS;
427 
428 struct ifmedia_type_to_subtype {
429 	struct {
430 		struct ifmedia_description *desc;
431 		int alias;
432 	} subtypes[5];
433 	struct {
434 		struct ifmedia_description *desc;
435 		int alias;
436 	} options[3];
437 	struct {
438 		struct ifmedia_description *desc;
439 		int alias;
440 	} modes[3];
441 };
442 
443 /* must be in the same order as IFM_TYPE_DESCRIPTIONS */
444 static struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = {
445 	{
446 		{
447 			{ &ifm_subtype_shared_descriptions[0], 0 },
448 			{ &ifm_subtype_shared_aliases[0], 1 },
449 			{ &ifm_subtype_ethernet_descriptions[0], 0 },
450 			{ &ifm_subtype_ethernet_aliases[0], 1 },
451 			{ NULL, 0 },
452 		},
453 		{
454 			{ &ifm_shared_option_descriptions[0], 0 },
455 			{ &ifm_subtype_ethernet_option_descriptions[0], 0 },
456 			{ NULL, 0 },
457 		},
458 		{
459 			{ NULL, 0 },
460 		},
461 	},
462 	{
463 		{
464 			{ &ifm_subtype_shared_descriptions[0], 0 },
465 			{ &ifm_subtype_shared_aliases[0], 1 },
466 			{ &ifm_subtype_tokenring_descriptions[0], 0 },
467 			{ &ifm_subtype_tokenring_aliases[0], 1 },
468 			{ NULL, 0 },
469 		},
470 		{
471 			{ &ifm_shared_option_descriptions[0], 0 },
472 			{ &ifm_subtype_tokenring_option_descriptions[0], 0 },
473 			{ NULL, 0 },
474 		},
475 		{
476 			{ NULL, 0 },
477 		},
478 	},
479 	{
480 		{
481 			{ &ifm_subtype_shared_descriptions[0], 0 },
482 			{ &ifm_subtype_shared_aliases[0], 1 },
483 			{ &ifm_subtype_fddi_descriptions[0], 0 },
484 			{ &ifm_subtype_fddi_aliases[0], 1 },
485 			{ NULL, 0 },
486 		},
487 		{
488 			{ &ifm_shared_option_descriptions[0], 0 },
489 			{ &ifm_subtype_fddi_option_descriptions[0], 0 },
490 			{ NULL, 0 },
491 		},
492 		{
493 			{ NULL, 0 },
494 		},
495 	},
496 	{
497 		{
498 			{ &ifm_subtype_shared_descriptions[0], 0 },
499 			{ &ifm_subtype_shared_aliases[0], 1 },
500 			{ &ifm_subtype_ieee80211_descriptions[0], 0 },
501 			{ &ifm_subtype_ieee80211_aliases[0], 1 },
502 			{ NULL, 0 },
503 		},
504 		{
505 			{ &ifm_shared_option_descriptions[0], 0 },
506 			{ &ifm_subtype_ieee80211_option_descriptions[0], 0 },
507 			{ NULL, 0 },
508 		},
509 		{
510 			{ &ifm_subtype_ieee80211_mode_descriptions[0], 0 },
511 			{ &ifm_subtype_ieee80211_mode_aliases[0], 0 },
512 			{ NULL, 0 },
513 		},
514 	},
515 	{
516 		{
517 			{ &ifm_subtype_shared_descriptions[0], 0 },
518 			{ &ifm_subtype_shared_aliases[0], 1 },
519 #if notyet
520 			{ &ifm_subtype_atm_descriptions[0], 0 },
521 			{ &ifm_subtype_atm_aliases[0], 1 },
522 #endif
523 			{ NULL, 0 },
524 		},
525 		{
526 			{ &ifm_shared_option_descriptions[0], 0 },
527 #if notyet
528 			{ &ifm_subtype_atm_option_descriptions[0], 0 },
529 #endif
530 			{ NULL, 0 },
531 		},
532 		{
533 			{ NULL, 0 },
534 		},
535 	},
536 };
537 
538 static int
539 get_media_subtype(int type, const char *val)
540 {
541 	struct ifmedia_description *desc;
542 	struct ifmedia_type_to_subtype *ttos;
543 	int rval, i;
544 
545 	/* Find the top-level interface type. */
546 	for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
547 	    desc->ifmt_string != NULL; desc++, ttos++)
548 		if (type == desc->ifmt_word)
549 			break;
550 	if (desc->ifmt_string == NULL)
551 		errx(1, "unknown media type 0x%x", type);
552 
553 	for (i = 0; ttos->subtypes[i].desc != NULL; i++) {
554 		rval = lookup_media_word(ttos->subtypes[i].desc, val);
555 		if (rval != -1)
556 			return (rval);
557 	}
558 	errx(1, "unknown media subtype: %s", val);
559 	/*NOTREACHED*/
560 }
561 
562 static int
563 get_media_mode(int type, const char *val)
564 {
565 	struct ifmedia_description *desc;
566 	struct ifmedia_type_to_subtype *ttos;
567 	int rval, i;
568 
569 	/* Find the top-level interface type. */
570 	for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
571 	    desc->ifmt_string != NULL; desc++, ttos++)
572 		if (type == desc->ifmt_word)
573 			break;
574 	if (desc->ifmt_string == NULL)
575 		errx(1, "unknown media mode 0x%x", type);
576 
577 	for (i = 0; ttos->modes[i].desc != NULL; i++) {
578 		rval = lookup_media_word(ttos->modes[i].desc, val);
579 		if (rval != -1)
580 			return (rval);
581 	}
582 	return -1;
583 }
584 
585 static int
586 get_media_options(int type, const char *val)
587 {
588 	struct ifmedia_description *desc;
589 	struct ifmedia_type_to_subtype *ttos;
590 	char *optlist, *optptr;
591 	int option = 0, i, rval = 0;
592 
593 	/* We muck with the string, so copy it. */
594 	optlist = strdup(val);
595 	if (optlist == NULL)
596 		err(1, "strdup");
597 
598 	/* Find the top-level interface type. */
599 	for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
600 	    desc->ifmt_string != NULL; desc++, ttos++)
601 		if (type == desc->ifmt_word)
602 			break;
603 	if (desc->ifmt_string == NULL)
604 		errx(1, "unknown media type 0x%x", type);
605 
606 	/*
607 	 * Look up the options in the user-provided comma-separated
608 	 * list.
609 	 */
610 	optptr = optlist;
611 	for (; (optptr = strtok(optptr, ",")) != NULL; optptr = NULL) {
612 		for (i = 0; ttos->options[i].desc != NULL; i++) {
613 			option = lookup_media_word(ttos->options[i].desc, optptr);
614 			if (option != -1)
615 				break;
616 		}
617 		if (option == 0)
618 			errx(1, "unknown option: %s", optptr);
619 		rval |= option;
620 	}
621 
622 	free(optlist);
623 	return (rval);
624 }
625 
626 static int
627 lookup_media_word(struct ifmedia_description *desc, const char *val)
628 {
629 
630 	for (; desc->ifmt_string != NULL; desc++)
631 		if (strcasecmp(desc->ifmt_string, val) == 0)
632 			return (desc->ifmt_word);
633 
634 	return (-1);
635 }
636 
637 static struct ifmedia_description *get_toptype_desc(int ifmw)
638 {
639 	struct ifmedia_description *desc;
640 
641 	for (desc = ifm_type_descriptions; desc->ifmt_string != NULL; desc++)
642 		if (IFM_TYPE(ifmw) == desc->ifmt_word)
643 			break;
644 
645 	return desc;
646 }
647 
648 static struct ifmedia_type_to_subtype *get_toptype_ttos(int ifmw)
649 {
650 	struct ifmedia_description *desc;
651 	struct ifmedia_type_to_subtype *ttos;
652 
653 	for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
654 	    desc->ifmt_string != NULL; desc++, ttos++)
655 		if (IFM_TYPE(ifmw) == desc->ifmt_word)
656 			break;
657 
658 	return ttos;
659 }
660 
661 static struct ifmedia_description *get_subtype_desc(int ifmw,
662     struct ifmedia_type_to_subtype *ttos)
663 {
664 	int i;
665 	struct ifmedia_description *desc;
666 
667 	for (i = 0; ttos->subtypes[i].desc != NULL; i++) {
668 		if (ttos->subtypes[i].alias)
669 			continue;
670 		for (desc = ttos->subtypes[i].desc;
671 		    desc->ifmt_string != NULL; desc++) {
672 			if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
673 				return desc;
674 		}
675 	}
676 
677 	return NULL;
678 }
679 
680 static struct ifmedia_description *get_mode_desc(int ifmw,
681     struct ifmedia_type_to_subtype *ttos)
682 {
683 	int i;
684 	struct ifmedia_description *desc;
685 
686 	for (i = 0; ttos->modes[i].desc != NULL; i++) {
687 		if (ttos->modes[i].alias)
688 			continue;
689 		for (desc = ttos->modes[i].desc;
690 		    desc->ifmt_string != NULL; desc++) {
691 			if (IFM_MODE(ifmw) == desc->ifmt_word)
692 				return desc;
693 		}
694 	}
695 
696 	return NULL;
697 }
698 
699 static void
700 print_media_word(int ifmw, int print_toptype)
701 {
702 	struct ifmedia_description *desc;
703 	struct ifmedia_type_to_subtype *ttos;
704 	int seen_option = 0, i;
705 
706 	/* Find the top-level interface type. */
707 	desc = get_toptype_desc(ifmw);
708 	ttos = get_toptype_ttos(ifmw);
709 	if (desc->ifmt_string == NULL) {
710 		printf("<unknown type>");
711 		return;
712 	} else if (print_toptype) {
713 		printf("%s", desc->ifmt_string);
714 	}
715 
716 	/*
717 	 * Don't print the top-level type; it's not like we can
718 	 * change it, or anything.
719 	 */
720 
721 	/* Find subtype. */
722 	desc = get_subtype_desc(ifmw, ttos);
723 	if (desc != NULL)
724 		goto got_subtype;
725 
726 	/* Falling to here means unknown subtype. */
727 	printf("<unknown subtype>");
728 	return;
729 
730  got_subtype:
731 	if (print_toptype)
732 		putchar(' ');
733 
734 	printf("%s", desc->ifmt_string);
735 
736 	if (print_toptype) {
737 		desc = get_mode_desc(ifmw, ttos);
738 		if (desc != NULL && strcasecmp("autoselect", desc->ifmt_string))
739 			printf(" mode %s", desc->ifmt_string);
740 	}
741 
742 	/* Find options. */
743 	for (i = 0; ttos->options[i].desc != NULL; i++) {
744 		if (ttos->options[i].alias)
745 			continue;
746 		for (desc = ttos->options[i].desc;
747 		    desc->ifmt_string != NULL; desc++) {
748 			if (ifmw & desc->ifmt_word) {
749 				if (seen_option == 0)
750 					printf(" <");
751 				printf("%s%s", seen_option++ ? "," : "",
752 				    desc->ifmt_string);
753 			}
754 		}
755 	}
756 	printf("%s", seen_option ? ">" : "");
757 }
758 
759 static void
760 print_media_word_ifconfig(int ifmw)
761 {
762 	struct ifmedia_description *desc;
763 	struct ifmedia_type_to_subtype *ttos;
764 	int i;
765 
766 	/* Find the top-level interface type. */
767 	desc = get_toptype_desc(ifmw);
768 	ttos = get_toptype_ttos(ifmw);
769 	if (desc->ifmt_string == NULL) {
770 		printf("<unknown type>");
771 		return;
772 	}
773 
774 	/*
775 	 * Don't print the top-level type; it's not like we can
776 	 * change it, or anything.
777 	 */
778 
779 	/* Find subtype. */
780 	desc = get_subtype_desc(ifmw, ttos);
781 	if (desc != NULL)
782 		goto got_subtype;
783 
784 	/* Falling to here means unknown subtype. */
785 	printf("<unknown subtype>");
786 	return;
787 
788  got_subtype:
789 	printf("media %s", desc->ifmt_string);
790 
791 	desc = get_mode_desc(ifmw, ttos);
792 	if (desc != NULL)
793 		printf(" mode %s", desc->ifmt_string);
794 
795 	/* Find options. */
796 	for (i = 0; ttos->options[i].desc != NULL; i++) {
797 		if (ttos->options[i].alias)
798 			continue;
799 		for (desc = ttos->options[i].desc;
800 		    desc->ifmt_string != NULL; desc++) {
801 			if (ifmw & desc->ifmt_word) {
802 				printf(" mediaopt %s", desc->ifmt_string);
803 			}
804 		}
805 	}
806 }
807 
808 /**********************************************************************
809  * ...until here.
810  **********************************************************************/
811