[apple/xnu.git] / bsd / net / if_media.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*	$NetBSD: if_media.c,v 1.1 1997/03/17 02:55:15 thorpej Exp $	*/
/* $FreeBSD: src/sys/net/if_media.c,v 1.9.2.4 2001/07/04 00:12:38 brooks Exp $ */

/*
 * Copyright (c) 1997
 *	Jonathan Stone and Jason R. Thorpe.  All rights reserved.
 *
 * This software is derived from information provided by Matt Thomas.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Jonathan Stone
 *	and Jason R. Thorpe for the NetBSD Project.
 * 4. The names of the authors may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * BSD/OS-compatible network interface media selection.
 *
 * Where it is safe to do so, this code strays slightly from the BSD/OS
 * design.  Software which uses the API (device drivers, basically)
 * shouldn't notice any difference.
 *
 * Many thanks to Matt Thomas for providing the information necessary
 * to implement this interface.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/malloc.h>

#include <net/if.h>
#include <net/if_media.h>

/*
 * Compile-time options:
 * IFMEDIA_DEBUG:
 *	turn on implementation-level debug printfs.
 * 	Useful for debugging newly-ported  drivers.
 */

static struct ifmedia_entry *ifmedia_match(struct ifmedia *ifm,
    int flags, int mask);

#ifdef IFMEDIA_DEBUG
int	ifmedia_debug = 0;
static	void ifmedia_printword(int);
#endif

/*
 * Initialize if_media struct for a specific interface instance.
 */
void
ifmedia_init(ifm, dontcare_mask, change_callback, status_callback)
	struct ifmedia *ifm;
	int dontcare_mask;
	ifm_change_cb_t change_callback;
	ifm_stat_cb_t status_callback;
{

	LIST_INIT(&ifm->ifm_list);
	ifm->ifm_cur = NULL;
	ifm->ifm_media = 0;
	ifm->ifm_mask = dontcare_mask;		/* IF don't-care bits */
	ifm->ifm_change = change_callback;
	ifm->ifm_status = status_callback;
}

void
ifmedia_removeall(ifm)
	struct ifmedia *ifm;
{
	struct ifmedia_entry *entry;

	for (entry = LIST_FIRST(&ifm->ifm_list); entry;
	     entry = LIST_FIRST(&ifm->ifm_list)) {
		LIST_REMOVE(entry, ifm_list);
		FREE(entry, M_IFADDR);
	}
}

/*
 * Add a media configuration to the list of supported media
 * for a specific interface instance.
 */
void
ifmedia_add(ifm, mword, data, aux)
	struct ifmedia *ifm;
	int mword;
	int data;
	void *aux;
{
	register struct ifmedia_entry *entry;

#ifdef IFMEDIA_DEBUG
	if (ifmedia_debug) {
		if (ifm == NULL) {
			printf("ifmedia_add: null ifm\n");
			return;
		}
		printf("Adding entry for ");
		ifmedia_printword(mword);
	}
#endif

	entry = _MALLOC(sizeof(*entry), M_IFADDR, M_NOWAIT);
	if (entry == NULL)
		panic("ifmedia_add: can't malloc entry");

	entry->ifm_media = mword;
	entry->ifm_data = data;
	entry->ifm_aux = aux;

	LIST_INSERT_HEAD(&ifm->ifm_list, entry, ifm_list);
}

/*
 * Add an array of media configurations to the list of
 * supported media for a specific interface instance.
 */
void
ifmedia_list_add(ifm, lp, count)
	struct ifmedia *ifm;
	struct ifmedia_entry *lp;
	int count;
{
	int i;

	for (i = 0; i < count; i++)
		ifmedia_add(ifm, lp[i].ifm_media, lp[i].ifm_data,
		    lp[i].ifm_aux);
}

/*
 * Set the default active media. 
 *
 * Called by device-specific code which is assumed to have already
 * selected the default media in hardware.  We do _not_ call the
 * media-change callback.
 */
void
ifmedia_set(ifm, target)
	struct ifmedia *ifm; 
	int target;

{
	struct ifmedia_entry *match;

	match = ifmedia_match(ifm, target, ifm->ifm_mask);

	if (match == NULL) {
		printf("ifmedia_set: no match for 0x%x/0x%x\n",
		    target, ~ifm->ifm_mask);
		panic("ifmedia_set");
	}
	ifm->ifm_cur = match;

#ifdef IFMEDIA_DEBUG
	if (ifmedia_debug) {
		printf("ifmedia_set: target ");
		ifmedia_printword(target);
		printf("ifmedia_set: setting to ");
		ifmedia_printword(ifm->ifm_cur->ifm_media);
	}
#endif
}

/*
 * Device-independent media ioctl support function.
 */
int
ifmedia_ioctl(
	struct ifnet *ifp,
	struct ifreq *ifr,
	struct ifmedia *ifm,
	u_long cmd)
{
	struct ifmedia_entry *match;
	struct ifmediareq *ifmr = (struct ifmediareq *) ifr;
	int error = 0, sticky;

	if (ifp == NULL || ifr == NULL || ifm == NULL)
		return(EINVAL);

	switch (cmd) {

	/*
	 * Set the current media.
	 */
	case  SIOCSIFMEDIA:
	{
		struct ifmedia_entry *oldentry;
		int oldmedia;
		int newmedia = ifr->ifr_media;

		match = ifmedia_match(ifm, newmedia, ifm->ifm_mask);
		if (match == NULL) {
#ifdef IFMEDIA_DEBUG
			if (ifmedia_debug) {
				printf(
				    "ifmedia_ioctl: no media found for 0x%x\n", 
				    newmedia);
			}
#endif
			return (ENXIO);
		}

		/*
		 * If no change, we're done.
		 * XXX Automedia may invole software intervention.
		 *     Keep going in case the the connected media changed.
		 *     Similarly, if best match changed (kernel debugger?).
		 */
		if ((IFM_SUBTYPE(newmedia) != IFM_AUTO) &&
		    (newmedia == ifm->ifm_media) &&
		    (match == ifm->ifm_cur))
			return 0;

		/*
		 * We found a match, now make the driver switch to it.
		 * Make sure to preserve our old media type in case the
		 * driver can't switch.
		 */
#ifdef IFMEDIA_DEBUG
		if (ifmedia_debug) {
			printf("ifmedia_ioctl: switching %s to ",
			    ifp->if_xname);
			ifmedia_printword(match->ifm_media);
		}
#endif
		oldentry = ifm->ifm_cur;
		oldmedia = ifm->ifm_media;
		ifm->ifm_cur = match;
		ifm->ifm_media = newmedia;
		error = (*ifm->ifm_change)(ifp);
		if (error) {
			ifm->ifm_cur = oldentry;
			ifm->ifm_media = oldmedia;
		}
		break;
	}

	/*
	 * Get list of available media and current media on interface.
	 */
	case  SIOCGIFMEDIA: 
	{
		struct ifmedia_entry *ep;
		int *kptr, count;
		int usermax;	/* user requested max */

		kptr = NULL;		/* XXX gcc */

		ifmr->ifm_active = ifmr->ifm_current = ifm->ifm_cur ?
		    ifm->ifm_cur->ifm_media : IFM_NONE;
		ifmr->ifm_mask = ifm->ifm_mask;
		ifmr->ifm_status = 0;
		(*ifm->ifm_status)(ifp, ifmr);

		count = 0;
		usermax = 0;

		/*
		 * If there are more interfaces on the list, count
		 * them.  This allows the caller to set ifmr->ifm_count
		 * to 0 on the first call to know how much space to
		 * allocate.
		 */
		LIST_FOREACH(ep, &ifm->ifm_list, ifm_list)
			usermax++;

		/*
		 * Don't allow the user to ask for too many
		 * or a negative number.
		 */
		if (ifmr->ifm_count > usermax)
			ifmr->ifm_count = usermax;
		else if (ifmr->ifm_count < 0)
			return (EINVAL);

		if (ifmr->ifm_count != 0) {
			kptr = (int *) _MALLOC(ifmr->ifm_count * sizeof(int),
			    M_TEMP, M_WAITOK);

			/*
			 * Get the media words from the interface's list.
			 */
			ep = LIST_FIRST(&ifm->ifm_list);
			for (; ep != NULL && count < ifmr->ifm_count;
			    ep = LIST_NEXT(ep, ifm_list), count++)
				kptr[count] = ep->ifm_media;

			if (ep != NULL)
				error = E2BIG;	/* oops! */
		} else {
			count = usermax;
		}

		/*
		 * We do the copyout on E2BIG, because that's
		 * just our way of telling userland that there
		 * are more.  This is the behavior I've observed
		 * under BSD/OS 3.0
		 */
		sticky = error;
		if ((error == 0 || error == E2BIG) && ifmr->ifm_count != 0) {
			error = copyout((caddr_t)kptr,
			    CAST_USER_ADDR_T(ifmr->ifm_ulist),
			    ifmr->ifm_count * sizeof(int));
		}

		if (error == 0)
			error = sticky;

		if (ifmr->ifm_count != 0)
			FREE(kptr, M_TEMP);

		ifmr->ifm_count = count;
		break;
	}

	default:
		return (EINVAL);
	}

	return (error);
}

/*
 * Find media entry matching a given ifm word.
 *
 */
static struct ifmedia_entry *
ifmedia_match(ifm, target, mask)
	struct ifmedia *ifm; 
	int target;
	int mask;
{
	struct ifmedia_entry *match, *next;

	match = NULL;
	mask = ~mask;

	LIST_FOREACH(next, &ifm->ifm_list, ifm_list) {
		if ((next->ifm_media & mask) == (target & mask)) {
#if defined(IFMEDIA_DEBUG) || defined(DIAGNOSTIC)
			if (match) {
				printf("ifmedia_match: multiple match for "
				    "0x%x/0x%x\n", target, mask);
			}
#endif
			match = next;
		}
	}

	return match;
}

#ifdef IFMEDIA_DEBUG
struct ifmedia_description ifm_type_descriptions[] =
    IFM_TYPE_DESCRIPTIONS;

struct ifmedia_description ifm_subtype_ethernet_descriptions[] =
    IFM_SUBTYPE_ETHERNET_DESCRIPTIONS;

struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] =
    IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS;

struct ifmedia_description ifm_subtype_tokenring_descriptions[] =
    IFM_SUBTYPE_TOKENRING_DESCRIPTIONS;

struct ifmedia_description ifm_subtype_tokenring_option_descriptions[] =
    IFM_SUBTYPE_TOKENRING_OPTION_DESCRIPTIONS;

struct ifmedia_description ifm_subtype_fddi_descriptions[] =
    IFM_SUBTYPE_FDDI_DESCRIPTIONS;

struct ifmedia_description ifm_subtype_fddi_option_descriptions[] =
    IFM_SUBTYPE_FDDI_OPTION_DESCRIPTIONS;

struct ifmedia_description ifm_subtype_80211_descriptions[] =
    IFM_SUBTYPE_IEEE80211_DESCRIPTIONS;

struct ifmedia_description ifm_subtype_80211_option_descriptions[] =
    IFM_SUBTYPE_IEEE80211_OPTION_DESCRIPTIONS;

struct ifmedia_description ifm_subtype_shared_descriptions[] =
    IFM_SUBTYPE_SHARED_DESCRIPTIONS;

struct ifmedia_description ifm_shared_option_descriptions[] =
    IFM_SHARED_OPTION_DESCRIPTIONS;

struct ifmedia_type_to_subtype {
	struct ifmedia_description *subtypes;
	struct ifmedia_description *options;
};

/* must be in the same order as IFM_TYPE_DESCRIPTIONS */
struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = {
	{
	  &ifm_subtype_ethernet_descriptions[0],
	  &ifm_subtype_ethernet_option_descriptions[0]
	},
	{
	  &ifm_subtype_tokenring_descriptions[0],
	  &ifm_subtype_tokenring_option_descriptions[0]
	},
	{
	  &ifm_subtype_fddi_descriptions[0],
	  &ifm_subtype_fddi_option_descriptions[0]
	},
	{
	  &ifm_subtype_80211_descriptions[0],
	  &ifm_subtype_80211_option_descriptions[0]
	},
};

/*
 * print a media word.
 */
static void
ifmedia_printword(ifmw)
	int ifmw;
{
	struct ifmedia_description *desc;
	struct ifmedia_type_to_subtype *ttos;
	int seen_option = 0;

	/* Find the top-level interface type. */
	for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
	    desc->ifmt_string != NULL; desc++, ttos++)
		if (IFM_TYPE(ifmw) == desc->ifmt_word)
			break;
	if (desc->ifmt_string == NULL) {
		printf("<unknown type>\n");
		return;
	}
	printf(desc->ifmt_string);

	/*
	 * Check for the shared subtype descriptions first, then the
	 * type-specific ones.
	 */
	for (desc = ifm_subtype_shared_descriptions;
	    desc->ifmt_string != NULL; desc++)
		if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
			goto got_subtype;

	for (desc = ttos->subtypes; desc->ifmt_string != NULL; desc++)
		if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
			break;
	if (desc->ifmt_string == NULL) {
		printf(" <unknown subtype>\n");
		return;
	}

 got_subtype:
	printf(" %s", desc->ifmt_string);

	/*
	 * Look for shared options.
	 */
	for (desc = ifm_shared_option_descriptions;
	    desc->ifmt_string != NULL; desc++) {
		if (ifmw & desc->ifmt_word) {
			if (seen_option == 0)
				printf(" <");
			printf("%s%s", seen_option++ ? "," : "",
			    desc->ifmt_string);
		}
	}

	/*
	 * Look for subtype-specific options.
	 */
	for (desc = ttos->options; desc->ifmt_string != NULL; desc++) {
		if (ifmw & desc->ifmt_word) {
			if (seen_option == 0)
				printf(" <");
			printf("%s%s", seen_option++ ? "," : "",
			    desc->ifmt_string); 
		}
	}
	printf("%s\n", seen_option ? ">" : "");
}
#endif /* IFMEDIA_DEBUG */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
ff6e181a A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
1c79356b	12	*
ff6e181a A	13	* The Original Code and all software distributed under the License are
ff6e181a A	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
ff6e181a A	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
1c79356b A	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23	/* $NetBSD: if_media.c,v 1.1 1997/03/17 02:55:15 thorpej Exp $ */
9bccf70c	24	/* $FreeBSD: src/sys/net/if_media.c,v 1.9.2.4 2001/07/04 00:12:38 brooks Exp $ */
1c79356b A	25
	26	/*
	27	* Copyright (c) 1997
	28	* Jonathan Stone and Jason R. Thorpe. All rights reserved.
	29	*
	30	* This software is derived from information provided by Matt Thomas.
	31	*
	32	* Redistribution and use in source and binary forms, with or without
	33	* modification, are permitted provided that the following conditions
	34	* are met:
	35	* 1. Redistributions of source code must retain the above copyright
	36	* notice, this list of conditions and the following disclaimer.
	37	* 2. Redistributions in binary form must reproduce the above copyright
	38	* notice, this list of conditions and the following disclaimer in the
	39	* documentation and/or other materials provided with the distribution.
	40	* 3. All advertising materials mentioning features or use of this software
	41	* must display the following acknowledgement:
	42	* This product includes software developed by Jonathan Stone
	43	* and Jason R. Thorpe for the NetBSD Project.
	44	* 4. The names of the authors may not be used to endorse or promote products
	45	* derived from this software without specific prior written permission.
	46	*
	47	* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
	48	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	49	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	50	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	51	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
	52	* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	53	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
	54	* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	55	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	56	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	57	* SUCH DAMAGE.
	58	*/
	59
	60	/*
	61	* BSD/OS-compatible network interface media selection.
	62	*
	63	* Where it is safe to do so, this code strays slightly from the BSD/OS
	64	* design. Software which uses the API (device drivers, basically)
	65	* shouldn't notice any difference.
	66	*
	67	* Many thanks to Matt Thomas for providing the information necessary
	68	* to implement this interface.
	69	*/
	70
	71	#include <sys/param.h>
	72	#include <sys/systm.h>
	73	#include <sys/socket.h>
	74	#include <sys/sockio.h>
	75	#include <sys/malloc.h>
	76
	77	#include <net/if.h>
	78	#include <net/if_media.h>
	79
	80	/*
	81	* Compile-time options:
	82	* IFMEDIA_DEBUG:
	83	* turn on implementation-level debug printfs.
	84	* Useful for debugging newly-ported drivers.
	85	*/
	86
91447636 A	87	static struct ifmedia_entry ifmedia_match(struct ifmedia ifm,
91447636 A	88	int flags, int mask);
1c79356b A	89
	90	#ifdef IFMEDIA_DEBUG
	91	int ifmedia_debug = 0;
91447636	92	static void ifmedia_printword(int);
1c79356b A	93	#endif
	94
	95	/*
	96	* Initialize if_media struct for a specific interface instance.
	97	*/
	98	void
	99	ifmedia_init(ifm, dontcare_mask, change_callback, status_callback)
	100	struct ifmedia *ifm;
	101	int dontcare_mask;
	102	ifm_change_cb_t change_callback;
	103	ifm_stat_cb_t status_callback;
	104	{
	105
	106	LIST_INIT(&ifm->ifm_list);
	107	ifm->ifm_cur = NULL;
	108	ifm->ifm_media = 0;
	109	ifm->ifm_mask = dontcare_mask; /* IF don't-care bits */
	110	ifm->ifm_change = change_callback;
	111	ifm->ifm_status = status_callback;
	112	}
	113
9bccf70c A	114	void
	115	ifmedia_removeall(ifm)
	116	struct ifmedia *ifm;
	117	{
	118	struct ifmedia_entry *entry;
	119
	120	for (entry = LIST_FIRST(&ifm->ifm_list); entry;
	121	entry = LIST_FIRST(&ifm->ifm_list)) {
	122	LIST_REMOVE(entry, ifm_list);
	123	FREE(entry, M_IFADDR);
	124	}
	125	}
	126
1c79356b A	127	/*
	128	* Add a media configuration to the list of supported media
	129	* for a specific interface instance.
	130	*/
	131	void
	132	ifmedia_add(ifm, mword, data, aux)
	133	struct ifmedia *ifm;
	134	int mword;
	135	int data;
	136	void *aux;
	137	{
	138	register struct ifmedia_entry *entry;
	139
	140	#ifdef IFMEDIA_DEBUG
	141	if (ifmedia_debug) {
	142	if (ifm == NULL) {
	143	printf("ifmedia_add: null ifm\n");
	144	return;
	145	}
	146	printf("Adding entry for ");
	147	ifmedia_printword(mword);
	148	}
	149	#endif
	150
9bccf70c	151	entry = _MALLOC(sizeof(*entry), M_IFADDR, M_NOWAIT);
1c79356b A	152	if (entry == NULL)
	153	panic("ifmedia_add: can't malloc entry");
	154
	155	entry->ifm_media = mword;
	156	entry->ifm_data = data;
	157	entry->ifm_aux = aux;
	158
	159	LIST_INSERT_HEAD(&ifm->ifm_list, entry, ifm_list);
	160	}
	161
	162	/*
	163	* Add an array of media configurations to the list of
	164	* supported media for a specific interface instance.
	165	*/
	166	void
	167	ifmedia_list_add(ifm, lp, count)
	168	struct ifmedia *ifm;
	169	struct ifmedia_entry *lp;
	170	int count;
	171	{
	172	int i;
	173
	174	for (i = 0; i < count; i++)
	175	ifmedia_add(ifm, lp[i].ifm_media, lp[i].ifm_data,
	176	lp[i].ifm_aux);
	177	}
	178
	179	/*
	180	* Set the default active media.
	181	*
	182	* Called by device-specific code which is assumed to have already
	183	* selected the default media in hardware. We do _not_ call the
	184	* media-change callback.
	185	*/
	186	void
	187	ifmedia_set(ifm, target)
	188	struct ifmedia *ifm;
	189	int target;
	190
	191	{
	192	struct ifmedia_entry *match;
	193
	194	match = ifmedia_match(ifm, target, ifm->ifm_mask);
	195
	196	if (match == NULL) {
	197	printf("ifmedia_set: no match for 0x%x/0x%x\n",
	198	target, ~ifm->ifm_mask);
	199	panic("ifmedia_set");
	200	}
	201	ifm->ifm_cur = match;
	202
	203	#ifdef IFMEDIA_DEBUG
	204	if (ifmedia_debug) {
	205	printf("ifmedia_set: target ");
	206	ifmedia_printword(target);
	207	printf("ifmedia_set: setting to ");
	208	ifmedia_printword(ifm->ifm_cur->ifm_media);
	209	}
	210	#endif
	211	}
	212
	213	/*
	214	* Device-independent media ioctl support function.
	215	*/
216	int
91447636 A	217	ifmedia_ioctl(
	218	struct ifnet *ifp,
	219	struct ifreq *ifr,
	220	struct ifmedia *ifm,
	221	u_long cmd)
1c79356b A	222	{
	223	struct ifmedia_entry *match;
	224	struct ifmediareq ifmr = (struct ifmediareq ) ifr;
	225	int error = 0, sticky;
	226
	227	if (ifp == NULL \|\| ifr == NULL \|\| ifm == NULL)
	228	return(EINVAL);
	229
	230	switch (cmd) {
	231
	232	/*
	233	* Set the current media.
	234	*/
	235	case SIOCSIFMEDIA:
	236	{
	237	struct ifmedia_entry *oldentry;
	238	int oldmedia;
	239	int newmedia = ifr->ifr_media;
	240
	241	match = ifmedia_match(ifm, newmedia, ifm->ifm_mask);
	242	if (match == NULL) {
	243	#ifdef IFMEDIA_DEBUG
	244	if (ifmedia_debug) {
	245	printf(
	246	"ifmedia_ioctl: no media found for 0x%x\n",
	247	newmedia);
	248	}
	249	#endif
	250	return (ENXIO);
	251	}
	252
	253	/*
	254	* If no change, we're done.
	255	* XXX Automedia may invole software intervention.
	256	* Keep going in case the the connected media changed.
	257	* Similarly, if best match changed (kernel debugger?).
	258	*/
	259	if ((IFM_SUBTYPE(newmedia) != IFM_AUTO) &&
	260	(newmedia == ifm->ifm_media) &&
	261	(match == ifm->ifm_cur))
	262	return 0;
	263
	264	/*
	265	* We found a match, now make the driver switch to it.
	266	* Make sure to preserve our old media type in case the
	267	* driver can't switch.
	268	*/
	269	#ifdef IFMEDIA_DEBUG
	270	if (ifmedia_debug) {
	271	printf("ifmedia_ioctl: switching %s to ",
	272	ifp->if_xname);
	273	ifmedia_printword(match->ifm_media);
	274	}
	275	#endif
	276	oldentry = ifm->ifm_cur;
	277	oldmedia = ifm->ifm_media;
	278	ifm->ifm_cur = match;
	279	ifm->ifm_media = newmedia;
	280	error = (*ifm->ifm_change)(ifp);
	281	if (error) {
	282	ifm->ifm_cur = oldentry;
	283	ifm->ifm_media = oldmedia;
	284	}
	285	break;
286	}
287
288	/*
289	* Get list of available media and current media on interface.
290	*/
291	case SIOCGIFMEDIA:
292	{
293	struct ifmedia_entry *ep;
294	int *kptr, count;
9bccf70c	295	int usermax; /* user requested max */
1c79356b A	296
	297	kptr = NULL; /* XXX gcc */
	298
	299	ifmr->ifm_active = ifmr->ifm_current = ifm->ifm_cur ?
	300	ifm->ifm_cur->ifm_media : IFM_NONE;
	301	ifmr->ifm_mask = ifm->ifm_mask;
	302	ifmr->ifm_status = 0;
	303	(*ifm->ifm_status)(ifp, ifmr);
	304
	305	count = 0;
9bccf70c A	306	usermax = 0;
	307
	308	/*
	309	* If there are more interfaces on the list, count
	310	* them. This allows the caller to set ifmr->ifm_count
	311	* to 0 on the first call to know how much space to
	312	* allocate.
	313	*/
	314	LIST_FOREACH(ep, &ifm->ifm_list, ifm_list)
	315	usermax++;
	316
	317	/*
	318	* Don't allow the user to ask for too many
	319	* or a negative number.
	320	*/
	321	if (ifmr->ifm_count > usermax)
	322	ifmr->ifm_count = usermax;
	323	else if (ifmr->ifm_count < 0)
	324	return (EINVAL);
1c79356b A	325
	326	if (ifmr->ifm_count != 0) {
	327	kptr = (int ) _MALLOC(ifmr->ifm_count sizeof(int),
	328	M_TEMP, M_WAITOK);
	329
	330	/*
	331	* Get the media words from the interface's list.
	332	*/
9bccf70c	333	ep = LIST_FIRST(&ifm->ifm_list);
1c79356b	334	for (; ep != NULL && count < ifmr->ifm_count;
9bccf70c	335	ep = LIST_NEXT(ep, ifm_list), count++)
1c79356b A	336	kptr[count] = ep->ifm_media;
	337
	338	if (ep != NULL)
	339	error = E2BIG; /* oops! */
9bccf70c A	340	} else {
9bccf70c A	341	count = usermax;
1c79356b A	342	}
1c79356b A	343
1c79356b A	344	/*
	345	* We do the copyout on E2BIG, because that's
	346	* just our way of telling userland that there
	347	* are more. This is the behavior I've observed
	348	* under BSD/OS 3.0
	349	*/
	350	sticky = error;
	351	if ((error == 0 \|\| error == E2BIG) && ifmr->ifm_count != 0) {
	352	error = copyout((caddr_t)kptr,
91447636	353	CAST_USER_ADDR_T(ifmr->ifm_ulist),
1c79356b A	354	ifmr->ifm_count * sizeof(int));
	355	}
	356
	357	if (error == 0)
	358	error = sticky;
	359
	360	if (ifmr->ifm_count != 0)
	361	FREE(kptr, M_TEMP);
	362
	363	ifmr->ifm_count = count;
	364	break;
	365	}
	366
	367	default:
	368	return (EINVAL);
	369	}
	370
	371	return (error);
	372	}
	373
	374	/*
	375	* Find media entry matching a given ifm word.
	376	*
	377	*/
	378	static struct ifmedia_entry *
	379	ifmedia_match(ifm, target, mask)
	380	struct ifmedia *ifm;
	381	int target;
	382	int mask;
	383	{
	384	struct ifmedia_entry match, next;
	385
	386	match = NULL;
	387	mask = ~mask;
	388
9bccf70c	389	LIST_FOREACH(next, &ifm->ifm_list, ifm_list) {
1c79356b A	390	if ((next->ifm_media & mask) == (target & mask)) {
	391	#if defined(IFMEDIA_DEBUG) \|\| defined(DIAGNOSTIC)
	392	if (match) {
	393	printf("ifmedia_match: multiple match for "
	394	"0x%x/0x%x\n", target, mask);
	395	}
	396	#endif
	397	match = next;
	398	}
	399	}
	400
	401	return match;
	402	}
	403
	404	#ifdef IFMEDIA_DEBUG
	405	struct ifmedia_description ifm_type_descriptions[] =
	406	IFM_TYPE_DESCRIPTIONS;
	407
	408	struct ifmedia_description ifm_subtype_ethernet_descriptions[] =
	409	IFM_SUBTYPE_ETHERNET_DESCRIPTIONS;
	410
	411	struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] =
	412	IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS;
	413
	414	struct ifmedia_description ifm_subtype_tokenring_descriptions[] =
	415	IFM_SUBTYPE_TOKENRING_DESCRIPTIONS;
	416
	417	struct ifmedia_description ifm_subtype_tokenring_option_descriptions[] =
	418	IFM_SUBTYPE_TOKENRING_OPTION_DESCRIPTIONS;
	419
	420	struct ifmedia_description ifm_subtype_fddi_descriptions[] =
	421	IFM_SUBTYPE_FDDI_DESCRIPTIONS;
	422
	423	struct ifmedia_description ifm_subtype_fddi_option_descriptions[] =
	424	IFM_SUBTYPE_FDDI_OPTION_DESCRIPTIONS;
	425
	426	struct ifmedia_description ifm_subtype_80211_descriptions[] =
	427	IFM_SUBTYPE_IEEE80211_DESCRIPTIONS;
	428
	429	struct ifmedia_description ifm_subtype_80211_option_descriptions[] =
	430	IFM_SUBTYPE_IEEE80211_OPTION_DESCRIPTIONS;
	431
	432	struct ifmedia_description ifm_subtype_shared_descriptions[] =
	433	IFM_SUBTYPE_SHARED_DESCRIPTIONS;
	434
	435	struct ifmedia_description ifm_shared_option_descriptions[] =
	436	IFM_SHARED_OPTION_DESCRIPTIONS;
	437
	438	struct ifmedia_type_to_subtype {
	439	struct ifmedia_description *subtypes;
	440	struct ifmedia_description *options;
	441	};
	442
	443	/* must be in the same order as IFM_TYPE_DESCRIPTIONS */
	444	struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = {
	445	{
	446	&ifm_subtype_ethernet_descriptions[0],
	447	&ifm_subtype_ethernet_option_descriptions[0]
	448	},
	449	{
	450	&ifm_subtype_tokenring_descriptions[0],
	451	&ifm_subtype_tokenring_option_descriptions[0]
	452	},
	453	{
454	&ifm_subtype_fddi_descriptions[0],
455	&ifm_subtype_fddi_option_descriptions[0]
456	},
457	{
458	&ifm_subtype_80211_descriptions[0],
459	&ifm_subtype_80211_option_descriptions[0]
460	},
461	};
462
463	/*
464	* print a media word.
465	*/
466	static void
467	ifmedia_printword(ifmw)
468	int ifmw;
469	{
470	struct ifmedia_description *desc;
471	struct ifmedia_type_to_subtype *ttos;
472	int seen_option = 0;
473
474	/* Find the top-level interface type. */
475	for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
476	desc->ifmt_string != NULL; desc++, ttos++)
477	if (IFM_TYPE(ifmw) == desc->ifmt_word)
478	break;
479	if (desc->ifmt_string == NULL) {
480	printf("<unknown type>\n");
481	return;
482	}
483	printf(desc->ifmt_string);
484
485	/*
486	* Check for the shared subtype descriptions first, then the
487	* type-specific ones.
488	*/
489	for (desc = ifm_subtype_shared_descriptions;
490	desc->ifmt_string != NULL; desc++)
491	if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
492	goto got_subtype;
493
494	for (desc = ttos->subtypes; desc->ifmt_string != NULL; desc++)
495	if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
496	break;
497	if (desc->ifmt_string == NULL) {
498	printf(" <unknown subtype>\n");
499	return;
500	}
501
502	got_subtype:
503	printf(" %s", desc->ifmt_string);
504
505	/*
506	* Look for shared options.
507	*/
508	for (desc = ifm_shared_option_descriptions;
509	desc->ifmt_string != NULL; desc++) {
510	if (ifmw & desc->ifmt_word) {
511	if (seen_option == 0)
512	printf(" <");
513	printf("%s%s", seen_option++ ? "," : "",
514	desc->ifmt_string);
515	}
516	}
517
518	/*
519	* Look for subtype-specific options.
520	*/
521	for (desc = ttos->options; desc->ifmt_string != NULL; desc++) {
522	if (ifmw & desc->ifmt_word) {
523	if (seen_option == 0)
524	printf(" <");
525	printf("%s%s", seen_option++ ? "," : "",
526	desc->ifmt_string);
527	}
528	}
529	printf("%s\n", seen_option ? ">" : "");
530	}
531	#endif /* IFMEDIA_DEBUG */