[deliverable/linux.git] / net / ieee80211 / ieee80211_geo.c

/******************************************************************************

  Copyright(c) 2005 Intel Corporation. All rights reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc., 59
  Temple Place - Suite 330, Boston, MA  02111-1307, USA.

  The full GNU General Public License is included in this distribution in the
  file called LICENSE.

  Contact Information:
  James P. Ketrenos <ipw2100-admin@linux.intel.com>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

******************************************************************************/
#include <linux/compiler.h>
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <linux/types.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <asm/uaccess.h>

#include <net/ieee80211.h>

int ieee80211_is_valid_channel(struct ieee80211_device *ieee, u8 channel)
{
	int i;

	/* Driver needs to initialize the geography map before using
	 * these helper functions */
	BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);

	if (ieee->freq_band & IEEE80211_24GHZ_BAND)
		for (i = 0; i < ieee->geo.bg_channels; i++)
			/* NOTE: If G mode is currently supported but
			 * this is a B only channel, we don't see it
			 * as valid. */
			if ((ieee->geo.bg[i].channel == channel) &&
			    !(ieee->geo.bg[i].flags & IEEE80211_CH_INVALID) &&
			    (!(ieee->mode & IEEE_G) ||
			     !(ieee->geo.bg[i].flags & IEEE80211_CH_B_ONLY)))
				return IEEE80211_24GHZ_BAND;

	if (ieee->freq_band & IEEE80211_52GHZ_BAND)
		for (i = 0; i < ieee->geo.a_channels; i++)
			if ((ieee->geo.a[i].channel == channel) &&
			    !(ieee->geo.a[i].flags & IEEE80211_CH_INVALID))
				return IEEE80211_52GHZ_BAND;

	return 0;
}

int ieee80211_channel_to_index(struct ieee80211_device *ieee, u8 channel)
{
	int i;

	/* Driver needs to initialize the geography map before using
	 * these helper functions */
	BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);

	if (ieee->freq_band & IEEE80211_24GHZ_BAND)
		for (i = 0; i < ieee->geo.bg_channels; i++)
			if (ieee->geo.bg[i].channel == channel)
				return i;

	if (ieee->freq_band & IEEE80211_52GHZ_BAND)
		for (i = 0; i < ieee->geo.a_channels; i++)
			if (ieee->geo.a[i].channel == channel)
				return i;

	return -1;
}

u8 ieee80211_freq_to_channel(struct ieee80211_device * ieee, u32 freq)
{
	int i;

	/* Driver needs to initialize the geography map before using
	 * these helper functions */
	BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);

	freq /= 100000;

	if (ieee->freq_band & IEEE80211_24GHZ_BAND)
		for (i = 0; i < ieee->geo.bg_channels; i++)
			if (ieee->geo.bg[i].freq == freq)
				return ieee->geo.bg[i].channel;

	if (ieee->freq_band & IEEE80211_52GHZ_BAND)
		for (i = 0; i < ieee->geo.a_channels; i++)
			if (ieee->geo.a[i].freq == freq)
				return ieee->geo.a[i].channel;

	return 0;
}

int ieee80211_set_geo(struct ieee80211_device *ieee,
		      const struct ieee80211_geo *geo)
{
	memcpy(ieee->geo.name, geo->name, 3);
	ieee->geo.name[3] = '\0';
	ieee->geo.bg_channels = geo->bg_channels;
	ieee->geo.a_channels = geo->a_channels;
	memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
	       sizeof(struct ieee80211_channel));
	memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
	       sizeof(struct ieee80211_channel));
	return 0;
}

const struct ieee80211_geo *ieee80211_get_geo(struct ieee80211_device *ieee)
{
	return &ieee->geo;
}

u8 ieee80211_get_channel_flags(struct ieee80211_device * ieee, u8 channel)
{
	int index = ieee80211_channel_to_index(ieee, channel);

	if (index == -1)
		return IEEE80211_CH_INVALID;

	if (channel <= IEEE80211_24GHZ_CHANNELS)
		return ieee->geo.bg[index].flags;

	return ieee->geo.a[index].flags;
}

static const struct ieee80211_channel bad_channel = {
	.channel = 0,
	.flags = IEEE80211_CH_INVALID,
	.max_power = 0,
};

const struct ieee80211_channel *ieee80211_get_channel(struct ieee80211_device
						      *ieee, u8 channel)
{
	int index = ieee80211_channel_to_index(ieee, channel);

	if (index == -1)
		return &bad_channel;

	if (channel <= IEEE80211_24GHZ_CHANNELS)
		return &ieee->geo.bg[index];

	return &ieee->geo.a[index];
}

EXPORT_SYMBOL(ieee80211_get_channel);
EXPORT_SYMBOL(ieee80211_get_channel_flags);
EXPORT_SYMBOL(ieee80211_is_valid_channel);
EXPORT_SYMBOL(ieee80211_freq_to_channel);
EXPORT_SYMBOL(ieee80211_channel_to_index);
EXPORT_SYMBOL(ieee80211_set_geo);
EXPORT_SYMBOL(ieee80211_get_geo);
Commit	Line	Data
02cda6ae JK	1	/******************************************************************************
	2
	3	Copyright(c) 2005 Intel Corporation. All rights reserved.
	4
	5	This program is free software; you can redistribute it and/or modify it
	6	under the terms of version 2 of the GNU General Public License as
	7	published by the Free Software Foundation.
	8
	9	This program is distributed in the hope that it will be useful, but WITHOUT
	10	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	more details.
	13
	14	You should have received a copy of the GNU General Public License along with
	15	this program; if not, write to the Free Software Foundation, Inc., 59
	16	Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	17
	18	The full GNU General Public License is included in this distribution in the
	19	file called LICENSE.
	20
	21	Contact Information:
	22	James P. Ketrenos <ipw2100-admin@linux.intel.com>
	23	Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	24
	25	******************************************************************************/
	26	#include <linux/compiler.h>
	27	#include <linux/config.h>
	28	#include <linux/errno.h>
	29	#include <linux/if_arp.h>
	30	#include <linux/in6.h>
	31	#include <linux/in.h>
	32	#include <linux/ip.h>
	33	#include <linux/kernel.h>
	34	#include <linux/module.h>
	35	#include <linux/netdevice.h>
	36	#include <linux/proc_fs.h>
	37	#include <linux/skbuff.h>
	38	#include <linux/slab.h>
	39	#include <linux/tcp.h>
	40	#include <linux/types.h>
02cda6ae JK	41	#include <linux/wireless.h>
	42	#include <linux/etherdevice.h>
	43	#include <asm/uaccess.h>
	44
	45	#include <net/ieee80211.h>
	46
	47	int ieee80211_is_valid_channel(struct ieee80211_device *ieee, u8 channel)
	48	{
	49	int i;
	50
	51	/* Driver needs to initialize the geography map before using
	52	* these helper functions */
	53	BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
	54
	55	if (ieee->freq_band & IEEE80211_24GHZ_BAND)
	56	for (i = 0; i < ieee->geo.bg_channels; i++)
	57	/* NOTE: If G mode is currently supported but
	58	* this is a B only channel, we don't see it
	59	* as valid. */
	60	if ((ieee->geo.bg[i].channel == channel) &&
d128f6c1	61	!(ieee->geo.bg[i].flags & IEEE80211_CH_INVALID) &&
02cda6ae JK	62	(!(ieee->mode & IEEE_G) \|\|
	63	!(ieee->geo.bg[i].flags & IEEE80211_CH_B_ONLY)))
	64	return IEEE80211_24GHZ_BAND;
	65
	66	if (ieee->freq_band & IEEE80211_52GHZ_BAND)
	67	for (i = 0; i < ieee->geo.a_channels; i++)
d128f6c1 ZY	68	if ((ieee->geo.a[i].channel == channel) &&
d128f6c1 ZY	69	!(ieee->geo.a[i].flags & IEEE80211_CH_INVALID))
02cda6ae JK	70	return IEEE80211_52GHZ_BAND;
	71
	72	return 0;
	73	}
	74
	75	int ieee80211_channel_to_index(struct ieee80211_device *ieee, u8 channel)
	76	{
	77	int i;
	78
	79	/* Driver needs to initialize the geography map before using
	80	* these helper functions */
	81	BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
	82
	83	if (ieee->freq_band & IEEE80211_24GHZ_BAND)
	84	for (i = 0; i < ieee->geo.bg_channels; i++)
	85	if (ieee->geo.bg[i].channel == channel)
	86	return i;
	87
	88	if (ieee->freq_band & IEEE80211_52GHZ_BAND)
	89	for (i = 0; i < ieee->geo.a_channels; i++)
	90	if (ieee->geo.a[i].channel == channel)
	91	return i;
	92
	93	return -1;
	94	}
	95
	96	u8 ieee80211_freq_to_channel(struct ieee80211_device * ieee, u32 freq)
	97	{
	98	int i;
	99
	100	/* Driver needs to initialize the geography map before using
	101	* these helper functions */
	102	BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
	103
	104	freq /= 100000;
	105
	106	if (ieee->freq_band & IEEE80211_24GHZ_BAND)
	107	for (i = 0; i < ieee->geo.bg_channels; i++)
	108	if (ieee->geo.bg[i].freq == freq)
	109	return ieee->geo.bg[i].channel;
	110
	111	if (ieee->freq_band & IEEE80211_52GHZ_BAND)
	112	for (i = 0; i < ieee->geo.a_channels; i++)
	113	if (ieee->geo.a[i].freq == freq)
	114	return ieee->geo.a[i].channel;
	115
	116	return 0;
	117	}
	118
	119	int ieee80211_set_geo(struct ieee80211_device *ieee,
	120	const struct ieee80211_geo *geo)
	121	{
	122	memcpy(ieee->geo.name, geo->name, 3);
	123	ieee->geo.name[3] = '\0';
	124	ieee->geo.bg_channels = geo->bg_channels;
	125	ieee->geo.a_channels = geo->a_channels;
	126	memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
	127	sizeof(struct ieee80211_channel));
	128	memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
	129	sizeof(struct ieee80211_channel));
	130	return 0;
	131	}
	132
	133	const struct ieee80211_geo ieee80211_get_geo(struct ieee80211_device ieee)
134	{
135	return &ieee->geo;
136	}
137
d128f6c1 ZY	138	u8 ieee80211_get_channel_flags(struct ieee80211_device * ieee, u8 channel)
	139	{
	140	int index = ieee80211_channel_to_index(ieee, channel);
	141
	142	if (index == -1)
	143	return IEEE80211_CH_INVALID;
	144
	145	if (channel <= IEEE80211_24GHZ_CHANNELS)
	146	return ieee->geo.bg[index].flags;
	147
	148	return ieee->geo.a[index].flags;
	149	}
	150
	151	static const struct ieee80211_channel bad_channel = {
	152	.channel = 0,
	153	.flags = IEEE80211_CH_INVALID,
	154	.max_power = 0,
	155	};
	156
	157	const struct ieee80211_channel *ieee80211_get_channel(struct ieee80211_device
	158	*ieee, u8 channel)
	159	{
	160	int index = ieee80211_channel_to_index(ieee, channel);
	161
	162	if (index == -1)
	163	return &bad_channel;
	164
	165	if (channel <= IEEE80211_24GHZ_CHANNELS)
	166	return &ieee->geo.bg[index];
	167
	168	return &ieee->geo.a[index];
	169	}
	170
	171	EXPORT_SYMBOL(ieee80211_get_channel);
	172	EXPORT_SYMBOL(ieee80211_get_channel_flags);
02cda6ae JK	173	EXPORT_SYMBOL(ieee80211_is_valid_channel);
	174	EXPORT_SYMBOL(ieee80211_freq_to_channel);
	175	EXPORT_SYMBOL(ieee80211_channel_to_index);
	176	EXPORT_SYMBOL(ieee80211_set_geo);
	177	EXPORT_SYMBOL(ieee80211_get_geo);