[thirdparty/hostap.git] / hostapd / hw_features.c

/*
 * hostapd / Hardware feature query and different modes
 * Copyright 2002-2003, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "hostapd.h"
#include "hw_features.h"
#include "driver.h"
#include "config.h"
#include "eloop.h"


void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
			      size_t num_hw_features)
{
	size_t i;

	if (hw_features == NULL)
		return;

	for (i = 0; i < num_hw_features; i++) {
		os_free(hw_features[i].channels);
		os_free(hw_features[i].rates);
	}

	os_free(hw_features);
}


int hostapd_get_hw_features(struct hostapd_iface *iface)
{
	struct hostapd_data *hapd = iface->bss[0];
	int ret = 0, i, j;
	u16 num_modes, flags;
	struct hostapd_hw_modes *modes;

	if (hostapd_drv_none(hapd))
		return -1;
	modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags);
	if (modes == NULL) {
		hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_DEBUG,
			       "Fetching hardware channel/rate support not "
			       "supported.");
		return -1;
	}

	iface->hw_flags = flags;

	hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
	iface->hw_features = modes;
	iface->num_hw_features = num_modes;

	for (i = 0; i < num_modes; i++) {
		struct hostapd_hw_modes *feature = &modes[i];
		/* set flag for channels we can use in current regulatory
		 * domain */
		for (j = 0; j < feature->num_channels; j++) {
			/* TODO: add regulatory domain lookup */
			unsigned char power_level = 0;
			unsigned char antenna_max = 0;

			if ((feature->mode == HOSTAPD_MODE_IEEE80211G ||
			     feature->mode == HOSTAPD_MODE_IEEE80211B) &&
			    feature->channels[j].chan >= 1 &&
			    feature->channels[j].chan <= 11) {
				power_level = 20;
				feature->channels[j].flag |=
					HOSTAPD_CHAN_W_SCAN;
			} else
				feature->channels[j].flag &=
					~HOSTAPD_CHAN_W_SCAN;

			hostapd_set_channel_flag(hapd, feature->mode,
						 feature->channels[j].chan,
						 feature->channels[j].flag,
						 power_level,
						 antenna_max);
		}
	}

	return ret;
}


static int hostapd_prepare_rates(struct hostapd_data *hapd,
				 struct hostapd_hw_modes *mode)
{
	int i, num_basic_rates = 0;
	int basic_rates_a[] = { 60, 120, 240, -1 };
	int basic_rates_b[] = { 10, 20, -1 };
	int basic_rates_g[] = { 10, 20, 55, 110, -1 };
	int *basic_rates;

	if (hapd->iconf->basic_rates)
		basic_rates = hapd->iconf->basic_rates;
	else switch (mode->mode) {
	case HOSTAPD_MODE_IEEE80211A:
		basic_rates = basic_rates_a;
		break;
	case HOSTAPD_MODE_IEEE80211B:
		basic_rates = basic_rates_b;
		break;
	case HOSTAPD_MODE_IEEE80211G:
		basic_rates = basic_rates_g;
		break;
	default:
		return -1;
	}

	if (hostapd_set_rate_sets(hapd, hapd->iconf->supported_rates,
				  basic_rates, mode->mode)) {
		wpa_printf(MSG_ERROR, "Failed to update rate sets in kernel "
			   "module");
	}

	os_free(hapd->iface->current_rates);
	hapd->iface->num_rates = 0;

	hapd->iface->current_rates =
		os_malloc(mode->num_rates * sizeof(struct hostapd_rate_data));
	if (!hapd->iface->current_rates) {
		wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
			   "table.");
		return -1;
	}

	for (i = 0; i < mode->num_rates; i++) {
		struct hostapd_rate_data *rate;

		if (hapd->iconf->supported_rates &&
		    !hostapd_rate_found(hapd->iconf->supported_rates,
					mode->rates[i].rate))
			continue;

		rate = &hapd->iface->current_rates[hapd->iface->num_rates];
		os_memcpy(rate, &mode->rates[i],
			  sizeof(struct hostapd_rate_data));
		if (hostapd_rate_found(basic_rates, rate->rate)) {
			rate->flags |= HOSTAPD_RATE_BASIC;
			num_basic_rates++;
		} else
			rate->flags &= ~HOSTAPD_RATE_BASIC;
		wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
			   hapd->iface->num_rates, rate->rate, rate->flags);
		hapd->iface->num_rates++;
	}

	if (hapd->iface->num_rates == 0 || num_basic_rates == 0) {
		wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
			   "rate sets (%d,%d).",
			   hapd->iface->num_rates, num_basic_rates);
		return -1;
	}

	return 0;
}


static void select_hw_mode_start(void *eloop_data, void *user_ctx);
static void select_hw_mode2_handler(void *eloop_data, void *user_ctx);

/**
 * select_hw_mode_finalize - Finish select HW mode & call the callback
 * @iface: Pointer to interface data.
 * @status: Status of the select HW mode (0 on success; -1 on failure).
 * Returns: 0 on success; -1 on failure (e.g., was not in progress).
 */
static int select_hw_mode_finalize(struct hostapd_iface *iface, int status)
{
	hostapd_iface_cb cb;

	if (!iface->hw_mode_sel_cb)
		return -1;

	eloop_cancel_timeout(select_hw_mode_start, iface, NULL);
	eloop_cancel_timeout(select_hw_mode2_handler, iface, NULL);

	cb = iface->hw_mode_sel_cb;

	iface->hw_mode_sel_cb = NULL;

	cb(iface, status);

	return 0;
}


/**
 * select_hw_mode2 - Select the hardware mode (part 2)
 * @iface: Pointer to interface data.
 * @status: Status of auto chanel selection.
 *
 * Setup the rates and passive scanning based on the configuration.
 */
static void select_hw_mode2(struct hostapd_iface *iface, int status)
{
	int ret = status;
	if (ret)
		goto fail;

	if (iface->current_mode == NULL) {
		hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_WARNING,
			       "Hardware does not support configured channel");
		ret = -1;
		goto fail;
	}

	if (hostapd_prepare_rates(iface->bss[0], iface->current_mode)) {
		wpa_printf(MSG_ERROR, "Failed to prepare rates table.");
		hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
					   HOSTAPD_LEVEL_WARNING,
					   "Failed to prepare rates table.");
		ret = -1;
		goto fail;
	}

	ret = hostapd_passive_scan(iface->bss[0], 0,
				   iface->conf->passive_scan_mode,
				   iface->conf->passive_scan_interval,
				   iface->conf->passive_scan_listen,
				   NULL, NULL);
	if (ret) {
		wpa_printf(MSG_ERROR, "Could not set passive scanning: %s",
			   strerror(ret));
		ret = 0;
	}

fail:
	select_hw_mode_finalize(iface, ret);
}


/**
 * select_hw_mode2_handler - Calls select_hw_mode2 when auto chan isn't used
 * @eloop_data: Stores the struct hostapd_iface * for the interface.
 * @user_ctx: Unused.
 */
static void select_hw_mode2_handler(void *eloop_data, void *user_ctx)
{
	struct hostapd_iface *iface = eloop_data;

	select_hw_mode2(iface, 0);
}


/**
 * select_hw_mode1 - Select the hardware mode (part 1)
 * @iface: Pointer to interface data.
 * Returns: 0 on success; -1 on failure.
 *
 * Setup the hardware mode and channel based on the configuration.
 * Schedules select_hw_mode2() to be called immediately or after automatic
 * channel selection takes place.
 */
static int select_hw_mode1(struct hostapd_iface *iface)
{
	int i, j, ok;

	if (iface->num_hw_features < 1)
		return -1;

	iface->current_mode = NULL;
	for (i = 0; i < iface->num_hw_features; i++) {
		struct hostapd_hw_modes *mode = &iface->hw_features[i];
		if (mode->mode == (int) iface->conf->hw_mode) {
			iface->current_mode = mode;
			break;
		}
	}

	if (iface->current_mode == NULL) {
		wpa_printf(MSG_ERROR, "Hardware does not support configured "
			   "mode");
		hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_WARNING,
			       "Hardware does not support configured mode "
			       "(%d)", (int) iface->conf->hw_mode);
		return -1;
	}

	ok = 0;
	for (j = 0; j < iface->current_mode->num_channels; j++) {
		struct hostapd_channel_data *chan =
			&iface->current_mode->channels[j];
		if ((chan->flag & HOSTAPD_CHAN_W_SCAN) &&
		    (chan->chan == iface->conf->channel)) {
			ok = 1;
			break;
		}
	}
	if (ok == 0 && iface->conf->channel != 0) {
		hostapd_logger(iface->bss[0], NULL,
			       HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_WARNING,
			       "Configured channel (%d) not found from the "
			       "channel list of current mode (%d) %s",
			       iface->conf->channel,
			       iface->current_mode->mode,
			       hostapd_hw_mode_txt(iface->current_mode->mode));
		iface->current_mode = NULL;
	}

	/*
	 * Calls select_hw_mode2() via a handler, so that the function is
	 * always executed from eloop.
	 */
	eloop_register_timeout(0, 0, select_hw_mode2_handler, iface, NULL);
	return 0;
}


/**
 * select_hw_mode_start - Handler to start select HW mode
 * @eloop_data: Stores the struct hostapd_iface * for the interface.
 * @user_ctx: Unused.
 *
 * An eloop handler is used so that all errors can be processed by the
 * callback without introducing stack recursion.
 */
static void select_hw_mode_start(void *eloop_data, void *user_ctx)
{
	struct hostapd_iface *iface = (struct hostapd_iface *)eloop_data;

	int ret;

	ret = select_hw_mode1(iface);
	if (ret)
		select_hw_mode_finalize(iface, ret);
}


/**
 * hostapd_select_hw_mode_start - Start selection of the hardware mode
 * @iface: Pointer to interface data.
 * @cb: The function to callback when done.
 * Returns:  0 if it starts successfully; cb will be called when done.
 *          -1 on failure; cb will not be called.
 *
 * Sets up the hardware mode, channel, rates, and passive scanning
 * based on the configuration.
 */
int hostapd_select_hw_mode_start(struct hostapd_iface *iface,
				 hostapd_iface_cb cb)
{
	if (iface->hw_mode_sel_cb) {
		wpa_printf(MSG_DEBUG,
			   "%s: Hardware mode select already in progress.",
			   iface->bss[0]->conf->iface);
		return -1;
	}

	iface->hw_mode_sel_cb = cb;

	eloop_register_timeout(0, 0, select_hw_mode_start, iface, NULL);

	return 0;
}


/**
 * hostapd_auto_chan_select_stop - Stops automatic channel selection
 * @iface: Pointer to interface data.
 * Returns:  0 if successfully stopped;
 *          -1 on failure (i.e., was not in progress)
 */
int hostapd_select_hw_mode_stop(struct hostapd_iface *iface)
{
	return select_hw_mode_finalize(iface, -1);
}


const char * hostapd_hw_mode_txt(int mode)
{
	switch (mode) {
	case HOSTAPD_MODE_IEEE80211A:
		return "IEEE 802.11a";
	case HOSTAPD_MODE_IEEE80211B:
		return "IEEE 802.11b";
	case HOSTAPD_MODE_IEEE80211G:
		return "IEEE 802.11g";
	default:
		return "UNKNOWN";
	}
}


int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
{
	int i;

	if (!hapd->iface->current_mode)
		return 0;

	for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
		struct hostapd_channel_data *ch =
			&hapd->iface->current_mode->channels[i];
		if (ch->chan == chan)
			return ch->freq;
	}

	return 0;
}


int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
{
	int i;

	if (!hapd->iface->current_mode)
		return 0;

	for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
		struct hostapd_channel_data *ch =
			&hapd->iface->current_mode->channels[i];
		if (ch->freq == freq)
			return ch->chan;
	}

	return 0;
}
Commit	Line	Data
6fc6879b JM	1	/*
	2	* hostapd / Hardware feature query and different modes
	3	* Copyright 2002-2003, Instant802 Networks, Inc.
	4	* Copyright 2005-2006, Devicescape Software, Inc.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* Alternatively, this software may be distributed under the terms of BSD
	11	* license.
	12	*
	13	* See README and COPYING for more details.
	14	*/
	15
	16	#include "includes.h"
	17
	18	#include "hostapd.h"
	19	#include "hw_features.h"
	20	#include "driver.h"
	21	#include "config.h"
	22	#include "eloop.h"
	23
	24
	25	void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
	26	size_t num_hw_features)
	27	{
	28	size_t i;
	29
	30	if (hw_features == NULL)
	31	return;
	32
	33	for (i = 0; i < num_hw_features; i++) {
	34	os_free(hw_features[i].channels);
	35	os_free(hw_features[i].rates);
	36	}
	37
	38	os_free(hw_features);
	39	}
	40
	41
	42	int hostapd_get_hw_features(struct hostapd_iface *iface)
	43	{
	44	struct hostapd_data *hapd = iface->bss[0];
	45	int ret = 0, i, j;
	46	u16 num_modes, flags;
	47	struct hostapd_hw_modes *modes;
	48
85141289 JM	49	if (hostapd_drv_none(hapd))
85141289 JM	50	return -1;
6fc6879b JM	51	modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags);
	52	if (modes == NULL) {
	53	hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
	54	HOSTAPD_LEVEL_DEBUG,
	55	"Fetching hardware channel/rate support not "
	56	"supported.");
	57	return -1;
	58	}
	59
	60	iface->hw_flags = flags;
	61
	62	hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
	63	iface->hw_features = modes;
	64	iface->num_hw_features = num_modes;
	65
	66	for (i = 0; i < num_modes; i++) {
	67	struct hostapd_hw_modes *feature = &modes[i];
	68	/* set flag for channels we can use in current regulatory
	69	* domain */
	70	for (j = 0; j < feature->num_channels; j++) {
	71	/* TODO: add regulatory domain lookup */
	72	unsigned char power_level = 0;
	73	unsigned char antenna_max = 0;
	74
	75	if ((feature->mode == HOSTAPD_MODE_IEEE80211G \|\|
	76	feature->mode == HOSTAPD_MODE_IEEE80211B) &&
	77	feature->channels[j].chan >= 1 &&
	78	feature->channels[j].chan <= 11) {
	79	power_level = 20;
	80	feature->channels[j].flag \|=
	81	HOSTAPD_CHAN_W_SCAN;
	82	} else
	83	feature->channels[j].flag &=
	84	~HOSTAPD_CHAN_W_SCAN;
	85
	86	hostapd_set_channel_flag(hapd, feature->mode,
	87	feature->channels[j].chan,
	88	feature->channels[j].flag,
	89	power_level,
	90	antenna_max);
	91	}
	92	}
	93
	94	return ret;
	95	}
	96
	97
	98	static int hostapd_prepare_rates(struct hostapd_data *hapd,
	99	struct hostapd_hw_modes *mode)
	100	{
	101	int i, num_basic_rates = 0;
	102	int basic_rates_a[] = { 60, 120, 240, -1 };
	103	int basic_rates_b[] = { 10, 20, -1 };
	104	int basic_rates_g[] = { 10, 20, 55, 110, -1 };
	105	int *basic_rates;
	106
	107	if (hapd->iconf->basic_rates)
	108	basic_rates = hapd->iconf->basic_rates;
	109	else switch (mode->mode) {
	110	case HOSTAPD_MODE_IEEE80211A:
	111	basic_rates = basic_rates_a;
	112	break;
	113	case HOSTAPD_MODE_IEEE80211B:
	114	basic_rates = basic_rates_b;
115	break;
116	case HOSTAPD_MODE_IEEE80211G:
117	basic_rates = basic_rates_g;
118	break;
119	default:
120	return -1;
121	}
122
123	if (hostapd_set_rate_sets(hapd, hapd->iconf->supported_rates,
124	basic_rates, mode->mode)) {
125	wpa_printf(MSG_ERROR, "Failed to update rate sets in kernel "
126	"module");
127	}
128
129	os_free(hapd->iface->current_rates);
130	hapd->iface->num_rates = 0;
131
132	hapd->iface->current_rates =
133	os_malloc(mode->num_rates * sizeof(struct hostapd_rate_data));
134	if (!hapd->iface->current_rates) {
135	wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
136	"table.");
137	return -1;
138	}
139
140	for (i = 0; i < mode->num_rates; i++) {
141	struct hostapd_rate_data *rate;
142
143	if (hapd->iconf->supported_rates &&
144	!hostapd_rate_found(hapd->iconf->supported_rates,
145	mode->rates[i].rate))
146	continue;
147
148	rate = &hapd->iface->current_rates[hapd->iface->num_rates];
149	os_memcpy(rate, &mode->rates[i],
150	sizeof(struct hostapd_rate_data));
151	if (hostapd_rate_found(basic_rates, rate->rate)) {
152	rate->flags \|= HOSTAPD_RATE_BASIC;
153	num_basic_rates++;
154	} else
155	rate->flags &= ~HOSTAPD_RATE_BASIC;
156	wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
157	hapd->iface->num_rates, rate->rate, rate->flags);
158	hapd->iface->num_rates++;
159	}
160
161	if (hapd->iface->num_rates == 0 \|\| num_basic_rates == 0) {
162	wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
163	"rate sets (%d,%d).",
164	hapd->iface->num_rates, num_basic_rates);
165	return -1;
166	}
167
168	return 0;
169	}
170
171
172	static void select_hw_mode_start(void eloop_data, void user_ctx);
173	static void select_hw_mode2_handler(void eloop_data, void user_ctx);
174
175	/**
176	* select_hw_mode_finalize - Finish select HW mode & call the callback
177	* @iface: Pointer to interface data.
178	* @status: Status of the select HW mode (0 on success; -1 on failure).
179	* Returns: 0 on success; -1 on failure (e.g., was not in progress).
180	*/
181	static int select_hw_mode_finalize(struct hostapd_iface *iface, int status)
182	{
183	hostapd_iface_cb cb;
184
185	if (!iface->hw_mode_sel_cb)
186	return -1;
187
188	eloop_cancel_timeout(select_hw_mode_start, iface, NULL);
189	eloop_cancel_timeout(select_hw_mode2_handler, iface, NULL);
190
191	cb = iface->hw_mode_sel_cb;
192
193	iface->hw_mode_sel_cb = NULL;
194
195	cb(iface, status);
196
197	return 0;
198	}
199
200
201	/**
202	* select_hw_mode2 - Select the hardware mode (part 2)
203	* @iface: Pointer to interface data.
204	* @status: Status of auto chanel selection.
205	*
206	* Setup the rates and passive scanning based on the configuration.
207	*/
208	static void select_hw_mode2(struct hostapd_iface *iface, int status)
209	{
210	int ret = status;
211	if (ret)
212	goto fail;
213
214	if (iface->current_mode == NULL) {
215	hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
216	HOSTAPD_LEVEL_WARNING,
217	"Hardware does not support configured channel");
218	ret = -1;
219	goto fail;
220	}
221
222	if (hostapd_prepare_rates(iface->bss[0], iface->current_mode)) {
223	wpa_printf(MSG_ERROR, "Failed to prepare rates table.");
224	hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
225	HOSTAPD_LEVEL_WARNING,
226	"Failed to prepare rates table.");
227	ret = -1;
228	goto fail;
229	}
230
231	ret = hostapd_passive_scan(iface->bss[0], 0,
232	iface->conf->passive_scan_mode,
233	iface->conf->passive_scan_interval,
234	iface->conf->passive_scan_listen,
235	NULL, NULL);
236	if (ret) {
237	wpa_printf(MSG_ERROR, "Could not set passive scanning: %s",
238	strerror(ret));
239	ret = 0;
240	}
241
242	fail:
243	select_hw_mode_finalize(iface, ret);
244	}
245
246
247	/**
248	* select_hw_mode2_handler - Calls select_hw_mode2 when auto chan isn't used
249	* @eloop_data: Stores the struct hostapd_iface * for the interface.
250	* @user_ctx: Unused.
251	*/
252	static void select_hw_mode2_handler(void eloop_data, void user_ctx)
253	{
254	struct hostapd_iface *iface = eloop_data;
255
256	select_hw_mode2(iface, 0);
257	}
258
259
260	/**
261	* select_hw_mode1 - Select the hardware mode (part 1)
262	* @iface: Pointer to interface data.
263	* Returns: 0 on success; -1 on failure.
264	*
265	* Setup the hardware mode and channel based on the configuration.
266	* Schedules select_hw_mode2() to be called immediately or after automatic
267	* channel selection takes place.
268	*/
269	static int select_hw_mode1(struct hostapd_iface *iface)
270	{
271	int i, j, ok;
272
273	if (iface->num_hw_features < 1)
274	return -1;
275
276	iface->current_mode = NULL;
277	for (i = 0; i < iface->num_hw_features; i++) {
278	struct hostapd_hw_modes *mode = &iface->hw_features[i];
279	if (mode->mode == (int) iface->conf->hw_mode) {
280	iface->current_mode = mode;
281	break;
282	}
283	}
284
285	if (iface->current_mode == NULL) {
286	wpa_printf(MSG_ERROR, "Hardware does not support configured "
287	"mode");
288	hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
289	HOSTAPD_LEVEL_WARNING,
290	"Hardware does not support configured mode "
291	"(%d)", (int) iface->conf->hw_mode);
292	return -1;
293	}
294
295	ok = 0;
296	for (j = 0; j < iface->current_mode->num_channels; j++) {
297	struct hostapd_channel_data *chan =
298	&iface->current_mode->channels[j];
299	if ((chan->flag & HOSTAPD_CHAN_W_SCAN) &&
300	(chan->chan == iface->conf->channel)) {
301	ok = 1;
302	break;
303	}
304	}
305	if (ok == 0 && iface->conf->channel != 0) {
306	hostapd_logger(iface->bss[0], NULL,
307	HOSTAPD_MODULE_IEEE80211,
308	HOSTAPD_LEVEL_WARNING,
309	"Configured channel (%d) not found from the "
310	"channel list of current mode (%d) %s",
311	iface->conf->channel,
312	iface->current_mode->mode,
313	hostapd_hw_mode_txt(iface->current_mode->mode));
314	iface->current_mode = NULL;
315	}
316
317	/*
318	* Calls select_hw_mode2() via a handler, so that the function is
319	* always executed from eloop.
320	*/
321	eloop_register_timeout(0, 0, select_hw_mode2_handler, iface, NULL);
322	return 0;
323	}
324
325
326	/**
327	* select_hw_mode_start - Handler to start select HW mode
328	* @eloop_data: Stores the struct hostapd_iface * for the interface.
329	* @user_ctx: Unused.
330	*
331	* An eloop handler is used so that all errors can be processed by the
332	* callback without introducing stack recursion.
333	*/
334	static void select_hw_mode_start(void eloop_data, void user_ctx)
335	{
336	struct hostapd_iface iface = (struct hostapd_iface )eloop_data;
337
338	int ret;
339
340	ret = select_hw_mode1(iface);
341	if (ret)
342	select_hw_mode_finalize(iface, ret);
343	}
344
345
346	/**
347	* hostapd_select_hw_mode_start - Start selection of the hardware mode
348	* @iface: Pointer to interface data.
349	* @cb: The function to callback when done.
350	* Returns: 0 if it starts successfully; cb will be called when done.
351	* -1 on failure; cb will not be called.
352	*
353	* Sets up the hardware mode, channel, rates, and passive scanning
354	* based on the configuration.
355	*/
356	int hostapd_select_hw_mode_start(struct hostapd_iface *iface,
357	hostapd_iface_cb cb)
358	{
359	if (iface->hw_mode_sel_cb) {
360	wpa_printf(MSG_DEBUG,
361	"%s: Hardware mode select already in progress.",
362	iface->bss[0]->conf->iface);
363	return -1;
364	}
365
366	iface->hw_mode_sel_cb = cb;
367
368	eloop_register_timeout(0, 0, select_hw_mode_start, iface, NULL);
369
370	return 0;
371	}
372
373
374	/**
375	* hostapd_auto_chan_select_stop - Stops automatic channel selection
376	* @iface: Pointer to interface data.
377	* Returns: 0 if successfully stopped;
378	* -1 on failure (i.e., was not in progress)
379	*/
380	int hostapd_select_hw_mode_stop(struct hostapd_iface *iface)
381	{
382	return select_hw_mode_finalize(iface, -1);
383	}
384
385
386	const char * hostapd_hw_mode_txt(int mode)
387	{
388	switch (mode) {
389	case HOSTAPD_MODE_IEEE80211A:
390	return "IEEE 802.11a";
391	case HOSTAPD_MODE_IEEE80211B:
392	return "IEEE 802.11b";
393	case HOSTAPD_MODE_IEEE80211G:
394	return "IEEE 802.11g";
395	default:
396	return "UNKNOWN";
397	}
398	}
399
400
401	int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
402	{
403	int i;
404
405	if (!hapd->iface->current_mode)
406	return 0;
407
408	for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
409	struct hostapd_channel_data *ch =
410	&hapd->iface->current_mode->channels[i];
411	if (ch->chan == chan)
412	return ch->freq;
413	}
414
415	return 0;
416	}
417
418
419	int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
420	{
421	int i;
422
423	if (!hapd->iface->current_mode)
424	return 0;
425
426	for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
427	struct hostapd_channel_data *ch =
428	&hapd->iface->current_mode->channels[i];
429	if (ch->freq == freq)
430	return ch->chan;
431	}
432
433	return 0;
434	}