[thirdparty/hostap.git] / src / ap / hw_features.c

/*
 * hostapd / Hardware feature query and different modes
 * Copyright 2002-2003, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright (c) 2008-2009, Jouni Malinen <j@w1.fi>
 *
 * 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 "utils/includes.h"

#include "utils/common.h"
#include "utils/eloop.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "hostapd.h"
#include "ap_config.h"
#include "driver_i.h"
#include "hw_features.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++) {
			/*
			 * Disable all channels that are marked not to allow
			 * IBSS operation or active scanning. In addition,
			 * disable all channels that require radar detection,
			 * since that (in addition to full DFS) is not yet
			 * supported.
			 */
			if (feature->channels[j].flag &
			    (HOSTAPD_CHAN_NO_IBSS |
			     HOSTAPD_CHAN_PASSIVE_SCAN |
			     HOSTAPD_CHAN_RADAR))
				feature->channels[j].flag |=
					HOSTAPD_CHAN_DISABLED;
			if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
				continue;
			wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
				   "chan=%d freq=%d MHz max_tx_power=%d dBm",
				   feature->mode,
				   feature->channels[j].chan,
				   feature->channels[j].freq,
				   feature->channels[j].max_tx_power);
		}
	}

	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_zalloc(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]))
			continue;

		rate = &hapd->iface->current_rates[hapd->iface->num_rates];
		rate->rate = mode->rates[i];
		if (hostapd_rate_found(basic_rates, rate->rate)) {
			rate->flags |= HOSTAPD_RATE_BASIC;
			num_basic_rates++;
		}
		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;
}


#ifdef CONFIG_IEEE80211N
static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
{
	int sec_chan, ok, j, first;
	int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
			  184, 192 };
	size_t k;

	if (!iface->conf->secondary_channel)
		return 1; /* HT40 not used */

	sec_chan = iface->conf->channel + iface->conf->secondary_channel * 4;
	wpa_printf(MSG_DEBUG, "HT40: control channel: %d  "
		   "secondary channel: %d",
		   iface->conf->channel, sec_chan);

	/* Verify that HT40 secondary channel is an allowed 20 MHz
	 * channel */
	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_DISABLED) &&
		    chan->chan == sec_chan) {
			ok = 1;
			break;
		}
	}
	if (!ok) {
		wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed",
			   sec_chan);
		return 0;
	}

	/*
	 * Verify that HT40 primary,secondary channel pair is allowed per
	 * IEEE 802.11n Annex J. This is only needed for 5 GHz band since
	 * 2.4 GHz rules allow all cases where the secondary channel fits into
	 * the list of allowed channels (already checked above).
	 */
	if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
		return 1;

	if (iface->conf->secondary_channel > 0)
		first = iface->conf->channel;
	else
		first = sec_chan;

	ok = 0;
	for (k = 0; k < sizeof(allowed) / sizeof(allowed[0]); k++) {
		if (first == allowed[k]) {
			ok = 1;
			break;
		}
	}
	if (!ok) {
		wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed",
			   iface->conf->channel,
			   iface->conf->secondary_channel);
		return 0;
	}

	return 1;
}


static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
{
	if (iface->conf->secondary_channel > 0) {
		iface->conf->channel += 4;
		iface->conf->secondary_channel = -1;
	} else {
		iface->conf->channel -= 4;
		iface->conf->secondary_channel = 1;
	}
}


static void ieee80211n_get_pri_sec_chan(struct wpa_scan_res *bss,
					int *pri_chan, int *sec_chan)
{
	struct ieee80211_ht_operation *oper;
	struct ieee802_11_elems elems;

	*pri_chan = *sec_chan = 0;

	ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
	if (elems.ht_operation &&
	    elems.ht_operation_len >= sizeof(*oper)) {
		oper = (struct ieee80211_ht_operation *) elems.ht_operation;
		*pri_chan = oper->control_chan;
		if (oper->ht_param & HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH) {
			if (oper->ht_param &
			    HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
				*sec_chan = *pri_chan + 4;
			else if (oper->ht_param &
				 HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
				*sec_chan = *pri_chan - 4;
		}
	}
}


static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
				     struct wpa_scan_results *scan_res)
{
	int pri_chan, sec_chan, pri_freq, sec_freq, pri_bss, sec_bss;
	int bss_pri_chan, bss_sec_chan;
	size_t i;
	int match;

	pri_chan = iface->conf->channel;
	sec_chan = iface->conf->secondary_channel * 4;
	pri_freq = hostapd_hw_get_freq(iface->bss[0], pri_chan);
	if (iface->conf->secondary_channel > 0)
		sec_freq = pri_freq + 20;
	else
		sec_freq = pri_freq - 20;

	/*
	 * Switch PRI/SEC channels if Beacons were detected on selected SEC
	 * channel, but not on selected PRI channel.
	 */
	pri_bss = sec_bss = 0;
	for (i = 0; i < scan_res->num; i++) {
		struct wpa_scan_res *bss = scan_res->res[i];
		if (bss->freq == pri_freq)
			pri_bss++;
		else if (bss->freq == sec_freq)
			sec_bss++;
	}
	if (sec_bss && !pri_bss) {
		wpa_printf(MSG_INFO, "Switch own primary and secondary "
			   "channel to get secondary channel with no Beacons "
			   "from other BSSes");
		ieee80211n_switch_pri_sec(iface);
	}

	/*
	 * Match PRI/SEC channel with any existing HT40 BSS on the same
	 * channels that we are about to use (if already mixed order in
	 * existing BSSes, use own preference).
	 */
	match = 0;
	for (i = 0; i < scan_res->num; i++) {
		struct wpa_scan_res *bss = scan_res->res[i];
		ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
		if (pri_chan == bss_pri_chan &&
		    sec_chan == bss_sec_chan) {
			match = 1;
			break;
		}
	}
	if (!match) {
		for (i = 0; i < scan_res->num; i++) {
			struct wpa_scan_res *bss = scan_res->res[i];
			ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan,
						    &bss_sec_chan);
			if (pri_chan == bss_sec_chan &&
			    sec_chan == bss_pri_chan) {
				wpa_printf(MSG_INFO, "Switch own primary and "
					   "secondary channel due to BSS "
					   "overlap with " MACSTR,
					   MAC2STR(bss->bssid));
				ieee80211n_switch_pri_sec(iface);
				break;
			}
		}
	}

	return 1;
}


static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
				      struct wpa_scan_results *scan_res)
{
	int pri_freq, sec_freq;
	int affected_start, affected_end;
	size_t i;

	pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
	if (iface->conf->secondary_channel > 0)
		sec_freq = pri_freq + 20;
	else
		sec_freq = pri_freq - 20;
	affected_start = (pri_freq + sec_freq) / 2 - 25;
	affected_end = (pri_freq + sec_freq) / 2 + 25;
	wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
		   affected_start, affected_end);
	for (i = 0; i < scan_res->num; i++) {
		struct wpa_scan_res *bss = scan_res->res[i];
		int pri = bss->freq;
		int sec = pri;
		int sec_chan, pri_chan;

		ieee80211n_get_pri_sec_chan(bss, &pri_chan, &sec_chan);

		if (sec_chan) {
			if (sec_chan < pri_chan)
				sec = pri - 20;
			else
				sec = pri + 20;
		}

		if ((pri < affected_start || pri > affected_end) &&
		    (sec < affected_start || sec > affected_end))
			continue; /* not within affected channel range */

		wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
			   " freq=%d pri=%d sec=%d",
			   MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);

		if (sec_chan) {
			if (pri_freq != pri || sec_freq != sec) {
				wpa_printf(MSG_DEBUG, "40 MHz pri/sec "
					   "mismatch with BSS " MACSTR
					   " <%d,%d> (chan=%d%c) vs. <%d,%d>",
					   MAC2STR(bss->bssid),
					   pri, sec, pri_chan,
					   sec > pri ? '+' : '-',
					   pri_freq, sec_freq);
				return 0;
			}
		}

		/* TODO: 40 MHz intolerant */
	}

	return 1;
}


static void ieee80211n_check_scan(struct hostapd_iface *iface)
{
	struct wpa_scan_results *scan_res;
	int oper40;

	/* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
	 * allowed per IEEE 802.11n/D7.0, 11.14.3.2 */

	iface->scan_cb = NULL;

	scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
	if (scan_res == NULL) {
		hostapd_setup_interface_complete(iface, 1);
		return;
	}

	if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
		oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
	else
		oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
	wpa_scan_results_free(scan_res);

	if (!oper40) {
		wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
			   "channel pri=%d sec=%d based on overlapping BSSes",
			   iface->conf->channel,
			   iface->conf->channel +
			   iface->conf->secondary_channel * 4);
		iface->conf->secondary_channel = 0;
		iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
	}

	hostapd_setup_interface_complete(iface, 0);
}


static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
{
	struct wpa_driver_scan_params params;

	if (!iface->conf->secondary_channel)
		return 0; /* HT40 not used */

	wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
		   "40 MHz channel");
	os_memset(&params, 0, sizeof(params));
	/* TODO: scan only the needed frequency */
	if (hostapd_driver_scan(iface->bss[0], &params) < 0) {
		wpa_printf(MSG_ERROR, "Failed to request a scan of "
			   "neighboring BSSes");
		return -1;
	}

	iface->scan_cb = ieee80211n_check_scan;
	return 1;
}


static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
{
	u16 hw = iface->current_mode->ht_capab;
	u16 conf = iface->conf->ht_capab;

	if (!iface->conf->ieee80211n)
		return 1;

	if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) &&
	    !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [LDPC]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
	    !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [HT40*]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_SMPS_MASK) != (hw & HT_CAP_INFO_SMPS_MASK) &&
	    (conf & HT_CAP_INFO_SMPS_MASK) != HT_CAP_INFO_SMPS_DISABLED) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [SMPS-*]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_GREEN_FIELD) &&
	    !(hw & HT_CAP_INFO_GREEN_FIELD)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [GF]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) &&
	    !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [SHORT-GI-20]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) &&
	    !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [SHORT-GI-40]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [TX-STBC]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_RX_STBC_MASK) >
	    (hw & HT_CAP_INFO_RX_STBC_MASK)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [RX-STBC*]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_DELAYED_BA) &&
	    !(hw & HT_CAP_INFO_DELAYED_BA)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [DELAYED-BA]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) &&
	    !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [MAX-AMSDU-7935]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) &&
	    !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [DSSS_CCK-40]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_PSMP_SUPP) && !(hw & HT_CAP_INFO_PSMP_SUPP)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [PSMP]");
		return 0;
	}

	if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) &&
	    !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) {
		wpa_printf(MSG_ERROR, "Driver does not support configured "
			   "HT capability [LSIG-TXOP-PROT]");
		return 0;
	}

	return 1;
}

#endif /* CONFIG_IEEE80211N */


int hostapd_check_ht_capab(struct hostapd_iface *iface)
{
#ifdef CONFIG_IEEE80211N
	int ret;
	ret = ieee80211n_check_40mhz(iface);
	if (ret)
		return ret;
	if (!ieee80211n_allowed_ht40_channel_pair(iface))
		return -1;
	if (!ieee80211n_supported_ht_capab(iface))
		return -1;
#endif /* CONFIG_IEEE80211N */

	return 0;
}


/**
 * hostapd_select_hw_mode - Select the hardware mode
 * @iface: Pointer to interface data.
 * Returns: 0 on success, -1 on failure
 *
 * Sets up the hardware mode, channel, rates, and passive scanning
 * based on the configuration.
 */
int hostapd_select_hw_mode(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 == 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_DISABLED) &&
		    (chan->chan == iface->conf->channel)) {
			ok = 1;
			break;
		}
	}
	if (iface->conf->channel == 0) {
		/* TODO: could request a scan of neighboring BSSes and select
		 * the channel automatically */
		wpa_printf(MSG_ERROR, "Channel not configured "
			   "(hw_mode/channel in hostapd.conf)");
		return -1;
	}
	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;
	}

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

	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.");
		return -1;
	}

	return 0;
}


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.
1057d78e	5	* Copyright (c) 2008-2009, Jouni Malinen <j@w1.fi>
6fc6879b JM	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* Alternatively, this software may be distributed under the terms of BSD
	12	* license.
	13	*
	14	* See README and COPYING for more details.
	15	*/
	16
1057d78e	17	#include "utils/includes.h"
6fc6879b	18
1057d78e JM	19	#include "utils/common.h"
1057d78e JM	20	#include "utils/eloop.h"
90973fb2 JM	21	#include "common/ieee802_11_defs.h"
90973fb2 JM	22	#include "common/ieee802_11_common.h"
6226e38d JM	23	#include "hostapd.h"
6226e38d JM	24	#include "ap_config.h"
bfddd95c	25	#include "driver_i.h"
6226e38d	26	#include "hw_features.h"
6fc6879b JM	27
	28
	29	void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
	30	size_t num_hw_features)
	31	{
	32	size_t i;
	33
	34	if (hw_features == NULL)
	35	return;
	36
	37	for (i = 0; i < num_hw_features; i++) {
	38	os_free(hw_features[i].channels);
	39	os_free(hw_features[i].rates);
	40	}
	41
	42	os_free(hw_features);
	43	}
	44
	45
	46	int hostapd_get_hw_features(struct hostapd_iface *iface)
	47	{
	48	struct hostapd_data *hapd = iface->bss[0];
	49	int ret = 0, i, j;
	50	u16 num_modes, flags;
	51	struct hostapd_hw_modes *modes;
	52
85141289 JM	53	if (hostapd_drv_none(hapd))
85141289 JM	54	return -1;
6fc6879b JM	55	modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags);
	56	if (modes == NULL) {
	57	hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
	58	HOSTAPD_LEVEL_DEBUG,
	59	"Fetching hardware channel/rate support not "
	60	"supported.");
	61	return -1;
	62	}
	63
	64	iface->hw_flags = flags;
	65
	66	hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
	67	iface->hw_features = modes;
	68	iface->num_hw_features = num_modes;
	69
	70	for (i = 0; i < num_modes; i++) {
	71	struct hostapd_hw_modes *feature = &modes[i];
	72	/* set flag for channels we can use in current regulatory
	73	* domain */
	74	for (j = 0; j < feature->num_channels; j++) {
10b83bd7 JM	75	/*
	76	* Disable all channels that are marked not to allow
	77	* IBSS operation or active scanning. In addition,
	78	* disable all channels that require radar detection,
	79	* since that (in addition to full DFS) is not yet
	80	* supported.
	81	*/
	82	if (feature->channels[j].flag &
	83	(HOSTAPD_CHAN_NO_IBSS \|
	84	HOSTAPD_CHAN_PASSIVE_SCAN \|
	85	HOSTAPD_CHAN_RADAR))
6fc6879b	86	feature->channels[j].flag \|=
10b83bd7 JM	87	HOSTAPD_CHAN_DISABLED;
	88	if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
	89	continue;
	90	wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
bf01d8bc	91	"chan=%d freq=%d MHz max_tx_power=%d dBm",
10b83bd7 JM	92	feature->mode,
10b83bd7 JM	93	feature->channels[j].chan,
bf01d8bc JM	94	feature->channels[j].freq,
bf01d8bc JM	95	feature->channels[j].max_tx_power);
6fc6879b JM	96	}
	97	}
	98
	99	return ret;
	100	}
	101
	102
	103	static int hostapd_prepare_rates(struct hostapd_data *hapd,
	104	struct hostapd_hw_modes *mode)
	105	{
	106	int i, num_basic_rates = 0;
	107	int basic_rates_a[] = { 60, 120, 240, -1 };
	108	int basic_rates_b[] = { 10, 20, -1 };
	109	int basic_rates_g[] = { 10, 20, 55, 110, -1 };
	110	int *basic_rates;
	111
	112	if (hapd->iconf->basic_rates)
	113	basic_rates = hapd->iconf->basic_rates;
	114	else switch (mode->mode) {
	115	case HOSTAPD_MODE_IEEE80211A:
	116	basic_rates = basic_rates_a;
	117	break;
	118	case HOSTAPD_MODE_IEEE80211B:
	119	basic_rates = basic_rates_b;
	120	break;
	121	case HOSTAPD_MODE_IEEE80211G:
	122	basic_rates = basic_rates_g;
	123	break;
	124	default:
	125	return -1;
	126	}
	127
	128	if (hostapd_set_rate_sets(hapd, hapd->iconf->supported_rates,
	129	basic_rates, mode->mode)) {
	130	wpa_printf(MSG_ERROR, "Failed to update rate sets in kernel "
	131	"module");
	132	}
	133
	134	os_free(hapd->iface->current_rates);
	135	hapd->iface->num_rates = 0;
	136
	137	hapd->iface->current_rates =
fb7842aa	138	os_zalloc(mode->num_rates * sizeof(struct hostapd_rate_data));
6fc6879b JM	139	if (!hapd->iface->current_rates) {
	140	wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
	141	"table.");
	142	return -1;
	143	}
	144
	145	for (i = 0; i < mode->num_rates; i++) {
	146	struct hostapd_rate_data *rate;
	147
	148	if (hapd->iconf->supported_rates &&
	149	!hostapd_rate_found(hapd->iconf->supported_rates,
fb7842aa	150	mode->rates[i]))
6fc6879b JM	151	continue;
	152
	153	rate = &hapd->iface->current_rates[hapd->iface->num_rates];
fb7842aa	154	rate->rate = mode->rates[i];
6fc6879b JM	155	if (hostapd_rate_found(basic_rates, rate->rate)) {
	156	rate->flags \|= HOSTAPD_RATE_BASIC;
	157	num_basic_rates++;
fb7842aa	158	}
6fc6879b JM	159	wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
	160	hapd->iface->num_rates, rate->rate, rate->flags);
	161	hapd->iface->num_rates++;
	162	}
	163
	164	if (hapd->iface->num_rates == 0 \|\| num_basic_rates == 0) {
	165	wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
	166	"rate sets (%d,%d).",
	167	hapd->iface->num_rates, num_basic_rates);
	168	return -1;
	169	}
	170
	171	return 0;
	172	}
	173
	174
3e0cb2c5 JM	175	#ifdef CONFIG_IEEE80211N
	176	static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
	177	{
	178	int sec_chan, ok, j, first;
	179	int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
	180	184, 192 };
	181	size_t k;
	182
	183	if (!iface->conf->secondary_channel)
	184	return 1; /* HT40 not used */
	185
	186	sec_chan = iface->conf->channel + iface->conf->secondary_channel * 4;
	187	wpa_printf(MSG_DEBUG, "HT40: control channel: %d "
	188	"secondary channel: %d",
	189	iface->conf->channel, sec_chan);
	190
	191	/* Verify that HT40 secondary channel is an allowed 20 MHz
	192	* channel */
	193	ok = 0;
	194	for (j = 0; j < iface->current_mode->num_channels; j++) {
	195	struct hostapd_channel_data *chan =
	196	&iface->current_mode->channels[j];
	197	if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
	198	chan->chan == sec_chan) {
	199	ok = 1;
	200	break;
	201	}
	202	}
	203	if (!ok) {
	204	wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed",
	205	sec_chan);
	206	return 0;
	207	}
	208
	209	/*
	210	* Verify that HT40 primary,secondary channel pair is allowed per
	211	* IEEE 802.11n Annex J. This is only needed for 5 GHz band since
	212	* 2.4 GHz rules allow all cases where the secondary channel fits into
	213	* the list of allowed channels (already checked above).
	214	*/
	215	if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
	216	return 1;
	217
	218	if (iface->conf->secondary_channel > 0)
	219	first = iface->conf->channel;
	220	else
	221	first = sec_chan;
	222
	223	ok = 0;
	224	for (k = 0; k < sizeof(allowed) / sizeof(allowed[0]); k++) {
	225	if (first == allowed[k]) {
	226	ok = 1;
	227	break;
	228	}
	229	}
	230	if (!ok) {
	231	wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed",
	232	iface->conf->channel,
	233	iface->conf->secondary_channel);
	234	return 0;
	235	}
	236
	237	return 1;
	238	}
30fd5f14 JM	239
30fd5f14 JM	240
5eb4e3d0 JM	241	static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
	242	{
	243	if (iface->conf->secondary_channel > 0) {
	244	iface->conf->channel += 4;
	245	iface->conf->secondary_channel = -1;
	246	} else {
	247	iface->conf->channel -= 4;
	248	iface->conf->secondary_channel = 1;
	249	}
	250	}
	251
	252
ad1e68e6 JM	253	static void ieee80211n_get_pri_sec_chan(struct wpa_scan_res *bss,
	254	int pri_chan, int sec_chan)
	255	{
	256	struct ieee80211_ht_operation *oper;
	257	struct ieee802_11_elems elems;
	258
	259	pri_chan = sec_chan = 0;
	260
	261	ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
	262	if (elems.ht_operation &&
	263	elems.ht_operation_len >= sizeof(*oper)) {
	264	oper = (struct ieee80211_ht_operation *) elems.ht_operation;
	265	*pri_chan = oper->control_chan;
	266	if (oper->ht_param & HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH) {
	267	if (oper->ht_param &
	268	HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
	269	sec_chan = pri_chan + 4;
	270	else if (oper->ht_param &
	271	HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
	272	sec_chan = pri_chan - 4;
	273	}
	274	}
	275	}
	276
	277
	278	static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
	279	struct wpa_scan_results *scan_res)
5eb4e3d0 JM	280	{
5eb4e3d0 JM	281	int pri_chan, sec_chan, pri_freq, sec_freq, pri_bss, sec_bss;
ad1e68e6 JM	282	int bss_pri_chan, bss_sec_chan;
ad1e68e6 JM	283	size_t i;
5eb4e3d0 JM	284	int match;
	285
	286	pri_chan = iface->conf->channel;
	287	sec_chan = iface->conf->secondary_channel * 4;
	288	pri_freq = hostapd_hw_get_freq(iface->bss[0], pri_chan);
	289	if (iface->conf->secondary_channel > 0)
	290	sec_freq = pri_freq + 20;
	291	else
	292	sec_freq = pri_freq - 20;
	293
5eb4e3d0 JM	294	/*
	295	* Switch PRI/SEC channels if Beacons were detected on selected SEC
	296	* channel, but not on selected PRI channel.
	297	*/
	298	pri_bss = sec_bss = 0;
ad1e68e6 JM	299	for (i = 0; i < scan_res->num; i++) {
	300	struct wpa_scan_res *bss = scan_res->res[i];
	301	if (bss->freq == pri_freq)
5eb4e3d0	302	pri_bss++;
ad1e68e6	303	else if (bss->freq == sec_freq)
5eb4e3d0 JM	304	sec_bss++;
	305	}
	306	if (sec_bss && !pri_bss) {
	307	wpa_printf(MSG_INFO, "Switch own primary and secondary "
	308	"channel to get secondary channel with no Beacons "
	309	"from other BSSes");
	310	ieee80211n_switch_pri_sec(iface);
	311	}
	312
	313	/*
	314	* Match PRI/SEC channel with any existing HT40 BSS on the same
	315	* channels that we are about to use (if already mixed order in
	316	* existing BSSes, use own preference).
	317	*/
	318	match = 0;
ad1e68e6 JM	319	for (i = 0; i < scan_res->num; i++) {
	320	struct wpa_scan_res *bss = scan_res->res[i];
	321	ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
	322	if (pri_chan == bss_pri_chan &&
	323	sec_chan == bss_sec_chan) {
5eb4e3d0 JM	324	match = 1;
	325	break;
	326	}
	327	}
	328	if (!match) {
ad1e68e6 JM	329	for (i = 0; i < scan_res->num; i++) {
ad1e68e6 JM	330	struct wpa_scan_res *bss = scan_res->res[i];
c6313c75 FF	331	ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan,
c6313c75 FF	332	&bss_sec_chan);
ad1e68e6 JM	333	if (pri_chan == bss_sec_chan &&
ad1e68e6 JM	334	sec_chan == bss_pri_chan) {
5eb4e3d0 JM	335	wpa_printf(MSG_INFO, "Switch own primary and "
	336	"secondary channel due to BSS "
	337	"overlap with " MACSTR,
ad1e68e6	338	MAC2STR(bss->bssid));
5eb4e3d0 JM	339	ieee80211n_switch_pri_sec(iface);
	340	break;
	341	}
	342	}
	343	}
	344
	345	return 1;
	346	}
	347
	348
ad1e68e6 JM	349	static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
ad1e68e6 JM	350	struct wpa_scan_results *scan_res)
5eb4e3d0 JM	351	{
	352	int pri_freq, sec_freq;
	353	int affected_start, affected_end;
ad1e68e6	354	size_t i;
5eb4e3d0 JM	355
	356	pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
	357	if (iface->conf->secondary_channel > 0)
	358	sec_freq = pri_freq + 20;
	359	else
	360	sec_freq = pri_freq - 20;
	361	affected_start = (pri_freq + sec_freq) / 2 - 25;
	362	affected_end = (pri_freq + sec_freq) / 2 + 25;
	363	wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
	364	affected_start, affected_end);
ad1e68e6 JM	365	for (i = 0; i < scan_res->num; i++) {
	366	struct wpa_scan_res *bss = scan_res->res[i];
	367	int pri = bss->freq;
5eb4e3d0	368	int sec = pri;
ad1e68e6 JM	369	int sec_chan, pri_chan;
	370
	371	ieee80211n_get_pri_sec_chan(bss, &pri_chan, &sec_chan);
	372
	373	if (sec_chan) {
	374	if (sec_chan < pri_chan)
5eb4e3d0 JM	375	sec = pri - 20;
	376	else
	377	sec = pri + 20;
	378	}
	379
	380	if ((pri < affected_start \|\| pri > affected_end) &&
	381	(sec < affected_start \|\| sec > affected_end))
	382	continue; /* not within affected channel range */
	383
ad1e68e6 JM	384	wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
	385	" freq=%d pri=%d sec=%d",
	386	MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);
	387
	388	if (sec_chan) {
5eb4e3d0 JM	389	if (pri_freq != pri \|\| sec_freq != sec) {
	390	wpa_printf(MSG_DEBUG, "40 MHz pri/sec "
	391	"mismatch with BSS " MACSTR
	392	" <%d,%d> (chan=%d%c) vs. <%d,%d>",
ad1e68e6 JM	393	MAC2STR(bss->bssid),
ad1e68e6 JM	394	pri, sec, pri_chan,
5eb4e3d0 JM	395	sec > pri ? '+' : '-',
	396	pri_freq, sec_freq);
	397	return 0;
	398	}
	399	}
	400
	401	/* TODO: 40 MHz intolerant */
	402	}
	403
	404	return 1;
	405	}
	406
	407
ad1e68e6	408	static void ieee80211n_check_scan(struct hostapd_iface *iface)
5eb4e3d0	409	{
ad1e68e6	410	struct wpa_scan_results *scan_res;
5eb4e3d0 JM	411	int oper40;
5eb4e3d0 JM	412
5eb4e3d0 JM	413	/* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
	414	* allowed per IEEE 802.11n/D7.0, 11.14.3.2 */
	415
ad1e68e6 JM	416	iface->scan_cb = NULL;
	417
	418	scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
	419	if (scan_res == NULL) {
	420	hostapd_setup_interface_complete(iface, 1);
	421	return;
	422	}
	423
5eb4e3d0	424	if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
ad1e68e6	425	oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
5eb4e3d0	426	else
ad1e68e6 JM	427	oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
ad1e68e6 JM	428	wpa_scan_results_free(scan_res);
5eb4e3d0 JM	429
	430	if (!oper40) {
	431	wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
	432	"channel pri=%d sec=%d based on overlapping BSSes",
	433	iface->conf->channel,
	434	iface->conf->channel +
	435	iface->conf->secondary_channel * 4);
	436	iface->conf->secondary_channel = 0;
	437	iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
	438	}
ad1e68e6 JM	439
	440	hostapd_setup_interface_complete(iface, 0);
	441	}
	442
	443
	444	static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
	445	{
	446	struct wpa_driver_scan_params params;
	447
	448	if (!iface->conf->secondary_channel)
	449	return 0; /* HT40 not used */
	450
	451	wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
	452	"40 MHz channel");
	453	os_memset(&params, 0, sizeof(params));
	454	/* TODO: scan only the needed frequency */
	455	if (hostapd_driver_scan(iface->bss[0], &params) < 0) {
	456	wpa_printf(MSG_ERROR, "Failed to request a scan of "
	457	"neighboring BSSes");
	458	return -1;
	459	}
	460
	461	iface->scan_cb = ieee80211n_check_scan;
	462	return 1;
5eb4e3d0 JM	463	}
	464
	465
30fd5f14 JM	466	static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
	467	{
	468	u16 hw = iface->current_mode->ht_capab;
	469	u16 conf = iface->conf->ht_capab;
	470
	471	if (!iface->conf->ieee80211n)
	472	return 1;
	473
	474	if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) &&
	475	!(hw & HT_CAP_INFO_LDPC_CODING_CAP)) {
	476	wpa_printf(MSG_ERROR, "Driver does not support configured "
	477	"HT capability [LDPC]");
	478	return 0;
	479	}
	480
	481	if ((conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
	482	!(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
	483	wpa_printf(MSG_ERROR, "Driver does not support configured "
	484	"HT capability [HT40*]");
	485	return 0;
	486	}
	487
	488	if ((conf & HT_CAP_INFO_SMPS_MASK) != (hw & HT_CAP_INFO_SMPS_MASK) &&
	489	(conf & HT_CAP_INFO_SMPS_MASK) != HT_CAP_INFO_SMPS_DISABLED) {
	490	wpa_printf(MSG_ERROR, "Driver does not support configured "
	491	"HT capability [SMPS-*]");
	492	return 0;
	493	}
	494
	495	if ((conf & HT_CAP_INFO_GREEN_FIELD) &&
	496	!(hw & HT_CAP_INFO_GREEN_FIELD)) {
	497	wpa_printf(MSG_ERROR, "Driver does not support configured "
	498	"HT capability [GF]");
	499	return 0;
	500	}
	501
	502	if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) &&
	503	!(hw & HT_CAP_INFO_SHORT_GI20MHZ)) {
	504	wpa_printf(MSG_ERROR, "Driver does not support configured "
	505	"HT capability [SHORT-GI-20]");
	506	return 0;
	507	}
	508
	509	if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) &&
	510	!(hw & HT_CAP_INFO_SHORT_GI40MHZ)) {
	511	wpa_printf(MSG_ERROR, "Driver does not support configured "
	512	"HT capability [SHORT-GI-40]");
	513	return 0;
	514	}
	515
	516	if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) {
	517	wpa_printf(MSG_ERROR, "Driver does not support configured "
	518	"HT capability [TX-STBC]");
	519	return 0;
	520	}
	521
	522	if ((conf & HT_CAP_INFO_RX_STBC_MASK) >
	523	(hw & HT_CAP_INFO_RX_STBC_MASK)) {
	524	wpa_printf(MSG_ERROR, "Driver does not support configured "
	525	"HT capability [RX-STBC*]");
	526	return 0;
	527	}
	528
	529	if ((conf & HT_CAP_INFO_DELAYED_BA) &&
530	!(hw & HT_CAP_INFO_DELAYED_BA)) {
531	wpa_printf(MSG_ERROR, "Driver does not support configured "
532	"HT capability [DELAYED-BA]");
533	return 0;
534	}
535
536	if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) &&
537	!(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) {
538	wpa_printf(MSG_ERROR, "Driver does not support configured "
539	"HT capability [MAX-AMSDU-7935]");
540	return 0;
541	}
542
543	if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) &&
544	!(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) {
545	wpa_printf(MSG_ERROR, "Driver does not support configured "
546	"HT capability [DSSS_CCK-40]");
547	return 0;
548	}
549
550	if ((conf & HT_CAP_INFO_PSMP_SUPP) && !(hw & HT_CAP_INFO_PSMP_SUPP)) {
551	wpa_printf(MSG_ERROR, "Driver does not support configured "
552	"HT capability [PSMP]");
553	return 0;
554	}
555
556	if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) &&
557	!(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) {
558	wpa_printf(MSG_ERROR, "Driver does not support configured "
559	"HT capability [LSIG-TXOP-PROT]");
560	return 0;
561	}
562
563	return 1;
564	}
ad1e68e6 JM	565
	566	#endif /* CONFIG_IEEE80211N */
	567
	568
	569	int hostapd_check_ht_capab(struct hostapd_iface *iface)
	570	{
	571	#ifdef CONFIG_IEEE80211N
	572	int ret;
	573	ret = ieee80211n_check_40mhz(iface);
	574	if (ret)
	575	return ret;
	576	if (!ieee80211n_allowed_ht40_channel_pair(iface))
	577	return -1;
	578	if (!ieee80211n_supported_ht_capab(iface))
	579	return -1;
3e0cb2c5 JM	580	#endif /* CONFIG_IEEE80211N */
3e0cb2c5 JM	581
ad1e68e6 JM	582	return 0;
	583	}
	584
3e0cb2c5	585
6fc6879b	586	/**
ddaa83eb	587	* hostapd_select_hw_mode - Select the hardware mode
6fc6879b	588	* @iface: Pointer to interface data.
ddaa83eb	589	* Returns: 0 on success, -1 on failure
6fc6879b	590	*
ddaa83eb JM	591	* Sets up the hardware mode, channel, rates, and passive scanning
ddaa83eb JM	592	* based on the configuration.
6fc6879b	593	*/
ddaa83eb	594	int hostapd_select_hw_mode(struct hostapd_iface *iface)
6fc6879b	595	{
61693eaa	596	int i, j, ok;
6fc6879b JM	597
	598	if (iface->num_hw_features < 1)
	599	return -1;
	600
	601	iface->current_mode = NULL;
	602	for (i = 0; i < iface->num_hw_features; i++) {
	603	struct hostapd_hw_modes *mode = &iface->hw_features[i];
6caf9ca6	604	if (mode->mode == iface->conf->hw_mode) {
6fc6879b JM	605	iface->current_mode = mode;
	606	break;
	607	}
	608	}
	609
	610	if (iface->current_mode == NULL) {
	611	wpa_printf(MSG_ERROR, "Hardware does not support configured "
	612	"mode");
	613	hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
	614	HOSTAPD_LEVEL_WARNING,
	615	"Hardware does not support configured mode "
	616	"(%d)", (int) iface->conf->hw_mode);
	617	return -1;
	618	}
	619
	620	ok = 0;
	621	for (j = 0; j < iface->current_mode->num_channels; j++) {
	622	struct hostapd_channel_data *chan =
	623	&iface->current_mode->channels[j];
10b83bd7	624	if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
6fc6879b JM	625	(chan->chan == iface->conf->channel)) {
	626	ok = 1;
	627	break;
	628	}
	629	}
24c9fceb JM	630	if (iface->conf->channel == 0) {
	631	/* TODO: could request a scan of neighboring BSSes and select
	632	* the channel automatically */
	633	wpa_printf(MSG_ERROR, "Channel not configured "
	634	"(hw_mode/channel in hostapd.conf)");
	635	return -1;
	636	}
6fc6879b JM	637	if (ok == 0 && iface->conf->channel != 0) {
	638	hostapd_logger(iface->bss[0], NULL,
	639	HOSTAPD_MODULE_IEEE80211,
	640	HOSTAPD_LEVEL_WARNING,
	641	"Configured channel (%d) not found from the "
	642	"channel list of current mode (%d) %s",
	643	iface->conf->channel,
	644	iface->current_mode->mode,
	645	hostapd_hw_mode_txt(iface->current_mode->mode));
	646	iface->current_mode = NULL;
	647	}
	648
ddaa83eb JM	649	if (iface->current_mode == NULL) {
	650	hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
	651	HOSTAPD_LEVEL_WARNING,
	652	"Hardware does not support configured channel");
6fc6879b JM	653	return -1;
	654	}
	655
ddaa83eb JM	656	if (hostapd_prepare_rates(iface->bss[0], iface->current_mode)) {
	657	wpa_printf(MSG_ERROR, "Failed to prepare rates table.");
	658	hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
	659	HOSTAPD_LEVEL_WARNING,
	660	"Failed to prepare rates table.");
	661	return -1;
	662	}
6fc6879b	663
61693eaa	664	return 0;
6fc6879b JM	665	}
	666
	667
	668	const char * hostapd_hw_mode_txt(int mode)
	669	{
	670	switch (mode) {
	671	case HOSTAPD_MODE_IEEE80211A:
	672	return "IEEE 802.11a";
	673	case HOSTAPD_MODE_IEEE80211B:
	674	return "IEEE 802.11b";
	675	case HOSTAPD_MODE_IEEE80211G:
	676	return "IEEE 802.11g";
	677	default:
	678	return "UNKNOWN";
	679	}
	680	}
	681
	682
	683	int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
	684	{
	685	int i;
	686
	687	if (!hapd->iface->current_mode)
	688	return 0;
	689
	690	for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
	691	struct hostapd_channel_data *ch =
	692	&hapd->iface->current_mode->channels[i];
	693	if (ch->chan == chan)
	694	return ch->freq;
	695	}
	696
	697	return 0;
	698	}
	699
	700
	701	int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
	702	{
	703	int i;
	704
	705	if (!hapd->iface->current_mode)
	706	return 0;
	707
	708	for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
	709	struct hostapd_channel_data *ch =
	710	&hapd->iface->current_mode->channels[i];
	711	if (ch->freq == freq)
	712	return ch->chan;
	713	}
	714
	715	return 0;
	716	}