scan.c 60.3 KB
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/*
 * Marvell Wireless LAN device driver: scan ioctl and command handling
 *
 * Copyright (C) 2011, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "11n.h"
#include "cfg80211.h"

/* The maximum number of channels the firmware can scan per command */
#define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN   14

#define MWIFIEX_CHANNELS_PER_SCAN_CMD            4

/* Memory needed to store a max sized Channel List TLV for a firmware scan */
#define CHAN_TLV_MAX_SIZE  (sizeof(struct mwifiex_ie_types_header)         \
				+ (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN     \
				*sizeof(struct mwifiex_chan_scan_param_set)))

/* Memory needed to store supported rate */
#define RATE_TLV_MAX_SIZE   (sizeof(struct mwifiex_ie_types_rates_param_set) \
				+ HOSTCMD_SUPPORTED_RATES)

/* Memory needed to store a max number/size WildCard SSID TLV for a firmware
	scan */
#define WILDCARD_SSID_TLV_MAX_SIZE  \
	(MWIFIEX_MAX_SSID_LIST_LENGTH *					\
		(sizeof(struct mwifiex_ie_types_wildcard_ssid_params)	\
			+ IEEE80211_MAX_SSID_LEN))

/* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
#define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config)        \
				+ sizeof(struct mwifiex_ie_types_num_probes)   \
				+ sizeof(struct mwifiex_ie_types_htcap)       \
				+ CHAN_TLV_MAX_SIZE                 \
				+ RATE_TLV_MAX_SIZE                 \
				+ WILDCARD_SSID_TLV_MAX_SIZE)


union mwifiex_scan_cmd_config_tlv {
	/* Scan configuration (variable length) */
	struct mwifiex_scan_cmd_config config;
	/* Max allocated block */
	u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
};

enum cipher_suite {
	CIPHER_SUITE_TKIP,
	CIPHER_SUITE_CCMP,
	CIPHER_SUITE_MAX
};
static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = {
	{ 0x00, 0x50, 0xf2, 0x02 },	/* TKIP */
	{ 0x00, 0x50, 0xf2, 0x04 },	/* AES  */
};
static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = {
	{ 0x00, 0x0f, 0xac, 0x02 },	/* TKIP */
	{ 0x00, 0x0f, 0xac, 0x04 },	/* AES  */
};

/*
 * This function parses a given IE for a given OUI.
 *
 * This is used to parse a WPA/RSN IE to find if it has
 * a given oui in PTK.
 */
static u8
mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui)
{
	u8 count;

	count = iebody->ptk_cnt[0];

	/* There could be multiple OUIs for PTK hence
	   1) Take the length.
	   2) Check all the OUIs for AES.
	   3) If one of them is AES then pass success. */
	while (count) {
		if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body)))
			return MWIFIEX_OUI_PRESENT;

		--count;
		if (count)
			iebody = (struct ie_body *) ((u8 *) iebody +
						sizeof(iebody->ptk_body));
	}

	pr_debug("info: %s: OUI is not found in PTK\n", __func__);
	return MWIFIEX_OUI_NOT_PRESENT;
}

/*
 * This function checks if a given OUI is present in a RSN IE.
 *
 * The function first checks if a RSN IE is present or not in the
 * BSS descriptor. It tries to locate the OUI only if such an IE is
 * present.
 */
static u8
mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
{
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	u8 *oui;
	struct ie_body *iebody;
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	u8 ret = MWIFIEX_OUI_NOT_PRESENT;

	if (((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).
					ieee_hdr.element_id == WLAN_EID_RSN))) {
		iebody = (struct ie_body *)
			 (((u8 *) bss_desc->bcn_rsn_ie->data) +
			 RSN_GTK_OUI_OFFSET);
		oui = &mwifiex_rsn_oui[cipher][0];
		ret = mwifiex_search_oui_in_ie(iebody, oui);
		if (ret)
			return ret;
	}
	return ret;
}

/*
 * This function checks if a given OUI is present in a WPA IE.
 *
 * The function first checks if a WPA IE is present or not in the
 * BSS descriptor. It tries to locate the OUI only if such an IE is
 * present.
 */
static u8
mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
{
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	u8 *oui;
	struct ie_body *iebody;
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	u8 ret = MWIFIEX_OUI_NOT_PRESENT;

	if (((bss_desc->bcn_wpa_ie) && ((*(bss_desc->bcn_wpa_ie)).
				      vend_hdr.element_id == WLAN_EID_WPA))) {
		iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
		oui = &mwifiex_wpa_oui[cipher][0];
		ret = mwifiex_search_oui_in_ie(iebody, oui);
		if (ret)
			return ret;
	}
	return ret;
}

/*
 * This function compares two SSIDs and checks if they match.
 */
s32
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mwifiex_ssid_cmp(struct cfg80211_ssid *ssid1, struct cfg80211_ssid *ssid2)
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{
	if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
		return -1;
	return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
}

/*
 * This function checks if wapi is enabled in driver and scanned network is
 * compatible with it.
 */
static bool
mwifiex_is_network_compatible_for_wapi(struct mwifiex_private *priv,
				       struct mwifiex_bssdescriptor *bss_desc)
{
	if (priv->sec_info.wapi_enabled &&
	    (bss_desc->bcn_wapi_ie &&
	     ((*(bss_desc->bcn_wapi_ie)).ieee_hdr.element_id ==
			WLAN_EID_BSS_AC_ACCESS_DELAY))) {
		return true;
	}
	return false;
}

/*
 * This function checks if driver is configured with no security mode and
 * scanned network is compatible with it.
 */
static bool
mwifiex_is_network_compatible_for_no_sec(struct mwifiex_private *priv,
				       struct mwifiex_bssdescriptor *bss_desc)
{
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	if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
	    !priv->sec_info.wpa2_enabled && ((!bss_desc->bcn_wpa_ie) ||
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		((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id !=
	    WLAN_EID_WPA))
	    && ((!bss_desc->bcn_rsn_ie) ||
		((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id !=
	    WLAN_EID_RSN))
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	    && !priv->sec_info.encryption_mode
	    && !bss_desc->privacy) {
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		return true;
	}
	return false;
}

/*
 * This function checks if static WEP is enabled in driver and scanned network
 * is compatible with it.
 */
static bool
mwifiex_is_network_compatible_for_static_wep(struct mwifiex_private *priv,
				       struct mwifiex_bssdescriptor *bss_desc)
{
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	if (priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
	    !priv->sec_info.wpa2_enabled && bss_desc->privacy) {
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		return true;
	}
	return false;
}

/*
 * This function checks if wpa is enabled in driver and scanned network is
 * compatible with it.
 */
static bool
mwifiex_is_network_compatible_for_wpa(struct mwifiex_private *priv,
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				      struct mwifiex_bssdescriptor *bss_desc)
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{
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	if (!priv->sec_info.wep_enabled && priv->sec_info.wpa_enabled &&
	    !priv->sec_info.wpa2_enabled && ((bss_desc->bcn_wpa_ie) &&
	    ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id == WLAN_EID_WPA))
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	   /*
	    * Privacy bit may NOT be set in some APs like
	    * LinkSys WRT54G && bss_desc->privacy
	    */
	 ) {
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		dev_dbg(priv->adapter->dev, "info: %s: WPA:"
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			" wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
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			"EncMode=%#x privacy=%#x\n", __func__,
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			(bss_desc->bcn_wpa_ie) ?
			(*(bss_desc->bcn_wpa_ie)).
			vend_hdr.element_id : 0,
			(bss_desc->bcn_rsn_ie) ?
			(*(bss_desc->bcn_rsn_ie)).
			ieee_hdr.element_id : 0,
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			(priv->sec_info.wep_enabled) ? "e" : "d",
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			(priv->sec_info.wpa_enabled) ? "e" : "d",
			(priv->sec_info.wpa2_enabled) ? "e" : "d",
			priv->sec_info.encryption_mode,
			bss_desc->privacy);
		return true;
	}
	return false;
}

/*
 * This function checks if wpa2 is enabled in driver and scanned network is
 * compatible with it.
 */
static bool
mwifiex_is_network_compatible_for_wpa2(struct mwifiex_private *priv,
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				       struct mwifiex_bssdescriptor *bss_desc)
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{
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	if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
	    priv->sec_info.wpa2_enabled && ((bss_desc->bcn_rsn_ie) &&
	    ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id == WLAN_EID_RSN))
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	   /*
	    * Privacy bit may NOT be set in some APs like
	    * LinkSys WRT54G && bss_desc->privacy
	    */
	 ) {
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		dev_dbg(priv->adapter->dev, "info: %s: WPA2: "
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			" wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
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			"EncMode=%#x privacy=%#x\n", __func__,
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			(bss_desc->bcn_wpa_ie) ?
			(*(bss_desc->bcn_wpa_ie)).
			vend_hdr.element_id : 0,
			(bss_desc->bcn_rsn_ie) ?
			(*(bss_desc->bcn_rsn_ie)).
			ieee_hdr.element_id : 0,
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			(priv->sec_info.wep_enabled) ? "e" : "d",
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			(priv->sec_info.wpa_enabled) ? "e" : "d",
			(priv->sec_info.wpa2_enabled) ? "e" : "d",
			priv->sec_info.encryption_mode,
			bss_desc->privacy);
		return true;
	}
	return false;
}

/*
 * This function checks if adhoc AES is enabled in driver and scanned network is
 * compatible with it.
 */
static bool
mwifiex_is_network_compatible_for_adhoc_aes(struct mwifiex_private *priv,
				       struct mwifiex_bssdescriptor *bss_desc)
{
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	if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
	    !priv->sec_info.wpa2_enabled && ((!bss_desc->bcn_wpa_ie) ||
	    ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id != WLAN_EID_WPA))
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	    && ((!bss_desc->bcn_rsn_ie) || ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.
		   element_id != WLAN_EID_RSN))
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	    && !priv->sec_info.encryption_mode
	    && bss_desc->privacy) {
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		return true;
	}
	return false;
}

/*
 * This function checks if dynamic WEP is enabled in driver and scanned network
 * is compatible with it.
 */
static bool
mwifiex_is_network_compatible_for_dynamic_wep(struct mwifiex_private *priv,
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				       struct mwifiex_bssdescriptor *bss_desc)
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{
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	if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
	    !priv->sec_info.wpa2_enabled && ((!bss_desc->bcn_wpa_ie) ||
	    ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id != WLAN_EID_WPA))
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	    && ((!bss_desc->bcn_rsn_ie) || ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.
		   element_id != WLAN_EID_RSN))
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	    && priv->sec_info.encryption_mode
	    && bss_desc->privacy) {
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		dev_dbg(priv->adapter->dev, "info: %s: dynamic "
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			"WEP: wpa_ie=%#x wpa2_ie=%#x "
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			"EncMode=%#x privacy=%#x\n",
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			__func__,
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			(bss_desc->bcn_wpa_ie) ?
			(*(bss_desc->bcn_wpa_ie)).
			vend_hdr.element_id : 0,
			(bss_desc->bcn_rsn_ie) ?
			(*(bss_desc->bcn_rsn_ie)).
			ieee_hdr.element_id : 0,
			priv->sec_info.encryption_mode,
			bss_desc->privacy);
		return true;
	}
	return false;
}

/*
 * This function checks if a scanned network is compatible with the driver
 * settings.
 *
 *   WEP     WPA    WPA2   ad-hoc encrypt                  Network
 * enabled enabled enabled  AES    mode   Privacy WPA WPA2 Compatible
 *    0       0       0      0     NONE      0     0   0   yes No security
 *    0       1       0      0      x        1x    1   x   yes WPA (disable
 *                                                         HT if no AES)
 *    0       0       1      0      x        1x    x   1   yes WPA2 (disable
 *                                                         HT if no AES)
 *    0       0       0      1     NONE      1     0   0   yes Ad-hoc AES
 *    1       0       0      0     NONE      1     0   0   yes Static WEP
 *                                                         (disable HT)
 *    0       0       0      0    !=NONE     1     0   0   yes Dynamic WEP
 *
 * Compatibility is not matched while roaming, except for mode.
 */
static s32
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mwifiex_is_network_compatible(struct mwifiex_private *priv,
			      struct mwifiex_bssdescriptor *bss_desc, u32 mode)
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{
	struct mwifiex_adapter *adapter = priv->adapter;

	bss_desc->disable_11n = false;

	/* Don't check for compatibility if roaming */
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	if (priv->media_connected && (priv->bss_mode == NL80211_IFTYPE_STATION)
	    && (bss_desc->bss_mode == NL80211_IFTYPE_STATION))
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		return 0;
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	if (priv->wps.session_enable) {
		dev_dbg(adapter->dev,
			"info: return success directly in WPS period\n");
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		return 0;
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	}

	if (mwifiex_is_network_compatible_for_wapi(priv, bss_desc)) {
		dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
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		return 0;
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	}

	if (bss_desc->bss_mode == mode) {
		if (mwifiex_is_network_compatible_for_no_sec(priv, bss_desc)) {
			/* No security */
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			return 0;
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		} else if (mwifiex_is_network_compatible_for_static_wep(priv,
								bss_desc)) {
			/* Static WEP enabled */
			dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n");
			bss_desc->disable_11n = true;
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			return 0;
		} else if (mwifiex_is_network_compatible_for_wpa(priv,
								 bss_desc)) {
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			/* WPA enabled */
			if (((priv->adapter->config_bands & BAND_GN
			      || priv->adapter->config_bands & BAND_AN)
			      && bss_desc->bcn_ht_cap)
			      && !mwifiex_is_wpa_oui_present(bss_desc,
					CIPHER_SUITE_CCMP)) {

				if (mwifiex_is_wpa_oui_present(bss_desc,
					    CIPHER_SUITE_TKIP)) {
					dev_dbg(adapter->dev,
						"info: Disable 11n if AES "
						"is not supported by AP\n");
					bss_desc->disable_11n = true;
				} else {
					return -1;
				}
			}
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			return 0;
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		} else if (mwifiex_is_network_compatible_for_wpa2(priv,
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							bss_desc)) {
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			/* WPA2 enabled */
			if (((priv->adapter->config_bands & BAND_GN
			      || priv->adapter->config_bands & BAND_AN)
			      && bss_desc->bcn_ht_cap)
			      && !mwifiex_is_rsn_oui_present(bss_desc,
					CIPHER_SUITE_CCMP)) {

				if (mwifiex_is_rsn_oui_present(bss_desc,
					    CIPHER_SUITE_TKIP)) {
					dev_dbg(adapter->dev,
						"info: Disable 11n if AES "
						"is not supported by AP\n");
					bss_desc->disable_11n = true;
				} else {
					return -1;
				}
			}
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			return 0;
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		} else if (mwifiex_is_network_compatible_for_adhoc_aes(priv,
								bss_desc)) {
			/* Ad-hoc AES enabled */
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			return 0;
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		} else if (mwifiex_is_network_compatible_for_dynamic_wep(priv,
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							bss_desc)) {
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			/* Dynamic WEP enabled */
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			return 0;
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		}

		/* Security doesn't match */
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		dev_dbg(adapter->dev, "info: %s: failed: "
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		       "wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s EncMode"
		       "=%#x privacy=%#x\n",
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		       __func__,
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		       (bss_desc->bcn_wpa_ie) ?
		       (*(bss_desc->bcn_wpa_ie)).vend_hdr.
		       element_id : 0,
		       (bss_desc->bcn_rsn_ie) ?
		       (*(bss_desc->bcn_rsn_ie)).ieee_hdr.
		       element_id : 0,
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		       (priv->sec_info.wep_enabled) ? "e" : "d",
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		       (priv->sec_info.wpa_enabled) ? "e" : "d",
		       (priv->sec_info.wpa2_enabled) ? "e" : "d",
		       priv->sec_info.encryption_mode, bss_desc->privacy);
		return -1;
	}

	/* Mode doesn't match */
	return -1;
}

/*
 * This function creates a channel list for the driver to scan, based
 * on region/band information.
 *
 * This routine is used for any scan that is not provided with a
 * specific channel list to scan.
 */
static void
mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
				const struct mwifiex_user_scan_cfg
				*user_scan_in,
				struct mwifiex_chan_scan_param_set
				*scan_chan_list,
				u8 filtered_scan)
{
	enum ieee80211_band band;
	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *ch;
	struct mwifiex_adapter *adapter = priv->adapter;
	int chan_idx = 0, i;

	for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) {

		if (!priv->wdev->wiphy->bands[band])
			continue;

		sband = priv->wdev->wiphy->bands[band];

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		for (i = 0; (i < sband->n_channels) ; i++) {
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			ch = &sband->channels[i];
			if (ch->flags & IEEE80211_CHAN_DISABLED)
				continue;
			scan_chan_list[chan_idx].radio_type = band;
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			if (user_scan_in &&
				user_scan_in->chan_list[0].scan_time)
				scan_chan_list[chan_idx].max_scan_time =
					cpu_to_le16((u16) user_scan_in->
					chan_list[0].scan_time);
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			else if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
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				scan_chan_list[chan_idx].max_scan_time =
					cpu_to_le16(adapter->passive_scan_time);
			else
				scan_chan_list[chan_idx].max_scan_time =
					cpu_to_le16(adapter->active_scan_time);
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			if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
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				scan_chan_list[chan_idx].chan_scan_mode_bitmap
					|= MWIFIEX_PASSIVE_SCAN;
			else
				scan_chan_list[chan_idx].chan_scan_mode_bitmap
					&= ~MWIFIEX_PASSIVE_SCAN;
			scan_chan_list[chan_idx].chan_number =
							(u32) ch->hw_value;
			if (filtered_scan) {
				scan_chan_list[chan_idx].max_scan_time =
				cpu_to_le16(adapter->specific_scan_time);
				scan_chan_list[chan_idx].chan_scan_mode_bitmap
					|= MWIFIEX_DISABLE_CHAN_FILT;
			}
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			chan_idx++;
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		}

	}
}

/*
 * This function constructs and sends multiple scan config commands to
 * the firmware.
 *
 * Previous routines in the code flow have created a scan command configuration
 * with any requested TLVs.  This function splits the channel TLV into maximum
 * channels supported per scan lists and sends the portion of the channel TLV,
 * along with the other TLVs, to the firmware.
 */
static int
549
mwifiex_scan_channel_list(struct mwifiex_private *priv,
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			  u32 max_chan_per_scan, u8 filtered_scan,
			  struct mwifiex_scan_cmd_config *scan_cfg_out,
			  struct mwifiex_ie_types_chan_list_param_set
			  *chan_tlv_out,
			  struct mwifiex_chan_scan_param_set *scan_chan_list)
{
	int ret = 0;
	struct mwifiex_chan_scan_param_set *tmp_chan_list;
	struct mwifiex_chan_scan_param_set *start_chan;

	u32 tlv_idx;
	u32 total_scan_time;
	u32 done_early;

	if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
		dev_dbg(priv->adapter->dev,
			"info: Scan: Null detect: %p, %p, %p\n",
		       scan_cfg_out, chan_tlv_out, scan_chan_list);
		return -1;
	}

	chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);

	/* Set the temp channel struct pointer to the start of the desired
	   list */
	tmp_chan_list = scan_chan_list;

	/* Loop through the desired channel list, sending a new firmware scan
	   commands for each max_chan_per_scan channels (or for 1,6,11
	   individually if configured accordingly) */
	while (tmp_chan_list->chan_number) {

		tlv_idx = 0;
		total_scan_time = 0;
		chan_tlv_out->header.len = 0;
		start_chan = tmp_chan_list;
		done_early = false;

		/*
		 * Construct the Channel TLV for the scan command.  Continue to
		 * insert channel TLVs until:
		 *   - the tlv_idx hits the maximum configured per scan command
		 *   - the next channel to insert is 0 (end of desired channel
		 *     list)
		 *   - done_early is set (controlling individual scanning of
		 *     1,6,11)
		 */
		while (tlv_idx < max_chan_per_scan
		       && tmp_chan_list->chan_number && !done_early) {

			dev_dbg(priv->adapter->dev,
				"info: Scan: Chan(%3d), Radio(%d),"
				" Mode(%d, %d), Dur(%d)\n",
			       tmp_chan_list->chan_number,
			       tmp_chan_list->radio_type,
			       tmp_chan_list->chan_scan_mode_bitmap
			       & MWIFIEX_PASSIVE_SCAN,
			       (tmp_chan_list->chan_scan_mode_bitmap
			       & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
			       le16_to_cpu(tmp_chan_list->max_scan_time));

			/* Copy the current channel TLV to the command being
			   prepared */
			memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
			       tmp_chan_list,
			       sizeof(chan_tlv_out->chan_scan_param));

			/* Increment the TLV header length by the size
			   appended */
			chan_tlv_out->header.len =
			cpu_to_le16(le16_to_cpu(chan_tlv_out->header.len) +
			(sizeof(chan_tlv_out->chan_scan_param)));

			/*
			 * The tlv buffer length is set to the number of bytes
			 * of the between the channel tlv pointer and the start
			 * of the tlv buffer.  This compensates for any TLVs
			 * that were appended before the channel list.
			 */
			scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
							scan_cfg_out->tlv_buf);

			/* Add the size of the channel tlv header and the data
			   length */
			scan_cfg_out->tlv_buf_len +=
				(sizeof(chan_tlv_out->header)
				 + le16_to_cpu(chan_tlv_out->header.len));

			/* Increment the index to the channel tlv we are
			   constructing */
			tlv_idx++;

			/* Count the total scan time per command */
			total_scan_time +=
				le16_to_cpu(tmp_chan_list->max_scan_time);

			done_early = false;

			/* Stop the loop if the *current* channel is in the
			   1,6,11 set and we are not filtering on a BSSID
			   or SSID. */
			if (!filtered_scan && (tmp_chan_list->chan_number == 1
				|| tmp_chan_list->chan_number == 6
				|| tmp_chan_list->chan_number == 11))
				done_early = true;

			/* Increment the tmp pointer to the next channel to
			   be scanned */
			tmp_chan_list++;

			/* Stop the loop if the *next* channel is in the 1,6,11
			   set.  This will cause it to be the only channel
			   scanned on the next interation */
			if (!filtered_scan && (tmp_chan_list->chan_number == 1
				|| tmp_chan_list->chan_number == 6
				|| tmp_chan_list->chan_number == 11))
				done_early = true;
		}

		/* The total scan time should be less than scan command timeout
		   value */
		if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
			dev_err(priv->adapter->dev, "total scan time %dms"
				" is over limit (%dms), scan skipped\n",
				total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
			ret = -1;
			break;
		}

		priv->adapter->scan_channels = start_chan;

		/* Send the scan command to the firmware with the specified
		   cfg */
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		ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN,
					     HostCmd_ACT_GEN_SET, 0,
					     scan_cfg_out);
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		if (ret)
			break;
	}

	if (ret)
		return -1;

	return 0;
}

/*
 * This function constructs a scan command configuration structure to use
 * in scan commands.
 *
 * Application layer or other functions can invoke network scanning
 * with a scan configuration supplied in a user scan configuration structure.
 * This structure is used as the basis of one or many scan command configuration
 * commands that are sent to the command processing module and eventually to the
 * firmware.
 *
 * This function creates a scan command configuration structure  based on the
 * following user supplied parameters (if present):
 *      - SSID filter
 *      - BSSID filter
 *      - Number of Probes to be sent
 *      - Channel list
 *
 * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 * If the number of probes is not set, adapter default setting is used.
 */
static void
mwifiex_scan_setup_scan_config(struct mwifiex_private *priv,
			       const struct mwifiex_user_scan_cfg *user_scan_in,
			       struct mwifiex_scan_cmd_config *scan_cfg_out,
			       struct mwifiex_ie_types_chan_list_param_set
			       **chan_list_out,
			       struct mwifiex_chan_scan_param_set
			       *scan_chan_list,
			       u8 *max_chan_per_scan, u8 *filtered_scan,
			       u8 *scan_current_only)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	struct mwifiex_ie_types_num_probes *num_probes_tlv;
	struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
	struct mwifiex_ie_types_rates_param_set *rates_tlv;
	const u8 zero_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
	u8 *tlv_pos;
	u32 num_probes;
	u32 ssid_len;
	u32 chan_idx;
	u32 scan_type;
	u16 scan_dur;
	u8 channel;
	u8 radio_type;
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	int i;
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	u8 ssid_filter;
	u8 rates[MWIFIEX_SUPPORTED_RATES];
	u32 rates_size;
	struct mwifiex_ie_types_htcap *ht_cap;

	/* The tlv_buf_len is calculated for each scan command.  The TLVs added
	   in this routine will be preserved since the routine that sends the
	   command will append channelTLVs at *chan_list_out.  The difference
	   between the *chan_list_out and the tlv_buf start will be used to
	   calculate the size of anything we add in this routine. */
	scan_cfg_out->tlv_buf_len = 0;

	/* Running tlv pointer.  Assigned to chan_list_out at end of function
	   so later routines know where channels can be added to the command
	   buf */
	tlv_pos = scan_cfg_out->tlv_buf;

	/* Initialize the scan as un-filtered; the flag is later set to TRUE
	   below if a SSID or BSSID filter is sent in the command */
	*filtered_scan = false;

	/* Initialize the scan as not being only on the current channel.  If
	   the channel list is customized, only contains one channel, and is
	   the active channel, this is set true and data flow is not halted. */
	*scan_current_only = false;

	if (user_scan_in) {

		/* Default the ssid_filter flag to TRUE, set false under
		   certain wildcard conditions and qualified by the existence
		   of an SSID list before marking the scan as filtered */
		ssid_filter = true;

		/* Set the BSS type scan filter, use Adapter setting if
		   unset */
		scan_cfg_out->bss_mode =
			(user_scan_in->bss_mode ? (u8) user_scan_in->
			 bss_mode : (u8) adapter->scan_mode);

		/* Set the number of probes to send, use Adapter setting
		   if unset */
		num_probes =
			(user_scan_in->num_probes ? user_scan_in->
			 num_probes : adapter->scan_probes);

		/*
		 * Set the BSSID filter to the incoming configuration,
		 * if non-zero.  If not set, it will remain disabled
		 * (all zeros).
		 */
		memcpy(scan_cfg_out->specific_bssid,
		       user_scan_in->specific_bssid,
		       sizeof(scan_cfg_out->specific_bssid));

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		for (i = 0; i < user_scan_in->num_ssids; i++) {
			ssid_len = user_scan_in->ssid_list[i].ssid_len;
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			wildcard_ssid_tlv =
				(struct mwifiex_ie_types_wildcard_ssid_params *)
				tlv_pos;
			wildcard_ssid_tlv->header.type =
				cpu_to_le16(TLV_TYPE_WILDCARDSSID);
			wildcard_ssid_tlv->header.len = cpu_to_le16(
				(u16) (ssid_len + sizeof(wildcard_ssid_tlv->
							 max_ssid_length)));
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			/*
			 * max_ssid_length = 0 tells firmware to perform
			 * specific scan for the SSID filled, whereas
			 * max_ssid_length = IEEE80211_MAX_SSID_LEN is for
			 * wildcard scan.
			 */
			if (ssid_len)
				wildcard_ssid_tlv->max_ssid_length = 0;
			else
				wildcard_ssid_tlv->max_ssid_length =
							IEEE80211_MAX_SSID_LEN;
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			memcpy(wildcard_ssid_tlv->ssid,
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			       user_scan_in->ssid_list[i].ssid, ssid_len);
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			tlv_pos += (sizeof(wildcard_ssid_tlv->header)
				+ le16_to_cpu(wildcard_ssid_tlv->header.len));

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			dev_dbg(adapter->dev, "info: scan: ssid[%d]: %s, %d\n",
				i, wildcard_ssid_tlv->ssid,
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				wildcard_ssid_tlv->max_ssid_length);

			/* Empty wildcard ssid with a maxlen will match many or
			   potentially all SSIDs (maxlen == 32), therefore do
			   not treat the scan as
			   filtered. */
			if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
				ssid_filter = false;
		}

		/*
		 *  The default number of channels sent in the command is low to
		 *  ensure the response buffer from the firmware does not
		 *  truncate scan results.  That is not an issue with an SSID
		 *  or BSSID filter applied to the scan results in the firmware.
		 */
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		if ((i && ssid_filter)
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		    || memcmp(scan_cfg_out->specific_bssid, &zero_mac,
			      sizeof(zero_mac)))
			*filtered_scan = true;
	} else {
		scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
		num_probes = adapter->scan_probes;
	}

	/*
	 *  If a specific BSSID or SSID is used, the number of channels in the
	 *  scan command will be increased to the absolute maximum.
	 */
	if (*filtered_scan)
		*max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
	else
		*max_chan_per_scan = MWIFIEX_CHANNELS_PER_SCAN_CMD;

	/* If the input config or adapter has the number of Probes set,
	   add tlv */
	if (num_probes) {

		dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
						num_probes);

		num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
		num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
		num_probes_tlv->header.len =
			cpu_to_le16(sizeof(num_probes_tlv->num_probes));
		num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);

		tlv_pos += sizeof(num_probes_tlv->header) +
			le16_to_cpu(num_probes_tlv->header.len);

	}

	/* Append rates tlv */
	memset(rates, 0, sizeof(rates));

	rates_size = mwifiex_get_supported_rates(priv, rates);

	rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
	rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
	rates_tlv->header.len = cpu_to_le16((u16) rates_size);
	memcpy(rates_tlv->rates, rates, rates_size);
	tlv_pos += sizeof(rates_tlv->header) + rates_size;

	dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);

	if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info)
	    && (priv->adapter->config_bands & BAND_GN
		|| priv->adapter->config_bands & BAND_AN)) {
		ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
		memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
		ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
		ht_cap->header.len =
				cpu_to_le16(sizeof(struct ieee80211_ht_cap));
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		radio_type =
			mwifiex_band_to_radio_type(priv->adapter->config_bands);
		mwifiex_fill_cap_info(priv, radio_type, ht_cap);
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		tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
	}

	/* Append vendor specific IE TLV */
	mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);

	/*
	 * Set the output for the channel TLV to the address in the tlv buffer
	 *   past any TLVs that were added in this function (SSID, num_probes).
	 *   Channel TLVs will be added past this for each scan command,
	 *   preserving the TLVs that were previously added.
	 */
	*chan_list_out =
		(struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;

	if (user_scan_in && user_scan_in->chan_list[0].chan_number) {

		dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");

		for (chan_idx = 0;
		     chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX
		     && user_scan_in->chan_list[chan_idx].chan_number;
		     chan_idx++) {

			channel = user_scan_in->chan_list[chan_idx].chan_number;
			(scan_chan_list + chan_idx)->chan_number = channel;

			radio_type =
				user_scan_in->chan_list[chan_idx].radio_type;
			(scan_chan_list + chan_idx)->radio_type = radio_type;

			scan_type = user_scan_in->chan_list[chan_idx].scan_type;

			if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
				(scan_chan_list +
				 chan_idx)->chan_scan_mode_bitmap
					|= MWIFIEX_PASSIVE_SCAN;
			else
				(scan_chan_list +
				 chan_idx)->chan_scan_mode_bitmap
					&= ~MWIFIEX_PASSIVE_SCAN;

			if (user_scan_in->chan_list[chan_idx].scan_time) {
				scan_dur = (u16) user_scan_in->
					chan_list[chan_idx].scan_time;
			} else {
				if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
					scan_dur = adapter->passive_scan_time;
				else if (*filtered_scan)
					scan_dur = adapter->specific_scan_time;
				else
					scan_dur = adapter->active_scan_time;
			}

			(scan_chan_list + chan_idx)->min_scan_time =
				cpu_to_le16(scan_dur);
			(scan_chan_list + chan_idx)->max_scan_time =
				cpu_to_le16(scan_dur);
		}

		/* Check if we are only scanning the current channel */
		if ((chan_idx == 1)
		    && (user_scan_in->chan_list[0].chan_number
			== priv->curr_bss_params.bss_descriptor.channel)) {
			*scan_current_only = true;
			dev_dbg(adapter->dev,
				"info: Scan: Scanning current channel only\n");
		}

	} else {
		dev_dbg(adapter->dev,
				"info: Scan: Creating full region channel list\n");
		mwifiex_scan_create_channel_list(priv, user_scan_in,
						 scan_chan_list,
						 *filtered_scan);
	}
}

/*
 * This function inspects the scan response buffer for pointers to
 * expected TLVs.
 *
 * TLVs can be included at the end of the scan response BSS information.
 *
 * Data in the buffer is parsed pointers to TLVs that can potentially
 * be passed back in the response.
 */
static void
mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
				     struct mwifiex_ie_types_data *tlv,
				     u32 tlv_buf_size, u32 req_tlv_type,
				     struct mwifiex_ie_types_data **tlv_data)
{
	struct mwifiex_ie_types_data *current_tlv;
	u32 tlv_buf_left;
	u32 tlv_type;
	u32 tlv_len;

	current_tlv = tlv;
	tlv_buf_left = tlv_buf_size;
	*tlv_data = NULL;

	dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
						tlv_buf_size);

	while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {

		tlv_type = le16_to_cpu(current_tlv->header.type);
		tlv_len = le16_to_cpu(current_tlv->header.len);

		if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
			dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
			break;
		}

		if (req_tlv_type == tlv_type) {
			switch (tlv_type) {
			case TLV_TYPE_TSFTIMESTAMP:
				dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
					"timestamp TLV, len = %d\n", tlv_len);
				*tlv_data = (struct mwifiex_ie_types_data *)
					current_tlv;
				break;
			case TLV_TYPE_CHANNELBANDLIST:
				dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
					" band list TLV, len = %d\n", tlv_len);
				*tlv_data = (struct mwifiex_ie_types_data *)
					current_tlv;
				break;
			default:
				dev_err(adapter->dev,
					"SCAN_RESP: unhandled TLV = %d\n",
				       tlv_type);
				/* Give up, this seems corrupted */
				return;
			}
		}

		if (*tlv_data)
			break;


		tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
		current_tlv =
			(struct mwifiex_ie_types_data *) (current_tlv->data +
							  tlv_len);

	}			/* while */
}

/*
1054
1055
 * This function parses provided beacon buffer and updates
 * respective fields in bss descriptor structure.
1056
 */
1057
1058
1059
1060
int
mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
				struct mwifiex_bssdescriptor *bss_entry,
				u8 *ie_buf, u32 ie_len)
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
{
	int ret = 0;
	u8 element_id;
	struct ieee_types_fh_param_set *fh_param_set;
	struct ieee_types_ds_param_set *ds_param_set;
	struct ieee_types_cf_param_set *cf_param_set;
	struct ieee_types_ibss_param_set *ibss_param_set;
	u8 *current_ptr;
	u8 *rate;
	u8 element_len;
	u16 total_ie_len;
	u8 bytes_to_copy;
	u8 rate_size;
	u8 found_data_rate_ie;
1075
	u32 bytes_left;
1076
1077
1078
1079
1080
1081
	struct ieee_types_vendor_specific *vendor_ie;
	const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
	const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };

	found_data_rate_ie = false;
	rate_size = 0;
1082
1083
1084
1085
	current_ptr = ie_buf;
	bytes_left = ie_len;
	bss_entry->beacon_buf = ie_buf;
	bss_entry->beacon_buf_size = ie_len;
1086
1087

	/* Process variable IE */
1088
	while (bytes_left >= 2) {
1089
1090
1091
1092
		element_id = *current_ptr;
		element_len = *(current_ptr + 1);
		total_ie_len = element_len + sizeof(struct ieee_types_header);

1093
		if (bytes_left < total_ie_len) {
1094
1095
			dev_err(adapter->dev, "err: InterpretIE: in processing"
				" IE, bytes left < IE length\n");
1096
			return -1;
1097
1098
1099
1100
1101
1102
		}
		switch (element_id) {
		case WLAN_EID_SSID:
			bss_entry->ssid.ssid_len = element_len;
			memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
			       element_len);
1103
1104
			dev_dbg(adapter->dev, "info: InterpretIE: ssid: "
					      "%-32s\n", bss_entry->ssid.ssid);
1105
1106
1107
1108
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1110
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1234
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1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
			break;

		case WLAN_EID_SUPP_RATES:
			memcpy(bss_entry->data_rates, current_ptr + 2,
			       element_len);
			memcpy(bss_entry->supported_rates, current_ptr + 2,
			       element_len);
			rate_size = element_len;
			found_data_rate_ie = true;
			break;

		case WLAN_EID_FH_PARAMS:
			fh_param_set =
				(struct ieee_types_fh_param_set *) current_ptr;
			memcpy(&bss_entry->phy_param_set.fh_param_set,
			       fh_param_set,
			       sizeof(struct ieee_types_fh_param_set));
			break;

		case WLAN_EID_DS_PARAMS:
			ds_param_set =
				(struct ieee_types_ds_param_set *) current_ptr;

			bss_entry->channel = ds_param_set->current_chan;

			memcpy(&bss_entry->phy_param_set.ds_param_set,
			       ds_param_set,
			       sizeof(struct ieee_types_ds_param_set));
			break;

		case WLAN_EID_CF_PARAMS:
			cf_param_set =
				(struct ieee_types_cf_param_set *) current_ptr;
			memcpy(&bss_entry->ss_param_set.cf_param_set,
			       cf_param_set,
			       sizeof(struct ieee_types_cf_param_set));
			break;

		case WLAN_EID_IBSS_PARAMS:
			ibss_param_set =
				(struct ieee_types_ibss_param_set *)
				current_ptr;
			memcpy(&bss_entry->ss_param_set.ibss_param_set,
			       ibss_param_set,
			       sizeof(struct ieee_types_ibss_param_set));
			break;

		case WLAN_EID_ERP_INFO:
			bss_entry->erp_flags = *(current_ptr + 2);
			break;

		case WLAN_EID_EXT_SUPP_RATES:
			/*
			 * Only process extended supported rate
			 * if data rate is already found.
			 * Data rate IE should come before
			 * extended supported rate IE
			 */
			if (found_data_rate_ie) {
				if ((element_len + rate_size) >
				    MWIFIEX_SUPPORTED_RATES)
					bytes_to_copy =
						(MWIFIEX_SUPPORTED_RATES -
						 rate_size);
				else
					bytes_to_copy = element_len;

				rate = (u8 *) bss_entry->data_rates;
				rate += rate_size;
				memcpy(rate, current_ptr + 2, bytes_to_copy);

				rate = (u8 *) bss_entry->supported_rates;
				rate += rate_size;
				memcpy(rate, current_ptr + 2, bytes_to_copy);
			}
			break;

		case WLAN_EID_VENDOR_SPECIFIC:
			vendor_ie = (struct ieee_types_vendor_specific *)
					current_ptr;

			if (!memcmp
			    (vendor_ie->vend_hdr.oui, wpa_oui,
			     sizeof(wpa_oui))) {
				bss_entry->bcn_wpa_ie =
					(struct ieee_types_vendor_specific *)
					current_ptr;
				bss_entry->wpa_offset = (u16) (current_ptr -
							bss_entry->beacon_buf);
			} else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
				    sizeof(wmm_oui))) {
				if (total_ie_len ==
				    sizeof(struct ieee_types_wmm_parameter)
				    || total_ie_len ==
				    sizeof(struct ieee_types_wmm_info))
					/*
					 * Only accept and copy the WMM IE if
					 * it matches the size expected for the
					 * WMM Info IE or the WMM Parameter IE.
					 */
					memcpy((u8 *) &bss_entry->wmm_ie,
					       current_ptr, total_ie_len);
			}
			break;
		case WLAN_EID_RSN:
			bss_entry->bcn_rsn_ie =
				(struct ieee_types_generic *) current_ptr;
			bss_entry->rsn_offset = (u16) (current_ptr -
							bss_entry->beacon_buf);
			break;
		case WLAN_EID_BSS_AC_ACCESS_DELAY:
			bss_entry->bcn_wapi_ie =
				(struct ieee_types_generic *) current_ptr;
			bss_entry->wapi_offset = (u16) (current_ptr -
							bss_entry->beacon_buf);
			break;
		case WLAN_EID_HT_CAPABILITY:
			bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
					(current_ptr +
					sizeof(struct ieee_types_header));
			bss_entry->ht_cap_offset = (u16) (current_ptr +
					sizeof(struct ieee_types_header) -
					bss_entry->beacon_buf);
			break;
		case WLAN_EID_HT_INFORMATION:
			bss_entry->bcn_ht_info = (struct ieee80211_ht_info *)
					(current_ptr +
					sizeof(struct ieee_types_header));
			bss_entry->ht_info_offset = (u16) (current_ptr +
					sizeof(struct ieee_types_header) -
					bss_entry->beacon_buf);
			break;
		case WLAN_EID_BSS_COEX_2040:
			bss_entry->bcn_bss_co_2040 = (u8 *) (current_ptr +
					sizeof(struct ieee_types_header));
			bss_entry->bss_co_2040_offset = (u16) (current_ptr +
					sizeof(struct ieee_types_header) -
						bss_entry->beacon_buf);
			break;
		case WLAN_EID_EXT_CAPABILITY:
			bss_entry->bcn_ext_cap = (u8 *) (current_ptr +
					sizeof(struct ieee_types_header));
			bss_entry->ext_cap_offset = (u16) (current_ptr +
					sizeof(struct ieee_types_header) -
					bss_entry->beacon_buf);
			break;
		default:
			break;
		}

		current_ptr += element_len + 2;

		/* Need to account for IE ID and IE Len */
1258
		bytes_left -= (element_len + 2);
1259

1260
	}	/* while (bytes_left > 2) */
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
	return ret;
}

/*
 * This function converts radio type scan parameter to a band configuration
 * to be used in join command.
 */
static u8
mwifiex_radio_type_to_band(u8 radio_type)
{
	switch (radio_type) {
	case HostCmd_SCAN_RADIO_TYPE_A:
1273
		return BAND_A;
1274
1275
	case HostCmd_SCAN_RADIO_TYPE_BG:
	default:
1276
		return BAND_G;
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
	}
}

/*
 * This is an internal function used to start a scan based on an input
 * configuration.
 *
 * This uses the input user scan configuration information when provided in
 * order to send the appropriate scan commands to firmware to populate or
 * update the internal driver scan table.
 */
1288
1289
static int mwifiex_scan_networks(struct mwifiex_private *priv,
		const struct mwifiex_user_scan_cfg *user_scan_in)
1290
1291
1292
{
	int ret = 0;
	struct mwifiex_adapter *adapter = priv->adapter;
1293
1294
	struct cmd_ctrl_node *cmd_node;
	union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1295
1296
1297
1298
1299
1300
1301
1302
	struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
	u32 buf_size;
	struct mwifiex_chan_scan_param_set *scan_chan_list;
	u8 filtered_scan;
	u8 scan_current_chan_only;
	u8 max_chan_per_scan;
	unsigned long flags;

1303
	if (adapter->scan_processing) {
1304
1305
1306
1307
1308
1309
1310
1311
		dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
		return ret;
	}

	spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
	adapter->scan_processing = true;
	spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);

1312
	if (priv->scan_block) {
1313
1314
1315
1316
1317
1318
1319
1320
1321
		dev_dbg(adapter->dev,
			"cmd: Scan is blocked during association...\n");
		return ret;
	}

	scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
					GFP_KERNEL);
	if (!scan_cfg_out) {
		dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1322
		return -ENOMEM;
1323
1324
1325
1326
1327
1328
1329
1330
	}

	buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
			MWIFIEX_USER_SCAN_CHAN_MAX;
	scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
	if (!scan_chan_list) {
		dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
		kfree(scan_cfg_out);
1331
		return -ENOMEM;
1332
1333
1334
1335
1336
1337
1338
	}

	mwifiex_scan_setup_scan_config(priv, user_scan_in,
				       &scan_cfg_out->config, &chan_list_out,
				       scan_chan_list, &max_chan_per_scan,
				       &filtered_scan, &scan_current_chan_only);

1339
1340
1341
	ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
					&scan_cfg_out->config, chan_list_out,
					scan_chan_list);
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351

	/* Get scan command from scan_pending_q and put to cmd_pending_q */
	if (!ret) {
		spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
		if (!list_empty(&adapter->scan_pending_q)) {
			cmd_node = list_first_entry(&adapter->scan_pending_q,
						struct cmd_ctrl_node, list);
			list_del(&cmd_node->list);
			spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
									flags);
1352
			adapter->cmd_queued = cmd_node;
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
			mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
							true);
		} else {
			spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
					       flags);
		}
	} else {
		spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
		adapter->scan_processing = true;
		spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
	}

	kfree(scan_cfg_out);
	kfree(scan_chan_list);
	return ret;
}

1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
/*
 * Sends IOCTL request to start a scan with user configurations.
 *
 * This function allocates the IOCTL request buffer, fills it
 * with requisite parameters and calls the IOCTL handler.
 *
 * Upon completion, it also generates a wireless event to notify
 * applications.
 */
int mwifiex_set_user_scan_ioctl(struct mwifiex_private *priv,
				struct mwifiex_user_scan_cfg *scan_req)
{
	int status;

	status = mwifiex_scan_networks(priv, scan_req);
1385
	queue_work(priv->adapter->workqueue, &priv->adapter->main_work);
1386
1387
1388
1389

	return status;
}

1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
/*
 * This function prepares a scan command to be sent to the firmware.
 *
 * This uses the scan command configuration sent to the command processing
 * module in command preparation stage to configure a scan command structure
 * to send to firmware.
 *
 * The fixed fields specifying the BSS type and BSSID filters as well as a
 * variable number/length of TLVs are sent in the command to firmware.
 *
 * Preparation also includes -
 *      - Setting command ID, and proper size
 *      - Ensuring correct endian-ness
 */
1404
1405
int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
			    struct mwifiex_scan_cmd_config *scan_cfg)
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
{
	struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;

	/* Set fixed field variables in scan command */
	scan_cmd->bss_mode = scan_cfg->bss_mode;
	memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
	       sizeof(scan_cmd->bssid));
	memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);

	cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);

	/* Size is equal to the sizeof(fixed portions) + the TLV len + header */
	cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
					  + sizeof(scan_cmd->bssid)
					  + scan_cfg->tlv_buf_len + S_DS_GEN));

	return 0;
}

1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
/*
 * This function checks compatibility of requested network with current
 * driver settings.
 */
int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
					struct mwifiex_bssdescriptor *bss_desc)
{
	int ret = -1;

	if (!bss_desc)
		return -1;

	if ((mwifiex_get_cfp_by_band_and_channel_from_cfg80211(priv,
			(u8) bss_desc->bss_band, (u16) bss_desc->channel))) {
		switch (priv->bss_mode) {
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_ADHOC:
			ret = mwifiex_is_network_compatible(priv, bss_desc,
							    priv->bss_mode);
			if (ret)
				dev_err(priv->adapter->dev, "cannot find ssid "
					"%s\n", bss_desc->ssid.ssid);
				break;
		default:
				ret = 0;
		}
	}

	return ret;
}

static int
1457
1458
1459
mwifiex_update_curr_bss_params(struct mwifiex_private *priv, u8 *bssid,
			       s32 rssi, const u8 *ie_buf, size_t ie_len,
			       u16 beacon_period, u16 cap_info_bitmap, u8 band)
1460
{
1461
	struct mwifiex_bssdescriptor *bss_desc;
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
	int ret;
	unsigned long flags;
	u8 *beacon_ie;

	/* Allocate and fill new bss descriptor */
	bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
			GFP_KERNEL);
	if (!bss_desc) {
		dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
		return -ENOMEM;
	}
1473
1474

	beacon_ie = kmemdup(ie_buf, ie_len, GFP_KERNEL);
1475
	if (!beacon_ie) {
1476
		kfree(bss_desc);
1477
		dev_err(priv->adapter->dev, " failed to alloc beacon_ie\n");
1478
1479
1480
1481
1482
		return -ENOMEM;
	}

	ret = mwifiex_fill_new_bss_desc(priv, bssid, rssi, beacon_ie,
					ie_len, beacon_period,
1483
					cap_info_bitmap, band, bss_desc);
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
	if (ret)
		goto done;

	ret = mwifiex_check_network_compatibility(priv, bss_desc);
	if (ret)
		goto done;

	/* Update current bss descriptor parameters */
	spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
	priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
	priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
	priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
	priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
	priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
	priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
	priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
	priv->curr_bss_params.bss_descriptor.ht_cap_offset =
		0;
	priv->curr_bss_params.bss_descriptor.bcn_ht_info = NULL;
	priv->curr_bss_params.bss_descriptor.ht_info_offset =
		0;
	priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
		NULL;
	priv->curr_bss_params.bss_descriptor.
		bss_co_2040_offset = 0;
	priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
	priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
	priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
	priv->curr_bss_params.bss_descriptor.beacon_buf_size =
		0;

	/* Make a copy of current BSSID descriptor */
	memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
		sizeof(priv->curr_bss_params.bss_descriptor));
	mwifiex_save_curr_bcn(priv);
	spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);

done:
	kfree(bss_desc);
	kfree(beacon_ie);
	return 0;
}

1527
1528
1529
1530
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1532
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1534
1535
1536
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1538
1539
1540
1541
1542
1543
1544
1545
1546
/*
 * This function handles the command response of scan.
 *
 * The response buffer for the scan command has the following
 * memory layout:
 *
 *      .-------------------------------------------------------------.
 *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
 *      .-------------------------------------------------------------.
 *      |  BufSize (t_u16) : sizeof the BSS Description data          |
 *      .-------------------------------------------------------------.
 *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
 *      .-------------------------------------------------------------.
 *      |  BSSDescription data (variable, size given in BufSize)      |
 *      .-------------------------------------------------------------.
 *      |  TLV data (variable, size calculated using Header->Size,    |
 *      |            BufSize and sizeof the fixed fields above)       |
 *      .-------------------------------------------------------------.
 */
int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1547
			    struct host_cmd_ds_command *resp)
1548
1549
1550
{
	int ret = 0;
	struct mwifiex_adapter *adapter = priv->adapter;
1551
1552
	struct cmd_ctrl_node *cmd_node;
	struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
	struct mwifiex_ie_types_data *tlv_data;
	struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
	u8 *bss_info;
	u32 scan_resp_size;
	u32 bytes_left;
	u32 idx;
	u32 tlv_buf_size;
	struct mwifiex_chan_freq_power *cfp;
	struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
	struct chan_band_param_set *chan_band;
	u8 is_bgscan_resp;
	unsigned long flags;
1565
	struct cfg80211_bss *bss;
1566
1567
1568
1569
1570
1571
1572
1573
1574

	is_bgscan_resp = (le16_to_cpu(resp->command)
		== HostCmd_CMD_802_11_BG_SCAN_QUERY);
	if (is_bgscan_resp)
		scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
	else
		scan_rsp = &resp->params.scan_resp;


1575
	if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
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1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
		dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
		       scan_rsp->number_of_sets);
		ret = -1;
		goto done;
	}

	bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
	dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
						bytes_left);

	scan_resp_size = le16_to_cpu(resp->size);

	dev_dbg(adapter->dev,
		"info: SCAN_RESP: returned %d APs before parsing\n",
	       scan_rsp->number_of_sets);

	bss_info = scan_rsp->bss_desc_and_tlv_buffer;

	/*
	 * The size of the TLV buffer is equal to the entire command response
	 *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
	 *   BSS Descriptions (bss_descript_size as bytesLef) and the command
	 *   response header (S_DS_GEN)
	 */
	tlv_buf_size = scan_resp_size - (bytes_left
					 + sizeof(scan_rsp->bss_descript_size)
					 + sizeof(scan_rsp->number_of_sets)
					 + S_DS_GEN);

	tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
						 bss_desc_and_tlv_buffer +
						 bytes_left);

	/* Search the TLV buffer space in the scan response for any valid
	   TLVs */
	mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
					     TLV_TYPE_TSFTIMESTAMP,
					     (struct mwifiex_ie_types_data **)
					     &tsf_tlv);

	/* Search the TLV buffer space in the scan response for any valid
	   TLVs */
	mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
					     TLV_TYPE_CHANNELBANDLIST,
					     (struct mwifiex_ie_types_data **)
					     &chan_band_tlv);

	for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1624
1625
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1632
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1635
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1637
1638
1639
1640
1641
1642
		u8 bssid[ETH_ALEN];
		s32 rssi;
		const u8 *ie_buf;
		size_t ie_len;
		int channel = -1;
		u64 network_tsf = 0;
		u16 beacon_size = 0;
		u32 curr_bcn_bytes;
		u32 freq;
		u16 beacon_period;
		u16 cap_info_bitmap;
		u8 *current_ptr;
		struct mwifiex_bcn_param *bcn_param;

		if (bytes_left >= sizeof(beacon_size)) {
			/* Extract & convert beacon size from command buffer */
			memcpy(&beacon_size, bss_info, sizeof(beacon_size));
			bytes_left -= sizeof(beacon_size);
			bss_info += sizeof(beacon_size);
1643
1644
		}

1645
1646
1647
1648
1649
		if (!beacon_size || beacon_size > bytes_left) {
			bss_info += bytes_left;
			bytes_left = 0;
			return -1;
		}
1650

1651
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		/* Initialize the current working beacon pointer for this BSS
		 * iteration */
		current_ptr = bss_info;

		/* Advance the return beacon pointer past the current beacon */
		bss_info += beacon_size;
		bytes_left -= beacon_size;

		curr_bcn_bytes = beacon_size;

		/*
		 * First 5 fields are bssid, RSSI, time stamp, beacon interval,
		 *   and capability information
		 */
		if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
			dev_err(adapter->dev, "InterpretIE: not enough bytes left\n");
			continue;
		}
		bcn_param = (struct mwifiex_bcn_param *)current_ptr;
		current_ptr += sizeof(*bcn_param);
		curr_bcn_bytes -= sizeof(*bcn_param);

		memcpy(bssid, bcn_param->bssid, ETH_ALEN);

		rssi = (s32) (bcn_param->rssi);
		dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%02X\n",
					rssi);

		beacon_period = le16_to_cpu(bcn_param->beacon_period);

		cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
		dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
				cap_info_bitmap);

		/* Rest of the current buffer are IE's */
		ie_buf = current_ptr;
		ie_len = curr_bcn_bytes;
		dev_dbg(adapter->dev, "info: InterpretIE: IELength for this AP"
				      " = %d\n", curr_bcn_bytes);

		while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
			u8 element_id, element_len;

			element_id = *current_ptr;
			element_len = *(current_ptr + 1);
			if (curr_bcn_bytes < element_len +
					sizeof(struct ieee_types_header)) {
				dev_err(priv->adapter->dev, "%s: in processing"
					" IE, bytes left < IE length\n",
					__func__);
				goto done;
1702
			}
1703
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1705
			if (element_id == WLAN_EID_DS_PARAMS) {
				channel = *(u8 *) (current_ptr +
					sizeof(struct ieee_types_header));
1706
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				break;
			}
1708
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1711
1712

			current_ptr += element_len +
					sizeof(struct ieee_types_header);
			curr_bcn_bytes -= element_len +
					sizeof(struct ieee_types_header);
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1720
		}

		/*
		 * If the TSF TLV was appended to the scan results, save this
		 * entry's TSF value in the networkTSF field.The networkTSF is
		 * the firmware's TSF value at the time the beacon or probe
		 * response was received.
		 */
1721
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1732
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1737
		if (tsf_tlv)
			memcpy(&network_tsf,
					&tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
					sizeof(network_tsf));

		if (channel != -1) {
			struct ieee80211_channel *chan;
			u8 band;

			band = BAND_G;
			if (chan_band_tlv) {
				chan_band =
					&chan_band_tlv->chan_band_param[idx];
				band = mwifiex_radio_type_to_band(
						chan_band->radio_type
						& (BIT(0) | BIT(1)));
			}
1738

1739
1740
			cfp = mwifiex_get_cfp_by_band_and_channel_from_cfg80211(
						priv, (u8)band, (u16)channel);
1741

1742
			freq = cfp ? cfp->freq : 0;
1743

1744
			chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1745

1746
			if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1747
1748
1749
1750
1751
				bss = cfg80211_inform_bss(priv->wdev->wiphy,
					      chan, bssid, network_tsf,
					      cap_info_bitmap, beacon_period,
					      ie_buf, ie_len, rssi, GFP_KERNEL);
				*(u8 *)bss->priv = band;
1752
				cfg80211_put_bss(bss);
1753

1754
1755
1756
1757
1758
1759
				if (priv->media_connected && !memcmp(bssid,
					priv->curr_bss_params.bss_descriptor
						     .mac_address, ETH_ALEN))
					mwifiex_update_curr_bss_params(priv,
							bssid, rssi, ie_buf,
							ie_len, beacon_period,
1760
							cap_info_bitmap, band);
1761
1762
1763
1764
1765
			}
		} else {
			dev_dbg(adapter->dev, "missing BSS channel IE\n");
		}
	}
1766
1767
1768
1769
1770
1771
1772
1773
1774

	spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
	if (list_empty(&adapter->scan_pending_q)) {
		spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
		spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
		adapter->scan_processing = false;
		spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);

		/* Need to indicate IOCTL complete */
1775
1776
		if (adapter->curr_cmd->wait_q_enabled) {
			adapter->cmd_wait_q.status = 0;
1777
			mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1778
1779
1780
1781
1782
1783
1784
1785
		}
		if (priv->report_scan_result)
			priv->report_scan_result = false;
		if (priv->scan_pending_on_block) {
			priv->scan_pending_on_block = false;
			up(&priv->async_sem);
		}

1786
1787
1788
1789
1790
1791
1792
1793
		if (priv->user_scan_cfg) {
			dev_dbg(priv->adapter->dev, "info: %s: sending scan "
							"results\n", __func__);
			cfg80211_scan_done(priv->scan_request, 0);
			priv->scan_request = NULL;
			kfree(priv->user_scan_cfg);
			priv->user_scan_cfg = NULL;
		}
1794
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1797
1798
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1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
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1811
1812
1813
1814
1815
1816
	} else {
		/* Get scan command from scan_pending_q and put to
		   cmd_pending_q */
		cmd_node = list_first_entry(&adapter->scan_pending_q,
					    struct cmd_ctrl_node, list);
		list_del(&cmd_node->list);
		spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);

		mwifiex_insert_cmd_to_pending_q(adapter, cmd_node, true);
	}

done:
	return ret;
}

/*
 * This function prepares command for background scan query.
 *
 * Preparation includes -
 *      - Setting command ID and proper size
 *      - Setting background scan flush parameter
 *      - Ensuring correct endian-ness
 */
1817
int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
{
	struct host_cmd_ds_802_11_bg_scan_query *bg_query =
		&cmd->params.bg_scan_query;

	cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
	cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
				+ S_DS_GEN);

	bg_query->flush = 1;

	return 0;
}

/*
 * This function inserts scan command node to the scan pending queue.
 */
void
mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
		       struct cmd_ctrl_node *cmd_node)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	unsigned long flags;

1841
	cmd_node->wait_q_enabled = true;
1842
	cmd_node->condition = &adapter->scan_wait_q_woken;
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
	spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
	list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
	spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
}

/*
 * This function sends a scan command for all available channels to the
 * firmware, filtered on a specific SSID.
 */
static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1853
				      struct cfg80211_ssid *req_ssid)
1854
1855
1856
1857
1858
1859
1860
1861
{
	struct mwifiex_adapter *adapter = priv->adapter;
	int ret = 0;
	struct mwifiex_user_scan_cfg *scan_cfg;

	if (!req_ssid)
		return -1;

1862
	if (adapter->scan_processing) {
1863
1864
1865
1866
		dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
		return ret;
	}

1867
	if (priv->scan_block) {
1868
1869
1870
1871
1872
1873
1874
1875
		dev_dbg(adapter->dev,
			"cmd: Scan is blocked during association...\n");
		return ret;
	}

	scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
	if (!scan_cfg) {
		dev_err(adapter->dev, "failed to alloc scan_cfg\n");
1876
		return -ENOMEM;
1877
1878
	}

1879
1880
	scan_cfg->ssid_list = req_ssid;
	scan_cfg->num_ssids = 1;