scan.c 60.4 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

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#define MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD	4
#define MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD	15
#define MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD	27
#define MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD	35
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/* 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) +
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			  RSN_GTK_OUI_OFFSET);
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		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;

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	if (((bss_desc->bcn_wpa_ie) &&
	     ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id ==
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	      WLAN_EID_VENDOR_SPECIFIC))) {
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		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
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mwifiex_is_bss_wapi(struct mwifiex_private *priv,
		    struct mwifiex_bssdescriptor *bss_desc)
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{
	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
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mwifiex_is_bss_no_sec(struct mwifiex_private *priv,
		      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) ||
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		((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id !=
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		 WLAN_EID_VENDOR_SPECIFIC)) &&
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	    ((!bss_desc->bcn_rsn_ie) ||
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		((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id !=
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		 WLAN_EID_RSN)) &&
	    !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
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mwifiex_is_bss_static_wep(struct mwifiex_private *priv,
			  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->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
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mwifiex_is_bss_wpa(struct mwifiex_private *priv,
		   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) &&
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	    ((*(bss_desc->bcn_wpa_ie)).
	     vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC))
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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
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mwifiex_is_bss_wpa2(struct mwifiex_private *priv,
		    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))) {
		/*
		 * 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
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mwifiex_is_bss_adhoc_aes(struct mwifiex_private *priv,
			 struct mwifiex_bssdescriptor *bss_desc)
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{
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	if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
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	    !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_VENDOR_SPECIFIC)) &&
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	    ((!bss_desc->bcn_rsn_ie) ||
	     ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
	    !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
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mwifiex_is_bss_dynamic_wep(struct mwifiex_private *priv,
			   struct mwifiex_bssdescriptor *bss_desc)
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{
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	if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
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	    !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_VENDOR_SPECIFIC)) &&
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	    ((!bss_desc->bcn_rsn_ie) ||
	     ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
	    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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	}

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	if (mwifiex_is_bss_wapi(priv, bss_desc)) {
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		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) {
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		if (mwifiex_is_bss_no_sec(priv, bss_desc)) {
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			/* No security */
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			return 0;
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		} else if (mwifiex_is_bss_static_wep(priv, bss_desc)) {
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			/* 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;
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		} else if (mwifiex_is_bss_wpa(priv, bss_desc)) {
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			/* WPA enabled */
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			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)) {
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					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_bss_wpa2(priv, bss_desc)) {
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			/* WPA2 enabled */
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			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)) {
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					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_bss_adhoc_aes(priv, bss_desc)) {
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			/* Ad-hoc AES enabled */
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			return 0;
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		} else if (mwifiex_is_bss_dynamic_wep(priv, 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: wpa_ie=%#x wpa2_ie=%#x WEP=%s "
			"WPA=%s WPA2=%s EncMode=%#x privacy=%#x\n", __func__,
			(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.wep_enabled) ? "e" : "d",
			(priv->sec_info.wpa_enabled) ? "e" : "d",
			(priv->sec_info.wpa2_enabled) ? "e" : "d",
			priv->sec_info.encryption_mode, bss_desc->privacy);
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		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.
 */
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static int
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mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
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				 const struct mwifiex_user_scan_cfg
							*user_scan_in,
				 struct mwifiex_chan_scan_param_set
							*scan_chan_list,
				 u8 filtered_scan)
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{
	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 &&
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			    user_scan_in->chan_list[0].scan_time)
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				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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		}

	}
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	return 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
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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)
		 */
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		while (tlv_idx < max_chan_per_scan &&
		       tmp_chan_list->chan_number && !done_early) {
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			dev_dbg(priv->adapter->dev,
				"info: Scan: Chan(%3d), Radio(%d),"
				" Mode(%d, %d), Dur(%d)\n",
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				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));
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			/* 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 */
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			le16_add_cpu(&chan_tlv_out->header.len,
				     sizeof(chan_tlv_out->chan_scan_param));
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			/*
			 * 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. */
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			if (!filtered_scan &&
			    (tmp_chan_list->chan_number == 1 ||
			     tmp_chan_list->chan_number == 6 ||
			     tmp_chan_list->chan_number == 11))
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				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 */
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			if (!filtered_scan &&
			    (tmp_chan_list->chan_number == 1 ||
			     tmp_chan_list->chan_number == 6 ||
			     tmp_chan_list->chan_number == 11))
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				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
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mwifiex_config_scan(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)
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{
	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;
	u8 *tlv_pos;
	u32 num_probes;
	u32 ssid_len;
	u32 chan_idx;
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	u32 chan_num;
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	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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		    !is_zero_ether_addr(scan_cfg_out->specific_bssid))
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			*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
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		*max_chan_per_scan = MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD;
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	/* 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",
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			num_probes);
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		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);

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	if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info) &&
	    (priv->adapter->config_bands & BAND_GN ||
	     priv->adapter->config_bands & BAND_AN)) {
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		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;
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		     chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX &&
		     user_scan_in->chan_list[chan_idx].chan_number;
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		     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;

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			if (*filtered_scan)
				(scan_chan_list +
				 chan_idx)->chan_scan_mode_bitmap
					|= MWIFIEX_DISABLE_CHAN_FILT;

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			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 */
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		if ((chan_idx == 1) &&
		    (user_scan_in->chan_list[0].chan_number ==
		     priv->curr_bss_params.bss_descriptor.channel)) {
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			*scan_current_only = true;
			dev_dbg(adapter->dev,
				"info: Scan: Scanning current channel only\n");
		}
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		chan_num = chan_idx;
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	} else {
		dev_dbg(adapter->dev,
978
			"info: Scan: Creating full region channel list\n");
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		chan_num = mwifiex_scan_create_channel_list(priv, user_scan_in,
							    scan_chan_list,
							    *filtered_scan);
	}

	/*
	 * In associated state we will reduce the number of channels scanned per
	 * scan command to avoid any traffic delay/loss. This number is decided
	 * based on total number of channels to be scanned due to constraints
	 * of command buffers.
	 */
	if (priv->media_connected) {
		if (chan_num < MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD)
			*max_chan_per_scan = 1;
		else if (chan_num < MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD)
			*max_chan_per_scan = 2;
		else if (chan_num < MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD)
			*max_chan_per_scan = 3;
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		else
			*max_chan_per_scan = 4;
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	}
}

/*
 * 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",
1027
		tlv_buf_size);
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	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);
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				*tlv_data = current_tlv;
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				break;
			case TLV_TYPE_CHANNELBANDLIST:
				dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
					" band list TLV, len = %d\n", tlv_len);
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				*tlv_data = current_tlv;
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				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 */
}

/*
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 * This function parses provided beacon buffer and updates
 * respective fields in bss descriptor structure.
1075
 */
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int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
				    struct mwifiex_bssdescriptor *bss_entry)
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{
	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;
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	u32 bytes_left;
1093 1094 1095 1096 1097 1098
	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;
1099 1100
	current_ptr = bss_entry->beacon_buf;
	bytes_left = bss_entry->beacon_buf_size;
1101 1102

	/* Process variable IE */
1103
	while (bytes_left >= 2) {
1104 1105 1106 1107
		element_id = *current_ptr;
		element_len = *(current_ptr + 1);
		total_ie_len = element_len + sizeof(struct ieee_types_header);

1108
		if (bytes_left < total_ie_len) {
1109 1110
			dev_err(adapter->dev, "err: InterpretIE: in processing"
				" IE, bytes left < IE length\n");
1111
			return -1;
1112 1113 1114 1115 1116 1117
		}
		switch (element_id) {
		case WLAN_EID_SSID:
			bss_entry->ssid.ssid_len = element_len;
			memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
			       element_len);
1118 1119 1120
			dev_dbg(adapter->dev,
				"info: InterpretIE: ssid: %-32s\n",
				bss_entry->ssid.ssid);
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207
			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;
1208 1209
				bss_entry->wpa_offset = (u16)
					(current_ptr - bss_entry->beacon_buf);
1210 1211 1212
			} else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
				    sizeof(wmm_oui))) {
				if (total_ie_len ==
1213 1214
				    sizeof(struct ieee_types_wmm_parameter) ||
				    total_ie_len ==
1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
				    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;
1245 1246 1247
		case WLAN_EID_HT_OPERATION:
			bss_entry->bcn_ht_oper =
				(struct ieee80211_ht_operation *)(current_ptr +
1248 1249 1250 1251 1252 1253
					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:
1254 1255
			bss_entry->bcn_bss_co_2040 = current_ptr +
				sizeof(struct ieee_types_header);
1256 1257 1258 1259 1260
			bss_entry->bss_co_2040_offset = (u16) (current_ptr +
					sizeof(struct ieee_types_header) -
						bss_entry->beacon_buf);
			break;
		case WLAN_EID_EXT_CAPABILITY:
1261 1262
			bss_entry->bcn_ext_cap = current_ptr +
				sizeof(struct ieee_types_header);
1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273
			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 */
1274
		bytes_left -= (element_len + 2);
1275

1276
	}	/* while (bytes_left > 2) */
1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288
	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:
1289
		return BAND_A;
1290 1291
	case HostCmd_SCAN_RADIO_TYPE_BG:
	default:
1292
		return BAND_G;
1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
	}
}

/*
 * 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.
 */
1304 1305
int mwifiex_scan_networks(struct mwifiex_private *priv,
			  const struct mwifiex_user_scan_cfg *user_scan_in)
1306
{
1307
	int ret;
1308
	struct mwifiex_adapter *adapter = priv->adapter;
1309 1310
	struct cmd_ctrl_node *cmd_node;
	union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1311 1312 1313 1314 1315 1316 1317 1318
	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;

1319
	if (adapter->scan_processing) {
1320 1321
		dev_err(adapter->dev, "cmd: Scan already in process...\n");
		return -EBUSY;
1322 1323
	}

1324
	if (priv->scan_block) {
1325
		dev_err(adapter->dev,
1326
			"cmd: Scan is blocked during association...\n");
1327
		return -EBUSY;
1328 1329
	}

1330 1331 1332 1333
	spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
	adapter->scan_processing = true;
	spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);

1334
	scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1335
								GFP_KERNEL);
1336 1337
	if (!scan_cfg_out) {
		dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1338 1339
		ret = -ENOMEM;
		goto done;
1340 1341 1342
	}

	buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
1343
						MWIFIEX_USER_SCAN_CHAN_MAX;
1344 1345 1346 1347
	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);
1348 1349
		ret = -ENOMEM;
		goto done;
1350 1351
	}

1352 1353 1354
	mwifiex_config_scan(priv, user_scan_in, &scan_cfg_out->config,
			    &chan_list_out, scan_chan_list, &max_chan_per_scan,
			    &filtered_scan, &scan_current_chan_only);
1355