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

#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;
	u32 ssid_idx;
	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));

		for (ssid_idx = 0;
		     ((ssid_idx < ARRAY_SIZE(user_scan_in->ssid_list))
		      && (*user_scan_in->ssid_list[ssid_idx].ssid
			  || user_scan_in->ssid_list[ssid_idx].max_len));
		     ssid_idx++) {

			ssid_len = strlen(user_scan_in->ssid_list[ssid_idx].
					  ssid) + 1;

			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 */
			wildcard_ssid_tlv->max_ssid_length = 0;
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			memcpy(wildcard_ssid_tlv->ssid,
			       user_scan_in->ssid_list[ssid_idx].ssid,
			       ssid_len);

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

			dev_dbg(adapter->dev, "info: scan: ssid_list[%d]: %s, %d\n",
				ssid_idx, wildcard_ssid_tlv->ssid,
				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.
		 */
		if ((ssid_idx && ssid_filter)
		    || 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));
900 901 902
		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 */
}

/*
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 * 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)
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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;
1075
	u32 bytes_left;
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	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;
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	current_ptr = ie_buf;
	bytes_left = ie_len;
	bss_entry->beacon_buf = ie_buf;
	bss_entry->beacon_buf_size = ie_len;
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	/* Process variable IE */
1088
	while (bytes_left >= 2) {
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		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 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 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 1208 1209 1210 1211 1212 1213 1214 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 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 1531 1532 1533 1534 1535 1536 1537 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 1609 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</