net/wireless/wext-sme.c - linux - Git at Google

 /*
  * cfg80211 wext compat for managed mode.
  *
  * Copyright 2009	Johannes Berg <johannes@sipsolutions.net>
  * Copyright (C) 2009   Intel Corporation. All rights reserved.
  */

 #include <linux/export.h>
 #include <linux/etherdevice.h>
 #include <linux/if_arp.h>
 #include <linux/slab.h>
 #include <net/cfg80211.h>
 #include <net/cfg80211-wext.h>
 #include "wext-compat.h"
 #include "nl80211.h"

 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
 			      struct wireless_dev *wdev)
 {
 	struct cfg80211_cached_keys *ck = NULL;
 	const u8 *prev_bssid = NULL;
 	int err, i;

 	ASSERT_RDEV_LOCK(rdev);
 	ASSERT_WDEV_LOCK(wdev);

 	if (!netif_running(wdev->netdev))
 		return 0;

 	wdev->wext.connect.ie = wdev->wext.ie;
 	wdev->wext.connect.ie_len = wdev->wext.ie_len;

 	/* Use default background scan period */
 	wdev->wext.connect.bg_scan_period = -1;

 	if (wdev->wext.keys) {
 		wdev->wext.keys->def = wdev->wext.default_key;
 		wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
 		if (wdev->wext.default_key != -1)
 			wdev->wext.connect.privacy = true;
 	}

 	if (!wdev->wext.connect.ssid_len)
 		return 0;

 	if (wdev->wext.keys) {
 		ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 		if (!ck)
 			return -ENOMEM;
 		for (i = 0; i < 6; i++)
 			ck->params[i].key = ck->data[i];
 	}

 	if (wdev->wext.prev_bssid_valid)
 		prev_bssid = wdev->wext.prev_bssid;

 	err = __cfg80211_connect(rdev, wdev->netdev,
 				 &wdev->wext.connect, ck, prev_bssid);
 	if (err)
 		kfree(ck);

 	return err;
 }

 int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
 			      struct iw_request_info *info,
 			      struct iw_freq *wextfreq, char *extra)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 	struct ieee80211_channel *chan = NULL;
 	int err, freq;

 	/* call only for station! */
 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 		return -EINVAL;

 	freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
 	if (freq < 0)
 		return freq;

 	if (freq) {
 		chan = ieee80211_get_channel(wdev->wiphy, freq);
 		if (!chan)
 			return -EINVAL;
 		if (chan->flags & IEEE80211_CHAN_DISABLED)
 			return -EINVAL;
 	}

 	cfg80211_lock_rdev(rdev);
 	mutex_lock(&rdev->devlist_mtx);
 	wdev_lock(wdev);

 	if (wdev->sme_state != CFG80211_SME_IDLE) {
 		bool event = true;

 		if (wdev->wext.connect.channel == chan) {
 			err = 0;
 			goto out;
 		}

 		/* if SSID set, we'll try right again, avoid event */
 		if (wdev->wext.connect.ssid_len)
 			event = false;
 		err = __cfg80211_disconnect(rdev, dev,
 					    WLAN_REASON_DEAUTH_LEAVING, event);
 		if (err)
 			goto out;
 	}


 	wdev->wext.connect.channel = chan;

 	/*
 	 * SSID is not set, we just want to switch monitor channel,
 	 * this is really just backward compatibility, if the SSID
 	 * is set then we use the channel to select the BSS to use
 	 * to connect to instead. If we were connected on another
 	 * channel we disconnected above and reconnect below.
 	 */
 	if (chan && !wdev->wext.connect.ssid_len) {
 		struct cfg80211_chan_def chandef = {
 			._type = NL80211_CHAN_NO_HT,
 		};

 		chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
 		if (chandef.chan)
 			err = cfg80211_set_monitor_channel(rdev, &chandef);
 		else
 			err = -EINVAL;
 		goto out;
 	}

 	err = cfg80211_mgd_wext_connect(rdev, wdev);
  out:
 	wdev_unlock(wdev);
 	mutex_unlock(&rdev->devlist_mtx);
 	cfg80211_unlock_rdev(rdev);
 	return err;
 }

 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 			      struct iw_request_info *info,
 			      struct iw_freq *freq, char *extra)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct ieee80211_channel *chan = NULL;

 	/* call only for station! */
 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 		return -EINVAL;

 	wdev_lock(wdev);
 	if (wdev->current_bss)
 		chan = wdev->current_bss->pub.channel;
 	else if (wdev->wext.connect.channel)
 		chan = wdev->wext.connect.channel;
 	wdev_unlock(wdev);

 	if (chan) {
 		freq->m = chan->center_freq;
 		freq->e = 6;
 		return 0;
 	}

 	/* no channel if not joining */
 	return -EINVAL;
 }

 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 			       struct iw_request_info *info,
 			       struct iw_point *data, char *ssid)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 	size_t len = data->length;
 	int err;

 	/* call only for station! */
 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 		return -EINVAL;

 	if (!data->flags)
 		len = 0;

 	/* iwconfig uses nul termination in SSID.. */
 	if (len > 0 && ssid[len - 1] == '\0')
 		len--;

 	cfg80211_lock_rdev(rdev);
 	mutex_lock(&rdev->devlist_mtx);
 	wdev_lock(wdev);

 	err = 0;

 	if (wdev->sme_state != CFG80211_SME_IDLE) {
 		bool event = true;

 		if (wdev->wext.connect.ssid && len &&
 		    len == wdev->wext.connect.ssid_len &&
 		    memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 			goto out;

 		/* if SSID set now, we'll try to connect, avoid event */
 		if (len)
 			event = false;
 		err = __cfg80211_disconnect(rdev, dev,
 					    WLAN_REASON_DEAUTH_LEAVING, event);
 		if (err)
 			goto out;
 	}

 	wdev->wext.prev_bssid_valid = false;
 	wdev->wext.connect.ssid = wdev->wext.ssid;
 	memcpy(wdev->wext.ssid, ssid, len);
 	wdev->wext.connect.ssid_len = len;

 	wdev->wext.connect.crypto.control_port = false;
 	wdev->wext.connect.crypto.control_port_ethertype =
 					cpu_to_be16(ETH_P_PAE);

 	err = cfg80211_mgd_wext_connect(rdev, wdev);
  out:
 	wdev_unlock(wdev);
 	mutex_unlock(&rdev->devlist_mtx);
 	cfg80211_unlock_rdev(rdev);
 	return err;
 }

 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 			       struct iw_request_info *info,
 			       struct iw_point *data, char *ssid)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;

 	/* call only for station! */
 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 		return -EINVAL;

 	data->flags = 0;

 	wdev_lock(wdev);
 	if (wdev->current_bss) {
 		const u8 *ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
 						    WLAN_EID_SSID);
 		if (ie) {
 			data->flags = 1;
 			data->length = ie[1];
 			memcpy(ssid, ie + 2, data->length);
 		}
 	} else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 		data->flags = 1;
 		data->length = wdev->wext.connect.ssid_len;
 		memcpy(ssid, wdev->wext.connect.ssid, data->length);
 	}
 	wdev_unlock(wdev);

 	return 0;
 }

 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 			    struct iw_request_info *info,
 			    struct sockaddr *ap_addr, char *extra)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 	u8 *bssid = ap_addr->sa_data;
 	int err;

 	/* call only for station! */
 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 		return -EINVAL;

 	if (ap_addr->sa_family != ARPHRD_ETHER)
 		return -EINVAL;

 	/* automatic mode */
 	if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 		bssid = NULL;

 	cfg80211_lock_rdev(rdev);
 	mutex_lock(&rdev->devlist_mtx);
 	wdev_lock(wdev);

 	if (wdev->sme_state != CFG80211_SME_IDLE) {
 		err = 0;
 		/* both automatic */
 		if (!bssid && !wdev->wext.connect.bssid)
 			goto out;

 		/* fixed already - and no change */
 		if (wdev->wext.connect.bssid && bssid &&
 		    ether_addr_equal(bssid, wdev->wext.connect.bssid))
 			goto out;

 		err = __cfg80211_disconnect(rdev, dev,
 					    WLAN_REASON_DEAUTH_LEAVING, false);
 		if (err)
 			goto out;
 	}

 	if (bssid) {
 		memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 		wdev->wext.connect.bssid = wdev->wext.bssid;
 	} else
 		wdev->wext.connect.bssid = NULL;

 	err = cfg80211_mgd_wext_connect(rdev, wdev);
  out:
 	wdev_unlock(wdev);
 	mutex_unlock(&rdev->devlist_mtx);
 	cfg80211_unlock_rdev(rdev);
 	return err;
 }

 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 			    struct iw_request_info *info,
 			    struct sockaddr *ap_addr, char *extra)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;

 	/* call only for station! */
 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 		return -EINVAL;

 	ap_addr->sa_family = ARPHRD_ETHER;

 	wdev_lock(wdev);
 	if (wdev->current_bss)
 		memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 	else
 		memset(ap_addr->sa_data, 0, ETH_ALEN);
 	wdev_unlock(wdev);

 	return 0;
 }

 int cfg80211_wext_siwgenie(struct net_device *dev,
 			   struct iw_request_info *info,
 			   struct iw_point *data, char *extra)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 	u8 *ie = extra;
 	int ie_len = data->length, err;

 	if (wdev->iftype != NL80211_IFTYPE_STATION)
 		return -EOPNOTSUPP;

 	if (!ie_len)
 		ie = NULL;

 	wdev_lock(wdev);

 	/* no change */
 	err = 0;
 	if (wdev->wext.ie_len == ie_len &&
 	    memcmp(wdev->wext.ie, ie, ie_len) == 0)
 		goto out;

 	if (ie_len) {
 		ie = kmemdup(extra, ie_len, GFP_KERNEL);
 		if (!ie) {
 			err = -ENOMEM;
 			goto out;
 		}
 	} else
 		ie = NULL;

 	kfree(wdev->wext.ie);
 	wdev->wext.ie = ie;
 	wdev->wext.ie_len = ie_len;

 	if (wdev->sme_state != CFG80211_SME_IDLE) {
 		err = __cfg80211_disconnect(rdev, dev,
 					    WLAN_REASON_DEAUTH_LEAVING, false);
 		if (err)
 			goto out;
 	}

 	/* userspace better not think we'll reconnect */
 	err = 0;
  out:
 	wdev_unlock(wdev);
 	return err;
 }

 int cfg80211_wext_siwmlme(struct net_device *dev,
 			  struct iw_request_info *info,
 			  struct iw_point *data, char *extra)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct iw_mlme *mlme = (struct iw_mlme *)extra;
 	struct cfg80211_registered_device *rdev;
 	int err;

 	if (!wdev)
 		return -EOPNOTSUPP;

 	rdev = wiphy_to_dev(wdev->wiphy);

 	if (wdev->iftype != NL80211_IFTYPE_STATION)
 		return -EINVAL;

 	if (mlme->addr.sa_family != ARPHRD_ETHER)
 		return -EINVAL;

 	wdev_lock(wdev);
 	switch (mlme->cmd) {
 	case IW_MLME_DEAUTH:
 	case IW_MLME_DISASSOC:
 		err = __cfg80211_disconnect(rdev, dev, mlme->reason_code,
 					    true);
 		break;
 	default:
 		err = -EOPNOTSUPP;
 		break;
 	}
 	wdev_unlock(wdev);

 	return err;
 }
	/*
	* cfg80211 wext compat for managed mode.
	*
	* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
	* Copyright (C) 2009 Intel Corporation. All rights reserved.
	*/

	#include <linux/export.h>
	#include <linux/etherdevice.h>
	#include <linux/if_arp.h>
	#include <linux/slab.h>
	#include <net/cfg80211.h>
	#include <net/cfg80211-wext.h>
	#include "wext-compat.h"
	#include "nl80211.h"

	int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
	struct wireless_dev *wdev)
	{
	struct cfg80211_cached_keys *ck = NULL;
	const u8 *prev_bssid = NULL;
	int err, i;

	ASSERT_RDEV_LOCK(rdev);
	ASSERT_WDEV_LOCK(wdev);

	if (!netif_running(wdev->netdev))
	return 0;

	wdev->wext.connect.ie = wdev->wext.ie;
	wdev->wext.connect.ie_len = wdev->wext.ie_len;

	/* Use default background scan period */
	wdev->wext.connect.bg_scan_period = -1;

	if (wdev->wext.keys) {
	wdev->wext.keys->def = wdev->wext.default_key;
	wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
	if (wdev->wext.default_key != -1)
	wdev->wext.connect.privacy = true;
	}

	if (!wdev->wext.connect.ssid_len)
	return 0;

	if (wdev->wext.keys) {
	ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
	if (!ck)
	return -ENOMEM;
	for (i = 0; i < 6; i++)
	ck->params[i].key = ck->data[i];
	}

	if (wdev->wext.prev_bssid_valid)
	prev_bssid = wdev->wext.prev_bssid;

	err = __cfg80211_connect(rdev, wdev->netdev,
	&wdev->wext.connect, ck, prev_bssid);
	if (err)
	kfree(ck);

	return err;
	}

	int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
	struct iw_request_info *info,
	struct iw_freq wextfreq, char extra)
	{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
	struct ieee80211_channel *chan = NULL;
	int err, freq;

	/* call only for station! */
	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
	return -EINVAL;

	freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
	if (freq < 0)
	return freq;

	if (freq) {
	chan = ieee80211_get_channel(wdev->wiphy, freq);
	if (!chan)
	return -EINVAL;
	if (chan->flags & IEEE80211_CHAN_DISABLED)
	return -EINVAL;
	}

	cfg80211_lock_rdev(rdev);
	mutex_lock(&rdev->devlist_mtx);
	wdev_lock(wdev);

	if (wdev->sme_state != CFG80211_SME_IDLE) {
	bool event = true;

	if (wdev->wext.connect.channel == chan) {
	err = 0;
	goto out;
	}

	/* if SSID set, we'll try right again, avoid event */
	if (wdev->wext.connect.ssid_len)
	event = false;
	err = __cfg80211_disconnect(rdev, dev,
	WLAN_REASON_DEAUTH_LEAVING, event);
	if (err)
	goto out;
	}


	wdev->wext.connect.channel = chan;

	/*
	* SSID is not set, we just want to switch monitor channel,
	* this is really just backward compatibility, if the SSID
	* is set then we use the channel to select the BSS to use
	* to connect to instead. If we were connected on another
	* channel we disconnected above and reconnect below.
	*/
	if (chan && !wdev->wext.connect.ssid_len) {
	struct cfg80211_chan_def chandef = {
	._type = NL80211_CHAN_NO_HT,
	};

	chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
	if (chandef.chan)
	err = cfg80211_set_monitor_channel(rdev, &chandef);
	else
	err = -EINVAL;
	goto out;
	}

	err = cfg80211_mgd_wext_connect(rdev, wdev);
	out:
	wdev_unlock(wdev);
	mutex_unlock(&rdev->devlist_mtx);
	cfg80211_unlock_rdev(rdev);
	return err;
	}

	int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
	struct iw_request_info *info,
	struct iw_freq freq, char extra)
	{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct ieee80211_channel *chan = NULL;

	/* call only for station! */
	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
	return -EINVAL;

	wdev_lock(wdev);
	if (wdev->current_bss)
	chan = wdev->current_bss->pub.channel;
	else if (wdev->wext.connect.channel)
	chan = wdev->wext.connect.channel;
	wdev_unlock(wdev);

	if (chan) {
	freq->m = chan->center_freq;
	freq->e = 6;
	return 0;
	}

	/* no channel if not joining */
	return -EINVAL;
	}

	int cfg80211_mgd_wext_siwessid(struct net_device *dev,
	struct iw_request_info *info,
	struct iw_point data, char ssid)
	{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
	size_t len = data->length;
	int err;

	/* call only for station! */
	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
	return -EINVAL;

	if (!data->flags)
	len = 0;

	/* iwconfig uses nul termination in SSID.. */
	if (len > 0 && ssid[len - 1] == '\0')
	len--;

	cfg80211_lock_rdev(rdev);
	mutex_lock(&rdev->devlist_mtx);
	wdev_lock(wdev);

	err = 0;

	if (wdev->sme_state != CFG80211_SME_IDLE) {
	bool event = true;

	if (wdev->wext.connect.ssid && len &&
	len == wdev->wext.connect.ssid_len &&
	memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
	goto out;

	/* if SSID set now, we'll try to connect, avoid event */
	if (len)
	event = false;
	err = __cfg80211_disconnect(rdev, dev,
	WLAN_REASON_DEAUTH_LEAVING, event);
	if (err)
	goto out;
	}

	wdev->wext.prev_bssid_valid = false;
	wdev->wext.connect.ssid = wdev->wext.ssid;
	memcpy(wdev->wext.ssid, ssid, len);
	wdev->wext.connect.ssid_len = len;

	wdev->wext.connect.crypto.control_port = false;
	wdev->wext.connect.crypto.control_port_ethertype =
	cpu_to_be16(ETH_P_PAE);

	err = cfg80211_mgd_wext_connect(rdev, wdev);
	out:
	wdev_unlock(wdev);
	mutex_unlock(&rdev->devlist_mtx);
	cfg80211_unlock_rdev(rdev);
	return err;
	}

	int cfg80211_mgd_wext_giwessid(struct net_device *dev,
	struct iw_request_info *info,
	struct iw_point data, char ssid)
	{
	struct wireless_dev *wdev = dev->ieee80211_ptr;

	/* call only for station! */
	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
	return -EINVAL;

	data->flags = 0;

	wdev_lock(wdev);
	if (wdev->current_bss) {
	const u8 *ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
	WLAN_EID_SSID);
	if (ie) {
	data->flags = 1;
	data->length = ie[1];
	memcpy(ssid, ie + 2, data->length);
	}
	} else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
	data->flags = 1;
	data->length = wdev->wext.connect.ssid_len;
	memcpy(ssid, wdev->wext.connect.ssid, data->length);
	}
	wdev_unlock(wdev);

	return 0;
	}

	int cfg80211_mgd_wext_siwap(struct net_device *dev,
	struct iw_request_info *info,
	struct sockaddr ap_addr, char extra)
	{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
	u8 *bssid = ap_addr->sa_data;
	int err;

	/* call only for station! */
	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
	return -EINVAL;

	if (ap_addr->sa_family != ARPHRD_ETHER)
	return -EINVAL;

	/* automatic mode */
	if (is_zero_ether_addr(bssid) \|\| is_broadcast_ether_addr(bssid))
	bssid = NULL;

	cfg80211_lock_rdev(rdev);
	mutex_lock(&rdev->devlist_mtx);
	wdev_lock(wdev);

	if (wdev->sme_state != CFG80211_SME_IDLE) {
	err = 0;
	/* both automatic */
	if (!bssid && !wdev->wext.connect.bssid)
	goto out;

	/* fixed already - and no change */
	if (wdev->wext.connect.bssid && bssid &&
	ether_addr_equal(bssid, wdev->wext.connect.bssid))
	goto out;

	err = __cfg80211_disconnect(rdev, dev,
	WLAN_REASON_DEAUTH_LEAVING, false);
	if (err)
	goto out;
	}

	if (bssid) {
	memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
	wdev->wext.connect.bssid = wdev->wext.bssid;
	} else
	wdev->wext.connect.bssid = NULL;

	err = cfg80211_mgd_wext_connect(rdev, wdev);
	out:
	wdev_unlock(wdev);
	mutex_unlock(&rdev->devlist_mtx);
	cfg80211_unlock_rdev(rdev);
	return err;
	}

	int cfg80211_mgd_wext_giwap(struct net_device *dev,
	struct iw_request_info *info,
	struct sockaddr ap_addr, char extra)
	{
	struct wireless_dev *wdev = dev->ieee80211_ptr;

	/* call only for station! */
	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
	return -EINVAL;

	ap_addr->sa_family = ARPHRD_ETHER;

	wdev_lock(wdev);
	if (wdev->current_bss)
	memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
	else
	memset(ap_addr->sa_data, 0, ETH_ALEN);
	wdev_unlock(wdev);

	return 0;
	}

	int cfg80211_wext_siwgenie(struct net_device *dev,
	struct iw_request_info *info,
	struct iw_point data, char extra)
	{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
	u8 *ie = extra;
	int ie_len = data->length, err;

	if (wdev->iftype != NL80211_IFTYPE_STATION)
	return -EOPNOTSUPP;

	if (!ie_len)
	ie = NULL;

	wdev_lock(wdev);

	/* no change */
	err = 0;
	if (wdev->wext.ie_len == ie_len &&
	memcmp(wdev->wext.ie, ie, ie_len) == 0)
	goto out;

	if (ie_len) {
	ie = kmemdup(extra, ie_len, GFP_KERNEL);
	if (!ie) {
	err = -ENOMEM;
	goto out;
	}
	} else
	ie = NULL;

	kfree(wdev->wext.ie);
	wdev->wext.ie = ie;
	wdev->wext.ie_len = ie_len;

	if (wdev->sme_state != CFG80211_SME_IDLE) {
	err = __cfg80211_disconnect(rdev, dev,
	WLAN_REASON_DEAUTH_LEAVING, false);
	if (err)
	goto out;
	}

	/* userspace better not think we'll reconnect */
	err = 0;
	out:
	wdev_unlock(wdev);
	return err;
	}

	int cfg80211_wext_siwmlme(struct net_device *dev,
	struct iw_request_info *info,
	struct iw_point data, char extra)
	{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct iw_mlme mlme = (struct iw_mlme )extra;
	struct cfg80211_registered_device *rdev;
	int err;

	if (!wdev)
	return -EOPNOTSUPP;

	rdev = wiphy_to_dev(wdev->wiphy);

	if (wdev->iftype != NL80211_IFTYPE_STATION)
	return -EINVAL;

	if (mlme->addr.sa_family != ARPHRD_ETHER)
	return -EINVAL;

	wdev_lock(wdev);
	switch (mlme->cmd) {
	case IW_MLME_DEAUTH:
	case IW_MLME_DISASSOC:
	err = __cfg80211_disconnect(rdev, dev, mlme->reason_code,
	true);
	break;
	default:
	err = -EOPNOTSUPP;
	break;
	}
	wdev_unlock(wdev);

	return err;
	}