// SPDX-License-Identifier: GPL-2.0

  /*
   * 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_RTNL();

  	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;

  		if (wdev->wext.default_key != -1)
  			wdev->wext.connect.privacy = true;

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

  	if (wdev->wext.keys && wdev->wext.keys->def != -1) {

  		ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
  		if (!ck)
  			return -ENOMEM;

  		for (i = 0; i < CFG80211_MAX_WEP_KEYS; 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_sensitive(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_rdev(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(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;
  	}

  	wdev_lock(wdev);

  	if (wdev->conn) {

  		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;

  	err = cfg80211_mgd_wext_connect(rdev, wdev);

   out:
  	wdev_unlock(wdev);

  	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_rdev(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--;

  	wdev_lock(wdev);
  
  	err = 0;

  	if (wdev->conn) {

  		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);

  	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;

  	int ret = 0;

  
  	/* 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;
  
  		rcu_read_lock();
  		ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
  					  WLAN_EID_SSID);

  		if (ie) {
  			data->flags = 1;
  			data->length = ie[1];

  			if (data->length > IW_ESSID_MAX_SIZE)
  				ret = -EINVAL;
  			else
  				memcpy(ssid, ie + 2, data->length);

  		}

  		rcu_read_unlock();

  	} 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 ret;

  }

  
  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_rdev(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;

  	wdev_lock(wdev);

  	if (wdev->conn) {

  		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);

  	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

  		eth_zero_addr(ap_addr->sa_data);

  	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_rdev(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->conn) {

  		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_rdev(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;

  }