net/mac80211/ieee80211_iface.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright 2002-2005, Instant802 Networks, Inc.
  * Copyright 2005-2006, Devicescape Software, Inc.
  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 #include <linux/kernel.h>
 #include <linux/if_arp.h>
 #include <linux/netdevice.h>
 #include <linux/rtnetlink.h>
 #include <net/mac80211.h>
 #include "ieee80211_i.h"
 #include "sta_info.h"
 #include "debugfs_netdev.h"

 void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
 {
 	int i;

 	/* Default values for sub-interface parameters */
 	sdata->drop_unencrypted = 0;
 	sdata->eapol = 1;
 	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 		skb_queue_head_init(&sdata->fragments[i].skb_list);
 }

 static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
 {
 	int i;

 	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
 		__skb_queue_purge(&sdata->fragments[i].skb_list);
 	}
 }

 /* Must be called with rtnl lock held. */
 int ieee80211_if_add(struct net_device *dev, const char *name,
 		     struct net_device **new_dev, int type)
 {
 	struct net_device *ndev;
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 	struct ieee80211_sub_if_data *sdata = NULL;
 	int ret;

 	ASSERT_RTNL();
 	ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
 			    name, ieee80211_if_setup);
 	if (!ndev)
 		return -ENOMEM;

 	ret = dev_alloc_name(ndev, ndev->name);
 	if (ret < 0)
 		goto fail;

 	memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 	ndev->base_addr = dev->base_addr;
 	ndev->irq = dev->irq;
 	ndev->mem_start = dev->mem_start;
 	ndev->mem_end = dev->mem_end;
 	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));

 	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 	ndev->ieee80211_ptr = &sdata->wdev;
 	sdata->wdev.wiphy = local->hw.wiphy;
 	sdata->type = IEEE80211_IF_TYPE_AP;
 	sdata->dev = ndev;
 	sdata->local = local;
 	ieee80211_if_sdata_init(sdata);

 	ret = register_netdevice(ndev);
 	if (ret)
 		goto fail;

 	ieee80211_debugfs_add_netdev(sdata);
 	ieee80211_if_set_type(ndev, type);

 	write_lock_bh(&local->sub_if_lock);
 	if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
 		write_unlock_bh(&local->sub_if_lock);
 		__ieee80211_if_del(local, sdata);
 		return -ENODEV;
 	}
 	list_add(&sdata->list, &local->sub_if_list);
 	if (new_dev)
 		*new_dev = ndev;
 	write_unlock_bh(&local->sub_if_lock);

 	ieee80211_update_default_wep_only(local);

 	return 0;

 fail:
 	free_netdev(ndev);
 	return ret;
 }

 int ieee80211_if_add_mgmt(struct ieee80211_local *local)
 {
 	struct net_device *ndev;
 	struct ieee80211_sub_if_data *nsdata;
 	int ret;

 	ASSERT_RTNL();

 	ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), "wmgmt%d",
 			    ieee80211_if_mgmt_setup);
 	if (!ndev)
 		return -ENOMEM;
 	ret = dev_alloc_name(ndev, ndev->name);
 	if (ret < 0)
 		goto fail;

 	memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));

 	nsdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 	ndev->ieee80211_ptr = &nsdata->wdev;
 	nsdata->wdev.wiphy = local->hw.wiphy;
 	nsdata->type = IEEE80211_IF_TYPE_MGMT;
 	nsdata->dev = ndev;
 	nsdata->local = local;
 	ieee80211_if_sdata_init(nsdata);

 	ret = register_netdevice(ndev);
 	if (ret)
 		goto fail;

 	ieee80211_debugfs_add_netdev(nsdata);

 	if (local->open_count > 0)
 		dev_open(ndev);
 	local->apdev = ndev;
 	return 0;

 fail:
 	free_netdev(ndev);
 	return ret;
 }

 void ieee80211_if_del_mgmt(struct ieee80211_local *local)
 {
 	struct net_device *apdev;

 	ASSERT_RTNL();
 	apdev = local->apdev;
 	ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(apdev));
 	local->apdev = NULL;
 	unregister_netdevice(apdev);
 }

 void ieee80211_if_set_type(struct net_device *dev, int type)
 {
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 	int oldtype = sdata->type;

 	dev->hard_start_xmit = ieee80211_subif_start_xmit;

 	sdata->type = type;
 	switch (type) {
 	case IEEE80211_IF_TYPE_WDS:
 		sdata->bss = NULL;
 		break;
 	case IEEE80211_IF_TYPE_VLAN:
 		break;
 	case IEEE80211_IF_TYPE_AP:
 		sdata->u.ap.dtim_period = 2;
 		sdata->u.ap.force_unicast_rateidx = -1;
 		sdata->u.ap.max_ratectrl_rateidx = -1;
 		skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 		sdata->bss = &sdata->u.ap;
 		break;
 	case IEEE80211_IF_TYPE_STA:
 	case IEEE80211_IF_TYPE_IBSS: {
 		struct ieee80211_sub_if_data *msdata;
 		struct ieee80211_if_sta *ifsta;

 		ifsta = &sdata->u.sta;
 		INIT_WORK(&ifsta->work, ieee80211_sta_work);
 		setup_timer(&ifsta->timer, ieee80211_sta_timer,
 			    (unsigned long) sdata);
 		skb_queue_head_init(&ifsta->skb_queue);

 		ifsta->capab = WLAN_CAPABILITY_ESS;
 		ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 			IEEE80211_AUTH_ALG_SHARED_KEY;
 		ifsta->create_ibss = 1;
 		ifsta->wmm_enabled = 1;
 		ifsta->auto_channel_sel = 1;
 		ifsta->auto_bssid_sel = 1;

 		msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 		sdata->bss = &msdata->u.ap;
 		break;
 	}
 	case IEEE80211_IF_TYPE_MNTR:
 		dev->type = ARPHRD_IEEE80211_RADIOTAP;
 		dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 		break;
 	default:
 		printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 		       dev->name, __FUNCTION__, type);
 	}
 	ieee80211_debugfs_change_if_type(sdata, oldtype);
 	ieee80211_update_default_wep_only(local);
 }

 /* Must be called with rtnl lock held. */
 void ieee80211_if_reinit(struct net_device *dev)
 {
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	struct sta_info *sta;
 	int i;

 	ASSERT_RTNL();
 	ieee80211_if_sdata_deinit(sdata);
 	for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
 		if (!sdata->keys[i])
 			continue;
 #if 0
 		/* The interface is down at the moment, so there is not
 		 * really much point in disabling the keys at this point. */
 		memset(addr, 0xff, ETH_ALEN);
 		if (local->ops->set_key)
 			local->ops->set_key(local_to_hw(local), DISABLE_KEY, addr,
 					    local->keys[i], 0);
 #endif
 		ieee80211_key_free(sdata->keys[i]);
 		sdata->keys[i] = NULL;
 	}

 	switch (sdata->type) {
 	case IEEE80211_IF_TYPE_AP: {
 		/* Remove all virtual interfaces that use this BSS
 		 * as their sdata->bss */
 		struct ieee80211_sub_if_data *tsdata, *n;
 		LIST_HEAD(tmp_list);

 		write_lock_bh(&local->sub_if_lock);
 		list_for_each_entry_safe(tsdata, n, &local->sub_if_list, list) {
 			if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 				printk(KERN_DEBUG "%s: removing virtual "
 				       "interface %s because its BSS interface"
 				       " is being removed\n",
 				       sdata->dev->name, tsdata->dev->name);
 				list_move_tail(&tsdata->list, &tmp_list);
 			}
 		}
 		write_unlock_bh(&local->sub_if_lock);

 		list_for_each_entry_safe(tsdata, n, &tmp_list, list)
 			__ieee80211_if_del(local, tsdata);

 		kfree(sdata->u.ap.beacon_head);
 		kfree(sdata->u.ap.beacon_tail);
 		kfree(sdata->u.ap.generic_elem);

 		if (dev != local->mdev) {
 			struct sk_buff *skb;
 			while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 				local->total_ps_buffered--;
 				dev_kfree_skb(skb);
 			}
 		}

 		break;
 	}
 	case IEEE80211_IF_TYPE_WDS:
 		sta = sta_info_get(local, sdata->u.wds.remote_addr);
 		if (sta) {
 			sta_info_put(sta);
 			sta_info_free(sta, 0);
 		} else {
 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 			printk(KERN_DEBUG "%s: Someone had deleted my STA "
 			       "entry for the WDS link\n", dev->name);
 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 		}
 		break;
 	case IEEE80211_IF_TYPE_STA:
 	case IEEE80211_IF_TYPE_IBSS:
 		kfree(sdata->u.sta.extra_ie);
 		sdata->u.sta.extra_ie = NULL;
 		kfree(sdata->u.sta.assocreq_ies);
 		sdata->u.sta.assocreq_ies = NULL;
 		kfree(sdata->u.sta.assocresp_ies);
 		sdata->u.sta.assocresp_ies = NULL;
 		if (sdata->u.sta.probe_resp) {
 			dev_kfree_skb(sdata->u.sta.probe_resp);
 			sdata->u.sta.probe_resp = NULL;
 		}

 		break;
 	case IEEE80211_IF_TYPE_MNTR:
 		dev->type = ARPHRD_ETHER;
 		break;
 	}

 	/* remove all STAs that are bound to this virtual interface */
 	sta_info_flush(local, dev);

 	memset(&sdata->u, 0, sizeof(sdata->u));
 	ieee80211_if_sdata_init(sdata);
 }

 /* Must be called with rtnl lock held. */
 void __ieee80211_if_del(struct ieee80211_local *local,
 			struct ieee80211_sub_if_data *sdata)
 {
 	struct net_device *dev = sdata->dev;

 	ieee80211_debugfs_remove_netdev(sdata);
 	unregister_netdevice(dev);
 	/* Except master interface, the net_device will be freed by
 	 * net_device->destructor (i. e. ieee80211_if_free). */
 }

 /* Must be called with rtnl lock held. */
 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 {
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 	struct ieee80211_sub_if_data *sdata, *n;

 	ASSERT_RTNL();

 	write_lock_bh(&local->sub_if_lock);
 	list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
 		if ((sdata->type == id || id == -1) &&
 		    strcmp(name, sdata->dev->name) == 0 &&
 		    sdata->dev != local->mdev) {
 			list_del(&sdata->list);
 			write_unlock_bh(&local->sub_if_lock);
 			__ieee80211_if_del(local, sdata);
 			ieee80211_update_default_wep_only(local);
 			return 0;
 		}
 	}
 	write_unlock_bh(&local->sub_if_lock);
 	return -ENODEV;
 }

 void ieee80211_if_free(struct net_device *dev)
 {
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

 	/* local->apdev must be NULL when freeing management interface */
 	BUG_ON(dev == local->apdev);
 	ieee80211_if_sdata_deinit(sdata);
 	free_netdev(dev);
 }
	/*
	* Copyright 2002-2005, Instant802 Networks, Inc.
	* Copyright 2005-2006, Devicescape Software, Inc.
	* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/
	#include <linux/kernel.h>
	#include <linux/if_arp.h>
	#include <linux/netdevice.h>
	#include <linux/rtnetlink.h>
	#include <net/mac80211.h>
	#include "ieee80211_i.h"
	#include "sta_info.h"
	#include "debugfs_netdev.h"

	void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
	{
	int i;

	/* Default values for sub-interface parameters */
	sdata->drop_unencrypted = 0;
	sdata->eapol = 1;
	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
	skb_queue_head_init(&sdata->fragments[i].skb_list);
	}

	static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
	{
	int i;

	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
	__skb_queue_purge(&sdata->fragments[i].skb_list);
	}
	}

	/* Must be called with rtnl lock held. */
	int ieee80211_if_add(struct net_device dev, const char name,
	struct net_device **new_dev, int type)
	{
	struct net_device *ndev;
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = NULL;
	int ret;

	ASSERT_RTNL();
	ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
	name, ieee80211_if_setup);
	if (!ndev)
	return -ENOMEM;

	ret = dev_alloc_name(ndev, ndev->name);
	if (ret < 0)
	goto fail;

	memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
	ndev->base_addr = dev->base_addr;
	ndev->irq = dev->irq;
	ndev->mem_start = dev->mem_start;
	ndev->mem_end = dev->mem_end;
	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));

	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
	ndev->ieee80211_ptr = &sdata->wdev;
	sdata->wdev.wiphy = local->hw.wiphy;
	sdata->type = IEEE80211_IF_TYPE_AP;
	sdata->dev = ndev;
	sdata->local = local;
	ieee80211_if_sdata_init(sdata);

	ret = register_netdevice(ndev);
	if (ret)
	goto fail;

	ieee80211_debugfs_add_netdev(sdata);
	ieee80211_if_set_type(ndev, type);

	write_lock_bh(&local->sub_if_lock);
	if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
	write_unlock_bh(&local->sub_if_lock);
	__ieee80211_if_del(local, sdata);
	return -ENODEV;
	}
	list_add(&sdata->list, &local->sub_if_list);
	if (new_dev)
	*new_dev = ndev;
	write_unlock_bh(&local->sub_if_lock);

	ieee80211_update_default_wep_only(local);

	return 0;

	fail:
	free_netdev(ndev);
	return ret;
	}

	int ieee80211_if_add_mgmt(struct ieee80211_local *local)
	{
	struct net_device *ndev;
	struct ieee80211_sub_if_data *nsdata;
	int ret;

	ASSERT_RTNL();

	ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), "wmgmt%d",
	ieee80211_if_mgmt_setup);
	if (!ndev)
	return -ENOMEM;
	ret = dev_alloc_name(ndev, ndev->name);
	if (ret < 0)
	goto fail;

	memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));

	nsdata = IEEE80211_DEV_TO_SUB_IF(ndev);
	ndev->ieee80211_ptr = &nsdata->wdev;
	nsdata->wdev.wiphy = local->hw.wiphy;
	nsdata->type = IEEE80211_IF_TYPE_MGMT;
	nsdata->dev = ndev;
	nsdata->local = local;
	ieee80211_if_sdata_init(nsdata);

	ret = register_netdevice(ndev);
	if (ret)
	goto fail;

	ieee80211_debugfs_add_netdev(nsdata);

	if (local->open_count > 0)
	dev_open(ndev);
	local->apdev = ndev;
	return 0;

	fail:
	free_netdev(ndev);
	return ret;
	}

	void ieee80211_if_del_mgmt(struct ieee80211_local *local)
	{
	struct net_device *apdev;

	ASSERT_RTNL();
	apdev = local->apdev;
	ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(apdev));
	local->apdev = NULL;
	unregister_netdevice(apdev);
	}

	void ieee80211_if_set_type(struct net_device *dev, int type)
	{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	int oldtype = sdata->type;

	dev->hard_start_xmit = ieee80211_subif_start_xmit;

	sdata->type = type;
	switch (type) {
	case IEEE80211_IF_TYPE_WDS:
	sdata->bss = NULL;
	break;
	case IEEE80211_IF_TYPE_VLAN:
	break;
	case IEEE80211_IF_TYPE_AP:
	sdata->u.ap.dtim_period = 2;
	sdata->u.ap.force_unicast_rateidx = -1;
	sdata->u.ap.max_ratectrl_rateidx = -1;
	skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
	sdata->bss = &sdata->u.ap;
	break;
	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_IBSS: {
	struct ieee80211_sub_if_data *msdata;
	struct ieee80211_if_sta *ifsta;

	ifsta = &sdata->u.sta;
	INIT_WORK(&ifsta->work, ieee80211_sta_work);
	setup_timer(&ifsta->timer, ieee80211_sta_timer,
	(unsigned long) sdata);
	skb_queue_head_init(&ifsta->skb_queue);

	ifsta->capab = WLAN_CAPABILITY_ESS;
	ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN \|
	IEEE80211_AUTH_ALG_SHARED_KEY;
	ifsta->create_ibss = 1;
	ifsta->wmm_enabled = 1;
	ifsta->auto_channel_sel = 1;
	ifsta->auto_bssid_sel = 1;

	msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
	sdata->bss = &msdata->u.ap;
	break;
	}
	case IEEE80211_IF_TYPE_MNTR:
	dev->type = ARPHRD_IEEE80211_RADIOTAP;
	dev->hard_start_xmit = ieee80211_monitor_start_xmit;
	break;
	default:
	printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
	dev->name, __FUNCTION__, type);
	}
	ieee80211_debugfs_change_if_type(sdata, oldtype);
	ieee80211_update_default_wep_only(local);
	}

	/* Must be called with rtnl lock held. */
	void ieee80211_if_reinit(struct net_device *dev)
	{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct sta_info *sta;
	int i;

	ASSERT_RTNL();
	ieee80211_if_sdata_deinit(sdata);
	for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
	if (!sdata->keys[i])
	continue;
	#if 0
	/* The interface is down at the moment, so there is not
	* really much point in disabling the keys at this point. */
	memset(addr, 0xff, ETH_ALEN);
	if (local->ops->set_key)
	local->ops->set_key(local_to_hw(local), DISABLE_KEY, addr,
	local->keys[i], 0);
	#endif
	ieee80211_key_free(sdata->keys[i]);
	sdata->keys[i] = NULL;
	}

	switch (sdata->type) {
	case IEEE80211_IF_TYPE_AP: {
	/* Remove all virtual interfaces that use this BSS
	* as their sdata->bss */
	struct ieee80211_sub_if_data tsdata, n;
	LIST_HEAD(tmp_list);

	write_lock_bh(&local->sub_if_lock);
	list_for_each_entry_safe(tsdata, n, &local->sub_if_list, list) {
	if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
	printk(KERN_DEBUG "%s: removing virtual "
	"interface %s because its BSS interface"
	" is being removed\n",
	sdata->dev->name, tsdata->dev->name);
	list_move_tail(&tsdata->list, &tmp_list);
	}
	}
	write_unlock_bh(&local->sub_if_lock);

	list_for_each_entry_safe(tsdata, n, &tmp_list, list)
	__ieee80211_if_del(local, tsdata);

	kfree(sdata->u.ap.beacon_head);
	kfree(sdata->u.ap.beacon_tail);
	kfree(sdata->u.ap.generic_elem);

	if (dev != local->mdev) {
	struct sk_buff *skb;
	while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
	local->total_ps_buffered--;
	dev_kfree_skb(skb);
	}
	}

	break;
	}
	case IEEE80211_IF_TYPE_WDS:
	sta = sta_info_get(local, sdata->u.wds.remote_addr);
	if (sta) {
	sta_info_put(sta);
	sta_info_free(sta, 0);
	} else {
	#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
	printk(KERN_DEBUG "%s: Someone had deleted my STA "
	"entry for the WDS link\n", dev->name);
	#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
	}
	break;
	case IEEE80211_IF_TYPE_STA:
	case IEEE80211_IF_TYPE_IBSS:
	kfree(sdata->u.sta.extra_ie);
	sdata->u.sta.extra_ie = NULL;
	kfree(sdata->u.sta.assocreq_ies);
	sdata->u.sta.assocreq_ies = NULL;
	kfree(sdata->u.sta.assocresp_ies);
	sdata->u.sta.assocresp_ies = NULL;
	if (sdata->u.sta.probe_resp) {
	dev_kfree_skb(sdata->u.sta.probe_resp);
	sdata->u.sta.probe_resp = NULL;
	}

	break;
	case IEEE80211_IF_TYPE_MNTR:
	dev->type = ARPHRD_ETHER;
	break;
	}

	/* remove all STAs that are bound to this virtual interface */
	sta_info_flush(local, dev);

	memset(&sdata->u, 0, sizeof(sdata->u));
	ieee80211_if_sdata_init(sdata);
	}

	/* Must be called with rtnl lock held. */
	void __ieee80211_if_del(struct ieee80211_local *local,
	struct ieee80211_sub_if_data *sdata)
	{
	struct net_device *dev = sdata->dev;

	ieee80211_debugfs_remove_netdev(sdata);
	unregister_netdevice(dev);
	/* Except master interface, the net_device will be freed by
	* net_device->destructor (i. e. ieee80211_if_free). */
	}

	/* Must be called with rtnl lock held. */
	int ieee80211_if_remove(struct net_device dev, const char name, int id)
	{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data sdata, n;

	ASSERT_RTNL();

	write_lock_bh(&local->sub_if_lock);
	list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
	if ((sdata->type == id \|\| id == -1) &&
	strcmp(name, sdata->dev->name) == 0 &&
	sdata->dev != local->mdev) {
	list_del(&sdata->list);
	write_unlock_bh(&local->sub_if_lock);
	__ieee80211_if_del(local, sdata);
	ieee80211_update_default_wep_only(local);
	return 0;
	}
	}
	write_unlock_bh(&local->sub_if_lock);
	return -ENODEV;
	}

	void ieee80211_if_free(struct net_device *dev)
	{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	/* local->apdev must be NULL when freeing management interface */
	BUG_ON(dev == local->apdev);
	ieee80211_if_sdata_deinit(sdata);
	free_netdev(dev);
	}