[mirror_ubuntu-jammy-kernel.git] / net / mac80211 / sta_info.c

/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2006-2007	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/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>

#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "ieee80211_rate.h"
#include "sta_info.h"

/* Caller must hold local->sta_lock */
static void sta_info_hash_add(struct ieee80211_local *local,
			      struct sta_info *sta)
{
	sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
	local->sta_hash[STA_HASH(sta->addr)] = sta;
}


/* Caller must hold local->sta_lock */
static void sta_info_hash_del(struct ieee80211_local *local,
			      struct sta_info *sta)
{
	struct sta_info *s;

	s = local->sta_hash[STA_HASH(sta->addr)];
	if (!s)
		return;
	if (memcmp(s->addr, sta->addr, ETH_ALEN) == 0) {
		local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
		return;
	}

	while (s->hnext && memcmp(s->hnext->addr, sta->addr, ETH_ALEN) != 0)
		s = s->hnext;
	if (s->hnext)
		s->hnext = s->hnext->hnext;
	else
		printk(KERN_ERR "%s: could not remove STA " MAC_FMT " from "
		       "hash table\n", local->mdev->name, MAC_ARG(sta->addr));
}

static inline void __sta_info_get(struct sta_info *sta)
{
	kref_get(&sta->kref);
}

struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
{
	struct sta_info *sta;

	spin_lock_bh(&local->sta_lock);
	sta = local->sta_hash[STA_HASH(addr)];
	while (sta) {
		if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
			__sta_info_get(sta);
			break;
		}
		sta = sta->hnext;
	}
	spin_unlock_bh(&local->sta_lock);

	return sta;
}
EXPORT_SYMBOL(sta_info_get);

int sta_info_min_txrate_get(struct ieee80211_local *local)
{
	struct sta_info *sta;
	struct ieee80211_hw_mode *mode;
	int min_txrate = 9999999;
	int i;

	spin_lock_bh(&local->sta_lock);
	mode = local->oper_hw_mode;
	for (i = 0; i < STA_HASH_SIZE; i++) {
		sta = local->sta_hash[i];
		while (sta) {
			if (sta->txrate < min_txrate)
				min_txrate = sta->txrate;
			sta = sta->hnext;
		}
	}
	spin_unlock_bh(&local->sta_lock);
	if (min_txrate == 9999999)
		min_txrate = 0;

	return mode->rates[min_txrate].rate;
}


static void sta_info_release(struct kref *kref)
{
	struct sta_info *sta = container_of(kref, struct sta_info, kref);
	struct ieee80211_local *local = sta->local;
	struct sk_buff *skb;

	/* free sta structure; it has already been removed from
	 * hash table etc. external structures. Make sure that all
	 * buffered frames are release (one might have been added
	 * after sta_info_free() was called). */
	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
		local->total_ps_buffered--;
		dev_kfree_skb_any(skb);
	}
	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
		dev_kfree_skb_any(skb);
	}
	rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
	rate_control_put(sta->rate_ctrl);
	kfree(sta);
}


void sta_info_put(struct sta_info *sta)
{
	kref_put(&sta->kref, sta_info_release);
}
EXPORT_SYMBOL(sta_info_put);


struct sta_info * sta_info_add(struct ieee80211_local *local,
			       struct net_device *dev, u8 *addr, gfp_t gfp)
{
	struct sta_info *sta;

	sta = kzalloc(sizeof(*sta), gfp);
	if (!sta)
		return NULL;

	kref_init(&sta->kref);

	sta->rate_ctrl = rate_control_get(local->rate_ctrl);
	sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, gfp);
	if (!sta->rate_ctrl_priv) {
		rate_control_put(sta->rate_ctrl);
		kref_put(&sta->kref, sta_info_release);
		kfree(sta);
		return NULL;
	}

	memcpy(sta->addr, addr, ETH_ALEN);
	sta->local = local;
	sta->dev = dev;
	skb_queue_head_init(&sta->ps_tx_buf);
	skb_queue_head_init(&sta->tx_filtered);
	__sta_info_get(sta);	/* sta used by caller, decremented by
				 * sta_info_put() */
	spin_lock_bh(&local->sta_lock);
	list_add(&sta->list, &local->sta_list);
	local->num_sta++;
	sta_info_hash_add(local, sta);
	spin_unlock_bh(&local->sta_lock);
	if (local->ops->sta_table_notification)
		local->ops->sta_table_notification(local_to_hw(local),
						  local->num_sta);
	sta->key_idx_compression = HW_KEY_IDX_INVALID;

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
	printk(KERN_DEBUG "%s: Added STA " MAC_FMT "\n",
	       local->mdev->name, MAC_ARG(addr));
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */

	return sta;
}

static void sta_info_remove(struct sta_info *sta)
{
	struct ieee80211_local *local = sta->local;
	struct ieee80211_sub_if_data *sdata;

	sta_info_hash_del(local, sta);
	list_del(&sta->list);
	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
	if (sta->flags & WLAN_STA_PS) {
		sta->flags &= ~WLAN_STA_PS;
		if (sdata->bss)
			atomic_dec(&sdata->bss->num_sta_ps);
	}
	local->num_sta--;
	sta_info_remove_aid_ptr(sta);
}

void sta_info_free(struct sta_info *sta, int locked)
{
	struct sk_buff *skb;
	struct ieee80211_local *local = sta->local;

	if (!locked) {
		spin_lock_bh(&local->sta_lock);
		sta_info_remove(sta);
		spin_unlock_bh(&local->sta_lock);
	} else {
		sta_info_remove(sta);
	}
	if (local->ops->sta_table_notification)
		local->ops->sta_table_notification(local_to_hw(local),
						  local->num_sta);

	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
		local->total_ps_buffered--;
		dev_kfree_skb_any(skb);
	}
	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
		dev_kfree_skb_any(skb);
	}

	if (sta->key) {
		if (local->ops->set_key) {
			struct ieee80211_key_conf *key;
			key = ieee80211_key_data2conf(local, sta->key);
			if (key) {
				local->ops->set_key(local_to_hw(local),
						   DISABLE_KEY,
						   sta->addr, key, sta->aid);
				kfree(key);
			}
		}
	} else if (sta->key_idx_compression != HW_KEY_IDX_INVALID) {
		struct ieee80211_key_conf conf;
		memset(&conf, 0, sizeof(conf));
		conf.hw_key_idx = sta->key_idx_compression;
		conf.alg = ALG_NULL;
		conf.flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
		local->ops->set_key(local_to_hw(local), DISABLE_KEY,
				   sta->addr, &conf, sta->aid);
		sta->key_idx_compression = HW_KEY_IDX_INVALID;
	}

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
	printk(KERN_DEBUG "%s: Removed STA " MAC_FMT "\n",
	       local->mdev->name, MAC_ARG(sta->addr));
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */

	if (sta->key) {
		ieee80211_key_free(sta->key);
		sta->key = NULL;
	}

	sta_info_put(sta);
}


static inline int sta_info_buffer_expired(struct ieee80211_local *local,
					  struct sta_info *sta,
					  struct sk_buff *skb)
{
	struct ieee80211_tx_packet_data *pkt_data;
	int timeout;

	if (!skb)
		return 0;

	pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;

	/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
	timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
		   15625) * HZ;
	if (timeout < STA_TX_BUFFER_EXPIRE)
		timeout = STA_TX_BUFFER_EXPIRE;
	return time_after(jiffies, pkt_data->jiffies + timeout);
}


static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
					     struct sta_info *sta)
{
	unsigned long flags;
	struct sk_buff *skb;

	if (skb_queue_empty(&sta->ps_tx_buf))
		return;

	for (;;) {
		spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
		skb = skb_peek(&sta->ps_tx_buf);
		if (sta_info_buffer_expired(local, sta, skb)) {
			skb = __skb_dequeue(&sta->ps_tx_buf);
			if (skb_queue_empty(&sta->ps_tx_buf))
				sta->flags &= ~WLAN_STA_TIM;
		} else
			skb = NULL;
		spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);

		if (skb) {
			local->total_ps_buffered--;
			printk(KERN_DEBUG "Buffered frame expired (STA "
			       MAC_FMT ")\n", MAC_ARG(sta->addr));
			dev_kfree_skb(skb);
		} else
			break;
	}
}


static void sta_info_cleanup(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *) data;
	struct sta_info *sta;

	spin_lock_bh(&local->sta_lock);
	list_for_each_entry(sta, &local->sta_list, list) {
		__sta_info_get(sta);
		sta_info_cleanup_expire_buffered(local, sta);
		sta_info_put(sta);
	}
	spin_unlock_bh(&local->sta_lock);

	local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
	add_timer(&local->sta_cleanup);
}

void sta_info_init(struct ieee80211_local *local)
{
	spin_lock_init(&local->sta_lock);
	INIT_LIST_HEAD(&local->sta_list);
	INIT_LIST_HEAD(&local->deleted_sta_list);

	init_timer(&local->sta_cleanup);
	local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
	local->sta_cleanup.data = (unsigned long) local;
	local->sta_cleanup.function = sta_info_cleanup;
}

int sta_info_start(struct ieee80211_local *local)
{
	add_timer(&local->sta_cleanup);
	return 0;
}

void sta_info_stop(struct ieee80211_local *local)
{
	struct sta_info *sta, *tmp;

	del_timer(&local->sta_cleanup);

	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
		/*  We don't need locking at this point. */
		sta_info_free(sta, 0);
	}
}

void sta_info_remove_aid_ptr(struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata;

	if (sta->aid <= 0)
		return;

	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);

	if (sdata->local->ops->set_tim)
		sdata->local->ops->set_tim(local_to_hw(sdata->local),
					  sta->aid, 0);
	if (sdata->bss)
		__bss_tim_clear(sdata->bss, sta->aid);
}


/**
 * sta_info_flush - flush matching STA entries from the STA table
 * @local: local interface data
 * @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
 */
void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
{
	struct sta_info *sta, *tmp;

	spin_lock_bh(&local->sta_lock);
	list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
		if (!dev || dev == sta->dev)
			sta_info_free(sta, 1);
	spin_unlock_bh(&local->sta_lock);
}
Commit	Line	Data
f0706e82 JB	1	/*
	2	* Copyright 2002-2005, Instant802 Networks, Inc.
	3	* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/netdevice.h>
	13	#include <linux/types.h>
	14	#include <linux/slab.h>
	15	#include <linux/skbuff.h>
	16	#include <linux/if_arp.h>
	17
	18	#include <net/mac80211.h>
	19	#include "ieee80211_i.h"
	20	#include "ieee80211_rate.h"
	21	#include "sta_info.h"
	22
	23	/* Caller must hold local->sta_lock */
	24	static void sta_info_hash_add(struct ieee80211_local *local,
	25	struct sta_info *sta)
	26	{
	27	sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
	28	local->sta_hash[STA_HASH(sta->addr)] = sta;
	29	}
	30
	31
	32	/* Caller must hold local->sta_lock */
	33	static void sta_info_hash_del(struct ieee80211_local *local,
	34	struct sta_info *sta)
	35	{
	36	struct sta_info *s;
	37
	38	s = local->sta_hash[STA_HASH(sta->addr)];
	39	if (!s)
	40	return;
	41	if (memcmp(s->addr, sta->addr, ETH_ALEN) == 0) {
	42	local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
	43	return;
	44	}
	45
	46	while (s->hnext && memcmp(s->hnext->addr, sta->addr, ETH_ALEN) != 0)
	47	s = s->hnext;
	48	if (s->hnext)
	49	s->hnext = s->hnext->hnext;
	50	else
	51	printk(KERN_ERR "%s: could not remove STA " MAC_FMT " from "
	52	"hash table\n", local->mdev->name, MAC_ARG(sta->addr));
	53	}
	54
	55	static inline void __sta_info_get(struct sta_info *sta)
	56	{
	57	kref_get(&sta->kref);
	58	}
	59
	60	struct sta_info sta_info_get(struct ieee80211_local local, u8 *addr)
	61	{
	62	struct sta_info *sta;
	63
	64	spin_lock_bh(&local->sta_lock);
65	sta = local->sta_hash[STA_HASH(addr)];
66	while (sta) {
67	if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
68	__sta_info_get(sta);
69	break;
70	}
71	sta = sta->hnext;
72	}
73	spin_unlock_bh(&local->sta_lock);
74
75	return sta;
76	}
77	EXPORT_SYMBOL(sta_info_get);
78
79	int sta_info_min_txrate_get(struct ieee80211_local *local)
80	{
81	struct sta_info *sta;
82	struct ieee80211_hw_mode *mode;
83	int min_txrate = 9999999;
84	int i;
85
86	spin_lock_bh(&local->sta_lock);
87	mode = local->oper_hw_mode;
88	for (i = 0; i < STA_HASH_SIZE; i++) {
89	sta = local->sta_hash[i];
90	while (sta) {
91	if (sta->txrate < min_txrate)
92	min_txrate = sta->txrate;
93	sta = sta->hnext;
94	}
95	}
96	spin_unlock_bh(&local->sta_lock);
97	if (min_txrate == 9999999)
98	min_txrate = 0;
99
100	return mode->rates[min_txrate].rate;
101	}
102
103
104	static void sta_info_release(struct kref *kref)
105	{
106	struct sta_info *sta = container_of(kref, struct sta_info, kref);
107	struct ieee80211_local *local = sta->local;
108	struct sk_buff *skb;
109
110	/* free sta structure; it has already been removed from
111	* hash table etc. external structures. Make sure that all
112	* buffered frames are release (one might have been added
113	* after sta_info_free() was called). */
114	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
115	local->total_ps_buffered--;
116	dev_kfree_skb_any(skb);
117	}
118	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
119	dev_kfree_skb_any(skb);
120	}
121	rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
122	rate_control_put(sta->rate_ctrl);
123	kfree(sta);
124	}
125
126
127	void sta_info_put(struct sta_info *sta)
128	{
129	kref_put(&sta->kref, sta_info_release);
130	}
131	EXPORT_SYMBOL(sta_info_put);
132
133
134	struct sta_info * sta_info_add(struct ieee80211_local *local,
135	struct net_device dev, u8 addr, gfp_t gfp)
136	{
137	struct sta_info *sta;
138
139	sta = kzalloc(sizeof(*sta), gfp);
140	if (!sta)
141	return NULL;
142
143	kref_init(&sta->kref);
144
145	sta->rate_ctrl = rate_control_get(local->rate_ctrl);
146	sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, gfp);
147	if (!sta->rate_ctrl_priv) {
148	rate_control_put(sta->rate_ctrl);
149	kref_put(&sta->kref, sta_info_release);
150	kfree(sta);
151	return NULL;
152	}
153
154	memcpy(sta->addr, addr, ETH_ALEN);
155	sta->local = local;
156	sta->dev = dev;
157	skb_queue_head_init(&sta->ps_tx_buf);
158	skb_queue_head_init(&sta->tx_filtered);
159	__sta_info_get(sta); /* sta used by caller, decremented by
160	* sta_info_put() */
161	spin_lock_bh(&local->sta_lock);
162	list_add(&sta->list, &local->sta_list);
163	local->num_sta++;
164	sta_info_hash_add(local, sta);
165	spin_unlock_bh(&local->sta_lock);
166	if (local->ops->sta_table_notification)
167	local->ops->sta_table_notification(local_to_hw(local),
168	local->num_sta);
169	sta->key_idx_compression = HW_KEY_IDX_INVALID;
170
171	#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
172	printk(KERN_DEBUG "%s: Added STA " MAC_FMT "\n",
173	local->mdev->name, MAC_ARG(addr));
174	#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
175
176	return sta;
177	}
178
179	static void sta_info_remove(struct sta_info *sta)
180	{
181	struct ieee80211_local *local = sta->local;
182	struct ieee80211_sub_if_data *sdata;
183
184	sta_info_hash_del(local, sta);
185	list_del(&sta->list);
186	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
187	if (sta->flags & WLAN_STA_PS) {
188	sta->flags &= ~WLAN_STA_PS;
189	if (sdata->bss)
190	atomic_dec(&sdata->bss->num_sta_ps);
191	}
192	local->num_sta--;
193	sta_info_remove_aid_ptr(sta);
194	}
195
196	void sta_info_free(struct sta_info *sta, int locked)
197	{
198	struct sk_buff *skb;
199	struct ieee80211_local *local = sta->local;
200
201	if (!locked) {
202	spin_lock_bh(&local->sta_lock);
203	sta_info_remove(sta);
204	spin_unlock_bh(&local->sta_lock);
205	} else {
206	sta_info_remove(sta);
207	}
208	if (local->ops->sta_table_notification)
209	local->ops->sta_table_notification(local_to_hw(local),
210	local->num_sta);
211
212	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
213	local->total_ps_buffered--;
214	dev_kfree_skb_any(skb);
215	}
216	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
217	dev_kfree_skb_any(skb);
218	}
219
220	if (sta->key) {
221	if (local->ops->set_key) {
222	struct ieee80211_key_conf *key;
223	key = ieee80211_key_data2conf(local, sta->key);
224	if (key) {
225	local->ops->set_key(local_to_hw(local),
226	DISABLE_KEY,
227	sta->addr, key, sta->aid);
228	kfree(key);
229	}
230	}
231	} else if (sta->key_idx_compression != HW_KEY_IDX_INVALID) {
232	struct ieee80211_key_conf conf;
233	memset(&conf, 0, sizeof(conf));
234	conf.hw_key_idx = sta->key_idx_compression;
235	conf.alg = ALG_NULL;
236	conf.flags \|= IEEE80211_KEY_FORCE_SW_ENCRYPT;
237	local->ops->set_key(local_to_hw(local), DISABLE_KEY,
238	sta->addr, &conf, sta->aid);
239	sta->key_idx_compression = HW_KEY_IDX_INVALID;
240	}
241
242	#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
243	printk(KERN_DEBUG "%s: Removed STA " MAC_FMT "\n",
244	local->mdev->name, MAC_ARG(sta->addr));
245	#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
246
247	if (sta->key) {
248	ieee80211_key_free(sta->key);
249	sta->key = NULL;
250	}
251
252	sta_info_put(sta);
253	}
254
255
256	static inline int sta_info_buffer_expired(struct ieee80211_local *local,
257	struct sta_info *sta,
258	struct sk_buff *skb)
259	{
260	struct ieee80211_tx_packet_data *pkt_data;
261	int timeout;
262
263	if (!skb)
264	return 0;
265
266	pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
267
268	/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
269	timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
270	15625) * HZ;
271	if (timeout < STA_TX_BUFFER_EXPIRE)
272	timeout = STA_TX_BUFFER_EXPIRE;
273	return time_after(jiffies, pkt_data->jiffies + timeout);
274	}
275
276
277	static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
278	struct sta_info *sta)
279	{
280	unsigned long flags;
281	struct sk_buff *skb;
282
283	if (skb_queue_empty(&sta->ps_tx_buf))
284	return;
285
286	for (;;) {
287	spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
288	skb = skb_peek(&sta->ps_tx_buf);
289	if (sta_info_buffer_expired(local, sta, skb)) {
290	skb = __skb_dequeue(&sta->ps_tx_buf);
291	if (skb_queue_empty(&sta->ps_tx_buf))
292	sta->flags &= ~WLAN_STA_TIM;
293	} else
294	skb = NULL;
295	spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
296
297	if (skb) {
298	local->total_ps_buffered--;
299	printk(KERN_DEBUG "Buffered frame expired (STA "
300	MAC_FMT ")\n", MAC_ARG(sta->addr));
301	dev_kfree_skb(skb);
302	} else
303	break;
304	}
305	}
306
307
308	static void sta_info_cleanup(unsigned long data)
309	{
310	struct ieee80211_local local = (struct ieee80211_local ) data;
311	struct sta_info *sta;
312
313	spin_lock_bh(&local->sta_lock);
314	list_for_each_entry(sta, &local->sta_list, list) {
315	__sta_info_get(sta);
316	sta_info_cleanup_expire_buffered(local, sta);
317	sta_info_put(sta);
318	}
319	spin_unlock_bh(&local->sta_lock);
320
321	local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
322	add_timer(&local->sta_cleanup);
323	}
324
325	void sta_info_init(struct ieee80211_local *local)
326	{
327	spin_lock_init(&local->sta_lock);
328	INIT_LIST_HEAD(&local->sta_list);
329	INIT_LIST_HEAD(&local->deleted_sta_list);
330
331	init_timer(&local->sta_cleanup);
332	local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
333	local->sta_cleanup.data = (unsigned long) local;
334	local->sta_cleanup.function = sta_info_cleanup;
335	}
336
337	int sta_info_start(struct ieee80211_local *local)
338	{
339	add_timer(&local->sta_cleanup);
340	return 0;
341	}
342
343	void sta_info_stop(struct ieee80211_local *local)
344	{
345	struct sta_info sta, tmp;
346
347	del_timer(&local->sta_cleanup);
348
349	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
350	/* We don't need locking at this point. */
351	sta_info_free(sta, 0);
352	}
353	}
354
355	void sta_info_remove_aid_ptr(struct sta_info *sta)
356	{
357	struct ieee80211_sub_if_data *sdata;
358
359	if (sta->aid <= 0)
360	return;
361
362	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
363
364	if (sdata->local->ops->set_tim)
365	sdata->local->ops->set_tim(local_to_hw(sdata->local),
366	sta->aid, 0);
367	if (sdata->bss)
368	__bss_tim_clear(sdata->bss, sta->aid);
369	}
370
371
372	/**
373	* sta_info_flush - flush matching STA entries from the STA table
374	* @local: local interface data
375	* @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
376	*/
377	void sta_info_flush(struct ieee80211_local local, struct net_device dev)
378	{
379	struct sta_info sta, tmp;
380
381	spin_lock_bh(&local->sta_lock);
382	list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
383	if (!dev \|\| dev == sta->dev)
384	sta_info_free(sta, 1);
385	spin_unlock_bh(&local->sta_lock);
386	}