2 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
9 #include <linux/config.h>
10 #include <linux/version.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/netdevice.h>
14 #include <linux/types.h>
15 #include <linux/slab.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
19 #include <net/ieee80211.h>
20 #include "ieee80211_i.h"
21 #include "ieee80211_proc.h"
22 #include "rate_control.h"
25 /* Caller must hold local->sta_lock */
26 static void sta_info_hash_add(struct ieee80211_local
*local
,
29 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->addr
)];
30 local
->sta_hash
[STA_HASH(sta
->addr
)] = sta
;
34 /* Caller must hold local->sta_lock */
35 static void sta_info_hash_del(struct ieee80211_local
*local
,
40 s
= local
->sta_hash
[STA_HASH(sta
->addr
)];
43 if (memcmp(s
->addr
, sta
->addr
, ETH_ALEN
) == 0) {
44 local
->sta_hash
[STA_HASH(sta
->addr
)] = s
->hnext
;
48 while (s
->hnext
!= NULL
&&
49 memcmp(s
->hnext
->addr
, sta
->addr
, ETH_ALEN
) != 0)
52 s
->hnext
= s
->hnext
->hnext
;
54 printk(KERN_ERR
"%s: could not remove STA " MACSTR
" from "
55 "hash table\n", local
->mdev
->name
, MAC2STR(sta
->addr
));
59 struct sta_info
* sta_info_get(struct ieee80211_local
*local
, u8
*addr
)
63 spin_lock_bh(&local
->sta_lock
);
64 sta
= local
->sta_hash
[STA_HASH(addr
)];
66 if (memcmp(sta
->addr
, addr
, ETH_ALEN
) == 0) {
67 atomic_inc(&sta
->users
);
72 spin_unlock_bh(&local
->sta_lock
);
78 int sta_info_min_txrate_get(struct ieee80211_local
*local
)
81 int min_txrate
= 9999999;
84 spin_lock_bh(&local
->sta_lock
);
85 for (i
= 0; i
< STA_HASH_SIZE
; i
++) {
86 sta
= local
->sta_hash
[i
];
88 if (sta
->txrate
< min_txrate
)
89 min_txrate
= sta
->txrate
;
93 spin_unlock_bh(&local
->sta_lock
);
94 if (min_txrate
== 9999999)
101 void sta_info_release(struct ieee80211_local
*local
, struct sta_info
*sta
)
105 if (!atomic_dec_and_test(&sta
->users
))
108 /* free sta structure; it has already been removed from
109 * hash table etc. external structures. Make sure that all
110 * buffered frames are release (one might have been added
111 * after sta_info_free() was called). */
112 while ((skb
= skb_dequeue(&sta
->ps_tx_buf
)) != NULL
) {
113 local
->total_ps_buffered
--;
114 dev_kfree_skb_any(skb
);
116 while ((skb
= skb_dequeue(&sta
->tx_filtered
)) != NULL
) {
117 dev_kfree_skb_any(skb
);
119 rate_control_free_sta(local
, sta
->rate_ctrl_priv
);
124 struct sta_info
* sta_info_add(struct ieee80211_local
*local
,
125 struct net_device
*dev
, u8
*addr
)
127 struct sta_info
*sta
;
129 sta
= kmalloc(sizeof(*sta
), GFP_ATOMIC
);
133 memset(sta
, 0, sizeof(*sta
));
135 sta
->rate_ctrl_priv
= rate_control_alloc_sta(local
);
136 if (sta
->rate_ctrl_priv
== NULL
) {
141 memcpy(sta
->addr
, addr
, ETH_ALEN
);
143 skb_queue_head_init(&sta
->ps_tx_buf
);
144 skb_queue_head_init(&sta
->tx_filtered
);
145 atomic_inc(&sta
->users
); /* sta in hashlist etc, decremented by
147 atomic_inc(&sta
->users
); /* sta used by caller, decremented by
148 * sta_info_release() */
149 spin_lock_bh(&local
->sta_lock
);
150 list_add(&sta
->list
, &local
->sta_list
);
152 sta_info_hash_add(local
, sta
);
153 spin_unlock_bh(&local
->sta_lock
);
154 if (local
->hw
->sta_table_notification
)
155 local
->hw
->sta_table_notification(local
->mdev
, local
->num_sta
);
156 sta
->key_idx_compression
= HW_KEY_IDX_INVALID
;
158 #ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
159 printk(KERN_DEBUG
"%s: Added STA " MACSTR
"\n",
160 dev
->name
, MAC2STR(addr
));
161 #endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
163 if (!in_interrupt()) {
164 ieee80211_proc_init_sta(local
, sta
);
166 /* procfs entry adding might sleep, so schedule process context
167 * task for adding proc entry for STAs that do not yet have
169 schedule_work(&local
->sta_proc_add
);
176 void sta_info_free(struct ieee80211_local
*local
, struct sta_info
*sta
,
180 struct ieee80211_sub_if_data
*sdata
;
183 spin_lock_bh(&local
->sta_lock
);
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
;
190 atomic_dec(&sdata
->bss
->num_sta_ps
);
193 sta_info_remove_aid_ptr(sta
);
195 spin_unlock_bh(&local
->sta_lock
);
196 if (local
->hw
->sta_table_notification
)
197 local
->hw
->sta_table_notification(local
->mdev
, local
->num_sta
);
199 while ((skb
= skb_dequeue(&sta
->ps_tx_buf
)) != NULL
) {
200 local
->total_ps_buffered
--;
201 dev_kfree_skb_any(skb
);
203 while ((skb
= skb_dequeue(&sta
->tx_filtered
)) != NULL
) {
204 dev_kfree_skb_any(skb
);
208 if (local
->hw
->set_key
) {
209 struct ieee80211_key_conf
*key
;
210 key
= ieee80211_key_data2conf(local
, sta
->key
);
212 local
->hw
->set_key(local
->mdev
, DISABLE_KEY
,
213 sta
->addr
, key
, sta
->aid
);
219 } else if (sta
->key_idx_compression
!= HW_KEY_IDX_INVALID
) {
220 struct ieee80211_key_conf conf
;
221 memset(&conf
, 0, sizeof(conf
));
222 conf
.hw_key_idx
= sta
->key_idx_compression
;
224 conf
.force_sw_encrypt
= 1;
225 local
->hw
->set_key(local
->mdev
, DISABLE_KEY
, sta
->addr
, &conf
,
227 sta
->key_idx_compression
= HW_KEY_IDX_INVALID
;
230 #ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
231 printk(KERN_DEBUG
"%s: Removed STA " MACSTR
"\n",
232 local
->mdev
->name
, MAC2STR(sta
->addr
));
233 #endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
235 ieee80211_proc_deinit_sta(local
, sta
);
237 if (atomic_read(&sta
->users
) != 1) {
238 /* This is OK, but printed for debugging. The station structure
239 * will be removed when the other user of the data calls
240 * sta_info_release(). */
241 printk(KERN_DEBUG
"%s: STA " MACSTR
" users count %d when "
242 "removing it\n", local
->mdev
->name
, MAC2STR(sta
->addr
),
243 atomic_read(&sta
->users
));
246 sta_info_release(local
, sta
);
250 static inline int sta_info_buffer_expired(struct sk_buff
*skb
)
252 struct ieee80211_tx_packet_data
*pkt_data
;
256 /* TODO: this could be improved by passing STA listen interval into
257 * the kernel driver and expiring frames after 2 x listen_interval x
260 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
262 if (pkt_data
->magic
!= IEEE80211_CB_MAGIC
)
265 return time_after(jiffies
, pkt_data
->jiffies
+ STA_TX_BUFFER_EXPIRE
);
269 static void sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
270 struct sta_info
*sta
)
275 if (skb_queue_empty(&sta
->ps_tx_buf
))
279 spin_lock_irqsave(&sta
->ps_tx_buf
.lock
, flags
);
280 skb
= skb_peek(&sta
->ps_tx_buf
);
281 if (sta_info_buffer_expired(skb
))
282 skb
= __skb_dequeue(&sta
->ps_tx_buf
);
285 spin_unlock_irqrestore(&sta
->ps_tx_buf
.lock
, flags
);
288 local
->total_ps_buffered
--;
289 printk(KERN_DEBUG
"Buffered frame expired (STA "
290 MACSTR
")\n", MAC2STR(sta
->addr
));
298 static void sta_info_cleanup(unsigned long data
)
300 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
301 struct list_head
*ptr
;
303 spin_lock_bh(&local
->sta_lock
);
304 ptr
= local
->sta_list
.next
;
305 while (ptr
&& ptr
!= &local
->sta_list
) {
306 struct sta_info
*sta
= (struct sta_info
*) ptr
;
307 atomic_inc(&sta
->users
);
308 sta_info_cleanup_expire_buffered(local
, sta
);
309 sta_info_release(local
, sta
);
312 spin_unlock_bh(&local
->sta_lock
);
314 local
->sta_cleanup
.expires
= jiffies
+ STA_INFO_CLEANUP_INTERVAL
;
315 add_timer(&local
->sta_cleanup
);
319 static void sta_info_proc_add_task(void *data
)
321 struct ieee80211_local
*local
= data
;
322 struct list_head
*ptr
;
323 struct sta_info
*sta
;
326 while (max_adds
> 0) {
328 spin_lock_bh(&local
->sta_lock
);
329 list_for_each(ptr
, &local
->sta_list
) {
330 sta
= list_entry(ptr
, struct sta_info
, list
);
331 if (!sta
->proc_entry_added
) {
332 atomic_inc(&sta
->users
);
337 spin_unlock_bh(&local
->sta_lock
);
342 ieee80211_proc_init_sta(local
, sta
);
343 atomic_dec(&sta
->users
);
350 void sta_info_init(struct ieee80211_local
*local
)
352 spin_lock_init(&local
->sta_lock
);
353 INIT_LIST_HEAD(&local
->sta_list
);
355 init_timer(&local
->sta_cleanup
);
356 local
->sta_cleanup
.expires
= jiffies
+ STA_INFO_CLEANUP_INTERVAL
;
357 local
->sta_cleanup
.data
= (unsigned long) local
;
358 local
->sta_cleanup
.function
= sta_info_cleanup
;
360 INIT_WORK(&local
->sta_proc_add
, sta_info_proc_add_task
, local
);
363 void sta_info_start(struct ieee80211_local
*local
)
365 add_timer(&local
->sta_cleanup
);
368 void sta_info_stop(struct ieee80211_local
*local
)
370 struct list_head
*ptr
;
372 del_timer(&local
->sta_cleanup
);
374 ptr
= local
->sta_list
.next
;
375 while (ptr
&& ptr
!= &local
->sta_list
) {
376 struct sta_info
*sta
= (struct sta_info
*) ptr
;
378 sta_info_free(local
, sta
, 0);
383 void sta_info_remove_aid_ptr(struct sta_info
*sta
)
385 struct ieee80211_sub_if_data
*sdata
;
387 sdata
= IEEE80211_DEV_TO_SUB_IF(sta
->dev
);
388 if (sta
->aid
<= 0 || !sdata
->bss
)
391 sdata
->bss
->sta_aid
[sta
->aid
- 1] = NULL
;
392 if (sta
->aid
== sdata
->bss
->max_aid
) {
393 while (sdata
->bss
->max_aid
> 0 &&
394 sdata
->bss
->sta_aid
[sdata
->bss
->max_aid
- 1] == NULL
)
395 sdata
->bss
->max_aid
--;
401 * sta_info_flush - flush matching STA entries from the STA table
402 * @local: local interface data
403 * @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
405 void sta_info_flush(struct ieee80211_local
*local
, struct net_device
*dev
)
407 struct list_head
*ptr
, *n
;
409 spin_lock_bh(&local
->sta_lock
);
411 list_for_each_safe(ptr
, n
, &local
->sta_list
) {
412 struct sta_info
*sta
= list_entry(ptr
, struct sta_info
, list
);
413 if (dev
== NULL
|| dev
== sta
->dev
)
414 sta_info_free(local
, sta
, 1);
416 spin_unlock_bh(&local
->sta_lock
);