2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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.
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>
18 #include <net/mac80211.h>
19 #include "ieee80211_i.h"
20 #include "ieee80211_rate.h"
22 #include "debugfs_sta.h"
24 /* Caller must hold local->sta_lock */
25 static void sta_info_hash_add(struct ieee80211_local *local,
28 sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
29 local->sta_hash[STA_HASH(sta->addr)] = sta;
33 /* Caller must hold local->sta_lock */
34 static int sta_info_hash_del(struct ieee80211_local *local,
39 s = local->sta_hash[STA_HASH(sta->addr)];
43 local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
47 while (s->hnext && s->hnext != sta)
50 s->hnext = sta->hnext;
57 struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
61 read_lock_bh(&local->sta_lock);
62 sta = local->sta_hash[STA_HASH(addr)];
64 if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
70 read_unlock_bh(&local->sta_lock);
74 EXPORT_SYMBOL(sta_info_get);
76 int sta_info_min_txrate_get(struct ieee80211_local *local)
79 struct ieee80211_hw_mode *mode;
80 int min_txrate = 9999999;
83 read_lock_bh(&local->sta_lock);
84 mode = local->oper_hw_mode;
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 read_unlock_bh(&local->sta_lock);
94 if (min_txrate == 9999999)
97 return mode->rates[min_txrate].rate;
101 static void sta_info_release(struct kref *kref)
103 struct sta_info *sta = container_of(kref, struct sta_info, kref);
104 struct ieee80211_local *local = sta->local;
107 /* free sta structure; it has already been removed from
108 * hash table etc. external structures. Make sure that all
109 * buffered frames are release (one might have been added
110 * after sta_info_free() was called). */
111 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
112 local->total_ps_buffered--;
113 dev_kfree_skb_any(skb);
115 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
116 dev_kfree_skb_any(skb);
118 rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
119 rate_control_put(sta->rate_ctrl);
124 void sta_info_put(struct sta_info *sta)
126 kref_put(&sta->kref, sta_info_release);
128 EXPORT_SYMBOL(sta_info_put);
131 struct sta_info * sta_info_add(struct ieee80211_local *local,
132 struct net_device *dev, u8 *addr, gfp_t gfp)
134 struct sta_info *sta;
136 sta = kzalloc(sizeof(*sta), gfp);
140 kref_init(&sta->kref);
142 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
143 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, gfp);
144 if (!sta->rate_ctrl_priv) {
145 rate_control_put(sta->rate_ctrl);
150 memcpy(sta->addr, addr, ETH_ALEN);
153 skb_queue_head_init(&sta->ps_tx_buf);
154 skb_queue_head_init(&sta->tx_filtered);
155 __sta_info_get(sta); /* sta used by caller, decremented by
157 write_lock_bh(&local->sta_lock);
158 list_add(&sta->list, &local->sta_list);
160 sta_info_hash_add(local, sta);
161 if (local->ops->sta_table_notification)
162 local->ops->sta_table_notification(local_to_hw(local),
164 write_unlock_bh(&local->sta_lock);
166 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
167 printk(KERN_DEBUG "%s: Added STA " MAC_FMT "\n",
168 local->mdev->name, MAC_ARG(addr));
169 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
171 #ifdef CONFIG_MAC80211_DEBUGFS
172 /* debugfs entry adding might sleep, so schedule process
173 * context task for adding entry for STAs that do not yet
175 queue_work(local->hw.workqueue, &local->sta_debugfs_add);
181 /* Caller must hold local->sta_lock */
182 void sta_info_remove(struct sta_info *sta)
184 struct ieee80211_local *local = sta->local;
185 struct ieee80211_sub_if_data *sdata;
187 /* don't do anything if we've been removed already */
188 if (sta_info_hash_del(local, sta))
191 list_del(&sta->list);
192 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
193 if (sta->flags & WLAN_STA_PS) {
194 sta->flags &= ~WLAN_STA_PS;
196 atomic_dec(&sdata->bss->num_sta_ps);
199 sta_info_remove_aid_ptr(sta);
201 if (local->ops->sta_table_notification)
202 local->ops->sta_table_notification(local_to_hw(local),
206 void sta_info_free(struct sta_info *sta)
209 struct ieee80211_local *local = sta->local;
213 write_lock_bh(&local->sta_lock);
214 sta_info_remove(sta);
215 write_unlock_bh(&local->sta_lock);
217 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
218 local->total_ps_buffered--;
221 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
225 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
226 printk(KERN_DEBUG "%s: Removed STA " MAC_FMT "\n",
227 local->mdev->name, MAC_ARG(sta->addr));
228 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
230 ieee80211_key_free(sta->key);
233 rate_control_remove_sta_debugfs(sta);
234 ieee80211_sta_debugfs_remove(sta);
240 static inline int sta_info_buffer_expired(struct ieee80211_local *local,
241 struct sta_info *sta,
244 struct ieee80211_tx_packet_data *pkt_data;
250 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
252 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
253 timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
255 if (timeout < STA_TX_BUFFER_EXPIRE)
256 timeout = STA_TX_BUFFER_EXPIRE;
257 return time_after(jiffies, pkt_data->jiffies + timeout);
261 static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
262 struct sta_info *sta)
267 if (skb_queue_empty(&sta->ps_tx_buf))
271 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
272 skb = skb_peek(&sta->ps_tx_buf);
273 if (sta_info_buffer_expired(local, sta, skb)) {
274 skb = __skb_dequeue(&sta->ps_tx_buf);
275 if (skb_queue_empty(&sta->ps_tx_buf))
276 sta->flags &= ~WLAN_STA_TIM;
279 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
282 local->total_ps_buffered--;
283 printk(KERN_DEBUG "Buffered frame expired (STA "
284 MAC_FMT ")\n", MAC_ARG(sta->addr));
292 static void sta_info_cleanup(unsigned long data)
294 struct ieee80211_local *local = (struct ieee80211_local *) data;
295 struct sta_info *sta;
297 read_lock_bh(&local->sta_lock);
298 list_for_each_entry(sta, &local->sta_list, list) {
300 sta_info_cleanup_expire_buffered(local, sta);
303 read_unlock_bh(&local->sta_lock);
305 local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
306 add_timer(&local->sta_cleanup);
309 #ifdef CONFIG_MAC80211_DEBUGFS
310 static void sta_info_debugfs_add_task(struct work_struct *work)
312 struct ieee80211_local *local =
313 container_of(work, struct ieee80211_local, sta_debugfs_add);
314 struct sta_info *sta, *tmp;
318 read_lock_bh(&local->sta_lock);
319 list_for_each_entry(tmp, &local->sta_list, list) {
320 if (!tmp->debugfs.dir) {
326 read_unlock_bh(&local->sta_lock);
331 ieee80211_sta_debugfs_add(sta);
332 rate_control_add_sta_debugfs(sta);
338 void sta_info_init(struct ieee80211_local *local)
340 rwlock_init(&local->sta_lock);
341 INIT_LIST_HEAD(&local->sta_list);
343 init_timer(&local->sta_cleanup);
344 local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
345 local->sta_cleanup.data = (unsigned long) local;
346 local->sta_cleanup.function = sta_info_cleanup;
348 #ifdef CONFIG_MAC80211_DEBUGFS
349 INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_task);
353 int sta_info_start(struct ieee80211_local *local)
355 add_timer(&local->sta_cleanup);
359 void sta_info_stop(struct ieee80211_local *local)
361 del_timer(&local->sta_cleanup);
362 sta_info_flush(local, NULL);
365 void sta_info_remove_aid_ptr(struct sta_info *sta)
367 struct ieee80211_sub_if_data *sdata;
372 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
374 if (sdata->local->ops->set_tim)
375 sdata->local->ops->set_tim(local_to_hw(sdata->local),
378 __bss_tim_clear(sdata->bss, sta->aid);
383 * sta_info_flush - flush matching STA entries from the STA table
384 * @local: local interface data
385 * @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
387 void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
389 struct sta_info *sta, *tmp;
392 write_lock_bh(&local->sta_lock);
393 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
394 if (!dev || dev == sta->dev) {
396 sta_info_remove(sta);
397 list_add_tail(&sta->list, &tmp_list);
399 write_unlock_bh(&local->sta_lock);
401 list_for_each_entry_safe(sta, tmp, &tmp_list, list) {