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_key.h"
23 #include "debugfs_sta.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 int sta_info_hash_del(struct ieee80211_local *local,
40 s = local->sta_hash[STA_HASH(sta->addr)];
44 local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
48 while (s->hnext && s->hnext != sta)
51 s->hnext = sta->hnext;
58 struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
62 read_lock_bh(&local->sta_lock);
63 sta = local->sta_hash[STA_HASH(addr)];
65 if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
71 read_unlock_bh(&local->sta_lock);
75 EXPORT_SYMBOL(sta_info_get);
77 int sta_info_min_txrate_get(struct ieee80211_local *local)
80 struct ieee80211_hw_mode *mode;
81 int min_txrate = 9999999;
84 read_lock_bh(&local->sta_lock);
85 mode = local->oper_hw_mode;
86 for (i = 0; i < STA_HASH_SIZE; i++) {
87 sta = local->sta_hash[i];
89 if (sta->txrate < min_txrate)
90 min_txrate = sta->txrate;
94 read_unlock_bh(&local->sta_lock);
95 if (min_txrate == 9999999)
98 return mode->rates[min_txrate].rate;
102 static void sta_info_release(struct kref *kref)
104 struct sta_info *sta = container_of(kref, struct sta_info, kref);
105 struct ieee80211_local *local = sta->local;
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(sta->rate_ctrl, sta->rate_ctrl_priv);
120 rate_control_put(sta->rate_ctrl);
122 ieee80211_debugfs_key_sta_del(sta->key, sta);
127 void sta_info_put(struct sta_info *sta)
129 kref_put(&sta->kref, sta_info_release);
131 EXPORT_SYMBOL(sta_info_put);
134 struct sta_info * sta_info_add(struct ieee80211_local *local,
135 struct net_device *dev, u8 *addr, gfp_t gfp)
137 struct sta_info *sta;
139 sta = kzalloc(sizeof(*sta), gfp);
143 kref_init(&sta->kref);
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);
153 memcpy(sta->addr, addr, ETH_ALEN);
156 skb_queue_head_init(&sta->ps_tx_buf);
157 skb_queue_head_init(&sta->tx_filtered);
158 __sta_info_get(sta); /* sta used by caller, decremented by
160 write_lock_bh(&local->sta_lock);
161 list_add(&sta->list, &local->sta_list);
163 sta_info_hash_add(local, sta);
164 if (local->ops->sta_table_notification)
165 local->ops->sta_table_notification(local_to_hw(local),
167 write_unlock_bh(&local->sta_lock);
169 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
170 printk(KERN_DEBUG "%s: Added STA " MAC_FMT "\n",
171 local->mdev->name, MAC_ARG(addr));
172 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
174 #ifdef CONFIG_MAC80211_DEBUGFS
175 /* debugfs entry adding might sleep, so schedule process
176 * context task for adding entry for STAs that do not yet
178 queue_work(local->hw.workqueue, &local->sta_debugfs_add);
184 /* Caller must hold local->sta_lock */
185 void sta_info_remove(struct sta_info *sta)
187 struct ieee80211_local *local = sta->local;
188 struct ieee80211_sub_if_data *sdata;
190 /* don't do anything if we've been removed already */
191 if (sta_info_hash_del(local, sta))
194 list_del(&sta->list);
195 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
196 if (sta->flags & WLAN_STA_PS) {
197 sta->flags &= ~WLAN_STA_PS;
199 atomic_dec(&sdata->bss->num_sta_ps);
202 sta_info_remove_aid_ptr(sta);
204 if (local->ops->sta_table_notification)
205 local->ops->sta_table_notification(local_to_hw(local),
209 void sta_info_free(struct sta_info *sta)
212 struct ieee80211_local *local = sta->local;
216 write_lock_bh(&local->sta_lock);
217 sta_info_remove(sta);
218 write_unlock_bh(&local->sta_lock);
220 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
221 local->total_ps_buffered--;
224 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
228 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
229 printk(KERN_DEBUG "%s: Removed STA " MAC_FMT "\n",
230 local->mdev->name, MAC_ARG(sta->addr));
231 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
234 ieee80211_debugfs_key_remove(sta->key);
235 ieee80211_key_free(sta->key);
239 rate_control_remove_sta_debugfs(sta);
240 ieee80211_sta_debugfs_remove(sta);
246 static inline int sta_info_buffer_expired(struct ieee80211_local *local,
247 struct sta_info *sta,
250 struct ieee80211_tx_packet_data *pkt_data;
256 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
258 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
259 timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
261 if (timeout < STA_TX_BUFFER_EXPIRE)
262 timeout = STA_TX_BUFFER_EXPIRE;
263 return time_after(jiffies, pkt_data->jiffies + timeout);
267 static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
268 struct sta_info *sta)
273 if (skb_queue_empty(&sta->ps_tx_buf))
277 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
278 skb = skb_peek(&sta->ps_tx_buf);
279 if (sta_info_buffer_expired(local, sta, skb)) {
280 skb = __skb_dequeue(&sta->ps_tx_buf);
281 if (skb_queue_empty(&sta->ps_tx_buf))
282 sta->flags &= ~WLAN_STA_TIM;
285 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
288 local->total_ps_buffered--;
289 printk(KERN_DEBUG "Buffered frame expired (STA "
290 MAC_FMT ")\n", MAC_ARG(sta->addr));
298 static void sta_info_cleanup(unsigned long data)
300 struct ieee80211_local *local = (struct ieee80211_local *) data;
301 struct sta_info *sta;
303 read_lock_bh(&local->sta_lock);
304 list_for_each_entry(sta, &local->sta_list, list) {
306 sta_info_cleanup_expire_buffered(local, sta);
309 read_unlock_bh(&local->sta_lock);
311 local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
312 add_timer(&local->sta_cleanup);
315 #ifdef CONFIG_MAC80211_DEBUGFS
316 static void sta_info_debugfs_add_task(struct work_struct *work)
318 struct ieee80211_local *local =
319 container_of(work, struct ieee80211_local, sta_debugfs_add);
320 struct sta_info *sta, *tmp;
324 read_lock_bh(&local->sta_lock);
325 list_for_each_entry(tmp, &local->sta_list, list) {
326 if (!tmp->debugfs.dir) {
332 read_unlock_bh(&local->sta_lock);
337 ieee80211_sta_debugfs_add(sta);
338 rate_control_add_sta_debugfs(sta);
344 void sta_info_init(struct ieee80211_local *local)
346 rwlock_init(&local->sta_lock);
347 INIT_LIST_HEAD(&local->sta_list);
349 init_timer(&local->sta_cleanup);
350 local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
351 local->sta_cleanup.data = (unsigned long) local;
352 local->sta_cleanup.function = sta_info_cleanup;
354 #ifdef CONFIG_MAC80211_DEBUGFS
355 INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_task);
359 int sta_info_start(struct ieee80211_local *local)
361 add_timer(&local->sta_cleanup);
365 void sta_info_stop(struct ieee80211_local *local)
367 del_timer(&local->sta_cleanup);
368 sta_info_flush(local, NULL);
371 void sta_info_remove_aid_ptr(struct sta_info *sta)
373 struct ieee80211_sub_if_data *sdata;
378 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
380 if (sdata->local->ops->set_tim)
381 sdata->local->ops->set_tim(local_to_hw(sdata->local),
384 __bss_tim_clear(sdata->bss, sta->aid);
389 * sta_info_flush - flush matching STA entries from the STA table
390 * @local: local interface data
391 * @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
393 void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
395 struct sta_info *sta, *tmp;
398 write_lock_bh(&local->sta_lock);
399 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
400 if (!dev || dev == sta->dev) {
402 sta_info_remove(sta);
403 list_add_tail(&sta->list, &tmp_list);
405 write_unlock_bh(&local->sta_lock);
407 list_for_each_entry_safe(sta, tmp, &tmp_list, list) {