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>
17 #include <linux/timer.h>
19 #include <net/mac80211.h>
20 #include "ieee80211_i.h"
21 #include "ieee80211_rate.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);
78 static void sta_info_release(struct kref *kref)
80 struct sta_info *sta = container_of(kref, struct sta_info, kref);
81 struct ieee80211_local *local = sta->local;
85 /* free sta structure; it has already been removed from
86 * hash table etc. external structures. Make sure that all
87 * buffered frames are release (one might have been added
88 * after sta_info_free() was called). */
89 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
90 local->total_ps_buffered--;
91 dev_kfree_skb_any(skb);
93 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
94 dev_kfree_skb_any(skb);
96 for (i = 0; i < STA_TID_NUM; i++) {
97 del_timer_sync(&sta->ampdu_mlme.tid_rx[i].session_timer);
98 del_timer_sync(&sta->ampdu_mlme.tid_tx[i].addba_resp_timer);
100 rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
101 rate_control_put(sta->rate_ctrl);
106 void sta_info_put(struct sta_info *sta)
108 kref_put(&sta->kref, sta_info_release);
110 EXPORT_SYMBOL(sta_info_put);
113 struct sta_info * sta_info_add(struct ieee80211_local *local,
114 struct net_device *dev, u8 *addr, gfp_t gfp)
116 struct sta_info *sta;
118 DECLARE_MAC_BUF(mac);
120 sta = kzalloc(sizeof(*sta), gfp);
124 kref_init(&sta->kref);
126 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
127 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, gfp);
128 if (!sta->rate_ctrl_priv) {
129 rate_control_put(sta->rate_ctrl);
134 memcpy(sta->addr, addr, ETH_ALEN);
137 spin_lock_init(&sta->ampdu_mlme.ampdu_rx);
138 spin_lock_init(&sta->ampdu_mlme.ampdu_tx);
139 for (i = 0; i < STA_TID_NUM; i++) {
140 /* timer_to_tid must be initialized with identity mapping to
141 * enable session_timer's data differentiation. refer to
142 * sta_rx_agg_session_timer_expired for useage */
143 sta->timer_to_tid[i] = i;
144 /* tid to tx queue: initialize according to HW (0 is valid) */
145 sta->tid_to_tx_q[i] = local->hw.queues;
147 sta->ampdu_mlme.tid_rx[i].session_timer.function =
148 sta_rx_agg_session_timer_expired;
149 sta->ampdu_mlme.tid_rx[i].session_timer.data =
150 (unsigned long)&sta->timer_to_tid[i];
151 init_timer(&sta->ampdu_mlme.tid_rx[i].session_timer);
153 sta->ampdu_mlme.tid_tx[i].addba_resp_timer.function =
154 sta_addba_resp_timer_expired;
155 sta->ampdu_mlme.tid_tx[i].addba_resp_timer.data =
156 (unsigned long)&sta->timer_to_tid[i];
157 init_timer(&sta->ampdu_mlme.tid_tx[i].addba_resp_timer);
159 skb_queue_head_init(&sta->ps_tx_buf);
160 skb_queue_head_init(&sta->tx_filtered);
161 __sta_info_get(sta); /* sta used by caller, decremented by
163 write_lock_bh(&local->sta_lock);
164 list_add(&sta->list, &local->sta_list);
166 sta_info_hash_add(local, sta);
167 if (local->ops->sta_notify) {
168 struct ieee80211_sub_if_data *sdata;
170 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
171 if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
172 sdata = sdata->u.vlan.ap;
174 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
175 STA_NOTIFY_ADD, addr);
177 write_unlock_bh(&local->sta_lock);
179 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
180 printk(KERN_DEBUG "%s: Added STA %s\n",
181 wiphy_name(local->hw.wiphy), print_mac(mac, addr));
182 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
184 #ifdef CONFIG_MAC80211_DEBUGFS
185 /* debugfs entry adding might sleep, so schedule process
186 * context task for adding entry for STAs that do not yet
188 queue_work(local->hw.workqueue, &local->sta_debugfs_add);
194 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
197 * This format has been mandated by the IEEE specifications,
198 * so this line may not be changed to use the __set_bit() format.
200 bss->tim[aid / 8] |= (1 << (aid % 8));
203 static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
206 * This format has been mandated by the IEEE specifications,
207 * so this line may not be changed to use the __clear_bit() format.
209 bss->tim[aid / 8] &= ~(1 << (aid % 8));
212 static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
213 struct sta_info *sta)
216 __bss_tim_set(bss, sta->aid);
217 if (sta->local->ops->set_tim)
218 sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 1);
221 void sta_info_set_tim_bit(struct sta_info *sta)
223 struct ieee80211_sub_if_data *sdata;
225 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
227 read_lock_bh(&sta->local->sta_lock);
228 __sta_info_set_tim_bit(sdata->bss, sta);
229 read_unlock_bh(&sta->local->sta_lock);
232 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
233 struct sta_info *sta)
236 __bss_tim_clear(bss, sta->aid);
237 if (sta->local->ops->set_tim)
238 sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 0);
241 void sta_info_clear_tim_bit(struct sta_info *sta)
243 struct ieee80211_sub_if_data *sdata;
245 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
247 read_lock_bh(&sta->local->sta_lock);
248 __sta_info_clear_tim_bit(sdata->bss, sta);
249 read_unlock_bh(&sta->local->sta_lock);
252 /* Caller must hold local->sta_lock */
253 void sta_info_remove(struct sta_info *sta)
255 struct ieee80211_local *local = sta->local;
256 struct ieee80211_sub_if_data *sdata;
258 /* don't do anything if we've been removed already */
259 if (sta_info_hash_del(local, sta))
262 list_del(&sta->list);
263 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
264 if (sta->flags & WLAN_STA_PS) {
265 sta->flags &= ~WLAN_STA_PS;
267 atomic_dec(&sdata->bss->num_sta_ps);
268 __sta_info_clear_tim_bit(sdata->bss, sta);
273 void sta_info_free(struct sta_info *sta)
276 struct ieee80211_local *local = sta->local;
277 DECLARE_MAC_BUF(mac);
281 write_lock_bh(&local->sta_lock);
282 sta_info_remove(sta);
283 write_unlock_bh(&local->sta_lock);
285 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
286 local->total_ps_buffered--;
289 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
293 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
294 printk(KERN_DEBUG "%s: Removed STA %s\n",
295 wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr));
296 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
298 ieee80211_key_free(sta->key);
301 if (local->ops->sta_notify) {
302 struct ieee80211_sub_if_data *sdata;
304 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
306 if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
307 sdata = sdata->u.vlan.ap;
309 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
310 STA_NOTIFY_REMOVE, sta->addr);
313 rate_control_remove_sta_debugfs(sta);
314 ieee80211_sta_debugfs_remove(sta);
320 static inline int sta_info_buffer_expired(struct ieee80211_local *local,
321 struct sta_info *sta,
324 struct ieee80211_tx_packet_data *pkt_data;
330 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
332 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
333 timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
335 if (timeout < STA_TX_BUFFER_EXPIRE)
336 timeout = STA_TX_BUFFER_EXPIRE;
337 return time_after(jiffies, pkt_data->jiffies + timeout);
341 static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
342 struct sta_info *sta)
346 struct ieee80211_sub_if_data *sdata;
347 DECLARE_MAC_BUF(mac);
349 if (skb_queue_empty(&sta->ps_tx_buf))
353 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
354 skb = skb_peek(&sta->ps_tx_buf);
355 if (sta_info_buffer_expired(local, sta, skb))
356 skb = __skb_dequeue(&sta->ps_tx_buf);
359 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
364 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
365 local->total_ps_buffered--;
366 printk(KERN_DEBUG "Buffered frame expired (STA "
367 "%s)\n", print_mac(mac, sta->addr));
370 if (skb_queue_empty(&sta->ps_tx_buf))
371 sta_info_clear_tim_bit(sta);
376 static void sta_info_cleanup(unsigned long data)
378 struct ieee80211_local *local = (struct ieee80211_local *) data;
379 struct sta_info *sta;
381 read_lock_bh(&local->sta_lock);
382 list_for_each_entry(sta, &local->sta_list, list) {
384 sta_info_cleanup_expire_buffered(local, sta);
387 read_unlock_bh(&local->sta_lock);
389 local->sta_cleanup.expires =
390 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
391 add_timer(&local->sta_cleanup);
394 #ifdef CONFIG_MAC80211_DEBUGFS
395 static void sta_info_debugfs_add_task(struct work_struct *work)
397 struct ieee80211_local *local =
398 container_of(work, struct ieee80211_local, sta_debugfs_add);
399 struct sta_info *sta, *tmp;
403 read_lock_bh(&local->sta_lock);
404 list_for_each_entry(tmp, &local->sta_list, list) {
405 if (!tmp->debugfs.dir) {
411 read_unlock_bh(&local->sta_lock);
416 ieee80211_sta_debugfs_add(sta);
417 rate_control_add_sta_debugfs(sta);
423 void sta_info_init(struct ieee80211_local *local)
425 rwlock_init(&local->sta_lock);
426 INIT_LIST_HEAD(&local->sta_list);
428 setup_timer(&local->sta_cleanup, sta_info_cleanup,
429 (unsigned long)local);
430 local->sta_cleanup.expires =
431 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
433 #ifdef CONFIG_MAC80211_DEBUGFS
434 INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_task);
438 int sta_info_start(struct ieee80211_local *local)
440 add_timer(&local->sta_cleanup);
444 void sta_info_stop(struct ieee80211_local *local)
446 del_timer(&local->sta_cleanup);
447 sta_info_flush(local, NULL);
451 * sta_info_flush - flush matching STA entries from the STA table
452 * @local: local interface data
453 * @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
455 void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
457 struct sta_info *sta, *tmp;
460 write_lock_bh(&local->sta_lock);
461 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
462 if (!dev || dev == sta->dev) {
464 sta_info_remove(sta);
465 list_add_tail(&sta->list, &tmp_list);
467 write_unlock_bh(&local->sta_lock);
469 list_for_each_entry_safe(sta, tmp, &tmp_list, list) {