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"
23 /* Caller must hold local->sta_lock */
24 static void sta_info_hash_add(struct ieee80211_local *local,
27 sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
28 local->sta_hash[STA_HASH(sta->addr)] = sta;
32 /* Caller must hold local->sta_lock */
33 static void sta_info_hash_del(struct ieee80211_local *local,
38 s = local->sta_hash[STA_HASH(sta->addr)];
41 if (memcmp(s->addr, sta->addr, ETH_ALEN) == 0) {
42 local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
46 while (s->hnext && memcmp(s->hnext->addr, sta->addr, ETH_ALEN) != 0)
49 s->hnext = s->hnext->hnext;
51 printk(KERN_ERR "%s: could not remove STA " MAC_FMT " from "
52 "hash table\n", local->mdev->name, MAC_ARG(sta->addr));
55 static inline void __sta_info_get(struct sta_info *sta)
60 struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
64 spin_lock_bh(&local->sta_lock);
65 sta = local->sta_hash[STA_HASH(addr)];
67 if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
73 spin_unlock_bh(&local->sta_lock);
77 EXPORT_SYMBOL(sta_info_get);
79 int sta_info_min_txrate_get(struct ieee80211_local *local)
82 struct ieee80211_hw_mode *mode;
83 int min_txrate = 9999999;
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];
91 if (sta->txrate < min_txrate)
92 min_txrate = sta->txrate;
96 spin_unlock_bh(&local->sta_lock);
97 if (min_txrate == 9999999)
100 return mode->rates[min_txrate].rate;
104 static void sta_info_release(struct kref *kref)
106 struct sta_info *sta = container_of(kref, struct sta_info, kref);
107 struct ieee80211_local *local = sta->local;
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);
118 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
119 dev_kfree_skb_any(skb);
121 rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
122 rate_control_put(sta->rate_ctrl);
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);
149 kref_put(&sta->kref, sta_info_release);
154 memcpy(sta->addr, addr, ETH_ALEN);
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
161 spin_lock_bh(&local->sta_lock);
162 list_add(&sta->list, &local->sta_list);
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),
169 sta->key_idx_compression = HW_KEY_IDX_INVALID;
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 */
179 static void sta_info_remove(struct sta_info *sta)
181 struct ieee80211_local *local = sta->local;
182 struct ieee80211_sub_if_data *sdata;
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);
196 void sta_info_free(struct sta_info *sta, int locked)
199 struct ieee80211_local *local = sta->local;
202 spin_lock_bh(&local->sta_lock);
203 sta_info_remove(sta);
204 spin_unlock_bh(&local->sta_lock);
206 sta_info_remove(sta);
208 if (local->ops->sta_table_notification)
209 local->ops->sta_table_notification(local_to_hw(local),
212 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
213 local->total_ps_buffered--;
214 dev_kfree_skb_any(skb);
216 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
217 dev_kfree_skb_any(skb);
221 if (local->ops->set_key) {
222 struct ieee80211_key_conf *key;
223 key = ieee80211_key_data2conf(local, sta->key);
225 local->ops->set_key(local_to_hw(local),
227 sta->addr, key, sta->aid);
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;
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;
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 */
248 ieee80211_key_free(sta->key);
256 static inline int sta_info_buffer_expired(struct ieee80211_local *local,
257 struct sta_info *sta,
260 struct ieee80211_tx_packet_data *pkt_data;
266 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
268 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
269 timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
271 if (timeout < STA_TX_BUFFER_EXPIRE)
272 timeout = STA_TX_BUFFER_EXPIRE;
273 return time_after(jiffies, pkt_data->jiffies + timeout);
277 static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
278 struct sta_info *sta)
283 if (skb_queue_empty(&sta->ps_tx_buf))
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;
295 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
298 local->total_ps_buffered--;
299 printk(KERN_DEBUG "Buffered frame expired (STA "
300 MAC_FMT ")\n", MAC_ARG(sta->addr));
308 static void sta_info_cleanup(unsigned long data)
310 struct ieee80211_local *local = (struct ieee80211_local *) data;
311 struct sta_info *sta;
313 spin_lock_bh(&local->sta_lock);
314 list_for_each_entry(sta, &local->sta_list, list) {
316 sta_info_cleanup_expire_buffered(local, sta);
319 spin_unlock_bh(&local->sta_lock);
321 local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
322 add_timer(&local->sta_cleanup);
325 void sta_info_init(struct ieee80211_local *local)
327 spin_lock_init(&local->sta_lock);
328 INIT_LIST_HEAD(&local->sta_list);
329 INIT_LIST_HEAD(&local->deleted_sta_list);
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;
337 int sta_info_start(struct ieee80211_local *local)
339 add_timer(&local->sta_cleanup);
343 void sta_info_stop(struct ieee80211_local *local)
345 struct sta_info *sta, *tmp;
347 del_timer(&local->sta_cleanup);
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);
355 void sta_info_remove_aid_ptr(struct sta_info *sta)
357 struct ieee80211_sub_if_data *sdata;
362 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
364 if (sdata->local->ops->set_tim)
365 sdata->local->ops->set_tim(local_to_hw(sdata->local),
368 __bss_tim_clear(sdata->bss, sta->aid);
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
377 void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
379 struct sta_info *sta, *tmp;
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);