add devicescape 802.11 stack
[openwrt.git] / target / linux / package / ieee80211-dscape / src / sta_info.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 *
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.
7 */
8
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>
18
19 #include <net/ieee80211.h>
20 #include "ieee80211_i.h"
21 #include "ieee80211_proc.h"
22 #include "rate_control.h"
23
24
25 /* Caller must hold local->sta_lock */
26 static void sta_info_hash_add(struct ieee80211_local *local,
27 struct sta_info *sta)
28 {
29 sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
30 local->sta_hash[STA_HASH(sta->addr)] = sta;
31 }
32
33
34 /* Caller must hold local->sta_lock */
35 static void sta_info_hash_del(struct ieee80211_local *local,
36 struct sta_info *sta)
37 {
38 struct sta_info *s;
39
40 s = local->sta_hash[STA_HASH(sta->addr)];
41 if (s == NULL)
42 return;
43 if (memcmp(s->addr, sta->addr, ETH_ALEN) == 0) {
44 local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
45 return;
46 }
47
48 while (s->hnext != NULL &&
49 memcmp(s->hnext->addr, sta->addr, ETH_ALEN) != 0)
50 s = s->hnext;
51 if (s->hnext != NULL)
52 s->hnext = s->hnext->hnext;
53 else
54 printk(KERN_ERR "%s: could not remove STA " MACSTR " from "
55 "hash table\n", local->mdev->name, MAC2STR(sta->addr));
56 }
57
58
59 struct sta_info * sta_info_get(struct ieee80211_local *local, u8 *addr)
60 {
61 struct sta_info *sta;
62
63 spin_lock_bh(&local->sta_lock);
64 sta = local->sta_hash[STA_HASH(addr)];
65 while (sta) {
66 if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
67 atomic_inc(&sta->users);
68 break;
69 }
70 sta = sta->hnext;
71 }
72 spin_unlock_bh(&local->sta_lock);
73
74 return sta;
75 }
76
77
78 int sta_info_min_txrate_get(struct ieee80211_local *local)
79 {
80 struct sta_info *sta;
81 int min_txrate = 9999999;
82 int i;
83
84 spin_lock_bh(&local->sta_lock);
85 for (i = 0; i < STA_HASH_SIZE; i++) {
86 sta = local->sta_hash[i];
87 while (sta) {
88 if (sta->txrate < min_txrate)
89 min_txrate = sta->txrate;
90 sta = sta->hnext;
91 }
92 }
93 spin_unlock_bh(&local->sta_lock);
94 if (min_txrate == 9999999)
95 min_txrate = 0;
96
97 return min_txrate;
98 }
99
100
101 void sta_info_release(struct ieee80211_local *local, struct sta_info *sta)
102 {
103 struct sk_buff *skb;
104
105 if (!atomic_dec_and_test(&sta->users))
106 return;
107
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);
115 }
116 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
117 dev_kfree_skb_any(skb);
118 }
119 rate_control_free_sta(local, sta->rate_ctrl_priv);
120 kfree(sta);
121 }
122
123
124 struct sta_info * sta_info_add(struct ieee80211_local *local,
125 struct net_device *dev, u8 *addr)
126 {
127 struct sta_info *sta;
128
129 sta = kmalloc(sizeof(*sta), GFP_ATOMIC);
130 if (!sta)
131 return NULL;
132
133 memset(sta, 0, sizeof(*sta));
134
135 sta->rate_ctrl_priv = rate_control_alloc_sta(local);
136 if (sta->rate_ctrl_priv == NULL) {
137 kfree(sta);
138 return NULL;
139 }
140
141 memcpy(sta->addr, addr, ETH_ALEN);
142 sta->dev = dev;
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
146 * sta_info_free() */
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);
151 local->num_sta++;
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;
157
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 */
162
163 if (!in_interrupt()) {
164 ieee80211_proc_init_sta(local, sta);
165 } else {
166 /* procfs entry adding might sleep, so schedule process context
167 * task for adding proc entry for STAs that do not yet have
168 * one. */
169 schedule_work(&local->sta_proc_add);
170 }
171
172 return sta;
173 }
174
175
176 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta,
177 int locked)
178 {
179 struct sk_buff *skb;
180 struct ieee80211_sub_if_data *sdata;
181
182 if (!locked)
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;
189 if (sdata->bss)
190 atomic_dec(&sdata->bss->num_sta_ps);
191 }
192 local->num_sta--;
193 sta_info_remove_aid_ptr(sta);
194 if (!locked)
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);
198
199 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
200 local->total_ps_buffered--;
201 dev_kfree_skb_any(skb);
202 }
203 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
204 dev_kfree_skb_any(skb);
205 }
206
207 if (sta->key) {
208 if (local->hw->set_key) {
209 struct ieee80211_key_conf *key;
210 key = ieee80211_key_data2conf(local, sta->key);
211 if (key) {
212 local->hw->set_key(local->mdev, DISABLE_KEY,
213 sta->addr, key, sta->aid);
214 kfree(key);
215 }
216 }
217 kfree(sta->key);
218 sta->key = NULL;
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;
223 conf.alg = ALG_NULL;
224 conf.force_sw_encrypt = 1;
225 local->hw->set_key(local->mdev, DISABLE_KEY, sta->addr, &conf,
226 sta->aid);
227 sta->key_idx_compression = HW_KEY_IDX_INVALID;
228 }
229
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 */
234
235 ieee80211_proc_deinit_sta(local, sta);
236
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));
244 }
245
246 sta_info_release(local, sta);
247 }
248
249
250 static inline int sta_info_buffer_expired(struct sk_buff *skb)
251 {
252 struct ieee80211_tx_packet_data *pkt_data;
253 if (!skb)
254 return 0;
255
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
258 * beacon interval */
259
260 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
261
262 if (pkt_data->magic != IEEE80211_CB_MAGIC)
263 return 1;
264
265 return time_after(jiffies, pkt_data->jiffies + STA_TX_BUFFER_EXPIRE);
266 }
267
268
269 static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
270 struct sta_info *sta)
271 {
272 unsigned long flags;
273 struct sk_buff *skb;
274
275 if (skb_queue_empty(&sta->ps_tx_buf))
276 return;
277
278 for (;;) {
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);
283 else
284 skb = NULL;
285 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
286
287 if (skb) {
288 local->total_ps_buffered--;
289 printk(KERN_DEBUG "Buffered frame expired (STA "
290 MACSTR ")\n", MAC2STR(sta->addr));
291 dev_kfree_skb(skb);
292 } else
293 break;
294 }
295 }
296
297
298 static void sta_info_cleanup(unsigned long data)
299 {
300 struct ieee80211_local *local = (struct ieee80211_local *) data;
301 struct list_head *ptr;
302
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);
310 ptr = ptr->next;
311 }
312 spin_unlock_bh(&local->sta_lock);
313
314 local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
315 add_timer(&local->sta_cleanup);
316 }
317
318
319 static void sta_info_proc_add_task(void *data)
320 {
321 struct ieee80211_local *local = data;
322 struct list_head *ptr;
323 struct sta_info *sta;
324 int max_adds = 100;
325
326 while (max_adds > 0) {
327 sta = NULL;
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);
333 break;
334 }
335 sta = NULL;
336 }
337 spin_unlock_bh(&local->sta_lock);
338
339 if (!sta)
340 break;
341
342 ieee80211_proc_init_sta(local, sta);
343 atomic_dec(&sta->users);
344
345 max_adds--;
346 }
347 }
348
349
350 void sta_info_init(struct ieee80211_local *local)
351 {
352 spin_lock_init(&local->sta_lock);
353 INIT_LIST_HEAD(&local->sta_list);
354
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;
359
360 INIT_WORK(&local->sta_proc_add, sta_info_proc_add_task, local);
361 }
362
363 void sta_info_start(struct ieee80211_local *local)
364 {
365 add_timer(&local->sta_cleanup);
366 }
367
368 void sta_info_stop(struct ieee80211_local *local)
369 {
370 struct list_head *ptr;
371
372 del_timer(&local->sta_cleanup);
373
374 ptr = local->sta_list.next;
375 while (ptr && ptr != &local->sta_list) {
376 struct sta_info *sta = (struct sta_info *) ptr;
377 ptr = ptr->next;
378 sta_info_free(local, sta, 0);
379 }
380 }
381
382
383 void sta_info_remove_aid_ptr(struct sta_info *sta)
384 {
385 struct ieee80211_sub_if_data *sdata;
386
387 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
388 if (sta->aid <= 0 || !sdata->bss)
389 return;
390
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--;
396 }
397 }
398
399
400 /**
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
404 */
405 void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
406 {
407 struct list_head *ptr, *n;
408
409 spin_lock_bh(&local->sta_lock);
410
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);
415 }
416 spin_unlock_bh(&local->sta_lock);
417 }
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