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Commit | Line | Data |
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f0706e82 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
4 | * | |
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. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
888d04df | 12 | #include <linux/etherdevice.h> |
f0706e82 JB |
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> | |
0d174406 | 18 | #include <linux/timer.h> |
d0709a65 | 19 | #include <linux/rtnetlink.h> |
f0706e82 JB |
20 | |
21 | #include <net/mac80211.h> | |
22 | #include "ieee80211_i.h" | |
24487981 | 23 | #include "driver-ops.h" |
2c8dccc7 | 24 | #include "rate.h" |
f0706e82 | 25 | #include "sta_info.h" |
e9f207f0 | 26 | #include "debugfs_sta.h" |
ee385855 | 27 | #include "mesh.h" |
ce662b44 | 28 | #include "wme.h" |
f0706e82 | 29 | |
d0709a65 JB |
30 | /** |
31 | * DOC: STA information lifetime rules | |
32 | * | |
33 | * STA info structures (&struct sta_info) are managed in a hash table | |
34 | * for faster lookup and a list for iteration. They are managed using | |
35 | * RCU, i.e. access to the list and hash table is protected by RCU. | |
36 | * | |
34e89507 JB |
37 | * Upon allocating a STA info structure with sta_info_alloc(), the caller |
38 | * owns that structure. It must then insert it into the hash table using | |
39 | * either sta_info_insert() or sta_info_insert_rcu(); only in the latter | |
40 | * case (which acquires an rcu read section but must not be called from | |
41 | * within one) will the pointer still be valid after the call. Note that | |
42 | * the caller may not do much with the STA info before inserting it, in | |
43 | * particular, it may not start any mesh peer link management or add | |
44 | * encryption keys. | |
93e5deb1 JB |
45 | * |
46 | * When the insertion fails (sta_info_insert()) returns non-zero), the | |
47 | * structure will have been freed by sta_info_insert()! | |
d0709a65 | 48 | * |
34e89507 | 49 | * Station entries are added by mac80211 when you establish a link with a |
7e189a12 LR |
50 | * peer. This means different things for the different type of interfaces |
51 | * we support. For a regular station this mean we add the AP sta when we | |
25985edc | 52 | * receive an association response from the AP. For IBSS this occurs when |
34e89507 | 53 | * get to know about a peer on the same IBSS. For WDS we add the sta for |
25985edc | 54 | * the peer immediately upon device open. When using AP mode we add stations |
34e89507 | 55 | * for each respective station upon request from userspace through nl80211. |
7e189a12 | 56 | * |
34e89507 JB |
57 | * In order to remove a STA info structure, various sta_info_destroy_*() |
58 | * calls are available. | |
d0709a65 | 59 | * |
34e89507 JB |
60 | * There is no concept of ownership on a STA entry, each structure is |
61 | * owned by the global hash table/list until it is removed. All users of | |
62 | * the structure need to be RCU protected so that the structure won't be | |
63 | * freed before they are done using it. | |
d0709a65 | 64 | */ |
f0706e82 | 65 | |
4d33960b | 66 | /* Caller must hold local->sta_mtx */ |
be8755e1 MW |
67 | static int sta_info_hash_del(struct ieee80211_local *local, |
68 | struct sta_info *sta) | |
f0706e82 JB |
69 | { |
70 | struct sta_info *s; | |
71 | ||
40b275b6 | 72 | s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)], |
4d33960b | 73 | lockdep_is_held(&local->sta_mtx)); |
f0706e82 | 74 | if (!s) |
be8755e1 MW |
75 | return -ENOENT; |
76 | if (s == sta) { | |
cf778b00 | 77 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], |
d0709a65 | 78 | s->hnext); |
be8755e1 | 79 | return 0; |
f0706e82 JB |
80 | } |
81 | ||
40b275b6 JB |
82 | while (rcu_access_pointer(s->hnext) && |
83 | rcu_access_pointer(s->hnext) != sta) | |
84 | s = rcu_dereference_protected(s->hnext, | |
4d33960b | 85 | lockdep_is_held(&local->sta_mtx)); |
40b275b6 | 86 | if (rcu_access_pointer(s->hnext)) { |
cf778b00 | 87 | rcu_assign_pointer(s->hnext, sta->hnext); |
be8755e1 MW |
88 | return 0; |
89 | } | |
f0706e82 | 90 | |
be8755e1 | 91 | return -ENOENT; |
f0706e82 JB |
92 | } |
93 | ||
d0709a65 | 94 | /* protected by RCU */ |
abe60632 JB |
95 | struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, |
96 | const u8 *addr) | |
f0706e82 | 97 | { |
abe60632 | 98 | struct ieee80211_local *local = sdata->local; |
f0706e82 JB |
99 | struct sta_info *sta; |
100 | ||
0379185b | 101 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
0379185b | 102 | lockdep_is_held(&local->sta_mtx)); |
f0706e82 | 103 | while (sta) { |
abe60632 | 104 | if (sta->sdata == sdata && |
888d04df | 105 | compare_ether_addr(sta->sta.addr, addr) == 0) |
f0706e82 | 106 | break; |
0379185b | 107 | sta = rcu_dereference_check(sta->hnext, |
0379185b | 108 | lockdep_is_held(&local->sta_mtx)); |
f0706e82 | 109 | } |
43ba7e95 JB |
110 | return sta; |
111 | } | |
112 | ||
0e5ded5a FF |
113 | /* |
114 | * Get sta info either from the specified interface | |
115 | * or from one of its vlans | |
116 | */ | |
117 | struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, | |
118 | const u8 *addr) | |
119 | { | |
120 | struct ieee80211_local *local = sdata->local; | |
121 | struct sta_info *sta; | |
122 | ||
0379185b | 123 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
0379185b | 124 | lockdep_is_held(&local->sta_mtx)); |
0e5ded5a FF |
125 | while (sta) { |
126 | if ((sta->sdata == sdata || | |
a2c1e3da | 127 | (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && |
888d04df | 128 | compare_ether_addr(sta->sta.addr, addr) == 0) |
0e5ded5a | 129 | break; |
0379185b | 130 | sta = rcu_dereference_check(sta->hnext, |
0379185b | 131 | lockdep_is_held(&local->sta_mtx)); |
0e5ded5a FF |
132 | } |
133 | return sta; | |
134 | } | |
135 | ||
3b53fde8 JB |
136 | struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, |
137 | int idx) | |
ee385855 | 138 | { |
3b53fde8 | 139 | struct ieee80211_local *local = sdata->local; |
ee385855 LCC |
140 | struct sta_info *sta; |
141 | int i = 0; | |
142 | ||
d0709a65 | 143 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
3b53fde8 | 144 | if (sdata != sta->sdata) |
2a8ca29a | 145 | continue; |
ee385855 LCC |
146 | if (i < idx) { |
147 | ++i; | |
148 | continue; | |
ee385855 | 149 | } |
2a8ca29a | 150 | return sta; |
ee385855 | 151 | } |
ee385855 LCC |
152 | |
153 | return NULL; | |
154 | } | |
f0706e82 | 155 | |
93e5deb1 | 156 | /** |
d9a7ddb0 | 157 | * sta_info_free - free STA |
93e5deb1 | 158 | * |
6ef307bc | 159 | * @local: pointer to the global information |
93e5deb1 JB |
160 | * @sta: STA info to free |
161 | * | |
162 | * This function must undo everything done by sta_info_alloc() | |
d9a7ddb0 JB |
163 | * that may happen before sta_info_insert(). It may only be |
164 | * called when sta_info_insert() has not been attempted (and | |
165 | * if that fails, the station is freed anyway.) | |
93e5deb1 | 166 | */ |
d9a7ddb0 | 167 | void sta_info_free(struct ieee80211_local *local, struct sta_info *sta) |
93e5deb1 | 168 | { |
889cbb91 | 169 | if (sta->rate_ctrl) |
af65cd96 | 170 | rate_control_free_sta(sta); |
93e5deb1 JB |
171 | |
172 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0fb9a9ec | 173 | wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr); |
93e5deb1 JB |
174 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
175 | ||
176 | kfree(sta); | |
177 | } | |
178 | ||
4d33960b | 179 | /* Caller must hold local->sta_mtx */ |
d0709a65 JB |
180 | static void sta_info_hash_add(struct ieee80211_local *local, |
181 | struct sta_info *sta) | |
f0706e82 | 182 | { |
4d33960b | 183 | lockdep_assert_held(&local->sta_mtx); |
17741cdc | 184 | sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; |
cf778b00 | 185 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); |
f0706e82 | 186 | } |
f0706e82 | 187 | |
af818581 JB |
188 | static void sta_unblock(struct work_struct *wk) |
189 | { | |
190 | struct sta_info *sta; | |
191 | ||
192 | sta = container_of(wk, struct sta_info, drv_unblock_wk); | |
193 | ||
194 | if (sta->dead) | |
195 | return; | |
196 | ||
54420473 HS |
197 | if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { |
198 | local_bh_disable(); | |
af818581 | 199 | ieee80211_sta_ps_deliver_wakeup(sta); |
54420473 HS |
200 | local_bh_enable(); |
201 | } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) { | |
c2c98fde | 202 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
ce662b44 JB |
203 | |
204 | local_bh_disable(); | |
af818581 | 205 | ieee80211_sta_ps_deliver_poll_response(sta); |
ce662b44 | 206 | local_bh_enable(); |
c2c98fde JB |
207 | } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) { |
208 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); | |
ce662b44 JB |
209 | |
210 | local_bh_disable(); | |
47086fc5 | 211 | ieee80211_sta_ps_deliver_uapsd(sta); |
ce662b44 | 212 | local_bh_enable(); |
50a9432d | 213 | } else |
c2c98fde | 214 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
af818581 JB |
215 | } |
216 | ||
af65cd96 JB |
217 | static int sta_prepare_rate_control(struct ieee80211_local *local, |
218 | struct sta_info *sta, gfp_t gfp) | |
219 | { | |
220 | if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) | |
221 | return 0; | |
222 | ||
889cbb91 | 223 | sta->rate_ctrl = local->rate_ctrl; |
af65cd96 JB |
224 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, |
225 | &sta->sta, gfp); | |
889cbb91 | 226 | if (!sta->rate_ctrl_priv) |
af65cd96 | 227 | return -ENOMEM; |
af65cd96 JB |
228 | |
229 | return 0; | |
230 | } | |
231 | ||
73651ee6 | 232 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
56544160 | 233 | const u8 *addr, gfp_t gfp) |
f0706e82 | 234 | { |
d0709a65 | 235 | struct ieee80211_local *local = sdata->local; |
f0706e82 | 236 | struct sta_info *sta; |
ebe27c91 | 237 | struct timespec uptime; |
16c5f15c | 238 | int i; |
f0706e82 | 239 | |
17741cdc | 240 | sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); |
f0706e82 | 241 | if (!sta) |
73651ee6 | 242 | return NULL; |
f0706e82 | 243 | |
07346f81 | 244 | spin_lock_init(&sta->lock); |
af818581 | 245 | INIT_WORK(&sta->drv_unblock_wk, sta_unblock); |
67c282c0 | 246 | INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); |
a93e3644 | 247 | mutex_init(&sta->ampdu_mlme.mtx); |
07346f81 | 248 | |
17741cdc | 249 | memcpy(sta->sta.addr, addr, ETH_ALEN); |
d0709a65 JB |
250 | sta->local = local; |
251 | sta->sdata = sdata; | |
8bc8aecd | 252 | sta->last_rx = jiffies; |
f0706e82 | 253 | |
71ec375c JB |
254 | sta->sta_state = IEEE80211_STA_NONE; |
255 | ||
ebe27c91 MSS |
256 | do_posix_clock_monotonic_gettime(&uptime); |
257 | sta->last_connected = uptime.tv_sec; | |
541a45a1 BR |
258 | ewma_init(&sta->avg_signal, 1024, 8); |
259 | ||
af65cd96 | 260 | if (sta_prepare_rate_control(local, sta, gfp)) { |
f0706e82 | 261 | kfree(sta); |
73651ee6 | 262 | return NULL; |
f0706e82 JB |
263 | } |
264 | ||
16c5f15c | 265 | for (i = 0; i < STA_TID_NUM; i++) { |
a622ab72 JB |
266 | /* |
267 | * timer_to_tid must be initialized with identity mapping | |
268 | * to enable session_timer's data differentiation. See | |
269 | * sta_rx_agg_session_timer_expired for usage. | |
270 | */ | |
16c5f15c | 271 | sta->timer_to_tid[i] = i; |
16c5f15c | 272 | } |
948d887d JB |
273 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { |
274 | skb_queue_head_init(&sta->ps_tx_buf[i]); | |
275 | skb_queue_head_init(&sta->tx_filtered[i]); | |
276 | } | |
73651ee6 | 277 | |
cccaec98 | 278 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) |
4be929be | 279 | sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); |
cccaec98 | 280 | |
73651ee6 | 281 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
0fb9a9ec | 282 | wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr); |
73651ee6 JB |
283 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
284 | ||
03e4497e | 285 | #ifdef CONFIG_MAC80211_MESH |
57cf8043 | 286 | sta->plink_state = NL80211_PLINK_LISTEN; |
03e4497e JB |
287 | init_timer(&sta->plink_timer); |
288 | #endif | |
289 | ||
73651ee6 JB |
290 | return sta; |
291 | } | |
292 | ||
8c71df7a | 293 | static int sta_info_insert_check(struct sta_info *sta) |
34e89507 | 294 | { |
34e89507 | 295 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
34e89507 | 296 | |
03e4497e JB |
297 | /* |
298 | * Can't be a WARN_ON because it can be triggered through a race: | |
299 | * something inserts a STA (on one CPU) without holding the RTNL | |
300 | * and another CPU turns off the net device. | |
301 | */ | |
8c71df7a GE |
302 | if (unlikely(!ieee80211_sdata_running(sdata))) |
303 | return -ENETDOWN; | |
03e4497e | 304 | |
47846c9b | 305 | if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 || |
8c71df7a GE |
306 | is_multicast_ether_addr(sta->sta.addr))) |
307 | return -EINVAL; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
f09603a2 JB |
312 | static int sta_info_insert_drv_state(struct ieee80211_local *local, |
313 | struct ieee80211_sub_if_data *sdata, | |
314 | struct sta_info *sta) | |
315 | { | |
316 | enum ieee80211_sta_state state; | |
317 | int err = 0; | |
318 | ||
319 | for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) { | |
320 | err = drv_sta_state(local, sdata, sta, state, state + 1); | |
321 | if (err) | |
322 | break; | |
323 | } | |
324 | ||
325 | if (!err) { | |
a4ec45a4 JB |
326 | /* |
327 | * Drivers using legacy sta_add/sta_remove callbacks only | |
328 | * get uploaded set to true after sta_add is called. | |
329 | */ | |
330 | if (!local->ops->sta_add) | |
331 | sta->uploaded = true; | |
f09603a2 JB |
332 | return 0; |
333 | } | |
334 | ||
335 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
336 | printk(KERN_DEBUG | |
337 | "%s: failed to move IBSS STA %pM to state %d (%d) - keeping it anyway.\n", | |
338 | sdata->name, sta->sta.addr, state + 1, err); | |
339 | err = 0; | |
340 | } | |
341 | ||
342 | /* unwind on error */ | |
343 | for (; state > IEEE80211_STA_NOTEXIST; state--) | |
344 | WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1)); | |
345 | ||
346 | return err; | |
347 | } | |
348 | ||
8c71df7a GE |
349 | /* |
350 | * should be called with sta_mtx locked | |
351 | * this function replaces the mutex lock | |
352 | * with a RCU lock | |
353 | */ | |
4d33960b | 354 | static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU) |
8c71df7a GE |
355 | { |
356 | struct ieee80211_local *local = sta->local; | |
357 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
7852e361 | 358 | struct station_info sinfo; |
8c71df7a GE |
359 | int err = 0; |
360 | ||
361 | lockdep_assert_held(&local->sta_mtx); | |
34e89507 | 362 | |
7852e361 JB |
363 | /* check if STA exists already */ |
364 | if (sta_info_get_bss(sdata, sta->sta.addr)) { | |
365 | err = -EEXIST; | |
366 | goto out_err; | |
4d33960b | 367 | } |
32bfd35d | 368 | |
7852e361 JB |
369 | /* notify driver */ |
370 | err = sta_info_insert_drv_state(local, sdata, sta); | |
371 | if (err) | |
372 | goto out_err; | |
4d33960b | 373 | |
7852e361 JB |
374 | local->num_sta++; |
375 | local->sta_generation++; | |
376 | smp_mb(); | |
4d33960b | 377 | |
7852e361 JB |
378 | /* make the station visible */ |
379 | sta_info_hash_add(local, sta); | |
83d5cc01 | 380 | |
7852e361 | 381 | list_add(&sta->list, &local->sta_list); |
4d33960b | 382 | |
7852e361 | 383 | set_sta_flag(sta, WLAN_STA_INSERTED); |
4d33960b | 384 | |
7852e361 JB |
385 | ieee80211_sta_debugfs_add(sta); |
386 | rate_control_add_sta_debugfs(sta); | |
4d33960b | 387 | |
7852e361 JB |
388 | memset(&sinfo, 0, sizeof(sinfo)); |
389 | sinfo.filled = 0; | |
390 | sinfo.generation = local->sta_generation; | |
391 | cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); | |
d0709a65 | 392 | |
f0706e82 | 393 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
7852e361 | 394 | wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr); |
f0706e82 JB |
395 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
396 | ||
34e89507 JB |
397 | /* move reference to rcu-protected */ |
398 | rcu_read_lock(); | |
399 | mutex_unlock(&local->sta_mtx); | |
e9f207f0 | 400 | |
73651ee6 JB |
401 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
402 | mesh_accept_plinks_update(sdata); | |
403 | ||
8c71df7a | 404 | return 0; |
4d33960b JB |
405 | out_err: |
406 | mutex_unlock(&local->sta_mtx); | |
407 | rcu_read_lock(); | |
408 | return err; | |
8c71df7a GE |
409 | } |
410 | ||
411 | int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) | |
412 | { | |
413 | struct ieee80211_local *local = sta->local; | |
8c71df7a GE |
414 | int err = 0; |
415 | ||
4d33960b JB |
416 | might_sleep(); |
417 | ||
8c71df7a GE |
418 | err = sta_info_insert_check(sta); |
419 | if (err) { | |
420 | rcu_read_lock(); | |
421 | goto out_free; | |
422 | } | |
423 | ||
8c71df7a GE |
424 | mutex_lock(&local->sta_mtx); |
425 | ||
4d33960b | 426 | err = sta_info_insert_finish(sta); |
8c71df7a GE |
427 | if (err) |
428 | goto out_free; | |
429 | ||
73651ee6 | 430 | return 0; |
93e5deb1 JB |
431 | out_free: |
432 | BUG_ON(!err); | |
d9a7ddb0 | 433 | sta_info_free(local, sta); |
93e5deb1 | 434 | return err; |
f0706e82 JB |
435 | } |
436 | ||
34e89507 JB |
437 | int sta_info_insert(struct sta_info *sta) |
438 | { | |
439 | int err = sta_info_insert_rcu(sta); | |
440 | ||
441 | rcu_read_unlock(); | |
442 | ||
443 | return err; | |
444 | } | |
445 | ||
004c872e JB |
446 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
447 | { | |
448 | /* | |
449 | * This format has been mandated by the IEEE specifications, | |
450 | * so this line may not be changed to use the __set_bit() format. | |
451 | */ | |
452 | bss->tim[aid / 8] |= (1 << (aid % 8)); | |
453 | } | |
454 | ||
455 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) | |
456 | { | |
457 | /* | |
458 | * This format has been mandated by the IEEE specifications, | |
459 | * so this line may not be changed to use the __clear_bit() format. | |
460 | */ | |
461 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); | |
462 | } | |
463 | ||
948d887d | 464 | static unsigned long ieee80211_tids_for_ac(int ac) |
004c872e | 465 | { |
948d887d JB |
466 | /* If we ever support TIDs > 7, this obviously needs to be adjusted */ |
467 | switch (ac) { | |
468 | case IEEE80211_AC_VO: | |
469 | return BIT(6) | BIT(7); | |
470 | case IEEE80211_AC_VI: | |
471 | return BIT(4) | BIT(5); | |
472 | case IEEE80211_AC_BE: | |
473 | return BIT(0) | BIT(3); | |
474 | case IEEE80211_AC_BK: | |
475 | return BIT(1) | BIT(2); | |
476 | default: | |
477 | WARN_ON(1); | |
478 | return 0; | |
d0709a65 | 479 | } |
004c872e JB |
480 | } |
481 | ||
c868cb35 | 482 | void sta_info_recalc_tim(struct sta_info *sta) |
004c872e | 483 | { |
c868cb35 JB |
484 | struct ieee80211_local *local = sta->local; |
485 | struct ieee80211_if_ap *bss = sta->sdata->bss; | |
d0709a65 | 486 | unsigned long flags; |
948d887d JB |
487 | bool indicate_tim = false; |
488 | u8 ignore_for_tim = sta->sta.uapsd_queues; | |
489 | int ac; | |
004c872e | 490 | |
c868cb35 JB |
491 | if (WARN_ON_ONCE(!sta->sdata->bss)) |
492 | return; | |
3e122be0 | 493 | |
c868cb35 JB |
494 | /* No need to do anything if the driver does all */ |
495 | if (local->hw.flags & IEEE80211_HW_AP_LINK_PS) | |
496 | return; | |
004c872e | 497 | |
c868cb35 JB |
498 | if (sta->dead) |
499 | goto done; | |
3e122be0 | 500 | |
948d887d JB |
501 | /* |
502 | * If all ACs are delivery-enabled then we should build | |
503 | * the TIM bit for all ACs anyway; if only some are then | |
504 | * we ignore those and build the TIM bit using only the | |
505 | * non-enabled ones. | |
506 | */ | |
507 | if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1) | |
508 | ignore_for_tim = 0; | |
509 | ||
510 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { | |
511 | unsigned long tids; | |
3e122be0 | 512 | |
948d887d JB |
513 | if (ignore_for_tim & BIT(ac)) |
514 | continue; | |
515 | ||
516 | indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) || | |
517 | !skb_queue_empty(&sta->ps_tx_buf[ac]); | |
518 | if (indicate_tim) | |
519 | break; | |
3e122be0 | 520 | |
948d887d JB |
521 | tids = ieee80211_tids_for_ac(ac); |
522 | ||
523 | indicate_tim |= | |
524 | sta->driver_buffered_tids & tids; | |
d0709a65 | 525 | } |
004c872e | 526 | |
c868cb35 | 527 | done: |
4d33960b | 528 | spin_lock_irqsave(&local->tim_lock, flags); |
004c872e | 529 | |
948d887d | 530 | if (indicate_tim) |
c868cb35 JB |
531 | __bss_tim_set(bss, sta->sta.aid); |
532 | else | |
533 | __bss_tim_clear(bss, sta->sta.aid); | |
004c872e | 534 | |
c868cb35 JB |
535 | if (local->ops->set_tim) { |
536 | local->tim_in_locked_section = true; | |
948d887d | 537 | drv_set_tim(local, &sta->sta, indicate_tim); |
c868cb35 JB |
538 | local->tim_in_locked_section = false; |
539 | } | |
3e122be0 | 540 | |
4d33960b | 541 | spin_unlock_irqrestore(&local->tim_lock, flags); |
004c872e JB |
542 | } |
543 | ||
cd0b8d89 | 544 | static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb) |
f0706e82 | 545 | { |
e039fa4a | 546 | struct ieee80211_tx_info *info; |
f0706e82 JB |
547 | int timeout; |
548 | ||
549 | if (!skb) | |
cd0b8d89 | 550 | return false; |
f0706e82 | 551 | |
e039fa4a | 552 | info = IEEE80211_SKB_CB(skb); |
f0706e82 JB |
553 | |
554 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ | |
57c4d7b4 JB |
555 | timeout = (sta->listen_interval * |
556 | sta->sdata->vif.bss_conf.beacon_int * | |
557 | 32 / 15625) * HZ; | |
f0706e82 JB |
558 | if (timeout < STA_TX_BUFFER_EXPIRE) |
559 | timeout = STA_TX_BUFFER_EXPIRE; | |
e039fa4a | 560 | return time_after(jiffies, info->control.jiffies + timeout); |
f0706e82 JB |
561 | } |
562 | ||
563 | ||
948d887d JB |
564 | static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local, |
565 | struct sta_info *sta, int ac) | |
f0706e82 JB |
566 | { |
567 | unsigned long flags; | |
568 | struct sk_buff *skb; | |
569 | ||
60750397 JB |
570 | /* |
571 | * First check for frames that should expire on the filtered | |
572 | * queue. Frames here were rejected by the driver and are on | |
573 | * a separate queue to avoid reordering with normal PS-buffered | |
574 | * frames. They also aren't accounted for right now in the | |
575 | * total_ps_buffered counter. | |
576 | */ | |
577 | for (;;) { | |
948d887d JB |
578 | spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); |
579 | skb = skb_peek(&sta->tx_filtered[ac]); | |
60750397 | 580 | if (sta_info_buffer_expired(sta, skb)) |
948d887d | 581 | skb = __skb_dequeue(&sta->tx_filtered[ac]); |
60750397 JB |
582 | else |
583 | skb = NULL; | |
948d887d | 584 | spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); |
60750397 JB |
585 | |
586 | /* | |
587 | * Frames are queued in order, so if this one | |
588 | * hasn't expired yet we can stop testing. If | |
589 | * we actually reached the end of the queue we | |
590 | * also need to stop, of course. | |
591 | */ | |
592 | if (!skb) | |
593 | break; | |
594 | dev_kfree_skb(skb); | |
595 | } | |
596 | ||
597 | /* | |
598 | * Now also check the normal PS-buffered queue, this will | |
599 | * only find something if the filtered queue was emptied | |
600 | * since the filtered frames are all before the normal PS | |
601 | * buffered frames. | |
602 | */ | |
f0706e82 | 603 | for (;;) { |
948d887d JB |
604 | spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); |
605 | skb = skb_peek(&sta->ps_tx_buf[ac]); | |
57c4d7b4 | 606 | if (sta_info_buffer_expired(sta, skb)) |
948d887d | 607 | skb = __skb_dequeue(&sta->ps_tx_buf[ac]); |
836341a7 | 608 | else |
f0706e82 | 609 | skb = NULL; |
948d887d | 610 | spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); |
f0706e82 | 611 | |
60750397 JB |
612 | /* |
613 | * frames are queued in order, so if this one | |
614 | * hasn't expired yet (or we reached the end of | |
615 | * the queue) we can stop testing | |
616 | */ | |
836341a7 | 617 | if (!skb) |
f0706e82 | 618 | break; |
836341a7 | 619 | |
836341a7 | 620 | local->total_ps_buffered--; |
f4ea83dd | 621 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
622 | printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n", |
623 | sta->sta.addr); | |
f4ea83dd | 624 | #endif |
836341a7 | 625 | dev_kfree_skb(skb); |
f0706e82 | 626 | } |
3393a608 | 627 | |
60750397 JB |
628 | /* |
629 | * Finally, recalculate the TIM bit for this station -- it might | |
630 | * now be clear because the station was too slow to retrieve its | |
631 | * frames. | |
632 | */ | |
633 | sta_info_recalc_tim(sta); | |
634 | ||
635 | /* | |
636 | * Return whether there are any frames still buffered, this is | |
637 | * used to check whether the cleanup timer still needs to run, | |
638 | * if there are no frames we don't need to rearm the timer. | |
639 | */ | |
948d887d JB |
640 | return !(skb_queue_empty(&sta->ps_tx_buf[ac]) && |
641 | skb_queue_empty(&sta->tx_filtered[ac])); | |
642 | } | |
643 | ||
644 | static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, | |
645 | struct sta_info *sta) | |
646 | { | |
647 | bool have_buffered = false; | |
648 | int ac; | |
649 | ||
650 | /* This is only necessary for stations on BSS interfaces */ | |
651 | if (!sta->sdata->bss) | |
652 | return false; | |
653 | ||
654 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) | |
655 | have_buffered |= | |
656 | sta_info_cleanup_expire_buffered_ac(local, sta, ac); | |
657 | ||
658 | return have_buffered; | |
f0706e82 JB |
659 | } |
660 | ||
83d5cc01 | 661 | int __must_check __sta_info_destroy(struct sta_info *sta) |
f0706e82 | 662 | { |
34e89507 JB |
663 | struct ieee80211_local *local; |
664 | struct ieee80211_sub_if_data *sdata; | |
948d887d | 665 | int ret, i, ac; |
42624d49 | 666 | struct tid_ampdu_tx *tid_tx; |
f0706e82 | 667 | |
34e89507 | 668 | might_sleep(); |
f0706e82 | 669 | |
34e89507 JB |
670 | if (!sta) |
671 | return -ENOENT; | |
5bb644a0 | 672 | |
34e89507 JB |
673 | local = sta->local; |
674 | sdata = sta->sdata; | |
f0706e82 | 675 | |
83d5cc01 JB |
676 | lockdep_assert_held(&local->sta_mtx); |
677 | ||
098a6070 JB |
678 | /* |
679 | * Before removing the station from the driver and | |
680 | * rate control, it might still start new aggregation | |
681 | * sessions -- block that to make sure the tear-down | |
682 | * will be sufficient. | |
683 | */ | |
c2c98fde | 684 | set_sta_flag(sta, WLAN_STA_BLOCK_BA); |
53f73c09 | 685 | ieee80211_sta_tear_down_BA_sessions(sta, true); |
098a6070 | 686 | |
34e89507 | 687 | ret = sta_info_hash_del(local, sta); |
34e89507 JB |
688 | if (ret) |
689 | return ret; | |
690 | ||
4d33960b JB |
691 | list_del(&sta->list); |
692 | ||
8cb23153 | 693 | mutex_lock(&local->key_mtx); |
e31b8213 | 694 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) |
40b275b6 | 695 | __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i])); |
e31b8213 | 696 | if (sta->ptk) |
40b275b6 | 697 | __ieee80211_key_free(key_mtx_dereference(local, sta->ptk)); |
8cb23153 | 698 | mutex_unlock(&local->key_mtx); |
34e89507 JB |
699 | |
700 | sta->dead = true; | |
701 | ||
34e89507 JB |
702 | local->num_sta--; |
703 | local->sta_generation++; | |
704 | ||
705 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
a9b3cd7f | 706 | RCU_INIT_POINTER(sdata->u.vlan.sta, NULL); |
34e89507 | 707 | |
83d5cc01 | 708 | while (sta->sta_state > IEEE80211_STA_NONE) { |
f09603a2 JB |
709 | ret = sta_info_move_state(sta, sta->sta_state - 1); |
710 | if (ret) { | |
83d5cc01 JB |
711 | WARN_ON_ONCE(1); |
712 | break; | |
713 | } | |
714 | } | |
d9a7ddb0 | 715 | |
f09603a2 | 716 | if (sta->uploaded) { |
f09603a2 JB |
717 | ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE, |
718 | IEEE80211_STA_NOTEXIST); | |
719 | WARN_ON_ONCE(ret != 0); | |
720 | } | |
34e89507 | 721 | |
e64b3795 JB |
722 | /* |
723 | * At this point, after we wait for an RCU grace period, | |
724 | * neither mac80211 nor the driver can reference this | |
725 | * sta struct any more except by still existing timers | |
726 | * associated with this station that we clean up below. | |
727 | */ | |
728 | synchronize_rcu(); | |
729 | ||
4f3eb0ba HS |
730 | if (test_sta_flag(sta, WLAN_STA_PS_STA)) { |
731 | BUG_ON(!sdata->bss); | |
732 | ||
733 | clear_sta_flag(sta, WLAN_STA_PS_STA); | |
734 | ||
735 | atomic_dec(&sdata->bss->num_sta_ps); | |
736 | sta_info_recalc_tim(sta); | |
737 | } | |
738 | ||
948d887d JB |
739 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
740 | local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]); | |
741 | __skb_queue_purge(&sta->ps_tx_buf[ac]); | |
742 | __skb_queue_purge(&sta->tx_filtered[ac]); | |
743 | } | |
c868cb35 | 744 | |
34e89507 | 745 | #ifdef CONFIG_MAC80211_MESH |
e64b3795 | 746 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
34e89507 | 747 | mesh_accept_plinks_update(sdata); |
34e89507 JB |
748 | #endif |
749 | ||
750 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0fb9a9ec | 751 | wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr); |
34e89507 JB |
752 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
753 | cancel_work_sync(&sta->drv_unblock_wk); | |
754 | ||
ec15e68b JM |
755 | cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL); |
756 | ||
34e89507 JB |
757 | rate_control_remove_sta_debugfs(sta); |
758 | ieee80211_sta_debugfs_remove(sta); | |
759 | ||
760 | #ifdef CONFIG_MAC80211_MESH | |
761 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) { | |
762 | mesh_plink_deactivate(sta); | |
763 | del_timer_sync(&sta->plink_timer); | |
764 | } | |
765 | #endif | |
766 | ||
151a02f6 JB |
767 | /* |
768 | * Destroy aggregation state here. It would be nice to wait for the | |
769 | * driver to finish aggregation stop and then clean up, but for now | |
770 | * drivers have to handle aggregation stop being requested, followed | |
771 | * directly by station destruction. | |
42624d49 YAP |
772 | */ |
773 | for (i = 0; i < STA_TID_NUM; i++) { | |
151a02f6 | 774 | tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]); |
27bf8882 | 775 | if (!tid_tx) |
42624d49 | 776 | continue; |
151a02f6 JB |
777 | __skb_queue_purge(&tid_tx->pending); |
778 | kfree(tid_tx); | |
42624d49 YAP |
779 | } |
780 | ||
d9a7ddb0 | 781 | sta_info_free(local, sta); |
34e89507 JB |
782 | |
783 | return 0; | |
4d6141c3 JS |
784 | } |
785 | ||
34e89507 | 786 | int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) |
4d6141c3 | 787 | { |
34e89507 JB |
788 | struct sta_info *sta; |
789 | int ret; | |
4d6141c3 | 790 | |
34e89507 | 791 | mutex_lock(&sdata->local->sta_mtx); |
7852e361 | 792 | sta = sta_info_get(sdata, addr); |
34e89507 JB |
793 | ret = __sta_info_destroy(sta); |
794 | mutex_unlock(&sdata->local->sta_mtx); | |
4d6141c3 JS |
795 | |
796 | return ret; | |
797 | } | |
798 | ||
34e89507 JB |
799 | int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, |
800 | const u8 *addr) | |
e9f207f0 | 801 | { |
34e89507 JB |
802 | struct sta_info *sta; |
803 | int ret; | |
e9f207f0 | 804 | |
34e89507 | 805 | mutex_lock(&sdata->local->sta_mtx); |
7852e361 | 806 | sta = sta_info_get_bss(sdata, addr); |
34e89507 JB |
807 | ret = __sta_info_destroy(sta); |
808 | mutex_unlock(&sdata->local->sta_mtx); | |
d0709a65 | 809 | |
34e89507 JB |
810 | return ret; |
811 | } | |
e9f207f0 | 812 | |
34e89507 JB |
813 | static void sta_info_cleanup(unsigned long data) |
814 | { | |
815 | struct ieee80211_local *local = (struct ieee80211_local *) data; | |
816 | struct sta_info *sta; | |
3393a608 | 817 | bool timer_needed = false; |
34e89507 JB |
818 | |
819 | rcu_read_lock(); | |
820 | list_for_each_entry_rcu(sta, &local->sta_list, list) | |
3393a608 JO |
821 | if (sta_info_cleanup_expire_buffered(local, sta)) |
822 | timer_needed = true; | |
34e89507 | 823 | rcu_read_unlock(); |
e9f207f0 | 824 | |
34e89507 JB |
825 | if (local->quiescing) |
826 | return; | |
d0709a65 | 827 | |
3393a608 JO |
828 | if (!timer_needed) |
829 | return; | |
830 | ||
26d59535 JB |
831 | mod_timer(&local->sta_cleanup, |
832 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); | |
e9f207f0 | 833 | } |
e9f207f0 | 834 | |
f0706e82 JB |
835 | void sta_info_init(struct ieee80211_local *local) |
836 | { | |
4d33960b | 837 | spin_lock_init(&local->tim_lock); |
34e89507 | 838 | mutex_init(&local->sta_mtx); |
f0706e82 | 839 | INIT_LIST_HEAD(&local->sta_list); |
f0706e82 | 840 | |
b24b8a24 PE |
841 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
842 | (unsigned long)local); | |
f0706e82 JB |
843 | } |
844 | ||
845 | void sta_info_stop(struct ieee80211_local *local) | |
846 | { | |
f0706e82 | 847 | del_timer(&local->sta_cleanup); |
be8755e1 | 848 | sta_info_flush(local, NULL); |
f0706e82 JB |
849 | } |
850 | ||
f0706e82 JB |
851 | /** |
852 | * sta_info_flush - flush matching STA entries from the STA table | |
44213b5e JB |
853 | * |
854 | * Returns the number of removed STA entries. | |
855 | * | |
f0706e82 | 856 | * @local: local interface data |
d0709a65 | 857 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
f0706e82 | 858 | */ |
44213b5e | 859 | int sta_info_flush(struct ieee80211_local *local, |
af8cdcd8 | 860 | struct ieee80211_sub_if_data *sdata) |
f0706e82 JB |
861 | { |
862 | struct sta_info *sta, *tmp; | |
44213b5e | 863 | int ret = 0; |
f0706e82 | 864 | |
d0709a65 | 865 | might_sleep(); |
be8755e1 | 866 | |
34e89507 | 867 | mutex_lock(&local->sta_mtx); |
d0709a65 | 868 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
34316837 | 869 | if (!sdata || sdata == sta->sdata) { |
34e89507 | 870 | WARN_ON(__sta_info_destroy(sta)); |
34316837 JB |
871 | ret++; |
872 | } | |
be8755e1 | 873 | } |
34e89507 | 874 | mutex_unlock(&local->sta_mtx); |
44213b5e JB |
875 | |
876 | return ret; | |
f0706e82 | 877 | } |
dc6676b7 | 878 | |
24723d1b JB |
879 | void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, |
880 | unsigned long exp_time) | |
881 | { | |
882 | struct ieee80211_local *local = sdata->local; | |
883 | struct sta_info *sta, *tmp; | |
24723d1b | 884 | |
34e89507 | 885 | mutex_lock(&local->sta_mtx); |
e46a2cf9 MSS |
886 | |
887 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
ec2b774e ML |
888 | if (sdata != sta->sdata) |
889 | continue; | |
890 | ||
24723d1b JB |
891 | if (time_after(jiffies, sta->last_rx + exp_time)) { |
892 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
0c68ae26 | 893 | printk(KERN_DEBUG "%s: expiring inactive STA %pM\n", |
47846c9b | 894 | sdata->name, sta->sta.addr); |
24723d1b | 895 | #endif |
34e89507 | 896 | WARN_ON(__sta_info_destroy(sta)); |
24723d1b | 897 | } |
e46a2cf9 MSS |
898 | } |
899 | ||
34e89507 | 900 | mutex_unlock(&local->sta_mtx); |
24723d1b | 901 | } |
17741cdc | 902 | |
686b9cb9 BG |
903 | struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, |
904 | const u8 *addr, | |
905 | const u8 *localaddr) | |
17741cdc | 906 | { |
abe60632 | 907 | struct sta_info *sta, *nxt; |
17741cdc | 908 | |
686b9cb9 BG |
909 | /* |
910 | * Just return a random station if localaddr is NULL | |
911 | * ... first in list. | |
912 | */ | |
f7c65594 | 913 | for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { |
686b9cb9 BG |
914 | if (localaddr && |
915 | compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0) | |
916 | continue; | |
f7c65594 JB |
917 | if (!sta->uploaded) |
918 | return NULL; | |
abe60632 | 919 | return &sta->sta; |
f7c65594 JB |
920 | } |
921 | ||
abe60632 | 922 | return NULL; |
17741cdc | 923 | } |
686b9cb9 | 924 | EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); |
5ed176e1 JB |
925 | |
926 | struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, | |
927 | const u8 *addr) | |
928 | { | |
f7c65594 | 929 | struct sta_info *sta; |
5ed176e1 JB |
930 | |
931 | if (!vif) | |
932 | return NULL; | |
933 | ||
f7c65594 JB |
934 | sta = sta_info_get_bss(vif_to_sdata(vif), addr); |
935 | if (!sta) | |
936 | return NULL; | |
937 | ||
938 | if (!sta->uploaded) | |
939 | return NULL; | |
5ed176e1 | 940 | |
f7c65594 | 941 | return &sta->sta; |
5ed176e1 | 942 | } |
17741cdc | 943 | EXPORT_SYMBOL(ieee80211_find_sta); |
af818581 | 944 | |
50a9432d JB |
945 | static void clear_sta_ps_flags(void *_sta) |
946 | { | |
947 | struct sta_info *sta = _sta; | |
608383bf | 948 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
50a9432d | 949 | |
c2c98fde | 950 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
608383bf HS |
951 | if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA)) |
952 | atomic_dec(&sdata->bss->num_sta_ps); | |
50a9432d JB |
953 | } |
954 | ||
af818581 JB |
955 | /* powersave support code */ |
956 | void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) | |
957 | { | |
958 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
959 | struct ieee80211_local *local = sdata->local; | |
948d887d JB |
960 | struct sk_buff_head pending; |
961 | int filtered = 0, buffered = 0, ac; | |
962 | ||
c2c98fde | 963 | clear_sta_flag(sta, WLAN_STA_SP); |
47086fc5 | 964 | |
948d887d JB |
965 | BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1); |
966 | sta->driver_buffered_tids = 0; | |
af818581 | 967 | |
d057e5a3 AN |
968 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) |
969 | drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); | |
af818581 | 970 | |
948d887d | 971 | skb_queue_head_init(&pending); |
af818581 JB |
972 | |
973 | /* Send all buffered frames to the station */ | |
948d887d JB |
974 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
975 | int count = skb_queue_len(&pending), tmp; | |
976 | ||
977 | skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending); | |
978 | tmp = skb_queue_len(&pending); | |
979 | filtered += tmp - count; | |
980 | count = tmp; | |
981 | ||
982 | skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending); | |
983 | tmp = skb_queue_len(&pending); | |
984 | buffered += tmp - count; | |
985 | } | |
986 | ||
987 | ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta); | |
988 | ||
af818581 JB |
989 | local->total_ps_buffered -= buffered; |
990 | ||
c868cb35 JB |
991 | sta_info_recalc_tim(sta); |
992 | ||
af818581 JB |
993 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
994 | printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " | |
47846c9b | 995 | "since STA not sleeping anymore\n", sdata->name, |
948d887d | 996 | sta->sta.addr, sta->sta.aid, filtered, buffered); |
af818581 JB |
997 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
998 | } | |
999 | ||
ce662b44 JB |
1000 | static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata, |
1001 | struct sta_info *sta, int tid, | |
40b96408 | 1002 | enum ieee80211_frame_release_type reason) |
af818581 | 1003 | { |
af818581 | 1004 | struct ieee80211_local *local = sdata->local; |
ce662b44 | 1005 | struct ieee80211_qos_hdr *nullfunc; |
af818581 | 1006 | struct sk_buff *skb; |
ce662b44 JB |
1007 | int size = sizeof(*nullfunc); |
1008 | __le16 fc; | |
c2c98fde | 1009 | bool qos = test_sta_flag(sta, WLAN_STA_WME); |
ce662b44 | 1010 | struct ieee80211_tx_info *info; |
af818581 | 1011 | |
ce662b44 JB |
1012 | if (qos) { |
1013 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | | |
1014 | IEEE80211_STYPE_QOS_NULLFUNC | | |
1015 | IEEE80211_FCTL_FROMDS); | |
1016 | } else { | |
1017 | size -= 2; | |
1018 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | | |
1019 | IEEE80211_STYPE_NULLFUNC | | |
1020 | IEEE80211_FCTL_FROMDS); | |
af818581 | 1021 | } |
af818581 | 1022 | |
ce662b44 JB |
1023 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + size); |
1024 | if (!skb) | |
1025 | return; | |
1026 | ||
1027 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1028 | ||
1029 | nullfunc = (void *) skb_put(skb, size); | |
1030 | nullfunc->frame_control = fc; | |
1031 | nullfunc->duration_id = 0; | |
1032 | memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); | |
1033 | memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); | |
1034 | memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN); | |
1035 | ||
59b66255 JB |
1036 | skb->priority = tid; |
1037 | skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); | |
ce662b44 | 1038 | if (qos) { |
ce662b44 JB |
1039 | nullfunc->qos_ctrl = cpu_to_le16(tid); |
1040 | ||
40b96408 | 1041 | if (reason == IEEE80211_FRAME_RELEASE_UAPSD) |
ce662b44 JB |
1042 | nullfunc->qos_ctrl |= |
1043 | cpu_to_le16(IEEE80211_QOS_CTL_EOSP); | |
1044 | } | |
1045 | ||
1046 | info = IEEE80211_SKB_CB(skb); | |
1047 | ||
1048 | /* | |
1049 | * Tell TX path to send this frame even though the | |
1050 | * STA may still remain is PS mode after this frame | |
deeaee19 JB |
1051 | * exchange. Also set EOSP to indicate this packet |
1052 | * ends the poll/service period. | |
ce662b44 | 1053 | */ |
02f2f1a9 | 1054 | info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | |
deeaee19 JB |
1055 | IEEE80211_TX_STATUS_EOSP | |
1056 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
ce662b44 | 1057 | |
40b96408 JB |
1058 | drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false); |
1059 | ||
ce662b44 JB |
1060 | ieee80211_xmit(sdata, skb); |
1061 | } | |
1062 | ||
47086fc5 JB |
1063 | static void |
1064 | ieee80211_sta_ps_deliver_response(struct sta_info *sta, | |
1065 | int n_frames, u8 ignored_acs, | |
1066 | enum ieee80211_frame_release_type reason) | |
af818581 JB |
1067 | { |
1068 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
1069 | struct ieee80211_local *local = sdata->local; | |
4049e09a | 1070 | bool found = false; |
948d887d JB |
1071 | bool more_data = false; |
1072 | int ac; | |
4049e09a | 1073 | unsigned long driver_release_tids = 0; |
47086fc5 | 1074 | struct sk_buff_head frames; |
af818581 | 1075 | |
deeaee19 | 1076 | /* Service or PS-Poll period starts */ |
c2c98fde | 1077 | set_sta_flag(sta, WLAN_STA_SP); |
deeaee19 | 1078 | |
47086fc5 | 1079 | __skb_queue_head_init(&frames); |
948d887d JB |
1080 | |
1081 | /* | |
47086fc5 | 1082 | * Get response frame(s) and more data bit for it. |
948d887d JB |
1083 | */ |
1084 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { | |
4049e09a JB |
1085 | unsigned long tids; |
1086 | ||
47086fc5 | 1087 | if (ignored_acs & BIT(ac)) |
948d887d JB |
1088 | continue; |
1089 | ||
4049e09a JB |
1090 | tids = ieee80211_tids_for_ac(ac); |
1091 | ||
1092 | if (!found) { | |
1093 | driver_release_tids = sta->driver_buffered_tids & tids; | |
1094 | if (driver_release_tids) { | |
1095 | found = true; | |
1096 | } else { | |
47086fc5 JB |
1097 | struct sk_buff *skb; |
1098 | ||
1099 | while (n_frames > 0) { | |
1100 | skb = skb_dequeue(&sta->tx_filtered[ac]); | |
1101 | if (!skb) { | |
1102 | skb = skb_dequeue( | |
1103 | &sta->ps_tx_buf[ac]); | |
1104 | if (skb) | |
1105 | local->total_ps_buffered--; | |
1106 | } | |
1107 | if (!skb) | |
1108 | break; | |
1109 | n_frames--; | |
4049e09a | 1110 | found = true; |
47086fc5 JB |
1111 | __skb_queue_tail(&frames, skb); |
1112 | } | |
948d887d | 1113 | } |
948d887d | 1114 | |
4049e09a JB |
1115 | /* |
1116 | * If the driver has data on more than one TID then | |
1117 | * certainly there's more data if we release just a | |
1118 | * single frame now (from a single TID). | |
1119 | */ | |
47086fc5 JB |
1120 | if (reason == IEEE80211_FRAME_RELEASE_PSPOLL && |
1121 | hweight16(driver_release_tids) > 1) { | |
4049e09a JB |
1122 | more_data = true; |
1123 | driver_release_tids = | |
1124 | BIT(ffs(driver_release_tids) - 1); | |
1125 | break; | |
1126 | } | |
1127 | } | |
948d887d JB |
1128 | |
1129 | if (!skb_queue_empty(&sta->tx_filtered[ac]) || | |
1130 | !skb_queue_empty(&sta->ps_tx_buf[ac])) { | |
1131 | more_data = true; | |
1132 | break; | |
1133 | } | |
af818581 | 1134 | } |
af818581 | 1135 | |
4049e09a | 1136 | if (!found) { |
ce662b44 | 1137 | int tid; |
af818581 JB |
1138 | |
1139 | /* | |
ce662b44 JB |
1140 | * For PS-Poll, this can only happen due to a race condition |
1141 | * when we set the TIM bit and the station notices it, but | |
1142 | * before it can poll for the frame we expire it. | |
1143 | * | |
1144 | * For uAPSD, this is said in the standard (11.2.1.5 h): | |
1145 | * At each unscheduled SP for a non-AP STA, the AP shall | |
1146 | * attempt to transmit at least one MSDU or MMPDU, but no | |
1147 | * more than the value specified in the Max SP Length field | |
1148 | * in the QoS Capability element from delivery-enabled ACs, | |
1149 | * that are destined for the non-AP STA. | |
1150 | * | |
1151 | * Since we have no other MSDU/MMPDU, transmit a QoS null frame. | |
af818581 | 1152 | */ |
af818581 | 1153 | |
ce662b44 JB |
1154 | /* This will evaluate to 1, 3, 5 or 7. */ |
1155 | tid = 7 - ((ffs(~ignored_acs) - 1) << 1); | |
af818581 | 1156 | |
40b96408 | 1157 | ieee80211_send_null_response(sdata, sta, tid, reason); |
4049e09a JB |
1158 | return; |
1159 | } | |
af818581 | 1160 | |
47086fc5 JB |
1161 | if (!driver_release_tids) { |
1162 | struct sk_buff_head pending; | |
1163 | struct sk_buff *skb; | |
40b96408 JB |
1164 | int num = 0; |
1165 | u16 tids = 0; | |
af818581 | 1166 | |
47086fc5 | 1167 | skb_queue_head_init(&pending); |
af818581 | 1168 | |
47086fc5 JB |
1169 | while ((skb = __skb_dequeue(&frames))) { |
1170 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1171 | struct ieee80211_hdr *hdr = (void *) skb->data; | |
40b96408 JB |
1172 | u8 *qoshdr = NULL; |
1173 | ||
1174 | num++; | |
af818581 | 1175 | |
47086fc5 JB |
1176 | /* |
1177 | * Tell TX path to send this frame even though the | |
1178 | * STA may still remain is PS mode after this frame | |
1179 | * exchange. | |
1180 | */ | |
02f2f1a9 | 1181 | info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; |
47086fc5 JB |
1182 | |
1183 | /* | |
1184 | * Use MoreData flag to indicate whether there are | |
1185 | * more buffered frames for this STA | |
1186 | */ | |
24b9c373 | 1187 | if (more_data || !skb_queue_empty(&frames)) |
47086fc5 JB |
1188 | hdr->frame_control |= |
1189 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
24b9c373 JD |
1190 | else |
1191 | hdr->frame_control &= | |
1192 | cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
47086fc5 | 1193 | |
40b96408 JB |
1194 | if (ieee80211_is_data_qos(hdr->frame_control) || |
1195 | ieee80211_is_qos_nullfunc(hdr->frame_control)) | |
1196 | qoshdr = ieee80211_get_qos_ctl(hdr); | |
1197 | ||
52a3f20c MP |
1198 | /* end service period after last frame */ |
1199 | if (skb_queue_empty(&frames)) { | |
1200 | if (reason == IEEE80211_FRAME_RELEASE_UAPSD && | |
1201 | qoshdr) | |
1202 | *qoshdr |= IEEE80211_QOS_CTL_EOSP; | |
1203 | ||
1204 | info->flags |= IEEE80211_TX_STATUS_EOSP | | |
1205 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
1206 | } | |
deeaee19 | 1207 | |
40b96408 JB |
1208 | if (qoshdr) |
1209 | tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK); | |
1210 | else | |
1211 | tids |= BIT(0); | |
1212 | ||
47086fc5 JB |
1213 | __skb_queue_tail(&pending, skb); |
1214 | } | |
af818581 | 1215 | |
40b96408 JB |
1216 | drv_allow_buffered_frames(local, sta, tids, num, |
1217 | reason, more_data); | |
1218 | ||
47086fc5 | 1219 | ieee80211_add_pending_skbs(local, &pending); |
af818581 | 1220 | |
c868cb35 | 1221 | sta_info_recalc_tim(sta); |
af818581 JB |
1222 | } else { |
1223 | /* | |
4049e09a JB |
1224 | * We need to release a frame that is buffered somewhere in the |
1225 | * driver ... it'll have to handle that. | |
1226 | * Note that, as per the comment above, it'll also have to see | |
1227 | * if there is more than just one frame on the specific TID that | |
1228 | * we're releasing from, and it needs to set the more-data bit | |
1229 | * accordingly if we tell it that there's no more data. If we do | |
1230 | * tell it there's more data, then of course the more-data bit | |
1231 | * needs to be set anyway. | |
1232 | */ | |
1233 | drv_release_buffered_frames(local, sta, driver_release_tids, | |
47086fc5 | 1234 | n_frames, reason, more_data); |
4049e09a JB |
1235 | |
1236 | /* | |
1237 | * Note that we don't recalculate the TIM bit here as it would | |
1238 | * most likely have no effect at all unless the driver told us | |
1239 | * that the TID became empty before returning here from the | |
1240 | * release function. | |
1241 | * Either way, however, when the driver tells us that the TID | |
1242 | * became empty we'll do the TIM recalculation. | |
af818581 | 1243 | */ |
af818581 JB |
1244 | } |
1245 | } | |
1246 | ||
47086fc5 JB |
1247 | void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) |
1248 | { | |
1249 | u8 ignore_for_response = sta->sta.uapsd_queues; | |
1250 | ||
1251 | /* | |
1252 | * If all ACs are delivery-enabled then we should reply | |
1253 | * from any of them, if only some are enabled we reply | |
1254 | * only from the non-enabled ones. | |
1255 | */ | |
1256 | if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1) | |
1257 | ignore_for_response = 0; | |
1258 | ||
1259 | ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response, | |
1260 | IEEE80211_FRAME_RELEASE_PSPOLL); | |
1261 | } | |
1262 | ||
1263 | void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta) | |
1264 | { | |
1265 | int n_frames = sta->sta.max_sp; | |
1266 | u8 delivery_enabled = sta->sta.uapsd_queues; | |
1267 | ||
1268 | /* | |
1269 | * If we ever grow support for TSPEC this might happen if | |
1270 | * the TSPEC update from hostapd comes in between a trigger | |
1271 | * frame setting WLAN_STA_UAPSD in the RX path and this | |
1272 | * actually getting called. | |
1273 | */ | |
1274 | if (!delivery_enabled) | |
1275 | return; | |
1276 | ||
47086fc5 JB |
1277 | switch (sta->sta.max_sp) { |
1278 | case 1: | |
1279 | n_frames = 2; | |
1280 | break; | |
1281 | case 2: | |
1282 | n_frames = 4; | |
1283 | break; | |
1284 | case 3: | |
1285 | n_frames = 6; | |
1286 | break; | |
1287 | case 0: | |
1288 | /* XXX: what is a good value? */ | |
1289 | n_frames = 8; | |
1290 | break; | |
1291 | } | |
1292 | ||
1293 | ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled, | |
1294 | IEEE80211_FRAME_RELEASE_UAPSD); | |
1295 | } | |
1296 | ||
af818581 JB |
1297 | void ieee80211_sta_block_awake(struct ieee80211_hw *hw, |
1298 | struct ieee80211_sta *pubsta, bool block) | |
1299 | { | |
1300 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
1301 | ||
b5878a2d JB |
1302 | trace_api_sta_block_awake(sta->local, pubsta, block); |
1303 | ||
af818581 | 1304 | if (block) |
c2c98fde JB |
1305 | set_sta_flag(sta, WLAN_STA_PS_DRIVER); |
1306 | else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) | |
af818581 JB |
1307 | ieee80211_queue_work(hw, &sta->drv_unblock_wk); |
1308 | } | |
1309 | EXPORT_SYMBOL(ieee80211_sta_block_awake); | |
dcf55fb5 | 1310 | |
37fbd908 JB |
1311 | void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta) |
1312 | { | |
1313 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
1314 | struct ieee80211_local *local = sta->local; | |
1315 | struct sk_buff *skb; | |
1316 | struct skb_eosp_msg_data *data; | |
1317 | ||
1318 | trace_api_eosp(local, pubsta); | |
1319 | ||
1320 | skb = alloc_skb(0, GFP_ATOMIC); | |
1321 | if (!skb) { | |
1322 | /* too bad ... but race is better than loss */ | |
1323 | clear_sta_flag(sta, WLAN_STA_SP); | |
1324 | return; | |
1325 | } | |
1326 | ||
1327 | data = (void *)skb->cb; | |
1328 | memcpy(data->sta, pubsta->addr, ETH_ALEN); | |
1329 | memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN); | |
1330 | skb->pkt_type = IEEE80211_EOSP_MSG; | |
1331 | skb_queue_tail(&local->skb_queue, skb); | |
1332 | tasklet_schedule(&local->tasklet); | |
1333 | } | |
1334 | EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe); | |
1335 | ||
042ec453 JB |
1336 | void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta, |
1337 | u8 tid, bool buffered) | |
dcf55fb5 FF |
1338 | { |
1339 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
1340 | ||
948d887d | 1341 | if (WARN_ON(tid >= STA_TID_NUM)) |
042ec453 JB |
1342 | return; |
1343 | ||
948d887d JB |
1344 | if (buffered) |
1345 | set_bit(tid, &sta->driver_buffered_tids); | |
1346 | else | |
1347 | clear_bit(tid, &sta->driver_buffered_tids); | |
1348 | ||
c868cb35 | 1349 | sta_info_recalc_tim(sta); |
dcf55fb5 | 1350 | } |
042ec453 | 1351 | EXPORT_SYMBOL(ieee80211_sta_set_buffered); |
d9a7ddb0 | 1352 | |
83d5cc01 JB |
1353 | int sta_info_move_state(struct sta_info *sta, |
1354 | enum ieee80211_sta_state new_state) | |
d9a7ddb0 | 1355 | { |
8bf11d8d | 1356 | might_sleep(); |
d9a7ddb0 JB |
1357 | |
1358 | if (sta->sta_state == new_state) | |
1359 | return 0; | |
1360 | ||
f09603a2 JB |
1361 | /* check allowed transitions first */ |
1362 | ||
1363 | switch (new_state) { | |
1364 | case IEEE80211_STA_NONE: | |
1365 | if (sta->sta_state != IEEE80211_STA_AUTH) | |
1366 | return -EINVAL; | |
1367 | break; | |
1368 | case IEEE80211_STA_AUTH: | |
1369 | if (sta->sta_state != IEEE80211_STA_NONE && | |
1370 | sta->sta_state != IEEE80211_STA_ASSOC) | |
1371 | return -EINVAL; | |
1372 | break; | |
1373 | case IEEE80211_STA_ASSOC: | |
1374 | if (sta->sta_state != IEEE80211_STA_AUTH && | |
1375 | sta->sta_state != IEEE80211_STA_AUTHORIZED) | |
1376 | return -EINVAL; | |
1377 | break; | |
1378 | case IEEE80211_STA_AUTHORIZED: | |
1379 | if (sta->sta_state != IEEE80211_STA_ASSOC) | |
1380 | return -EINVAL; | |
1381 | break; | |
1382 | default: | |
1383 | WARN(1, "invalid state %d", new_state); | |
1384 | return -EINVAL; | |
1385 | } | |
1386 | ||
79027596 | 1387 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
f09603a2 JB |
1388 | printk(KERN_DEBUG "%s: moving STA %pM to state %d\n", |
1389 | sta->sdata->name, sta->sta.addr, new_state); | |
79027596 | 1390 | #endif |
f09603a2 JB |
1391 | |
1392 | /* | |
1393 | * notify the driver before the actual changes so it can | |
1394 | * fail the transition | |
1395 | */ | |
1396 | if (test_sta_flag(sta, WLAN_STA_INSERTED)) { | |
1397 | int err = drv_sta_state(sta->local, sta->sdata, sta, | |
1398 | sta->sta_state, new_state); | |
1399 | if (err) | |
1400 | return err; | |
1401 | } | |
1402 | ||
1403 | /* reflect the change in all state variables */ | |
1404 | ||
d9a7ddb0 JB |
1405 | switch (new_state) { |
1406 | case IEEE80211_STA_NONE: | |
1407 | if (sta->sta_state == IEEE80211_STA_AUTH) | |
1408 | clear_bit(WLAN_STA_AUTH, &sta->_flags); | |
d9a7ddb0 JB |
1409 | break; |
1410 | case IEEE80211_STA_AUTH: | |
1411 | if (sta->sta_state == IEEE80211_STA_NONE) | |
1412 | set_bit(WLAN_STA_AUTH, &sta->_flags); | |
1413 | else if (sta->sta_state == IEEE80211_STA_ASSOC) | |
1414 | clear_bit(WLAN_STA_ASSOC, &sta->_flags); | |
d9a7ddb0 JB |
1415 | break; |
1416 | case IEEE80211_STA_ASSOC: | |
29623892 | 1417 | if (sta->sta_state == IEEE80211_STA_AUTH) { |
d9a7ddb0 | 1418 | set_bit(WLAN_STA_ASSOC, &sta->_flags); |
29623892 JB |
1419 | } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) { |
1420 | if (sta->sdata->vif.type == NL80211_IFTYPE_AP) | |
030ef8f8 | 1421 | atomic_dec(&sta->sdata->u.ap.num_mcast_sta); |
d9a7ddb0 | 1422 | clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags); |
f09603a2 | 1423 | } |
d9a7ddb0 JB |
1424 | break; |
1425 | case IEEE80211_STA_AUTHORIZED: | |
29623892 JB |
1426 | if (sta->sta_state == IEEE80211_STA_ASSOC) { |
1427 | if (sta->sdata->vif.type == NL80211_IFTYPE_AP) | |
030ef8f8 | 1428 | atomic_inc(&sta->sdata->u.ap.num_mcast_sta); |
d9a7ddb0 | 1429 | set_bit(WLAN_STA_AUTHORIZED, &sta->_flags); |
f09603a2 | 1430 | } |
d9a7ddb0 JB |
1431 | break; |
1432 | default: | |
f09603a2 | 1433 | break; |
d9a7ddb0 JB |
1434 | } |
1435 | ||
d9a7ddb0 JB |
1436 | sta->sta_state = new_state; |
1437 | ||
1438 | return 0; | |
1439 | } |