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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 && |
b203ca39 | 105 | ether_addr_equal(sta->sta.addr, addr)) |
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)) && |
b203ca39 | 128 | ether_addr_equal(sta->sta.addr, addr)) |
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 | 171 | |
bdcbd8e0 | 172 | sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr); |
93e5deb1 JB |
173 | |
174 | kfree(sta); | |
175 | } | |
176 | ||
4d33960b | 177 | /* Caller must hold local->sta_mtx */ |
d0709a65 JB |
178 | static void sta_info_hash_add(struct ieee80211_local *local, |
179 | struct sta_info *sta) | |
f0706e82 | 180 | { |
4d33960b | 181 | lockdep_assert_held(&local->sta_mtx); |
17741cdc | 182 | sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; |
cf778b00 | 183 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); |
f0706e82 | 184 | } |
f0706e82 | 185 | |
af818581 JB |
186 | static void sta_unblock(struct work_struct *wk) |
187 | { | |
188 | struct sta_info *sta; | |
189 | ||
190 | sta = container_of(wk, struct sta_info, drv_unblock_wk); | |
191 | ||
192 | if (sta->dead) | |
193 | return; | |
194 | ||
54420473 HS |
195 | if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { |
196 | local_bh_disable(); | |
af818581 | 197 | ieee80211_sta_ps_deliver_wakeup(sta); |
54420473 HS |
198 | local_bh_enable(); |
199 | } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) { | |
c2c98fde | 200 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
ce662b44 JB |
201 | |
202 | local_bh_disable(); | |
af818581 | 203 | ieee80211_sta_ps_deliver_poll_response(sta); |
ce662b44 | 204 | local_bh_enable(); |
c2c98fde JB |
205 | } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) { |
206 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); | |
ce662b44 JB |
207 | |
208 | local_bh_disable(); | |
47086fc5 | 209 | ieee80211_sta_ps_deliver_uapsd(sta); |
ce662b44 | 210 | local_bh_enable(); |
50a9432d | 211 | } else |
c2c98fde | 212 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
af818581 JB |
213 | } |
214 | ||
af65cd96 JB |
215 | static int sta_prepare_rate_control(struct ieee80211_local *local, |
216 | struct sta_info *sta, gfp_t gfp) | |
217 | { | |
218 | if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) | |
219 | return 0; | |
220 | ||
889cbb91 | 221 | sta->rate_ctrl = local->rate_ctrl; |
af65cd96 JB |
222 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, |
223 | &sta->sta, gfp); | |
889cbb91 | 224 | if (!sta->rate_ctrl_priv) |
af65cd96 | 225 | return -ENOMEM; |
af65cd96 JB |
226 | |
227 | return 0; | |
228 | } | |
229 | ||
73651ee6 | 230 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
56544160 | 231 | const u8 *addr, gfp_t gfp) |
f0706e82 | 232 | { |
d0709a65 | 233 | struct ieee80211_local *local = sdata->local; |
f0706e82 | 234 | struct sta_info *sta; |
ebe27c91 | 235 | struct timespec uptime; |
16c5f15c | 236 | int i; |
f0706e82 | 237 | |
17741cdc | 238 | sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); |
f0706e82 | 239 | if (!sta) |
73651ee6 | 240 | return NULL; |
f0706e82 | 241 | |
07346f81 | 242 | spin_lock_init(&sta->lock); |
af818581 | 243 | INIT_WORK(&sta->drv_unblock_wk, sta_unblock); |
67c282c0 | 244 | INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); |
a93e3644 | 245 | mutex_init(&sta->ampdu_mlme.mtx); |
07346f81 | 246 | |
17741cdc | 247 | memcpy(sta->sta.addr, addr, ETH_ALEN); |
d0709a65 JB |
248 | sta->local = local; |
249 | sta->sdata = sdata; | |
8bc8aecd | 250 | sta->last_rx = jiffies; |
f0706e82 | 251 | |
71ec375c JB |
252 | sta->sta_state = IEEE80211_STA_NONE; |
253 | ||
ebe27c91 MSS |
254 | do_posix_clock_monotonic_gettime(&uptime); |
255 | sta->last_connected = uptime.tv_sec; | |
541a45a1 BR |
256 | ewma_init(&sta->avg_signal, 1024, 8); |
257 | ||
af65cd96 | 258 | if (sta_prepare_rate_control(local, sta, gfp)) { |
f0706e82 | 259 | kfree(sta); |
73651ee6 | 260 | return NULL; |
f0706e82 JB |
261 | } |
262 | ||
16c5f15c | 263 | for (i = 0; i < STA_TID_NUM; i++) { |
a622ab72 JB |
264 | /* |
265 | * timer_to_tid must be initialized with identity mapping | |
266 | * to enable session_timer's data differentiation. See | |
267 | * sta_rx_agg_session_timer_expired for usage. | |
268 | */ | |
16c5f15c | 269 | sta->timer_to_tid[i] = i; |
16c5f15c | 270 | } |
948d887d JB |
271 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { |
272 | skb_queue_head_init(&sta->ps_tx_buf[i]); | |
273 | skb_queue_head_init(&sta->tx_filtered[i]); | |
274 | } | |
73651ee6 | 275 | |
cccaec98 | 276 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) |
4be929be | 277 | sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); |
cccaec98 | 278 | |
bdcbd8e0 | 279 | sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr); |
73651ee6 | 280 | |
03e4497e | 281 | #ifdef CONFIG_MAC80211_MESH |
57cf8043 | 282 | sta->plink_state = NL80211_PLINK_LISTEN; |
03e4497e JB |
283 | init_timer(&sta->plink_timer); |
284 | #endif | |
285 | ||
73651ee6 JB |
286 | return sta; |
287 | } | |
288 | ||
8c71df7a | 289 | static int sta_info_insert_check(struct sta_info *sta) |
34e89507 | 290 | { |
34e89507 | 291 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
34e89507 | 292 | |
03e4497e JB |
293 | /* |
294 | * Can't be a WARN_ON because it can be triggered through a race: | |
295 | * something inserts a STA (on one CPU) without holding the RTNL | |
296 | * and another CPU turns off the net device. | |
297 | */ | |
8c71df7a GE |
298 | if (unlikely(!ieee80211_sdata_running(sdata))) |
299 | return -ENETDOWN; | |
03e4497e | 300 | |
b203ca39 | 301 | if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) || |
8c71df7a GE |
302 | is_multicast_ether_addr(sta->sta.addr))) |
303 | return -EINVAL; | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
f09603a2 JB |
308 | static int sta_info_insert_drv_state(struct ieee80211_local *local, |
309 | struct ieee80211_sub_if_data *sdata, | |
310 | struct sta_info *sta) | |
311 | { | |
312 | enum ieee80211_sta_state state; | |
313 | int err = 0; | |
314 | ||
315 | for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) { | |
316 | err = drv_sta_state(local, sdata, sta, state, state + 1); | |
317 | if (err) | |
318 | break; | |
319 | } | |
320 | ||
321 | if (!err) { | |
a4ec45a4 JB |
322 | /* |
323 | * Drivers using legacy sta_add/sta_remove callbacks only | |
324 | * get uploaded set to true after sta_add is called. | |
325 | */ | |
326 | if (!local->ops->sta_add) | |
327 | sta->uploaded = true; | |
f09603a2 JB |
328 | return 0; |
329 | } | |
330 | ||
331 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
bdcbd8e0 JB |
332 | sdata_info(sdata, |
333 | "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n", | |
334 | sta->sta.addr, state + 1, err); | |
f09603a2 JB |
335 | err = 0; |
336 | } | |
337 | ||
338 | /* unwind on error */ | |
339 | for (; state > IEEE80211_STA_NOTEXIST; state--) | |
340 | WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1)); | |
341 | ||
342 | return err; | |
343 | } | |
344 | ||
8c71df7a GE |
345 | /* |
346 | * should be called with sta_mtx locked | |
347 | * this function replaces the mutex lock | |
348 | * with a RCU lock | |
349 | */ | |
4d33960b | 350 | static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU) |
8c71df7a GE |
351 | { |
352 | struct ieee80211_local *local = sta->local; | |
353 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
7852e361 | 354 | struct station_info sinfo; |
8c71df7a GE |
355 | int err = 0; |
356 | ||
357 | lockdep_assert_held(&local->sta_mtx); | |
34e89507 | 358 | |
7852e361 JB |
359 | /* check if STA exists already */ |
360 | if (sta_info_get_bss(sdata, sta->sta.addr)) { | |
361 | err = -EEXIST; | |
362 | goto out_err; | |
4d33960b | 363 | } |
32bfd35d | 364 | |
7852e361 JB |
365 | /* notify driver */ |
366 | err = sta_info_insert_drv_state(local, sdata, sta); | |
367 | if (err) | |
368 | goto out_err; | |
4d33960b | 369 | |
7852e361 JB |
370 | local->num_sta++; |
371 | local->sta_generation++; | |
372 | smp_mb(); | |
4d33960b | 373 | |
7852e361 JB |
374 | /* make the station visible */ |
375 | sta_info_hash_add(local, sta); | |
83d5cc01 | 376 | |
794454ce | 377 | list_add_rcu(&sta->list, &local->sta_list); |
4d33960b | 378 | |
7852e361 | 379 | set_sta_flag(sta, WLAN_STA_INSERTED); |
4d33960b | 380 | |
7852e361 JB |
381 | ieee80211_sta_debugfs_add(sta); |
382 | rate_control_add_sta_debugfs(sta); | |
4d33960b | 383 | |
7852e361 JB |
384 | memset(&sinfo, 0, sizeof(sinfo)); |
385 | sinfo.filled = 0; | |
386 | sinfo.generation = local->sta_generation; | |
387 | cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); | |
d0709a65 | 388 | |
bdcbd8e0 | 389 | sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr); |
f0706e82 | 390 | |
34e89507 JB |
391 | /* move reference to rcu-protected */ |
392 | rcu_read_lock(); | |
393 | mutex_unlock(&local->sta_mtx); | |
e9f207f0 | 394 | |
73651ee6 JB |
395 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
396 | mesh_accept_plinks_update(sdata); | |
397 | ||
8c71df7a | 398 | return 0; |
4d33960b JB |
399 | out_err: |
400 | mutex_unlock(&local->sta_mtx); | |
401 | rcu_read_lock(); | |
402 | return err; | |
8c71df7a GE |
403 | } |
404 | ||
405 | int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) | |
406 | { | |
407 | struct ieee80211_local *local = sta->local; | |
8c71df7a GE |
408 | int err = 0; |
409 | ||
4d33960b JB |
410 | might_sleep(); |
411 | ||
8c71df7a GE |
412 | err = sta_info_insert_check(sta); |
413 | if (err) { | |
414 | rcu_read_lock(); | |
415 | goto out_free; | |
416 | } | |
417 | ||
8c71df7a GE |
418 | mutex_lock(&local->sta_mtx); |
419 | ||
4d33960b | 420 | err = sta_info_insert_finish(sta); |
8c71df7a GE |
421 | if (err) |
422 | goto out_free; | |
423 | ||
73651ee6 | 424 | return 0; |
93e5deb1 JB |
425 | out_free: |
426 | BUG_ON(!err); | |
d9a7ddb0 | 427 | sta_info_free(local, sta); |
93e5deb1 | 428 | return err; |
f0706e82 JB |
429 | } |
430 | ||
34e89507 JB |
431 | int sta_info_insert(struct sta_info *sta) |
432 | { | |
433 | int err = sta_info_insert_rcu(sta); | |
434 | ||
435 | rcu_read_unlock(); | |
436 | ||
437 | return err; | |
438 | } | |
439 | ||
004c872e JB |
440 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
441 | { | |
442 | /* | |
443 | * This format has been mandated by the IEEE specifications, | |
444 | * so this line may not be changed to use the __set_bit() format. | |
445 | */ | |
446 | bss->tim[aid / 8] |= (1 << (aid % 8)); | |
447 | } | |
448 | ||
449 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) | |
450 | { | |
451 | /* | |
452 | * This format has been mandated by the IEEE specifications, | |
453 | * so this line may not be changed to use the __clear_bit() format. | |
454 | */ | |
455 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); | |
456 | } | |
457 | ||
948d887d | 458 | static unsigned long ieee80211_tids_for_ac(int ac) |
004c872e | 459 | { |
948d887d JB |
460 | /* If we ever support TIDs > 7, this obviously needs to be adjusted */ |
461 | switch (ac) { | |
462 | case IEEE80211_AC_VO: | |
463 | return BIT(6) | BIT(7); | |
464 | case IEEE80211_AC_VI: | |
465 | return BIT(4) | BIT(5); | |
466 | case IEEE80211_AC_BE: | |
467 | return BIT(0) | BIT(3); | |
468 | case IEEE80211_AC_BK: | |
469 | return BIT(1) | BIT(2); | |
470 | default: | |
471 | WARN_ON(1); | |
472 | return 0; | |
d0709a65 | 473 | } |
004c872e JB |
474 | } |
475 | ||
c868cb35 | 476 | void sta_info_recalc_tim(struct sta_info *sta) |
004c872e | 477 | { |
c868cb35 JB |
478 | struct ieee80211_local *local = sta->local; |
479 | struct ieee80211_if_ap *bss = sta->sdata->bss; | |
d0709a65 | 480 | unsigned long flags; |
948d887d JB |
481 | bool indicate_tim = false; |
482 | u8 ignore_for_tim = sta->sta.uapsd_queues; | |
483 | int ac; | |
004c872e | 484 | |
c868cb35 JB |
485 | if (WARN_ON_ONCE(!sta->sdata->bss)) |
486 | return; | |
3e122be0 | 487 | |
c868cb35 JB |
488 | /* No need to do anything if the driver does all */ |
489 | if (local->hw.flags & IEEE80211_HW_AP_LINK_PS) | |
490 | return; | |
004c872e | 491 | |
c868cb35 JB |
492 | if (sta->dead) |
493 | goto done; | |
3e122be0 | 494 | |
948d887d JB |
495 | /* |
496 | * If all ACs are delivery-enabled then we should build | |
497 | * the TIM bit for all ACs anyway; if only some are then | |
498 | * we ignore those and build the TIM bit using only the | |
499 | * non-enabled ones. | |
500 | */ | |
501 | if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1) | |
502 | ignore_for_tim = 0; | |
503 | ||
504 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { | |
505 | unsigned long tids; | |
3e122be0 | 506 | |
948d887d JB |
507 | if (ignore_for_tim & BIT(ac)) |
508 | continue; | |
509 | ||
510 | indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) || | |
511 | !skb_queue_empty(&sta->ps_tx_buf[ac]); | |
512 | if (indicate_tim) | |
513 | break; | |
3e122be0 | 514 | |
948d887d JB |
515 | tids = ieee80211_tids_for_ac(ac); |
516 | ||
517 | indicate_tim |= | |
518 | sta->driver_buffered_tids & tids; | |
d0709a65 | 519 | } |
004c872e | 520 | |
c868cb35 | 521 | done: |
4d33960b | 522 | spin_lock_irqsave(&local->tim_lock, flags); |
004c872e | 523 | |
948d887d | 524 | if (indicate_tim) |
c868cb35 JB |
525 | __bss_tim_set(bss, sta->sta.aid); |
526 | else | |
527 | __bss_tim_clear(bss, sta->sta.aid); | |
004c872e | 528 | |
c868cb35 JB |
529 | if (local->ops->set_tim) { |
530 | local->tim_in_locked_section = true; | |
948d887d | 531 | drv_set_tim(local, &sta->sta, indicate_tim); |
c868cb35 JB |
532 | local->tim_in_locked_section = false; |
533 | } | |
3e122be0 | 534 | |
4d33960b | 535 | spin_unlock_irqrestore(&local->tim_lock, flags); |
004c872e JB |
536 | } |
537 | ||
cd0b8d89 | 538 | static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb) |
f0706e82 | 539 | { |
e039fa4a | 540 | struct ieee80211_tx_info *info; |
f0706e82 JB |
541 | int timeout; |
542 | ||
543 | if (!skb) | |
cd0b8d89 | 544 | return false; |
f0706e82 | 545 | |
e039fa4a | 546 | info = IEEE80211_SKB_CB(skb); |
f0706e82 JB |
547 | |
548 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ | |
57c4d7b4 JB |
549 | timeout = (sta->listen_interval * |
550 | sta->sdata->vif.bss_conf.beacon_int * | |
551 | 32 / 15625) * HZ; | |
f0706e82 JB |
552 | if (timeout < STA_TX_BUFFER_EXPIRE) |
553 | timeout = STA_TX_BUFFER_EXPIRE; | |
e039fa4a | 554 | return time_after(jiffies, info->control.jiffies + timeout); |
f0706e82 JB |
555 | } |
556 | ||
557 | ||
948d887d JB |
558 | static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local, |
559 | struct sta_info *sta, int ac) | |
f0706e82 JB |
560 | { |
561 | unsigned long flags; | |
562 | struct sk_buff *skb; | |
563 | ||
60750397 JB |
564 | /* |
565 | * First check for frames that should expire on the filtered | |
566 | * queue. Frames here were rejected by the driver and are on | |
567 | * a separate queue to avoid reordering with normal PS-buffered | |
568 | * frames. They also aren't accounted for right now in the | |
569 | * total_ps_buffered counter. | |
570 | */ | |
571 | for (;;) { | |
948d887d JB |
572 | spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); |
573 | skb = skb_peek(&sta->tx_filtered[ac]); | |
60750397 | 574 | if (sta_info_buffer_expired(sta, skb)) |
948d887d | 575 | skb = __skb_dequeue(&sta->tx_filtered[ac]); |
60750397 JB |
576 | else |
577 | skb = NULL; | |
948d887d | 578 | spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); |
60750397 JB |
579 | |
580 | /* | |
581 | * Frames are queued in order, so if this one | |
582 | * hasn't expired yet we can stop testing. If | |
583 | * we actually reached the end of the queue we | |
584 | * also need to stop, of course. | |
585 | */ | |
586 | if (!skb) | |
587 | break; | |
588 | dev_kfree_skb(skb); | |
589 | } | |
590 | ||
591 | /* | |
592 | * Now also check the normal PS-buffered queue, this will | |
593 | * only find something if the filtered queue was emptied | |
594 | * since the filtered frames are all before the normal PS | |
595 | * buffered frames. | |
596 | */ | |
f0706e82 | 597 | for (;;) { |
948d887d JB |
598 | spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); |
599 | skb = skb_peek(&sta->ps_tx_buf[ac]); | |
57c4d7b4 | 600 | if (sta_info_buffer_expired(sta, skb)) |
948d887d | 601 | skb = __skb_dequeue(&sta->ps_tx_buf[ac]); |
836341a7 | 602 | else |
f0706e82 | 603 | skb = NULL; |
948d887d | 604 | spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); |
f0706e82 | 605 | |
60750397 JB |
606 | /* |
607 | * frames are queued in order, so if this one | |
608 | * hasn't expired yet (or we reached the end of | |
609 | * the queue) we can stop testing | |
610 | */ | |
836341a7 | 611 | if (!skb) |
f0706e82 | 612 | break; |
836341a7 | 613 | |
836341a7 | 614 | local->total_ps_buffered--; |
bdcbd8e0 JB |
615 | ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n", |
616 | sta->sta.addr); | |
836341a7 | 617 | dev_kfree_skb(skb); |
f0706e82 | 618 | } |
3393a608 | 619 | |
60750397 JB |
620 | /* |
621 | * Finally, recalculate the TIM bit for this station -- it might | |
622 | * now be clear because the station was too slow to retrieve its | |
623 | * frames. | |
624 | */ | |
625 | sta_info_recalc_tim(sta); | |
626 | ||
627 | /* | |
628 | * Return whether there are any frames still buffered, this is | |
629 | * used to check whether the cleanup timer still needs to run, | |
630 | * if there are no frames we don't need to rearm the timer. | |
631 | */ | |
948d887d JB |
632 | return !(skb_queue_empty(&sta->ps_tx_buf[ac]) && |
633 | skb_queue_empty(&sta->tx_filtered[ac])); | |
634 | } | |
635 | ||
636 | static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, | |
637 | struct sta_info *sta) | |
638 | { | |
639 | bool have_buffered = false; | |
640 | int ac; | |
641 | ||
642 | /* This is only necessary for stations on BSS interfaces */ | |
643 | if (!sta->sdata->bss) | |
644 | return false; | |
645 | ||
646 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) | |
647 | have_buffered |= | |
648 | sta_info_cleanup_expire_buffered_ac(local, sta, ac); | |
649 | ||
650 | return have_buffered; | |
f0706e82 JB |
651 | } |
652 | ||
83d5cc01 | 653 | int __must_check __sta_info_destroy(struct sta_info *sta) |
f0706e82 | 654 | { |
34e89507 JB |
655 | struct ieee80211_local *local; |
656 | struct ieee80211_sub_if_data *sdata; | |
948d887d | 657 | int ret, i, ac; |
42624d49 | 658 | struct tid_ampdu_tx *tid_tx; |
f0706e82 | 659 | |
34e89507 | 660 | might_sleep(); |
f0706e82 | 661 | |
34e89507 JB |
662 | if (!sta) |
663 | return -ENOENT; | |
5bb644a0 | 664 | |
34e89507 JB |
665 | local = sta->local; |
666 | sdata = sta->sdata; | |
f0706e82 | 667 | |
83d5cc01 JB |
668 | lockdep_assert_held(&local->sta_mtx); |
669 | ||
098a6070 JB |
670 | /* |
671 | * Before removing the station from the driver and | |
672 | * rate control, it might still start new aggregation | |
673 | * sessions -- block that to make sure the tear-down | |
674 | * will be sufficient. | |
675 | */ | |
c2c98fde | 676 | set_sta_flag(sta, WLAN_STA_BLOCK_BA); |
53f73c09 | 677 | ieee80211_sta_tear_down_BA_sessions(sta, true); |
098a6070 | 678 | |
34e89507 | 679 | ret = sta_info_hash_del(local, sta); |
34e89507 JB |
680 | if (ret) |
681 | return ret; | |
682 | ||
794454ce | 683 | list_del_rcu(&sta->list); |
4d33960b | 684 | |
8cb23153 | 685 | mutex_lock(&local->key_mtx); |
e31b8213 | 686 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) |
40b275b6 | 687 | __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i])); |
e31b8213 | 688 | if (sta->ptk) |
40b275b6 | 689 | __ieee80211_key_free(key_mtx_dereference(local, sta->ptk)); |
8cb23153 | 690 | mutex_unlock(&local->key_mtx); |
34e89507 JB |
691 | |
692 | sta->dead = true; | |
693 | ||
34e89507 JB |
694 | local->num_sta--; |
695 | local->sta_generation++; | |
696 | ||
697 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
a9b3cd7f | 698 | RCU_INIT_POINTER(sdata->u.vlan.sta, NULL); |
34e89507 | 699 | |
83d5cc01 | 700 | while (sta->sta_state > IEEE80211_STA_NONE) { |
f09603a2 JB |
701 | ret = sta_info_move_state(sta, sta->sta_state - 1); |
702 | if (ret) { | |
83d5cc01 JB |
703 | WARN_ON_ONCE(1); |
704 | break; | |
705 | } | |
706 | } | |
d9a7ddb0 | 707 | |
f09603a2 | 708 | if (sta->uploaded) { |
f09603a2 JB |
709 | ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE, |
710 | IEEE80211_STA_NOTEXIST); | |
711 | WARN_ON_ONCE(ret != 0); | |
712 | } | |
34e89507 | 713 | |
e64b3795 JB |
714 | /* |
715 | * At this point, after we wait for an RCU grace period, | |
716 | * neither mac80211 nor the driver can reference this | |
717 | * sta struct any more except by still existing timers | |
718 | * associated with this station that we clean up below. | |
719 | */ | |
720 | synchronize_rcu(); | |
721 | ||
4f3eb0ba HS |
722 | if (test_sta_flag(sta, WLAN_STA_PS_STA)) { |
723 | BUG_ON(!sdata->bss); | |
724 | ||
725 | clear_sta_flag(sta, WLAN_STA_PS_STA); | |
726 | ||
727 | atomic_dec(&sdata->bss->num_sta_ps); | |
728 | sta_info_recalc_tim(sta); | |
729 | } | |
730 | ||
948d887d JB |
731 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
732 | local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]); | |
733 | __skb_queue_purge(&sta->ps_tx_buf[ac]); | |
734 | __skb_queue_purge(&sta->tx_filtered[ac]); | |
735 | } | |
c868cb35 | 736 | |
34e89507 | 737 | #ifdef CONFIG_MAC80211_MESH |
e64b3795 | 738 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
34e89507 | 739 | mesh_accept_plinks_update(sdata); |
34e89507 JB |
740 | #endif |
741 | ||
bdcbd8e0 JB |
742 | sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr); |
743 | ||
34e89507 JB |
744 | cancel_work_sync(&sta->drv_unblock_wk); |
745 | ||
ec15e68b JM |
746 | cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL); |
747 | ||
34e89507 JB |
748 | rate_control_remove_sta_debugfs(sta); |
749 | ieee80211_sta_debugfs_remove(sta); | |
750 | ||
751 | #ifdef CONFIG_MAC80211_MESH | |
752 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) { | |
753 | mesh_plink_deactivate(sta); | |
754 | del_timer_sync(&sta->plink_timer); | |
755 | } | |
756 | #endif | |
757 | ||
151a02f6 JB |
758 | /* |
759 | * Destroy aggregation state here. It would be nice to wait for the | |
760 | * driver to finish aggregation stop and then clean up, but for now | |
761 | * drivers have to handle aggregation stop being requested, followed | |
762 | * directly by station destruction. | |
42624d49 YAP |
763 | */ |
764 | for (i = 0; i < STA_TID_NUM; i++) { | |
151a02f6 | 765 | tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]); |
27bf8882 | 766 | if (!tid_tx) |
42624d49 | 767 | continue; |
151a02f6 JB |
768 | __skb_queue_purge(&tid_tx->pending); |
769 | kfree(tid_tx); | |
42624d49 YAP |
770 | } |
771 | ||
d9a7ddb0 | 772 | sta_info_free(local, sta); |
34e89507 JB |
773 | |
774 | return 0; | |
4d6141c3 JS |
775 | } |
776 | ||
34e89507 | 777 | int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) |
4d6141c3 | 778 | { |
34e89507 JB |
779 | struct sta_info *sta; |
780 | int ret; | |
4d6141c3 | 781 | |
34e89507 | 782 | mutex_lock(&sdata->local->sta_mtx); |
7852e361 | 783 | sta = sta_info_get(sdata, addr); |
34e89507 JB |
784 | ret = __sta_info_destroy(sta); |
785 | mutex_unlock(&sdata->local->sta_mtx); | |
4d6141c3 JS |
786 | |
787 | return ret; | |
788 | } | |
789 | ||
34e89507 JB |
790 | int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, |
791 | const u8 *addr) | |
e9f207f0 | 792 | { |
34e89507 JB |
793 | struct sta_info *sta; |
794 | int ret; | |
e9f207f0 | 795 | |
34e89507 | 796 | mutex_lock(&sdata->local->sta_mtx); |
7852e361 | 797 | sta = sta_info_get_bss(sdata, addr); |
34e89507 JB |
798 | ret = __sta_info_destroy(sta); |
799 | mutex_unlock(&sdata->local->sta_mtx); | |
d0709a65 | 800 | |
34e89507 JB |
801 | return ret; |
802 | } | |
e9f207f0 | 803 | |
34e89507 JB |
804 | static void sta_info_cleanup(unsigned long data) |
805 | { | |
806 | struct ieee80211_local *local = (struct ieee80211_local *) data; | |
807 | struct sta_info *sta; | |
3393a608 | 808 | bool timer_needed = false; |
34e89507 JB |
809 | |
810 | rcu_read_lock(); | |
811 | list_for_each_entry_rcu(sta, &local->sta_list, list) | |
3393a608 JO |
812 | if (sta_info_cleanup_expire_buffered(local, sta)) |
813 | timer_needed = true; | |
34e89507 | 814 | rcu_read_unlock(); |
e9f207f0 | 815 | |
34e89507 JB |
816 | if (local->quiescing) |
817 | return; | |
d0709a65 | 818 | |
3393a608 JO |
819 | if (!timer_needed) |
820 | return; | |
821 | ||
26d59535 JB |
822 | mod_timer(&local->sta_cleanup, |
823 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); | |
e9f207f0 | 824 | } |
e9f207f0 | 825 | |
f0706e82 JB |
826 | void sta_info_init(struct ieee80211_local *local) |
827 | { | |
4d33960b | 828 | spin_lock_init(&local->tim_lock); |
34e89507 | 829 | mutex_init(&local->sta_mtx); |
f0706e82 | 830 | INIT_LIST_HEAD(&local->sta_list); |
f0706e82 | 831 | |
b24b8a24 PE |
832 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
833 | (unsigned long)local); | |
f0706e82 JB |
834 | } |
835 | ||
836 | void sta_info_stop(struct ieee80211_local *local) | |
837 | { | |
f0706e82 | 838 | del_timer(&local->sta_cleanup); |
be8755e1 | 839 | sta_info_flush(local, NULL); |
f0706e82 JB |
840 | } |
841 | ||
f0706e82 JB |
842 | /** |
843 | * sta_info_flush - flush matching STA entries from the STA table | |
44213b5e JB |
844 | * |
845 | * Returns the number of removed STA entries. | |
846 | * | |
f0706e82 | 847 | * @local: local interface data |
d0709a65 | 848 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
f0706e82 | 849 | */ |
44213b5e | 850 | int sta_info_flush(struct ieee80211_local *local, |
af8cdcd8 | 851 | struct ieee80211_sub_if_data *sdata) |
f0706e82 JB |
852 | { |
853 | struct sta_info *sta, *tmp; | |
44213b5e | 854 | int ret = 0; |
f0706e82 | 855 | |
d0709a65 | 856 | might_sleep(); |
be8755e1 | 857 | |
34e89507 | 858 | mutex_lock(&local->sta_mtx); |
d0709a65 | 859 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
34316837 | 860 | if (!sdata || sdata == sta->sdata) { |
34e89507 | 861 | WARN_ON(__sta_info_destroy(sta)); |
34316837 JB |
862 | ret++; |
863 | } | |
be8755e1 | 864 | } |
34e89507 | 865 | mutex_unlock(&local->sta_mtx); |
44213b5e JB |
866 | |
867 | return ret; | |
f0706e82 | 868 | } |
dc6676b7 | 869 | |
24723d1b JB |
870 | void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, |
871 | unsigned long exp_time) | |
872 | { | |
873 | struct ieee80211_local *local = sdata->local; | |
874 | struct sta_info *sta, *tmp; | |
24723d1b | 875 | |
34e89507 | 876 | mutex_lock(&local->sta_mtx); |
e46a2cf9 MSS |
877 | |
878 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
ec2b774e ML |
879 | if (sdata != sta->sdata) |
880 | continue; | |
881 | ||
24723d1b | 882 | if (time_after(jiffies, sta->last_rx + exp_time)) { |
bdcbd8e0 JB |
883 | ibss_dbg(sdata, "expiring inactive STA %pM\n", |
884 | sta->sta.addr); | |
34e89507 | 885 | WARN_ON(__sta_info_destroy(sta)); |
24723d1b | 886 | } |
e46a2cf9 MSS |
887 | } |
888 | ||
34e89507 | 889 | mutex_unlock(&local->sta_mtx); |
24723d1b | 890 | } |
17741cdc | 891 | |
686b9cb9 BG |
892 | struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, |
893 | const u8 *addr, | |
894 | const u8 *localaddr) | |
17741cdc | 895 | { |
abe60632 | 896 | struct sta_info *sta, *nxt; |
17741cdc | 897 | |
686b9cb9 BG |
898 | /* |
899 | * Just return a random station if localaddr is NULL | |
900 | * ... first in list. | |
901 | */ | |
f7c65594 | 902 | for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { |
686b9cb9 | 903 | if (localaddr && |
b203ca39 | 904 | !ether_addr_equal(sta->sdata->vif.addr, localaddr)) |
686b9cb9 | 905 | continue; |
f7c65594 JB |
906 | if (!sta->uploaded) |
907 | return NULL; | |
abe60632 | 908 | return &sta->sta; |
f7c65594 JB |
909 | } |
910 | ||
abe60632 | 911 | return NULL; |
17741cdc | 912 | } |
686b9cb9 | 913 | EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); |
5ed176e1 JB |
914 | |
915 | struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, | |
916 | const u8 *addr) | |
917 | { | |
f7c65594 | 918 | struct sta_info *sta; |
5ed176e1 JB |
919 | |
920 | if (!vif) | |
921 | return NULL; | |
922 | ||
f7c65594 JB |
923 | sta = sta_info_get_bss(vif_to_sdata(vif), addr); |
924 | if (!sta) | |
925 | return NULL; | |
926 | ||
927 | if (!sta->uploaded) | |
928 | return NULL; | |
5ed176e1 | 929 | |
f7c65594 | 930 | return &sta->sta; |
5ed176e1 | 931 | } |
17741cdc | 932 | EXPORT_SYMBOL(ieee80211_find_sta); |
af818581 | 933 | |
50a9432d JB |
934 | static void clear_sta_ps_flags(void *_sta) |
935 | { | |
936 | struct sta_info *sta = _sta; | |
608383bf | 937 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
50a9432d | 938 | |
c2c98fde | 939 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
608383bf HS |
940 | if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA)) |
941 | atomic_dec(&sdata->bss->num_sta_ps); | |
50a9432d JB |
942 | } |
943 | ||
af818581 JB |
944 | /* powersave support code */ |
945 | void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) | |
946 | { | |
947 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
948 | struct ieee80211_local *local = sdata->local; | |
948d887d JB |
949 | struct sk_buff_head pending; |
950 | int filtered = 0, buffered = 0, ac; | |
951 | ||
c2c98fde | 952 | clear_sta_flag(sta, WLAN_STA_SP); |
47086fc5 | 953 | |
948d887d JB |
954 | BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1); |
955 | sta->driver_buffered_tids = 0; | |
af818581 | 956 | |
d057e5a3 AN |
957 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) |
958 | drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); | |
af818581 | 959 | |
948d887d | 960 | skb_queue_head_init(&pending); |
af818581 JB |
961 | |
962 | /* Send all buffered frames to the station */ | |
948d887d JB |
963 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
964 | int count = skb_queue_len(&pending), tmp; | |
965 | ||
966 | skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending); | |
967 | tmp = skb_queue_len(&pending); | |
968 | filtered += tmp - count; | |
969 | count = tmp; | |
970 | ||
971 | skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending); | |
972 | tmp = skb_queue_len(&pending); | |
973 | buffered += tmp - count; | |
974 | } | |
975 | ||
976 | ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta); | |
977 | ||
af818581 JB |
978 | local->total_ps_buffered -= buffered; |
979 | ||
c868cb35 JB |
980 | sta_info_recalc_tim(sta); |
981 | ||
bdcbd8e0 JB |
982 | ps_dbg(sdata, |
983 | "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n", | |
984 | sta->sta.addr, sta->sta.aid, filtered, buffered); | |
af818581 JB |
985 | } |
986 | ||
ce662b44 JB |
987 | static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata, |
988 | struct sta_info *sta, int tid, | |
40b96408 | 989 | enum ieee80211_frame_release_type reason) |
af818581 | 990 | { |
af818581 | 991 | struct ieee80211_local *local = sdata->local; |
ce662b44 | 992 | struct ieee80211_qos_hdr *nullfunc; |
af818581 | 993 | struct sk_buff *skb; |
ce662b44 JB |
994 | int size = sizeof(*nullfunc); |
995 | __le16 fc; | |
c2c98fde | 996 | bool qos = test_sta_flag(sta, WLAN_STA_WME); |
ce662b44 | 997 | struct ieee80211_tx_info *info; |
af818581 | 998 | |
ce662b44 JB |
999 | if (qos) { |
1000 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | | |
1001 | IEEE80211_STYPE_QOS_NULLFUNC | | |
1002 | IEEE80211_FCTL_FROMDS); | |
1003 | } else { | |
1004 | size -= 2; | |
1005 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | | |
1006 | IEEE80211_STYPE_NULLFUNC | | |
1007 | IEEE80211_FCTL_FROMDS); | |
af818581 | 1008 | } |
af818581 | 1009 | |
ce662b44 JB |
1010 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + size); |
1011 | if (!skb) | |
1012 | return; | |
1013 | ||
1014 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1015 | ||
1016 | nullfunc = (void *) skb_put(skb, size); | |
1017 | nullfunc->frame_control = fc; | |
1018 | nullfunc->duration_id = 0; | |
1019 | memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); | |
1020 | memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); | |
1021 | memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN); | |
1022 | ||
59b66255 JB |
1023 | skb->priority = tid; |
1024 | skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); | |
ce662b44 | 1025 | if (qos) { |
ce662b44 JB |
1026 | nullfunc->qos_ctrl = cpu_to_le16(tid); |
1027 | ||
40b96408 | 1028 | if (reason == IEEE80211_FRAME_RELEASE_UAPSD) |
ce662b44 JB |
1029 | nullfunc->qos_ctrl |= |
1030 | cpu_to_le16(IEEE80211_QOS_CTL_EOSP); | |
1031 | } | |
1032 | ||
1033 | info = IEEE80211_SKB_CB(skb); | |
1034 | ||
1035 | /* | |
1036 | * Tell TX path to send this frame even though the | |
1037 | * STA may still remain is PS mode after this frame | |
deeaee19 JB |
1038 | * exchange. Also set EOSP to indicate this packet |
1039 | * ends the poll/service period. | |
ce662b44 | 1040 | */ |
02f2f1a9 | 1041 | info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | |
deeaee19 JB |
1042 | IEEE80211_TX_STATUS_EOSP | |
1043 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
ce662b44 | 1044 | |
40b96408 JB |
1045 | drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false); |
1046 | ||
ce662b44 JB |
1047 | ieee80211_xmit(sdata, skb); |
1048 | } | |
1049 | ||
47086fc5 JB |
1050 | static void |
1051 | ieee80211_sta_ps_deliver_response(struct sta_info *sta, | |
1052 | int n_frames, u8 ignored_acs, | |
1053 | enum ieee80211_frame_release_type reason) | |
af818581 JB |
1054 | { |
1055 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
1056 | struct ieee80211_local *local = sdata->local; | |
4049e09a | 1057 | bool found = false; |
948d887d JB |
1058 | bool more_data = false; |
1059 | int ac; | |
4049e09a | 1060 | unsigned long driver_release_tids = 0; |
47086fc5 | 1061 | struct sk_buff_head frames; |
af818581 | 1062 | |
deeaee19 | 1063 | /* Service or PS-Poll period starts */ |
c2c98fde | 1064 | set_sta_flag(sta, WLAN_STA_SP); |
deeaee19 | 1065 | |
47086fc5 | 1066 | __skb_queue_head_init(&frames); |
948d887d JB |
1067 | |
1068 | /* | |
47086fc5 | 1069 | * Get response frame(s) and more data bit for it. |
948d887d JB |
1070 | */ |
1071 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { | |
4049e09a JB |
1072 | unsigned long tids; |
1073 | ||
47086fc5 | 1074 | if (ignored_acs & BIT(ac)) |
948d887d JB |
1075 | continue; |
1076 | ||
4049e09a JB |
1077 | tids = ieee80211_tids_for_ac(ac); |
1078 | ||
1079 | if (!found) { | |
1080 | driver_release_tids = sta->driver_buffered_tids & tids; | |
1081 | if (driver_release_tids) { | |
1082 | found = true; | |
1083 | } else { | |
47086fc5 JB |
1084 | struct sk_buff *skb; |
1085 | ||
1086 | while (n_frames > 0) { | |
1087 | skb = skb_dequeue(&sta->tx_filtered[ac]); | |
1088 | if (!skb) { | |
1089 | skb = skb_dequeue( | |
1090 | &sta->ps_tx_buf[ac]); | |
1091 | if (skb) | |
1092 | local->total_ps_buffered--; | |
1093 | } | |
1094 | if (!skb) | |
1095 | break; | |
1096 | n_frames--; | |
4049e09a | 1097 | found = true; |
47086fc5 JB |
1098 | __skb_queue_tail(&frames, skb); |
1099 | } | |
948d887d | 1100 | } |
948d887d | 1101 | |
4049e09a JB |
1102 | /* |
1103 | * If the driver has data on more than one TID then | |
1104 | * certainly there's more data if we release just a | |
1105 | * single frame now (from a single TID). | |
1106 | */ | |
47086fc5 JB |
1107 | if (reason == IEEE80211_FRAME_RELEASE_PSPOLL && |
1108 | hweight16(driver_release_tids) > 1) { | |
4049e09a JB |
1109 | more_data = true; |
1110 | driver_release_tids = | |
1111 | BIT(ffs(driver_release_tids) - 1); | |
1112 | break; | |
1113 | } | |
1114 | } | |
948d887d JB |
1115 | |
1116 | if (!skb_queue_empty(&sta->tx_filtered[ac]) || | |
1117 | !skb_queue_empty(&sta->ps_tx_buf[ac])) { | |
1118 | more_data = true; | |
1119 | break; | |
1120 | } | |
af818581 | 1121 | } |
af818581 | 1122 | |
4049e09a | 1123 | if (!found) { |
ce662b44 | 1124 | int tid; |
af818581 JB |
1125 | |
1126 | /* | |
ce662b44 JB |
1127 | * For PS-Poll, this can only happen due to a race condition |
1128 | * when we set the TIM bit and the station notices it, but | |
1129 | * before it can poll for the frame we expire it. | |
1130 | * | |
1131 | * For uAPSD, this is said in the standard (11.2.1.5 h): | |
1132 | * At each unscheduled SP for a non-AP STA, the AP shall | |
1133 | * attempt to transmit at least one MSDU or MMPDU, but no | |
1134 | * more than the value specified in the Max SP Length field | |
1135 | * in the QoS Capability element from delivery-enabled ACs, | |
1136 | * that are destined for the non-AP STA. | |
1137 | * | |
1138 | * Since we have no other MSDU/MMPDU, transmit a QoS null frame. | |
af818581 | 1139 | */ |
af818581 | 1140 | |
ce662b44 JB |
1141 | /* This will evaluate to 1, 3, 5 or 7. */ |
1142 | tid = 7 - ((ffs(~ignored_acs) - 1) << 1); | |
af818581 | 1143 | |
40b96408 | 1144 | ieee80211_send_null_response(sdata, sta, tid, reason); |
4049e09a JB |
1145 | return; |
1146 | } | |
af818581 | 1147 | |
47086fc5 JB |
1148 | if (!driver_release_tids) { |
1149 | struct sk_buff_head pending; | |
1150 | struct sk_buff *skb; | |
40b96408 JB |
1151 | int num = 0; |
1152 | u16 tids = 0; | |
af818581 | 1153 | |
47086fc5 | 1154 | skb_queue_head_init(&pending); |
af818581 | 1155 | |
47086fc5 JB |
1156 | while ((skb = __skb_dequeue(&frames))) { |
1157 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1158 | struct ieee80211_hdr *hdr = (void *) skb->data; | |
40b96408 JB |
1159 | u8 *qoshdr = NULL; |
1160 | ||
1161 | num++; | |
af818581 | 1162 | |
47086fc5 JB |
1163 | /* |
1164 | * Tell TX path to send this frame even though the | |
1165 | * STA may still remain is PS mode after this frame | |
1166 | * exchange. | |
1167 | */ | |
02f2f1a9 | 1168 | info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; |
47086fc5 JB |
1169 | |
1170 | /* | |
1171 | * Use MoreData flag to indicate whether there are | |
1172 | * more buffered frames for this STA | |
1173 | */ | |
24b9c373 | 1174 | if (more_data || !skb_queue_empty(&frames)) |
47086fc5 JB |
1175 | hdr->frame_control |= |
1176 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
24b9c373 JD |
1177 | else |
1178 | hdr->frame_control &= | |
1179 | cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
47086fc5 | 1180 | |
40b96408 JB |
1181 | if (ieee80211_is_data_qos(hdr->frame_control) || |
1182 | ieee80211_is_qos_nullfunc(hdr->frame_control)) | |
1183 | qoshdr = ieee80211_get_qos_ctl(hdr); | |
1184 | ||
52a3f20c MP |
1185 | /* end service period after last frame */ |
1186 | if (skb_queue_empty(&frames)) { | |
1187 | if (reason == IEEE80211_FRAME_RELEASE_UAPSD && | |
1188 | qoshdr) | |
1189 | *qoshdr |= IEEE80211_QOS_CTL_EOSP; | |
1190 | ||
1191 | info->flags |= IEEE80211_TX_STATUS_EOSP | | |
1192 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
1193 | } | |
deeaee19 | 1194 | |
40b96408 JB |
1195 | if (qoshdr) |
1196 | tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK); | |
1197 | else | |
1198 | tids |= BIT(0); | |
1199 | ||
47086fc5 JB |
1200 | __skb_queue_tail(&pending, skb); |
1201 | } | |
af818581 | 1202 | |
40b96408 JB |
1203 | drv_allow_buffered_frames(local, sta, tids, num, |
1204 | reason, more_data); | |
1205 | ||
47086fc5 | 1206 | ieee80211_add_pending_skbs(local, &pending); |
af818581 | 1207 | |
c868cb35 | 1208 | sta_info_recalc_tim(sta); |
af818581 JB |
1209 | } else { |
1210 | /* | |
4049e09a JB |
1211 | * We need to release a frame that is buffered somewhere in the |
1212 | * driver ... it'll have to handle that. | |
1213 | * Note that, as per the comment above, it'll also have to see | |
1214 | * if there is more than just one frame on the specific TID that | |
1215 | * we're releasing from, and it needs to set the more-data bit | |
1216 | * accordingly if we tell it that there's no more data. If we do | |
1217 | * tell it there's more data, then of course the more-data bit | |
1218 | * needs to be set anyway. | |
1219 | */ | |
1220 | drv_release_buffered_frames(local, sta, driver_release_tids, | |
47086fc5 | 1221 | n_frames, reason, more_data); |
4049e09a JB |
1222 | |
1223 | /* | |
1224 | * Note that we don't recalculate the TIM bit here as it would | |
1225 | * most likely have no effect at all unless the driver told us | |
1226 | * that the TID became empty before returning here from the | |
1227 | * release function. | |
1228 | * Either way, however, when the driver tells us that the TID | |
1229 | * became empty we'll do the TIM recalculation. | |
af818581 | 1230 | */ |
af818581 JB |
1231 | } |
1232 | } | |
1233 | ||
47086fc5 JB |
1234 | void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) |
1235 | { | |
1236 | u8 ignore_for_response = sta->sta.uapsd_queues; | |
1237 | ||
1238 | /* | |
1239 | * If all ACs are delivery-enabled then we should reply | |
1240 | * from any of them, if only some are enabled we reply | |
1241 | * only from the non-enabled ones. | |
1242 | */ | |
1243 | if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1) | |
1244 | ignore_for_response = 0; | |
1245 | ||
1246 | ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response, | |
1247 | IEEE80211_FRAME_RELEASE_PSPOLL); | |
1248 | } | |
1249 | ||
1250 | void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta) | |
1251 | { | |
1252 | int n_frames = sta->sta.max_sp; | |
1253 | u8 delivery_enabled = sta->sta.uapsd_queues; | |
1254 | ||
1255 | /* | |
1256 | * If we ever grow support for TSPEC this might happen if | |
1257 | * the TSPEC update from hostapd comes in between a trigger | |
1258 | * frame setting WLAN_STA_UAPSD in the RX path and this | |
1259 | * actually getting called. | |
1260 | */ | |
1261 | if (!delivery_enabled) | |
1262 | return; | |
1263 | ||
47086fc5 JB |
1264 | switch (sta->sta.max_sp) { |
1265 | case 1: | |
1266 | n_frames = 2; | |
1267 | break; | |
1268 | case 2: | |
1269 | n_frames = 4; | |
1270 | break; | |
1271 | case 3: | |
1272 | n_frames = 6; | |
1273 | break; | |
1274 | case 0: | |
1275 | /* XXX: what is a good value? */ | |
1276 | n_frames = 8; | |
1277 | break; | |
1278 | } | |
1279 | ||
1280 | ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled, | |
1281 | IEEE80211_FRAME_RELEASE_UAPSD); | |
1282 | } | |
1283 | ||
af818581 JB |
1284 | void ieee80211_sta_block_awake(struct ieee80211_hw *hw, |
1285 | struct ieee80211_sta *pubsta, bool block) | |
1286 | { | |
1287 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
1288 | ||
b5878a2d JB |
1289 | trace_api_sta_block_awake(sta->local, pubsta, block); |
1290 | ||
af818581 | 1291 | if (block) |
c2c98fde JB |
1292 | set_sta_flag(sta, WLAN_STA_PS_DRIVER); |
1293 | else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) | |
af818581 JB |
1294 | ieee80211_queue_work(hw, &sta->drv_unblock_wk); |
1295 | } | |
1296 | EXPORT_SYMBOL(ieee80211_sta_block_awake); | |
dcf55fb5 | 1297 | |
37fbd908 JB |
1298 | void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta) |
1299 | { | |
1300 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
1301 | struct ieee80211_local *local = sta->local; | |
1302 | struct sk_buff *skb; | |
1303 | struct skb_eosp_msg_data *data; | |
1304 | ||
1305 | trace_api_eosp(local, pubsta); | |
1306 | ||
1307 | skb = alloc_skb(0, GFP_ATOMIC); | |
1308 | if (!skb) { | |
1309 | /* too bad ... but race is better than loss */ | |
1310 | clear_sta_flag(sta, WLAN_STA_SP); | |
1311 | return; | |
1312 | } | |
1313 | ||
1314 | data = (void *)skb->cb; | |
1315 | memcpy(data->sta, pubsta->addr, ETH_ALEN); | |
1316 | memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN); | |
1317 | skb->pkt_type = IEEE80211_EOSP_MSG; | |
1318 | skb_queue_tail(&local->skb_queue, skb); | |
1319 | tasklet_schedule(&local->tasklet); | |
1320 | } | |
1321 | EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe); | |
1322 | ||
042ec453 JB |
1323 | void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta, |
1324 | u8 tid, bool buffered) | |
dcf55fb5 FF |
1325 | { |
1326 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
1327 | ||
948d887d | 1328 | if (WARN_ON(tid >= STA_TID_NUM)) |
042ec453 JB |
1329 | return; |
1330 | ||
948d887d JB |
1331 | if (buffered) |
1332 | set_bit(tid, &sta->driver_buffered_tids); | |
1333 | else | |
1334 | clear_bit(tid, &sta->driver_buffered_tids); | |
1335 | ||
c868cb35 | 1336 | sta_info_recalc_tim(sta); |
dcf55fb5 | 1337 | } |
042ec453 | 1338 | EXPORT_SYMBOL(ieee80211_sta_set_buffered); |
d9a7ddb0 | 1339 | |
83d5cc01 JB |
1340 | int sta_info_move_state(struct sta_info *sta, |
1341 | enum ieee80211_sta_state new_state) | |
d9a7ddb0 | 1342 | { |
8bf11d8d | 1343 | might_sleep(); |
d9a7ddb0 JB |
1344 | |
1345 | if (sta->sta_state == new_state) | |
1346 | return 0; | |
1347 | ||
f09603a2 JB |
1348 | /* check allowed transitions first */ |
1349 | ||
1350 | switch (new_state) { | |
1351 | case IEEE80211_STA_NONE: | |
1352 | if (sta->sta_state != IEEE80211_STA_AUTH) | |
1353 | return -EINVAL; | |
1354 | break; | |
1355 | case IEEE80211_STA_AUTH: | |
1356 | if (sta->sta_state != IEEE80211_STA_NONE && | |
1357 | sta->sta_state != IEEE80211_STA_ASSOC) | |
1358 | return -EINVAL; | |
1359 | break; | |
1360 | case IEEE80211_STA_ASSOC: | |
1361 | if (sta->sta_state != IEEE80211_STA_AUTH && | |
1362 | sta->sta_state != IEEE80211_STA_AUTHORIZED) | |
1363 | return -EINVAL; | |
1364 | break; | |
1365 | case IEEE80211_STA_AUTHORIZED: | |
1366 | if (sta->sta_state != IEEE80211_STA_ASSOC) | |
1367 | return -EINVAL; | |
1368 | break; | |
1369 | default: | |
1370 | WARN(1, "invalid state %d", new_state); | |
1371 | return -EINVAL; | |
1372 | } | |
1373 | ||
bdcbd8e0 JB |
1374 | sta_dbg(sta->sdata, "moving STA %pM to state %d\n", |
1375 | sta->sta.addr, new_state); | |
f09603a2 JB |
1376 | |
1377 | /* | |
1378 | * notify the driver before the actual changes so it can | |
1379 | * fail the transition | |
1380 | */ | |
1381 | if (test_sta_flag(sta, WLAN_STA_INSERTED)) { | |
1382 | int err = drv_sta_state(sta->local, sta->sdata, sta, | |
1383 | sta->sta_state, new_state); | |
1384 | if (err) | |
1385 | return err; | |
1386 | } | |
1387 | ||
1388 | /* reflect the change in all state variables */ | |
1389 | ||
d9a7ddb0 JB |
1390 | switch (new_state) { |
1391 | case IEEE80211_STA_NONE: | |
1392 | if (sta->sta_state == IEEE80211_STA_AUTH) | |
1393 | clear_bit(WLAN_STA_AUTH, &sta->_flags); | |
d9a7ddb0 JB |
1394 | break; |
1395 | case IEEE80211_STA_AUTH: | |
1396 | if (sta->sta_state == IEEE80211_STA_NONE) | |
1397 | set_bit(WLAN_STA_AUTH, &sta->_flags); | |
1398 | else if (sta->sta_state == IEEE80211_STA_ASSOC) | |
1399 | clear_bit(WLAN_STA_ASSOC, &sta->_flags); | |
d9a7ddb0 JB |
1400 | break; |
1401 | case IEEE80211_STA_ASSOC: | |
29623892 | 1402 | if (sta->sta_state == IEEE80211_STA_AUTH) { |
d9a7ddb0 | 1403 | set_bit(WLAN_STA_ASSOC, &sta->_flags); |
29623892 | 1404 | } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) { |
7e3ed02c FF |
1405 | if (sta->sdata->vif.type == NL80211_IFTYPE_AP || |
1406 | (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1407 | !sta->sdata->u.vlan.sta)) | |
1408 | atomic_dec(&sta->sdata->bss->num_mcast_sta); | |
d9a7ddb0 | 1409 | clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags); |
f09603a2 | 1410 | } |
d9a7ddb0 JB |
1411 | break; |
1412 | case IEEE80211_STA_AUTHORIZED: | |
29623892 | 1413 | if (sta->sta_state == IEEE80211_STA_ASSOC) { |
7e3ed02c FF |
1414 | if (sta->sdata->vif.type == NL80211_IFTYPE_AP || |
1415 | (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1416 | !sta->sdata->u.vlan.sta)) | |
1417 | atomic_inc(&sta->sdata->bss->num_mcast_sta); | |
d9a7ddb0 | 1418 | set_bit(WLAN_STA_AUTHORIZED, &sta->_flags); |
f09603a2 | 1419 | } |
d9a7ddb0 JB |
1420 | break; |
1421 | default: | |
f09603a2 | 1422 | break; |
d9a7ddb0 JB |
1423 | } |
1424 | ||
d9a7ddb0 JB |
1425 | sta->sta_state = new_state; |
1426 | ||
1427 | return 0; | |
1428 | } |