Commit | Line | Data |
---|---|---|
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 | ||
b22cfcfc EP |
94 | static void free_sta_work(struct work_struct *wk) |
95 | { | |
96 | struct sta_info *sta = container_of(wk, struct sta_info, free_sta_wk); | |
97 | int ac, i; | |
98 | struct tid_ampdu_tx *tid_tx; | |
99 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
100 | struct ieee80211_local *local = sdata->local; | |
101 | ||
102 | /* | |
103 | * At this point, when being called as call_rcu callback, | |
104 | * neither mac80211 nor the driver can reference this | |
105 | * sta struct any more except by still existing timers | |
106 | * associated with this station that we clean up below. | |
107 | */ | |
108 | ||
109 | if (test_sta_flag(sta, WLAN_STA_PS_STA)) { | |
110 | BUG_ON(!sdata->bss); | |
111 | ||
112 | clear_sta_flag(sta, WLAN_STA_PS_STA); | |
113 | ||
114 | atomic_dec(&sdata->bss->num_sta_ps); | |
115 | sta_info_recalc_tim(sta); | |
116 | } | |
117 | ||
118 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { | |
119 | local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]); | |
120 | __skb_queue_purge(&sta->ps_tx_buf[ac]); | |
121 | __skb_queue_purge(&sta->tx_filtered[ac]); | |
122 | } | |
123 | ||
124 | #ifdef CONFIG_MAC80211_MESH | |
125 | if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
126 | mesh_accept_plinks_update(sdata); | |
127 | mesh_plink_deactivate(sta); | |
128 | del_timer_sync(&sta->plink_timer); | |
129 | } | |
130 | #endif | |
131 | ||
132 | cancel_work_sync(&sta->drv_unblock_wk); | |
133 | ||
134 | /* | |
135 | * Destroy aggregation state here. It would be nice to wait for the | |
136 | * driver to finish aggregation stop and then clean up, but for now | |
137 | * drivers have to handle aggregation stop being requested, followed | |
138 | * directly by station destruction. | |
139 | */ | |
140 | for (i = 0; i < STA_TID_NUM; i++) { | |
141 | tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]); | |
142 | if (!tid_tx) | |
143 | continue; | |
144 | __skb_queue_purge(&tid_tx->pending); | |
145 | kfree(tid_tx); | |
146 | } | |
147 | ||
148 | sta_info_free(local, sta); | |
149 | } | |
150 | ||
151 | static void free_sta_rcu(struct rcu_head *h) | |
152 | { | |
153 | struct sta_info *sta = container_of(h, struct sta_info, rcu_head); | |
154 | ||
155 | ieee80211_queue_work(&sta->local->hw, &sta->free_sta_wk); | |
156 | } | |
157 | ||
d0709a65 | 158 | /* protected by RCU */ |
abe60632 JB |
159 | struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, |
160 | const u8 *addr) | |
f0706e82 | 161 | { |
abe60632 | 162 | struct ieee80211_local *local = sdata->local; |
f0706e82 JB |
163 | struct sta_info *sta; |
164 | ||
0379185b | 165 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
0379185b | 166 | lockdep_is_held(&local->sta_mtx)); |
f0706e82 | 167 | while (sta) { |
abe60632 | 168 | if (sta->sdata == sdata && |
b203ca39 | 169 | ether_addr_equal(sta->sta.addr, addr)) |
f0706e82 | 170 | break; |
0379185b | 171 | sta = rcu_dereference_check(sta->hnext, |
0379185b | 172 | lockdep_is_held(&local->sta_mtx)); |
f0706e82 | 173 | } |
43ba7e95 JB |
174 | return sta; |
175 | } | |
176 | ||
0e5ded5a FF |
177 | /* |
178 | * Get sta info either from the specified interface | |
179 | * or from one of its vlans | |
180 | */ | |
181 | struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, | |
182 | const u8 *addr) | |
183 | { | |
184 | struct ieee80211_local *local = sdata->local; | |
185 | struct sta_info *sta; | |
186 | ||
0379185b | 187 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
0379185b | 188 | lockdep_is_held(&local->sta_mtx)); |
0e5ded5a FF |
189 | while (sta) { |
190 | if ((sta->sdata == sdata || | |
a2c1e3da | 191 | (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && |
b203ca39 | 192 | ether_addr_equal(sta->sta.addr, addr)) |
0e5ded5a | 193 | break; |
0379185b | 194 | sta = rcu_dereference_check(sta->hnext, |
0379185b | 195 | lockdep_is_held(&local->sta_mtx)); |
0e5ded5a FF |
196 | } |
197 | return sta; | |
198 | } | |
199 | ||
3b53fde8 JB |
200 | struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, |
201 | int idx) | |
ee385855 | 202 | { |
3b53fde8 | 203 | struct ieee80211_local *local = sdata->local; |
ee385855 LCC |
204 | struct sta_info *sta; |
205 | int i = 0; | |
206 | ||
d0709a65 | 207 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
3b53fde8 | 208 | if (sdata != sta->sdata) |
2a8ca29a | 209 | continue; |
ee385855 LCC |
210 | if (i < idx) { |
211 | ++i; | |
212 | continue; | |
ee385855 | 213 | } |
2a8ca29a | 214 | return sta; |
ee385855 | 215 | } |
ee385855 LCC |
216 | |
217 | return NULL; | |
218 | } | |
f0706e82 | 219 | |
93e5deb1 | 220 | /** |
d9a7ddb0 | 221 | * sta_info_free - free STA |
93e5deb1 | 222 | * |
6ef307bc | 223 | * @local: pointer to the global information |
93e5deb1 JB |
224 | * @sta: STA info to free |
225 | * | |
226 | * This function must undo everything done by sta_info_alloc() | |
d9a7ddb0 JB |
227 | * that may happen before sta_info_insert(). It may only be |
228 | * called when sta_info_insert() has not been attempted (and | |
229 | * if that fails, the station is freed anyway.) | |
93e5deb1 | 230 | */ |
d9a7ddb0 | 231 | void sta_info_free(struct ieee80211_local *local, struct sta_info *sta) |
93e5deb1 | 232 | { |
889cbb91 | 233 | if (sta->rate_ctrl) |
af65cd96 | 234 | rate_control_free_sta(sta); |
93e5deb1 | 235 | |
bdcbd8e0 | 236 | sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr); |
93e5deb1 JB |
237 | |
238 | kfree(sta); | |
239 | } | |
240 | ||
4d33960b | 241 | /* Caller must hold local->sta_mtx */ |
d0709a65 JB |
242 | static void sta_info_hash_add(struct ieee80211_local *local, |
243 | struct sta_info *sta) | |
f0706e82 | 244 | { |
4d33960b | 245 | lockdep_assert_held(&local->sta_mtx); |
17741cdc | 246 | sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; |
cf778b00 | 247 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); |
f0706e82 | 248 | } |
f0706e82 | 249 | |
af818581 JB |
250 | static void sta_unblock(struct work_struct *wk) |
251 | { | |
252 | struct sta_info *sta; | |
253 | ||
254 | sta = container_of(wk, struct sta_info, drv_unblock_wk); | |
255 | ||
256 | if (sta->dead) | |
257 | return; | |
258 | ||
54420473 HS |
259 | if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { |
260 | local_bh_disable(); | |
af818581 | 261 | ieee80211_sta_ps_deliver_wakeup(sta); |
54420473 HS |
262 | local_bh_enable(); |
263 | } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) { | |
c2c98fde | 264 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
ce662b44 JB |
265 | |
266 | local_bh_disable(); | |
af818581 | 267 | ieee80211_sta_ps_deliver_poll_response(sta); |
ce662b44 | 268 | local_bh_enable(); |
c2c98fde JB |
269 | } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) { |
270 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); | |
ce662b44 JB |
271 | |
272 | local_bh_disable(); | |
47086fc5 | 273 | ieee80211_sta_ps_deliver_uapsd(sta); |
ce662b44 | 274 | local_bh_enable(); |
50a9432d | 275 | } else |
c2c98fde | 276 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
af818581 JB |
277 | } |
278 | ||
af65cd96 JB |
279 | static int sta_prepare_rate_control(struct ieee80211_local *local, |
280 | struct sta_info *sta, gfp_t gfp) | |
281 | { | |
282 | if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) | |
283 | return 0; | |
284 | ||
889cbb91 | 285 | sta->rate_ctrl = local->rate_ctrl; |
af65cd96 JB |
286 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, |
287 | &sta->sta, gfp); | |
889cbb91 | 288 | if (!sta->rate_ctrl_priv) |
af65cd96 | 289 | return -ENOMEM; |
af65cd96 JB |
290 | |
291 | return 0; | |
292 | } | |
293 | ||
73651ee6 | 294 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
56544160 | 295 | const u8 *addr, gfp_t gfp) |
f0706e82 | 296 | { |
d0709a65 | 297 | struct ieee80211_local *local = sdata->local; |
f0706e82 | 298 | struct sta_info *sta; |
ebe27c91 | 299 | struct timespec uptime; |
16c5f15c | 300 | int i; |
f0706e82 | 301 | |
17741cdc | 302 | sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); |
f0706e82 | 303 | if (!sta) |
73651ee6 | 304 | return NULL; |
f0706e82 | 305 | |
07346f81 | 306 | spin_lock_init(&sta->lock); |
af818581 | 307 | INIT_WORK(&sta->drv_unblock_wk, sta_unblock); |
b22cfcfc | 308 | INIT_WORK(&sta->free_sta_wk, free_sta_work); |
67c282c0 | 309 | INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); |
a93e3644 | 310 | mutex_init(&sta->ampdu_mlme.mtx); |
07346f81 | 311 | |
17741cdc | 312 | memcpy(sta->sta.addr, addr, ETH_ALEN); |
d0709a65 JB |
313 | sta->local = local; |
314 | sta->sdata = sdata; | |
8bc8aecd | 315 | sta->last_rx = jiffies; |
f0706e82 | 316 | |
71ec375c JB |
317 | sta->sta_state = IEEE80211_STA_NONE; |
318 | ||
ebe27c91 MSS |
319 | do_posix_clock_monotonic_gettime(&uptime); |
320 | sta->last_connected = uptime.tv_sec; | |
541a45a1 BR |
321 | ewma_init(&sta->avg_signal, 1024, 8); |
322 | ||
af65cd96 | 323 | if (sta_prepare_rate_control(local, sta, gfp)) { |
f0706e82 | 324 | kfree(sta); |
73651ee6 | 325 | return NULL; |
f0706e82 JB |
326 | } |
327 | ||
16c5f15c | 328 | for (i = 0; i < STA_TID_NUM; i++) { |
a622ab72 JB |
329 | /* |
330 | * timer_to_tid must be initialized with identity mapping | |
331 | * to enable session_timer's data differentiation. See | |
332 | * sta_rx_agg_session_timer_expired for usage. | |
333 | */ | |
16c5f15c | 334 | sta->timer_to_tid[i] = i; |
16c5f15c | 335 | } |
948d887d JB |
336 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { |
337 | skb_queue_head_init(&sta->ps_tx_buf[i]); | |
338 | skb_queue_head_init(&sta->tx_filtered[i]); | |
339 | } | |
73651ee6 | 340 | |
cccaec98 | 341 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) |
4be929be | 342 | sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); |
cccaec98 | 343 | |
bdcbd8e0 | 344 | sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr); |
73651ee6 | 345 | |
03e4497e | 346 | #ifdef CONFIG_MAC80211_MESH |
57cf8043 | 347 | sta->plink_state = NL80211_PLINK_LISTEN; |
03e4497e JB |
348 | init_timer(&sta->plink_timer); |
349 | #endif | |
350 | ||
73651ee6 JB |
351 | return sta; |
352 | } | |
353 | ||
8c71df7a | 354 | static int sta_info_insert_check(struct sta_info *sta) |
34e89507 | 355 | { |
34e89507 | 356 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
34e89507 | 357 | |
03e4497e JB |
358 | /* |
359 | * Can't be a WARN_ON because it can be triggered through a race: | |
360 | * something inserts a STA (on one CPU) without holding the RTNL | |
361 | * and another CPU turns off the net device. | |
362 | */ | |
8c71df7a GE |
363 | if (unlikely(!ieee80211_sdata_running(sdata))) |
364 | return -ENETDOWN; | |
03e4497e | 365 | |
b203ca39 | 366 | if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) || |
8c71df7a GE |
367 | is_multicast_ether_addr(sta->sta.addr))) |
368 | return -EINVAL; | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
f09603a2 JB |
373 | static int sta_info_insert_drv_state(struct ieee80211_local *local, |
374 | struct ieee80211_sub_if_data *sdata, | |
375 | struct sta_info *sta) | |
376 | { | |
377 | enum ieee80211_sta_state state; | |
378 | int err = 0; | |
379 | ||
380 | for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) { | |
381 | err = drv_sta_state(local, sdata, sta, state, state + 1); | |
382 | if (err) | |
383 | break; | |
384 | } | |
385 | ||
386 | if (!err) { | |
a4ec45a4 JB |
387 | /* |
388 | * Drivers using legacy sta_add/sta_remove callbacks only | |
389 | * get uploaded set to true after sta_add is called. | |
390 | */ | |
391 | if (!local->ops->sta_add) | |
392 | sta->uploaded = true; | |
f09603a2 JB |
393 | return 0; |
394 | } | |
395 | ||
396 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
bdcbd8e0 JB |
397 | sdata_info(sdata, |
398 | "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n", | |
399 | sta->sta.addr, state + 1, err); | |
f09603a2 JB |
400 | err = 0; |
401 | } | |
402 | ||
403 | /* unwind on error */ | |
404 | for (; state > IEEE80211_STA_NOTEXIST; state--) | |
405 | WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1)); | |
406 | ||
407 | return err; | |
408 | } | |
409 | ||
8c71df7a GE |
410 | /* |
411 | * should be called with sta_mtx locked | |
412 | * this function replaces the mutex lock | |
413 | * with a RCU lock | |
414 | */ | |
4d33960b | 415 | static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU) |
8c71df7a GE |
416 | { |
417 | struct ieee80211_local *local = sta->local; | |
418 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
7852e361 | 419 | struct station_info sinfo; |
8c71df7a GE |
420 | int err = 0; |
421 | ||
422 | lockdep_assert_held(&local->sta_mtx); | |
34e89507 | 423 | |
7852e361 JB |
424 | /* check if STA exists already */ |
425 | if (sta_info_get_bss(sdata, sta->sta.addr)) { | |
426 | err = -EEXIST; | |
427 | goto out_err; | |
4d33960b | 428 | } |
32bfd35d | 429 | |
7852e361 JB |
430 | /* notify driver */ |
431 | err = sta_info_insert_drv_state(local, sdata, sta); | |
432 | if (err) | |
433 | goto out_err; | |
4d33960b | 434 | |
7852e361 JB |
435 | local->num_sta++; |
436 | local->sta_generation++; | |
437 | smp_mb(); | |
4d33960b | 438 | |
7852e361 JB |
439 | /* make the station visible */ |
440 | sta_info_hash_add(local, sta); | |
83d5cc01 | 441 | |
794454ce | 442 | list_add_rcu(&sta->list, &local->sta_list); |
4d33960b | 443 | |
7852e361 | 444 | set_sta_flag(sta, WLAN_STA_INSERTED); |
4d33960b | 445 | |
7852e361 JB |
446 | ieee80211_sta_debugfs_add(sta); |
447 | rate_control_add_sta_debugfs(sta); | |
4d33960b | 448 | |
7852e361 JB |
449 | memset(&sinfo, 0, sizeof(sinfo)); |
450 | sinfo.filled = 0; | |
451 | sinfo.generation = local->sta_generation; | |
452 | cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); | |
d0709a65 | 453 | |
bdcbd8e0 | 454 | sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr); |
f0706e82 | 455 | |
34e89507 JB |
456 | /* move reference to rcu-protected */ |
457 | rcu_read_lock(); | |
458 | mutex_unlock(&local->sta_mtx); | |
e9f207f0 | 459 | |
73651ee6 JB |
460 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
461 | mesh_accept_plinks_update(sdata); | |
462 | ||
8c71df7a | 463 | return 0; |
4d33960b JB |
464 | out_err: |
465 | mutex_unlock(&local->sta_mtx); | |
466 | rcu_read_lock(); | |
467 | return err; | |
8c71df7a GE |
468 | } |
469 | ||
470 | int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) | |
471 | { | |
472 | struct ieee80211_local *local = sta->local; | |
8c71df7a GE |
473 | int err = 0; |
474 | ||
4d33960b JB |
475 | might_sleep(); |
476 | ||
8c71df7a GE |
477 | err = sta_info_insert_check(sta); |
478 | if (err) { | |
479 | rcu_read_lock(); | |
480 | goto out_free; | |
481 | } | |
482 | ||
8c71df7a GE |
483 | mutex_lock(&local->sta_mtx); |
484 | ||
4d33960b | 485 | err = sta_info_insert_finish(sta); |
8c71df7a GE |
486 | if (err) |
487 | goto out_free; | |
488 | ||
73651ee6 | 489 | return 0; |
93e5deb1 JB |
490 | out_free: |
491 | BUG_ON(!err); | |
d9a7ddb0 | 492 | sta_info_free(local, sta); |
93e5deb1 | 493 | return err; |
f0706e82 JB |
494 | } |
495 | ||
34e89507 JB |
496 | int sta_info_insert(struct sta_info *sta) |
497 | { | |
498 | int err = sta_info_insert_rcu(sta); | |
499 | ||
500 | rcu_read_unlock(); | |
501 | ||
502 | return err; | |
503 | } | |
504 | ||
004c872e JB |
505 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
506 | { | |
507 | /* | |
508 | * This format has been mandated by the IEEE specifications, | |
509 | * so this line may not be changed to use the __set_bit() format. | |
510 | */ | |
511 | bss->tim[aid / 8] |= (1 << (aid % 8)); | |
512 | } | |
513 | ||
514 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) | |
515 | { | |
516 | /* | |
517 | * This format has been mandated by the IEEE specifications, | |
518 | * so this line may not be changed to use the __clear_bit() format. | |
519 | */ | |
520 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); | |
521 | } | |
522 | ||
948d887d | 523 | static unsigned long ieee80211_tids_for_ac(int ac) |
004c872e | 524 | { |
948d887d JB |
525 | /* If we ever support TIDs > 7, this obviously needs to be adjusted */ |
526 | switch (ac) { | |
527 | case IEEE80211_AC_VO: | |
528 | return BIT(6) | BIT(7); | |
529 | case IEEE80211_AC_VI: | |
530 | return BIT(4) | BIT(5); | |
531 | case IEEE80211_AC_BE: | |
532 | return BIT(0) | BIT(3); | |
533 | case IEEE80211_AC_BK: | |
534 | return BIT(1) | BIT(2); | |
535 | default: | |
536 | WARN_ON(1); | |
537 | return 0; | |
d0709a65 | 538 | } |
004c872e JB |
539 | } |
540 | ||
c868cb35 | 541 | void sta_info_recalc_tim(struct sta_info *sta) |
004c872e | 542 | { |
c868cb35 JB |
543 | struct ieee80211_local *local = sta->local; |
544 | struct ieee80211_if_ap *bss = sta->sdata->bss; | |
d0709a65 | 545 | unsigned long flags; |
948d887d JB |
546 | bool indicate_tim = false; |
547 | u8 ignore_for_tim = sta->sta.uapsd_queues; | |
548 | int ac; | |
004c872e | 549 | |
c868cb35 JB |
550 | if (WARN_ON_ONCE(!sta->sdata->bss)) |
551 | return; | |
3e122be0 | 552 | |
c868cb35 JB |
553 | /* No need to do anything if the driver does all */ |
554 | if (local->hw.flags & IEEE80211_HW_AP_LINK_PS) | |
555 | return; | |
004c872e | 556 | |
c868cb35 JB |
557 | if (sta->dead) |
558 | goto done; | |
3e122be0 | 559 | |
948d887d JB |
560 | /* |
561 | * If all ACs are delivery-enabled then we should build | |
562 | * the TIM bit for all ACs anyway; if only some are then | |
563 | * we ignore those and build the TIM bit using only the | |
564 | * non-enabled ones. | |
565 | */ | |
566 | if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1) | |
567 | ignore_for_tim = 0; | |
568 | ||
569 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { | |
570 | unsigned long tids; | |
3e122be0 | 571 | |
948d887d JB |
572 | if (ignore_for_tim & BIT(ac)) |
573 | continue; | |
574 | ||
575 | indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) || | |
576 | !skb_queue_empty(&sta->ps_tx_buf[ac]); | |
577 | if (indicate_tim) | |
578 | break; | |
3e122be0 | 579 | |
948d887d JB |
580 | tids = ieee80211_tids_for_ac(ac); |
581 | ||
582 | indicate_tim |= | |
583 | sta->driver_buffered_tids & tids; | |
d0709a65 | 584 | } |
004c872e | 585 | |
c868cb35 | 586 | done: |
4d33960b | 587 | spin_lock_irqsave(&local->tim_lock, flags); |
004c872e | 588 | |
948d887d | 589 | if (indicate_tim) |
c868cb35 JB |
590 | __bss_tim_set(bss, sta->sta.aid); |
591 | else | |
592 | __bss_tim_clear(bss, sta->sta.aid); | |
004c872e | 593 | |
c868cb35 JB |
594 | if (local->ops->set_tim) { |
595 | local->tim_in_locked_section = true; | |
948d887d | 596 | drv_set_tim(local, &sta->sta, indicate_tim); |
c868cb35 JB |
597 | local->tim_in_locked_section = false; |
598 | } | |
3e122be0 | 599 | |
4d33960b | 600 | spin_unlock_irqrestore(&local->tim_lock, flags); |
004c872e JB |
601 | } |
602 | ||
cd0b8d89 | 603 | static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb) |
f0706e82 | 604 | { |
e039fa4a | 605 | struct ieee80211_tx_info *info; |
f0706e82 JB |
606 | int timeout; |
607 | ||
608 | if (!skb) | |
cd0b8d89 | 609 | return false; |
f0706e82 | 610 | |
e039fa4a | 611 | info = IEEE80211_SKB_CB(skb); |
f0706e82 JB |
612 | |
613 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ | |
57c4d7b4 JB |
614 | timeout = (sta->listen_interval * |
615 | sta->sdata->vif.bss_conf.beacon_int * | |
616 | 32 / 15625) * HZ; | |
f0706e82 JB |
617 | if (timeout < STA_TX_BUFFER_EXPIRE) |
618 | timeout = STA_TX_BUFFER_EXPIRE; | |
e039fa4a | 619 | return time_after(jiffies, info->control.jiffies + timeout); |
f0706e82 JB |
620 | } |
621 | ||
622 | ||
948d887d JB |
623 | static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local, |
624 | struct sta_info *sta, int ac) | |
f0706e82 JB |
625 | { |
626 | unsigned long flags; | |
627 | struct sk_buff *skb; | |
628 | ||
60750397 JB |
629 | /* |
630 | * First check for frames that should expire on the filtered | |
631 | * queue. Frames here were rejected by the driver and are on | |
632 | * a separate queue to avoid reordering with normal PS-buffered | |
633 | * frames. They also aren't accounted for right now in the | |
634 | * total_ps_buffered counter. | |
635 | */ | |
636 | for (;;) { | |
948d887d JB |
637 | spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); |
638 | skb = skb_peek(&sta->tx_filtered[ac]); | |
60750397 | 639 | if (sta_info_buffer_expired(sta, skb)) |
948d887d | 640 | skb = __skb_dequeue(&sta->tx_filtered[ac]); |
60750397 JB |
641 | else |
642 | skb = NULL; | |
948d887d | 643 | spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); |
60750397 JB |
644 | |
645 | /* | |
646 | * Frames are queued in order, so if this one | |
647 | * hasn't expired yet we can stop testing. If | |
648 | * we actually reached the end of the queue we | |
649 | * also need to stop, of course. | |
650 | */ | |
651 | if (!skb) | |
652 | break; | |
653 | dev_kfree_skb(skb); | |
654 | } | |
655 | ||
656 | /* | |
657 | * Now also check the normal PS-buffered queue, this will | |
658 | * only find something if the filtered queue was emptied | |
659 | * since the filtered frames are all before the normal PS | |
660 | * buffered frames. | |
661 | */ | |
f0706e82 | 662 | for (;;) { |
948d887d JB |
663 | spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); |
664 | skb = skb_peek(&sta->ps_tx_buf[ac]); | |
57c4d7b4 | 665 | if (sta_info_buffer_expired(sta, skb)) |
948d887d | 666 | skb = __skb_dequeue(&sta->ps_tx_buf[ac]); |
836341a7 | 667 | else |
f0706e82 | 668 | skb = NULL; |
948d887d | 669 | spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); |
f0706e82 | 670 | |
60750397 JB |
671 | /* |
672 | * frames are queued in order, so if this one | |
673 | * hasn't expired yet (or we reached the end of | |
674 | * the queue) we can stop testing | |
675 | */ | |
836341a7 | 676 | if (!skb) |
f0706e82 | 677 | break; |
836341a7 | 678 | |
836341a7 | 679 | local->total_ps_buffered--; |
bdcbd8e0 JB |
680 | ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n", |
681 | sta->sta.addr); | |
836341a7 | 682 | dev_kfree_skb(skb); |
f0706e82 | 683 | } |
3393a608 | 684 | |
60750397 JB |
685 | /* |
686 | * Finally, recalculate the TIM bit for this station -- it might | |
687 | * now be clear because the station was too slow to retrieve its | |
688 | * frames. | |
689 | */ | |
690 | sta_info_recalc_tim(sta); | |
691 | ||
692 | /* | |
693 | * Return whether there are any frames still buffered, this is | |
694 | * used to check whether the cleanup timer still needs to run, | |
695 | * if there are no frames we don't need to rearm the timer. | |
696 | */ | |
948d887d JB |
697 | return !(skb_queue_empty(&sta->ps_tx_buf[ac]) && |
698 | skb_queue_empty(&sta->tx_filtered[ac])); | |
699 | } | |
700 | ||
701 | static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, | |
702 | struct sta_info *sta) | |
703 | { | |
704 | bool have_buffered = false; | |
705 | int ac; | |
706 | ||
707 | /* This is only necessary for stations on BSS interfaces */ | |
708 | if (!sta->sdata->bss) | |
709 | return false; | |
710 | ||
711 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) | |
712 | have_buffered |= | |
713 | sta_info_cleanup_expire_buffered_ac(local, sta, ac); | |
714 | ||
715 | return have_buffered; | |
f0706e82 JB |
716 | } |
717 | ||
83d5cc01 | 718 | int __must_check __sta_info_destroy(struct sta_info *sta) |
f0706e82 | 719 | { |
34e89507 JB |
720 | struct ieee80211_local *local; |
721 | struct ieee80211_sub_if_data *sdata; | |
b22cfcfc | 722 | int ret, i; |
f0706e82 | 723 | |
34e89507 | 724 | might_sleep(); |
f0706e82 | 725 | |
34e89507 JB |
726 | if (!sta) |
727 | return -ENOENT; | |
5bb644a0 | 728 | |
34e89507 JB |
729 | local = sta->local; |
730 | sdata = sta->sdata; | |
f0706e82 | 731 | |
83d5cc01 JB |
732 | lockdep_assert_held(&local->sta_mtx); |
733 | ||
098a6070 JB |
734 | /* |
735 | * Before removing the station from the driver and | |
736 | * rate control, it might still start new aggregation | |
737 | * sessions -- block that to make sure the tear-down | |
738 | * will be sufficient. | |
739 | */ | |
c2c98fde | 740 | set_sta_flag(sta, WLAN_STA_BLOCK_BA); |
582bb505 | 741 | ieee80211_sta_tear_down_BA_sessions(sta, false); |
098a6070 | 742 | |
34e89507 | 743 | ret = sta_info_hash_del(local, sta); |
34e89507 JB |
744 | if (ret) |
745 | return ret; | |
746 | ||
794454ce | 747 | list_del_rcu(&sta->list); |
4d33960b | 748 | |
8cb23153 | 749 | mutex_lock(&local->key_mtx); |
e31b8213 | 750 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) |
40b275b6 | 751 | __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i])); |
e31b8213 | 752 | if (sta->ptk) |
40b275b6 | 753 | __ieee80211_key_free(key_mtx_dereference(local, sta->ptk)); |
8cb23153 | 754 | mutex_unlock(&local->key_mtx); |
34e89507 JB |
755 | |
756 | sta->dead = true; | |
757 | ||
34e89507 JB |
758 | local->num_sta--; |
759 | local->sta_generation++; | |
760 | ||
761 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
a9b3cd7f | 762 | RCU_INIT_POINTER(sdata->u.vlan.sta, NULL); |
34e89507 | 763 | |
83d5cc01 | 764 | while (sta->sta_state > IEEE80211_STA_NONE) { |
f09603a2 JB |
765 | ret = sta_info_move_state(sta, sta->sta_state - 1); |
766 | if (ret) { | |
83d5cc01 JB |
767 | WARN_ON_ONCE(1); |
768 | break; | |
769 | } | |
770 | } | |
d9a7ddb0 | 771 | |
f09603a2 | 772 | if (sta->uploaded) { |
f09603a2 JB |
773 | ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE, |
774 | IEEE80211_STA_NOTEXIST); | |
775 | WARN_ON_ONCE(ret != 0); | |
776 | } | |
34e89507 | 777 | |
bdcbd8e0 JB |
778 | sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr); |
779 | ||
ec15e68b JM |
780 | cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL); |
781 | ||
34e89507 JB |
782 | rate_control_remove_sta_debugfs(sta); |
783 | ieee80211_sta_debugfs_remove(sta); | |
784 | ||
b22cfcfc | 785 | call_rcu(&sta->rcu_head, free_sta_rcu); |
34e89507 JB |
786 | |
787 | return 0; | |
4d6141c3 JS |
788 | } |
789 | ||
34e89507 | 790 | int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) |
4d6141c3 | 791 | { |
34e89507 JB |
792 | struct sta_info *sta; |
793 | int ret; | |
4d6141c3 | 794 | |
34e89507 | 795 | mutex_lock(&sdata->local->sta_mtx); |
7852e361 | 796 | sta = sta_info_get(sdata, addr); |
34e89507 JB |
797 | ret = __sta_info_destroy(sta); |
798 | mutex_unlock(&sdata->local->sta_mtx); | |
4d6141c3 JS |
799 | |
800 | return ret; | |
801 | } | |
802 | ||
34e89507 JB |
803 | int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, |
804 | const u8 *addr) | |
e9f207f0 | 805 | { |
34e89507 JB |
806 | struct sta_info *sta; |
807 | int ret; | |
e9f207f0 | 808 | |
34e89507 | 809 | mutex_lock(&sdata->local->sta_mtx); |
7852e361 | 810 | sta = sta_info_get_bss(sdata, addr); |
34e89507 JB |
811 | ret = __sta_info_destroy(sta); |
812 | mutex_unlock(&sdata->local->sta_mtx); | |
d0709a65 | 813 | |
34e89507 JB |
814 | return ret; |
815 | } | |
e9f207f0 | 816 | |
34e89507 JB |
817 | static void sta_info_cleanup(unsigned long data) |
818 | { | |
819 | struct ieee80211_local *local = (struct ieee80211_local *) data; | |
820 | struct sta_info *sta; | |
3393a608 | 821 | bool timer_needed = false; |
34e89507 JB |
822 | |
823 | rcu_read_lock(); | |
824 | list_for_each_entry_rcu(sta, &local->sta_list, list) | |
3393a608 JO |
825 | if (sta_info_cleanup_expire_buffered(local, sta)) |
826 | timer_needed = true; | |
34e89507 | 827 | rcu_read_unlock(); |
e9f207f0 | 828 | |
34e89507 JB |
829 | if (local->quiescing) |
830 | return; | |
d0709a65 | 831 | |
3393a608 JO |
832 | if (!timer_needed) |
833 | return; | |
834 | ||
26d59535 JB |
835 | mod_timer(&local->sta_cleanup, |
836 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); | |
e9f207f0 | 837 | } |
e9f207f0 | 838 | |
f0706e82 JB |
839 | void sta_info_init(struct ieee80211_local *local) |
840 | { | |
4d33960b | 841 | spin_lock_init(&local->tim_lock); |
34e89507 | 842 | mutex_init(&local->sta_mtx); |
f0706e82 | 843 | INIT_LIST_HEAD(&local->sta_list); |
f0706e82 | 844 | |
b24b8a24 PE |
845 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
846 | (unsigned long)local); | |
f0706e82 JB |
847 | } |
848 | ||
849 | void sta_info_stop(struct ieee80211_local *local) | |
850 | { | |
f0706e82 | 851 | del_timer(&local->sta_cleanup); |
be8755e1 | 852 | sta_info_flush(local, NULL); |
f0706e82 JB |
853 | } |
854 | ||
f0706e82 JB |
855 | /** |
856 | * sta_info_flush - flush matching STA entries from the STA table | |
44213b5e JB |
857 | * |
858 | * Returns the number of removed STA entries. | |
859 | * | |
f0706e82 | 860 | * @local: local interface data |
d0709a65 | 861 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
f0706e82 | 862 | */ |
44213b5e | 863 | int sta_info_flush(struct ieee80211_local *local, |
af8cdcd8 | 864 | struct ieee80211_sub_if_data *sdata) |
f0706e82 JB |
865 | { |
866 | struct sta_info *sta, *tmp; | |
44213b5e | 867 | int ret = 0; |
f0706e82 | 868 | |
d0709a65 | 869 | might_sleep(); |
be8755e1 | 870 | |
34e89507 | 871 | mutex_lock(&local->sta_mtx); |
d0709a65 | 872 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
34316837 | 873 | if (!sdata || sdata == sta->sdata) { |
34e89507 | 874 | WARN_ON(__sta_info_destroy(sta)); |
34316837 JB |
875 | ret++; |
876 | } | |
be8755e1 | 877 | } |
34e89507 | 878 | mutex_unlock(&local->sta_mtx); |
44213b5e JB |
879 | |
880 | return ret; | |
f0706e82 | 881 | } |
dc6676b7 | 882 | |
24723d1b JB |
883 | void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, |
884 | unsigned long exp_time) | |
885 | { | |
886 | struct ieee80211_local *local = sdata->local; | |
887 | struct sta_info *sta, *tmp; | |
24723d1b | 888 | |
34e89507 | 889 | mutex_lock(&local->sta_mtx); |
e46a2cf9 MSS |
890 | |
891 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
ec2b774e ML |
892 | if (sdata != sta->sdata) |
893 | continue; | |
894 | ||
24723d1b | 895 | if (time_after(jiffies, sta->last_rx + exp_time)) { |
bdcbd8e0 JB |
896 | ibss_dbg(sdata, "expiring inactive STA %pM\n", |
897 | sta->sta.addr); | |
34e89507 | 898 | WARN_ON(__sta_info_destroy(sta)); |
24723d1b | 899 | } |
e46a2cf9 MSS |
900 | } |
901 | ||
34e89507 | 902 | mutex_unlock(&local->sta_mtx); |
24723d1b | 903 | } |
17741cdc | 904 | |
686b9cb9 BG |
905 | struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, |
906 | const u8 *addr, | |
907 | const u8 *localaddr) | |
17741cdc | 908 | { |
abe60632 | 909 | struct sta_info *sta, *nxt; |
17741cdc | 910 | |
686b9cb9 BG |
911 | /* |
912 | * Just return a random station if localaddr is NULL | |
913 | * ... first in list. | |
914 | */ | |
f7c65594 | 915 | for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { |
686b9cb9 | 916 | if (localaddr && |
b203ca39 | 917 | !ether_addr_equal(sta->sdata->vif.addr, localaddr)) |
686b9cb9 | 918 | continue; |
f7c65594 JB |
919 | if (!sta->uploaded) |
920 | return NULL; | |
abe60632 | 921 | return &sta->sta; |
f7c65594 JB |
922 | } |
923 | ||
abe60632 | 924 | return NULL; |
17741cdc | 925 | } |
686b9cb9 | 926 | EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); |
5ed176e1 JB |
927 | |
928 | struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, | |
929 | const u8 *addr) | |
930 | { | |
f7c65594 | 931 | struct sta_info *sta; |
5ed176e1 JB |
932 | |
933 | if (!vif) | |
934 | return NULL; | |
935 | ||
f7c65594 JB |
936 | sta = sta_info_get_bss(vif_to_sdata(vif), addr); |
937 | if (!sta) | |
938 | return NULL; | |
939 | ||
940 | if (!sta->uploaded) | |
941 | return NULL; | |
5ed176e1 | 942 | |
f7c65594 | 943 | return &sta->sta; |
5ed176e1 | 944 | } |
17741cdc | 945 | EXPORT_SYMBOL(ieee80211_find_sta); |
af818581 | 946 | |
50a9432d JB |
947 | static void clear_sta_ps_flags(void *_sta) |
948 | { | |
949 | struct sta_info *sta = _sta; | |
608383bf | 950 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
50a9432d | 951 | |
c2c98fde | 952 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
608383bf HS |
953 | if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA)) |
954 | atomic_dec(&sdata->bss->num_sta_ps); | |
50a9432d JB |
955 | } |
956 | ||
af818581 JB |
957 | /* powersave support code */ |
958 | void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) | |
959 | { | |
960 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
961 | struct ieee80211_local *local = sdata->local; | |
948d887d JB |
962 | struct sk_buff_head pending; |
963 | int filtered = 0, buffered = 0, ac; | |
964 | ||
c2c98fde | 965 | clear_sta_flag(sta, WLAN_STA_SP); |
47086fc5 | 966 | |
948d887d JB |
967 | BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1); |
968 | sta->driver_buffered_tids = 0; | |
af818581 | 969 | |
d057e5a3 AN |
970 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) |
971 | drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); | |
af818581 | 972 | |
948d887d | 973 | skb_queue_head_init(&pending); |
af818581 JB |
974 | |
975 | /* Send all buffered frames to the station */ | |
948d887d JB |
976 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
977 | int count = skb_queue_len(&pending), tmp; | |
978 | ||
979 | skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending); | |
980 | tmp = skb_queue_len(&pending); | |
981 | filtered += tmp - count; | |
982 | count = tmp; | |
983 | ||
984 | skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending); | |
985 | tmp = skb_queue_len(&pending); | |
986 | buffered += tmp - count; | |
987 | } | |
988 | ||
989 | ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta); | |
990 | ||
af818581 JB |
991 | local->total_ps_buffered -= buffered; |
992 | ||
c868cb35 JB |
993 | sta_info_recalc_tim(sta); |
994 | ||
bdcbd8e0 JB |
995 | ps_dbg(sdata, |
996 | "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n", | |
997 | sta->sta.addr, sta->sta.aid, filtered, buffered); | |
af818581 JB |
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 | ||
bdcbd8e0 JB |
1387 | sta_dbg(sta->sdata, "moving STA %pM to state %d\n", |
1388 | sta->sta.addr, new_state); | |
f09603a2 JB |
1389 | |
1390 | /* | |
1391 | * notify the driver before the actual changes so it can | |
1392 | * fail the transition | |
1393 | */ | |
1394 | if (test_sta_flag(sta, WLAN_STA_INSERTED)) { | |
1395 | int err = drv_sta_state(sta->local, sta->sdata, sta, | |
1396 | sta->sta_state, new_state); | |
1397 | if (err) | |
1398 | return err; | |
1399 | } | |
1400 | ||
1401 | /* reflect the change in all state variables */ | |
1402 | ||
d9a7ddb0 JB |
1403 | switch (new_state) { |
1404 | case IEEE80211_STA_NONE: | |
1405 | if (sta->sta_state == IEEE80211_STA_AUTH) | |
1406 | clear_bit(WLAN_STA_AUTH, &sta->_flags); | |
d9a7ddb0 JB |
1407 | break; |
1408 | case IEEE80211_STA_AUTH: | |
1409 | if (sta->sta_state == IEEE80211_STA_NONE) | |
1410 | set_bit(WLAN_STA_AUTH, &sta->_flags); | |
1411 | else if (sta->sta_state == IEEE80211_STA_ASSOC) | |
1412 | clear_bit(WLAN_STA_ASSOC, &sta->_flags); | |
d9a7ddb0 JB |
1413 | break; |
1414 | case IEEE80211_STA_ASSOC: | |
29623892 | 1415 | if (sta->sta_state == IEEE80211_STA_AUTH) { |
d9a7ddb0 | 1416 | set_bit(WLAN_STA_ASSOC, &sta->_flags); |
29623892 | 1417 | } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) { |
7e3ed02c FF |
1418 | if (sta->sdata->vif.type == NL80211_IFTYPE_AP || |
1419 | (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1420 | !sta->sdata->u.vlan.sta)) | |
1421 | atomic_dec(&sta->sdata->bss->num_mcast_sta); | |
d9a7ddb0 | 1422 | clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags); |
f09603a2 | 1423 | } |
d9a7ddb0 JB |
1424 | break; |
1425 | case IEEE80211_STA_AUTHORIZED: | |
29623892 | 1426 | if (sta->sta_state == IEEE80211_STA_ASSOC) { |
7e3ed02c FF |
1427 | if (sta->sdata->vif.type == NL80211_IFTYPE_AP || |
1428 | (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && | |
1429 | !sta->sdata->u.vlan.sta)) | |
1430 | atomic_inc(&sta->sdata->bss->num_mcast_sta); | |
d9a7ddb0 | 1431 | set_bit(WLAN_STA_AUTHORIZED, &sta->_flags); |
f09603a2 | 1432 | } |
d9a7ddb0 JB |
1433 | break; |
1434 | default: | |
f09603a2 | 1435 | break; |
d9a7ddb0 JB |
1436 | } |
1437 | ||
d9a7ddb0 JB |
1438 | sta->sta_state = new_state; |
1439 | ||
1440 | return 0; | |
1441 | } |