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> | |
12 | #include <linux/netdevice.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/if_arp.h> | |
0d174406 | 17 | #include <linux/timer.h> |
d0709a65 | 18 | #include <linux/rtnetlink.h> |
f0706e82 JB |
19 | |
20 | #include <net/mac80211.h> | |
21 | #include "ieee80211_i.h" | |
24487981 | 22 | #include "driver-ops.h" |
2c8dccc7 | 23 | #include "rate.h" |
f0706e82 | 24 | #include "sta_info.h" |
e9f207f0 | 25 | #include "debugfs_sta.h" |
ee385855 | 26 | #include "mesh.h" |
ce662b44 | 27 | #include "wme.h" |
f0706e82 | 28 | |
d0709a65 JB |
29 | /** |
30 | * DOC: STA information lifetime rules | |
31 | * | |
32 | * STA info structures (&struct sta_info) are managed in a hash table | |
33 | * for faster lookup and a list for iteration. They are managed using | |
34 | * RCU, i.e. access to the list and hash table is protected by RCU. | |
35 | * | |
34e89507 JB |
36 | * Upon allocating a STA info structure with sta_info_alloc(), the caller |
37 | * owns that structure. It must then insert it into the hash table using | |
38 | * either sta_info_insert() or sta_info_insert_rcu(); only in the latter | |
39 | * case (which acquires an rcu read section but must not be called from | |
40 | * within one) will the pointer still be valid after the call. Note that | |
41 | * the caller may not do much with the STA info before inserting it, in | |
42 | * particular, it may not start any mesh peer link management or add | |
43 | * encryption keys. | |
93e5deb1 JB |
44 | * |
45 | * When the insertion fails (sta_info_insert()) returns non-zero), the | |
46 | * structure will have been freed by sta_info_insert()! | |
d0709a65 | 47 | * |
34e89507 | 48 | * Station entries are added by mac80211 when you establish a link with a |
7e189a12 LR |
49 | * peer. This means different things for the different type of interfaces |
50 | * we support. For a regular station this mean we add the AP sta when we | |
25985edc | 51 | * receive an association response from the AP. For IBSS this occurs when |
34e89507 | 52 | * get to know about a peer on the same IBSS. For WDS we add the sta for |
25985edc | 53 | * the peer immediately upon device open. When using AP mode we add stations |
34e89507 | 54 | * for each respective station upon request from userspace through nl80211. |
7e189a12 | 55 | * |
34e89507 JB |
56 | * In order to remove a STA info structure, various sta_info_destroy_*() |
57 | * calls are available. | |
d0709a65 | 58 | * |
34e89507 JB |
59 | * There is no concept of ownership on a STA entry, each structure is |
60 | * owned by the global hash table/list until it is removed. All users of | |
61 | * the structure need to be RCU protected so that the structure won't be | |
62 | * freed before they are done using it. | |
d0709a65 | 63 | */ |
f0706e82 | 64 | |
4d33960b | 65 | /* Caller must hold local->sta_mtx */ |
be8755e1 MW |
66 | static int sta_info_hash_del(struct ieee80211_local *local, |
67 | struct sta_info *sta) | |
f0706e82 JB |
68 | { |
69 | struct sta_info *s; | |
70 | ||
40b275b6 | 71 | s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)], |
4d33960b | 72 | lockdep_is_held(&local->sta_mtx)); |
f0706e82 | 73 | if (!s) |
be8755e1 MW |
74 | return -ENOENT; |
75 | if (s == sta) { | |
cf778b00 | 76 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], |
d0709a65 | 77 | s->hnext); |
be8755e1 | 78 | return 0; |
f0706e82 JB |
79 | } |
80 | ||
40b275b6 JB |
81 | while (rcu_access_pointer(s->hnext) && |
82 | rcu_access_pointer(s->hnext) != sta) | |
83 | s = rcu_dereference_protected(s->hnext, | |
4d33960b | 84 | lockdep_is_held(&local->sta_mtx)); |
40b275b6 | 85 | if (rcu_access_pointer(s->hnext)) { |
cf778b00 | 86 | rcu_assign_pointer(s->hnext, sta->hnext); |
be8755e1 MW |
87 | return 0; |
88 | } | |
f0706e82 | 89 | |
be8755e1 | 90 | return -ENOENT; |
f0706e82 JB |
91 | } |
92 | ||
d0709a65 | 93 | /* protected by RCU */ |
abe60632 JB |
94 | struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, |
95 | const u8 *addr) | |
f0706e82 | 96 | { |
abe60632 | 97 | struct ieee80211_local *local = sdata->local; |
f0706e82 JB |
98 | struct sta_info *sta; |
99 | ||
2a33bee2 | 100 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
2a33bee2 GE |
101 | lockdep_is_held(&local->sta_mtx)); |
102 | while (sta) { | |
103 | if (sta->sdata == sdata && !sta->dummy && | |
104 | memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) | |
105 | break; | |
106 | sta = rcu_dereference_check(sta->hnext, | |
2a33bee2 GE |
107 | lockdep_is_held(&local->sta_mtx)); |
108 | } | |
109 | return sta; | |
110 | } | |
111 | ||
112 | /* get a station info entry even if it is a dummy station*/ | |
113 | struct sta_info *sta_info_get_rx(struct ieee80211_sub_if_data *sdata, | |
114 | const u8 *addr) | |
115 | { | |
116 | struct ieee80211_local *local = sdata->local; | |
117 | struct sta_info *sta; | |
118 | ||
0379185b | 119 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
0379185b | 120 | lockdep_is_held(&local->sta_mtx)); |
f0706e82 | 121 | while (sta) { |
abe60632 JB |
122 | if (sta->sdata == sdata && |
123 | memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) | |
f0706e82 | 124 | break; |
0379185b | 125 | sta = rcu_dereference_check(sta->hnext, |
0379185b | 126 | lockdep_is_held(&local->sta_mtx)); |
f0706e82 | 127 | } |
43ba7e95 JB |
128 | return sta; |
129 | } | |
130 | ||
0e5ded5a FF |
131 | /* |
132 | * Get sta info either from the specified interface | |
133 | * or from one of its vlans | |
134 | */ | |
135 | struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, | |
136 | const u8 *addr) | |
137 | { | |
138 | struct ieee80211_local *local = sdata->local; | |
139 | struct sta_info *sta; | |
140 | ||
2a33bee2 | 141 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
2a33bee2 GE |
142 | lockdep_is_held(&local->sta_mtx)); |
143 | while (sta) { | |
144 | if ((sta->sdata == sdata || | |
145 | (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && | |
146 | !sta->dummy && | |
147 | memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) | |
148 | break; | |
149 | sta = rcu_dereference_check(sta->hnext, | |
2a33bee2 GE |
150 | lockdep_is_held(&local->sta_mtx)); |
151 | } | |
152 | return sta; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Get sta info either from the specified interface | |
157 | * or from one of its vlans (including dummy stations) | |
158 | */ | |
159 | struct sta_info *sta_info_get_bss_rx(struct ieee80211_sub_if_data *sdata, | |
160 | const u8 *addr) | |
161 | { | |
162 | struct ieee80211_local *local = sdata->local; | |
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)); |
0e5ded5a FF |
167 | while (sta) { |
168 | if ((sta->sdata == sdata || | |
a2c1e3da | 169 | (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && |
0e5ded5a FF |
170 | memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) |
171 | break; | |
0379185b | 172 | sta = rcu_dereference_check(sta->hnext, |
0379185b | 173 | lockdep_is_held(&local->sta_mtx)); |
0e5ded5a FF |
174 | } |
175 | return sta; | |
176 | } | |
177 | ||
3b53fde8 JB |
178 | struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, |
179 | int idx) | |
ee385855 | 180 | { |
3b53fde8 | 181 | struct ieee80211_local *local = sdata->local; |
ee385855 LCC |
182 | struct sta_info *sta; |
183 | int i = 0; | |
184 | ||
d0709a65 | 185 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
3b53fde8 | 186 | if (sdata != sta->sdata) |
2a8ca29a | 187 | continue; |
ee385855 LCC |
188 | if (i < idx) { |
189 | ++i; | |
190 | continue; | |
ee385855 | 191 | } |
2a8ca29a | 192 | return sta; |
ee385855 | 193 | } |
ee385855 LCC |
194 | |
195 | return NULL; | |
196 | } | |
f0706e82 | 197 | |
93e5deb1 | 198 | /** |
d9a7ddb0 | 199 | * sta_info_free - free STA |
93e5deb1 | 200 | * |
6ef307bc | 201 | * @local: pointer to the global information |
93e5deb1 JB |
202 | * @sta: STA info to free |
203 | * | |
204 | * This function must undo everything done by sta_info_alloc() | |
d9a7ddb0 JB |
205 | * that may happen before sta_info_insert(). It may only be |
206 | * called when sta_info_insert() has not been attempted (and | |
207 | * if that fails, the station is freed anyway.) | |
93e5deb1 | 208 | */ |
d9a7ddb0 | 209 | void sta_info_free(struct ieee80211_local *local, struct sta_info *sta) |
93e5deb1 | 210 | { |
889cbb91 | 211 | if (sta->rate_ctrl) |
af65cd96 | 212 | rate_control_free_sta(sta); |
93e5deb1 JB |
213 | |
214 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0fb9a9ec | 215 | wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr); |
93e5deb1 JB |
216 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
217 | ||
218 | kfree(sta); | |
219 | } | |
220 | ||
4d33960b | 221 | /* Caller must hold local->sta_mtx */ |
d0709a65 JB |
222 | static void sta_info_hash_add(struct ieee80211_local *local, |
223 | struct sta_info *sta) | |
f0706e82 | 224 | { |
4d33960b | 225 | lockdep_assert_held(&local->sta_mtx); |
17741cdc | 226 | sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; |
cf778b00 | 227 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); |
f0706e82 | 228 | } |
f0706e82 | 229 | |
af818581 JB |
230 | static void sta_unblock(struct work_struct *wk) |
231 | { | |
232 | struct sta_info *sta; | |
233 | ||
234 | sta = container_of(wk, struct sta_info, drv_unblock_wk); | |
235 | ||
236 | if (sta->dead) | |
237 | return; | |
238 | ||
54420473 HS |
239 | if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { |
240 | local_bh_disable(); | |
af818581 | 241 | ieee80211_sta_ps_deliver_wakeup(sta); |
54420473 HS |
242 | local_bh_enable(); |
243 | } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) { | |
c2c98fde | 244 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
ce662b44 JB |
245 | |
246 | local_bh_disable(); | |
af818581 | 247 | ieee80211_sta_ps_deliver_poll_response(sta); |
ce662b44 | 248 | local_bh_enable(); |
c2c98fde JB |
249 | } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) { |
250 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); | |
ce662b44 JB |
251 | |
252 | local_bh_disable(); | |
47086fc5 | 253 | ieee80211_sta_ps_deliver_uapsd(sta); |
ce662b44 | 254 | local_bh_enable(); |
50a9432d | 255 | } else |
c2c98fde | 256 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
af818581 JB |
257 | } |
258 | ||
af65cd96 JB |
259 | static int sta_prepare_rate_control(struct ieee80211_local *local, |
260 | struct sta_info *sta, gfp_t gfp) | |
261 | { | |
262 | if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) | |
263 | return 0; | |
264 | ||
889cbb91 | 265 | sta->rate_ctrl = local->rate_ctrl; |
af65cd96 JB |
266 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, |
267 | &sta->sta, gfp); | |
889cbb91 | 268 | if (!sta->rate_ctrl_priv) |
af65cd96 | 269 | return -ENOMEM; |
af65cd96 JB |
270 | |
271 | return 0; | |
272 | } | |
273 | ||
73651ee6 | 274 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
56544160 | 275 | const u8 *addr, gfp_t gfp) |
f0706e82 | 276 | { |
d0709a65 | 277 | struct ieee80211_local *local = sdata->local; |
f0706e82 | 278 | struct sta_info *sta; |
ebe27c91 | 279 | struct timespec uptime; |
16c5f15c | 280 | int i; |
f0706e82 | 281 | |
17741cdc | 282 | sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); |
f0706e82 | 283 | if (!sta) |
73651ee6 | 284 | return NULL; |
f0706e82 | 285 | |
07346f81 | 286 | spin_lock_init(&sta->lock); |
af818581 | 287 | INIT_WORK(&sta->drv_unblock_wk, sta_unblock); |
67c282c0 | 288 | INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); |
a93e3644 | 289 | mutex_init(&sta->ampdu_mlme.mtx); |
07346f81 | 290 | |
17741cdc | 291 | memcpy(sta->sta.addr, addr, ETH_ALEN); |
d0709a65 JB |
292 | sta->local = local; |
293 | sta->sdata = sdata; | |
8bc8aecd | 294 | sta->last_rx = jiffies; |
f0706e82 | 295 | |
ebe27c91 MSS |
296 | do_posix_clock_monotonic_gettime(&uptime); |
297 | sta->last_connected = uptime.tv_sec; | |
541a45a1 BR |
298 | ewma_init(&sta->avg_signal, 1024, 8); |
299 | ||
af65cd96 | 300 | if (sta_prepare_rate_control(local, sta, gfp)) { |
f0706e82 | 301 | kfree(sta); |
73651ee6 | 302 | return NULL; |
f0706e82 JB |
303 | } |
304 | ||
16c5f15c | 305 | for (i = 0; i < STA_TID_NUM; i++) { |
a622ab72 JB |
306 | /* |
307 | * timer_to_tid must be initialized with identity mapping | |
308 | * to enable session_timer's data differentiation. See | |
309 | * sta_rx_agg_session_timer_expired for usage. | |
310 | */ | |
16c5f15c | 311 | sta->timer_to_tid[i] = i; |
16c5f15c | 312 | } |
948d887d JB |
313 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { |
314 | skb_queue_head_init(&sta->ps_tx_buf[i]); | |
315 | skb_queue_head_init(&sta->tx_filtered[i]); | |
316 | } | |
73651ee6 | 317 | |
cccaec98 | 318 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) |
4be929be | 319 | sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); |
cccaec98 | 320 | |
73651ee6 | 321 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
0fb9a9ec | 322 | wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr); |
73651ee6 JB |
323 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
324 | ||
03e4497e | 325 | #ifdef CONFIG_MAC80211_MESH |
57cf8043 | 326 | sta->plink_state = NL80211_PLINK_LISTEN; |
03e4497e JB |
327 | init_timer(&sta->plink_timer); |
328 | #endif | |
329 | ||
73651ee6 JB |
330 | return sta; |
331 | } | |
332 | ||
8c71df7a | 333 | static int sta_info_insert_check(struct sta_info *sta) |
34e89507 | 334 | { |
34e89507 | 335 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
34e89507 | 336 | |
03e4497e JB |
337 | /* |
338 | * Can't be a WARN_ON because it can be triggered through a race: | |
339 | * something inserts a STA (on one CPU) without holding the RTNL | |
340 | * and another CPU turns off the net device. | |
341 | */ | |
8c71df7a GE |
342 | if (unlikely(!ieee80211_sdata_running(sdata))) |
343 | return -ENETDOWN; | |
03e4497e | 344 | |
47846c9b | 345 | if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 || |
8c71df7a GE |
346 | is_multicast_ether_addr(sta->sta.addr))) |
347 | return -EINVAL; | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
8c71df7a GE |
352 | /* |
353 | * should be called with sta_mtx locked | |
354 | * this function replaces the mutex lock | |
355 | * with a RCU lock | |
356 | */ | |
4d33960b | 357 | static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU) |
8c71df7a GE |
358 | { |
359 | struct ieee80211_local *local = sta->local; | |
360 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
2a33bee2 GE |
361 | struct sta_info *exist_sta; |
362 | bool dummy_reinsert = false; | |
8c71df7a GE |
363 | int err = 0; |
364 | ||
365 | lockdep_assert_held(&local->sta_mtx); | |
34e89507 | 366 | |
2a33bee2 GE |
367 | /* |
368 | * check if STA exists already. | |
4d33960b | 369 | * only accept a scenario of a second call to sta_info_insert_finish |
2a33bee2 GE |
370 | * with a dummy station entry that was inserted earlier |
371 | * in that case - assume that the dummy station flag should | |
372 | * be removed. | |
373 | */ | |
374 | exist_sta = sta_info_get_bss_rx(sdata, sta->sta.addr); | |
375 | if (exist_sta) { | |
376 | if (exist_sta == sta && sta->dummy) { | |
377 | dummy_reinsert = true; | |
378 | } else { | |
4d33960b JB |
379 | err = -EEXIST; |
380 | goto out_err; | |
2a33bee2 | 381 | } |
43ba7e95 | 382 | } |
32bfd35d | 383 | |
4d33960b JB |
384 | if (!sta->dummy || dummy_reinsert) { |
385 | /* notify driver */ | |
386 | err = drv_sta_add(local, sdata, &sta->sta); | |
387 | if (err) { | |
388 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) | |
389 | goto out_err; | |
390 | printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to " | |
391 | "driver (%d) - keeping it anyway.\n", | |
392 | sdata->name, sta->sta.addr, err); | |
393 | } else | |
394 | sta->uploaded = true; | |
395 | } | |
32bfd35d | 396 | |
4d33960b JB |
397 | if (!dummy_reinsert) { |
398 | local->num_sta++; | |
399 | local->sta_generation++; | |
400 | smp_mb(); | |
401 | ||
402 | /* make the station visible */ | |
403 | sta_info_hash_add(local, sta); | |
404 | ||
405 | list_add(&sta->list, &local->sta_list); | |
406 | } else { | |
407 | sta->dummy = false; | |
408 | } | |
409 | ||
410 | if (!sta->dummy) { | |
411 | struct station_info sinfo; | |
412 | ||
413 | ieee80211_sta_debugfs_add(sta); | |
414 | rate_control_add_sta_debugfs(sta); | |
415 | ||
416 | memset(&sinfo, 0, sizeof(sinfo)); | |
417 | sinfo.filled = 0; | |
418 | sinfo.generation = local->sta_generation; | |
419 | cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); | |
32bfd35d | 420 | } |
d0709a65 | 421 | |
f0706e82 | 422 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
2a33bee2 GE |
423 | wiphy_debug(local->hw.wiphy, "Inserted %sSTA %pM\n", |
424 | sta->dummy ? "dummy " : "", sta->sta.addr); | |
f0706e82 JB |
425 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
426 | ||
34e89507 JB |
427 | /* move reference to rcu-protected */ |
428 | rcu_read_lock(); | |
429 | mutex_unlock(&local->sta_mtx); | |
e9f207f0 | 430 | |
73651ee6 JB |
431 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
432 | mesh_accept_plinks_update(sdata); | |
433 | ||
8c71df7a | 434 | return 0; |
4d33960b JB |
435 | out_err: |
436 | mutex_unlock(&local->sta_mtx); | |
437 | rcu_read_lock(); | |
438 | return err; | |
8c71df7a GE |
439 | } |
440 | ||
441 | int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) | |
442 | { | |
443 | struct ieee80211_local *local = sta->local; | |
8c71df7a GE |
444 | int err = 0; |
445 | ||
4d33960b JB |
446 | might_sleep(); |
447 | ||
8c71df7a GE |
448 | err = sta_info_insert_check(sta); |
449 | if (err) { | |
450 | rcu_read_lock(); | |
451 | goto out_free; | |
452 | } | |
453 | ||
8c71df7a GE |
454 | mutex_lock(&local->sta_mtx); |
455 | ||
4d33960b | 456 | err = sta_info_insert_finish(sta); |
8c71df7a GE |
457 | if (err) |
458 | goto out_free; | |
459 | ||
73651ee6 | 460 | return 0; |
93e5deb1 JB |
461 | out_free: |
462 | BUG_ON(!err); | |
d9a7ddb0 | 463 | sta_info_free(local, sta); |
93e5deb1 | 464 | return err; |
f0706e82 JB |
465 | } |
466 | ||
34e89507 JB |
467 | int sta_info_insert(struct sta_info *sta) |
468 | { | |
469 | int err = sta_info_insert_rcu(sta); | |
470 | ||
471 | rcu_read_unlock(); | |
472 | ||
473 | return err; | |
474 | } | |
475 | ||
2a33bee2 GE |
476 | /* Caller must hold sta->local->sta_mtx */ |
477 | int sta_info_reinsert(struct sta_info *sta) | |
478 | { | |
479 | struct ieee80211_local *local = sta->local; | |
480 | int err = 0; | |
481 | ||
482 | err = sta_info_insert_check(sta); | |
483 | if (err) { | |
484 | mutex_unlock(&local->sta_mtx); | |
485 | return err; | |
486 | } | |
487 | ||
488 | might_sleep(); | |
489 | ||
4d33960b | 490 | err = sta_info_insert_finish(sta); |
2a33bee2 GE |
491 | rcu_read_unlock(); |
492 | return err; | |
493 | } | |
494 | ||
004c872e JB |
495 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
496 | { | |
497 | /* | |
498 | * This format has been mandated by the IEEE specifications, | |
499 | * so this line may not be changed to use the __set_bit() format. | |
500 | */ | |
501 | bss->tim[aid / 8] |= (1 << (aid % 8)); | |
502 | } | |
503 | ||
504 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) | |
505 | { | |
506 | /* | |
507 | * This format has been mandated by the IEEE specifications, | |
508 | * so this line may not be changed to use the __clear_bit() format. | |
509 | */ | |
510 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); | |
511 | } | |
512 | ||
948d887d | 513 | static unsigned long ieee80211_tids_for_ac(int ac) |
004c872e | 514 | { |
948d887d JB |
515 | /* If we ever support TIDs > 7, this obviously needs to be adjusted */ |
516 | switch (ac) { | |
517 | case IEEE80211_AC_VO: | |
518 | return BIT(6) | BIT(7); | |
519 | case IEEE80211_AC_VI: | |
520 | return BIT(4) | BIT(5); | |
521 | case IEEE80211_AC_BE: | |
522 | return BIT(0) | BIT(3); | |
523 | case IEEE80211_AC_BK: | |
524 | return BIT(1) | BIT(2); | |
525 | default: | |
526 | WARN_ON(1); | |
527 | return 0; | |
d0709a65 | 528 | } |
004c872e JB |
529 | } |
530 | ||
c868cb35 | 531 | void sta_info_recalc_tim(struct sta_info *sta) |
004c872e | 532 | { |
c868cb35 JB |
533 | struct ieee80211_local *local = sta->local; |
534 | struct ieee80211_if_ap *bss = sta->sdata->bss; | |
d0709a65 | 535 | unsigned long flags; |
948d887d JB |
536 | bool indicate_tim = false; |
537 | u8 ignore_for_tim = sta->sta.uapsd_queues; | |
538 | int ac; | |
004c872e | 539 | |
c868cb35 JB |
540 | if (WARN_ON_ONCE(!sta->sdata->bss)) |
541 | return; | |
3e122be0 | 542 | |
c868cb35 JB |
543 | /* No need to do anything if the driver does all */ |
544 | if (local->hw.flags & IEEE80211_HW_AP_LINK_PS) | |
545 | return; | |
004c872e | 546 | |
c868cb35 JB |
547 | if (sta->dead) |
548 | goto done; | |
3e122be0 | 549 | |
948d887d JB |
550 | /* |
551 | * If all ACs are delivery-enabled then we should build | |
552 | * the TIM bit for all ACs anyway; if only some are then | |
553 | * we ignore those and build the TIM bit using only the | |
554 | * non-enabled ones. | |
555 | */ | |
556 | if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1) | |
557 | ignore_for_tim = 0; | |
558 | ||
559 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { | |
560 | unsigned long tids; | |
3e122be0 | 561 | |
948d887d JB |
562 | if (ignore_for_tim & BIT(ac)) |
563 | continue; | |
564 | ||
565 | indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) || | |
566 | !skb_queue_empty(&sta->ps_tx_buf[ac]); | |
567 | if (indicate_tim) | |
568 | break; | |
3e122be0 | 569 | |
948d887d JB |
570 | tids = ieee80211_tids_for_ac(ac); |
571 | ||
572 | indicate_tim |= | |
573 | sta->driver_buffered_tids & tids; | |
d0709a65 | 574 | } |
004c872e | 575 | |
c868cb35 | 576 | done: |
4d33960b | 577 | spin_lock_irqsave(&local->tim_lock, flags); |
004c872e | 578 | |
948d887d | 579 | if (indicate_tim) |
c868cb35 JB |
580 | __bss_tim_set(bss, sta->sta.aid); |
581 | else | |
582 | __bss_tim_clear(bss, sta->sta.aid); | |
004c872e | 583 | |
c868cb35 JB |
584 | if (local->ops->set_tim) { |
585 | local->tim_in_locked_section = true; | |
948d887d | 586 | drv_set_tim(local, &sta->sta, indicate_tim); |
c868cb35 JB |
587 | local->tim_in_locked_section = false; |
588 | } | |
3e122be0 | 589 | |
4d33960b | 590 | spin_unlock_irqrestore(&local->tim_lock, flags); |
004c872e JB |
591 | } |
592 | ||
cd0b8d89 | 593 | static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb) |
f0706e82 | 594 | { |
e039fa4a | 595 | struct ieee80211_tx_info *info; |
f0706e82 JB |
596 | int timeout; |
597 | ||
598 | if (!skb) | |
cd0b8d89 | 599 | return false; |
f0706e82 | 600 | |
e039fa4a | 601 | info = IEEE80211_SKB_CB(skb); |
f0706e82 JB |
602 | |
603 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ | |
57c4d7b4 JB |
604 | timeout = (sta->listen_interval * |
605 | sta->sdata->vif.bss_conf.beacon_int * | |
606 | 32 / 15625) * HZ; | |
f0706e82 JB |
607 | if (timeout < STA_TX_BUFFER_EXPIRE) |
608 | timeout = STA_TX_BUFFER_EXPIRE; | |
e039fa4a | 609 | return time_after(jiffies, info->control.jiffies + timeout); |
f0706e82 JB |
610 | } |
611 | ||
612 | ||
948d887d JB |
613 | static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local, |
614 | struct sta_info *sta, int ac) | |
f0706e82 JB |
615 | { |
616 | unsigned long flags; | |
617 | struct sk_buff *skb; | |
618 | ||
60750397 JB |
619 | /* |
620 | * First check for frames that should expire on the filtered | |
621 | * queue. Frames here were rejected by the driver and are on | |
622 | * a separate queue to avoid reordering with normal PS-buffered | |
623 | * frames. They also aren't accounted for right now in the | |
624 | * total_ps_buffered counter. | |
625 | */ | |
626 | for (;;) { | |
948d887d JB |
627 | spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); |
628 | skb = skb_peek(&sta->tx_filtered[ac]); | |
60750397 | 629 | if (sta_info_buffer_expired(sta, skb)) |
948d887d | 630 | skb = __skb_dequeue(&sta->tx_filtered[ac]); |
60750397 JB |
631 | else |
632 | skb = NULL; | |
948d887d | 633 | spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); |
60750397 JB |
634 | |
635 | /* | |
636 | * Frames are queued in order, so if this one | |
637 | * hasn't expired yet we can stop testing. If | |
638 | * we actually reached the end of the queue we | |
639 | * also need to stop, of course. | |
640 | */ | |
641 | if (!skb) | |
642 | break; | |
643 | dev_kfree_skb(skb); | |
644 | } | |
645 | ||
646 | /* | |
647 | * Now also check the normal PS-buffered queue, this will | |
648 | * only find something if the filtered queue was emptied | |
649 | * since the filtered frames are all before the normal PS | |
650 | * buffered frames. | |
651 | */ | |
f0706e82 | 652 | for (;;) { |
948d887d JB |
653 | spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); |
654 | skb = skb_peek(&sta->ps_tx_buf[ac]); | |
57c4d7b4 | 655 | if (sta_info_buffer_expired(sta, skb)) |
948d887d | 656 | skb = __skb_dequeue(&sta->ps_tx_buf[ac]); |
836341a7 | 657 | else |
f0706e82 | 658 | skb = NULL; |
948d887d | 659 | spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); |
f0706e82 | 660 | |
60750397 JB |
661 | /* |
662 | * frames are queued in order, so if this one | |
663 | * hasn't expired yet (or we reached the end of | |
664 | * the queue) we can stop testing | |
665 | */ | |
836341a7 | 666 | if (!skb) |
f0706e82 | 667 | break; |
836341a7 | 668 | |
836341a7 | 669 | local->total_ps_buffered--; |
f4ea83dd | 670 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
671 | printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n", |
672 | sta->sta.addr); | |
f4ea83dd | 673 | #endif |
836341a7 | 674 | dev_kfree_skb(skb); |
f0706e82 | 675 | } |
3393a608 | 676 | |
60750397 JB |
677 | /* |
678 | * Finally, recalculate the TIM bit for this station -- it might | |
679 | * now be clear because the station was too slow to retrieve its | |
680 | * frames. | |
681 | */ | |
682 | sta_info_recalc_tim(sta); | |
683 | ||
684 | /* | |
685 | * Return whether there are any frames still buffered, this is | |
686 | * used to check whether the cleanup timer still needs to run, | |
687 | * if there are no frames we don't need to rearm the timer. | |
688 | */ | |
948d887d JB |
689 | return !(skb_queue_empty(&sta->ps_tx_buf[ac]) && |
690 | skb_queue_empty(&sta->tx_filtered[ac])); | |
691 | } | |
692 | ||
693 | static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, | |
694 | struct sta_info *sta) | |
695 | { | |
696 | bool have_buffered = false; | |
697 | int ac; | |
698 | ||
699 | /* This is only necessary for stations on BSS interfaces */ | |
700 | if (!sta->sdata->bss) | |
701 | return false; | |
702 | ||
703 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) | |
704 | have_buffered |= | |
705 | sta_info_cleanup_expire_buffered_ac(local, sta, ac); | |
706 | ||
707 | return have_buffered; | |
f0706e82 JB |
708 | } |
709 | ||
34e89507 | 710 | static int __must_check __sta_info_destroy(struct sta_info *sta) |
f0706e82 | 711 | { |
34e89507 JB |
712 | struct ieee80211_local *local; |
713 | struct ieee80211_sub_if_data *sdata; | |
948d887d | 714 | int ret, i, ac; |
42624d49 | 715 | struct tid_ampdu_tx *tid_tx; |
f0706e82 | 716 | |
34e89507 | 717 | might_sleep(); |
f0706e82 | 718 | |
34e89507 JB |
719 | if (!sta) |
720 | return -ENOENT; | |
5bb644a0 | 721 | |
34e89507 JB |
722 | local = sta->local; |
723 | sdata = sta->sdata; | |
f0706e82 | 724 | |
098a6070 JB |
725 | /* |
726 | * Before removing the station from the driver and | |
727 | * rate control, it might still start new aggregation | |
728 | * sessions -- block that to make sure the tear-down | |
729 | * will be sufficient. | |
730 | */ | |
c2c98fde | 731 | set_sta_flag(sta, WLAN_STA_BLOCK_BA); |
53f73c09 | 732 | ieee80211_sta_tear_down_BA_sessions(sta, true); |
098a6070 | 733 | |
34e89507 | 734 | ret = sta_info_hash_del(local, sta); |
34e89507 JB |
735 | if (ret) |
736 | return ret; | |
737 | ||
4d33960b JB |
738 | list_del(&sta->list); |
739 | ||
8cb23153 | 740 | mutex_lock(&local->key_mtx); |
e31b8213 | 741 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) |
40b275b6 | 742 | __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i])); |
e31b8213 | 743 | if (sta->ptk) |
40b275b6 | 744 | __ieee80211_key_free(key_mtx_dereference(local, sta->ptk)); |
8cb23153 | 745 | mutex_unlock(&local->key_mtx); |
34e89507 JB |
746 | |
747 | sta->dead = true; | |
748 | ||
c2c98fde JB |
749 | if (test_sta_flag(sta, WLAN_STA_PS_STA) || |
750 | test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { | |
34e89507 JB |
751 | BUG_ON(!sdata->bss); |
752 | ||
c2c98fde JB |
753 | clear_sta_flag(sta, WLAN_STA_PS_STA); |
754 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); | |
755 | ||
34e89507 | 756 | atomic_dec(&sdata->bss->num_sta_ps); |
c868cb35 | 757 | sta_info_recalc_tim(sta); |
34e89507 JB |
758 | } |
759 | ||
760 | local->num_sta--; | |
761 | local->sta_generation++; | |
762 | ||
763 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
a9b3cd7f | 764 | RCU_INIT_POINTER(sdata->u.vlan.sta, NULL); |
34e89507 | 765 | |
d9a7ddb0 JB |
766 | while (sta->sta_state > IEEE80211_STA_NONE) |
767 | sta_info_move_state(sta, sta->sta_state - 1); | |
768 | ||
34e89507 JB |
769 | if (sta->uploaded) { |
770 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
771 | sdata = container_of(sdata->bss, | |
772 | struct ieee80211_sub_if_data, | |
773 | u.ap); | |
774 | drv_sta_remove(local, sdata, &sta->sta); | |
775 | sdata = sta->sdata; | |
776 | } | |
777 | ||
e64b3795 JB |
778 | /* |
779 | * At this point, after we wait for an RCU grace period, | |
780 | * neither mac80211 nor the driver can reference this | |
781 | * sta struct any more except by still existing timers | |
782 | * associated with this station that we clean up below. | |
783 | */ | |
784 | synchronize_rcu(); | |
785 | ||
948d887d JB |
786 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
787 | local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]); | |
788 | __skb_queue_purge(&sta->ps_tx_buf[ac]); | |
789 | __skb_queue_purge(&sta->tx_filtered[ac]); | |
790 | } | |
c868cb35 | 791 | |
34e89507 | 792 | #ifdef CONFIG_MAC80211_MESH |
e64b3795 | 793 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
34e89507 | 794 | mesh_accept_plinks_update(sdata); |
34e89507 JB |
795 | #endif |
796 | ||
797 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0fb9a9ec | 798 | wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr); |
34e89507 JB |
799 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
800 | cancel_work_sync(&sta->drv_unblock_wk); | |
801 | ||
ec15e68b JM |
802 | cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL); |
803 | ||
34e89507 JB |
804 | rate_control_remove_sta_debugfs(sta); |
805 | ieee80211_sta_debugfs_remove(sta); | |
806 | ||
807 | #ifdef CONFIG_MAC80211_MESH | |
808 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) { | |
809 | mesh_plink_deactivate(sta); | |
810 | del_timer_sync(&sta->plink_timer); | |
811 | } | |
812 | #endif | |
813 | ||
151a02f6 JB |
814 | /* |
815 | * Destroy aggregation state here. It would be nice to wait for the | |
816 | * driver to finish aggregation stop and then clean up, but for now | |
817 | * drivers have to handle aggregation stop being requested, followed | |
818 | * directly by station destruction. | |
42624d49 YAP |
819 | */ |
820 | for (i = 0; i < STA_TID_NUM; i++) { | |
151a02f6 | 821 | tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]); |
27bf8882 | 822 | if (!tid_tx) |
42624d49 | 823 | continue; |
151a02f6 JB |
824 | __skb_queue_purge(&tid_tx->pending); |
825 | kfree(tid_tx); | |
42624d49 YAP |
826 | } |
827 | ||
d9a7ddb0 | 828 | sta_info_free(local, sta); |
34e89507 JB |
829 | |
830 | return 0; | |
4d6141c3 JS |
831 | } |
832 | ||
34e89507 | 833 | int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) |
4d6141c3 | 834 | { |
34e89507 JB |
835 | struct sta_info *sta; |
836 | int ret; | |
4d6141c3 | 837 | |
34e89507 | 838 | mutex_lock(&sdata->local->sta_mtx); |
2a33bee2 | 839 | sta = sta_info_get_rx(sdata, addr); |
34e89507 JB |
840 | ret = __sta_info_destroy(sta); |
841 | mutex_unlock(&sdata->local->sta_mtx); | |
4d6141c3 JS |
842 | |
843 | return ret; | |
844 | } | |
845 | ||
34e89507 JB |
846 | int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, |
847 | const u8 *addr) | |
e9f207f0 | 848 | { |
34e89507 JB |
849 | struct sta_info *sta; |
850 | int ret; | |
e9f207f0 | 851 | |
34e89507 | 852 | mutex_lock(&sdata->local->sta_mtx); |
2a33bee2 | 853 | sta = sta_info_get_bss_rx(sdata, addr); |
34e89507 JB |
854 | ret = __sta_info_destroy(sta); |
855 | mutex_unlock(&sdata->local->sta_mtx); | |
d0709a65 | 856 | |
34e89507 JB |
857 | return ret; |
858 | } | |
e9f207f0 | 859 | |
34e89507 JB |
860 | static void sta_info_cleanup(unsigned long data) |
861 | { | |
862 | struct ieee80211_local *local = (struct ieee80211_local *) data; | |
863 | struct sta_info *sta; | |
3393a608 | 864 | bool timer_needed = false; |
34e89507 JB |
865 | |
866 | rcu_read_lock(); | |
867 | list_for_each_entry_rcu(sta, &local->sta_list, list) | |
3393a608 JO |
868 | if (sta_info_cleanup_expire_buffered(local, sta)) |
869 | timer_needed = true; | |
34e89507 | 870 | rcu_read_unlock(); |
e9f207f0 | 871 | |
34e89507 JB |
872 | if (local->quiescing) |
873 | return; | |
d0709a65 | 874 | |
3393a608 JO |
875 | if (!timer_needed) |
876 | return; | |
877 | ||
26d59535 JB |
878 | mod_timer(&local->sta_cleanup, |
879 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); | |
e9f207f0 | 880 | } |
e9f207f0 | 881 | |
f0706e82 JB |
882 | void sta_info_init(struct ieee80211_local *local) |
883 | { | |
4d33960b | 884 | spin_lock_init(&local->tim_lock); |
34e89507 | 885 | mutex_init(&local->sta_mtx); |
f0706e82 | 886 | INIT_LIST_HEAD(&local->sta_list); |
f0706e82 | 887 | |
b24b8a24 PE |
888 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
889 | (unsigned long)local); | |
f0706e82 JB |
890 | } |
891 | ||
892 | void sta_info_stop(struct ieee80211_local *local) | |
893 | { | |
f0706e82 | 894 | del_timer(&local->sta_cleanup); |
be8755e1 | 895 | sta_info_flush(local, NULL); |
f0706e82 JB |
896 | } |
897 | ||
f0706e82 JB |
898 | /** |
899 | * sta_info_flush - flush matching STA entries from the STA table | |
44213b5e JB |
900 | * |
901 | * Returns the number of removed STA entries. | |
902 | * | |
f0706e82 | 903 | * @local: local interface data |
d0709a65 | 904 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
f0706e82 | 905 | */ |
44213b5e | 906 | int sta_info_flush(struct ieee80211_local *local, |
af8cdcd8 | 907 | struct ieee80211_sub_if_data *sdata) |
f0706e82 JB |
908 | { |
909 | struct sta_info *sta, *tmp; | |
44213b5e | 910 | int ret = 0; |
f0706e82 | 911 | |
d0709a65 | 912 | might_sleep(); |
be8755e1 | 913 | |
34e89507 | 914 | mutex_lock(&local->sta_mtx); |
d0709a65 | 915 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
34e89507 JB |
916 | if (!sdata || sdata == sta->sdata) |
917 | WARN_ON(__sta_info_destroy(sta)); | |
be8755e1 | 918 | } |
34e89507 | 919 | mutex_unlock(&local->sta_mtx); |
44213b5e JB |
920 | |
921 | return ret; | |
f0706e82 | 922 | } |
dc6676b7 | 923 | |
24723d1b JB |
924 | void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, |
925 | unsigned long exp_time) | |
926 | { | |
927 | struct ieee80211_local *local = sdata->local; | |
928 | struct sta_info *sta, *tmp; | |
24723d1b | 929 | |
34e89507 | 930 | mutex_lock(&local->sta_mtx); |
e46a2cf9 MSS |
931 | |
932 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
ec2b774e ML |
933 | if (sdata != sta->sdata) |
934 | continue; | |
935 | ||
24723d1b JB |
936 | if (time_after(jiffies, sta->last_rx + exp_time)) { |
937 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
0c68ae26 | 938 | printk(KERN_DEBUG "%s: expiring inactive STA %pM\n", |
47846c9b | 939 | sdata->name, sta->sta.addr); |
24723d1b | 940 | #endif |
34e89507 | 941 | WARN_ON(__sta_info_destroy(sta)); |
24723d1b | 942 | } |
e46a2cf9 MSS |
943 | } |
944 | ||
34e89507 | 945 | mutex_unlock(&local->sta_mtx); |
24723d1b | 946 | } |
17741cdc | 947 | |
686b9cb9 BG |
948 | struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, |
949 | const u8 *addr, | |
950 | const u8 *localaddr) | |
17741cdc | 951 | { |
abe60632 | 952 | struct sta_info *sta, *nxt; |
17741cdc | 953 | |
686b9cb9 BG |
954 | /* |
955 | * Just return a random station if localaddr is NULL | |
956 | * ... first in list. | |
957 | */ | |
f7c65594 | 958 | for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { |
686b9cb9 BG |
959 | if (localaddr && |
960 | compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0) | |
961 | continue; | |
f7c65594 JB |
962 | if (!sta->uploaded) |
963 | return NULL; | |
abe60632 | 964 | return &sta->sta; |
f7c65594 JB |
965 | } |
966 | ||
abe60632 | 967 | return NULL; |
17741cdc | 968 | } |
686b9cb9 | 969 | EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); |
5ed176e1 JB |
970 | |
971 | struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, | |
972 | const u8 *addr) | |
973 | { | |
f7c65594 | 974 | struct sta_info *sta; |
5ed176e1 JB |
975 | |
976 | if (!vif) | |
977 | return NULL; | |
978 | ||
f7c65594 JB |
979 | sta = sta_info_get_bss(vif_to_sdata(vif), addr); |
980 | if (!sta) | |
981 | return NULL; | |
982 | ||
983 | if (!sta->uploaded) | |
984 | return NULL; | |
5ed176e1 | 985 | |
f7c65594 | 986 | return &sta->sta; |
5ed176e1 | 987 | } |
17741cdc | 988 | EXPORT_SYMBOL(ieee80211_find_sta); |
af818581 | 989 | |
50a9432d JB |
990 | static void clear_sta_ps_flags(void *_sta) |
991 | { | |
992 | struct sta_info *sta = _sta; | |
993 | ||
c2c98fde JB |
994 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
995 | clear_sta_flag(sta, WLAN_STA_PS_STA); | |
50a9432d JB |
996 | } |
997 | ||
af818581 JB |
998 | /* powersave support code */ |
999 | void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) | |
1000 | { | |
1001 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
1002 | struct ieee80211_local *local = sdata->local; | |
948d887d JB |
1003 | struct sk_buff_head pending; |
1004 | int filtered = 0, buffered = 0, ac; | |
1005 | ||
c2c98fde | 1006 | clear_sta_flag(sta, WLAN_STA_SP); |
47086fc5 | 1007 | |
948d887d JB |
1008 | BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1); |
1009 | sta->driver_buffered_tids = 0; | |
af818581 | 1010 | |
d057e5a3 AN |
1011 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) |
1012 | drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); | |
af818581 | 1013 | |
948d887d | 1014 | skb_queue_head_init(&pending); |
af818581 JB |
1015 | |
1016 | /* Send all buffered frames to the station */ | |
948d887d JB |
1017 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
1018 | int count = skb_queue_len(&pending), tmp; | |
1019 | ||
1020 | skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending); | |
1021 | tmp = skb_queue_len(&pending); | |
1022 | filtered += tmp - count; | |
1023 | count = tmp; | |
1024 | ||
1025 | skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending); | |
1026 | tmp = skb_queue_len(&pending); | |
1027 | buffered += tmp - count; | |
1028 | } | |
1029 | ||
1030 | ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta); | |
1031 | ||
af818581 JB |
1032 | local->total_ps_buffered -= buffered; |
1033 | ||
c868cb35 JB |
1034 | sta_info_recalc_tim(sta); |
1035 | ||
af818581 JB |
1036 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
1037 | printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " | |
47846c9b | 1038 | "since STA not sleeping anymore\n", sdata->name, |
948d887d | 1039 | sta->sta.addr, sta->sta.aid, filtered, buffered); |
af818581 JB |
1040 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1041 | } | |
1042 | ||
ce662b44 JB |
1043 | static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata, |
1044 | struct sta_info *sta, int tid, | |
40b96408 | 1045 | enum ieee80211_frame_release_type reason) |
af818581 | 1046 | { |
af818581 | 1047 | struct ieee80211_local *local = sdata->local; |
ce662b44 | 1048 | struct ieee80211_qos_hdr *nullfunc; |
af818581 | 1049 | struct sk_buff *skb; |
ce662b44 JB |
1050 | int size = sizeof(*nullfunc); |
1051 | __le16 fc; | |
c2c98fde | 1052 | bool qos = test_sta_flag(sta, WLAN_STA_WME); |
ce662b44 | 1053 | struct ieee80211_tx_info *info; |
af818581 | 1054 | |
ce662b44 JB |
1055 | if (qos) { |
1056 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | | |
1057 | IEEE80211_STYPE_QOS_NULLFUNC | | |
1058 | IEEE80211_FCTL_FROMDS); | |
1059 | } else { | |
1060 | size -= 2; | |
1061 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | | |
1062 | IEEE80211_STYPE_NULLFUNC | | |
1063 | IEEE80211_FCTL_FROMDS); | |
af818581 | 1064 | } |
af818581 | 1065 | |
ce662b44 JB |
1066 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + size); |
1067 | if (!skb) | |
1068 | return; | |
1069 | ||
1070 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1071 | ||
1072 | nullfunc = (void *) skb_put(skb, size); | |
1073 | nullfunc->frame_control = fc; | |
1074 | nullfunc->duration_id = 0; | |
1075 | memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); | |
1076 | memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); | |
1077 | memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN); | |
1078 | ||
59b66255 JB |
1079 | skb->priority = tid; |
1080 | skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); | |
ce662b44 | 1081 | if (qos) { |
ce662b44 JB |
1082 | nullfunc->qos_ctrl = cpu_to_le16(tid); |
1083 | ||
40b96408 | 1084 | if (reason == IEEE80211_FRAME_RELEASE_UAPSD) |
ce662b44 JB |
1085 | nullfunc->qos_ctrl |= |
1086 | cpu_to_le16(IEEE80211_QOS_CTL_EOSP); | |
1087 | } | |
1088 | ||
1089 | info = IEEE80211_SKB_CB(skb); | |
1090 | ||
1091 | /* | |
1092 | * Tell TX path to send this frame even though the | |
1093 | * STA may still remain is PS mode after this frame | |
deeaee19 JB |
1094 | * exchange. Also set EOSP to indicate this packet |
1095 | * ends the poll/service period. | |
ce662b44 | 1096 | */ |
deeaee19 JB |
1097 | info->flags |= IEEE80211_TX_CTL_POLL_RESPONSE | |
1098 | IEEE80211_TX_STATUS_EOSP | | |
1099 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
ce662b44 | 1100 | |
40b96408 JB |
1101 | drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false); |
1102 | ||
ce662b44 JB |
1103 | ieee80211_xmit(sdata, skb); |
1104 | } | |
1105 | ||
47086fc5 JB |
1106 | static void |
1107 | ieee80211_sta_ps_deliver_response(struct sta_info *sta, | |
1108 | int n_frames, u8 ignored_acs, | |
1109 | enum ieee80211_frame_release_type reason) | |
af818581 JB |
1110 | { |
1111 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
1112 | struct ieee80211_local *local = sdata->local; | |
4049e09a | 1113 | bool found = false; |
948d887d JB |
1114 | bool more_data = false; |
1115 | int ac; | |
4049e09a | 1116 | unsigned long driver_release_tids = 0; |
47086fc5 | 1117 | struct sk_buff_head frames; |
af818581 | 1118 | |
deeaee19 | 1119 | /* Service or PS-Poll period starts */ |
c2c98fde | 1120 | set_sta_flag(sta, WLAN_STA_SP); |
deeaee19 | 1121 | |
47086fc5 | 1122 | __skb_queue_head_init(&frames); |
948d887d JB |
1123 | |
1124 | /* | |
47086fc5 | 1125 | * Get response frame(s) and more data bit for it. |
948d887d JB |
1126 | */ |
1127 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { | |
4049e09a JB |
1128 | unsigned long tids; |
1129 | ||
47086fc5 | 1130 | if (ignored_acs & BIT(ac)) |
948d887d JB |
1131 | continue; |
1132 | ||
4049e09a JB |
1133 | tids = ieee80211_tids_for_ac(ac); |
1134 | ||
1135 | if (!found) { | |
1136 | driver_release_tids = sta->driver_buffered_tids & tids; | |
1137 | if (driver_release_tids) { | |
1138 | found = true; | |
1139 | } else { | |
47086fc5 JB |
1140 | struct sk_buff *skb; |
1141 | ||
1142 | while (n_frames > 0) { | |
1143 | skb = skb_dequeue(&sta->tx_filtered[ac]); | |
1144 | if (!skb) { | |
1145 | skb = skb_dequeue( | |
1146 | &sta->ps_tx_buf[ac]); | |
1147 | if (skb) | |
1148 | local->total_ps_buffered--; | |
1149 | } | |
1150 | if (!skb) | |
1151 | break; | |
1152 | n_frames--; | |
4049e09a | 1153 | found = true; |
47086fc5 JB |
1154 | __skb_queue_tail(&frames, skb); |
1155 | } | |
948d887d | 1156 | } |
948d887d | 1157 | |
4049e09a JB |
1158 | /* |
1159 | * If the driver has data on more than one TID then | |
1160 | * certainly there's more data if we release just a | |
1161 | * single frame now (from a single TID). | |
1162 | */ | |
47086fc5 JB |
1163 | if (reason == IEEE80211_FRAME_RELEASE_PSPOLL && |
1164 | hweight16(driver_release_tids) > 1) { | |
4049e09a JB |
1165 | more_data = true; |
1166 | driver_release_tids = | |
1167 | BIT(ffs(driver_release_tids) - 1); | |
1168 | break; | |
1169 | } | |
1170 | } | |
948d887d JB |
1171 | |
1172 | if (!skb_queue_empty(&sta->tx_filtered[ac]) || | |
1173 | !skb_queue_empty(&sta->ps_tx_buf[ac])) { | |
1174 | more_data = true; | |
1175 | break; | |
1176 | } | |
af818581 | 1177 | } |
af818581 | 1178 | |
4049e09a | 1179 | if (!found) { |
ce662b44 | 1180 | int tid; |
af818581 JB |
1181 | |
1182 | /* | |
ce662b44 JB |
1183 | * For PS-Poll, this can only happen due to a race condition |
1184 | * when we set the TIM bit and the station notices it, but | |
1185 | * before it can poll for the frame we expire it. | |
1186 | * | |
1187 | * For uAPSD, this is said in the standard (11.2.1.5 h): | |
1188 | * At each unscheduled SP for a non-AP STA, the AP shall | |
1189 | * attempt to transmit at least one MSDU or MMPDU, but no | |
1190 | * more than the value specified in the Max SP Length field | |
1191 | * in the QoS Capability element from delivery-enabled ACs, | |
1192 | * that are destined for the non-AP STA. | |
1193 | * | |
1194 | * Since we have no other MSDU/MMPDU, transmit a QoS null frame. | |
af818581 | 1195 | */ |
af818581 | 1196 | |
ce662b44 JB |
1197 | /* This will evaluate to 1, 3, 5 or 7. */ |
1198 | tid = 7 - ((ffs(~ignored_acs) - 1) << 1); | |
af818581 | 1199 | |
40b96408 | 1200 | ieee80211_send_null_response(sdata, sta, tid, reason); |
4049e09a JB |
1201 | return; |
1202 | } | |
af818581 | 1203 | |
47086fc5 JB |
1204 | if (!driver_release_tids) { |
1205 | struct sk_buff_head pending; | |
1206 | struct sk_buff *skb; | |
40b96408 JB |
1207 | int num = 0; |
1208 | u16 tids = 0; | |
af818581 | 1209 | |
47086fc5 | 1210 | skb_queue_head_init(&pending); |
af818581 | 1211 | |
47086fc5 JB |
1212 | while ((skb = __skb_dequeue(&frames))) { |
1213 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1214 | struct ieee80211_hdr *hdr = (void *) skb->data; | |
40b96408 JB |
1215 | u8 *qoshdr = NULL; |
1216 | ||
1217 | num++; | |
af818581 | 1218 | |
47086fc5 JB |
1219 | /* |
1220 | * Tell TX path to send this frame even though the | |
1221 | * STA may still remain is PS mode after this frame | |
1222 | * exchange. | |
1223 | */ | |
1224 | info->flags |= IEEE80211_TX_CTL_POLL_RESPONSE; | |
1225 | ||
1226 | /* | |
1227 | * Use MoreData flag to indicate whether there are | |
1228 | * more buffered frames for this STA | |
1229 | */ | |
24b9c373 | 1230 | if (more_data || !skb_queue_empty(&frames)) |
47086fc5 JB |
1231 | hdr->frame_control |= |
1232 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
24b9c373 JD |
1233 | else |
1234 | hdr->frame_control &= | |
1235 | cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
47086fc5 | 1236 | |
40b96408 JB |
1237 | if (ieee80211_is_data_qos(hdr->frame_control) || |
1238 | ieee80211_is_qos_nullfunc(hdr->frame_control)) | |
1239 | qoshdr = ieee80211_get_qos_ctl(hdr); | |
1240 | ||
1241 | /* set EOSP for the frame */ | |
47086fc5 | 1242 | if (reason == IEEE80211_FRAME_RELEASE_UAPSD && |
40b96408 JB |
1243 | qoshdr && skb_queue_empty(&frames)) |
1244 | *qoshdr |= IEEE80211_QOS_CTL_EOSP; | |
af818581 | 1245 | |
deeaee19 JB |
1246 | info->flags |= IEEE80211_TX_STATUS_EOSP | |
1247 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
1248 | ||
40b96408 JB |
1249 | if (qoshdr) |
1250 | tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK); | |
1251 | else | |
1252 | tids |= BIT(0); | |
1253 | ||
47086fc5 JB |
1254 | __skb_queue_tail(&pending, skb); |
1255 | } | |
af818581 | 1256 | |
40b96408 JB |
1257 | drv_allow_buffered_frames(local, sta, tids, num, |
1258 | reason, more_data); | |
1259 | ||
47086fc5 | 1260 | ieee80211_add_pending_skbs(local, &pending); |
af818581 | 1261 | |
c868cb35 | 1262 | sta_info_recalc_tim(sta); |
af818581 JB |
1263 | } else { |
1264 | /* | |
4049e09a JB |
1265 | * We need to release a frame that is buffered somewhere in the |
1266 | * driver ... it'll have to handle that. | |
1267 | * Note that, as per the comment above, it'll also have to see | |
1268 | * if there is more than just one frame on the specific TID that | |
1269 | * we're releasing from, and it needs to set the more-data bit | |
1270 | * accordingly if we tell it that there's no more data. If we do | |
1271 | * tell it there's more data, then of course the more-data bit | |
1272 | * needs to be set anyway. | |
1273 | */ | |
1274 | drv_release_buffered_frames(local, sta, driver_release_tids, | |
47086fc5 | 1275 | n_frames, reason, more_data); |
4049e09a JB |
1276 | |
1277 | /* | |
1278 | * Note that we don't recalculate the TIM bit here as it would | |
1279 | * most likely have no effect at all unless the driver told us | |
1280 | * that the TID became empty before returning here from the | |
1281 | * release function. | |
1282 | * Either way, however, when the driver tells us that the TID | |
1283 | * became empty we'll do the TIM recalculation. | |
af818581 | 1284 | */ |
af818581 JB |
1285 | } |
1286 | } | |
1287 | ||
47086fc5 JB |
1288 | void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) |
1289 | { | |
1290 | u8 ignore_for_response = sta->sta.uapsd_queues; | |
1291 | ||
1292 | /* | |
1293 | * If all ACs are delivery-enabled then we should reply | |
1294 | * from any of them, if only some are enabled we reply | |
1295 | * only from the non-enabled ones. | |
1296 | */ | |
1297 | if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1) | |
1298 | ignore_for_response = 0; | |
1299 | ||
1300 | ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response, | |
1301 | IEEE80211_FRAME_RELEASE_PSPOLL); | |
1302 | } | |
1303 | ||
1304 | void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta) | |
1305 | { | |
1306 | int n_frames = sta->sta.max_sp; | |
1307 | u8 delivery_enabled = sta->sta.uapsd_queues; | |
1308 | ||
1309 | /* | |
1310 | * If we ever grow support for TSPEC this might happen if | |
1311 | * the TSPEC update from hostapd comes in between a trigger | |
1312 | * frame setting WLAN_STA_UAPSD in the RX path and this | |
1313 | * actually getting called. | |
1314 | */ | |
1315 | if (!delivery_enabled) | |
1316 | return; | |
1317 | ||
47086fc5 JB |
1318 | switch (sta->sta.max_sp) { |
1319 | case 1: | |
1320 | n_frames = 2; | |
1321 | break; | |
1322 | case 2: | |
1323 | n_frames = 4; | |
1324 | break; | |
1325 | case 3: | |
1326 | n_frames = 6; | |
1327 | break; | |
1328 | case 0: | |
1329 | /* XXX: what is a good value? */ | |
1330 | n_frames = 8; | |
1331 | break; | |
1332 | } | |
1333 | ||
1334 | ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled, | |
1335 | IEEE80211_FRAME_RELEASE_UAPSD); | |
1336 | } | |
1337 | ||
af818581 JB |
1338 | void ieee80211_sta_block_awake(struct ieee80211_hw *hw, |
1339 | struct ieee80211_sta *pubsta, bool block) | |
1340 | { | |
1341 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
1342 | ||
b5878a2d JB |
1343 | trace_api_sta_block_awake(sta->local, pubsta, block); |
1344 | ||
af818581 | 1345 | if (block) |
c2c98fde JB |
1346 | set_sta_flag(sta, WLAN_STA_PS_DRIVER); |
1347 | else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) | |
af818581 JB |
1348 | ieee80211_queue_work(hw, &sta->drv_unblock_wk); |
1349 | } | |
1350 | EXPORT_SYMBOL(ieee80211_sta_block_awake); | |
dcf55fb5 | 1351 | |
37fbd908 JB |
1352 | void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta) |
1353 | { | |
1354 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
1355 | struct ieee80211_local *local = sta->local; | |
1356 | struct sk_buff *skb; | |
1357 | struct skb_eosp_msg_data *data; | |
1358 | ||
1359 | trace_api_eosp(local, pubsta); | |
1360 | ||
1361 | skb = alloc_skb(0, GFP_ATOMIC); | |
1362 | if (!skb) { | |
1363 | /* too bad ... but race is better than loss */ | |
1364 | clear_sta_flag(sta, WLAN_STA_SP); | |
1365 | return; | |
1366 | } | |
1367 | ||
1368 | data = (void *)skb->cb; | |
1369 | memcpy(data->sta, pubsta->addr, ETH_ALEN); | |
1370 | memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN); | |
1371 | skb->pkt_type = IEEE80211_EOSP_MSG; | |
1372 | skb_queue_tail(&local->skb_queue, skb); | |
1373 | tasklet_schedule(&local->tasklet); | |
1374 | } | |
1375 | EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe); | |
1376 | ||
042ec453 JB |
1377 | void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta, |
1378 | u8 tid, bool buffered) | |
dcf55fb5 FF |
1379 | { |
1380 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
1381 | ||
948d887d | 1382 | if (WARN_ON(tid >= STA_TID_NUM)) |
042ec453 JB |
1383 | return; |
1384 | ||
948d887d JB |
1385 | if (buffered) |
1386 | set_bit(tid, &sta->driver_buffered_tids); | |
1387 | else | |
1388 | clear_bit(tid, &sta->driver_buffered_tids); | |
1389 | ||
c868cb35 | 1390 | sta_info_recalc_tim(sta); |
dcf55fb5 | 1391 | } |
042ec453 | 1392 | EXPORT_SYMBOL(ieee80211_sta_set_buffered); |
d9a7ddb0 JB |
1393 | |
1394 | int sta_info_move_state_checked(struct sta_info *sta, | |
1395 | enum ieee80211_sta_state new_state) | |
1396 | { | |
8bf11d8d | 1397 | might_sleep(); |
d9a7ddb0 JB |
1398 | |
1399 | if (sta->sta_state == new_state) | |
1400 | return 0; | |
1401 | ||
1402 | switch (new_state) { | |
1403 | case IEEE80211_STA_NONE: | |
1404 | if (sta->sta_state == IEEE80211_STA_AUTH) | |
1405 | clear_bit(WLAN_STA_AUTH, &sta->_flags); | |
1406 | else | |
1407 | return -EINVAL; | |
1408 | break; | |
1409 | case IEEE80211_STA_AUTH: | |
1410 | if (sta->sta_state == IEEE80211_STA_NONE) | |
1411 | set_bit(WLAN_STA_AUTH, &sta->_flags); | |
1412 | else if (sta->sta_state == IEEE80211_STA_ASSOC) | |
1413 | clear_bit(WLAN_STA_ASSOC, &sta->_flags); | |
1414 | else | |
1415 | return -EINVAL; | |
1416 | break; | |
1417 | case IEEE80211_STA_ASSOC: | |
29623892 | 1418 | if (sta->sta_state == IEEE80211_STA_AUTH) { |
d9a7ddb0 | 1419 | set_bit(WLAN_STA_ASSOC, &sta->_flags); |
29623892 JB |
1420 | } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) { |
1421 | if (sta->sdata->vif.type == NL80211_IFTYPE_AP) | |
1422 | atomic_dec(&sta->sdata->u.ap.num_sta_authorized); | |
d9a7ddb0 | 1423 | clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags); |
29623892 | 1424 | } else |
d9a7ddb0 JB |
1425 | return -EINVAL; |
1426 | break; | |
1427 | case IEEE80211_STA_AUTHORIZED: | |
29623892 JB |
1428 | if (sta->sta_state == IEEE80211_STA_ASSOC) { |
1429 | if (sta->sdata->vif.type == NL80211_IFTYPE_AP) | |
1430 | atomic_inc(&sta->sdata->u.ap.num_sta_authorized); | |
d9a7ddb0 | 1431 | set_bit(WLAN_STA_AUTHORIZED, &sta->_flags); |
29623892 | 1432 | } else |
d9a7ddb0 JB |
1433 | return -EINVAL; |
1434 | break; | |
1435 | default: | |
1436 | WARN(1, "invalid state %d", new_state); | |
1437 | return -EINVAL; | |
1438 | } | |
1439 | ||
1440 | printk(KERN_DEBUG "%s: moving STA %pM to state %d\n", | |
1441 | sta->sdata->name, sta->sta.addr, new_state); | |
1442 | sta->sta_state = new_state; | |
1443 | ||
1444 | return 0; | |
1445 | } |