?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
e1000: fix Tx hangs by disabling 64-bit DMA
[linux-2.6/cjktty.git] / net / mac80211 / mlme.c
blob0cb822cc12e9c52618ddb18d5503db43765b9f11
1 /*
2 * BSS client mode implementation
3 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 * Copyright 2004, Instant802 Networks, Inc.
5 * Copyright 2005, Devicescape Software, Inc.
6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <linux/slab.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29 #include "led.h"
30
31 #define IEEE80211_MAX_PROBE_TRIES 5
32
33 /*
34 * beacon loss detection timeout
35 * XXX: should depend on beacon interval
36 */
37 #define IEEE80211_BEACON_LOSS_TIME (2 * HZ)
38 /*
39 * Time the connection can be idle before we probe
40 * it to see if we can still talk to the AP.
41 */
42 #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ)
43 /*
44 * Time we wait for a probe response after sending
45 * a probe request because of beacon loss or for
46 * checking the connection still works.
47 */
48 #define IEEE80211_PROBE_WAIT (HZ / 2)
49
50 /*
51 * Weight given to the latest Beacon frame when calculating average signal
52 * strength for Beacon frames received in the current BSS. This must be
53 * between 1 and 15.
54 */
55 #define IEEE80211_SIGNAL_AVE_WEIGHT 3
56
57 /*
58 * How many Beacon frames need to have been used in average signal strength
59 * before starting to indicate signal change events.
60 */
61 #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4
62
63 #define TMR_RUNNING_TIMER 0
64 #define TMR_RUNNING_CHANSW 1
65
66 /*
67 * All cfg80211 functions have to be called outside a locked
68 * section so that they can acquire a lock themselves... This
69 * is much simpler than queuing up things in cfg80211, but we
70 * do need some indirection for that here.
71 */
72 enum rx_mgmt_action {
73 /* no action required */
74 RX_MGMT_NONE,
75
76 /* caller must call cfg80211_send_rx_auth() */
77 RX_MGMT_CFG80211_AUTH,
78
79 /* caller must call cfg80211_send_rx_assoc() */
80 RX_MGMT_CFG80211_ASSOC,
81
82 /* caller must call cfg80211_send_deauth() */
83 RX_MGMT_CFG80211_DEAUTH,
84
85 /* caller must call cfg80211_send_disassoc() */
86 RX_MGMT_CFG80211_DISASSOC,
87
88 /* caller must tell cfg80211 about internal error */
89 RX_MGMT_CFG80211_ASSOC_ERROR,
90 };
91
92 /* utils */
93 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
94 {
95 WARN_ON(!mutex_is_locked(&ifmgd->mtx));
96 }
97
98 /*
99 * We can have multiple work items (and connection probing)
100 * scheduling this timer, but we need to take care to only
101 * reschedule it when it should fire _earlier_ than it was
102 * asked for before, or if it's not pending right now. This
103 * function ensures that. Note that it then is required to
104 * run this function for all timeouts after the first one
105 * has happened -- the work that runs from this timer will
106 * do that.
107 */
108 static void run_again(struct ieee80211_if_managed *ifmgd,
109 unsigned long timeout)
110 {
111 ASSERT_MGD_MTX(ifmgd);
112
113 if (!timer_pending(&ifmgd->timer) ||
114 time_before(timeout, ifmgd->timer.expires))
115 mod_timer(&ifmgd->timer, timeout);
116 }
117
118 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
119 {
120 if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
121 return;
122
123 mod_timer(&sdata->u.mgd.bcn_mon_timer,
124 round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
125 }
126
127 static int ecw2cw(int ecw)
128 {
129 return (1 << ecw) - 1;
130 }
131
132 /*
133 * ieee80211_enable_ht should be called only after the operating band
134 * has been determined as ht configuration depends on the hw's
135 * HT abilities for a specific band.
136 */
137 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
138 struct ieee80211_ht_info *hti,
139 const u8 *bssid, u16 ap_ht_cap_flags)
140 {
141 struct ieee80211_local *local = sdata->local;
142 struct ieee80211_supported_band *sband;
143 struct sta_info *sta;
144 u32 changed = 0;
145 u16 ht_opmode;
146 bool enable_ht = true;
147 enum nl80211_channel_type prev_chantype;
148 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
149
150 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
151
152 prev_chantype = sdata->vif.bss_conf.channel_type;
153
154 /* HT is not supported */
155 if (!sband->ht_cap.ht_supported)
156 enable_ht = false;
157
158 /* check that channel matches the right operating channel */
159 if (local->hw.conf.channel->center_freq !=
160 ieee80211_channel_to_frequency(hti->control_chan))
161 enable_ht = false;
162
163 if (enable_ht) {
164 channel_type = NL80211_CHAN_HT20;
165
166 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
167 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
168 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
169 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
170 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
171 if (!(local->hw.conf.channel->flags &
172 IEEE80211_CHAN_NO_HT40PLUS))
173 channel_type = NL80211_CHAN_HT40PLUS;
174 break;
175 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
176 if (!(local->hw.conf.channel->flags &
177 IEEE80211_CHAN_NO_HT40MINUS))
178 channel_type = NL80211_CHAN_HT40MINUS;
179 break;
180 }
181 }
182 }
183
184 if (local->tmp_channel)
185 local->tmp_channel_type = channel_type;
186
187 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
188 /* can only fail due to HT40+/- mismatch */
189 channel_type = NL80211_CHAN_HT20;
190 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
191 }
192
193 /* channel_type change automatically detected */
194 ieee80211_hw_config(local, 0);
195
196 if (prev_chantype != channel_type) {
197 rcu_read_lock();
198 sta = sta_info_get(sdata, bssid);
199 if (sta)
200 rate_control_rate_update(local, sband, sta,
201 IEEE80211_RC_HT_CHANGED,
202 channel_type);
203 rcu_read_unlock();
204 }
205
206 ht_opmode = le16_to_cpu(hti->operation_mode);
207
208 /* if bss configuration changed store the new one */
209 if (sdata->ht_opmode_valid != enable_ht ||
210 sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
211 prev_chantype != channel_type) {
212 changed |= BSS_CHANGED_HT;
213 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
214 sdata->ht_opmode_valid = enable_ht;
215 }
216
217 return changed;
218 }
219
220 /* frame sending functions */
221
222 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
223 const u8 *bssid, u16 stype, u16 reason,
224 void *cookie, bool send_frame)
225 {
226 struct ieee80211_local *local = sdata->local;
227 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
228 struct sk_buff *skb;
229 struct ieee80211_mgmt *mgmt;
230
231 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
232 if (!skb) {
233 printk(KERN_DEBUG "%s: failed to allocate buffer for "
234 "deauth/disassoc frame\n", sdata->name);
235 return;
236 }
237 skb_reserve(skb, local->hw.extra_tx_headroom);
238
239 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
240 memset(mgmt, 0, 24);
241 memcpy(mgmt->da, bssid, ETH_ALEN);
242 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
243 memcpy(mgmt->bssid, bssid, ETH_ALEN);
244 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
245 skb_put(skb, 2);
246 /* u.deauth.reason_code == u.disassoc.reason_code */
247 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
248
249 if (stype == IEEE80211_STYPE_DEAUTH)
250 if (cookie)
251 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
252 else
253 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
254 else
255 if (cookie)
256 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
257 else
258 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
259 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
260 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
261
262 if (send_frame)
263 ieee80211_tx_skb(sdata, skb);
264 else
265 kfree_skb(skb);
266 }
267
268 void ieee80211_send_pspoll(struct ieee80211_local *local,
269 struct ieee80211_sub_if_data *sdata)
270 {
271 struct ieee80211_pspoll *pspoll;
272 struct sk_buff *skb;
273
274 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
275 if (!skb)
276 return;
277
278 pspoll = (struct ieee80211_pspoll *) skb->data;
279 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
280
281 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
282 ieee80211_tx_skb(sdata, skb);
283 }
284
285 void ieee80211_send_nullfunc(struct ieee80211_local *local,
286 struct ieee80211_sub_if_data *sdata,
287 int powersave)
288 {
289 struct sk_buff *skb;
290 struct ieee80211_hdr_3addr *nullfunc;
291
292 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
293 if (!skb)
294 return;
295
296 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
297 if (powersave)
298 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
299
300 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
301 ieee80211_tx_skb(sdata, skb);
302 }
303
304 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
305 struct ieee80211_sub_if_data *sdata)
306 {
307 struct sk_buff *skb;
308 struct ieee80211_hdr *nullfunc;
309 __le16 fc;
310
311 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
312 return;
313
314 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
315 if (!skb) {
316 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
317 "nullfunc frame\n", sdata->name);
318 return;
319 }
320 skb_reserve(skb, local->hw.extra_tx_headroom);
321
322 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
323 memset(nullfunc, 0, 30);
324 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
325 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
326 nullfunc->frame_control = fc;
327 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
328 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
329 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
330 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
331
332 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
333 ieee80211_tx_skb(sdata, skb);
334 }
335
336 /* spectrum management related things */
337 static void ieee80211_chswitch_work(struct work_struct *work)
338 {
339 struct ieee80211_sub_if_data *sdata =
340 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
341 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
342
343 if (!ieee80211_sdata_running(sdata))
344 return;
345
346 mutex_lock(&ifmgd->mtx);
347 if (!ifmgd->associated)
348 goto out;
349
350 sdata->local->oper_channel = sdata->local->csa_channel;
351 if (!sdata->local->ops->channel_switch) {
352 /* call "hw_config" only if doing sw channel switch */
353 ieee80211_hw_config(sdata->local,
354 IEEE80211_CONF_CHANGE_CHANNEL);
355 }
356
357 /* XXX: shouldn't really modify cfg80211-owned data! */
358 ifmgd->associated->channel = sdata->local->oper_channel;
359
360 ieee80211_wake_queues_by_reason(&sdata->local->hw,
361 IEEE80211_QUEUE_STOP_REASON_CSA);
362 out:
363 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
364 mutex_unlock(&ifmgd->mtx);
365 }
366
367 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
368 {
369 struct ieee80211_sub_if_data *sdata;
370 struct ieee80211_if_managed *ifmgd;
371
372 sdata = vif_to_sdata(vif);
373 ifmgd = &sdata->u.mgd;
374
375 trace_api_chswitch_done(sdata, success);
376 if (!success) {
377 /*
378 * If the channel switch was not successful, stay
379 * around on the old channel. We currently lack
380 * good handling of this situation, possibly we
381 * should just drop the association.
382 */
383 sdata->local->csa_channel = sdata->local->oper_channel;
384 }
385
386 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
387 }
388 EXPORT_SYMBOL(ieee80211_chswitch_done);
389
390 static void ieee80211_chswitch_timer(unsigned long data)
391 {
392 struct ieee80211_sub_if_data *sdata =
393 (struct ieee80211_sub_if_data *) data;
394 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
395
396 if (sdata->local->quiescing) {
397 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
398 return;
399 }
400
401 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
402 }
403
404 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
405 struct ieee80211_channel_sw_ie *sw_elem,
406 struct ieee80211_bss *bss,
407 u64 timestamp)
408 {
409 struct cfg80211_bss *cbss =
410 container_of((void *)bss, struct cfg80211_bss, priv);
411 struct ieee80211_channel *new_ch;
412 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
413 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
414
415 ASSERT_MGD_MTX(ifmgd);
416
417 if (!ifmgd->associated)
418 return;
419
420 if (sdata->local->scanning)
421 return;
422
423 /* Disregard subsequent beacons if we are already running a timer
424 processing a CSA */
425
426 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
427 return;
428
429 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
430 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
431 return;
432
433 sdata->local->csa_channel = new_ch;
434
435 if (sdata->local->ops->channel_switch) {
436 /* use driver's channel switch callback */
437 struct ieee80211_channel_switch ch_switch;
438 memset(&ch_switch, 0, sizeof(ch_switch));
439 ch_switch.timestamp = timestamp;
440 if (sw_elem->mode) {
441 ch_switch.block_tx = true;
442 ieee80211_stop_queues_by_reason(&sdata->local->hw,
443 IEEE80211_QUEUE_STOP_REASON_CSA);
444 }
445 ch_switch.channel = new_ch;
446 ch_switch.count = sw_elem->count;
447 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
448 drv_channel_switch(sdata->local, &ch_switch);
449 return;
450 }
451
452 /* channel switch handled in software */
453 if (sw_elem->count <= 1) {
454 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
455 } else {
456 if (sw_elem->mode)
457 ieee80211_stop_queues_by_reason(&sdata->local->hw,
458 IEEE80211_QUEUE_STOP_REASON_CSA);
459 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
460 mod_timer(&ifmgd->chswitch_timer,
461 jiffies +
462 msecs_to_jiffies(sw_elem->count *
463 cbss->beacon_interval));
464 }
465 }
466
467 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
468 u16 capab_info, u8 *pwr_constr_elem,
469 u8 pwr_constr_elem_len)
470 {
471 struct ieee80211_conf *conf = &sdata->local->hw.conf;
472
473 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
474 return;
475
476 /* Power constraint IE length should be 1 octet */
477 if (pwr_constr_elem_len != 1)
478 return;
479
480 if ((*pwr_constr_elem <= conf->channel->max_power) &&
481 (*pwr_constr_elem != sdata->local->power_constr_level)) {
482 sdata->local->power_constr_level = *pwr_constr_elem;
483 ieee80211_hw_config(sdata->local, 0);
484 }
485 }
486
487 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
488 {
489 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
490 struct ieee80211_local *local = sdata->local;
491 struct ieee80211_conf *conf = &local->hw.conf;
492
493 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
494 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
495 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
496
497 local->disable_dynamic_ps = false;
498 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
499 }
500 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
501
502 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
503 {
504 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
505 struct ieee80211_local *local = sdata->local;
506 struct ieee80211_conf *conf = &local->hw.conf;
507
508 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
509 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
510 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
511
512 local->disable_dynamic_ps = true;
513 conf->dynamic_ps_timeout = 0;
514 del_timer_sync(&local->dynamic_ps_timer);
515 ieee80211_queue_work(&local->hw,
516 &local->dynamic_ps_enable_work);
517 }
518 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
519
520 /* powersave */
521 static void ieee80211_enable_ps(struct ieee80211_local *local,
522 struct ieee80211_sub_if_data *sdata)
523 {
524 struct ieee80211_conf *conf = &local->hw.conf;
525
526 /*
527 * If we are scanning right now then the parameters will
528 * take effect when scan finishes.
529 */
530 if (local->scanning)
531 return;
532
533 if (conf->dynamic_ps_timeout > 0 &&
534 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
535 mod_timer(&local->dynamic_ps_timer, jiffies +
536 msecs_to_jiffies(conf->dynamic_ps_timeout));
537 } else {
538 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
539 ieee80211_send_nullfunc(local, sdata, 1);
540
541 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
542 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
543 return;
544
545 conf->flags |= IEEE80211_CONF_PS;
546 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
547 }
548 }
549
550 static void ieee80211_change_ps(struct ieee80211_local *local)
551 {
552 struct ieee80211_conf *conf = &local->hw.conf;
553
554 if (local->ps_sdata) {
555 ieee80211_enable_ps(local, local->ps_sdata);
556 } else if (conf->flags & IEEE80211_CONF_PS) {
557 conf->flags &= ~IEEE80211_CONF_PS;
558 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
559 del_timer_sync(&local->dynamic_ps_timer);
560 cancel_work_sync(&local->dynamic_ps_enable_work);
561 }
562 }
563
564 /* need to hold RTNL or interface lock */
565 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
566 {
567 struct ieee80211_sub_if_data *sdata, *found = NULL;
568 int count = 0;
569 int timeout;
570
571 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
572 local->ps_sdata = NULL;
573 return;
574 }
575
576 if (!list_empty(&local->work_list)) {
577 local->ps_sdata = NULL;
578 goto change;
579 }
580
581 list_for_each_entry(sdata, &local->interfaces, list) {
582 if (!ieee80211_sdata_running(sdata))
583 continue;
584 if (sdata->vif.type != NL80211_IFTYPE_STATION)
585 continue;
586 found = sdata;
587 count++;
588 }
589
590 if (count == 1 && found->u.mgd.powersave &&
591 found->u.mgd.associated &&
592 found->u.mgd.associated->beacon_ies &&
593 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
594 IEEE80211_STA_CONNECTION_POLL))) {
595 struct ieee80211_conf *conf = &local->hw.conf;
596 s32 beaconint_us;
597
598 if (latency < 0)
599 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
600
601 beaconint_us = ieee80211_tu_to_usec(
602 found->vif.bss_conf.beacon_int);
603
604 timeout = local->dynamic_ps_forced_timeout;
605 if (timeout < 0) {
606 /*
607 * Go to full PSM if the user configures a very low
608 * latency requirement.
609 * The 2 second value is there for compatibility until
610 * the PM_QOS_NETWORK_LATENCY is configured with real
611 * values.
612 */
613 if (latency > 1900000000 && latency != 2000000000)
614 timeout = 0;
615 else
616 timeout = 100;
617 }
618 local->dynamic_ps_user_timeout = timeout;
619 if (!local->disable_dynamic_ps)
620 conf->dynamic_ps_timeout =
621 local->dynamic_ps_user_timeout;
622
623 if (beaconint_us > latency) {
624 local->ps_sdata = NULL;
625 } else {
626 struct ieee80211_bss *bss;
627 int maxslp = 1;
628 u8 dtimper;
629
630 bss = (void *)found->u.mgd.associated->priv;
631 dtimper = bss->dtim_period;
632
633 /* If the TIM IE is invalid, pretend the value is 1 */
634 if (!dtimper)
635 dtimper = 1;
636 else if (dtimper > 1)
637 maxslp = min_t(int, dtimper,
638 latency / beaconint_us);
639
640 local->hw.conf.max_sleep_period = maxslp;
641 local->hw.conf.ps_dtim_period = dtimper;
642 local->ps_sdata = found;
643 }
644 } else {
645 local->ps_sdata = NULL;
646 }
647
648 change:
649 ieee80211_change_ps(local);
650 }
651
652 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
653 {
654 struct ieee80211_local *local =
655 container_of(work, struct ieee80211_local,
656 dynamic_ps_disable_work);
657
658 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
659 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
660 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
661 }
662
663 ieee80211_wake_queues_by_reason(&local->hw,
664 IEEE80211_QUEUE_STOP_REASON_PS);
665 }
666
667 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
668 {
669 struct ieee80211_local *local =
670 container_of(work, struct ieee80211_local,
671 dynamic_ps_enable_work);
672 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
673 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
674
675 /* can only happen when PS was just disabled anyway */
676 if (!sdata)
677 return;
678
679 if (local->hw.conf.flags & IEEE80211_CONF_PS)
680 return;
681
682 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
683 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
684 ieee80211_send_nullfunc(local, sdata, 1);
685
686 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
687 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
688 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
689 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
690 local->hw.conf.flags |= IEEE80211_CONF_PS;
691 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
692 }
693 }
694
695 void ieee80211_dynamic_ps_timer(unsigned long data)
696 {
697 struct ieee80211_local *local = (void *) data;
698
699 if (local->quiescing || local->suspended)
700 return;
701
702 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
703 }
704
705 /* MLME */
706 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
707 struct ieee80211_sub_if_data *sdata,
708 u8 *wmm_param, size_t wmm_param_len)
709 {
710 struct ieee80211_tx_queue_params params;
711 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
712 size_t left;
713 int count;
714 u8 *pos, uapsd_queues = 0;
715
716 if (!local->ops->conf_tx)
717 return;
718
719 if (local->hw.queues < 4)
720 return;
721
722 if (!wmm_param)
723 return;
724
725 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
726 return;
727
728 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
729 uapsd_queues = local->uapsd_queues;
730
731 count = wmm_param[6] & 0x0f;
732 if (count == ifmgd->wmm_last_param_set)
733 return;
734 ifmgd->wmm_last_param_set = count;
735
736 pos = wmm_param + 8;
737 left = wmm_param_len - 8;
738
739 memset(&params, 0, sizeof(params));
740
741 local->wmm_acm = 0;
742 for (; left >= 4; left -= 4, pos += 4) {
743 int aci = (pos[0] >> 5) & 0x03;
744 int acm = (pos[0] >> 4) & 0x01;
745 bool uapsd = false;
746 int queue;
747
748 switch (aci) {
749 case 1: /* AC_BK */
750 queue = 3;
751 if (acm)
752 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
753 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
754 uapsd = true;
755 break;
756 case 2: /* AC_VI */
757 queue = 1;
758 if (acm)
759 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
760 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
761 uapsd = true;
762 break;
763 case 3: /* AC_VO */
764 queue = 0;
765 if (acm)
766 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
767 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
768 uapsd = true;
769 break;
770 case 0: /* AC_BE */
771 default:
772 queue = 2;
773 if (acm)
774 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
775 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
776 uapsd = true;
777 break;
778 }
779
780 params.aifs = pos[0] & 0x0f;
781 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
782 params.cw_min = ecw2cw(pos[1] & 0x0f);
783 params.txop = get_unaligned_le16(pos + 2);
784 params.uapsd = uapsd;
785
786 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
787 wiphy_debug(local->hw.wiphy,
788 "WMM queue=%d aci=%d acm=%d aifs=%d "
789 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
790 queue, aci, acm,
791 params.aifs, params.cw_min, params.cw_max,
792 params.txop, params.uapsd);
793 #endif
794 if (drv_conf_tx(local, queue, &params))
795 wiphy_debug(local->hw.wiphy,
796 "failed to set TX queue parameters for queue %d\n",
797 queue);
798 }
799
800 /* enable WMM or activate new settings */
801 sdata->vif.bss_conf.qos = true;
802 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
803 }
804
805 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
806 u16 capab, bool erp_valid, u8 erp)
807 {
808 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
809 u32 changed = 0;
810 bool use_protection;
811 bool use_short_preamble;
812 bool use_short_slot;
813
814 if (erp_valid) {
815 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
816 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
817 } else {
818 use_protection = false;
819 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
820 }
821
822 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
823 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
824 use_short_slot = true;
825
826 if (use_protection != bss_conf->use_cts_prot) {
827 bss_conf->use_cts_prot = use_protection;
828 changed |= BSS_CHANGED_ERP_CTS_PROT;
829 }
830
831 if (use_short_preamble != bss_conf->use_short_preamble) {
832 bss_conf->use_short_preamble = use_short_preamble;
833 changed |= BSS_CHANGED_ERP_PREAMBLE;
834 }
835
836 if (use_short_slot != bss_conf->use_short_slot) {
837 bss_conf->use_short_slot = use_short_slot;
838 changed |= BSS_CHANGED_ERP_SLOT;
839 }
840
841 return changed;
842 }
843
844 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
845 struct cfg80211_bss *cbss,
846 u32 bss_info_changed)
847 {
848 struct ieee80211_bss *bss = (void *)cbss->priv;
849 struct ieee80211_local *local = sdata->local;
850 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
851
852 bss_info_changed |= BSS_CHANGED_ASSOC;
853 /* set timing information */
854 bss_conf->beacon_int = cbss->beacon_interval;
855 bss_conf->timestamp = cbss->tsf;
856
857 bss_info_changed |= BSS_CHANGED_BEACON_INT;
858 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
859 cbss->capability, bss->has_erp_value, bss->erp_value);
860
861 sdata->u.mgd.associated = cbss;
862 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
863
864 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
865
866 /* just to be sure */
867 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
868 IEEE80211_STA_BEACON_POLL);
869
870 /*
871 * Always handle WMM once after association regardless
872 * of the first value the AP uses. Setting -1 here has
873 * that effect because the AP values is an unsigned
874 * 4-bit value.
875 */
876 sdata->u.mgd.wmm_last_param_set = -1;
877
878 ieee80211_led_assoc(local, 1);
879
880 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
881 bss_conf->dtim_period = bss->dtim_period;
882 else
883 bss_conf->dtim_period = 0;
884
885 bss_conf->assoc = 1;
886 /*
887 * For now just always ask the driver to update the basic rateset
888 * when we have associated, we aren't checking whether it actually
889 * changed or not.
890 */
891 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
892
893 /* And the BSSID changed - we're associated now */
894 bss_info_changed |= BSS_CHANGED_BSSID;
895
896 /* Tell the driver to monitor connection quality (if supported) */
897 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
898 bss_conf->cqm_rssi_thold)
899 bss_info_changed |= BSS_CHANGED_CQM;
900
901 /* Enable ARP filtering */
902 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
903 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
904 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
905 }
906
907 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
908
909 mutex_lock(&local->iflist_mtx);
910 ieee80211_recalc_ps(local, -1);
911 ieee80211_recalc_smps(local, sdata);
912 mutex_unlock(&local->iflist_mtx);
913
914 netif_tx_start_all_queues(sdata->dev);
915 netif_carrier_on(sdata->dev);
916 }
917
918 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
919 bool remove_sta)
920 {
921 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
922 struct ieee80211_local *local = sdata->local;
923 struct sta_info *sta;
924 u32 changed = 0, config_changed = 0;
925 u8 bssid[ETH_ALEN];
926
927 ASSERT_MGD_MTX(ifmgd);
928
929 if (WARN_ON(!ifmgd->associated))
930 return;
931
932 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
933
934 ifmgd->associated = NULL;
935 memset(ifmgd->bssid, 0, ETH_ALEN);
936
937 /*
938 * we need to commit the associated = NULL change because the
939 * scan code uses that to determine whether this iface should
940 * go to/wake up from powersave or not -- and could otherwise
941 * wake the queues erroneously.
942 */
943 smp_mb();
944
945 /*
946 * Thus, we can only afterwards stop the queues -- to account
947 * for the case where another CPU is finishing a scan at this
948 * time -- we don't want the scan code to enable queues.
949 */
950
951 netif_tx_stop_all_queues(sdata->dev);
952 netif_carrier_off(sdata->dev);
953
954 mutex_lock(&local->sta_mtx);
955 sta = sta_info_get(sdata, bssid);
956 if (sta) {
957 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
958 ieee80211_sta_tear_down_BA_sessions(sta);
959 }
960 mutex_unlock(&local->sta_mtx);
961
962 changed |= ieee80211_reset_erp_info(sdata);
963
964 ieee80211_led_assoc(local, 0);
965 changed |= BSS_CHANGED_ASSOC;
966 sdata->vif.bss_conf.assoc = false;
967
968 ieee80211_set_wmm_default(sdata);
969
970 /* channel(_type) changes are handled by ieee80211_hw_config */
971 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
972
973 /* on the next assoc, re-program HT parameters */
974 sdata->ht_opmode_valid = false;
975
976 local->power_constr_level = 0;
977
978 del_timer_sync(&local->dynamic_ps_timer);
979 cancel_work_sync(&local->dynamic_ps_enable_work);
980
981 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
982 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
983 config_changed |= IEEE80211_CONF_CHANGE_PS;
984 }
985
986 ieee80211_hw_config(local, config_changed);
987
988 /* Disable ARP filtering */
989 if (sdata->vif.bss_conf.arp_filter_enabled) {
990 sdata->vif.bss_conf.arp_filter_enabled = false;
991 changed |= BSS_CHANGED_ARP_FILTER;
992 }
993
994 /* The BSSID (not really interesting) and HT changed */
995 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
996 ieee80211_bss_info_change_notify(sdata, changed);
997
998 if (remove_sta)
999 sta_info_destroy_addr(sdata, bssid);
1000
1001 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1002 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1003 del_timer_sync(&sdata->u.mgd.timer);
1004 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1005 }
1006
1007 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1008 struct ieee80211_hdr *hdr)
1009 {
1010 /*
1011 * We can postpone the mgd.timer whenever receiving unicast frames
1012 * from AP because we know that the connection is working both ways
1013 * at that time. But multicast frames (and hence also beacons) must
1014 * be ignored here, because we need to trigger the timer during
1015 * data idle periods for sending the periodic probe request to the
1016 * AP we're connected to.
1017 */
1018 if (is_multicast_ether_addr(hdr->addr1))
1019 return;
1020
1021 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1022 return;
1023
1024 mod_timer(&sdata->u.mgd.conn_mon_timer,
1025 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1026 }
1027
1028 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1029 {
1030 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1031 const u8 *ssid;
1032
1033 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1034 ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
1035 ssid + 2, ssid[1], NULL, 0);
1036
1037 ifmgd->probe_send_count++;
1038 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1039 run_again(ifmgd, ifmgd->probe_timeout);
1040 }
1041
1042 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1043 bool beacon)
1044 {
1045 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1046 bool already = false;
1047
1048 if (!ieee80211_sdata_running(sdata))
1049 return;
1050
1051 if (sdata->local->scanning)
1052 return;
1053
1054 if (sdata->local->tmp_channel)
1055 return;
1056
1057 mutex_lock(&ifmgd->mtx);
1058
1059 if (!ifmgd->associated)
1060 goto out;
1061
1062 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1063 if (beacon && net_ratelimit())
1064 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1065 "- sending probe request\n", sdata->name);
1066 #endif
1067
1068 /*
1069 * The driver/our work has already reported this event or the
1070 * connection monitoring has kicked in and we have already sent
1071 * a probe request. Or maybe the AP died and the driver keeps
1072 * reporting until we disassociate...
1073 *
1074 * In either case we have to ignore the current call to this
1075 * function (except for setting the correct probe reason bit)
1076 * because otherwise we would reset the timer every time and
1077 * never check whether we received a probe response!
1078 */
1079 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1080 IEEE80211_STA_CONNECTION_POLL))
1081 already = true;
1082
1083 if (beacon)
1084 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1085 else
1086 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1087
1088 if (already)
1089 goto out;
1090
1091 mutex_lock(&sdata->local->iflist_mtx);
1092 ieee80211_recalc_ps(sdata->local, -1);
1093 mutex_unlock(&sdata->local->iflist_mtx);
1094
1095 ifmgd->probe_send_count = 0;
1096 ieee80211_mgd_probe_ap_send(sdata);
1097 out:
1098 mutex_unlock(&ifmgd->mtx);
1099 }
1100
1101 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1102 {
1103 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1104 struct ieee80211_local *local = sdata->local;
1105 u8 bssid[ETH_ALEN];
1106
1107 mutex_lock(&ifmgd->mtx);
1108 if (!ifmgd->associated) {
1109 mutex_unlock(&ifmgd->mtx);
1110 return;
1111 }
1112
1113 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1114
1115 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1116
1117 ieee80211_set_disassoc(sdata, true);
1118 mutex_unlock(&ifmgd->mtx);
1119
1120 mutex_lock(&local->mtx);
1121 ieee80211_recalc_idle(local);
1122 mutex_unlock(&local->mtx);
1123 /*
1124 * must be outside lock due to cfg80211,
1125 * but that's not a problem.
1126 */
1127 ieee80211_send_deauth_disassoc(sdata, bssid,
1128 IEEE80211_STYPE_DEAUTH,
1129 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1130 NULL, true);
1131 }
1132
1133 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1134 {
1135 struct ieee80211_sub_if_data *sdata =
1136 container_of(work, struct ieee80211_sub_if_data,
1137 u.mgd.beacon_connection_loss_work);
1138
1139 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1140 __ieee80211_connection_loss(sdata);
1141 else
1142 ieee80211_mgd_probe_ap(sdata, true);
1143 }
1144
1145 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1146 {
1147 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1148 struct ieee80211_hw *hw = &sdata->local->hw;
1149
1150 trace_api_beacon_loss(sdata);
1151
1152 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1153 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1154 }
1155 EXPORT_SYMBOL(ieee80211_beacon_loss);
1156
1157 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1158 {
1159 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1160 struct ieee80211_hw *hw = &sdata->local->hw;
1161
1162 trace_api_connection_loss(sdata);
1163
1164 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1165 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1166 }
1167 EXPORT_SYMBOL(ieee80211_connection_loss);
1168
1169
1170 static enum rx_mgmt_action __must_check
1171 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1172 struct ieee80211_mgmt *mgmt, size_t len)
1173 {
1174 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1175 const u8 *bssid = NULL;
1176 u16 reason_code;
1177
1178 if (len < 24 + 2)
1179 return RX_MGMT_NONE;
1180
1181 ASSERT_MGD_MTX(ifmgd);
1182
1183 bssid = ifmgd->associated->bssid;
1184
1185 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1186
1187 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1188 sdata->name, bssid, reason_code);
1189
1190 ieee80211_set_disassoc(sdata, true);
1191 mutex_lock(&sdata->local->mtx);
1192 ieee80211_recalc_idle(sdata->local);
1193 mutex_unlock(&sdata->local->mtx);
1194
1195 return RX_MGMT_CFG80211_DEAUTH;
1196 }
1197
1198
1199 static enum rx_mgmt_action __must_check
1200 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1201 struct ieee80211_mgmt *mgmt, size_t len)
1202 {
1203 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1204 u16 reason_code;
1205
1206 if (len < 24 + 2)
1207 return RX_MGMT_NONE;
1208
1209 ASSERT_MGD_MTX(ifmgd);
1210
1211 if (WARN_ON(!ifmgd->associated))
1212 return RX_MGMT_NONE;
1213
1214 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1215 return RX_MGMT_NONE;
1216
1217 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1218
1219 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1220 sdata->name, mgmt->sa, reason_code);
1221
1222 ieee80211_set_disassoc(sdata, true);
1223 mutex_lock(&sdata->local->mtx);
1224 ieee80211_recalc_idle(sdata->local);
1225 mutex_unlock(&sdata->local->mtx);
1226 return RX_MGMT_CFG80211_DISASSOC;
1227 }
1228
1229
1230 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1231 struct ieee80211_mgmt *mgmt, size_t len)
1232 {
1233 struct ieee80211_sub_if_data *sdata = wk->sdata;
1234 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1235 struct ieee80211_local *local = sdata->local;
1236 struct ieee80211_supported_band *sband;
1237 struct sta_info *sta;
1238 struct cfg80211_bss *cbss = wk->assoc.bss;
1239 u8 *pos;
1240 u32 rates, basic_rates;
1241 u16 capab_info, aid;
1242 struct ieee802_11_elems elems;
1243 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1244 u32 changed = 0;
1245 int i, j, err;
1246 bool have_higher_than_11mbit = false;
1247 u16 ap_ht_cap_flags;
1248
1249 /* AssocResp and ReassocResp have identical structure */
1250
1251 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1252 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1253
1254 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1255 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1256 "set\n", sdata->name, aid);
1257 aid &= ~(BIT(15) | BIT(14));
1258
1259 pos = mgmt->u.assoc_resp.variable;
1260 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1261
1262 if (!elems.supp_rates) {
1263 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1264 sdata->name);
1265 return false;
1266 }
1267
1268 ifmgd->aid = aid;
1269
1270 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1271 if (!sta) {
1272 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1273 " the AP\n", sdata->name);
1274 return false;
1275 }
1276
1277 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1278 WLAN_STA_ASSOC_AP);
1279 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1280 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1281
1282 rates = 0;
1283 basic_rates = 0;
1284 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1285
1286 for (i = 0; i < elems.supp_rates_len; i++) {
1287 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1288 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1289
1290 if (rate > 110)
1291 have_higher_than_11mbit = true;
1292
1293 for (j = 0; j < sband->n_bitrates; j++) {
1294 if (sband->bitrates[j].bitrate == rate) {
1295 rates |= BIT(j);
1296 if (is_basic)
1297 basic_rates |= BIT(j);
1298 break;
1299 }
1300 }
1301 }
1302
1303 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1304 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1305 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1306
1307 if (rate > 110)
1308 have_higher_than_11mbit = true;
1309
1310 for (j = 0; j < sband->n_bitrates; j++) {
1311 if (sband->bitrates[j].bitrate == rate) {
1312 rates |= BIT(j);
1313 if (is_basic)
1314 basic_rates |= BIT(j);
1315 break;
1316 }
1317 }
1318 }
1319
1320 sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1321 sdata->vif.bss_conf.basic_rates = basic_rates;
1322
1323 /* cf. IEEE 802.11 9.2.12 */
1324 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1325 have_higher_than_11mbit)
1326 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1327 else
1328 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1329
1330 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1331 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1332 elems.ht_cap_elem, &sta->sta.ht_cap);
1333
1334 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1335
1336 rate_control_rate_init(sta);
1337
1338 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1339 set_sta_flags(sta, WLAN_STA_MFP);
1340
1341 if (elems.wmm_param)
1342 set_sta_flags(sta, WLAN_STA_WME);
1343
1344 err = sta_info_insert(sta);
1345 sta = NULL;
1346 if (err) {
1347 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1348 " the AP (error %d)\n", sdata->name, err);
1349 return false;
1350 }
1351
1352 if (elems.wmm_param)
1353 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1354 elems.wmm_param_len);
1355 else
1356 ieee80211_set_wmm_default(sdata);
1357
1358 local->oper_channel = wk->chan;
1359
1360 if (elems.ht_info_elem && elems.wmm_param &&
1361 (sdata->local->hw.queues >= 4) &&
1362 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1363 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1364 cbss->bssid, ap_ht_cap_flags);
1365
1366 /* set AID and assoc capability,
1367 * ieee80211_set_associated() will tell the driver */
1368 bss_conf->aid = aid;
1369 bss_conf->assoc_capability = capab_info;
1370 ieee80211_set_associated(sdata, cbss, changed);
1371
1372 /*
1373 * If we're using 4-addr mode, let the AP know that we're
1374 * doing so, so that it can create the STA VLAN on its side
1375 */
1376 if (ifmgd->use_4addr)
1377 ieee80211_send_4addr_nullfunc(local, sdata);
1378
1379 /*
1380 * Start timer to probe the connection to the AP now.
1381 * Also start the timer that will detect beacon loss.
1382 */
1383 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1384 mod_beacon_timer(sdata);
1385
1386 return true;
1387 }
1388
1389
1390 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1391 struct ieee80211_mgmt *mgmt,
1392 size_t len,
1393 struct ieee80211_rx_status *rx_status,
1394 struct ieee802_11_elems *elems,
1395 bool beacon)
1396 {
1397 struct ieee80211_local *local = sdata->local;
1398 int freq;
1399 struct ieee80211_bss *bss;
1400 struct ieee80211_channel *channel;
1401 bool need_ps = false;
1402
1403 if (sdata->u.mgd.associated) {
1404 bss = (void *)sdata->u.mgd.associated->priv;
1405 /* not previously set so we may need to recalc */
1406 need_ps = !bss->dtim_period;
1407 }
1408
1409 if (elems->ds_params && elems->ds_params_len == 1)
1410 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1411 else
1412 freq = rx_status->freq;
1413
1414 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1415
1416 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1417 return;
1418
1419 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1420 channel, beacon);
1421 if (bss)
1422 ieee80211_rx_bss_put(local, bss);
1423
1424 if (!sdata->u.mgd.associated)
1425 return;
1426
1427 if (need_ps) {
1428 mutex_lock(&local->iflist_mtx);
1429 ieee80211_recalc_ps(local, -1);
1430 mutex_unlock(&local->iflist_mtx);
1431 }
1432
1433 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1434 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1435 ETH_ALEN) == 0)) {
1436 struct ieee80211_channel_sw_ie *sw_elem =
1437 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1438 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1439 bss, rx_status->mactime);
1440 }
1441 }
1442
1443
1444 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1445 struct sk_buff *skb)
1446 {
1447 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1448 struct ieee80211_if_managed *ifmgd;
1449 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1450 size_t baselen, len = skb->len;
1451 struct ieee802_11_elems elems;
1452
1453 ifmgd = &sdata->u.mgd;
1454
1455 ASSERT_MGD_MTX(ifmgd);
1456
1457 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1458 return; /* ignore ProbeResp to foreign address */
1459
1460 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1461 if (baselen > len)
1462 return;
1463
1464 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1465 &elems);
1466
1467 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1468
1469 if (ifmgd->associated &&
1470 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1471 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1472 IEEE80211_STA_CONNECTION_POLL)) {
1473 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1474 IEEE80211_STA_BEACON_POLL);
1475 mutex_lock(&sdata->local->iflist_mtx);
1476 ieee80211_recalc_ps(sdata->local, -1);
1477 mutex_unlock(&sdata->local->iflist_mtx);
1478
1479 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1480 return;
1481
1482 /*
1483 * We've received a probe response, but are not sure whether
1484 * we have or will be receiving any beacons or data, so let's
1485 * schedule the timers again, just in case.
1486 */
1487 mod_beacon_timer(sdata);
1488
1489 mod_timer(&ifmgd->conn_mon_timer,
1490 round_jiffies_up(jiffies +
1491 IEEE80211_CONNECTION_IDLE_TIME));
1492 }
1493 }
1494
1495 /*
1496 * This is the canonical list of information elements we care about,
1497 * the filter code also gives us all changes to the Microsoft OUI
1498 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1499 *
1500 * We implement beacon filtering in software since that means we can
1501 * avoid processing the frame here and in cfg80211, and userspace
1502 * will not be able to tell whether the hardware supports it or not.
1503 *
1504 * XXX: This list needs to be dynamic -- userspace needs to be able to
1505 * add items it requires. It also needs to be able to tell us to
1506 * look out for other vendor IEs.
1507 */
1508 static const u64 care_about_ies =
1509 (1ULL << WLAN_EID_COUNTRY) |
1510 (1ULL << WLAN_EID_ERP_INFO) |
1511 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1512 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1513 (1ULL << WLAN_EID_HT_CAPABILITY) |
1514 (1ULL << WLAN_EID_HT_INFORMATION);
1515
1516 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1517 struct ieee80211_mgmt *mgmt,
1518 size_t len,
1519 struct ieee80211_rx_status *rx_status)
1520 {
1521 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1522 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1523 size_t baselen;
1524 struct ieee802_11_elems elems;
1525 struct ieee80211_local *local = sdata->local;
1526 u32 changed = 0;
1527 bool erp_valid, directed_tim = false;
1528 u8 erp_value = 0;
1529 u32 ncrc;
1530 u8 *bssid;
1531
1532 ASSERT_MGD_MTX(ifmgd);
1533
1534 /* Process beacon from the current BSS */
1535 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1536 if (baselen > len)
1537 return;
1538
1539 if (rx_status->freq != local->hw.conf.channel->center_freq)
1540 return;
1541
1542 /*
1543 * We might have received a number of frames, among them a
1544 * disassoc frame and a beacon...
1545 */
1546 if (!ifmgd->associated)
1547 return;
1548
1549 bssid = ifmgd->associated->bssid;
1550
1551 /*
1552 * And in theory even frames from a different AP we were just
1553 * associated to a split-second ago!
1554 */
1555 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1556 return;
1557
1558 /* Track average RSSI from the Beacon frames of the current AP */
1559 ifmgd->last_beacon_signal = rx_status->signal;
1560 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1561 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1562 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1563 ifmgd->last_cqm_event_signal = 0;
1564 ifmgd->count_beacon_signal = 1;
1565 } else {
1566 ifmgd->ave_beacon_signal =
1567 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1568 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1569 ifmgd->ave_beacon_signal) / 16;
1570 ifmgd->count_beacon_signal++;
1571 }
1572 if (bss_conf->cqm_rssi_thold &&
1573 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1574 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1575 int sig = ifmgd->ave_beacon_signal / 16;
1576 int last_event = ifmgd->last_cqm_event_signal;
1577 int thold = bss_conf->cqm_rssi_thold;
1578 int hyst = bss_conf->cqm_rssi_hyst;
1579 if (sig < thold &&
1580 (last_event == 0 || sig < last_event - hyst)) {
1581 ifmgd->last_cqm_event_signal = sig;
1582 ieee80211_cqm_rssi_notify(
1583 &sdata->vif,
1584 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1585 GFP_KERNEL);
1586 } else if (sig > thold &&
1587 (last_event == 0 || sig > last_event + hyst)) {
1588 ifmgd->last_cqm_event_signal = sig;
1589 ieee80211_cqm_rssi_notify(
1590 &sdata->vif,
1591 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1592 GFP_KERNEL);
1593 }
1594 }
1595
1596 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1597 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1598 if (net_ratelimit()) {
1599 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1600 "to a received beacon\n", sdata->name);
1601 }
1602 #endif
1603 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1604 mutex_lock(&local->iflist_mtx);
1605 ieee80211_recalc_ps(local, -1);
1606 mutex_unlock(&local->iflist_mtx);
1607 }
1608
1609 /*
1610 * Push the beacon loss detection into the future since
1611 * we are processing a beacon from the AP just now.
1612 */
1613 mod_beacon_timer(sdata);
1614
1615 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1616 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1617 len - baselen, &elems,
1618 care_about_ies, ncrc);
1619
1620 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1621 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1622 ifmgd->aid);
1623
1624 if (ncrc != ifmgd->beacon_crc) {
1625 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1626 true);
1627
1628 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1629 elems.wmm_param_len);
1630 }
1631
1632 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1633 if (directed_tim) {
1634 if (local->hw.conf.dynamic_ps_timeout > 0) {
1635 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1636 ieee80211_hw_config(local,
1637 IEEE80211_CONF_CHANGE_PS);
1638 ieee80211_send_nullfunc(local, sdata, 0);
1639 } else {
1640 local->pspolling = true;
1641
1642 /*
1643 * Here is assumed that the driver will be
1644 * able to send ps-poll frame and receive a
1645 * response even though power save mode is
1646 * enabled, but some drivers might require
1647 * to disable power save here. This needs
1648 * to be investigated.
1649 */
1650 ieee80211_send_pspoll(local, sdata);
1651 }
1652 }
1653 }
1654
1655 if (ncrc == ifmgd->beacon_crc)
1656 return;
1657 ifmgd->beacon_crc = ncrc;
1658
1659 if (elems.erp_info && elems.erp_info_len >= 1) {
1660 erp_valid = true;
1661 erp_value = elems.erp_info[0];
1662 } else {
1663 erp_valid = false;
1664 }
1665 changed |= ieee80211_handle_bss_capability(sdata,
1666 le16_to_cpu(mgmt->u.beacon.capab_info),
1667 erp_valid, erp_value);
1668
1669
1670 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1671 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1672 struct sta_info *sta;
1673 struct ieee80211_supported_band *sband;
1674 u16 ap_ht_cap_flags;
1675
1676 rcu_read_lock();
1677
1678 sta = sta_info_get(sdata, bssid);
1679 if (WARN_ON(!sta)) {
1680 rcu_read_unlock();
1681 return;
1682 }
1683
1684 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1685
1686 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1687 elems.ht_cap_elem, &sta->sta.ht_cap);
1688
1689 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1690
1691 rcu_read_unlock();
1692
1693 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1694 bssid, ap_ht_cap_flags);
1695 }
1696
1697 /* Note: country IE parsing is done for us by cfg80211 */
1698 if (elems.country_elem) {
1699 /* TODO: IBSS also needs this */
1700 if (elems.pwr_constr_elem)
1701 ieee80211_handle_pwr_constr(sdata,
1702 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1703 elems.pwr_constr_elem,
1704 elems.pwr_constr_elem_len);
1705 }
1706
1707 ieee80211_bss_info_change_notify(sdata, changed);
1708 }
1709
1710 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1711 struct sk_buff *skb)
1712 {
1713 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1714 struct ieee80211_rx_status *rx_status;
1715 struct ieee80211_mgmt *mgmt;
1716 enum rx_mgmt_action rma = RX_MGMT_NONE;
1717 u16 fc;
1718
1719 rx_status = (struct ieee80211_rx_status *) skb->cb;
1720 mgmt = (struct ieee80211_mgmt *) skb->data;
1721 fc = le16_to_cpu(mgmt->frame_control);
1722
1723 mutex_lock(&ifmgd->mtx);
1724
1725 if (ifmgd->associated &&
1726 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1727 switch (fc & IEEE80211_FCTL_STYPE) {
1728 case IEEE80211_STYPE_BEACON:
1729 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1730 rx_status);
1731 break;
1732 case IEEE80211_STYPE_PROBE_RESP:
1733 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1734 break;
1735 case IEEE80211_STYPE_DEAUTH:
1736 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1737 break;
1738 case IEEE80211_STYPE_DISASSOC:
1739 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1740 break;
1741 case IEEE80211_STYPE_ACTION:
1742 switch (mgmt->u.action.category) {
1743 case WLAN_CATEGORY_SPECTRUM_MGMT:
1744 ieee80211_sta_process_chanswitch(sdata,
1745 &mgmt->u.action.u.chan_switch.sw_elem,
1746 (void *)ifmgd->associated->priv,
1747 rx_status->mactime);
1748 break;
1749 }
1750 }
1751 mutex_unlock(&ifmgd->mtx);
1752
1753 switch (rma) {
1754 case RX_MGMT_NONE:
1755 /* no action */
1756 break;
1757 case RX_MGMT_CFG80211_DEAUTH:
1758 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1759 break;
1760 case RX_MGMT_CFG80211_DISASSOC:
1761 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1762 break;
1763 default:
1764 WARN(1, "unexpected: %d", rma);
1765 }
1766 return;
1767 }
1768
1769 mutex_unlock(&ifmgd->mtx);
1770
1771 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1772 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1773 struct ieee80211_local *local = sdata->local;
1774 struct ieee80211_work *wk;
1775
1776 mutex_lock(&local->mtx);
1777 list_for_each_entry(wk, &local->work_list, list) {
1778 if (wk->sdata != sdata)
1779 continue;
1780
1781 if (wk->type != IEEE80211_WORK_ASSOC &&
1782 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1783 continue;
1784
1785 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1786 continue;
1787 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1788 continue;
1789
1790 /*
1791 * Printing the message only here means we can't
1792 * spuriously print it, but it also means that it
1793 * won't be printed when the frame comes in before
1794 * we even tried to associate or in similar cases.
1795 *
1796 * Ultimately, I suspect cfg80211 should print the
1797 * messages instead.
1798 */
1799 printk(KERN_DEBUG
1800 "%s: deauthenticated from %pM (Reason: %u)\n",
1801 sdata->name, mgmt->bssid,
1802 le16_to_cpu(mgmt->u.deauth.reason_code));
1803
1804 list_del_rcu(&wk->list);
1805 free_work(wk);
1806 break;
1807 }
1808 mutex_unlock(&local->mtx);
1809
1810 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1811 }
1812 }
1813
1814 static void ieee80211_sta_timer(unsigned long data)
1815 {
1816 struct ieee80211_sub_if_data *sdata =
1817 (struct ieee80211_sub_if_data *) data;
1818 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1819 struct ieee80211_local *local = sdata->local;
1820
1821 if (local->quiescing) {
1822 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1823 return;
1824 }
1825
1826 ieee80211_queue_work(&local->hw, &sdata->work);
1827 }
1828
1829 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1830 {
1831 struct ieee80211_local *local = sdata->local;
1832 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1833
1834 /* then process the rest of the work */
1835 mutex_lock(&ifmgd->mtx);
1836
1837 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1838 IEEE80211_STA_CONNECTION_POLL) &&
1839 ifmgd->associated) {
1840 u8 bssid[ETH_ALEN];
1841
1842 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1843 if (time_is_after_jiffies(ifmgd->probe_timeout))
1844 run_again(ifmgd, ifmgd->probe_timeout);
1845
1846 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1847 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1848 printk(KERN_DEBUG "No probe response from AP %pM"
1849 " after %dms, try %d\n", bssid,
1850 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1851 ifmgd->probe_send_count);
1852 #endif
1853 ieee80211_mgd_probe_ap_send(sdata);
1854 } else {
1855 /*
1856 * We actually lost the connection ... or did we?
1857 * Let's make sure!
1858 */
1859 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1860 IEEE80211_STA_BEACON_POLL);
1861 printk(KERN_DEBUG "No probe response from AP %pM"
1862 " after %dms, disconnecting.\n",
1863 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1864 ieee80211_set_disassoc(sdata, true);
1865 mutex_unlock(&ifmgd->mtx);
1866 mutex_lock(&local->mtx);
1867 ieee80211_recalc_idle(local);
1868 mutex_unlock(&local->mtx);
1869 /*
1870 * must be outside lock due to cfg80211,
1871 * but that's not a problem.
1872 */
1873 ieee80211_send_deauth_disassoc(sdata, bssid,
1874 IEEE80211_STYPE_DEAUTH,
1875 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1876 NULL, true);
1877 mutex_lock(&ifmgd->mtx);
1878 }
1879 }
1880
1881 mutex_unlock(&ifmgd->mtx);
1882 }
1883
1884 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1885 {
1886 struct ieee80211_sub_if_data *sdata =
1887 (struct ieee80211_sub_if_data *) data;
1888 struct ieee80211_local *local = sdata->local;
1889
1890 if (local->quiescing)
1891 return;
1892
1893 ieee80211_queue_work(&sdata->local->hw,
1894 &sdata->u.mgd.beacon_connection_loss_work);
1895 }
1896
1897 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1898 {
1899 struct ieee80211_sub_if_data *sdata =
1900 (struct ieee80211_sub_if_data *) data;
1901 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1902 struct ieee80211_local *local = sdata->local;
1903
1904 if (local->quiescing)
1905 return;
1906
1907 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1908 }
1909
1910 static void ieee80211_sta_monitor_work(struct work_struct *work)
1911 {
1912 struct ieee80211_sub_if_data *sdata =
1913 container_of(work, struct ieee80211_sub_if_data,
1914 u.mgd.monitor_work);
1915
1916 ieee80211_mgd_probe_ap(sdata, false);
1917 }
1918
1919 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1920 {
1921 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1922 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1923 IEEE80211_STA_CONNECTION_POLL);
1924
1925 /* let's probe the connection once */
1926 ieee80211_queue_work(&sdata->local->hw,
1927 &sdata->u.mgd.monitor_work);
1928 /* and do all the other regular work too */
1929 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1930 }
1931 }
1932
1933 #ifdef CONFIG_PM
1934 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1935 {
1936 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1937
1938 /*
1939 * we need to use atomic bitops for the running bits
1940 * only because both timers might fire at the same
1941 * time -- the code here is properly synchronised.
1942 */
1943
1944 cancel_work_sync(&ifmgd->request_smps_work);
1945
1946 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1947 if (del_timer_sync(&ifmgd->timer))
1948 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1949
1950 cancel_work_sync(&ifmgd->chswitch_work);
1951 if (del_timer_sync(&ifmgd->chswitch_timer))
1952 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1953
1954 cancel_work_sync(&ifmgd->monitor_work);
1955 /* these will just be re-established on connection */
1956 del_timer_sync(&ifmgd->conn_mon_timer);
1957 del_timer_sync(&ifmgd->bcn_mon_timer);
1958 }
1959
1960 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1961 {
1962 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1963
1964 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1965 add_timer(&ifmgd->timer);
1966 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1967 add_timer(&ifmgd->chswitch_timer);
1968 }
1969 #endif
1970
1971 /* interface setup */
1972 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1973 {
1974 struct ieee80211_if_managed *ifmgd;
1975
1976 ifmgd = &sdata->u.mgd;
1977 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1978 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1979 INIT_WORK(&ifmgd->beacon_connection_loss_work,
1980 ieee80211_beacon_connection_loss_work);
1981 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
1982 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1983 (unsigned long) sdata);
1984 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1985 (unsigned long) sdata);
1986 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1987 (unsigned long) sdata);
1988 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1989 (unsigned long) sdata);
1990
1991 ifmgd->flags = 0;
1992
1993 mutex_init(&ifmgd->mtx);
1994
1995 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1996 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1997 else
1998 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1999 }
2000
2001 /* scan finished notification */
2002 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2003 {
2004 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2005
2006 /* Restart STA timers */
2007 rcu_read_lock();
2008 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2009 ieee80211_restart_sta_timer(sdata);
2010 rcu_read_unlock();
2011 }
2012
2013 int ieee80211_max_network_latency(struct notifier_block *nb,
2014 unsigned long data, void *dummy)
2015 {
2016 s32 latency_usec = (s32) data;
2017 struct ieee80211_local *local =
2018 container_of(nb, struct ieee80211_local,
2019 network_latency_notifier);
2020
2021 mutex_lock(&local->iflist_mtx);
2022 ieee80211_recalc_ps(local, latency_usec);
2023 mutex_unlock(&local->iflist_mtx);
2024
2025 return 0;
2026 }
2027
2028 /* config hooks */
2029 static enum work_done_result
2030 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2031 struct sk_buff *skb)
2032 {
2033 if (!skb) {
2034 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2035 return WORK_DONE_DESTROY;
2036 }
2037
2038 if (wk->type == IEEE80211_WORK_AUTH) {
2039 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2040 return WORK_DONE_DESTROY;
2041 }
2042
2043 mutex_lock(&wk->sdata->u.mgd.mtx);
2044 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2045 mutex_unlock(&wk->sdata->u.mgd.mtx);
2046
2047 wk->type = IEEE80211_WORK_AUTH;
2048 wk->probe_auth.tries = 0;
2049 return WORK_DONE_REQUEUE;
2050 }
2051
2052 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2053 struct cfg80211_auth_request *req)
2054 {
2055 const u8 *ssid;
2056 struct ieee80211_work *wk;
2057 u16 auth_alg;
2058
2059 if (req->local_state_change)
2060 return 0; /* no need to update mac80211 state */
2061
2062 switch (req->auth_type) {
2063 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2064 auth_alg = WLAN_AUTH_OPEN;
2065 break;
2066 case NL80211_AUTHTYPE_SHARED_KEY:
2067 if (IS_ERR(sdata->local->wep_tx_tfm))
2068 return -EOPNOTSUPP;
2069 auth_alg = WLAN_AUTH_SHARED_KEY;
2070 break;
2071 case NL80211_AUTHTYPE_FT:
2072 auth_alg = WLAN_AUTH_FT;
2073 break;
2074 case NL80211_AUTHTYPE_NETWORK_EAP:
2075 auth_alg = WLAN_AUTH_LEAP;
2076 break;
2077 default:
2078 return -EOPNOTSUPP;
2079 }
2080
2081 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2082 if (!wk)
2083 return -ENOMEM;
2084
2085 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2086
2087 if (req->ie && req->ie_len) {
2088 memcpy(wk->ie, req->ie, req->ie_len);
2089 wk->ie_len = req->ie_len;
2090 }
2091
2092 if (req->key && req->key_len) {
2093 wk->probe_auth.key_len = req->key_len;
2094 wk->probe_auth.key_idx = req->key_idx;
2095 memcpy(wk->probe_auth.key, req->key, req->key_len);
2096 }
2097
2098 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2099 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2100 wk->probe_auth.ssid_len = ssid[1];
2101
2102 wk->probe_auth.algorithm = auth_alg;
2103 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2104
2105 /* if we already have a probe, don't probe again */
2106 if (req->bss->proberesp_ies)
2107 wk->type = IEEE80211_WORK_AUTH;
2108 else
2109 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2110 wk->chan = req->bss->channel;
2111 wk->sdata = sdata;
2112 wk->done = ieee80211_probe_auth_done;
2113
2114 ieee80211_add_work(wk);
2115 return 0;
2116 }
2117
2118 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2119 struct sk_buff *skb)
2120 {
2121 struct ieee80211_mgmt *mgmt;
2122 struct ieee80211_rx_status *rx_status;
2123 struct ieee802_11_elems elems;
2124 u16 status;
2125
2126 if (!skb) {
2127 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2128 return WORK_DONE_DESTROY;
2129 }
2130
2131 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2132 mutex_lock(&wk->sdata->u.mgd.mtx);
2133 rx_status = (void *) skb->cb;
2134 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2135 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2136 &elems, true);
2137 mutex_unlock(&wk->sdata->u.mgd.mtx);
2138
2139 wk->type = IEEE80211_WORK_ASSOC;
2140 /* not really done yet */
2141 return WORK_DONE_REQUEUE;
2142 }
2143
2144 mgmt = (void *)skb->data;
2145 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2146
2147 if (status == WLAN_STATUS_SUCCESS) {
2148 mutex_lock(&wk->sdata->u.mgd.mtx);
2149 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2150 mutex_unlock(&wk->sdata->u.mgd.mtx);
2151 /* oops -- internal error -- send timeout for now */
2152 cfg80211_send_assoc_timeout(wk->sdata->dev,
2153 wk->filter_ta);
2154 return WORK_DONE_DESTROY;
2155 }
2156
2157 mutex_unlock(&wk->sdata->u.mgd.mtx);
2158 }
2159
2160 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2161 return WORK_DONE_DESTROY;
2162 }
2163
2164 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2165 struct cfg80211_assoc_request *req)
2166 {
2167 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2168 struct ieee80211_bss *bss = (void *)req->bss->priv;
2169 struct ieee80211_work *wk;
2170 const u8 *ssid;
2171 int i;
2172
2173 mutex_lock(&ifmgd->mtx);
2174 if (ifmgd->associated) {
2175 if (!req->prev_bssid ||
2176 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2177 ETH_ALEN)) {
2178 /*
2179 * We are already associated and the request was not a
2180 * reassociation request from the current BSS, so
2181 * reject it.
2182 */
2183 mutex_unlock(&ifmgd->mtx);
2184 return -EALREADY;
2185 }
2186
2187 /* Trying to reassociate - clear previous association state */
2188 ieee80211_set_disassoc(sdata, true);
2189 }
2190 mutex_unlock(&ifmgd->mtx);
2191
2192 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2193 if (!wk)
2194 return -ENOMEM;
2195
2196 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2197 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2198
2199 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2200 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2201 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2202 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2203 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2204
2205
2206 if (req->ie && req->ie_len) {
2207 memcpy(wk->ie, req->ie, req->ie_len);
2208 wk->ie_len = req->ie_len;
2209 } else
2210 wk->ie_len = 0;
2211
2212 wk->assoc.bss = req->bss;
2213
2214 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2215
2216 /* new association always uses requested smps mode */
2217 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2218 if (ifmgd->powersave)
2219 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2220 else
2221 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2222 } else
2223 ifmgd->ap_smps = ifmgd->req_smps;
2224
2225 wk->assoc.smps = ifmgd->ap_smps;
2226 /*
2227 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2228 * We still associate in non-HT mode (11a/b/g) if any one of these
2229 * ciphers is configured as pairwise.
2230 * We can set this to true for non-11n hardware, that'll be checked
2231 * separately along with the peer capabilities.
2232 */
2233 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2234 wk->assoc.capability = req->bss->capability;
2235 wk->assoc.wmm_used = bss->wmm_used;
2236 wk->assoc.supp_rates = bss->supp_rates;
2237 wk->assoc.supp_rates_len = bss->supp_rates_len;
2238 wk->assoc.ht_information_ie =
2239 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2240
2241 if (bss->wmm_used && bss->uapsd_supported &&
2242 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2243 wk->assoc.uapsd_used = true;
2244 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2245 } else {
2246 wk->assoc.uapsd_used = false;
2247 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2248 }
2249
2250 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2251 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2252 wk->assoc.ssid_len = ssid[1];
2253
2254 if (req->prev_bssid)
2255 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2256
2257 wk->chan = req->bss->channel;
2258 wk->sdata = sdata;
2259 wk->done = ieee80211_assoc_done;
2260 if (!bss->dtim_period &&
2261 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2262 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2263 else
2264 wk->type = IEEE80211_WORK_ASSOC;
2265
2266 if (req->use_mfp) {
2267 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2268 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2269 } else {
2270 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2271 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2272 }
2273
2274 if (req->crypto.control_port)
2275 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2276 else
2277 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2278
2279 sdata->control_port_protocol = req->crypto.control_port_ethertype;
2280 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2281
2282 ieee80211_add_work(wk);
2283 return 0;
2284 }
2285
2286 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2287 struct cfg80211_deauth_request *req,
2288 void *cookie)
2289 {
2290 struct ieee80211_local *local = sdata->local;
2291 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2292 struct ieee80211_work *wk;
2293 u8 bssid[ETH_ALEN];
2294 bool assoc_bss = false;
2295
2296 mutex_lock(&ifmgd->mtx);
2297
2298 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2299 if (ifmgd->associated == req->bss) {
2300 ieee80211_set_disassoc(sdata, false);
2301 mutex_unlock(&ifmgd->mtx);
2302 assoc_bss = true;
2303 } else {
2304 bool not_auth_yet = false;
2305
2306 mutex_unlock(&ifmgd->mtx);
2307
2308 mutex_lock(&local->mtx);
2309 list_for_each_entry(wk, &local->work_list, list) {
2310 if (wk->sdata != sdata)
2311 continue;
2312
2313 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2314 wk->type != IEEE80211_WORK_AUTH &&
2315 wk->type != IEEE80211_WORK_ASSOC &&
2316 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2317 continue;
2318
2319 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2320 continue;
2321
2322 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2323 list_del_rcu(&wk->list);
2324 free_work(wk);
2325 break;
2326 }
2327 mutex_unlock(&local->mtx);
2328
2329 /*
2330 * If somebody requests authentication and we haven't
2331 * sent out an auth frame yet there's no need to send
2332 * out a deauth frame either. If the state was PROBE,
2333 * then this is the case. If it's AUTH we have sent a
2334 * frame, and if it's IDLE we have completed the auth
2335 * process already.
2336 */
2337 if (not_auth_yet) {
2338 __cfg80211_auth_canceled(sdata->dev, bssid);
2339 return 0;
2340 }
2341 }
2342
2343 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2344 sdata->name, bssid, req->reason_code);
2345
2346 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2347 req->reason_code, cookie,
2348 !req->local_state_change);
2349 if (assoc_bss)
2350 sta_info_destroy_addr(sdata, bssid);
2351
2352 mutex_lock(&sdata->local->mtx);
2353 ieee80211_recalc_idle(sdata->local);
2354 mutex_unlock(&sdata->local->mtx);
2355
2356 return 0;
2357 }
2358
2359 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2360 struct cfg80211_disassoc_request *req,
2361 void *cookie)
2362 {
2363 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2364 u8 bssid[ETH_ALEN];
2365
2366 mutex_lock(&ifmgd->mtx);
2367
2368 /*
2369 * cfg80211 should catch this ... but it's racy since
2370 * we can receive a disassoc frame, process it, hand it
2371 * to cfg80211 while that's in a locked section already
2372 * trying to tell us that the user wants to disconnect.
2373 */
2374 if (ifmgd->associated != req->bss) {
2375 mutex_unlock(&ifmgd->mtx);
2376 return -ENOLINK;
2377 }
2378
2379 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2380 sdata->name, req->bss->bssid, req->reason_code);
2381
2382 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2383 ieee80211_set_disassoc(sdata, false);
2384
2385 mutex_unlock(&ifmgd->mtx);
2386
2387 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2388 IEEE80211_STYPE_DISASSOC, req->reason_code,
2389 cookie, !req->local_state_change);
2390 sta_info_destroy_addr(sdata, bssid);
2391
2392 mutex_lock(&sdata->local->mtx);
2393 ieee80211_recalc_idle(sdata->local);
2394 mutex_unlock(&sdata->local->mtx);
2395
2396 return 0;
2397 }
2398
2399 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2400 enum nl80211_cqm_rssi_threshold_event rssi_event,
2401 gfp_t gfp)
2402 {
2403 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2404
2405 trace_api_cqm_rssi_notify(sdata, rssi_event);
2406
2407 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2408 }
2409 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
CJK support for tty framebuffer vt