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x86, mrst: Check platform_device_register() return code
[linux-2.6/next.git] / net / mac80211 / mlme.c
bloba3a9421555af30201e13d8ea24c36f4bb759680f
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 lockdep_assert_held(&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 void ieee80211_sta_reset_beacon_monitor(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 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
128 {
129 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
130
131 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
132 return;
133
134 mod_timer(&sdata->u.mgd.conn_mon_timer,
135 round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
136
137 ifmgd->probe_send_count = 0;
138 }
139
140 static int ecw2cw(int ecw)
141 {
142 return (1 << ecw) - 1;
143 }
144
145 /*
146 * ieee80211_enable_ht should be called only after the operating band
147 * has been determined as ht configuration depends on the hw's
148 * HT abilities for a specific band.
149 */
150 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
151 struct ieee80211_ht_info *hti,
152 const u8 *bssid, u16 ap_ht_cap_flags)
153 {
154 struct ieee80211_local *local = sdata->local;
155 struct ieee80211_supported_band *sband;
156 struct sta_info *sta;
157 u32 changed = 0;
158 u16 ht_opmode;
159 bool enable_ht = true;
160 enum nl80211_channel_type prev_chantype;
161 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
162
163 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
164
165 prev_chantype = sdata->vif.bss_conf.channel_type;
166
167 /* HT is not supported */
168 if (!sband->ht_cap.ht_supported)
169 enable_ht = false;
170
171 /* check that channel matches the right operating channel */
172 if (local->hw.conf.channel->center_freq !=
173 ieee80211_channel_to_frequency(hti->control_chan))
174 enable_ht = false;
175
176 if (enable_ht) {
177 channel_type = NL80211_CHAN_HT20;
178
179 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
180 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
181 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
182 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
183 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
184 if (!(local->hw.conf.channel->flags &
185 IEEE80211_CHAN_NO_HT40PLUS))
186 channel_type = NL80211_CHAN_HT40PLUS;
187 break;
188 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
189 if (!(local->hw.conf.channel->flags &
190 IEEE80211_CHAN_NO_HT40MINUS))
191 channel_type = NL80211_CHAN_HT40MINUS;
192 break;
193 }
194 }
195 }
196
197 if (local->tmp_channel)
198 local->tmp_channel_type = channel_type;
199
200 if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
201 /* can only fail due to HT40+/- mismatch */
202 channel_type = NL80211_CHAN_HT20;
203 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
204 }
205
206 /* channel_type change automatically detected */
207 ieee80211_hw_config(local, 0);
208
209 if (prev_chantype != channel_type) {
210 rcu_read_lock();
211 sta = sta_info_get(sdata, bssid);
212 if (sta)
213 rate_control_rate_update(local, sband, sta,
214 IEEE80211_RC_HT_CHANGED,
215 channel_type);
216 rcu_read_unlock();
217 }
218
219 ht_opmode = le16_to_cpu(hti->operation_mode);
220
221 /* if bss configuration changed store the new one */
222 if (sdata->ht_opmode_valid != enable_ht ||
223 sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
224 prev_chantype != channel_type) {
225 changed |= BSS_CHANGED_HT;
226 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
227 sdata->ht_opmode_valid = enable_ht;
228 }
229
230 return changed;
231 }
232
233 /* frame sending functions */
234
235 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
236 const u8 *bssid, u16 stype, u16 reason,
237 void *cookie, bool send_frame)
238 {
239 struct ieee80211_local *local = sdata->local;
240 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
241 struct sk_buff *skb;
242 struct ieee80211_mgmt *mgmt;
243
244 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
245 if (!skb) {
246 printk(KERN_DEBUG "%s: failed to allocate buffer for "
247 "deauth/disassoc frame\n", sdata->name);
248 return;
249 }
250 skb_reserve(skb, local->hw.extra_tx_headroom);
251
252 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
253 memset(mgmt, 0, 24);
254 memcpy(mgmt->da, bssid, ETH_ALEN);
255 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
256 memcpy(mgmt->bssid, bssid, ETH_ALEN);
257 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
258 skb_put(skb, 2);
259 /* u.deauth.reason_code == u.disassoc.reason_code */
260 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
261
262 if (stype == IEEE80211_STYPE_DEAUTH)
263 if (cookie)
264 __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
265 else
266 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
267 else
268 if (cookie)
269 __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
270 else
271 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
272 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
273 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
274
275 if (send_frame)
276 ieee80211_tx_skb(sdata, skb);
277 else
278 kfree_skb(skb);
279 }
280
281 void ieee80211_send_pspoll(struct ieee80211_local *local,
282 struct ieee80211_sub_if_data *sdata)
283 {
284 struct ieee80211_pspoll *pspoll;
285 struct sk_buff *skb;
286
287 skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
288 if (!skb)
289 return;
290
291 pspoll = (struct ieee80211_pspoll *) skb->data;
292 pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
293
294 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
295 ieee80211_tx_skb(sdata, skb);
296 }
297
298 void ieee80211_send_nullfunc(struct ieee80211_local *local,
299 struct ieee80211_sub_if_data *sdata,
300 int powersave)
301 {
302 struct sk_buff *skb;
303 struct ieee80211_hdr_3addr *nullfunc;
304
305 skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
306 if (!skb)
307 return;
308
309 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
310 if (powersave)
311 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
312
313 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
314 ieee80211_tx_skb(sdata, skb);
315 }
316
317 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
318 struct ieee80211_sub_if_data *sdata)
319 {
320 struct sk_buff *skb;
321 struct ieee80211_hdr *nullfunc;
322 __le16 fc;
323
324 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
325 return;
326
327 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
328 if (!skb) {
329 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
330 "nullfunc frame\n", sdata->name);
331 return;
332 }
333 skb_reserve(skb, local->hw.extra_tx_headroom);
334
335 nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
336 memset(nullfunc, 0, 30);
337 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
338 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
339 nullfunc->frame_control = fc;
340 memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
341 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
342 memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
343 memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
344
345 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
346 ieee80211_tx_skb(sdata, skb);
347 }
348
349 /* spectrum management related things */
350 static void ieee80211_chswitch_work(struct work_struct *work)
351 {
352 struct ieee80211_sub_if_data *sdata =
353 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
354 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
355
356 if (!ieee80211_sdata_running(sdata))
357 return;
358
359 mutex_lock(&ifmgd->mtx);
360 if (!ifmgd->associated)
361 goto out;
362
363 sdata->local->oper_channel = sdata->local->csa_channel;
364 if (!sdata->local->ops->channel_switch) {
365 /* call "hw_config" only if doing sw channel switch */
366 ieee80211_hw_config(sdata->local,
367 IEEE80211_CONF_CHANGE_CHANNEL);
368 }
369
370 /* XXX: shouldn't really modify cfg80211-owned data! */
371 ifmgd->associated->channel = sdata->local->oper_channel;
372
373 ieee80211_wake_queues_by_reason(&sdata->local->hw,
374 IEEE80211_QUEUE_STOP_REASON_CSA);
375 out:
376 ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
377 mutex_unlock(&ifmgd->mtx);
378 }
379
380 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
381 {
382 struct ieee80211_sub_if_data *sdata;
383 struct ieee80211_if_managed *ifmgd;
384
385 sdata = vif_to_sdata(vif);
386 ifmgd = &sdata->u.mgd;
387
388 trace_api_chswitch_done(sdata, success);
389 if (!success) {
390 /*
391 * If the channel switch was not successful, stay
392 * around on the old channel. We currently lack
393 * good handling of this situation, possibly we
394 * should just drop the association.
395 */
396 sdata->local->csa_channel = sdata->local->oper_channel;
397 }
398
399 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
400 }
401 EXPORT_SYMBOL(ieee80211_chswitch_done);
402
403 static void ieee80211_chswitch_timer(unsigned long data)
404 {
405 struct ieee80211_sub_if_data *sdata =
406 (struct ieee80211_sub_if_data *) data;
407 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
408
409 if (sdata->local->quiescing) {
410 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
411 return;
412 }
413
414 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
415 }
416
417 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
418 struct ieee80211_channel_sw_ie *sw_elem,
419 struct ieee80211_bss *bss,
420 u64 timestamp)
421 {
422 struct cfg80211_bss *cbss =
423 container_of((void *)bss, struct cfg80211_bss, priv);
424 struct ieee80211_channel *new_ch;
425 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
426 int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
427
428 ASSERT_MGD_MTX(ifmgd);
429
430 if (!ifmgd->associated)
431 return;
432
433 if (sdata->local->scanning)
434 return;
435
436 /* Disregard subsequent beacons if we are already running a timer
437 processing a CSA */
438
439 if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
440 return;
441
442 new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
443 if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
444 return;
445
446 sdata->local->csa_channel = new_ch;
447
448 if (sdata->local->ops->channel_switch) {
449 /* use driver's channel switch callback */
450 struct ieee80211_channel_switch ch_switch;
451 memset(&ch_switch, 0, sizeof(ch_switch));
452 ch_switch.timestamp = timestamp;
453 if (sw_elem->mode) {
454 ch_switch.block_tx = true;
455 ieee80211_stop_queues_by_reason(&sdata->local->hw,
456 IEEE80211_QUEUE_STOP_REASON_CSA);
457 }
458 ch_switch.channel = new_ch;
459 ch_switch.count = sw_elem->count;
460 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
461 drv_channel_switch(sdata->local, &ch_switch);
462 return;
463 }
464
465 /* channel switch handled in software */
466 if (sw_elem->count <= 1) {
467 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
468 } else {
469 if (sw_elem->mode)
470 ieee80211_stop_queues_by_reason(&sdata->local->hw,
471 IEEE80211_QUEUE_STOP_REASON_CSA);
472 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
473 mod_timer(&ifmgd->chswitch_timer,
474 jiffies +
475 msecs_to_jiffies(sw_elem->count *
476 cbss->beacon_interval));
477 }
478 }
479
480 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
481 u16 capab_info, u8 *pwr_constr_elem,
482 u8 pwr_constr_elem_len)
483 {
484 struct ieee80211_conf *conf = &sdata->local->hw.conf;
485
486 if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
487 return;
488
489 /* Power constraint IE length should be 1 octet */
490 if (pwr_constr_elem_len != 1)
491 return;
492
493 if ((*pwr_constr_elem <= conf->channel->max_power) &&
494 (*pwr_constr_elem != sdata->local->power_constr_level)) {
495 sdata->local->power_constr_level = *pwr_constr_elem;
496 ieee80211_hw_config(sdata->local, 0);
497 }
498 }
499
500 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
501 {
502 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
503 struct ieee80211_local *local = sdata->local;
504 struct ieee80211_conf *conf = &local->hw.conf;
505
506 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
507 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
508 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
509
510 local->disable_dynamic_ps = false;
511 conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
512 }
513 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
514
515 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
516 {
517 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
518 struct ieee80211_local *local = sdata->local;
519 struct ieee80211_conf *conf = &local->hw.conf;
520
521 WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
522 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
523 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
524
525 local->disable_dynamic_ps = true;
526 conf->dynamic_ps_timeout = 0;
527 del_timer_sync(&local->dynamic_ps_timer);
528 ieee80211_queue_work(&local->hw,
529 &local->dynamic_ps_enable_work);
530 }
531 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
532
533 /* powersave */
534 static void ieee80211_enable_ps(struct ieee80211_local *local,
535 struct ieee80211_sub_if_data *sdata)
536 {
537 struct ieee80211_conf *conf = &local->hw.conf;
538
539 /*
540 * If we are scanning right now then the parameters will
541 * take effect when scan finishes.
542 */
543 if (local->scanning)
544 return;
545
546 if (conf->dynamic_ps_timeout > 0 &&
547 !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
548 mod_timer(&local->dynamic_ps_timer, jiffies +
549 msecs_to_jiffies(conf->dynamic_ps_timeout));
550 } else {
551 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
552 ieee80211_send_nullfunc(local, sdata, 1);
553
554 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
555 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
556 return;
557
558 conf->flags |= IEEE80211_CONF_PS;
559 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
560 }
561 }
562
563 static void ieee80211_change_ps(struct ieee80211_local *local)
564 {
565 struct ieee80211_conf *conf = &local->hw.conf;
566
567 if (local->ps_sdata) {
568 ieee80211_enable_ps(local, local->ps_sdata);
569 } else if (conf->flags & IEEE80211_CONF_PS) {
570 conf->flags &= ~IEEE80211_CONF_PS;
571 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
572 del_timer_sync(&local->dynamic_ps_timer);
573 cancel_work_sync(&local->dynamic_ps_enable_work);
574 }
575 }
576
577 /* need to hold RTNL or interface lock */
578 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
579 {
580 struct ieee80211_sub_if_data *sdata, *found = NULL;
581 int count = 0;
582 int timeout;
583
584 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
585 local->ps_sdata = NULL;
586 return;
587 }
588
589 if (!list_empty(&local->work_list)) {
590 local->ps_sdata = NULL;
591 goto change;
592 }
593
594 list_for_each_entry(sdata, &local->interfaces, list) {
595 if (!ieee80211_sdata_running(sdata))
596 continue;
597 if (sdata->vif.type != NL80211_IFTYPE_STATION)
598 continue;
599 found = sdata;
600 count++;
601 }
602
603 if (count == 1 && found->u.mgd.powersave &&
604 found->u.mgd.associated &&
605 found->u.mgd.associated->beacon_ies &&
606 !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
607 IEEE80211_STA_CONNECTION_POLL))) {
608 struct ieee80211_conf *conf = &local->hw.conf;
609 s32 beaconint_us;
610
611 if (latency < 0)
612 latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
613
614 beaconint_us = ieee80211_tu_to_usec(
615 found->vif.bss_conf.beacon_int);
616
617 timeout = local->dynamic_ps_forced_timeout;
618 if (timeout < 0) {
619 /*
620 * Go to full PSM if the user configures a very low
621 * latency requirement.
622 * The 2 second value is there for compatibility until
623 * the PM_QOS_NETWORK_LATENCY is configured with real
624 * values.
625 */
626 if (latency > 1900000000 && latency != 2000000000)
627 timeout = 0;
628 else
629 timeout = 100;
630 }
631 local->dynamic_ps_user_timeout = timeout;
632 if (!local->disable_dynamic_ps)
633 conf->dynamic_ps_timeout =
634 local->dynamic_ps_user_timeout;
635
636 if (beaconint_us > latency) {
637 local->ps_sdata = NULL;
638 } else {
639 struct ieee80211_bss *bss;
640 int maxslp = 1;
641 u8 dtimper;
642
643 bss = (void *)found->u.mgd.associated->priv;
644 dtimper = bss->dtim_period;
645
646 /* If the TIM IE is invalid, pretend the value is 1 */
647 if (!dtimper)
648 dtimper = 1;
649 else if (dtimper > 1)
650 maxslp = min_t(int, dtimper,
651 latency / beaconint_us);
652
653 local->hw.conf.max_sleep_period = maxslp;
654 local->hw.conf.ps_dtim_period = dtimper;
655 local->ps_sdata = found;
656 }
657 } else {
658 local->ps_sdata = NULL;
659 }
660
661 change:
662 ieee80211_change_ps(local);
663 }
664
665 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
666 {
667 struct ieee80211_local *local =
668 container_of(work, struct ieee80211_local,
669 dynamic_ps_disable_work);
670
671 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
672 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
673 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
674 }
675
676 ieee80211_wake_queues_by_reason(&local->hw,
677 IEEE80211_QUEUE_STOP_REASON_PS);
678 }
679
680 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
681 {
682 struct ieee80211_local *local =
683 container_of(work, struct ieee80211_local,
684 dynamic_ps_enable_work);
685 struct ieee80211_sub_if_data *sdata = local->ps_sdata;
686 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
687
688 /* can only happen when PS was just disabled anyway */
689 if (!sdata)
690 return;
691
692 if (local->hw.conf.flags & IEEE80211_CONF_PS)
693 return;
694
695 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
696 (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
697 ieee80211_send_nullfunc(local, sdata, 1);
698
699 if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
700 (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
701 (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
702 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
703 local->hw.conf.flags |= IEEE80211_CONF_PS;
704 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
705 }
706 }
707
708 void ieee80211_dynamic_ps_timer(unsigned long data)
709 {
710 struct ieee80211_local *local = (void *) data;
711
712 if (local->quiescing || local->suspended)
713 return;
714
715 ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
716 }
717
718 /* MLME */
719 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
720 struct ieee80211_sub_if_data *sdata,
721 u8 *wmm_param, size_t wmm_param_len)
722 {
723 struct ieee80211_tx_queue_params params;
724 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
725 size_t left;
726 int count;
727 u8 *pos, uapsd_queues = 0;
728
729 if (!local->ops->conf_tx)
730 return;
731
732 if (local->hw.queues < 4)
733 return;
734
735 if (!wmm_param)
736 return;
737
738 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
739 return;
740
741 if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
742 uapsd_queues = local->uapsd_queues;
743
744 count = wmm_param[6] & 0x0f;
745 if (count == ifmgd->wmm_last_param_set)
746 return;
747 ifmgd->wmm_last_param_set = count;
748
749 pos = wmm_param + 8;
750 left = wmm_param_len - 8;
751
752 memset(&params, 0, sizeof(params));
753
754 local->wmm_acm = 0;
755 for (; left >= 4; left -= 4, pos += 4) {
756 int aci = (pos[0] >> 5) & 0x03;
757 int acm = (pos[0] >> 4) & 0x01;
758 bool uapsd = false;
759 int queue;
760
761 switch (aci) {
762 case 1: /* AC_BK */
763 queue = 3;
764 if (acm)
765 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
766 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
767 uapsd = true;
768 break;
769 case 2: /* AC_VI */
770 queue = 1;
771 if (acm)
772 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
773 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
774 uapsd = true;
775 break;
776 case 3: /* AC_VO */
777 queue = 0;
778 if (acm)
779 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
780 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
781 uapsd = true;
782 break;
783 case 0: /* AC_BE */
784 default:
785 queue = 2;
786 if (acm)
787 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
788 if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
789 uapsd = true;
790 break;
791 }
792
793 params.aifs = pos[0] & 0x0f;
794 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
795 params.cw_min = ecw2cw(pos[1] & 0x0f);
796 params.txop = get_unaligned_le16(pos + 2);
797 params.uapsd = uapsd;
798
799 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
800 wiphy_debug(local->hw.wiphy,
801 "WMM queue=%d aci=%d acm=%d aifs=%d "
802 "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
803 queue, aci, acm,
804 params.aifs, params.cw_min, params.cw_max,
805 params.txop, params.uapsd);
806 #endif
807 if (drv_conf_tx(local, queue, &params))
808 wiphy_debug(local->hw.wiphy,
809 "failed to set TX queue parameters for queue %d\n",
810 queue);
811 }
812
813 /* enable WMM or activate new settings */
814 sdata->vif.bss_conf.qos = true;
815 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
816 }
817
818 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
819 u16 capab, bool erp_valid, u8 erp)
820 {
821 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
822 u32 changed = 0;
823 bool use_protection;
824 bool use_short_preamble;
825 bool use_short_slot;
826
827 if (erp_valid) {
828 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
829 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
830 } else {
831 use_protection = false;
832 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
833 }
834
835 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
836 if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
837 use_short_slot = true;
838
839 if (use_protection != bss_conf->use_cts_prot) {
840 bss_conf->use_cts_prot = use_protection;
841 changed |= BSS_CHANGED_ERP_CTS_PROT;
842 }
843
844 if (use_short_preamble != bss_conf->use_short_preamble) {
845 bss_conf->use_short_preamble = use_short_preamble;
846 changed |= BSS_CHANGED_ERP_PREAMBLE;
847 }
848
849 if (use_short_slot != bss_conf->use_short_slot) {
850 bss_conf->use_short_slot = use_short_slot;
851 changed |= BSS_CHANGED_ERP_SLOT;
852 }
853
854 return changed;
855 }
856
857 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
858 struct cfg80211_bss *cbss,
859 u32 bss_info_changed)
860 {
861 struct ieee80211_bss *bss = (void *)cbss->priv;
862 struct ieee80211_local *local = sdata->local;
863 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
864
865 bss_info_changed |= BSS_CHANGED_ASSOC;
866 /* set timing information */
867 bss_conf->beacon_int = cbss->beacon_interval;
868 bss_conf->timestamp = cbss->tsf;
869
870 bss_info_changed |= BSS_CHANGED_BEACON_INT;
871 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
872 cbss->capability, bss->has_erp_value, bss->erp_value);
873
874 sdata->u.mgd.associated = cbss;
875 memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
876
877 sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
878
879 /* just to be sure */
880 sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
881 IEEE80211_STA_BEACON_POLL);
882
883 ieee80211_led_assoc(local, 1);
884
885 if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
886 bss_conf->dtim_period = bss->dtim_period;
887 else
888 bss_conf->dtim_period = 0;
889
890 bss_conf->assoc = 1;
891 /*
892 * For now just always ask the driver to update the basic rateset
893 * when we have associated, we aren't checking whether it actually
894 * changed or not.
895 */
896 bss_info_changed |= BSS_CHANGED_BASIC_RATES;
897
898 /* And the BSSID changed - we're associated now */
899 bss_info_changed |= BSS_CHANGED_BSSID;
900
901 /* Tell the driver to monitor connection quality (if supported) */
902 if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
903 bss_conf->cqm_rssi_thold)
904 bss_info_changed |= BSS_CHANGED_CQM;
905
906 /* Enable ARP filtering */
907 if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
908 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
909 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
910 }
911
912 ieee80211_bss_info_change_notify(sdata, bss_info_changed);
913
914 mutex_lock(&local->iflist_mtx);
915 ieee80211_recalc_ps(local, -1);
916 ieee80211_recalc_smps(local);
917 mutex_unlock(&local->iflist_mtx);
918
919 netif_tx_start_all_queues(sdata->dev);
920 netif_carrier_on(sdata->dev);
921 }
922
923 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
924 bool remove_sta, bool tx)
925 {
926 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
927 struct ieee80211_local *local = sdata->local;
928 struct sta_info *sta;
929 u32 changed = 0, config_changed = 0;
930 u8 bssid[ETH_ALEN];
931
932 ASSERT_MGD_MTX(ifmgd);
933
934 if (WARN_ON(!ifmgd->associated))
935 return;
936
937 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
938
939 ifmgd->associated = NULL;
940 memset(ifmgd->bssid, 0, ETH_ALEN);
941
942 /*
943 * we need to commit the associated = NULL change because the
944 * scan code uses that to determine whether this iface should
945 * go to/wake up from powersave or not -- and could otherwise
946 * wake the queues erroneously.
947 */
948 smp_mb();
949
950 /*
951 * Thus, we can only afterwards stop the queues -- to account
952 * for the case where another CPU is finishing a scan at this
953 * time -- we don't want the scan code to enable queues.
954 */
955
956 netif_tx_stop_all_queues(sdata->dev);
957 netif_carrier_off(sdata->dev);
958
959 mutex_lock(&local->sta_mtx);
960 sta = sta_info_get(sdata, bssid);
961 if (sta) {
962 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
963 ieee80211_sta_tear_down_BA_sessions(sta, tx);
964 }
965 mutex_unlock(&local->sta_mtx);
966
967 changed |= ieee80211_reset_erp_info(sdata);
968
969 ieee80211_led_assoc(local, 0);
970 changed |= BSS_CHANGED_ASSOC;
971 sdata->vif.bss_conf.assoc = false;
972
973 ieee80211_set_wmm_default(sdata);
974
975 /* channel(_type) changes are handled by ieee80211_hw_config */
976 WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
977
978 /* on the next assoc, re-program HT parameters */
979 sdata->ht_opmode_valid = false;
980
981 local->power_constr_level = 0;
982
983 del_timer_sync(&local->dynamic_ps_timer);
984 cancel_work_sync(&local->dynamic_ps_enable_work);
985
986 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
987 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
988 config_changed |= IEEE80211_CONF_CHANGE_PS;
989 }
990
991 ieee80211_hw_config(local, config_changed);
992
993 /* Disable ARP filtering */
994 if (sdata->vif.bss_conf.arp_filter_enabled) {
995 sdata->vif.bss_conf.arp_filter_enabled = false;
996 changed |= BSS_CHANGED_ARP_FILTER;
997 }
998
999 /* The BSSID (not really interesting) and HT changed */
1000 changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1001 ieee80211_bss_info_change_notify(sdata, changed);
1002
1003 if (remove_sta)
1004 sta_info_destroy_addr(sdata, bssid);
1005
1006 del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1007 del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1008 del_timer_sync(&sdata->u.mgd.timer);
1009 del_timer_sync(&sdata->u.mgd.chswitch_timer);
1010 }
1011
1012 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1013 struct ieee80211_hdr *hdr)
1014 {
1015 /*
1016 * We can postpone the mgd.timer whenever receiving unicast frames
1017 * from AP because we know that the connection is working both ways
1018 * at that time. But multicast frames (and hence also beacons) must
1019 * be ignored here, because we need to trigger the timer during
1020 * data idle periods for sending the periodic probe request to the
1021 * AP we're connected to.
1022 */
1023 if (is_multicast_ether_addr(hdr->addr1))
1024 return;
1025
1026 ieee80211_sta_reset_conn_monitor(sdata);
1027 }
1028
1029 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1030 {
1031 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1032 const u8 *ssid;
1033 u8 *dst = ifmgd->associated->bssid;
1034 u8 unicast_limit = max(1, IEEE80211_MAX_PROBE_TRIES - 3);
1035
1036 /*
1037 * Try sending broadcast probe requests for the last three
1038 * probe requests after the first ones failed since some
1039 * buggy APs only support broadcast probe requests.
1040 */
1041 if (ifmgd->probe_send_count >= unicast_limit)
1042 dst = NULL;
1043
1044 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1045 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1046
1047 ifmgd->probe_send_count++;
1048 ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
1049 run_again(ifmgd, ifmgd->probe_timeout);
1050 }
1051
1052 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1053 bool beacon)
1054 {
1055 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1056 bool already = false;
1057
1058 if (!ieee80211_sdata_running(sdata))
1059 return;
1060
1061 if (sdata->local->scanning)
1062 return;
1063
1064 if (sdata->local->tmp_channel)
1065 return;
1066
1067 mutex_lock(&ifmgd->mtx);
1068
1069 if (!ifmgd->associated)
1070 goto out;
1071
1072 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1073 if (beacon && net_ratelimit())
1074 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1075 "- sending probe request\n", sdata->name);
1076 #endif
1077
1078 /*
1079 * The driver/our work has already reported this event or the
1080 * connection monitoring has kicked in and we have already sent
1081 * a probe request. Or maybe the AP died and the driver keeps
1082 * reporting until we disassociate...
1083 *
1084 * In either case we have to ignore the current call to this
1085 * function (except for setting the correct probe reason bit)
1086 * because otherwise we would reset the timer every time and
1087 * never check whether we received a probe response!
1088 */
1089 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1090 IEEE80211_STA_CONNECTION_POLL))
1091 already = true;
1092
1093 if (beacon)
1094 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1095 else
1096 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1097
1098 if (already)
1099 goto out;
1100
1101 mutex_lock(&sdata->local->iflist_mtx);
1102 ieee80211_recalc_ps(sdata->local, -1);
1103 mutex_unlock(&sdata->local->iflist_mtx);
1104
1105 ifmgd->probe_send_count = 0;
1106 ieee80211_mgd_probe_ap_send(sdata);
1107 out:
1108 mutex_unlock(&ifmgd->mtx);
1109 }
1110
1111 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1112 {
1113 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1114 struct ieee80211_local *local = sdata->local;
1115 u8 bssid[ETH_ALEN];
1116
1117 mutex_lock(&ifmgd->mtx);
1118 if (!ifmgd->associated) {
1119 mutex_unlock(&ifmgd->mtx);
1120 return;
1121 }
1122
1123 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1124
1125 printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
1126
1127 ieee80211_set_disassoc(sdata, true, true);
1128 mutex_unlock(&ifmgd->mtx);
1129
1130 mutex_lock(&local->mtx);
1131 ieee80211_recalc_idle(local);
1132 mutex_unlock(&local->mtx);
1133 /*
1134 * must be outside lock due to cfg80211,
1135 * but that's not a problem.
1136 */
1137 ieee80211_send_deauth_disassoc(sdata, bssid,
1138 IEEE80211_STYPE_DEAUTH,
1139 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1140 NULL, true);
1141 }
1142
1143 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1144 {
1145 struct ieee80211_sub_if_data *sdata =
1146 container_of(work, struct ieee80211_sub_if_data,
1147 u.mgd.beacon_connection_loss_work);
1148
1149 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1150 __ieee80211_connection_loss(sdata);
1151 else
1152 ieee80211_mgd_probe_ap(sdata, true);
1153 }
1154
1155 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1156 {
1157 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1158 struct ieee80211_hw *hw = &sdata->local->hw;
1159
1160 trace_api_beacon_loss(sdata);
1161
1162 WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1163 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1164 }
1165 EXPORT_SYMBOL(ieee80211_beacon_loss);
1166
1167 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1168 {
1169 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1170 struct ieee80211_hw *hw = &sdata->local->hw;
1171
1172 trace_api_connection_loss(sdata);
1173
1174 WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1175 ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1176 }
1177 EXPORT_SYMBOL(ieee80211_connection_loss);
1178
1179
1180 static enum rx_mgmt_action __must_check
1181 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1182 struct ieee80211_mgmt *mgmt, size_t len)
1183 {
1184 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1185 const u8 *bssid = NULL;
1186 u16 reason_code;
1187
1188 if (len < 24 + 2)
1189 return RX_MGMT_NONE;
1190
1191 ASSERT_MGD_MTX(ifmgd);
1192
1193 bssid = ifmgd->associated->bssid;
1194
1195 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1196
1197 printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1198 sdata->name, bssid, reason_code);
1199
1200 ieee80211_set_disassoc(sdata, true, false);
1201 mutex_lock(&sdata->local->mtx);
1202 ieee80211_recalc_idle(sdata->local);
1203 mutex_unlock(&sdata->local->mtx);
1204
1205 return RX_MGMT_CFG80211_DEAUTH;
1206 }
1207
1208
1209 static enum rx_mgmt_action __must_check
1210 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1211 struct ieee80211_mgmt *mgmt, size_t len)
1212 {
1213 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1214 u16 reason_code;
1215
1216 if (len < 24 + 2)
1217 return RX_MGMT_NONE;
1218
1219 ASSERT_MGD_MTX(ifmgd);
1220
1221 if (WARN_ON(!ifmgd->associated))
1222 return RX_MGMT_NONE;
1223
1224 if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1225 return RX_MGMT_NONE;
1226
1227 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1228
1229 printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1230 sdata->name, mgmt->sa, reason_code);
1231
1232 ieee80211_set_disassoc(sdata, true, false);
1233 mutex_lock(&sdata->local->mtx);
1234 ieee80211_recalc_idle(sdata->local);
1235 mutex_unlock(&sdata->local->mtx);
1236 return RX_MGMT_CFG80211_DISASSOC;
1237 }
1238
1239
1240 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1241 struct ieee80211_mgmt *mgmt, size_t len)
1242 {
1243 struct ieee80211_sub_if_data *sdata = wk->sdata;
1244 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1245 struct ieee80211_local *local = sdata->local;
1246 struct ieee80211_supported_band *sband;
1247 struct sta_info *sta;
1248 struct cfg80211_bss *cbss = wk->assoc.bss;
1249 u8 *pos;
1250 u32 rates, basic_rates;
1251 u16 capab_info, aid;
1252 struct ieee802_11_elems elems;
1253 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1254 u32 changed = 0;
1255 int i, j, err;
1256 bool have_higher_than_11mbit = false;
1257 u16 ap_ht_cap_flags;
1258
1259 /* AssocResp and ReassocResp have identical structure */
1260
1261 aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1262 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1263
1264 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1265 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1266 "set\n", sdata->name, aid);
1267 aid &= ~(BIT(15) | BIT(14));
1268
1269 pos = mgmt->u.assoc_resp.variable;
1270 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1271
1272 if (!elems.supp_rates) {
1273 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1274 sdata->name);
1275 return false;
1276 }
1277
1278 ifmgd->aid = aid;
1279
1280 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1281 if (!sta) {
1282 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1283 " the AP\n", sdata->name);
1284 return false;
1285 }
1286
1287 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1288 WLAN_STA_ASSOC_AP);
1289 if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1290 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1291
1292 rates = 0;
1293 basic_rates = 0;
1294 sband = local->hw.wiphy->bands[wk->chan->band];
1295
1296 for (i = 0; i < elems.supp_rates_len; i++) {
1297 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1298 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1299
1300 if (rate > 110)
1301 have_higher_than_11mbit = true;
1302
1303 for (j = 0; j < sband->n_bitrates; j++) {
1304 if (sband->bitrates[j].bitrate == rate) {
1305 rates |= BIT(j);
1306 if (is_basic)
1307 basic_rates |= BIT(j);
1308 break;
1309 }
1310 }
1311 }
1312
1313 for (i = 0; i < elems.ext_supp_rates_len; i++) {
1314 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1315 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1316
1317 if (rate > 110)
1318 have_higher_than_11mbit = true;
1319
1320 for (j = 0; j < sband->n_bitrates; j++) {
1321 if (sband->bitrates[j].bitrate == rate) {
1322 rates |= BIT(j);
1323 if (is_basic)
1324 basic_rates |= BIT(j);
1325 break;
1326 }
1327 }
1328 }
1329
1330 sta->sta.supp_rates[wk->chan->band] = rates;
1331 sdata->vif.bss_conf.basic_rates = basic_rates;
1332
1333 /* cf. IEEE 802.11 9.2.12 */
1334 if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1335 have_higher_than_11mbit)
1336 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1337 else
1338 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1339
1340 if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1341 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1342 elems.ht_cap_elem, &sta->sta.ht_cap);
1343
1344 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1345
1346 rate_control_rate_init(sta);
1347
1348 if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1349 set_sta_flags(sta, WLAN_STA_MFP);
1350
1351 if (elems.wmm_param)
1352 set_sta_flags(sta, WLAN_STA_WME);
1353
1354 err = sta_info_insert(sta);
1355 sta = NULL;
1356 if (err) {
1357 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1358 " the AP (error %d)\n", sdata->name, err);
1359 return false;
1360 }
1361
1362 /*
1363 * Always handle WMM once after association regardless
1364 * of the first value the AP uses. Setting -1 here has
1365 * that effect because the AP values is an unsigned
1366 * 4-bit value.
1367 */
1368 ifmgd->wmm_last_param_set = -1;
1369
1370 if (elems.wmm_param)
1371 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1372 elems.wmm_param_len);
1373 else
1374 ieee80211_set_wmm_default(sdata);
1375
1376 local->oper_channel = wk->chan;
1377
1378 if (elems.ht_info_elem && elems.wmm_param &&
1379 (sdata->local->hw.queues >= 4) &&
1380 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1381 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1382 cbss->bssid, ap_ht_cap_flags);
1383
1384 /* set AID and assoc capability,
1385 * ieee80211_set_associated() will tell the driver */
1386 bss_conf->aid = aid;
1387 bss_conf->assoc_capability = capab_info;
1388 ieee80211_set_associated(sdata, cbss, changed);
1389
1390 /*
1391 * If we're using 4-addr mode, let the AP know that we're
1392 * doing so, so that it can create the STA VLAN on its side
1393 */
1394 if (ifmgd->use_4addr)
1395 ieee80211_send_4addr_nullfunc(local, sdata);
1396
1397 /*
1398 * Start timer to probe the connection to the AP now.
1399 * Also start the timer that will detect beacon loss.
1400 */
1401 ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1402 ieee80211_sta_reset_beacon_monitor(sdata);
1403
1404 return true;
1405 }
1406
1407
1408 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1409 struct ieee80211_mgmt *mgmt,
1410 size_t len,
1411 struct ieee80211_rx_status *rx_status,
1412 struct ieee802_11_elems *elems,
1413 bool beacon)
1414 {
1415 struct ieee80211_local *local = sdata->local;
1416 int freq;
1417 struct ieee80211_bss *bss;
1418 struct ieee80211_channel *channel;
1419 bool need_ps = false;
1420
1421 if (sdata->u.mgd.associated) {
1422 bss = (void *)sdata->u.mgd.associated->priv;
1423 /* not previously set so we may need to recalc */
1424 need_ps = !bss->dtim_period;
1425 }
1426
1427 if (elems->ds_params && elems->ds_params_len == 1)
1428 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1429 else
1430 freq = rx_status->freq;
1431
1432 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1433
1434 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1435 return;
1436
1437 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1438 channel, beacon);
1439 if (bss)
1440 ieee80211_rx_bss_put(local, bss);
1441
1442 if (!sdata->u.mgd.associated)
1443 return;
1444
1445 if (need_ps) {
1446 mutex_lock(&local->iflist_mtx);
1447 ieee80211_recalc_ps(local, -1);
1448 mutex_unlock(&local->iflist_mtx);
1449 }
1450
1451 if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1452 (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1453 ETH_ALEN) == 0)) {
1454 struct ieee80211_channel_sw_ie *sw_elem =
1455 (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1456 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1457 bss, rx_status->mactime);
1458 }
1459 }
1460
1461
1462 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1463 struct sk_buff *skb)
1464 {
1465 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1466 struct ieee80211_if_managed *ifmgd;
1467 struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1468 size_t baselen, len = skb->len;
1469 struct ieee802_11_elems elems;
1470
1471 ifmgd = &sdata->u.mgd;
1472
1473 ASSERT_MGD_MTX(ifmgd);
1474
1475 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1476 return; /* ignore ProbeResp to foreign address */
1477
1478 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1479 if (baselen > len)
1480 return;
1481
1482 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1483 &elems);
1484
1485 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1486
1487 if (ifmgd->associated &&
1488 memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1489 ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1490 IEEE80211_STA_CONNECTION_POLL)) {
1491 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1492 IEEE80211_STA_BEACON_POLL);
1493 mutex_lock(&sdata->local->iflist_mtx);
1494 ieee80211_recalc_ps(sdata->local, -1);
1495 mutex_unlock(&sdata->local->iflist_mtx);
1496
1497 if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1498 return;
1499
1500 /*
1501 * We've received a probe response, but are not sure whether
1502 * we have or will be receiving any beacons or data, so let's
1503 * schedule the timers again, just in case.
1504 */
1505 ieee80211_sta_reset_beacon_monitor(sdata);
1506
1507 mod_timer(&ifmgd->conn_mon_timer,
1508 round_jiffies_up(jiffies +
1509 IEEE80211_CONNECTION_IDLE_TIME));
1510 }
1511 }
1512
1513 /*
1514 * This is the canonical list of information elements we care about,
1515 * the filter code also gives us all changes to the Microsoft OUI
1516 * (00:50:F2) vendor IE which is used for WMM which we need to track.
1517 *
1518 * We implement beacon filtering in software since that means we can
1519 * avoid processing the frame here and in cfg80211, and userspace
1520 * will not be able to tell whether the hardware supports it or not.
1521 *
1522 * XXX: This list needs to be dynamic -- userspace needs to be able to
1523 * add items it requires. It also needs to be able to tell us to
1524 * look out for other vendor IEs.
1525 */
1526 static const u64 care_about_ies =
1527 (1ULL << WLAN_EID_COUNTRY) |
1528 (1ULL << WLAN_EID_ERP_INFO) |
1529 (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1530 (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1531 (1ULL << WLAN_EID_HT_CAPABILITY) |
1532 (1ULL << WLAN_EID_HT_INFORMATION);
1533
1534 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1535 struct ieee80211_mgmt *mgmt,
1536 size_t len,
1537 struct ieee80211_rx_status *rx_status)
1538 {
1539 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1540 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1541 size_t baselen;
1542 struct ieee802_11_elems elems;
1543 struct ieee80211_local *local = sdata->local;
1544 u32 changed = 0;
1545 bool erp_valid, directed_tim = false;
1546 u8 erp_value = 0;
1547 u32 ncrc;
1548 u8 *bssid;
1549
1550 ASSERT_MGD_MTX(ifmgd);
1551
1552 /* Process beacon from the current BSS */
1553 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1554 if (baselen > len)
1555 return;
1556
1557 if (rx_status->freq != local->hw.conf.channel->center_freq)
1558 return;
1559
1560 /*
1561 * We might have received a number of frames, among them a
1562 * disassoc frame and a beacon...
1563 */
1564 if (!ifmgd->associated)
1565 return;
1566
1567 bssid = ifmgd->associated->bssid;
1568
1569 /*
1570 * And in theory even frames from a different AP we were just
1571 * associated to a split-second ago!
1572 */
1573 if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1574 return;
1575
1576 /* Track average RSSI from the Beacon frames of the current AP */
1577 ifmgd->last_beacon_signal = rx_status->signal;
1578 if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1579 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1580 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1581 ifmgd->last_cqm_event_signal = 0;
1582 ifmgd->count_beacon_signal = 1;
1583 } else {
1584 ifmgd->ave_beacon_signal =
1585 (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1586 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1587 ifmgd->ave_beacon_signal) / 16;
1588 ifmgd->count_beacon_signal++;
1589 }
1590 if (bss_conf->cqm_rssi_thold &&
1591 ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1592 !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1593 int sig = ifmgd->ave_beacon_signal / 16;
1594 int last_event = ifmgd->last_cqm_event_signal;
1595 int thold = bss_conf->cqm_rssi_thold;
1596 int hyst = bss_conf->cqm_rssi_hyst;
1597 if (sig < thold &&
1598 (last_event == 0 || sig < last_event - hyst)) {
1599 ifmgd->last_cqm_event_signal = sig;
1600 ieee80211_cqm_rssi_notify(
1601 &sdata->vif,
1602 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1603 GFP_KERNEL);
1604 } else if (sig > thold &&
1605 (last_event == 0 || sig > last_event + hyst)) {
1606 ifmgd->last_cqm_event_signal = sig;
1607 ieee80211_cqm_rssi_notify(
1608 &sdata->vif,
1609 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1610 GFP_KERNEL);
1611 }
1612 }
1613
1614 if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1615 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1616 if (net_ratelimit()) {
1617 printk(KERN_DEBUG "%s: cancelling probereq poll due "
1618 "to a received beacon\n", sdata->name);
1619 }
1620 #endif
1621 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1622 mutex_lock(&local->iflist_mtx);
1623 ieee80211_recalc_ps(local, -1);
1624 mutex_unlock(&local->iflist_mtx);
1625 }
1626
1627 /*
1628 * Push the beacon loss detection into the future since
1629 * we are processing a beacon from the AP just now.
1630 */
1631 ieee80211_sta_reset_beacon_monitor(sdata);
1632
1633 ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1634 ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1635 len - baselen, &elems,
1636 care_about_ies, ncrc);
1637
1638 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1639 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1640 ifmgd->aid);
1641
1642 if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1643 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1644 true);
1645
1646 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1647 elems.wmm_param_len);
1648 }
1649
1650 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1651 if (directed_tim) {
1652 if (local->hw.conf.dynamic_ps_timeout > 0) {
1653 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1654 ieee80211_hw_config(local,
1655 IEEE80211_CONF_CHANGE_PS);
1656 ieee80211_send_nullfunc(local, sdata, 0);
1657 } else {
1658 local->pspolling = true;
1659
1660 /*
1661 * Here is assumed that the driver will be
1662 * able to send ps-poll frame and receive a
1663 * response even though power save mode is
1664 * enabled, but some drivers might require
1665 * to disable power save here. This needs
1666 * to be investigated.
1667 */
1668 ieee80211_send_pspoll(local, sdata);
1669 }
1670 }
1671 }
1672
1673 if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1674 return;
1675 ifmgd->beacon_crc = ncrc;
1676 ifmgd->beacon_crc_valid = true;
1677
1678 if (elems.erp_info && elems.erp_info_len >= 1) {
1679 erp_valid = true;
1680 erp_value = elems.erp_info[0];
1681 } else {
1682 erp_valid = false;
1683 }
1684 changed |= ieee80211_handle_bss_capability(sdata,
1685 le16_to_cpu(mgmt->u.beacon.capab_info),
1686 erp_valid, erp_value);
1687
1688
1689 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1690 !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1691 struct sta_info *sta;
1692 struct ieee80211_supported_band *sband;
1693 u16 ap_ht_cap_flags;
1694
1695 rcu_read_lock();
1696
1697 sta = sta_info_get(sdata, bssid);
1698 if (WARN_ON(!sta)) {
1699 rcu_read_unlock();
1700 return;
1701 }
1702
1703 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1704
1705 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1706 elems.ht_cap_elem, &sta->sta.ht_cap);
1707
1708 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1709
1710 rcu_read_unlock();
1711
1712 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1713 bssid, ap_ht_cap_flags);
1714 }
1715
1716 /* Note: country IE parsing is done for us by cfg80211 */
1717 if (elems.country_elem) {
1718 /* TODO: IBSS also needs this */
1719 if (elems.pwr_constr_elem)
1720 ieee80211_handle_pwr_constr(sdata,
1721 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1722 elems.pwr_constr_elem,
1723 elems.pwr_constr_elem_len);
1724 }
1725
1726 ieee80211_bss_info_change_notify(sdata, changed);
1727 }
1728
1729 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1730 struct sk_buff *skb)
1731 {
1732 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1733 struct ieee80211_rx_status *rx_status;
1734 struct ieee80211_mgmt *mgmt;
1735 enum rx_mgmt_action rma = RX_MGMT_NONE;
1736 u16 fc;
1737
1738 rx_status = (struct ieee80211_rx_status *) skb->cb;
1739 mgmt = (struct ieee80211_mgmt *) skb->data;
1740 fc = le16_to_cpu(mgmt->frame_control);
1741
1742 mutex_lock(&ifmgd->mtx);
1743
1744 if (ifmgd->associated &&
1745 memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1746 switch (fc & IEEE80211_FCTL_STYPE) {
1747 case IEEE80211_STYPE_BEACON:
1748 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1749 rx_status);
1750 break;
1751 case IEEE80211_STYPE_PROBE_RESP:
1752 ieee80211_rx_mgmt_probe_resp(sdata, skb);
1753 break;
1754 case IEEE80211_STYPE_DEAUTH:
1755 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1756 break;
1757 case IEEE80211_STYPE_DISASSOC:
1758 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1759 break;
1760 case IEEE80211_STYPE_ACTION:
1761 switch (mgmt->u.action.category) {
1762 case WLAN_CATEGORY_SPECTRUM_MGMT:
1763 ieee80211_sta_process_chanswitch(sdata,
1764 &mgmt->u.action.u.chan_switch.sw_elem,
1765 (void *)ifmgd->associated->priv,
1766 rx_status->mactime);
1767 break;
1768 }
1769 }
1770 mutex_unlock(&ifmgd->mtx);
1771
1772 switch (rma) {
1773 case RX_MGMT_NONE:
1774 /* no action */
1775 break;
1776 case RX_MGMT_CFG80211_DEAUTH:
1777 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1778 break;
1779 case RX_MGMT_CFG80211_DISASSOC:
1780 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1781 break;
1782 default:
1783 WARN(1, "unexpected: %d", rma);
1784 }
1785 return;
1786 }
1787
1788 mutex_unlock(&ifmgd->mtx);
1789
1790 if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1791 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1792 struct ieee80211_local *local = sdata->local;
1793 struct ieee80211_work *wk;
1794
1795 mutex_lock(&local->mtx);
1796 list_for_each_entry(wk, &local->work_list, list) {
1797 if (wk->sdata != sdata)
1798 continue;
1799
1800 if (wk->type != IEEE80211_WORK_ASSOC &&
1801 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1802 continue;
1803
1804 if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1805 continue;
1806 if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1807 continue;
1808
1809 /*
1810 * Printing the message only here means we can't
1811 * spuriously print it, but it also means that it
1812 * won't be printed when the frame comes in before
1813 * we even tried to associate or in similar cases.
1814 *
1815 * Ultimately, I suspect cfg80211 should print the
1816 * messages instead.
1817 */
1818 printk(KERN_DEBUG
1819 "%s: deauthenticated from %pM (Reason: %u)\n",
1820 sdata->name, mgmt->bssid,
1821 le16_to_cpu(mgmt->u.deauth.reason_code));
1822
1823 list_del_rcu(&wk->list);
1824 free_work(wk);
1825 break;
1826 }
1827 mutex_unlock(&local->mtx);
1828
1829 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1830 }
1831 }
1832
1833 static void ieee80211_sta_timer(unsigned long data)
1834 {
1835 struct ieee80211_sub_if_data *sdata =
1836 (struct ieee80211_sub_if_data *) data;
1837 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1838 struct ieee80211_local *local = sdata->local;
1839
1840 if (local->quiescing) {
1841 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1842 return;
1843 }
1844
1845 ieee80211_queue_work(&local->hw, &sdata->work);
1846 }
1847
1848 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1849 {
1850 struct ieee80211_local *local = sdata->local;
1851 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1852
1853 /* then process the rest of the work */
1854 mutex_lock(&ifmgd->mtx);
1855
1856 if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1857 IEEE80211_STA_CONNECTION_POLL) &&
1858 ifmgd->associated) {
1859 u8 bssid[ETH_ALEN];
1860
1861 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1862 if (time_is_after_jiffies(ifmgd->probe_timeout))
1863 run_again(ifmgd, ifmgd->probe_timeout);
1864
1865 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1866 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1867 wiphy_debug(local->hw.wiphy,
1868 "%s: No probe response from AP %pM"
1869 " after %dms, try %d\n",
1870 sdata->name,
1871 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ,
1872 ifmgd->probe_send_count);
1873 #endif
1874 ieee80211_mgd_probe_ap_send(sdata);
1875 } else {
1876 /*
1877 * We actually lost the connection ... or did we?
1878 * Let's make sure!
1879 */
1880 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1881 IEEE80211_STA_BEACON_POLL);
1882 wiphy_debug(local->hw.wiphy,
1883 "%s: No probe response from AP %pM"
1884 " after %dms, disconnecting.\n",
1885 sdata->name,
1886 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1887 ieee80211_set_disassoc(sdata, true, true);
1888 mutex_unlock(&ifmgd->mtx);
1889 mutex_lock(&local->mtx);
1890 ieee80211_recalc_idle(local);
1891 mutex_unlock(&local->mtx);
1892 /*
1893 * must be outside lock due to cfg80211,
1894 * but that's not a problem.
1895 */
1896 ieee80211_send_deauth_disassoc(sdata, bssid,
1897 IEEE80211_STYPE_DEAUTH,
1898 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1899 NULL, true);
1900 mutex_lock(&ifmgd->mtx);
1901 }
1902 }
1903
1904 mutex_unlock(&ifmgd->mtx);
1905 }
1906
1907 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1908 {
1909 struct ieee80211_sub_if_data *sdata =
1910 (struct ieee80211_sub_if_data *) data;
1911 struct ieee80211_local *local = sdata->local;
1912
1913 if (local->quiescing)
1914 return;
1915
1916 ieee80211_queue_work(&sdata->local->hw,
1917 &sdata->u.mgd.beacon_connection_loss_work);
1918 }
1919
1920 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1921 {
1922 struct ieee80211_sub_if_data *sdata =
1923 (struct ieee80211_sub_if_data *) data;
1924 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1925 struct ieee80211_local *local = sdata->local;
1926
1927 if (local->quiescing)
1928 return;
1929
1930 ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1931 }
1932
1933 static void ieee80211_sta_monitor_work(struct work_struct *work)
1934 {
1935 struct ieee80211_sub_if_data *sdata =
1936 container_of(work, struct ieee80211_sub_if_data,
1937 u.mgd.monitor_work);
1938
1939 ieee80211_mgd_probe_ap(sdata, false);
1940 }
1941
1942 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1943 {
1944 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1945 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1946 IEEE80211_STA_CONNECTION_POLL);
1947
1948 /* let's probe the connection once */
1949 ieee80211_queue_work(&sdata->local->hw,
1950 &sdata->u.mgd.monitor_work);
1951 /* and do all the other regular work too */
1952 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1953 }
1954 }
1955
1956 #ifdef CONFIG_PM
1957 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1958 {
1959 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1960
1961 /*
1962 * we need to use atomic bitops for the running bits
1963 * only because both timers might fire at the same
1964 * time -- the code here is properly synchronised.
1965 */
1966
1967 cancel_work_sync(&ifmgd->request_smps_work);
1968
1969 cancel_work_sync(&ifmgd->beacon_connection_loss_work);
1970 if (del_timer_sync(&ifmgd->timer))
1971 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1972
1973 cancel_work_sync(&ifmgd->chswitch_work);
1974 if (del_timer_sync(&ifmgd->chswitch_timer))
1975 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1976
1977 cancel_work_sync(&ifmgd->monitor_work);
1978 /* these will just be re-established on connection */
1979 del_timer_sync(&ifmgd->conn_mon_timer);
1980 del_timer_sync(&ifmgd->bcn_mon_timer);
1981 }
1982
1983 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1984 {
1985 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1986
1987 if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1988 add_timer(&ifmgd->timer);
1989 if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1990 add_timer(&ifmgd->chswitch_timer);
1991 }
1992 #endif
1993
1994 /* interface setup */
1995 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1996 {
1997 struct ieee80211_if_managed *ifmgd;
1998
1999 ifmgd = &sdata->u.mgd;
2000 INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2001 INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2002 INIT_WORK(&ifmgd->beacon_connection_loss_work,
2003 ieee80211_beacon_connection_loss_work);
2004 INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2005 setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2006 (unsigned long) sdata);
2007 setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2008 (unsigned long) sdata);
2009 setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2010 (unsigned long) sdata);
2011 setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2012 (unsigned long) sdata);
2013
2014 ifmgd->flags = 0;
2015
2016 mutex_init(&ifmgd->mtx);
2017
2018 if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2019 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2020 else
2021 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2022 }
2023
2024 /* scan finished notification */
2025 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2026 {
2027 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2028
2029 /* Restart STA timers */
2030 rcu_read_lock();
2031 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2032 ieee80211_restart_sta_timer(sdata);
2033 rcu_read_unlock();
2034 }
2035
2036 int ieee80211_max_network_latency(struct notifier_block *nb,
2037 unsigned long data, void *dummy)
2038 {
2039 s32 latency_usec = (s32) data;
2040 struct ieee80211_local *local =
2041 container_of(nb, struct ieee80211_local,
2042 network_latency_notifier);
2043
2044 mutex_lock(&local->iflist_mtx);
2045 ieee80211_recalc_ps(local, latency_usec);
2046 mutex_unlock(&local->iflist_mtx);
2047
2048 return 0;
2049 }
2050
2051 /* config hooks */
2052 static enum work_done_result
2053 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2054 struct sk_buff *skb)
2055 {
2056 if (!skb) {
2057 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2058 return WORK_DONE_DESTROY;
2059 }
2060
2061 if (wk->type == IEEE80211_WORK_AUTH) {
2062 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2063 return WORK_DONE_DESTROY;
2064 }
2065
2066 mutex_lock(&wk->sdata->u.mgd.mtx);
2067 ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2068 mutex_unlock(&wk->sdata->u.mgd.mtx);
2069
2070 wk->type = IEEE80211_WORK_AUTH;
2071 wk->probe_auth.tries = 0;
2072 return WORK_DONE_REQUEUE;
2073 }
2074
2075 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2076 struct cfg80211_auth_request *req)
2077 {
2078 const u8 *ssid;
2079 struct ieee80211_work *wk;
2080 u16 auth_alg;
2081
2082 if (req->local_state_change)
2083 return 0; /* no need to update mac80211 state */
2084
2085 switch (req->auth_type) {
2086 case NL80211_AUTHTYPE_OPEN_SYSTEM:
2087 auth_alg = WLAN_AUTH_OPEN;
2088 break;
2089 case NL80211_AUTHTYPE_SHARED_KEY:
2090 if (IS_ERR(sdata->local->wep_tx_tfm))
2091 return -EOPNOTSUPP;
2092 auth_alg = WLAN_AUTH_SHARED_KEY;
2093 break;
2094 case NL80211_AUTHTYPE_FT:
2095 auth_alg = WLAN_AUTH_FT;
2096 break;
2097 case NL80211_AUTHTYPE_NETWORK_EAP:
2098 auth_alg = WLAN_AUTH_LEAP;
2099 break;
2100 default:
2101 return -EOPNOTSUPP;
2102 }
2103
2104 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2105 if (!wk)
2106 return -ENOMEM;
2107
2108 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2109
2110 if (req->ie && req->ie_len) {
2111 memcpy(wk->ie, req->ie, req->ie_len);
2112 wk->ie_len = req->ie_len;
2113 }
2114
2115 if (req->key && req->key_len) {
2116 wk->probe_auth.key_len = req->key_len;
2117 wk->probe_auth.key_idx = req->key_idx;
2118 memcpy(wk->probe_auth.key, req->key, req->key_len);
2119 }
2120
2121 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2122 memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2123 wk->probe_auth.ssid_len = ssid[1];
2124
2125 wk->probe_auth.algorithm = auth_alg;
2126 wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2127
2128 /* if we already have a probe, don't probe again */
2129 if (req->bss->proberesp_ies)
2130 wk->type = IEEE80211_WORK_AUTH;
2131 else
2132 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2133 wk->chan = req->bss->channel;
2134 wk->sdata = sdata;
2135 wk->done = ieee80211_probe_auth_done;
2136
2137 ieee80211_add_work(wk);
2138 return 0;
2139 }
2140
2141 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2142 struct sk_buff *skb)
2143 {
2144 struct ieee80211_mgmt *mgmt;
2145 struct ieee80211_rx_status *rx_status;
2146 struct ieee802_11_elems elems;
2147 u16 status;
2148
2149 if (!skb) {
2150 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2151 return WORK_DONE_DESTROY;
2152 }
2153
2154 if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2155 mutex_lock(&wk->sdata->u.mgd.mtx);
2156 rx_status = (void *) skb->cb;
2157 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2158 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2159 &elems, true);
2160 mutex_unlock(&wk->sdata->u.mgd.mtx);
2161
2162 wk->type = IEEE80211_WORK_ASSOC;
2163 /* not really done yet */
2164 return WORK_DONE_REQUEUE;
2165 }
2166
2167 mgmt = (void *)skb->data;
2168 status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2169
2170 if (status == WLAN_STATUS_SUCCESS) {
2171 mutex_lock(&wk->sdata->u.mgd.mtx);
2172 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2173 mutex_unlock(&wk->sdata->u.mgd.mtx);
2174 /* oops -- internal error -- send timeout for now */
2175 cfg80211_send_assoc_timeout(wk->sdata->dev,
2176 wk->filter_ta);
2177 return WORK_DONE_DESTROY;
2178 }
2179
2180 mutex_unlock(&wk->sdata->u.mgd.mtx);
2181 }
2182
2183 cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2184 return WORK_DONE_DESTROY;
2185 }
2186
2187 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2188 struct cfg80211_assoc_request *req)
2189 {
2190 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2191 struct ieee80211_bss *bss = (void *)req->bss->priv;
2192 struct ieee80211_work *wk;
2193 const u8 *ssid;
2194 int i;
2195
2196 mutex_lock(&ifmgd->mtx);
2197 if (ifmgd->associated) {
2198 if (!req->prev_bssid ||
2199 memcmp(req->prev_bssid, ifmgd->associated->bssid,
2200 ETH_ALEN)) {
2201 /*
2202 * We are already associated and the request was not a
2203 * reassociation request from the current BSS, so
2204 * reject it.
2205 */
2206 mutex_unlock(&ifmgd->mtx);
2207 return -EALREADY;
2208 }
2209
2210 /* Trying to reassociate - clear previous association state */
2211 ieee80211_set_disassoc(sdata, true, false);
2212 }
2213 mutex_unlock(&ifmgd->mtx);
2214
2215 wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2216 if (!wk)
2217 return -ENOMEM;
2218
2219 ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2220 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2221
2222 ifmgd->beacon_crc_valid = false;
2223
2224 for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2225 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2226 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2227 req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2228 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2229
2230
2231 if (req->ie && req->ie_len) {
2232 memcpy(wk->ie, req->ie, req->ie_len);
2233 wk->ie_len = req->ie_len;
2234 } else
2235 wk->ie_len = 0;
2236
2237 wk->assoc.bss = req->bss;
2238
2239 memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2240
2241 /* new association always uses requested smps mode */
2242 if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2243 if (ifmgd->powersave)
2244 ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2245 else
2246 ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2247 } else
2248 ifmgd->ap_smps = ifmgd->req_smps;
2249
2250 wk->assoc.smps = ifmgd->ap_smps;
2251 /*
2252 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2253 * We still associate in non-HT mode (11a/b/g) if any one of these
2254 * ciphers is configured as pairwise.
2255 * We can set this to true for non-11n hardware, that'll be checked
2256 * separately along with the peer capabilities.
2257 */
2258 wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2259 wk->assoc.capability = req->bss->capability;
2260 wk->assoc.wmm_used = bss->wmm_used;
2261 wk->assoc.supp_rates = bss->supp_rates;
2262 wk->assoc.supp_rates_len = bss->supp_rates_len;
2263 wk->assoc.ht_information_ie =
2264 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2265
2266 if (bss->wmm_used && bss->uapsd_supported &&
2267 (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2268 wk->assoc.uapsd_used = true;
2269 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2270 } else {
2271 wk->assoc.uapsd_used = false;
2272 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2273 }
2274
2275 ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2276 memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2277 wk->assoc.ssid_len = ssid[1];
2278
2279 if (req->prev_bssid)
2280 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2281
2282 wk->chan = req->bss->channel;
2283 wk->sdata = sdata;
2284 wk->done = ieee80211_assoc_done;
2285 if (!bss->dtim_period &&
2286 sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2287 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2288 else
2289 wk->type = IEEE80211_WORK_ASSOC;
2290
2291 if (req->use_mfp) {
2292 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2293 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2294 } else {
2295 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2296 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2297 }
2298
2299 if (req->crypto.control_port)
2300 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2301 else
2302 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2303
2304 sdata->control_port_protocol = req->crypto.control_port_ethertype;
2305 sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2306
2307 ieee80211_add_work(wk);
2308 return 0;
2309 }
2310
2311 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2312 struct cfg80211_deauth_request *req,
2313 void *cookie)
2314 {
2315 struct ieee80211_local *local = sdata->local;
2316 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2317 struct ieee80211_work *wk;
2318 u8 bssid[ETH_ALEN];
2319 bool assoc_bss = false;
2320
2321 mutex_lock(&ifmgd->mtx);
2322
2323 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2324 if (ifmgd->associated == req->bss) {
2325 ieee80211_set_disassoc(sdata, false, true);
2326 mutex_unlock(&ifmgd->mtx);
2327 assoc_bss = true;
2328 } else {
2329 bool not_auth_yet = false;
2330
2331 mutex_unlock(&ifmgd->mtx);
2332
2333 mutex_lock(&local->mtx);
2334 list_for_each_entry(wk, &local->work_list, list) {
2335 if (wk->sdata != sdata)
2336 continue;
2337
2338 if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2339 wk->type != IEEE80211_WORK_AUTH &&
2340 wk->type != IEEE80211_WORK_ASSOC &&
2341 wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2342 continue;
2343
2344 if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2345 continue;
2346
2347 not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2348 list_del_rcu(&wk->list);
2349 free_work(wk);
2350 break;
2351 }
2352 mutex_unlock(&local->mtx);
2353
2354 /*
2355 * If somebody requests authentication and we haven't
2356 * sent out an auth frame yet there's no need to send
2357 * out a deauth frame either. If the state was PROBE,
2358 * then this is the case. If it's AUTH we have sent a
2359 * frame, and if it's IDLE we have completed the auth
2360 * process already.
2361 */
2362 if (not_auth_yet) {
2363 __cfg80211_auth_canceled(sdata->dev, bssid);
2364 return 0;
2365 }
2366 }
2367
2368 printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2369 sdata->name, bssid, req->reason_code);
2370
2371 ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2372 req->reason_code, cookie,
2373 !req->local_state_change);
2374 if (assoc_bss)
2375 sta_info_destroy_addr(sdata, bssid);
2376
2377 mutex_lock(&sdata->local->mtx);
2378 ieee80211_recalc_idle(sdata->local);
2379 mutex_unlock(&sdata->local->mtx);
2380
2381 return 0;
2382 }
2383
2384 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2385 struct cfg80211_disassoc_request *req,
2386 void *cookie)
2387 {
2388 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2389 u8 bssid[ETH_ALEN];
2390
2391 mutex_lock(&ifmgd->mtx);
2392
2393 /*
2394 * cfg80211 should catch this ... but it's racy since
2395 * we can receive a disassoc frame, process it, hand it
2396 * to cfg80211 while that's in a locked section already
2397 * trying to tell us that the user wants to disconnect.
2398 */
2399 if (ifmgd->associated != req->bss) {
2400 mutex_unlock(&ifmgd->mtx);
2401 return -ENOLINK;
2402 }
2403
2404 printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2405 sdata->name, req->bss->bssid, req->reason_code);
2406
2407 memcpy(bssid, req->bss->bssid, ETH_ALEN);
2408 ieee80211_set_disassoc(sdata, false, true);
2409
2410 mutex_unlock(&ifmgd->mtx);
2411
2412 ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2413 IEEE80211_STYPE_DISASSOC, req->reason_code,
2414 cookie, !req->local_state_change);
2415 sta_info_destroy_addr(sdata, bssid);
2416
2417 mutex_lock(&sdata->local->mtx);
2418 ieee80211_recalc_idle(sdata->local);
2419 mutex_unlock(&sdata->local->mtx);
2420
2421 return 0;
2422 }
2423
2424 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2425 enum nl80211_cqm_rssi_threshold_event rssi_event,
2426 gfp_t gfp)
2427 {
2428 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2429
2430 trace_api_cqm_rssi_notify(sdata, rssi_event);
2431
2432 cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2433 }
2434 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
linux-next