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