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Linux/net/mac80211/mlme.c

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  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  * Copyright 2013-2014  Intel Mobile Communications GmbH
  9  * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
 10  * Copyright (C) 2018        Intel Corporation
 11  *
 12  * This program is free software; you can redistribute it and/or modify
 13  * it under the terms of the GNU General Public License version 2 as
 14  * published by the Free Software Foundation.
 15  */
 16 
 17 #include <linux/delay.h>
 18 #include <linux/if_ether.h>
 19 #include <linux/skbuff.h>
 20 #include <linux/if_arp.h>
 21 #include <linux/etherdevice.h>
 22 #include <linux/moduleparam.h>
 23 #include <linux/rtnetlink.h>
 24 #include <linux/crc32.h>
 25 #include <linux/slab.h>
 26 #include <linux/export.h>
 27 #include <net/mac80211.h>
 28 #include <asm/unaligned.h>
 29 
 30 #include "ieee80211_i.h"
 31 #include "driver-ops.h"
 32 #include "rate.h"
 33 #include "led.h"
 34 #include "fils_aead.h"
 35 
 36 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
 37 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
 38 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
 39 #define IEEE80211_AUTH_TIMEOUT_SAE      (HZ * 2)
 40 #define IEEE80211_AUTH_MAX_TRIES        3
 41 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
 42 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
 43 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
 44 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
 45 #define IEEE80211_ASSOC_MAX_TRIES       3
 46 
 47 static int max_nullfunc_tries = 2;
 48 module_param(max_nullfunc_tries, int, 0644);
 49 MODULE_PARM_DESC(max_nullfunc_tries,
 50                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
 51 
 52 static int max_probe_tries = 5;
 53 module_param(max_probe_tries, int, 0644);
 54 MODULE_PARM_DESC(max_probe_tries,
 55                  "Maximum probe tries before disconnecting (reason 4).");
 56 
 57 /*
 58  * Beacon loss timeout is calculated as N frames times the
 59  * advertised beacon interval.  This may need to be somewhat
 60  * higher than what hardware might detect to account for
 61  * delays in the host processing frames. But since we also
 62  * probe on beacon miss before declaring the connection lost
 63  * default to what we want.
 64  */
 65 static int beacon_loss_count = 7;
 66 module_param(beacon_loss_count, int, 0644);
 67 MODULE_PARM_DESC(beacon_loss_count,
 68                  "Number of beacon intervals before we decide beacon was lost.");
 69 
 70 /*
 71  * Time the connection can be idle before we probe
 72  * it to see if we can still talk to the AP.
 73  */
 74 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
 75 /*
 76  * Time we wait for a probe response after sending
 77  * a probe request because of beacon loss or for
 78  * checking the connection still works.
 79  */
 80 static int probe_wait_ms = 500;
 81 module_param(probe_wait_ms, int, 0644);
 82 MODULE_PARM_DESC(probe_wait_ms,
 83                  "Maximum time(ms) to wait for probe response"
 84                  " before disconnecting (reason 4).");
 85 
 86 /*
 87  * How many Beacon frames need to have been used in average signal strength
 88  * before starting to indicate signal change events.
 89  */
 90 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
 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_sub_if_data *sdata,
103                       unsigned long timeout)
104 {
105         sdata_assert_lock(sdata);
106 
107         if (!timer_pending(&sdata->u.mgd.timer) ||
108             time_before(timeout, sdata->u.mgd.timer.expires))
109                 mod_timer(&sdata->u.mgd.timer, timeout);
110 }
111 
112 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
113 {
114         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
115                 return;
116 
117         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
118                 return;
119 
120         mod_timer(&sdata->u.mgd.bcn_mon_timer,
121                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
122 }
123 
124 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
125 {
126         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
127 
128         if (unlikely(!ifmgd->associated))
129                 return;
130 
131         if (ifmgd->probe_send_count)
132                 ifmgd->probe_send_count = 0;
133 
134         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
135                 return;
136 
137         mod_timer(&ifmgd->conn_mon_timer,
138                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
139 }
140 
141 static int ecw2cw(int ecw)
142 {
143         return (1 << ecw) - 1;
144 }
145 
146 static u32
147 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
148                              struct ieee80211_supported_band *sband,
149                              struct ieee80211_channel *channel,
150                              const struct ieee80211_ht_operation *ht_oper,
151                              const struct ieee80211_vht_operation *vht_oper,
152                              struct cfg80211_chan_def *chandef, bool tracking)
153 {
154         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
155         struct cfg80211_chan_def vht_chandef;
156         struct ieee80211_sta_ht_cap sta_ht_cap;
157         u32 ht_cfreq, ret;
158 
159         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
160         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
161 
162         chandef->chan = channel;
163         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
164         chandef->center_freq1 = channel->center_freq;
165         chandef->center_freq2 = 0;
166 
167         if (!ht_oper || !sta_ht_cap.ht_supported) {
168                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
169                 goto out;
170         }
171 
172         chandef->width = NL80211_CHAN_WIDTH_20;
173 
174         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
175                                                   channel->band);
176         /* check that channel matches the right operating channel */
177         if (!tracking && channel->center_freq != ht_cfreq) {
178                 /*
179                  * It's possible that some APs are confused here;
180                  * Netgear WNDR3700 sometimes reports 4 higher than
181                  * the actual channel in association responses, but
182                  * since we look at probe response/beacon data here
183                  * it should be OK.
184                  */
185                 sdata_info(sdata,
186                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
187                            channel->center_freq, ht_cfreq,
188                            ht_oper->primary_chan, channel->band);
189                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
190                 goto out;
191         }
192 
193         /* check 40 MHz support, if we have it */
194         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
195                 ieee80211_chandef_ht_oper(ht_oper, chandef);
196         } else {
197                 /* 40 MHz (and 80 MHz) must be supported for VHT */
198                 ret = IEEE80211_STA_DISABLE_VHT;
199                 /* also mark 40 MHz disabled */
200                 ret |= IEEE80211_STA_DISABLE_40MHZ;
201                 goto out;
202         }
203 
204         if (!vht_oper || !sband->vht_cap.vht_supported) {
205                 ret = IEEE80211_STA_DISABLE_VHT;
206                 goto out;
207         }
208 
209         vht_chandef = *chandef;
210         if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
211                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
212                         sdata_info(sdata,
213                                    "AP VHT information is invalid, disable VHT\n");
214                 ret = IEEE80211_STA_DISABLE_VHT;
215                 goto out;
216         }
217 
218         if (!cfg80211_chandef_valid(&vht_chandef)) {
219                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
220                         sdata_info(sdata,
221                                    "AP VHT information is invalid, disable VHT\n");
222                 ret = IEEE80211_STA_DISABLE_VHT;
223                 goto out;
224         }
225 
226         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
227                 ret = 0;
228                 goto out;
229         }
230 
231         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
232                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
233                         sdata_info(sdata,
234                                    "AP VHT information doesn't match HT, disable VHT\n");
235                 ret = IEEE80211_STA_DISABLE_VHT;
236                 goto out;
237         }
238 
239         *chandef = vht_chandef;
240 
241         ret = 0;
242 
243 out:
244         /*
245          * When tracking the current AP, don't do any further checks if the
246          * new chandef is identical to the one we're currently using for the
247          * connection. This keeps us from playing ping-pong with regulatory,
248          * without it the following can happen (for example):
249          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
250          *  - AP advertises regdom US
251          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
252          *  - the code below detects an unsupported channel, downgrades, and
253          *    we disconnect from the AP in the caller
254          *  - disconnect causes CRDA to reload world regdomain and the game
255          *    starts anew.
256          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
257          *
258          * It seems possible that there are still scenarios with CSA or real
259          * bandwidth changes where a this could happen, but those cases are
260          * less common and wouldn't completely prevent using the AP.
261          */
262         if (tracking &&
263             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
264                 return ret;
265 
266         /* don't print the message below for VHT mismatch if VHT is disabled */
267         if (ret & IEEE80211_STA_DISABLE_VHT)
268                 vht_chandef = *chandef;
269 
270         /*
271          * Ignore the DISABLED flag when we're already connected and only
272          * tracking the APs beacon for bandwidth changes - otherwise we
273          * might get disconnected here if we connect to an AP, update our
274          * regulatory information based on the AP's country IE and the
275          * information we have is wrong/outdated and disables the channel
276          * that we're actually using for the connection to the AP.
277          */
278         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
279                                         tracking ? 0 :
280                                                    IEEE80211_CHAN_DISABLED)) {
281                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
282                         ret = IEEE80211_STA_DISABLE_HT |
283                               IEEE80211_STA_DISABLE_VHT;
284                         break;
285                 }
286 
287                 ret |= ieee80211_chandef_downgrade(chandef);
288         }
289 
290         if (chandef->width != vht_chandef.width && !tracking)
291                 sdata_info(sdata,
292                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
293 
294         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
295         return ret;
296 }
297 
298 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
299                                struct sta_info *sta,
300                                const struct ieee80211_ht_cap *ht_cap,
301                                const struct ieee80211_ht_operation *ht_oper,
302                                const struct ieee80211_vht_operation *vht_oper,
303                                const u8 *bssid, u32 *changed)
304 {
305         struct ieee80211_local *local = sdata->local;
306         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
307         struct ieee80211_supported_band *sband;
308         struct ieee80211_channel *chan;
309         struct cfg80211_chan_def chandef;
310         u16 ht_opmode;
311         u32 flags;
312         enum ieee80211_sta_rx_bandwidth new_sta_bw;
313         int ret;
314 
315         /* if HT was/is disabled, don't track any bandwidth changes */
316         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
317                 return 0;
318 
319         /* don't check VHT if we associated as non-VHT station */
320         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
321                 vht_oper = NULL;
322 
323         if (WARN_ON_ONCE(!sta))
324                 return -EINVAL;
325 
326         /*
327          * if bss configuration changed store the new one -
328          * this may be applicable even if channel is identical
329          */
330         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
331         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
332                 *changed |= BSS_CHANGED_HT;
333                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
334         }
335 
336         chan = sdata->vif.bss_conf.chandef.chan;
337         sband = local->hw.wiphy->bands[chan->band];
338 
339         /* calculate new channel (type) based on HT/VHT operation IEs */
340         flags = ieee80211_determine_chantype(sdata, sband, chan,
341                                              ht_oper, vht_oper,
342                                              &chandef, true);
343 
344         /*
345          * Downgrade the new channel if we associated with restricted
346          * capabilities. For example, if we associated as a 20 MHz STA
347          * to a 40 MHz AP (due to regulatory, capabilities or config
348          * reasons) then switching to a 40 MHz channel now won't do us
349          * any good -- we couldn't use it with the AP.
350          */
351         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
352             chandef.width == NL80211_CHAN_WIDTH_80P80)
353                 flags |= ieee80211_chandef_downgrade(&chandef);
354         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
355             chandef.width == NL80211_CHAN_WIDTH_160)
356                 flags |= ieee80211_chandef_downgrade(&chandef);
357         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
358             chandef.width > NL80211_CHAN_WIDTH_20)
359                 flags |= ieee80211_chandef_downgrade(&chandef);
360 
361         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
362                 return 0;
363 
364         sdata_info(sdata,
365                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
366                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
367                    chandef.center_freq1, chandef.center_freq2);
368 
369         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
370                                       IEEE80211_STA_DISABLE_VHT |
371                                       IEEE80211_STA_DISABLE_40MHZ |
372                                       IEEE80211_STA_DISABLE_80P80MHZ |
373                                       IEEE80211_STA_DISABLE_160MHZ)) ||
374             !cfg80211_chandef_valid(&chandef)) {
375                 sdata_info(sdata,
376                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
377                            ifmgd->bssid);
378                 return -EINVAL;
379         }
380 
381         switch (chandef.width) {
382         case NL80211_CHAN_WIDTH_20_NOHT:
383         case NL80211_CHAN_WIDTH_20:
384                 new_sta_bw = IEEE80211_STA_RX_BW_20;
385                 break;
386         case NL80211_CHAN_WIDTH_40:
387                 new_sta_bw = IEEE80211_STA_RX_BW_40;
388                 break;
389         case NL80211_CHAN_WIDTH_80:
390                 new_sta_bw = IEEE80211_STA_RX_BW_80;
391                 break;
392         case NL80211_CHAN_WIDTH_80P80:
393         case NL80211_CHAN_WIDTH_160:
394                 new_sta_bw = IEEE80211_STA_RX_BW_160;
395                 break;
396         default:
397                 return -EINVAL;
398         }
399 
400         if (new_sta_bw > sta->cur_max_bandwidth)
401                 new_sta_bw = sta->cur_max_bandwidth;
402 
403         if (new_sta_bw < sta->sta.bandwidth) {
404                 sta->sta.bandwidth = new_sta_bw;
405                 rate_control_rate_update(local, sband, sta,
406                                          IEEE80211_RC_BW_CHANGED);
407         }
408 
409         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
410         if (ret) {
411                 sdata_info(sdata,
412                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
413                            ifmgd->bssid);
414                 return ret;
415         }
416 
417         if (new_sta_bw > sta->sta.bandwidth) {
418                 sta->sta.bandwidth = new_sta_bw;
419                 rate_control_rate_update(local, sband, sta,
420                                          IEEE80211_RC_BW_CHANGED);
421         }
422 
423         return 0;
424 }
425 
426 /* frame sending functions */
427 
428 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
429                                 struct sk_buff *skb, u8 ap_ht_param,
430                                 struct ieee80211_supported_band *sband,
431                                 struct ieee80211_channel *channel,
432                                 enum ieee80211_smps_mode smps)
433 {
434         u8 *pos;
435         u32 flags = channel->flags;
436         u16 cap;
437         struct ieee80211_sta_ht_cap ht_cap;
438 
439         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
440 
441         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
442         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
443 
444         /* determine capability flags */
445         cap = ht_cap.cap;
446 
447         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
448         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
449                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
450                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
451                         cap &= ~IEEE80211_HT_CAP_SGI_40;
452                 }
453                 break;
454         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
455                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
456                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
457                         cap &= ~IEEE80211_HT_CAP_SGI_40;
458                 }
459                 break;
460         }
461 
462         /*
463          * If 40 MHz was disabled associate as though we weren't
464          * capable of 40 MHz -- some broken APs will never fall
465          * back to trying to transmit in 20 MHz.
466          */
467         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
468                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
469                 cap &= ~IEEE80211_HT_CAP_SGI_40;
470         }
471 
472         /* set SM PS mode properly */
473         cap &= ~IEEE80211_HT_CAP_SM_PS;
474         switch (smps) {
475         case IEEE80211_SMPS_AUTOMATIC:
476         case IEEE80211_SMPS_NUM_MODES:
477                 WARN_ON(1);
478                 /* fall through */
479         case IEEE80211_SMPS_OFF:
480                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
481                         IEEE80211_HT_CAP_SM_PS_SHIFT;
482                 break;
483         case IEEE80211_SMPS_STATIC:
484                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
485                         IEEE80211_HT_CAP_SM_PS_SHIFT;
486                 break;
487         case IEEE80211_SMPS_DYNAMIC:
488                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
489                         IEEE80211_HT_CAP_SM_PS_SHIFT;
490                 break;
491         }
492 
493         /* reserve and fill IE */
494         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
495         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
496 }
497 
498 /* This function determines vht capability flags for the association
499  * and builds the IE.
500  * Note - the function may set the owner of the MU-MIMO capability
501  */
502 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
503                                  struct sk_buff *skb,
504                                  struct ieee80211_supported_band *sband,
505                                  struct ieee80211_vht_cap *ap_vht_cap)
506 {
507         struct ieee80211_local *local = sdata->local;
508         u8 *pos;
509         u32 cap;
510         struct ieee80211_sta_vht_cap vht_cap;
511         u32 mask, ap_bf_sts, our_bf_sts;
512 
513         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
514 
515         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
516         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
517 
518         /* determine capability flags */
519         cap = vht_cap.cap;
520 
521         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
522                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
523 
524                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
525                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
526                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
527                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
528         }
529 
530         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
531                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
532                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
533         }
534 
535         /*
536          * Some APs apparently get confused if our capabilities are better
537          * than theirs, so restrict what we advertise in the assoc request.
538          */
539         if (!(ap_vht_cap->vht_cap_info &
540                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
541                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
542                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
543         else if (!(ap_vht_cap->vht_cap_info &
544                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
545                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
546 
547         /*
548          * If some other vif is using the MU-MIMO capablity we cannot associate
549          * using MU-MIMO - this will lead to contradictions in the group-id
550          * mechanism.
551          * Ownership is defined since association request, in order to avoid
552          * simultaneous associations with MU-MIMO.
553          */
554         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
555                 bool disable_mu_mimo = false;
556                 struct ieee80211_sub_if_data *other;
557 
558                 list_for_each_entry_rcu(other, &local->interfaces, list) {
559                         if (other->vif.mu_mimo_owner) {
560                                 disable_mu_mimo = true;
561                                 break;
562                         }
563                 }
564                 if (disable_mu_mimo)
565                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
566                 else
567                         sdata->vif.mu_mimo_owner = true;
568         }
569 
570         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
571 
572         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
573         our_bf_sts = cap & mask;
574 
575         if (ap_bf_sts < our_bf_sts) {
576                 cap &= ~mask;
577                 cap |= ap_bf_sts;
578         }
579 
580         /* reserve and fill IE */
581         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
582         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
583 }
584 
585 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
586 {
587         struct ieee80211_local *local = sdata->local;
588         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
589         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
590         struct sk_buff *skb;
591         struct ieee80211_mgmt *mgmt;
592         u8 *pos, qos_info;
593         size_t offset = 0, noffset;
594         int i, count, rates_len, supp_rates_len, shift;
595         u16 capab;
596         struct ieee80211_supported_band *sband;
597         struct ieee80211_chanctx_conf *chanctx_conf;
598         struct ieee80211_channel *chan;
599         u32 rates = 0;
600 
601         sdata_assert_lock(sdata);
602 
603         rcu_read_lock();
604         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
605         if (WARN_ON(!chanctx_conf)) {
606                 rcu_read_unlock();
607                 return;
608         }
609         chan = chanctx_conf->def.chan;
610         rcu_read_unlock();
611         sband = local->hw.wiphy->bands[chan->band];
612         shift = ieee80211_vif_get_shift(&sdata->vif);
613 
614         if (assoc_data->supp_rates_len) {
615                 /*
616                  * Get all rates supported by the device and the AP as
617                  * some APs don't like getting a superset of their rates
618                  * in the association request (e.g. D-Link DAP 1353 in
619                  * b-only mode)...
620                  */
621                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
622                                                      assoc_data->supp_rates,
623                                                      assoc_data->supp_rates_len,
624                                                      &rates);
625         } else {
626                 /*
627                  * In case AP not provide any supported rates information
628                  * before association, we send information element(s) with
629                  * all rates that we support.
630                  */
631                 rates_len = 0;
632                 for (i = 0; i < sband->n_bitrates; i++) {
633                         rates |= BIT(i);
634                         rates_len++;
635                 }
636         }
637 
638         skb = alloc_skb(local->hw.extra_tx_headroom +
639                         sizeof(*mgmt) + /* bit too much but doesn't matter */
640                         2 + assoc_data->ssid_len + /* SSID */
641                         4 + rates_len + /* (extended) rates */
642                         4 + /* power capability */
643                         2 + 2 * sband->n_channels + /* supported channels */
644                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
645                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
646                         assoc_data->ie_len + /* extra IEs */
647                         (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
648                         9, /* WMM */
649                         GFP_KERNEL);
650         if (!skb)
651                 return;
652 
653         skb_reserve(skb, local->hw.extra_tx_headroom);
654 
655         capab = WLAN_CAPABILITY_ESS;
656 
657         if (sband->band == NL80211_BAND_2GHZ) {
658                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
659                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
660         }
661 
662         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
663                 capab |= WLAN_CAPABILITY_PRIVACY;
664 
665         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
666             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
667                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
668 
669         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
670                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
671 
672         mgmt = skb_put_zero(skb, 24);
673         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
674         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
675         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
676 
677         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
678                 skb_put(skb, 10);
679                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
680                                                   IEEE80211_STYPE_REASSOC_REQ);
681                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
682                 mgmt->u.reassoc_req.listen_interval =
683                                 cpu_to_le16(local->hw.conf.listen_interval);
684                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
685                        ETH_ALEN);
686         } else {
687                 skb_put(skb, 4);
688                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
689                                                   IEEE80211_STYPE_ASSOC_REQ);
690                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
691                 mgmt->u.assoc_req.listen_interval =
692                                 cpu_to_le16(local->hw.conf.listen_interval);
693         }
694 
695         /* SSID */
696         pos = skb_put(skb, 2 + assoc_data->ssid_len);
697         *pos++ = WLAN_EID_SSID;
698         *pos++ = assoc_data->ssid_len;
699         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
700 
701         /* add all rates which were marked to be used above */
702         supp_rates_len = rates_len;
703         if (supp_rates_len > 8)
704                 supp_rates_len = 8;
705 
706         pos = skb_put(skb, supp_rates_len + 2);
707         *pos++ = WLAN_EID_SUPP_RATES;
708         *pos++ = supp_rates_len;
709 
710         count = 0;
711         for (i = 0; i < sband->n_bitrates; i++) {
712                 if (BIT(i) & rates) {
713                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
714                                                 5 * (1 << shift));
715                         *pos++ = (u8) rate;
716                         if (++count == 8)
717                                 break;
718                 }
719         }
720 
721         if (rates_len > count) {
722                 pos = skb_put(skb, rates_len - count + 2);
723                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
724                 *pos++ = rates_len - count;
725 
726                 for (i++; i < sband->n_bitrates; i++) {
727                         if (BIT(i) & rates) {
728                                 int rate;
729                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
730                                                     5 * (1 << shift));
731                                 *pos++ = (u8) rate;
732                         }
733                 }
734         }
735 
736         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
737             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
738                 pos = skb_put(skb, 4);
739                 *pos++ = WLAN_EID_PWR_CAPABILITY;
740                 *pos++ = 2;
741                 *pos++ = 0; /* min tx power */
742                  /* max tx power */
743                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
744         }
745 
746         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
747                 /* TODO: get this in reg domain format */
748                 pos = skb_put(skb, 2 * sband->n_channels + 2);
749                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
750                 *pos++ = 2 * sband->n_channels;
751                 for (i = 0; i < sband->n_channels; i++) {
752                         *pos++ = ieee80211_frequency_to_channel(
753                                         sband->channels[i].center_freq);
754                         *pos++ = 1; /* one channel in the subband*/
755                 }
756         }
757 
758         /* if present, add any custom IEs that go before HT */
759         if (assoc_data->ie_len) {
760                 static const u8 before_ht[] = {
761                         WLAN_EID_SSID,
762                         WLAN_EID_SUPP_RATES,
763                         WLAN_EID_EXT_SUPP_RATES,
764                         WLAN_EID_PWR_CAPABILITY,
765                         WLAN_EID_SUPPORTED_CHANNELS,
766                         WLAN_EID_RSN,
767                         WLAN_EID_QOS_CAPA,
768                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
769                         WLAN_EID_MOBILITY_DOMAIN,
770                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
771                         WLAN_EID_RIC_DATA,              /* reassoc only */
772                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
773                 };
774                 static const u8 after_ric[] = {
775                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
776                         WLAN_EID_HT_CAPABILITY,
777                         WLAN_EID_BSS_COEX_2040,
778                         /* luckily this is almost always there */
779                         WLAN_EID_EXT_CAPABILITY,
780                         WLAN_EID_QOS_TRAFFIC_CAPA,
781                         WLAN_EID_TIM_BCAST_REQ,
782                         WLAN_EID_INTERWORKING,
783                         /* 60 GHz (Multi-band, DMG, MMS) can't happen */
784                         WLAN_EID_VHT_CAPABILITY,
785                         WLAN_EID_OPMODE_NOTIF,
786                 };
787 
788                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
789                                                  assoc_data->ie_len,
790                                                  before_ht,
791                                                  ARRAY_SIZE(before_ht),
792                                                  after_ric,
793                                                  ARRAY_SIZE(after_ric),
794                                                  offset);
795                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
796                 offset = noffset;
797         }
798 
799         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
800                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
801                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
802 
803         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
804                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
805                                     sband, chan, sdata->smps_mode);
806 
807         /* if present, add any custom IEs that go before VHT */
808         if (assoc_data->ie_len) {
809                 static const u8 before_vht[] = {
810                         /*
811                          * no need to list the ones split off before HT
812                          * or generated here
813                          */
814                         WLAN_EID_BSS_COEX_2040,
815                         WLAN_EID_EXT_CAPABILITY,
816                         WLAN_EID_QOS_TRAFFIC_CAPA,
817                         WLAN_EID_TIM_BCAST_REQ,
818                         WLAN_EID_INTERWORKING,
819                         /* 60 GHz (Multi-band, DMG, MMS) can't happen */
820                 };
821 
822                 /* RIC already taken above, so no need to handle here anymore */
823                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
824                                              before_vht, ARRAY_SIZE(before_vht),
825                                              offset);
826                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
827                 offset = noffset;
828         }
829 
830         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
831                 ieee80211_add_vht_ie(sdata, skb, sband,
832                                      &assoc_data->ap_vht_cap);
833 
834         /* if present, add any custom non-vendor IEs that go after HT */
835         if (assoc_data->ie_len) {
836                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
837                                                     assoc_data->ie_len,
838                                                     offset);
839                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
840                 offset = noffset;
841         }
842 
843         if (assoc_data->wmm) {
844                 if (assoc_data->uapsd) {
845                         qos_info = ifmgd->uapsd_queues;
846                         qos_info |= (ifmgd->uapsd_max_sp_len <<
847                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
848                 } else {
849                         qos_info = 0;
850                 }
851 
852                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
853         }
854 
855         /* add any remaining custom (i.e. vendor specific here) IEs */
856         if (assoc_data->ie_len) {
857                 noffset = assoc_data->ie_len;
858                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
859         }
860 
861         if (assoc_data->fils_kek_len &&
862             fils_encrypt_assoc_req(skb, assoc_data) < 0) {
863                 dev_kfree_skb(skb);
864                 return;
865         }
866 
867         drv_mgd_prepare_tx(local, sdata);
868 
869         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
870         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
871                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
872                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
873         ieee80211_tx_skb(sdata, skb);
874 }
875 
876 void ieee80211_send_pspoll(struct ieee80211_local *local,
877                            struct ieee80211_sub_if_data *sdata)
878 {
879         struct ieee80211_pspoll *pspoll;
880         struct sk_buff *skb;
881 
882         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
883         if (!skb)
884                 return;
885 
886         pspoll = (struct ieee80211_pspoll *) skb->data;
887         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
888 
889         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
890         ieee80211_tx_skb(sdata, skb);
891 }
892 
893 void ieee80211_send_nullfunc(struct ieee80211_local *local,
894                              struct ieee80211_sub_if_data *sdata,
895                              bool powersave)
896 {
897         struct sk_buff *skb;
898         struct ieee80211_hdr_3addr *nullfunc;
899         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
900 
901         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif,
902                 !ieee80211_hw_check(&local->hw, DOESNT_SUPPORT_QOS_NDP));
903         if (!skb)
904                 return;
905 
906         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
907         if (powersave)
908                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
909 
910         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
911                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
912 
913         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
914                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
915 
916         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
917                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
918 
919         ieee80211_tx_skb(sdata, skb);
920 }
921 
922 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
923                                           struct ieee80211_sub_if_data *sdata)
924 {
925         struct sk_buff *skb;
926         struct ieee80211_hdr *nullfunc;
927         __le16 fc;
928 
929         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
930                 return;
931 
932         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
933         if (!skb)
934                 return;
935 
936         skb_reserve(skb, local->hw.extra_tx_headroom);
937 
938         nullfunc = skb_put_zero(skb, 30);
939         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
940                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
941         nullfunc->frame_control = fc;
942         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
943         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
944         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
945         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
946 
947         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
948         ieee80211_tx_skb(sdata, skb);
949 }
950 
951 /* spectrum management related things */
952 static void ieee80211_chswitch_work(struct work_struct *work)
953 {
954         struct ieee80211_sub_if_data *sdata =
955                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
956         struct ieee80211_local *local = sdata->local;
957         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
958         int ret;
959 
960         if (!ieee80211_sdata_running(sdata))
961                 return;
962 
963         sdata_lock(sdata);
964         mutex_lock(&local->mtx);
965         mutex_lock(&local->chanctx_mtx);
966 
967         if (!ifmgd->associated)
968                 goto out;
969 
970         if (!sdata->vif.csa_active)
971                 goto out;
972 
973         /*
974          * using reservation isn't immediate as it may be deferred until later
975          * with multi-vif. once reservation is complete it will re-schedule the
976          * work with no reserved_chanctx so verify chandef to check if it
977          * completed successfully
978          */
979 
980         if (sdata->reserved_chanctx) {
981                 /*
982                  * with multi-vif csa driver may call ieee80211_csa_finish()
983                  * many times while waiting for other interfaces to use their
984                  * reservations
985                  */
986                 if (sdata->reserved_ready)
987                         goto out;
988 
989                 ret = ieee80211_vif_use_reserved_context(sdata);
990                 if (ret) {
991                         sdata_info(sdata,
992                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
993                                    ret);
994                         ieee80211_queue_work(&sdata->local->hw,
995                                              &ifmgd->csa_connection_drop_work);
996                         goto out;
997                 }
998 
999                 goto out;
1000         }
1001 
1002         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1003                                         &sdata->csa_chandef)) {
1004                 sdata_info(sdata,
1005                            "failed to finalize channel switch, disconnecting\n");
1006                 ieee80211_queue_work(&sdata->local->hw,
1007                                      &ifmgd->csa_connection_drop_work);
1008                 goto out;
1009         }
1010 
1011         /* XXX: shouldn't really modify cfg80211-owned data! */
1012         ifmgd->associated->channel = sdata->csa_chandef.chan;
1013 
1014         ifmgd->csa_waiting_bcn = true;
1015 
1016         ieee80211_sta_reset_beacon_monitor(sdata);
1017         ieee80211_sta_reset_conn_monitor(sdata);
1018 
1019 out:
1020         mutex_unlock(&local->chanctx_mtx);
1021         mutex_unlock(&local->mtx);
1022         sdata_unlock(sdata);
1023 }
1024 
1025 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1026 {
1027         struct ieee80211_local *local = sdata->local;
1028         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1029         int ret;
1030 
1031         sdata_assert_lock(sdata);
1032 
1033         WARN_ON(!sdata->vif.csa_active);
1034 
1035         if (sdata->csa_block_tx) {
1036                 ieee80211_wake_vif_queues(local, sdata,
1037                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1038                 sdata->csa_block_tx = false;
1039         }
1040 
1041         sdata->vif.csa_active = false;
1042         ifmgd->csa_waiting_bcn = false;
1043 
1044         ret = drv_post_channel_switch(sdata);
1045         if (ret) {
1046                 sdata_info(sdata,
1047                            "driver post channel switch failed, disconnecting\n");
1048                 ieee80211_queue_work(&local->hw,
1049                                      &ifmgd->csa_connection_drop_work);
1050                 return;
1051         }
1052 
1053         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1054 }
1055 
1056 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1057 {
1058         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1059         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1060 
1061         trace_api_chswitch_done(sdata, success);
1062         if (!success) {
1063                 sdata_info(sdata,
1064                            "driver channel switch failed, disconnecting\n");
1065                 ieee80211_queue_work(&sdata->local->hw,
1066                                      &ifmgd->csa_connection_drop_work);
1067         } else {
1068                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1069         }
1070 }
1071 EXPORT_SYMBOL(ieee80211_chswitch_done);
1072 
1073 static void ieee80211_chswitch_timer(struct timer_list *t)
1074 {
1075         struct ieee80211_sub_if_data *sdata =
1076                 from_timer(sdata, t, u.mgd.chswitch_timer);
1077 
1078         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1079 }
1080 
1081 static void
1082 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1083                                  u64 timestamp, u32 device_timestamp,
1084                                  struct ieee802_11_elems *elems,
1085                                  bool beacon)
1086 {
1087         struct ieee80211_local *local = sdata->local;
1088         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1089         struct cfg80211_bss *cbss = ifmgd->associated;
1090         struct ieee80211_chanctx_conf *conf;
1091         struct ieee80211_chanctx *chanctx;
1092         enum nl80211_band current_band;
1093         struct ieee80211_csa_ie csa_ie;
1094         struct ieee80211_channel_switch ch_switch;
1095         int res;
1096 
1097         sdata_assert_lock(sdata);
1098 
1099         if (!cbss)
1100                 return;
1101 
1102         if (local->scanning)
1103                 return;
1104 
1105         /* disregard subsequent announcements if we are already processing */
1106         if (sdata->vif.csa_active)
1107                 return;
1108 
1109         current_band = cbss->channel->band;
1110         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1111                                            ifmgd->flags,
1112                                            ifmgd->associated->bssid, &csa_ie);
1113         if (res < 0)
1114                 ieee80211_queue_work(&local->hw,
1115                                      &ifmgd->csa_connection_drop_work);
1116         if (res)
1117                 return;
1118 
1119         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1120                                      IEEE80211_CHAN_DISABLED)) {
1121                 sdata_info(sdata,
1122                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1123                            ifmgd->associated->bssid,
1124                            csa_ie.chandef.chan->center_freq,
1125                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1126                            csa_ie.chandef.center_freq2);
1127                 ieee80211_queue_work(&local->hw,
1128                                      &ifmgd->csa_connection_drop_work);
1129                 return;
1130         }
1131 
1132         if (cfg80211_chandef_identical(&csa_ie.chandef,
1133                                        &sdata->vif.bss_conf.chandef)) {
1134                 if (ifmgd->csa_ignored_same_chan)
1135                         return;
1136                 sdata_info(sdata,
1137                            "AP %pM tries to chanswitch to same channel, ignore\n",
1138                            ifmgd->associated->bssid);
1139                 ifmgd->csa_ignored_same_chan = true;
1140                 return;
1141         }
1142 
1143         /*
1144          * Drop all TDLS peers - either we disconnect or move to a different
1145          * channel from this point on. There's no telling what our peer will do.
1146          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1147          * have an incompatible wider chandef.
1148          */
1149         ieee80211_teardown_tdls_peers(sdata);
1150 
1151         mutex_lock(&local->mtx);
1152         mutex_lock(&local->chanctx_mtx);
1153         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1154                                          lockdep_is_held(&local->chanctx_mtx));
1155         if (!conf) {
1156                 sdata_info(sdata,
1157                            "no channel context assigned to vif?, disconnecting\n");
1158                 goto drop_connection;
1159         }
1160 
1161         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1162 
1163         if (local->use_chanctx &&
1164             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1165                 sdata_info(sdata,
1166                            "driver doesn't support chan-switch with channel contexts\n");
1167                 goto drop_connection;
1168         }
1169 
1170         ch_switch.timestamp = timestamp;
1171         ch_switch.device_timestamp = device_timestamp;
1172         ch_switch.block_tx = csa_ie.mode;
1173         ch_switch.chandef = csa_ie.chandef;
1174         ch_switch.count = csa_ie.count;
1175 
1176         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1177                 sdata_info(sdata,
1178                            "preparing for channel switch failed, disconnecting\n");
1179                 goto drop_connection;
1180         }
1181 
1182         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1183                                             chanctx->mode, false);
1184         if (res) {
1185                 sdata_info(sdata,
1186                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1187                            res);
1188                 goto drop_connection;
1189         }
1190         mutex_unlock(&local->chanctx_mtx);
1191 
1192         sdata->vif.csa_active = true;
1193         sdata->csa_chandef = csa_ie.chandef;
1194         sdata->csa_block_tx = csa_ie.mode;
1195         ifmgd->csa_ignored_same_chan = false;
1196 
1197         if (sdata->csa_block_tx)
1198                 ieee80211_stop_vif_queues(local, sdata,
1199                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1200         mutex_unlock(&local->mtx);
1201 
1202         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1203                                           csa_ie.count);
1204 
1205         if (local->ops->channel_switch) {
1206                 /* use driver's channel switch callback */
1207                 drv_channel_switch(local, sdata, &ch_switch);
1208                 return;
1209         }
1210 
1211         /* channel switch handled in software */
1212         if (csa_ie.count <= 1)
1213                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1214         else
1215                 mod_timer(&ifmgd->chswitch_timer,
1216                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1217                                          cbss->beacon_interval));
1218         return;
1219  drop_connection:
1220         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1221         mutex_unlock(&local->chanctx_mtx);
1222         mutex_unlock(&local->mtx);
1223 }
1224 
1225 static bool
1226 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1227                                  struct ieee80211_channel *channel,
1228                                  const u8 *country_ie, u8 country_ie_len,
1229                                  const u8 *pwr_constr_elem,
1230                                  int *chan_pwr, int *pwr_reduction)
1231 {
1232         struct ieee80211_country_ie_triplet *triplet;
1233         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1234         int i, chan_increment;
1235         bool have_chan_pwr = false;
1236 
1237         /* Invalid IE */
1238         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1239                 return false;
1240 
1241         triplet = (void *)(country_ie + 3);
1242         country_ie_len -= 3;
1243 
1244         switch (channel->band) {
1245         default:
1246                 WARN_ON_ONCE(1);
1247                 /* fall through */
1248         case NL80211_BAND_2GHZ:
1249         case NL80211_BAND_60GHZ:
1250                 chan_increment = 1;
1251                 break;
1252         case NL80211_BAND_5GHZ:
1253                 chan_increment = 4;
1254                 break;
1255         }
1256 
1257         /* find channel */
1258         while (country_ie_len >= 3) {
1259                 u8 first_channel = triplet->chans.first_channel;
1260 
1261                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1262                         goto next;
1263 
1264                 for (i = 0; i < triplet->chans.num_channels; i++) {
1265                         if (first_channel + i * chan_increment == chan) {
1266                                 have_chan_pwr = true;
1267                                 *chan_pwr = triplet->chans.max_power;
1268                                 break;
1269                         }
1270                 }
1271                 if (have_chan_pwr)
1272                         break;
1273 
1274  next:
1275                 triplet++;
1276                 country_ie_len -= 3;
1277         }
1278 
1279         if (have_chan_pwr && pwr_constr_elem)
1280                 *pwr_reduction = *pwr_constr_elem;
1281         else
1282                 *pwr_reduction = 0;
1283 
1284         return have_chan_pwr;
1285 }
1286 
1287 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1288                                       struct ieee80211_channel *channel,
1289                                       const u8 *cisco_dtpc_ie,
1290                                       int *pwr_level)
1291 {
1292         /* From practical testing, the first data byte of the DTPC element
1293          * seems to contain the requested dBm level, and the CLI on Cisco
1294          * APs clearly state the range is -127 to 127 dBm, which indicates
1295          * a signed byte, although it seemingly never actually goes negative.
1296          * The other byte seems to always be zero.
1297          */
1298         *pwr_level = (__s8)cisco_dtpc_ie[4];
1299 }
1300 
1301 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1302                                        struct ieee80211_channel *channel,
1303                                        struct ieee80211_mgmt *mgmt,
1304                                        const u8 *country_ie, u8 country_ie_len,
1305                                        const u8 *pwr_constr_ie,
1306                                        const u8 *cisco_dtpc_ie)
1307 {
1308         bool has_80211h_pwr = false, has_cisco_pwr = false;
1309         int chan_pwr = 0, pwr_reduction_80211h = 0;
1310         int pwr_level_cisco, pwr_level_80211h;
1311         int new_ap_level;
1312         __le16 capab = mgmt->u.probe_resp.capab_info;
1313 
1314         if (country_ie &&
1315             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1316              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1317                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1318                         sdata, channel, country_ie, country_ie_len,
1319                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1320                 pwr_level_80211h =
1321                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1322         }
1323 
1324         if (cisco_dtpc_ie) {
1325                 ieee80211_find_cisco_dtpc(
1326                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1327                 has_cisco_pwr = true;
1328         }
1329 
1330         if (!has_80211h_pwr && !has_cisco_pwr)
1331                 return 0;
1332 
1333         /* If we have both 802.11h and Cisco DTPC, apply both limits
1334          * by picking the smallest of the two power levels advertised.
1335          */
1336         if (has_80211h_pwr &&
1337             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1338                 new_ap_level = pwr_level_80211h;
1339 
1340                 if (sdata->ap_power_level == new_ap_level)
1341                         return 0;
1342 
1343                 sdata_dbg(sdata,
1344                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1345                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1346                           sdata->u.mgd.bssid);
1347         } else {  /* has_cisco_pwr is always true here. */
1348                 new_ap_level = pwr_level_cisco;
1349 
1350                 if (sdata->ap_power_level == new_ap_level)
1351                         return 0;
1352 
1353                 sdata_dbg(sdata,
1354                           "Limiting TX power to %d dBm as advertised by %pM\n",
1355                           pwr_level_cisco, sdata->u.mgd.bssid);
1356         }
1357 
1358         sdata->ap_power_level = new_ap_level;
1359         if (__ieee80211_recalc_txpower(sdata))
1360                 return BSS_CHANGED_TXPOWER;
1361         return 0;
1362 }
1363 
1364 /* powersave */
1365 static void ieee80211_enable_ps(struct ieee80211_local *local,
1366                                 struct ieee80211_sub_if_data *sdata)
1367 {
1368         struct ieee80211_conf *conf = &local->hw.conf;
1369 
1370         /*
1371          * If we are scanning right now then the parameters will
1372          * take effect when scan finishes.
1373          */
1374         if (local->scanning)
1375                 return;
1376 
1377         if (conf->dynamic_ps_timeout > 0 &&
1378             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1379                 mod_timer(&local->dynamic_ps_timer, jiffies +
1380                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1381         } else {
1382                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1383                         ieee80211_send_nullfunc(local, sdata, true);
1384 
1385                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1386                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1387                         return;
1388 
1389                 conf->flags |= IEEE80211_CONF_PS;
1390                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1391         }
1392 }
1393 
1394 static void ieee80211_change_ps(struct ieee80211_local *local)
1395 {
1396         struct ieee80211_conf *conf = &local->hw.conf;
1397 
1398         if (local->ps_sdata) {
1399                 ieee80211_enable_ps(local, local->ps_sdata);
1400         } else if (conf->flags & IEEE80211_CONF_PS) {
1401                 conf->flags &= ~IEEE80211_CONF_PS;
1402                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1403                 del_timer_sync(&local->dynamic_ps_timer);
1404                 cancel_work_sync(&local->dynamic_ps_enable_work);
1405         }
1406 }
1407 
1408 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1409 {
1410         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1411         struct sta_info *sta = NULL;
1412         bool authorized = false;
1413 
1414         if (!mgd->powersave)
1415                 return false;
1416 
1417         if (mgd->broken_ap)
1418                 return false;
1419 
1420         if (!mgd->associated)
1421                 return false;
1422 
1423         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1424                 return false;
1425 
1426         if (!mgd->have_beacon)
1427                 return false;
1428 
1429         rcu_read_lock();
1430         sta = sta_info_get(sdata, mgd->bssid);
1431         if (sta)
1432                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1433         rcu_read_unlock();
1434 
1435         return authorized;
1436 }
1437 
1438 /* need to hold RTNL or interface lock */
1439 void ieee80211_recalc_ps(struct ieee80211_local *local)
1440 {
1441         struct ieee80211_sub_if_data *sdata, *found = NULL;
1442         int count = 0;
1443         int timeout;
1444 
1445         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1446                 local->ps_sdata = NULL;
1447                 return;
1448         }
1449 
1450         list_for_each_entry(sdata, &local->interfaces, list) {
1451                 if (!ieee80211_sdata_running(sdata))
1452                         continue;
1453                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1454                         /* If an AP vif is found, then disable PS
1455                          * by setting the count to zero thereby setting
1456                          * ps_sdata to NULL.
1457                          */
1458                         count = 0;
1459                         break;
1460                 }
1461                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1462                         continue;
1463                 found = sdata;
1464                 count++;
1465         }
1466 
1467         if (count == 1 && ieee80211_powersave_allowed(found)) {
1468                 u8 dtimper = found->u.mgd.dtim_period;
1469 
1470                 timeout = local->dynamic_ps_forced_timeout;
1471                 if (timeout < 0)
1472                         timeout = 100;
1473                 local->hw.conf.dynamic_ps_timeout = timeout;
1474 
1475                 /* If the TIM IE is invalid, pretend the value is 1 */
1476                 if (!dtimper)
1477                         dtimper = 1;
1478 
1479                 local->hw.conf.ps_dtim_period = dtimper;
1480                 local->ps_sdata = found;
1481         } else {
1482                 local->ps_sdata = NULL;
1483         }
1484 
1485         ieee80211_change_ps(local);
1486 }
1487 
1488 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1489 {
1490         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1491 
1492         if (sdata->vif.bss_conf.ps != ps_allowed) {
1493                 sdata->vif.bss_conf.ps = ps_allowed;
1494                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1495         }
1496 }
1497 
1498 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1499 {
1500         struct ieee80211_local *local =
1501                 container_of(work, struct ieee80211_local,
1502                              dynamic_ps_disable_work);
1503 
1504         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1505                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1506                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1507         }
1508 
1509         ieee80211_wake_queues_by_reason(&local->hw,
1510                                         IEEE80211_MAX_QUEUE_MAP,
1511                                         IEEE80211_QUEUE_STOP_REASON_PS,
1512                                         false);
1513 }
1514 
1515 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1516 {
1517         struct ieee80211_local *local =
1518                 container_of(work, struct ieee80211_local,
1519                              dynamic_ps_enable_work);
1520         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1521         struct ieee80211_if_managed *ifmgd;
1522         unsigned long flags;
1523         int q;
1524 
1525         /* can only happen when PS was just disabled anyway */
1526         if (!sdata)
1527                 return;
1528 
1529         ifmgd = &sdata->u.mgd;
1530 
1531         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1532                 return;
1533 
1534         if (local->hw.conf.dynamic_ps_timeout > 0) {
1535                 /* don't enter PS if TX frames are pending */
1536                 if (drv_tx_frames_pending(local)) {
1537                         mod_timer(&local->dynamic_ps_timer, jiffies +
1538                                   msecs_to_jiffies(
1539                                   local->hw.conf.dynamic_ps_timeout));
1540                         return;
1541                 }
1542 
1543                 /*
1544                  * transmission can be stopped by others which leads to
1545                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1546                  * is not the actual idle state.
1547                  */
1548                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1549                 for (q = 0; q < local->hw.queues; q++) {
1550                         if (local->queue_stop_reasons[q]) {
1551                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1552                                                        flags);
1553                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1554                                           msecs_to_jiffies(
1555                                           local->hw.conf.dynamic_ps_timeout));
1556                                 return;
1557                         }
1558                 }
1559                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1560         }
1561 
1562         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1563             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1564                 if (drv_tx_frames_pending(local)) {
1565                         mod_timer(&local->dynamic_ps_timer, jiffies +
1566                                   msecs_to_jiffies(
1567                                   local->hw.conf.dynamic_ps_timeout));
1568                 } else {
1569                         ieee80211_send_nullfunc(local, sdata, true);
1570                         /* Flush to get the tx status of nullfunc frame */
1571                         ieee80211_flush_queues(local, sdata, false);
1572                 }
1573         }
1574 
1575         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1576               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1577             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1578                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1579                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1580                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1581         }
1582 }
1583 
1584 void ieee80211_dynamic_ps_timer(struct timer_list *t)
1585 {
1586         struct ieee80211_local *local = from_timer(local, t, dynamic_ps_timer);
1587 
1588         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1589 }
1590 
1591 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1592 {
1593         struct delayed_work *delayed_work = to_delayed_work(work);
1594         struct ieee80211_sub_if_data *sdata =
1595                 container_of(delayed_work, struct ieee80211_sub_if_data,
1596                              dfs_cac_timer_work);
1597         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1598 
1599         mutex_lock(&sdata->local->mtx);
1600         if (sdata->wdev.cac_started) {
1601                 ieee80211_vif_release_channel(sdata);
1602                 cfg80211_cac_event(sdata->dev, &chandef,
1603                                    NL80211_RADAR_CAC_FINISHED,
1604                                    GFP_KERNEL);
1605         }
1606         mutex_unlock(&sdata->local->mtx);
1607 }
1608 
1609 static bool
1610 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1611 {
1612         struct ieee80211_local *local = sdata->local;
1613         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1614         bool ret = false;
1615         int ac;
1616 
1617         if (local->hw.queues < IEEE80211_NUM_ACS)
1618                 return false;
1619 
1620         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1621                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1622                 int non_acm_ac;
1623                 unsigned long now = jiffies;
1624 
1625                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1626                     tx_tspec->admitted_time &&
1627                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1628                         tx_tspec->consumed_tx_time = 0;
1629                         tx_tspec->time_slice_start = now;
1630 
1631                         if (tx_tspec->downgraded)
1632                                 tx_tspec->action =
1633                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1634                 }
1635 
1636                 switch (tx_tspec->action) {
1637                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1638                         /* take the original parameters */
1639                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1640                                 sdata_err(sdata,
1641                                           "failed to set TX queue parameters for queue %d\n",
1642                                           ac);
1643                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1644                         tx_tspec->downgraded = false;
1645                         ret = true;
1646                         break;
1647                 case TX_TSPEC_ACTION_DOWNGRADE:
1648                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1649                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1650                                 ret = true;
1651                                 break;
1652                         }
1653                         /* downgrade next lower non-ACM AC */
1654                         for (non_acm_ac = ac + 1;
1655                              non_acm_ac < IEEE80211_NUM_ACS;
1656                              non_acm_ac++)
1657                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1658                                         break;
1659                         /* Usually the loop will result in using BK even if it
1660                          * requires admission control, but such a configuration
1661                          * makes no sense and we have to transmit somehow - the
1662                          * AC selection does the same thing.
1663                          * If we started out trying to downgrade from BK, then
1664                          * the extra condition here might be needed.
1665                          */
1666                         if (non_acm_ac >= IEEE80211_NUM_ACS)
1667                                 non_acm_ac = IEEE80211_AC_BK;
1668                         if (drv_conf_tx(local, sdata, ac,
1669                                         &sdata->tx_conf[non_acm_ac]))
1670                                 sdata_err(sdata,
1671                                           "failed to set TX queue parameters for queue %d\n",
1672                                           ac);
1673                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1674                         ret = true;
1675                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1676                                 tx_tspec->time_slice_start + HZ - now + 1);
1677                         break;
1678                 case TX_TSPEC_ACTION_NONE:
1679                         /* nothing now */
1680                         break;
1681                 }
1682         }
1683 
1684         return ret;
1685 }
1686 
1687 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1688 {
1689         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1690                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1691 }
1692 
1693 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1694 {
1695         struct ieee80211_sub_if_data *sdata;
1696 
1697         sdata = container_of(work, struct ieee80211_sub_if_data,
1698                              u.mgd.tx_tspec_wk.work);
1699         ieee80211_sta_handle_tspec_ac_params(sdata);
1700 }
1701 
1702 /* MLME */
1703 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1704                                      struct ieee80211_sub_if_data *sdata,
1705                                      const u8 *wmm_param, size_t wmm_param_len)
1706 {
1707         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1708         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1709         size_t left;
1710         int count, ac;
1711         const u8 *pos;
1712         u8 uapsd_queues = 0;
1713 
1714         if (!local->ops->conf_tx)
1715                 return false;
1716 
1717         if (local->hw.queues < IEEE80211_NUM_ACS)
1718                 return false;
1719 
1720         if (!wmm_param)
1721                 return false;
1722 
1723         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1724                 return false;
1725 
1726         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1727                 uapsd_queues = ifmgd->uapsd_queues;
1728 
1729         count = wmm_param[6] & 0x0f;
1730         if (count == ifmgd->wmm_last_param_set)
1731                 return false;
1732         ifmgd->wmm_last_param_set = count;
1733 
1734         pos = wmm_param + 8;
1735         left = wmm_param_len - 8;
1736 
1737         memset(&params, 0, sizeof(params));
1738 
1739         sdata->wmm_acm = 0;
1740         for (; left >= 4; left -= 4, pos += 4) {
1741                 int aci = (pos[0] >> 5) & 0x03;
1742                 int acm = (pos[0] >> 4) & 0x01;
1743                 bool uapsd = false;
1744 
1745                 switch (aci) {
1746                 case 1: /* AC_BK */
1747                         ac = IEEE80211_AC_BK;
1748                         if (acm)
1749                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1750                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1751                                 uapsd = true;
1752                         break;
1753                 case 2: /* AC_VI */
1754                         ac = IEEE80211_AC_VI;
1755                         if (acm)
1756                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1757                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1758                                 uapsd = true;
1759                         break;
1760                 case 3: /* AC_VO */
1761                         ac = IEEE80211_AC_VO;
1762                         if (acm)
1763                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1764                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1765                                 uapsd = true;
1766                         break;
1767                 case 0: /* AC_BE */
1768                 default:
1769                         ac = IEEE80211_AC_BE;
1770                         if (acm)
1771                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1772                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1773                                 uapsd = true;
1774                         break;
1775                 }
1776 
1777                 params[ac].aifs = pos[0] & 0x0f;
1778 
1779                 if (params[ac].aifs < 2) {
1780                         sdata_info(sdata,
1781                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1782                                    params[ac].aifs, aci);
1783                         params[ac].aifs = 2;
1784                 }
1785                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1786                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1787                 params[ac].txop = get_unaligned_le16(pos + 2);
1788                 params[ac].acm = acm;
1789                 params[ac].uapsd = uapsd;
1790 
1791                 if (params[ac].cw_min == 0 ||
1792                     params[ac].cw_min > params[ac].cw_max) {
1793                         sdata_info(sdata,
1794                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1795                                    params[ac].cw_min, params[ac].cw_max, aci);
1796                         return false;
1797                 }
1798                 ieee80211_regulatory_limit_wmm_params(sdata, &params[ac], ac);
1799         }
1800 
1801         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1802                 mlme_dbg(sdata,
1803                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1804                          ac, params[ac].acm,
1805                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1806                          params[ac].txop, params[ac].uapsd,
1807                          ifmgd->tx_tspec[ac].downgraded);
1808                 sdata->tx_conf[ac] = params[ac];
1809                 if (!ifmgd->tx_tspec[ac].downgraded &&
1810                     drv_conf_tx(local, sdata, ac, &params[ac]))
1811                         sdata_err(sdata,
1812                                   "failed to set TX queue parameters for AC %d\n",
1813                                   ac);
1814         }
1815 
1816         /* enable WMM or activate new settings */
1817         sdata->vif.bss_conf.qos = true;
1818         return true;
1819 }
1820 
1821 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1822 {
1823         lockdep_assert_held(&sdata->local->mtx);
1824 
1825         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1826         ieee80211_run_deferred_scan(sdata->local);
1827 }
1828 
1829 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1830 {
1831         mutex_lock(&sdata->local->mtx);
1832         __ieee80211_stop_poll(sdata);
1833         mutex_unlock(&sdata->local->mtx);
1834 }
1835 
1836 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1837                                            u16 capab, bool erp_valid, u8 erp)
1838 {
1839         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1840         struct ieee80211_supported_band *sband;
1841         u32 changed = 0;
1842         bool use_protection;
1843         bool use_short_preamble;
1844         bool use_short_slot;
1845 
1846         sband = ieee80211_get_sband(sdata);
1847         if (!sband)
1848                 return changed;
1849 
1850         if (erp_valid) {
1851                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1852                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1853         } else {
1854                 use_protection = false;
1855                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1856         }
1857 
1858         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1859         if (sband->band == NL80211_BAND_5GHZ)
1860                 use_short_slot = true;
1861 
1862         if (use_protection != bss_conf->use_cts_prot) {
1863                 bss_conf->use_cts_prot = use_protection;
1864                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1865         }
1866 
1867         if (use_short_preamble != bss_conf->use_short_preamble) {
1868                 bss_conf->use_short_preamble = use_short_preamble;
1869                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1870         }
1871 
1872         if (use_short_slot != bss_conf->use_short_slot) {
1873                 bss_conf->use_short_slot = use_short_slot;
1874                 changed |= BSS_CHANGED_ERP_SLOT;
1875         }
1876 
1877         return changed;
1878 }
1879 
1880 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1881                                      struct cfg80211_bss *cbss,
1882                                      u32 bss_info_changed)
1883 {
1884         struct ieee80211_bss *bss = (void *)cbss->priv;
1885         struct ieee80211_local *local = sdata->local;
1886         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1887 
1888         bss_info_changed |= BSS_CHANGED_ASSOC;
1889         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1890                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1891 
1892         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1893                 beacon_loss_count * bss_conf->beacon_int));
1894 
1895         sdata->u.mgd.associated = cbss;
1896         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1897 
1898         ieee80211_check_rate_mask(sdata);
1899 
1900         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1901 
1902         if (sdata->vif.p2p ||
1903             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1904                 const struct cfg80211_bss_ies *ies;
1905 
1906                 rcu_read_lock();
1907                 ies = rcu_dereference(cbss->ies);
1908                 if (ies) {
1909                         int ret;
1910 
1911                         ret = cfg80211_get_p2p_attr(
1912                                         ies->data, ies->len,
1913                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1914                                         (u8 *) &bss_conf->p2p_noa_attr,
1915                                         sizeof(bss_conf->p2p_noa_attr));
1916                         if (ret >= 2) {
1917                                 sdata->u.mgd.p2p_noa_index =
1918                                         bss_conf->p2p_noa_attr.index;
1919                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1920                         }
1921                 }
1922                 rcu_read_unlock();
1923         }
1924 
1925         /* just to be sure */
1926         ieee80211_stop_poll(sdata);
1927 
1928         ieee80211_led_assoc(local, 1);
1929 
1930         if (sdata->u.mgd.have_beacon) {
1931                 /*
1932                  * If the AP is buggy we may get here with no DTIM period
1933                  * known, so assume it's 1 which is the only safe assumption
1934                  * in that case, although if the TIM IE is broken powersave
1935                  * probably just won't work at all.
1936                  */
1937                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1938                 bss_conf->beacon_rate = bss->beacon_rate;
1939                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1940         } else {
1941                 bss_conf->beacon_rate = NULL;
1942                 bss_conf->dtim_period = 0;
1943         }
1944 
1945         bss_conf->assoc = 1;
1946 
1947         /* Tell the driver to monitor connection quality (if supported) */
1948         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1949             bss_conf->cqm_rssi_thold)
1950                 bss_info_changed |= BSS_CHANGED_CQM;
1951 
1952         /* Enable ARP filtering */
1953         if (bss_conf->arp_addr_cnt)
1954                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1955 
1956         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1957 
1958         mutex_lock(&local->iflist_mtx);
1959         ieee80211_recalc_ps(local);
1960         mutex_unlock(&local->iflist_mtx);
1961 
1962         ieee80211_recalc_smps(sdata);
1963         ieee80211_recalc_ps_vif(sdata);
1964 
1965         netif_carrier_on(sdata->dev);
1966 }
1967 
1968 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1969                                    u16 stype, u16 reason, bool tx,
1970                                    u8 *frame_buf)
1971 {
1972         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1973         struct ieee80211_local *local = sdata->local;
1974         u32 changed = 0;
1975 
1976         sdata_assert_lock(sdata);
1977 
1978         if (WARN_ON_ONCE(tx && !frame_buf))
1979                 return;
1980 
1981         if (WARN_ON(!ifmgd->associated))
1982                 return;
1983 
1984         ieee80211_stop_poll(sdata);
1985 
1986         ifmgd->associated = NULL;
1987         netif_carrier_off(sdata->dev);
1988 
1989         /*
1990          * if we want to get out of ps before disassoc (why?) we have
1991          * to do it before sending disassoc, as otherwise the null-packet
1992          * won't be valid.
1993          */
1994         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1995                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1996                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1997         }
1998         local->ps_sdata = NULL;
1999 
2000         /* disable per-vif ps */
2001         ieee80211_recalc_ps_vif(sdata);
2002 
2003         /* make sure ongoing transmission finishes */
2004         synchronize_net();
2005 
2006         /*
2007          * drop any frame before deauth/disassoc, this can be data or
2008          * management frame. Since we are disconnecting, we should not
2009          * insist sending these frames which can take time and delay
2010          * the disconnection and possible the roaming.
2011          */
2012         if (tx)
2013                 ieee80211_flush_queues(local, sdata, true);
2014 
2015         /* deauthenticate/disassociate now */
2016         if (tx || frame_buf) {
2017                 /*
2018                  * In multi channel scenarios guarantee that the virtual
2019                  * interface is granted immediate airtime to transmit the
2020                  * deauthentication frame by calling mgd_prepare_tx, if the
2021                  * driver requested so.
2022                  */
2023                 if (ieee80211_hw_check(&local->hw, DEAUTH_NEED_MGD_TX_PREP) &&
2024                     !ifmgd->have_beacon)
2025                         drv_mgd_prepare_tx(sdata->local, sdata);
2026 
2027                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2028                                                reason, tx, frame_buf);
2029         }
2030 
2031         /* flush out frame - make sure the deauth was actually sent */
2032         if (tx)
2033                 ieee80211_flush_queues(local, sdata, false);
2034 
2035         /* clear bssid only after building the needed mgmt frames */
2036         eth_zero_addr(ifmgd->bssid);
2037 
2038         /* remove AP and TDLS peers */
2039         sta_info_flush(sdata);
2040 
2041         /* finally reset all BSS / config parameters */
2042         changed |= ieee80211_reset_erp_info(sdata);
2043 
2044         ieee80211_led_assoc(local, 0);
2045         changed |= BSS_CHANGED_ASSOC;
2046         sdata->vif.bss_conf.assoc = false;
2047 
2048         ifmgd->p2p_noa_index = -1;
2049         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2050                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2051 
2052         /* on the next assoc, re-program HT/VHT parameters */
2053         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2054         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2055         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2056         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2057 
2058         /* reset MU-MIMO ownership and group data */
2059         memset(sdata->vif.bss_conf.mu_group.membership, 0,
2060                sizeof(sdata->vif.bss_conf.mu_group.membership));
2061         memset(sdata->vif.bss_conf.mu_group.position, 0,
2062                sizeof(sdata->vif.bss_conf.mu_group.position));
2063         changed |= BSS_CHANGED_MU_GROUPS;
2064         sdata->vif.mu_mimo_owner = false;
2065 
2066         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2067 
2068         del_timer_sync(&local->dynamic_ps_timer);
2069         cancel_work_sync(&local->dynamic_ps_enable_work);
2070 
2071         /* Disable ARP filtering */
2072         if (sdata->vif.bss_conf.arp_addr_cnt)
2073                 changed |= BSS_CHANGED_ARP_FILTER;
2074 
2075         sdata->vif.bss_conf.qos = false;
2076         changed |= BSS_CHANGED_QOS;
2077 
2078         /* The BSSID (not really interesting) and HT changed */
2079         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2080         ieee80211_bss_info_change_notify(sdata, changed);
2081 
2082         /* disassociated - set to defaults now */
2083         ieee80211_set_wmm_default(sdata, false, false);
2084 
2085         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2086         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2087         del_timer_sync(&sdata->u.mgd.timer);
2088         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2089 
2090         sdata->vif.bss_conf.dtim_period = 0;
2091         sdata->vif.bss_conf.beacon_rate = NULL;
2092 
2093         ifmgd->have_beacon = false;
2094 
2095         ifmgd->flags = 0;
2096         mutex_lock(&local->mtx);
2097         ieee80211_vif_release_channel(sdata);
2098 
2099         sdata->vif.csa_active = false;
2100         ifmgd->csa_waiting_bcn = false;
2101         ifmgd->csa_ignored_same_chan = false;
2102         if (sdata->csa_block_tx) {
2103                 ieee80211_wake_vif_queues(local, sdata,
2104                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2105                 sdata->csa_block_tx = false;
2106         }
2107         mutex_unlock(&local->mtx);
2108 
2109         /* existing TX TSPEC sessions no longer exist */
2110         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2111         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2112 
2113         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2114 }
2115 
2116 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2117                              struct ieee80211_hdr *hdr)
2118 {
2119         /*
2120          * We can postpone the mgd.timer whenever receiving unicast frames
2121          * from AP because we know that the connection is working both ways
2122          * at that time. But multicast frames (and hence also beacons) must
2123          * be ignored here, because we need to trigger the timer during
2124          * data idle periods for sending the periodic probe request to the
2125          * AP we're connected to.
2126          */
2127         if (is_multicast_ether_addr(hdr->addr1))
2128                 return;
2129 
2130         ieee80211_sta_reset_conn_monitor(sdata);
2131 }
2132 
2133 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2134 {
2135         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2136         struct ieee80211_local *local = sdata->local;
2137 
2138         mutex_lock(&local->mtx);
2139         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2140                 goto out;
2141 
2142         __ieee80211_stop_poll(sdata);
2143 
2144         mutex_lock(&local->iflist_mtx);
2145         ieee80211_recalc_ps(local);
2146         mutex_unlock(&local->iflist_mtx);
2147 
2148         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2149                 goto out;
2150 
2151         /*
2152          * We've received a probe response, but are not sure whether
2153          * we have or will be receiving any beacons or data, so let's
2154          * schedule the timers again, just in case.
2155          */
2156         ieee80211_sta_reset_beacon_monitor(sdata);
2157 
2158         mod_timer(&ifmgd->conn_mon_timer,
2159                   round_jiffies_up(jiffies +
2160                                    IEEE80211_CONNECTION_IDLE_TIME));
2161 out:
2162         mutex_unlock(&local->mtx);
2163 }
2164 
2165 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2166                                            struct ieee80211_hdr *hdr,
2167                                            u16 tx_time)
2168 {
2169         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2170         u16 tid = ieee80211_get_tid(hdr);
2171         int ac = ieee80211_ac_from_tid(tid);
2172         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2173         unsigned long now = jiffies;
2174 
2175         if (likely(!tx_tspec->admitted_time))
2176                 return;
2177 
2178         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2179                 tx_tspec->consumed_tx_time = 0;
2180                 tx_tspec->time_slice_start = now;
2181 
2182                 if (tx_tspec->downgraded) {
2183                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2184                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2185                 }
2186         }
2187 
2188         if (tx_tspec->downgraded)
2189                 return;
2190 
2191         tx_tspec->consumed_tx_time += tx_time;
2192 
2193         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2194                 tx_tspec->downgraded = true;
2195                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2196                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2197         }
2198 }
2199 
2200 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2201                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2202 {
2203         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2204 
2205         if (!ieee80211_is_data(hdr->frame_control))
2206             return;
2207 
2208         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2209             sdata->u.mgd.probe_send_count > 0) {
2210                 if (ack)
2211                         ieee80211_sta_reset_conn_monitor(sdata);
2212                 else
2213                         sdata->u.mgd.nullfunc_failed = true;
2214                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2215                 return;
2216         }
2217 
2218         if (ack)
2219                 ieee80211_sta_reset_conn_monitor(sdata);
2220 }
2221 
2222 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2223 {
2224         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2225         const u8 *ssid;
2226         u8 *dst = ifmgd->associated->bssid;
2227         u8 unicast_limit = max(1, max_probe_tries - 3);
2228         struct sta_info *sta;
2229 
2230         /*
2231          * Try sending broadcast probe requests for the last three
2232          * probe requests after the first ones failed since some
2233          * buggy APs only support broadcast probe requests.
2234          */
2235         if (ifmgd->probe_send_count >= unicast_limit)
2236                 dst = NULL;
2237 
2238         /*
2239          * When the hardware reports an accurate Tx ACK status, it's
2240          * better to send a nullfunc frame instead of a probe request,
2241          * as it will kick us off the AP quickly if we aren't associated
2242          * anymore. The timeout will be reset if the frame is ACKed by
2243          * the AP.
2244          */
2245         ifmgd->probe_send_count++;
2246 
2247         if (dst) {
2248                 mutex_lock(&sdata->local->sta_mtx);
2249                 sta = sta_info_get(sdata, dst);
2250                 if (!WARN_ON(!sta))
2251                         ieee80211_check_fast_rx(sta);
2252                 mutex_unlock(&sdata->local->sta_mtx);
2253         }
2254 
2255         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2256                 ifmgd->nullfunc_failed = false;
2257                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2258         } else {
2259                 int ssid_len;
2260 
2261                 rcu_read_lock();
2262                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2263                 if (WARN_ON_ONCE(ssid == NULL))
2264                         ssid_len = 0;
2265                 else
2266                         ssid_len = ssid[1];
2267 
2268                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2269                                          ssid + 2, ssid_len, NULL,
2270                                          0, (u32) -1, true, 0,
2271                                          ifmgd->associated->channel, false);
2272                 rcu_read_unlock();
2273         }
2274 
2275         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2276         run_again(sdata, ifmgd->probe_timeout);
2277 }
2278 
2279 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2280                                    bool beacon)
2281 {
2282         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2283         bool already = false;
2284 
2285         if (!ieee80211_sdata_running(sdata))
2286                 return;
2287 
2288         sdata_lock(sdata);
2289 
2290         if (!ifmgd->associated)
2291                 goto out;
2292 
2293         mutex_lock(&sdata->local->mtx);
2294 
2295         if (sdata->local->tmp_channel || sdata->local->scanning) {
2296                 mutex_unlock(&sdata->local->mtx);
2297                 goto out;
2298         }
2299 
2300         if (beacon) {
2301                 mlme_dbg_ratelimited(sdata,
2302                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2303                                      beacon_loss_count);
2304 
2305                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2306         }
2307 
2308         /*
2309          * The driver/our work has already reported this event or the
2310          * connection monitoring has kicked in and we have already sent
2311          * a probe request. Or maybe the AP died and the driver keeps
2312          * reporting until we disassociate...
2313          *
2314          * In either case we have to ignore the current call to this
2315          * function (except for setting the correct probe reason bit)
2316          * because otherwise we would reset the timer every time and
2317          * never check whether we received a probe response!
2318          */
2319         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2320                 already = true;
2321 
2322         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2323 
2324         mutex_unlock(&sdata->local->mtx);
2325 
2326         if (already)
2327                 goto out;
2328 
2329         mutex_lock(&sdata->local->iflist_mtx);
2330         ieee80211_recalc_ps(sdata->local);
2331         mutex_unlock(&sdata->local->iflist_mtx);
2332 
2333         ifmgd->probe_send_count = 0;
2334         ieee80211_mgd_probe_ap_send(sdata);
2335  out:
2336         sdata_unlock(sdata);
2337 }
2338 
2339 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2340                                           struct ieee80211_vif *vif)
2341 {
2342         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2343         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2344         struct cfg80211_bss *cbss;
2345         struct sk_buff *skb;
2346         const u8 *ssid;
2347         int ssid_len;
2348 
2349         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2350                 return NULL;
2351 
2352         sdata_assert_lock(sdata);
2353 
2354         if (ifmgd->associated)
2355                 cbss = ifmgd->associated;
2356         else if (ifmgd->auth_data)
2357                 cbss = ifmgd->auth_data->bss;
2358         else if (ifmgd->assoc_data)
2359                 cbss = ifmgd->assoc_data->bss;
2360         else
2361                 return NULL;
2362 
2363         rcu_read_lock();
2364         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2365         if (WARN_ON_ONCE(ssid == NULL))
2366                 ssid_len = 0;
2367         else
2368                 ssid_len = ssid[1];
2369 
2370         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2371                                         (u32) -1, cbss->channel,
2372                                         ssid + 2, ssid_len,
2373                                         NULL, 0, true);
2374         rcu_read_unlock();
2375 
2376         return skb;
2377 }
2378 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2379 
2380 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2381                                         const u8 *buf, size_t len, bool tx,
2382                                         u16 reason)
2383 {
2384         struct ieee80211_event event = {
2385                 .type = MLME_EVENT,
2386                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2387                 .u.mlme.reason = reason,
2388         };
2389 
2390         if (tx)
2391                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2392         else
2393                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2394 
2395         drv_event_callback(sdata->local, sdata, &event);
2396 }
2397 
2398 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2399 {
2400         struct ieee80211_local *local = sdata->local;
2401         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2402         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2403 
2404         sdata_lock(sdata);
2405         if (!ifmgd->associated) {
2406                 sdata_unlock(sdata);
2407                 return;
2408         }
2409 
2410         /* AP is probably out of range (or not reachable for another reason) so
2411          * remove the bss struct for that AP.
2412          */
2413         cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2414 
2415         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2416                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2417                                true, frame_buf);
2418         mutex_lock(&local->mtx);
2419         sdata->vif.csa_active = false;
2420         ifmgd->csa_waiting_bcn = false;
2421         if (sdata->csa_block_tx) {
2422                 ieee80211_wake_vif_queues(local, sdata,
2423                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2424                 sdata->csa_block_tx = false;
2425         }
2426         mutex_unlock(&local->mtx);
2427 
2428         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2429                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2430 
2431         sdata_unlock(sdata);
2432 }
2433 
2434 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2435 {
2436         struct ieee80211_sub_if_data *sdata =
2437                 container_of(work, struct ieee80211_sub_if_data,
2438                              u.mgd.beacon_connection_loss_work);
2439         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2440 
2441         if (ifmgd->associated)
2442                 ifmgd->beacon_loss_count++;
2443 
2444         if (ifmgd->connection_loss) {
2445                 sdata_info(sdata, "Connection to AP %pM lost\n",
2446                            ifmgd->bssid);
2447                 __ieee80211_disconnect(sdata);
2448         } else {
2449                 ieee80211_mgd_probe_ap(sdata, true);
2450         }
2451 }
2452 
2453 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2454 {
2455         struct ieee80211_sub_if_data *sdata =
2456                 container_of(work, struct ieee80211_sub_if_data,
2457                              u.mgd.csa_connection_drop_work);
2458 
2459         __ieee80211_disconnect(sdata);
2460 }
2461 
2462 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2463 {
2464         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2465         struct ieee80211_hw *hw = &sdata->local->hw;
2466 
2467         trace_api_beacon_loss(sdata);
2468 
2469         sdata->u.mgd.connection_loss = false;
2470         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2471 }
2472 EXPORT_SYMBOL(ieee80211_beacon_loss);
2473 
2474 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2475 {
2476         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2477         struct ieee80211_hw *hw = &sdata->local->hw;
2478 
2479         trace_api_connection_loss(sdata);
2480 
2481         sdata->u.mgd.connection_loss = true;
2482         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2483 }
2484 EXPORT_SYMBOL(ieee80211_connection_loss);
2485 
2486 
2487 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2488                                         bool assoc)
2489 {
2490         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2491 
2492         sdata_assert_lock(sdata);
2493 
2494         if (!assoc) {
2495                 /*
2496                  * we are not authenticated yet, the only timer that could be
2497                  * running is the timeout for the authentication response which
2498                  * which is not relevant anymore.
2499                  */
2500                 del_timer_sync(&sdata->u.mgd.timer);
2501                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2502 
2503                 eth_zero_addr(sdata->u.mgd.bssid);
2504                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2505                 sdata->u.mgd.flags = 0;
2506                 mutex_lock(&sdata->local->mtx);
2507                 ieee80211_vif_release_channel(sdata);
2508                 mutex_unlock(&sdata->local->mtx);
2509         }
2510 
2511         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2512         kfree(auth_data);
2513         sdata->u.mgd.auth_data = NULL;
2514 }
2515 
2516 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2517                                          bool assoc, bool abandon)
2518 {
2519         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2520 
2521         sdata_assert_lock(sdata);
2522 
2523         if (!assoc) {
2524                 /*
2525                  * we are not associated yet, the only timer that could be
2526                  * running is the timeout for the association response which
2527                  * which is not relevant anymore.
2528                  */
2529                 del_timer_sync(&sdata->u.mgd.timer);
2530                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2531 
2532                 eth_zero_addr(sdata->u.mgd.bssid);
2533                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2534                 sdata->u.mgd.flags = 0;
2535                 sdata->vif.mu_mimo_owner = false;
2536 
2537                 mutex_lock(&sdata->local->mtx);
2538                 ieee80211_vif_release_channel(sdata);
2539                 mutex_unlock(&sdata->local->mtx);
2540 
2541                 if (abandon)
2542                         cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2543         }
2544 
2545         kfree(assoc_data);
2546         sdata->u.mgd.assoc_data = NULL;
2547 }
2548 
2549 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2550                                      struct ieee80211_mgmt *mgmt, size_t len)
2551 {
2552         struct ieee80211_local *local = sdata->local;
2553         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2554         u8 *pos;
2555         struct ieee802_11_elems elems;
2556         u32 tx_flags = 0;
2557 
2558         pos = mgmt->u.auth.variable;
2559         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2560         if (!elems.challenge)
2561                 return;
2562         auth_data->expected_transaction = 4;
2563         drv_mgd_prepare_tx(sdata->local, sdata);
2564         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2565                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2566                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2567         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2568                             elems.challenge - 2, elems.challenge_len + 2,
2569                             auth_data->bss->bssid, auth_data->bss->bssid,
2570                             auth_data->key, auth_data->key_len,
2571                             auth_data->key_idx, tx_flags);
2572 }
2573 
2574 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2575                                    struct ieee80211_mgmt *mgmt, size_t len)
2576 {
2577         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2578         u8 bssid[ETH_ALEN];
2579         u16 auth_alg, auth_transaction, status_code;
2580         struct sta_info *sta;
2581         struct ieee80211_event event = {
2582                 .type = MLME_EVENT,
2583                 .u.mlme.data = AUTH_EVENT,
2584         };
2585 
2586         sdata_assert_lock(sdata);
2587 
2588         if (len < 24 + 6)
2589                 return;
2590 
2591         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2592                 return;
2593 
2594         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2595 
2596         if (!ether_addr_equal(bssid, mgmt->bssid))
2597                 return;
2598 
2599         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2600         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2601         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2602 
2603         if (auth_alg != ifmgd->auth_data->algorithm ||
2604             auth_transaction != ifmgd->auth_data->expected_transaction) {
2605                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2606                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2607                            auth_transaction,
2608                            ifmgd->auth_data->expected_transaction);
2609                 return;
2610         }
2611 
2612         if (status_code != WLAN_STATUS_SUCCESS) {
2613                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2614                            mgmt->sa, status_code);
2615                 ieee80211_destroy_auth_data(sdata, false);
2616                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2617                 event.u.mlme.status = MLME_DENIED;
2618                 event.u.mlme.reason = status_code;
2619                 drv_event_callback(sdata->local, sdata, &event);
2620                 return;
2621         }
2622 
2623         switch (ifmgd->auth_data->algorithm) {
2624         case WLAN_AUTH_OPEN:
2625         case WLAN_AUTH_LEAP:
2626         case WLAN_AUTH_FT:
2627         case WLAN_AUTH_SAE:
2628         case WLAN_AUTH_FILS_SK:
2629         case WLAN_AUTH_FILS_SK_PFS:
2630         case WLAN_AUTH_FILS_PK:
2631                 break;
2632         case WLAN_AUTH_SHARED_KEY:
2633                 if (ifmgd->auth_data->expected_transaction != 4) {
2634                         ieee80211_auth_challenge(sdata, mgmt, len);
2635                         /* need another frame */
2636                         return;
2637                 }
2638                 break;
2639         default:
2640                 WARN_ONCE(1, "invalid auth alg %d",
2641                           ifmgd->auth_data->algorithm);
2642                 return;
2643         }
2644 
2645         event.u.mlme.status = MLME_SUCCESS;
2646         drv_event_callback(sdata->local, sdata, &event);
2647         sdata_info(sdata, "authenticated\n");
2648         ifmgd->auth_data->done = true;
2649         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2650         ifmgd->auth_data->timeout_started = true;
2651         run_again(sdata, ifmgd->auth_data->timeout);
2652 
2653         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2654             ifmgd->auth_data->expected_transaction != 2) {
2655                 /*
2656                  * Report auth frame to user space for processing since another
2657                  * round of Authentication frames is still needed.
2658                  */
2659                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2660                 return;
2661         }
2662 
2663         /* move station state to auth */
2664         mutex_lock(&sdata->local->sta_mtx);
2665         sta = sta_info_get(sdata, bssid);
2666         if (!sta) {
2667                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2668                 goto out_err;
2669         }
2670         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2671                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2672                 goto out_err;
2673         }
2674         mutex_unlock(&sdata->local->sta_mtx);
2675 
2676         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2677         return;
2678  out_err:
2679         mutex_unlock(&sdata->local->sta_mtx);
2680         /* ignore frame -- wait for timeout */
2681 }
2682 
2683 #define case_WLAN(type) \
2684         case WLAN_REASON_##type: return #type
2685 
2686 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2687 {
2688         switch (reason_code) {
2689         case_WLAN(UNSPECIFIED);
2690         case_WLAN(PREV_AUTH_NOT_VALID);
2691         case_WLAN(DEAUTH_LEAVING);
2692         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2693         case_WLAN(DISASSOC_AP_BUSY);
2694         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2695         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2696         case_WLAN(DISASSOC_STA_HAS_LEFT);
2697         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2698         case_WLAN(DISASSOC_BAD_POWER);
2699         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2700         case_WLAN(INVALID_IE);
2701         case_WLAN(MIC_FAILURE);
2702         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2703         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2704         case_WLAN(IE_DIFFERENT);
2705         case_WLAN(INVALID_GROUP_CIPHER);
2706         case_WLAN(INVALID_PAIRWISE_CIPHER);
2707         case_WLAN(INVALID_AKMP);
2708         case_WLAN(UNSUPP_RSN_VERSION);
2709         case_WLAN(INVALID_RSN_IE_CAP);
2710         case_WLAN(IEEE8021X_FAILED);
2711         case_WLAN(CIPHER_SUITE_REJECTED);
2712         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2713         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2714         case_WLAN(DISASSOC_LOW_ACK);
2715         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2716         case_WLAN(QSTA_LEAVE_QBSS);
2717         case_WLAN(QSTA_NOT_USE);
2718         case_WLAN(QSTA_REQUIRE_SETUP);
2719         case_WLAN(QSTA_TIMEOUT);
2720         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2721         case_WLAN(MESH_PEER_CANCELED);
2722         case_WLAN(MESH_MAX_PEERS);
2723         case_WLAN(MESH_CONFIG);
2724         case_WLAN(MESH_CLOSE);
2725         case_WLAN(MESH_MAX_RETRIES);
2726         case_WLAN(MESH_CONFIRM_TIMEOUT);
2727         case_WLAN(MESH_INVALID_GTK);
2728         case_WLAN(MESH_INCONSISTENT_PARAM);
2729         case_WLAN(MESH_INVALID_SECURITY);
2730         case_WLAN(MESH_PATH_ERROR);
2731         case_WLAN(MESH_PATH_NOFORWARD);
2732         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2733         case_WLAN(MAC_EXISTS_IN_MBSS);
2734         case_WLAN(MESH_CHAN_REGULATORY);
2735         case_WLAN(MESH_CHAN);
2736         default: return "<unknown>";
2737         }
2738 }
2739 
2740 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2741                                      struct ieee80211_mgmt *mgmt, size_t len)
2742 {
2743         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2744         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2745 
2746         sdata_assert_lock(sdata);
2747 
2748         if (len < 24 + 2)
2749                 return;
2750 
2751         if (ifmgd->associated &&
2752             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2753                 const u8 *bssid = ifmgd->associated->bssid;
2754 
2755                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2756                            bssid, reason_code,
2757                            ieee80211_get_reason_code_string(reason_code));
2758 
2759                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2760 
2761                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2762                                             reason_code);
2763                 return;
2764         }
2765 
2766         if (ifmgd->assoc_data &&
2767             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2768                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2769 
2770                 sdata_info(sdata,
2771                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2772                            bssid, reason_code,
2773                            ieee80211_get_reason_code_string(reason_code));
2774 
2775                 ieee80211_destroy_assoc_data(sdata, false, true);
2776 
2777                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2778                 return;
2779         }
2780 }
2781 
2782 
2783 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2784                                        struct ieee80211_mgmt *mgmt, size_t len)
2785 {
2786         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2787         u16 reason_code;
2788 
2789         sdata_assert_lock(sdata);
2790 
2791         if (len < 24 + 2)
2792                 return;
2793 
2794         if (!ifmgd->associated ||
2795             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2796                 return;
2797 
2798         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2799 
2800         sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
2801                    mgmt->sa, reason_code,
2802                    ieee80211_get_reason_code_string(reason_code));
2803 
2804         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2805 
2806         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2807 }
2808 
2809 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2810                                 u8 *supp_rates, unsigned int supp_rates_len,
2811                                 u32 *rates, u32 *basic_rates,
2812                                 bool *have_higher_than_11mbit,
2813                                 int *min_rate, int *min_rate_index,
2814                                 int shift)
2815 {
2816         int i, j;
2817 
2818         for (i = 0; i < supp_rates_len; i++) {
2819                 int rate = supp_rates[i] & 0x7f;
2820                 bool is_basic = !!(supp_rates[i] & 0x80);
2821 
2822                 if ((rate * 5 * (1 << shift)) > 110)
2823                         *have_higher_than_11mbit = true;
2824 
2825                 /*
2826                  * Skip HT and VHT BSS membership selectors since they're not
2827                  * rates.
2828                  *
2829                  * Note: Even though the membership selector and the basic
2830                  *       rate flag share the same bit, they are not exactly
2831                  *       the same.
2832                  */
2833                 if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) ||
2834                     supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY))
2835                         continue;
2836 
2837                 for (j = 0; j < sband->n_bitrates; j++) {
2838                         struct ieee80211_rate *br;
2839                         int brate;
2840 
2841                         br = &sband->bitrates[j];
2842 
2843                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2844                         if (brate == rate) {
2845                                 *rates |= BIT(j);
2846                                 if (is_basic)
2847                                         *basic_rates |= BIT(j);
2848                                 if ((rate * 5) < *min_rate) {
2849                                         *min_rate = rate * 5;
2850                                         *min_rate_index = j;
2851                                 }
2852                                 break;
2853                         }
2854                 }
2855         }
2856 }
2857 
2858 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2859                                     struct cfg80211_bss *cbss,
2860                                     struct ieee80211_mgmt *mgmt, size_t len)
2861 {
2862         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2863         struct ieee80211_local *local = sdata->local;
2864         struct ieee80211_supported_band *sband;
2865         struct sta_info *sta;
2866         u8 *pos;
2867         u16 capab_info, aid;
2868         struct ieee802_11_elems elems;
2869         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2870         const struct cfg80211_bss_ies *bss_ies = NULL;
2871         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2872         u32 changed = 0;
2873         int err;
2874         bool ret;
2875 
2876         /* AssocResp and ReassocResp have identical structure */
2877 
2878         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2879         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2880 
2881         /*
2882          * The 5 MSB of the AID field are reserved
2883          * (802.11-2016 9.4.1.8 AID field)
2884          */
2885         aid &= 0x7ff;
2886 
2887         ifmgd->broken_ap = false;
2888 
2889         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2890                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2891                            aid);
2892                 aid = 0;
2893                 ifmgd->broken_ap = true;
2894         }
2895 
2896         pos = mgmt->u.assoc_resp.variable;
2897         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2898 
2899         if (!elems.supp_rates) {
2900                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2901                 return false;
2902         }
2903 
2904         ifmgd->aid = aid;
2905         ifmgd->tdls_chan_switch_prohibited =
2906                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2907                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2908 
2909         /*
2910          * Some APs are erroneously not including some information in their
2911          * (re)association response frames. Try to recover by using the data
2912          * from the beacon or probe response. This seems to afflict mobile
2913          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2914          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2915          */
2916         if ((assoc_data->wmm && !elems.wmm_param) ||
2917             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2918              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2919             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2920              (!elems.vht_cap_elem || !elems.vht_operation))) {
2921                 const struct cfg80211_bss_ies *ies;
2922                 struct ieee802_11_elems bss_elems;
2923 
2924                 rcu_read_lock();
2925                 ies = rcu_dereference(cbss->ies);
2926                 if (ies)
2927                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2928                                           GFP_ATOMIC);
2929                 rcu_read_unlock();
2930                 if (!bss_ies)
2931                         return false;
2932 
2933                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2934                                        false, &bss_elems);
2935                 if (assoc_data->wmm &&
2936                     !elems.wmm_param && bss_elems.wmm_param) {
2937                         elems.wmm_param = bss_elems.wmm_param;
2938                         sdata_info(sdata,
2939                                    "AP bug: WMM param missing from AssocResp\n");
2940                 }
2941 
2942                 /*
2943                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2944                  * have to include the IEs in the (re)association response.
2945                  */
2946                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2947                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2948                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2949                         sdata_info(sdata,
2950                                    "AP bug: HT capability missing from AssocResp\n");
2951                 }
2952                 if (!elems.ht_operation && bss_elems.ht_operation &&
2953                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2954                         elems.ht_operation = bss_elems.ht_operation;
2955                         sdata_info(sdata,
2956                                    "AP bug: HT operation missing from AssocResp\n");
2957                 }
2958                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2959                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2960                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2961                         sdata_info(sdata,
2962                                    "AP bug: VHT capa missing from AssocResp\n");
2963                 }
2964                 if (!elems.vht_operation && bss_elems.vht_operation &&
2965                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2966                         elems.vht_operation = bss_elems.vht_operation;
2967                         sdata_info(sdata,
2968                                    "AP bug: VHT operation missing from AssocResp\n");
2969                 }
2970         }
2971 
2972         /*
2973          * We previously checked these in the beacon/probe response, so
2974          * they should be present here. This is just a safety net.
2975          */
2976         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2977             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2978                 sdata_info(sdata,
2979                            "HT AP is missing WMM params or HT capability/operation\n");
2980                 ret = false;
2981                 goto out;
2982         }
2983 
2984         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2985             (!elems.vht_cap_elem || !elems.vht_operation)) {
2986                 sdata_info(sdata,
2987                            "VHT AP is missing VHT capability/operation\n");
2988                 ret = false;
2989                 goto out;
2990         }
2991 
2992         mutex_lock(&sdata->local->sta_mtx);
2993         /*
2994          * station info was already allocated and inserted before
2995          * the association and should be available to us
2996          */
2997         sta = sta_info_get(sdata, cbss->bssid);
2998         if (WARN_ON(!sta)) {
2999                 mutex_unlock(&sdata->local->sta_mtx);
3000                 ret = false;
3001                 goto out;
3002         }
3003 
3004         sband = ieee80211_get_sband(sdata);
3005         if (!sband) {
3006                 mutex_unlock(&sdata->local->sta_mtx);
3007                 ret = false;
3008                 goto out;
3009         }
3010 
3011         /* Set up internal HT/VHT capabilities */
3012         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3013                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3014                                                   elems.ht_cap_elem, sta);
3015 
3016         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3017                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3018                                                     elems.vht_cap_elem, sta);
3019 
3020         /*
3021          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3022          * in their association response, so ignore that data for our own
3023          * configuration. If it changed since the last beacon, we'll get the
3024          * next beacon and update then.
3025          */
3026 
3027         /*
3028          * If an operating mode notification IE is present, override the
3029          * NSS calculation (that would be done in rate_control_rate_init())
3030          * and use the # of streams from that element.
3031          */
3032         if (elems.opmode_notif &&
3033             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3034                 u8 nss;
3035 
3036                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3037                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3038                 nss += 1;
3039                 sta->sta.rx_nss = nss;
3040         }
3041 
3042         rate_control_rate_init(sta);
3043 
3044         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3045                 set_sta_flag(sta, WLAN_STA_MFP);
3046                 sta->sta.mfp = true;
3047         } else {
3048                 sta->sta.mfp = false;
3049         }
3050 
3051         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3052 
3053         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3054         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3055                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3056         if (err) {
3057                 sdata_info(sdata,
3058                            "failed to move station %pM to desired state\n",
3059                            sta->sta.addr);
3060                 WARN_ON(__sta_info_destroy(sta));
3061                 mutex_unlock(&sdata->local->sta_mtx);
3062                 ret = false;
3063                 goto out;
3064         }
3065 
3066         mutex_unlock(&sdata->local->sta_mtx);
3067 
3068         /*
3069          * Always handle WMM once after association regardless
3070          * of the first value the AP uses. Setting -1 here has
3071          * that effect because the AP values is an unsigned
3072          * 4-bit value.
3073          */
3074         ifmgd->wmm_last_param_set = -1;
3075 
3076         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3077                 ieee80211_set_wmm_default(sdata, false, false);
3078         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3079                                              elems.wmm_param_len)) {
3080                 /* still enable QoS since we might have HT/VHT */
3081                 ieee80211_set_wmm_default(sdata, false, true);
3082                 /* set the disable-WMM flag in this case to disable
3083                  * tracking WMM parameter changes in the beacon if
3084                  * the parameters weren't actually valid. Doing so
3085                  * avoids changing parameters very strangely when
3086                  * the AP is going back and forth between valid and
3087                  * invalid parameters.
3088                  */
3089                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3090         }
3091         changed |= BSS_CHANGED_QOS;
3092 
3093         if (elems.max_idle_period_ie) {
3094                 bss_conf->max_idle_period =
3095                         le16_to_cpu(elems.max_idle_period_ie->max_idle_period);
3096                 bss_conf->protected_keep_alive =
3097                         !!(elems.max_idle_period_ie->idle_options &
3098                            WLAN_IDLE_OPTIONS_PROTECTED_KEEP_ALIVE);
3099                 changed |= BSS_CHANGED_KEEP_ALIVE;
3100         } else {
3101                 bss_conf->max_idle_period = 0;
3102                 bss_conf->protected_keep_alive = false;
3103         }
3104 
3105         /* set AID and assoc capability,
3106          * ieee80211_set_associated() will tell the driver */
3107         bss_conf->aid = aid;
3108         bss_conf->assoc_capability = capab_info;
3109         ieee80211_set_associated(sdata, cbss, changed);
3110 
3111         /*
3112          * If we're using 4-addr mode, let the AP know that we're
3113          * doing so, so that it can create the STA VLAN on its side
3114          */
3115         if (ifmgd->use_4addr)
3116                 ieee80211_send_4addr_nullfunc(local, sdata);
3117 
3118         /*
3119          * Start timer to probe the connection to the AP now.
3120          * Also start the timer that will detect beacon loss.
3121          */
3122         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3123         ieee80211_sta_reset_beacon_monitor(sdata);
3124 
3125         ret = true;
3126  out:
3127         kfree(bss_ies);
3128         return ret;
3129 }
3130 
3131 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3132                                          struct ieee80211_mgmt *mgmt,
3133                                          size_t len)
3134 {
3135         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3136         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3137         u16 capab_info, status_code, aid;
3138         struct ieee802_11_elems elems;
3139         int ac, uapsd_queues = -1;
3140         u8 *pos;
3141         bool reassoc;
3142         struct cfg80211_bss *bss;
3143         struct ieee80211_event event = {
3144                 .type = MLME_EVENT,
3145                 .u.mlme.data = ASSOC_EVENT,
3146         };
3147 
3148         sdata_assert_lock(sdata);
3149 
3150         if (!assoc_data)
3151                 return;
3152         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3153                 return;
3154 
3155         /*
3156          * AssocResp and ReassocResp have identical structure, so process both
3157          * of them in this function.
3158          */
3159 
3160         if (len < 24 + 6)
3161                 return;
3162 
3163         reassoc = ieee80211_is_reassoc_resp(mgmt->frame_control);
3164         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3165         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3166         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3167 
3168         sdata_info(sdata,
3169                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3170                    reassoc ? "Rea" : "A", mgmt->sa,
3171                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3172 
3173         if (assoc_data->fils_kek_len &&
3174             fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
3175                 return;
3176 
3177         pos = mgmt->u.assoc_resp.variable;
3178         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3179 
3180         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3181             elems.timeout_int &&
3182             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3183                 u32 tu, ms;
3184                 tu = le32_to_cpu(elems.timeout_int->value);
3185                 ms = tu * 1024 / 1000;
3186                 sdata_info(sdata,
3187                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3188                            mgmt->sa, tu, ms);
3189                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3190                 assoc_data->timeout_started = true;
3191                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3192                         run_again(sdata, assoc_data->timeout);
3193                 return;
3194         }
3195 
3196         bss = assoc_data->bss;
3197 
3198         if (status_code != WLAN_STATUS_SUCCESS) {
3199                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3200                            mgmt->sa, status_code);
3201                 ieee80211_destroy_assoc_data(sdata, false, false);
3202                 event.u.mlme.status = MLME_DENIED;
3203                 event.u.mlme.reason = status_code;
3204                 drv_event_callback(sdata->local, sdata, &event);
3205         } else {
3206                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3207                         /* oops -- internal error -- send timeout for now */
3208                         ieee80211_destroy_assoc_data(sdata, false, false);
3209                         cfg80211_assoc_timeout(sdata->dev, bss);
3210                         return;
3211                 }
3212                 event.u.mlme.status = MLME_SUCCESS;
3213                 drv_event_callback(sdata->local, sdata, &event);
3214                 sdata_info(sdata, "associated\n");
3215 
3216                 /*
3217                  * destroy assoc_data afterwards, as otherwise an idle
3218                  * recalc after assoc_data is NULL but before associated
3219                  * is set can cause the interface to go idle
3220                  */
3221                 ieee80211_destroy_assoc_data(sdata, true, false);
3222 
3223                 /* get uapsd queues configuration */
3224                 uapsd_queues = 0;
3225                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3226                         if (sdata->tx_conf[ac].uapsd)
3227                                 uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
3228         }
3229 
3230         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3231 }
3232 
3233 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3234                                   struct ieee80211_mgmt *mgmt, size_t len,
3235                                   struct ieee80211_rx_status *rx_status,
3236                                   struct ieee802_11_elems *elems)
3237 {
3238         struct ieee80211_local *local = sdata->local;
3239         struct ieee80211_bss *bss;
3240         struct ieee80211_channel *channel;
3241 
3242         sdata_assert_lock(sdata);
3243 
3244         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3245         if (!channel)
3246                 return;
3247 
3248         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3249                                         channel);
3250         if (bss) {
3251                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3252                 ieee80211_rx_bss_put(local, bss);
3253         }
3254 }
3255 
3256 
3257 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3258                                          struct sk_buff *skb)
3259 {
3260         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3261         struct ieee80211_if_managed *ifmgd;
3262         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3263         size_t baselen, len = skb->len;
3264         struct ieee802_11_elems elems;
3265 
3266         ifmgd = &sdata->u.mgd;
3267 
3268         sdata_assert_lock(sdata);
3269 
3270         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3271                 return; /* ignore ProbeResp to foreign address */
3272 
3273         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3274         if (baselen > len)
3275                 return;
3276 
3277         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3278                                false, &elems);
3279 
3280         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3281 
3282         if (ifmgd->associated &&
3283             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3284                 ieee80211_reset_ap_probe(sdata);
3285 }
3286 
3287 /*
3288  * This is the canonical list of information elements we care about,
3289  * the filter code also gives us all changes to the Microsoft OUI
3290  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3291  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3292  * changes to requested client power.
3293  *
3294  * We implement beacon filtering in software since that means we can
3295  * avoid processing the frame here and in cfg80211, and userspace
3296  * will not be able to tell whether the hardware supports it or not.
3297  *
3298  * XXX: This list needs to be dynamic -- userspace needs to be able to
3299  *      add items it requires. It also needs to be able to tell us to
3300  *      look out for other vendor IEs.
3301  */
3302 static const u64 care_about_ies =
3303         (1ULL << WLAN_EID_COUNTRY) |
3304         (1ULL << WLAN_EID_ERP_INFO) |
3305         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3306         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3307         (1ULL << WLAN_EID_HT_CAPABILITY) |
3308         (1ULL << WLAN_EID_HT_OPERATION) |
3309         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3310 
3311 static void ieee80211_handle_beacon_sig(struct ieee80211_sub_if_data *sdata,
3312                                         struct ieee80211_if_managed *ifmgd,
3313                                         struct ieee80211_bss_conf *bss_conf,
3314                                         struct ieee80211_local *local,
3315                                         struct ieee80211_rx_status *rx_status)
3316 {
3317         /* Track average RSSI from the Beacon frames of the current AP */
3318 
3319         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3320                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3321                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3322                 ifmgd->last_cqm_event_signal = 0;
3323                 ifmgd->count_beacon_signal = 1;
3324                 ifmgd->last_ave_beacon_signal = 0;
3325         } else {
3326                 ifmgd->count_beacon_signal++;
3327         }
3328 
3329         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3330 
3331         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3332             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3333                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3334                 int last_sig = ifmgd->last_ave_beacon_signal;
3335                 struct ieee80211_event event = {
3336                         .type = RSSI_EVENT,
3337                 };
3338 
3339                 /*
3340                  * if signal crosses either of the boundaries, invoke callback
3341                  * with appropriate parameters
3342                  */
3343                 if (sig > ifmgd->rssi_max_thold &&
3344                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3345                         ifmgd->last_ave_beacon_signal = sig;
3346                         event.u.rssi.data = RSSI_EVENT_HIGH;
3347                         drv_event_callback(local, sdata, &event);
3348                 } else if (sig < ifmgd->rssi_min_thold &&
3349                            (last_sig >= ifmgd->rssi_max_thold ||
3350                            last_sig == 0)) {
3351                         ifmgd->last_ave_beacon_signal = sig;
3352                         event.u.rssi.data = RSSI_EVENT_LOW;
3353                         drv_event_callback(local, sdata, &event);
3354                 }
3355         }
3356 
3357         if (bss_conf->cqm_rssi_thold &&
3358             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3359             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3360                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3361                 int last_event = ifmgd->last_cqm_event_signal;
3362                 int thold = bss_conf->cqm_rssi_thold;
3363                 int hyst = bss_conf->cqm_rssi_hyst;
3364 
3365                 if (sig < thold &&
3366                     (last_event == 0 || sig < last_event - hyst)) {
3367                         ifmgd->last_cqm_event_signal = sig;
3368                         ieee80211_cqm_rssi_notify(
3369                                 &sdata->vif,
3370                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3371                                 sig, GFP_KERNEL);
3372                 } else if (sig > thold &&
3373                            (last_event == 0 || sig > last_event + hyst)) {
3374                         ifmgd->last_cqm_event_signal = sig;
3375                         ieee80211_cqm_rssi_notify(
3376                                 &sdata->vif,
3377                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3378                                 sig, GFP_KERNEL);
3379                 }
3380         }
3381 
3382         if (bss_conf->cqm_rssi_low &&
3383             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3384                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3385                 int last_event = ifmgd->last_cqm_event_signal;
3386                 int low = bss_conf->cqm_rssi_low;
3387                 int high = bss_conf->cqm_rssi_high;
3388 
3389                 if (sig < low &&
3390                     (last_event == 0 || last_event >= low)) {
3391                         ifmgd->last_cqm_event_signal = sig;
3392                         ieee80211_cqm_rssi_notify(
3393                                 &sdata->vif,
3394                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3395                                 sig, GFP_KERNEL);
3396                 } else if (sig > high &&
3397                            (last_event == 0 || last_event <= high)) {
3398                         ifmgd->last_cqm_event_signal = sig;
3399                         ieee80211_cqm_rssi_notify(
3400                                 &sdata->vif,
3401                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3402                                 sig, GFP_KERNEL);
3403                 }
3404         }
3405 }
3406 
3407 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3408                                      struct ieee80211_mgmt *mgmt, size_t len,
3409                                      struct ieee80211_rx_status *rx_status)
3410 {
3411         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3412         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3413         size_t baselen;
3414         struct ieee802_11_elems elems;
3415         struct ieee80211_local *local = sdata->local;
3416         struct ieee80211_chanctx_conf *chanctx_conf;
3417         struct ieee80211_channel *chan;
3418         struct sta_info *sta;
3419         u32 changed = 0;
3420         bool erp_valid;
3421         u8 erp_value = 0;
3422         u32 ncrc;
3423         u8 *bssid;
3424         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3425 
3426         sdata_assert_lock(sdata);
3427 
3428         /* Process beacon from the current BSS */
3429         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3430         if (baselen > len)
3431                 return;
3432 
3433         rcu_read_lock();
3434         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3435         if (!chanctx_conf) {
3436                 rcu_read_unlock();
3437                 return;
3438         }
3439 
3440         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3441                 rcu_read_unlock();
3442                 return;
3443         }
3444         chan = chanctx_conf->def.chan;
3445         rcu_read_unlock();
3446 
3447         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3448             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3449                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3450                                        len - baselen, false, &elems);
3451 
3452                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3453                 if (elems.tim && !elems.parse_error) {
3454                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3455                         ifmgd->dtim_period = tim_ie->dtim_period;
3456                 }
3457                 ifmgd->have_beacon = true;
3458                 ifmgd->assoc_data->need_beacon = false;
3459                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3460                         sdata->vif.bss_conf.sync_tsf =
3461                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3462                         sdata->vif.bss_conf.sync_device_ts =
3463                                 rx_status->device_timestamp;
3464                         if (elems.tim)
3465                                 sdata->vif.bss_conf.sync_dtim_count =
3466                                         elems.tim->dtim_count;
3467                         else
3468                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3469                 }
3470                 /* continue assoc process */
3471                 ifmgd->assoc_data->timeout = jiffies;
3472                 ifmgd->assoc_data->timeout_started = true;
3473                 run_again(sdata, ifmgd->assoc_data->timeout);
3474                 return;
3475         }
3476 
3477         if (!ifmgd->associated ||
3478             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3479                 return;
3480         bssid = ifmgd->associated->bssid;
3481 
3482         if (!(rx_status->flag & RX_FLAG_NO_SIGNAL_VAL))
3483                 ieee80211_handle_beacon_sig(sdata, ifmgd, bss_conf,
3484                                             local, rx_status);
3485 
3486         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3487                 mlme_dbg_ratelimited(sdata,
3488                                      "cancelling AP probe due to a received beacon\n");
3489                 ieee80211_reset_ap_probe(sdata);
3490         }
3491 
3492         /*
3493          * Push the beacon loss detection into the future since
3494          * we are processing a beacon from the AP just now.
3495          */
3496         ieee80211_sta_reset_beacon_monitor(sdata);
3497 
3498         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3499         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3500                                           len - baselen, false, &elems,
3501                                           care_about_ies, ncrc);
3502 
3503         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3504             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3505                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3506                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3507                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3508                                 ieee80211_hw_config(local,
3509                                                     IEEE80211_CONF_CHANGE_PS);
3510                         }
3511                         ieee80211_send_nullfunc(local, sdata, false);
3512                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3513                         local->pspolling = true;
3514 
3515                         /*
3516                          * Here is assumed that the driver will be
3517                          * able to send ps-poll frame and receive a
3518                          * response even though power save mode is
3519                          * enabled, but some drivers might require
3520                          * to disable power save here. This needs
3521                          * to be investigated.
3522                          */
3523                         ieee80211_send_pspoll(local, sdata);
3524                 }
3525         }
3526 
3527         if (sdata->vif.p2p ||
3528             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3529                 struct ieee80211_p2p_noa_attr noa = {};
3530                 int ret;
3531 
3532                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3533                                             len - baselen,
3534                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3535                                             (u8 *) &noa, sizeof(noa));
3536                 if (ret >= 2) {
3537                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3538                                 /* valid noa_attr and index changed */
3539                                 sdata->u.mgd.p2p_noa_index = noa.index;
3540                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3541                                 changed |= BSS_CHANGED_P2P_PS;
3542                                 /*
3543                                  * make sure we update all information, the CRC
3544                                  * mechanism doesn't look at P2P attributes.
3545                                  */
3546                                 ifmgd->beacon_crc_valid = false;
3547                         }
3548                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3549                         /* noa_attr not found and we had valid noa_attr before */
3550                         sdata->u.mgd.p2p_noa_index = -1;
3551                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3552                         changed |= BSS_CHANGED_P2P_PS;
3553                         ifmgd->beacon_crc_valid = false;
3554                 }
3555         }
3556 
3557         if (ifmgd->csa_waiting_bcn)
3558                 ieee80211_chswitch_post_beacon(sdata);
3559 
3560         /*
3561          * Update beacon timing and dtim count on every beacon appearance. This
3562          * will allow the driver to use the most updated values. Do it before
3563          * comparing this one with last received beacon.
3564          * IMPORTANT: These parameters would possibly be out of sync by the time
3565          * the driver will use them. The synchronized view is currently
3566          * guaranteed only in certain callbacks.
3567          */
3568         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3569                 sdata->vif.bss_conf.sync_tsf =
3570                         le64_to_cpu(mgmt->u.beacon.timestamp);
3571                 sdata->vif.bss_conf.sync_device_ts =
3572                         rx_status->device_timestamp;
3573                 if (elems.tim)
3574                         sdata->vif.bss_conf.sync_dtim_count =
3575                                 elems.tim->dtim_count;
3576                 else
3577                         sdata->vif.bss_conf.sync_dtim_count = 0;
3578         }
3579 
3580         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3581                 return;
3582         ifmgd->beacon_crc = ncrc;
3583         ifmgd->beacon_crc_valid = true;
3584 
3585         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3586 
3587         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3588                                          rx_status->device_timestamp,
3589                                          &elems, true);
3590 
3591         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3592             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3593                                      elems.wmm_param_len))
3594                 changed |= BSS_CHANGED_QOS;
3595 
3596         /*
3597          * If we haven't had a beacon before, tell the driver about the
3598          * DTIM period (and beacon timing if desired) now.
3599          */
3600         if (!ifmgd->have_beacon) {
3601                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3602                 if (elems.tim)
3603                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3604                 else
3605                         bss_conf->dtim_period = 1;
3606 
3607                 changed |= BSS_CHANGED_BEACON_INFO;
3608                 ifmgd->have_beacon = true;
3609 
3610                 mutex_lock(&local->iflist_mtx);
3611                 ieee80211_recalc_ps(local);
3612                 mutex_unlock(&local->iflist_mtx);
3613 
3614                 ieee80211_recalc_ps_vif(sdata);
3615         }
3616 
3617         if (elems.erp_info) {
3618                 erp_valid = true;
3619                 erp_value = elems.erp_info[0];
3620         } else {
3621                 erp_valid = false;
3622         }
3623         changed |= ieee80211_handle_bss_capability(sdata,
3624                         le16_to_cpu(mgmt->u.beacon.capab_info),
3625                         erp_valid, erp_value);
3626 
3627         mutex_lock(&local->sta_mtx);
3628         sta = sta_info_get(sdata, bssid);
3629 
3630         if (ieee80211_config_bw(sdata, sta,
3631                                 elems.ht_cap_elem, elems.ht_operation,
3632                                 elems.vht_operation, bssid, &changed)) {
3633                 mutex_unlock(&local->sta_mtx);
3634                 sdata_info(sdata,
3635                            "failed to follow AP %pM bandwidth change, disconnect\n",
3636                            bssid);
3637                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3638                                        WLAN_REASON_DEAUTH_LEAVING,
3639                                        true, deauth_buf);
3640                 ieee80211_report_disconnect(sdata, deauth_buf,
3641                                             sizeof(deauth_buf), true,
3642                                             WLAN_REASON_DEAUTH_LEAVING);
3643                 return;
3644         }
3645 
3646         if (sta && elems.opmode_notif)
3647                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3648                                             rx_status->band);
3649         mutex_unlock(&local->sta_mtx);
3650 
3651         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3652                                                elems.country_elem,
3653                                                elems.country_elem_len,
3654                                                elems.pwr_constr_elem,
3655                                                elems.cisco_dtpc_elem);
3656 
3657         ieee80211_bss_info_change_notify(sdata, changed);
3658 }
3659 
3660 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3661                                   struct sk_buff *skb)
3662 {
3663         struct ieee80211_rx_status *rx_status;
3664         struct ieee80211_mgmt *mgmt;
3665         u16 fc;
3666         struct ieee802_11_elems elems;
3667         int ies_len;
3668 
3669         rx_status = (struct ieee80211_rx_status *) skb->cb;
3670         mgmt = (struct ieee80211_mgmt *) skb->data;
3671         fc = le16_to_cpu(mgmt->frame_control);
3672 
3673         sdata_lock(sdata);
3674 
3675         switch (fc & IEEE80211_FCTL_STYPE) {
3676         case IEEE80211_STYPE_BEACON:
3677                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3678                 break;
3679         case IEEE80211_STYPE_PROBE_RESP:
3680                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3681                 break;
3682         case IEEE80211_STYPE_AUTH:
3683                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3684                 break;
3685         case IEEE80211_STYPE_DEAUTH:
3686                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3687                 break;
3688         case IEEE80211_STYPE_DISASSOC:
3689                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3690                 break;
3691         case IEEE80211_STYPE_ASSOC_RESP:
3692         case IEEE80211_STYPE_REASSOC_RESP:
3693                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3694                 break;
3695         case IEEE80211_STYPE_ACTION:
3696                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3697                         ies_len = skb->len -
3698                                   offsetof(struct ieee80211_mgmt,
3699                                            u.action.u.chan_switch.variable);
3700 
3701                         if (ies_len < 0)
3702                                 break;
3703 
3704                         ieee802_11_parse_elems(
3705                                 mgmt->u.action.u.chan_switch.variable,
3706                                 ies_len, true, &elems);
3707 
3708                         if (elems.parse_error)
3709                                 break;
3710 
3711                         ieee80211_sta_process_chanswitch(sdata,
3712                                                  rx_status->mactime,
3713                                                  rx_status->device_timestamp,
3714                                                  &elems, false);
3715                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3716                         ies_len = skb->len -
3717                                   offsetof(struct ieee80211_mgmt,
3718                                            u.action.u.ext_chan_switch.variable);
3719 
3720                         if (ies_len < 0)
3721                                 break;
3722 
3723                         ieee802_11_parse_elems(
3724                                 mgmt->u.action.u.ext_chan_switch.variable,
3725                                 ies_len, true, &elems);
3726 
3727                         if (elems.parse_error)
3728                                 break;
3729 
3730                         /* for the handling code pretend this was also an IE */
3731                         elems.ext_chansw_ie =
3732                                 &mgmt->u.action.u.ext_chan_switch.data;
3733 
3734                         ieee80211_sta_process_chanswitch(sdata,
3735                                                  rx_status->mactime,
3736                                                  rx_status->device_timestamp,
3737                                                  &elems, false);
3738                 }
3739                 break;
3740         }
3741         sdata_unlock(sdata);
3742 }
3743 
3744 static void ieee80211_sta_timer(struct timer_list *t)
3745 {
3746         struct ieee80211_sub_if_data *sdata =
3747                 from_timer(sdata, t, u.mgd.timer);
3748 
3749         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3750 }
3751 
3752 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3753                                           u8 *bssid, u8 reason, bool tx)
3754 {
3755         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3756 
3757         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3758                                tx, frame_buf);
3759 
3760         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3761                                     reason);
3762 }
3763 
3764 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3765 {
3766         struct ieee80211_local *local = sdata->local;
3767         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3768         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3769         u32 tx_flags = 0;
3770         u16 trans = 1;
3771         u16 status = 0;
3772 
3773         sdata_assert_lock(sdata);
3774 
3775         if (WARN_ON_ONCE(!auth_data))
3776                 return -EINVAL;
3777 
3778         auth_data->tries++;
3779 
3780         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3781                 sdata_info(sdata, "authentication with %pM timed out\n",
3782                            auth_data->bss->bssid);
3783 
3784                 /*
3785                  * Most likely AP is not in the range so remove the
3786                  * bss struct for that AP.
3787                  */
3788                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3789 
3790                 return -ETIMEDOUT;
3791         }
3792 
3793         drv_mgd_prepare_tx(local, sdata);
3794 
3795         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3796                    auth_data->bss->bssid, auth_data->tries,
3797                    IEEE80211_AUTH_MAX_TRIES);
3798 
3799         auth_data->expected_transaction = 2;
3800 
3801         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3802                 trans = auth_data->sae_trans;
3803                 status = auth_data->sae_status;
3804                 auth_data->expected_transaction = trans;
3805         }
3806 
3807         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3808                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3809                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3810 
3811         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3812                             auth_data->data, auth_data->data_len,
3813                             auth_data->bss->bssid,
3814                             auth_data->bss->bssid, NULL, 0, 0,
3815                             tx_flags);
3816 
3817         if (tx_flags == 0) {
3818                 if (auth_data->algorithm == WLAN_AUTH_SAE)
3819                         auth_data->timeout = jiffies +
3820                                 IEEE80211_AUTH_TIMEOUT_SAE;
3821                 else
3822                         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3823         } else {
3824                 auth_data->timeout =
3825                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3826         }
3827 
3828         auth_data->timeout_started = true;
3829         run_again(sdata, auth_data->timeout);
3830 
3831         return 0;
3832 }
3833 
3834 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3835 {
3836         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3837         struct ieee80211_local *local = sdata->local;
3838 
3839         sdata_assert_lock(sdata);
3840 
3841         assoc_data->tries++;
3842         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3843                 sdata_info(sdata, "association with %pM timed out\n",
3844                            assoc_data->bss->bssid);
3845 
3846                 /*
3847                  * Most likely AP is not in the range so remove the
3848                  * bss struct for that AP.
3849                  */
3850                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3851 
3852                 return -ETIMEDOUT;
3853         }
3854 
3855         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3856                    assoc_data->bss->bssid, assoc_data->tries,
3857                    IEEE80211_ASSOC_MAX_TRIES);
3858         ieee80211_send_assoc(sdata);
3859 
3860         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3861                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3862                 assoc_data->timeout_started = true;
3863                 run_again(sdata, assoc_data->timeout);
3864         } else {
3865                 assoc_data->timeout =
3866                         round_jiffies_up(jiffies +
3867                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3868                 assoc_data->timeout_started = true;
3869                 run_again(sdata, assoc_data->timeout);
3870         }
3871 
3872         return 0;
3873 }
3874 
3875 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3876                                   __le16 fc, bool acked)
3877 {
3878         struct ieee80211_local *local = sdata->local;
3879 
3880         sdata->u.mgd.status_fc = fc;
3881         sdata->u.mgd.status_acked = acked;
3882         sdata->u.mgd.status_received = true;
3883 
3884         ieee80211_queue_work(&local->hw, &sdata->work);
3885 }
3886 
3887 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3888 {
3889         struct ieee80211_local *local = sdata->local;
3890         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3891 
3892         sdata_lock(sdata);
3893 
3894         if (ifmgd->status_received) {
3895                 __le16 fc = ifmgd->status_fc;
3896                 bool status_acked = ifmgd->status_acked;
3897 
3898                 ifmgd->status_received = false;
3899                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3900                         if (status_acked) {
3901                                 if (ifmgd->auth_data->algorithm ==
3902                                     WLAN_AUTH_SAE)
3903                                         ifmgd->auth_data->timeout =
3904                                                 jiffies +
3905                                                 IEEE80211_AUTH_TIMEOUT_SAE;
3906                                 else
3907                                         ifmgd->auth_data->timeout =
3908                                                 jiffies +
3909                                                 IEEE80211_AUTH_TIMEOUT_SHORT;
3910                                 run_again(sdata, ifmgd->auth_data->timeout);
3911                         } else {
3912                                 ifmgd->auth_data->timeout = jiffies - 1;
3913                         }
3914                         ifmgd->auth_data->timeout_started = true;
3915                 } else if (ifmgd->assoc_data &&
3916                            (ieee80211_is_assoc_req(fc) ||
3917                             ieee80211_is_reassoc_req(fc))) {
3918                         if (status_acked) {
3919                                 ifmgd->assoc_data->timeout =
3920                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3921                                 run_again(sdata, ifmgd->assoc_data->timeout);
3922                         } else {
3923                                 ifmgd->assoc_data->timeout = jiffies - 1;
3924                         }
3925                         ifmgd->assoc_data->timeout_started = true;
3926                 }
3927         }
3928 
3929         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3930             time_after(jiffies, ifmgd->auth_data->timeout)) {
3931                 if (ifmgd->auth_data->done) {
3932                         /*
3933                          * ok ... we waited for assoc but userspace didn't,
3934                          * so let's just kill the auth data
3935                          */
3936                         ieee80211_destroy_auth_data(sdata, false);
3937                 } else if (ieee80211_auth(sdata)) {
3938                         u8 bssid[ETH_ALEN];
3939                         struct ieee80211_event event = {
3940                                 .type = MLME_EVENT,
3941                                 .u.mlme.data = AUTH_EVENT,
3942                                 .u.mlme.status = MLME_TIMEOUT,
3943                         };
3944 
3945                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3946 
3947                         ieee80211_destroy_auth_data(sdata, false);
3948 
3949                         cfg80211_auth_timeout(sdata->dev, bssid);
3950                         drv_event_callback(sdata->local, sdata, &event);
3951                 }
3952         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3953                 run_again(sdata, ifmgd->auth_data->timeout);
3954 
3955         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3956             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3957                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3958                     ieee80211_do_assoc(sdata)) {
3959                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3960                         struct ieee80211_event event = {
3961                                 .type = MLME_EVENT,
3962                                 .u.mlme.data = ASSOC_EVENT,
3963                                 .u.mlme.status = MLME_TIMEOUT,
3964                         };
3965 
3966                         ieee80211_destroy_assoc_data(sdata, false, false);
3967                         cfg80211_assoc_timeout(sdata->dev, bss);
3968                         drv_event_callback(sdata->local, sdata, &event);
3969                 }
3970         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3971                 run_again(sdata, ifmgd->assoc_data->timeout);
3972 
3973         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3974             ifmgd->associated) {
3975                 u8 bssid[ETH_ALEN];
3976                 int max_tries;
3977 
3978                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3979 
3980                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3981                         max_tries = max_nullfunc_tries;
3982                 else
3983                         max_tries = max_probe_tries;
3984 
3985                 /* ACK received for nullfunc probing frame */
3986                 if (!ifmgd->probe_send_count)
3987                         ieee80211_reset_ap_probe(sdata);
3988                 else if (ifmgd->nullfunc_failed) {
3989                         if (ifmgd->probe_send_count < max_tries) {
3990                                 mlme_dbg(sdata,
3991                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3992                                          bssid, ifmgd->probe_send_count,
3993                                          max_tries);
3994                                 ieee80211_mgd_probe_ap_send(sdata);
3995                         } else {
3996                                 mlme_dbg(sdata,
3997                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3998                                          bssid);
3999                                 ieee80211_sta_connection_lost(sdata, bssid,
4000                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
4001                                         false);
4002                         }
4003                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
4004                         run_again(sdata, ifmgd->probe_timeout);
4005                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
4006                         mlme_dbg(sdata,
4007                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
4008                                  bssid, probe_wait_ms);
4009                         ieee80211_sta_connection_lost(sdata, bssid,
4010                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4011                 } else if (ifmgd->probe_send_count < max_tries) {
4012                         mlme_dbg(sdata,
4013                                  "No probe response from AP %pM after %dms, try %d/%i\n",
4014                                  bssid, probe_wait_ms,
4015                                  ifmgd->probe_send_count, max_tries);
4016                         ieee80211_mgd_probe_ap_send(sdata);
4017                 } else {
4018                         /*
4019                          * We actually lost the connection ... or did we?
4020                          * Let's make sure!
4021                          */
4022                         mlme_dbg(sdata,
4023                                  "No probe response from AP %pM after %dms, disconnecting.\n",
4024                                  bssid, probe_wait_ms);
4025 
4026                         ieee80211_sta_connection_lost(sdata, bssid,
4027                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4028                 }
4029         }
4030 
4031         sdata_unlock(sdata);
4032 }
4033 
4034 static void ieee80211_sta_bcn_mon_timer(struct timer_list *t)
4035 {
4036         struct ieee80211_sub_if_data *sdata =
4037                 from_timer(sdata, t, u.mgd.bcn_mon_timer);
4038         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4039 
4040         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4041                 return;
4042 
4043         sdata->u.mgd.connection_loss = false;
4044         ieee80211_queue_work(&sdata->local->hw,
4045                              &sdata->u.mgd.beacon_connection_loss_work);
4046 }
4047 
4048 static void ieee80211_sta_conn_mon_timer(struct timer_list *t)
4049 {
4050         struct ieee80211_sub_if_data *sdata =
4051                 from_timer(sdata, t, u.mgd.conn_mon_timer);
4052         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4053         struct ieee80211_local *local = sdata->local;
4054 
4055         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4056                 return;
4057 
4058         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4059 }
4060 
4061 static void ieee80211_sta_monitor_work(struct work_struct *work)
4062 {
4063         struct ieee80211_sub_if_data *sdata =
4064                 container_of(work, struct ieee80211_sub_if_data,
4065                              u.mgd.monitor_work);
4066 
4067         ieee80211_mgd_probe_ap(sdata, false);
4068 }
4069 
4070 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4071 {
4072         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4073                 __ieee80211_stop_poll(sdata);
4074 
4075                 /* let's probe the connection once */
4076                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4077                         ieee80211_queue_work(&sdata->local->hw,
4078                                              &sdata->u.mgd.monitor_work);
4079         }
4080 }
4081 
4082 #ifdef CONFIG_PM
4083 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4084 {
4085         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4086         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4087 
4088         sdata_lock(sdata);
4089 
4090         if (ifmgd->auth_data || ifmgd->assoc_data) {
4091                 const u8 *bssid = ifmgd->auth_data ?
4092                                 ifmgd->auth_data->bss->bssid :
4093                                 ifmgd->assoc_data->bss->bssid;
4094 
4095                 /*
4096                  * If we are trying to authenticate / associate while suspending,
4097                  * cfg80211 won't know and won't actually abort those attempts,
4098                  * thus we need to do that ourselves.
4099                  */
4100                 ieee80211_send_deauth_disassoc(sdata, bssid,
4101                                                IEEE80211_STYPE_DEAUTH,
4102                                                WLAN_REASON_DEAUTH_LEAVING,
4103                                                false, frame_buf);
4104                 if (ifmgd->assoc_data)
4105                         ieee80211_destroy_assoc_data(sdata, false, true);
4106                 if (ifmgd->auth_data)
4107                         ieee80211_destroy_auth_data(sdata, false);
4108                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4109                                       IEEE80211_DEAUTH_FRAME_LEN);
4110         }
4111 
4112         /* This is a bit of a hack - we should find a better and more generic
4113          * solution to this. Normally when suspending, cfg80211 will in fact
4114          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4115          * auth (not so important) or assoc (this is the problem) process.
4116          *
4117          * As a consequence, it can happen that we are in the process of both
4118          * associating and suspending, and receive an association response
4119          * after cfg80211 has checked if it needs to disconnect, but before
4120          * we actually set the flag to drop incoming frames. This will then
4121          * cause the workqueue flush to process the association response in
4122          * the suspend, resulting in a successful association just before it
4123          * tries to remove the interface from the driver, which now though
4124          * has a channel context assigned ... this results in issues.
4125          *
4126          * To work around this (for now) simply deauth here again if we're
4127          * now connected.
4128          */
4129         if (ifmgd->associated && !sdata->local->wowlan) {
4130                 u8 bssid[ETH_ALEN];
4131                 struct cfg80211_deauth_request req = {
4132                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4133                         .bssid = bssid,
4134                 };
4135 
4136                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4137                 ieee80211_mgd_deauth(sdata, &req);
4138         }
4139 
4140         sdata_unlock(sdata);
4141 }
4142 
4143 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4144 {
4145         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4146 
4147         sdata_lock(sdata);
4148         if (!ifmgd->associated) {
4149                 sdata_unlock(sdata);
4150                 return;
4151         }
4152 
4153         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4154                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4155                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4156                 ieee80211_sta_connection_lost(sdata,
4157                                               ifmgd->associated->bssid,
4158                                               WLAN_REASON_UNSPECIFIED,
4159                                               true);
4160                 sdata_unlock(sdata);
4161                 return;
4162         }
4163         sdata_unlock(sdata);
4164 }
4165 #endif
4166 
4167 /* interface setup */
4168 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4169 {
4170         struct ieee80211_if_managed *ifmgd;
4171 
4172         ifmgd = &sdata->u.mgd;
4173         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4174         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4175         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4176                   ieee80211_beacon_connection_loss_work);
4177         INIT_WORK(&ifmgd->csa_connection_drop_work,
4178                   ieee80211_csa_connection_drop_work);
4179         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4180         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4181                           ieee80211_tdls_peer_del_work);
4182         timer_setup(&ifmgd->timer, ieee80211_sta_timer, 0);
4183         timer_setup(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 0);
4184         timer_setup(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 0);
4185         timer_setup(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 0);
4186         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4187                           ieee80211_sta_handle_tspec_ac_params_wk);
4188 
4189         ifmgd->flags = 0;
4190         ifmgd->powersave = sdata->wdev.ps;
4191         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4192         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4193         ifmgd->p2p_noa_index = -1;
4194 
4195         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4196                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4197         else
4198                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4199 
4200         /* Setup TDLS data */
4201         spin_lock_init(&ifmgd->teardown_lock);
4202         ifmgd->teardown_skb = NULL;
4203         ifmgd->orig_teardown_skb = NULL;
4204 }
4205 
4206 /* scan finished notification */
4207 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4208 {
4209         struct ieee80211_sub_if_data *sdata;
4210 
4211         /* Restart STA timers */
4212         rcu_read_lock();
4213         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4214                 if (ieee80211_sdata_running(sdata))
4215                         ieee80211_restart_sta_timer(sdata);
4216         }
4217         rcu_read_unlock();
4218 }
4219 
4220 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4221                                      struct cfg80211_bss *cbss)
4222 {
4223         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4224         const u8 *ht_cap_ie, *vht_cap_ie;
4225         const struct ieee80211_ht_cap *ht_cap;
4226         const struct ieee80211_vht_cap *vht_cap;
4227         u8 chains = 1;
4228 
4229         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4230                 return chains;
4231 
4232         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4233         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4234                 ht_cap = (void *)(ht_cap_ie + 2);
4235                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4236                 /*
4237                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4238                  *       "Tx Unequal Modulation Supported" fields.
4239                  */
4240         }
4241 
4242         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4243                 return chains;
4244 
4245         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4246         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4247                 u8 nss;
4248                 u16 tx_mcs_map;
4249 
4250                 vht_cap = (void *)(vht_cap_ie + 2);
4251                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4252                 for (nss = 8; nss > 0; nss--) {
4253                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4254                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4255                                 break;
4256                 }
4257                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4258                 chains = max(chains, nss);
4259         }
4260 
4261         return chains;
4262 }
4263 
4264 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4265                                   struct cfg80211_bss *cbss)
4266 {
4267         struct ieee80211_local *local = sdata->local;
4268         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4269         const struct ieee80211_ht_cap *ht_cap = NULL;
4270         const struct ieee80211_ht_operation *ht_oper = NULL;
4271         const struct ieee80211_vht_operation *vht_oper = NULL;
4272         struct ieee80211_supported_band *sband;
4273         struct cfg80211_chan_def chandef;
4274         int ret;
4275         u32 i;
4276         bool have_80mhz;
4277 
4278         sband = local->hw.wiphy->bands[cbss->channel->band];
4279 
4280         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4281                           IEEE80211_STA_DISABLE_80P80MHZ |
4282                           IEEE80211_STA_DISABLE_160MHZ);
4283 
4284         rcu_read_lock();
4285 
4286         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4287             sband->ht_cap.ht_supported) {
4288                 const u8 *ht_oper_ie, *ht_cap_ie;
4289 
4290                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4291                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4292                         ht_oper = (void *)(ht_oper_ie + 2);
4293 
4294                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4295                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4296                         ht_cap = (void *)(ht_cap_ie + 2);
4297 
4298                 if (!ht_cap) {
4299                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4300                         ht_oper = NULL;
4301                 }
4302         }
4303 
4304         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4305             sband->vht_cap.vht_supported) {
4306                 const u8 *vht_oper_ie, *vht_cap;
4307 
4308                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4309                                                    WLAN_EID_VHT_OPERATION);
4310                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4311                         vht_oper = (void *)(vht_oper_ie + 2);
4312                 if (vht_oper && !ht_oper) {
4313                         vht_oper = NULL;
4314                         sdata_info(sdata,
4315                                    "AP advertised VHT without HT, disabling both\n");
4316                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4317                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4318                 }
4319 
4320                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4321                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4322                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4323                         vht_oper = NULL;
4324                 }
4325         }
4326 
4327         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4328         have_80mhz = false;
4329         for (i = 0; i < sband->n_channels; i++) {
4330                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4331                                                 IEEE80211_CHAN_NO_80MHZ))
4332                         continue;
4333 
4334                 have_80mhz = true;
4335                 break;
4336         }
4337 
4338         if (!have_80mhz)
4339                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4340 
4341         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4342                                                      cbss->channel,
4343                                                      ht_oper, vht_oper,
4344                                                      &chandef, false);
4345 
4346         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4347                                       local->rx_chains);
4348 
4349         rcu_read_unlock();
4350 
4351         /* will change later if needed */
4352         sdata->smps_mode = IEEE80211_SMPS_OFF;
4353 
4354         mutex_lock(&local->mtx);
4355         /*
4356          * If this fails (possibly due to channel context sharing
4357          * on incompatible channels, e.g. 80+80 and 160 sharing the
4358          * same control channel) try to use a smaller bandwidth.
4359          */
4360         ret = ieee80211_vif_use_channel(sdata, &chandef,
4361                                         IEEE80211_CHANCTX_SHARED);
4362 
4363         /* don't downgrade for 5 and 10 MHz channels, though. */
4364         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4365             chandef.width == NL80211_CHAN_WIDTH_10)
4366                 goto out;
4367 
4368         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4369                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4370                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4371                                                 IEEE80211_CHANCTX_SHARED);
4372         }
4373  out:
4374         mutex_unlock(&local->mtx);
4375         return ret;
4376 }
4377 
4378 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4379                                      struct cfg80211_bss *cbss, bool assoc,
4380                                      bool override)
4381 {
4382         struct ieee80211_local *local = sdata->local;
4383         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4384         struct ieee80211_bss *bss = (void *)cbss->priv;
4385         struct sta_info *new_sta = NULL;
4386         struct ieee80211_supported_band *sband;
4387         bool have_sta = false;
4388         int err;
4389 
4390         sband = local->hw.wiphy->bands[cbss->channel->band];
4391 
4392         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4393                 return -EINVAL;
4394 
4395         /* If a reconfig is happening, bail out */
4396         if (local->in_reconfig)
4397                 return -EBUSY;
4398 
4399         if (assoc) {
4400                 rcu_read_lock();
4401                 have_sta = sta_info_get(sdata, cbss->bssid);
4402                 rcu_read_unlock();
4403         }
4404 
4405         if (!have_sta) {
4406                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4407                 if (!new_sta)
4408                         return -ENOMEM;
4409         }
4410 
4411         /*
4412          * Set up the information for the new channel before setting the
4413          * new channel. We can't - completely race-free - change the basic
4414          * rates bitmap and the channel (sband) that it refers to, but if
4415          * we set it up before we at least avoid calling into the driver's
4416          * bss_info_changed() method with invalid information (since we do
4417          * call that from changing the channel - only for IDLE and perhaps
4418          * some others, but ...).
4419          *
4420          * So to avoid that, just set up all the new information before the
4421          * channel, but tell the driver to apply it only afterwards, since
4422          * it might need the new channel for that.
4423          */
4424         if (new_sta) {
4425                 u32 rates = 0, basic_rates = 0;
4426                 bool have_higher_than_11mbit;
4427                 int min_rate = INT_MAX, min_rate_index = -1;
4428                 const struct cfg80211_bss_ies *ies;
4429                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4430 
4431                 ieee80211_get_rates(sband, bss->supp_rates,
4432                                     bss->supp_rates_len,
4433                                     &rates, &basic_rates,
4434                                     &have_higher_than_11mbit,
4435                                     &min_rate, &min_rate_index,
4436                                     shift);
4437 
4438                 /*
4439                  * This used to be a workaround for basic rates missing
4440                  * in the association response frame. Now that we no
4441                  * longer use the basic rates from there, it probably
4442                  * doesn't happen any more, but keep the workaround so
4443                  * in case some *other* APs are buggy in different ways
4444                  * we can connect -- with a warning.
4445                  */
4446                 if (!basic_rates && min_rate_index >= 0) {
4447                         sdata_info(sdata,
4448                                    "No basic rates, using min rate instead\n");
4449                         basic_rates = BIT(min_rate_index);
4450                 }
4451 
4452                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4453                 sdata->vif.bss_conf.basic_rates = basic_rates;
4454 
4455                 /* cf. IEEE 802.11 9.2.12 */
4456                 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4457                     have_higher_than_11mbit)
4458                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4459                 else
4460                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4461 
4462                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4463 
4464                 /* set timing information */
4465                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4466                 rcu_read_lock();
4467                 ies = rcu_dereference(cbss->beacon_ies);
4468                 if (ies) {
4469                         const u8 *tim_ie;
4470 
4471                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4472                         sdata->vif.bss_conf.sync_device_ts =
4473                                 bss->device_ts_beacon;
4474                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4475                                                   ies->data, ies->len);
4476                         if (tim_ie && tim_ie[1] >= 2)
4477                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4478                         else
4479                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4480                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4481                                                TIMING_BEACON_ONLY)) {
4482                         ies = rcu_dereference(cbss->proberesp_ies);
4483                         /* must be non-NULL since beacon IEs were NULL */
4484                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4485                         sdata->vif.bss_conf.sync_device_ts =
4486                                 bss->device_ts_presp;
4487                         sdata->vif.bss_conf.sync_dtim_count = 0;
4488                 } else {
4489                         sdata->vif.bss_conf.sync_tsf = 0;
4490                         sdata->vif.bss_conf.sync_device_ts = 0;
4491                         sdata->vif.bss_conf.sync_dtim_count = 0;
4492                 }
4493                 rcu_read_unlock();
4494         }
4495 
4496         if (new_sta || override) {
4497                 err = ieee80211_prep_channel(sdata, cbss);
4498                 if (err) {
4499                         if (new_sta)
4500                                 sta_info_free(local, new_sta);
4501                         return -EINVAL;
4502                 }
4503         }
4504 
4505         if (new_sta) {
4506                 /*
4507                  * tell driver about BSSID, basic rates and timing
4508                  * this was set up above, before setting the channel
4509                  */
4510                 ieee80211_bss_info_change_notify(sdata,
4511                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4512                         BSS_CHANGED_BEACON_INT);
4513 
4514                 if (assoc)
4515                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4516 
4517                 err = sta_info_insert(new_sta);
4518                 new_sta = NULL;
4519                 if (err) {
4520                         sdata_info(sdata,
4521                                    "failed to insert STA entry for the AP (error %d)\n",
4522                                    err);
4523                         return err;
4524                 }
4525         } else
4526                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4527 
4528         /* Cancel scan to ensure that nothing interferes with connection */
4529         if (local->scanning)
4530                 ieee80211_scan_cancel(local);
4531 
4532         return 0;
4533 }
4534 
4535 /* config hooks */
4536 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4537                        struct cfg80211_auth_request *req)
4538 {
4539         struct ieee80211_local *local = sdata->local;
4540         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4541         struct ieee80211_mgd_auth_data *auth_data;
4542         u16 auth_alg;
4543         int err;
4544 
4545         /* prepare auth data structure */
4546 
4547         switch (req->auth_type) {
4548         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4549                 auth_alg = WLAN_AUTH_OPEN;
4550                 break;
4551         case NL80211_AUTHTYPE_SHARED_KEY:
4552                 if (IS_ERR(local->wep_tx_tfm))
4553                         return -EOPNOTSUPP;
4554                 auth_alg = WLAN_AUTH_SHARED_KEY;
4555                 break;
4556         case NL80211_AUTHTYPE_FT:
4557                 auth_alg = WLAN_AUTH_FT;
4558                 break;
4559         case NL80211_AUTHTYPE_NETWORK_EAP:
4560                 auth_alg = WLAN_AUTH_LEAP;
4561                 break;
4562         case NL80211_AUTHTYPE_SAE:
4563                 auth_alg = WLAN_AUTH_SAE;
4564                 break;
4565         case NL80211_AUTHTYPE_FILS_SK:
4566                 auth_alg = WLAN_AUTH_FILS_SK;
4567                 break;
4568         case NL80211_AUTHTYPE_FILS_SK_PFS:
4569                 auth_alg = WLAN_AUTH_FILS_SK_PFS;
4570                 break;
4571         case NL80211_AUTHTYPE_FILS_PK:
4572                 auth_alg = WLAN_AUTH_FILS_PK;
4573                 break;
4574         default:
4575                 return -EOPNOTSUPP;
4576         }
4577 
4578         auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4579                             req->ie_len, GFP_KERNEL);
4580         if (!auth_data)
4581                 return -ENOMEM;
4582 
4583         auth_data->bss = req->bss;
4584 
4585         if (req->auth_data_len >= 4) {
4586                 if (req->auth_type == NL80211_AUTHTYPE_SAE) {
4587                         __le16 *pos = (__le16 *) req->auth_data;
4588 
4589                         auth_data->sae_trans = le16_to_cpu(pos[0]);
4590                         auth_data->sae_status = le16_to_cpu(pos[1]);
4591                 }
4592                 memcpy(auth_data->data, req->auth_data + 4,
4593                        req->auth_data_len - 4);
4594                 auth_data->data_len += req->auth_data_len - 4;
4595         }
4596 
4597         if (req->ie && req->ie_len) {
4598                 memcpy(&auth_data->data[auth_data->data_len],
4599                        req->ie, req->ie_len);
4600                 auth_data->data_len += req->ie_len;
4601         }
4602 
4603         if (req->key && req->key_len) {
4604                 auth_data->key_len = req->key_len;
4605                 auth_data->key_idx = req->key_idx;
4606                 memcpy(auth_data->key, req->key, req->key_len);
4607         }
4608 
4609         auth_data->algorithm = auth_alg;
4610 
4611         /* try to authenticate/probe */
4612 
4613         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4614             ifmgd->assoc_data) {
4615                 err = -EBUSY;
4616                 goto err_free;
4617         }
4618 
4619         if (ifmgd->auth_data)
4620                 ieee80211_destroy_auth_data(sdata, false);
4621 
4622         /* prep auth_data so we don't go into idle on disassoc */
4623         ifmgd->auth_data = auth_data;
4624 
4625         if (ifmgd->associated) {
4626                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4627 
4628                 sdata_info(sdata,
4629                            "disconnect from AP %pM for new auth to %pM\n",
4630                            ifmgd->associated->bssid, req->bss->bssid);
4631                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4632                                        WLAN_REASON_UNSPECIFIED,
4633                                        false, frame_buf);
4634 
4635                 ieee80211_report_disconnect(sdata, frame_buf,
4636                                             sizeof(frame_buf), true,
4637                                             WLAN_REASON_UNSPECIFIED);
4638         }
4639 
4640         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4641 
4642         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4643         if (err)
4644                 goto err_clear;
4645 
4646         err = ieee80211_auth(sdata);
4647         if (err) {
4648                 sta_info_destroy_addr(sdata, req->bss->bssid);
4649                 goto err_clear;
4650         }
4651 
4652         /* hold our own reference */
4653         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4654         return 0;
4655 
4656  err_clear:
4657         eth_zero_addr(ifmgd->bssid);
4658         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4659         ifmgd->auth_data = NULL;
4660         mutex_lock(&sdata->local->mtx);
4661         ieee80211_vif_release_channel(sdata);
4662         mutex_unlock(&sdata->local->mtx);
4663  err_free:
4664         kfree(auth_data);
4665         return err;
4666 }
4667 
4668 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4669                         struct cfg80211_assoc_request *req)
4670 {
4671         struct ieee80211_local *local = sdata->local;
4672         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4673         struct ieee80211_bss *bss = (void *)req->bss->priv;
4674         struct ieee80211_mgd_assoc_data *assoc_data;
4675         const struct cfg80211_bss_ies *beacon_ies;
4676         struct ieee80211_supported_band *sband;
4677         const u8 *ssidie, *ht_ie, *vht_ie;
4678         int i, err;
4679         bool override = false;
4680 
4681         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4682         if (!assoc_data)
4683                 return -ENOMEM;
4684 
4685         rcu_read_lock();
4686         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4687         if (!ssidie) {
4688                 rcu_read_unlock();
4689                 kfree(assoc_data);
4690                 return -EINVAL;
4691         }
4692         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4693         assoc_data->ssid_len = ssidie[1];
4694         rcu_read_unlock();
4695 
4696         if (ifmgd->associated) {
4697                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4698 
4699                 sdata_info(sdata,
4700                            "disconnect from AP %pM for new assoc to %pM\n",
4701                            ifmgd->associated->bssid, req->bss->bssid);
4702                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4703                                        WLAN_REASON_UNSPECIFIED,
4704                                        false, frame_buf);
4705 
4706                 ieee80211_report_disconnect(sdata, frame_buf,
4707                                             sizeof(frame_buf), true,
4708                                             WLAN_REASON_UNSPECIFIED);
4709         }
4710 
4711         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4712                 err = -EBUSY;
4713                 goto err_free;
4714         }
4715 
4716         if (ifmgd->assoc_data) {
4717                 err = -EBUSY;
4718                 goto err_free;
4719         }
4720 
4721         if (ifmgd->auth_data) {
4722                 bool match;
4723 
4724                 /* keep sta info, bssid if matching */
4725                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4726                 ieee80211_destroy_auth_data(sdata, match);
4727         }
4728 
4729         /* prepare assoc data */
4730 
4731         ifmgd->beacon_crc_valid = false;
4732 
4733         assoc_data->wmm = bss->wmm_used &&
4734                           (local->hw.queues >= IEEE80211_NUM_ACS);
4735 
4736         /*
4737          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4738          * We still associate in non-HT mode (11a/b/g) if any one of these
4739          * ciphers is configured as pairwise.
4740          * We can set this to true for non-11n hardware, that'll be checked
4741          * separately along with the peer capabilities.
4742          */
4743         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4744                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4745                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4746                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4747                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4748                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4749                         netdev_info(sdata->dev,
4750                                     "disabling HT/VHT due to WEP/TKIP use\n");
4751                 }
4752         }
4753 
4754         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4755         sband = local->hw.wiphy->bands[req->bss->channel->band];
4756         if (!sband->ht_cap.ht_supported ||
4757             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4758             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4759                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4760                 if (!bss->wmm_used &&
4761                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4762                         netdev_info(sdata->dev,
4763                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4764         }
4765 
4766         /* disable VHT if we don't support it or the AP doesn't use WMM */
4767         if (!sband->vht_cap.vht_supported ||
4768             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4769             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4770                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4771                 if (!bss->wmm_used &&
4772                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4773                         netdev_info(sdata->dev,
4774                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4775         }
4776 
4777         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4778         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4779                sizeof(ifmgd->ht_capa_mask));
4780 
4781         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4782         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4783                sizeof(ifmgd->vht_capa_mask));
4784 
4785         if (req->ie && req->ie_len) {
4786                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4787                 assoc_data->ie_len = req->ie_len;
4788         }
4789 
4790         if (req->fils_kek) {
4791                 /* should already be checked in cfg80211 - so warn */
4792                 if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
4793                         err = -EINVAL;
4794                         goto err_free;
4795                 }
4796                 memcpy(assoc_data->fils_kek, req->fils_kek,
4797                        req->fils_kek_len);
4798                 assoc_data->fils_kek_len = req->fils_kek_len;
4799         }
4800 
4801         if (req->fils_nonces)
4802                 memcpy(assoc_data->fils_nonces, req->fils_nonces,
4803                        2 * FILS_NONCE_LEN);
4804 
4805         assoc_data->bss = req->bss;
4806 
4807         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4808                 if (ifmgd->powersave)
4809                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4810                 else
4811                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4812         } else
4813                 sdata->smps_mode = ifmgd->req_smps;
4814 
4815         assoc_data->capability = req->bss->capability;
4816         assoc_data->supp_rates = bss->supp_rates;
4817         assoc_data->supp_rates_len = bss->supp_rates_len;
4818 
4819         rcu_read_lock();
4820         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4821         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4822                 assoc_data->ap_ht_param =
4823                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4824         else
4825                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4826         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4827         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4828                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4829                        sizeof(struct ieee80211_vht_cap));
4830         else
4831                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4832         rcu_read_unlock();
4833 
4834         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4835                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4836              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4837                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4838 
4839         if (bss->wmm_used && bss->uapsd_supported &&
4840             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4841                 assoc_data->uapsd = true;
4842                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4843         } else {
4844                 assoc_data->uapsd = false;
4845                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4846         }
4847 
4848         if (req->prev_bssid)
4849                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4850 
4851         if (req->use_mfp) {
4852                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4853                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4854         } else {
4855                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4856                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4857         }
4858 
4859         if (req->flags & ASSOC_REQ_USE_RRM)
4860                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4861         else
4862                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4863 
4864         if (req->crypto.control_port)
4865                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4866         else
4867                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4868 
4869         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4870         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4871         sdata->control_port_over_nl80211 =
4872                                         req->crypto.control_port_over_nl80211;
4873         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4874                                                         sdata->vif.type);
4875 
4876         /* kick off associate process */
4877 
4878         ifmgd->assoc_data = assoc_data;
4879         ifmgd->dtim_period = 0;
4880         ifmgd->have_beacon = false;
4881 
4882         /* override HT/VHT configuration only if the AP and we support it */
4883         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4884                 struct ieee80211_sta_ht_cap sta_ht_cap;
4885 
4886                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4887                         override = true;
4888 
4889                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4890                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4891 
4892                 /* check for 40 MHz disable override */
4893                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4894                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4895                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4896                         override = true;
4897 
4898                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4899                     req->flags & ASSOC_REQ_DISABLE_VHT)
4900                         override = true;
4901         }
4902 
4903         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4904                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4905                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4906         }
4907 
4908         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4909                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4910 
4911         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4912         if (err)
4913                 goto err_clear;
4914 
4915         rcu_read_lock();
4916         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4917 
4918         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4919             !beacon_ies) {
4920                 /*
4921                  * Wait up to one beacon interval ...
4922                  * should this be more if we miss one?
4923                  */
4924                 sdata_info(sdata, "waiting for beacon from %pM\n",
4925                            ifmgd->bssid);
4926                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4927                 assoc_data->timeout_started = true;
4928                 assoc_data->need_beacon = true;
4929         } else if (beacon_ies) {
4930                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4931                                                     beacon_ies->data,
4932                                                     beacon_ies->len);
4933                 u8 dtim_count = 0;
4934 
4935                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4936                         const struct ieee80211_tim_ie *tim;
4937                         tim = (void *)(tim_ie + 2);
4938                         ifmgd->dtim_period = tim->dtim_period;
4939                         dtim_count = tim->dtim_count;
4940                 }
4941                 ifmgd->have_beacon = true;
4942                 assoc_data->timeout = jiffies;
4943                 assoc_data->timeout_started = true;
4944 
4945                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4946                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4947                         sdata->vif.bss_conf.sync_device_ts =
4948                                 bss->device_ts_beacon;
4949                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4950                 }
4951         } else {
4952                 assoc_data->timeout = jiffies;
4953                 assoc_data->timeout_started = true;
4954         }
4955         rcu_read_unlock();
4956 
4957         run_again(sdata, assoc_data->timeout);
4958 
4959         if (bss->corrupt_data) {
4960                 char *corrupt_type = "data";
4961                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4962                         if (bss->corrupt_data &
4963                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4964                                 corrupt_type = "beacon and probe response";
4965                         else
4966                                 corrupt_type = "beacon";
4967                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4968                         corrupt_type = "probe response";
4969                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4970                            corrupt_type);
4971         }
4972 
4973         return 0;
4974  err_clear:
4975         eth_zero_addr(ifmgd->bssid);
4976         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4977         ifmgd->assoc_data = NULL;
4978  err_free:
4979         kfree(assoc_data);
4980         return err;
4981 }
4982 
4983 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4984                          struct cfg80211_deauth_request *req)
4985 {
4986         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4987         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4988         bool tx = !req->local_state_change;
4989 
4990         if (ifmgd->auth_data &&
4991             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4992                 sdata_info(sdata,
4993                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4994                            req->bssid, req->reason_code,
4995                            ieee80211_get_reason_code_string(req->reason_code));
4996 
4997                 drv_mgd_prepare_tx(sdata->local, sdata);
4998                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4999                                                IEEE80211_STYPE_DEAUTH,
5000                                                req->reason_code, tx,
5001                                                frame_buf);
5002                 ieee80211_destroy_auth_data(sdata, false);
5003                 ieee80211_report_disconnect(sdata, frame_buf,
5004                                             sizeof(frame_buf), true,
5005                                             req->reason_code);
5006 
5007                 return 0;
5008         }
5009 
5010         if (ifmgd->assoc_data &&
5011             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
5012                 sdata_info(sdata,
5013                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
5014                            req->bssid, req->reason_code,
5015                            ieee80211_get_reason_code_string(req->reason_code));
5016 
5017                 drv_mgd_prepare_tx(sdata->local, sdata);
5018                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
5019                                                IEEE80211_STYPE_DEAUTH,
5020                                                req->reason_code, tx,
5021                                                frame_buf);
5022                 ieee80211_destroy_assoc_data(sdata, false, true);
5023                 ieee80211_report_disconnect(sdata, frame_buf,
5024                                             sizeof(frame_buf), true,
5025                                             req->reason_code);
5026                 return 0;
5027         }
5028 
5029         if (ifmgd->associated &&
5030             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5031                 sdata_info(sdata,
5032                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
5033                            req->bssid, req->reason_code,
5034                            ieee80211_get_reason_code_string(req->reason_code));
5035 
5036                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5037                                        req->reason_code, tx, frame_buf);
5038                 ieee80211_report_disconnect(sdata, frame_buf,
5039                                             sizeof(frame_buf), true,
5040                                             req->reason_code);
5041                 return 0;
5042         }
5043 
5044         return -ENOTCONN;
5045 }
5046 
5047 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5048                            struct cfg80211_disassoc_request *req)
5049 {
5050         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5051         u8 bssid[ETH_ALEN];
5052         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5053 
5054         /*
5055          * cfg80211 should catch this ... but it's racy since
5056          * we can receive a disassoc frame, process it, hand it
5057          * to cfg80211 while that's in a locked section already
5058          * trying to tell us that the user wants to disconnect.
5059          */
5060         if (ifmgd->associated != req->bss)
5061                 return -ENOLINK;
5062 
5063         sdata_info(sdata,
5064                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5065                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5066 
5067         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5068         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5069                                req->reason_code, !req->local_state_change,
5070                                frame_buf);
5071 
5072         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5073                                     req->reason_code);
5074 
5075         return 0;
5076 }
5077 
5078 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5079 {
5080         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5081 
5082         /*
5083          * Make sure some work items will not run after this,
5084          * they will not do anything but might not have been
5085          * cancelled when disconnecting.
5086          */
5087         cancel_work_sync(&ifmgd->monitor_work);
5088         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5089         cancel_work_sync(&ifmgd->request_smps_work);
5090         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5091         cancel_work_sync(&ifmgd->chswitch_work);
5092         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5093 
5094         sdata_lock(sdata);
5095         if (ifmgd->assoc_data) {
5096                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5097                 ieee80211_destroy_assoc_data(sdata, false, false);
5098                 cfg80211_assoc_timeout(sdata->dev, bss);
5099         }
5100         if (ifmgd->auth_data)
5101                 ieee80211_destroy_auth_data(sdata, false);
5102         spin_lock_bh(&ifmgd->teardown_lock);
5103         if (ifmgd->teardown_skb) {
5104                 kfree_skb(ifmgd->teardown_skb);
5105                 ifmgd->teardown_skb = NULL;
5106                 ifmgd->orig_teardown_skb = NULL;
5107         }
5108         spin_unlock_bh(&ifmgd->teardown_lock);
5109         del_timer_sync(&ifmgd->timer);
5110         sdata_unlock(sdata);
5111 }
5112 
5113 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5114                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5115                                s32 rssi_level,
5116                                gfp_t gfp)
5117 {
5118         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5119 
5120         trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level);
5121 
5122         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp);
5123 }
5124 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5125 
5126 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5127 {
5128         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5129 
5130         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5131 
5132         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5133 }
5134 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);
5135 

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