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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  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  */
 13 
 14 #include <linux/delay.h>
 15 #include <linux/if_ether.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/if_arp.h>
 18 #include <linux/etherdevice.h>
 19 #include <linux/moduleparam.h>
 20 #include <linux/rtnetlink.h>
 21 #include <linux/pm_qos.h>
 22 #include <linux/crc32.h>
 23 #include <linux/slab.h>
 24 #include <linux/export.h>
 25 #include <net/mac80211.h>
 26 #include <asm/unaligned.h>
 27 
 28 #include "ieee80211_i.h"
 29 #include "driver-ops.h"
 30 #include "rate.h"
 31 #include "led.h"
 32 
 33 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
 34 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
 35 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
 36 #define IEEE80211_AUTH_MAX_TRIES        3
 37 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
 38 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
 39 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
 40 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
 41 #define IEEE80211_ASSOC_MAX_TRIES       3
 42 
 43 static int max_nullfunc_tries = 2;
 44 module_param(max_nullfunc_tries, int, 0644);
 45 MODULE_PARM_DESC(max_nullfunc_tries,
 46                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
 47 
 48 static int max_probe_tries = 5;
 49 module_param(max_probe_tries, int, 0644);
 50 MODULE_PARM_DESC(max_probe_tries,
 51                  "Maximum probe tries before disconnecting (reason 4).");
 52 
 53 /*
 54  * Beacon loss timeout is calculated as N frames times the
 55  * advertised beacon interval.  This may need to be somewhat
 56  * higher than what hardware might detect to account for
 57  * delays in the host processing frames. But since we also
 58  * probe on beacon miss before declaring the connection lost
 59  * default to what we want.
 60  */
 61 static int beacon_loss_count = 7;
 62 module_param(beacon_loss_count, int, 0644);
 63 MODULE_PARM_DESC(beacon_loss_count,
 64                  "Number of beacon intervals before we decide beacon was lost.");
 65 
 66 /*
 67  * Time the connection can be idle before we probe
 68  * it to see if we can still talk to the AP.
 69  */
 70 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
 71 /*
 72  * Time we wait for a probe response after sending
 73  * a probe request because of beacon loss or for
 74  * checking the connection still works.
 75  */
 76 static int probe_wait_ms = 500;
 77 module_param(probe_wait_ms, int, 0644);
 78 MODULE_PARM_DESC(probe_wait_ms,
 79                  "Maximum time(ms) to wait for probe response"
 80                  " before disconnecting (reason 4).");
 81 
 82 /*
 83  * Weight given to the latest Beacon frame when calculating average signal
 84  * strength for Beacon frames received in the current BSS. This must be
 85  * between 1 and 15.
 86  */
 87 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
 88 
 89 /*
 90  * How many Beacon frames need to have been used in average signal strength
 91  * before starting to indicate signal change events.
 92  */
 93 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
 94 
 95 /*
 96  * We can have multiple work items (and connection probing)
 97  * scheduling this timer, but we need to take care to only
 98  * reschedule it when it should fire _earlier_ than it was
 99  * asked for before, or if it's not pending right now. This
100  * function ensures that. Note that it then is required to
101  * run this function for all timeouts after the first one
102  * has happened -- the work that runs from this timer will
103  * do that.
104  */
105 static void run_again(struct ieee80211_sub_if_data *sdata,
106                       unsigned long timeout)
107 {
108         sdata_assert_lock(sdata);
109 
110         if (!timer_pending(&sdata->u.mgd.timer) ||
111             time_before(timeout, sdata->u.mgd.timer.expires))
112                 mod_timer(&sdata->u.mgd.timer, timeout);
113 }
114 
115 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
116 {
117         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
118                 return;
119 
120         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
121                 return;
122 
123         mod_timer(&sdata->u.mgd.bcn_mon_timer,
124                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
125 }
126 
127 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
128 {
129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
130 
131         if (unlikely(!sdata->u.mgd.associated))
132                 return;
133 
134         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
135                 return;
136 
137         mod_timer(&sdata->u.mgd.conn_mon_timer,
138                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
139 
140         ifmgd->probe_send_count = 0;
141 }
142 
143 static int ecw2cw(int ecw)
144 {
145         return (1 << ecw) - 1;
146 }
147 
148 static u32
149 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
150                              struct ieee80211_supported_band *sband,
151                              struct ieee80211_channel *channel,
152                              const struct ieee80211_ht_operation *ht_oper,
153                              const struct ieee80211_vht_operation *vht_oper,
154                              struct cfg80211_chan_def *chandef, bool tracking)
155 {
156         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
157         struct cfg80211_chan_def vht_chandef;
158         u32 ht_cfreq, ret;
159 
160         chandef->chan = channel;
161         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
162         chandef->center_freq1 = channel->center_freq;
163         chandef->center_freq2 = 0;
164 
165         if (!ht_oper || !sband->ht_cap.ht_supported) {
166                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
167                 goto out;
168         }
169 
170         chandef->width = NL80211_CHAN_WIDTH_20;
171 
172         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
173                                                   channel->band);
174         /* check that channel matches the right operating channel */
175         if (!tracking && channel->center_freq != ht_cfreq) {
176                 /*
177                  * It's possible that some APs are confused here;
178                  * Netgear WNDR3700 sometimes reports 4 higher than
179                  * the actual channel in association responses, but
180                  * since we look at probe response/beacon data here
181                  * it should be OK.
182                  */
183                 sdata_info(sdata,
184                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
185                            channel->center_freq, ht_cfreq,
186                            ht_oper->primary_chan, channel->band);
187                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
188                 goto out;
189         }
190 
191         /* check 40 MHz support, if we have it */
192         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
193                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
194                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
195                         chandef->width = NL80211_CHAN_WIDTH_40;
196                         chandef->center_freq1 += 10;
197                         break;
198                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
199                         chandef->width = NL80211_CHAN_WIDTH_40;
200                         chandef->center_freq1 -= 10;
201                         break;
202                 }
203         } else {
204                 /* 40 MHz (and 80 MHz) must be supported for VHT */
205                 ret = IEEE80211_STA_DISABLE_VHT;
206                 /* also mark 40 MHz disabled */
207                 ret |= IEEE80211_STA_DISABLE_40MHZ;
208                 goto out;
209         }
210 
211         if (!vht_oper || !sband->vht_cap.vht_supported) {
212                 ret = IEEE80211_STA_DISABLE_VHT;
213                 goto out;
214         }
215 
216         vht_chandef.chan = channel;
217         vht_chandef.center_freq1 =
218                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
219                                                channel->band);
220         vht_chandef.center_freq2 = 0;
221 
222         switch (vht_oper->chan_width) {
223         case IEEE80211_VHT_CHANWIDTH_USE_HT:
224                 vht_chandef.width = chandef->width;
225                 vht_chandef.center_freq1 = chandef->center_freq1;
226                 break;
227         case IEEE80211_VHT_CHANWIDTH_80MHZ:
228                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
229                 break;
230         case IEEE80211_VHT_CHANWIDTH_160MHZ:
231                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
232                 break;
233         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
234                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
235                 vht_chandef.center_freq2 =
236                         ieee80211_channel_to_frequency(
237                                 vht_oper->center_freq_seg2_idx,
238                                 channel->band);
239                 break;
240         default:
241                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
242                         sdata_info(sdata,
243                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
244                                    vht_oper->chan_width);
245                 ret = IEEE80211_STA_DISABLE_VHT;
246                 goto out;
247         }
248 
249         if (!cfg80211_chandef_valid(&vht_chandef)) {
250                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
251                         sdata_info(sdata,
252                                    "AP VHT information is invalid, disable VHT\n");
253                 ret = IEEE80211_STA_DISABLE_VHT;
254                 goto out;
255         }
256 
257         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
258                 ret = 0;
259                 goto out;
260         }
261 
262         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
263                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
264                         sdata_info(sdata,
265                                    "AP VHT information doesn't match HT, disable VHT\n");
266                 ret = IEEE80211_STA_DISABLE_VHT;
267                 goto out;
268         }
269 
270         *chandef = vht_chandef;
271 
272         ret = 0;
273 
274 out:
275         /*
276          * When tracking the current AP, don't do any further checks if the
277          * new chandef is identical to the one we're currently using for the
278          * connection. This keeps us from playing ping-pong with regulatory,
279          * without it the following can happen (for example):
280          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
281          *  - AP advertises regdom US
282          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
283          *  - the code below detects an unsupported channel, downgrades, and
284          *    we disconnect from the AP in the caller
285          *  - disconnect causes CRDA to reload world regdomain and the game
286          *    starts anew.
287          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
288          *
289          * It seems possible that there are still scenarios with CSA or real
290          * bandwidth changes where a this could happen, but those cases are
291          * less common and wouldn't completely prevent using the AP.
292          */
293         if (tracking &&
294             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
295                 return ret;
296 
297         /* don't print the message below for VHT mismatch if VHT is disabled */
298         if (ret & IEEE80211_STA_DISABLE_VHT)
299                 vht_chandef = *chandef;
300 
301         /*
302          * Ignore the DISABLED flag when we're already connected and only
303          * tracking the APs beacon for bandwidth changes - otherwise we
304          * might get disconnected here if we connect to an AP, update our
305          * regulatory information based on the AP's country IE and the
306          * information we have is wrong/outdated and disables the channel
307          * that we're actually using for the connection to the AP.
308          */
309         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
310                                         tracking ? 0 :
311                                                    IEEE80211_CHAN_DISABLED)) {
312                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
313                         ret = IEEE80211_STA_DISABLE_HT |
314                               IEEE80211_STA_DISABLE_VHT;
315                         break;
316                 }
317 
318                 ret |= ieee80211_chandef_downgrade(chandef);
319         }
320 
321         if (chandef->width != vht_chandef.width && !tracking)
322                 sdata_info(sdata,
323                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
324 
325         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
326         return ret;
327 }
328 
329 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
330                                struct sta_info *sta,
331                                const struct ieee80211_ht_operation *ht_oper,
332                                const struct ieee80211_vht_operation *vht_oper,
333                                const u8 *bssid, u32 *changed)
334 {
335         struct ieee80211_local *local = sdata->local;
336         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
337         struct ieee80211_supported_band *sband;
338         struct ieee80211_channel *chan;
339         struct cfg80211_chan_def chandef;
340         u16 ht_opmode;
341         u32 flags;
342         enum ieee80211_sta_rx_bandwidth new_sta_bw;
343         int ret;
344 
345         /* if HT was/is disabled, don't track any bandwidth changes */
346         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
347                 return 0;
348 
349         /* don't check VHT if we associated as non-VHT station */
350         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
351                 vht_oper = NULL;
352 
353         if (WARN_ON_ONCE(!sta))
354                 return -EINVAL;
355 
356         /*
357          * if bss configuration changed store the new one -
358          * this may be applicable even if channel is identical
359          */
360         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
361         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
362                 *changed |= BSS_CHANGED_HT;
363                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
364         }
365 
366         chan = sdata->vif.bss_conf.chandef.chan;
367         sband = local->hw.wiphy->bands[chan->band];
368 
369         /* calculate new channel (type) based on HT/VHT operation IEs */
370         flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
371                                              vht_oper, &chandef, true);
372 
373         /*
374          * Downgrade the new channel if we associated with restricted
375          * capabilities. For example, if we associated as a 20 MHz STA
376          * to a 40 MHz AP (due to regulatory, capabilities or config
377          * reasons) then switching to a 40 MHz channel now won't do us
378          * any good -- we couldn't use it with the AP.
379          */
380         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
381             chandef.width == NL80211_CHAN_WIDTH_80P80)
382                 flags |= ieee80211_chandef_downgrade(&chandef);
383         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
384             chandef.width == NL80211_CHAN_WIDTH_160)
385                 flags |= ieee80211_chandef_downgrade(&chandef);
386         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
387             chandef.width > NL80211_CHAN_WIDTH_20)
388                 flags |= ieee80211_chandef_downgrade(&chandef);
389 
390         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
391                 return 0;
392 
393         sdata_info(sdata,
394                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
395                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
396                    chandef.center_freq1, chandef.center_freq2);
397 
398         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
399                                       IEEE80211_STA_DISABLE_VHT |
400                                       IEEE80211_STA_DISABLE_40MHZ |
401                                       IEEE80211_STA_DISABLE_80P80MHZ |
402                                       IEEE80211_STA_DISABLE_160MHZ)) ||
403             !cfg80211_chandef_valid(&chandef)) {
404                 sdata_info(sdata,
405                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
406                            ifmgd->bssid);
407                 return -EINVAL;
408         }
409 
410         switch (chandef.width) {
411         case NL80211_CHAN_WIDTH_20_NOHT:
412         case NL80211_CHAN_WIDTH_20:
413                 new_sta_bw = IEEE80211_STA_RX_BW_20;
414                 break;
415         case NL80211_CHAN_WIDTH_40:
416                 new_sta_bw = IEEE80211_STA_RX_BW_40;
417                 break;
418         case NL80211_CHAN_WIDTH_80:
419                 new_sta_bw = IEEE80211_STA_RX_BW_80;
420                 break;
421         case NL80211_CHAN_WIDTH_80P80:
422         case NL80211_CHAN_WIDTH_160:
423                 new_sta_bw = IEEE80211_STA_RX_BW_160;
424                 break;
425         default:
426                 return -EINVAL;
427         }
428 
429         if (new_sta_bw > sta->cur_max_bandwidth)
430                 new_sta_bw = sta->cur_max_bandwidth;
431 
432         if (new_sta_bw < sta->sta.bandwidth) {
433                 sta->sta.bandwidth = new_sta_bw;
434                 rate_control_rate_update(local, sband, sta,
435                                          IEEE80211_RC_BW_CHANGED);
436         }
437 
438         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
439         if (ret) {
440                 sdata_info(sdata,
441                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
442                            ifmgd->bssid);
443                 return ret;
444         }
445 
446         if (new_sta_bw > sta->sta.bandwidth) {
447                 sta->sta.bandwidth = new_sta_bw;
448                 rate_control_rate_update(local, sband, sta,
449                                          IEEE80211_RC_BW_CHANGED);
450         }
451 
452         return 0;
453 }
454 
455 /* frame sending functions */
456 
457 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
458                                 struct sk_buff *skb, u8 ap_ht_param,
459                                 struct ieee80211_supported_band *sband,
460                                 struct ieee80211_channel *channel,
461                                 enum ieee80211_smps_mode smps)
462 {
463         u8 *pos;
464         u32 flags = channel->flags;
465         u16 cap;
466         struct ieee80211_sta_ht_cap ht_cap;
467 
468         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
469 
470         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
471         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
472 
473         /* determine capability flags */
474         cap = ht_cap.cap;
475 
476         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
477         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
478                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
479                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
480                         cap &= ~IEEE80211_HT_CAP_SGI_40;
481                 }
482                 break;
483         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
484                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
485                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
486                         cap &= ~IEEE80211_HT_CAP_SGI_40;
487                 }
488                 break;
489         }
490 
491         /*
492          * If 40 MHz was disabled associate as though we weren't
493          * capable of 40 MHz -- some broken APs will never fall
494          * back to trying to transmit in 20 MHz.
495          */
496         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
497                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
498                 cap &= ~IEEE80211_HT_CAP_SGI_40;
499         }
500 
501         /* set SM PS mode properly */
502         cap &= ~IEEE80211_HT_CAP_SM_PS;
503         switch (smps) {
504         case IEEE80211_SMPS_AUTOMATIC:
505         case IEEE80211_SMPS_NUM_MODES:
506                 WARN_ON(1);
507         case IEEE80211_SMPS_OFF:
508                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
509                         IEEE80211_HT_CAP_SM_PS_SHIFT;
510                 break;
511         case IEEE80211_SMPS_STATIC:
512                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
513                         IEEE80211_HT_CAP_SM_PS_SHIFT;
514                 break;
515         case IEEE80211_SMPS_DYNAMIC:
516                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
517                         IEEE80211_HT_CAP_SM_PS_SHIFT;
518                 break;
519         }
520 
521         /* reserve and fill IE */
522         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
523         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
524 }
525 
526 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
527                                  struct sk_buff *skb,
528                                  struct ieee80211_supported_band *sband,
529                                  struct ieee80211_vht_cap *ap_vht_cap)
530 {
531         u8 *pos;
532         u32 cap;
533         struct ieee80211_sta_vht_cap vht_cap;
534 
535         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
536 
537         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
538         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
539 
540         /* determine capability flags */
541         cap = vht_cap.cap;
542 
543         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
544                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
545                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
546         }
547 
548         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
549                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
550                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
551         }
552 
553         /*
554          * Some APs apparently get confused if our capabilities are better
555          * than theirs, so restrict what we advertise in the assoc request.
556          */
557         if (!(ap_vht_cap->vht_cap_info &
558                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
559                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
560 
561         /* reserve and fill IE */
562         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
563         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
564 }
565 
566 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
567 {
568         struct ieee80211_local *local = sdata->local;
569         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
570         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
571         struct sk_buff *skb;
572         struct ieee80211_mgmt *mgmt;
573         u8 *pos, qos_info;
574         size_t offset = 0, noffset;
575         int i, count, rates_len, supp_rates_len, shift;
576         u16 capab;
577         struct ieee80211_supported_band *sband;
578         struct ieee80211_chanctx_conf *chanctx_conf;
579         struct ieee80211_channel *chan;
580         u32 rate_flags, rates = 0;
581 
582         sdata_assert_lock(sdata);
583 
584         rcu_read_lock();
585         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
586         if (WARN_ON(!chanctx_conf)) {
587                 rcu_read_unlock();
588                 return;
589         }
590         chan = chanctx_conf->def.chan;
591         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
592         rcu_read_unlock();
593         sband = local->hw.wiphy->bands[chan->band];
594         shift = ieee80211_vif_get_shift(&sdata->vif);
595 
596         if (assoc_data->supp_rates_len) {
597                 /*
598                  * Get all rates supported by the device and the AP as
599                  * some APs don't like getting a superset of their rates
600                  * in the association request (e.g. D-Link DAP 1353 in
601                  * b-only mode)...
602                  */
603                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
604                                                      assoc_data->supp_rates,
605                                                      assoc_data->supp_rates_len,
606                                                      &rates);
607         } else {
608                 /*
609                  * In case AP not provide any supported rates information
610                  * before association, we send information element(s) with
611                  * all rates that we support.
612                  */
613                 rates_len = 0;
614                 for (i = 0; i < sband->n_bitrates; i++) {
615                         if ((rate_flags & sband->bitrates[i].flags)
616                             != rate_flags)
617                                 continue;
618                         rates |= BIT(i);
619                         rates_len++;
620                 }
621         }
622 
623         skb = alloc_skb(local->hw.extra_tx_headroom +
624                         sizeof(*mgmt) + /* bit too much but doesn't matter */
625                         2 + assoc_data->ssid_len + /* SSID */
626                         4 + rates_len + /* (extended) rates */
627                         4 + /* power capability */
628                         2 + 2 * sband->n_channels + /* supported channels */
629                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
630                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
631                         assoc_data->ie_len + /* extra IEs */
632                         9, /* WMM */
633                         GFP_KERNEL);
634         if (!skb)
635                 return;
636 
637         skb_reserve(skb, local->hw.extra_tx_headroom);
638 
639         capab = WLAN_CAPABILITY_ESS;
640 
641         if (sband->band == IEEE80211_BAND_2GHZ) {
642                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
643                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
644                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
645                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
646         }
647 
648         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
649                 capab |= WLAN_CAPABILITY_PRIVACY;
650 
651         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
652             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
653                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
654 
655         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
656         memset(mgmt, 0, 24);
657         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
658         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
659         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
660 
661         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
662                 skb_put(skb, 10);
663                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
664                                                   IEEE80211_STYPE_REASSOC_REQ);
665                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
666                 mgmt->u.reassoc_req.listen_interval =
667                                 cpu_to_le16(local->hw.conf.listen_interval);
668                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
669                        ETH_ALEN);
670         } else {
671                 skb_put(skb, 4);
672                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
673                                                   IEEE80211_STYPE_ASSOC_REQ);
674                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
675                 mgmt->u.assoc_req.listen_interval =
676                                 cpu_to_le16(local->hw.conf.listen_interval);
677         }
678 
679         /* SSID */
680         pos = skb_put(skb, 2 + assoc_data->ssid_len);
681         *pos++ = WLAN_EID_SSID;
682         *pos++ = assoc_data->ssid_len;
683         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
684 
685         /* add all rates which were marked to be used above */
686         supp_rates_len = rates_len;
687         if (supp_rates_len > 8)
688                 supp_rates_len = 8;
689 
690         pos = skb_put(skb, supp_rates_len + 2);
691         *pos++ = WLAN_EID_SUPP_RATES;
692         *pos++ = supp_rates_len;
693 
694         count = 0;
695         for (i = 0; i < sband->n_bitrates; i++) {
696                 if (BIT(i) & rates) {
697                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
698                                                 5 * (1 << shift));
699                         *pos++ = (u8) rate;
700                         if (++count == 8)
701                                 break;
702                 }
703         }
704 
705         if (rates_len > count) {
706                 pos = skb_put(skb, rates_len - count + 2);
707                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
708                 *pos++ = rates_len - count;
709 
710                 for (i++; i < sband->n_bitrates; i++) {
711                         if (BIT(i) & rates) {
712                                 int rate;
713                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
714                                                     5 * (1 << shift));
715                                 *pos++ = (u8) rate;
716                         }
717                 }
718         }
719 
720         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
721                 /* 1. power capabilities */
722                 pos = skb_put(skb, 4);
723                 *pos++ = WLAN_EID_PWR_CAPABILITY;
724                 *pos++ = 2;
725                 *pos++ = 0; /* min tx power */
726                  /* max tx power */
727                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
728 
729                 /* 2. supported channels */
730                 /* TODO: get this in reg domain format */
731                 pos = skb_put(skb, 2 * sband->n_channels + 2);
732                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
733                 *pos++ = 2 * sband->n_channels;
734                 for (i = 0; i < sband->n_channels; i++) {
735                         *pos++ = ieee80211_frequency_to_channel(
736                                         sband->channels[i].center_freq);
737                         *pos++ = 1; /* one channel in the subband*/
738                 }
739         }
740 
741         /* if present, add any custom IEs that go before HT */
742         if (assoc_data->ie_len) {
743                 static const u8 before_ht[] = {
744                         WLAN_EID_SSID,
745                         WLAN_EID_SUPP_RATES,
746                         WLAN_EID_EXT_SUPP_RATES,
747                         WLAN_EID_PWR_CAPABILITY,
748                         WLAN_EID_SUPPORTED_CHANNELS,
749                         WLAN_EID_RSN,
750                         WLAN_EID_QOS_CAPA,
751                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
752                         WLAN_EID_MOBILITY_DOMAIN,
753                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
754                 };
755                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
756                                              before_ht, ARRAY_SIZE(before_ht),
757                                              offset);
758                 pos = skb_put(skb, noffset - offset);
759                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
760                 offset = noffset;
761         }
762 
763         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
764                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
765                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
766 
767         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
768                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
769                                     sband, chan, sdata->smps_mode);
770 
771         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
772                 ieee80211_add_vht_ie(sdata, skb, sband,
773                                      &assoc_data->ap_vht_cap);
774 
775         /* if present, add any custom non-vendor IEs that go after HT */
776         if (assoc_data->ie_len) {
777                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
778                                                     assoc_data->ie_len,
779                                                     offset);
780                 pos = skb_put(skb, noffset - offset);
781                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
782                 offset = noffset;
783         }
784 
785         if (assoc_data->wmm) {
786                 if (assoc_data->uapsd) {
787                         qos_info = ifmgd->uapsd_queues;
788                         qos_info |= (ifmgd->uapsd_max_sp_len <<
789                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
790                 } else {
791                         qos_info = 0;
792                 }
793 
794                 pos = skb_put(skb, 9);
795                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
796                 *pos++ = 7; /* len */
797                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
798                 *pos++ = 0x50;
799                 *pos++ = 0xf2;
800                 *pos++ = 2; /* WME */
801                 *pos++ = 0; /* WME info */
802                 *pos++ = 1; /* WME ver */
803                 *pos++ = qos_info;
804         }
805 
806         /* add any remaining custom (i.e. vendor specific here) IEs */
807         if (assoc_data->ie_len) {
808                 noffset = assoc_data->ie_len;
809                 pos = skb_put(skb, noffset - offset);
810                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
811         }
812 
813         drv_mgd_prepare_tx(local, sdata);
814 
815         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
816         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
817                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
818                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
819         ieee80211_tx_skb(sdata, skb);
820 }
821 
822 void ieee80211_send_pspoll(struct ieee80211_local *local,
823                            struct ieee80211_sub_if_data *sdata)
824 {
825         struct ieee80211_pspoll *pspoll;
826         struct sk_buff *skb;
827 
828         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
829         if (!skb)
830                 return;
831 
832         pspoll = (struct ieee80211_pspoll *) skb->data;
833         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
834 
835         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
836         ieee80211_tx_skb(sdata, skb);
837 }
838 
839 void ieee80211_send_nullfunc(struct ieee80211_local *local,
840                              struct ieee80211_sub_if_data *sdata,
841                              int powersave)
842 {
843         struct sk_buff *skb;
844         struct ieee80211_hdr_3addr *nullfunc;
845         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
846 
847         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
848         if (!skb)
849                 return;
850 
851         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
852         if (powersave)
853                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
854 
855         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
856                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
857 
858         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
859                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
860 
861         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
862                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
863 
864         ieee80211_tx_skb(sdata, skb);
865 }
866 
867 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
868                                           struct ieee80211_sub_if_data *sdata)
869 {
870         struct sk_buff *skb;
871         struct ieee80211_hdr *nullfunc;
872         __le16 fc;
873 
874         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
875                 return;
876 
877         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
878         if (!skb)
879                 return;
880 
881         skb_reserve(skb, local->hw.extra_tx_headroom);
882 
883         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
884         memset(nullfunc, 0, 30);
885         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
886                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
887         nullfunc->frame_control = fc;
888         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
889         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
890         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
891         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
892 
893         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
894         ieee80211_tx_skb(sdata, skb);
895 }
896 
897 /* spectrum management related things */
898 static void ieee80211_chswitch_work(struct work_struct *work)
899 {
900         struct ieee80211_sub_if_data *sdata =
901                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
902         struct ieee80211_local *local = sdata->local;
903         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
904         u32 changed = 0;
905         int ret;
906 
907         if (!ieee80211_sdata_running(sdata))
908                 return;
909 
910         sdata_lock(sdata);
911         if (!ifmgd->associated)
912                 goto out;
913 
914         mutex_lock(&local->mtx);
915         ret = ieee80211_vif_change_channel(sdata, &changed);
916         mutex_unlock(&local->mtx);
917         if (ret) {
918                 sdata_info(sdata,
919                            "vif channel switch failed, disconnecting\n");
920                 ieee80211_queue_work(&sdata->local->hw,
921                                      &ifmgd->csa_connection_drop_work);
922                 goto out;
923         }
924 
925         if (!local->use_chanctx) {
926                 local->_oper_chandef = sdata->csa_chandef;
927                 /* Call "hw_config" only if doing sw channel switch.
928                  * Otherwise update the channel directly
929                  */
930                 if (!local->ops->channel_switch)
931                         ieee80211_hw_config(local, 0);
932                 else
933                         local->hw.conf.chandef = local->_oper_chandef;
934         }
935 
936         /* XXX: shouldn't really modify cfg80211-owned data! */
937         ifmgd->associated->channel = sdata->csa_chandef.chan;
938 
939         /* XXX: wait for a beacon first? */
940         ieee80211_wake_queues_by_reason(&local->hw,
941                                         IEEE80211_MAX_QUEUE_MAP,
942                                         IEEE80211_QUEUE_STOP_REASON_CSA);
943 
944         ieee80211_bss_info_change_notify(sdata, changed);
945 
946  out:
947         sdata->vif.csa_active = false;
948         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
949         sdata_unlock(sdata);
950 }
951 
952 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
953 {
954         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
955         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
956 
957         trace_api_chswitch_done(sdata, success);
958         if (!success) {
959                 sdata_info(sdata,
960                            "driver channel switch failed, disconnecting\n");
961                 ieee80211_queue_work(&sdata->local->hw,
962                                      &ifmgd->csa_connection_drop_work);
963         } else {
964                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
965         }
966 }
967 EXPORT_SYMBOL(ieee80211_chswitch_done);
968 
969 static void ieee80211_chswitch_timer(unsigned long data)
970 {
971         struct ieee80211_sub_if_data *sdata =
972                 (struct ieee80211_sub_if_data *) data;
973 
974         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
975 }
976 
977 static void
978 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
979                                  u64 timestamp, struct ieee802_11_elems *elems,
980                                  bool beacon)
981 {
982         struct ieee80211_local *local = sdata->local;
983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
984         struct cfg80211_bss *cbss = ifmgd->associated;
985         struct ieee80211_chanctx *chanctx;
986         enum ieee80211_band current_band;
987         struct ieee80211_csa_ie csa_ie;
988         int res;
989 
990         sdata_assert_lock(sdata);
991 
992         if (!cbss)
993                 return;
994 
995         if (local->scanning)
996                 return;
997 
998         /* disregard subsequent announcements if we are already processing */
999         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1000                 return;
1001 
1002         current_band = cbss->channel->band;
1003         memset(&csa_ie, 0, sizeof(csa_ie));
1004         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1005                                            ifmgd->flags,
1006                                            ifmgd->associated->bssid, &csa_ie);
1007         if (res < 0)
1008                 ieee80211_queue_work(&local->hw,
1009                                      &ifmgd->csa_connection_drop_work);
1010         if (res)
1011                 return;
1012 
1013         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1014                                      IEEE80211_CHAN_DISABLED)) {
1015                 sdata_info(sdata,
1016                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1017                            ifmgd->associated->bssid,
1018                            csa_ie.chandef.chan->center_freq,
1019                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1020                            csa_ie.chandef.center_freq2);
1021                 ieee80211_queue_work(&local->hw,
1022                                      &ifmgd->csa_connection_drop_work);
1023                 return;
1024         }
1025 
1026         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1027         sdata->vif.csa_active = true;
1028 
1029         mutex_lock(&local->chanctx_mtx);
1030         if (local->use_chanctx) {
1031                 u32 num_chanctx = 0;
1032                 list_for_each_entry(chanctx, &local->chanctx_list, list)
1033                        num_chanctx++;
1034 
1035                 if (num_chanctx > 1 ||
1036                     !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1037                         sdata_info(sdata,
1038                                    "not handling chan-switch with channel contexts\n");
1039                         ieee80211_queue_work(&local->hw,
1040                                              &ifmgd->csa_connection_drop_work);
1041                         mutex_unlock(&local->chanctx_mtx);
1042                         return;
1043                 }
1044         }
1045 
1046         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1047                 ieee80211_queue_work(&local->hw,
1048                                      &ifmgd->csa_connection_drop_work);
1049                 mutex_unlock(&local->chanctx_mtx);
1050                 return;
1051         }
1052         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1053                                struct ieee80211_chanctx, conf);
1054         if (chanctx->refcount > 1) {
1055                 sdata_info(sdata,
1056                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
1057                 ieee80211_queue_work(&local->hw,
1058                                      &ifmgd->csa_connection_drop_work);
1059                 mutex_unlock(&local->chanctx_mtx);
1060                 return;
1061         }
1062         mutex_unlock(&local->chanctx_mtx);
1063 
1064         sdata->csa_chandef = csa_ie.chandef;
1065 
1066         if (csa_ie.mode)
1067                 ieee80211_stop_queues_by_reason(&local->hw,
1068                                 IEEE80211_MAX_QUEUE_MAP,
1069                                 IEEE80211_QUEUE_STOP_REASON_CSA);
1070 
1071         if (local->ops->channel_switch) {
1072                 /* use driver's channel switch callback */
1073                 struct ieee80211_channel_switch ch_switch = {
1074                         .timestamp = timestamp,
1075                         .block_tx = csa_ie.mode,
1076                         .chandef = csa_ie.chandef,
1077                         .count = csa_ie.count,
1078                 };
1079 
1080                 drv_channel_switch(local, &ch_switch);
1081                 return;
1082         }
1083 
1084         /* channel switch handled in software */
1085         if (csa_ie.count <= 1)
1086                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1087         else
1088                 mod_timer(&ifmgd->chswitch_timer,
1089                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1090                                          cbss->beacon_interval));
1091 }
1092 
1093 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1094                                        struct ieee80211_channel *channel,
1095                                        const u8 *country_ie, u8 country_ie_len,
1096                                        const u8 *pwr_constr_elem)
1097 {
1098         struct ieee80211_country_ie_triplet *triplet;
1099         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1100         int i, chan_pwr, chan_increment, new_ap_level;
1101         bool have_chan_pwr = false;
1102 
1103         /* Invalid IE */
1104         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1105                 return 0;
1106 
1107         triplet = (void *)(country_ie + 3);
1108         country_ie_len -= 3;
1109 
1110         switch (channel->band) {
1111         default:
1112                 WARN_ON_ONCE(1);
1113                 /* fall through */
1114         case IEEE80211_BAND_2GHZ:
1115         case IEEE80211_BAND_60GHZ:
1116                 chan_increment = 1;
1117                 break;
1118         case IEEE80211_BAND_5GHZ:
1119                 chan_increment = 4;
1120                 break;
1121         }
1122 
1123         /* find channel */
1124         while (country_ie_len >= 3) {
1125                 u8 first_channel = triplet->chans.first_channel;
1126 
1127                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1128                         goto next;
1129 
1130                 for (i = 0; i < triplet->chans.num_channels; i++) {
1131                         if (first_channel + i * chan_increment == chan) {
1132                                 have_chan_pwr = true;
1133                                 chan_pwr = triplet->chans.max_power;
1134                                 break;
1135                         }
1136                 }
1137                 if (have_chan_pwr)
1138                         break;
1139 
1140  next:
1141                 triplet++;
1142                 country_ie_len -= 3;
1143         }
1144 
1145         if (!have_chan_pwr)
1146                 return 0;
1147 
1148         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1149 
1150         if (sdata->ap_power_level == new_ap_level)
1151                 return 0;
1152 
1153         sdata_info(sdata,
1154                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1155                    new_ap_level, chan_pwr, *pwr_constr_elem,
1156                    sdata->u.mgd.bssid);
1157         sdata->ap_power_level = new_ap_level;
1158         if (__ieee80211_recalc_txpower(sdata))
1159                 return BSS_CHANGED_TXPOWER;
1160         return 0;
1161 }
1162 
1163 /* powersave */
1164 static void ieee80211_enable_ps(struct ieee80211_local *local,
1165                                 struct ieee80211_sub_if_data *sdata)
1166 {
1167         struct ieee80211_conf *conf = &local->hw.conf;
1168 
1169         /*
1170          * If we are scanning right now then the parameters will
1171          * take effect when scan finishes.
1172          */
1173         if (local->scanning)
1174                 return;
1175 
1176         if (conf->dynamic_ps_timeout > 0 &&
1177             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1178                 mod_timer(&local->dynamic_ps_timer, jiffies +
1179                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1180         } else {
1181                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1182                         ieee80211_send_nullfunc(local, sdata, 1);
1183 
1184                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1185                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1186                         return;
1187 
1188                 conf->flags |= IEEE80211_CONF_PS;
1189                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1190         }
1191 }
1192 
1193 static void ieee80211_change_ps(struct ieee80211_local *local)
1194 {
1195         struct ieee80211_conf *conf = &local->hw.conf;
1196 
1197         if (local->ps_sdata) {
1198                 ieee80211_enable_ps(local, local->ps_sdata);
1199         } else if (conf->flags & IEEE80211_CONF_PS) {
1200                 conf->flags &= ~IEEE80211_CONF_PS;
1201                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1202                 del_timer_sync(&local->dynamic_ps_timer);
1203                 cancel_work_sync(&local->dynamic_ps_enable_work);
1204         }
1205 }
1206 
1207 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1208 {
1209         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1210         struct sta_info *sta = NULL;
1211         bool authorized = false;
1212 
1213         if (!mgd->powersave)
1214                 return false;
1215 
1216         if (mgd->broken_ap)
1217                 return false;
1218 
1219         if (!mgd->associated)
1220                 return false;
1221 
1222         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1223                 return false;
1224 
1225         if (!mgd->have_beacon)
1226                 return false;
1227 
1228         rcu_read_lock();
1229         sta = sta_info_get(sdata, mgd->bssid);
1230         if (sta)
1231                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1232         rcu_read_unlock();
1233 
1234         return authorized;
1235 }
1236 
1237 /* need to hold RTNL or interface lock */
1238 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1239 {
1240         struct ieee80211_sub_if_data *sdata, *found = NULL;
1241         int count = 0;
1242         int timeout;
1243 
1244         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1245                 local->ps_sdata = NULL;
1246                 return;
1247         }
1248 
1249         list_for_each_entry(sdata, &local->interfaces, list) {
1250                 if (!ieee80211_sdata_running(sdata))
1251                         continue;
1252                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1253                         /* If an AP vif is found, then disable PS
1254                          * by setting the count to zero thereby setting
1255                          * ps_sdata to NULL.
1256                          */
1257                         count = 0;
1258                         break;
1259                 }
1260                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1261                         continue;
1262                 found = sdata;
1263                 count++;
1264         }
1265 
1266         if (count == 1 && ieee80211_powersave_allowed(found)) {
1267                 s32 beaconint_us;
1268 
1269                 if (latency < 0)
1270                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1271 
1272                 beaconint_us = ieee80211_tu_to_usec(
1273                                         found->vif.bss_conf.beacon_int);
1274 
1275                 timeout = local->dynamic_ps_forced_timeout;
1276                 if (timeout < 0) {
1277                         /*
1278                          * Go to full PSM if the user configures a very low
1279                          * latency requirement.
1280                          * The 2000 second value is there for compatibility
1281                          * until the PM_QOS_NETWORK_LATENCY is configured
1282                          * with real values.
1283                          */
1284                         if (latency > (1900 * USEC_PER_MSEC) &&
1285                             latency != (2000 * USEC_PER_SEC))
1286                                 timeout = 0;
1287                         else
1288                                 timeout = 100;
1289                 }
1290                 local->hw.conf.dynamic_ps_timeout = timeout;
1291 
1292                 if (beaconint_us > latency) {
1293                         local->ps_sdata = NULL;
1294                 } else {
1295                         int maxslp = 1;
1296                         u8 dtimper = found->u.mgd.dtim_period;
1297 
1298                         /* If the TIM IE is invalid, pretend the value is 1 */
1299                         if (!dtimper)
1300                                 dtimper = 1;
1301                         else if (dtimper > 1)
1302                                 maxslp = min_t(int, dtimper,
1303                                                     latency / beaconint_us);
1304 
1305                         local->hw.conf.max_sleep_period = maxslp;
1306                         local->hw.conf.ps_dtim_period = dtimper;
1307                         local->ps_sdata = found;
1308                 }
1309         } else {
1310                 local->ps_sdata = NULL;
1311         }
1312 
1313         ieee80211_change_ps(local);
1314 }
1315 
1316 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1317 {
1318         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1319 
1320         if (sdata->vif.bss_conf.ps != ps_allowed) {
1321                 sdata->vif.bss_conf.ps = ps_allowed;
1322                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1323         }
1324 }
1325 
1326 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1327 {
1328         struct ieee80211_local *local =
1329                 container_of(work, struct ieee80211_local,
1330                              dynamic_ps_disable_work);
1331 
1332         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1333                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1334                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1335         }
1336 
1337         ieee80211_wake_queues_by_reason(&local->hw,
1338                                         IEEE80211_MAX_QUEUE_MAP,
1339                                         IEEE80211_QUEUE_STOP_REASON_PS);
1340 }
1341 
1342 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1343 {
1344         struct ieee80211_local *local =
1345                 container_of(work, struct ieee80211_local,
1346                              dynamic_ps_enable_work);
1347         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1348         struct ieee80211_if_managed *ifmgd;
1349         unsigned long flags;
1350         int q;
1351 
1352         /* can only happen when PS was just disabled anyway */
1353         if (!sdata)
1354                 return;
1355 
1356         ifmgd = &sdata->u.mgd;
1357 
1358         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1359                 return;
1360 
1361         if (local->hw.conf.dynamic_ps_timeout > 0) {
1362                 /* don't enter PS if TX frames are pending */
1363                 if (drv_tx_frames_pending(local)) {
1364                         mod_timer(&local->dynamic_ps_timer, jiffies +
1365                                   msecs_to_jiffies(
1366                                   local->hw.conf.dynamic_ps_timeout));
1367                         return;
1368                 }
1369 
1370                 /*
1371                  * transmission can be stopped by others which leads to
1372                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1373                  * is not the actual idle state.
1374                  */
1375                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1376                 for (q = 0; q < local->hw.queues; q++) {
1377                         if (local->queue_stop_reasons[q]) {
1378                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1379                                                        flags);
1380                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1381                                           msecs_to_jiffies(
1382                                           local->hw.conf.dynamic_ps_timeout));
1383                                 return;
1384                         }
1385                 }
1386                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1387         }
1388 
1389         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1390             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1391                 if (drv_tx_frames_pending(local)) {
1392                         mod_timer(&local->dynamic_ps_timer, jiffies +
1393                                   msecs_to_jiffies(
1394                                   local->hw.conf.dynamic_ps_timeout));
1395                 } else {
1396                         ieee80211_send_nullfunc(local, sdata, 1);
1397                         /* Flush to get the tx status of nullfunc frame */
1398                         ieee80211_flush_queues(local, sdata);
1399                 }
1400         }
1401 
1402         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1403               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1404             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1405                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1406                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1407                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1408         }
1409 }
1410 
1411 void ieee80211_dynamic_ps_timer(unsigned long data)
1412 {
1413         struct ieee80211_local *local = (void *) data;
1414 
1415         if (local->quiescing || local->suspended)
1416                 return;
1417 
1418         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1419 }
1420 
1421 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1422 {
1423         struct delayed_work *delayed_work =
1424                 container_of(work, struct delayed_work, work);
1425         struct ieee80211_sub_if_data *sdata =
1426                 container_of(delayed_work, struct ieee80211_sub_if_data,
1427                              dfs_cac_timer_work);
1428         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1429 
1430         mutex_lock(&sdata->local->mtx);
1431         if (sdata->wdev.cac_started) {
1432                 ieee80211_vif_release_channel(sdata);
1433                 cfg80211_cac_event(sdata->dev, &chandef,
1434                                    NL80211_RADAR_CAC_FINISHED,
1435                                    GFP_KERNEL);
1436         }
1437         mutex_unlock(&sdata->local->mtx);
1438 }
1439 
1440 /* MLME */
1441 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1442                                      struct ieee80211_sub_if_data *sdata,
1443                                      const u8 *wmm_param, size_t wmm_param_len)
1444 {
1445         struct ieee80211_tx_queue_params params;
1446         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1447         size_t left;
1448         int count;
1449         const u8 *pos;
1450         u8 uapsd_queues = 0;
1451 
1452         if (!local->ops->conf_tx)
1453                 return false;
1454 
1455         if (local->hw.queues < IEEE80211_NUM_ACS)
1456                 return false;
1457 
1458         if (!wmm_param)
1459                 return false;
1460 
1461         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1462                 return false;
1463 
1464         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1465                 uapsd_queues = ifmgd->uapsd_queues;
1466 
1467         count = wmm_param[6] & 0x0f;
1468         if (count == ifmgd->wmm_last_param_set)
1469                 return false;
1470         ifmgd->wmm_last_param_set = count;
1471 
1472         pos = wmm_param + 8;
1473         left = wmm_param_len - 8;
1474 
1475         memset(&params, 0, sizeof(params));
1476 
1477         sdata->wmm_acm = 0;
1478         for (; left >= 4; left -= 4, pos += 4) {
1479                 int aci = (pos[0] >> 5) & 0x03;
1480                 int acm = (pos[0] >> 4) & 0x01;
1481                 bool uapsd = false;
1482                 int queue;
1483 
1484                 switch (aci) {
1485                 case 1: /* AC_BK */
1486                         queue = 3;
1487                         if (acm)
1488                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1489                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1490                                 uapsd = true;
1491                         break;
1492                 case 2: /* AC_VI */
1493                         queue = 1;
1494                         if (acm)
1495                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1496                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1497                                 uapsd = true;
1498                         break;
1499                 case 3: /* AC_VO */
1500                         queue = 0;
1501                         if (acm)
1502                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1503                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1504                                 uapsd = true;
1505                         break;
1506                 case 0: /* AC_BE */
1507                 default:
1508                         queue = 2;
1509                         if (acm)
1510                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1511                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1512                                 uapsd = true;
1513                         break;
1514                 }
1515 
1516                 params.aifs = pos[0] & 0x0f;
1517                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1518                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1519                 params.txop = get_unaligned_le16(pos + 2);
1520                 params.acm = acm;
1521                 params.uapsd = uapsd;
1522 
1523                 mlme_dbg(sdata,
1524                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1525                          queue, aci, acm,
1526                          params.aifs, params.cw_min, params.cw_max,
1527                          params.txop, params.uapsd);
1528                 sdata->tx_conf[queue] = params;
1529                 if (drv_conf_tx(local, sdata, queue, &params))
1530                         sdata_err(sdata,
1531                                   "failed to set TX queue parameters for queue %d\n",
1532                                   queue);
1533         }
1534 
1535         /* enable WMM or activate new settings */
1536         sdata->vif.bss_conf.qos = true;
1537         return true;
1538 }
1539 
1540 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1541 {
1542         lockdep_assert_held(&sdata->local->mtx);
1543 
1544         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1545         ieee80211_run_deferred_scan(sdata->local);
1546 }
1547 
1548 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1549 {
1550         mutex_lock(&sdata->local->mtx);
1551         __ieee80211_stop_poll(sdata);
1552         mutex_unlock(&sdata->local->mtx);
1553 }
1554 
1555 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1556                                            u16 capab, bool erp_valid, u8 erp)
1557 {
1558         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1559         u32 changed = 0;
1560         bool use_protection;
1561         bool use_short_preamble;
1562         bool use_short_slot;
1563 
1564         if (erp_valid) {
1565                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1566                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1567         } else {
1568                 use_protection = false;
1569                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1570         }
1571 
1572         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1573         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1574                 use_short_slot = true;
1575 
1576         if (use_protection != bss_conf->use_cts_prot) {
1577                 bss_conf->use_cts_prot = use_protection;
1578                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1579         }
1580 
1581         if (use_short_preamble != bss_conf->use_short_preamble) {
1582                 bss_conf->use_short_preamble = use_short_preamble;
1583                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1584         }
1585 
1586         if (use_short_slot != bss_conf->use_short_slot) {
1587                 bss_conf->use_short_slot = use_short_slot;
1588                 changed |= BSS_CHANGED_ERP_SLOT;
1589         }
1590 
1591         return changed;
1592 }
1593 
1594 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1595                                      struct cfg80211_bss *cbss,
1596                                      u32 bss_info_changed)
1597 {
1598         struct ieee80211_bss *bss = (void *)cbss->priv;
1599         struct ieee80211_local *local = sdata->local;
1600         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1601 
1602         bss_info_changed |= BSS_CHANGED_ASSOC;
1603         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1604                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1605 
1606         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1607                 beacon_loss_count * bss_conf->beacon_int));
1608 
1609         sdata->u.mgd.associated = cbss;
1610         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1611 
1612         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1613 
1614         if (sdata->vif.p2p) {
1615                 const struct cfg80211_bss_ies *ies;
1616 
1617                 rcu_read_lock();
1618                 ies = rcu_dereference(cbss->ies);
1619                 if (ies) {
1620                         int ret;
1621 
1622                         ret = cfg80211_get_p2p_attr(
1623                                         ies->data, ies->len,
1624                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1625                                         (u8 *) &bss_conf->p2p_noa_attr,
1626                                         sizeof(bss_conf->p2p_noa_attr));
1627                         if (ret >= 2) {
1628                                 sdata->u.mgd.p2p_noa_index =
1629                                         bss_conf->p2p_noa_attr.index;
1630                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1631                         }
1632                 }
1633                 rcu_read_unlock();
1634         }
1635 
1636         /* just to be sure */
1637         ieee80211_stop_poll(sdata);
1638 
1639         ieee80211_led_assoc(local, 1);
1640 
1641         if (sdata->u.mgd.have_beacon) {
1642                 /*
1643                  * If the AP is buggy we may get here with no DTIM period
1644                  * known, so assume it's 1 which is the only safe assumption
1645                  * in that case, although if the TIM IE is broken powersave
1646                  * probably just won't work at all.
1647                  */
1648                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1649                 bss_conf->beacon_rate = bss->beacon_rate;
1650                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1651         } else {
1652                 bss_conf->beacon_rate = NULL;
1653                 bss_conf->dtim_period = 0;
1654         }
1655 
1656         bss_conf->assoc = 1;
1657 
1658         /* Tell the driver to monitor connection quality (if supported) */
1659         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1660             bss_conf->cqm_rssi_thold)
1661                 bss_info_changed |= BSS_CHANGED_CQM;
1662 
1663         /* Enable ARP filtering */
1664         if (bss_conf->arp_addr_cnt)
1665                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1666 
1667         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1668 
1669         mutex_lock(&local->iflist_mtx);
1670         ieee80211_recalc_ps(local, -1);
1671         mutex_unlock(&local->iflist_mtx);
1672 
1673         ieee80211_recalc_smps(sdata);
1674         ieee80211_recalc_ps_vif(sdata);
1675 
1676         netif_carrier_on(sdata->dev);
1677 }
1678 
1679 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1680                                    u16 stype, u16 reason, bool tx,
1681                                    u8 *frame_buf)
1682 {
1683         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1684         struct ieee80211_local *local = sdata->local;
1685         u32 changed = 0;
1686 
1687         sdata_assert_lock(sdata);
1688 
1689         if (WARN_ON_ONCE(tx && !frame_buf))
1690                 return;
1691 
1692         if (WARN_ON(!ifmgd->associated))
1693                 return;
1694 
1695         ieee80211_stop_poll(sdata);
1696 
1697         ifmgd->associated = NULL;
1698         netif_carrier_off(sdata->dev);
1699 
1700         /*
1701          * if we want to get out of ps before disassoc (why?) we have
1702          * to do it before sending disassoc, as otherwise the null-packet
1703          * won't be valid.
1704          */
1705         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1706                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1707                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1708         }
1709         local->ps_sdata = NULL;
1710 
1711         /* disable per-vif ps */
1712         ieee80211_recalc_ps_vif(sdata);
1713 
1714         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1715         if (tx)
1716                 ieee80211_flush_queues(local, sdata);
1717 
1718         /* deauthenticate/disassociate now */
1719         if (tx || frame_buf)
1720                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1721                                                reason, tx, frame_buf);
1722 
1723         /* flush out frame */
1724         if (tx)
1725                 ieee80211_flush_queues(local, sdata);
1726 
1727         /* clear bssid only after building the needed mgmt frames */
1728         memset(ifmgd->bssid, 0, ETH_ALEN);
1729 
1730         /* remove AP and TDLS peers */
1731         sta_info_flush(sdata);
1732 
1733         /* finally reset all BSS / config parameters */
1734         changed |= ieee80211_reset_erp_info(sdata);
1735 
1736         ieee80211_led_assoc(local, 0);
1737         changed |= BSS_CHANGED_ASSOC;
1738         sdata->vif.bss_conf.assoc = false;
1739 
1740         ifmgd->p2p_noa_index = -1;
1741         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1742                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1743 
1744         /* on the next assoc, re-program HT/VHT parameters */
1745         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1746         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1747         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1748         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1749 
1750         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1751 
1752         del_timer_sync(&local->dynamic_ps_timer);
1753         cancel_work_sync(&local->dynamic_ps_enable_work);
1754 
1755         /* Disable ARP filtering */
1756         if (sdata->vif.bss_conf.arp_addr_cnt)
1757                 changed |= BSS_CHANGED_ARP_FILTER;
1758 
1759         sdata->vif.bss_conf.qos = false;
1760         changed |= BSS_CHANGED_QOS;
1761 
1762         /* The BSSID (not really interesting) and HT changed */
1763         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1764         ieee80211_bss_info_change_notify(sdata, changed);
1765 
1766         /* disassociated - set to defaults now */
1767         ieee80211_set_wmm_default(sdata, false);
1768 
1769         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1770         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1771         del_timer_sync(&sdata->u.mgd.timer);
1772         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1773 
1774         sdata->vif.bss_conf.dtim_period = 0;
1775         sdata->vif.bss_conf.beacon_rate = NULL;
1776 
1777         ifmgd->have_beacon = false;
1778 
1779         ifmgd->flags = 0;
1780         mutex_lock(&local->mtx);
1781         ieee80211_vif_release_channel(sdata);
1782         mutex_unlock(&local->mtx);
1783 
1784         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1785 }
1786 
1787 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1788                              struct ieee80211_hdr *hdr)
1789 {
1790         /*
1791          * We can postpone the mgd.timer whenever receiving unicast frames
1792          * from AP because we know that the connection is working both ways
1793          * at that time. But multicast frames (and hence also beacons) must
1794          * be ignored here, because we need to trigger the timer during
1795          * data idle periods for sending the periodic probe request to the
1796          * AP we're connected to.
1797          */
1798         if (is_multicast_ether_addr(hdr->addr1))
1799                 return;
1800 
1801         ieee80211_sta_reset_conn_monitor(sdata);
1802 }
1803 
1804 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1805 {
1806         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1807         struct ieee80211_local *local = sdata->local;
1808 
1809         mutex_lock(&local->mtx);
1810         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1811                 goto out;
1812 
1813         __ieee80211_stop_poll(sdata);
1814 
1815         mutex_lock(&local->iflist_mtx);
1816         ieee80211_recalc_ps(local, -1);
1817         mutex_unlock(&local->iflist_mtx);
1818 
1819         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1820                 goto out;
1821 
1822         /*
1823          * We've received a probe response, but are not sure whether
1824          * we have or will be receiving any beacons or data, so let's
1825          * schedule the timers again, just in case.
1826          */
1827         ieee80211_sta_reset_beacon_monitor(sdata);
1828 
1829         mod_timer(&ifmgd->conn_mon_timer,
1830                   round_jiffies_up(jiffies +
1831                                    IEEE80211_CONNECTION_IDLE_TIME));
1832 out:
1833         mutex_unlock(&local->mtx);
1834 }
1835 
1836 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1837                              struct ieee80211_hdr *hdr, bool ack)
1838 {
1839         if (!ieee80211_is_data(hdr->frame_control))
1840             return;
1841 
1842         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1843             sdata->u.mgd.probe_send_count > 0) {
1844                 if (ack)
1845                         ieee80211_sta_reset_conn_monitor(sdata);
1846                 else
1847                         sdata->u.mgd.nullfunc_failed = true;
1848                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1849                 return;
1850         }
1851 
1852         if (ack)
1853                 ieee80211_sta_reset_conn_monitor(sdata);
1854 }
1855 
1856 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1857 {
1858         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1859         const u8 *ssid;
1860         u8 *dst = ifmgd->associated->bssid;
1861         u8 unicast_limit = max(1, max_probe_tries - 3);
1862 
1863         /*
1864          * Try sending broadcast probe requests for the last three
1865          * probe requests after the first ones failed since some
1866          * buggy APs only support broadcast probe requests.
1867          */
1868         if (ifmgd->probe_send_count >= unicast_limit)
1869                 dst = NULL;
1870 
1871         /*
1872          * When the hardware reports an accurate Tx ACK status, it's
1873          * better to send a nullfunc frame instead of a probe request,
1874          * as it will kick us off the AP quickly if we aren't associated
1875          * anymore. The timeout will be reset if the frame is ACKed by
1876          * the AP.
1877          */
1878         ifmgd->probe_send_count++;
1879 
1880         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1881                 ifmgd->nullfunc_failed = false;
1882                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1883         } else {
1884                 int ssid_len;
1885 
1886                 rcu_read_lock();
1887                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1888                 if (WARN_ON_ONCE(ssid == NULL))
1889                         ssid_len = 0;
1890                 else
1891                         ssid_len = ssid[1];
1892 
1893                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1894                                          0, (u32) -1, true, 0,
1895                                          ifmgd->associated->channel, false);
1896                 rcu_read_unlock();
1897         }
1898 
1899         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1900         run_again(sdata, ifmgd->probe_timeout);
1901         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1902                 ieee80211_flush_queues(sdata->local, sdata);
1903 }
1904 
1905 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1906                                    bool beacon)
1907 {
1908         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1909         bool already = false;
1910 
1911         if (!ieee80211_sdata_running(sdata))
1912                 return;
1913 
1914         sdata_lock(sdata);
1915 
1916         if (!ifmgd->associated)
1917                 goto out;
1918 
1919         mutex_lock(&sdata->local->mtx);
1920 
1921         if (sdata->local->tmp_channel || sdata->local->scanning) {
1922                 mutex_unlock(&sdata->local->mtx);
1923                 goto out;
1924         }
1925 
1926         if (beacon) {
1927                 mlme_dbg_ratelimited(sdata,
1928                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
1929                                      beacon_loss_count);
1930 
1931                 ieee80211_cqm_rssi_notify(&sdata->vif,
1932                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
1933                                           GFP_KERNEL);
1934         }
1935 
1936         /*
1937          * The driver/our work has already reported this event or the
1938          * connection monitoring has kicked in and we have already sent
1939          * a probe request. Or maybe the AP died and the driver keeps
1940          * reporting until we disassociate...
1941          *
1942          * In either case we have to ignore the current call to this
1943          * function (except for setting the correct probe reason bit)
1944          * because otherwise we would reset the timer every time and
1945          * never check whether we received a probe response!
1946          */
1947         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
1948                 already = true;
1949 
1950         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1951 
1952         mutex_unlock(&sdata->local->mtx);
1953 
1954         if (already)
1955                 goto out;
1956 
1957         mutex_lock(&sdata->local->iflist_mtx);
1958         ieee80211_recalc_ps(sdata->local, -1);
1959         mutex_unlock(&sdata->local->iflist_mtx);
1960 
1961         ifmgd->probe_send_count = 0;
1962         ieee80211_mgd_probe_ap_send(sdata);
1963  out:
1964         sdata_unlock(sdata);
1965 }
1966 
1967 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1968                                           struct ieee80211_vif *vif)
1969 {
1970         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1971         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1972         struct cfg80211_bss *cbss;
1973         struct sk_buff *skb;
1974         const u8 *ssid;
1975         int ssid_len;
1976 
1977         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1978                 return NULL;
1979 
1980         sdata_assert_lock(sdata);
1981 
1982         if (ifmgd->associated)
1983                 cbss = ifmgd->associated;
1984         else if (ifmgd->auth_data)
1985                 cbss = ifmgd->auth_data->bss;
1986         else if (ifmgd->assoc_data)
1987                 cbss = ifmgd->assoc_data->bss;
1988         else
1989                 return NULL;
1990 
1991         rcu_read_lock();
1992         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1993         if (WARN_ON_ONCE(ssid == NULL))
1994                 ssid_len = 0;
1995         else
1996                 ssid_len = ssid[1];
1997 
1998         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1999                                         (u32) -1, cbss->channel,
2000                                         ssid + 2, ssid_len,
2001                                         NULL, 0, true);
2002         rcu_read_unlock();
2003 
2004         return skb;
2005 }
2006 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2007 
2008 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2009 {
2010         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2011         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2012 
2013         sdata_lock(sdata);
2014         if (!ifmgd->associated) {
2015                 sdata_unlock(sdata);
2016                 return;
2017         }
2018 
2019         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2020                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2021                                true, frame_buf);
2022         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2023         sdata->vif.csa_active = false;
2024         ieee80211_wake_queues_by_reason(&sdata->local->hw,
2025                                         IEEE80211_MAX_QUEUE_MAP,
2026                                         IEEE80211_QUEUE_STOP_REASON_CSA);
2027 
2028         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2029                               IEEE80211_DEAUTH_FRAME_LEN);
2030         sdata_unlock(sdata);
2031 }
2032 
2033 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2034 {
2035         struct ieee80211_sub_if_data *sdata =
2036                 container_of(work, struct ieee80211_sub_if_data,
2037                              u.mgd.beacon_connection_loss_work);
2038         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2039         struct sta_info *sta;
2040 
2041         if (ifmgd->associated) {
2042                 rcu_read_lock();
2043                 sta = sta_info_get(sdata, ifmgd->bssid);
2044                 if (sta)
2045                         sta->beacon_loss_count++;
2046                 rcu_read_unlock();
2047         }
2048 
2049         if (ifmgd->connection_loss) {
2050                 sdata_info(sdata, "Connection to AP %pM lost\n",
2051                            ifmgd->bssid);
2052                 __ieee80211_disconnect(sdata);
2053         } else {
2054                 ieee80211_mgd_probe_ap(sdata, true);
2055         }
2056 }
2057 
2058 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2059 {
2060         struct ieee80211_sub_if_data *sdata =
2061                 container_of(work, struct ieee80211_sub_if_data,
2062                              u.mgd.csa_connection_drop_work);
2063 
2064         __ieee80211_disconnect(sdata);
2065 }
2066 
2067 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2068 {
2069         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2070         struct ieee80211_hw *hw = &sdata->local->hw;
2071 
2072         trace_api_beacon_loss(sdata);
2073 
2074         sdata->u.mgd.connection_loss = false;
2075         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2076 }
2077 EXPORT_SYMBOL(ieee80211_beacon_loss);
2078 
2079 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2080 {
2081         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2082         struct ieee80211_hw *hw = &sdata->local->hw;
2083 
2084         trace_api_connection_loss(sdata);
2085 
2086         sdata->u.mgd.connection_loss = true;
2087         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2088 }
2089 EXPORT_SYMBOL(ieee80211_connection_loss);
2090 
2091 
2092 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2093                                         bool assoc)
2094 {
2095         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2096 
2097         sdata_assert_lock(sdata);
2098 
2099         if (!assoc) {
2100                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2101 
2102                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2103                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2104                 sdata->u.mgd.flags = 0;
2105                 mutex_lock(&sdata->local->mtx);
2106                 ieee80211_vif_release_channel(sdata);
2107                 mutex_unlock(&sdata->local->mtx);
2108         }
2109 
2110         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2111         kfree(auth_data);
2112         sdata->u.mgd.auth_data = NULL;
2113 }
2114 
2115 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2116                                      struct ieee80211_mgmt *mgmt, size_t len)
2117 {
2118         struct ieee80211_local *local = sdata->local;
2119         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2120         u8 *pos;
2121         struct ieee802_11_elems elems;
2122         u32 tx_flags = 0;
2123 
2124         pos = mgmt->u.auth.variable;
2125         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2126         if (!elems.challenge)
2127                 return;
2128         auth_data->expected_transaction = 4;
2129         drv_mgd_prepare_tx(sdata->local, sdata);
2130         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2131                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2132                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2133         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2134                             elems.challenge - 2, elems.challenge_len + 2,
2135                             auth_data->bss->bssid, auth_data->bss->bssid,
2136                             auth_data->key, auth_data->key_len,
2137                             auth_data->key_idx, tx_flags);
2138 }
2139 
2140 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2141                                    struct ieee80211_mgmt *mgmt, size_t len)
2142 {
2143         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2144         u8 bssid[ETH_ALEN];
2145         u16 auth_alg, auth_transaction, status_code;
2146         struct sta_info *sta;
2147 
2148         sdata_assert_lock(sdata);
2149 
2150         if (len < 24 + 6)
2151                 return;
2152 
2153         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2154                 return;
2155 
2156         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2157 
2158         if (!ether_addr_equal(bssid, mgmt->bssid))
2159                 return;
2160 
2161         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2162         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2163         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2164 
2165         if (auth_alg != ifmgd->auth_data->algorithm ||
2166             auth_transaction != ifmgd->auth_data->expected_transaction) {
2167                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2168                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2169                            auth_transaction,
2170                            ifmgd->auth_data->expected_transaction);
2171                 return;
2172         }
2173 
2174         if (status_code != WLAN_STATUS_SUCCESS) {
2175                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2176                            mgmt->sa, status_code);
2177                 ieee80211_destroy_auth_data(sdata, false);
2178                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2179                 return;
2180         }
2181 
2182         switch (ifmgd->auth_data->algorithm) {
2183         case WLAN_AUTH_OPEN:
2184         case WLAN_AUTH_LEAP:
2185         case WLAN_AUTH_FT:
2186         case WLAN_AUTH_SAE:
2187                 break;
2188         case WLAN_AUTH_SHARED_KEY:
2189                 if (ifmgd->auth_data->expected_transaction != 4) {
2190                         ieee80211_auth_challenge(sdata, mgmt, len);
2191                         /* need another frame */
2192                         return;
2193                 }
2194                 break;
2195         default:
2196                 WARN_ONCE(1, "invalid auth alg %d",
2197                           ifmgd->auth_data->algorithm);
2198                 return;
2199         }
2200 
2201         sdata_info(sdata, "authenticated\n");
2202         ifmgd->auth_data->done = true;
2203         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2204         ifmgd->auth_data->timeout_started = true;
2205         run_again(sdata, ifmgd->auth_data->timeout);
2206 
2207         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2208             ifmgd->auth_data->expected_transaction != 2) {
2209                 /*
2210                  * Report auth frame to user space for processing since another
2211                  * round of Authentication frames is still needed.
2212                  */
2213                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2214                 return;
2215         }
2216 
2217         /* move station state to auth */
2218         mutex_lock(&sdata->local->sta_mtx);
2219         sta = sta_info_get(sdata, bssid);
2220         if (!sta) {
2221                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2222                 goto out_err;
2223         }
2224         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2225                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2226                 goto out_err;
2227         }
2228         mutex_unlock(&sdata->local->sta_mtx);
2229 
2230         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2231         return;
2232  out_err:
2233         mutex_unlock(&sdata->local->sta_mtx);
2234         /* ignore frame -- wait for timeout */
2235 }
2236 
2237 
2238 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2239                                      struct ieee80211_mgmt *mgmt, size_t len)
2240 {
2241         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2242         const u8 *bssid = NULL;
2243         u16 reason_code;
2244 
2245         sdata_assert_lock(sdata);
2246 
2247         if (len < 24 + 2)
2248                 return;
2249 
2250         if (!ifmgd->associated ||
2251             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2252                 return;
2253 
2254         bssid = ifmgd->associated->bssid;
2255 
2256         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2257 
2258         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2259                    bssid, reason_code);
2260 
2261         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2262 
2263         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2264 }
2265 
2266 
2267 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2268                                        struct ieee80211_mgmt *mgmt, size_t len)
2269 {
2270         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2271         u16 reason_code;
2272 
2273         sdata_assert_lock(sdata);
2274 
2275         if (len < 24 + 2)
2276                 return;
2277 
2278         if (!ifmgd->associated ||
2279             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2280                 return;
2281 
2282         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2283 
2284         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2285                    mgmt->sa, reason_code);
2286 
2287         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2288 
2289         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2290 }
2291 
2292 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2293                                 u8 *supp_rates, unsigned int supp_rates_len,
2294                                 u32 *rates, u32 *basic_rates,
2295                                 bool *have_higher_than_11mbit,
2296                                 int *min_rate, int *min_rate_index,
2297                                 int shift, u32 rate_flags)
2298 {
2299         int i, j;
2300 
2301         for (i = 0; i < supp_rates_len; i++) {
2302                 int rate = supp_rates[i] & 0x7f;
2303                 bool is_basic = !!(supp_rates[i] & 0x80);
2304 
2305                 if ((rate * 5 * (1 << shift)) > 110)
2306                         *have_higher_than_11mbit = true;
2307 
2308                 /*
2309                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2310                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2311                  *
2312                  * Note: Even through the membership selector and the basic
2313                  *       rate flag share the same bit, they are not exactly
2314                  *       the same.
2315                  */
2316                 if (!!(supp_rates[i] & 0x80) &&
2317                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2318                         continue;
2319 
2320                 for (j = 0; j < sband->n_bitrates; j++) {
2321                         struct ieee80211_rate *br;
2322                         int brate;
2323 
2324                         br = &sband->bitrates[j];
2325                         if ((rate_flags & br->flags) != rate_flags)
2326                                 continue;
2327 
2328                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2329                         if (brate == rate) {
2330                                 *rates |= BIT(j);
2331                                 if (is_basic)
2332                                         *basic_rates |= BIT(j);
2333                                 if ((rate * 5) < *min_rate) {
2334                                         *min_rate = rate * 5;
2335                                         *min_rate_index = j;
2336                                 }
2337                                 break;
2338                         }
2339                 }
2340         }
2341 }
2342 
2343 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2344                                          bool assoc)
2345 {
2346         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2347 
2348         sdata_assert_lock(sdata);
2349 
2350         if (!assoc) {
2351                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2352 
2353                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2354                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2355                 sdata->u.mgd.flags = 0;
2356                 mutex_lock(&sdata->local->mtx);
2357                 ieee80211_vif_release_channel(sdata);
2358                 mutex_unlock(&sdata->local->mtx);
2359         }
2360 
2361         kfree(assoc_data);
2362         sdata->u.mgd.assoc_data = NULL;
2363 }
2364 
2365 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2366                                     struct cfg80211_bss *cbss,
2367                                     struct ieee80211_mgmt *mgmt, size_t len)
2368 {
2369         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2370         struct ieee80211_local *local = sdata->local;
2371         struct ieee80211_supported_band *sband;
2372         struct sta_info *sta;
2373         u8 *pos;
2374         u16 capab_info, aid;
2375         struct ieee802_11_elems elems;
2376         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2377         const struct cfg80211_bss_ies *bss_ies = NULL;
2378         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2379         u32 changed = 0;
2380         int err;
2381         bool ret;
2382 
2383         /* AssocResp and ReassocResp have identical structure */
2384 
2385         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2386         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2387 
2388         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2389                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2390                            aid);
2391         aid &= ~(BIT(15) | BIT(14));
2392 
2393         ifmgd->broken_ap = false;
2394 
2395         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2396                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2397                            aid);
2398                 aid = 0;
2399                 ifmgd->broken_ap = true;
2400         }
2401 
2402         pos = mgmt->u.assoc_resp.variable;
2403         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2404 
2405         if (!elems.supp_rates) {
2406                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2407                 return false;
2408         }
2409 
2410         ifmgd->aid = aid;
2411 
2412         /*
2413          * Some APs are erroneously not including some information in their
2414          * (re)association response frames. Try to recover by using the data
2415          * from the beacon or probe response. This seems to afflict mobile
2416          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2417          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2418          */
2419         if ((assoc_data->wmm && !elems.wmm_param) ||
2420             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2421              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2422             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2423              (!elems.vht_cap_elem || !elems.vht_operation))) {
2424                 const struct cfg80211_bss_ies *ies;
2425                 struct ieee802_11_elems bss_elems;
2426 
2427                 rcu_read_lock();
2428                 ies = rcu_dereference(cbss->ies);
2429                 if (ies)
2430                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2431                                           GFP_ATOMIC);
2432                 rcu_read_unlock();
2433                 if (!bss_ies)
2434                         return false;
2435 
2436                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2437                                        false, &bss_elems);
2438                 if (assoc_data->wmm &&
2439                     !elems.wmm_param && bss_elems.wmm_param) {
2440                         elems.wmm_param = bss_elems.wmm_param;
2441                         sdata_info(sdata,
2442                                    "AP bug: WMM param missing from AssocResp\n");
2443                 }
2444 
2445                 /*
2446                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2447                  * have to include the IEs in the (re)association response.
2448                  */
2449                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2450                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2451                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2452                         sdata_info(sdata,
2453                                    "AP bug: HT capability missing from AssocResp\n");
2454                 }
2455                 if (!elems.ht_operation && bss_elems.ht_operation &&
2456                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2457                         elems.ht_operation = bss_elems.ht_operation;
2458                         sdata_info(sdata,
2459                                    "AP bug: HT operation missing from AssocResp\n");
2460                 }
2461                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2462                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2463                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2464                         sdata_info(sdata,
2465                                    "AP bug: VHT capa missing from AssocResp\n");
2466                 }
2467                 if (!elems.vht_operation && bss_elems.vht_operation &&
2468                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2469                         elems.vht_operation = bss_elems.vht_operation;
2470                         sdata_info(sdata,
2471                                    "AP bug: VHT operation missing from AssocResp\n");
2472                 }
2473         }
2474 
2475         /*
2476          * We previously checked these in the beacon/probe response, so
2477          * they should be present here. This is just a safety net.
2478          */
2479         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2480             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2481                 sdata_info(sdata,
2482                            "HT AP is missing WMM params or HT capability/operation\n");
2483                 ret = false;
2484                 goto out;
2485         }
2486 
2487         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2488             (!elems.vht_cap_elem || !elems.vht_operation)) {
2489                 sdata_info(sdata,
2490                            "VHT AP is missing VHT capability/operation\n");
2491                 ret = false;
2492                 goto out;
2493         }
2494 
2495         mutex_lock(&sdata->local->sta_mtx);
2496         /*
2497          * station info was already allocated and inserted before
2498          * the association and should be available to us
2499          */
2500         sta = sta_info_get(sdata, cbss->bssid);
2501         if (WARN_ON(!sta)) {
2502                 mutex_unlock(&sdata->local->sta_mtx);
2503                 ret = false;
2504                 goto out;
2505         }
2506 
2507         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2508 
2509         /* Set up internal HT/VHT capabilities */
2510         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2511                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2512                                                   elems.ht_cap_elem, sta);
2513 
2514         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2515                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2516                                                     elems.vht_cap_elem, sta);
2517 
2518         /*
2519          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2520          * in their association response, so ignore that data for our own
2521          * configuration. If it changed since the last beacon, we'll get the
2522          * next beacon and update then.
2523          */
2524 
2525         /*
2526          * If an operating mode notification IE is present, override the
2527          * NSS calculation (that would be done in rate_control_rate_init())
2528          * and use the # of streams from that element.
2529          */
2530         if (elems.opmode_notif &&
2531             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2532                 u8 nss;
2533 
2534                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2535                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2536                 nss += 1;
2537                 sta->sta.rx_nss = nss;
2538         }
2539 
2540         rate_control_rate_init(sta);
2541 
2542         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2543                 set_sta_flag(sta, WLAN_STA_MFP);
2544 
2545         if (elems.wmm_param)
2546                 set_sta_flag(sta, WLAN_STA_WME);
2547 
2548         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2549         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2550                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2551         if (err) {
2552                 sdata_info(sdata,
2553                            "failed to move station %pM to desired state\n",
2554                            sta->sta.addr);
2555                 WARN_ON(__sta_info_destroy(sta));
2556                 mutex_unlock(&sdata->local->sta_mtx);
2557                 ret = false;
2558                 goto out;
2559         }
2560 
2561         mutex_unlock(&sdata->local->sta_mtx);
2562 
2563         /*
2564          * Always handle WMM once after association regardless
2565          * of the first value the AP uses. Setting -1 here has
2566          * that effect because the AP values is an unsigned
2567          * 4-bit value.
2568          */
2569         ifmgd->wmm_last_param_set = -1;
2570 
2571         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2572                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2573                                          elems.wmm_param_len);
2574         else
2575                 ieee80211_set_wmm_default(sdata, false);
2576         changed |= BSS_CHANGED_QOS;
2577 
2578         /* set AID and assoc capability,
2579          * ieee80211_set_associated() will tell the driver */
2580         bss_conf->aid = aid;
2581         bss_conf->assoc_capability = capab_info;
2582         ieee80211_set_associated(sdata, cbss, changed);
2583 
2584         /*
2585          * If we're using 4-addr mode, let the AP know that we're
2586          * doing so, so that it can create the STA VLAN on its side
2587          */
2588         if (ifmgd->use_4addr)
2589                 ieee80211_send_4addr_nullfunc(local, sdata);
2590 
2591         /*
2592          * Start timer to probe the connection to the AP now.
2593          * Also start the timer that will detect beacon loss.
2594          */
2595         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2596         ieee80211_sta_reset_beacon_monitor(sdata);
2597 
2598         ret = true;
2599  out:
2600         kfree(bss_ies);
2601         return ret;
2602 }
2603 
2604 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2605                                          struct ieee80211_mgmt *mgmt,
2606                                          size_t len)
2607 {
2608         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2609         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2610         u16 capab_info, status_code, aid;
2611         struct ieee802_11_elems elems;
2612         u8 *pos;
2613         bool reassoc;
2614         struct cfg80211_bss *bss;
2615 
2616         sdata_assert_lock(sdata);
2617 
2618         if (!assoc_data)
2619                 return;
2620         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2621                 return;
2622 
2623         /*
2624          * AssocResp and ReassocResp have identical structure, so process both
2625          * of them in this function.
2626          */
2627 
2628         if (len < 24 + 6)
2629                 return;
2630 
2631         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2632         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2633         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2634         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2635 
2636         sdata_info(sdata,
2637                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2638                    reassoc ? "Rea" : "A", mgmt->sa,
2639                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2640 
2641         pos = mgmt->u.assoc_resp.variable;
2642         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2643 
2644         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2645             elems.timeout_int &&
2646             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2647                 u32 tu, ms;
2648                 tu = le32_to_cpu(elems.timeout_int->value);
2649                 ms = tu * 1024 / 1000;
2650                 sdata_info(sdata,
2651                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2652                            mgmt->sa, tu, ms);
2653                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2654                 assoc_data->timeout_started = true;
2655                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2656                         run_again(sdata, assoc_data->timeout);
2657                 return;
2658         }
2659 
2660         bss = assoc_data->bss;
2661 
2662         if (status_code != WLAN_STATUS_SUCCESS) {
2663                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2664                            mgmt->sa, status_code);
2665                 ieee80211_destroy_assoc_data(sdata, false);
2666         } else {
2667                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2668                         /* oops -- internal error -- send timeout for now */
2669                         ieee80211_destroy_assoc_data(sdata, false);
2670                         cfg80211_assoc_timeout(sdata->dev, bss);
2671                         return;
2672                 }
2673                 sdata_info(sdata, "associated\n");
2674 
2675                 /*
2676                  * destroy assoc_data afterwards, as otherwise an idle
2677                  * recalc after assoc_data is NULL but before associated
2678                  * is set can cause the interface to go idle
2679                  */
2680                 ieee80211_destroy_assoc_data(sdata, true);
2681         }
2682 
2683         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
2684 }
2685 
2686 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2687                                   struct ieee80211_mgmt *mgmt, size_t len,
2688                                   struct ieee80211_rx_status *rx_status,
2689                                   struct ieee802_11_elems *elems)
2690 {
2691         struct ieee80211_local *local = sdata->local;
2692         int freq;
2693         struct ieee80211_bss *bss;
2694         struct ieee80211_channel *channel;
2695 
2696         sdata_assert_lock(sdata);
2697 
2698         if (elems->ds_params)
2699                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2700                                                       rx_status->band);
2701         else
2702                 freq = rx_status->freq;
2703 
2704         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2705 
2706         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2707                 return;
2708 
2709         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2710                                         channel);
2711         if (bss) {
2712                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2713                 ieee80211_rx_bss_put(local, bss);
2714         }
2715 }
2716 
2717 
2718 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2719                                          struct sk_buff *skb)
2720 {
2721         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2722         struct ieee80211_if_managed *ifmgd;
2723         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2724         size_t baselen, len = skb->len;
2725         struct ieee802_11_elems elems;
2726 
2727         ifmgd = &sdata->u.mgd;
2728 
2729         sdata_assert_lock(sdata);
2730 
2731         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2732                 return; /* ignore ProbeResp to foreign address */
2733 
2734         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2735         if (baselen > len)
2736                 return;
2737 
2738         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2739                                false, &elems);
2740 
2741         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2742 
2743         if (ifmgd->associated &&
2744             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2745                 ieee80211_reset_ap_probe(sdata);
2746 
2747         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2748             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2749                 /* got probe response, continue with auth */
2750                 sdata_info(sdata, "direct probe responded\n");
2751                 ifmgd->auth_data->tries = 0;
2752                 ifmgd->auth_data->timeout = jiffies;
2753                 ifmgd->auth_data->timeout_started = true;
2754                 run_again(sdata, ifmgd->auth_data->timeout);
2755         }
2756 }
2757 
2758 /*
2759  * This is the canonical list of information elements we care about,
2760  * the filter code also gives us all changes to the Microsoft OUI
2761  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2762  *
2763  * We implement beacon filtering in software since that means we can
2764  * avoid processing the frame here and in cfg80211, and userspace
2765  * will not be able to tell whether the hardware supports it or not.
2766  *
2767  * XXX: This list needs to be dynamic -- userspace needs to be able to
2768  *      add items it requires. It also needs to be able to tell us to
2769  *      look out for other vendor IEs.
2770  */
2771 static const u64 care_about_ies =
2772         (1ULL << WLAN_EID_COUNTRY) |
2773         (1ULL << WLAN_EID_ERP_INFO) |
2774         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2775         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2776         (1ULL << WLAN_EID_HT_CAPABILITY) |
2777         (1ULL << WLAN_EID_HT_OPERATION);
2778 
2779 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2780                                      struct ieee80211_mgmt *mgmt, size_t len,
2781                                      struct ieee80211_rx_status *rx_status)
2782 {
2783         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2784         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2785         size_t baselen;
2786         struct ieee802_11_elems elems;
2787         struct ieee80211_local *local = sdata->local;
2788         struct ieee80211_chanctx_conf *chanctx_conf;
2789         struct ieee80211_channel *chan;
2790         struct sta_info *sta;
2791         u32 changed = 0;
2792         bool erp_valid;
2793         u8 erp_value = 0;
2794         u32 ncrc;
2795         u8 *bssid;
2796         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2797 
2798         sdata_assert_lock(sdata);
2799 
2800         /* Process beacon from the current BSS */
2801         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2802         if (baselen > len)
2803                 return;
2804 
2805         rcu_read_lock();
2806         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2807         if (!chanctx_conf) {
2808                 rcu_read_unlock();
2809                 return;
2810         }
2811 
2812         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2813                 rcu_read_unlock();
2814                 return;
2815         }
2816         chan = chanctx_conf->def.chan;
2817         rcu_read_unlock();
2818 
2819         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2820             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2821                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2822                                        len - baselen, false, &elems);
2823 
2824                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2825                 if (elems.tim && !elems.parse_error) {
2826                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
2827                         ifmgd->dtim_period = tim_ie->dtim_period;
2828                 }
2829                 ifmgd->have_beacon = true;
2830                 ifmgd->assoc_data->need_beacon = false;
2831                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2832                         sdata->vif.bss_conf.sync_tsf =
2833                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2834                         sdata->vif.bss_conf.sync_device_ts =
2835                                 rx_status->device_timestamp;
2836                         if (elems.tim)
2837                                 sdata->vif.bss_conf.sync_dtim_count =
2838                                         elems.tim->dtim_count;
2839                         else
2840                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2841                 }
2842                 /* continue assoc process */
2843                 ifmgd->assoc_data->timeout = jiffies;
2844                 ifmgd->assoc_data->timeout_started = true;
2845                 run_again(sdata, ifmgd->assoc_data->timeout);
2846                 return;
2847         }
2848 
2849         if (!ifmgd->associated ||
2850             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2851                 return;
2852         bssid = ifmgd->associated->bssid;
2853 
2854         /* Track average RSSI from the Beacon frames of the current AP */
2855         ifmgd->last_beacon_signal = rx_status->signal;
2856         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2857                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2858                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2859                 ifmgd->last_cqm_event_signal = 0;
2860                 ifmgd->count_beacon_signal = 1;
2861                 ifmgd->last_ave_beacon_signal = 0;
2862         } else {
2863                 ifmgd->ave_beacon_signal =
2864                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2865                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2866                          ifmgd->ave_beacon_signal) / 16;
2867                 ifmgd->count_beacon_signal++;
2868         }
2869 
2870         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2871             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2872                 int sig = ifmgd->ave_beacon_signal / 16;
2873                 int last_sig = ifmgd->last_ave_beacon_signal;
2874 
2875                 /*
2876                  * if signal crosses either of the boundaries, invoke callback
2877                  * with appropriate parameters
2878                  */
2879                 if (sig > ifmgd->rssi_max_thold &&
2880                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2881                         ifmgd->last_ave_beacon_signal = sig;
2882                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2883                 } else if (sig < ifmgd->rssi_min_thold &&
2884                            (last_sig >= ifmgd->rssi_max_thold ||
2885                            last_sig == 0)) {
2886                         ifmgd->last_ave_beacon_signal = sig;
2887                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2888                 }
2889         }
2890 
2891         if (bss_conf->cqm_rssi_thold &&
2892             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2893             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2894                 int sig = ifmgd->ave_beacon_signal / 16;
2895                 int last_event = ifmgd->last_cqm_event_signal;
2896                 int thold = bss_conf->cqm_rssi_thold;
2897                 int hyst = bss_conf->cqm_rssi_hyst;
2898                 if (sig < thold &&
2899                     (last_event == 0 || sig < last_event - hyst)) {
2900                         ifmgd->last_cqm_event_signal = sig;
2901                         ieee80211_cqm_rssi_notify(
2902                                 &sdata->vif,
2903                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2904                                 GFP_KERNEL);
2905                 } else if (sig > thold &&
2906                            (last_event == 0 || sig > last_event + hyst)) {
2907                         ifmgd->last_cqm_event_signal = sig;
2908                         ieee80211_cqm_rssi_notify(
2909                                 &sdata->vif,
2910                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2911                                 GFP_KERNEL);
2912                 }
2913         }
2914 
2915         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
2916                 mlme_dbg_ratelimited(sdata,
2917                                      "cancelling AP probe due to a received beacon\n");
2918                 ieee80211_reset_ap_probe(sdata);
2919         }
2920 
2921         /*
2922          * Push the beacon loss detection into the future since
2923          * we are processing a beacon from the AP just now.
2924          */
2925         ieee80211_sta_reset_beacon_monitor(sdata);
2926 
2927         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2928         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2929                                           len - baselen, false, &elems,
2930                                           care_about_ies, ncrc);
2931 
2932         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2933                 bool directed_tim = ieee80211_check_tim(elems.tim,
2934                                                         elems.tim_len,
2935                                                         ifmgd->aid);
2936                 if (directed_tim) {
2937                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2938                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2939                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2940                                         ieee80211_hw_config(local,
2941                                                             IEEE80211_CONF_CHANGE_PS);
2942                                 }
2943                                 ieee80211_send_nullfunc(local, sdata, 0);
2944                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2945                                 local->pspolling = true;
2946 
2947                                 /*
2948                                  * Here is assumed that the driver will be
2949                                  * able to send ps-poll frame and receive a
2950                                  * response even though power save mode is
2951                                  * enabled, but some drivers might require
2952                                  * to disable power save here. This needs
2953                                  * to be investigated.
2954                                  */
2955                                 ieee80211_send_pspoll(local, sdata);
2956                         }
2957                 }
2958         }
2959 
2960         if (sdata->vif.p2p) {
2961                 struct ieee80211_p2p_noa_attr noa = {};
2962                 int ret;
2963 
2964                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2965                                             len - baselen,
2966                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2967                                             (u8 *) &noa, sizeof(noa));
2968                 if (ret >= 2) {
2969                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
2970                                 /* valid noa_attr and index changed */
2971                                 sdata->u.mgd.p2p_noa_index = noa.index;
2972                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
2973                                 changed |= BSS_CHANGED_P2P_PS;
2974                                 /*
2975                                  * make sure we update all information, the CRC
2976                                  * mechanism doesn't look at P2P attributes.
2977                                  */
2978                                 ifmgd->beacon_crc_valid = false;
2979                         }
2980                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
2981                         /* noa_attr not found and we had valid noa_attr before */
2982                         sdata->u.mgd.p2p_noa_index = -1;
2983                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
2984                         changed |= BSS_CHANGED_P2P_PS;
2985                         ifmgd->beacon_crc_valid = false;
2986                 }
2987         }
2988 
2989         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2990                 return;
2991         ifmgd->beacon_crc = ncrc;
2992         ifmgd->beacon_crc_valid = true;
2993 
2994         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2995 
2996         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
2997                                          &elems, true);
2998 
2999         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3000             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3001                                      elems.wmm_param_len))
3002                 changed |= BSS_CHANGED_QOS;
3003 
3004         /*
3005          * If we haven't had a beacon before, tell the driver about the
3006          * DTIM period (and beacon timing if desired) now.
3007          */
3008         if (!ifmgd->have_beacon) {
3009                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3010                 if (elems.tim)
3011                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3012                 else
3013                         bss_conf->dtim_period = 1;
3014 
3015                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3016                         sdata->vif.bss_conf.sync_tsf =
3017                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3018                         sdata->vif.bss_conf.sync_device_ts =
3019                                 rx_status->device_timestamp;
3020                         if (elems.tim)
3021                                 sdata->vif.bss_conf.sync_dtim_count =
3022                                         elems.tim->dtim_count;
3023                         else
3024                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3025                 }
3026 
3027                 changed |= BSS_CHANGED_BEACON_INFO;
3028                 ifmgd->have_beacon = true;
3029 
3030                 mutex_lock(&local->iflist_mtx);
3031                 ieee80211_recalc_ps(local, -1);
3032                 mutex_unlock(&local->iflist_mtx);
3033 
3034                 ieee80211_recalc_ps_vif(sdata);
3035         }
3036 
3037         if (elems.erp_info) {
3038                 erp_valid = true;
3039                 erp_value = elems.erp_info[0];
3040         } else {
3041                 erp_valid = false;
3042         }
3043         changed |= ieee80211_handle_bss_capability(sdata,
3044                         le16_to_cpu(mgmt->u.beacon.capab_info),
3045                         erp_valid, erp_value);
3046 
3047         mutex_lock(&local->sta_mtx);
3048         sta = sta_info_get(sdata, bssid);
3049 
3050         if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3051                                 elems.vht_operation, bssid, &changed)) {
3052                 mutex_unlock(&local->sta_mtx);
3053                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3054                                        WLAN_REASON_DEAUTH_LEAVING,
3055                                        true, deauth_buf);
3056                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3057                                       sizeof(deauth_buf));
3058                 return;
3059         }
3060 
3061         if (sta && elems.opmode_notif)
3062                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3063                                             rx_status->band, true);
3064         mutex_unlock(&local->sta_mtx);
3065 
3066         if (elems.country_elem && elems.pwr_constr_elem &&
3067             mgmt->u.probe_resp.capab_info &
3068                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3069                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3070                                                        elems.country_elem,
3071                                                        elems.country_elem_len,
3072                                                        elems.pwr_constr_elem);
3073 
3074         ieee80211_bss_info_change_notify(sdata, changed);
3075 }
3076 
3077 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3078                                   struct sk_buff *skb)
3079 {
3080         struct ieee80211_rx_status *rx_status;
3081         struct ieee80211_mgmt *mgmt;
3082         u16 fc;
3083         struct ieee802_11_elems elems;
3084         int ies_len;
3085 
3086         rx_status = (struct ieee80211_rx_status *) skb->cb;
3087         mgmt = (struct ieee80211_mgmt *) skb->data;
3088         fc = le16_to_cpu(mgmt->frame_control);
3089 
3090         sdata_lock(sdata);
3091 
3092         switch (fc & IEEE80211_FCTL_STYPE) {
3093         case IEEE80211_STYPE_BEACON:
3094                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3095                 break;
3096         case IEEE80211_STYPE_PROBE_RESP:
3097                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3098                 break;
3099         case IEEE80211_STYPE_AUTH:
3100                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3101                 break;
3102         case IEEE80211_STYPE_DEAUTH:
3103                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3104                 break;
3105         case IEEE80211_STYPE_DISASSOC:
3106                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3107                 break;
3108         case IEEE80211_STYPE_ASSOC_RESP:
3109         case IEEE80211_STYPE_REASSOC_RESP:
3110                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3111                 break;
3112         case IEEE80211_STYPE_ACTION:
3113                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3114                         ies_len = skb->len -
3115                                   offsetof(struct ieee80211_mgmt,
3116                                            u.action.u.chan_switch.variable);
3117 
3118                         if (ies_len < 0)
3119                                 break;
3120 
3121                         ieee802_11_parse_elems(
3122                                 mgmt->u.action.u.chan_switch.variable,
3123                                 ies_len, true, &elems);
3124 
3125                         if (elems.parse_error)
3126                                 break;
3127 
3128                         ieee80211_sta_process_chanswitch(sdata,
3129                                                          rx_status->mactime,
3130                                                          &elems, false);
3131                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3132                         ies_len = skb->len -
3133                                   offsetof(struct ieee80211_mgmt,
3134                                            u.action.u.ext_chan_switch.variable);
3135 
3136                         if (ies_len < 0)
3137                                 break;
3138 
3139                         ieee802_11_parse_elems(
3140                                 mgmt->u.action.u.ext_chan_switch.variable,
3141                                 ies_len, true, &elems);
3142 
3143                         if (elems.parse_error)
3144                                 break;
3145 
3146                         /* for the handling code pretend this was also an IE */
3147                         elems.ext_chansw_ie =
3148                                 &mgmt->u.action.u.ext_chan_switch.data;
3149 
3150                         ieee80211_sta_process_chanswitch(sdata,
3151                                                          rx_status->mactime,
3152                                                          &elems, false);
3153                 }
3154                 break;
3155         }
3156         sdata_unlock(sdata);
3157 }
3158 
3159 static void ieee80211_sta_timer(unsigned long data)
3160 {
3161         struct ieee80211_sub_if_data *sdata =
3162                 (struct ieee80211_sub_if_data *) data;
3163 
3164         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3165 }
3166 
3167 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3168                                           u8 *bssid, u8 reason, bool tx)
3169 {
3170         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3171 
3172         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3173                                tx, frame_buf);
3174 
3175         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3176                               IEEE80211_DEAUTH_FRAME_LEN);
3177 }
3178 
3179 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3180 {
3181         struct ieee80211_local *local = sdata->local;
3182         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3183         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3184         u32 tx_flags = 0;
3185 
3186         sdata_assert_lock(sdata);
3187 
3188         if (WARN_ON_ONCE(!auth_data))
3189                 return -EINVAL;
3190 
3191         auth_data->tries++;
3192 
3193         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3194                 sdata_info(sdata, "authentication with %pM timed out\n",
3195                            auth_data->bss->bssid);
3196 
3197                 /*
3198                  * Most likely AP is not in the range so remove the
3199                  * bss struct for that AP.
3200                  */
3201                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3202 
3203                 return -ETIMEDOUT;
3204         }
3205 
3206         drv_mgd_prepare_tx(local, sdata);
3207 
3208         if (auth_data->bss->proberesp_ies) {
3209                 u16 trans = 1;
3210                 u16 status = 0;
3211 
3212                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3213                            auth_data->bss->bssid, auth_data->tries,
3214                            IEEE80211_AUTH_MAX_TRIES);
3215 
3216                 auth_data->expected_transaction = 2;
3217 
3218                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3219                         trans = auth_data->sae_trans;
3220                         status = auth_data->sae_status;
3221                         auth_data->expected_transaction = trans;
3222                 }
3223 
3224                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3225                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3226                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3227 
3228                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3229                                     auth_data->data, auth_data->data_len,
3230                                     auth_data->bss->bssid,
3231                                     auth_data->bss->bssid, NULL, 0, 0,
3232                                     tx_flags);
3233         } else {
3234                 const u8 *ssidie;
3235 
3236                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3237                            auth_data->bss->bssid, auth_data->tries,
3238                            IEEE80211_AUTH_MAX_TRIES);
3239 
3240                 rcu_read_lock();
3241                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3242                 if (!ssidie) {
3243                         rcu_read_unlock();
3244                         return -EINVAL;
3245                 }
3246                 /*
3247                  * Direct probe is sent to broadcast address as some APs
3248                  * will not answer to direct packet in unassociated state.
3249                  */
3250                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3251                                          NULL, 0, (u32) -1, true, 0,
3252                                          auth_data->bss->channel, false);
3253                 rcu_read_unlock();
3254         }
3255 
3256         if (tx_flags == 0) {
3257                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3258                 auth_data->timeout_started = true;
3259                 run_again(sdata, auth_data->timeout);
3260         } else {
3261                 auth_data->timeout =
3262                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3263                 auth_data->timeout_started = true;
3264                 run_again(sdata, auth_data->timeout);
3265         }
3266 
3267         return 0;
3268 }
3269 
3270 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3271 {
3272         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3273         struct ieee80211_local *local = sdata->local;
3274 
3275         sdata_assert_lock(sdata);
3276 
3277         assoc_data->tries++;
3278         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3279                 sdata_info(sdata, "association with %pM timed out\n",
3280                            assoc_data->bss->bssid);
3281 
3282                 /*
3283                  * Most likely AP is not in the range so remove the
3284                  * bss struct for that AP.
3285                  */
3286                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3287 
3288                 return -ETIMEDOUT;
3289         }
3290 
3291         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3292                    assoc_data->bss->bssid, assoc_data->tries,
3293                    IEEE80211_ASSOC_MAX_TRIES);
3294         ieee80211_send_assoc(sdata);
3295 
3296         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3297                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3298                 assoc_data->timeout_started = true;
3299                 run_again(sdata, assoc_data->timeout);
3300         } else {
3301                 assoc_data->timeout =
3302                         round_jiffies_up(jiffies +
3303                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3304                 assoc_data->timeout_started = true;
3305                 run_again(sdata, assoc_data->timeout);
3306         }
3307 
3308         return 0;
3309 }
3310 
3311 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3312                                   __le16 fc, bool acked)
3313 {
3314         struct ieee80211_local *local = sdata->local;
3315 
3316         sdata->u.mgd.status_fc = fc;
3317         sdata->u.mgd.status_acked = acked;
3318         sdata->u.mgd.status_received = true;
3319 
3320         ieee80211_queue_work(&local->hw, &sdata->work);
3321 }
3322 
3323 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3324 {
3325         struct ieee80211_local *local = sdata->local;
3326         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3327 
3328         sdata_lock(sdata);
3329 
3330         if (ifmgd->status_received) {
3331                 __le16 fc = ifmgd->status_fc;
3332                 bool status_acked = ifmgd->status_acked;
3333 
3334                 ifmgd->status_received = false;
3335                 if (ifmgd->auth_data &&
3336                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3337                         if (status_acked) {
3338                                 ifmgd->auth_data->timeout =
3339                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3340                                 run_again(sdata, ifmgd->auth_data->timeout);
3341                         } else {
3342                                 ifmgd->auth_data->timeout = jiffies - 1;
3343                         }
3344                         ifmgd->auth_data->timeout_started = true;
3345                 } else if (ifmgd->assoc_data &&
3346                            (ieee80211_is_assoc_req(fc) ||
3347                             ieee80211_is_reassoc_req(fc))) {
3348                         if (status_acked) {
3349                                 ifmgd->assoc_data->timeout =
3350                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3351                                 run_again(sdata, ifmgd->assoc_data->timeout);
3352                         } else {
3353                                 ifmgd->assoc_data->timeout = jiffies - 1;
3354                         }
3355                         ifmgd->assoc_data->timeout_started = true;
3356                 }
3357         }
3358 
3359         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3360             time_after(jiffies, ifmgd->auth_data->timeout)) {
3361                 if (ifmgd->auth_data->done) {
3362                         /*
3363                          * ok ... we waited for assoc but userspace didn't,
3364                          * so let's just kill the auth data
3365                          */
3366                         ieee80211_destroy_auth_data(sdata, false);
3367                 } else if (ieee80211_probe_auth(sdata)) {
3368                         u8 bssid[ETH_ALEN];
3369 
3370                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3371 
3372                         ieee80211_destroy_auth_data(sdata, false);
3373 
3374                         cfg80211_auth_timeout(sdata->dev, bssid);
3375                 }
3376         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3377                 run_again(sdata, ifmgd->auth_data->timeout);
3378 
3379         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3380             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3381                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3382                     ieee80211_do_assoc(sdata)) {
3383                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3384 
3385                         ieee80211_destroy_assoc_data(sdata, false);
3386                         cfg80211_assoc_timeout(sdata->dev, bss);
3387                 }
3388         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3389                 run_again(sdata, ifmgd->assoc_data->timeout);
3390 
3391         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3392             ifmgd->associated) {
3393                 u8 bssid[ETH_ALEN];
3394                 int max_tries;
3395 
3396                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3397 
3398                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3399                         max_tries = max_nullfunc_tries;
3400                 else
3401                         max_tries = max_probe_tries;
3402 
3403                 /* ACK received for nullfunc probing frame */
3404                 if (!ifmgd->probe_send_count)
3405                         ieee80211_reset_ap_probe(sdata);
3406                 else if (ifmgd->nullfunc_failed) {
3407                         if (ifmgd->probe_send_count < max_tries) {
3408                                 mlme_dbg(sdata,
3409                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3410                                          bssid, ifmgd->probe_send_count,
3411                                          max_tries);
3412                                 ieee80211_mgd_probe_ap_send(sdata);
3413                         } else {
3414                                 mlme_dbg(sdata,
3415                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3416                                          bssid);
3417                                 ieee80211_sta_connection_lost(sdata, bssid,
3418                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3419                                         false);
3420                         }
3421                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3422                         run_again(sdata, ifmgd->probe_timeout);
3423                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3424                         mlme_dbg(sdata,
3425                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3426                                  bssid, probe_wait_ms);
3427                         ieee80211_sta_connection_lost(sdata, bssid,
3428                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3429                 } else if (ifmgd->probe_send_count < max_tries) {
3430                         mlme_dbg(sdata,
3431                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3432                                  bssid, probe_wait_ms,
3433                                  ifmgd->probe_send_count, max_tries);
3434                         ieee80211_mgd_probe_ap_send(sdata);
3435                 } else {
3436                         /*
3437                          * We actually lost the connection ... or did we?
3438                          * Let's make sure!
3439                          */
3440                         wiphy_debug(local->hw.wiphy,
3441                                     "%s: No probe response from AP %pM"
3442                                     " after %dms, disconnecting.\n",
3443                                     sdata->name,
3444                                     bssid, probe_wait_ms);
3445 
3446                         ieee80211_sta_connection_lost(sdata, bssid,
3447                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3448                 }
3449         }
3450 
3451         sdata_unlock(sdata);
3452 }
3453 
3454 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3455 {
3456         struct ieee80211_sub_if_data *sdata =
3457                 (struct ieee80211_sub_if_data *) data;
3458         struct ieee80211_local *local = sdata->local;
3459 
3460         if (local->quiescing)
3461                 return;
3462 
3463         sdata->u.mgd.connection_loss = false;
3464         ieee80211_queue_work(&sdata->local->hw,
3465                              &sdata->u.mgd.beacon_connection_loss_work);
3466 }
3467 
3468 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3469 {
3470         struct ieee80211_sub_if_data *sdata =
3471                 (struct ieee80211_sub_if_data *) data;
3472         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3473         struct ieee80211_local *local = sdata->local;
3474 
3475         if (local->quiescing)
3476                 return;
3477 
3478         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3479 }
3480 
3481 static void ieee80211_sta_monitor_work(struct work_struct *work)
3482 {
3483         struct ieee80211_sub_if_data *sdata =
3484                 container_of(work, struct ieee80211_sub_if_data,
3485                              u.mgd.monitor_work);
3486 
3487         ieee80211_mgd_probe_ap(sdata, false);
3488 }
3489 
3490 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3491 {
3492         u32 flags;
3493 
3494         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3495                 __ieee80211_stop_poll(sdata);
3496 
3497                 /* let's probe the connection once */
3498                 flags = sdata->local->hw.flags;
3499                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3500                         ieee80211_queue_work(&sdata->local->hw,
3501                                              &sdata->u.mgd.monitor_work);
3502                 /* and do all the other regular work too */
3503                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3504         }
3505 }
3506 
3507 #ifdef CONFIG_PM
3508 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3509 {
3510         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3511         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3512 
3513         sdata_lock(sdata);
3514 
3515         if (ifmgd->auth_data || ifmgd->assoc_data) {
3516                 const u8 *bssid = ifmgd->auth_data ?
3517                                 ifmgd->auth_data->bss->bssid :
3518                                 ifmgd->assoc_data->bss->bssid;
3519 
3520                 /*
3521                  * If we are trying to authenticate / associate while suspending,
3522                  * cfg80211 won't know and won't actually abort those attempts,
3523                  * thus we need to do that ourselves.
3524                  */
3525                 ieee80211_send_deauth_disassoc(sdata, bssid,
3526                                                IEEE80211_STYPE_DEAUTH,
3527                                                WLAN_REASON_DEAUTH_LEAVING,
3528                                                false, frame_buf);
3529                 if (ifmgd->assoc_data)
3530                         ieee80211_destroy_assoc_data(sdata, false);
3531                 if (ifmgd->auth_data)
3532                         ieee80211_destroy_auth_data(sdata, false);
3533                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3534                                       IEEE80211_DEAUTH_FRAME_LEN);
3535         }
3536 
3537         sdata_unlock(sdata);
3538 }
3539 
3540 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3541 {
3542         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3543 
3544         sdata_lock(sdata);
3545         if (!ifmgd->associated) {
3546                 sdata_unlock(sdata);
3547                 return;
3548         }
3549 
3550         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3551                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3552                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3553                 ieee80211_sta_connection_lost(sdata,
3554                                               ifmgd->associated->bssid,
3555                                               WLAN_REASON_UNSPECIFIED,
3556                                               true);
3557                 sdata_unlock(sdata);
3558                 return;
3559         }
3560         sdata_unlock(sdata);
3561 }
3562 #endif
3563 
3564 /* interface setup */
3565 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3566 {
3567         struct ieee80211_if_managed *ifmgd;
3568 
3569         ifmgd = &sdata->u.mgd;
3570         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3571         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3572         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3573                   ieee80211_beacon_connection_loss_work);
3574         INIT_WORK(&ifmgd->csa_connection_drop_work,
3575                   ieee80211_csa_connection_drop_work);
3576         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3577         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3578                     (unsigned long) sdata);
3579         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3580                     (unsigned long) sdata);
3581         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3582                     (unsigned long) sdata);
3583         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3584                     (unsigned long) sdata);
3585 
3586         ifmgd->flags = 0;
3587         ifmgd->powersave = sdata->wdev.ps;
3588         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3589         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3590         ifmgd->p2p_noa_index = -1;
3591 
3592         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3593                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3594         else
3595                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3596 }
3597 
3598 /* scan finished notification */
3599 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3600 {
3601         struct ieee80211_sub_if_data *sdata;
3602 
3603         /* Restart STA timers */
3604         rcu_read_lock();
3605         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3606                 if (ieee80211_sdata_running(sdata))
3607                         ieee80211_restart_sta_timer(sdata);
3608         }
3609         rcu_read_unlock();
3610 }
3611 
3612 int ieee80211_max_network_latency(struct notifier_block *nb,
3613                                   unsigned long data, void *dummy)
3614 {
3615         s32 latency_usec = (s32) data;
3616         struct ieee80211_local *local =
3617                 container_of(nb, struct ieee80211_local,
3618                              network_latency_notifier);
3619 
3620         mutex_lock(&local->iflist_mtx);
3621         ieee80211_recalc_ps(local, latency_usec);
3622         mutex_unlock(&local->iflist_mtx);
3623 
3624         return 0;
3625 }
3626 
3627 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3628                                      struct cfg80211_bss *cbss)
3629 {
3630         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3631         const u8 *ht_cap_ie, *vht_cap_ie;
3632         const struct ieee80211_ht_cap *ht_cap;
3633         const struct ieee80211_vht_cap *vht_cap;
3634         u8 chains = 1;
3635 
3636         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3637                 return chains;
3638 
3639         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3640         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3641                 ht_cap = (void *)(ht_cap_ie + 2);
3642                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3643                 /*
3644                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3645                  *       "Tx Unequal Modulation Supported" fields.
3646                  */
3647         }
3648 
3649         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3650                 return chains;
3651 
3652         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3653         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3654                 u8 nss;
3655                 u16 tx_mcs_map;
3656 
3657                 vht_cap = (void *)(vht_cap_ie + 2);
3658                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3659                 for (nss = 8; nss > 0; nss--) {
3660                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3661                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3662                                 break;
3663                 }
3664                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3665                 chains = max(chains, nss);
3666         }
3667 
3668         return chains;
3669 }
3670 
3671 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3672                                   struct cfg80211_bss *cbss)
3673 {
3674         struct ieee80211_local *local = sdata->local;
3675         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3676         const struct ieee80211_ht_operation *ht_oper = NULL;
3677         const struct ieee80211_vht_operation *vht_oper = NULL;
3678         struct ieee80211_supported_band *sband;
3679         struct cfg80211_chan_def chandef;
3680         int ret;
3681 
3682         sband = local->hw.wiphy->bands[cbss->channel->band];
3683 
3684         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3685                           IEEE80211_STA_DISABLE_80P80MHZ |
3686                           IEEE80211_STA_DISABLE_160MHZ);
3687 
3688         rcu_read_lock();
3689 
3690         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3691             sband->ht_cap.ht_supported) {
3692                 const u8 *ht_oper_ie, *ht_cap;
3693 
3694                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3695                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3696                         ht_oper = (void *)(ht_oper_ie + 2);
3697 
3698                 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3699                 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3700                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3701                         ht_oper = NULL;
3702                 }
3703         }
3704 
3705         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3706             sband->vht_cap.vht_supported) {
3707                 const u8 *vht_oper_ie, *vht_cap;
3708 
3709                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3710                                                    WLAN_EID_VHT_OPERATION);
3711                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3712                         vht_oper = (void *)(vht_oper_ie + 2);
3713                 if (vht_oper && !ht_oper) {
3714                         vht_oper = NULL;
3715                         sdata_info(sdata,
3716                                    "AP advertised VHT without HT, disabling both\n");
3717                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3718                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3719                 }
3720 
3721                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3722                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3723                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3724                         vht_oper = NULL;
3725                 }
3726         }
3727 
3728         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3729                                                      cbss->channel,
3730                                                      ht_oper, vht_oper,
3731                                                      &chandef, false);
3732 
3733         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3734                                       local->rx_chains);
3735 
3736         rcu_read_unlock();
3737 
3738         /* will change later if needed */
3739         sdata->smps_mode = IEEE80211_SMPS_OFF;
3740 
3741         mutex_lock(&local->mtx);
3742         /*
3743          * If this fails (possibly due to channel context sharing
3744          * on incompatible channels, e.g. 80+80 and 160 sharing the
3745          * same control channel) try to use a smaller bandwidth.
3746          */
3747         ret = ieee80211_vif_use_channel(sdata, &chandef,
3748                                         IEEE80211_CHANCTX_SHARED);
3749 
3750         /* don't downgrade for 5 and 10 MHz channels, though. */
3751         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3752             chandef.width == NL80211_CHAN_WIDTH_10)
3753                 goto out;
3754 
3755         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3756                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3757                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3758                                                 IEEE80211_CHANCTX_SHARED);
3759         }
3760  out:
3761         mutex_unlock(&local->mtx);
3762         return ret;
3763 }
3764 
3765 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3766                                      struct cfg80211_bss *cbss, bool assoc)
3767 {
3768         struct ieee80211_local *local = sdata->local;
3769         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3770         struct ieee80211_bss *bss = (void *)cbss->priv;
3771         struct sta_info *new_sta = NULL;
3772         bool have_sta = false;
3773         int err;
3774 
3775         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3776                 return -EINVAL;
3777 
3778         if (assoc) {
3779                 rcu_read_lock();
3780                 have_sta = sta_info_get(sdata, cbss->bssid);
3781                 rcu_read_unlock();
3782         }
3783 
3784         if (!have_sta) {
3785                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3786                 if (!new_sta)
3787                         return -ENOMEM;
3788         }
3789         if (new_sta) {
3790                 u32 rates = 0, basic_rates = 0;
3791                 bool have_higher_than_11mbit;
3792                 int min_rate = INT_MAX, min_rate_index = -1;
3793                 struct ieee80211_chanctx_conf *chanctx_conf;
3794                 struct ieee80211_supported_band *sband;
3795                 const struct cfg80211_bss_ies *ies;
3796                 int shift;
3797                 u32 rate_flags;
3798 
3799                 sband = local->hw.wiphy->bands[cbss->channel->band];
3800 
3801                 err = ieee80211_prep_channel(sdata, cbss);
3802                 if (err) {
3803                         sta_info_free(local, new_sta);
3804                         return -EINVAL;
3805                 }
3806                 shift = ieee80211_vif_get_shift(&sdata->vif);
3807 
3808                 rcu_read_lock();
3809                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3810                 if (WARN_ON(!chanctx_conf)) {
3811                         rcu_read_unlock();
3812                         sta_info_free(local, new_sta);
3813                         return -EINVAL;
3814                 }
3815                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
3816                 rcu_read_unlock();
3817 
3818                 ieee80211_get_rates(sband, bss->supp_rates,
3819                                     bss->supp_rates_len,
3820                                     &rates, &basic_rates,
3821                                     &have_higher_than_11mbit,
3822                                     &min_rate, &min_rate_index,
3823                                     shift, rate_flags);
3824 
3825                 /*
3826                  * This used to be a workaround for basic rates missing
3827                  * in the association response frame. Now that we no
3828                  * longer use the basic rates from there, it probably
3829                  * doesn't happen any more, but keep the workaround so
3830                  * in case some *other* APs are buggy in different ways
3831                  * we can connect -- with a warning.
3832                  */
3833                 if (!basic_rates && min_rate_index >= 0) {
3834                         sdata_info(sdata,
3835                                    "No basic rates, using min rate instead\n");
3836                         basic_rates = BIT(min_rate_index);
3837                 }
3838 
3839                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3840                 sdata->vif.bss_conf.basic_rates = basic_rates;
3841 
3842                 /* cf. IEEE 802.11 9.2.12 */
3843                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3844                     have_higher_than_11mbit)
3845                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3846                 else
3847                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3848 
3849                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3850 
3851                 /* set timing information */
3852                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3853                 rcu_read_lock();
3854                 ies = rcu_dereference(cbss->beacon_ies);
3855                 if (ies) {
3856                         const u8 *tim_ie;
3857 
3858                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3859                         sdata->vif.bss_conf.sync_device_ts =
3860                                 bss->device_ts_beacon;
3861                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3862                                                   ies->data, ies->len);
3863                         if (tim_ie && tim_ie[1] >= 2)
3864                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3865                         else
3866                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3867                 } else if (!(local->hw.flags &
3868                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
3869                         ies = rcu_dereference(cbss->proberesp_ies);
3870                         /* must be non-NULL since beacon IEs were NULL */
3871                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3872                         sdata->vif.bss_conf.sync_device_ts =
3873                                 bss->device_ts_presp;
3874                         sdata->vif.bss_conf.sync_dtim_count = 0;
3875                 } else {
3876                         sdata->vif.bss_conf.sync_tsf = 0;
3877                         sdata->vif.bss_conf.sync_device_ts = 0;
3878                         sdata->vif.bss_conf.sync_dtim_count = 0;
3879                 }
3880                 rcu_read_unlock();
3881 
3882                 /* tell driver about BSSID, basic rates and timing */
3883                 ieee80211_bss_info_change_notify(sdata,
3884                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3885                         BSS_CHANGED_BEACON_INT);
3886 
3887                 if (assoc)
3888                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3889 
3890                 err = sta_info_insert(new_sta);
3891                 new_sta = NULL;
3892                 if (err) {
3893                         sdata_info(sdata,
3894                                    "failed to insert STA entry for the AP (error %d)\n",
3895                                    err);
3896                         return err;
3897                 }
3898         } else
3899                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3900 
3901         return 0;
3902 }
3903 
3904 /* config hooks */
3905 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3906                        struct cfg80211_auth_request *req)
3907 {
3908         struct ieee80211_local *local = sdata->local;
3909         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3910         struct ieee80211_mgd_auth_data *auth_data;
3911         u16 auth_alg;
3912         int err;
3913 
3914         /* prepare auth data structure */
3915 
3916         switch (req->auth_type) {
3917         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3918                 auth_alg = WLAN_AUTH_OPEN;
3919                 break;
3920         case NL80211_AUTHTYPE_SHARED_KEY:
3921                 if (IS_ERR(local->wep_tx_tfm))
3922                         return -EOPNOTSUPP;
3923                 auth_alg = WLAN_AUTH_SHARED_KEY;
3924                 break;
3925         case NL80211_AUTHTYPE_FT:
3926                 auth_alg = WLAN_AUTH_FT;
3927                 break;
3928         case NL80211_AUTHTYPE_NETWORK_EAP:
3929                 auth_alg = WLAN_AUTH_LEAP;
3930                 break;
3931         case NL80211_AUTHTYPE_SAE:
3932                 auth_alg = WLAN_AUTH_SAE;
3933                 break;
3934         default:
3935                 return -EOPNOTSUPP;
3936         }
3937 
3938         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3939                             req->ie_len, GFP_KERNEL);
3940         if (!auth_data)
3941                 return -ENOMEM;
3942 
3943         auth_data->bss = req->bss;
3944 
3945         if (req->sae_data_len >= 4) {
3946                 __le16 *pos = (__le16 *) req->sae_data;
3947                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3948                 auth_data->sae_status = le16_to_cpu(pos[1]);
3949                 memcpy(auth_data->data, req->sae_data + 4,
3950                        req->sae_data_len - 4);
3951                 auth_data->data_len += req->sae_data_len - 4;
3952         }
3953 
3954         if (req->ie && req->ie_len) {
3955                 memcpy(&auth_data->data[auth_data->data_len],
3956                        req->ie, req->ie_len);
3957                 auth_data->data_len += req->ie_len;
3958         }
3959 
3960         if (req->key && req->key_len) {
3961                 auth_data->key_len = req->key_len;
3962                 auth_data->key_idx = req->key_idx;
3963                 memcpy(auth_data->key, req->key, req->key_len);
3964         }
3965 
3966         auth_data->algorithm = auth_alg;
3967 
3968         /* try to authenticate/probe */
3969 
3970         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3971             ifmgd->assoc_data) {
3972                 err = -EBUSY;
3973                 goto err_free;
3974         }
3975 
3976         if (ifmgd->auth_data)
3977                 ieee80211_destroy_auth_data(sdata, false);
3978 
3979         /* prep auth_data so we don't go into idle on disassoc */
3980         ifmgd->auth_data = auth_data;
3981 
3982         if (ifmgd->associated) {
3983                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3984 
3985                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3986                                        WLAN_REASON_UNSPECIFIED,
3987                                        false, frame_buf);
3988 
3989                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3990                                       sizeof(frame_buf));
3991         }
3992 
3993         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3994 
3995         err = ieee80211_prep_connection(sdata, req->bss, false);
3996         if (err)
3997                 goto err_clear;
3998 
3999         err = ieee80211_probe_auth(sdata);
4000         if (err) {
4001                 sta_info_destroy_addr(sdata, req->bss->bssid);
4002                 goto err_clear;
4003         }
4004 
4005         /* hold our own reference */
4006         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4007         return 0;
4008 
4009  err_clear:
4010         memset(ifmgd->bssid, 0, ETH_ALEN);
4011         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4012         ifmgd->auth_data = NULL;
4013  err_free:
4014         kfree(auth_data);
4015         return err;
4016 }
4017 
4018 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4019                                         const u8 *wmm_param, int len)
4020 {
4021         const u8 *pos;
4022         size_t left;
4023 
4024         if (len < 8)
4025                 return false;
4026 
4027         if (wmm_param[5] != 1 /* version */)
4028                 return false;
4029 
4030         pos = wmm_param + 8;
4031         left = len - 8;
4032 
4033         for (; left >= 4; left -= 4, pos += 4) {
4034                 u8 aifsn = pos[0] & 0x0f;
4035                 u8 ecwmin = pos[1] & 0x0f;
4036                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4037                 int aci = (pos[0] >> 5) & 0x03;
4038 
4039                 if (aifsn < 2) {
4040                         sdata_info(sdata,
4041                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4042                                    aifsn, aci);
4043                         return false;
4044                 }
4045                 if (ecwmin > ecwmax) {
4046                         sdata_info(sdata,
4047                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4048                                    ecwmin, ecwmax, aci);
4049                         return false;
4050                 }
4051         }
4052 
4053         return true;
4054 }
4055 
4056 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4057                         struct cfg80211_assoc_request *req)
4058 {
4059         struct ieee80211_local *local = sdata->local;
4060         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4061         struct ieee80211_bss *bss = (void *)req->bss->priv;
4062         struct ieee80211_mgd_assoc_data *assoc_data;
4063         const struct cfg80211_bss_ies *beacon_ies;
4064         struct ieee80211_supported_band *sband;
4065         const u8 *ssidie, *ht_ie, *vht_ie;
4066         int i, err;
4067 
4068         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4069         if (!assoc_data)
4070                 return -ENOMEM;
4071 
4072         rcu_read_lock();
4073         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4074         if (!ssidie) {
4075                 rcu_read_unlock();
4076                 kfree(assoc_data);
4077                 return -EINVAL;
4078         }
4079         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4080         assoc_data->ssid_len = ssidie[1];
4081         rcu_read_unlock();
4082 
4083         if (ifmgd->associated) {
4084                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4085 
4086                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4087                                        WLAN_REASON_UNSPECIFIED,
4088                                        false, frame_buf);
4089 
4090                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4091                                       sizeof(frame_buf));
4092         }
4093 
4094         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4095                 err = -EBUSY;
4096                 goto err_free;
4097         }
4098 
4099         if (ifmgd->assoc_data) {
4100                 err = -EBUSY;
4101                 goto err_free;
4102         }
4103 
4104         if (ifmgd->auth_data) {
4105                 bool match;
4106 
4107                 /* keep sta info, bssid if matching */
4108                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4109                 ieee80211_destroy_auth_data(sdata, match);
4110         }
4111 
4112         /* prepare assoc data */
4113 
4114         ifmgd->beacon_crc_valid = false;
4115 
4116         assoc_data->wmm = bss->wmm_used &&
4117                           (local->hw.queues >= IEEE80211_NUM_ACS);
4118         if (assoc_data->wmm) {
4119                 /* try to check validity of WMM params IE */
4120                 const struct cfg80211_bss_ies *ies;
4121                 const u8 *wp, *start, *end;
4122 
4123                 rcu_read_lock();
4124                 ies = rcu_dereference(req->bss->ies);
4125                 start = ies->data;
4126                 end = start + ies->len;
4127 
4128                 while (true) {
4129                         wp = cfg80211_find_vendor_ie(
4130                                 WLAN_OUI_MICROSOFT,
4131                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4132                                 start, end - start);
4133                         if (!wp)
4134                                 break;
4135                         start = wp + wp[1] + 2;
4136                         /* if this IE is too short, try the next */
4137                         if (wp[1] <= 4)
4138                                 continue;
4139                         /* if this IE is WMM params, we found what we wanted */
4140                         if (wp[6] == 1)
4141                                 break;
4142                 }
4143 
4144                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4145                                                         wp[1] - 2)) {
4146                         assoc_data->wmm = false;
4147                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4148                 }
4149                 rcu_read_unlock();
4150         }
4151 
4152         /*
4153          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4154          * We still associate in non-HT mode (11a/b/g) if any one of these
4155          * ciphers is configured as pairwise.
4156          * We can set this to true for non-11n hardware, that'll be checked
4157          * separately along with the peer capabilities.
4158          */
4159         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4160                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4161                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4162                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4163                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4164                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4165                         netdev_info(sdata->dev,
4166                                     "disabling HT/VHT due to WEP/TKIP use\n");
4167                 }
4168         }
4169 
4170         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4171                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4172                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4173         }
4174 
4175         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4176                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4177 
4178         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4179         sband = local->hw.wiphy->bands[req->bss->channel->band];
4180         if (!sband->ht_cap.ht_supported ||
4181             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4182             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4183                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4184                 if (!bss->wmm_used &&
4185                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4186                         netdev_info(sdata->dev,
4187                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4188         }
4189 
4190         /* disable VHT if we don't support it or the AP doesn't use WMM */
4191         if (!sband->vht_cap.vht_supported ||
4192             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4193             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4194                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4195                 if (!bss->wmm_used &&
4196                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4197                         netdev_info(sdata->dev,
4198                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4199         }
4200 
4201         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4202         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4203                sizeof(ifmgd->ht_capa_mask));
4204 
4205         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4206         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4207                sizeof(ifmgd->vht_capa_mask));
4208 
4209         if (req->ie && req->ie_len) {
4210                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4211                 assoc_data->ie_len = req->ie_len;
4212         }
4213 
4214         assoc_data->bss = req->bss;
4215 
4216         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4217                 if (ifmgd->powersave)
4218                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4219                 else
4220                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4221         } else
4222                 sdata->smps_mode = ifmgd->req_smps;
4223 
4224         assoc_data->capability = req->bss->capability;
4225         assoc_data->supp_rates = bss->supp_rates;
4226         assoc_data->supp_rates_len = bss->supp_rates_len;
4227 
4228         rcu_read_lock();
4229         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4230         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4231                 assoc_data->ap_ht_param =
4232                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4233         else
4234                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4235         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4236         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4237                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4238                        sizeof(struct ieee80211_vht_cap));
4239         else
4240                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4241         rcu_read_unlock();
4242 
4243         if (bss->wmm_used && bss->uapsd_supported &&
4244             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4245                 assoc_data->uapsd = true;
4246                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4247         } else {
4248                 assoc_data->uapsd = false;
4249                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4250         }
4251 
4252         if (req->prev_bssid)
4253                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4254 
4255         if (req->use_mfp) {
4256                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4257                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4258         } else {
4259                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4260                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4261         }
4262 
4263         if (req->crypto.control_port)
4264                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4265         else
4266                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4267 
4268         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4269         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4270         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4271                                                         sdata->vif.type);
4272 
4273         /* kick off associate process */
4274 
4275         ifmgd->assoc_data = assoc_data;
4276         ifmgd->dtim_period = 0;
4277         ifmgd->have_beacon = false;
4278 
4279         err = ieee80211_prep_connection(sdata, req->bss, true);
4280         if (err)
4281                 goto err_clear;
4282 
4283         rcu_read_lock();
4284         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4285 
4286         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4287             !beacon_ies) {
4288                 /*
4289                  * Wait up to one beacon interval ...
4290                  * should this be more if we miss one?
4291                  */
4292                 sdata_info(sdata, "waiting for beacon from %pM\n",
4293                            ifmgd->bssid);
4294                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4295                 assoc_data->timeout_started = true;
4296                 assoc_data->need_beacon = true;
4297         } else if (beacon_ies) {
4298                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4299                                                     beacon_ies->data,
4300                                                     beacon_ies->len);
4301                 u8 dtim_count = 0;
4302 
4303                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4304                         const struct ieee80211_tim_ie *tim;
4305                         tim = (void *)(tim_ie + 2);
4306                         ifmgd->dtim_period = tim->dtim_period;
4307                         dtim_count = tim->dtim_count;
4308                 }
4309                 ifmgd->have_beacon = true;
4310                 assoc_data->timeout = jiffies;
4311                 assoc_data->timeout_started = true;
4312 
4313                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4314                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4315                         sdata->vif.bss_conf.sync_device_ts =
4316                                 bss->device_ts_beacon;
4317                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4318                 }
4319         } else {
4320                 assoc_data->timeout = jiffies;
4321                 assoc_data->timeout_started = true;
4322         }
4323         rcu_read_unlock();
4324 
4325         run_again(sdata, assoc_data->timeout);
4326 
4327         if (bss->corrupt_data) {
4328                 char *corrupt_type = "data";
4329                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4330                         if (bss->corrupt_data &
4331                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4332                                 corrupt_type = "beacon and probe response";
4333                         else
4334                                 corrupt_type = "beacon";
4335                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4336                         corrupt_type = "probe response";
4337                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4338                            corrupt_type);
4339         }
4340 
4341         return 0;
4342  err_clear:
4343         memset(ifmgd->bssid, 0, ETH_ALEN);
4344         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4345         ifmgd->assoc_data = NULL;
4346  err_free:
4347         kfree(assoc_data);
4348         return err;
4349 }
4350 
4351 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4352                          struct cfg80211_deauth_request *req)
4353 {
4354         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4355         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4356         bool tx = !req->local_state_change;
4357         bool report_frame = false;
4358 
4359         sdata_info(sdata,
4360                    "deauthenticating from %pM by local choice (reason=%d)\n",
4361                    req->bssid, req->reason_code);
4362 
4363         if (ifmgd->auth_data) {
4364                 drv_mgd_prepare_tx(sdata->local, sdata);
4365                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4366                                                IEEE80211_STYPE_DEAUTH,
4367                                                req->reason_code, tx,
4368                                                frame_buf);
4369                 ieee80211_destroy_auth_data(sdata, false);
4370 
4371                 report_frame = true;
4372                 goto out;
4373         }
4374 
4375         if (ifmgd->associated &&
4376             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4377                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4378                                        req->reason_code, tx, frame_buf);
4379                 report_frame = true;
4380         }
4381 
4382  out:
4383         if (report_frame)
4384                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4385                                       IEEE80211_DEAUTH_FRAME_LEN);
4386 
4387         return 0;
4388 }
4389 
4390 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4391                            struct cfg80211_disassoc_request *req)
4392 {
4393         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4394         u8 bssid[ETH_ALEN];
4395         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4396 
4397         /*
4398          * cfg80211 should catch this ... but it's racy since
4399          * we can receive a disassoc frame, process it, hand it
4400          * to cfg80211 while that's in a locked section already
4401          * trying to tell us that the user wants to disconnect.
4402          */
4403         if (ifmgd->associated != req->bss)
4404                 return -ENOLINK;
4405 
4406         sdata_info(sdata,
4407                    "disassociating from %pM by local choice (reason=%d)\n",
4408                    req->bss->bssid, req->reason_code);
4409 
4410         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4411         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4412                                req->reason_code, !req->local_state_change,
4413                                frame_buf);
4414 
4415         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4416                               IEEE80211_DEAUTH_FRAME_LEN);
4417 
4418         return 0;
4419 }
4420 
4421 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4422 {
4423         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4424 
4425         /*
4426          * Make sure some work items will not run after this,
4427          * they will not do anything but might not have been
4428          * cancelled when disconnecting.
4429          */
4430         cancel_work_sync(&ifmgd->monitor_work);
4431         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4432         cancel_work_sync(&ifmgd->request_smps_work);
4433         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4434         cancel_work_sync(&ifmgd->chswitch_work);
4435 
4436         sdata_lock(sdata);
4437         if (ifmgd->assoc_data) {
4438                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4439                 ieee80211_destroy_assoc_data(sdata, false);
4440                 cfg80211_assoc_timeout(sdata->dev, bss);
4441         }
4442         if (ifmgd->auth_data)
4443                 ieee80211_destroy_auth_data(sdata, false);
4444         del_timer_sync(&ifmgd->timer);
4445         sdata_unlock(sdata);
4446 }
4447 
4448 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4449                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4450                                gfp_t gfp)
4451 {
4452         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4453 
4454         trace_api_cqm_rssi_notify(sdata, rssi_event);
4455 
4456         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4457 }
4458 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
4459 

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