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mac80211/cfg80211: update bss channel on channel switch
[linux.git] / net / mac80211 / mlme.c
1 /*
2  * BSS client mode implementation
3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4  * Copyright 2004, Instant802 Networks, Inc.
5  * Copyright 2005, Devicescape Software, Inc.
6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8  * Copyright 2013-2014  Intel Mobile Communications GmbH
9  * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
10  * Copyright (C) 2018 - 2019 Intel Corporation
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License version 2 as
14  * published by the Free Software Foundation.
15  */
16
17 #include <linux/delay.h>
18 #include <linux/if_ether.h>
19 #include <linux/skbuff.h>
20 #include <linux/if_arp.h>
21 #include <linux/etherdevice.h>
22 #include <linux/moduleparam.h>
23 #include <linux/rtnetlink.h>
24 #include <linux/crc32.h>
25 #include <linux/slab.h>
26 #include <linux/export.h>
27 #include <net/mac80211.h>
28 #include <asm/unaligned.h>
29
30 #include "ieee80211_i.h"
31 #include "driver-ops.h"
32 #include "rate.h"
33 #include "led.h"
34 #include "fils_aead.h"
35
36 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
37 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
38 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
39 #define IEEE80211_AUTH_TIMEOUT_SAE      (HZ * 2)
40 #define IEEE80211_AUTH_MAX_TRIES        3
41 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
42 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
43 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
44 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
45 #define IEEE80211_ASSOC_MAX_TRIES       3
46
47 static int max_nullfunc_tries = 2;
48 module_param(max_nullfunc_tries, int, 0644);
49 MODULE_PARM_DESC(max_nullfunc_tries,
50                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
51
52 static int max_probe_tries = 5;
53 module_param(max_probe_tries, int, 0644);
54 MODULE_PARM_DESC(max_probe_tries,
55                  "Maximum probe tries before disconnecting (reason 4).");
56
57 /*
58  * Beacon loss timeout is calculated as N frames times the
59  * advertised beacon interval.  This may need to be somewhat
60  * higher than what hardware might detect to account for
61  * delays in the host processing frames. But since we also
62  * probe on beacon miss before declaring the connection lost
63  * default to what we want.
64  */
65 static int beacon_loss_count = 7;
66 module_param(beacon_loss_count, int, 0644);
67 MODULE_PARM_DESC(beacon_loss_count,
68                  "Number of beacon intervals before we decide beacon was lost.");
69
70 /*
71  * Time the connection can be idle before we probe
72  * it to see if we can still talk to the AP.
73  */
74 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
75 /*
76  * Time we wait for a probe response after sending
77  * a probe request because of beacon loss or for
78  * checking the connection still works.
79  */
80 static int probe_wait_ms = 500;
81 module_param(probe_wait_ms, int, 0644);
82 MODULE_PARM_DESC(probe_wait_ms,
83                  "Maximum time(ms) to wait for probe response"
84                  " before disconnecting (reason 4).");
85
86 /*
87  * How many Beacon frames need to have been used in average signal strength
88  * before starting to indicate signal change events.
89  */
90 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
91
92 /*
93  * We can have multiple work items (and connection probing)
94  * scheduling this timer, but we need to take care to only
95  * reschedule it when it should fire _earlier_ than it was
96  * asked for before, or if it's not pending right now. This
97  * function ensures that. Note that it then is required to
98  * run this function for all timeouts after the first one
99  * has happened -- the work that runs from this timer will
100  * do that.
101  */
102 static void run_again(struct ieee80211_sub_if_data *sdata,
103                       unsigned long timeout)
104 {
105         sdata_assert_lock(sdata);
106
107         if (!timer_pending(&sdata->u.mgd.timer) ||
108             time_before(timeout, sdata->u.mgd.timer.expires))
109                 mod_timer(&sdata->u.mgd.timer, timeout);
110 }
111
112 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
113 {
114         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
115                 return;
116
117         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
118                 return;
119
120         mod_timer(&sdata->u.mgd.bcn_mon_timer,
121                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
122 }
123
124 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
125 {
126         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
127
128         if (unlikely(!ifmgd->associated))
129                 return;
130
131         if (ifmgd->probe_send_count)
132                 ifmgd->probe_send_count = 0;
133
134         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
135                 return;
136
137         mod_timer(&ifmgd->conn_mon_timer,
138                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
139 }
140
141 static int ecw2cw(int ecw)
142 {
143         return (1 << ecw) - 1;
144 }
145
146 static u32
147 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
148                              struct ieee80211_supported_band *sband,
149                              struct ieee80211_channel *channel,
150                              const struct ieee80211_ht_operation *ht_oper,
151                              const struct ieee80211_vht_operation *vht_oper,
152                              const struct ieee80211_he_operation *he_oper,
153                              struct cfg80211_chan_def *chandef, bool tracking)
154 {
155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
156         struct cfg80211_chan_def vht_chandef;
157         struct ieee80211_sta_ht_cap sta_ht_cap;
158         u32 ht_cfreq, ret;
159
160         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
161         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
162
163         chandef->chan = channel;
164         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
165         chandef->center_freq1 = channel->center_freq;
166         chandef->center_freq2 = 0;
167
168         if (!ht_oper || !sta_ht_cap.ht_supported) {
169                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
170                 goto out;
171         }
172
173         chandef->width = NL80211_CHAN_WIDTH_20;
174
175         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
176                                                   channel->band);
177         /* check that channel matches the right operating channel */
178         if (!tracking && channel->center_freq != ht_cfreq) {
179                 /*
180                  * It's possible that some APs are confused here;
181                  * Netgear WNDR3700 sometimes reports 4 higher than
182                  * the actual channel in association responses, but
183                  * since we look at probe response/beacon data here
184                  * it should be OK.
185                  */
186                 sdata_info(sdata,
187                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
188                            channel->center_freq, ht_cfreq,
189                            ht_oper->primary_chan, channel->band);
190                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
191                 goto out;
192         }
193
194         /* check 40 MHz support, if we have it */
195         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
196                 ieee80211_chandef_ht_oper(ht_oper, chandef);
197         } else {
198                 /* 40 MHz (and 80 MHz) must be supported for VHT */
199                 ret = IEEE80211_STA_DISABLE_VHT;
200                 /* also mark 40 MHz disabled */
201                 ret |= IEEE80211_STA_DISABLE_40MHZ;
202                 goto out;
203         }
204
205         if (!vht_oper || !sband->vht_cap.vht_supported) {
206                 ret = IEEE80211_STA_DISABLE_VHT;
207                 goto out;
208         }
209
210         vht_chandef = *chandef;
211         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE) && he_oper &&
212             (le32_to_cpu(he_oper->he_oper_params) &
213              IEEE80211_HE_OPERATION_VHT_OPER_INFO)) {
214                 struct ieee80211_vht_operation he_oper_vht_cap;
215
216                 /*
217                  * Set only first 3 bytes (other 2 aren't used in
218                  * ieee80211_chandef_vht_oper() anyway)
219                  */
220                 memcpy(&he_oper_vht_cap, he_oper->optional, 3);
221                 he_oper_vht_cap.basic_mcs_set = cpu_to_le16(0);
222
223                 if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
224                                                 &he_oper_vht_cap, ht_oper,
225                                                 &vht_chandef)) {
226                         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
227                                 sdata_info(sdata,
228                                            "HE AP VHT information is invalid, disable HE\n");
229                         ret = IEEE80211_STA_DISABLE_HE;
230                         goto out;
231                 }
232         } else if (!ieee80211_chandef_vht_oper(&sdata->local->hw, vht_oper,
233                                                ht_oper, &vht_chandef)) {
234                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
235                         sdata_info(sdata,
236                                    "AP VHT information is invalid, disable VHT\n");
237                 ret = IEEE80211_STA_DISABLE_VHT;
238                 goto out;
239         }
240
241         if (!cfg80211_chandef_valid(&vht_chandef)) {
242                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
243                         sdata_info(sdata,
244                                    "AP VHT information is invalid, disable VHT\n");
245                 ret = IEEE80211_STA_DISABLE_VHT;
246                 goto out;
247         }
248
249         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
250                 ret = 0;
251                 goto out;
252         }
253
254         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
255                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
256                         sdata_info(sdata,
257                                    "AP VHT information doesn't match HT, disable VHT\n");
258                 ret = IEEE80211_STA_DISABLE_VHT;
259                 goto out;
260         }
261
262         *chandef = vht_chandef;
263
264         ret = 0;
265
266 out:
267         /*
268          * When tracking the current AP, don't do any further checks if the
269          * new chandef is identical to the one we're currently using for the
270          * connection. This keeps us from playing ping-pong with regulatory,
271          * without it the following can happen (for example):
272          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
273          *  - AP advertises regdom US
274          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
275          *  - the code below detects an unsupported channel, downgrades, and
276          *    we disconnect from the AP in the caller
277          *  - disconnect causes CRDA to reload world regdomain and the game
278          *    starts anew.
279          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
280          *
281          * It seems possible that there are still scenarios with CSA or real
282          * bandwidth changes where a this could happen, but those cases are
283          * less common and wouldn't completely prevent using the AP.
284          */
285         if (tracking &&
286             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
287                 return ret;
288
289         /* don't print the message below for VHT mismatch if VHT is disabled */
290         if (ret & IEEE80211_STA_DISABLE_VHT)
291                 vht_chandef = *chandef;
292
293         /*
294          * Ignore the DISABLED flag when we're already connected and only
295          * tracking the APs beacon for bandwidth changes - otherwise we
296          * might get disconnected here if we connect to an AP, update our
297          * regulatory information based on the AP's country IE and the
298          * information we have is wrong/outdated and disables the channel
299          * that we're actually using for the connection to the AP.
300          */
301         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
302                                         tracking ? 0 :
303                                                    IEEE80211_CHAN_DISABLED)) {
304                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
305                         ret = IEEE80211_STA_DISABLE_HT |
306                               IEEE80211_STA_DISABLE_VHT;
307                         break;
308                 }
309
310                 ret |= ieee80211_chandef_downgrade(chandef);
311         }
312
313         if (chandef->width != vht_chandef.width && !tracking)
314                 sdata_info(sdata,
315                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
316
317         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
318         return ret;
319 }
320
321 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
322                                struct sta_info *sta,
323                                const struct ieee80211_ht_cap *ht_cap,
324                                const struct ieee80211_ht_operation *ht_oper,
325                                const struct ieee80211_vht_operation *vht_oper,
326                                const struct ieee80211_he_operation *he_oper,
327                                const u8 *bssid, u32 *changed)
328 {
329         struct ieee80211_local *local = sdata->local;
330         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
331         struct ieee80211_channel *chan = sdata->vif.bss_conf.chandef.chan;
332         struct ieee80211_supported_band *sband =
333                 local->hw.wiphy->bands[chan->band];
334         struct cfg80211_chan_def chandef;
335         u16 ht_opmode;
336         u32 flags;
337         enum ieee80211_sta_rx_bandwidth new_sta_bw;
338         int ret;
339
340         /* if HT was/is disabled, don't track any bandwidth changes */
341         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
342                 return 0;
343
344         /* don't check VHT if we associated as non-VHT station */
345         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
346                 vht_oper = NULL;
347
348         /* don't check HE if we associated as non-HE station */
349         if (ifmgd->flags & IEEE80211_STA_DISABLE_HE ||
350             !ieee80211_get_he_sta_cap(sband))
351                 he_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         /* calculate new channel (type) based on HT/VHT/HE operation IEs */
367         flags = ieee80211_determine_chantype(sdata, sband, chan,
368                                              ht_oper, vht_oper, he_oper,
369                                              &chandef, true);
370
371         /*
372          * Downgrade the new channel if we associated with restricted
373          * capabilities. For example, if we associated as a 20 MHz STA
374          * to a 40 MHz AP (due to regulatory, capabilities or config
375          * reasons) then switching to a 40 MHz channel now won't do us
376          * any good -- we couldn't use it with the AP.
377          */
378         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
379             chandef.width == NL80211_CHAN_WIDTH_80P80)
380                 flags |= ieee80211_chandef_downgrade(&chandef);
381         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
382             chandef.width == NL80211_CHAN_WIDTH_160)
383                 flags |= ieee80211_chandef_downgrade(&chandef);
384         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
385             chandef.width > NL80211_CHAN_WIDTH_20)
386                 flags |= ieee80211_chandef_downgrade(&chandef);
387
388         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
389                 return 0;
390
391         sdata_info(sdata,
392                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
393                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
394                    chandef.center_freq1, chandef.center_freq2);
395
396         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
397                                       IEEE80211_STA_DISABLE_VHT |
398                                       IEEE80211_STA_DISABLE_40MHZ |
399                                       IEEE80211_STA_DISABLE_80P80MHZ |
400                                       IEEE80211_STA_DISABLE_160MHZ)) ||
401             !cfg80211_chandef_valid(&chandef)) {
402                 sdata_info(sdata,
403                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
404                            ifmgd->bssid);
405                 return -EINVAL;
406         }
407
408         switch (chandef.width) {
409         case NL80211_CHAN_WIDTH_20_NOHT:
410         case NL80211_CHAN_WIDTH_20:
411                 new_sta_bw = IEEE80211_STA_RX_BW_20;
412                 break;
413         case NL80211_CHAN_WIDTH_40:
414                 new_sta_bw = IEEE80211_STA_RX_BW_40;
415                 break;
416         case NL80211_CHAN_WIDTH_80:
417                 new_sta_bw = IEEE80211_STA_RX_BW_80;
418                 break;
419         case NL80211_CHAN_WIDTH_80P80:
420         case NL80211_CHAN_WIDTH_160:
421                 new_sta_bw = IEEE80211_STA_RX_BW_160;
422                 break;
423         default:
424                 return -EINVAL;
425         }
426
427         if (new_sta_bw > sta->cur_max_bandwidth)
428                 new_sta_bw = sta->cur_max_bandwidth;
429
430         if (new_sta_bw < sta->sta.bandwidth) {
431                 sta->sta.bandwidth = new_sta_bw;
432                 rate_control_rate_update(local, sband, sta,
433                                          IEEE80211_RC_BW_CHANGED);
434         }
435
436         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
437         if (ret) {
438                 sdata_info(sdata,
439                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
440                            ifmgd->bssid);
441                 return ret;
442         }
443
444         if (new_sta_bw > sta->sta.bandwidth) {
445                 sta->sta.bandwidth = new_sta_bw;
446                 rate_control_rate_update(local, sband, sta,
447                                          IEEE80211_RC_BW_CHANGED);
448         }
449
450         return 0;
451 }
452
453 /* frame sending functions */
454
455 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
456                                 struct sk_buff *skb, u8 ap_ht_param,
457                                 struct ieee80211_supported_band *sband,
458                                 struct ieee80211_channel *channel,
459                                 enum ieee80211_smps_mode smps)
460 {
461         u8 *pos;
462         u32 flags = channel->flags;
463         u16 cap;
464         struct ieee80211_sta_ht_cap ht_cap;
465
466         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
467
468         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
469         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
470
471         /* determine capability flags */
472         cap = ht_cap.cap;
473
474         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
475         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
476                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
477                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
478                         cap &= ~IEEE80211_HT_CAP_SGI_40;
479                 }
480                 break;
481         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
482                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
483                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
484                         cap &= ~IEEE80211_HT_CAP_SGI_40;
485                 }
486                 break;
487         }
488
489         /*
490          * If 40 MHz was disabled associate as though we weren't
491          * capable of 40 MHz -- some broken APs will never fall
492          * back to trying to transmit in 20 MHz.
493          */
494         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
495                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
496                 cap &= ~IEEE80211_HT_CAP_SGI_40;
497         }
498
499         /* set SM PS mode properly */
500         cap &= ~IEEE80211_HT_CAP_SM_PS;
501         switch (smps) {
502         case IEEE80211_SMPS_AUTOMATIC:
503         case IEEE80211_SMPS_NUM_MODES:
504                 WARN_ON(1);
505                 /* fall through */
506         case IEEE80211_SMPS_OFF:
507                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
508                         IEEE80211_HT_CAP_SM_PS_SHIFT;
509                 break;
510         case IEEE80211_SMPS_STATIC:
511                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
512                         IEEE80211_HT_CAP_SM_PS_SHIFT;
513                 break;
514         case IEEE80211_SMPS_DYNAMIC:
515                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
516                         IEEE80211_HT_CAP_SM_PS_SHIFT;
517                 break;
518         }
519
520         /* reserve and fill IE */
521         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
522         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
523 }
524
525 /* This function determines vht capability flags for the association
526  * and builds the IE.
527  * Note - the function may set the owner of the MU-MIMO capability
528  */
529 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
530                                  struct sk_buff *skb,
531                                  struct ieee80211_supported_band *sband,
532                                  struct ieee80211_vht_cap *ap_vht_cap)
533 {
534         struct ieee80211_local *local = sdata->local;
535         u8 *pos;
536         u32 cap;
537         struct ieee80211_sta_vht_cap vht_cap;
538         u32 mask, ap_bf_sts, our_bf_sts;
539
540         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
541
542         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
543         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
544
545         /* determine capability flags */
546         cap = vht_cap.cap;
547
548         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
549                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
550
551                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
552                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
553                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
554                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
555         }
556
557         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
558                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
559                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
560         }
561
562         /*
563          * Some APs apparently get confused if our capabilities are better
564          * than theirs, so restrict what we advertise in the assoc request.
565          */
566         if (!(ap_vht_cap->vht_cap_info &
567                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
568                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
569                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
570         else if (!(ap_vht_cap->vht_cap_info &
571                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
572                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
573
574         /*
575          * If some other vif is using the MU-MIMO capablity we cannot associate
576          * using MU-MIMO - this will lead to contradictions in the group-id
577          * mechanism.
578          * Ownership is defined since association request, in order to avoid
579          * simultaneous associations with MU-MIMO.
580          */
581         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
582                 bool disable_mu_mimo = false;
583                 struct ieee80211_sub_if_data *other;
584
585                 list_for_each_entry_rcu(other, &local->interfaces, list) {
586                         if (other->vif.mu_mimo_owner) {
587                                 disable_mu_mimo = true;
588                                 break;
589                         }
590                 }
591                 if (disable_mu_mimo)
592                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
593                 else
594                         sdata->vif.mu_mimo_owner = true;
595         }
596
597         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
598
599         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
600         our_bf_sts = cap & mask;
601
602         if (ap_bf_sts < our_bf_sts) {
603                 cap &= ~mask;
604                 cap |= ap_bf_sts;
605         }
606
607         /* reserve and fill IE */
608         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
609         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
610 }
611
612 /* This function determines HE capability flags for the association
613  * and builds the IE.
614  */
615 static void ieee80211_add_he_ie(struct ieee80211_sub_if_data *sdata,
616                                 struct sk_buff *skb,
617                                 struct ieee80211_supported_band *sband)
618 {
619         u8 *pos;
620         const struct ieee80211_sta_he_cap *he_cap = NULL;
621         u8 he_cap_size;
622
623         he_cap = ieee80211_get_he_sta_cap(sband);
624         if (!he_cap)
625                 return;
626
627         /*
628          * TODO: the 1 added is because this temporarily is under the EXTENSION
629          * IE. Get rid of it when it moves.
630          */
631         he_cap_size =
632                 2 + 1 + sizeof(he_cap->he_cap_elem) +
633                 ieee80211_he_mcs_nss_size(&he_cap->he_cap_elem) +
634                 ieee80211_he_ppe_size(he_cap->ppe_thres[0],
635                                       he_cap->he_cap_elem.phy_cap_info);
636         pos = skb_put(skb, he_cap_size);
637         ieee80211_ie_build_he_cap(pos, he_cap, pos + he_cap_size);
638 }
639
640 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
641 {
642         struct ieee80211_local *local = sdata->local;
643         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
644         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
645         struct sk_buff *skb;
646         struct ieee80211_mgmt *mgmt;
647         u8 *pos, qos_info, *ie_start;
648         size_t offset = 0, noffset;
649         int i, count, rates_len, supp_rates_len, shift;
650         u16 capab;
651         struct ieee80211_supported_band *sband;
652         struct ieee80211_chanctx_conf *chanctx_conf;
653         struct ieee80211_channel *chan;
654         u32 rates = 0;
655
656         sdata_assert_lock(sdata);
657
658         rcu_read_lock();
659         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
660         if (WARN_ON(!chanctx_conf)) {
661                 rcu_read_unlock();
662                 return;
663         }
664         chan = chanctx_conf->def.chan;
665         rcu_read_unlock();
666         sband = local->hw.wiphy->bands[chan->band];
667         shift = ieee80211_vif_get_shift(&sdata->vif);
668
669         if (assoc_data->supp_rates_len) {
670                 /*
671                  * Get all rates supported by the device and the AP as
672                  * some APs don't like getting a superset of their rates
673                  * in the association request (e.g. D-Link DAP 1353 in
674                  * b-only mode)...
675                  */
676                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
677                                                      assoc_data->supp_rates,
678                                                      assoc_data->supp_rates_len,
679                                                      &rates);
680         } else {
681                 /*
682                  * In case AP not provide any supported rates information
683                  * before association, we send information element(s) with
684                  * all rates that we support.
685                  */
686                 rates_len = 0;
687                 for (i = 0; i < sband->n_bitrates; i++) {
688                         rates |= BIT(i);
689                         rates_len++;
690                 }
691         }
692
693         skb = alloc_skb(local->hw.extra_tx_headroom +
694                         sizeof(*mgmt) + /* bit too much but doesn't matter */
695                         2 + assoc_data->ssid_len + /* SSID */
696                         4 + rates_len + /* (extended) rates */
697                         4 + /* power capability */
698                         2 + 2 * sband->n_channels + /* supported channels */
699                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
700                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
701                         2 + 1 + sizeof(struct ieee80211_he_cap_elem) + /* HE */
702                                 sizeof(struct ieee80211_he_mcs_nss_supp) +
703                                 IEEE80211_HE_PPE_THRES_MAX_LEN +
704                         assoc_data->ie_len + /* extra IEs */
705                         (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
706                         9, /* WMM */
707                         GFP_KERNEL);
708         if (!skb)
709                 return;
710
711         skb_reserve(skb, local->hw.extra_tx_headroom);
712
713         capab = WLAN_CAPABILITY_ESS;
714
715         if (sband->band == NL80211_BAND_2GHZ) {
716                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
717                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
718         }
719
720         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
721                 capab |= WLAN_CAPABILITY_PRIVACY;
722
723         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
724             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
725                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
726
727         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
728                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
729
730         mgmt = skb_put_zero(skb, 24);
731         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
732         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
733         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
734
735         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
736                 skb_put(skb, 10);
737                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
738                                                   IEEE80211_STYPE_REASSOC_REQ);
739                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
740                 mgmt->u.reassoc_req.listen_interval =
741                                 cpu_to_le16(local->hw.conf.listen_interval);
742                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
743                        ETH_ALEN);
744         } else {
745                 skb_put(skb, 4);
746                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
747                                                   IEEE80211_STYPE_ASSOC_REQ);
748                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
749                 mgmt->u.assoc_req.listen_interval =
750                                 cpu_to_le16(local->hw.conf.listen_interval);
751         }
752
753         /* SSID */
754         pos = skb_put(skb, 2 + assoc_data->ssid_len);
755         ie_start = pos;
756         *pos++ = WLAN_EID_SSID;
757         *pos++ = assoc_data->ssid_len;
758         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
759
760         /* add all rates which were marked to be used above */
761         supp_rates_len = rates_len;
762         if (supp_rates_len > 8)
763                 supp_rates_len = 8;
764
765         pos = skb_put(skb, supp_rates_len + 2);
766         *pos++ = WLAN_EID_SUPP_RATES;
767         *pos++ = supp_rates_len;
768
769         count = 0;
770         for (i = 0; i < sband->n_bitrates; i++) {
771                 if (BIT(i) & rates) {
772                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
773                                                 5 * (1 << shift));
774                         *pos++ = (u8) rate;
775                         if (++count == 8)
776                                 break;
777                 }
778         }
779
780         if (rates_len > count) {
781                 pos = skb_put(skb, rates_len - count + 2);
782                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
783                 *pos++ = rates_len - count;
784
785                 for (i++; i < sband->n_bitrates; i++) {
786                         if (BIT(i) & rates) {
787                                 int rate;
788                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
789                                                     5 * (1 << shift));
790                                 *pos++ = (u8) rate;
791                         }
792                 }
793         }
794
795         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
796             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
797                 pos = skb_put(skb, 4);
798                 *pos++ = WLAN_EID_PWR_CAPABILITY;
799                 *pos++ = 2;
800                 *pos++ = 0; /* min tx power */
801                  /* max tx power */
802                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
803         }
804
805         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
806                 /* TODO: get this in reg domain format */
807                 pos = skb_put(skb, 2 * sband->n_channels + 2);
808                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
809                 *pos++ = 2 * sband->n_channels;
810                 for (i = 0; i < sband->n_channels; i++) {
811                         *pos++ = ieee80211_frequency_to_channel(
812                                         sband->channels[i].center_freq);
813                         *pos++ = 1; /* one channel in the subband*/
814                 }
815         }
816
817         /* Set MBSSID support for HE AP if needed */
818         if (ieee80211_hw_check(&local->hw, SUPPORTS_ONLY_HE_MULTI_BSSID) &&
819             !(ifmgd->flags & IEEE80211_STA_DISABLE_HE) && assoc_data->ie_len) {
820                 struct element *elem;
821
822                 /* we know it's writable, cast away the const */
823                 elem = (void *)cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY,
824                                                   assoc_data->ie,
825                                                   assoc_data->ie_len);
826
827                 /* We can probably assume both always true */
828                 if (elem && elem->datalen >= 3)
829                         elem->data[2] |= WLAN_EXT_CAPA3_MULTI_BSSID_SUPPORT;
830         }
831
832         /* if present, add any custom IEs that go before HT */
833         if (assoc_data->ie_len) {
834                 static const u8 before_ht[] = {
835                         WLAN_EID_SSID,
836                         WLAN_EID_SUPP_RATES,
837                         WLAN_EID_EXT_SUPP_RATES,
838                         WLAN_EID_PWR_CAPABILITY,
839                         WLAN_EID_SUPPORTED_CHANNELS,
840                         WLAN_EID_RSN,
841                         WLAN_EID_QOS_CAPA,
842                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
843                         WLAN_EID_MOBILITY_DOMAIN,
844                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
845                         WLAN_EID_RIC_DATA,              /* reassoc only */
846                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
847                 };
848                 static const u8 after_ric[] = {
849                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
850                         WLAN_EID_HT_CAPABILITY,
851                         WLAN_EID_BSS_COEX_2040,
852                         /* luckily this is almost always there */
853                         WLAN_EID_EXT_CAPABILITY,
854                         WLAN_EID_QOS_TRAFFIC_CAPA,
855                         WLAN_EID_TIM_BCAST_REQ,
856                         WLAN_EID_INTERWORKING,
857                         /* 60 GHz (Multi-band, DMG, MMS) can't happen */
858                         WLAN_EID_VHT_CAPABILITY,
859                         WLAN_EID_OPMODE_NOTIF,
860                 };
861
862                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
863                                                  assoc_data->ie_len,
864                                                  before_ht,
865                                                  ARRAY_SIZE(before_ht),
866                                                  after_ric,
867                                                  ARRAY_SIZE(after_ric),
868                                                  offset);
869                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
870                 offset = noffset;
871         }
872
873         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
874                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
875                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
876
877         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
878                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
879                                     sband, chan, sdata->smps_mode);
880
881         /* if present, add any custom IEs that go before VHT */
882         if (assoc_data->ie_len) {
883                 static const u8 before_vht[] = {
884                         /*
885                          * no need to list the ones split off before HT
886                          * or generated here
887                          */
888                         WLAN_EID_BSS_COEX_2040,
889                         WLAN_EID_EXT_CAPABILITY,
890                         WLAN_EID_QOS_TRAFFIC_CAPA,
891                         WLAN_EID_TIM_BCAST_REQ,
892                         WLAN_EID_INTERWORKING,
893                         /* 60 GHz (Multi-band, DMG, MMS) can't happen */
894                 };
895
896                 /* RIC already taken above, so no need to handle here anymore */
897                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
898                                              before_vht, ARRAY_SIZE(before_vht),
899                                              offset);
900                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
901                 offset = noffset;
902         }
903
904         /* if present, add any custom IEs that go before HE */
905         if (assoc_data->ie_len) {
906                 static const u8 before_he[] = {
907                         /*
908                          * no need to list the ones split off before VHT
909                          * or generated here
910                          */
911                         WLAN_EID_OPMODE_NOTIF,
912                         WLAN_EID_EXTENSION, WLAN_EID_EXT_FUTURE_CHAN_GUIDANCE,
913                         /* 11ai elements */
914                         WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_SESSION,
915                         WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_PUBLIC_KEY,
916                         WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_KEY_CONFIRM,
917                         WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_HLP_CONTAINER,
918                         WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_IP_ADDR_ASSIGN,
919                         /* TODO: add 11ah/11aj/11ak elements */
920                 };
921
922                 /* RIC already taken above, so no need to handle here anymore */
923                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
924                                              before_he, ARRAY_SIZE(before_he),
925                                              offset);
926                 pos = skb_put(skb, noffset - offset);
927                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
928                 offset = noffset;
929         }
930
931         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
932                 ieee80211_add_vht_ie(sdata, skb, sband,
933                                      &assoc_data->ap_vht_cap);
934
935         /*
936          * If AP doesn't support HT, mark HE as disabled.
937          * If on the 5GHz band, make sure it supports VHT.
938          */
939         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT ||
940             (sband->band == NL80211_BAND_5GHZ &&
941              ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
942                 ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
943
944         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
945                 ieee80211_add_he_ie(sdata, skb, sband);
946
947         /* if present, add any custom non-vendor IEs that go after HE */
948         if (assoc_data->ie_len) {
949                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
950                                                     assoc_data->ie_len,
951                                                     offset);
952                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
953                 offset = noffset;
954         }
955
956         if (assoc_data->wmm) {
957                 if (assoc_data->uapsd) {
958                         qos_info = ifmgd->uapsd_queues;
959                         qos_info |= (ifmgd->uapsd_max_sp_len <<
960                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
961                 } else {
962                         qos_info = 0;
963                 }
964
965                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
966         }
967
968         /* add any remaining custom (i.e. vendor specific here) IEs */
969         if (assoc_data->ie_len) {
970                 noffset = assoc_data->ie_len;
971                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
972         }
973
974         if (assoc_data->fils_kek_len &&
975             fils_encrypt_assoc_req(skb, assoc_data) < 0) {
976                 dev_kfree_skb(skb);
977                 return;
978         }
979
980         pos = skb_tail_pointer(skb);
981         kfree(ifmgd->assoc_req_ies);
982         ifmgd->assoc_req_ies = kmemdup(ie_start, pos - ie_start, GFP_ATOMIC);
983         ifmgd->assoc_req_ies_len = pos - ie_start;
984
985         drv_mgd_prepare_tx(local, sdata, 0);
986
987         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
988         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
989                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
990                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
991         ieee80211_tx_skb(sdata, skb);
992 }
993
994 void ieee80211_send_pspoll(struct ieee80211_local *local,
995                            struct ieee80211_sub_if_data *sdata)
996 {
997         struct ieee80211_pspoll *pspoll;
998         struct sk_buff *skb;
999
1000         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
1001         if (!skb)
1002                 return;
1003
1004         pspoll = (struct ieee80211_pspoll *) skb->data;
1005         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
1006
1007         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1008         ieee80211_tx_skb(sdata, skb);
1009 }
1010
1011 void ieee80211_send_nullfunc(struct ieee80211_local *local,
1012                              struct ieee80211_sub_if_data *sdata,
1013                              bool powersave)
1014 {
1015         struct sk_buff *skb;
1016         struct ieee80211_hdr_3addr *nullfunc;
1017         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1018
1019         /* Don't send NDPs when STA is connected HE */
1020         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1021             !(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
1022                 return;
1023
1024         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif,
1025                 !ieee80211_hw_check(&local->hw, DOESNT_SUPPORT_QOS_NDP));
1026         if (!skb)
1027                 return;
1028
1029         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
1030         if (powersave)
1031                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
1032
1033         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1034                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
1035
1036         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1037                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1038
1039         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
1040                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
1041
1042         ieee80211_tx_skb(sdata, skb);
1043 }
1044
1045 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
1046                                           struct ieee80211_sub_if_data *sdata)
1047 {
1048         struct sk_buff *skb;
1049         struct ieee80211_hdr *nullfunc;
1050         __le16 fc;
1051
1052         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1053                 return;
1054
1055         /* Don't send NDPs when connected HE */
1056         if (!(sdata->u.mgd.flags & IEEE80211_STA_DISABLE_HE))
1057                 return;
1058
1059         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
1060         if (!skb)
1061                 return;
1062
1063         skb_reserve(skb, local->hw.extra_tx_headroom);
1064
1065         nullfunc = skb_put_zero(skb, 30);
1066         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
1067                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1068         nullfunc->frame_control = fc;
1069         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
1070         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1071         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
1072         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
1073
1074         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1075         ieee80211_tx_skb(sdata, skb);
1076 }
1077
1078 /* spectrum management related things */
1079 static void ieee80211_chswitch_work(struct work_struct *work)
1080 {
1081         struct ieee80211_sub_if_data *sdata =
1082                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
1083         struct ieee80211_local *local = sdata->local;
1084         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1085         int ret;
1086
1087         if (!ieee80211_sdata_running(sdata))
1088                 return;
1089
1090         sdata_lock(sdata);
1091         mutex_lock(&local->mtx);
1092         mutex_lock(&local->chanctx_mtx);
1093
1094         if (!ifmgd->associated)
1095                 goto out;
1096
1097         if (!sdata->vif.csa_active)
1098                 goto out;
1099
1100         /*
1101          * using reservation isn't immediate as it may be deferred until later
1102          * with multi-vif. once reservation is complete it will re-schedule the
1103          * work with no reserved_chanctx so verify chandef to check if it
1104          * completed successfully
1105          */
1106
1107         if (sdata->reserved_chanctx) {
1108                 struct ieee80211_supported_band *sband = NULL;
1109                 struct sta_info *mgd_sta = NULL;
1110                 enum ieee80211_sta_rx_bandwidth bw = IEEE80211_STA_RX_BW_20;
1111
1112                 /*
1113                  * with multi-vif csa driver may call ieee80211_csa_finish()
1114                  * many times while waiting for other interfaces to use their
1115                  * reservations
1116                  */
1117                 if (sdata->reserved_ready)
1118                         goto out;
1119
1120                 if (sdata->vif.bss_conf.chandef.width !=
1121                     sdata->csa_chandef.width) {
1122                         /*
1123                          * For managed interface, we need to also update the AP
1124                          * station bandwidth and align the rate scale algorithm
1125                          * on the bandwidth change. Here we only consider the
1126                          * bandwidth of the new channel definition (as channel
1127                          * switch flow does not have the full HT/VHT/HE
1128                          * information), assuming that if additional changes are
1129                          * required they would be done as part of the processing
1130                          * of the next beacon from the AP.
1131                          */
1132                         switch (sdata->csa_chandef.width) {
1133                         case NL80211_CHAN_WIDTH_20_NOHT:
1134                         case NL80211_CHAN_WIDTH_20:
1135                         default:
1136                                 bw = IEEE80211_STA_RX_BW_20;
1137                                 break;
1138                         case NL80211_CHAN_WIDTH_40:
1139                                 bw = IEEE80211_STA_RX_BW_40;
1140                                 break;
1141                         case NL80211_CHAN_WIDTH_80:
1142                                 bw = IEEE80211_STA_RX_BW_80;
1143                                 break;
1144                         case NL80211_CHAN_WIDTH_80P80:
1145                         case NL80211_CHAN_WIDTH_160:
1146                                 bw = IEEE80211_STA_RX_BW_160;
1147                                 break;
1148                         }
1149
1150                         mgd_sta = sta_info_get(sdata, ifmgd->bssid);
1151                         sband =
1152                                 local->hw.wiphy->bands[sdata->csa_chandef.chan->band];
1153                 }
1154
1155                 if (sdata->vif.bss_conf.chandef.width >
1156                     sdata->csa_chandef.width) {
1157                         mgd_sta->sta.bandwidth = bw;
1158                         rate_control_rate_update(local, sband, mgd_sta,
1159                                                  IEEE80211_RC_BW_CHANGED);
1160                 }
1161
1162                 ret = ieee80211_vif_use_reserved_context(sdata);
1163                 if (ret) {
1164                         sdata_info(sdata,
1165                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1166                                    ret);
1167                         ieee80211_queue_work(&sdata->local->hw,
1168                                              &ifmgd->csa_connection_drop_work);
1169                         goto out;
1170                 }
1171
1172                 if (sdata->vif.bss_conf.chandef.width <
1173                     sdata->csa_chandef.width) {
1174                         mgd_sta->sta.bandwidth = bw;
1175                         rate_control_rate_update(local, sband, mgd_sta,
1176                                                  IEEE80211_RC_BW_CHANGED);
1177                 }
1178
1179                 goto out;
1180         }
1181
1182         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1183                                         &sdata->csa_chandef)) {
1184                 sdata_info(sdata,
1185                            "failed to finalize channel switch, disconnecting\n");
1186                 ieee80211_queue_work(&sdata->local->hw,
1187                                      &ifmgd->csa_connection_drop_work);
1188                 goto out;
1189         }
1190
1191         ifmgd->csa_waiting_bcn = true;
1192
1193         ieee80211_sta_reset_beacon_monitor(sdata);
1194         ieee80211_sta_reset_conn_monitor(sdata);
1195
1196 out:
1197         mutex_unlock(&local->chanctx_mtx);
1198         mutex_unlock(&local->mtx);
1199         sdata_unlock(sdata);
1200 }
1201
1202 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1203 {
1204         struct ieee80211_local *local = sdata->local;
1205         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1206         int ret;
1207
1208         sdata_assert_lock(sdata);
1209
1210         WARN_ON(!sdata->vif.csa_active);
1211
1212         if (sdata->csa_block_tx) {
1213                 ieee80211_wake_vif_queues(local, sdata,
1214                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1215                 sdata->csa_block_tx = false;
1216         }
1217
1218         sdata->vif.csa_active = false;
1219         ifmgd->csa_waiting_bcn = false;
1220
1221         ret = drv_post_channel_switch(sdata);
1222         if (ret) {
1223                 sdata_info(sdata,
1224                            "driver post channel switch failed, disconnecting\n");
1225                 ieee80211_queue_work(&local->hw,
1226                                      &ifmgd->csa_connection_drop_work);
1227                 return;
1228         }
1229
1230         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1231 }
1232
1233 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1234 {
1235         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1236         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1237
1238         trace_api_chswitch_done(sdata, success);
1239         if (!success) {
1240                 sdata_info(sdata,
1241                            "driver channel switch failed, disconnecting\n");
1242                 ieee80211_queue_work(&sdata->local->hw,
1243                                      &ifmgd->csa_connection_drop_work);
1244         } else {
1245                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1246         }
1247 }
1248 EXPORT_SYMBOL(ieee80211_chswitch_done);
1249
1250 static void ieee80211_chswitch_timer(struct timer_list *t)
1251 {
1252         struct ieee80211_sub_if_data *sdata =
1253                 from_timer(sdata, t, u.mgd.chswitch_timer);
1254
1255         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1256 }
1257
1258 static void
1259 ieee80211_sta_abort_chanswitch(struct ieee80211_sub_if_data *sdata)
1260 {
1261         struct ieee80211_local *local = sdata->local;
1262
1263         if (!local->ops->abort_channel_switch)
1264                 return;
1265
1266         mutex_lock(&local->mtx);
1267
1268         mutex_lock(&local->chanctx_mtx);
1269         ieee80211_vif_unreserve_chanctx(sdata);
1270         mutex_unlock(&local->chanctx_mtx);
1271
1272         if (sdata->csa_block_tx)
1273                 ieee80211_wake_vif_queues(local, sdata,
1274                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1275
1276         sdata->csa_block_tx = false;
1277         sdata->vif.csa_active = false;
1278
1279         mutex_unlock(&local->mtx);
1280
1281         drv_abort_channel_switch(sdata);
1282 }
1283
1284 static void
1285 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1286                                  u64 timestamp, u32 device_timestamp,
1287                                  struct ieee802_11_elems *elems,
1288                                  bool beacon)
1289 {
1290         struct ieee80211_local *local = sdata->local;
1291         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1292         struct cfg80211_bss *cbss = ifmgd->associated;
1293         struct ieee80211_chanctx_conf *conf;
1294         struct ieee80211_chanctx *chanctx;
1295         enum nl80211_band current_band;
1296         struct ieee80211_csa_ie csa_ie;
1297         struct ieee80211_channel_switch ch_switch;
1298         int res;
1299
1300         sdata_assert_lock(sdata);
1301
1302         if (!cbss)
1303                 return;
1304
1305         if (local->scanning)
1306                 return;
1307
1308         current_band = cbss->channel->band;
1309         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1310                                            ifmgd->flags,
1311                                            ifmgd->associated->bssid, &csa_ie);
1312
1313         if (!res) {
1314                 ch_switch.timestamp = timestamp;
1315                 ch_switch.device_timestamp = device_timestamp;
1316                 ch_switch.block_tx =  beacon ? csa_ie.mode : 0;
1317                 ch_switch.chandef = csa_ie.chandef;
1318                 ch_switch.count = csa_ie.count;
1319                 ch_switch.delay = csa_ie.max_switch_time;
1320         }
1321
1322         if (res < 0) {
1323                 ieee80211_queue_work(&local->hw,
1324                                      &ifmgd->csa_connection_drop_work);
1325                 return;
1326         }
1327
1328         if (beacon && sdata->vif.csa_active && !ifmgd->csa_waiting_bcn) {
1329                 if (res)
1330                         ieee80211_sta_abort_chanswitch(sdata);
1331                 else
1332                         drv_channel_switch_rx_beacon(sdata, &ch_switch);
1333                 return;
1334         } else if (sdata->vif.csa_active || res) {
1335                 /* disregard subsequent announcements if already processing */
1336                 return;
1337         }
1338
1339         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1340                                      IEEE80211_CHAN_DISABLED)) {
1341                 sdata_info(sdata,
1342                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1343                            ifmgd->associated->bssid,
1344                            csa_ie.chandef.chan->center_freq,
1345                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1346                            csa_ie.chandef.center_freq2);
1347                 ieee80211_queue_work(&local->hw,
1348                                      &ifmgd->csa_connection_drop_work);
1349                 return;
1350         }
1351
1352         if (cfg80211_chandef_identical(&csa_ie.chandef,
1353                                        &sdata->vif.bss_conf.chandef) &&
1354             (!csa_ie.mode || !beacon)) {
1355                 if (ifmgd->csa_ignored_same_chan)
1356                         return;
1357                 sdata_info(sdata,
1358                            "AP %pM tries to chanswitch to same channel, ignore\n",
1359                            ifmgd->associated->bssid);
1360                 ifmgd->csa_ignored_same_chan = true;
1361                 return;
1362         }
1363
1364         /*
1365          * Drop all TDLS peers - either we disconnect or move to a different
1366          * channel from this point on. There's no telling what our peer will do.
1367          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1368          * have an incompatible wider chandef.
1369          */
1370         ieee80211_teardown_tdls_peers(sdata);
1371
1372         mutex_lock(&local->mtx);
1373         mutex_lock(&local->chanctx_mtx);
1374         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1375                                          lockdep_is_held(&local->chanctx_mtx));
1376         if (!conf) {
1377                 sdata_info(sdata,
1378                            "no channel context assigned to vif?, disconnecting\n");
1379                 goto drop_connection;
1380         }
1381
1382         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1383
1384         if (local->use_chanctx &&
1385             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1386                 sdata_info(sdata,
1387                            "driver doesn't support chan-switch with channel contexts\n");
1388                 goto drop_connection;
1389         }
1390
1391         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1392                 sdata_info(sdata,
1393                            "preparing for channel switch failed, disconnecting\n");
1394                 goto drop_connection;
1395         }
1396
1397         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1398                                             chanctx->mode, false);
1399         if (res) {
1400                 sdata_info(sdata,
1401                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1402                            res);
1403                 goto drop_connection;
1404         }
1405         mutex_unlock(&local->chanctx_mtx);
1406
1407         sdata->vif.csa_active = true;
1408         sdata->csa_chandef = csa_ie.chandef;
1409         sdata->csa_block_tx = ch_switch.block_tx;
1410         ifmgd->csa_ignored_same_chan = false;
1411
1412         if (sdata->csa_block_tx)
1413                 ieee80211_stop_vif_queues(local, sdata,
1414                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1415         mutex_unlock(&local->mtx);
1416
1417         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1418                                           csa_ie.count);
1419
1420         if (local->ops->channel_switch) {
1421                 /* use driver's channel switch callback */
1422                 drv_channel_switch(local, sdata, &ch_switch);
1423                 return;
1424         }
1425
1426         /* channel switch handled in software */
1427         if (csa_ie.count <= 1)
1428                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1429         else
1430                 mod_timer(&ifmgd->chswitch_timer,
1431                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1432                                          cbss->beacon_interval));
1433         return;
1434  drop_connection:
1435         /*
1436          * This is just so that the disconnect flow will know that
1437          * we were trying to switch channel and failed. In case the
1438          * mode is 1 (we are not allowed to Tx), we will know not to
1439          * send a deauthentication frame. Those two fields will be
1440          * reset when the disconnection worker runs.
1441          */
1442         sdata->vif.csa_active = true;
1443         sdata->csa_block_tx = ch_switch.block_tx;
1444
1445         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1446         mutex_unlock(&local->chanctx_mtx);
1447         mutex_unlock(&local->mtx);
1448 }
1449
1450 static bool
1451 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1452                                  struct ieee80211_channel *channel,
1453                                  const u8 *country_ie, u8 country_ie_len,
1454                                  const u8 *pwr_constr_elem,
1455                                  int *chan_pwr, int *pwr_reduction)
1456 {
1457         struct ieee80211_country_ie_triplet *triplet;
1458         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1459         int i, chan_increment;
1460         bool have_chan_pwr = false;
1461
1462         /* Invalid IE */
1463         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1464                 return false;
1465
1466         triplet = (void *)(country_ie + 3);
1467         country_ie_len -= 3;
1468
1469         switch (channel->band) {
1470         default:
1471                 WARN_ON_ONCE(1);
1472                 /* fall through */
1473         case NL80211_BAND_2GHZ:
1474         case NL80211_BAND_60GHZ:
1475                 chan_increment = 1;
1476                 break;
1477         case NL80211_BAND_5GHZ:
1478                 chan_increment = 4;
1479                 break;
1480         }
1481
1482         /* find channel */
1483         while (country_ie_len >= 3) {
1484                 u8 first_channel = triplet->chans.first_channel;
1485
1486                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1487                         goto next;
1488
1489                 for (i = 0; i < triplet->chans.num_channels; i++) {
1490                         if (first_channel + i * chan_increment == chan) {
1491                                 have_chan_pwr = true;
1492                                 *chan_pwr = triplet->chans.max_power;
1493                                 break;
1494                         }
1495                 }
1496                 if (have_chan_pwr)
1497                         break;
1498
1499  next:
1500                 triplet++;
1501                 country_ie_len -= 3;
1502         }
1503
1504         if (have_chan_pwr && pwr_constr_elem)
1505                 *pwr_reduction = *pwr_constr_elem;
1506         else
1507                 *pwr_reduction = 0;
1508
1509         return have_chan_pwr;
1510 }
1511
1512 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1513                                       struct ieee80211_channel *channel,
1514                                       const u8 *cisco_dtpc_ie,
1515                                       int *pwr_level)
1516 {
1517         /* From practical testing, the first data byte of the DTPC element
1518          * seems to contain the requested dBm level, and the CLI on Cisco
1519          * APs clearly state the range is -127 to 127 dBm, which indicates
1520          * a signed byte, although it seemingly never actually goes negative.
1521          * The other byte seems to always be zero.
1522          */
1523         *pwr_level = (__s8)cisco_dtpc_ie[4];
1524 }
1525
1526 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1527                                        struct ieee80211_channel *channel,
1528                                        struct ieee80211_mgmt *mgmt,
1529                                        const u8 *country_ie, u8 country_ie_len,
1530                                        const u8 *pwr_constr_ie,
1531                                        const u8 *cisco_dtpc_ie)
1532 {
1533         bool has_80211h_pwr = false, has_cisco_pwr = false;
1534         int chan_pwr = 0, pwr_reduction_80211h = 0;
1535         int pwr_level_cisco, pwr_level_80211h;
1536         int new_ap_level;
1537         __le16 capab = mgmt->u.probe_resp.capab_info;
1538
1539         if (country_ie &&
1540             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1541              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1542                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1543                         sdata, channel, country_ie, country_ie_len,
1544                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1545                 pwr_level_80211h =
1546                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1547         }
1548
1549         if (cisco_dtpc_ie) {
1550                 ieee80211_find_cisco_dtpc(
1551                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1552                 has_cisco_pwr = true;
1553         }
1554
1555         if (!has_80211h_pwr && !has_cisco_pwr)
1556                 return 0;
1557
1558         /* If we have both 802.11h and Cisco DTPC, apply both limits
1559          * by picking the smallest of the two power levels advertised.
1560          */
1561         if (has_80211h_pwr &&
1562             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1563                 new_ap_level = pwr_level_80211h;
1564
1565                 if (sdata->ap_power_level == new_ap_level)
1566                         return 0;
1567
1568                 sdata_dbg(sdata,
1569                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1570                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1571                           sdata->u.mgd.bssid);
1572         } else {  /* has_cisco_pwr is always true here. */
1573                 new_ap_level = pwr_level_cisco;
1574
1575                 if (sdata->ap_power_level == new_ap_level)
1576                         return 0;
1577
1578                 sdata_dbg(sdata,
1579                           "Limiting TX power to %d dBm as advertised by %pM\n",
1580                           pwr_level_cisco, sdata->u.mgd.bssid);
1581         }
1582
1583         sdata->ap_power_level = new_ap_level;
1584         if (__ieee80211_recalc_txpower(sdata))
1585                 return BSS_CHANGED_TXPOWER;
1586         return 0;
1587 }
1588
1589 /* powersave */
1590 static void ieee80211_enable_ps(struct ieee80211_local *local,
1591                                 struct ieee80211_sub_if_data *sdata)
1592 {
1593         struct ieee80211_conf *conf = &local->hw.conf;
1594
1595         /*
1596          * If we are scanning right now then the parameters will
1597          * take effect when scan finishes.
1598          */
1599         if (local->scanning)
1600                 return;
1601
1602         if (conf->dynamic_ps_timeout > 0 &&
1603             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1604                 mod_timer(&local->dynamic_ps_timer, jiffies +
1605                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1606         } else {
1607                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1608                         ieee80211_send_nullfunc(local, sdata, true);
1609
1610                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1611                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1612                         return;
1613
1614                 conf->flags |= IEEE80211_CONF_PS;
1615                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1616         }
1617 }
1618
1619 static void ieee80211_change_ps(struct ieee80211_local *local)
1620 {
1621         struct ieee80211_conf *conf = &local->hw.conf;
1622
1623         if (local->ps_sdata) {
1624                 ieee80211_enable_ps(local, local->ps_sdata);
1625         } else if (conf->flags & IEEE80211_CONF_PS) {
1626                 conf->flags &= ~IEEE80211_CONF_PS;
1627                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1628                 del_timer_sync(&local->dynamic_ps_timer);
1629                 cancel_work_sync(&local->dynamic_ps_enable_work);
1630         }
1631 }
1632
1633 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1634 {
1635         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1636         struct sta_info *sta = NULL;
1637         bool authorized = false;
1638
1639         if (!mgd->powersave)
1640                 return false;
1641
1642         if (mgd->broken_ap)
1643                 return false;
1644
1645         if (!mgd->associated)
1646                 return false;
1647
1648         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1649                 return false;
1650
1651         if (!mgd->have_beacon)
1652                 return false;
1653
1654         rcu_read_lock();
1655         sta = sta_info_get(sdata, mgd->bssid);
1656         if (sta)
1657                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1658         rcu_read_unlock();
1659
1660         return authorized;
1661 }
1662
1663 /* need to hold RTNL or interface lock */
1664 void ieee80211_recalc_ps(struct ieee80211_local *local)
1665 {
1666         struct ieee80211_sub_if_data *sdata, *found = NULL;
1667         int count = 0;
1668         int timeout;
1669
1670         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1671                 local->ps_sdata = NULL;
1672                 return;
1673         }
1674
1675         list_for_each_entry(sdata, &local->interfaces, list) {
1676                 if (!ieee80211_sdata_running(sdata))
1677                         continue;
1678                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1679                         /* If an AP vif is found, then disable PS
1680                          * by setting the count to zero thereby setting
1681                          * ps_sdata to NULL.
1682                          */
1683                         count = 0;
1684                         break;
1685                 }
1686                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1687                         continue;
1688                 found = sdata;
1689                 count++;
1690         }
1691
1692         if (count == 1 && ieee80211_powersave_allowed(found)) {
1693                 u8 dtimper = found->u.mgd.dtim_period;
1694
1695                 timeout = local->dynamic_ps_forced_timeout;
1696                 if (timeout < 0)
1697                         timeout = 100;
1698                 local->hw.conf.dynamic_ps_timeout = timeout;
1699
1700                 /* If the TIM IE is invalid, pretend the value is 1 */
1701                 if (!dtimper)
1702                         dtimper = 1;
1703
1704                 local->hw.conf.ps_dtim_period = dtimper;
1705                 local->ps_sdata = found;
1706         } else {
1707                 local->ps_sdata = NULL;
1708         }
1709
1710         ieee80211_change_ps(local);
1711 }
1712
1713 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1714 {
1715         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1716
1717         if (sdata->vif.bss_conf.ps != ps_allowed) {
1718                 sdata->vif.bss_conf.ps = ps_allowed;
1719                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1720         }
1721 }
1722
1723 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1724 {
1725         struct ieee80211_local *local =
1726                 container_of(work, struct ieee80211_local,
1727                              dynamic_ps_disable_work);
1728
1729         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1730                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1731                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1732         }
1733
1734         ieee80211_wake_queues_by_reason(&local->hw,
1735                                         IEEE80211_MAX_QUEUE_MAP,
1736                                         IEEE80211_QUEUE_STOP_REASON_PS,
1737                                         false);
1738 }
1739
1740 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1741 {
1742         struct ieee80211_local *local =
1743                 container_of(work, struct ieee80211_local,
1744                              dynamic_ps_enable_work);
1745         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1746         struct ieee80211_if_managed *ifmgd;
1747         unsigned long flags;
1748         int q;
1749
1750         /* can only happen when PS was just disabled anyway */
1751         if (!sdata)
1752                 return;
1753
1754         ifmgd = &sdata->u.mgd;
1755
1756         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1757                 return;
1758
1759         if (local->hw.conf.dynamic_ps_timeout > 0) {
1760                 /* don't enter PS if TX frames are pending */
1761                 if (drv_tx_frames_pending(local)) {
1762                         mod_timer(&local->dynamic_ps_timer, jiffies +
1763                                   msecs_to_jiffies(
1764                                   local->hw.conf.dynamic_ps_timeout));
1765                         return;
1766                 }
1767
1768                 /*
1769                  * transmission can be stopped by others which leads to
1770                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1771                  * is not the actual idle state.
1772                  */
1773                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1774                 for (q = 0; q < local->hw.queues; q++) {
1775                         if (local->queue_stop_reasons[q]) {
1776                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1777                                                        flags);
1778                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1779                                           msecs_to_jiffies(
1780                                           local->hw.conf.dynamic_ps_timeout));
1781                                 return;
1782                         }
1783                 }
1784                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1785         }
1786
1787         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1788             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1789                 if (drv_tx_frames_pending(local)) {
1790                         mod_timer(&local->dynamic_ps_timer, jiffies +
1791                                   msecs_to_jiffies(
1792                                   local->hw.conf.dynamic_ps_timeout));
1793                 } else {
1794                         ieee80211_send_nullfunc(local, sdata, true);
1795                         /* Flush to get the tx status of nullfunc frame */
1796                         ieee80211_flush_queues(local, sdata, false);
1797                 }
1798         }
1799
1800         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1801               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1802             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1803                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1804                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1805                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1806         }
1807 }
1808
1809 void ieee80211_dynamic_ps_timer(struct timer_list *t)
1810 {
1811         struct ieee80211_local *local = from_timer(local, t, dynamic_ps_timer);
1812
1813         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1814 }
1815
1816 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1817 {
1818         struct delayed_work *delayed_work = to_delayed_work(work);
1819         struct ieee80211_sub_if_data *sdata =
1820                 container_of(delayed_work, struct ieee80211_sub_if_data,
1821                              dfs_cac_timer_work);
1822         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1823
1824         mutex_lock(&sdata->local->mtx);
1825         if (sdata->wdev.cac_started) {
1826                 ieee80211_vif_release_channel(sdata);
1827                 cfg80211_cac_event(sdata->dev, &chandef,
1828                                    NL80211_RADAR_CAC_FINISHED,
1829                                    GFP_KERNEL);
1830         }
1831         mutex_unlock(&sdata->local->mtx);
1832 }
1833
1834 static bool
1835 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1836 {
1837         struct ieee80211_local *local = sdata->local;
1838         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1839         bool ret = false;
1840         int ac;
1841
1842         if (local->hw.queues < IEEE80211_NUM_ACS)
1843                 return false;
1844
1845         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1846                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1847                 int non_acm_ac;
1848                 unsigned long now = jiffies;
1849
1850                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1851                     tx_tspec->admitted_time &&
1852                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1853                         tx_tspec->consumed_tx_time = 0;
1854                         tx_tspec->time_slice_start = now;
1855
1856                         if (tx_tspec->downgraded)
1857                                 tx_tspec->action =
1858                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1859                 }
1860
1861                 switch (tx_tspec->action) {
1862                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1863                         /* take the original parameters */
1864                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1865                                 sdata_err(sdata,
1866                                           "failed to set TX queue parameters for queue %d\n",
1867                                           ac);
1868                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1869                         tx_tspec->downgraded = false;
1870                         ret = true;
1871                         break;
1872                 case TX_TSPEC_ACTION_DOWNGRADE:
1873                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1874                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1875                                 ret = true;
1876                                 break;
1877                         }
1878                         /* downgrade next lower non-ACM AC */
1879                         for (non_acm_ac = ac + 1;
1880                              non_acm_ac < IEEE80211_NUM_ACS;
1881                              non_acm_ac++)
1882                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1883                                         break;
1884                         /* Usually the loop will result in using BK even if it
1885                          * requires admission control, but such a configuration
1886                          * makes no sense and we have to transmit somehow - the
1887                          * AC selection does the same thing.
1888                          * If we started out trying to downgrade from BK, then
1889                          * the extra condition here might be needed.
1890                          */
1891                         if (non_acm_ac >= IEEE80211_NUM_ACS)
1892                                 non_acm_ac = IEEE80211_AC_BK;
1893                         if (drv_conf_tx(local, sdata, ac,
1894                                         &sdata->tx_conf[non_acm_ac]))
1895                                 sdata_err(sdata,
1896                                           "failed to set TX queue parameters for queue %d\n",
1897                                           ac);
1898                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1899                         ret = true;
1900                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1901                                 tx_tspec->time_slice_start + HZ - now + 1);
1902                         break;
1903                 case TX_TSPEC_ACTION_NONE:
1904                         /* nothing now */
1905                         break;
1906                 }
1907         }
1908
1909         return ret;
1910 }
1911
1912 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1913 {
1914         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1915                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1916 }
1917
1918 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1919 {
1920         struct ieee80211_sub_if_data *sdata;
1921
1922         sdata = container_of(work, struct ieee80211_sub_if_data,
1923                              u.mgd.tx_tspec_wk.work);
1924         ieee80211_sta_handle_tspec_ac_params(sdata);
1925 }
1926
1927 /* MLME */
1928 static bool
1929 ieee80211_sta_wmm_params(struct ieee80211_local *local,
1930                          struct ieee80211_sub_if_data *sdata,
1931                          const u8 *wmm_param, size_t wmm_param_len,
1932                          const struct ieee80211_mu_edca_param_set *mu_edca)
1933 {
1934         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1935         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1936         size_t left;
1937         int count, mu_edca_count, ac;
1938         const u8 *pos;
1939         u8 uapsd_queues = 0;
1940
1941         if (!local->ops->conf_tx)
1942                 return false;
1943
1944         if (local->hw.queues < IEEE80211_NUM_ACS)
1945                 return false;
1946
1947         if (!wmm_param)
1948                 return false;
1949
1950         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1951                 return false;
1952
1953         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1954                 uapsd_queues = ifmgd->uapsd_queues;
1955
1956         count = wmm_param[6] & 0x0f;
1957         /* -1 is the initial value of ifmgd->mu_edca_last_param_set.
1958          * if mu_edca was preset before and now it disappeared tell
1959          * the driver about it.
1960          */
1961         mu_edca_count = mu_edca ? mu_edca->mu_qos_info & 0x0f : -1;
1962         if (count == ifmgd->wmm_last_param_set &&
1963             mu_edca_count == ifmgd->mu_edca_last_param_set)
1964                 return false;
1965         ifmgd->wmm_last_param_set = count;
1966         ifmgd->mu_edca_last_param_set = mu_edca_count;
1967
1968         pos = wmm_param + 8;
1969         left = wmm_param_len - 8;
1970
1971         memset(&params, 0, sizeof(params));
1972
1973         sdata->wmm_acm = 0;
1974         for (; left >= 4; left -= 4, pos += 4) {
1975                 int aci = (pos[0] >> 5) & 0x03;
1976                 int acm = (pos[0] >> 4) & 0x01;
1977                 bool uapsd = false;
1978
1979                 switch (aci) {
1980                 case 1: /* AC_BK */
1981                         ac = IEEE80211_AC_BK;
1982                         if (acm)
1983                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1984                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1985                                 uapsd = true;
1986                         params[ac].mu_edca = !!mu_edca;
1987                         if (mu_edca)
1988                                 params[ac].mu_edca_param_rec = mu_edca->ac_bk;
1989                         break;
1990                 case 2: /* AC_VI */
1991                         ac = IEEE80211_AC_VI;
1992                         if (acm)
1993                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1994                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1995                                 uapsd = true;
1996                         params[ac].mu_edca = !!mu_edca;
1997                         if (mu_edca)
1998                                 params[ac].mu_edca_param_rec = mu_edca->ac_vi;
1999                         break;
2000                 case 3: /* AC_VO */
2001                         ac = IEEE80211_AC_VO;
2002                         if (acm)
2003                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
2004                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
2005                                 uapsd = true;
2006                         params[ac].mu_edca = !!mu_edca;
2007                         if (mu_edca)
2008                                 params[ac].mu_edca_param_rec = mu_edca->ac_vo;
2009                         break;
2010                 case 0: /* AC_BE */
2011                 default:
2012                         ac = IEEE80211_AC_BE;
2013                         if (acm)
2014                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
2015                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
2016                                 uapsd = true;
2017                         params[ac].mu_edca = !!mu_edca;
2018                         if (mu_edca)
2019                                 params[ac].mu_edca_param_rec = mu_edca->ac_be;
2020                         break;
2021                 }
2022
2023                 params[ac].aifs = pos[0] & 0x0f;
2024
2025                 if (params[ac].aifs < 2) {
2026                         sdata_info(sdata,
2027                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
2028                                    params[ac].aifs, aci);
2029                         params[ac].aifs = 2;
2030                 }
2031                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
2032                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
2033                 params[ac].txop = get_unaligned_le16(pos + 2);
2034                 params[ac].acm = acm;
2035                 params[ac].uapsd = uapsd;
2036
2037                 if (params[ac].cw_min == 0 ||
2038                     params[ac].cw_min > params[ac].cw_max) {
2039                         sdata_info(sdata,
2040                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
2041                                    params[ac].cw_min, params[ac].cw_max, aci);
2042                         return false;
2043                 }
2044                 ieee80211_regulatory_limit_wmm_params(sdata, &params[ac], ac);
2045         }
2046
2047         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
2048                 mlme_dbg(sdata,
2049                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
2050                          ac, params[ac].acm,
2051                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
2052                          params[ac].txop, params[ac].uapsd,
2053                          ifmgd->tx_tspec[ac].downgraded);
2054                 sdata->tx_conf[ac] = params[ac];
2055                 if (!ifmgd->tx_tspec[ac].downgraded &&
2056                     drv_conf_tx(local, sdata, ac, &params[ac]))
2057                         sdata_err(sdata,
2058                                   "failed to set TX queue parameters for AC %d\n",
2059                                   ac);
2060         }
2061
2062         /* enable WMM or activate new settings */
2063         sdata->vif.bss_conf.qos = true;
2064         return true;
2065 }
2066
2067 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
2068 {
2069         lockdep_assert_held(&sdata->local->mtx);
2070
2071         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
2072         ieee80211_run_deferred_scan(sdata->local);
2073 }
2074
2075 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
2076 {
2077         mutex_lock(&sdata->local->mtx);
2078         __ieee80211_stop_poll(sdata);
2079         mutex_unlock(&sdata->local->mtx);
2080 }
2081
2082 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
2083                                            u16 capab, bool erp_valid, u8 erp)
2084 {
2085         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2086         struct ieee80211_supported_band *sband;
2087         u32 changed = 0;
2088         bool use_protection;
2089         bool use_short_preamble;
2090         bool use_short_slot;
2091
2092         sband = ieee80211_get_sband(sdata);
2093         if (!sband)
2094                 return changed;
2095
2096         if (erp_valid) {
2097                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
2098                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
2099         } else {
2100                 use_protection = false;
2101                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
2102         }
2103
2104         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
2105         if (sband->band == NL80211_BAND_5GHZ)
2106                 use_short_slot = true;
2107
2108         if (use_protection != bss_conf->use_cts_prot) {
2109                 bss_conf->use_cts_prot = use_protection;
2110                 changed |= BSS_CHANGED_ERP_CTS_PROT;
2111         }
2112
2113         if (use_short_preamble != bss_conf->use_short_preamble) {
2114                 bss_conf->use_short_preamble = use_short_preamble;
2115                 changed |= BSS_CHANGED_ERP_PREAMBLE;
2116         }
2117
2118         if (use_short_slot != bss_conf->use_short_slot) {
2119                 bss_conf->use_short_slot = use_short_slot;
2120                 changed |= BSS_CHANGED_ERP_SLOT;
2121         }
2122
2123         return changed;
2124 }
2125
2126 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
2127                                      struct cfg80211_bss *cbss,
2128                                      u32 bss_info_changed)
2129 {
2130         struct ieee80211_bss *bss = (void *)cbss->priv;
2131         struct ieee80211_local *local = sdata->local;
2132         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2133
2134         bss_info_changed |= BSS_CHANGED_ASSOC;
2135         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
2136                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
2137
2138         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
2139                 beacon_loss_count * bss_conf->beacon_int));
2140
2141         sdata->u.mgd.associated = cbss;
2142         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
2143
2144         ieee80211_check_rate_mask(sdata);
2145
2146         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
2147
2148         if (sdata->vif.p2p ||
2149             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
2150                 const struct cfg80211_bss_ies *ies;
2151
2152                 rcu_read_lock();
2153                 ies = rcu_dereference(cbss->ies);
2154                 if (ies) {
2155                         int ret;
2156
2157                         ret = cfg80211_get_p2p_attr(
2158                                         ies->data, ies->len,
2159                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2160                                         (u8 *) &bss_conf->p2p_noa_attr,
2161                                         sizeof(bss_conf->p2p_noa_attr));
2162                         if (ret >= 2) {
2163                                 sdata->u.mgd.p2p_noa_index =
2164                                         bss_conf->p2p_noa_attr.index;
2165                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
2166                         }
2167                 }
2168                 rcu_read_unlock();
2169         }
2170
2171         /* just to be sure */
2172         ieee80211_stop_poll(sdata);
2173
2174         ieee80211_led_assoc(local, 1);
2175
2176         if (sdata->u.mgd.have_beacon) {
2177                 /*
2178                  * If the AP is buggy we may get here with no DTIM period
2179                  * known, so assume it's 1 which is the only safe assumption
2180                  * in that case, although if the TIM IE is broken powersave
2181                  * probably just won't work at all.
2182                  */
2183                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
2184                 bss_conf->beacon_rate = bss->beacon_rate;
2185                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
2186         } else {
2187                 bss_conf->beacon_rate = NULL;
2188                 bss_conf->dtim_period = 0;
2189         }
2190
2191         bss_conf->assoc = 1;
2192
2193         /* Tell the driver to monitor connection quality (if supported) */
2194         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
2195             bss_conf->cqm_rssi_thold)
2196                 bss_info_changed |= BSS_CHANGED_CQM;
2197
2198         /* Enable ARP filtering */
2199         if (bss_conf->arp_addr_cnt)
2200                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
2201
2202         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
2203
2204         mutex_lock(&local->iflist_mtx);
2205         ieee80211_recalc_ps(local);
2206         mutex_unlock(&local->iflist_mtx);
2207
2208         ieee80211_recalc_smps(sdata);
2209         ieee80211_recalc_ps_vif(sdata);
2210
2211         netif_carrier_on(sdata->dev);
2212 }
2213
2214 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2215                                    u16 stype, u16 reason, bool tx,
2216                                    u8 *frame_buf)
2217 {
2218         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2219         struct ieee80211_local *local = sdata->local;
2220         u32 changed = 0;
2221
2222         sdata_assert_lock(sdata);
2223
2224         if (WARN_ON_ONCE(tx && !frame_buf))
2225                 return;
2226
2227         if (WARN_ON(!ifmgd->associated))
2228                 return;
2229
2230         ieee80211_stop_poll(sdata);
2231
2232         ifmgd->associated = NULL;
2233         netif_carrier_off(sdata->dev);
2234
2235         /*
2236          * if we want to get out of ps before disassoc (why?) we have
2237          * to do it before sending disassoc, as otherwise the null-packet
2238          * won't be valid.
2239          */
2240         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2241                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2242                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2243         }
2244         local->ps_sdata = NULL;
2245
2246         /* disable per-vif ps */
2247         ieee80211_recalc_ps_vif(sdata);
2248
2249         /* make sure ongoing transmission finishes */
2250         synchronize_net();
2251
2252         /*
2253          * drop any frame before deauth/disassoc, this can be data or
2254          * management frame. Since we are disconnecting, we should not
2255          * insist sending these frames which can take time and delay
2256          * the disconnection and possible the roaming.
2257          */
2258         if (tx)
2259                 ieee80211_flush_queues(local, sdata, true);
2260
2261         /* deauthenticate/disassociate now */
2262         if (tx || frame_buf) {
2263                 /*
2264                  * In multi channel scenarios guarantee that the virtual
2265                  * interface is granted immediate airtime to transmit the
2266                  * deauthentication frame by calling mgd_prepare_tx, if the
2267                  * driver requested so.
2268                  */
2269                 if (ieee80211_hw_check(&local->hw, DEAUTH_NEED_MGD_TX_PREP) &&
2270                     !ifmgd->have_beacon)
2271                         drv_mgd_prepare_tx(sdata->local, sdata, 0);
2272
2273                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2274                                                reason, tx, frame_buf);
2275         }
2276
2277         /* flush out frame - make sure the deauth was actually sent */
2278         if (tx)
2279                 ieee80211_flush_queues(local, sdata, false);
2280
2281         /* clear bssid only after building the needed mgmt frames */
2282         eth_zero_addr(ifmgd->bssid);
2283
2284         /* remove AP and TDLS peers */
2285         sta_info_flush(sdata);
2286
2287         /* finally reset all BSS / config parameters */
2288         changed |= ieee80211_reset_erp_info(sdata);
2289
2290         ieee80211_led_assoc(local, 0);
2291         changed |= BSS_CHANGED_ASSOC;
2292         sdata->vif.bss_conf.assoc = false;
2293
2294         ifmgd->p2p_noa_index = -1;
2295         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2296                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2297
2298         /* on the next assoc, re-program HT/VHT parameters */
2299         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2300         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2301         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2302         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2303
2304         /* reset MU-MIMO ownership and group data */
2305         memset(sdata->vif.bss_conf.mu_group.membership, 0,
2306                sizeof(sdata->vif.bss_conf.mu_group.membership));
2307         memset(sdata->vif.bss_conf.mu_group.position, 0,
2308                sizeof(sdata->vif.bss_conf.mu_group.position));
2309         changed |= BSS_CHANGED_MU_GROUPS;
2310         sdata->vif.mu_mimo_owner = false;
2311
2312         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2313
2314         del_timer_sync(&local->dynamic_ps_timer);
2315         cancel_work_sync(&local->dynamic_ps_enable_work);
2316
2317         /* Disable ARP filtering */
2318         if (sdata->vif.bss_conf.arp_addr_cnt)
2319                 changed |= BSS_CHANGED_ARP_FILTER;
2320
2321         sdata->vif.bss_conf.qos = false;
2322         changed |= BSS_CHANGED_QOS;
2323
2324         /* The BSSID (not really interesting) and HT changed */
2325         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2326         ieee80211_bss_info_change_notify(sdata, changed);
2327
2328         /* disassociated - set to defaults now */
2329         ieee80211_set_wmm_default(sdata, false, false);
2330
2331         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2332         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2333         del_timer_sync(&sdata->u.mgd.timer);
2334         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2335
2336         sdata->vif.bss_conf.dtim_period = 0;
2337         sdata->vif.bss_conf.beacon_rate = NULL;
2338
2339         ifmgd->have_beacon = false;
2340
2341         ifmgd->flags = 0;
2342         mutex_lock(&local->mtx);
2343         ieee80211_vif_release_channel(sdata);
2344
2345         sdata->vif.csa_active = false;
2346         ifmgd->csa_waiting_bcn = false;
2347         ifmgd->csa_ignored_same_chan = false;
2348         if (sdata->csa_block_tx) {
2349                 ieee80211_wake_vif_queues(local, sdata,
2350                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2351                 sdata->csa_block_tx = false;
2352         }
2353         mutex_unlock(&local->mtx);
2354
2355         /* existing TX TSPEC sessions no longer exist */
2356         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2357         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2358
2359         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2360 }
2361
2362 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2363                              struct ieee80211_hdr *hdr)
2364 {
2365         /*
2366          * We can postpone the mgd.timer whenever receiving unicast frames
2367          * from AP because we know that the connection is working both ways
2368          * at that time. But multicast frames (and hence also beacons) must
2369          * be ignored here, because we need to trigger the timer during
2370          * data idle periods for sending the periodic probe request to the
2371          * AP we're connected to.
2372          */
2373         if (is_multicast_ether_addr(hdr->addr1))
2374                 return;
2375
2376         ieee80211_sta_reset_conn_monitor(sdata);
2377 }
2378
2379 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2380 {
2381         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2382         struct ieee80211_local *local = sdata->local;
2383
2384         mutex_lock(&local->mtx);
2385         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2386                 goto out;
2387
2388         __ieee80211_stop_poll(sdata);
2389
2390         mutex_lock(&local->iflist_mtx);
2391         ieee80211_recalc_ps(local);
2392         mutex_unlock(&local->iflist_mtx);
2393
2394         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2395                 goto out;
2396
2397         /*
2398          * We've received a probe response, but are not sure whether
2399          * we have or will be receiving any beacons or data, so let's
2400          * schedule the timers again, just in case.
2401          */
2402         ieee80211_sta_reset_beacon_monitor(sdata);
2403
2404         mod_timer(&ifmgd->conn_mon_timer,
2405                   round_jiffies_up(jiffies +
2406                                    IEEE80211_CONNECTION_IDLE_TIME));
2407 out:
2408         mutex_unlock(&local->mtx);
2409 }
2410
2411 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2412                                            struct ieee80211_hdr *hdr,
2413                                            u16 tx_time)
2414 {
2415         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2416         u16 tid = ieee80211_get_tid(hdr);
2417         int ac = ieee80211_ac_from_tid(tid);
2418         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2419         unsigned long now = jiffies;
2420
2421         if (likely(!tx_tspec->admitted_time))
2422                 return;
2423
2424         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2425                 tx_tspec->consumed_tx_time = 0;
2426                 tx_tspec->time_slice_start = now;
2427
2428                 if (tx_tspec->downgraded) {
2429                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2430                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2431                 }
2432         }
2433
2434         if (tx_tspec->downgraded)
2435                 return;
2436
2437         tx_tspec->consumed_tx_time += tx_time;
2438
2439         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2440                 tx_tspec->downgraded = true;
2441                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2442                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2443         }
2444 }
2445
2446 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2447                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2448 {
2449         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2450
2451         if (!ieee80211_is_data(hdr->frame_control))
2452             return;
2453
2454         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2455             sdata->u.mgd.probe_send_count > 0) {
2456                 if (ack)
2457                         ieee80211_sta_reset_conn_monitor(sdata);
2458                 else
2459                         sdata->u.mgd.nullfunc_failed = true;
2460                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2461                 return;
2462         }
2463
2464         if (ack)
2465                 ieee80211_sta_reset_conn_monitor(sdata);
2466 }
2467
2468 static void ieee80211_mlme_send_probe_req(struct ieee80211_sub_if_data *sdata,
2469                                           const u8 *src, const u8 *dst,
2470                                           const u8 *ssid, size_t ssid_len,
2471                                           struct ieee80211_channel *channel)
2472 {
2473         struct sk_buff *skb;
2474
2475         skb = ieee80211_build_probe_req(sdata, src, dst, (u32)-1, channel,
2476                                         ssid, ssid_len, NULL, 0,
2477                                         IEEE80211_PROBE_FLAG_DIRECTED);
2478         if (skb)
2479                 ieee80211_tx_skb(sdata, skb);
2480 }
2481
2482 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2483 {
2484         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2485         const u8 *ssid;
2486         u8 *dst = ifmgd->associated->bssid;
2487         u8 unicast_limit = max(1, max_probe_tries - 3);
2488         struct sta_info *sta;
2489
2490         /*
2491          * Try sending broadcast probe requests for the last three
2492          * probe requests after the first ones failed since some
2493          * buggy APs only support broadcast probe requests.
2494          */
2495         if (ifmgd->probe_send_count >= unicast_limit)
2496                 dst = NULL;
2497
2498         /*
2499          * When the hardware reports an accurate Tx ACK status, it's
2500          * better to send a nullfunc frame instead of a probe request,
2501          * as it will kick us off the AP quickly if we aren't associated
2502          * anymore. The timeout will be reset if the frame is ACKed by
2503          * the AP.
2504          */
2505         ifmgd->probe_send_count++;
2506
2507         if (dst) {
2508                 mutex_lock(&sdata->local->sta_mtx);
2509                 sta = sta_info_get(sdata, dst);
2510                 if (!WARN_ON(!sta))
2511                         ieee80211_check_fast_rx(sta);
2512                 mutex_unlock(&sdata->local->sta_mtx);
2513         }
2514
2515         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2516                 ifmgd->nullfunc_failed = false;
2517                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2518         } else {
2519                 int ssid_len;
2520
2521                 rcu_read_lock();
2522                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2523                 if (WARN_ON_ONCE(ssid == NULL))
2524                         ssid_len = 0;
2525                 else
2526                         ssid_len = ssid[1];
2527
2528                 ieee80211_mlme_send_probe_req(sdata, sdata->vif.addr, dst,
2529                                               ssid + 2, ssid_len,
2530                                               ifmgd->associated->channel);
2531                 rcu_read_unlock();
2532         }
2533
2534         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2535         run_again(sdata, ifmgd->probe_timeout);
2536 }
2537
2538 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2539                                    bool beacon)
2540 {
2541         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2542         bool already = false;
2543
2544         if (!ieee80211_sdata_running(sdata))
2545                 return;
2546
2547         sdata_lock(sdata);
2548
2549         if (!ifmgd->associated)
2550                 goto out;
2551
2552         mutex_lock(&sdata->local->mtx);
2553
2554         if (sdata->local->tmp_channel || sdata->local->scanning) {
2555                 mutex_unlock(&sdata->local->mtx);
2556                 goto out;
2557         }
2558
2559         if (beacon) {
2560                 mlme_dbg_ratelimited(sdata,
2561                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2562                                      beacon_loss_count);
2563
2564                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2565         }
2566
2567         /*
2568          * The driver/our work has already reported this event or the
2569          * connection monitoring has kicked in and we have already sent
2570          * a probe request. Or maybe the AP died and the driver keeps
2571          * reporting until we disassociate...
2572          *
2573          * In either case we have to ignore the current call to this
2574          * function (except for setting the correct probe reason bit)
2575          * because otherwise we would reset the timer every time and
2576          * never check whether we received a probe response!
2577          */
2578         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2579                 already = true;
2580
2581         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2582
2583         mutex_unlock(&sdata->local->mtx);
2584
2585         if (already)
2586                 goto out;
2587
2588         mutex_lock(&sdata->local->iflist_mtx);
2589         ieee80211_recalc_ps(sdata->local);
2590         mutex_unlock(&sdata->local->iflist_mtx);
2591
2592         ifmgd->probe_send_count = 0;
2593         ieee80211_mgd_probe_ap_send(sdata);
2594  out:
2595         sdata_unlock(sdata);
2596 }
2597
2598 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2599                                           struct ieee80211_vif *vif)
2600 {
2601         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2602         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2603         struct cfg80211_bss *cbss;
2604         struct sk_buff *skb;
2605         const u8 *ssid;
2606         int ssid_len;
2607
2608         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2609                 return NULL;
2610
2611         sdata_assert_lock(sdata);
2612
2613         if (ifmgd->associated)
2614                 cbss = ifmgd->associated;
2615         else if (ifmgd->auth_data)
2616                 cbss = ifmgd->auth_data->bss;
2617         else if (ifmgd->assoc_data)
2618                 cbss = ifmgd->assoc_data->bss;
2619         else
2620                 return NULL;
2621
2622         rcu_read_lock();
2623         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2624         if (WARN_ON_ONCE(ssid == NULL))
2625                 ssid_len = 0;
2626         else
2627                 ssid_len = ssid[1];
2628
2629         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2630                                         (u32) -1, cbss->channel,
2631                                         ssid + 2, ssid_len,
2632                                         NULL, 0, IEEE80211_PROBE_FLAG_DIRECTED);
2633         rcu_read_unlock();
2634
2635         return skb;
2636 }
2637 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2638
2639 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2640                                         const u8 *buf, size_t len, bool tx,
2641                                         u16 reason)
2642 {
2643         struct ieee80211_event event = {
2644                 .type = MLME_EVENT,
2645                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2646                 .u.mlme.reason = reason,
2647         };
2648
2649         if (tx)
2650                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2651         else
2652                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2653
2654         drv_event_callback(sdata->local, sdata, &event);
2655 }
2656
2657 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2658 {
2659         struct ieee80211_local *local = sdata->local;
2660         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2661         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2662         bool tx;
2663
2664         sdata_lock(sdata);
2665         if (!ifmgd->associated) {
2666                 sdata_unlock(sdata);
2667                 return;
2668         }
2669
2670         tx = !sdata->csa_block_tx;
2671
2672         /* AP is probably out of range (or not reachable for another reason) so
2673          * remove the bss struct for that AP.
2674          */
2675         cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2676
2677         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2678                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2679                                tx, frame_buf);
2680         mutex_lock(&local->mtx);
2681         sdata->vif.csa_active = false;
2682         ifmgd->csa_waiting_bcn = false;
2683         if (sdata->csa_block_tx) {
2684                 ieee80211_wake_vif_queues(local, sdata,
2685                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2686                 sdata->csa_block_tx = false;
2687         }
2688         mutex_unlock(&local->mtx);
2689
2690         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), tx,
2691                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2692
2693         sdata_unlock(sdata);
2694 }
2695
2696 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2697 {
2698         struct ieee80211_sub_if_data *sdata =
2699                 container_of(work, struct ieee80211_sub_if_data,
2700                              u.mgd.beacon_connection_loss_work);
2701         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2702
2703         if (ifmgd->associated)
2704                 ifmgd->beacon_loss_count++;
2705
2706         if (ifmgd->connection_loss) {
2707                 sdata_info(sdata, "Connection to AP %pM lost\n",
2708                            ifmgd->bssid);
2709                 __ieee80211_disconnect(sdata);
2710         } else {
2711                 ieee80211_mgd_probe_ap(sdata, true);
2712         }
2713 }
2714
2715 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2716 {
2717         struct ieee80211_sub_if_data *sdata =
2718                 container_of(work, struct ieee80211_sub_if_data,
2719                              u.mgd.csa_connection_drop_work);
2720
2721         __ieee80211_disconnect(sdata);
2722 }
2723
2724 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2725 {
2726         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2727         struct ieee80211_hw *hw = &sdata->local->hw;
2728
2729         trace_api_beacon_loss(sdata);
2730
2731         sdata->u.mgd.connection_loss = false;
2732         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2733 }
2734 EXPORT_SYMBOL(ieee80211_beacon_loss);
2735
2736 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2737 {
2738         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2739         struct ieee80211_hw *hw = &sdata->local->hw;
2740
2741         trace_api_connection_loss(sdata);
2742
2743         sdata->u.mgd.connection_loss = true;
2744         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2745 }
2746 EXPORT_SYMBOL(ieee80211_connection_loss);
2747
2748
2749 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2750                                         bool assoc)
2751 {
2752         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2753
2754         sdata_assert_lock(sdata);
2755
2756         if (!assoc) {
2757                 /*
2758                  * we are not authenticated yet, the only timer that could be
2759                  * running is the timeout for the authentication response which
2760                  * which is not relevant anymore.
2761                  */
2762                 del_timer_sync(&sdata->u.mgd.timer);
2763                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2764
2765                 eth_zero_addr(sdata->u.mgd.bssid);
2766                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2767                 sdata->u.mgd.flags = 0;
2768                 mutex_lock(&sdata->local->mtx);
2769                 ieee80211_vif_release_channel(sdata);
2770                 mutex_unlock(&sdata->local->mtx);
2771         }
2772
2773         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2774         kfree(auth_data);
2775         sdata->u.mgd.auth_data = NULL;
2776 }
2777
2778 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2779                                          bool assoc, bool abandon)
2780 {
2781         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2782
2783         sdata_assert_lock(sdata);
2784
2785         if (!assoc) {
2786                 /*
2787                  * we are not associated yet, the only timer that could be
2788                  * running is the timeout for the association response which
2789                  * which is not relevant anymore.
2790                  */
2791                 del_timer_sync(&sdata->u.mgd.timer);
2792                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2793
2794                 eth_zero_addr(sdata->u.mgd.bssid);
2795                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2796                 sdata->u.mgd.flags = 0;
2797                 sdata->vif.mu_mimo_owner = false;
2798
2799                 mutex_lock(&sdata->local->mtx);
2800                 ieee80211_vif_release_channel(sdata);
2801                 mutex_unlock(&sdata->local->mtx);
2802
2803                 if (abandon)
2804                         cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2805         }
2806
2807         kfree(assoc_data);
2808         sdata->u.mgd.assoc_data = NULL;
2809 }
2810
2811 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2812                                      struct ieee80211_mgmt *mgmt, size_t len)
2813 {
2814         struct ieee80211_local *local = sdata->local;
2815         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2816         u8 *pos;
2817         struct ieee802_11_elems elems;
2818         u32 tx_flags = 0;
2819
2820         pos = mgmt->u.auth.variable;
2821         ieee802_11_parse_elems(pos, len - (pos - (u8 *)mgmt), false, &elems,
2822                                mgmt->bssid, auth_data->bss->bssid);
2823         if (!elems.challenge)
2824                 return;
2825         auth_data->expected_transaction = 4;
2826         drv_mgd_prepare_tx(sdata->local, sdata, 0);
2827         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2828                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2829                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2830         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2831                             elems.challenge - 2, elems.challenge_len + 2,
2832                             auth_data->bss->bssid, auth_data->bss->bssid,
2833                             auth_data->key, auth_data->key_len,
2834                             auth_data->key_idx, tx_flags);
2835 }
2836
2837 static bool ieee80211_mark_sta_auth(struct ieee80211_sub_if_data *sdata,
2838                                     const u8 *bssid)
2839 {
2840         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2841         struct sta_info *sta;
2842         bool result = true;
2843
2844         sdata_info(sdata, "authenticated\n");
2845         ifmgd->auth_data->done = true;
2846         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2847         ifmgd->auth_data->timeout_started = true;
2848         run_again(sdata, ifmgd->auth_data->timeout);
2849
2850         /* move station state to auth */
2851         mutex_lock(&sdata->local->sta_mtx);
2852         sta = sta_info_get(sdata, bssid);
2853         if (!sta) {
2854                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2855                 result = false;
2856                 goto out;
2857         }
2858         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2859                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2860                 result = false;
2861                 goto out;
2862         }
2863
2864 out:
2865         mutex_unlock(&sdata->local->sta_mtx);
2866         return result;
2867 }
2868
2869 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2870                                    struct ieee80211_mgmt *mgmt, size_t len)
2871 {
2872         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2873         u8 bssid[ETH_ALEN];
2874         u16 auth_alg, auth_transaction, status_code;
2875         struct ieee80211_event event = {
2876                 .type = MLME_EVENT,
2877                 .u.mlme.data = AUTH_EVENT,
2878         };
2879
2880         sdata_assert_lock(sdata);
2881
2882         if (len < 24 + 6)
2883                 return;
2884
2885         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2886                 return;
2887
2888         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2889
2890         if (!ether_addr_equal(bssid, mgmt->bssid))
2891                 return;
2892
2893         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2894         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2895         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2896
2897         if (auth_alg != ifmgd->auth_data->algorithm ||
2898             (auth_alg != WLAN_AUTH_SAE &&
2899              auth_transaction != ifmgd->auth_data->expected_transaction) ||
2900             (auth_alg == WLAN_AUTH_SAE &&
2901              (auth_transaction < ifmgd->auth_data->expected_transaction ||
2902               auth_transaction > 2))) {
2903                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2904                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2905                            auth_transaction,
2906                            ifmgd->auth_data->expected_transaction);
2907                 return;
2908         }
2909
2910         if (status_code != WLAN_STATUS_SUCCESS) {
2911                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2912                            mgmt->sa, status_code);
2913                 ieee80211_destroy_auth_data(sdata, false);
2914                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2915                 event.u.mlme.status = MLME_DENIED;
2916                 event.u.mlme.reason = status_code;
2917                 drv_event_callback(sdata->local, sdata, &event);
2918                 return;
2919         }
2920
2921         switch (ifmgd->auth_data->algorithm) {
2922         case WLAN_AUTH_OPEN:
2923         case WLAN_AUTH_LEAP:
2924         case WLAN_AUTH_FT:
2925         case WLAN_AUTH_SAE:
2926         case WLAN_AUTH_FILS_SK:
2927         case WLAN_AUTH_FILS_SK_PFS:
2928         case WLAN_AUTH_FILS_PK:
2929                 break;
2930         case WLAN_AUTH_SHARED_KEY:
2931                 if (ifmgd->auth_data->expected_transaction != 4) {
2932                         ieee80211_auth_challenge(sdata, mgmt, len);
2933                         /* need another frame */
2934                         return;
2935                 }
2936                 break;
2937         default:
2938                 WARN_ONCE(1, "invalid auth alg %d",
2939                           ifmgd->auth_data->algorithm);
2940                 return;
2941         }
2942
2943         event.u.mlme.status = MLME_SUCCESS;
2944         drv_event_callback(sdata->local, sdata, &event);
2945         if (ifmgd->auth_data->algorithm != WLAN_AUTH_SAE ||
2946             (auth_transaction == 2 &&
2947              ifmgd->auth_data->expected_transaction == 2)) {
2948                 if (!ieee80211_mark_sta_auth(sdata, bssid))
2949                         goto out_err;
2950         } else if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2951                    auth_transaction == 2) {
2952                 sdata_info(sdata, "SAE peer confirmed\n");
2953                 ifmgd->auth_data->peer_confirmed = true;
2954         }
2955
2956         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2957         return;
2958  out_err:
2959         mutex_unlock(&sdata->local->sta_mtx);
2960         /* ignore frame -- wait for timeout */
2961 }
2962
2963 #define case_WLAN(type) \
2964         case WLAN_REASON_##type: return #type
2965
2966 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2967 {
2968         switch (reason_code) {
2969         case_WLAN(UNSPECIFIED);
2970         case_WLAN(PREV_AUTH_NOT_VALID);
2971         case_WLAN(DEAUTH_LEAVING);
2972         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2973         case_WLAN(DISASSOC_AP_BUSY);
2974         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2975         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2976         case_WLAN(DISASSOC_STA_HAS_LEFT);
2977         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2978         case_WLAN(DISASSOC_BAD_POWER);
2979         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2980         case_WLAN(INVALID_IE);
2981         case_WLAN(MIC_FAILURE);
2982         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2983         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2984         case_WLAN(IE_DIFFERENT);
2985         case_WLAN(INVALID_GROUP_CIPHER);
2986         case_WLAN(INVALID_PAIRWISE_CIPHER);
2987         case_WLAN(INVALID_AKMP);
2988         case_WLAN(UNSUPP_RSN_VERSION);
2989         case_WLAN(INVALID_RSN_IE_CAP);
2990         case_WLAN(IEEE8021X_FAILED);
2991         case_WLAN(CIPHER_SUITE_REJECTED);
2992         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2993         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2994         case_WLAN(DISASSOC_LOW_ACK);
2995         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2996         case_WLAN(QSTA_LEAVE_QBSS);
2997         case_WLAN(QSTA_NOT_USE);
2998         case_WLAN(QSTA_REQUIRE_SETUP);
2999         case_WLAN(QSTA_TIMEOUT);
3000         case_WLAN(QSTA_CIPHER_NOT_SUPP);
3001         case_WLAN(MESH_PEER_CANCELED);
3002         case_WLAN(MESH_MAX_PEERS);
3003         case_WLAN(MESH_CONFIG);
3004         case_WLAN(MESH_CLOSE);
3005         case_WLAN(MESH_MAX_RETRIES);
3006         case_WLAN(MESH_CONFIRM_TIMEOUT);
3007         case_WLAN(MESH_INVALID_GTK);
3008         case_WLAN(MESH_INCONSISTENT_PARAM);
3009         case_WLAN(MESH_INVALID_SECURITY);
3010         case_WLAN(MESH_PATH_ERROR);
3011         case_WLAN(MESH_PATH_NOFORWARD);
3012         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
3013         case_WLAN(MAC_EXISTS_IN_MBSS);
3014         case_WLAN(MESH_CHAN_REGULATORY);
3015         case_WLAN(MESH_CHAN);
3016         default: return "<unknown>";
3017         }
3018 }
3019
3020 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
3021                                      struct ieee80211_mgmt *mgmt, size_t len)
3022 {
3023         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3024         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
3025
3026         sdata_assert_lock(sdata);
3027
3028         if (len < 24 + 2)
3029                 return;
3030
3031         if (ifmgd->associated &&
3032             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
3033                 const u8 *bssid = ifmgd->associated->bssid;
3034
3035                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
3036                            bssid, reason_code,
3037                            ieee80211_get_reason_code_string(reason_code));
3038
3039                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3040
3041                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
3042                                             reason_code);
3043                 return;
3044         }
3045
3046         if (ifmgd->assoc_data &&
3047             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3048                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
3049
3050                 sdata_info(sdata,
3051                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
3052                            bssid, reason_code,
3053                            ieee80211_get_reason_code_string(reason_code));
3054
3055                 ieee80211_destroy_assoc_data(sdata, false, true);
3056
3057                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
3058                 return;
3059         }
3060 }
3061
3062
3063 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
3064                                        struct ieee80211_mgmt *mgmt, size_t len)
3065 {
3066         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3067         u16 reason_code;
3068
3069         sdata_assert_lock(sdata);
3070
3071         if (len < 24 + 2)
3072                 return;
3073
3074         if (!ifmgd->associated ||
3075             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3076                 return;
3077
3078         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
3079
3080         sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
3081                    mgmt->sa, reason_code,
3082                    ieee80211_get_reason_code_string(reason_code));
3083
3084         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3085
3086         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
3087 }
3088
3089 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
3090                                 u8 *supp_rates, unsigned int supp_rates_len,
3091                                 u32 *rates, u32 *basic_rates,
3092                                 bool *have_higher_than_11mbit,
3093                                 int *min_rate, int *min_rate_index,
3094                                 int shift)
3095 {
3096         int i, j;
3097
3098         for (i = 0; i < supp_rates_len; i++) {
3099                 int rate = supp_rates[i] & 0x7f;
3100                 bool is_basic = !!(supp_rates[i] & 0x80);
3101
3102                 if ((rate * 5 * (1 << shift)) > 110)
3103                         *have_higher_than_11mbit = true;
3104
3105                 /*
3106                  * Skip HT and VHT BSS membership selectors since they're not
3107                  * rates.
3108                  *
3109                  * Note: Even though the membership selector and the basic
3110                  *       rate flag share the same bit, they are not exactly
3111                  *       the same.
3112                  */
3113                 if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) ||
3114                     supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY))
3115                         continue;
3116
3117                 for (j = 0; j < sband->n_bitrates; j++) {
3118                         struct ieee80211_rate *br;
3119                         int brate;
3120
3121                         br = &sband->bitrates[j];
3122
3123                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
3124                         if (brate == rate) {
3125                                 *rates |= BIT(j);
3126                                 if (is_basic)
3127                                         *basic_rates |= BIT(j);
3128                                 if ((rate * 5) < *min_rate) {
3129                                         *min_rate = rate * 5;
3130                                         *min_rate_index = j;
3131                                 }
3132                                 break;
3133                         }
3134                 }
3135         }
3136 }
3137
3138 static bool ieee80211_twt_req_supported(const struct sta_info *sta,
3139                                         const struct ieee802_11_elems *elems)
3140 {
3141         if (elems->ext_capab_len < 10)
3142                 return false;
3143
3144         if (!(elems->ext_capab[9] & WLAN_EXT_CAPA10_TWT_RESPONDER_SUPPORT))
3145                 return false;
3146
3147         return sta->sta.he_cap.he_cap_elem.mac_cap_info[0] &
3148                 IEEE80211_HE_MAC_CAP0_TWT_RES;
3149 }
3150
3151 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
3152                                     struct cfg80211_bss *cbss,
3153                                     struct ieee80211_mgmt *mgmt, size_t len)
3154 {
3155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3156         struct ieee80211_local *local = sdata->local;
3157         struct ieee80211_supported_band *sband;
3158         struct sta_info *sta;
3159         u8 *pos;
3160         u16 capab_info, aid;
3161         struct ieee802_11_elems elems;
3162         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3163         const struct cfg80211_bss_ies *bss_ies = NULL;
3164         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3165         u32 changed = 0;
3166         int err;
3167         bool ret;
3168
3169         /* AssocResp and ReassocResp have identical structure */
3170
3171         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3172         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3173
3174         /*
3175          * The 5 MSB of the AID field are reserved
3176          * (802.11-2016 9.4.1.8 AID field)
3177          */
3178         aid &= 0x7ff;
3179
3180         ifmgd->broken_ap = false;
3181
3182         if (aid == 0 || aid > IEEE80211_MAX_AID) {
3183                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
3184                            aid);
3185                 aid = 0;
3186                 ifmgd->broken_ap = true;
3187         }
3188
3189         pos = mgmt->u.assoc_resp.variable;
3190         ieee802_11_parse_elems(pos, len - (pos - (u8 *)mgmt), false, &elems,
3191                                mgmt->bssid, assoc_data->bss->bssid);
3192
3193         if (!elems.supp_rates) {
3194                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
3195                 return false;
3196         }
3197
3198         ifmgd->aid = aid;
3199         ifmgd->tdls_chan_switch_prohibited =
3200                 elems.ext_capab && elems.ext_capab_len >= 5 &&
3201                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
3202
3203         /*
3204          * Some APs are erroneously not including some information in their
3205          * (re)association response frames. Try to recover by using the data
3206          * from the beacon or probe response. This seems to afflict mobile
3207          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
3208          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
3209          */
3210         if ((assoc_data->wmm && !elems.wmm_param) ||
3211             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3212              (!elems.ht_cap_elem || !elems.ht_operation)) ||
3213             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3214              (!elems.vht_cap_elem || !elems.vht_operation))) {
3215                 const struct cfg80211_bss_ies *ies;
3216                 struct ieee802_11_elems bss_elems;
3217
3218                 rcu_read_lock();
3219                 ies = rcu_dereference(cbss->ies);
3220                 if (ies)
3221                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
3222                                           GFP_ATOMIC);
3223                 rcu_read_unlock();
3224                 if (!bss_ies)
3225                         return false;
3226
3227                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
3228                                        false, &bss_elems,
3229                                        mgmt->bssid,
3230                                        assoc_data->bss->bssid);
3231                 if (assoc_data->wmm &&
3232                     !elems.wmm_param && bss_elems.wmm_param) {
3233                         elems.wmm_param = bss_elems.wmm_param;
3234                         sdata_info(sdata,
3235                                    "AP bug: WMM param missing from AssocResp\n");
3236                 }
3237
3238                 /*
3239                  * Also check if we requested HT/VHT, otherwise the AP doesn't
3240                  * have to include the IEs in the (re)association response.
3241                  */
3242                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
3243                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3244                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
3245                         sdata_info(sdata,
3246                                    "AP bug: HT capability missing from AssocResp\n");
3247                 }
3248                 if (!elems.ht_operation && bss_elems.ht_operation &&
3249                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3250                         elems.ht_operation = bss_elems.ht_operation;
3251                         sdata_info(sdata,
3252                                    "AP bug: HT operation missing from AssocResp\n");
3253                 }
3254                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
3255                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3256                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
3257                         sdata_info(sdata,
3258                                    "AP bug: VHT capa missing from AssocResp\n");
3259                 }
3260                 if (!elems.vht_operation && bss_elems.vht_operation &&
3261                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3262                         elems.vht_operation = bss_elems.vht_operation;
3263                         sdata_info(sdata,
3264                                    "AP bug: VHT operation missing from AssocResp\n");
3265                 }
3266         }
3267
3268         /*
3269          * We previously checked these in the beacon/probe response, so
3270          * they should be present here. This is just a safety net.
3271          */
3272         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3273             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
3274                 sdata_info(sdata,
3275                            "HT AP is missing WMM params or HT capability/operation\n");
3276                 ret = false;
3277                 goto out;
3278         }
3279
3280         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3281             (!elems.vht_cap_elem || !elems.vht_operation)) {
3282                 sdata_info(sdata,
3283                            "VHT AP is missing VHT capability/operation\n");
3284                 ret = false;
3285                 goto out;
3286         }
3287
3288         mutex_lock(&sdata->local->sta_mtx);
3289         /*
3290          * station info was already allocated and inserted before
3291          * the association and should be available to us
3292          */
3293         sta = sta_info_get(sdata, cbss->bssid);
3294         if (WARN_ON(!sta)) {
3295                 mutex_unlock(&sdata->local->sta_mtx);
3296                 ret = false;
3297                 goto out;
3298         }
3299
3300         sband = ieee80211_get_sband(sdata);
3301         if (!sband) {
3302                 mutex_unlock(&sdata->local->sta_mtx);
3303                 ret = false;
3304                 goto out;
3305         }
3306
3307         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE) &&
3308             (!elems.he_cap || !elems.he_operation)) {
3309                 mutex_unlock(&sdata->local->sta_mtx);
3310                 sdata_info(sdata,
3311                            "HE AP is missing HE capability/operation\n");
3312                 ret = false;
3313                 goto out;
3314         }
3315
3316         /* Set up internal HT/VHT capabilities */
3317         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3318                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3319                                                   elems.ht_cap_elem, sta);
3320
3321         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3322                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3323                                                     elems.vht_cap_elem, sta);
3324
3325         if (elems.he_operation && !(ifmgd->flags & IEEE80211_STA_DISABLE_HE) &&
3326             elems.he_cap) {
3327                 ieee80211_he_cap_ie_to_sta_he_cap(sdata, sband,
3328                                                   elems.he_cap,
3329                                                   elems.he_cap_len,
3330                                                   sta);
3331
3332                 bss_conf->he_support = sta->sta.he_cap.has_he;
3333                 bss_conf->twt_requester =
3334                         ieee80211_twt_req_supported(sta, &elems);
3335         } else {
3336                 bss_conf->he_support = false;
3337                 bss_conf->twt_requester = false;
3338         }
3339
3340         if (bss_conf->he_support) {
3341                 bss_conf->bss_color =
3342                         le32_get_bits(elems.he_operation->he_oper_params,
3343                                       IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
3344
3345                 bss_conf->htc_trig_based_pkt_ext =
3346                         le32_get_bits(elems.he_operation->he_oper_params,
3347                               IEEE80211_HE_OPERATION_DFLT_PE_DURATION_MASK);
3348                 bss_conf->frame_time_rts_th =
3349                         le32_get_bits(elems.he_operation->he_oper_params,
3350                               IEEE80211_HE_OPERATION_RTS_THRESHOLD_MASK);
3351
3352                 bss_conf->multi_sta_back_32bit =
3353                         sta->sta.he_cap.he_cap_elem.mac_cap_info[2] &
3354                         IEEE80211_HE_MAC_CAP2_32BIT_BA_BITMAP;
3355
3356                 bss_conf->ack_enabled =
3357                         sta->sta.he_cap.he_cap_elem.mac_cap_info[2] &
3358                         IEEE80211_HE_MAC_CAP2_ACK_EN;
3359
3360                 bss_conf->uora_exists = !!elems.uora_element;
3361                 if (elems.uora_element)
3362                         bss_conf->uora_ocw_range = elems.uora_element[0];
3363
3364                 /* TODO: OPEN: what happens if BSS color disable is set? */
3365         }
3366
3367         if (cbss->transmitted_bss) {
3368                 bss_conf->nontransmitted = true;
3369                 ether_addr_copy(bss_conf->transmitter_bssid,
3370                                 cbss->transmitted_bss->bssid);
3371                 bss_conf->bssid_indicator = cbss->max_bssid_indicator;
3372                 bss_conf->bssid_index = cbss->bssid_index;
3373         }
3374
3375         /*
3376          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3377          * in their association response, so ignore that data for our own
3378          * configuration. If it changed since the last beacon, we'll get the
3379          * next beacon and update then.
3380          */
3381
3382         /*
3383          * If an operating mode notification IE is present, override the
3384          * NSS calculation (that would be done in rate_control_rate_init())
3385          * and use the # of streams from that element.
3386          */
3387         if (elems.opmode_notif &&
3388             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3389                 u8 nss;
3390
3391                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3392                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3393                 nss += 1;
3394                 sta->sta.rx_nss = nss;
3395         }
3396
3397         rate_control_rate_init(sta);
3398
3399         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3400                 set_sta_flag(sta, WLAN_STA_MFP);
3401                 sta->sta.mfp = true;
3402         } else {
3403                 sta->sta.mfp = false;
3404         }
3405
3406         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3407
3408         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3409         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3410                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3411         if (err) {
3412                 sdata_info(sdata,
3413                            "failed to move station %pM to desired state\n",
3414                            sta->sta.addr);
3415                 WARN_ON(__sta_info_destroy(sta));
3416                 mutex_unlock(&sdata->local->sta_mtx);
3417                 ret = false;
3418                 goto out;
3419         }
3420
3421         mutex_unlock(&sdata->local->sta_mtx);
3422
3423         /*
3424          * Always handle WMM once after association regardless
3425          * of the first value the AP uses. Setting -1 here has
3426          * that effect because the AP values is an unsigned
3427          * 4-bit value.
3428          */
3429         ifmgd->wmm_last_param_set = -1;
3430         ifmgd->mu_edca_last_param_set = -1;
3431
3432         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3433                 ieee80211_set_wmm_default(sdata, false, false);
3434         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3435                                              elems.wmm_param_len,
3436                                              elems.mu_edca_param_set)) {
3437                 /* still enable QoS since we might have HT/VHT */
3438                 ieee80211_set_wmm_default(sdata, false, true);
3439                 /* set the disable-WMM flag in this case to disable
3440                  * tracking WMM parameter changes in the beacon if
3441                  * the parameters weren't actually valid. Doing so
3442                  * avoids changing parameters very strangely when
3443                  * the AP is going back and forth between valid and
3444                  * invalid parameters.
3445                  */
3446                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3447         }
3448         changed |= BSS_CHANGED_QOS;
3449
3450         if (elems.max_idle_period_ie) {
3451                 bss_conf->max_idle_period =
3452                         le16_to_cpu(elems.max_idle_period_ie->max_idle_period);
3453                 bss_conf->protected_keep_alive =
3454                         !!(elems.max_idle_period_ie->idle_options &
3455                            WLAN_IDLE_OPTIONS_PROTECTED_KEEP_ALIVE);
3456                 changed |= BSS_CHANGED_KEEP_ALIVE;
3457         } else {
3458                 bss_conf->max_idle_period = 0;
3459                 bss_conf->protected_keep_alive = false;
3460         }
3461
3462         /* set AID and assoc capability,
3463          * ieee80211_set_associated() will tell the driver */
3464         bss_conf->aid = aid;
3465         bss_conf->assoc_capability = capab_info;
3466         ieee80211_set_associated(sdata, cbss, changed);
3467
3468         /*
3469          * If we're using 4-addr mode, let the AP know that we're
3470          * doing so, so that it can create the STA VLAN on its side
3471          */
3472         if (ifmgd->use_4addr)
3473                 ieee80211_send_4addr_nullfunc(local, sdata);
3474
3475         /*
3476          * Start timer to probe the connection to the AP now.
3477          * Also start the timer that will detect beacon loss.
3478          */
3479         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3480         ieee80211_sta_reset_beacon_monitor(sdata);
3481
3482         ret = true;
3483  out:
3484         kfree(bss_ies);
3485         return ret;
3486 }
3487
3488 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3489                                          struct ieee80211_mgmt *mgmt,
3490                                          size_t len)
3491 {
3492         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3493         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3494         u16 capab_info, status_code, aid;
3495         struct ieee802_11_elems elems;
3496         int ac, uapsd_queues = -1;
3497         u8 *pos;
3498         bool reassoc;
3499         struct cfg80211_bss *bss;
3500         struct ieee80211_event event = {
3501                 .type = MLME_EVENT,
3502                 .u.mlme.data = ASSOC_EVENT,
3503         };
3504
3505         sdata_assert_lock(sdata);
3506
3507         if (!assoc_data)
3508                 return;
3509         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3510                 return;
3511
3512         /*
3513          * AssocResp and ReassocResp have identical structure, so process both
3514          * of them in this function.
3515          */
3516
3517         if (len < 24 + 6)
3518                 return;
3519
3520         reassoc = ieee80211_is_reassoc_resp(mgmt->frame_control);
3521         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3522         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3523         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3524
3525         sdata_info(sdata,
3526                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3527                    reassoc ? "Rea" : "A", mgmt->sa,
3528                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3529
3530         if (assoc_data->fils_kek_len &&
3531             fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
3532                 return;
3533
3534         pos = mgmt->u.assoc_resp.variable;
3535         ieee802_11_parse_elems(pos, len - (pos - (u8 *)mgmt), false, &elems,
3536                                mgmt->bssid, assoc_data->bss->bssid);
3537
3538         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3539             elems.timeout_int &&
3540             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3541                 u32 tu, ms;
3542                 tu = le32_to_cpu(elems.timeout_int->value);
3543                 ms = tu * 1024 / 1000;
3544                 sdata_info(sdata,
3545                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3546                            mgmt->sa, tu, ms);
3547                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3548                 assoc_data->timeout_started = true;
3549                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3550                         run_again(sdata, assoc_data->timeout);
3551                 return;
3552         }
3553
3554         bss = assoc_data->bss;
3555
3556         if (status_code != WLAN_STATUS_SUCCESS) {
3557                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3558                            mgmt->sa, status_code);
3559                 ieee80211_destroy_assoc_data(sdata, false, false);
3560                 event.u.mlme.status = MLME_DENIED;
3561                 event.u.mlme.reason = status_code;
3562                 drv_event_callback(sdata->local, sdata, &event);
3563         } else {
3564                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3565                         /* oops -- internal error -- send timeout for now */
3566                         ieee80211_destroy_assoc_data(sdata, false, false);
3567                         cfg80211_assoc_timeout(sdata->dev, bss);
3568                         return;
3569                 }
3570                 event.u.mlme.status = MLME_SUCCESS;
3571                 drv_event_callback(sdata->local, sdata, &event);
3572                 sdata_info(sdata, "associated\n");
3573
3574                 /*
3575                  * destroy assoc_data afterwards, as otherwise an idle
3576                  * recalc after assoc_data is NULL but before associated
3577                  * is set can cause the interface to go idle
3578                  */
3579                 ieee80211_destroy_assoc_data(sdata, true, false);
3580
3581                 /* get uapsd queues configuration */
3582                 uapsd_queues = 0;
3583                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3584                         if (sdata->tx_conf[ac].uapsd)
3585                                 uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
3586         }
3587
3588         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues,
3589                                ifmgd->assoc_req_ies, ifmgd->assoc_req_ies_len);
3590 }
3591
3592 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3593                                   struct ieee80211_mgmt *mgmt, size_t len,
3594                                   struct ieee80211_rx_status *rx_status)
3595 {
3596         struct ieee80211_local *local = sdata->local;
3597         struct ieee80211_bss *bss;
3598         struct ieee80211_channel *channel;
3599
3600         sdata_assert_lock(sdata);
3601
3602         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3603         if (!channel)
3604                 return;
3605
3606         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel);
3607         if (bss) {
3608                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3609                 ieee80211_rx_bss_put(local, bss);
3610         }
3611 }
3612
3613
3614 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3615                                          struct sk_buff *skb)
3616 {
3617         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3618         struct ieee80211_if_managed *ifmgd;
3619         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3620         size_t baselen, len = skb->len;
3621
3622         ifmgd = &sdata->u.mgd;
3623
3624         sdata_assert_lock(sdata);
3625
3626         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3627                 return; /* ignore ProbeResp to foreign address */
3628
3629         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3630         if (baselen > len)
3631                 return;
3632
3633         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status);
3634
3635         if (ifmgd->associated &&
3636             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3637                 ieee80211_reset_ap_probe(sdata);
3638 }
3639
3640 /*
3641  * This is the canonical list of information elements we care about,
3642  * the filter code also gives us all changes to the Microsoft OUI
3643  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3644  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3645  * changes to requested client power.
3646  *
3647  * We implement beacon filtering in software since that means we can
3648  * avoid processing the frame here and in cfg80211, and userspace
3649  * will not be able to tell whether the hardware supports it or not.
3650  *
3651  * XXX: This list needs to be dynamic -- userspace needs to be able to
3652  *      add items it requires. It also needs to be able to tell us to
3653  *      look out for other vendor IEs.
3654  */
3655 static const u64 care_about_ies =
3656         (1ULL << WLAN_EID_COUNTRY) |
3657         (1ULL << WLAN_EID_ERP_INFO) |
3658         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3659         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3660         (1ULL << WLAN_EID_HT_CAPABILITY) |
3661         (1ULL << WLAN_EID_HT_OPERATION) |
3662         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3663
3664 static void ieee80211_handle_beacon_sig(struct ieee80211_sub_if_data *sdata,
3665                                         struct ieee80211_if_managed *ifmgd,
3666                                         struct ieee80211_bss_conf *bss_conf,
3667                                         struct ieee80211_local *local,
3668                                         struct ieee80211_rx_status *rx_status)
3669 {
3670         /* Track average RSSI from the Beacon frames of the current AP */
3671
3672         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3673                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3674                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3675                 ifmgd->last_cqm_event_signal = 0;
3676                 ifmgd->count_beacon_signal = 1;
3677                 ifmgd->last_ave_beacon_signal = 0;
3678         } else {
3679                 ifmgd->count_beacon_signal++;
3680         }
3681
3682         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3683
3684         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3685             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3686                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3687                 int last_sig = ifmgd->last_ave_beacon_signal;
3688                 struct ieee80211_event event = {
3689                         .type = RSSI_EVENT,
3690                 };
3691
3692                 /*
3693                  * if signal crosses either of the boundaries, invoke callback
3694                  * with appropriate parameters
3695                  */
3696                 if (sig > ifmgd->rssi_max_thold &&
3697                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3698                         ifmgd->last_ave_beacon_signal = sig;
3699                         event.u.rssi.data = RSSI_EVENT_HIGH;
3700                         drv_event_callback(local, sdata, &event);
3701                 } else if (sig < ifmgd->rssi_min_thold &&
3702                            (last_sig >= ifmgd->rssi_max_thold ||
3703                            last_sig == 0)) {
3704                         ifmgd->last_ave_beacon_signal = sig;
3705                         event.u.rssi.data = RSSI_EVENT_LOW;
3706                         drv_event_callback(local, sdata, &event);
3707                 }
3708         }
3709
3710         if (bss_conf->cqm_rssi_thold &&
3711             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3712             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3713                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3714                 int last_event = ifmgd->last_cqm_event_signal;
3715                 int thold = bss_conf->cqm_rssi_thold;
3716                 int hyst = bss_conf->cqm_rssi_hyst;
3717
3718                 if (sig < thold &&
3719                     (last_event == 0 || sig < last_event - hyst)) {
3720                         ifmgd->last_cqm_event_signal = sig;
3721                         ieee80211_cqm_rssi_notify(
3722                                 &sdata->vif,
3723                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3724                                 sig, GFP_KERNEL);
3725                 } else if (sig > thold &&
3726                            (last_event == 0 || sig > last_event + hyst)) {
3727                         ifmgd->last_cqm_event_signal = sig;
3728                         ieee80211_cqm_rssi_notify(
3729                                 &sdata->vif,
3730                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3731                                 sig, GFP_KERNEL);
3732                 }
3733         }
3734
3735         if (bss_conf->cqm_rssi_low &&
3736             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3737                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3738                 int last_event = ifmgd->last_cqm_event_signal;
3739                 int low = bss_conf->cqm_rssi_low;
3740                 int high = bss_conf->cqm_rssi_high;
3741
3742                 if (sig < low &&
3743                     (last_event == 0 || last_event >= low)) {
3744                         ifmgd->last_cqm_event_signal = sig;
3745                         ieee80211_cqm_rssi_notify(
3746                                 &sdata->vif,
3747                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3748                                 sig, GFP_KERNEL);
3749                 } else if (sig > high &&
3750                            (last_event == 0 || last_event <= high)) {
3751                         ifmgd->last_cqm_event_signal = sig;
3752                         ieee80211_cqm_rssi_notify(
3753                                 &sdata->vif,
3754                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3755                                 sig, GFP_KERNEL);
3756                 }
3757         }
3758 }
3759
3760 static bool ieee80211_rx_our_beacon(const u8 *tx_bssid,
3761                                     struct cfg80211_bss *bss)
3762 {
3763         if (ether_addr_equal(tx_bssid, bss->bssid))
3764                 return true;
3765         if (!bss->transmitted_bss)
3766                 return false;
3767         return ether_addr_equal(tx_bssid, bss->transmitted_bss->bssid);
3768 }
3769
3770 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3771                                      struct ieee80211_mgmt *mgmt, size_t len,
3772                                      struct ieee80211_rx_status *rx_status)
3773 {
3774         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3775         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3776         size_t baselen;
3777         struct ieee802_11_elems elems;
3778         struct ieee80211_local *local = sdata->local;
3779         struct ieee80211_chanctx_conf *chanctx_conf;
3780         struct ieee80211_channel *chan;
3781         struct sta_info *sta;
3782         u32 changed = 0;
3783         bool erp_valid;
3784         u8 erp_value = 0;
3785         u32 ncrc;
3786         u8 *bssid;
3787         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3788
3789         sdata_assert_lock(sdata);
3790
3791         /* Process beacon from the current BSS */
3792         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3793         if (baselen > len)
3794                 return;
3795
3796         rcu_read_lock();
3797         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3798         if (!chanctx_conf) {
3799                 rcu_read_unlock();
3800                 return;
3801         }
3802
3803         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3804                 rcu_read_unlock();
3805                 return;
3806         }
3807         chan = chanctx_conf->def.chan;
3808         rcu_read_unlock();
3809
3810         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3811             ieee80211_rx_our_beacon(mgmt->bssid, ifmgd->assoc_data->bss)) {
3812                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3813                                        len - baselen, false, &elems,
3814                                        mgmt->bssid,
3815                                        ifmgd->assoc_data->bss->bssid);
3816
3817                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status);
3818
3819                 if (elems.dtim_period)
3820                         ifmgd->dtim_period = elems.dtim_period;
3821                 ifmgd->have_beacon = true;
3822                 ifmgd->assoc_data->need_beacon = false;
3823                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3824                         sdata->vif.bss_conf.sync_tsf =
3825                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3826                         sdata->vif.bss_conf.sync_device_ts =
3827                                 rx_status->device_timestamp;
3828                         sdata->vif.bss_conf.sync_dtim_count = elems.dtim_count;
3829                 }
3830
3831                 if (elems.mbssid_config_ie)
3832                         bss_conf->profile_periodicity =
3833                                 elems.mbssid_config_ie->profile_periodicity;
3834
3835                 if (elems.ext_capab_len >= 11 &&
3836                     (elems.ext_capab[10] & WLAN_EXT_CAPA11_EMA_SUPPORT))
3837                         bss_conf->ema_ap = true;
3838
3839                 /* continue assoc process */
3840                 ifmgd->assoc_data->timeout = jiffies;
3841                 ifmgd->assoc_data->timeout_started = true;
3842                 run_again(sdata, ifmgd->assoc_data->timeout);
3843                 return;
3844         }
3845
3846         if (!ifmgd->associated ||
3847             !ieee80211_rx_our_beacon(mgmt->bssid,  ifmgd->associated))
3848                 return;
3849         bssid = ifmgd->associated->bssid;
3850
3851         if (!(rx_status->flag & RX_FLAG_NO_SIGNAL_VAL))
3852                 ieee80211_handle_beacon_sig(sdata, ifmgd, bss_conf,
3853                                             local, rx_status);
3854
3855         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3856                 mlme_dbg_ratelimited(sdata,
3857                                      "cancelling AP probe due to a received beacon\n");
3858                 ieee80211_reset_ap_probe(sdata);
3859         }
3860
3861         /*
3862          * Push the beacon loss detection into the future since
3863          * we are processing a beacon from the AP just now.
3864          */
3865         ieee80211_sta_reset_beacon_monitor(sdata);
3866
3867         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3868         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3869                                           len - baselen, false, &elems,
3870                                           care_about_ies, ncrc,
3871                                           mgmt->bssid, bssid);
3872
3873         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3874             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3875                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3876                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3877                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3878                                 ieee80211_hw_config(local,
3879                                                     IEEE80211_CONF_CHANGE_PS);
3880                         }
3881                         ieee80211_send_nullfunc(local, sdata, false);
3882                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3883                         local->pspolling = true;
3884
3885                         /*
3886                          * Here is assumed that the driver will be
3887                          * able to send ps-poll frame and receive a
3888                          * response even though power save mode is
3889                          * enabled, but some drivers might require
3890                          * to disable power save here. This needs
3891                          * to be investigated.
3892                          */
3893                         ieee80211_send_pspoll(local, sdata);
3894                 }
3895         }
3896
3897         if (sdata->vif.p2p ||
3898             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3899                 struct ieee80211_p2p_noa_attr noa = {};
3900                 int ret;
3901
3902                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3903                                             len - baselen,
3904                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3905                                             (u8 *) &noa, sizeof(noa));
3906                 if (ret >= 2) {
3907                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3908                                 /* valid noa_attr and index changed */
3909                                 sdata->u.mgd.p2p_noa_index = noa.index;
3910                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3911                                 changed |= BSS_CHANGED_P2P_PS;
3912                                 /*
3913                                  * make sure we update all information, the CRC
3914                                  * mechanism doesn't look at P2P attributes.
3915                                  */
3916                                 ifmgd->beacon_crc_valid = false;
3917                         }
3918                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3919                         /* noa_attr not found and we had valid noa_attr before */
3920                         sdata->u.mgd.p2p_noa_index = -1;
3921                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3922                         changed |= BSS_CHANGED_P2P_PS;
3923                         ifmgd->beacon_crc_valid = false;
3924                 }
3925         }
3926
3927         if (ifmgd->csa_waiting_bcn)
3928                 ieee80211_chswitch_post_beacon(sdata);
3929
3930         /*
3931          * Update beacon timing and dtim count on every beacon appearance. This
3932          * will allow the driver to use the most updated values. Do it before
3933          * comparing this one with last received beacon.
3934          * IMPORTANT: These parameters would possibly be out of sync by the time
3935          * the driver will use them. The synchronized view is currently
3936          * guaranteed only in certain callbacks.
3937          */
3938         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3939                 sdata->vif.bss_conf.sync_tsf =
3940                         le64_to_cpu(mgmt->u.beacon.timestamp);
3941                 sdata->vif.bss_conf.sync_device_ts =
3942                         rx_status->device_timestamp;
3943                 sdata->vif.bss_conf.sync_dtim_count = elems.dtim_count;
3944         }
3945
3946         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3947                 return;
3948         ifmgd->beacon_crc = ncrc;
3949         ifmgd->beacon_crc_valid = true;
3950
3951         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status);
3952
3953         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3954                                          rx_status->device_timestamp,
3955                                          &elems, true);
3956
3957         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3958             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3959                                      elems.wmm_param_len,
3960                                      elems.mu_edca_param_set))
3961                 changed |= BSS_CHANGED_QOS;
3962
3963         /*
3964          * If we haven't had a beacon before, tell the driver about the
3965          * DTIM period (and beacon timing if desired) now.
3966          */
3967         if (!ifmgd->have_beacon) {
3968                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3969                 bss_conf->dtim_period = elems.dtim_period ?: 1;
3970
3971                 changed |= BSS_CHANGED_BEACON_INFO;
3972                 ifmgd->have_beacon = true;
3973
3974                 mutex_lock(&local->iflist_mtx);
3975                 ieee80211_recalc_ps(local);
3976                 mutex_unlock(&local->iflist_mtx);
3977
3978                 ieee80211_recalc_ps_vif(sdata);
3979         }
3980
3981         if (elems.erp_info) {
3982                 erp_valid = true;
3983                 erp_value = elems.erp_info[0];
3984         } else {
3985                 erp_valid = false;
3986         }
3987         changed |= ieee80211_handle_bss_capability(sdata,
3988                         le16_to_cpu(mgmt->u.beacon.capab_info),
3989                         erp_valid, erp_value);
3990
3991         mutex_lock(&local->sta_mtx);
3992         sta = sta_info_get(sdata, bssid);
3993
3994         if (ieee80211_config_bw(sdata, sta,
3995                                 elems.ht_cap_elem, elems.ht_operation,
3996                                 elems.vht_operation, elems.he_operation,
3997                                 bssid, &changed)) {
3998                 mutex_unlock(&local->sta_mtx);
3999                 sdata_info(sdata,
4000                            "failed to follow AP %pM bandwidth change, disconnect\n",
4001                            bssid);
4002                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4003                                        WLAN_REASON_DEAUTH_LEAVING,
4004                                        true, deauth_buf);
4005                 ieee80211_report_disconnect(sdata, deauth_buf,
4006                                             sizeof(deauth_buf), true,
4007                                             WLAN_REASON_DEAUTH_LEAVING);
4008                 return;
4009         }
4010
4011         if (sta && elems.opmode_notif)
4012                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
4013                                             rx_status->band);
4014         mutex_unlock(&local->sta_mtx);
4015
4016         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
4017                                                elems.country_elem,
4018                                                elems.country_elem_len,
4019                                                elems.pwr_constr_elem,
4020                                                elems.cisco_dtpc_elem);
4021
4022         ieee80211_bss_info_change_notify(sdata, changed);
4023 }
4024
4025 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
4026                                   struct sk_buff *skb)
4027 {
4028         struct ieee80211_rx_status *rx_status;
4029         struct ieee80211_mgmt *mgmt;
4030         u16 fc;
4031         struct ieee802_11_elems elems;
4032         int ies_len;
4033
4034         rx_status = (struct ieee80211_rx_status *) skb->cb;
4035         mgmt = (struct ieee80211_mgmt *) skb->data;
4036         fc = le16_to_cpu(mgmt->frame_control);
4037
4038         sdata_lock(sdata);
4039
4040         switch (fc & IEEE80211_FCTL_STYPE) {
4041         case IEEE80211_STYPE_BEACON:
4042                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
4043                 break;
4044         case IEEE80211_STYPE_PROBE_RESP:
4045                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
4046                 break;
4047         case IEEE80211_STYPE_AUTH:
4048                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
4049                 break;
4050         case IEEE80211_STYPE_DEAUTH:
4051                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
4052                 break;
4053         case IEEE80211_STYPE_DISASSOC:
4054                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
4055                 break;
4056         case IEEE80211_STYPE_ASSOC_RESP:
4057         case IEEE80211_STYPE_REASSOC_RESP:
4058                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
4059                 break;
4060         case IEEE80211_STYPE_ACTION:
4061                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
4062                         ies_len = skb->len -
4063                                   offsetof(struct ieee80211_mgmt,
4064                                            u.action.u.chan_switch.variable);
4065
4066                         if (ies_len < 0)
4067                                 break;
4068
4069                         /* CSA IE cannot be overridden, no need for BSSID */
4070                         ieee802_11_parse_elems(
4071                                 mgmt->u.action.u.chan_switch.variable,
4072                                 ies_len, true, &elems, mgmt->bssid, NULL);
4073
4074                         if (elems.parse_error)
4075                                 break;
4076
4077                         ieee80211_sta_process_chanswitch(sdata,
4078                                                  rx_status->mactime,
4079                                                  rx_status->device_timestamp,
4080                                                  &elems, false);
4081                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
4082                         ies_len = skb->len -
4083                                   offsetof(struct ieee80211_mgmt,
4084                                            u.action.u.ext_chan_switch.variable);
4085
4086                         if (ies_len < 0)
4087                                 break;
4088
4089                         /*
4090                          * extended CSA IE can't be overridden, no need for
4091                          * BSSID
4092                          */
4093                         ieee802_11_parse_elems(
4094                                 mgmt->u.action.u.ext_chan_switch.variable,
4095                                 ies_len, true, &elems, mgmt->bssid, NULL);
4096
4097                         if (elems.parse_error)
4098                                 break;
4099
4100                         /* for the handling code pretend this was also an IE */
4101                         elems.ext_chansw_ie =
4102                                 &mgmt->u.action.u.ext_chan_switch.data;
4103
4104                         ieee80211_sta_process_chanswitch(sdata,
4105                                                  rx_status->mactime,
4106                                                  rx_status->device_timestamp,
4107                                                  &elems, false);
4108                 }
4109                 break;
4110         }
4111         sdata_unlock(sdata);
4112 }
4113
4114 static void ieee80211_sta_timer(struct timer_list *t)
4115 {
4116         struct ieee80211_sub_if_data *sdata =
4117                 from_timer(sdata, t, u.mgd.timer);
4118
4119         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4120 }
4121
4122 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
4123                                           u8 *bssid, u8 reason, bool tx)
4124 {
4125         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4126
4127         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
4128                                tx, frame_buf);
4129
4130         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4131                                     reason);
4132 }
4133
4134 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
4135 {
4136         struct ieee80211_local *local = sdata->local;
4137         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4138         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
4139         u32 tx_flags = 0;
4140         u16 trans = 1;
4141         u16 status = 0;
4142         u16 prepare_tx_duration = 0;
4143
4144         sdata_assert_lock(sdata);
4145
4146         if (WARN_ON_ONCE(!auth_data))
4147                 return -EINVAL;
4148
4149         auth_data->tries++;
4150
4151         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
4152                 sdata_info(sdata, "authentication with %pM timed out\n",
4153                            auth_data->bss->bssid);
4154
4155                 /*
4156                  * Most likely AP is not in the range so remove the
4157                  * bss struct for that AP.
4158                  */
4159                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
4160
4161                 return -ETIMEDOUT;
4162         }
4163
4164         if (auth_data->algorithm == WLAN_AUTH_SAE)
4165                 prepare_tx_duration =
4166                         jiffies_to_msecs(IEEE80211_AUTH_TIMEOUT_SAE);
4167
4168         drv_mgd_prepare_tx(local, sdata, prepare_tx_duration);
4169
4170         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
4171                    auth_data->bss->bssid, auth_data->tries,
4172                    IEEE80211_AUTH_MAX_TRIES);
4173
4174         auth_data->expected_transaction = 2;
4175
4176         if (auth_data->algorithm == WLAN_AUTH_SAE) {
4177                 trans = auth_data->sae_trans;
4178                 status = auth_data->sae_status;
4179                 auth_data->expected_transaction = trans;
4180         }
4181
4182         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
4183                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
4184                            IEEE80211_TX_INTFL_MLME_CONN_TX;
4185
4186         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
4187                             auth_data->data, auth_data->data_len,
4188                             auth_data->bss->bssid,
4189                             auth_data->bss->bssid, NULL, 0, 0,
4190                             tx_flags);
4191
4192         if (tx_flags == 0) {
4193                 if (auth_data->algorithm == WLAN_AUTH_SAE)
4194                         auth_data->timeout = jiffies +
4195                                 IEEE80211_AUTH_TIMEOUT_SAE;
4196                 else
4197                         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
4198         } else {
4199                 auth_data->timeout =
4200                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
4201         }
4202
4203         auth_data->timeout_started = true;
4204         run_again(sdata, auth_data->timeout);
4205
4206         return 0;
4207 }
4208
4209 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
4210 {
4211         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
4212         struct ieee80211_local *local = sdata->local;
4213
4214         sdata_assert_lock(sdata);
4215
4216         assoc_data->tries++;
4217         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
4218                 sdata_info(sdata, "association with %pM timed out\n",
4219                            assoc_data->bss->bssid);
4220
4221                 /*
4222                  * Most likely AP is not in the range so remove the
4223                  * bss struct for that AP.
4224                  */
4225                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
4226
4227                 return -ETIMEDOUT;
4228         }
4229
4230         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
4231                    assoc_data->bss->bssid, assoc_data->tries,
4232                    IEEE80211_ASSOC_MAX_TRIES);
4233         ieee80211_send_assoc(sdata);
4234
4235         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
4236                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
4237                 assoc_data->timeout_started = true;
4238                 run_again(sdata, assoc_data->timeout);
4239         } else {
4240                 assoc_data->timeout =
4241                         round_jiffies_up(jiffies +
4242                                          IEEE80211_ASSOC_TIMEOUT_LONG);
4243                 assoc_data->timeout_started = true;
4244                 run_again(sdata, assoc_data->timeout);
4245         }
4246
4247         return 0;
4248 }
4249
4250 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
4251                                   __le16 fc, bool acked)
4252 {
4253         struct ieee80211_local *local = sdata->local;
4254
4255         sdata->u.mgd.status_fc = fc;
4256         sdata->u.mgd.status_acked = acked;
4257         sdata->u.mgd.status_received = true;
4258
4259         ieee80211_queue_work(&local->hw, &sdata->work);
4260 }
4261
4262 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
4263 {
4264         struct ieee80211_local *local = sdata->local;
4265         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4266
4267         sdata_lock(sdata);
4268
4269         if (ifmgd->status_received) {
4270                 __le16 fc = ifmgd->status_fc;
4271                 bool status_acked = ifmgd->status_acked;
4272
4273                 ifmgd->status_received = false;
4274                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
4275                         if (status_acked) {
4276                                 if (ifmgd->auth_data->algorithm ==
4277                                     WLAN_AUTH_SAE)
4278                                         ifmgd->auth_data->timeout =
4279                                                 jiffies +
4280                                                 IEEE80211_AUTH_TIMEOUT_SAE;
4281                                 else
4282                                         ifmgd->auth_data->timeout =
4283                                                 jiffies +
4284                                                 IEEE80211_AUTH_TIMEOUT_SHORT;
4285                                 run_again(sdata, ifmgd->auth_data->timeout);
4286                         } else {
4287                                 ifmgd->auth_data->timeout = jiffies - 1;
4288                         }
4289                         ifmgd->auth_data->timeout_started = true;
4290                 } else if (ifmgd->assoc_data &&
4291                            (ieee80211_is_assoc_req(fc) ||
4292                             ieee80211_is_reassoc_req(fc))) {
4293                         if (status_acked) {
4294                                 ifmgd->assoc_data->timeout =
4295                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
4296                                 run_again(sdata, ifmgd->assoc_data->timeout);
4297                         } else {
4298                                 ifmgd->assoc_data->timeout = jiffies - 1;
4299                         }
4300                         ifmgd->assoc_data->timeout_started = true;
4301                 }
4302         }
4303
4304         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
4305             time_after(jiffies, ifmgd->auth_data->timeout)) {
4306                 if (ifmgd->auth_data->done) {
4307                         /*
4308                          * ok ... we waited for assoc but userspace didn't,
4309                          * so let's just kill the auth data
4310                          */
4311                         ieee80211_destroy_auth_data(sdata, false);
4312                 } else if (ieee80211_auth(sdata)) {
4313                         u8 bssid[ETH_ALEN];
4314                         struct ieee80211_event event = {
4315                                 .type = MLME_EVENT,
4316                                 .u.mlme.data = AUTH_EVENT,
4317                                 .u.mlme.status = MLME_TIMEOUT,
4318                         };
4319
4320                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
4321
4322                         ieee80211_destroy_auth_data(sdata, false);
4323
4324                         cfg80211_auth_timeout(sdata->dev, bssid);
4325                         drv_event_callback(sdata->local, sdata, &event);
4326                 }
4327         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
4328                 run_again(sdata, ifmgd->auth_data->timeout);
4329
4330         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
4331             time_after(jiffies, ifmgd->assoc_data->timeout)) {
4332                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
4333                     ieee80211_do_assoc(sdata)) {
4334                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4335                         struct ieee80211_event event = {
4336                                 .type = MLME_EVENT,
4337                                 .u.mlme.data = ASSOC_EVENT,
4338                                 .u.mlme.status = MLME_TIMEOUT,
4339                         };
4340
4341                         ieee80211_destroy_assoc_data(sdata, false, false);
4342                         cfg80211_assoc_timeout(sdata->dev, bss);
4343                         drv_event_callback(sdata->local, sdata, &event);
4344                 }
4345         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
4346                 run_again(sdata, ifmgd->assoc_data->timeout);
4347
4348         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
4349             ifmgd->associated) {
4350                 u8 bssid[ETH_ALEN];
4351                 int max_tries;
4352
4353                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4354
4355                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
4356                         max_tries = max_nullfunc_tries;
4357                 else
4358                         max_tries = max_probe_tries;
4359
4360                 /* ACK received for nullfunc probing frame */
4361                 if (!ifmgd->probe_send_count)
4362                         ieee80211_reset_ap_probe(sdata);
4363                 else if (ifmgd->nullfunc_failed) {
4364                         if (ifmgd->probe_send_count < max_tries) {
4365                                 mlme_dbg(sdata,
4366                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
4367                                          bssid, ifmgd->probe_send_count,
4368                                          max_tries);
4369                                 ieee80211_mgd_probe_ap_send(sdata);
4370                         } else {
4371                                 mlme_dbg(sdata,
4372                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
4373                                          bssid);
4374                                 ieee80211_sta_connection_lost(sdata, bssid,
4375                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
4376                                         false);
4377                         }
4378                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
4379                         run_again(sdata, ifmgd->probe_timeout);
4380                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
4381                         mlme_dbg(sdata,
4382                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
4383                                  bssid, probe_wait_ms);
4384                         ieee80211_sta_connection_lost(sdata, bssid,
4385                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4386                 } else if (ifmgd->probe_send_count < max_tries) {
4387                         mlme_dbg(sdata,
4388                                  "No probe response from AP %pM after %dms, try %d/%i\n",
4389                                  bssid, probe_wait_ms,
4390                                  ifmgd->probe_send_count, max_tries);
4391                         ieee80211_mgd_probe_ap_send(sdata);
4392                 } else {
4393                         /*
4394                          * We actually lost the connection ... or did we?
4395                          * Let's make sure!
4396                          */
4397                         mlme_dbg(sdata,
4398                                  "No probe response from AP %pM after %dms, disconnecting.\n",
4399                                  bssid, probe_wait_ms);
4400
4401                         ieee80211_sta_connection_lost(sdata, bssid,
4402                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4403                 }
4404         }
4405
4406         sdata_unlock(sdata);
4407 }
4408
4409 static void ieee80211_sta_bcn_mon_timer(struct timer_list *t)
4410 {
4411         struct ieee80211_sub_if_data *sdata =
4412                 from_timer(sdata, t, u.mgd.bcn_mon_timer);
4413         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4414
4415         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4416                 return;
4417
4418         sdata->u.mgd.connection_loss = false;
4419         ieee80211_queue_work(&sdata->local->hw,
4420                              &sdata->u.mgd.beacon_connection_loss_work);
4421 }
4422
4423 static void ieee80211_sta_conn_mon_timer(struct timer_list *t)
4424 {
4425         struct ieee80211_sub_if_data *sdata =
4426                 from_timer(sdata, t, u.mgd.conn_mon_timer);
4427         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4428         struct ieee80211_local *local = sdata->local;
4429
4430         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4431                 return;
4432
4433         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4434 }
4435
4436 static void ieee80211_sta_monitor_work(struct work_struct *work)
4437 {
4438         struct ieee80211_sub_if_data *sdata =
4439                 container_of(work, struct ieee80211_sub_if_data,
4440                              u.mgd.monitor_work);
4441
4442         ieee80211_mgd_probe_ap(sdata, false);
4443 }
4444
4445 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4446 {
4447         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4448                 __ieee80211_stop_poll(sdata);
4449
4450                 /* let's probe the connection once */
4451                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4452                         ieee80211_queue_work(&sdata->local->hw,
4453                                              &sdata->u.mgd.monitor_work);
4454         }
4455 }
4456
4457 #ifdef CONFIG_PM
4458 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4459 {
4460         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4461         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4462
4463         sdata_lock(sdata);
4464
4465         if (ifmgd->auth_data || ifmgd->assoc_data) {
4466                 const u8 *bssid = ifmgd->auth_data ?
4467                                 ifmgd->auth_data->bss->bssid :
4468                                 ifmgd->assoc_data->bss->bssid;
4469
4470                 /*
4471                  * If we are trying to authenticate / associate while suspending,
4472                  * cfg80211 won't know and won't actually abort those attempts,
4473                  * thus we need to do that ourselves.
4474                  */
4475                 ieee80211_send_deauth_disassoc(sdata, bssid,
4476                                                IEEE80211_STYPE_DEAUTH,
4477                                                WLAN_REASON_DEAUTH_LEAVING,
4478                                                false, frame_buf);
4479                 if (ifmgd->assoc_data)
4480                         ieee80211_destroy_assoc_data(sdata, false, true);
4481                 if (ifmgd->auth_data)
4482                         ieee80211_destroy_auth_data(sdata, false);
4483                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4484                                       IEEE80211_DEAUTH_FRAME_LEN);
4485         }
4486
4487         /* This is a bit of a hack - we should find a better and more generic
4488          * solution to this. Normally when suspending, cfg80211 will in fact
4489          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4490          * auth (not so important) or assoc (this is the problem) process.
4491          *
4492          * As a consequence, it can happen that we are in the process of both
4493          * associating and suspending, and receive an association response
4494          * after cfg80211 has checked if it needs to disconnect, but before
4495          * we actually set the flag to drop incoming frames. This will then
4496          * cause the workqueue flush to process the association response in
4497          * the suspend, resulting in a successful association just before it
4498          * tries to remove the interface from the driver, which now though
4499          * has a channel context assigned ... this results in issues.
4500          *
4501          * To work around this (for now) simply deauth here again if we're
4502          * now connected.
4503          */
4504         if (ifmgd->associated && !sdata->local->wowlan) {
4505                 u8 bssid[ETH_ALEN];
4506                 struct cfg80211_deauth_request req = {
4507                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4508                         .bssid = bssid,
4509                 };
4510
4511                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4512                 ieee80211_mgd_deauth(sdata, &req);
4513         }
4514
4515         sdata_unlock(sdata);
4516 }
4517
4518 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4519 {
4520         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4521
4522         sdata_lock(sdata);
4523         if (!ifmgd->associated) {
4524                 sdata_unlock(sdata);
4525                 return;
4526         }
4527
4528         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4529                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4530                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4531                 ieee80211_sta_connection_lost(sdata,
4532                                               ifmgd->associated->bssid,
4533                                               WLAN_REASON_UNSPECIFIED,
4534                                               true);
4535                 sdata_unlock(sdata);
4536                 return;
4537         }
4538         sdata_unlock(sdata);
4539 }
4540 #endif
4541
4542 /* interface setup */
4543 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4544 {
4545         struct ieee80211_if_managed *ifmgd;
4546
4547         ifmgd = &sdata->u.mgd;
4548         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4549         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4550         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4551                   ieee80211_beacon_connection_loss_work);
4552         INIT_WORK(&ifmgd->csa_connection_drop_work,
4553                   ieee80211_csa_connection_drop_work);
4554         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4555         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4556                           ieee80211_tdls_peer_del_work);
4557         timer_setup(&ifmgd->timer, ieee80211_sta_timer, 0);
4558         timer_setup(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 0);
4559         timer_setup(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 0);
4560         timer_setup(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 0);
4561         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4562                           ieee80211_sta_handle_tspec_ac_params_wk);
4563
4564         ifmgd->flags = 0;
4565         ifmgd->powersave = sdata->wdev.ps;
4566         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4567         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4568         ifmgd->p2p_noa_index = -1;
4569
4570         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4571                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4572         else
4573                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4574
4575         /* Setup TDLS data */
4576         spin_lock_init(&ifmgd->teardown_lock);
4577         ifmgd->teardown_skb = NULL;
4578         ifmgd->orig_teardown_skb = NULL;
4579 }
4580
4581 /* scan finished notification */
4582 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4583 {
4584         struct ieee80211_sub_if_data *sdata;
4585
4586         /* Restart STA timers */
4587         rcu_read_lock();
4588         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4589                 if (ieee80211_sdata_running(sdata))
4590                         ieee80211_restart_sta_timer(sdata);
4591         }
4592         rcu_read_unlock();
4593 }
4594
4595 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4596                                      struct cfg80211_bss *cbss)
4597 {
4598         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4599         const u8 *ht_cap_ie, *vht_cap_ie;
4600         const struct ieee80211_ht_cap *ht_cap;
4601         const struct ieee80211_vht_cap *vht_cap;
4602         u8 chains = 1;
4603
4604         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4605                 return chains;
4606
4607         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4608         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4609                 ht_cap = (void *)(ht_cap_ie + 2);
4610                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4611                 /*
4612                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4613                  *       "Tx Unequal Modulation Supported" fields.
4614                  */
4615         }
4616
4617         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4618                 return chains;
4619
4620         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4621         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4622                 u8 nss;
4623                 u16 tx_mcs_map;
4624
4625                 vht_cap = (void *)(vht_cap_ie + 2);
4626                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4627                 for (nss = 8; nss > 0; nss--) {
4628                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4629                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4630                                 break;
4631                 }
4632                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4633                 chains = max(chains, nss);
4634         }
4635
4636         return chains;
4637 }
4638
4639 static bool
4640 ieee80211_verify_sta_he_mcs_support(struct ieee80211_supported_band *sband,
4641                                     const struct ieee80211_he_operation *he_op)
4642 {
4643         const struct ieee80211_sta_he_cap *sta_he_cap =
4644                 ieee80211_get_he_sta_cap(sband);
4645         u16 ap_min_req_set;
4646         int i;
4647
4648         if (!sta_he_cap || !he_op)
4649                 return false;
4650
4651         ap_min_req_set = le16_to_cpu(he_op->he_mcs_nss_set);
4652
4653         /* Need to go over for 80MHz, 160MHz and for 80+80 */
4654         for (i = 0; i < 3; i++) {
4655                 const struct ieee80211_he_mcs_nss_supp *sta_mcs_nss_supp =
4656                         &sta_he_cap->he_mcs_nss_supp;
4657                 u16 sta_mcs_map_rx =
4658                         le16_to_cpu(((__le16 *)sta_mcs_nss_supp)[2 * i]);
4659                 u16 sta_mcs_map_tx =
4660                         le16_to_cpu(((__le16 *)sta_mcs_nss_supp)[2 * i + 1]);
4661                 u8 nss;
4662                 bool verified = true;
4663
4664                 /*
4665                  * For each band there is a maximum of 8 spatial streams
4666                  * possible. Each of the sta_mcs_map_* is a 16-bit struct built
4667                  * of 2 bits per NSS (1-8), with the values defined in enum
4668                  * ieee80211_he_mcs_support. Need to make sure STA TX and RX
4669                  * capabilities aren't less than the AP's minimum requirements
4670                  * for this HE BSS per SS.
4671                  * It is enough to find one such band that meets the reqs.
4672                  */
4673                 for (nss = 8; nss > 0; nss--) {
4674                         u8 sta_rx_val = (sta_mcs_map_rx >> (2 * (nss - 1))) & 3;
4675                         u8 sta_tx_val = (sta_mcs_map_tx >> (2 * (nss - 1))) & 3;
4676                         u8 ap_val = (ap_min_req_set >> (2 * (nss - 1))) & 3;
4677
4678                         if (ap_val == IEEE80211_HE_MCS_NOT_SUPPORTED)
4679                                 continue;
4680
4681                         /*
4682                          * Make sure the HE AP doesn't require MCSs that aren't
4683                          * supported by the client
4684                          */
4685                         if (sta_rx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||
4686                             sta_tx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||
4687                             (ap_val > sta_rx_val) || (ap_val > sta_tx_val)) {
4688                                 verified = false;
4689                                 break;
4690                         }
4691                 }
4692
4693                 if (verified)
4694                         return true;
4695         }
4696
4697         /* If here, STA doesn't meet AP's HE min requirements */
4698         return false;
4699 }
4700
4701 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4702                                   struct cfg80211_bss *cbss)
4703 {
4704         struct ieee80211_local *local = sdata->local;
4705         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4706         const struct ieee80211_ht_cap *ht_cap = NULL;
4707         const struct ieee80211_ht_operation *ht_oper = NULL;
4708         const struct ieee80211_vht_operation *vht_oper = NULL;
4709         const struct ieee80211_he_operation *he_oper = NULL;
4710         struct ieee80211_supported_band *sband;
4711         struct cfg80211_chan_def chandef;
4712         int ret;
4713         u32 i;
4714         bool have_80mhz;
4715
4716         sband = local->hw.wiphy->bands[cbss->channel->band];
4717
4718         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4719                           IEEE80211_STA_DISABLE_80P80MHZ |
4720                           IEEE80211_STA_DISABLE_160MHZ);
4721
4722         rcu_read_lock();
4723
4724         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4725             sband->ht_cap.ht_supported) {
4726                 const u8 *ht_oper_ie, *ht_cap_ie;
4727
4728                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4729                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4730                         ht_oper = (void *)(ht_oper_ie + 2);
4731
4732                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4733                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4734                         ht_cap = (void *)(ht_cap_ie + 2);
4735
4736                 if (!ht_cap) {
4737                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4738                         ht_oper = NULL;
4739                 }
4740         }
4741
4742         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4743             sband->vht_cap.vht_supported) {
4744                 const u8 *vht_oper_ie, *vht_cap;
4745
4746                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4747                                                    WLAN_EID_VHT_OPERATION);
4748                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4749                         vht_oper = (void *)(vht_oper_ie + 2);
4750                 if (vht_oper && !ht_oper) {
4751                         vht_oper = NULL;
4752                         sdata_info(sdata,
4753                                    "AP advertised VHT without HT, disabling both\n");
4754                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4755                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4756                 }
4757
4758                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4759                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4760                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4761                         vht_oper = NULL;
4762                 }
4763         }
4764
4765         if (!ieee80211_get_he_sta_cap(sband))
4766                 ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
4767
4768         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HE)) {
4769                 const struct cfg80211_bss_ies *ies;
4770                 const u8 *he_oper_ie;
4771
4772                 ies = rcu_dereference(cbss->ies);
4773                 he_oper_ie = cfg80211_find_ext_ie(WLAN_EID_EXT_HE_OPERATION,
4774                                                   ies->data, ies->len);
4775                 if (he_oper_ie &&
4776                     he_oper_ie[1] == ieee80211_he_oper_size(&he_oper_ie[3]))
4777                         he_oper = (void *)(he_oper_ie + 3);
4778                 else
4779                         he_oper = NULL;
4780
4781                 if (!ieee80211_verify_sta_he_mcs_support(sband, he_oper))
4782                         ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
4783         }
4784
4785         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4786         have_80mhz = false;
4787         for (i = 0; i < sband->n_channels; i++) {
4788                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4789                                                 IEEE80211_CHAN_NO_80MHZ))
4790                         continue;
4791
4792                 have_80mhz = true;
4793                 break;
4794         }
4795
4796         if (!have_80mhz)
4797                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4798
4799         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4800                                                      cbss->channel,
4801                                                      ht_oper, vht_oper, he_oper,
4802                                                      &chandef, false);
4803
4804         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4805                                       local->rx_chains);
4806
4807         rcu_read_unlock();
4808
4809         /* will change later if needed */
4810         sdata->smps_mode = IEEE80211_SMPS_OFF;
4811
4812         mutex_lock(&local->mtx);
4813         /*
4814          * If this fails (possibly due to channel context sharing
4815          * on incompatible channels, e.g. 80+80 and 160 sharing the
4816          * same control channel) try to use a smaller bandwidth.
4817          */
4818         ret = ieee80211_vif_use_channel(sdata, &chandef,
4819                                         IEEE80211_CHANCTX_SHARED);
4820
4821         /* don't downgrade for 5 and 10 MHz channels, though. */
4822         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4823             chandef.width == NL80211_CHAN_WIDTH_10)
4824                 goto out;
4825
4826         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4827                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4828                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4829                                                 IEEE80211_CHANCTX_SHARED);
4830         }
4831  out:
4832         mutex_unlock(&local->mtx);
4833         return ret;
4834 }
4835
4836 static bool ieee80211_get_dtim(const struct cfg80211_bss_ies *ies,
4837                                u8 *dtim_count, u8 *dtim_period)
4838 {
4839         const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM, ies->data, ies->len);
4840         const u8 *idx_ie = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX, ies->data,
4841                                          ies->len);
4842         const struct ieee80211_tim_ie *tim = NULL;
4843         const struct ieee80211_bssid_index *idx;
4844         bool valid = tim_ie && tim_ie[1] >= 2;
4845
4846         if (valid)
4847                 tim = (void *)(tim_ie + 2);
4848
4849         if (dtim_count)
4850                 *dtim_count = valid ? tim->dtim_count : 0;
4851
4852         if (dtim_period)
4853                 *dtim_period = valid ? tim->dtim_period : 0;
4854
4855         /* Check if value is overridden by non-transmitted profile */
4856         if (!idx_ie || idx_ie[1] < 3)
4857                 return valid;
4858
4859         idx = (void *)(idx_ie + 2);
4860
4861         if (dtim_count)
4862                 *dtim_count = idx->dtim_count;
4863
4864         if (dtim_period)
4865                 *dtim_period = idx->dtim_period;
4866
4867         return true;
4868 }
4869
4870 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4871                                      struct cfg80211_bss *cbss, bool assoc,
4872                                      bool override)
4873 {
4874         struct ieee80211_local *local = sdata->local;
4875         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4876         struct ieee80211_bss *bss = (void *)cbss->priv;
4877         struct sta_info *new_sta = NULL;
4878         struct ieee80211_supported_band *sband;
4879         bool have_sta = false;
4880         int err;
4881
4882         sband = local->hw.wiphy->bands[cbss->channel->band];
4883
4884         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4885                 return -EINVAL;
4886
4887         /* If a reconfig is happening, bail out */
4888         if (local->in_reconfig)
4889                 return -EBUSY;
4890
4891         if (assoc) {
4892                 rcu_read_lock();
4893                 have_sta = sta_info_get(sdata, cbss->bssid);
4894                 rcu_read_unlock();
4895         }
4896
4897         if (!have_sta) {
4898                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4899                 if (!new_sta)
4900                         return -ENOMEM;
4901         }
4902
4903         /*
4904          * Set up the information for the new channel before setting the
4905          * new channel. We can't - completely race-free - change the basic
4906          * rates bitmap and the channel (sband) that it refers to, but if
4907          * we set it up before we at least avoid calling into the driver's
4908          * bss_info_changed() method with invalid information (since we do
4909          * call that from changing the channel - only for IDLE and perhaps
4910          * some others, but ...).
4911          *
4912          * So to avoid that, just set up all the new information before the
4913          * channel, but tell the driver to apply it only afterwards, since
4914          * it might need the new channel for that.
4915          */
4916         if (new_sta) {
4917                 u32 rates = 0, basic_rates = 0;
4918                 bool have_higher_than_11mbit;
4919                 int min_rate = INT_MAX, min_rate_index = -1;
4920                 const struct cfg80211_bss_ies *ies;
4921                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4922
4923                 ieee80211_get_rates(sband, bss->supp_rates,
4924                                     bss->supp_rates_len,
4925                                     &rates, &basic_rates,
4926                                     &have_higher_than_11mbit,
4927                                     &min_rate, &min_rate_index,
4928                                     shift);
4929
4930                 /*
4931                  * This used to be a workaround for basic rates missing
4932                  * in the association response frame. Now that we no
4933                  * longer use the basic rates from there, it probably
4934                  * doesn't happen any more, but keep the workaround so
4935                  * in case some *other* APs are buggy in different ways
4936                  * we can connect -- with a warning.
4937                  */
4938                 if (!basic_rates && min_rate_index >= 0) {
4939                         sdata_info(sdata,
4940                                    "No basic rates, using min rate instead\n");
4941                         basic_rates = BIT(min_rate_index);
4942                 }
4943
4944                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4945                 sdata->vif.bss_conf.basic_rates = basic_rates;
4946
4947                 /* cf. IEEE 802.11 9.2.12 */
4948                 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4949                     have_higher_than_11mbit)
4950                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4951                 else
4952                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4953
4954                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4955
4956                 /* set timing information */
4957                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4958                 rcu_read_lock();
4959                 ies = rcu_dereference(cbss->beacon_ies);
4960                 if (ies) {
4961                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4962                         sdata->vif.bss_conf.sync_device_ts =
4963                                 bss->device_ts_beacon;
4964
4965                         ieee80211_get_dtim(ies,
4966                                            &sdata->vif.bss_conf.sync_dtim_count,
4967                                            NULL);
4968                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4969                                                TIMING_BEACON_ONLY)) {
4970                         ies = rcu_dereference(cbss->proberesp_ies);
4971                         /* must be non-NULL since beacon IEs were NULL */
4972                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4973                         sdata->vif.bss_conf.sync_device_ts =
4974                                 bss->device_ts_presp;
4975                         sdata->vif.bss_conf.sync_dtim_count = 0;
4976                 } else {
4977                         sdata->vif.bss_conf.sync_tsf = 0;
4978                         sdata->vif.bss_conf.sync_device_ts = 0;
4979                         sdata->vif.bss_conf.sync_dtim_count = 0;
4980                 }
4981                 rcu_read_unlock();
4982         }
4983
4984         if (new_sta || override) {
4985                 err = ieee80211_prep_channel(sdata, cbss);
4986                 if (err) {
4987                         if (new_sta)
4988                                 sta_info_free(local, new_sta);
4989                         return -EINVAL;
4990                 }
4991         }
4992
4993         if (new_sta) {
4994                 /*
4995                  * tell driver about BSSID, basic rates and timing
4996                  * this was set up above, before setting the channel
4997                  */
4998                 ieee80211_bss_info_change_notify(sdata,
4999                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
5000                         BSS_CHANGED_BEACON_INT);
5001
5002                 if (assoc)
5003                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
5004
5005                 err = sta_info_insert(new_sta);
5006                 new_sta = NULL;
5007                 if (err) {
5008                         sdata_info(sdata,
5009                                    "failed to insert STA entry for the AP (error %d)\n",
5010                                    err);
5011                         return err;
5012                 }
5013         } else
5014                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
5015
5016         /* Cancel scan to ensure that nothing interferes with connection */
5017         if (local->scanning)
5018                 ieee80211_scan_cancel(local);
5019
5020         return 0;
5021 }
5022
5023 /* config hooks */
5024 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
5025                        struct cfg80211_auth_request *req)
5026 {
5027         struct ieee80211_local *local = sdata->local;
5028         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5029         struct ieee80211_mgd_auth_data *auth_data;
5030         u16 auth_alg;
5031         int err;
5032         bool cont_auth;
5033
5034         /* prepare auth data structure */
5035
5036         switch (req->auth_type) {
5037         case NL80211_AUTHTYPE_OPEN_SYSTEM:
5038                 auth_alg = WLAN_AUTH_OPEN;
5039                 break;
5040         case NL80211_AUTHTYPE_SHARED_KEY:
5041                 if (IS_ERR(local->wep_tx_tfm))
5042                         return -EOPNOTSUPP;
5043                 auth_alg = WLAN_AUTH_SHARED_KEY;
5044                 break;
5045         case NL80211_AUTHTYPE_FT:
5046                 auth_alg = WLAN_AUTH_FT;
5047                 break;
5048         case NL80211_AUTHTYPE_NETWORK_EAP:
5049                 auth_alg = WLAN_AUTH_LEAP;
5050                 break;
5051         case NL80211_AUTHTYPE_SAE:
5052                 auth_alg = WLAN_AUTH_SAE;
5053                 break;
5054         case NL80211_AUTHTYPE_FILS_SK:
5055                 auth_alg = WLAN_AUTH_FILS_SK;
5056                 break;
5057         case NL80211_AUTHTYPE_FILS_SK_PFS:
5058                 auth_alg = WLAN_AUTH_FILS_SK_PFS;
5059                 break;
5060         case NL80211_AUTHTYPE_FILS_PK:
5061                 auth_alg = WLAN_AUTH_FILS_PK;
5062                 break;
5063         default:
5064                 return -EOPNOTSUPP;
5065         }
5066
5067         if (ifmgd->assoc_data)
5068                 return -EBUSY;
5069
5070         auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
5071                             req->ie_len, GFP_KERNEL);
5072         if (!auth_data)
5073                 return -ENOMEM;
5074
5075         auth_data->bss = req->bss;
5076
5077         if (req->auth_data_len >= 4) {
5078                 if (req->auth_type == NL80211_AUTHTYPE_SAE) {
5079                         __le16 *pos = (__le16 *) req->auth_data;
5080
5081                         auth_data->sae_trans = le16_to_cpu(pos[0]);
5082                         auth_data->sae_status = le16_to_cpu(pos[1]);
5083                 }
5084                 memcpy(auth_data->data, req->auth_data + 4,
5085                        req->auth_data_len - 4);
5086                 auth_data->data_len += req->auth_data_len - 4;
5087         }
5088
5089         /* Check if continuing authentication or trying to authenticate with the
5090          * same BSS that we were in the process of authenticating with and avoid
5091          * removal and re-addition of the STA entry in
5092          * ieee80211_prep_connection().
5093          */
5094         cont_auth = ifmgd->auth_data && req->bss == ifmgd->auth_data->bss;
5095
5096         if (req->ie && req->ie_len) {
5097                 memcpy(&auth_data->data[auth_data->data_len],
5098                        req->ie, req->ie_len);
5099                 auth_data->data_len += req->ie_len;
5100         }
5101
5102         if (req->key && req->key_len) {
5103                 auth_data->key_len = req->key_len;
5104                 auth_data->key_idx = req->key_idx;
5105                 memcpy(auth_data->key, req->key, req->key_len);
5106         }
5107
5108         auth_data->algorithm = auth_alg;
5109
5110         /* try to authenticate/probe */
5111
5112         if (ifmgd->auth_data) {
5113                 if (cont_auth && req->auth_type == NL80211_AUTHTYPE_SAE) {
5114                         auth_data->peer_confirmed =
5115                                 ifmgd->auth_data->peer_confirmed;
5116                 }
5117                 ieee80211_destroy_auth_data(sdata, cont_auth);
5118         }
5119
5120         /* prep auth_data so we don't go into idle on disassoc */
5121         ifmgd->auth_data = auth_data;
5122
5123         /* If this is continuation of an ongoing SAE authentication exchange
5124          * (i.e., request to send SAE Confirm) and the peer has already
5125          * confirmed, mark authentication completed since we are about to send
5126          * out SAE Confirm.
5127          */
5128         if (cont_auth && req->auth_type == NL80211_AUTHTYPE_SAE &&
5129             auth_data->peer_confirmed && auth_data->sae_trans == 2)
5130                 ieee80211_mark_sta_auth(sdata, req->bss->bssid);
5131
5132         if (ifmgd->associated) {
5133                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5134
5135                 sdata_info(sdata,
5136                            "disconnect from AP %pM for new auth to %pM\n",
5137                            ifmgd->associated->bssid, req->bss->bssid);
5138                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5139                                        WLAN_REASON_UNSPECIFIED,
5140                                        false, frame_buf);
5141
5142                 ieee80211_report_disconnect(sdata, frame_buf,
5143                                             sizeof(frame_buf), true,
5144                                             WLAN_REASON_UNSPECIFIED);
5145         }
5146
5147         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
5148
5149         err = ieee80211_prep_connection(sdata, req->bss, cont_auth, false);
5150         if (err)
5151                 goto err_clear;
5152
5153         err = ieee80211_auth(sdata);
5154         if (err) {
5155                 sta_info_destroy_addr(sdata, req->bss->bssid);
5156                 goto err_clear;
5157         }
5158
5159         /* hold our own reference */
5160         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
5161         return 0;
5162
5163  err_clear:
5164         eth_zero_addr(ifmgd->bssid);
5165         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
5166         ifmgd->auth_data = NULL;
5167         mutex_lock(&sdata->local->mtx);
5168         ieee80211_vif_release_channel(sdata);
5169         mutex_unlock(&sdata->local->mtx);
5170         kfree(auth_data);
5171         return err;
5172 }
5173
5174 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
5175                         struct cfg80211_assoc_request *req)
5176 {
5177         struct ieee80211_local *local = sdata->local;
5178         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5179         struct ieee80211_bss *bss = (void *)req->bss->priv;
5180         struct ieee80211_mgd_assoc_data *assoc_data;
5181         const struct cfg80211_bss_ies *beacon_ies;
5182         struct ieee80211_supported_band *sband;
5183         const u8 *ssidie, *ht_ie, *vht_ie;
5184         int i, err;
5185         bool override = false;
5186
5187         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
5188         if (!assoc_data)
5189                 return -ENOMEM;
5190
5191         rcu_read_lock();
5192         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
5193         if (!ssidie) {
5194                 rcu_read_unlock();
5195                 kfree(assoc_data);
5196                 return -EINVAL;
5197         }
5198         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
5199         assoc_data->ssid_len = ssidie[1];
5200         rcu_read_unlock();
5201
5202         if (ifmgd->associated) {
5203                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5204
5205                 sdata_info(sdata,
5206                            "disconnect from AP %pM for new assoc to %pM\n",
5207                            ifmgd->associated->bssid, req->bss->bssid);
5208                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5209                                        WLAN_REASON_UNSPECIFIED,
5210                                        false, frame_buf);
5211
5212                 ieee80211_report_disconnect(sdata, frame_buf,
5213                                             sizeof(frame_buf), true,
5214                                             WLAN_REASON_UNSPECIFIED);
5215         }
5216
5217         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
5218                 err = -EBUSY;
5219                 goto err_free;
5220         }
5221
5222         if (ifmgd->assoc_data) {
5223                 err = -EBUSY;
5224                 goto err_free;
5225         }
5226
5227         if (ifmgd->auth_data) {
5228                 bool match;
5229
5230                 /* keep sta info, bssid if matching */
5231                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
5232                 ieee80211_destroy_auth_data(sdata, match);
5233         }
5234
5235         /* prepare assoc data */
5236
5237         ifmgd->beacon_crc_valid = false;
5238
5239         assoc_data->wmm = bss->wmm_used &&
5240                           (local->hw.queues >= IEEE80211_NUM_ACS);
5241
5242         /*
5243          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
5244          * We still associate in non-HT mode (11a/b/g) if any one of these
5245          * ciphers is configured as pairwise.
5246          * We can set this to true for non-11n hardware, that'll be checked
5247          * separately along with the peer capabilities.
5248          */
5249         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
5250                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
5251                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
5252                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
5253                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
5254                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
5255                         ifmgd->flags |= IEEE80211_STA_DISABLE_HE;
5256                         netdev_info(sdata->dev,
5257                                     "disabling HE/HT/VHT due to WEP/TKIP use\n");
5258                 }
5259         }
5260
5261         /* Also disable HT if we don't support it or the AP doesn't use WMM */
5262         sband = local->hw.wiphy->bands[req->bss->channel->band];
5263         if (!sband->ht_cap.ht_supported ||
5264             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
5265             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
5266                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
5267                 if (!bss->wmm_used &&
5268                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
5269                         netdev_info(sdata->dev,
5270                                     "disabling HT as WMM/QoS is not supported by the AP\n");
5271         }
5272
5273         /* disable VHT if we don't support it or the AP doesn't use WMM */
5274         if (!sband->vht_cap.vht_supported ||
5275             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
5276             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
5277                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
5278                 if (!bss->wmm_used &&
5279                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
5280                         netdev_info(sdata->dev,
5281                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
5282         }
5283
5284         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
5285         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
5286                sizeof(ifmgd->ht_capa_mask));
5287
5288         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
5289         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
5290                sizeof(ifmgd->vht_capa_mask));
5291
5292         if (req->ie && req->ie_len) {
5293                 memcpy(assoc_data->ie, req->ie, req->ie_len);
5294                 assoc_data->ie_len = req->ie_len;
5295         }
5296
5297         if (req->fils_kek) {
5298                 /* should already be checked in cfg80211 - so warn */
5299                 if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
5300                         err = -EINVAL;
5301                         goto err_free;
5302                 }
5303                 memcpy(assoc_data->fils_kek, req->fils_kek,
5304                        req->fils_kek_len);
5305                 assoc_data->fils_kek_len = req->fils_kek_len;
5306         }
5307
5308         if (req->fils_nonces)
5309                 memcpy(assoc_data->fils_nonces, req->fils_nonces,
5310                        2 * FILS_NONCE_LEN);
5311
5312         assoc_data->bss = req->bss;
5313
5314         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
5315                 if (ifmgd->powersave)
5316                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
5317                 else
5318                         sdata->smps_mode = IEEE80211_SMPS_OFF;
5319         } else
5320                 sdata->smps_mode = ifmgd->req_smps;
5321
5322         assoc_data->capability = req->bss->capability;
5323         assoc_data->supp_rates = bss->supp_rates;
5324         assoc_data->supp_rates_len = bss->supp_rates_len;
5325
5326         rcu_read_lock();
5327         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
5328         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
5329                 assoc_data->ap_ht_param =
5330                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
5331         else
5332                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
5333         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
5334         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
5335                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
5336                        sizeof(struct ieee80211_vht_cap));
5337         else
5338                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
5339         rcu_read_unlock();
5340
5341         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
5342                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
5343              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
5344                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
5345
5346         if (bss->wmm_used && bss->uapsd_supported &&
5347             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
5348                 assoc_data->uapsd = true;
5349                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
5350         } else {
5351                 assoc_data->uapsd = false;
5352                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
5353         }
5354
5355         if (req->prev_bssid)
5356                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
5357
5358         if (req->use_mfp) {
5359                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
5360                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
5361         } else {
5362                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
5363                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
5364         }
5365
5366         if (req->flags & ASSOC_REQ_USE_RRM)
5367                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
5368         else
5369                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
5370
5371         if (req->crypto.control_port)
5372                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
5373         else
5374                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
5375
5376         sdata->control_port_protocol = req->crypto.control_port_ethertype;
5377         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
5378         sdata->control_port_over_nl80211 =
5379                                         req->crypto.control_port_over_nl80211;
5380         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
5381                                                         sdata->vif.type);
5382
5383         /* kick off associate process */
5384
5385         ifmgd->assoc_data = assoc_data;
5386         ifmgd->dtim_period = 0;
5387         ifmgd->have_beacon = false;
5388
5389         /* override HT/VHT configuration only if the AP and we support it */
5390         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
5391                 struct ieee80211_sta_ht_cap sta_ht_cap;
5392
5393                 if (req->flags & ASSOC_REQ_DISABLE_HT)
5394                         override = true;
5395
5396                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
5397                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
5398
5399                 /* check for 40 MHz disable override */
5400                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
5401                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
5402                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
5403                         override = true;
5404
5405                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
5406                     req->flags & ASSOC_REQ_DISABLE_VHT)
5407                         override = true;
5408         }
5409
5410         if (req->flags & ASSOC_REQ_DISABLE_HT) {
5411                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
5412                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
5413         }
5414
5415         if (req->flags & ASSOC_REQ_DISABLE_VHT)
5416                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
5417
5418         err = ieee80211_prep_connection(sdata, req->bss, true, override);
5419         if (err)
5420                 goto err_clear;
5421
5422         rcu_read_lock();
5423         beacon_ies = rcu_dereference(req->bss->beacon_ies);
5424
5425         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
5426             !beacon_ies) {
5427                 /*
5428                  * Wait up to one beacon interval ...
5429                  * should this be more if we miss one?
5430                  */
5431                 sdata_info(sdata, "waiting for beacon from %pM\n",
5432                            ifmgd->bssid);
5433                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
5434                 assoc_data->timeout_started = true;
5435                 assoc_data->need_beacon = true;
5436         } else if (beacon_ies) {
5437                 const u8 *ie;
5438                 u8 dtim_count = 0;
5439
5440                 ieee80211_get_dtim(beacon_ies, &dtim_count,
5441                                    &ifmgd->dtim_period);
5442
5443                 ifmgd->have_beacon = true;
5444                 assoc_data->timeout = jiffies;
5445                 assoc_data->timeout_started = true;
5446
5447                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
5448                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
5449                         sdata->vif.bss_conf.sync_device_ts =
5450                                 bss->device_ts_beacon;
5451                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
5452                 }
5453
5454                 ie = cfg80211_find_ext_ie(WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION,
5455                                           beacon_ies->data, beacon_ies->len);
5456                 if (ie && ie[1] >= 3)
5457                         sdata->vif.bss_conf.profile_periodicity = ie[4];
5458
5459                 ie = cfg80211_find_ie(WLAN_EID_EXT_CAPABILITY,
5460                                       beacon_ies->data, beacon_ies->len);
5461                 if (ie && ie[1] >= 11 &&
5462                     (ie[10] & WLAN_EXT_CAPA11_EMA_SUPPORT))
5463                         sdata->vif.bss_conf.ema_ap = true;
5464         } else {
5465                 assoc_data->timeout = jiffies;
5466                 assoc_data->timeout_started = true;
5467         }
5468         rcu_read_unlock();
5469
5470         run_again(sdata, assoc_data->timeout);
5471
5472         if (bss->corrupt_data) {
5473                 char *corrupt_type = "data";
5474                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
5475                         if (bss->corrupt_data &
5476                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
5477                                 corrupt_type = "beacon and probe response";
5478                         else
5479                                 corrupt_type = "beacon";
5480                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
5481                         corrupt_type = "probe response";
5482                 sdata_info(sdata, "associating with AP with corrupt %s\n",
5483                            corrupt_type);
5484         }
5485
5486         return 0;
5487  err_clear:
5488         eth_zero_addr(ifmgd->bssid);
5489         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
5490         ifmgd->assoc_data = NULL;
5491  err_free:
5492         kfree(assoc_data);
5493         return err;
5494 }
5495
5496 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
5497                          struct cfg80211_deauth_request *req)
5498 {
5499         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5500         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5501         bool tx = !req->local_state_change;
5502
5503         if (ifmgd->auth_data &&
5504             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
5505                 sdata_info(sdata,
5506                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
5507                            req->bssid, req->reason_code,
5508                            ieee80211_get_reason_code_string(req->reason_code));
5509
5510                 drv_mgd_prepare_tx(sdata->local, sdata, 0);
5511                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
5512                                                IEEE80211_STYPE_DEAUTH,
5513                                                req->reason_code, tx,
5514                                                frame_buf);
5515                 ieee80211_destroy_auth_data(sdata, false);
5516                 ieee80211_report_disconnect(sdata, frame_buf,
5517                                             sizeof(frame_buf), true,
5518                                             req->reason_code);
5519
5520                 return 0;
5521         }
5522
5523         if (ifmgd->assoc_data &&
5524             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
5525                 sdata_info(sdata,
5526                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
5527                            req->bssid, req->reason_code,
5528                            ieee80211_get_reason_code_string(req->reason_code));
5529
5530                 drv_mgd_prepare_tx(sdata->local, sdata, 0);
5531                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
5532                                                IEEE80211_STYPE_DEAUTH,
5533                                                req->reason_code, tx,
5534                                                frame_buf);
5535                 ieee80211_destroy_assoc_data(sdata, false, true);
5536                 ieee80211_report_disconnect(sdata, frame_buf,
5537                                             sizeof(frame_buf), true,
5538                                             req->reason_code);
5539                 return 0;
5540         }
5541
5542         if (ifmgd->associated &&
5543             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5544                 sdata_info(sdata,
5545                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
5546                            req->bssid, req->reason_code,
5547                            ieee80211_get_reason_code_string(req->reason_code));
5548
5549                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5550                                        req->reason_code, tx, frame_buf);
5551                 ieee80211_report_disconnect(sdata, frame_buf,
5552                                             sizeof(frame_buf), true,
5553                                             req->reason_code);
5554                 return 0;
5555         }
5556
5557         return -ENOTCONN;
5558 }
5559
5560 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5561                            struct cfg80211_disassoc_request *req)
5562 {
5563         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5564         u8 bssid[ETH_ALEN];
5565         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5566
5567         /*
5568          * cfg80211 should catch this ... but it's racy since
5569          * we can receive a disassoc frame, process it, hand it
5570          * to cfg80211 while that's in a locked section already
5571          * trying to tell us that the user wants to disconnect.
5572          */
5573         if (ifmgd->associated != req->bss)
5574                 return -ENOLINK;
5575
5576         sdata_info(sdata,
5577                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5578                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5579
5580         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5581         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5582                                req->reason_code, !req->local_state_change,
5583                                frame_buf);
5584
5585         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5586                                     req->reason_code);
5587
5588         return 0;
5589 }
5590
5591 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5592 {
5593         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5594
5595         /*
5596          * Make sure some work items will not run after this,
5597          * they will not do anything but might not have been
5598          * cancelled when disconnecting.
5599          */
5600         cancel_work_sync(&ifmgd->monitor_work);
5601         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5602         cancel_work_sync(&ifmgd->request_smps_work);
5603         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5604         cancel_work_sync(&ifmgd->chswitch_work);
5605         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5606
5607         sdata_lock(sdata);
5608         if (ifmgd->assoc_data) {
5609                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5610                 ieee80211_destroy_assoc_data(sdata, false, false);
5611                 cfg80211_assoc_timeout(sdata->dev, bss);
5612         }
5613         if (ifmgd->auth_data)
5614                 ieee80211_destroy_auth_data(sdata, false);
5615         spin_lock_bh(&ifmgd->teardown_lock);
5616         if (ifmgd->teardown_skb) {
5617                 kfree_skb(ifmgd->teardown_skb);
5618                 ifmgd->teardown_skb = NULL;
5619                 ifmgd->orig_teardown_skb = NULL;
5620         }
5621         kfree(ifmgd->assoc_req_ies);
5622         ifmgd->assoc_req_ies = NULL;
5623         ifmgd->assoc_req_ies_len = 0;
5624         spin_unlock_bh(&ifmgd->teardown_lock);
5625         del_timer_sync(&ifmgd->timer);
5626         sdata_unlock(sdata);
5627 }
5628
5629 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5630                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5631                                s32 rssi_level,
5632                                gfp_t gfp)
5633 {
5634         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5635
5636         trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level);
5637
5638         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp);
5639 }
5640 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5641
5642 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5643 {
5644         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5645
5646         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5647
5648         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5649 }
5650 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);