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 Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33
  34 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  35 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  36 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  37 #define IEEE80211_AUTH_MAX_TRIES        3
  38 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  39 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  40 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  41 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  42 #define IEEE80211_ASSOC_MAX_TRIES       3
  43
  44 static int max_nullfunc_tries = 2;
  45 module_param(max_nullfunc_tries, int, 0644);
  46 MODULE_PARM_DESC(max_nullfunc_tries,
  47                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  48
  49 static int max_probe_tries = 5;
  50 module_param(max_probe_tries, int, 0644);
  51 MODULE_PARM_DESC(max_probe_tries,
  52                  "Maximum probe tries before disconnecting (reason 4).");
  53
  54 /*
  55  * Beacon loss timeout is calculated as N frames times the
  56  * advertised beacon interval.  This may need to be somewhat
  57  * higher than what hardware might detect to account for
  58  * delays in the host processing frames. But since we also
  59  * probe on beacon miss before declaring the connection lost
  60  * default to what we want.
  61  */
  62 static int beacon_loss_count = 7;
  63 module_param(beacon_loss_count, int, 0644);
  64 MODULE_PARM_DESC(beacon_loss_count,
  65                  "Number of beacon intervals before we decide beacon was lost.");
  66
  67 /*
  68  * Time the connection can be idle before we probe
  69  * it to see if we can still talk to the AP.
  70  */
  71 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  72 /*
  73  * Time we wait for a probe response after sending
  74  * a probe request because of beacon loss or for
  75  * checking the connection still works.
  76  */
  77 static int probe_wait_ms = 500;
  78 module_param(probe_wait_ms, int, 0644);
  79 MODULE_PARM_DESC(probe_wait_ms,
  80                  "Maximum time(ms) to wait for probe response"
  81                  " before disconnecting (reason 4).");
  82
  83 /*
  84  * How many Beacon frames need to have been used in average signal strength
  85  * before starting to indicate signal change events.
  86  */
  87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  88
  89 /*
  90  * We can have multiple work items (and connection probing)
  91  * scheduling this timer, but we need to take care to only
  92  * reschedule it when it should fire _earlier_ than it was
  93  * asked for before, or if it's not pending right now. This
  94  * function ensures that. Note that it then is required to
  95  * run this function for all timeouts after the first one
  96  * has happened -- the work that runs from this timer will
  97  * do that.
  98  */
  99 static void run_again(struct ieee80211_sub_if_data *sdata,
 100                       unsigned long timeout)
 101 {
 102         sdata_assert_lock(sdata);
 103
 104         if (!timer_pending(&sdata->u.mgd.timer) ||
 105             time_before(timeout, sdata->u.mgd.timer.expires))
 106                 mod_timer(&sdata->u.mgd.timer, timeout);
 107 }
 108
 109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 110 {
 111         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 112                 return;
 113
 114         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 119 }
 120
 121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 122 {
 123         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 124
 125         if (unlikely(!sdata->u.mgd.associated))
 126                 return;
 127
 128         ifmgd->probe_send_count = 0;
 129
 130         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 131                 return;
 132
 133         mod_timer(&sdata->u.mgd.conn_mon_timer,
 134                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 135 }
 136
 137 static int ecw2cw(int ecw)
 138 {
 139         return (1 << ecw) - 1;
 140 }
 141
 142 static u32
 143 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 144                              struct ieee80211_supported_band *sband,
 145                              struct ieee80211_channel *channel,
 146                              const struct ieee80211_ht_cap *ht_cap,
 147                              const struct ieee80211_ht_operation *ht_oper,
 148                              const struct ieee80211_vht_operation *vht_oper,
 149                              struct cfg80211_chan_def *chandef, bool tracking)
 150 {
 151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 152         struct cfg80211_chan_def vht_chandef;
 153         struct ieee80211_sta_ht_cap sta_ht_cap;
 154         u32 ht_cfreq, ret;
 155
 156         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 157         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 158
 159         chandef->chan = channel;
 160         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 161         chandef->center_freq1 = channel->center_freq;
 162         chandef->center_freq2 = 0;
 163
 164         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 165                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 166                 goto out;
 167         }
 168
 169         chandef->width = NL80211_CHAN_WIDTH_20;
 170
 171         if (!(ht_cap->cap_info &
 172               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 173                 ret = IEEE80211_STA_DISABLE_40MHZ;
 174                 vht_chandef = *chandef;
 175                 goto out;
 176         }
 177
 178         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 179                                                   channel->band);
 180         /* check that channel matches the right operating channel */
 181         if (!tracking && channel->center_freq != ht_cfreq) {
 182                 /*
 183                  * It's possible that some APs are confused here;
 184                  * Netgear WNDR3700 sometimes reports 4 higher than
 185                  * the actual channel in association responses, but
 186                  * since we look at probe response/beacon data here
 187                  * it should be OK.
 188                  */
 189                 sdata_info(sdata,
 190                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 191                            channel->center_freq, ht_cfreq,
 192                            ht_oper->primary_chan, channel->band);
 193                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 194                 goto out;
 195         }
 196
 197         /* check 40 MHz support, if we have it */
 198         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 199                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 200                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 201                         chandef->width = NL80211_CHAN_WIDTH_40;
 202                         chandef->center_freq1 += 10;
 203                         break;
 204                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 205                         chandef->width = NL80211_CHAN_WIDTH_40;
 206                         chandef->center_freq1 -= 10;
 207                         break;
 208                 }
 209         } else {
 210                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 211                 ret = IEEE80211_STA_DISABLE_VHT;
 212                 /* also mark 40 MHz disabled */
 213                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 214                 goto out;
 215         }
 216
 217         if (!vht_oper || !sband->vht_cap.vht_supported) {
 218                 ret = IEEE80211_STA_DISABLE_VHT;
 219                 goto out;
 220         }
 221
 222         vht_chandef.chan = channel;
 223         vht_chandef.center_freq1 =
 224                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 225                                                channel->band);
 226         vht_chandef.center_freq2 = 0;
 227
 228         switch (vht_oper->chan_width) {
 229         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 230                 vht_chandef.width = chandef->width;
 231                 vht_chandef.center_freq1 = chandef->center_freq1;
 232                 break;
 233         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 234                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 235                 break;
 236         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 237                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 238                 break;
 239         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 240                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 241                 vht_chandef.center_freq2 =
 242                         ieee80211_channel_to_frequency(
 243                                 vht_oper->center_freq_seg2_idx,
 244                                 channel->band);
 245                 break;
 246         default:
 247                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 248                         sdata_info(sdata,
 249                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 250                                    vht_oper->chan_width);
 251                 ret = IEEE80211_STA_DISABLE_VHT;
 252                 goto out;
 253         }
 254
 255         if (!cfg80211_chandef_valid(&vht_chandef)) {
 256                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 257                         sdata_info(sdata,
 258                                    "AP VHT information is invalid, disable VHT\n");
 259                 ret = IEEE80211_STA_DISABLE_VHT;
 260                 goto out;
 261         }
 262
 263         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 264                 ret = 0;
 265                 goto out;
 266         }
 267
 268         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 269                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 270                         sdata_info(sdata,
 271                                    "AP VHT information doesn't match HT, disable VHT\n");
 272                 ret = IEEE80211_STA_DISABLE_VHT;
 273                 goto out;
 274         }
 275
 276         *chandef = vht_chandef;
 277
 278         ret = 0;
 279
 280 out:
 281         /*
 282          * When tracking the current AP, don't do any further checks if the
 283          * new chandef is identical to the one we're currently using for the
 284          * connection. This keeps us from playing ping-pong with regulatory,
 285          * without it the following can happen (for example):
 286          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 287          *  - AP advertises regdom US
 288          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 289          *  - the code below detects an unsupported channel, downgrades, and
 290          *    we disconnect from the AP in the caller
 291          *  - disconnect causes CRDA to reload world regdomain and the game
 292          *    starts anew.
 293          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 294          *
 295          * It seems possible that there are still scenarios with CSA or real
 296          * bandwidth changes where a this could happen, but those cases are
 297          * less common and wouldn't completely prevent using the AP.
 298          */
 299         if (tracking &&
 300             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 301                 return ret;
 302
 303         /* don't print the message below for VHT mismatch if VHT is disabled */
 304         if (ret & IEEE80211_STA_DISABLE_VHT)
 305                 vht_chandef = *chandef;
 306
 307         /*
 308          * Ignore the DISABLED flag when we're already connected and only
 309          * tracking the APs beacon for bandwidth changes - otherwise we
 310          * might get disconnected here if we connect to an AP, update our
 311          * regulatory information based on the AP's country IE and the
 312          * information we have is wrong/outdated and disables the channel
 313          * that we're actually using for the connection to the AP.
 314          */
 315         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 316                                         tracking ? 0 :
 317                                                    IEEE80211_CHAN_DISABLED)) {
 318                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 319                         ret = IEEE80211_STA_DISABLE_HT |
 320                               IEEE80211_STA_DISABLE_VHT;
 321                         break;
 322                 }
 323
 324                 ret |= ieee80211_chandef_downgrade(chandef);
 325         }
 326
 327         if (chandef->width != vht_chandef.width && !tracking)
 328                 sdata_info(sdata,
 329                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 330
 331         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 332         return ret;
 333 }
 334
 335 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 336                                struct sta_info *sta,
 337                                const struct ieee80211_ht_cap *ht_cap,
 338                                const struct ieee80211_ht_operation *ht_oper,
 339                                const struct ieee80211_vht_operation *vht_oper,
 340                                const u8 *bssid, u32 *changed)
 341 {
 342         struct ieee80211_local *local = sdata->local;
 343         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 344         struct ieee80211_supported_band *sband;
 345         struct ieee80211_channel *chan;
 346         struct cfg80211_chan_def chandef;
 347         u16 ht_opmode;
 348         u32 flags;
 349         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 350         int ret;
 351
 352         /* if HT was/is disabled, don't track any bandwidth changes */
 353         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 354                 return 0;
 355
 356         /* don't check VHT if we associated as non-VHT station */
 357         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 358                 vht_oper = NULL;
 359
 360         if (WARN_ON_ONCE(!sta))
 361                 return -EINVAL;
 362
 363         /*
 364          * if bss configuration changed store the new one -
 365          * this may be applicable even if channel is identical
 366          */
 367         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 368         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 369                 *changed |= BSS_CHANGED_HT;
 370                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 371         }
 372
 373         chan = sdata->vif.bss_conf.chandef.chan;
 374         sband = local->hw.wiphy->bands[chan->band];
 375
 376         /* calculate new channel (type) based on HT/VHT operation IEs */
 377         flags = ieee80211_determine_chantype(sdata, sband, chan,
 378                                              ht_cap, ht_oper, vht_oper,
 379                                              &chandef, true);
 380
 381         /*
 382          * Downgrade the new channel if we associated with restricted
 383          * capabilities. For example, if we associated as a 20 MHz STA
 384          * to a 40 MHz AP (due to regulatory, capabilities or config
 385          * reasons) then switching to a 40 MHz channel now won't do us
 386          * any good -- we couldn't use it with the AP.
 387          */
 388         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 389             chandef.width == NL80211_CHAN_WIDTH_80P80)
 390                 flags |= ieee80211_chandef_downgrade(&chandef);
 391         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 392             chandef.width == NL80211_CHAN_WIDTH_160)
 393                 flags |= ieee80211_chandef_downgrade(&chandef);
 394         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 395             chandef.width > NL80211_CHAN_WIDTH_20)
 396                 flags |= ieee80211_chandef_downgrade(&chandef);
 397
 398         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 399                 return 0;
 400
 401         sdata_info(sdata,
 402                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 403                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 404                    chandef.center_freq1, chandef.center_freq2);
 405
 406         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 407                                       IEEE80211_STA_DISABLE_VHT |
 408                                       IEEE80211_STA_DISABLE_40MHZ |
 409                                       IEEE80211_STA_DISABLE_80P80MHZ |
 410                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 411             !cfg80211_chandef_valid(&chandef)) {
 412                 sdata_info(sdata,
 413                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 414                            ifmgd->bssid);
 415                 return -EINVAL;
 416         }
 417
 418         switch (chandef.width) {
 419         case NL80211_CHAN_WIDTH_20_NOHT:
 420         case NL80211_CHAN_WIDTH_20:
 421                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 422                 break;
 423         case NL80211_CHAN_WIDTH_40:
 424                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 425                 break;
 426         case NL80211_CHAN_WIDTH_80:
 427                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 428                 break;
 429         case NL80211_CHAN_WIDTH_80P80:
 430         case NL80211_CHAN_WIDTH_160:
 431                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 432                 break;
 433         default:
 434                 return -EINVAL;
 435         }
 436
 437         if (new_sta_bw > sta->cur_max_bandwidth)
 438                 new_sta_bw = sta->cur_max_bandwidth;
 439
 440         if (new_sta_bw < sta->sta.bandwidth) {
 441                 sta->sta.bandwidth = new_sta_bw;
 442                 rate_control_rate_update(local, sband, sta,
 443                                          IEEE80211_RC_BW_CHANGED);
 444         }
 445
 446         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 447         if (ret) {
 448                 sdata_info(sdata,
 449                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 450                            ifmgd->bssid);
 451                 return ret;
 452         }
 453
 454         if (new_sta_bw > sta->sta.bandwidth) {
 455                 sta->sta.bandwidth = new_sta_bw;
 456                 rate_control_rate_update(local, sband, sta,
 457                                          IEEE80211_RC_BW_CHANGED);
 458         }
 459
 460         return 0;
 461 }
 462
 463 /* frame sending functions */
 464
 465 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 466                                 struct sk_buff *skb, u8 ap_ht_param,
 467                                 struct ieee80211_supported_band *sband,
 468                                 struct ieee80211_channel *channel,
 469                                 enum ieee80211_smps_mode smps)
 470 {
 471         u8 *pos;
 472         u32 flags = channel->flags;
 473         u16 cap;
 474         struct ieee80211_sta_ht_cap ht_cap;
 475
 476         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 477
 478         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 479         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 480
 481         /* determine capability flags */
 482         cap = ht_cap.cap;
 483
 484         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 485         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 486                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 487                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 488                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 489                 }
 490                 break;
 491         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 492                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 493                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 494                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 495                 }
 496                 break;
 497         }
 498
 499         /*
 500          * If 40 MHz was disabled associate as though we weren't
 501          * capable of 40 MHz -- some broken APs will never fall
 502          * back to trying to transmit in 20 MHz.
 503          */
 504         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 505                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 506                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 507         }
 508
 509         /* set SM PS mode properly */
 510         cap &= ~IEEE80211_HT_CAP_SM_PS;
 511         switch (smps) {
 512         case IEEE80211_SMPS_AUTOMATIC:
 513         case IEEE80211_SMPS_NUM_MODES:
 514                 WARN_ON(1);
 515         case IEEE80211_SMPS_OFF:
 516                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 517                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 518                 break;
 519         case IEEE80211_SMPS_STATIC:
 520                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 521                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 522                 break;
 523         case IEEE80211_SMPS_DYNAMIC:
 524                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 525                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 526                 break;
 527         }
 528
 529         /* reserve and fill IE */
 530         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 531         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 532 }
 533
 534 /* This function determines vht capability flags for the association
 535  * and builds the IE.
 536  * Note - the function may set the owner of the MU-MIMO capability
 537  */
 538 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 539                                  struct sk_buff *skb,
 540                                  struct ieee80211_supported_band *sband,
 541                                  struct ieee80211_vht_cap *ap_vht_cap)
 542 {
 543         struct ieee80211_local *local = sdata->local;
 544         u8 *pos;
 545         u32 cap;
 546         struct ieee80211_sta_vht_cap vht_cap;
 547         u32 mask, ap_bf_sts, our_bf_sts;
 548
 549         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 550
 551         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 552         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 553
 554         /* determine capability flags */
 555         cap = vht_cap.cap;
 556
 557         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 558                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 559
 560                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 561                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 562                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 563                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 564         }
 565
 566         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 567                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 568                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 569         }
 570
 571         /*
 572          * Some APs apparently get confused if our capabilities are better
 573          * than theirs, so restrict what we advertise in the assoc request.
 574          */
 575         if (!(ap_vht_cap->vht_cap_info &
 576                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 577                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 578                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 579         else if (!(ap_vht_cap->vht_cap_info &
 580                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 581                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 582
 583         /*
 584          * If some other vif is using the MU-MIMO capablity we cannot associate
 585          * using MU-MIMO - this will lead to contradictions in the group-id
 586          * mechanism.
 587          * Ownership is defined since association request, in order to avoid
 588          * simultaneous associations with MU-MIMO.
 589          */
 590         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 591                 bool disable_mu_mimo = false;
 592                 struct ieee80211_sub_if_data *other;
 593
 594                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 595                         if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
 596                                 disable_mu_mimo = true;
 597                                 break;
 598                         }
 599                 }
 600                 if (disable_mu_mimo)
 601                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 602                 else
 603                         sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
 604         }
 605
 606         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 607
 608         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 609         our_bf_sts = cap & mask;
 610
 611         if (ap_bf_sts < our_bf_sts) {
 612                 cap &= ~mask;
 613                 cap |= ap_bf_sts;
 614         }
 615
 616         /* reserve and fill IE */
 617         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 618         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 619 }
 620
 621 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 622 {
 623         struct ieee80211_local *local = sdata->local;
 624         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 625         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 626         struct sk_buff *skb;
 627         struct ieee80211_mgmt *mgmt;
 628         u8 *pos, qos_info;
 629         size_t offset = 0, noffset;
 630         int i, count, rates_len, supp_rates_len, shift;
 631         u16 capab;
 632         struct ieee80211_supported_band *sband;
 633         struct ieee80211_chanctx_conf *chanctx_conf;
 634         struct ieee80211_channel *chan;
 635         u32 rate_flags, rates = 0;
 636
 637         sdata_assert_lock(sdata);
 638
 639         rcu_read_lock();
 640         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 641         if (WARN_ON(!chanctx_conf)) {
 642                 rcu_read_unlock();
 643                 return;
 644         }
 645         chan = chanctx_conf->def.chan;
 646         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 647         rcu_read_unlock();
 648         sband = local->hw.wiphy->bands[chan->band];
 649         shift = ieee80211_vif_get_shift(&sdata->vif);
 650
 651         if (assoc_data->supp_rates_len) {
 652                 /*
 653                  * Get all rates supported by the device and the AP as
 654                  * some APs don't like getting a superset of their rates
 655                  * in the association request (e.g. D-Link DAP 1353 in
 656                  * b-only mode)...
 657                  */
 658                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 659                                                      assoc_data->supp_rates,
 660                                                      assoc_data->supp_rates_len,
 661                                                      &rates);
 662         } else {
 663                 /*
 664                  * In case AP not provide any supported rates information
 665                  * before association, we send information element(s) with
 666                  * all rates that we support.
 667                  */
 668                 rates_len = 0;
 669                 for (i = 0; i < sband->n_bitrates; i++) {
 670                         if ((rate_flags & sband->bitrates[i].flags)
 671                             != rate_flags)
 672                                 continue;
 673                         rates |= BIT(i);
 674                         rates_len++;
 675                 }
 676         }
 677
 678         skb = alloc_skb(local->hw.extra_tx_headroom +
 679                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 680                         2 + assoc_data->ssid_len + /* SSID */
 681                         4 + rates_len + /* (extended) rates */
 682                         4 + /* power capability */
 683                         2 + 2 * sband->n_channels + /* supported channels */
 684                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 685                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 686                         assoc_data->ie_len + /* extra IEs */
 687                         9, /* WMM */
 688                         GFP_KERNEL);
 689         if (!skb)
 690                 return;
 691
 692         skb_reserve(skb, local->hw.extra_tx_headroom);
 693
 694         capab = WLAN_CAPABILITY_ESS;
 695
 696         if (sband->band == IEEE80211_BAND_2GHZ) {
 697                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 698                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 699         }
 700
 701         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 702                 capab |= WLAN_CAPABILITY_PRIVACY;
 703
 704         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 705             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 706                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 707
 708         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 709                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 710
 711         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 712         memset(mgmt, 0, 24);
 713         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 714         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 715         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 716
 717         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 718                 skb_put(skb, 10);
 719                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 720                                                   IEEE80211_STYPE_REASSOC_REQ);
 721                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 722                 mgmt->u.reassoc_req.listen_interval =
 723                                 cpu_to_le16(local->hw.conf.listen_interval);
 724                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 725                        ETH_ALEN);
 726         } else {
 727                 skb_put(skb, 4);
 728                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 729                                                   IEEE80211_STYPE_ASSOC_REQ);
 730                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 731                 mgmt->u.assoc_req.listen_interval =
 732                                 cpu_to_le16(local->hw.conf.listen_interval);
 733         }
 734
 735         /* SSID */
 736         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 737         *pos++ = WLAN_EID_SSID;
 738         *pos++ = assoc_data->ssid_len;
 739         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 740
 741         /* add all rates which were marked to be used above */
 742         supp_rates_len = rates_len;
 743         if (supp_rates_len > 8)
 744                 supp_rates_len = 8;
 745
 746         pos = skb_put(skb, supp_rates_len + 2);
 747         *pos++ = WLAN_EID_SUPP_RATES;
 748         *pos++ = supp_rates_len;
 749
 750         count = 0;
 751         for (i = 0; i < sband->n_bitrates; i++) {
 752                 if (BIT(i) & rates) {
 753                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 754                                                 5 * (1 << shift));
 755                         *pos++ = (u8) rate;
 756                         if (++count == 8)
 757                                 break;
 758                 }
 759         }
 760
 761         if (rates_len > count) {
 762                 pos = skb_put(skb, rates_len - count + 2);
 763                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 764                 *pos++ = rates_len - count;
 765
 766                 for (i++; i < sband->n_bitrates; i++) {
 767                         if (BIT(i) & rates) {
 768                                 int rate;
 769                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 770                                                     5 * (1 << shift));
 771                                 *pos++ = (u8) rate;
 772                         }
 773                 }
 774         }
 775
 776         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 777             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 778                 pos = skb_put(skb, 4);
 779                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 780                 *pos++ = 2;
 781                 *pos++ = 0; /* min tx power */
 782                  /* max tx power */
 783                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 784         }
 785
 786         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 787                 /* TODO: get this in reg domain format */
 788                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 789                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 790                 *pos++ = 2 * sband->n_channels;
 791                 for (i = 0; i < sband->n_channels; i++) {
 792                         *pos++ = ieee80211_frequency_to_channel(
 793                                         sband->channels[i].center_freq);
 794                         *pos++ = 1; /* one channel in the subband*/
 795                 }
 796         }
 797
 798         /* if present, add any custom IEs that go before HT */
 799         if (assoc_data->ie_len) {
 800                 static const u8 before_ht[] = {
 801                         WLAN_EID_SSID,
 802                         WLAN_EID_SUPP_RATES,
 803                         WLAN_EID_EXT_SUPP_RATES,
 804                         WLAN_EID_PWR_CAPABILITY,
 805                         WLAN_EID_SUPPORTED_CHANNELS,
 806                         WLAN_EID_RSN,
 807                         WLAN_EID_QOS_CAPA,
 808                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 809                         WLAN_EID_MOBILITY_DOMAIN,
 810                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 811                         WLAN_EID_RIC_DATA,              /* reassoc only */
 812                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 813                 };
 814                 static const u8 after_ric[] = {
 815                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 816                         WLAN_EID_HT_CAPABILITY,
 817                         WLAN_EID_BSS_COEX_2040,
 818                         WLAN_EID_EXT_CAPABILITY,
 819                         WLAN_EID_QOS_TRAFFIC_CAPA,
 820                         WLAN_EID_TIM_BCAST_REQ,
 821                         WLAN_EID_INTERWORKING,
 822                         /* 60GHz doesn't happen right now */
 823                         WLAN_EID_VHT_CAPABILITY,
 824                         WLAN_EID_OPMODE_NOTIF,
 825                 };
 826
 827                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 828                                                  assoc_data->ie_len,
 829                                                  before_ht,
 830                                                  ARRAY_SIZE(before_ht),
 831                                                  after_ric,
 832                                                  ARRAY_SIZE(after_ric),
 833                                                  offset);
 834                 pos = skb_put(skb, noffset - offset);
 835                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 836                 offset = noffset;
 837         }
 838
 839         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 840                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 841                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 842
 843         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 844                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 845                                     sband, chan, sdata->smps_mode);
 846
 847         /* if present, add any custom IEs that go before VHT */
 848         if (assoc_data->ie_len) {
 849                 static const u8 before_vht[] = {
 850                         WLAN_EID_SSID,
 851                         WLAN_EID_SUPP_RATES,
 852                         WLAN_EID_EXT_SUPP_RATES,
 853                         WLAN_EID_PWR_CAPABILITY,
 854                         WLAN_EID_SUPPORTED_CHANNELS,
 855                         WLAN_EID_RSN,
 856                         WLAN_EID_QOS_CAPA,
 857                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 858                         WLAN_EID_MOBILITY_DOMAIN,
 859                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 860                         WLAN_EID_HT_CAPABILITY,
 861                         WLAN_EID_BSS_COEX_2040,
 862                         WLAN_EID_EXT_CAPABILITY,
 863                         WLAN_EID_QOS_TRAFFIC_CAPA,
 864                         WLAN_EID_TIM_BCAST_REQ,
 865                         WLAN_EID_INTERWORKING,
 866                 };
 867
 868                 /* RIC already taken above, so no need to handle here anymore */
 869                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 870                                              before_vht, ARRAY_SIZE(before_vht),
 871                                              offset);
 872                 pos = skb_put(skb, noffset - offset);
 873                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 874                 offset = noffset;
 875         }
 876
 877         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 878                 ieee80211_add_vht_ie(sdata, skb, sband,
 879                                      &assoc_data->ap_vht_cap);
 880
 881         /* if present, add any custom non-vendor IEs that go after HT */
 882         if (assoc_data->ie_len) {
 883                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 884                                                     assoc_data->ie_len,
 885                                                     offset);
 886                 pos = skb_put(skb, noffset - offset);
 887                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 888                 offset = noffset;
 889         }
 890
 891         if (assoc_data->wmm) {
 892                 if (assoc_data->uapsd) {
 893                         qos_info = ifmgd->uapsd_queues;
 894                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 895                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 896                 } else {
 897                         qos_info = 0;
 898                 }
 899
 900                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 901         }
 902
 903         /* add any remaining custom (i.e. vendor specific here) IEs */
 904         if (assoc_data->ie_len) {
 905                 noffset = assoc_data->ie_len;
 906                 pos = skb_put(skb, noffset - offset);
 907                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 908         }
 909
 910         drv_mgd_prepare_tx(local, sdata);
 911
 912         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 913         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 914                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 915                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 916         ieee80211_tx_skb(sdata, skb);
 917 }
 918
 919 void ieee80211_send_pspoll(struct ieee80211_local *local,
 920                            struct ieee80211_sub_if_data *sdata)
 921 {
 922         struct ieee80211_pspoll *pspoll;
 923         struct sk_buff *skb;
 924
 925         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 926         if (!skb)
 927                 return;
 928
 929         pspoll = (struct ieee80211_pspoll *) skb->data;
 930         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 931
 932         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 933         ieee80211_tx_skb(sdata, skb);
 934 }
 935
 936 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 937                              struct ieee80211_sub_if_data *sdata,
 938                              bool powersave)
 939 {
 940         struct sk_buff *skb;
 941         struct ieee80211_hdr_3addr *nullfunc;
 942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 943
 944         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 945         if (!skb)
 946                 return;
 947
 948         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 949         if (powersave)
 950                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 951
 952         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 953                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 954
 955         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 956                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 957
 958         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 959                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 960
 961         ieee80211_tx_skb(sdata, skb);
 962 }
 963
 964 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 965                                           struct ieee80211_sub_if_data *sdata)
 966 {
 967         struct sk_buff *skb;
 968         struct ieee80211_hdr *nullfunc;
 969         __le16 fc;
 970
 971         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 972                 return;
 973
 974         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 975         if (!skb)
 976                 return;
 977
 978         skb_reserve(skb, local->hw.extra_tx_headroom);
 979
 980         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 981         memset(nullfunc, 0, 30);
 982         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 983                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 984         nullfunc->frame_control = fc;
 985         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 986         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 987         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 988         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 989
 990         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 991         ieee80211_tx_skb(sdata, skb);
 992 }
 993
 994 /* spectrum management related things */
 995 static void ieee80211_chswitch_work(struct work_struct *work)
 996 {
 997         struct ieee80211_sub_if_data *sdata =
 998                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 999         struct ieee80211_local *local = sdata->local;
1000         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1001         int ret;
1002
1003         if (!ieee80211_sdata_running(sdata))
1004                 return;
1005
1006         sdata_lock(sdata);
1007         mutex_lock(&local->mtx);
1008         mutex_lock(&local->chanctx_mtx);
1009
1010         if (!ifmgd->associated)
1011                 goto out;
1012
1013         if (!sdata->vif.csa_active)
1014                 goto out;
1015
1016         /*
1017          * using reservation isn't immediate as it may be deferred until later
1018          * with multi-vif. once reservation is complete it will re-schedule the
1019          * work with no reserved_chanctx so verify chandef to check if it
1020          * completed successfully
1021          */
1022
1023         if (sdata->reserved_chanctx) {
1024                 /*
1025                  * with multi-vif csa driver may call ieee80211_csa_finish()
1026                  * many times while waiting for other interfaces to use their
1027                  * reservations
1028                  */
1029                 if (sdata->reserved_ready)
1030                         goto out;
1031
1032                 ret = ieee80211_vif_use_reserved_context(sdata);
1033                 if (ret) {
1034                         sdata_info(sdata,
1035                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1036                                    ret);
1037                         ieee80211_queue_work(&sdata->local->hw,
1038                                              &ifmgd->csa_connection_drop_work);
1039                         goto out;
1040                 }
1041
1042                 goto out;
1043         }
1044
1045         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1046                                         &sdata->csa_chandef)) {
1047                 sdata_info(sdata,
1048                            "failed to finalize channel switch, disconnecting\n");
1049                 ieee80211_queue_work(&sdata->local->hw,
1050                                      &ifmgd->csa_connection_drop_work);
1051                 goto out;
1052         }
1053
1054         /* XXX: shouldn't really modify cfg80211-owned data! */
1055         ifmgd->associated->channel = sdata->csa_chandef.chan;
1056
1057         ifmgd->csa_waiting_bcn = true;
1058
1059         ieee80211_sta_reset_beacon_monitor(sdata);
1060         ieee80211_sta_reset_conn_monitor(sdata);
1061
1062 out:
1063         mutex_unlock(&local->chanctx_mtx);
1064         mutex_unlock(&local->mtx);
1065         sdata_unlock(sdata);
1066 }
1067
1068 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1069 {
1070         struct ieee80211_local *local = sdata->local;
1071         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1072         int ret;
1073
1074         sdata_assert_lock(sdata);
1075
1076         WARN_ON(!sdata->vif.csa_active);
1077
1078         if (sdata->csa_block_tx) {
1079                 ieee80211_wake_vif_queues(local, sdata,
1080                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1081                 sdata->csa_block_tx = false;
1082         }
1083
1084         sdata->vif.csa_active = false;
1085         ifmgd->csa_waiting_bcn = false;
1086
1087         ret = drv_post_channel_switch(sdata);
1088         if (ret) {
1089                 sdata_info(sdata,
1090                            "driver post channel switch failed, disconnecting\n");
1091                 ieee80211_queue_work(&local->hw,
1092                                      &ifmgd->csa_connection_drop_work);
1093                 return;
1094         }
1095
1096         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1097 }
1098
1099 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1100 {
1101         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1102         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1103
1104         trace_api_chswitch_done(sdata, success);
1105         if (!success) {
1106                 sdata_info(sdata,
1107                            "driver channel switch failed, disconnecting\n");
1108                 ieee80211_queue_work(&sdata->local->hw,
1109                                      &ifmgd->csa_connection_drop_work);
1110         } else {
1111                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1112         }
1113 }
1114 EXPORT_SYMBOL(ieee80211_chswitch_done);
1115
1116 static void ieee80211_chswitch_timer(unsigned long data)
1117 {
1118         struct ieee80211_sub_if_data *sdata =
1119                 (struct ieee80211_sub_if_data *) data;
1120
1121         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1122 }
1123
1124 static void
1125 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1126                                  u64 timestamp, u32 device_timestamp,
1127                                  struct ieee802_11_elems *elems,
1128                                  bool beacon)
1129 {
1130         struct ieee80211_local *local = sdata->local;
1131         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1132         struct cfg80211_bss *cbss = ifmgd->associated;
1133         struct ieee80211_chanctx_conf *conf;
1134         struct ieee80211_chanctx *chanctx;
1135         enum ieee80211_band current_band;
1136         struct ieee80211_csa_ie csa_ie;
1137         struct ieee80211_channel_switch ch_switch;
1138         int res;
1139
1140         sdata_assert_lock(sdata);
1141
1142         if (!cbss)
1143                 return;
1144
1145         if (local->scanning)
1146                 return;
1147
1148         /* disregard subsequent announcements if we are already processing */
1149         if (sdata->vif.csa_active)
1150                 return;
1151
1152         current_band = cbss->channel->band;
1153         memset(&csa_ie, 0, sizeof(csa_ie));
1154         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1155                                            ifmgd->flags,
1156                                            ifmgd->associated->bssid, &csa_ie);
1157         if (res < 0)
1158                 ieee80211_queue_work(&local->hw,
1159                                      &ifmgd->csa_connection_drop_work);
1160         if (res)
1161                 return;
1162
1163         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1164                                      IEEE80211_CHAN_DISABLED)) {
1165                 sdata_info(sdata,
1166                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1167                            ifmgd->associated->bssid,
1168                            csa_ie.chandef.chan->center_freq,
1169                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1170                            csa_ie.chandef.center_freq2);
1171                 ieee80211_queue_work(&local->hw,
1172                                      &ifmgd->csa_connection_drop_work);
1173                 return;
1174         }
1175
1176         if (cfg80211_chandef_identical(&csa_ie.chandef,
1177                                        &sdata->vif.bss_conf.chandef)) {
1178                 if (ifmgd->csa_ignored_same_chan)
1179                         return;
1180                 sdata_info(sdata,
1181                            "AP %pM tries to chanswitch to same channel, ignore\n",
1182                            ifmgd->associated->bssid);
1183                 ifmgd->csa_ignored_same_chan = true;
1184                 return;
1185         }
1186
1187         /*
1188          * Drop all TDLS peers - either we disconnect or move to a different
1189          * channel from this point on. There's no telling what our peer will do.
1190          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1191          * have an incompatible wider chandef.
1192          */
1193         ieee80211_teardown_tdls_peers(sdata);
1194
1195         mutex_lock(&local->mtx);
1196         mutex_lock(&local->chanctx_mtx);
1197         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1198                                          lockdep_is_held(&local->chanctx_mtx));
1199         if (!conf) {
1200                 sdata_info(sdata,
1201                            "no channel context assigned to vif?, disconnecting\n");
1202                 goto drop_connection;
1203         }
1204
1205         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1206
1207         if (local->use_chanctx &&
1208             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1209                 sdata_info(sdata,
1210                            "driver doesn't support chan-switch with channel contexts\n");
1211                 goto drop_connection;
1212         }
1213
1214         ch_switch.timestamp = timestamp;
1215         ch_switch.device_timestamp = device_timestamp;
1216         ch_switch.block_tx = csa_ie.mode;
1217         ch_switch.chandef = csa_ie.chandef;
1218         ch_switch.count = csa_ie.count;
1219
1220         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1221                 sdata_info(sdata,
1222                            "preparing for channel switch failed, disconnecting\n");
1223                 goto drop_connection;
1224         }
1225
1226         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1227                                             chanctx->mode, false);
1228         if (res) {
1229                 sdata_info(sdata,
1230                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1231                            res);
1232                 goto drop_connection;
1233         }
1234         mutex_unlock(&local->chanctx_mtx);
1235
1236         sdata->vif.csa_active = true;
1237         sdata->csa_chandef = csa_ie.chandef;
1238         sdata->csa_block_tx = csa_ie.mode;
1239         ifmgd->csa_ignored_same_chan = false;
1240
1241         if (sdata->csa_block_tx)
1242                 ieee80211_stop_vif_queues(local, sdata,
1243                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1244         mutex_unlock(&local->mtx);
1245
1246         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1247                                           csa_ie.count);
1248
1249         if (local->ops->channel_switch) {
1250                 /* use driver's channel switch callback */
1251                 drv_channel_switch(local, sdata, &ch_switch);
1252                 return;
1253         }
1254
1255         /* channel switch handled in software */
1256         if (csa_ie.count <= 1)
1257                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1258         else
1259                 mod_timer(&ifmgd->chswitch_timer,
1260                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1261                                          cbss->beacon_interval));
1262         return;
1263  drop_connection:
1264         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1265         mutex_unlock(&local->chanctx_mtx);
1266         mutex_unlock(&local->mtx);
1267 }
1268
1269 static bool
1270 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1271                                  struct ieee80211_channel *channel,
1272                                  const u8 *country_ie, u8 country_ie_len,
1273                                  const u8 *pwr_constr_elem,
1274                                  int *chan_pwr, int *pwr_reduction)
1275 {
1276         struct ieee80211_country_ie_triplet *triplet;
1277         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1278         int i, chan_increment;
1279         bool have_chan_pwr = false;
1280
1281         /* Invalid IE */
1282         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1283                 return false;
1284
1285         triplet = (void *)(country_ie + 3);
1286         country_ie_len -= 3;
1287
1288         switch (channel->band) {
1289         default:
1290                 WARN_ON_ONCE(1);
1291                 /* fall through */
1292         case IEEE80211_BAND_2GHZ:
1293         case IEEE80211_BAND_60GHZ:
1294                 chan_increment = 1;
1295                 break;
1296         case IEEE80211_BAND_5GHZ:
1297                 chan_increment = 4;
1298                 break;
1299         }
1300
1301         /* find channel */
1302         while (country_ie_len >= 3) {
1303                 u8 first_channel = triplet->chans.first_channel;
1304
1305                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1306                         goto next;
1307
1308                 for (i = 0; i < triplet->chans.num_channels; i++) {
1309                         if (first_channel + i * chan_increment == chan) {
1310                                 have_chan_pwr = true;
1311                                 *chan_pwr = triplet->chans.max_power;
1312                                 break;
1313                         }
1314                 }
1315                 if (have_chan_pwr)
1316                         break;
1317
1318  next:
1319                 triplet++;
1320                 country_ie_len -= 3;
1321         }
1322
1323         if (have_chan_pwr && pwr_constr_elem)
1324                 *pwr_reduction = *pwr_constr_elem;
1325         else
1326                 *pwr_reduction = 0;
1327
1328         return have_chan_pwr;
1329 }
1330
1331 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1332                                       struct ieee80211_channel *channel,
1333                                       const u8 *cisco_dtpc_ie,
1334                                       int *pwr_level)
1335 {
1336         /* From practical testing, the first data byte of the DTPC element
1337          * seems to contain the requested dBm level, and the CLI on Cisco
1338          * APs clearly state the range is -127 to 127 dBm, which indicates
1339          * a signed byte, although it seemingly never actually goes negative.
1340          * The other byte seems to always be zero.
1341          */
1342         *pwr_level = (__s8)cisco_dtpc_ie[4];
1343 }
1344
1345 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1346                                        struct ieee80211_channel *channel,
1347                                        struct ieee80211_mgmt *mgmt,
1348                                        const u8 *country_ie, u8 country_ie_len,
1349                                        const u8 *pwr_constr_ie,
1350                                        const u8 *cisco_dtpc_ie)
1351 {
1352         bool has_80211h_pwr = false, has_cisco_pwr = false;
1353         int chan_pwr = 0, pwr_reduction_80211h = 0;
1354         int pwr_level_cisco, pwr_level_80211h;
1355         int new_ap_level;
1356         __le16 capab = mgmt->u.probe_resp.capab_info;
1357
1358         if (country_ie &&
1359             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1360              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1361                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1362                         sdata, channel, country_ie, country_ie_len,
1363                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1364                 pwr_level_80211h =
1365                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1366         }
1367
1368         if (cisco_dtpc_ie) {
1369                 ieee80211_find_cisco_dtpc(
1370                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1371                 has_cisco_pwr = true;
1372         }
1373
1374         if (!has_80211h_pwr && !has_cisco_pwr)
1375                 return 0;
1376
1377         /* If we have both 802.11h and Cisco DTPC, apply both limits
1378          * by picking the smallest of the two power levels advertised.
1379          */
1380         if (has_80211h_pwr &&
1381             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1382                 sdata_dbg(sdata,
1383                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1384                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1385                           sdata->u.mgd.bssid);
1386                 new_ap_level = pwr_level_80211h;
1387         } else {  /* has_cisco_pwr is always true here. */
1388                 sdata_dbg(sdata,
1389                           "Limiting TX power to %d dBm as advertised by %pM\n",
1390                           pwr_level_cisco, sdata->u.mgd.bssid);
1391                 new_ap_level = pwr_level_cisco;
1392         }
1393
1394         if (sdata->ap_power_level == new_ap_level)
1395                 return 0;
1396
1397         sdata->ap_power_level = new_ap_level;
1398         if (__ieee80211_recalc_txpower(sdata))
1399                 return BSS_CHANGED_TXPOWER;
1400         return 0;
1401 }
1402
1403 /* powersave */
1404 static void ieee80211_enable_ps(struct ieee80211_local *local,
1405                                 struct ieee80211_sub_if_data *sdata)
1406 {
1407         struct ieee80211_conf *conf = &local->hw.conf;
1408
1409         /*
1410          * If we are scanning right now then the parameters will
1411          * take effect when scan finishes.
1412          */
1413         if (local->scanning)
1414                 return;
1415
1416         if (conf->dynamic_ps_timeout > 0 &&
1417             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1418                 mod_timer(&local->dynamic_ps_timer, jiffies +
1419                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1420         } else {
1421                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1422                         ieee80211_send_nullfunc(local, sdata, true);
1423
1424                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1425                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1426                         return;
1427
1428                 conf->flags |= IEEE80211_CONF_PS;
1429                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1430         }
1431 }
1432
1433 static void ieee80211_change_ps(struct ieee80211_local *local)
1434 {
1435         struct ieee80211_conf *conf = &local->hw.conf;
1436
1437         if (local->ps_sdata) {
1438                 ieee80211_enable_ps(local, local->ps_sdata);
1439         } else if (conf->flags & IEEE80211_CONF_PS) {
1440                 conf->flags &= ~IEEE80211_CONF_PS;
1441                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1442                 del_timer_sync(&local->dynamic_ps_timer);
1443                 cancel_work_sync(&local->dynamic_ps_enable_work);
1444         }
1445 }
1446
1447 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1448 {
1449         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1450         struct sta_info *sta = NULL;
1451         bool authorized = false;
1452
1453         if (!mgd->powersave)
1454                 return false;
1455
1456         if (mgd->broken_ap)
1457                 return false;
1458
1459         if (!mgd->associated)
1460                 return false;
1461
1462         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1463                 return false;
1464
1465         if (!mgd->have_beacon)
1466                 return false;
1467
1468         rcu_read_lock();
1469         sta = sta_info_get(sdata, mgd->bssid);
1470         if (sta)
1471                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1472         rcu_read_unlock();
1473
1474         return authorized;
1475 }
1476
1477 /* need to hold RTNL or interface lock */
1478 void ieee80211_recalc_ps(struct ieee80211_local *local)
1479 {
1480         struct ieee80211_sub_if_data *sdata, *found = NULL;
1481         int count = 0;
1482         int timeout;
1483
1484         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1485                 local->ps_sdata = NULL;
1486                 return;
1487         }
1488
1489         list_for_each_entry(sdata, &local->interfaces, list) {
1490                 if (!ieee80211_sdata_running(sdata))
1491                         continue;
1492                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1493                         /* If an AP vif is found, then disable PS
1494                          * by setting the count to zero thereby setting
1495                          * ps_sdata to NULL.
1496                          */
1497                         count = 0;
1498                         break;
1499                 }
1500                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1501                         continue;
1502                 found = sdata;
1503                 count++;
1504         }
1505
1506         if (count == 1 && ieee80211_powersave_allowed(found)) {
1507                 u8 dtimper = found->u.mgd.dtim_period;
1508                 s32 beaconint_us;
1509
1510                 beaconint_us = ieee80211_tu_to_usec(
1511                                         found->vif.bss_conf.beacon_int);
1512
1513                 timeout = local->dynamic_ps_forced_timeout;
1514                 if (timeout < 0)
1515                         timeout = 100;
1516                 local->hw.conf.dynamic_ps_timeout = timeout;
1517
1518                 /* If the TIM IE is invalid, pretend the value is 1 */
1519                 if (!dtimper)
1520                         dtimper = 1;
1521
1522                 local->hw.conf.ps_dtim_period = dtimper;
1523                 local->ps_sdata = found;
1524         } else {
1525                 local->ps_sdata = NULL;
1526         }
1527
1528         ieee80211_change_ps(local);
1529 }
1530
1531 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1532 {
1533         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1534
1535         if (sdata->vif.bss_conf.ps != ps_allowed) {
1536                 sdata->vif.bss_conf.ps = ps_allowed;
1537                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1538         }
1539 }
1540
1541 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1542 {
1543         struct ieee80211_local *local =
1544                 container_of(work, struct ieee80211_local,
1545                              dynamic_ps_disable_work);
1546
1547         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1548                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1549                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1550         }
1551
1552         ieee80211_wake_queues_by_reason(&local->hw,
1553                                         IEEE80211_MAX_QUEUE_MAP,
1554                                         IEEE80211_QUEUE_STOP_REASON_PS,
1555                                         false);
1556 }
1557
1558 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1559 {
1560         struct ieee80211_local *local =
1561                 container_of(work, struct ieee80211_local,
1562                              dynamic_ps_enable_work);
1563         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1564         struct ieee80211_if_managed *ifmgd;
1565         unsigned long flags;
1566         int q;
1567
1568         /* can only happen when PS was just disabled anyway */
1569         if (!sdata)
1570                 return;
1571
1572         ifmgd = &sdata->u.mgd;
1573
1574         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1575                 return;
1576
1577         if (local->hw.conf.dynamic_ps_timeout > 0) {
1578                 /* don't enter PS if TX frames are pending */
1579                 if (drv_tx_frames_pending(local)) {
1580                         mod_timer(&local->dynamic_ps_timer, jiffies +
1581                                   msecs_to_jiffies(
1582                                   local->hw.conf.dynamic_ps_timeout));
1583                         return;
1584                 }
1585
1586                 /*
1587                  * transmission can be stopped by others which leads to
1588                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1589                  * is not the actual idle state.
1590                  */
1591                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1592                 for (q = 0; q < local->hw.queues; q++) {
1593                         if (local->queue_stop_reasons[q]) {
1594                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1595                                                        flags);
1596                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1597                                           msecs_to_jiffies(
1598                                           local->hw.conf.dynamic_ps_timeout));
1599                                 return;
1600                         }
1601                 }
1602                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1603         }
1604
1605         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1606             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1607                 if (drv_tx_frames_pending(local)) {
1608                         mod_timer(&local->dynamic_ps_timer, jiffies +
1609                                   msecs_to_jiffies(
1610                                   local->hw.conf.dynamic_ps_timeout));
1611                 } else {
1612                         ieee80211_send_nullfunc(local, sdata, true);
1613                         /* Flush to get the tx status of nullfunc frame */
1614                         ieee80211_flush_queues(local, sdata, false);
1615                 }
1616         }
1617
1618         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1619               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1620             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1621                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1622                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1623                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1624         }
1625 }
1626
1627 void ieee80211_dynamic_ps_timer(unsigned long data)
1628 {
1629         struct ieee80211_local *local = (void *) data;
1630
1631         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1632 }
1633
1634 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1635 {
1636         struct delayed_work *delayed_work =
1637                 container_of(work, struct delayed_work, work);
1638         struct ieee80211_sub_if_data *sdata =
1639                 container_of(delayed_work, struct ieee80211_sub_if_data,
1640                              dfs_cac_timer_work);
1641         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1642
1643         mutex_lock(&sdata->local->mtx);
1644         if (sdata->wdev.cac_started) {
1645                 ieee80211_vif_release_channel(sdata);
1646                 cfg80211_cac_event(sdata->dev, &chandef,
1647                                    NL80211_RADAR_CAC_FINISHED,
1648                                    GFP_KERNEL);
1649         }
1650         mutex_unlock(&sdata->local->mtx);
1651 }
1652
1653 static bool
1654 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1655 {
1656         struct ieee80211_local *local = sdata->local;
1657         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1658         bool ret = false;
1659         int ac;
1660
1661         if (local->hw.queues < IEEE80211_NUM_ACS)
1662                 return false;
1663
1664         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1665                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1666                 int non_acm_ac;
1667                 unsigned long now = jiffies;
1668
1669                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1670                     tx_tspec->admitted_time &&
1671                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1672                         tx_tspec->consumed_tx_time = 0;
1673                         tx_tspec->time_slice_start = now;
1674
1675                         if (tx_tspec->downgraded)
1676                                 tx_tspec->action =
1677                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1678                 }
1679
1680                 switch (tx_tspec->action) {
1681                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1682                         /* take the original parameters */
1683                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1684                                 sdata_err(sdata,
1685                                           "failed to set TX queue parameters for queue %d\n",
1686                                           ac);
1687                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1688                         tx_tspec->downgraded = false;
1689                         ret = true;
1690                         break;
1691                 case TX_TSPEC_ACTION_DOWNGRADE:
1692                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1693                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1694                                 ret = true;
1695                                 break;
1696                         }
1697                         /* downgrade next lower non-ACM AC */
1698                         for (non_acm_ac = ac + 1;
1699                              non_acm_ac < IEEE80211_NUM_ACS;
1700                              non_acm_ac++)
1701                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1702                                         break;
1703                         /* The loop will result in using BK even if it requires
1704                          * admission control, such configuration makes no sense
1705                          * and we have to transmit somehow - the AC selection
1706                          * does the same thing.
1707                          */
1708                         if (drv_conf_tx(local, sdata, ac,
1709                                         &sdata->tx_conf[non_acm_ac]))
1710                                 sdata_err(sdata,
1711                                           "failed to set TX queue parameters for queue %d\n",
1712                                           ac);
1713                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1714                         ret = true;
1715                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1716                                 tx_tspec->time_slice_start + HZ - now + 1);
1717                         break;
1718                 case TX_TSPEC_ACTION_NONE:
1719                         /* nothing now */
1720                         break;
1721                 }
1722         }
1723
1724         return ret;
1725 }
1726
1727 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1728 {
1729         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1730                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1731 }
1732
1733 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1734 {
1735         struct ieee80211_sub_if_data *sdata;
1736
1737         sdata = container_of(work, struct ieee80211_sub_if_data,
1738                              u.mgd.tx_tspec_wk.work);
1739         ieee80211_sta_handle_tspec_ac_params(sdata);
1740 }
1741
1742 /* MLME */
1743 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1744                                      struct ieee80211_sub_if_data *sdata,
1745                                      const u8 *wmm_param, size_t wmm_param_len)
1746 {
1747         struct ieee80211_tx_queue_params params;
1748         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1749         size_t left;
1750         int count;
1751         const u8 *pos;
1752         u8 uapsd_queues = 0;
1753
1754         if (!local->ops->conf_tx)
1755                 return false;
1756
1757         if (local->hw.queues < IEEE80211_NUM_ACS)
1758                 return false;
1759
1760         if (!wmm_param)
1761                 return false;
1762
1763         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1764                 return false;
1765
1766         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1767                 uapsd_queues = ifmgd->uapsd_queues;
1768
1769         count = wmm_param[6] & 0x0f;
1770         if (count == ifmgd->wmm_last_param_set)
1771                 return false;
1772         ifmgd->wmm_last_param_set = count;
1773
1774         pos = wmm_param + 8;
1775         left = wmm_param_len - 8;
1776
1777         memset(&params, 0, sizeof(params));
1778
1779         sdata->wmm_acm = 0;
1780         for (; left >= 4; left -= 4, pos += 4) {
1781                 int aci = (pos[0] >> 5) & 0x03;
1782                 int acm = (pos[0] >> 4) & 0x01;
1783                 bool uapsd = false;
1784                 int queue;
1785
1786                 switch (aci) {
1787                 case 1: /* AC_BK */
1788                         queue = 3;
1789                         if (acm)
1790                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1791                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1792                                 uapsd = true;
1793                         break;
1794                 case 2: /* AC_VI */
1795                         queue = 1;
1796                         if (acm)
1797                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1798                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1799                                 uapsd = true;
1800                         break;
1801                 case 3: /* AC_VO */
1802                         queue = 0;
1803                         if (acm)
1804                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1805                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1806                                 uapsd = true;
1807                         break;
1808                 case 0: /* AC_BE */
1809                 default:
1810                         queue = 2;
1811                         if (acm)
1812                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1813                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1814                                 uapsd = true;
1815                         break;
1816                 }
1817
1818                 params.aifs = pos[0] & 0x0f;
1819                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1820                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1821                 params.txop = get_unaligned_le16(pos + 2);
1822                 params.acm = acm;
1823                 params.uapsd = uapsd;
1824
1825                 mlme_dbg(sdata,
1826                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1827                          queue, aci, acm,
1828                          params.aifs, params.cw_min, params.cw_max,
1829                          params.txop, params.uapsd,
1830                          ifmgd->tx_tspec[queue].downgraded);
1831                 sdata->tx_conf[queue] = params;
1832                 if (!ifmgd->tx_tspec[queue].downgraded &&
1833                     drv_conf_tx(local, sdata, queue, &params))
1834                         sdata_err(sdata,
1835                                   "failed to set TX queue parameters for queue %d\n",
1836                                   queue);
1837         }
1838
1839         /* enable WMM or activate new settings */
1840         sdata->vif.bss_conf.qos = true;
1841         return true;
1842 }
1843
1844 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1845 {
1846         lockdep_assert_held(&sdata->local->mtx);
1847
1848         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1849         ieee80211_run_deferred_scan(sdata->local);
1850 }
1851
1852 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1853 {
1854         mutex_lock(&sdata->local->mtx);
1855         __ieee80211_stop_poll(sdata);
1856         mutex_unlock(&sdata->local->mtx);
1857 }
1858
1859 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1860                                            u16 capab, bool erp_valid, u8 erp)
1861 {
1862         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1863         u32 changed = 0;
1864         bool use_protection;
1865         bool use_short_preamble;
1866         bool use_short_slot;
1867
1868         if (erp_valid) {
1869                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1870                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1871         } else {
1872                 use_protection = false;
1873                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1874         }
1875
1876         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1877         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1878                 use_short_slot = true;
1879
1880         if (use_protection != bss_conf->use_cts_prot) {
1881                 bss_conf->use_cts_prot = use_protection;
1882                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1883         }
1884
1885         if (use_short_preamble != bss_conf->use_short_preamble) {
1886                 bss_conf->use_short_preamble = use_short_preamble;
1887                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1888         }
1889
1890         if (use_short_slot != bss_conf->use_short_slot) {
1891                 bss_conf->use_short_slot = use_short_slot;
1892                 changed |= BSS_CHANGED_ERP_SLOT;
1893         }
1894
1895         return changed;
1896 }
1897
1898 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1899                                      struct cfg80211_bss *cbss,
1900                                      u32 bss_info_changed)
1901 {
1902         struct ieee80211_bss *bss = (void *)cbss->priv;
1903         struct ieee80211_local *local = sdata->local;
1904         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1905
1906         bss_info_changed |= BSS_CHANGED_ASSOC;
1907         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1908                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1909
1910         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1911                 beacon_loss_count * bss_conf->beacon_int));
1912
1913         sdata->u.mgd.associated = cbss;
1914         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1915
1916         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1917
1918         if (sdata->vif.p2p) {
1919                 const struct cfg80211_bss_ies *ies;
1920
1921                 rcu_read_lock();
1922                 ies = rcu_dereference(cbss->ies);
1923                 if (ies) {
1924                         int ret;
1925
1926                         ret = cfg80211_get_p2p_attr(
1927                                         ies->data, ies->len,
1928                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1929                                         (u8 *) &bss_conf->p2p_noa_attr,
1930                                         sizeof(bss_conf->p2p_noa_attr));
1931                         if (ret >= 2) {
1932                                 sdata->u.mgd.p2p_noa_index =
1933                                         bss_conf->p2p_noa_attr.index;
1934                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1935                         }
1936                 }
1937                 rcu_read_unlock();
1938         }
1939
1940         /* just to be sure */
1941         ieee80211_stop_poll(sdata);
1942
1943         ieee80211_led_assoc(local, 1);
1944
1945         if (sdata->u.mgd.have_beacon) {
1946                 /*
1947                  * If the AP is buggy we may get here with no DTIM period
1948                  * known, so assume it's 1 which is the only safe assumption
1949                  * in that case, although if the TIM IE is broken powersave
1950                  * probably just won't work at all.
1951                  */
1952                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1953                 bss_conf->beacon_rate = bss->beacon_rate;
1954                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1955         } else {
1956                 bss_conf->beacon_rate = NULL;
1957                 bss_conf->dtim_period = 0;
1958         }
1959
1960         bss_conf->assoc = 1;
1961
1962         /* Tell the driver to monitor connection quality (if supported) */
1963         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1964             bss_conf->cqm_rssi_thold)
1965                 bss_info_changed |= BSS_CHANGED_CQM;
1966
1967         /* Enable ARP filtering */
1968         if (bss_conf->arp_addr_cnt)
1969                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1970
1971         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1972
1973         mutex_lock(&local->iflist_mtx);
1974         ieee80211_recalc_ps(local);
1975         mutex_unlock(&local->iflist_mtx);
1976
1977         ieee80211_recalc_smps(sdata);
1978         ieee80211_recalc_ps_vif(sdata);
1979
1980         netif_carrier_on(sdata->dev);
1981 }
1982
1983 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1984                                    u16 stype, u16 reason, bool tx,
1985                                    u8 *frame_buf)
1986 {
1987         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1988         struct ieee80211_local *local = sdata->local;
1989         u32 changed = 0;
1990
1991         sdata_assert_lock(sdata);
1992
1993         if (WARN_ON_ONCE(tx && !frame_buf))
1994                 return;
1995
1996         if (WARN_ON(!ifmgd->associated))
1997                 return;
1998
1999         ieee80211_stop_poll(sdata);
2000
2001         ifmgd->associated = NULL;
2002         netif_carrier_off(sdata->dev);
2003
2004         /*
2005          * if we want to get out of ps before disassoc (why?) we have
2006          * to do it before sending disassoc, as otherwise the null-packet
2007          * won't be valid.
2008          */
2009         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2010                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2011                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2012         }
2013         local->ps_sdata = NULL;
2014
2015         /* disable per-vif ps */
2016         ieee80211_recalc_ps_vif(sdata);
2017
2018         /* make sure ongoing transmission finishes */
2019         synchronize_net();
2020
2021         /*
2022          * drop any frame before deauth/disassoc, this can be data or
2023          * management frame. Since we are disconnecting, we should not
2024          * insist sending these frames which can take time and delay
2025          * the disconnection and possible the roaming.
2026          */
2027         if (tx)
2028                 ieee80211_flush_queues(local, sdata, true);
2029
2030         /* deauthenticate/disassociate now */
2031         if (tx || frame_buf)
2032                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2033                                                reason, tx, frame_buf);
2034
2035         /* flush out frame - make sure the deauth was actually sent */
2036         if (tx)
2037                 ieee80211_flush_queues(local, sdata, false);
2038
2039         /* clear bssid only after building the needed mgmt frames */
2040         eth_zero_addr(ifmgd->bssid);
2041
2042         /* remove AP and TDLS peers */
2043         sta_info_flush(sdata);
2044
2045         /* finally reset all BSS / config parameters */
2046         changed |= ieee80211_reset_erp_info(sdata);
2047
2048         ieee80211_led_assoc(local, 0);
2049         changed |= BSS_CHANGED_ASSOC;
2050         sdata->vif.bss_conf.assoc = false;
2051
2052         ifmgd->p2p_noa_index = -1;
2053         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2054                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2055
2056         /* on the next assoc, re-program HT/VHT parameters */
2057         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2058         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2059         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2060         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2061         sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2062
2063         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2064
2065         del_timer_sync(&local->dynamic_ps_timer);
2066         cancel_work_sync(&local->dynamic_ps_enable_work);
2067
2068         /* Disable ARP filtering */
2069         if (sdata->vif.bss_conf.arp_addr_cnt)
2070                 changed |= BSS_CHANGED_ARP_FILTER;
2071
2072         sdata->vif.bss_conf.qos = false;
2073         changed |= BSS_CHANGED_QOS;
2074
2075         /* The BSSID (not really interesting) and HT changed */
2076         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2077         ieee80211_bss_info_change_notify(sdata, changed);
2078
2079         /* disassociated - set to defaults now */
2080         ieee80211_set_wmm_default(sdata, false);
2081
2082         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2083         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2084         del_timer_sync(&sdata->u.mgd.timer);
2085         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2086
2087         sdata->vif.bss_conf.dtim_period = 0;
2088         sdata->vif.bss_conf.beacon_rate = NULL;
2089
2090         ifmgd->have_beacon = false;
2091
2092         ifmgd->flags = 0;
2093         mutex_lock(&local->mtx);
2094         ieee80211_vif_release_channel(sdata);
2095
2096         sdata->vif.csa_active = false;
2097         ifmgd->csa_waiting_bcn = false;
2098         ifmgd->csa_ignored_same_chan = false;
2099         if (sdata->csa_block_tx) {
2100                 ieee80211_wake_vif_queues(local, sdata,
2101                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2102                 sdata->csa_block_tx = false;
2103         }
2104         mutex_unlock(&local->mtx);
2105
2106         /* existing TX TSPEC sessions no longer exist */
2107         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2108         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2109
2110         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2111 }
2112
2113 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2114                              struct ieee80211_hdr *hdr)
2115 {
2116         /*
2117          * We can postpone the mgd.timer whenever receiving unicast frames
2118          * from AP because we know that the connection is working both ways
2119          * at that time. But multicast frames (and hence also beacons) must
2120          * be ignored here, because we need to trigger the timer during
2121          * data idle periods for sending the periodic probe request to the
2122          * AP we're connected to.
2123          */
2124         if (is_multicast_ether_addr(hdr->addr1))
2125                 return;
2126
2127         ieee80211_sta_reset_conn_monitor(sdata);
2128 }
2129
2130 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2131 {
2132         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2133         struct ieee80211_local *local = sdata->local;
2134
2135         mutex_lock(&local->mtx);
2136         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2137                 goto out;
2138
2139         __ieee80211_stop_poll(sdata);
2140
2141         mutex_lock(&local->iflist_mtx);
2142         ieee80211_recalc_ps(local);
2143         mutex_unlock(&local->iflist_mtx);
2144
2145         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2146                 goto out;
2147
2148         /*
2149          * We've received a probe response, but are not sure whether
2150          * we have or will be receiving any beacons or data, so let's
2151          * schedule the timers again, just in case.
2152          */
2153         ieee80211_sta_reset_beacon_monitor(sdata);
2154
2155         mod_timer(&ifmgd->conn_mon_timer,
2156                   round_jiffies_up(jiffies +
2157                                    IEEE80211_CONNECTION_IDLE_TIME));
2158 out:
2159         mutex_unlock(&local->mtx);
2160 }
2161
2162 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2163                                            struct ieee80211_hdr *hdr,
2164                                            u16 tx_time)
2165 {
2166         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2167         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2168         int ac = ieee80211_ac_from_tid(tid);
2169         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2170         unsigned long now = jiffies;
2171
2172         if (likely(!tx_tspec->admitted_time))
2173                 return;
2174
2175         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2176                 tx_tspec->consumed_tx_time = 0;
2177                 tx_tspec->time_slice_start = now;
2178
2179                 if (tx_tspec->downgraded) {
2180                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2181                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2182                 }
2183         }
2184
2185         if (tx_tspec->downgraded)
2186                 return;
2187
2188         tx_tspec->consumed_tx_time += tx_time;
2189
2190         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2191                 tx_tspec->downgraded = true;
2192                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2193                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2194         }
2195 }
2196
2197 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2198                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2199 {
2200         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2201
2202         if (!ieee80211_is_data(hdr->frame_control))
2203             return;
2204
2205         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2206             sdata->u.mgd.probe_send_count > 0) {
2207                 if (ack)
2208                         ieee80211_sta_reset_conn_monitor(sdata);
2209                 else
2210                         sdata->u.mgd.nullfunc_failed = true;
2211                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2212                 return;
2213         }
2214
2215         if (ack)
2216                 ieee80211_sta_reset_conn_monitor(sdata);
2217 }
2218
2219 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2220 {
2221         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2222         const u8 *ssid;
2223         u8 *dst = ifmgd->associated->bssid;
2224         u8 unicast_limit = max(1, max_probe_tries - 3);
2225
2226         /*
2227          * Try sending broadcast probe requests for the last three
2228          * probe requests after the first ones failed since some
2229          * buggy APs only support broadcast probe requests.
2230          */
2231         if (ifmgd->probe_send_count >= unicast_limit)
2232                 dst = NULL;
2233
2234         /*
2235          * When the hardware reports an accurate Tx ACK status, it's
2236          * better to send a nullfunc frame instead of a probe request,
2237          * as it will kick us off the AP quickly if we aren't associated
2238          * anymore. The timeout will be reset if the frame is ACKed by
2239          * the AP.
2240          */
2241         ifmgd->probe_send_count++;
2242
2243         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2244                 ifmgd->nullfunc_failed = false;
2245                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2246         } else {
2247                 int ssid_len;
2248
2249                 rcu_read_lock();
2250                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2251                 if (WARN_ON_ONCE(ssid == NULL))
2252                         ssid_len = 0;
2253                 else
2254                         ssid_len = ssid[1];
2255
2256                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2257                                          ssid + 2, ssid_len, NULL,
2258                                          0, (u32) -1, true, 0,
2259                                          ifmgd->associated->channel, false);
2260                 rcu_read_unlock();
2261         }
2262
2263         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2264         run_again(sdata, ifmgd->probe_timeout);
2265 }
2266
2267 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2268                                    bool beacon)
2269 {
2270         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2271         bool already = false;
2272
2273         if (!ieee80211_sdata_running(sdata))
2274                 return;
2275
2276         sdata_lock(sdata);
2277
2278         if (!ifmgd->associated)
2279                 goto out;
2280
2281         mutex_lock(&sdata->local->mtx);
2282
2283         if (sdata->local->tmp_channel || sdata->local->scanning) {
2284                 mutex_unlock(&sdata->local->mtx);
2285                 goto out;
2286         }
2287
2288         if (beacon) {
2289                 mlme_dbg_ratelimited(sdata,
2290                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2291                                      beacon_loss_count);
2292
2293                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2294         }
2295
2296         /*
2297          * The driver/our work has already reported this event or the
2298          * connection monitoring has kicked in and we have already sent
2299          * a probe request. Or maybe the AP died and the driver keeps
2300          * reporting until we disassociate...
2301          *
2302          * In either case we have to ignore the current call to this
2303          * function (except for setting the correct probe reason bit)
2304          * because otherwise we would reset the timer every time and
2305          * never check whether we received a probe response!
2306          */
2307         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2308                 already = true;
2309
2310         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2311
2312         mutex_unlock(&sdata->local->mtx);
2313
2314         if (already)
2315                 goto out;
2316
2317         mutex_lock(&sdata->local->iflist_mtx);
2318         ieee80211_recalc_ps(sdata->local);
2319         mutex_unlock(&sdata->local->iflist_mtx);
2320
2321         ifmgd->probe_send_count = 0;
2322         ieee80211_mgd_probe_ap_send(sdata);
2323  out:
2324         sdata_unlock(sdata);
2325 }
2326
2327 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2328                                           struct ieee80211_vif *vif)
2329 {
2330         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2331         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2332         struct cfg80211_bss *cbss;
2333         struct sk_buff *skb;
2334         const u8 *ssid;
2335         int ssid_len;
2336
2337         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2338                 return NULL;
2339
2340         sdata_assert_lock(sdata);
2341
2342         if (ifmgd->associated)
2343                 cbss = ifmgd->associated;
2344         else if (ifmgd->auth_data)
2345                 cbss = ifmgd->auth_data->bss;
2346         else if (ifmgd->assoc_data)
2347                 cbss = ifmgd->assoc_data->bss;
2348         else
2349                 return NULL;
2350
2351         rcu_read_lock();
2352         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2353         if (WARN_ON_ONCE(ssid == NULL))
2354                 ssid_len = 0;
2355         else
2356                 ssid_len = ssid[1];
2357
2358         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2359                                         (u32) -1, cbss->channel,
2360                                         ssid + 2, ssid_len,
2361                                         NULL, 0, true);
2362         rcu_read_unlock();
2363
2364         return skb;
2365 }
2366 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2367
2368 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2369                                         const u8 *buf, size_t len, bool tx,
2370                                         u16 reason)
2371 {
2372         struct ieee80211_event event = {
2373                 .type = MLME_EVENT,
2374                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2375                 .u.mlme.reason = reason,
2376         };
2377
2378         if (tx)
2379                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2380         else
2381                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2382
2383         drv_event_callback(sdata->local, sdata, &event);
2384 }
2385
2386 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2387 {
2388         struct ieee80211_local *local = sdata->local;
2389         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2390         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2391
2392         sdata_lock(sdata);
2393         if (!ifmgd->associated) {
2394                 sdata_unlock(sdata);
2395                 return;
2396         }
2397
2398         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2399                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2400                                true, frame_buf);
2401         mutex_lock(&local->mtx);
2402         sdata->vif.csa_active = false;
2403         ifmgd->csa_waiting_bcn = false;
2404         if (sdata->csa_block_tx) {
2405                 ieee80211_wake_vif_queues(local, sdata,
2406                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2407                 sdata->csa_block_tx = false;
2408         }
2409         mutex_unlock(&local->mtx);
2410
2411         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2412                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2413
2414         sdata_unlock(sdata);
2415 }
2416
2417 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2418 {
2419         struct ieee80211_sub_if_data *sdata =
2420                 container_of(work, struct ieee80211_sub_if_data,
2421                              u.mgd.beacon_connection_loss_work);
2422         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2423         struct sta_info *sta;
2424
2425         if (ifmgd->associated) {
2426                 rcu_read_lock();
2427                 sta = sta_info_get(sdata, ifmgd->bssid);
2428                 if (sta)
2429                         sta->beacon_loss_count++;
2430                 rcu_read_unlock();
2431         }
2432
2433         if (ifmgd->connection_loss) {
2434                 sdata_info(sdata, "Connection to AP %pM lost\n",
2435                            ifmgd->bssid);
2436                 __ieee80211_disconnect(sdata);
2437         } else {
2438                 ieee80211_mgd_probe_ap(sdata, true);
2439         }
2440 }
2441
2442 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2443 {
2444         struct ieee80211_sub_if_data *sdata =
2445                 container_of(work, struct ieee80211_sub_if_data,
2446                              u.mgd.csa_connection_drop_work);
2447
2448         __ieee80211_disconnect(sdata);
2449 }
2450
2451 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2452 {
2453         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2454         struct ieee80211_hw *hw = &sdata->local->hw;
2455
2456         trace_api_beacon_loss(sdata);
2457
2458         sdata->u.mgd.connection_loss = false;
2459         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2460 }
2461 EXPORT_SYMBOL(ieee80211_beacon_loss);
2462
2463 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2464 {
2465         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2466         struct ieee80211_hw *hw = &sdata->local->hw;
2467
2468         trace_api_connection_loss(sdata);
2469
2470         sdata->u.mgd.connection_loss = true;
2471         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2472 }
2473 EXPORT_SYMBOL(ieee80211_connection_loss);
2474
2475
2476 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2477                                         bool assoc)
2478 {
2479         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2480
2481         sdata_assert_lock(sdata);
2482
2483         if (!assoc) {
2484                 /*
2485                  * we are not authenticated yet, the only timer that could be
2486                  * running is the timeout for the authentication response which
2487                  * which is not relevant anymore.
2488                  */
2489                 del_timer_sync(&sdata->u.mgd.timer);
2490                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2491
2492                 eth_zero_addr(sdata->u.mgd.bssid);
2493                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2494                 sdata->u.mgd.flags = 0;
2495                 mutex_lock(&sdata->local->mtx);
2496                 ieee80211_vif_release_channel(sdata);
2497                 mutex_unlock(&sdata->local->mtx);
2498         }
2499
2500         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2501         kfree(auth_data);
2502         sdata->u.mgd.auth_data = NULL;
2503 }
2504
2505 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2506                                          bool assoc)
2507 {
2508         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2509
2510         sdata_assert_lock(sdata);
2511
2512         if (!assoc) {
2513                 /*
2514                  * we are not associated yet, the only timer that could be
2515                  * running is the timeout for the association response which
2516                  * which is not relevant anymore.
2517                  */
2518                 del_timer_sync(&sdata->u.mgd.timer);
2519                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2520
2521                 eth_zero_addr(sdata->u.mgd.bssid);
2522                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2523                 sdata->u.mgd.flags = 0;
2524                 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2525                 mutex_lock(&sdata->local->mtx);
2526                 ieee80211_vif_release_channel(sdata);
2527                 mutex_unlock(&sdata->local->mtx);
2528         }
2529
2530         kfree(assoc_data);
2531         sdata->u.mgd.assoc_data = NULL;
2532 }
2533
2534 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2535                                      struct ieee80211_mgmt *mgmt, size_t len)
2536 {
2537         struct ieee80211_local *local = sdata->local;
2538         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2539         u8 *pos;
2540         struct ieee802_11_elems elems;
2541         u32 tx_flags = 0;
2542
2543         pos = mgmt->u.auth.variable;
2544         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2545         if (!elems.challenge)
2546                 return;
2547         auth_data->expected_transaction = 4;
2548         drv_mgd_prepare_tx(sdata->local, sdata);
2549         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2550                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2551                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2552         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2553                             elems.challenge - 2, elems.challenge_len + 2,
2554                             auth_data->bss->bssid, auth_data->bss->bssid,
2555                             auth_data->key, auth_data->key_len,
2556                             auth_data->key_idx, tx_flags);
2557 }
2558
2559 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2560                                    struct ieee80211_mgmt *mgmt, size_t len)
2561 {
2562         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2563         u8 bssid[ETH_ALEN];
2564         u16 auth_alg, auth_transaction, status_code;
2565         struct sta_info *sta;
2566         struct ieee80211_event event = {
2567                 .type = MLME_EVENT,
2568                 .u.mlme.data = AUTH_EVENT,
2569         };
2570
2571         sdata_assert_lock(sdata);
2572
2573         if (len < 24 + 6)
2574                 return;
2575
2576         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2577                 return;
2578
2579         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2580
2581         if (!ether_addr_equal(bssid, mgmt->bssid))
2582                 return;
2583
2584         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2585         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2586         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2587
2588         if (auth_alg != ifmgd->auth_data->algorithm ||
2589             auth_transaction != ifmgd->auth_data->expected_transaction) {
2590                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2591                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2592                            auth_transaction,
2593                            ifmgd->auth_data->expected_transaction);
2594                 return;
2595         }
2596
2597         if (status_code != WLAN_STATUS_SUCCESS) {
2598                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2599                            mgmt->sa, status_code);
2600                 ieee80211_destroy_auth_data(sdata, false);
2601                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2602                 event.u.mlme.status = MLME_DENIED;
2603                 event.u.mlme.reason = status_code;
2604                 drv_event_callback(sdata->local, sdata, &event);
2605                 return;
2606         }
2607
2608         switch (ifmgd->auth_data->algorithm) {
2609         case WLAN_AUTH_OPEN:
2610         case WLAN_AUTH_LEAP:
2611         case WLAN_AUTH_FT:
2612         case WLAN_AUTH_SAE:
2613                 break;
2614         case WLAN_AUTH_SHARED_KEY:
2615                 if (ifmgd->auth_data->expected_transaction != 4) {
2616                         ieee80211_auth_challenge(sdata, mgmt, len);
2617                         /* need another frame */
2618                         return;
2619                 }
2620                 break;
2621         default:
2622                 WARN_ONCE(1, "invalid auth alg %d",
2623                           ifmgd->auth_data->algorithm);
2624                 return;
2625         }
2626
2627         event.u.mlme.status = MLME_SUCCESS;
2628         drv_event_callback(sdata->local, sdata, &event);
2629         sdata_info(sdata, "authenticated\n");
2630         ifmgd->auth_data->done = true;
2631         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2632         ifmgd->auth_data->timeout_started = true;
2633         run_again(sdata, ifmgd->auth_data->timeout);
2634
2635         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2636             ifmgd->auth_data->expected_transaction != 2) {
2637                 /*
2638                  * Report auth frame to user space for processing since another
2639                  * round of Authentication frames is still needed.
2640                  */
2641                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2642                 return;
2643         }
2644
2645         /* move station state to auth */
2646         mutex_lock(&sdata->local->sta_mtx);
2647         sta = sta_info_get(sdata, bssid);
2648         if (!sta) {
2649                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2650                 goto out_err;
2651         }
2652         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2653                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2654                 goto out_err;
2655         }
2656         mutex_unlock(&sdata->local->sta_mtx);
2657
2658         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2659         return;
2660  out_err:
2661         mutex_unlock(&sdata->local->sta_mtx);
2662         /* ignore frame -- wait for timeout */
2663 }
2664
2665 #define case_WLAN(type) \
2666         case WLAN_REASON_##type: return #type
2667
2668 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2669 {
2670         switch (reason_code) {
2671         case_WLAN(UNSPECIFIED);
2672         case_WLAN(PREV_AUTH_NOT_VALID);
2673         case_WLAN(DEAUTH_LEAVING);
2674         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2675         case_WLAN(DISASSOC_AP_BUSY);
2676         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2677         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2678         case_WLAN(DISASSOC_STA_HAS_LEFT);
2679         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2680         case_WLAN(DISASSOC_BAD_POWER);
2681         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2682         case_WLAN(INVALID_IE);
2683         case_WLAN(MIC_FAILURE);
2684         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2685         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2686         case_WLAN(IE_DIFFERENT);
2687         case_WLAN(INVALID_GROUP_CIPHER);
2688         case_WLAN(INVALID_PAIRWISE_CIPHER);
2689         case_WLAN(INVALID_AKMP);
2690         case_WLAN(UNSUPP_RSN_VERSION);
2691         case_WLAN(INVALID_RSN_IE_CAP);
2692         case_WLAN(IEEE8021X_FAILED);
2693         case_WLAN(CIPHER_SUITE_REJECTED);
2694         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2695         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2696         case_WLAN(DISASSOC_LOW_ACK);
2697         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2698         case_WLAN(QSTA_LEAVE_QBSS);
2699         case_WLAN(QSTA_NOT_USE);
2700         case_WLAN(QSTA_REQUIRE_SETUP);
2701         case_WLAN(QSTA_TIMEOUT);
2702         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2703         case_WLAN(MESH_PEER_CANCELED);
2704         case_WLAN(MESH_MAX_PEERS);
2705         case_WLAN(MESH_CONFIG);
2706         case_WLAN(MESH_CLOSE);
2707         case_WLAN(MESH_MAX_RETRIES);
2708         case_WLAN(MESH_CONFIRM_TIMEOUT);
2709         case_WLAN(MESH_INVALID_GTK);
2710         case_WLAN(MESH_INCONSISTENT_PARAM);
2711         case_WLAN(MESH_INVALID_SECURITY);
2712         case_WLAN(MESH_PATH_ERROR);
2713         case_WLAN(MESH_PATH_NOFORWARD);
2714         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2715         case_WLAN(MAC_EXISTS_IN_MBSS);
2716         case_WLAN(MESH_CHAN_REGULATORY);
2717         case_WLAN(MESH_CHAN);
2718         default: return "<unknown>";
2719         }
2720 }
2721
2722 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2723                                      struct ieee80211_mgmt *mgmt, size_t len)
2724 {
2725         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2726         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2727
2728         sdata_assert_lock(sdata);
2729
2730         if (len < 24 + 2)
2731                 return;
2732
2733         if (ifmgd->associated &&
2734             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2735                 const u8 *bssid = ifmgd->associated->bssid;
2736
2737                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2738                            bssid, reason_code,
2739                            ieee80211_get_reason_code_string(reason_code));
2740
2741                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2742
2743                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2744                                             reason_code);
2745                 return;
2746         }
2747
2748         if (ifmgd->assoc_data &&
2749             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2750                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2751
2752                 sdata_info(sdata,
2753                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2754                            bssid, reason_code,
2755                            ieee80211_get_reason_code_string(reason_code));
2756
2757                 ieee80211_destroy_assoc_data(sdata, false);
2758
2759                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2760                 return;
2761         }
2762 }
2763
2764
2765 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2766                                        struct ieee80211_mgmt *mgmt, size_t len)
2767 {
2768         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2769         u16 reason_code;
2770
2771         sdata_assert_lock(sdata);
2772
2773         if (len < 24 + 2)
2774                 return;
2775
2776         if (!ifmgd->associated ||
2777             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2778                 return;
2779
2780         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2781
2782         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2783                    mgmt->sa, reason_code);
2784
2785         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2786
2787         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2788 }
2789
2790 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2791                                 u8 *supp_rates, unsigned int supp_rates_len,
2792                                 u32 *rates, u32 *basic_rates,
2793                                 bool *have_higher_than_11mbit,
2794                                 int *min_rate, int *min_rate_index,
2795                                 int shift, u32 rate_flags)
2796 {
2797         int i, j;
2798
2799         for (i = 0; i < supp_rates_len; i++) {
2800                 int rate = supp_rates[i] & 0x7f;
2801                 bool is_basic = !!(supp_rates[i] & 0x80);
2802
2803                 if ((rate * 5 * (1 << shift)) > 110)
2804                         *have_higher_than_11mbit = true;
2805
2806                 /*
2807                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2808                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2809                  *
2810                  * Note: Even through the membership selector and the basic
2811                  *       rate flag share the same bit, they are not exactly
2812                  *       the same.
2813                  */
2814                 if (!!(supp_rates[i] & 0x80) &&
2815                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2816                         continue;
2817
2818                 for (j = 0; j < sband->n_bitrates; j++) {
2819                         struct ieee80211_rate *br;
2820                         int brate;
2821
2822                         br = &sband->bitrates[j];
2823                         if ((rate_flags & br->flags) != rate_flags)
2824                                 continue;
2825
2826                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2827                         if (brate == rate) {
2828                                 *rates |= BIT(j);
2829                                 if (is_basic)
2830                                         *basic_rates |= BIT(j);
2831                                 if ((rate * 5) < *min_rate) {
2832                                         *min_rate = rate * 5;
2833                                         *min_rate_index = j;
2834                                 }
2835                                 break;
2836                         }
2837                 }
2838         }
2839 }
2840
2841 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2842                                     struct cfg80211_bss *cbss,
2843                                     struct ieee80211_mgmt *mgmt, size_t len)
2844 {
2845         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2846         struct ieee80211_local *local = sdata->local;
2847         struct ieee80211_supported_band *sband;
2848         struct sta_info *sta;
2849         u8 *pos;
2850         u16 capab_info, aid;
2851         struct ieee802_11_elems elems;
2852         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2853         const struct cfg80211_bss_ies *bss_ies = NULL;
2854         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2855         u32 changed = 0;
2856         int err;
2857         bool ret;
2858
2859         /* AssocResp and ReassocResp have identical structure */
2860
2861         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2862         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2863
2864         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2865                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2866                            aid);
2867         aid &= ~(BIT(15) | BIT(14));
2868
2869         ifmgd->broken_ap = false;
2870
2871         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2872                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2873                            aid);
2874                 aid = 0;
2875                 ifmgd->broken_ap = true;
2876         }
2877
2878         pos = mgmt->u.assoc_resp.variable;
2879         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2880
2881         if (!elems.supp_rates) {
2882                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2883                 return false;
2884         }
2885
2886         ifmgd->aid = aid;
2887         ifmgd->tdls_chan_switch_prohibited =
2888                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2889                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2890
2891         /*
2892          * Some APs are erroneously not including some information in their
2893          * (re)association response frames. Try to recover by using the data
2894          * from the beacon or probe response. This seems to afflict mobile
2895          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2896          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2897          */
2898         if ((assoc_data->wmm && !elems.wmm_param) ||
2899             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2900              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2901             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2902              (!elems.vht_cap_elem || !elems.vht_operation))) {
2903                 const struct cfg80211_bss_ies *ies;
2904                 struct ieee802_11_elems bss_elems;
2905
2906                 rcu_read_lock();
2907                 ies = rcu_dereference(cbss->ies);
2908                 if (ies)
2909                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2910                                           GFP_ATOMIC);
2911                 rcu_read_unlock();
2912                 if (!bss_ies)
2913                         return false;
2914
2915                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2916                                        false, &bss_elems);
2917                 if (assoc_data->wmm &&
2918                     !elems.wmm_param && bss_elems.wmm_param) {
2919                         elems.wmm_param = bss_elems.wmm_param;
2920                         sdata_info(sdata,
2921                                    "AP bug: WMM param missing from AssocResp\n");
2922                 }
2923
2924                 /*
2925                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2926                  * have to include the IEs in the (re)association response.
2927                  */
2928                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2929                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2930                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2931                         sdata_info(sdata,
2932                                    "AP bug: HT capability missing from AssocResp\n");
2933                 }
2934                 if (!elems.ht_operation && bss_elems.ht_operation &&
2935                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2936                         elems.ht_operation = bss_elems.ht_operation;
2937                         sdata_info(sdata,
2938                                    "AP bug: HT operation missing from AssocResp\n");
2939                 }
2940                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2941                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2942                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2943                         sdata_info(sdata,
2944                                    "AP bug: VHT capa missing from AssocResp\n");
2945                 }
2946                 if (!elems.vht_operation && bss_elems.vht_operation &&
2947                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2948                         elems.vht_operation = bss_elems.vht_operation;
2949                         sdata_info(sdata,
2950                                    "AP bug: VHT operation missing from AssocResp\n");
2951                 }
2952         }
2953
2954         /*
2955          * We previously checked these in the beacon/probe response, so
2956          * they should be present here. This is just a safety net.
2957          */
2958         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2959             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2960                 sdata_info(sdata,
2961                            "HT AP is missing WMM params or HT capability/operation\n");
2962                 ret = false;
2963                 goto out;
2964         }
2965
2966         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2967             (!elems.vht_cap_elem || !elems.vht_operation)) {
2968                 sdata_info(sdata,
2969                            "VHT AP is missing VHT capability/operation\n");
2970                 ret = false;
2971                 goto out;
2972         }
2973
2974         mutex_lock(&sdata->local->sta_mtx);
2975         /*
2976          * station info was already allocated and inserted before
2977          * the association and should be available to us
2978          */
2979         sta = sta_info_get(sdata, cbss->bssid);
2980         if (WARN_ON(!sta)) {
2981                 mutex_unlock(&sdata->local->sta_mtx);
2982                 ret = false;
2983                 goto out;
2984         }
2985
2986         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2987
2988         /* Set up internal HT/VHT capabilities */
2989         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2990                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2991                                                   elems.ht_cap_elem, sta);
2992
2993         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2994                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2995                                                     elems.vht_cap_elem, sta);
2996
2997         /*
2998          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2999          * in their association response, so ignore that data for our own
3000          * configuration. If it changed since the last beacon, we'll get the
3001          * next beacon and update then.
3002          */
3003
3004         /*
3005          * If an operating mode notification IE is present, override the
3006          * NSS calculation (that would be done in rate_control_rate_init())
3007          * and use the # of streams from that element.
3008          */
3009         if (elems.opmode_notif &&
3010             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3011                 u8 nss;
3012
3013                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3014                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3015                 nss += 1;
3016                 sta->sta.rx_nss = nss;
3017         }
3018
3019         rate_control_rate_init(sta);
3020
3021         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3022                 set_sta_flag(sta, WLAN_STA_MFP);
3023                 sta->sta.mfp = true;
3024         } else {
3025                 sta->sta.mfp = false;
3026         }
3027
3028         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3029
3030         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3031         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3032                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3033         if (err) {
3034                 sdata_info(sdata,
3035                            "failed to move station %pM to desired state\n",
3036                            sta->sta.addr);
3037                 WARN_ON(__sta_info_destroy(sta));
3038                 mutex_unlock(&sdata->local->sta_mtx);
3039                 ret = false;
3040                 goto out;
3041         }
3042
3043         mutex_unlock(&sdata->local->sta_mtx);
3044
3045         /*
3046          * Always handle WMM once after association regardless
3047          * of the first value the AP uses. Setting -1 here has
3048          * that effect because the AP values is an unsigned
3049          * 4-bit value.
3050          */
3051         ifmgd->wmm_last_param_set = -1;
3052
3053         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3054                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3055                                          elems.wmm_param_len);
3056         else
3057                 ieee80211_set_wmm_default(sdata, false);
3058         changed |= BSS_CHANGED_QOS;
3059
3060         /* set AID and assoc capability,
3061          * ieee80211_set_associated() will tell the driver */
3062         bss_conf->aid = aid;
3063         bss_conf->assoc_capability = capab_info;
3064         ieee80211_set_associated(sdata, cbss, changed);
3065
3066         /*
3067          * If we're using 4-addr mode, let the AP know that we're
3068          * doing so, so that it can create the STA VLAN on its side
3069          */
3070         if (ifmgd->use_4addr)
3071                 ieee80211_send_4addr_nullfunc(local, sdata);
3072
3073         /*
3074          * Start timer to probe the connection to the AP now.
3075          * Also start the timer that will detect beacon loss.
3076          */
3077         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3078         ieee80211_sta_reset_beacon_monitor(sdata);
3079
3080         ret = true;
3081  out:
3082         kfree(bss_ies);
3083         return ret;
3084 }
3085
3086 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3087                                          struct ieee80211_mgmt *mgmt,
3088                                          size_t len)
3089 {
3090         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3091         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3092         u16 capab_info, status_code, aid;
3093         struct ieee802_11_elems elems;
3094         int ac, uapsd_queues = -1;
3095         u8 *pos;
3096         bool reassoc;
3097         struct cfg80211_bss *bss;
3098         struct ieee80211_event event = {
3099                 .type = MLME_EVENT,
3100                 .u.mlme.data = ASSOC_EVENT,
3101         };
3102
3103         sdata_assert_lock(sdata);
3104
3105         if (!assoc_data)
3106                 return;
3107         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3108                 return;
3109
3110         /*
3111          * AssocResp and ReassocResp have identical structure, so process both
3112          * of them in this function.
3113          */
3114
3115         if (len < 24 + 6)
3116                 return;
3117
3118         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3119         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3120         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3121         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3122
3123         sdata_info(sdata,
3124                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3125                    reassoc ? "Rea" : "A", mgmt->sa,
3126                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3127
3128         pos = mgmt->u.assoc_resp.variable;
3129         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3130
3131         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3132             elems.timeout_int &&
3133             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3134                 u32 tu, ms;
3135                 tu = le32_to_cpu(elems.timeout_int->value);
3136                 ms = tu * 1024 / 1000;
3137                 sdata_info(sdata,
3138                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3139                            mgmt->sa, tu, ms);
3140                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3141                 assoc_data->timeout_started = true;
3142                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3143                         run_again(sdata, assoc_data->timeout);
3144                 return;
3145         }
3146
3147         bss = assoc_data->bss;
3148
3149         if (status_code != WLAN_STATUS_SUCCESS) {
3150                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3151                            mgmt->sa, status_code);
3152                 ieee80211_destroy_assoc_data(sdata, false);
3153                 event.u.mlme.status = MLME_DENIED;
3154                 event.u.mlme.reason = status_code;
3155                 drv_event_callback(sdata->local, sdata, &event);
3156         } else {
3157                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3158                         /* oops -- internal error -- send timeout for now */
3159                         ieee80211_destroy_assoc_data(sdata, false);
3160                         cfg80211_assoc_timeout(sdata->dev, bss);
3161                         return;
3162                 }
3163                 event.u.mlme.status = MLME_SUCCESS;
3164                 drv_event_callback(sdata->local, sdata, &event);
3165                 sdata_info(sdata, "associated\n");
3166
3167                 /*
3168                  * destroy assoc_data afterwards, as otherwise an idle
3169                  * recalc after assoc_data is NULL but before associated
3170                  * is set can cause the interface to go idle
3171                  */
3172                 ieee80211_destroy_assoc_data(sdata, true);
3173
3174                 /* get uapsd queues configuration */
3175                 uapsd_queues = 0;
3176                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3177                         if (sdata->tx_conf[ac].uapsd)
3178                                 uapsd_queues |= BIT(ac);
3179         }
3180
3181         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3182 }
3183
3184 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3185                                   struct ieee80211_mgmt *mgmt, size_t len,
3186                                   struct ieee80211_rx_status *rx_status,
3187                                   struct ieee802_11_elems *elems)
3188 {
3189         struct ieee80211_local *local = sdata->local;
3190         struct ieee80211_bss *bss;
3191         struct ieee80211_channel *channel;
3192
3193         sdata_assert_lock(sdata);
3194
3195         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3196         if (!channel)
3197                 return;
3198
3199         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3200                                         channel);
3201         if (bss) {
3202                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3203                 ieee80211_rx_bss_put(local, bss);
3204         }
3205 }
3206
3207
3208 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3209                                          struct sk_buff *skb)
3210 {
3211         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3212         struct ieee80211_if_managed *ifmgd;
3213         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3214         size_t baselen, len = skb->len;
3215         struct ieee802_11_elems elems;
3216
3217         ifmgd = &sdata->u.mgd;
3218
3219         sdata_assert_lock(sdata);
3220
3221         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3222                 return; /* ignore ProbeResp to foreign address */
3223
3224         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3225         if (baselen > len)
3226                 return;
3227
3228         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3229                                false, &elems);
3230
3231         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3232
3233         if (ifmgd->associated &&
3234             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3235                 ieee80211_reset_ap_probe(sdata);
3236 }
3237
3238 /*
3239  * This is the canonical list of information elements we care about,
3240  * the filter code also gives us all changes to the Microsoft OUI
3241  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3242  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3243  * changes to requested client power.
3244  *
3245  * We implement beacon filtering in software since that means we can
3246  * avoid processing the frame here and in cfg80211, and userspace
3247  * will not be able to tell whether the hardware supports it or not.
3248  *
3249  * XXX: This list needs to be dynamic -- userspace needs to be able to
3250  *      add items it requires. It also needs to be able to tell us to
3251  *      look out for other vendor IEs.
3252  */
3253 static const u64 care_about_ies =
3254         (1ULL << WLAN_EID_COUNTRY) |
3255         (1ULL << WLAN_EID_ERP_INFO) |
3256         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3257         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3258         (1ULL << WLAN_EID_HT_CAPABILITY) |
3259         (1ULL << WLAN_EID_HT_OPERATION) |
3260         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3261
3262 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3263                                      struct ieee80211_mgmt *mgmt, size_t len,
3264                                      struct ieee80211_rx_status *rx_status)
3265 {
3266         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3267         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3268         size_t baselen;
3269         struct ieee802_11_elems elems;
3270         struct ieee80211_local *local = sdata->local;
3271         struct ieee80211_chanctx_conf *chanctx_conf;
3272         struct ieee80211_channel *chan;
3273         struct sta_info *sta;
3274         u32 changed = 0;
3275         bool erp_valid;
3276         u8 erp_value = 0;
3277         u32 ncrc;
3278         u8 *bssid;
3279         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3280
3281         sdata_assert_lock(sdata);
3282
3283         /* Process beacon from the current BSS */
3284         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3285         if (baselen > len)
3286                 return;
3287
3288         rcu_read_lock();
3289         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3290         if (!chanctx_conf) {
3291                 rcu_read_unlock();
3292                 return;
3293         }
3294
3295         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3296                 rcu_read_unlock();
3297                 return;
3298         }
3299         chan = chanctx_conf->def.chan;
3300         rcu_read_unlock();
3301
3302         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3303             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3304                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3305                                        len - baselen, false, &elems);
3306
3307                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3308                 if (elems.tim && !elems.parse_error) {
3309                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3310                         ifmgd->dtim_period = tim_ie->dtim_period;
3311                 }
3312                 ifmgd->have_beacon = true;
3313                 ifmgd->assoc_data->need_beacon = false;
3314                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3315                         sdata->vif.bss_conf.sync_tsf =
3316                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3317                         sdata->vif.bss_conf.sync_device_ts =
3318                                 rx_status->device_timestamp;
3319                         if (elems.tim)
3320                                 sdata->vif.bss_conf.sync_dtim_count =
3321                                         elems.tim->dtim_count;
3322                         else
3323                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3324                 }
3325                 /* continue assoc process */
3326                 ifmgd->assoc_data->timeout = jiffies;
3327                 ifmgd->assoc_data->timeout_started = true;
3328                 run_again(sdata, ifmgd->assoc_data->timeout);
3329                 return;
3330         }
3331
3332         if (!ifmgd->associated ||
3333             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3334                 return;
3335         bssid = ifmgd->associated->bssid;
3336
3337         /* Track average RSSI from the Beacon frames of the current AP */
3338         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3339                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3340                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3341                 ifmgd->last_cqm_event_signal = 0;
3342                 ifmgd->count_beacon_signal = 1;
3343                 ifmgd->last_ave_beacon_signal = 0;
3344         } else {
3345                 ifmgd->count_beacon_signal++;
3346         }
3347
3348         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3349
3350         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3351             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3352                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3353                 int last_sig = ifmgd->last_ave_beacon_signal;
3354                 struct ieee80211_event event = {
3355                         .type = RSSI_EVENT,
3356                 };
3357
3358                 /*
3359                  * if signal crosses either of the boundaries, invoke callback
3360                  * with appropriate parameters
3361                  */
3362                 if (sig > ifmgd->rssi_max_thold &&
3363                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3364                         ifmgd->last_ave_beacon_signal = sig;
3365                         event.u.rssi.data = RSSI_EVENT_HIGH;
3366                         drv_event_callback(local, sdata, &event);
3367                 } else if (sig < ifmgd->rssi_min_thold &&
3368                            (last_sig >= ifmgd->rssi_max_thold ||
3369                            last_sig == 0)) {
3370                         ifmgd->last_ave_beacon_signal = sig;
3371                         event.u.rssi.data = RSSI_EVENT_LOW;
3372                         drv_event_callback(local, sdata, &event);
3373                 }
3374         }
3375
3376         if (bss_conf->cqm_rssi_thold &&
3377             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3378             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3379                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3380                 int last_event = ifmgd->last_cqm_event_signal;
3381                 int thold = bss_conf->cqm_rssi_thold;
3382                 int hyst = bss_conf->cqm_rssi_hyst;
3383
3384                 if (sig < thold &&
3385                     (last_event == 0 || sig < last_event - hyst)) {
3386                         ifmgd->last_cqm_event_signal = sig;
3387                         ieee80211_cqm_rssi_notify(
3388                                 &sdata->vif,
3389                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3390                                 GFP_KERNEL);
3391                 } else if (sig > thold &&
3392                            (last_event == 0 || sig > last_event + hyst)) {
3393                         ifmgd->last_cqm_event_signal = sig;
3394                         ieee80211_cqm_rssi_notify(
3395                                 &sdata->vif,
3396                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3397                                 GFP_KERNEL);
3398                 }
3399         }
3400
3401         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3402                 mlme_dbg_ratelimited(sdata,
3403                                      "cancelling AP probe due to a received beacon\n");
3404                 ieee80211_reset_ap_probe(sdata);
3405         }
3406
3407         /*
3408          * Push the beacon loss detection into the future since
3409          * we are processing a beacon from the AP just now.
3410          */
3411         ieee80211_sta_reset_beacon_monitor(sdata);
3412
3413         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3414         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3415                                           len - baselen, false, &elems,
3416                                           care_about_ies, ncrc);
3417
3418         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3419             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3420                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3421                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3422                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3423                                 ieee80211_hw_config(local,
3424                                                     IEEE80211_CONF_CHANGE_PS);
3425                         }
3426                         ieee80211_send_nullfunc(local, sdata, false);
3427                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3428                         local->pspolling = true;
3429
3430                         /*
3431                          * Here is assumed that the driver will be
3432                          * able to send ps-poll frame and receive a
3433                          * response even though power save mode is
3434                          * enabled, but some drivers might require
3435                          * to disable power save here. This needs
3436                          * to be investigated.
3437                          */
3438                         ieee80211_send_pspoll(local, sdata);
3439                 }
3440         }
3441
3442         if (sdata->vif.p2p) {
3443                 struct ieee80211_p2p_noa_attr noa = {};
3444                 int ret;
3445
3446                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3447                                             len - baselen,
3448                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3449                                             (u8 *) &noa, sizeof(noa));
3450                 if (ret >= 2) {
3451                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3452                                 /* valid noa_attr and index changed */
3453                                 sdata->u.mgd.p2p_noa_index = noa.index;
3454                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3455                                 changed |= BSS_CHANGED_P2P_PS;
3456                                 /*
3457                                  * make sure we update all information, the CRC
3458                                  * mechanism doesn't look at P2P attributes.
3459                                  */
3460                                 ifmgd->beacon_crc_valid = false;
3461                         }
3462                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3463                         /* noa_attr not found and we had valid noa_attr before */
3464                         sdata->u.mgd.p2p_noa_index = -1;
3465                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3466                         changed |= BSS_CHANGED_P2P_PS;
3467                         ifmgd->beacon_crc_valid = false;
3468                 }
3469         }
3470
3471         if (ifmgd->csa_waiting_bcn)
3472                 ieee80211_chswitch_post_beacon(sdata);
3473
3474         /*
3475          * Update beacon timing and dtim count on every beacon appearance. This
3476          * will allow the driver to use the most updated values. Do it before
3477          * comparing this one with last received beacon.
3478          * IMPORTANT: These parameters would possibly be out of sync by the time
3479          * the driver will use them. The synchronized view is currently
3480          * guaranteed only in certain callbacks.
3481          */
3482         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3483                 sdata->vif.bss_conf.sync_tsf =
3484                         le64_to_cpu(mgmt->u.beacon.timestamp);
3485                 sdata->vif.bss_conf.sync_device_ts =
3486                         rx_status->device_timestamp;
3487                 if (elems.tim)
3488                         sdata->vif.bss_conf.sync_dtim_count =
3489                                 elems.tim->dtim_count;
3490                 else
3491                         sdata->vif.bss_conf.sync_dtim_count = 0;
3492         }
3493
3494         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3495                 return;
3496         ifmgd->beacon_crc = ncrc;
3497         ifmgd->beacon_crc_valid = true;
3498
3499         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3500
3501         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3502                                          rx_status->device_timestamp,
3503                                          &elems, true);
3504
3505         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3506             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3507                                      elems.wmm_param_len))
3508                 changed |= BSS_CHANGED_QOS;
3509
3510         /*
3511          * If we haven't had a beacon before, tell the driver about the
3512          * DTIM period (and beacon timing if desired) now.
3513          */
3514         if (!ifmgd->have_beacon) {
3515                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3516                 if (elems.tim)
3517                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3518                 else
3519                         bss_conf->dtim_period = 1;
3520
3521                 changed |= BSS_CHANGED_BEACON_INFO;
3522                 ifmgd->have_beacon = true;
3523
3524                 mutex_lock(&local->iflist_mtx);
3525                 ieee80211_recalc_ps(local);
3526                 mutex_unlock(&local->iflist_mtx);
3527
3528                 ieee80211_recalc_ps_vif(sdata);
3529         }
3530
3531         if (elems.erp_info) {
3532                 erp_valid = true;
3533                 erp_value = elems.erp_info[0];
3534         } else {
3535                 erp_valid = false;
3536         }
3537         changed |= ieee80211_handle_bss_capability(sdata,
3538                         le16_to_cpu(mgmt->u.beacon.capab_info),
3539                         erp_valid, erp_value);
3540
3541         mutex_lock(&local->sta_mtx);
3542         sta = sta_info_get(sdata, bssid);
3543
3544         if (ieee80211_config_bw(sdata, sta,
3545                                 elems.ht_cap_elem, elems.ht_operation,
3546                                 elems.vht_operation, bssid, &changed)) {
3547                 mutex_unlock(&local->sta_mtx);
3548                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3549                                        WLAN_REASON_DEAUTH_LEAVING,
3550                                        true, deauth_buf);
3551                 ieee80211_report_disconnect(sdata, deauth_buf,
3552                                             sizeof(deauth_buf), true,
3553                                             WLAN_REASON_DEAUTH_LEAVING);
3554                 return;
3555         }
3556
3557         if (sta && elems.opmode_notif)
3558                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3559                                             rx_status->band, true);
3560         mutex_unlock(&local->sta_mtx);
3561
3562         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3563                                                elems.country_elem,
3564                                                elems.country_elem_len,
3565                                                elems.pwr_constr_elem,
3566                                                elems.cisco_dtpc_elem);
3567
3568         ieee80211_bss_info_change_notify(sdata, changed);
3569 }
3570
3571 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3572                                   struct sk_buff *skb)
3573 {
3574         struct ieee80211_rx_status *rx_status;
3575         struct ieee80211_mgmt *mgmt;
3576         u16 fc;
3577         struct ieee802_11_elems elems;
3578         int ies_len;
3579
3580         rx_status = (struct ieee80211_rx_status *) skb->cb;
3581         mgmt = (struct ieee80211_mgmt *) skb->data;
3582         fc = le16_to_cpu(mgmt->frame_control);
3583
3584         sdata_lock(sdata);
3585
3586         switch (fc & IEEE80211_FCTL_STYPE) {
3587         case IEEE80211_STYPE_BEACON:
3588                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3589                 break;
3590         case IEEE80211_STYPE_PROBE_RESP:
3591                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3592                 break;
3593         case IEEE80211_STYPE_AUTH:
3594                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3595                 break;
3596         case IEEE80211_STYPE_DEAUTH:
3597                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3598                 break;
3599         case IEEE80211_STYPE_DISASSOC:
3600                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3601                 break;
3602         case IEEE80211_STYPE_ASSOC_RESP:
3603         case IEEE80211_STYPE_REASSOC_RESP:
3604                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3605                 break;
3606         case IEEE80211_STYPE_ACTION:
3607                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3608                         ies_len = skb->len -
3609                                   offsetof(struct ieee80211_mgmt,
3610                                            u.action.u.chan_switch.variable);
3611
3612                         if (ies_len < 0)
3613                                 break;
3614
3615                         ieee802_11_parse_elems(
3616                                 mgmt->u.action.u.chan_switch.variable,
3617                                 ies_len, true, &elems);
3618
3619                         if (elems.parse_error)
3620                                 break;
3621
3622                         ieee80211_sta_process_chanswitch(sdata,
3623                                                  rx_status->mactime,
3624                                                  rx_status->device_timestamp,
3625                                                  &elems, false);
3626                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3627                         ies_len = skb->len -
3628                                   offsetof(struct ieee80211_mgmt,
3629                                            u.action.u.ext_chan_switch.variable);
3630
3631                         if (ies_len < 0)
3632                                 break;
3633
3634                         ieee802_11_parse_elems(
3635                                 mgmt->u.action.u.ext_chan_switch.variable,
3636                                 ies_len, true, &elems);
3637
3638                         if (elems.parse_error)
3639                                 break;
3640
3641                         /* for the handling code pretend this was also an IE */
3642                         elems.ext_chansw_ie =
3643                                 &mgmt->u.action.u.ext_chan_switch.data;
3644
3645                         ieee80211_sta_process_chanswitch(sdata,
3646                                                  rx_status->mactime,
3647                                                  rx_status->device_timestamp,
3648                                                  &elems, false);
3649                 }
3650                 break;
3651         }
3652         sdata_unlock(sdata);
3653 }
3654
3655 static void ieee80211_sta_timer(unsigned long data)
3656 {
3657         struct ieee80211_sub_if_data *sdata =
3658                 (struct ieee80211_sub_if_data *) data;
3659
3660         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3661 }
3662
3663 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3664                                           u8 *bssid, u8 reason, bool tx)
3665 {
3666         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3667
3668         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3669                                tx, frame_buf);
3670
3671         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3672                                     reason);
3673 }
3674
3675 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3676 {
3677         struct ieee80211_local *local = sdata->local;
3678         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3679         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3680         u32 tx_flags = 0;
3681         u16 trans = 1;
3682         u16 status = 0;
3683
3684         sdata_assert_lock(sdata);
3685
3686         if (WARN_ON_ONCE(!auth_data))
3687                 return -EINVAL;
3688
3689         auth_data->tries++;
3690
3691         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3692                 sdata_info(sdata, "authentication with %pM timed out\n",
3693                            auth_data->bss->bssid);
3694
3695                 /*
3696                  * Most likely AP is not in the range so remove the
3697                  * bss struct for that AP.
3698                  */
3699                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3700
3701                 return -ETIMEDOUT;
3702         }
3703
3704         drv_mgd_prepare_tx(local, sdata);
3705
3706         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3707                    auth_data->bss->bssid, auth_data->tries,
3708                    IEEE80211_AUTH_MAX_TRIES);
3709
3710         auth_data->expected_transaction = 2;
3711
3712         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3713                 trans = auth_data->sae_trans;
3714                 status = auth_data->sae_status;
3715                 auth_data->expected_transaction = trans;
3716         }
3717
3718         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3719                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3720                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3721
3722         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3723                             auth_data->data, auth_data->data_len,
3724                             auth_data->bss->bssid,
3725                             auth_data->bss->bssid, NULL, 0, 0,
3726                             tx_flags);
3727
3728         if (tx_flags == 0) {
3729                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3730                 auth_data->timeout_started = true;
3731                 run_again(sdata, auth_data->timeout);
3732         } else {
3733                 auth_data->timeout =
3734                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3735                 auth_data->timeout_started = true;
3736                 run_again(sdata, auth_data->timeout);
3737         }
3738
3739         return 0;
3740 }
3741
3742 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3743 {
3744         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3745         struct ieee80211_local *local = sdata->local;
3746
3747         sdata_assert_lock(sdata);
3748
3749         assoc_data->tries++;
3750         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3751                 sdata_info(sdata, "association with %pM timed out\n",
3752                            assoc_data->bss->bssid);
3753
3754                 /*
3755                  * Most likely AP is not in the range so remove the
3756                  * bss struct for that AP.
3757                  */
3758                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3759
3760                 return -ETIMEDOUT;
3761         }
3762
3763         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3764                    assoc_data->bss->bssid, assoc_data->tries,
3765                    IEEE80211_ASSOC_MAX_TRIES);
3766         ieee80211_send_assoc(sdata);
3767
3768         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3769                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3770                 assoc_data->timeout_started = true;
3771                 run_again(sdata, assoc_data->timeout);
3772         } else {
3773                 assoc_data->timeout =
3774                         round_jiffies_up(jiffies +
3775                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3776                 assoc_data->timeout_started = true;
3777                 run_again(sdata, assoc_data->timeout);
3778         }
3779
3780         return 0;
3781 }
3782
3783 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3784                                   __le16 fc, bool acked)
3785 {
3786         struct ieee80211_local *local = sdata->local;
3787
3788         sdata->u.mgd.status_fc = fc;
3789         sdata->u.mgd.status_acked = acked;
3790         sdata->u.mgd.status_received = true;
3791
3792         ieee80211_queue_work(&local->hw, &sdata->work);
3793 }
3794
3795 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3796 {
3797         struct ieee80211_local *local = sdata->local;
3798         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3799
3800         sdata_lock(sdata);
3801
3802         if (ifmgd->status_received) {
3803                 __le16 fc = ifmgd->status_fc;
3804                 bool status_acked = ifmgd->status_acked;
3805
3806                 ifmgd->status_received = false;
3807                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3808                         if (status_acked) {
3809                                 ifmgd->auth_data->timeout =
3810                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3811                                 run_again(sdata, ifmgd->auth_data->timeout);
3812                         } else {
3813                                 ifmgd->auth_data->timeout = jiffies - 1;
3814                         }
3815                         ifmgd->auth_data->timeout_started = true;
3816                 } else if (ifmgd->assoc_data &&
3817                            (ieee80211_is_assoc_req(fc) ||
3818                             ieee80211_is_reassoc_req(fc))) {
3819                         if (status_acked) {
3820                                 ifmgd->assoc_data->timeout =
3821                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3822                                 run_again(sdata, ifmgd->assoc_data->timeout);
3823                         } else {
3824                                 ifmgd->assoc_data->timeout = jiffies - 1;
3825                         }
3826                         ifmgd->assoc_data->timeout_started = true;
3827                 }
3828         }
3829
3830         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3831             time_after(jiffies, ifmgd->auth_data->timeout)) {
3832                 if (ifmgd->auth_data->done) {
3833                         /*
3834                          * ok ... we waited for assoc but userspace didn't,
3835                          * so let's just kill the auth data
3836                          */
3837                         ieee80211_destroy_auth_data(sdata, false);
3838                 } else if (ieee80211_auth(sdata)) {
3839                         u8 bssid[ETH_ALEN];
3840                         struct ieee80211_event event = {
3841                                 .type = MLME_EVENT,
3842                                 .u.mlme.data = AUTH_EVENT,
3843                                 .u.mlme.status = MLME_TIMEOUT,
3844                         };
3845
3846                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3847
3848                         ieee80211_destroy_auth_data(sdata, false);
3849
3850                         cfg80211_auth_timeout(sdata->dev, bssid);
3851                         drv_event_callback(sdata->local, sdata, &event);
3852                 }
3853         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3854                 run_again(sdata, ifmgd->auth_data->timeout);
3855
3856         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3857             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3858                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3859                     ieee80211_do_assoc(sdata)) {
3860                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3861                         struct ieee80211_event event = {
3862                                 .type = MLME_EVENT,
3863                                 .u.mlme.data = ASSOC_EVENT,
3864                                 .u.mlme.status = MLME_TIMEOUT,
3865                         };
3866
3867                         ieee80211_destroy_assoc_data(sdata, false);
3868                         cfg80211_assoc_timeout(sdata->dev, bss);
3869                         drv_event_callback(sdata->local, sdata, &event);
3870                 }
3871         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3872                 run_again(sdata, ifmgd->assoc_data->timeout);
3873
3874         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3875             ifmgd->associated) {
3876                 u8 bssid[ETH_ALEN];
3877                 int max_tries;
3878
3879                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3880
3881                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3882                         max_tries = max_nullfunc_tries;
3883                 else
3884                         max_tries = max_probe_tries;
3885
3886                 /* ACK received for nullfunc probing frame */
3887                 if (!ifmgd->probe_send_count)
3888                         ieee80211_reset_ap_probe(sdata);
3889                 else if (ifmgd->nullfunc_failed) {
3890                         if (ifmgd->probe_send_count < max_tries) {
3891                                 mlme_dbg(sdata,
3892                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3893                                          bssid, ifmgd->probe_send_count,
3894                                          max_tries);
3895                                 ieee80211_mgd_probe_ap_send(sdata);
3896                         } else {
3897                                 mlme_dbg(sdata,
3898                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3899                                          bssid);
3900                                 ieee80211_sta_connection_lost(sdata, bssid,
3901                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3902                                         false);
3903                         }
3904                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3905                         run_again(sdata, ifmgd->probe_timeout);
3906                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3907                         mlme_dbg(sdata,
3908                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3909                                  bssid, probe_wait_ms);
3910                         ieee80211_sta_connection_lost(sdata, bssid,
3911                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3912                 } else if (ifmgd->probe_send_count < max_tries) {
3913                         mlme_dbg(sdata,
3914                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3915                                  bssid, probe_wait_ms,
3916                                  ifmgd->probe_send_count, max_tries);
3917                         ieee80211_mgd_probe_ap_send(sdata);
3918                 } else {
3919                         /*
3920                          * We actually lost the connection ... or did we?
3921                          * Let's make sure!
3922                          */
3923                         wiphy_debug(local->hw.wiphy,
3924                                     "%s: No probe response from AP %pM"
3925                                     " after %dms, disconnecting.\n",
3926                                     sdata->name,
3927                                     bssid, probe_wait_ms);
3928
3929                         ieee80211_sta_connection_lost(sdata, bssid,
3930                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3931                 }
3932         }
3933
3934         sdata_unlock(sdata);
3935 }
3936
3937 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3938 {
3939         struct ieee80211_sub_if_data *sdata =
3940                 (struct ieee80211_sub_if_data *) data;
3941         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3942
3943         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3944                 return;
3945
3946         sdata->u.mgd.connection_loss = false;
3947         ieee80211_queue_work(&sdata->local->hw,
3948                              &sdata->u.mgd.beacon_connection_loss_work);
3949 }
3950
3951 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3952 {
3953         struct ieee80211_sub_if_data *sdata =
3954                 (struct ieee80211_sub_if_data *) data;
3955         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3956         struct ieee80211_local *local = sdata->local;
3957
3958         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3959                 return;
3960
3961         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3962 }
3963
3964 static void ieee80211_sta_monitor_work(struct work_struct *work)
3965 {
3966         struct ieee80211_sub_if_data *sdata =
3967                 container_of(work, struct ieee80211_sub_if_data,
3968                              u.mgd.monitor_work);
3969
3970         ieee80211_mgd_probe_ap(sdata, false);
3971 }
3972
3973 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3974 {
3975         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3976                 __ieee80211_stop_poll(sdata);
3977
3978                 /* let's probe the connection once */
3979                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
3980                         ieee80211_queue_work(&sdata->local->hw,
3981                                              &sdata->u.mgd.monitor_work);
3982                 /* and do all the other regular work too */
3983                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3984         }
3985 }
3986
3987 #ifdef CONFIG_PM
3988 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3989 {
3990         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3991         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3992
3993         sdata_lock(sdata);
3994
3995         if (ifmgd->auth_data || ifmgd->assoc_data) {
3996                 const u8 *bssid = ifmgd->auth_data ?
3997                                 ifmgd->auth_data->bss->bssid :
3998                                 ifmgd->assoc_data->bss->bssid;
3999
4000                 /*
4001                  * If we are trying to authenticate / associate while suspending,
4002                  * cfg80211 won't know and won't actually abort those attempts,
4003                  * thus we need to do that ourselves.
4004                  */
4005                 ieee80211_send_deauth_disassoc(sdata, bssid,
4006                                                IEEE80211_STYPE_DEAUTH,
4007                                                WLAN_REASON_DEAUTH_LEAVING,
4008                                                false, frame_buf);
4009                 if (ifmgd->assoc_data)
4010                         ieee80211_destroy_assoc_data(sdata, false);
4011                 if (ifmgd->auth_data)
4012                         ieee80211_destroy_auth_data(sdata, false);
4013                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4014                                       IEEE80211_DEAUTH_FRAME_LEN);
4015         }
4016
4017         /* This is a bit of a hack - we should find a better and more generic
4018          * solution to this. Normally when suspending, cfg80211 will in fact
4019          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4020          * auth (not so important) or assoc (this is the problem) process.
4021          *
4022          * As a consequence, it can happen that we are in the process of both
4023          * associating and suspending, and receive an association response
4024          * after cfg80211 has checked if it needs to disconnect, but before
4025          * we actually set the flag to drop incoming frames. This will then
4026          * cause the workqueue flush to process the association response in
4027          * the suspend, resulting in a successful association just before it
4028          * tries to remove the interface from the driver, which now though
4029          * has a channel context assigned ... this results in issues.
4030          *
4031          * To work around this (for now) simply deauth here again if we're
4032          * now connected.
4033          */
4034         if (ifmgd->associated && !sdata->local->wowlan) {
4035                 u8 bssid[ETH_ALEN];
4036                 struct cfg80211_deauth_request req = {
4037                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4038                         .bssid = bssid,
4039                 };
4040
4041                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4042                 ieee80211_mgd_deauth(sdata, &req);
4043         }
4044
4045         sdata_unlock(sdata);
4046 }
4047
4048 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4049 {
4050         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4051
4052         sdata_lock(sdata);
4053         if (!ifmgd->associated) {
4054                 sdata_unlock(sdata);
4055                 return;
4056         }
4057
4058         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4059                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4060                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4061                 ieee80211_sta_connection_lost(sdata,
4062                                               ifmgd->associated->bssid,
4063                                               WLAN_REASON_UNSPECIFIED,
4064                                               true);
4065                 sdata_unlock(sdata);
4066                 return;
4067         }
4068         sdata_unlock(sdata);
4069 }
4070 #endif
4071
4072 /* interface setup */
4073 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4074 {
4075         struct ieee80211_if_managed *ifmgd;
4076
4077         ifmgd = &sdata->u.mgd;
4078         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4079         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4080         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4081                   ieee80211_beacon_connection_loss_work);
4082         INIT_WORK(&ifmgd->csa_connection_drop_work,
4083                   ieee80211_csa_connection_drop_work);
4084         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4085         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4086                           ieee80211_tdls_peer_del_work);
4087         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4088                     (unsigned long) sdata);
4089         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4090                     (unsigned long) sdata);
4091         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4092                     (unsigned long) sdata);
4093         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4094                     (unsigned long) sdata);
4095         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4096                           ieee80211_sta_handle_tspec_ac_params_wk);
4097
4098         ifmgd->flags = 0;
4099         ifmgd->powersave = sdata->wdev.ps;
4100         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4101         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4102         ifmgd->p2p_noa_index = -1;
4103
4104         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4105                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4106         else
4107                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4108
4109         /* Setup TDLS data */
4110         spin_lock_init(&ifmgd->teardown_lock);
4111         ifmgd->teardown_skb = NULL;
4112         ifmgd->orig_teardown_skb = NULL;
4113 }
4114
4115 /* scan finished notification */
4116 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4117 {
4118         struct ieee80211_sub_if_data *sdata;
4119
4120         /* Restart STA timers */
4121         rcu_read_lock();
4122         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4123                 if (ieee80211_sdata_running(sdata))
4124                         ieee80211_restart_sta_timer(sdata);
4125         }
4126         rcu_read_unlock();
4127 }
4128
4129 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4130                                      struct cfg80211_bss *cbss)
4131 {
4132         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4133         const u8 *ht_cap_ie, *vht_cap_ie;
4134         const struct ieee80211_ht_cap *ht_cap;
4135         const struct ieee80211_vht_cap *vht_cap;
4136         u8 chains = 1;
4137
4138         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4139                 return chains;
4140
4141         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4142         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4143                 ht_cap = (void *)(ht_cap_ie + 2);
4144                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4145                 /*
4146                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4147                  *       "Tx Unequal Modulation Supported" fields.
4148                  */
4149         }
4150
4151         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4152                 return chains;
4153
4154         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4155         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4156                 u8 nss;
4157                 u16 tx_mcs_map;
4158
4159                 vht_cap = (void *)(vht_cap_ie + 2);
4160                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4161                 for (nss = 8; nss > 0; nss--) {
4162                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4163                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4164                                 break;
4165                 }
4166                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4167                 chains = max(chains, nss);
4168         }
4169
4170         return chains;
4171 }
4172
4173 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4174                                   struct cfg80211_bss *cbss)
4175 {
4176         struct ieee80211_local *local = sdata->local;
4177         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4178         const struct ieee80211_ht_cap *ht_cap = NULL;
4179         const struct ieee80211_ht_operation *ht_oper = NULL;
4180         const struct ieee80211_vht_operation *vht_oper = NULL;
4181         struct ieee80211_supported_band *sband;
4182         struct cfg80211_chan_def chandef;
4183         int ret;
4184         u32 i;
4185         bool have_80mhz;
4186
4187         sband = local->hw.wiphy->bands[cbss->channel->band];
4188
4189         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4190                           IEEE80211_STA_DISABLE_80P80MHZ |
4191                           IEEE80211_STA_DISABLE_160MHZ);
4192
4193         rcu_read_lock();
4194
4195         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4196             sband->ht_cap.ht_supported) {
4197                 const u8 *ht_oper_ie, *ht_cap_ie;
4198
4199                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4200                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4201                         ht_oper = (void *)(ht_oper_ie + 2);
4202
4203                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4204                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4205                         ht_cap = (void *)(ht_cap_ie + 2);
4206
4207                 if (!ht_cap) {
4208                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4209                         ht_oper = NULL;
4210                 }
4211         }
4212
4213         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4214             sband->vht_cap.vht_supported) {
4215                 const u8 *vht_oper_ie, *vht_cap;
4216
4217                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4218                                                    WLAN_EID_VHT_OPERATION);
4219                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4220                         vht_oper = (void *)(vht_oper_ie + 2);
4221                 if (vht_oper && !ht_oper) {
4222                         vht_oper = NULL;
4223                         sdata_info(sdata,
4224                                    "AP advertised VHT without HT, disabling both\n");
4225                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4226                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4227                 }
4228
4229                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4230                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4231                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4232                         vht_oper = NULL;
4233                 }
4234         }
4235
4236         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4237         have_80mhz = false;
4238         for (i = 0; i < sband->n_channels; i++) {
4239                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4240                                                 IEEE80211_CHAN_NO_80MHZ))
4241                         continue;
4242
4243                 have_80mhz = true;
4244                 break;
4245         }
4246
4247         if (!have_80mhz)
4248                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4249
4250         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4251                                                      cbss->channel,
4252                                                      ht_cap, ht_oper, vht_oper,
4253                                                      &chandef, false);
4254
4255         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4256                                       local->rx_chains);
4257
4258         rcu_read_unlock();
4259
4260         /* will change later if needed */
4261         sdata->smps_mode = IEEE80211_SMPS_OFF;
4262
4263         mutex_lock(&local->mtx);
4264         /*
4265          * If this fails (possibly due to channel context sharing
4266          * on incompatible channels, e.g. 80+80 and 160 sharing the
4267          * same control channel) try to use a smaller bandwidth.
4268          */
4269         ret = ieee80211_vif_use_channel(sdata, &chandef,
4270                                         IEEE80211_CHANCTX_SHARED);
4271
4272         /* don't downgrade for 5 and 10 MHz channels, though. */
4273         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4274             chandef.width == NL80211_CHAN_WIDTH_10)
4275                 goto out;
4276
4277         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4278                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4279                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4280                                                 IEEE80211_CHANCTX_SHARED);
4281         }
4282  out:
4283         mutex_unlock(&local->mtx);
4284         return ret;
4285 }
4286
4287 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4288                                      struct cfg80211_bss *cbss, bool assoc,
4289                                      bool override)
4290 {
4291         struct ieee80211_local *local = sdata->local;
4292         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4293         struct ieee80211_bss *bss = (void *)cbss->priv;
4294         struct sta_info *new_sta = NULL;
4295         struct ieee80211_supported_band *sband;
4296         bool have_sta = false;
4297         int err;
4298
4299         sband = local->hw.wiphy->bands[cbss->channel->band];
4300
4301         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4302                 return -EINVAL;
4303
4304         if (assoc) {
4305                 rcu_read_lock();
4306                 have_sta = sta_info_get(sdata, cbss->bssid);
4307                 rcu_read_unlock();
4308         }
4309
4310         if (!have_sta) {
4311                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4312                 if (!new_sta)
4313                         return -ENOMEM;
4314         }
4315
4316         if (new_sta || override) {
4317                 err = ieee80211_prep_channel(sdata, cbss);
4318                 if (err) {
4319                         if (new_sta)
4320                                 sta_info_free(local, new_sta);
4321                         return -EINVAL;
4322                 }
4323         }
4324
4325         if (new_sta) {
4326                 u32 rates = 0, basic_rates = 0;
4327                 bool have_higher_than_11mbit;
4328                 int min_rate = INT_MAX, min_rate_index = -1;
4329                 struct ieee80211_chanctx_conf *chanctx_conf;
4330                 const struct cfg80211_bss_ies *ies;
4331                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4332                 u32 rate_flags;
4333
4334                 rcu_read_lock();
4335                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4336                 if (WARN_ON(!chanctx_conf)) {
4337                         rcu_read_unlock();
4338                         sta_info_free(local, new_sta);
4339                         return -EINVAL;
4340                 }
4341                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4342                 rcu_read_unlock();
4343
4344                 ieee80211_get_rates(sband, bss->supp_rates,
4345                                     bss->supp_rates_len,
4346                                     &rates, &basic_rates,
4347                                     &have_higher_than_11mbit,
4348                                     &min_rate, &min_rate_index,
4349                                     shift, rate_flags);
4350
4351                 /*
4352                  * This used to be a workaround for basic rates missing
4353                  * in the association response frame. Now that we no
4354                  * longer use the basic rates from there, it probably
4355                  * doesn't happen any more, but keep the workaround so
4356                  * in case some *other* APs are buggy in different ways
4357                  * we can connect -- with a warning.
4358                  */
4359                 if (!basic_rates && min_rate_index >= 0) {
4360                         sdata_info(sdata,
4361                                    "No basic rates, using min rate instead\n");
4362                         basic_rates = BIT(min_rate_index);
4363                 }
4364
4365                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4366                 sdata->vif.bss_conf.basic_rates = basic_rates;
4367
4368                 /* cf. IEEE 802.11 9.2.12 */
4369                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4370                     have_higher_than_11mbit)
4371                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4372                 else
4373                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4374
4375                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4376
4377                 /* set timing information */
4378                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4379                 rcu_read_lock();
4380                 ies = rcu_dereference(cbss->beacon_ies);
4381                 if (ies) {
4382                         const u8 *tim_ie;
4383
4384                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4385                         sdata->vif.bss_conf.sync_device_ts =
4386                                 bss->device_ts_beacon;
4387                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4388                                                   ies->data, ies->len);
4389                         if (tim_ie && tim_ie[1] >= 2)
4390                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4391                         else
4392                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4393                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4394                                                TIMING_BEACON_ONLY)) {
4395                         ies = rcu_dereference(cbss->proberesp_ies);
4396                         /* must be non-NULL since beacon IEs were NULL */
4397                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4398                         sdata->vif.bss_conf.sync_device_ts =
4399                                 bss->device_ts_presp;
4400                         sdata->vif.bss_conf.sync_dtim_count = 0;
4401                 } else {
4402                         sdata->vif.bss_conf.sync_tsf = 0;
4403                         sdata->vif.bss_conf.sync_device_ts = 0;
4404                         sdata->vif.bss_conf.sync_dtim_count = 0;
4405                 }
4406                 rcu_read_unlock();
4407
4408                 /* tell driver about BSSID, basic rates and timing */
4409                 ieee80211_bss_info_change_notify(sdata,
4410                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4411                         BSS_CHANGED_BEACON_INT);
4412
4413                 if (assoc)
4414                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4415
4416                 err = sta_info_insert(new_sta);
4417                 new_sta = NULL;
4418                 if (err) {
4419                         sdata_info(sdata,
4420                                    "failed to insert STA entry for the AP (error %d)\n",
4421                                    err);
4422                         return err;
4423                 }
4424         } else
4425                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4426
4427         /* Cancel scan to ensure that nothing interferes with connection */
4428         if (local->scanning)
4429                 ieee80211_scan_cancel(local);
4430
4431         return 0;
4432 }
4433
4434 /* config hooks */
4435 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4436                        struct cfg80211_auth_request *req)
4437 {
4438         struct ieee80211_local *local = sdata->local;
4439         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4440         struct ieee80211_mgd_auth_data *auth_data;
4441         u16 auth_alg;
4442         int err;
4443
4444         /* prepare auth data structure */
4445
4446         switch (req->auth_type) {
4447         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4448                 auth_alg = WLAN_AUTH_OPEN;
4449                 break;
4450         case NL80211_AUTHTYPE_SHARED_KEY:
4451                 if (IS_ERR(local->wep_tx_tfm))
4452                         return -EOPNOTSUPP;
4453                 auth_alg = WLAN_AUTH_SHARED_KEY;
4454                 break;
4455         case NL80211_AUTHTYPE_FT:
4456                 auth_alg = WLAN_AUTH_FT;
4457                 break;
4458         case NL80211_AUTHTYPE_NETWORK_EAP:
4459                 auth_alg = WLAN_AUTH_LEAP;
4460                 break;
4461         case NL80211_AUTHTYPE_SAE:
4462                 auth_alg = WLAN_AUTH_SAE;
4463                 break;
4464         default:
4465                 return -EOPNOTSUPP;
4466         }
4467
4468         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4469                             req->ie_len, GFP_KERNEL);
4470         if (!auth_data)
4471                 return -ENOMEM;
4472
4473         auth_data->bss = req->bss;
4474
4475         if (req->sae_data_len >= 4) {
4476                 __le16 *pos = (__le16 *) req->sae_data;
4477                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4478                 auth_data->sae_status = le16_to_cpu(pos[1]);
4479                 memcpy(auth_data->data, req->sae_data + 4,
4480                        req->sae_data_len - 4);
4481                 auth_data->data_len += req->sae_data_len - 4;
4482         }
4483
4484         if (req->ie && req->ie_len) {
4485                 memcpy(&auth_data->data[auth_data->data_len],
4486                        req->ie, req->ie_len);
4487                 auth_data->data_len += req->ie_len;
4488         }
4489
4490         if (req->key && req->key_len) {
4491                 auth_data->key_len = req->key_len;
4492                 auth_data->key_idx = req->key_idx;
4493                 memcpy(auth_data->key, req->key, req->key_len);
4494         }
4495
4496         auth_data->algorithm = auth_alg;
4497
4498         /* try to authenticate/probe */
4499
4500         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4501             ifmgd->assoc_data) {
4502                 err = -EBUSY;
4503                 goto err_free;
4504         }
4505
4506         if (ifmgd->auth_data)
4507                 ieee80211_destroy_auth_data(sdata, false);
4508
4509         /* prep auth_data so we don't go into idle on disassoc */
4510         ifmgd->auth_data = auth_data;
4511
4512         if (ifmgd->associated) {
4513                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4514
4515                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4516                                        WLAN_REASON_UNSPECIFIED,
4517                                        false, frame_buf);
4518
4519                 ieee80211_report_disconnect(sdata, frame_buf,
4520                                             sizeof(frame_buf), true,
4521                                             WLAN_REASON_UNSPECIFIED);
4522         }
4523
4524         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4525
4526         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4527         if (err)
4528                 goto err_clear;
4529
4530         err = ieee80211_auth(sdata);
4531         if (err) {
4532                 sta_info_destroy_addr(sdata, req->bss->bssid);
4533                 goto err_clear;
4534         }
4535
4536         /* hold our own reference */
4537         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4538         return 0;
4539
4540  err_clear:
4541         eth_zero_addr(ifmgd->bssid);
4542         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4543         ifmgd->auth_data = NULL;
4544         mutex_lock(&sdata->local->mtx);
4545         ieee80211_vif_release_channel(sdata);
4546         mutex_unlock(&sdata->local->mtx);
4547  err_free:
4548         kfree(auth_data);
4549         return err;
4550 }
4551
4552 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4553                                         const u8 *wmm_param, int len)
4554 {
4555         const u8 *pos;
4556         size_t left;
4557
4558         if (len < 8)
4559                 return false;
4560
4561         if (wmm_param[5] != 1 /* version */)
4562                 return false;
4563
4564         pos = wmm_param + 8;
4565         left = len - 8;
4566
4567         for (; left >= 4; left -= 4, pos += 4) {
4568                 u8 aifsn = pos[0] & 0x0f;
4569                 u8 ecwmin = pos[1] & 0x0f;
4570                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4571                 int aci = (pos[0] >> 5) & 0x03;
4572
4573                 if (aifsn < 2) {
4574                         sdata_info(sdata,
4575                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4576                                    aifsn, aci);
4577                         return false;
4578                 }
4579                 if (ecwmin > ecwmax) {
4580                         sdata_info(sdata,
4581                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4582                                    ecwmin, ecwmax, aci);
4583                         return false;
4584                 }
4585         }
4586
4587         return true;
4588 }
4589
4590 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4591                         struct cfg80211_assoc_request *req)
4592 {
4593         struct ieee80211_local *local = sdata->local;
4594         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4595         struct ieee80211_bss *bss = (void *)req->bss->priv;
4596         struct ieee80211_mgd_assoc_data *assoc_data;
4597         const struct cfg80211_bss_ies *beacon_ies;
4598         struct ieee80211_supported_band *sband;
4599         const u8 *ssidie, *ht_ie, *vht_ie;
4600         int i, err;
4601         bool override = false;
4602
4603         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4604         if (!assoc_data)
4605                 return -ENOMEM;
4606
4607         rcu_read_lock();
4608         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4609         if (!ssidie) {
4610                 rcu_read_unlock();
4611                 kfree(assoc_data);
4612                 return -EINVAL;
4613         }
4614         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4615         assoc_data->ssid_len = ssidie[1];
4616         rcu_read_unlock();
4617
4618         if (ifmgd->associated) {
4619                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4620
4621                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4622                                        WLAN_REASON_UNSPECIFIED,
4623                                        false, frame_buf);
4624
4625                 ieee80211_report_disconnect(sdata, frame_buf,
4626                                             sizeof(frame_buf), true,
4627                                             WLAN_REASON_UNSPECIFIED);
4628         }
4629
4630         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4631                 err = -EBUSY;
4632                 goto err_free;
4633         }
4634
4635         if (ifmgd->assoc_data) {
4636                 err = -EBUSY;
4637                 goto err_free;
4638         }
4639
4640         if (ifmgd->auth_data) {
4641                 bool match;
4642
4643                 /* keep sta info, bssid if matching */
4644                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4645                 ieee80211_destroy_auth_data(sdata, match);
4646         }
4647
4648         /* prepare assoc data */
4649
4650         ifmgd->beacon_crc_valid = false;
4651
4652         assoc_data->wmm = bss->wmm_used &&
4653                           (local->hw.queues >= IEEE80211_NUM_ACS);
4654         if (assoc_data->wmm) {
4655                 /* try to check validity of WMM params IE */
4656                 const struct cfg80211_bss_ies *ies;
4657                 const u8 *wp, *start, *end;
4658
4659                 rcu_read_lock();
4660                 ies = rcu_dereference(req->bss->ies);
4661                 start = ies->data;
4662                 end = start + ies->len;
4663
4664                 while (true) {
4665                         wp = cfg80211_find_vendor_ie(
4666                                 WLAN_OUI_MICROSOFT,
4667                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4668                                 start, end - start);
4669                         if (!wp)
4670                                 break;
4671                         start = wp + wp[1] + 2;
4672                         /* if this IE is too short, try the next */
4673                         if (wp[1] <= 4)
4674                                 continue;
4675                         /* if this IE is WMM params, we found what we wanted */
4676                         if (wp[6] == 1)
4677                                 break;
4678                 }
4679
4680                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4681                                                         wp[1] - 2)) {
4682                         assoc_data->wmm = false;
4683                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4684                 }
4685                 rcu_read_unlock();
4686         }
4687
4688         /*
4689          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4690          * We still associate in non-HT mode (11a/b/g) if any one of these
4691          * ciphers is configured as pairwise.
4692          * We can set this to true for non-11n hardware, that'll be checked
4693          * separately along with the peer capabilities.
4694          */
4695         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4696                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4697                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4698                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4699                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4700                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4701                         netdev_info(sdata->dev,
4702                                     "disabling HT/VHT due to WEP/TKIP use\n");
4703                 }
4704         }
4705
4706         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4707         sband = local->hw.wiphy->bands[req->bss->channel->band];
4708         if (!sband->ht_cap.ht_supported ||
4709             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4710             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4711                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4712                 if (!bss->wmm_used &&
4713                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4714                         netdev_info(sdata->dev,
4715                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4716         }
4717
4718         /* disable VHT if we don't support it or the AP doesn't use WMM */
4719         if (!sband->vht_cap.vht_supported ||
4720             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4721             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4722                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4723                 if (!bss->wmm_used &&
4724                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4725                         netdev_info(sdata->dev,
4726                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4727         }
4728
4729         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4730         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4731                sizeof(ifmgd->ht_capa_mask));
4732
4733         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4734         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4735                sizeof(ifmgd->vht_capa_mask));
4736
4737         if (req->ie && req->ie_len) {
4738                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4739                 assoc_data->ie_len = req->ie_len;
4740         }
4741
4742         assoc_data->bss = req->bss;
4743
4744         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4745                 if (ifmgd->powersave)
4746                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4747                 else
4748                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4749         } else
4750                 sdata->smps_mode = ifmgd->req_smps;
4751
4752         assoc_data->capability = req->bss->capability;
4753         assoc_data->supp_rates = bss->supp_rates;
4754         assoc_data->supp_rates_len = bss->supp_rates_len;
4755
4756         rcu_read_lock();
4757         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4758         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4759                 assoc_data->ap_ht_param =
4760                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4761         else
4762                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4763         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4764         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4765                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4766                        sizeof(struct ieee80211_vht_cap));
4767         else
4768                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4769         rcu_read_unlock();
4770
4771         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4772                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4773              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4774                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4775
4776         if (bss->wmm_used && bss->uapsd_supported &&
4777             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4778                 assoc_data->uapsd = true;
4779                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4780         } else {
4781                 assoc_data->uapsd = false;
4782                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4783         }
4784
4785         if (req->prev_bssid)
4786                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4787
4788         if (req->use_mfp) {
4789                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4790                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4791         } else {
4792                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4793                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4794         }
4795
4796         if (req->flags & ASSOC_REQ_USE_RRM)
4797                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4798         else
4799                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4800
4801         if (req->crypto.control_port)
4802                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4803         else
4804                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4805
4806         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4807         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4808         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4809                                                         sdata->vif.type);
4810
4811         /* kick off associate process */
4812
4813         ifmgd->assoc_data = assoc_data;
4814         ifmgd->dtim_period = 0;
4815         ifmgd->have_beacon = false;
4816
4817         /* override HT/VHT configuration only if the AP and we support it */
4818         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4819                 struct ieee80211_sta_ht_cap sta_ht_cap;
4820
4821                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4822                         override = true;
4823
4824                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4825                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4826
4827                 /* check for 40 MHz disable override */
4828                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4829                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4830                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4831                         override = true;
4832
4833                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4834                     req->flags & ASSOC_REQ_DISABLE_VHT)
4835                         override = true;
4836         }
4837
4838         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4839                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4840                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4841         }
4842
4843         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4844                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4845
4846         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4847         if (err)
4848                 goto err_clear;
4849
4850         rcu_read_lock();
4851         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4852
4853         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4854             !beacon_ies) {
4855                 /*
4856                  * Wait up to one beacon interval ...
4857                  * should this be more if we miss one?
4858                  */
4859                 sdata_info(sdata, "waiting for beacon from %pM\n",
4860                            ifmgd->bssid);
4861                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4862                 assoc_data->timeout_started = true;
4863                 assoc_data->need_beacon = true;
4864         } else if (beacon_ies) {
4865                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4866                                                     beacon_ies->data,
4867                                                     beacon_ies->len);
4868                 u8 dtim_count = 0;
4869
4870                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4871                         const struct ieee80211_tim_ie *tim;
4872                         tim = (void *)(tim_ie + 2);
4873                         ifmgd->dtim_period = tim->dtim_period;
4874                         dtim_count = tim->dtim_count;
4875                 }
4876                 ifmgd->have_beacon = true;
4877                 assoc_data->timeout = jiffies;
4878                 assoc_data->timeout_started = true;
4879
4880                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4881                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4882                         sdata->vif.bss_conf.sync_device_ts =
4883                                 bss->device_ts_beacon;
4884                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4885                 }
4886         } else {
4887                 assoc_data->timeout = jiffies;
4888                 assoc_data->timeout_started = true;
4889         }
4890         rcu_read_unlock();
4891
4892         run_again(sdata, assoc_data->timeout);
4893
4894         if (bss->corrupt_data) {
4895                 char *corrupt_type = "data";
4896                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4897                         if (bss->corrupt_data &
4898                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4899                                 corrupt_type = "beacon and probe response";
4900                         else
4901                                 corrupt_type = "beacon";
4902                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4903                         corrupt_type = "probe response";
4904                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4905                            corrupt_type);
4906         }
4907
4908         return 0;
4909  err_clear:
4910         eth_zero_addr(ifmgd->bssid);
4911         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4912         ifmgd->assoc_data = NULL;
4913  err_free:
4914         kfree(assoc_data);
4915         return err;
4916 }
4917
4918 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4919                          struct cfg80211_deauth_request *req)
4920 {
4921         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4922         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4923         bool tx = !req->local_state_change;
4924
4925         if (ifmgd->auth_data &&
4926             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4927                 sdata_info(sdata,
4928                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4929                            req->bssid, req->reason_code,
4930                            ieee80211_get_reason_code_string(req->reason_code));
4931
4932                 drv_mgd_prepare_tx(sdata->local, sdata);
4933                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4934                                                IEEE80211_STYPE_DEAUTH,
4935                                                req->reason_code, tx,
4936                                                frame_buf);
4937                 ieee80211_destroy_auth_data(sdata, false);
4938                 ieee80211_report_disconnect(sdata, frame_buf,
4939                                             sizeof(frame_buf), true,
4940                                             req->reason_code);
4941
4942                 return 0;
4943         }
4944
4945         if (ifmgd->associated &&
4946             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4947                 sdata_info(sdata,
4948                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4949                            req->bssid, req->reason_code,
4950                            ieee80211_get_reason_code_string(req->reason_code));
4951
4952                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4953                                        req->reason_code, tx, frame_buf);
4954                 ieee80211_report_disconnect(sdata, frame_buf,
4955                                             sizeof(frame_buf), true,
4956                                             req->reason_code);
4957                 return 0;
4958         }
4959
4960         return -ENOTCONN;
4961 }
4962
4963 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4964                            struct cfg80211_disassoc_request *req)
4965 {
4966         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4967         u8 bssid[ETH_ALEN];
4968         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4969
4970         /*
4971          * cfg80211 should catch this ... but it's racy since
4972          * we can receive a disassoc frame, process it, hand it
4973          * to cfg80211 while that's in a locked section already
4974          * trying to tell us that the user wants to disconnect.
4975          */
4976         if (ifmgd->associated != req->bss)
4977                 return -ENOLINK;
4978
4979         sdata_info(sdata,
4980                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4981                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4982
4983         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4984         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4985                                req->reason_code, !req->local_state_change,
4986                                frame_buf);
4987
4988         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4989                                     req->reason_code);
4990
4991         return 0;
4992 }
4993
4994 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4995 {
4996         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4997
4998         /*
4999          * Make sure some work items will not run after this,
5000          * they will not do anything but might not have been
5001          * cancelled when disconnecting.
5002          */
5003         cancel_work_sync(&ifmgd->monitor_work);
5004         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5005         cancel_work_sync(&ifmgd->request_smps_work);
5006         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5007         cancel_work_sync(&ifmgd->chswitch_work);
5008         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5009
5010         sdata_lock(sdata);
5011         if (ifmgd->assoc_data) {
5012                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5013                 ieee80211_destroy_assoc_data(sdata, false);
5014                 cfg80211_assoc_timeout(sdata->dev, bss);
5015         }
5016         if (ifmgd->auth_data)
5017                 ieee80211_destroy_auth_data(sdata, false);
5018         spin_lock_bh(&ifmgd->teardown_lock);
5019         if (ifmgd->teardown_skb) {
5020                 kfree_skb(ifmgd->teardown_skb);
5021                 ifmgd->teardown_skb = NULL;
5022                 ifmgd->orig_teardown_skb = NULL;
5023         }
5024         spin_unlock_bh(&ifmgd->teardown_lock);
5025         del_timer_sync(&ifmgd->timer);
5026         sdata_unlock(sdata);
5027 }
5028
5029 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5030                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5031                                gfp_t gfp)
5032 {
5033         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5034
5035         trace_api_cqm_rssi_notify(sdata, rssi_event);
5036
5037         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5038 }
5039 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5040
5041 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5042 {
5043         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5044
5045         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5046
5047         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5048 }
5049 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);