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/pm_qos.h>
  24 #include <linux/crc32.h>
  25 #include <linux/slab.h>
  26 #include <linux/export.h>
  27 #include <net/mac80211.h>
  28 #include <asm/unaligned.h>
  29
  30 #include "ieee80211_i.h"
  31 #include "driver-ops.h"
  32 #include "rate.h"
  33 #include "led.h"
  34
  35 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  36 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  37 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  38 #define IEEE80211_AUTH_MAX_TRIES        3
  39 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  40 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  41 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  42 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  43 #define IEEE80211_ASSOC_MAX_TRIES       3
  44
  45 static int max_nullfunc_tries = 2;
  46 module_param(max_nullfunc_tries, int, 0644);
  47 MODULE_PARM_DESC(max_nullfunc_tries,
  48                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  49
  50 static int max_probe_tries = 5;
  51 module_param(max_probe_tries, int, 0644);
  52 MODULE_PARM_DESC(max_probe_tries,
  53                  "Maximum probe tries before disconnecting (reason 4).");
  54
  55 /*
  56  * Beacon loss timeout is calculated as N frames times the
  57  * advertised beacon interval.  This may need to be somewhat
  58  * higher than what hardware might detect to account for
  59  * delays in the host processing frames. But since we also
  60  * probe on beacon miss before declaring the connection lost
  61  * default to what we want.
  62  */
  63 static int beacon_loss_count = 7;
  64 module_param(beacon_loss_count, int, 0644);
  65 MODULE_PARM_DESC(beacon_loss_count,
  66                  "Number of beacon intervals before we decide beacon was lost.");
  67
  68 /*
  69  * Time the connection can be idle before we probe
  70  * it to see if we can still talk to the AP.
  71  */
  72 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  73 /*
  74  * Time we wait for a probe response after sending
  75  * a probe request because of beacon loss or for
  76  * checking the connection still works.
  77  */
  78 static int probe_wait_ms = 500;
  79 module_param(probe_wait_ms, int, 0644);
  80 MODULE_PARM_DESC(probe_wait_ms,
  81                  "Maximum time(ms) to wait for probe response"
  82                  " before disconnecting (reason 4).");
  83
  84 /*
  85  * Weight given to the latest Beacon frame when calculating average signal
  86  * strength for Beacon frames received in the current BSS. This must be
  87  * between 1 and 15.
  88  */
  89 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  90
  91 /*
  92  * How many Beacon frames need to have been used in average signal strength
  93  * before starting to indicate signal change events.
  94  */
  95 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  96
  97 /*
  98  * We can have multiple work items (and connection probing)
  99  * scheduling this timer, but we need to take care to only
 100  * reschedule it when it should fire _earlier_ than it was
 101  * asked for before, or if it's not pending right now. This
 102  * function ensures that. Note that it then is required to
 103  * run this function for all timeouts after the first one
 104  * has happened -- the work that runs from this timer will
 105  * do that.
 106  */
 107 static void run_again(struct ieee80211_sub_if_data *sdata,
 108                       unsigned long timeout)
 109 {
 110         sdata_assert_lock(sdata);
 111
 112         if (!timer_pending(&sdata->u.mgd.timer) ||
 113             time_before(timeout, sdata->u.mgd.timer.expires))
 114                 mod_timer(&sdata->u.mgd.timer, timeout);
 115 }
 116
 117 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 118 {
 119         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 120                 return;
 121
 122         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 123                 return;
 124
 125         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 126                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 127 }
 128
 129 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 130 {
 131         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 132
 133         if (unlikely(!sdata->u.mgd.associated))
 134                 return;
 135
 136         ifmgd->probe_send_count = 0;
 137
 138         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 139                 return;
 140
 141         mod_timer(&sdata->u.mgd.conn_mon_timer,
 142                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 143 }
 144
 145 static int ecw2cw(int ecw)
 146 {
 147         return (1 << ecw) - 1;
 148 }
 149
 150 static u32
 151 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 152                              struct ieee80211_supported_band *sband,
 153                              struct ieee80211_channel *channel,
 154                              const struct ieee80211_ht_cap *ht_cap,
 155                              const struct ieee80211_ht_operation *ht_oper,
 156                              const struct ieee80211_vht_operation *vht_oper,
 157                              struct cfg80211_chan_def *chandef, bool tracking)
 158 {
 159         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 160         struct cfg80211_chan_def vht_chandef;
 161         struct ieee80211_sta_ht_cap sta_ht_cap;
 162         u32 ht_cfreq, ret;
 163
 164         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 165         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 166
 167         chandef->chan = channel;
 168         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 169         chandef->center_freq1 = channel->center_freq;
 170         chandef->center_freq2 = 0;
 171
 172         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 173                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 174                 goto out;
 175         }
 176
 177         chandef->width = NL80211_CHAN_WIDTH_20;
 178
 179         if (!(ht_cap->cap_info &
 180               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 181                 ret = IEEE80211_STA_DISABLE_40MHZ;
 182                 vht_chandef = *chandef;
 183                 goto out;
 184         }
 185
 186         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 187                                                   channel->band);
 188         /* check that channel matches the right operating channel */
 189         if (!tracking && channel->center_freq != ht_cfreq) {
 190                 /*
 191                  * It's possible that some APs are confused here;
 192                  * Netgear WNDR3700 sometimes reports 4 higher than
 193                  * the actual channel in association responses, but
 194                  * since we look at probe response/beacon data here
 195                  * it should be OK.
 196                  */
 197                 sdata_info(sdata,
 198                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 199                            channel->center_freq, ht_cfreq,
 200                            ht_oper->primary_chan, channel->band);
 201                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 202                 goto out;
 203         }
 204
 205         /* check 40 MHz support, if we have it */
 206         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 207                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 208                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 209                         chandef->width = NL80211_CHAN_WIDTH_40;
 210                         chandef->center_freq1 += 10;
 211                         break;
 212                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 213                         chandef->width = NL80211_CHAN_WIDTH_40;
 214                         chandef->center_freq1 -= 10;
 215                         break;
 216                 }
 217         } else {
 218                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 219                 ret = IEEE80211_STA_DISABLE_VHT;
 220                 /* also mark 40 MHz disabled */
 221                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 222                 goto out;
 223         }
 224
 225         if (!vht_oper || !sband->vht_cap.vht_supported) {
 226                 ret = IEEE80211_STA_DISABLE_VHT;
 227                 goto out;
 228         }
 229
 230         vht_chandef.chan = channel;
 231         vht_chandef.center_freq1 =
 232                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 233                                                channel->band);
 234         vht_chandef.center_freq2 = 0;
 235
 236         switch (vht_oper->chan_width) {
 237         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 238                 vht_chandef.width = chandef->width;
 239                 vht_chandef.center_freq1 = chandef->center_freq1;
 240                 break;
 241         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 242                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 243                 break;
 244         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 245                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 246                 break;
 247         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 248                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 249                 vht_chandef.center_freq2 =
 250                         ieee80211_channel_to_frequency(
 251                                 vht_oper->center_freq_seg2_idx,
 252                                 channel->band);
 253                 break;
 254         default:
 255                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 256                         sdata_info(sdata,
 257                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 258                                    vht_oper->chan_width);
 259                 ret = IEEE80211_STA_DISABLE_VHT;
 260                 goto out;
 261         }
 262
 263         if (!cfg80211_chandef_valid(&vht_chandef)) {
 264                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 265                         sdata_info(sdata,
 266                                    "AP VHT information is invalid, disable VHT\n");
 267                 ret = IEEE80211_STA_DISABLE_VHT;
 268                 goto out;
 269         }
 270
 271         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 272                 ret = 0;
 273                 goto out;
 274         }
 275
 276         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 277                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 278                         sdata_info(sdata,
 279                                    "AP VHT information doesn't match HT, disable VHT\n");
 280                 ret = IEEE80211_STA_DISABLE_VHT;
 281                 goto out;
 282         }
 283
 284         *chandef = vht_chandef;
 285
 286         ret = 0;
 287
 288 out:
 289         /*
 290          * When tracking the current AP, don't do any further checks if the
 291          * new chandef is identical to the one we're currently using for the
 292          * connection. This keeps us from playing ping-pong with regulatory,
 293          * without it the following can happen (for example):
 294          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 295          *  - AP advertises regdom US
 296          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 297          *  - the code below detects an unsupported channel, downgrades, and
 298          *    we disconnect from the AP in the caller
 299          *  - disconnect causes CRDA to reload world regdomain and the game
 300          *    starts anew.
 301          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 302          *
 303          * It seems possible that there are still scenarios with CSA or real
 304          * bandwidth changes where a this could happen, but those cases are
 305          * less common and wouldn't completely prevent using the AP.
 306          */
 307         if (tracking &&
 308             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 309                 return ret;
 310
 311         /* don't print the message below for VHT mismatch if VHT is disabled */
 312         if (ret & IEEE80211_STA_DISABLE_VHT)
 313                 vht_chandef = *chandef;
 314
 315         /*
 316          * Ignore the DISABLED flag when we're already connected and only
 317          * tracking the APs beacon for bandwidth changes - otherwise we
 318          * might get disconnected here if we connect to an AP, update our
 319          * regulatory information based on the AP's country IE and the
 320          * information we have is wrong/outdated and disables the channel
 321          * that we're actually using for the connection to the AP.
 322          */
 323         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 324                                         tracking ? 0 :
 325                                                    IEEE80211_CHAN_DISABLED)) {
 326                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 327                         ret = IEEE80211_STA_DISABLE_HT |
 328                               IEEE80211_STA_DISABLE_VHT;
 329                         break;
 330                 }
 331
 332                 ret |= ieee80211_chandef_downgrade(chandef);
 333         }
 334
 335         if (chandef->width != vht_chandef.width && !tracking)
 336                 sdata_info(sdata,
 337                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 338
 339         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 340         return ret;
 341 }
 342
 343 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 344                                struct sta_info *sta,
 345                                const struct ieee80211_ht_cap *ht_cap,
 346                                const struct ieee80211_ht_operation *ht_oper,
 347                                const struct ieee80211_vht_operation *vht_oper,
 348                                const u8 *bssid, u32 *changed)
 349 {
 350         struct ieee80211_local *local = sdata->local;
 351         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 352         struct ieee80211_supported_band *sband;
 353         struct ieee80211_channel *chan;
 354         struct cfg80211_chan_def chandef;
 355         u16 ht_opmode;
 356         u32 flags;
 357         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 358         int ret;
 359
 360         /* if HT was/is disabled, don't track any bandwidth changes */
 361         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 362                 return 0;
 363
 364         /* don't check VHT if we associated as non-VHT station */
 365         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 366                 vht_oper = NULL;
 367
 368         if (WARN_ON_ONCE(!sta))
 369                 return -EINVAL;
 370
 371         /*
 372          * if bss configuration changed store the new one -
 373          * this may be applicable even if channel is identical
 374          */
 375         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 376         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 377                 *changed |= BSS_CHANGED_HT;
 378                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 379         }
 380
 381         chan = sdata->vif.bss_conf.chandef.chan;
 382         sband = local->hw.wiphy->bands[chan->band];
 383
 384         /* calculate new channel (type) based on HT/VHT operation IEs */
 385         flags = ieee80211_determine_chantype(sdata, sband, chan,
 386                                              ht_cap, ht_oper, vht_oper,
 387                                              &chandef, true);
 388
 389         /*
 390          * Downgrade the new channel if we associated with restricted
 391          * capabilities. For example, if we associated as a 20 MHz STA
 392          * to a 40 MHz AP (due to regulatory, capabilities or config
 393          * reasons) then switching to a 40 MHz channel now won't do us
 394          * any good -- we couldn't use it with the AP.
 395          */
 396         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 397             chandef.width == NL80211_CHAN_WIDTH_80P80)
 398                 flags |= ieee80211_chandef_downgrade(&chandef);
 399         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 400             chandef.width == NL80211_CHAN_WIDTH_160)
 401                 flags |= ieee80211_chandef_downgrade(&chandef);
 402         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 403             chandef.width > NL80211_CHAN_WIDTH_20)
 404                 flags |= ieee80211_chandef_downgrade(&chandef);
 405
 406         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 407                 return 0;
 408
 409         sdata_info(sdata,
 410                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 411                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 412                    chandef.center_freq1, chandef.center_freq2);
 413
 414         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 415                                       IEEE80211_STA_DISABLE_VHT |
 416                                       IEEE80211_STA_DISABLE_40MHZ |
 417                                       IEEE80211_STA_DISABLE_80P80MHZ |
 418                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 419             !cfg80211_chandef_valid(&chandef)) {
 420                 sdata_info(sdata,
 421                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 422                            ifmgd->bssid);
 423                 return -EINVAL;
 424         }
 425
 426         switch (chandef.width) {
 427         case NL80211_CHAN_WIDTH_20_NOHT:
 428         case NL80211_CHAN_WIDTH_20:
 429                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 430                 break;
 431         case NL80211_CHAN_WIDTH_40:
 432                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 433                 break;
 434         case NL80211_CHAN_WIDTH_80:
 435                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 436                 break;
 437         case NL80211_CHAN_WIDTH_80P80:
 438         case NL80211_CHAN_WIDTH_160:
 439                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 440                 break;
 441         default:
 442                 return -EINVAL;
 443         }
 444
 445         if (new_sta_bw > sta->cur_max_bandwidth)
 446                 new_sta_bw = sta->cur_max_bandwidth;
 447
 448         if (new_sta_bw < sta->sta.bandwidth) {
 449                 sta->sta.bandwidth = new_sta_bw;
 450                 rate_control_rate_update(local, sband, sta,
 451                                          IEEE80211_RC_BW_CHANGED);
 452         }
 453
 454         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 455         if (ret) {
 456                 sdata_info(sdata,
 457                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 458                            ifmgd->bssid);
 459                 return ret;
 460         }
 461
 462         if (new_sta_bw > sta->sta.bandwidth) {
 463                 sta->sta.bandwidth = new_sta_bw;
 464                 rate_control_rate_update(local, sband, sta,
 465                                          IEEE80211_RC_BW_CHANGED);
 466         }
 467
 468         return 0;
 469 }
 470
 471 /* frame sending functions */
 472
 473 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 474                                 struct sk_buff *skb, u8 ap_ht_param,
 475                                 struct ieee80211_supported_band *sband,
 476                                 struct ieee80211_channel *channel,
 477                                 enum ieee80211_smps_mode smps)
 478 {
 479         u8 *pos;
 480         u32 flags = channel->flags;
 481         u16 cap;
 482         struct ieee80211_sta_ht_cap ht_cap;
 483
 484         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 485
 486         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 487         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 488
 489         /* determine capability flags */
 490         cap = ht_cap.cap;
 491
 492         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 493         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 494                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 495                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 496                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 497                 }
 498                 break;
 499         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 500                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 501                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 502                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 503                 }
 504                 break;
 505         }
 506
 507         /*
 508          * If 40 MHz was disabled associate as though we weren't
 509          * capable of 40 MHz -- some broken APs will never fall
 510          * back to trying to transmit in 20 MHz.
 511          */
 512         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 513                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 514                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 515         }
 516
 517         /* set SM PS mode properly */
 518         cap &= ~IEEE80211_HT_CAP_SM_PS;
 519         switch (smps) {
 520         case IEEE80211_SMPS_AUTOMATIC:
 521         case IEEE80211_SMPS_NUM_MODES:
 522                 WARN_ON(1);
 523         case IEEE80211_SMPS_OFF:
 524                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 525                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 526                 break;
 527         case IEEE80211_SMPS_STATIC:
 528                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 529                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 530                 break;
 531         case IEEE80211_SMPS_DYNAMIC:
 532                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 533                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 534                 break;
 535         }
 536
 537         /* reserve and fill IE */
 538         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 539         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 540 }
 541
 542 /* This function determines vht capability flags for the association
 543  * and builds the IE.
 544  * Note - the function may set the owner of the MU-MIMO capability
 545  */
 546 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 547                                  struct sk_buff *skb,
 548                                  struct ieee80211_supported_band *sband,
 549                                  struct ieee80211_vht_cap *ap_vht_cap)
 550 {
 551         struct ieee80211_local *local = sdata->local;
 552         u8 *pos;
 553         u32 cap;
 554         struct ieee80211_sta_vht_cap vht_cap;
 555         u32 mask, ap_bf_sts, our_bf_sts;
 556
 557         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 558
 559         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 560         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 561
 562         /* determine capability flags */
 563         cap = vht_cap.cap;
 564
 565         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 566                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 567
 568                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 569                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 570                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 571                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 572         }
 573
 574         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 575                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 576                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 577         }
 578
 579         /*
 580          * Some APs apparently get confused if our capabilities are better
 581          * than theirs, so restrict what we advertise in the assoc request.
 582          */
 583         if (!(ap_vht_cap->vht_cap_info &
 584                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 585                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 586                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 587         else if (!(ap_vht_cap->vht_cap_info &
 588                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 589                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 590
 591         /*
 592          * If some other vif is using the MU-MIMO capablity we cannot associate
 593          * using MU-MIMO - this will lead to contradictions in the group-id
 594          * mechanism.
 595          * Ownership is defined since association request, in order to avoid
 596          * simultaneous associations with MU-MIMO.
 597          */
 598         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 599                 bool disable_mu_mimo = false;
 600                 struct ieee80211_sub_if_data *other;
 601
 602                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 603                         if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
 604                                 disable_mu_mimo = true;
 605                                 break;
 606                         }
 607                 }
 608                 if (disable_mu_mimo)
 609                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 610                 else
 611                         sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
 612         }
 613
 614         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 615
 616         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 617         our_bf_sts = cap & mask;
 618
 619         if (ap_bf_sts < our_bf_sts) {
 620                 cap &= ~mask;
 621                 cap |= ap_bf_sts;
 622         }
 623
 624         /* reserve and fill IE */
 625         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 626         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 627 }
 628
 629 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 630 {
 631         struct ieee80211_local *local = sdata->local;
 632         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 633         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 634         struct sk_buff *skb;
 635         struct ieee80211_mgmt *mgmt;
 636         u8 *pos, qos_info;
 637         size_t offset = 0, noffset;
 638         int i, count, rates_len, supp_rates_len, shift;
 639         u16 capab;
 640         struct ieee80211_supported_band *sband;
 641         struct ieee80211_chanctx_conf *chanctx_conf;
 642         struct ieee80211_channel *chan;
 643         u32 rate_flags, rates = 0;
 644
 645         sdata_assert_lock(sdata);
 646
 647         rcu_read_lock();
 648         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 649         if (WARN_ON(!chanctx_conf)) {
 650                 rcu_read_unlock();
 651                 return;
 652         }
 653         chan = chanctx_conf->def.chan;
 654         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 655         rcu_read_unlock();
 656         sband = local->hw.wiphy->bands[chan->band];
 657         shift = ieee80211_vif_get_shift(&sdata->vif);
 658
 659         if (assoc_data->supp_rates_len) {
 660                 /*
 661                  * Get all rates supported by the device and the AP as
 662                  * some APs don't like getting a superset of their rates
 663                  * in the association request (e.g. D-Link DAP 1353 in
 664                  * b-only mode)...
 665                  */
 666                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 667                                                      assoc_data->supp_rates,
 668                                                      assoc_data->supp_rates_len,
 669                                                      &rates);
 670         } else {
 671                 /*
 672                  * In case AP not provide any supported rates information
 673                  * before association, we send information element(s) with
 674                  * all rates that we support.
 675                  */
 676                 rates_len = 0;
 677                 for (i = 0; i < sband->n_bitrates; i++) {
 678                         if ((rate_flags & sband->bitrates[i].flags)
 679                             != rate_flags)
 680                                 continue;
 681                         rates |= BIT(i);
 682                         rates_len++;
 683                 }
 684         }
 685
 686         skb = alloc_skb(local->hw.extra_tx_headroom +
 687                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 688                         2 + assoc_data->ssid_len + /* SSID */
 689                         4 + rates_len + /* (extended) rates */
 690                         4 + /* power capability */
 691                         2 + 2 * sband->n_channels + /* supported channels */
 692                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 693                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 694                         assoc_data->ie_len + /* extra IEs */
 695                         9, /* WMM */
 696                         GFP_KERNEL);
 697         if (!skb)
 698                 return;
 699
 700         skb_reserve(skb, local->hw.extra_tx_headroom);
 701
 702         capab = WLAN_CAPABILITY_ESS;
 703
 704         if (sband->band == IEEE80211_BAND_2GHZ) {
 705                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 706                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 707         }
 708
 709         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 710                 capab |= WLAN_CAPABILITY_PRIVACY;
 711
 712         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 713             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 714                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 715
 716         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 717                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 718
 719         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 720         memset(mgmt, 0, 24);
 721         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 722         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 723         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 724
 725         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 726                 skb_put(skb, 10);
 727                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 728                                                   IEEE80211_STYPE_REASSOC_REQ);
 729                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 730                 mgmt->u.reassoc_req.listen_interval =
 731                                 cpu_to_le16(local->hw.conf.listen_interval);
 732                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 733                        ETH_ALEN);
 734         } else {
 735                 skb_put(skb, 4);
 736                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 737                                                   IEEE80211_STYPE_ASSOC_REQ);
 738                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 739                 mgmt->u.assoc_req.listen_interval =
 740                                 cpu_to_le16(local->hw.conf.listen_interval);
 741         }
 742
 743         /* SSID */
 744         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 745         *pos++ = WLAN_EID_SSID;
 746         *pos++ = assoc_data->ssid_len;
 747         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 748
 749         /* add all rates which were marked to be used above */
 750         supp_rates_len = rates_len;
 751         if (supp_rates_len > 8)
 752                 supp_rates_len = 8;
 753
 754         pos = skb_put(skb, supp_rates_len + 2);
 755         *pos++ = WLAN_EID_SUPP_RATES;
 756         *pos++ = supp_rates_len;
 757
 758         count = 0;
 759         for (i = 0; i < sband->n_bitrates; i++) {
 760                 if (BIT(i) & rates) {
 761                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 762                                                 5 * (1 << shift));
 763                         *pos++ = (u8) rate;
 764                         if (++count == 8)
 765                                 break;
 766                 }
 767         }
 768
 769         if (rates_len > count) {
 770                 pos = skb_put(skb, rates_len - count + 2);
 771                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 772                 *pos++ = rates_len - count;
 773
 774                 for (i++; i < sband->n_bitrates; i++) {
 775                         if (BIT(i) & rates) {
 776                                 int rate;
 777                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 778                                                     5 * (1 << shift));
 779                                 *pos++ = (u8) rate;
 780                         }
 781                 }
 782         }
 783
 784         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 785             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 786                 pos = skb_put(skb, 4);
 787                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 788                 *pos++ = 2;
 789                 *pos++ = 0; /* min tx power */
 790                  /* max tx power */
 791                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 792         }
 793
 794         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 795                 /* TODO: get this in reg domain format */
 796                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 797                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 798                 *pos++ = 2 * sband->n_channels;
 799                 for (i = 0; i < sband->n_channels; i++) {
 800                         *pos++ = ieee80211_frequency_to_channel(
 801                                         sband->channels[i].center_freq);
 802                         *pos++ = 1; /* one channel in the subband*/
 803                 }
 804         }
 805
 806         /* if present, add any custom IEs that go before HT */
 807         if (assoc_data->ie_len) {
 808                 static const u8 before_ht[] = {
 809                         WLAN_EID_SSID,
 810                         WLAN_EID_SUPP_RATES,
 811                         WLAN_EID_EXT_SUPP_RATES,
 812                         WLAN_EID_PWR_CAPABILITY,
 813                         WLAN_EID_SUPPORTED_CHANNELS,
 814                         WLAN_EID_RSN,
 815                         WLAN_EID_QOS_CAPA,
 816                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 817                         WLAN_EID_MOBILITY_DOMAIN,
 818                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 819                         WLAN_EID_RIC_DATA,              /* reassoc only */
 820                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 821                 };
 822                 static const u8 after_ric[] = {
 823                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 824                         WLAN_EID_HT_CAPABILITY,
 825                         WLAN_EID_BSS_COEX_2040,
 826                         WLAN_EID_EXT_CAPABILITY,
 827                         WLAN_EID_QOS_TRAFFIC_CAPA,
 828                         WLAN_EID_TIM_BCAST_REQ,
 829                         WLAN_EID_INTERWORKING,
 830                         /* 60GHz doesn't happen right now */
 831                         WLAN_EID_VHT_CAPABILITY,
 832                         WLAN_EID_OPMODE_NOTIF,
 833                 };
 834
 835                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 836                                                  assoc_data->ie_len,
 837                                                  before_ht,
 838                                                  ARRAY_SIZE(before_ht),
 839                                                  after_ric,
 840                                                  ARRAY_SIZE(after_ric),
 841                                                  offset);
 842                 pos = skb_put(skb, noffset - offset);
 843                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 844                 offset = noffset;
 845         }
 846
 847         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 848                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 849                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 850
 851         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 852                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 853                                     sband, chan, sdata->smps_mode);
 854
 855         /* if present, add any custom IEs that go before VHT */
 856         if (assoc_data->ie_len) {
 857                 static const u8 before_vht[] = {
 858                         WLAN_EID_SSID,
 859                         WLAN_EID_SUPP_RATES,
 860                         WLAN_EID_EXT_SUPP_RATES,
 861                         WLAN_EID_PWR_CAPABILITY,
 862                         WLAN_EID_SUPPORTED_CHANNELS,
 863                         WLAN_EID_RSN,
 864                         WLAN_EID_QOS_CAPA,
 865                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 866                         WLAN_EID_MOBILITY_DOMAIN,
 867                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 868                         WLAN_EID_HT_CAPABILITY,
 869                         WLAN_EID_BSS_COEX_2040,
 870                         WLAN_EID_EXT_CAPABILITY,
 871                         WLAN_EID_QOS_TRAFFIC_CAPA,
 872                         WLAN_EID_TIM_BCAST_REQ,
 873                         WLAN_EID_INTERWORKING,
 874                 };
 875
 876                 /* RIC already taken above, so no need to handle here anymore */
 877                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 878                                              before_vht, ARRAY_SIZE(before_vht),
 879                                              offset);
 880                 pos = skb_put(skb, noffset - offset);
 881                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 882                 offset = noffset;
 883         }
 884
 885         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 886                 ieee80211_add_vht_ie(sdata, skb, sband,
 887                                      &assoc_data->ap_vht_cap);
 888
 889         /* if present, add any custom non-vendor IEs that go after HT */
 890         if (assoc_data->ie_len) {
 891                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 892                                                     assoc_data->ie_len,
 893                                                     offset);
 894                 pos = skb_put(skb, noffset - offset);
 895                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 896                 offset = noffset;
 897         }
 898
 899         if (assoc_data->wmm) {
 900                 if (assoc_data->uapsd) {
 901                         qos_info = ifmgd->uapsd_queues;
 902                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 903                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 904                 } else {
 905                         qos_info = 0;
 906                 }
 907
 908                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 909         }
 910
 911         /* add any remaining custom (i.e. vendor specific here) IEs */
 912         if (assoc_data->ie_len) {
 913                 noffset = assoc_data->ie_len;
 914                 pos = skb_put(skb, noffset - offset);
 915                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 916         }
 917
 918         drv_mgd_prepare_tx(local, sdata);
 919
 920         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 921         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 922                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 923                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 924         ieee80211_tx_skb(sdata, skb);
 925 }
 926
 927 void ieee80211_send_pspoll(struct ieee80211_local *local,
 928                            struct ieee80211_sub_if_data *sdata)
 929 {
 930         struct ieee80211_pspoll *pspoll;
 931         struct sk_buff *skb;
 932
 933         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 934         if (!skb)
 935                 return;
 936
 937         pspoll = (struct ieee80211_pspoll *) skb->data;
 938         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 939
 940         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 941         ieee80211_tx_skb(sdata, skb);
 942 }
 943
 944 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 945                              struct ieee80211_sub_if_data *sdata,
 946                              int powersave)
 947 {
 948         struct sk_buff *skb;
 949         struct ieee80211_hdr_3addr *nullfunc;
 950         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 951
 952         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 953         if (!skb)
 954                 return;
 955
 956         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 957         if (powersave)
 958                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 959
 960         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 961                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 962
 963         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 964                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 965
 966         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 967                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 968
 969         ieee80211_tx_skb(sdata, skb);
 970 }
 971
 972 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 973                                           struct ieee80211_sub_if_data *sdata)
 974 {
 975         struct sk_buff *skb;
 976         struct ieee80211_hdr *nullfunc;
 977         __le16 fc;
 978
 979         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 980                 return;
 981
 982         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 983         if (!skb)
 984                 return;
 985
 986         skb_reserve(skb, local->hw.extra_tx_headroom);
 987
 988         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 989         memset(nullfunc, 0, 30);
 990         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 991                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 992         nullfunc->frame_control = fc;
 993         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 994         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 995         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 996         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 997
 998         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 999         ieee80211_tx_skb(sdata, skb);
1000 }
1001
1002 /* spectrum management related things */
1003 static void ieee80211_chswitch_work(struct work_struct *work)
1004 {
1005         struct ieee80211_sub_if_data *sdata =
1006                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
1007         struct ieee80211_local *local = sdata->local;
1008         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1009         int ret;
1010
1011         if (!ieee80211_sdata_running(sdata))
1012                 return;
1013
1014         sdata_lock(sdata);
1015         mutex_lock(&local->mtx);
1016         mutex_lock(&local->chanctx_mtx);
1017
1018         if (!ifmgd->associated)
1019                 goto out;
1020
1021         if (!sdata->vif.csa_active)
1022                 goto out;
1023
1024         /*
1025          * using reservation isn't immediate as it may be deferred until later
1026          * with multi-vif. once reservation is complete it will re-schedule the
1027          * work with no reserved_chanctx so verify chandef to check if it
1028          * completed successfully
1029          */
1030
1031         if (sdata->reserved_chanctx) {
1032                 /*
1033                  * with multi-vif csa driver may call ieee80211_csa_finish()
1034                  * many times while waiting for other interfaces to use their
1035                  * reservations
1036                  */
1037                 if (sdata->reserved_ready)
1038                         goto out;
1039
1040                 ret = ieee80211_vif_use_reserved_context(sdata);
1041                 if (ret) {
1042                         sdata_info(sdata,
1043                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1044                                    ret);
1045                         ieee80211_queue_work(&sdata->local->hw,
1046                                              &ifmgd->csa_connection_drop_work);
1047                         goto out;
1048                 }
1049
1050                 goto out;
1051         }
1052
1053         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1054                                         &sdata->csa_chandef)) {
1055                 sdata_info(sdata,
1056                            "failed to finalize channel switch, disconnecting\n");
1057                 ieee80211_queue_work(&sdata->local->hw,
1058                                      &ifmgd->csa_connection_drop_work);
1059                 goto out;
1060         }
1061
1062         /* XXX: shouldn't really modify cfg80211-owned data! */
1063         ifmgd->associated->channel = sdata->csa_chandef.chan;
1064
1065         ifmgd->csa_waiting_bcn = true;
1066
1067         ieee80211_sta_reset_beacon_monitor(sdata);
1068         ieee80211_sta_reset_conn_monitor(sdata);
1069
1070 out:
1071         mutex_unlock(&local->chanctx_mtx);
1072         mutex_unlock(&local->mtx);
1073         sdata_unlock(sdata);
1074 }
1075
1076 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1077 {
1078         struct ieee80211_local *local = sdata->local;
1079         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1080         int ret;
1081
1082         sdata_assert_lock(sdata);
1083
1084         WARN_ON(!sdata->vif.csa_active);
1085
1086         if (sdata->csa_block_tx) {
1087                 ieee80211_wake_vif_queues(local, sdata,
1088                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1089                 sdata->csa_block_tx = false;
1090         }
1091
1092         sdata->vif.csa_active = false;
1093         ifmgd->csa_waiting_bcn = false;
1094
1095         ret = drv_post_channel_switch(sdata);
1096         if (ret) {
1097                 sdata_info(sdata,
1098                            "driver post channel switch failed, disconnecting\n");
1099                 ieee80211_queue_work(&local->hw,
1100                                      &ifmgd->csa_connection_drop_work);
1101                 return;
1102         }
1103
1104         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1105 }
1106
1107 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1108 {
1109         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1110         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1111
1112         trace_api_chswitch_done(sdata, success);
1113         if (!success) {
1114                 sdata_info(sdata,
1115                            "driver channel switch failed, disconnecting\n");
1116                 ieee80211_queue_work(&sdata->local->hw,
1117                                      &ifmgd->csa_connection_drop_work);
1118         } else {
1119                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1120         }
1121 }
1122 EXPORT_SYMBOL(ieee80211_chswitch_done);
1123
1124 static void ieee80211_chswitch_timer(unsigned long data)
1125 {
1126         struct ieee80211_sub_if_data *sdata =
1127                 (struct ieee80211_sub_if_data *) data;
1128
1129         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1130 }
1131
1132 static void
1133 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1134                                  u64 timestamp, u32 device_timestamp,
1135                                  struct ieee802_11_elems *elems,
1136                                  bool beacon)
1137 {
1138         struct ieee80211_local *local = sdata->local;
1139         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1140         struct cfg80211_bss *cbss = ifmgd->associated;
1141         struct ieee80211_chanctx_conf *conf;
1142         struct ieee80211_chanctx *chanctx;
1143         enum ieee80211_band current_band;
1144         struct ieee80211_csa_ie csa_ie;
1145         struct ieee80211_channel_switch ch_switch;
1146         int res;
1147
1148         sdata_assert_lock(sdata);
1149
1150         if (!cbss)
1151                 return;
1152
1153         if (local->scanning)
1154                 return;
1155
1156         /* disregard subsequent announcements if we are already processing */
1157         if (sdata->vif.csa_active)
1158                 return;
1159
1160         current_band = cbss->channel->band;
1161         memset(&csa_ie, 0, sizeof(csa_ie));
1162         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1163                                            ifmgd->flags,
1164                                            ifmgd->associated->bssid, &csa_ie);
1165         if (res < 0)
1166                 ieee80211_queue_work(&local->hw,
1167                                      &ifmgd->csa_connection_drop_work);
1168         if (res)
1169                 return;
1170
1171         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1172                                      IEEE80211_CHAN_DISABLED)) {
1173                 sdata_info(sdata,
1174                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1175                            ifmgd->associated->bssid,
1176                            csa_ie.chandef.chan->center_freq,
1177                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1178                            csa_ie.chandef.center_freq2);
1179                 ieee80211_queue_work(&local->hw,
1180                                      &ifmgd->csa_connection_drop_work);
1181                 return;
1182         }
1183
1184         if (cfg80211_chandef_identical(&csa_ie.chandef,
1185                                        &sdata->vif.bss_conf.chandef)) {
1186                 if (ifmgd->csa_ignored_same_chan)
1187                         return;
1188                 sdata_info(sdata,
1189                            "AP %pM tries to chanswitch to same channel, ignore\n",
1190                            ifmgd->associated->bssid);
1191                 ifmgd->csa_ignored_same_chan = true;
1192                 return;
1193         }
1194
1195         /*
1196          * Drop all TDLS peers - either we disconnect or move to a different
1197          * channel from this point on. There's no telling what our peer will do.
1198          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1199          * have an incompatible wider chandef.
1200          */
1201         ieee80211_teardown_tdls_peers(sdata);
1202
1203         mutex_lock(&local->mtx);
1204         mutex_lock(&local->chanctx_mtx);
1205         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1206                                          lockdep_is_held(&local->chanctx_mtx));
1207         if (!conf) {
1208                 sdata_info(sdata,
1209                            "no channel context assigned to vif?, disconnecting\n");
1210                 goto drop_connection;
1211         }
1212
1213         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1214
1215         if (local->use_chanctx &&
1216             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1217                 sdata_info(sdata,
1218                            "driver doesn't support chan-switch with channel contexts\n");
1219                 goto drop_connection;
1220         }
1221
1222         ch_switch.timestamp = timestamp;
1223         ch_switch.device_timestamp = device_timestamp;
1224         ch_switch.block_tx = csa_ie.mode;
1225         ch_switch.chandef = csa_ie.chandef;
1226         ch_switch.count = csa_ie.count;
1227
1228         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1229                 sdata_info(sdata,
1230                            "preparing for channel switch failed, disconnecting\n");
1231                 goto drop_connection;
1232         }
1233
1234         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1235                                             chanctx->mode, false);
1236         if (res) {
1237                 sdata_info(sdata,
1238                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1239                            res);
1240                 goto drop_connection;
1241         }
1242         mutex_unlock(&local->chanctx_mtx);
1243
1244         sdata->vif.csa_active = true;
1245         sdata->csa_chandef = csa_ie.chandef;
1246         sdata->csa_block_tx = csa_ie.mode;
1247         ifmgd->csa_ignored_same_chan = false;
1248
1249         if (sdata->csa_block_tx)
1250                 ieee80211_stop_vif_queues(local, sdata,
1251                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1252         mutex_unlock(&local->mtx);
1253
1254         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1255                                           csa_ie.count);
1256
1257         if (local->ops->channel_switch) {
1258                 /* use driver's channel switch callback */
1259                 drv_channel_switch(local, sdata, &ch_switch);
1260                 return;
1261         }
1262
1263         /* channel switch handled in software */
1264         if (csa_ie.count <= 1)
1265                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1266         else
1267                 mod_timer(&ifmgd->chswitch_timer,
1268                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1269                                          cbss->beacon_interval));
1270         return;
1271  drop_connection:
1272         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1273         mutex_unlock(&local->chanctx_mtx);
1274         mutex_unlock(&local->mtx);
1275 }
1276
1277 static bool
1278 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1279                                  struct ieee80211_channel *channel,
1280                                  const u8 *country_ie, u8 country_ie_len,
1281                                  const u8 *pwr_constr_elem,
1282                                  int *chan_pwr, int *pwr_reduction)
1283 {
1284         struct ieee80211_country_ie_triplet *triplet;
1285         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1286         int i, chan_increment;
1287         bool have_chan_pwr = false;
1288
1289         /* Invalid IE */
1290         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1291                 return false;
1292
1293         triplet = (void *)(country_ie + 3);
1294         country_ie_len -= 3;
1295
1296         switch (channel->band) {
1297         default:
1298                 WARN_ON_ONCE(1);
1299                 /* fall through */
1300         case IEEE80211_BAND_2GHZ:
1301         case IEEE80211_BAND_60GHZ:
1302                 chan_increment = 1;
1303                 break;
1304         case IEEE80211_BAND_5GHZ:
1305                 chan_increment = 4;
1306                 break;
1307         }
1308
1309         /* find channel */
1310         while (country_ie_len >= 3) {
1311                 u8 first_channel = triplet->chans.first_channel;
1312
1313                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1314                         goto next;
1315
1316                 for (i = 0; i < triplet->chans.num_channels; i++) {
1317                         if (first_channel + i * chan_increment == chan) {
1318                                 have_chan_pwr = true;
1319                                 *chan_pwr = triplet->chans.max_power;
1320                                 break;
1321                         }
1322                 }
1323                 if (have_chan_pwr)
1324                         break;
1325
1326  next:
1327                 triplet++;
1328                 country_ie_len -= 3;
1329         }
1330
1331         if (have_chan_pwr && pwr_constr_elem)
1332                 *pwr_reduction = *pwr_constr_elem;
1333         else
1334                 *pwr_reduction = 0;
1335
1336         return have_chan_pwr;
1337 }
1338
1339 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1340                                       struct ieee80211_channel *channel,
1341                                       const u8 *cisco_dtpc_ie,
1342                                       int *pwr_level)
1343 {
1344         /* From practical testing, the first data byte of the DTPC element
1345          * seems to contain the requested dBm level, and the CLI on Cisco
1346          * APs clearly state the range is -127 to 127 dBm, which indicates
1347          * a signed byte, although it seemingly never actually goes negative.
1348          * The other byte seems to always be zero.
1349          */
1350         *pwr_level = (__s8)cisco_dtpc_ie[4];
1351 }
1352
1353 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1354                                        struct ieee80211_channel *channel,
1355                                        struct ieee80211_mgmt *mgmt,
1356                                        const u8 *country_ie, u8 country_ie_len,
1357                                        const u8 *pwr_constr_ie,
1358                                        const u8 *cisco_dtpc_ie)
1359 {
1360         bool has_80211h_pwr = false, has_cisco_pwr = false;
1361         int chan_pwr = 0, pwr_reduction_80211h = 0;
1362         int pwr_level_cisco, pwr_level_80211h;
1363         int new_ap_level;
1364         __le16 capab = mgmt->u.probe_resp.capab_info;
1365
1366         if (country_ie &&
1367             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1368              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1369                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1370                         sdata, channel, country_ie, country_ie_len,
1371                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1372                 pwr_level_80211h =
1373                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1374         }
1375
1376         if (cisco_dtpc_ie) {
1377                 ieee80211_find_cisco_dtpc(
1378                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1379                 has_cisco_pwr = true;
1380         }
1381
1382         if (!has_80211h_pwr && !has_cisco_pwr)
1383                 return 0;
1384
1385         /* If we have both 802.11h and Cisco DTPC, apply both limits
1386          * by picking the smallest of the two power levels advertised.
1387          */
1388         if (has_80211h_pwr &&
1389             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1390                 sdata_dbg(sdata,
1391                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1392                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1393                           sdata->u.mgd.bssid);
1394                 new_ap_level = pwr_level_80211h;
1395         } else {  /* has_cisco_pwr is always true here. */
1396                 sdata_dbg(sdata,
1397                           "Limiting TX power to %d dBm as advertised by %pM\n",
1398                           pwr_level_cisco, sdata->u.mgd.bssid);
1399                 new_ap_level = pwr_level_cisco;
1400         }
1401
1402         if (sdata->ap_power_level == new_ap_level)
1403                 return 0;
1404
1405         sdata->ap_power_level = new_ap_level;
1406         if (__ieee80211_recalc_txpower(sdata))
1407                 return BSS_CHANGED_TXPOWER;
1408         return 0;
1409 }
1410
1411 /* powersave */
1412 static void ieee80211_enable_ps(struct ieee80211_local *local,
1413                                 struct ieee80211_sub_if_data *sdata)
1414 {
1415         struct ieee80211_conf *conf = &local->hw.conf;
1416
1417         /*
1418          * If we are scanning right now then the parameters will
1419          * take effect when scan finishes.
1420          */
1421         if (local->scanning)
1422                 return;
1423
1424         if (conf->dynamic_ps_timeout > 0 &&
1425             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1426                 mod_timer(&local->dynamic_ps_timer, jiffies +
1427                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1428         } else {
1429                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1430                         ieee80211_send_nullfunc(local, sdata, 1);
1431
1432                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1433                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1434                         return;
1435
1436                 conf->flags |= IEEE80211_CONF_PS;
1437                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1438         }
1439 }
1440
1441 static void ieee80211_change_ps(struct ieee80211_local *local)
1442 {
1443         struct ieee80211_conf *conf = &local->hw.conf;
1444
1445         if (local->ps_sdata) {
1446                 ieee80211_enable_ps(local, local->ps_sdata);
1447         } else if (conf->flags & IEEE80211_CONF_PS) {
1448                 conf->flags &= ~IEEE80211_CONF_PS;
1449                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1450                 del_timer_sync(&local->dynamic_ps_timer);
1451                 cancel_work_sync(&local->dynamic_ps_enable_work);
1452         }
1453 }
1454
1455 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1456 {
1457         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1458         struct sta_info *sta = NULL;
1459         bool authorized = false;
1460
1461         if (!mgd->powersave)
1462                 return false;
1463
1464         if (mgd->broken_ap)
1465                 return false;
1466
1467         if (!mgd->associated)
1468                 return false;
1469
1470         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1471                 return false;
1472
1473         if (!mgd->have_beacon)
1474                 return false;
1475
1476         rcu_read_lock();
1477         sta = sta_info_get(sdata, mgd->bssid);
1478         if (sta)
1479                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1480         rcu_read_unlock();
1481
1482         return authorized;
1483 }
1484
1485 /* need to hold RTNL or interface lock */
1486 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1487 {
1488         struct ieee80211_sub_if_data *sdata, *found = NULL;
1489         int count = 0;
1490         int timeout;
1491
1492         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1493                 local->ps_sdata = NULL;
1494                 return;
1495         }
1496
1497         list_for_each_entry(sdata, &local->interfaces, list) {
1498                 if (!ieee80211_sdata_running(sdata))
1499                         continue;
1500                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1501                         /* If an AP vif is found, then disable PS
1502                          * by setting the count to zero thereby setting
1503                          * ps_sdata to NULL.
1504                          */
1505                         count = 0;
1506                         break;
1507                 }
1508                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1509                         continue;
1510                 found = sdata;
1511                 count++;
1512         }
1513
1514         if (count == 1 && ieee80211_powersave_allowed(found)) {
1515                 s32 beaconint_us;
1516
1517                 if (latency < 0)
1518                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1519
1520                 beaconint_us = ieee80211_tu_to_usec(
1521                                         found->vif.bss_conf.beacon_int);
1522
1523                 timeout = local->dynamic_ps_forced_timeout;
1524                 if (timeout < 0) {
1525                         /*
1526                          * Go to full PSM if the user configures a very low
1527                          * latency requirement.
1528                          * The 2000 second value is there for compatibility
1529                          * until the PM_QOS_NETWORK_LATENCY is configured
1530                          * with real values.
1531                          */
1532                         if (latency > (1900 * USEC_PER_MSEC) &&
1533                             latency != (2000 * USEC_PER_SEC))
1534                                 timeout = 0;
1535                         else
1536                                 timeout = 100;
1537                 }
1538                 local->hw.conf.dynamic_ps_timeout = timeout;
1539
1540                 if (beaconint_us > latency) {
1541                         local->ps_sdata = NULL;
1542                 } else {
1543                         int maxslp = 1;
1544                         u8 dtimper = found->u.mgd.dtim_period;
1545
1546                         /* If the TIM IE is invalid, pretend the value is 1 */
1547                         if (!dtimper)
1548                                 dtimper = 1;
1549                         else if (dtimper > 1)
1550                                 maxslp = min_t(int, dtimper,
1551                                                     latency / beaconint_us);
1552
1553                         local->hw.conf.max_sleep_period = maxslp;
1554                         local->hw.conf.ps_dtim_period = dtimper;
1555                         local->ps_sdata = found;
1556                 }
1557         } else {
1558                 local->ps_sdata = NULL;
1559         }
1560
1561         ieee80211_change_ps(local);
1562 }
1563
1564 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1565 {
1566         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1567
1568         if (sdata->vif.bss_conf.ps != ps_allowed) {
1569                 sdata->vif.bss_conf.ps = ps_allowed;
1570                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1571         }
1572 }
1573
1574 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1575 {
1576         struct ieee80211_local *local =
1577                 container_of(work, struct ieee80211_local,
1578                              dynamic_ps_disable_work);
1579
1580         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1581                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1582                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1583         }
1584
1585         ieee80211_wake_queues_by_reason(&local->hw,
1586                                         IEEE80211_MAX_QUEUE_MAP,
1587                                         IEEE80211_QUEUE_STOP_REASON_PS,
1588                                         false);
1589 }
1590
1591 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1592 {
1593         struct ieee80211_local *local =
1594                 container_of(work, struct ieee80211_local,
1595                              dynamic_ps_enable_work);
1596         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1597         struct ieee80211_if_managed *ifmgd;
1598         unsigned long flags;
1599         int q;
1600
1601         /* can only happen when PS was just disabled anyway */
1602         if (!sdata)
1603                 return;
1604
1605         ifmgd = &sdata->u.mgd;
1606
1607         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1608                 return;
1609
1610         if (local->hw.conf.dynamic_ps_timeout > 0) {
1611                 /* don't enter PS if TX frames are pending */
1612                 if (drv_tx_frames_pending(local)) {
1613                         mod_timer(&local->dynamic_ps_timer, jiffies +
1614                                   msecs_to_jiffies(
1615                                   local->hw.conf.dynamic_ps_timeout));
1616                         return;
1617                 }
1618
1619                 /*
1620                  * transmission can be stopped by others which leads to
1621                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1622                  * is not the actual idle state.
1623                  */
1624                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1625                 for (q = 0; q < local->hw.queues; q++) {
1626                         if (local->queue_stop_reasons[q]) {
1627                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1628                                                        flags);
1629                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1630                                           msecs_to_jiffies(
1631                                           local->hw.conf.dynamic_ps_timeout));
1632                                 return;
1633                         }
1634                 }
1635                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1636         }
1637
1638         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1639             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1640                 if (drv_tx_frames_pending(local)) {
1641                         mod_timer(&local->dynamic_ps_timer, jiffies +
1642                                   msecs_to_jiffies(
1643                                   local->hw.conf.dynamic_ps_timeout));
1644                 } else {
1645                         ieee80211_send_nullfunc(local, sdata, 1);
1646                         /* Flush to get the tx status of nullfunc frame */
1647                         ieee80211_flush_queues(local, sdata, false);
1648                 }
1649         }
1650
1651         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1652               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1653             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1654                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1655                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1656                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1657         }
1658 }
1659
1660 void ieee80211_dynamic_ps_timer(unsigned long data)
1661 {
1662         struct ieee80211_local *local = (void *) data;
1663
1664         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1665 }
1666
1667 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1668 {
1669         struct delayed_work *delayed_work =
1670                 container_of(work, struct delayed_work, work);
1671         struct ieee80211_sub_if_data *sdata =
1672                 container_of(delayed_work, struct ieee80211_sub_if_data,
1673                              dfs_cac_timer_work);
1674         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1675
1676         mutex_lock(&sdata->local->mtx);
1677         if (sdata->wdev.cac_started) {
1678                 ieee80211_vif_release_channel(sdata);
1679                 cfg80211_cac_event(sdata->dev, &chandef,
1680                                    NL80211_RADAR_CAC_FINISHED,
1681                                    GFP_KERNEL);
1682         }
1683         mutex_unlock(&sdata->local->mtx);
1684 }
1685
1686 static bool
1687 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1688 {
1689         struct ieee80211_local *local = sdata->local;
1690         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1691         bool ret = false;
1692         int ac;
1693
1694         if (local->hw.queues < IEEE80211_NUM_ACS)
1695                 return false;
1696
1697         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1698                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1699                 int non_acm_ac;
1700                 unsigned long now = jiffies;
1701
1702                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1703                     tx_tspec->admitted_time &&
1704                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1705                         tx_tspec->consumed_tx_time = 0;
1706                         tx_tspec->time_slice_start = now;
1707
1708                         if (tx_tspec->downgraded)
1709                                 tx_tspec->action =
1710                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1711                 }
1712
1713                 switch (tx_tspec->action) {
1714                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1715                         /* take the original parameters */
1716                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1717                                 sdata_err(sdata,
1718                                           "failed to set TX queue parameters for queue %d\n",
1719                                           ac);
1720                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1721                         tx_tspec->downgraded = false;
1722                         ret = true;
1723                         break;
1724                 case TX_TSPEC_ACTION_DOWNGRADE:
1725                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1726                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1727                                 ret = true;
1728                                 break;
1729                         }
1730                         /* downgrade next lower non-ACM AC */
1731                         for (non_acm_ac = ac + 1;
1732                              non_acm_ac < IEEE80211_NUM_ACS;
1733                              non_acm_ac++)
1734                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1735                                         break;
1736                         /* The loop will result in using BK even if it requires
1737                          * admission control, such configuration makes no sense
1738                          * and we have to transmit somehow - the AC selection
1739                          * does the same thing.
1740                          */
1741                         if (drv_conf_tx(local, sdata, ac,
1742                                         &sdata->tx_conf[non_acm_ac]))
1743                                 sdata_err(sdata,
1744                                           "failed to set TX queue parameters for queue %d\n",
1745                                           ac);
1746                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1747                         ret = true;
1748                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1749                                 tx_tspec->time_slice_start + HZ - now + 1);
1750                         break;
1751                 case TX_TSPEC_ACTION_NONE:
1752                         /* nothing now */
1753                         break;
1754                 }
1755         }
1756
1757         return ret;
1758 }
1759
1760 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1761 {
1762         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1763                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1764 }
1765
1766 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1767 {
1768         struct ieee80211_sub_if_data *sdata;
1769
1770         sdata = container_of(work, struct ieee80211_sub_if_data,
1771                              u.mgd.tx_tspec_wk.work);
1772         ieee80211_sta_handle_tspec_ac_params(sdata);
1773 }
1774
1775 /* MLME */
1776 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1777                                      struct ieee80211_sub_if_data *sdata,
1778                                      const u8 *wmm_param, size_t wmm_param_len)
1779 {
1780         struct ieee80211_tx_queue_params params;
1781         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1782         size_t left;
1783         int count;
1784         const u8 *pos;
1785         u8 uapsd_queues = 0;
1786
1787         if (!local->ops->conf_tx)
1788                 return false;
1789
1790         if (local->hw.queues < IEEE80211_NUM_ACS)
1791                 return false;
1792
1793         if (!wmm_param)
1794                 return false;
1795
1796         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1797                 return false;
1798
1799         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1800                 uapsd_queues = ifmgd->uapsd_queues;
1801
1802         count = wmm_param[6] & 0x0f;
1803         if (count == ifmgd->wmm_last_param_set)
1804                 return false;
1805         ifmgd->wmm_last_param_set = count;
1806
1807         pos = wmm_param + 8;
1808         left = wmm_param_len - 8;
1809
1810         memset(&params, 0, sizeof(params));
1811
1812         sdata->wmm_acm = 0;
1813         for (; left >= 4; left -= 4, pos += 4) {
1814                 int aci = (pos[0] >> 5) & 0x03;
1815                 int acm = (pos[0] >> 4) & 0x01;
1816                 bool uapsd = false;
1817                 int queue;
1818
1819                 switch (aci) {
1820                 case 1: /* AC_BK */
1821                         queue = 3;
1822                         if (acm)
1823                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1824                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1825                                 uapsd = true;
1826                         break;
1827                 case 2: /* AC_VI */
1828                         queue = 1;
1829                         if (acm)
1830                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1831                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1832                                 uapsd = true;
1833                         break;
1834                 case 3: /* AC_VO */
1835                         queue = 0;
1836                         if (acm)
1837                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1838                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1839                                 uapsd = true;
1840                         break;
1841                 case 0: /* AC_BE */
1842                 default:
1843                         queue = 2;
1844                         if (acm)
1845                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1846                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1847                                 uapsd = true;
1848                         break;
1849                 }
1850
1851                 params.aifs = pos[0] & 0x0f;
1852                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1853                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1854                 params.txop = get_unaligned_le16(pos + 2);
1855                 params.acm = acm;
1856                 params.uapsd = uapsd;
1857
1858                 mlme_dbg(sdata,
1859                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1860                          queue, aci, acm,
1861                          params.aifs, params.cw_min, params.cw_max,
1862                          params.txop, params.uapsd,
1863                          ifmgd->tx_tspec[queue].downgraded);
1864                 sdata->tx_conf[queue] = params;
1865                 if (!ifmgd->tx_tspec[queue].downgraded &&
1866                     drv_conf_tx(local, sdata, queue, &params))
1867                         sdata_err(sdata,
1868                                   "failed to set TX queue parameters for queue %d\n",
1869                                   queue);
1870         }
1871
1872         /* enable WMM or activate new settings */
1873         sdata->vif.bss_conf.qos = true;
1874         return true;
1875 }
1876
1877 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1878 {
1879         lockdep_assert_held(&sdata->local->mtx);
1880
1881         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1882         ieee80211_run_deferred_scan(sdata->local);
1883 }
1884
1885 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1886 {
1887         mutex_lock(&sdata->local->mtx);
1888         __ieee80211_stop_poll(sdata);
1889         mutex_unlock(&sdata->local->mtx);
1890 }
1891
1892 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1893                                            u16 capab, bool erp_valid, u8 erp)
1894 {
1895         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1896         u32 changed = 0;
1897         bool use_protection;
1898         bool use_short_preamble;
1899         bool use_short_slot;
1900
1901         if (erp_valid) {
1902                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1903                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1904         } else {
1905                 use_protection = false;
1906                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1907         }
1908
1909         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1910         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1911                 use_short_slot = true;
1912
1913         if (use_protection != bss_conf->use_cts_prot) {
1914                 bss_conf->use_cts_prot = use_protection;
1915                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1916         }
1917
1918         if (use_short_preamble != bss_conf->use_short_preamble) {
1919                 bss_conf->use_short_preamble = use_short_preamble;
1920                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1921         }
1922
1923         if (use_short_slot != bss_conf->use_short_slot) {
1924                 bss_conf->use_short_slot = use_short_slot;
1925                 changed |= BSS_CHANGED_ERP_SLOT;
1926         }
1927
1928         return changed;
1929 }
1930
1931 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1932                                      struct cfg80211_bss *cbss,
1933                                      u32 bss_info_changed)
1934 {
1935         struct ieee80211_bss *bss = (void *)cbss->priv;
1936         struct ieee80211_local *local = sdata->local;
1937         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1938
1939         bss_info_changed |= BSS_CHANGED_ASSOC;
1940         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1941                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1942
1943         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1944                 beacon_loss_count * bss_conf->beacon_int));
1945
1946         sdata->u.mgd.associated = cbss;
1947         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1948
1949         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1950
1951         if (sdata->vif.p2p) {
1952                 const struct cfg80211_bss_ies *ies;
1953
1954                 rcu_read_lock();
1955                 ies = rcu_dereference(cbss->ies);
1956                 if (ies) {
1957                         int ret;
1958
1959                         ret = cfg80211_get_p2p_attr(
1960                                         ies->data, ies->len,
1961                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1962                                         (u8 *) &bss_conf->p2p_noa_attr,
1963                                         sizeof(bss_conf->p2p_noa_attr));
1964                         if (ret >= 2) {
1965                                 sdata->u.mgd.p2p_noa_index =
1966                                         bss_conf->p2p_noa_attr.index;
1967                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1968                         }
1969                 }
1970                 rcu_read_unlock();
1971         }
1972
1973         /* just to be sure */
1974         ieee80211_stop_poll(sdata);
1975
1976         ieee80211_led_assoc(local, 1);
1977
1978         if (sdata->u.mgd.have_beacon) {
1979                 /*
1980                  * If the AP is buggy we may get here with no DTIM period
1981                  * known, so assume it's 1 which is the only safe assumption
1982                  * in that case, although if the TIM IE is broken powersave
1983                  * probably just won't work at all.
1984                  */
1985                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1986                 bss_conf->beacon_rate = bss->beacon_rate;
1987                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1988         } else {
1989                 bss_conf->beacon_rate = NULL;
1990                 bss_conf->dtim_period = 0;
1991         }
1992
1993         bss_conf->assoc = 1;
1994
1995         /* Tell the driver to monitor connection quality (if supported) */
1996         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1997             bss_conf->cqm_rssi_thold)
1998                 bss_info_changed |= BSS_CHANGED_CQM;
1999
2000         /* Enable ARP filtering */
2001         if (bss_conf->arp_addr_cnt)
2002                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
2003
2004         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
2005
2006         mutex_lock(&local->iflist_mtx);
2007         ieee80211_recalc_ps(local, -1);
2008         mutex_unlock(&local->iflist_mtx);
2009
2010         ieee80211_recalc_smps(sdata);
2011         ieee80211_recalc_ps_vif(sdata);
2012
2013         netif_carrier_on(sdata->dev);
2014 }
2015
2016 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2017                                    u16 stype, u16 reason, bool tx,
2018                                    u8 *frame_buf)
2019 {
2020         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2021         struct ieee80211_local *local = sdata->local;
2022         u32 changed = 0;
2023
2024         sdata_assert_lock(sdata);
2025
2026         if (WARN_ON_ONCE(tx && !frame_buf))
2027                 return;
2028
2029         if (WARN_ON(!ifmgd->associated))
2030                 return;
2031
2032         ieee80211_stop_poll(sdata);
2033
2034         ifmgd->associated = NULL;
2035         netif_carrier_off(sdata->dev);
2036
2037         /*
2038          * if we want to get out of ps before disassoc (why?) we have
2039          * to do it before sending disassoc, as otherwise the null-packet
2040          * won't be valid.
2041          */
2042         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2043                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2044                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2045         }
2046         local->ps_sdata = NULL;
2047
2048         /* disable per-vif ps */
2049         ieee80211_recalc_ps_vif(sdata);
2050
2051         /* make sure ongoing transmission finishes */
2052         synchronize_net();
2053
2054         /*
2055          * drop any frame before deauth/disassoc, this can be data or
2056          * management frame. Since we are disconnecting, we should not
2057          * insist sending these frames which can take time and delay
2058          * the disconnection and possible the roaming.
2059          */
2060         if (tx)
2061                 ieee80211_flush_queues(local, sdata, true);
2062
2063         /* deauthenticate/disassociate now */
2064         if (tx || frame_buf)
2065                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2066                                                reason, tx, frame_buf);
2067
2068         /* flush out frame - make sure the deauth was actually sent */
2069         if (tx)
2070                 ieee80211_flush_queues(local, sdata, false);
2071
2072         /* clear bssid only after building the needed mgmt frames */
2073         eth_zero_addr(ifmgd->bssid);
2074
2075         /* remove AP and TDLS peers */
2076         sta_info_flush(sdata);
2077
2078         /* finally reset all BSS / config parameters */
2079         changed |= ieee80211_reset_erp_info(sdata);
2080
2081         ieee80211_led_assoc(local, 0);
2082         changed |= BSS_CHANGED_ASSOC;
2083         sdata->vif.bss_conf.assoc = false;
2084
2085         ifmgd->p2p_noa_index = -1;
2086         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2087                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2088
2089         /* on the next assoc, re-program HT/VHT parameters */
2090         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2091         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2092         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2093         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2094         sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2095
2096         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2097
2098         del_timer_sync(&local->dynamic_ps_timer);
2099         cancel_work_sync(&local->dynamic_ps_enable_work);
2100
2101         /* Disable ARP filtering */
2102         if (sdata->vif.bss_conf.arp_addr_cnt)
2103                 changed |= BSS_CHANGED_ARP_FILTER;
2104
2105         sdata->vif.bss_conf.qos = false;
2106         changed |= BSS_CHANGED_QOS;
2107
2108         /* The BSSID (not really interesting) and HT changed */
2109         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2110         ieee80211_bss_info_change_notify(sdata, changed);
2111
2112         /* disassociated - set to defaults now */
2113         ieee80211_set_wmm_default(sdata, false);
2114
2115         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2116         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2117         del_timer_sync(&sdata->u.mgd.timer);
2118         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2119
2120         sdata->vif.bss_conf.dtim_period = 0;
2121         sdata->vif.bss_conf.beacon_rate = NULL;
2122
2123         ifmgd->have_beacon = false;
2124
2125         ifmgd->flags = 0;
2126         mutex_lock(&local->mtx);
2127         ieee80211_vif_release_channel(sdata);
2128
2129         sdata->vif.csa_active = false;
2130         ifmgd->csa_waiting_bcn = false;
2131         ifmgd->csa_ignored_same_chan = false;
2132         if (sdata->csa_block_tx) {
2133                 ieee80211_wake_vif_queues(local, sdata,
2134                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2135                 sdata->csa_block_tx = false;
2136         }
2137         mutex_unlock(&local->mtx);
2138
2139         /* existing TX TSPEC sessions no longer exist */
2140         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2141         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2142
2143         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2144 }
2145
2146 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2147                              struct ieee80211_hdr *hdr)
2148 {
2149         /*
2150          * We can postpone the mgd.timer whenever receiving unicast frames
2151          * from AP because we know that the connection is working both ways
2152          * at that time. But multicast frames (and hence also beacons) must
2153          * be ignored here, because we need to trigger the timer during
2154          * data idle periods for sending the periodic probe request to the
2155          * AP we're connected to.
2156          */
2157         if (is_multicast_ether_addr(hdr->addr1))
2158                 return;
2159
2160         ieee80211_sta_reset_conn_monitor(sdata);
2161 }
2162
2163 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2164 {
2165         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2166         struct ieee80211_local *local = sdata->local;
2167
2168         mutex_lock(&local->mtx);
2169         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2170                 goto out;
2171
2172         __ieee80211_stop_poll(sdata);
2173
2174         mutex_lock(&local->iflist_mtx);
2175         ieee80211_recalc_ps(local, -1);
2176         mutex_unlock(&local->iflist_mtx);
2177
2178         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2179                 goto out;
2180
2181         /*
2182          * We've received a probe response, but are not sure whether
2183          * we have or will be receiving any beacons or data, so let's
2184          * schedule the timers again, just in case.
2185          */
2186         ieee80211_sta_reset_beacon_monitor(sdata);
2187
2188         mod_timer(&ifmgd->conn_mon_timer,
2189                   round_jiffies_up(jiffies +
2190                                    IEEE80211_CONNECTION_IDLE_TIME));
2191 out:
2192         mutex_unlock(&local->mtx);
2193 }
2194
2195 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2196                                            struct ieee80211_hdr *hdr,
2197                                            u16 tx_time)
2198 {
2199         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2200         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2201         int ac = ieee80211_ac_from_tid(tid);
2202         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2203         unsigned long now = jiffies;
2204
2205         if (likely(!tx_tspec->admitted_time))
2206                 return;
2207
2208         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2209                 tx_tspec->consumed_tx_time = 0;
2210                 tx_tspec->time_slice_start = now;
2211
2212                 if (tx_tspec->downgraded) {
2213                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2214                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2215                 }
2216         }
2217
2218         if (tx_tspec->downgraded)
2219                 return;
2220
2221         tx_tspec->consumed_tx_time += tx_time;
2222
2223         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2224                 tx_tspec->downgraded = true;
2225                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2226                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2227         }
2228 }
2229
2230 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2231                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2232 {
2233         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2234
2235         if (!ieee80211_is_data(hdr->frame_control))
2236             return;
2237
2238         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2239             sdata->u.mgd.probe_send_count > 0) {
2240                 if (ack)
2241                         ieee80211_sta_reset_conn_monitor(sdata);
2242                 else
2243                         sdata->u.mgd.nullfunc_failed = true;
2244                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2245                 return;
2246         }
2247
2248         if (ack)
2249                 ieee80211_sta_reset_conn_monitor(sdata);
2250 }
2251
2252 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2253 {
2254         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2255         const u8 *ssid;
2256         u8 *dst = ifmgd->associated->bssid;
2257         u8 unicast_limit = max(1, max_probe_tries - 3);
2258
2259         /*
2260          * Try sending broadcast probe requests for the last three
2261          * probe requests after the first ones failed since some
2262          * buggy APs only support broadcast probe requests.
2263          */
2264         if (ifmgd->probe_send_count >= unicast_limit)
2265                 dst = NULL;
2266
2267         /*
2268          * When the hardware reports an accurate Tx ACK status, it's
2269          * better to send a nullfunc frame instead of a probe request,
2270          * as it will kick us off the AP quickly if we aren't associated
2271          * anymore. The timeout will be reset if the frame is ACKed by
2272          * the AP.
2273          */
2274         ifmgd->probe_send_count++;
2275
2276         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2277                 ifmgd->nullfunc_failed = false;
2278                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2279         } else {
2280                 int ssid_len;
2281
2282                 rcu_read_lock();
2283                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2284                 if (WARN_ON_ONCE(ssid == NULL))
2285                         ssid_len = 0;
2286                 else
2287                         ssid_len = ssid[1];
2288
2289                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2290                                          ssid + 2, ssid_len, NULL,
2291                                          0, (u32) -1, true, 0,
2292                                          ifmgd->associated->channel, false);
2293                 rcu_read_unlock();
2294         }
2295
2296         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2297         run_again(sdata, ifmgd->probe_timeout);
2298 }
2299
2300 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2301                                    bool beacon)
2302 {
2303         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2304         bool already = false;
2305
2306         if (!ieee80211_sdata_running(sdata))
2307                 return;
2308
2309         sdata_lock(sdata);
2310
2311         if (!ifmgd->associated)
2312                 goto out;
2313
2314         mutex_lock(&sdata->local->mtx);
2315
2316         if (sdata->local->tmp_channel || sdata->local->scanning) {
2317                 mutex_unlock(&sdata->local->mtx);
2318                 goto out;
2319         }
2320
2321         if (beacon) {
2322                 mlme_dbg_ratelimited(sdata,
2323                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2324                                      beacon_loss_count);
2325
2326                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2327         }
2328
2329         /*
2330          * The driver/our work has already reported this event or the
2331          * connection monitoring has kicked in and we have already sent
2332          * a probe request. Or maybe the AP died and the driver keeps
2333          * reporting until we disassociate...
2334          *
2335          * In either case we have to ignore the current call to this
2336          * function (except for setting the correct probe reason bit)
2337          * because otherwise we would reset the timer every time and
2338          * never check whether we received a probe response!
2339          */
2340         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2341                 already = true;
2342
2343         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2344
2345         mutex_unlock(&sdata->local->mtx);
2346
2347         if (already)
2348                 goto out;
2349
2350         mutex_lock(&sdata->local->iflist_mtx);
2351         ieee80211_recalc_ps(sdata->local, -1);
2352         mutex_unlock(&sdata->local->iflist_mtx);
2353
2354         ifmgd->probe_send_count = 0;
2355         ieee80211_mgd_probe_ap_send(sdata);
2356  out:
2357         sdata_unlock(sdata);
2358 }
2359
2360 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2361                                           struct ieee80211_vif *vif)
2362 {
2363         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2364         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2365         struct cfg80211_bss *cbss;
2366         struct sk_buff *skb;
2367         const u8 *ssid;
2368         int ssid_len;
2369
2370         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2371                 return NULL;
2372
2373         sdata_assert_lock(sdata);
2374
2375         if (ifmgd->associated)
2376                 cbss = ifmgd->associated;
2377         else if (ifmgd->auth_data)
2378                 cbss = ifmgd->auth_data->bss;
2379         else if (ifmgd->assoc_data)
2380                 cbss = ifmgd->assoc_data->bss;
2381         else
2382                 return NULL;
2383
2384         rcu_read_lock();
2385         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2386         if (WARN_ON_ONCE(ssid == NULL))
2387                 ssid_len = 0;
2388         else
2389                 ssid_len = ssid[1];
2390
2391         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2392                                         (u32) -1, cbss->channel,
2393                                         ssid + 2, ssid_len,
2394                                         NULL, 0, true);
2395         rcu_read_unlock();
2396
2397         return skb;
2398 }
2399 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2400
2401 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2402                                         const u8 *buf, size_t len, bool tx,
2403                                         u16 reason)
2404 {
2405         struct ieee80211_event event = {
2406                 .type = MLME_EVENT,
2407                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2408                 .u.mlme.reason = reason,
2409         };
2410
2411         if (tx)
2412                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2413         else
2414                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2415
2416         drv_event_callback(sdata->local, sdata, &event);
2417 }
2418
2419 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2420 {
2421         struct ieee80211_local *local = sdata->local;
2422         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2423         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2424
2425         sdata_lock(sdata);
2426         if (!ifmgd->associated) {
2427                 sdata_unlock(sdata);
2428                 return;
2429         }
2430
2431         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2432                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2433                                true, frame_buf);
2434         mutex_lock(&local->mtx);
2435         sdata->vif.csa_active = false;
2436         ifmgd->csa_waiting_bcn = false;
2437         if (sdata->csa_block_tx) {
2438                 ieee80211_wake_vif_queues(local, sdata,
2439                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2440                 sdata->csa_block_tx = false;
2441         }
2442         mutex_unlock(&local->mtx);
2443
2444         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2445                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2446
2447         sdata_unlock(sdata);
2448 }
2449
2450 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2451 {
2452         struct ieee80211_sub_if_data *sdata =
2453                 container_of(work, struct ieee80211_sub_if_data,
2454                              u.mgd.beacon_connection_loss_work);
2455         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2456         struct sta_info *sta;
2457
2458         if (ifmgd->associated) {
2459                 rcu_read_lock();
2460                 sta = sta_info_get(sdata, ifmgd->bssid);
2461                 if (sta)
2462                         sta->beacon_loss_count++;
2463                 rcu_read_unlock();
2464         }
2465
2466         if (ifmgd->connection_loss) {
2467                 sdata_info(sdata, "Connection to AP %pM lost\n",
2468                            ifmgd->bssid);
2469                 __ieee80211_disconnect(sdata);
2470         } else {
2471                 ieee80211_mgd_probe_ap(sdata, true);
2472         }
2473 }
2474
2475 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2476 {
2477         struct ieee80211_sub_if_data *sdata =
2478                 container_of(work, struct ieee80211_sub_if_data,
2479                              u.mgd.csa_connection_drop_work);
2480
2481         __ieee80211_disconnect(sdata);
2482 }
2483
2484 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2485 {
2486         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2487         struct ieee80211_hw *hw = &sdata->local->hw;
2488
2489         trace_api_beacon_loss(sdata);
2490
2491         sdata->u.mgd.connection_loss = false;
2492         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2493 }
2494 EXPORT_SYMBOL(ieee80211_beacon_loss);
2495
2496 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2497 {
2498         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2499         struct ieee80211_hw *hw = &sdata->local->hw;
2500
2501         trace_api_connection_loss(sdata);
2502
2503         sdata->u.mgd.connection_loss = true;
2504         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2505 }
2506 EXPORT_SYMBOL(ieee80211_connection_loss);
2507
2508
2509 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2510                                         bool assoc)
2511 {
2512         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2513
2514         sdata_assert_lock(sdata);
2515
2516         if (!assoc) {
2517                 /*
2518                  * we are not authenticated yet, the only timer that could be
2519                  * running is the timeout for the authentication response which
2520                  * which is not relevant anymore.
2521                  */
2522                 del_timer_sync(&sdata->u.mgd.timer);
2523                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2524
2525                 eth_zero_addr(sdata->u.mgd.bssid);
2526                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2527                 sdata->u.mgd.flags = 0;
2528                 mutex_lock(&sdata->local->mtx);
2529                 ieee80211_vif_release_channel(sdata);
2530                 mutex_unlock(&sdata->local->mtx);
2531         }
2532
2533         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2534         kfree(auth_data);
2535         sdata->u.mgd.auth_data = NULL;
2536 }
2537
2538 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2539                                          bool assoc)
2540 {
2541         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2542
2543         sdata_assert_lock(sdata);
2544
2545         if (!assoc) {
2546                 /*
2547                  * we are not associated yet, the only timer that could be
2548                  * running is the timeout for the association response which
2549                  * which is not relevant anymore.
2550                  */
2551                 del_timer_sync(&sdata->u.mgd.timer);
2552                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2553
2554                 eth_zero_addr(sdata->u.mgd.bssid);
2555                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2556                 sdata->u.mgd.flags = 0;
2557                 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2558                 mutex_lock(&sdata->local->mtx);
2559                 ieee80211_vif_release_channel(sdata);
2560                 mutex_unlock(&sdata->local->mtx);
2561         }
2562
2563         kfree(assoc_data);
2564         sdata->u.mgd.assoc_data = NULL;
2565 }
2566
2567 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2568                                      struct ieee80211_mgmt *mgmt, size_t len)
2569 {
2570         struct ieee80211_local *local = sdata->local;
2571         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2572         u8 *pos;
2573         struct ieee802_11_elems elems;
2574         u32 tx_flags = 0;
2575
2576         pos = mgmt->u.auth.variable;
2577         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2578         if (!elems.challenge)
2579                 return;
2580         auth_data->expected_transaction = 4;
2581         drv_mgd_prepare_tx(sdata->local, sdata);
2582         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2583                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2584                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2585         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2586                             elems.challenge - 2, elems.challenge_len + 2,
2587                             auth_data->bss->bssid, auth_data->bss->bssid,
2588                             auth_data->key, auth_data->key_len,
2589                             auth_data->key_idx, tx_flags);
2590 }
2591
2592 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2593                                    struct ieee80211_mgmt *mgmt, size_t len)
2594 {
2595         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2596         u8 bssid[ETH_ALEN];
2597         u16 auth_alg, auth_transaction, status_code;
2598         struct sta_info *sta;
2599         struct ieee80211_event event = {
2600                 .type = MLME_EVENT,
2601                 .u.mlme.data = AUTH_EVENT,
2602         };
2603
2604         sdata_assert_lock(sdata);
2605
2606         if (len < 24 + 6)
2607                 return;
2608
2609         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2610                 return;
2611
2612         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2613
2614         if (!ether_addr_equal(bssid, mgmt->bssid))
2615                 return;
2616
2617         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2618         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2619         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2620
2621         if (auth_alg != ifmgd->auth_data->algorithm ||
2622             auth_transaction != ifmgd->auth_data->expected_transaction) {
2623                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2624                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2625                            auth_transaction,
2626                            ifmgd->auth_data->expected_transaction);
2627                 return;
2628         }
2629
2630         if (status_code != WLAN_STATUS_SUCCESS) {
2631                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2632                            mgmt->sa, status_code);
2633                 ieee80211_destroy_auth_data(sdata, false);
2634                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2635                 event.u.mlme.status = MLME_DENIED;
2636                 event.u.mlme.reason = status_code;
2637                 drv_event_callback(sdata->local, sdata, &event);
2638                 return;
2639         }
2640
2641         switch (ifmgd->auth_data->algorithm) {
2642         case WLAN_AUTH_OPEN:
2643         case WLAN_AUTH_LEAP:
2644         case WLAN_AUTH_FT:
2645         case WLAN_AUTH_SAE:
2646                 break;
2647         case WLAN_AUTH_SHARED_KEY:
2648                 if (ifmgd->auth_data->expected_transaction != 4) {
2649                         ieee80211_auth_challenge(sdata, mgmt, len);
2650                         /* need another frame */
2651                         return;
2652                 }
2653                 break;
2654         default:
2655                 WARN_ONCE(1, "invalid auth alg %d",
2656                           ifmgd->auth_data->algorithm);
2657                 return;
2658         }
2659
2660         event.u.mlme.status = MLME_SUCCESS;
2661         drv_event_callback(sdata->local, sdata, &event);
2662         sdata_info(sdata, "authenticated\n");
2663         ifmgd->auth_data->done = true;
2664         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2665         ifmgd->auth_data->timeout_started = true;
2666         run_again(sdata, ifmgd->auth_data->timeout);
2667
2668         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2669             ifmgd->auth_data->expected_transaction != 2) {
2670                 /*
2671                  * Report auth frame to user space for processing since another
2672                  * round of Authentication frames is still needed.
2673                  */
2674                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2675                 return;
2676         }
2677
2678         /* move station state to auth */
2679         mutex_lock(&sdata->local->sta_mtx);
2680         sta = sta_info_get(sdata, bssid);
2681         if (!sta) {
2682                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2683                 goto out_err;
2684         }
2685         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2686                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2687                 goto out_err;
2688         }
2689         mutex_unlock(&sdata->local->sta_mtx);
2690
2691         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2692         return;
2693  out_err:
2694         mutex_unlock(&sdata->local->sta_mtx);
2695         /* ignore frame -- wait for timeout */
2696 }
2697
2698 #define case_WLAN(type) \
2699         case WLAN_REASON_##type: return #type
2700
2701 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2702 {
2703         switch (reason_code) {
2704         case_WLAN(UNSPECIFIED);
2705         case_WLAN(PREV_AUTH_NOT_VALID);
2706         case_WLAN(DEAUTH_LEAVING);
2707         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2708         case_WLAN(DISASSOC_AP_BUSY);
2709         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2710         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2711         case_WLAN(DISASSOC_STA_HAS_LEFT);
2712         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2713         case_WLAN(DISASSOC_BAD_POWER);
2714         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2715         case_WLAN(INVALID_IE);
2716         case_WLAN(MIC_FAILURE);
2717         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2718         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2719         case_WLAN(IE_DIFFERENT);
2720         case_WLAN(INVALID_GROUP_CIPHER);
2721         case_WLAN(INVALID_PAIRWISE_CIPHER);
2722         case_WLAN(INVALID_AKMP);
2723         case_WLAN(UNSUPP_RSN_VERSION);
2724         case_WLAN(INVALID_RSN_IE_CAP);
2725         case_WLAN(IEEE8021X_FAILED);
2726         case_WLAN(CIPHER_SUITE_REJECTED);
2727         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2728         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2729         case_WLAN(DISASSOC_LOW_ACK);
2730         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2731         case_WLAN(QSTA_LEAVE_QBSS);
2732         case_WLAN(QSTA_NOT_USE);
2733         case_WLAN(QSTA_REQUIRE_SETUP);
2734         case_WLAN(QSTA_TIMEOUT);
2735         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2736         case_WLAN(MESH_PEER_CANCELED);
2737         case_WLAN(MESH_MAX_PEERS);
2738         case_WLAN(MESH_CONFIG);
2739         case_WLAN(MESH_CLOSE);
2740         case_WLAN(MESH_MAX_RETRIES);
2741         case_WLAN(MESH_CONFIRM_TIMEOUT);
2742         case_WLAN(MESH_INVALID_GTK);
2743         case_WLAN(MESH_INCONSISTENT_PARAM);
2744         case_WLAN(MESH_INVALID_SECURITY);
2745         case_WLAN(MESH_PATH_ERROR);
2746         case_WLAN(MESH_PATH_NOFORWARD);
2747         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2748         case_WLAN(MAC_EXISTS_IN_MBSS);
2749         case_WLAN(MESH_CHAN_REGULATORY);
2750         case_WLAN(MESH_CHAN);
2751         default: return "<unknown>";
2752         }
2753 }
2754
2755 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2756                                      struct ieee80211_mgmt *mgmt, size_t len)
2757 {
2758         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2759         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2760
2761         sdata_assert_lock(sdata);
2762
2763         if (len < 24 + 2)
2764                 return;
2765
2766         if (ifmgd->associated &&
2767             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2768                 const u8 *bssid = ifmgd->associated->bssid;
2769
2770                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2771                            bssid, reason_code,
2772                            ieee80211_get_reason_code_string(reason_code));
2773
2774                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2775
2776                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2777                                             reason_code);
2778                 return;
2779         }
2780
2781         if (ifmgd->assoc_data &&
2782             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2783                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2784
2785                 sdata_info(sdata,
2786                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2787                            bssid, reason_code,
2788                            ieee80211_get_reason_code_string(reason_code));
2789
2790                 ieee80211_destroy_assoc_data(sdata, false);
2791
2792                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2793                 return;
2794         }
2795 }
2796
2797
2798 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2799                                        struct ieee80211_mgmt *mgmt, size_t len)
2800 {
2801         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2802         u16 reason_code;
2803
2804         sdata_assert_lock(sdata);
2805
2806         if (len < 24 + 2)
2807                 return;
2808
2809         if (!ifmgd->associated ||
2810             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2811                 return;
2812
2813         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2814
2815         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2816                    mgmt->sa, reason_code);
2817
2818         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2819
2820         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2821 }
2822
2823 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2824                                 u8 *supp_rates, unsigned int supp_rates_len,
2825                                 u32 *rates, u32 *basic_rates,
2826                                 bool *have_higher_than_11mbit,
2827                                 int *min_rate, int *min_rate_index,
2828                                 int shift, u32 rate_flags)
2829 {
2830         int i, j;
2831
2832         for (i = 0; i < supp_rates_len; i++) {
2833                 int rate = supp_rates[i] & 0x7f;
2834                 bool is_basic = !!(supp_rates[i] & 0x80);
2835
2836                 if ((rate * 5 * (1 << shift)) > 110)
2837                         *have_higher_than_11mbit = true;
2838
2839                 /*
2840                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2841                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2842                  *
2843                  * Note: Even through the membership selector and the basic
2844                  *       rate flag share the same bit, they are not exactly
2845                  *       the same.
2846                  */
2847                 if (!!(supp_rates[i] & 0x80) &&
2848                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2849                         continue;
2850
2851                 for (j = 0; j < sband->n_bitrates; j++) {
2852                         struct ieee80211_rate *br;
2853                         int brate;
2854
2855                         br = &sband->bitrates[j];
2856                         if ((rate_flags & br->flags) != rate_flags)
2857                                 continue;
2858
2859                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2860                         if (brate == rate) {
2861                                 *rates |= BIT(j);
2862                                 if (is_basic)
2863                                         *basic_rates |= BIT(j);
2864                                 if ((rate * 5) < *min_rate) {
2865                                         *min_rate = rate * 5;
2866                                         *min_rate_index = j;
2867                                 }
2868                                 break;
2869                         }
2870                 }
2871         }
2872 }
2873
2874 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2875                                     struct cfg80211_bss *cbss,
2876                                     struct ieee80211_mgmt *mgmt, size_t len)
2877 {
2878         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2879         struct ieee80211_local *local = sdata->local;
2880         struct ieee80211_supported_band *sband;
2881         struct sta_info *sta;
2882         u8 *pos;
2883         u16 capab_info, aid;
2884         struct ieee802_11_elems elems;
2885         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2886         const struct cfg80211_bss_ies *bss_ies = NULL;
2887         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2888         u32 changed = 0;
2889         int err;
2890         bool ret;
2891
2892         /* AssocResp and ReassocResp have identical structure */
2893
2894         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2895         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2896
2897         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2898                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2899                            aid);
2900         aid &= ~(BIT(15) | BIT(14));
2901
2902         ifmgd->broken_ap = false;
2903
2904         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2905                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2906                            aid);
2907                 aid = 0;
2908                 ifmgd->broken_ap = true;
2909         }
2910
2911         pos = mgmt->u.assoc_resp.variable;
2912         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2913
2914         if (!elems.supp_rates) {
2915                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2916                 return false;
2917         }
2918
2919         ifmgd->aid = aid;
2920         ifmgd->tdls_chan_switch_prohibited =
2921                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2922                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2923
2924         /*
2925          * Some APs are erroneously not including some information in their
2926          * (re)association response frames. Try to recover by using the data
2927          * from the beacon or probe response. This seems to afflict mobile
2928          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2929          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2930          */
2931         if ((assoc_data->wmm && !elems.wmm_param) ||
2932             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2933              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2934             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2935              (!elems.vht_cap_elem || !elems.vht_operation))) {
2936                 const struct cfg80211_bss_ies *ies;
2937                 struct ieee802_11_elems bss_elems;
2938
2939                 rcu_read_lock();
2940                 ies = rcu_dereference(cbss->ies);
2941                 if (ies)
2942                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2943                                           GFP_ATOMIC);
2944                 rcu_read_unlock();
2945                 if (!bss_ies)
2946                         return false;
2947
2948                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2949                                        false, &bss_elems);
2950                 if (assoc_data->wmm &&
2951                     !elems.wmm_param && bss_elems.wmm_param) {
2952                         elems.wmm_param = bss_elems.wmm_param;
2953                         sdata_info(sdata,
2954                                    "AP bug: WMM param missing from AssocResp\n");
2955                 }
2956
2957                 /*
2958                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2959                  * have to include the IEs in the (re)association response.
2960                  */
2961                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2962                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2963                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2964                         sdata_info(sdata,
2965                                    "AP bug: HT capability missing from AssocResp\n");
2966                 }
2967                 if (!elems.ht_operation && bss_elems.ht_operation &&
2968                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2969                         elems.ht_operation = bss_elems.ht_operation;
2970                         sdata_info(sdata,
2971                                    "AP bug: HT operation missing from AssocResp\n");
2972                 }
2973                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2974                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2975                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2976                         sdata_info(sdata,
2977                                    "AP bug: VHT capa missing from AssocResp\n");
2978                 }
2979                 if (!elems.vht_operation && bss_elems.vht_operation &&
2980                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2981                         elems.vht_operation = bss_elems.vht_operation;
2982                         sdata_info(sdata,
2983                                    "AP bug: VHT operation missing from AssocResp\n");
2984                 }
2985         }
2986
2987         /*
2988          * We previously checked these in the beacon/probe response, so
2989          * they should be present here. This is just a safety net.
2990          */
2991         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2992             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2993                 sdata_info(sdata,
2994                            "HT AP is missing WMM params or HT capability/operation\n");
2995                 ret = false;
2996                 goto out;
2997         }
2998
2999         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3000             (!elems.vht_cap_elem || !elems.vht_operation)) {
3001                 sdata_info(sdata,
3002                            "VHT AP is missing VHT capability/operation\n");
3003                 ret = false;
3004                 goto out;
3005         }
3006
3007         mutex_lock(&sdata->local->sta_mtx);
3008         /*
3009          * station info was already allocated and inserted before
3010          * the association and should be available to us
3011          */
3012         sta = sta_info_get(sdata, cbss->bssid);
3013         if (WARN_ON(!sta)) {
3014                 mutex_unlock(&sdata->local->sta_mtx);
3015                 ret = false;
3016                 goto out;
3017         }
3018
3019         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3020
3021         /* Set up internal HT/VHT capabilities */
3022         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3023                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3024                                                   elems.ht_cap_elem, sta);
3025
3026         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3027                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3028                                                     elems.vht_cap_elem, sta);
3029
3030         /*
3031          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3032          * in their association response, so ignore that data for our own
3033          * configuration. If it changed since the last beacon, we'll get the
3034          * next beacon and update then.
3035          */
3036
3037         /*
3038          * If an operating mode notification IE is present, override the
3039          * NSS calculation (that would be done in rate_control_rate_init())
3040          * and use the # of streams from that element.
3041          */
3042         if (elems.opmode_notif &&
3043             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3044                 u8 nss;
3045
3046                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3047                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3048                 nss += 1;
3049                 sta->sta.rx_nss = nss;
3050         }
3051
3052         rate_control_rate_init(sta);
3053
3054         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
3055                 set_sta_flag(sta, WLAN_STA_MFP);
3056
3057         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3058
3059         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3060         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3061                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3062         if (err) {
3063                 sdata_info(sdata,
3064                            "failed to move station %pM to desired state\n",
3065                            sta->sta.addr);
3066                 WARN_ON(__sta_info_destroy(sta));
3067                 mutex_unlock(&sdata->local->sta_mtx);
3068                 ret = false;
3069                 goto out;
3070         }
3071
3072         mutex_unlock(&sdata->local->sta_mtx);
3073
3074         /*
3075          * Always handle WMM once after association regardless
3076          * of the first value the AP uses. Setting -1 here has
3077          * that effect because the AP values is an unsigned
3078          * 4-bit value.
3079          */
3080         ifmgd->wmm_last_param_set = -1;
3081
3082         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3083                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3084                                          elems.wmm_param_len);
3085         else
3086                 ieee80211_set_wmm_default(sdata, false);
3087         changed |= BSS_CHANGED_QOS;
3088
3089         /* set AID and assoc capability,
3090          * ieee80211_set_associated() will tell the driver */
3091         bss_conf->aid = aid;
3092         bss_conf->assoc_capability = capab_info;
3093         ieee80211_set_associated(sdata, cbss, changed);
3094
3095         /*
3096          * If we're using 4-addr mode, let the AP know that we're
3097          * doing so, so that it can create the STA VLAN on its side
3098          */
3099         if (ifmgd->use_4addr)
3100                 ieee80211_send_4addr_nullfunc(local, sdata);
3101
3102         /*
3103          * Start timer to probe the connection to the AP now.
3104          * Also start the timer that will detect beacon loss.
3105          */
3106         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3107         ieee80211_sta_reset_beacon_monitor(sdata);
3108
3109         ret = true;
3110  out:
3111         kfree(bss_ies);
3112         return ret;
3113 }
3114
3115 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3116                                          struct ieee80211_mgmt *mgmt,
3117                                          size_t len)
3118 {
3119         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3120         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3121         u16 capab_info, status_code, aid;
3122         struct ieee802_11_elems elems;
3123         int ac, uapsd_queues = -1;
3124         u8 *pos;
3125         bool reassoc;
3126         struct cfg80211_bss *bss;
3127         struct ieee80211_event event = {
3128                 .type = MLME_EVENT,
3129                 .u.mlme.data = ASSOC_EVENT,
3130         };
3131
3132         sdata_assert_lock(sdata);
3133
3134         if (!assoc_data)
3135                 return;
3136         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3137                 return;
3138
3139         /*
3140          * AssocResp and ReassocResp have identical structure, so process both
3141          * of them in this function.
3142          */
3143
3144         if (len < 24 + 6)
3145                 return;
3146
3147         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3148         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3149         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3150         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3151
3152         sdata_info(sdata,
3153                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3154                    reassoc ? "Rea" : "A", mgmt->sa,
3155                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3156
3157         pos = mgmt->u.assoc_resp.variable;
3158         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3159
3160         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3161             elems.timeout_int &&
3162             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3163                 u32 tu, ms;
3164                 tu = le32_to_cpu(elems.timeout_int->value);
3165                 ms = tu * 1024 / 1000;
3166                 sdata_info(sdata,
3167                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3168                            mgmt->sa, tu, ms);
3169                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3170                 assoc_data->timeout_started = true;
3171                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3172                         run_again(sdata, assoc_data->timeout);
3173                 return;
3174         }
3175
3176         bss = assoc_data->bss;
3177
3178         if (status_code != WLAN_STATUS_SUCCESS) {
3179                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3180                            mgmt->sa, status_code);
3181                 ieee80211_destroy_assoc_data(sdata, false);
3182                 event.u.mlme.status = MLME_DENIED;
3183                 event.u.mlme.reason = status_code;
3184                 drv_event_callback(sdata->local, sdata, &event);
3185         } else {
3186                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3187                         /* oops -- internal error -- send timeout for now */
3188                         ieee80211_destroy_assoc_data(sdata, false);
3189                         cfg80211_assoc_timeout(sdata->dev, bss);
3190                         return;
3191                 }
3192                 event.u.mlme.status = MLME_SUCCESS;
3193                 drv_event_callback(sdata->local, sdata, &event);
3194                 sdata_info(sdata, "associated\n");
3195
3196                 /*
3197                  * destroy assoc_data afterwards, as otherwise an idle
3198                  * recalc after assoc_data is NULL but before associated
3199                  * is set can cause the interface to go idle
3200                  */
3201                 ieee80211_destroy_assoc_data(sdata, true);
3202
3203                 /* get uapsd queues configuration */
3204                 uapsd_queues = 0;
3205                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3206                         if (sdata->tx_conf[ac].uapsd)
3207                                 uapsd_queues |= BIT(ac);
3208         }
3209
3210         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3211 }
3212
3213 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3214                                   struct ieee80211_mgmt *mgmt, size_t len,
3215                                   struct ieee80211_rx_status *rx_status,
3216                                   struct ieee802_11_elems *elems)
3217 {
3218         struct ieee80211_local *local = sdata->local;
3219         struct ieee80211_bss *bss;
3220         struct ieee80211_channel *channel;
3221
3222         sdata_assert_lock(sdata);
3223
3224         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3225         if (!channel)
3226                 return;
3227
3228         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3229                                         channel);
3230         if (bss) {
3231                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3232                 ieee80211_rx_bss_put(local, bss);
3233         }
3234 }
3235
3236
3237 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3238                                          struct sk_buff *skb)
3239 {
3240         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3241         struct ieee80211_if_managed *ifmgd;
3242         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3243         size_t baselen, len = skb->len;
3244         struct ieee802_11_elems elems;
3245
3246         ifmgd = &sdata->u.mgd;
3247
3248         sdata_assert_lock(sdata);
3249
3250         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3251                 return; /* ignore ProbeResp to foreign address */
3252
3253         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3254         if (baselen > len)
3255                 return;
3256
3257         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3258                                false, &elems);
3259
3260         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3261
3262         if (ifmgd->associated &&
3263             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3264                 ieee80211_reset_ap_probe(sdata);
3265
3266         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3267             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3268                 /* got probe response, continue with auth */
3269                 sdata_info(sdata, "direct probe responded\n");
3270                 ifmgd->auth_data->tries = 0;
3271                 ifmgd->auth_data->timeout = jiffies;
3272                 ifmgd->auth_data->timeout_started = true;
3273                 run_again(sdata, ifmgd->auth_data->timeout);
3274         }
3275 }
3276
3277 /*
3278  * This is the canonical list of information elements we care about,
3279  * the filter code also gives us all changes to the Microsoft OUI
3280  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3281  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3282  * changes to requested client power.
3283  *
3284  * We implement beacon filtering in software since that means we can
3285  * avoid processing the frame here and in cfg80211, and userspace
3286  * will not be able to tell whether the hardware supports it or not.
3287  *
3288  * XXX: This list needs to be dynamic -- userspace needs to be able to
3289  *      add items it requires. It also needs to be able to tell us to
3290  *      look out for other vendor IEs.
3291  */
3292 static const u64 care_about_ies =
3293         (1ULL << WLAN_EID_COUNTRY) |
3294         (1ULL << WLAN_EID_ERP_INFO) |
3295         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3296         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3297         (1ULL << WLAN_EID_HT_CAPABILITY) |
3298         (1ULL << WLAN_EID_HT_OPERATION) |
3299         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3300
3301 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3302                                      struct ieee80211_mgmt *mgmt, size_t len,
3303                                      struct ieee80211_rx_status *rx_status)
3304 {
3305         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3306         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3307         size_t baselen;
3308         struct ieee802_11_elems elems;
3309         struct ieee80211_local *local = sdata->local;
3310         struct ieee80211_chanctx_conf *chanctx_conf;
3311         struct ieee80211_channel *chan;
3312         struct sta_info *sta;
3313         u32 changed = 0;
3314         bool erp_valid;
3315         u8 erp_value = 0;
3316         u32 ncrc;
3317         u8 *bssid;
3318         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3319
3320         sdata_assert_lock(sdata);
3321
3322         /* Process beacon from the current BSS */
3323         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3324         if (baselen > len)
3325                 return;
3326
3327         rcu_read_lock();
3328         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3329         if (!chanctx_conf) {
3330                 rcu_read_unlock();
3331                 return;
3332         }
3333
3334         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3335                 rcu_read_unlock();
3336                 return;
3337         }
3338         chan = chanctx_conf->def.chan;
3339         rcu_read_unlock();
3340
3341         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3342             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3343                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3344                                        len - baselen, false, &elems);
3345
3346                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3347                 if (elems.tim && !elems.parse_error) {
3348                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3349                         ifmgd->dtim_period = tim_ie->dtim_period;
3350                 }
3351                 ifmgd->have_beacon = true;
3352                 ifmgd->assoc_data->need_beacon = false;
3353                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3354                         sdata->vif.bss_conf.sync_tsf =
3355                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3356                         sdata->vif.bss_conf.sync_device_ts =
3357                                 rx_status->device_timestamp;
3358                         if (elems.tim)
3359                                 sdata->vif.bss_conf.sync_dtim_count =
3360                                         elems.tim->dtim_count;
3361                         else
3362                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3363                 }
3364                 /* continue assoc process */
3365                 ifmgd->assoc_data->timeout = jiffies;
3366                 ifmgd->assoc_data->timeout_started = true;
3367                 run_again(sdata, ifmgd->assoc_data->timeout);
3368                 return;
3369         }
3370
3371         if (!ifmgd->associated ||
3372             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3373                 return;
3374         bssid = ifmgd->associated->bssid;
3375
3376         /* Track average RSSI from the Beacon frames of the current AP */
3377         ifmgd->last_beacon_signal = rx_status->signal;
3378         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3379                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3380                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3381                 ifmgd->last_cqm_event_signal = 0;
3382                 ifmgd->count_beacon_signal = 1;
3383                 ifmgd->last_ave_beacon_signal = 0;
3384         } else {
3385                 ifmgd->ave_beacon_signal =
3386                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3387                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3388                          ifmgd->ave_beacon_signal) / 16;
3389                 ifmgd->count_beacon_signal++;
3390         }
3391
3392         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3393             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3394                 int sig = ifmgd->ave_beacon_signal;
3395                 int last_sig = ifmgd->last_ave_beacon_signal;
3396                 struct ieee80211_event event = {
3397                         .type = RSSI_EVENT,
3398                 };
3399
3400                 /*
3401                  * if signal crosses either of the boundaries, invoke callback
3402                  * with appropriate parameters
3403                  */
3404                 if (sig > ifmgd->rssi_max_thold &&
3405                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3406                         ifmgd->last_ave_beacon_signal = sig;
3407                         event.u.rssi.data = RSSI_EVENT_HIGH;
3408                         drv_event_callback(local, sdata, &event);
3409                 } else if (sig < ifmgd->rssi_min_thold &&
3410                            (last_sig >= ifmgd->rssi_max_thold ||
3411                            last_sig == 0)) {
3412                         ifmgd->last_ave_beacon_signal = sig;
3413                         event.u.rssi.data = RSSI_EVENT_LOW;
3414                         drv_event_callback(local, sdata, &event);
3415                 }
3416         }
3417
3418         if (bss_conf->cqm_rssi_thold &&
3419             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3420             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3421                 int sig = ifmgd->ave_beacon_signal / 16;
3422                 int last_event = ifmgd->last_cqm_event_signal;
3423                 int thold = bss_conf->cqm_rssi_thold;
3424                 int hyst = bss_conf->cqm_rssi_hyst;
3425                 if (sig < thold &&
3426                     (last_event == 0 || sig < last_event - hyst)) {
3427                         ifmgd->last_cqm_event_signal = sig;
3428                         ieee80211_cqm_rssi_notify(
3429                                 &sdata->vif,
3430                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3431                                 GFP_KERNEL);
3432                 } else if (sig > thold &&
3433                            (last_event == 0 || sig > last_event + hyst)) {
3434                         ifmgd->last_cqm_event_signal = sig;
3435                         ieee80211_cqm_rssi_notify(
3436                                 &sdata->vif,
3437                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3438                                 GFP_KERNEL);
3439                 }
3440         }
3441
3442         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3443                 mlme_dbg_ratelimited(sdata,
3444                                      "cancelling AP probe due to a received beacon\n");
3445                 ieee80211_reset_ap_probe(sdata);
3446         }
3447
3448         /*
3449          * Push the beacon loss detection into the future since
3450          * we are processing a beacon from the AP just now.
3451          */
3452         ieee80211_sta_reset_beacon_monitor(sdata);
3453
3454         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3455         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3456                                           len - baselen, false, &elems,
3457                                           care_about_ies, ncrc);
3458
3459         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) {
3460                 bool directed_tim = ieee80211_check_tim(elems.tim,
3461                                                         elems.tim_len,
3462                                                         ifmgd->aid);
3463                 if (directed_tim) {
3464                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3465                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3466                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3467                                         ieee80211_hw_config(local,
3468                                                             IEEE80211_CONF_CHANGE_PS);
3469                                 }
3470                                 ieee80211_send_nullfunc(local, sdata, 0);
3471                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3472                                 local->pspolling = true;
3473
3474                                 /*
3475                                  * Here is assumed that the driver will be
3476                                  * able to send ps-poll frame and receive a
3477                                  * response even though power save mode is
3478                                  * enabled, but some drivers might require
3479                                  * to disable power save here. This needs
3480                                  * to be investigated.
3481                                  */
3482                                 ieee80211_send_pspoll(local, sdata);
3483                         }
3484                 }
3485         }
3486
3487         if (sdata->vif.p2p) {
3488                 struct ieee80211_p2p_noa_attr noa = {};
3489                 int ret;
3490
3491                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3492                                             len - baselen,
3493                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3494                                             (u8 *) &noa, sizeof(noa));
3495                 if (ret >= 2) {
3496                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3497                                 /* valid noa_attr and index changed */
3498                                 sdata->u.mgd.p2p_noa_index = noa.index;
3499                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3500                                 changed |= BSS_CHANGED_P2P_PS;
3501                                 /*
3502                                  * make sure we update all information, the CRC
3503                                  * mechanism doesn't look at P2P attributes.
3504                                  */
3505                                 ifmgd->beacon_crc_valid = false;
3506                         }
3507                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3508                         /* noa_attr not found and we had valid noa_attr before */
3509                         sdata->u.mgd.p2p_noa_index = -1;
3510                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3511                         changed |= BSS_CHANGED_P2P_PS;
3512                         ifmgd->beacon_crc_valid = false;
3513                 }
3514         }
3515
3516         if (ifmgd->csa_waiting_bcn)
3517                 ieee80211_chswitch_post_beacon(sdata);
3518
3519         /*
3520          * Update beacon timing and dtim count on every beacon appearance. This
3521          * will allow the driver to use the most updated values. Do it before
3522          * comparing this one with last received beacon.
3523          * IMPORTANT: These parameters would possibly be out of sync by the time
3524          * the driver will use them. The synchronized view is currently
3525          * guaranteed only in certain callbacks.
3526          */
3527         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3528                 sdata->vif.bss_conf.sync_tsf =
3529                         le64_to_cpu(mgmt->u.beacon.timestamp);
3530                 sdata->vif.bss_conf.sync_device_ts =
3531                         rx_status->device_timestamp;
3532                 if (elems.tim)
3533                         sdata->vif.bss_conf.sync_dtim_count =
3534                                 elems.tim->dtim_count;
3535                 else
3536                         sdata->vif.bss_conf.sync_dtim_count = 0;
3537         }
3538
3539         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3540                 return;
3541         ifmgd->beacon_crc = ncrc;
3542         ifmgd->beacon_crc_valid = true;
3543
3544         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3545
3546         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3547                                          rx_status->device_timestamp,
3548                                          &elems, true);
3549
3550         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3551             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3552                                      elems.wmm_param_len))
3553                 changed |= BSS_CHANGED_QOS;
3554
3555         /*
3556          * If we haven't had a beacon before, tell the driver about the
3557          * DTIM period (and beacon timing if desired) now.
3558          */
3559         if (!ifmgd->have_beacon) {
3560                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3561                 if (elems.tim)
3562                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3563                 else
3564                         bss_conf->dtim_period = 1;
3565
3566                 changed |= BSS_CHANGED_BEACON_INFO;
3567                 ifmgd->have_beacon = true;
3568
3569                 mutex_lock(&local->iflist_mtx);
3570                 ieee80211_recalc_ps(local, -1);
3571                 mutex_unlock(&local->iflist_mtx);
3572
3573                 ieee80211_recalc_ps_vif(sdata);
3574         }
3575
3576         if (elems.erp_info) {
3577                 erp_valid = true;
3578                 erp_value = elems.erp_info[0];
3579         } else {
3580                 erp_valid = false;
3581         }
3582         changed |= ieee80211_handle_bss_capability(sdata,
3583                         le16_to_cpu(mgmt->u.beacon.capab_info),
3584                         erp_valid, erp_value);
3585
3586         mutex_lock(&local->sta_mtx);
3587         sta = sta_info_get(sdata, bssid);
3588
3589         if (ieee80211_config_bw(sdata, sta,
3590                                 elems.ht_cap_elem, elems.ht_operation,
3591                                 elems.vht_operation, bssid, &changed)) {
3592                 mutex_unlock(&local->sta_mtx);
3593                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3594                                        WLAN_REASON_DEAUTH_LEAVING,
3595                                        true, deauth_buf);
3596                 ieee80211_report_disconnect(sdata, deauth_buf,
3597                                             sizeof(deauth_buf), true,
3598                                             WLAN_REASON_DEAUTH_LEAVING);
3599                 return;
3600         }
3601
3602         if (sta && elems.opmode_notif)
3603                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3604                                             rx_status->band, true);
3605         mutex_unlock(&local->sta_mtx);
3606
3607         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3608                                                elems.country_elem,
3609                                                elems.country_elem_len,
3610                                                elems.pwr_constr_elem,
3611                                                elems.cisco_dtpc_elem);
3612
3613         ieee80211_bss_info_change_notify(sdata, changed);
3614 }
3615
3616 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3617                                   struct sk_buff *skb)
3618 {
3619         struct ieee80211_rx_status *rx_status;
3620         struct ieee80211_mgmt *mgmt;
3621         u16 fc;
3622         struct ieee802_11_elems elems;
3623         int ies_len;
3624
3625         rx_status = (struct ieee80211_rx_status *) skb->cb;
3626         mgmt = (struct ieee80211_mgmt *) skb->data;
3627         fc = le16_to_cpu(mgmt->frame_control);
3628
3629         sdata_lock(sdata);
3630
3631         switch (fc & IEEE80211_FCTL_STYPE) {
3632         case IEEE80211_STYPE_BEACON:
3633                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3634                 break;
3635         case IEEE80211_STYPE_PROBE_RESP:
3636                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3637                 break;
3638         case IEEE80211_STYPE_AUTH:
3639                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3640                 break;
3641         case IEEE80211_STYPE_DEAUTH:
3642                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3643                 break;
3644         case IEEE80211_STYPE_DISASSOC:
3645                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3646                 break;
3647         case IEEE80211_STYPE_ASSOC_RESP:
3648         case IEEE80211_STYPE_REASSOC_RESP:
3649                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3650                 break;
3651         case IEEE80211_STYPE_ACTION:
3652                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3653                         ies_len = skb->len -
3654                                   offsetof(struct ieee80211_mgmt,
3655                                            u.action.u.chan_switch.variable);
3656
3657                         if (ies_len < 0)
3658                                 break;
3659
3660                         ieee802_11_parse_elems(
3661                                 mgmt->u.action.u.chan_switch.variable,
3662                                 ies_len, true, &elems);
3663
3664                         if (elems.parse_error)
3665                                 break;
3666
3667                         ieee80211_sta_process_chanswitch(sdata,
3668                                                  rx_status->mactime,
3669                                                  rx_status->device_timestamp,
3670                                                  &elems, false);
3671                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3672                         ies_len = skb->len -
3673                                   offsetof(struct ieee80211_mgmt,
3674                                            u.action.u.ext_chan_switch.variable);
3675
3676                         if (ies_len < 0)
3677                                 break;
3678
3679                         ieee802_11_parse_elems(
3680                                 mgmt->u.action.u.ext_chan_switch.variable,
3681                                 ies_len, true, &elems);
3682
3683                         if (elems.parse_error)
3684                                 break;
3685
3686                         /* for the handling code pretend this was also an IE */
3687                         elems.ext_chansw_ie =
3688                                 &mgmt->u.action.u.ext_chan_switch.data;
3689
3690                         ieee80211_sta_process_chanswitch(sdata,
3691                                                  rx_status->mactime,
3692                                                  rx_status->device_timestamp,
3693                                                  &elems, false);
3694                 }
3695                 break;
3696         }
3697         sdata_unlock(sdata);
3698 }
3699
3700 static void ieee80211_sta_timer(unsigned long data)
3701 {
3702         struct ieee80211_sub_if_data *sdata =
3703                 (struct ieee80211_sub_if_data *) data;
3704
3705         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3706 }
3707
3708 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3709                                           u8 *bssid, u8 reason, bool tx)
3710 {
3711         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3712
3713         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3714                                tx, frame_buf);
3715
3716         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3717                                     reason);
3718 }
3719
3720 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3721 {
3722         struct ieee80211_local *local = sdata->local;
3723         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3724         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3725         u32 tx_flags = 0;
3726
3727         sdata_assert_lock(sdata);
3728
3729         if (WARN_ON_ONCE(!auth_data))
3730                 return -EINVAL;
3731
3732         auth_data->tries++;
3733
3734         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3735                 sdata_info(sdata, "authentication with %pM timed out\n",
3736                            auth_data->bss->bssid);
3737
3738                 /*
3739                  * Most likely AP is not in the range so remove the
3740                  * bss struct for that AP.
3741                  */
3742                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3743
3744                 return -ETIMEDOUT;
3745         }
3746
3747         drv_mgd_prepare_tx(local, sdata);
3748
3749         if (auth_data->bss->proberesp_ies) {
3750                 u16 trans = 1;
3751                 u16 status = 0;
3752
3753                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3754                            auth_data->bss->bssid, auth_data->tries,
3755                            IEEE80211_AUTH_MAX_TRIES);
3756
3757                 auth_data->expected_transaction = 2;
3758
3759                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3760                         trans = auth_data->sae_trans;
3761                         status = auth_data->sae_status;
3762                         auth_data->expected_transaction = trans;
3763                 }
3764
3765                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3766                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3767                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3768
3769                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3770                                     auth_data->data, auth_data->data_len,
3771                                     auth_data->bss->bssid,
3772                                     auth_data->bss->bssid, NULL, 0, 0,
3773                                     tx_flags);
3774         } else {
3775                 const u8 *ssidie;
3776
3777                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3778                            auth_data->bss->bssid, auth_data->tries,
3779                            IEEE80211_AUTH_MAX_TRIES);
3780
3781                 rcu_read_lock();
3782                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3783                 if (!ssidie) {
3784                         rcu_read_unlock();
3785                         return -EINVAL;
3786                 }
3787                 /*
3788                  * Direct probe is sent to broadcast address as some APs
3789                  * will not answer to direct packet in unassociated state.
3790                  */
3791                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3792                                          ssidie + 2, ssidie[1],
3793                                          NULL, 0, (u32) -1, true, 0,
3794                                          auth_data->bss->channel, false);
3795                 rcu_read_unlock();
3796         }
3797
3798         if (tx_flags == 0) {
3799                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3800                 auth_data->timeout_started = true;
3801                 run_again(sdata, auth_data->timeout);
3802         } else {
3803                 auth_data->timeout =
3804                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3805                 auth_data->timeout_started = true;
3806                 run_again(sdata, auth_data->timeout);
3807         }
3808
3809         return 0;
3810 }
3811
3812 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3813 {
3814         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3815         struct ieee80211_local *local = sdata->local;
3816
3817         sdata_assert_lock(sdata);
3818
3819         assoc_data->tries++;
3820         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3821                 sdata_info(sdata, "association with %pM timed out\n",
3822                            assoc_data->bss->bssid);
3823
3824                 /*
3825                  * Most likely AP is not in the range so remove the
3826                  * bss struct for that AP.
3827                  */
3828                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3829
3830                 return -ETIMEDOUT;
3831         }
3832
3833         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3834                    assoc_data->bss->bssid, assoc_data->tries,
3835                    IEEE80211_ASSOC_MAX_TRIES);
3836         ieee80211_send_assoc(sdata);
3837
3838         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3839                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3840                 assoc_data->timeout_started = true;
3841                 run_again(sdata, assoc_data->timeout);
3842         } else {
3843                 assoc_data->timeout =
3844                         round_jiffies_up(jiffies +
3845                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3846                 assoc_data->timeout_started = true;
3847                 run_again(sdata, assoc_data->timeout);
3848         }
3849
3850         return 0;
3851 }
3852
3853 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3854                                   __le16 fc, bool acked)
3855 {
3856         struct ieee80211_local *local = sdata->local;
3857
3858         sdata->u.mgd.status_fc = fc;
3859         sdata->u.mgd.status_acked = acked;
3860         sdata->u.mgd.status_received = true;
3861
3862         ieee80211_queue_work(&local->hw, &sdata->work);
3863 }
3864
3865 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3866 {
3867         struct ieee80211_local *local = sdata->local;
3868         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3869
3870         sdata_lock(sdata);
3871
3872         if (ifmgd->status_received) {
3873                 __le16 fc = ifmgd->status_fc;
3874                 bool status_acked = ifmgd->status_acked;
3875
3876                 ifmgd->status_received = false;
3877                 if (ifmgd->auth_data &&
3878                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3879                         if (status_acked) {
3880                                 ifmgd->auth_data->timeout =
3881                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3882                                 run_again(sdata, ifmgd->auth_data->timeout);
3883                         } else {
3884                                 ifmgd->auth_data->timeout = jiffies - 1;
3885                         }
3886                         ifmgd->auth_data->timeout_started = true;
3887                 } else if (ifmgd->assoc_data &&
3888                            (ieee80211_is_assoc_req(fc) ||
3889                             ieee80211_is_reassoc_req(fc))) {
3890                         if (status_acked) {
3891                                 ifmgd->assoc_data->timeout =
3892                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3893                                 run_again(sdata, ifmgd->assoc_data->timeout);
3894                         } else {
3895                                 ifmgd->assoc_data->timeout = jiffies - 1;
3896                         }
3897                         ifmgd->assoc_data->timeout_started = true;
3898                 }
3899         }
3900
3901         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3902             time_after(jiffies, ifmgd->auth_data->timeout)) {
3903                 if (ifmgd->auth_data->done) {
3904                         /*
3905                          * ok ... we waited for assoc but userspace didn't,
3906                          * so let's just kill the auth data
3907                          */
3908                         ieee80211_destroy_auth_data(sdata, false);
3909                 } else if (ieee80211_probe_auth(sdata)) {
3910                         u8 bssid[ETH_ALEN];
3911                         struct ieee80211_event event = {
3912                                 .type = MLME_EVENT,
3913                                 .u.mlme.data = AUTH_EVENT,
3914                                 .u.mlme.status = MLME_TIMEOUT,
3915                         };
3916
3917                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3918
3919                         ieee80211_destroy_auth_data(sdata, false);
3920
3921                         cfg80211_auth_timeout(sdata->dev, bssid);
3922                         drv_event_callback(sdata->local, sdata, &event);
3923                 }
3924         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3925                 run_again(sdata, ifmgd->auth_data->timeout);
3926
3927         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3928             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3929                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3930                     ieee80211_do_assoc(sdata)) {
3931                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3932                         struct ieee80211_event event = {
3933                                 .type = MLME_EVENT,
3934                                 .u.mlme.data = ASSOC_EVENT,
3935                                 .u.mlme.status = MLME_TIMEOUT,
3936                         };
3937
3938                         ieee80211_destroy_assoc_data(sdata, false);
3939                         cfg80211_assoc_timeout(sdata->dev, bss);
3940                         drv_event_callback(sdata->local, sdata, &event);
3941                 }
3942         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3943                 run_again(sdata, ifmgd->assoc_data->timeout);
3944
3945         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3946             ifmgd->associated) {
3947                 u8 bssid[ETH_ALEN];
3948                 int max_tries;
3949
3950                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3951
3952                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3953                         max_tries = max_nullfunc_tries;
3954                 else
3955                         max_tries = max_probe_tries;
3956
3957                 /* ACK received for nullfunc probing frame */
3958                 if (!ifmgd->probe_send_count)
3959                         ieee80211_reset_ap_probe(sdata);
3960                 else if (ifmgd->nullfunc_failed) {
3961                         if (ifmgd->probe_send_count < max_tries) {
3962                                 mlme_dbg(sdata,
3963                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3964                                          bssid, ifmgd->probe_send_count,
3965                                          max_tries);
3966                                 ieee80211_mgd_probe_ap_send(sdata);
3967                         } else {
3968                                 mlme_dbg(sdata,
3969                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3970                                          bssid);
3971                                 ieee80211_sta_connection_lost(sdata, bssid,
3972                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3973                                         false);
3974                         }
3975                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3976                         run_again(sdata, ifmgd->probe_timeout);
3977                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3978                         mlme_dbg(sdata,
3979                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3980                                  bssid, probe_wait_ms);
3981                         ieee80211_sta_connection_lost(sdata, bssid,
3982                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3983                 } else if (ifmgd->probe_send_count < max_tries) {
3984                         mlme_dbg(sdata,
3985                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3986                                  bssid, probe_wait_ms,
3987                                  ifmgd->probe_send_count, max_tries);
3988                         ieee80211_mgd_probe_ap_send(sdata);
3989                 } else {
3990                         /*
3991                          * We actually lost the connection ... or did we?
3992                          * Let's make sure!
3993                          */
3994                         wiphy_debug(local->hw.wiphy,
3995                                     "%s: No probe response from AP %pM"
3996                                     " after %dms, disconnecting.\n",
3997                                     sdata->name,
3998                                     bssid, probe_wait_ms);
3999
4000                         ieee80211_sta_connection_lost(sdata, bssid,
4001                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4002                 }
4003         }
4004
4005         sdata_unlock(sdata);
4006 }
4007
4008 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
4009 {
4010         struct ieee80211_sub_if_data *sdata =
4011                 (struct ieee80211_sub_if_data *) data;
4012         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4013
4014         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4015                 return;
4016
4017         sdata->u.mgd.connection_loss = false;
4018         ieee80211_queue_work(&sdata->local->hw,
4019                              &sdata->u.mgd.beacon_connection_loss_work);
4020 }
4021
4022 static void ieee80211_sta_conn_mon_timer(unsigned long data)
4023 {
4024         struct ieee80211_sub_if_data *sdata =
4025                 (struct ieee80211_sub_if_data *) data;
4026         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4027         struct ieee80211_local *local = sdata->local;
4028
4029         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4030                 return;
4031
4032         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4033 }
4034
4035 static void ieee80211_sta_monitor_work(struct work_struct *work)
4036 {
4037         struct ieee80211_sub_if_data *sdata =
4038                 container_of(work, struct ieee80211_sub_if_data,
4039                              u.mgd.monitor_work);
4040
4041         ieee80211_mgd_probe_ap(sdata, false);
4042 }
4043
4044 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4045 {
4046         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4047                 __ieee80211_stop_poll(sdata);
4048
4049                 /* let's probe the connection once */
4050                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4051                         ieee80211_queue_work(&sdata->local->hw,
4052                                              &sdata->u.mgd.monitor_work);
4053                 /* and do all the other regular work too */
4054                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4055         }
4056 }
4057
4058 #ifdef CONFIG_PM
4059 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4060 {
4061         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4062         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4063
4064         sdata_lock(sdata);
4065
4066         if (ifmgd->auth_data || ifmgd->assoc_data) {
4067                 const u8 *bssid = ifmgd->auth_data ?
4068                                 ifmgd->auth_data->bss->bssid :
4069                                 ifmgd->assoc_data->bss->bssid;
4070
4071                 /*
4072                  * If we are trying to authenticate / associate while suspending,
4073                  * cfg80211 won't know and won't actually abort those attempts,
4074                  * thus we need to do that ourselves.
4075                  */
4076                 ieee80211_send_deauth_disassoc(sdata, bssid,
4077                                                IEEE80211_STYPE_DEAUTH,
4078                                                WLAN_REASON_DEAUTH_LEAVING,
4079                                                false, frame_buf);
4080                 if (ifmgd->assoc_data)
4081                         ieee80211_destroy_assoc_data(sdata, false);
4082                 if (ifmgd->auth_data)
4083                         ieee80211_destroy_auth_data(sdata, false);
4084                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4085                                       IEEE80211_DEAUTH_FRAME_LEN);
4086         }
4087
4088         /* This is a bit of a hack - we should find a better and more generic
4089          * solution to this. Normally when suspending, cfg80211 will in fact
4090          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4091          * auth (not so important) or assoc (this is the problem) process.
4092          *
4093          * As a consequence, it can happen that we are in the process of both
4094          * associating and suspending, and receive an association response
4095          * after cfg80211 has checked if it needs to disconnect, but before
4096          * we actually set the flag to drop incoming frames. This will then
4097          * cause the workqueue flush to process the association response in
4098          * the suspend, resulting in a successful association just before it
4099          * tries to remove the interface from the driver, which now though
4100          * has a channel context assigned ... this results in issues.
4101          *
4102          * To work around this (for now) simply deauth here again if we're
4103          * now connected.
4104          */
4105         if (ifmgd->associated && !sdata->local->wowlan) {
4106                 u8 bssid[ETH_ALEN];
4107                 struct cfg80211_deauth_request req = {
4108                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4109                         .bssid = bssid,
4110                 };
4111
4112                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4113                 ieee80211_mgd_deauth(sdata, &req);
4114         }
4115
4116         sdata_unlock(sdata);
4117 }
4118
4119 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4120 {
4121         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4122
4123         sdata_lock(sdata);
4124         if (!ifmgd->associated) {
4125                 sdata_unlock(sdata);
4126                 return;
4127         }
4128
4129         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4130                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4131                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4132                 ieee80211_sta_connection_lost(sdata,
4133                                               ifmgd->associated->bssid,
4134                                               WLAN_REASON_UNSPECIFIED,
4135                                               true);
4136                 sdata_unlock(sdata);
4137                 return;
4138         }
4139         sdata_unlock(sdata);
4140 }
4141 #endif
4142
4143 /* interface setup */
4144 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4145 {
4146         struct ieee80211_if_managed *ifmgd;
4147
4148         ifmgd = &sdata->u.mgd;
4149         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4150         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4151         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4152                   ieee80211_beacon_connection_loss_work);
4153         INIT_WORK(&ifmgd->csa_connection_drop_work,
4154                   ieee80211_csa_connection_drop_work);
4155         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4156         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4157                           ieee80211_tdls_peer_del_work);
4158         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4159                     (unsigned long) sdata);
4160         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4161                     (unsigned long) sdata);
4162         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4163                     (unsigned long) sdata);
4164         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4165                     (unsigned long) sdata);
4166         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4167                           ieee80211_sta_handle_tspec_ac_params_wk);
4168
4169         ifmgd->flags = 0;
4170         ifmgd->powersave = sdata->wdev.ps;
4171         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4172         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4173         ifmgd->p2p_noa_index = -1;
4174
4175         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4176                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4177         else
4178                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4179
4180         /* Setup TDLS data */
4181         spin_lock_init(&ifmgd->teardown_lock);
4182         ifmgd->teardown_skb = NULL;
4183         ifmgd->orig_teardown_skb = NULL;
4184 }
4185
4186 /* scan finished notification */
4187 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4188 {
4189         struct ieee80211_sub_if_data *sdata;
4190
4191         /* Restart STA timers */
4192         rcu_read_lock();
4193         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4194                 if (ieee80211_sdata_running(sdata))
4195                         ieee80211_restart_sta_timer(sdata);
4196         }
4197         rcu_read_unlock();
4198 }
4199
4200 int ieee80211_max_network_latency(struct notifier_block *nb,
4201                                   unsigned long data, void *dummy)
4202 {
4203         s32 latency_usec = (s32) data;
4204         struct ieee80211_local *local =
4205                 container_of(nb, struct ieee80211_local,
4206                              network_latency_notifier);
4207
4208         mutex_lock(&local->iflist_mtx);
4209         ieee80211_recalc_ps(local, latency_usec);
4210         mutex_unlock(&local->iflist_mtx);
4211
4212         return NOTIFY_OK;
4213 }
4214
4215 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4216                                      struct cfg80211_bss *cbss)
4217 {
4218         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4219         const u8 *ht_cap_ie, *vht_cap_ie;
4220         const struct ieee80211_ht_cap *ht_cap;
4221         const struct ieee80211_vht_cap *vht_cap;
4222         u8 chains = 1;
4223
4224         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4225                 return chains;
4226
4227         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4228         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4229                 ht_cap = (void *)(ht_cap_ie + 2);
4230                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4231                 /*
4232                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4233                  *       "Tx Unequal Modulation Supported" fields.
4234                  */
4235         }
4236
4237         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4238                 return chains;
4239
4240         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4241         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4242                 u8 nss;
4243                 u16 tx_mcs_map;
4244
4245                 vht_cap = (void *)(vht_cap_ie + 2);
4246                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4247                 for (nss = 8; nss > 0; nss--) {
4248                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4249                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4250                                 break;
4251                 }
4252                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4253                 chains = max(chains, nss);
4254         }
4255
4256         return chains;
4257 }
4258
4259 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4260                                   struct cfg80211_bss *cbss)
4261 {
4262         struct ieee80211_local *local = sdata->local;
4263         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4264         const struct ieee80211_ht_cap *ht_cap = NULL;
4265         const struct ieee80211_ht_operation *ht_oper = NULL;
4266         const struct ieee80211_vht_operation *vht_oper = NULL;
4267         struct ieee80211_supported_band *sband;
4268         struct cfg80211_chan_def chandef;
4269         int ret;
4270         u32 i;
4271         bool have_80mhz;
4272
4273         sband = local->hw.wiphy->bands[cbss->channel->band];
4274
4275         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4276                           IEEE80211_STA_DISABLE_80P80MHZ |
4277                           IEEE80211_STA_DISABLE_160MHZ);
4278
4279         rcu_read_lock();
4280
4281         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4282             sband->ht_cap.ht_supported) {
4283                 const u8 *ht_oper_ie, *ht_cap_ie;
4284
4285                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4286                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4287                         ht_oper = (void *)(ht_oper_ie + 2);
4288
4289                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4290                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4291                         ht_cap = (void *)(ht_cap_ie + 2);
4292
4293                 if (!ht_cap) {
4294                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4295                         ht_oper = NULL;
4296                 }
4297         }
4298
4299         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4300             sband->vht_cap.vht_supported) {
4301                 const u8 *vht_oper_ie, *vht_cap;
4302
4303                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4304                                                    WLAN_EID_VHT_OPERATION);
4305                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4306                         vht_oper = (void *)(vht_oper_ie + 2);
4307                 if (vht_oper && !ht_oper) {
4308                         vht_oper = NULL;
4309                         sdata_info(sdata,
4310                                    "AP advertised VHT without HT, disabling both\n");
4311                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4312                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4313                 }
4314
4315                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4316                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4317                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4318                         vht_oper = NULL;
4319                 }
4320         }
4321
4322         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4323         have_80mhz = false;
4324         for (i = 0; i < sband->n_channels; i++) {
4325                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4326                                                 IEEE80211_CHAN_NO_80MHZ))
4327                         continue;
4328
4329                 have_80mhz = true;
4330                 break;
4331         }
4332
4333         if (!have_80mhz)
4334                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4335
4336         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4337                                                      cbss->channel,
4338                                                      ht_cap, ht_oper, vht_oper,
4339                                                      &chandef, false);
4340
4341         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4342                                       local->rx_chains);
4343
4344         rcu_read_unlock();
4345
4346         /* will change later if needed */
4347         sdata->smps_mode = IEEE80211_SMPS_OFF;
4348
4349         mutex_lock(&local->mtx);
4350         /*
4351          * If this fails (possibly due to channel context sharing
4352          * on incompatible channels, e.g. 80+80 and 160 sharing the
4353          * same control channel) try to use a smaller bandwidth.
4354          */
4355         ret = ieee80211_vif_use_channel(sdata, &chandef,
4356                                         IEEE80211_CHANCTX_SHARED);
4357
4358         /* don't downgrade for 5 and 10 MHz channels, though. */
4359         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4360             chandef.width == NL80211_CHAN_WIDTH_10)
4361                 goto out;
4362
4363         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4364                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4365                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4366                                                 IEEE80211_CHANCTX_SHARED);
4367         }
4368  out:
4369         mutex_unlock(&local->mtx);
4370         return ret;
4371 }
4372
4373 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4374                                      struct cfg80211_bss *cbss, bool assoc,
4375                                      bool override)
4376 {
4377         struct ieee80211_local *local = sdata->local;
4378         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4379         struct ieee80211_bss *bss = (void *)cbss->priv;
4380         struct sta_info *new_sta = NULL;
4381         struct ieee80211_supported_band *sband;
4382         bool have_sta = false;
4383         int err;
4384
4385         sband = local->hw.wiphy->bands[cbss->channel->band];
4386
4387         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4388                 return -EINVAL;
4389
4390         if (assoc) {
4391                 rcu_read_lock();
4392                 have_sta = sta_info_get(sdata, cbss->bssid);
4393                 rcu_read_unlock();
4394         }
4395
4396         if (!have_sta) {
4397                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4398                 if (!new_sta)
4399                         return -ENOMEM;
4400         }
4401
4402         if (new_sta || override) {
4403                 err = ieee80211_prep_channel(sdata, cbss);
4404                 if (err) {
4405                         if (new_sta)
4406                                 sta_info_free(local, new_sta);
4407                         return -EINVAL;
4408                 }
4409         }
4410
4411         if (new_sta) {
4412                 u32 rates = 0, basic_rates = 0;
4413                 bool have_higher_than_11mbit;
4414                 int min_rate = INT_MAX, min_rate_index = -1;
4415                 struct ieee80211_chanctx_conf *chanctx_conf;
4416                 const struct cfg80211_bss_ies *ies;
4417                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4418                 u32 rate_flags;
4419
4420                 rcu_read_lock();
4421                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4422                 if (WARN_ON(!chanctx_conf)) {
4423                         rcu_read_unlock();
4424                         sta_info_free(local, new_sta);
4425                         return -EINVAL;
4426                 }
4427                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4428                 rcu_read_unlock();
4429
4430                 ieee80211_get_rates(sband, bss->supp_rates,
4431                                     bss->supp_rates_len,
4432                                     &rates, &basic_rates,
4433                                     &have_higher_than_11mbit,
4434                                     &min_rate, &min_rate_index,
4435                                     shift, rate_flags);
4436
4437                 /*
4438                  * This used to be a workaround for basic rates missing
4439                  * in the association response frame. Now that we no
4440                  * longer use the basic rates from there, it probably
4441                  * doesn't happen any more, but keep the workaround so
4442                  * in case some *other* APs are buggy in different ways
4443                  * we can connect -- with a warning.
4444                  */
4445                 if (!basic_rates && min_rate_index >= 0) {
4446                         sdata_info(sdata,
4447                                    "No basic rates, using min rate instead\n");
4448                         basic_rates = BIT(min_rate_index);
4449                 }
4450
4451                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4452                 sdata->vif.bss_conf.basic_rates = basic_rates;
4453
4454                 /* cf. IEEE 802.11 9.2.12 */
4455                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4456                     have_higher_than_11mbit)
4457                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4458                 else
4459                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4460
4461                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4462
4463                 /* set timing information */
4464                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4465                 rcu_read_lock();
4466                 ies = rcu_dereference(cbss->beacon_ies);
4467                 if (ies) {
4468                         const u8 *tim_ie;
4469
4470                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4471                         sdata->vif.bss_conf.sync_device_ts =
4472                                 bss->device_ts_beacon;
4473                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4474                                                   ies->data, ies->len);
4475                         if (tim_ie && tim_ie[1] >= 2)
4476                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4477                         else
4478                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4479                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4480                                                TIMING_BEACON_ONLY)) {
4481                         ies = rcu_dereference(cbss->proberesp_ies);
4482                         /* must be non-NULL since beacon IEs were NULL */
4483                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4484                         sdata->vif.bss_conf.sync_device_ts =
4485                                 bss->device_ts_presp;
4486                         sdata->vif.bss_conf.sync_dtim_count = 0;
4487                 } else {
4488                         sdata->vif.bss_conf.sync_tsf = 0;
4489                         sdata->vif.bss_conf.sync_device_ts = 0;
4490                         sdata->vif.bss_conf.sync_dtim_count = 0;
4491                 }
4492                 rcu_read_unlock();
4493
4494                 /* tell driver about BSSID, basic rates and timing */
4495                 ieee80211_bss_info_change_notify(sdata,
4496                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4497                         BSS_CHANGED_BEACON_INT);
4498
4499                 if (assoc)
4500                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4501
4502                 err = sta_info_insert(new_sta);
4503                 new_sta = NULL;
4504                 if (err) {
4505                         sdata_info(sdata,
4506                                    "failed to insert STA entry for the AP (error %d)\n",
4507                                    err);
4508                         return err;
4509                 }
4510         } else
4511                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4512
4513         /* Cancel scan to ensure that nothing interferes with connection */
4514         if (local->scanning)
4515                 ieee80211_scan_cancel(local);
4516
4517         return 0;
4518 }
4519
4520 /* config hooks */
4521 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4522                        struct cfg80211_auth_request *req)
4523 {
4524         struct ieee80211_local *local = sdata->local;
4525         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4526         struct ieee80211_mgd_auth_data *auth_data;
4527         u16 auth_alg;
4528         int err;
4529
4530         /* prepare auth data structure */
4531
4532         switch (req->auth_type) {
4533         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4534                 auth_alg = WLAN_AUTH_OPEN;
4535                 break;
4536         case NL80211_AUTHTYPE_SHARED_KEY:
4537                 if (IS_ERR(local->wep_tx_tfm))
4538                         return -EOPNOTSUPP;
4539                 auth_alg = WLAN_AUTH_SHARED_KEY;
4540                 break;
4541         case NL80211_AUTHTYPE_FT:
4542                 auth_alg = WLAN_AUTH_FT;
4543                 break;
4544         case NL80211_AUTHTYPE_NETWORK_EAP:
4545                 auth_alg = WLAN_AUTH_LEAP;
4546                 break;
4547         case NL80211_AUTHTYPE_SAE:
4548                 auth_alg = WLAN_AUTH_SAE;
4549                 break;
4550         default:
4551                 return -EOPNOTSUPP;
4552         }
4553
4554         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4555                             req->ie_len, GFP_KERNEL);
4556         if (!auth_data)
4557                 return -ENOMEM;
4558
4559         auth_data->bss = req->bss;
4560
4561         if (req->sae_data_len >= 4) {
4562                 __le16 *pos = (__le16 *) req->sae_data;
4563                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4564                 auth_data->sae_status = le16_to_cpu(pos[1]);
4565                 memcpy(auth_data->data, req->sae_data + 4,
4566                        req->sae_data_len - 4);
4567                 auth_data->data_len += req->sae_data_len - 4;
4568         }
4569
4570         if (req->ie && req->ie_len) {
4571                 memcpy(&auth_data->data[auth_data->data_len],
4572                        req->ie, req->ie_len);
4573                 auth_data->data_len += req->ie_len;
4574         }
4575
4576         if (req->key && req->key_len) {
4577                 auth_data->key_len = req->key_len;
4578                 auth_data->key_idx = req->key_idx;
4579                 memcpy(auth_data->key, req->key, req->key_len);
4580         }
4581
4582         auth_data->algorithm = auth_alg;
4583
4584         /* try to authenticate/probe */
4585
4586         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4587             ifmgd->assoc_data) {
4588                 err = -EBUSY;
4589                 goto err_free;
4590         }
4591
4592         if (ifmgd->auth_data)
4593                 ieee80211_destroy_auth_data(sdata, false);
4594
4595         /* prep auth_data so we don't go into idle on disassoc */
4596         ifmgd->auth_data = auth_data;
4597
4598         if (ifmgd->associated) {
4599                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4600
4601                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4602                                        WLAN_REASON_UNSPECIFIED,
4603                                        false, frame_buf);
4604
4605                 ieee80211_report_disconnect(sdata, frame_buf,
4606                                             sizeof(frame_buf), true,
4607                                             WLAN_REASON_UNSPECIFIED);
4608         }
4609
4610         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4611
4612         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4613         if (err)
4614                 goto err_clear;
4615
4616         err = ieee80211_probe_auth(sdata);
4617         if (err) {
4618                 sta_info_destroy_addr(sdata, req->bss->bssid);
4619                 goto err_clear;
4620         }
4621
4622         /* hold our own reference */
4623         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4624         return 0;
4625
4626  err_clear:
4627         eth_zero_addr(ifmgd->bssid);
4628         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4629         ifmgd->auth_data = NULL;
4630         mutex_lock(&sdata->local->mtx);
4631         ieee80211_vif_release_channel(sdata);
4632         mutex_unlock(&sdata->local->mtx);
4633  err_free:
4634         kfree(auth_data);
4635         return err;
4636 }
4637
4638 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4639                                         const u8 *wmm_param, int len)
4640 {
4641         const u8 *pos;
4642         size_t left;
4643
4644         if (len < 8)
4645                 return false;
4646
4647         if (wmm_param[5] != 1 /* version */)
4648                 return false;
4649
4650         pos = wmm_param + 8;
4651         left = len - 8;
4652
4653         for (; left >= 4; left -= 4, pos += 4) {
4654                 u8 aifsn = pos[0] & 0x0f;
4655                 u8 ecwmin = pos[1] & 0x0f;
4656                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4657                 int aci = (pos[0] >> 5) & 0x03;
4658
4659                 if (aifsn < 2) {
4660                         sdata_info(sdata,
4661                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4662                                    aifsn, aci);
4663                         return false;
4664                 }
4665                 if (ecwmin > ecwmax) {
4666                         sdata_info(sdata,
4667                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4668                                    ecwmin, ecwmax, aci);
4669                         return false;
4670                 }
4671         }
4672
4673         return true;
4674 }
4675
4676 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4677                         struct cfg80211_assoc_request *req)
4678 {
4679         struct ieee80211_local *local = sdata->local;
4680         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4681         struct ieee80211_bss *bss = (void *)req->bss->priv;
4682         struct ieee80211_mgd_assoc_data *assoc_data;
4683         const struct cfg80211_bss_ies *beacon_ies;
4684         struct ieee80211_supported_band *sband;
4685         const u8 *ssidie, *ht_ie, *vht_ie;
4686         int i, err;
4687         bool override = false;
4688
4689         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4690         if (!assoc_data)
4691                 return -ENOMEM;
4692
4693         rcu_read_lock();
4694         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4695         if (!ssidie) {
4696                 rcu_read_unlock();
4697                 kfree(assoc_data);
4698                 return -EINVAL;
4699         }
4700         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4701         assoc_data->ssid_len = ssidie[1];
4702         rcu_read_unlock();
4703
4704         if (ifmgd->associated) {
4705                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4706
4707                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4708                                        WLAN_REASON_UNSPECIFIED,
4709                                        false, frame_buf);
4710
4711                 ieee80211_report_disconnect(sdata, frame_buf,
4712                                             sizeof(frame_buf), true,
4713                                             WLAN_REASON_UNSPECIFIED);
4714         }
4715
4716         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4717                 err = -EBUSY;
4718                 goto err_free;
4719         }
4720
4721         if (ifmgd->assoc_data) {
4722                 err = -EBUSY;
4723                 goto err_free;
4724         }
4725
4726         if (ifmgd->auth_data) {
4727                 bool match;
4728
4729                 /* keep sta info, bssid if matching */
4730                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4731                 ieee80211_destroy_auth_data(sdata, match);
4732         }
4733
4734         /* prepare assoc data */
4735
4736         ifmgd->beacon_crc_valid = false;
4737
4738         assoc_data->wmm = bss->wmm_used &&
4739                           (local->hw.queues >= IEEE80211_NUM_ACS);
4740         if (assoc_data->wmm) {
4741                 /* try to check validity of WMM params IE */
4742                 const struct cfg80211_bss_ies *ies;
4743                 const u8 *wp, *start, *end;
4744
4745                 rcu_read_lock();
4746                 ies = rcu_dereference(req->bss->ies);
4747                 start = ies->data;
4748                 end = start + ies->len;
4749
4750                 while (true) {
4751                         wp = cfg80211_find_vendor_ie(
4752                                 WLAN_OUI_MICROSOFT,
4753                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4754                                 start, end - start);
4755                         if (!wp)
4756                                 break;
4757                         start = wp + wp[1] + 2;
4758                         /* if this IE is too short, try the next */
4759                         if (wp[1] <= 4)
4760                                 continue;
4761                         /* if this IE is WMM params, we found what we wanted */
4762                         if (wp[6] == 1)
4763                                 break;
4764                 }
4765
4766                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4767                                                         wp[1] - 2)) {
4768                         assoc_data->wmm = false;
4769                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4770                 }
4771                 rcu_read_unlock();
4772         }
4773
4774         /*
4775          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4776          * We still associate in non-HT mode (11a/b/g) if any one of these
4777          * ciphers is configured as pairwise.
4778          * We can set this to true for non-11n hardware, that'll be checked
4779          * separately along with the peer capabilities.
4780          */
4781         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4782                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4783                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4784                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4785                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4786                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4787                         netdev_info(sdata->dev,
4788                                     "disabling HT/VHT due to WEP/TKIP use\n");
4789                 }
4790         }
4791
4792         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4793         sband = local->hw.wiphy->bands[req->bss->channel->band];
4794         if (!sband->ht_cap.ht_supported ||
4795             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4796             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4797                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4798                 if (!bss->wmm_used &&
4799                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4800                         netdev_info(sdata->dev,
4801                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4802         }
4803
4804         /* disable VHT if we don't support it or the AP doesn't use WMM */
4805         if (!sband->vht_cap.vht_supported ||
4806             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4807             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4808                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4809                 if (!bss->wmm_used &&
4810                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4811                         netdev_info(sdata->dev,
4812                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4813         }
4814
4815         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4816         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4817                sizeof(ifmgd->ht_capa_mask));
4818
4819         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4820         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4821                sizeof(ifmgd->vht_capa_mask));
4822
4823         if (req->ie && req->ie_len) {
4824                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4825                 assoc_data->ie_len = req->ie_len;
4826         }
4827
4828         assoc_data->bss = req->bss;
4829
4830         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4831                 if (ifmgd->powersave)
4832                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4833                 else
4834                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4835         } else
4836                 sdata->smps_mode = ifmgd->req_smps;
4837
4838         assoc_data->capability = req->bss->capability;
4839         assoc_data->supp_rates = bss->supp_rates;
4840         assoc_data->supp_rates_len = bss->supp_rates_len;
4841
4842         rcu_read_lock();
4843         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4844         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4845                 assoc_data->ap_ht_param =
4846                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4847         else
4848                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4849         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4850         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4851                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4852                        sizeof(struct ieee80211_vht_cap));
4853         else
4854                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4855         rcu_read_unlock();
4856
4857         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4858                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4859              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4860                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4861
4862         if (bss->wmm_used && bss->uapsd_supported &&
4863             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4864                 assoc_data->uapsd = true;
4865                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4866         } else {
4867                 assoc_data->uapsd = false;
4868                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4869         }
4870
4871         if (req->prev_bssid)
4872                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4873
4874         if (req->use_mfp) {
4875                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4876                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4877         } else {
4878                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4879                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4880         }
4881
4882         if (req->flags & ASSOC_REQ_USE_RRM)
4883                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4884         else
4885                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4886
4887         if (req->crypto.control_port)
4888                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4889         else
4890                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4891
4892         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4893         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4894         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4895                                                         sdata->vif.type);
4896
4897         /* kick off associate process */
4898
4899         ifmgd->assoc_data = assoc_data;
4900         ifmgd->dtim_period = 0;
4901         ifmgd->have_beacon = false;
4902
4903         /* override HT/VHT configuration only if the AP and we support it */
4904         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4905                 struct ieee80211_sta_ht_cap sta_ht_cap;
4906
4907                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4908                         override = true;
4909
4910                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4911                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4912
4913                 /* check for 40 MHz disable override */
4914                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4915                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4916                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4917                         override = true;
4918
4919                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4920                     req->flags & ASSOC_REQ_DISABLE_VHT)
4921                         override = true;
4922         }
4923
4924         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4925                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4926                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4927         }
4928
4929         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4930                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4931
4932         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4933         if (err)
4934                 goto err_clear;
4935
4936         rcu_read_lock();
4937         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4938
4939         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4940             !beacon_ies) {
4941                 /*
4942                  * Wait up to one beacon interval ...
4943                  * should this be more if we miss one?
4944                  */
4945                 sdata_info(sdata, "waiting for beacon from %pM\n",
4946                            ifmgd->bssid);
4947                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4948                 assoc_data->timeout_started = true;
4949                 assoc_data->need_beacon = true;
4950         } else if (beacon_ies) {
4951                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4952                                                     beacon_ies->data,
4953                                                     beacon_ies->len);
4954                 u8 dtim_count = 0;
4955
4956                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4957                         const struct ieee80211_tim_ie *tim;
4958                         tim = (void *)(tim_ie + 2);
4959                         ifmgd->dtim_period = tim->dtim_period;
4960                         dtim_count = tim->dtim_count;
4961                 }
4962                 ifmgd->have_beacon = true;
4963                 assoc_data->timeout = jiffies;
4964                 assoc_data->timeout_started = true;
4965
4966                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4967                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4968                         sdata->vif.bss_conf.sync_device_ts =
4969                                 bss->device_ts_beacon;
4970                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4971                 }
4972         } else {
4973                 assoc_data->timeout = jiffies;
4974                 assoc_data->timeout_started = true;
4975         }
4976         rcu_read_unlock();
4977
4978         run_again(sdata, assoc_data->timeout);
4979
4980         if (bss->corrupt_data) {
4981                 char *corrupt_type = "data";
4982                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4983                         if (bss->corrupt_data &
4984                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4985                                 corrupt_type = "beacon and probe response";
4986                         else
4987                                 corrupt_type = "beacon";
4988                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4989                         corrupt_type = "probe response";
4990                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4991                            corrupt_type);
4992         }
4993
4994         return 0;
4995  err_clear:
4996         eth_zero_addr(ifmgd->bssid);
4997         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4998         ifmgd->assoc_data = NULL;
4999  err_free:
5000         kfree(assoc_data);
5001         return err;
5002 }
5003
5004 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
5005                          struct cfg80211_deauth_request *req)
5006 {
5007         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5008         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5009         bool tx = !req->local_state_change;
5010
5011         if (ifmgd->auth_data &&
5012             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
5013                 sdata_info(sdata,
5014                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
5015                            req->bssid, req->reason_code,
5016                            ieee80211_get_reason_code_string(req->reason_code));
5017
5018                 drv_mgd_prepare_tx(sdata->local, sdata);
5019                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
5020                                                IEEE80211_STYPE_DEAUTH,
5021                                                req->reason_code, tx,
5022                                                frame_buf);
5023                 ieee80211_destroy_auth_data(sdata, false);
5024                 ieee80211_report_disconnect(sdata, frame_buf,
5025                                             sizeof(frame_buf), true,
5026                                             req->reason_code);
5027
5028                 return 0;
5029         }
5030
5031         if (ifmgd->associated &&
5032             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5033                 sdata_info(sdata,
5034                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
5035                            req->bssid, req->reason_code,
5036                            ieee80211_get_reason_code_string(req->reason_code));
5037
5038                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5039                                        req->reason_code, tx, frame_buf);
5040                 ieee80211_report_disconnect(sdata, frame_buf,
5041                                             sizeof(frame_buf), true,
5042                                             req->reason_code);
5043                 return 0;
5044         }
5045
5046         return -ENOTCONN;
5047 }
5048
5049 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5050                            struct cfg80211_disassoc_request *req)
5051 {
5052         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5053         u8 bssid[ETH_ALEN];
5054         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5055
5056         /*
5057          * cfg80211 should catch this ... but it's racy since
5058          * we can receive a disassoc frame, process it, hand it
5059          * to cfg80211 while that's in a locked section already
5060          * trying to tell us that the user wants to disconnect.
5061          */
5062         if (ifmgd->associated != req->bss)
5063                 return -ENOLINK;
5064
5065         sdata_info(sdata,
5066                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5067                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5068
5069         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5070         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5071                                req->reason_code, !req->local_state_change,
5072                                frame_buf);
5073
5074         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5075                                     req->reason_code);
5076
5077         return 0;
5078 }
5079
5080 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5081 {
5082         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5083
5084         /*
5085          * Make sure some work items will not run after this,
5086          * they will not do anything but might not have been
5087          * cancelled when disconnecting.
5088          */
5089         cancel_work_sync(&ifmgd->monitor_work);
5090         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5091         cancel_work_sync(&ifmgd->request_smps_work);
5092         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5093         cancel_work_sync(&ifmgd->chswitch_work);
5094         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5095
5096         sdata_lock(sdata);
5097         if (ifmgd->assoc_data) {
5098                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5099                 ieee80211_destroy_assoc_data(sdata, false);
5100                 cfg80211_assoc_timeout(sdata->dev, bss);
5101         }
5102         if (ifmgd->auth_data)
5103                 ieee80211_destroy_auth_data(sdata, false);
5104         spin_lock_bh(&ifmgd->teardown_lock);
5105         if (ifmgd->teardown_skb) {
5106                 kfree_skb(ifmgd->teardown_skb);
5107                 ifmgd->teardown_skb = NULL;
5108                 ifmgd->orig_teardown_skb = NULL;
5109         }
5110         spin_unlock_bh(&ifmgd->teardown_lock);
5111         del_timer_sync(&ifmgd->timer);
5112         sdata_unlock(sdata);
5113 }
5114
5115 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5116                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5117                                gfp_t gfp)
5118 {
5119         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5120
5121         trace_api_cqm_rssi_notify(sdata, rssi_event);
5122
5123         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5124 }
5125 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5126
5127 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5128 {
5129         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5130
5131         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5132
5133         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5134 }
5135 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);