net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  * Copyright (C) 2015 Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33
  34 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  35 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  36 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  37 #define IEEE80211_AUTH_MAX_TRIES        3
  38 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  39 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  40 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  41 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  42 #define IEEE80211_ASSOC_MAX_TRIES       3
  43
  44 static int max_nullfunc_tries = 2;
  45 module_param(max_nullfunc_tries, int, 0644);
  46 MODULE_PARM_DESC(max_nullfunc_tries,
  47                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  48
  49 static int max_probe_tries = 5;
  50 module_param(max_probe_tries, int, 0644);
  51 MODULE_PARM_DESC(max_probe_tries,
  52                  "Maximum probe tries before disconnecting (reason 4).");
  53
  54 /*
  55  * Beacon loss timeout is calculated as N frames times the
  56  * advertised beacon interval.  This may need to be somewhat
  57  * higher than what hardware might detect to account for
  58  * delays in the host processing frames. But since we also
  59  * probe on beacon miss before declaring the connection lost
  60  * default to what we want.
  61  */
  62 static int beacon_loss_count = 7;
  63 module_param(beacon_loss_count, int, 0644);
  64 MODULE_PARM_DESC(beacon_loss_count,
  65                  "Number of beacon intervals before we decide beacon was lost.");
  66
  67 /*
  68  * Time the connection can be idle before we probe
  69  * it to see if we can still talk to the AP.
  70  */
  71 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  72 /*
  73  * Time we wait for a probe response after sending
  74  * a probe request because of beacon loss or for
  75  * checking the connection still works.
  76  */
  77 static int probe_wait_ms = 500;
  78 module_param(probe_wait_ms, int, 0644);
  79 MODULE_PARM_DESC(probe_wait_ms,
  80                  "Maximum time(ms) to wait for probe response"
  81                  " before disconnecting (reason 4).");
  82
  83 /*
  84  * How many Beacon frames need to have been used in average signal strength
  85  * before starting to indicate signal change events.
  86  */
  87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  88
  89 /*
  90  * We can have multiple work items (and connection probing)
  91  * scheduling this timer, but we need to take care to only
  92  * reschedule it when it should fire _earlier_ than it was
  93  * asked for before, or if it's not pending right now. This
  94  * function ensures that. Note that it then is required to
  95  * run this function for all timeouts after the first one
  96  * has happened -- the work that runs from this timer will
  97  * do that.
  98  */
  99 static void run_again(struct ieee80211_sub_if_data *sdata,
 100                       unsigned long timeout)
 101 {
 102         sdata_assert_lock(sdata);
 103
 104         if (!timer_pending(&sdata->u.mgd.timer) ||
 105             time_before(timeout, sdata->u.mgd.timer.expires))
 106                 mod_timer(&sdata->u.mgd.timer, timeout);
 107 }
 108
 109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 110 {
 111         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 112                 return;
 113
 114         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 119 }
 120
 121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 122 {
 123         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 124
 125         if (unlikely(!sdata->u.mgd.associated))
 126                 return;
 127
 128         ifmgd->probe_send_count = 0;
 129
 130         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 131                 return;
 132
 133         mod_timer(&sdata->u.mgd.conn_mon_timer,
 134                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 135 }
 136
 137 static int ecw2cw(int ecw)
 138 {
 139         return (1 << ecw) - 1;
 140 }
 141
 142 static u32
 143 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 144                              struct ieee80211_supported_band *sband,
 145                              struct ieee80211_channel *channel,
 146                              const struct ieee80211_ht_cap *ht_cap,
 147                              const struct ieee80211_ht_operation *ht_oper,
 148                              const struct ieee80211_vht_operation *vht_oper,
 149                              struct cfg80211_chan_def *chandef, bool tracking)
 150 {
 151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 152         struct cfg80211_chan_def vht_chandef;
 153         struct ieee80211_sta_ht_cap sta_ht_cap;
 154         u32 ht_cfreq, ret;
 155
 156         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 157         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 158
 159         chandef->chan = channel;
 160         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 161         chandef->center_freq1 = channel->center_freq;
 162         chandef->center_freq2 = 0;
 163
 164         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 165                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 166                 goto out;
 167         }
 168
 169         chandef->width = NL80211_CHAN_WIDTH_20;
 170
 171         if (!(ht_cap->cap_info &
 172               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 173                 ret = IEEE80211_STA_DISABLE_40MHZ;
 174                 vht_chandef = *chandef;
 175                 goto out;
 176         }
 177
 178         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 179                                                   channel->band);
 180         /* check that channel matches the right operating channel */
 181         if (!tracking && channel->center_freq != ht_cfreq) {
 182                 /*
 183                  * It's possible that some APs are confused here;
 184                  * Netgear WNDR3700 sometimes reports 4 higher than
 185                  * the actual channel in association responses, but
 186                  * since we look at probe response/beacon data here
 187                  * it should be OK.
 188                  */
 189                 sdata_info(sdata,
 190                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 191                            channel->center_freq, ht_cfreq,
 192                            ht_oper->primary_chan, channel->band);
 193                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 194                 goto out;
 195         }
 196
 197         /* check 40 MHz support, if we have it */
 198         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 199                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 200                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 201                         chandef->width = NL80211_CHAN_WIDTH_40;
 202                         chandef->center_freq1 += 10;
 203                         break;
 204                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 205                         chandef->width = NL80211_CHAN_WIDTH_40;
 206                         chandef->center_freq1 -= 10;
 207                         break;
 208                 }
 209         } else {
 210                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 211                 ret = IEEE80211_STA_DISABLE_VHT;
 212                 /* also mark 40 MHz disabled */
 213                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 214                 goto out;
 215         }
 216
 217         if (!vht_oper || !sband->vht_cap.vht_supported) {
 218                 ret = IEEE80211_STA_DISABLE_VHT;
 219                 goto out;
 220         }
 221
 222         vht_chandef.chan = channel;
 223         vht_chandef.center_freq1 =
 224                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 225                                                channel->band);
 226         vht_chandef.center_freq2 = 0;
 227
 228         switch (vht_oper->chan_width) {
 229         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 230                 vht_chandef.width = chandef->width;
 231                 vht_chandef.center_freq1 = chandef->center_freq1;
 232                 break;
 233         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 234                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 235                 break;
 236         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 237                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 238                 break;
 239         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 240                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 241                 vht_chandef.center_freq2 =
 242                         ieee80211_channel_to_frequency(
 243                                 vht_oper->center_freq_seg2_idx,
 244                                 channel->band);
 245                 break;
 246         default:
 247                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 248                         sdata_info(sdata,
 249                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 250                                    vht_oper->chan_width);
 251                 ret = IEEE80211_STA_DISABLE_VHT;
 252                 goto out;
 253         }
 254
 255         if (!cfg80211_chandef_valid(&vht_chandef)) {
 256                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 257                         sdata_info(sdata,
 258                                    "AP VHT information is invalid, disable VHT\n");
 259                 ret = IEEE80211_STA_DISABLE_VHT;
 260                 goto out;
 261         }
 262
 263         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 264                 ret = 0;
 265                 goto out;
 266         }
 267
 268         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 269                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 270                         sdata_info(sdata,
 271                                    "AP VHT information doesn't match HT, disable VHT\n");
 272                 ret = IEEE80211_STA_DISABLE_VHT;
 273                 goto out;
 274         }
 275
 276         *chandef = vht_chandef;
 277
 278         ret = 0;
 279
 280 out:
 281         /*
 282          * When tracking the current AP, don't do any further checks if the
 283          * new chandef is identical to the one we're currently using for the
 284          * connection. This keeps us from playing ping-pong with regulatory,
 285          * without it the following can happen (for example):
 286          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 287          *  - AP advertises regdom US
 288          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 289          *  - the code below detects an unsupported channel, downgrades, and
 290          *    we disconnect from the AP in the caller
 291          *  - disconnect causes CRDA to reload world regdomain and the game
 292          *    starts anew.
 293          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 294          *
 295          * It seems possible that there are still scenarios with CSA or real
 296          * bandwidth changes where a this could happen, but those cases are
 297          * less common and wouldn't completely prevent using the AP.
 298          */
 299         if (tracking &&
 300             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 301                 return ret;
 302
 303         /* don't print the message below for VHT mismatch if VHT is disabled */
 304         if (ret & IEEE80211_STA_DISABLE_VHT)
 305                 vht_chandef = *chandef;
 306
 307         /*
 308          * Ignore the DISABLED flag when we're already connected and only
 309          * tracking the APs beacon for bandwidth changes - otherwise we
 310          * might get disconnected here if we connect to an AP, update our
 311          * regulatory information based on the AP's country IE and the
 312          * information we have is wrong/outdated and disables the channel
 313          * that we're actually using for the connection to the AP.
 314          */
 315         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 316                                         tracking ? 0 :
 317                                                    IEEE80211_CHAN_DISABLED)) {
 318                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 319                         ret = IEEE80211_STA_DISABLE_HT |
 320                               IEEE80211_STA_DISABLE_VHT;
 321                         break;
 322                 }
 323
 324                 ret |= ieee80211_chandef_downgrade(chandef);
 325         }
 326
 327         if (chandef->width != vht_chandef.width && !tracking)
 328                 sdata_info(sdata,
 329                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 330
 331         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 332         return ret;
 333 }
 334
 335 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 336                                struct sta_info *sta,
 337                                const struct ieee80211_ht_cap *ht_cap,
 338                                const struct ieee80211_ht_operation *ht_oper,
 339                                const struct ieee80211_vht_operation *vht_oper,
 340                                const u8 *bssid, u32 *changed)
 341 {
 342         struct ieee80211_local *local = sdata->local;
 343         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 344         struct ieee80211_supported_band *sband;
 345         struct ieee80211_channel *chan;
 346         struct cfg80211_chan_def chandef;
 347         u16 ht_opmode;
 348         u32 flags;
 349         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 350         int ret;
 351
 352         /* if HT was/is disabled, don't track any bandwidth changes */
 353         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 354                 return 0;
 355
 356         /* don't check VHT if we associated as non-VHT station */
 357         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 358                 vht_oper = NULL;
 359
 360         if (WARN_ON_ONCE(!sta))
 361                 return -EINVAL;
 362
 363         /*
 364          * if bss configuration changed store the new one -
 365          * this may be applicable even if channel is identical
 366          */
 367         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 368         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 369                 *changed |= BSS_CHANGED_HT;
 370                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 371         }
 372
 373         chan = sdata->vif.bss_conf.chandef.chan;
 374         sband = local->hw.wiphy->bands[chan->band];
 375
 376         /* calculate new channel (type) based on HT/VHT operation IEs */
 377         flags = ieee80211_determine_chantype(sdata, sband, chan,
 378                                              ht_cap, ht_oper, vht_oper,
 379                                              &chandef, true);
 380
 381         /*
 382          * Downgrade the new channel if we associated with restricted
 383          * capabilities. For example, if we associated as a 20 MHz STA
 384          * to a 40 MHz AP (due to regulatory, capabilities or config
 385          * reasons) then switching to a 40 MHz channel now won't do us
 386          * any good -- we couldn't use it with the AP.
 387          */
 388         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 389             chandef.width == NL80211_CHAN_WIDTH_80P80)
 390                 flags |= ieee80211_chandef_downgrade(&chandef);
 391         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 392             chandef.width == NL80211_CHAN_WIDTH_160)
 393                 flags |= ieee80211_chandef_downgrade(&chandef);
 394         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 395             chandef.width > NL80211_CHAN_WIDTH_20)
 396                 flags |= ieee80211_chandef_downgrade(&chandef);
 397
 398         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 399                 return 0;
 400
 401         sdata_info(sdata,
 402                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 403                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 404                    chandef.center_freq1, chandef.center_freq2);
 405
 406         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 407                                       IEEE80211_STA_DISABLE_VHT |
 408                                       IEEE80211_STA_DISABLE_40MHZ |
 409                                       IEEE80211_STA_DISABLE_80P80MHZ |
 410                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 411             !cfg80211_chandef_valid(&chandef)) {
 412                 sdata_info(sdata,
 413                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 414                            ifmgd->bssid);
 415                 return -EINVAL;
 416         }
 417
 418         switch (chandef.width) {
 419         case NL80211_CHAN_WIDTH_20_NOHT:
 420         case NL80211_CHAN_WIDTH_20:
 421                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 422                 break;
 423         case NL80211_CHAN_WIDTH_40:
 424                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 425                 break;
 426         case NL80211_CHAN_WIDTH_80:
 427                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 428                 break;
 429         case NL80211_CHAN_WIDTH_80P80:
 430         case NL80211_CHAN_WIDTH_160:
 431                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 432                 break;
 433         default:
 434                 return -EINVAL;
 435         }
 436
 437         if (new_sta_bw > sta->cur_max_bandwidth)
 438                 new_sta_bw = sta->cur_max_bandwidth;
 439
 440         if (new_sta_bw < sta->sta.bandwidth) {
 441                 sta->sta.bandwidth = new_sta_bw;
 442                 rate_control_rate_update(local, sband, sta,
 443                                          IEEE80211_RC_BW_CHANGED);
 444         }
 445
 446         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 447         if (ret) {
 448                 sdata_info(sdata,
 449                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 450                            ifmgd->bssid);
 451                 return ret;
 452         }
 453
 454         if (new_sta_bw > sta->sta.bandwidth) {
 455                 sta->sta.bandwidth = new_sta_bw;
 456                 rate_control_rate_update(local, sband, sta,
 457                                          IEEE80211_RC_BW_CHANGED);
 458         }
 459
 460         return 0;
 461 }
 462
 463 /* frame sending functions */
 464
 465 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 466                                 struct sk_buff *skb, u8 ap_ht_param,
 467                                 struct ieee80211_supported_band *sband,
 468                                 struct ieee80211_channel *channel,
 469                                 enum ieee80211_smps_mode smps)
 470 {
 471         u8 *pos;
 472         u32 flags = channel->flags;
 473         u16 cap;
 474         struct ieee80211_sta_ht_cap ht_cap;
 475
 476         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 477
 478         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 479         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 480
 481         /* determine capability flags */
 482         cap = ht_cap.cap;
 483
 484         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 485         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 486                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 487                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 488                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 489                 }
 490                 break;
 491         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 492                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 493                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 494                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 495                 }
 496                 break;
 497         }
 498
 499         /*
 500          * If 40 MHz was disabled associate as though we weren't
 501          * capable of 40 MHz -- some broken APs will never fall
 502          * back to trying to transmit in 20 MHz.
 503          */
 504         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 505                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 506                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 507         }
 508
 509         /* set SM PS mode properly */
 510         cap &= ~IEEE80211_HT_CAP_SM_PS;
 511         switch (smps) {
 512         case IEEE80211_SMPS_AUTOMATIC:
 513         case IEEE80211_SMPS_NUM_MODES:
 514                 WARN_ON(1);
 515         case IEEE80211_SMPS_OFF:
 516                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 517                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 518                 break;
 519         case IEEE80211_SMPS_STATIC:
 520                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 521                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 522                 break;
 523         case IEEE80211_SMPS_DYNAMIC:
 524                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 525                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 526                 break;
 527         }
 528
 529         /* reserve and fill IE */
 530         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 531         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 532 }
 533
 534 /* This function determines vht capability flags for the association
 535  * and builds the IE.
 536  * Note - the function may set the owner of the MU-MIMO capability
 537  */
 538 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 539                                  struct sk_buff *skb,
 540                                  struct ieee80211_supported_band *sband,
 541                                  struct ieee80211_vht_cap *ap_vht_cap)
 542 {
 543         struct ieee80211_local *local = sdata->local;
 544         u8 *pos;
 545         u32 cap;
 546         struct ieee80211_sta_vht_cap vht_cap;
 547         u32 mask, ap_bf_sts, our_bf_sts;
 548
 549         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 550
 551         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 552         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 553
 554         /* determine capability flags */
 555         cap = vht_cap.cap;
 556
 557         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 558                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 559
 560                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 561                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 562                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 563                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 564         }
 565
 566         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 567                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 568                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 569         }
 570
 571         /*
 572          * Some APs apparently get confused if our capabilities are better
 573          * than theirs, so restrict what we advertise in the assoc request.
 574          */
 575         if (!(ap_vht_cap->vht_cap_info &
 576                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 577                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 578                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 579         else if (!(ap_vht_cap->vht_cap_info &
 580                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 581                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 582
 583         /*
 584          * If some other vif is using the MU-MIMO capablity we cannot associate
 585          * using MU-MIMO - this will lead to contradictions in the group-id
 586          * mechanism.
 587          * Ownership is defined since association request, in order to avoid
 588          * simultaneous associations with MU-MIMO.
 589          */
 590         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 591                 bool disable_mu_mimo = false;
 592                 struct ieee80211_sub_if_data *other;
 593
 594                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 595                         if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
 596                                 disable_mu_mimo = true;
 597                                 break;
 598                         }
 599                 }
 600                 if (disable_mu_mimo)
 601                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 602                 else
 603                         sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
 604         }
 605
 606         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 607
 608         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 609         our_bf_sts = cap & mask;
 610
 611         if (ap_bf_sts < our_bf_sts) {
 612                 cap &= ~mask;
 613                 cap |= ap_bf_sts;
 614         }
 615
 616         /* reserve and fill IE */
 617         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 618         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 619 }
 620
 621 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 622 {
 623         struct ieee80211_local *local = sdata->local;
 624         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 625         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 626         struct sk_buff *skb;
 627         struct ieee80211_mgmt *mgmt;
 628         u8 *pos, qos_info;
 629         size_t offset = 0, noffset;
 630         int i, count, rates_len, supp_rates_len, shift;
 631         u16 capab;
 632         struct ieee80211_supported_band *sband;
 633         struct ieee80211_chanctx_conf *chanctx_conf;
 634         struct ieee80211_channel *chan;
 635         u32 rate_flags, rates = 0;
 636
 637         sdata_assert_lock(sdata);
 638
 639         rcu_read_lock();
 640         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 641         if (WARN_ON(!chanctx_conf)) {
 642                 rcu_read_unlock();
 643                 return;
 644         }
 645         chan = chanctx_conf->def.chan;
 646         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 647         rcu_read_unlock();
 648         sband = local->hw.wiphy->bands[chan->band];
 649         shift = ieee80211_vif_get_shift(&sdata->vif);
 650
 651         if (assoc_data->supp_rates_len) {
 652                 /*
 653                  * Get all rates supported by the device and the AP as
 654                  * some APs don't like getting a superset of their rates
 655                  * in the association request (e.g. D-Link DAP 1353 in
 656                  * b-only mode)...
 657                  */
 658                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 659                                                      assoc_data->supp_rates,
 660                                                      assoc_data->supp_rates_len,
 661                                                      &rates);
 662         } else {
 663                 /*
 664                  * In case AP not provide any supported rates information
 665                  * before association, we send information element(s) with
 666                  * all rates that we support.
 667                  */
 668                 rates_len = 0;
 669                 for (i = 0; i < sband->n_bitrates; i++) {
 670                         if ((rate_flags & sband->bitrates[i].flags)
 671                             != rate_flags)
 672                                 continue;
 673                         rates |= BIT(i);
 674                         rates_len++;
 675                 }
 676         }
 677
 678         skb = alloc_skb(local->hw.extra_tx_headroom +
 679                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 680                         2 + assoc_data->ssid_len + /* SSID */
 681                         4 + rates_len + /* (extended) rates */
 682                         4 + /* power capability */
 683                         2 + 2 * sband->n_channels + /* supported channels */
 684                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 685                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 686                         assoc_data->ie_len + /* extra IEs */
 687                         9, /* WMM */
 688                         GFP_KERNEL);
 689         if (!skb)
 690                 return;
 691
 692         skb_reserve(skb, local->hw.extra_tx_headroom);
 693
 694         capab = WLAN_CAPABILITY_ESS;
 695
 696         if (sband->band == IEEE80211_BAND_2GHZ) {
 697                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 698                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 699         }
 700
 701         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 702                 capab |= WLAN_CAPABILITY_PRIVACY;
 703
 704         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 705             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 706                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 707
 708         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 709                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 710
 711         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 712         memset(mgmt, 0, 24);
 713         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 714         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 715         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 716
 717         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 718                 skb_put(skb, 10);
 719                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 720                                                   IEEE80211_STYPE_REASSOC_REQ);
 721                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 722                 mgmt->u.reassoc_req.listen_interval =
 723                                 cpu_to_le16(local->hw.conf.listen_interval);
 724                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 725                        ETH_ALEN);
 726         } else {
 727                 skb_put(skb, 4);
 728                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 729                                                   IEEE80211_STYPE_ASSOC_REQ);
 730                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 731                 mgmt->u.assoc_req.listen_interval =
 732                                 cpu_to_le16(local->hw.conf.listen_interval);
 733         }
 734
 735         /* SSID */
 736         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 737         *pos++ = WLAN_EID_SSID;
 738         *pos++ = assoc_data->ssid_len;
 739         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 740
 741         /* add all rates which were marked to be used above */
 742         supp_rates_len = rates_len;
 743         if (supp_rates_len > 8)
 744                 supp_rates_len = 8;
 745
 746         pos = skb_put(skb, supp_rates_len + 2);
 747         *pos++ = WLAN_EID_SUPP_RATES;
 748         *pos++ = supp_rates_len;
 749
 750         count = 0;
 751         for (i = 0; i < sband->n_bitrates; i++) {
 752                 if (BIT(i) & rates) {
 753                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 754                                                 5 * (1 << shift));
 755                         *pos++ = (u8) rate;
 756                         if (++count == 8)
 757                                 break;
 758                 }
 759         }
 760
 761         if (rates_len > count) {
 762                 pos = skb_put(skb, rates_len - count + 2);
 763                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 764                 *pos++ = rates_len - count;
 765
 766                 for (i++; i < sband->n_bitrates; i++) {
 767                         if (BIT(i) & rates) {
 768                                 int rate;
 769                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 770                                                     5 * (1 << shift));
 771                                 *pos++ = (u8) rate;
 772                         }
 773                 }
 774         }
 775
 776         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 777             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 778                 pos = skb_put(skb, 4);
 779                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 780                 *pos++ = 2;
 781                 *pos++ = 0; /* min tx power */
 782                  /* max tx power */
 783                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 784         }
 785
 786         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 787                 /* TODO: get this in reg domain format */
 788                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 789                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 790                 *pos++ = 2 * sband->n_channels;
 791                 for (i = 0; i < sband->n_channels; i++) {
 792                         *pos++ = ieee80211_frequency_to_channel(
 793                                         sband->channels[i].center_freq);
 794                         *pos++ = 1; /* one channel in the subband*/
 795                 }
 796         }
 797
 798         /* if present, add any custom IEs that go before HT */
 799         if (assoc_data->ie_len) {
 800                 static const u8 before_ht[] = {
 801                         WLAN_EID_SSID,
 802                         WLAN_EID_SUPP_RATES,
 803                         WLAN_EID_EXT_SUPP_RATES,
 804                         WLAN_EID_PWR_CAPABILITY,
 805                         WLAN_EID_SUPPORTED_CHANNELS,
 806                         WLAN_EID_RSN,
 807                         WLAN_EID_QOS_CAPA,
 808                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 809                         WLAN_EID_MOBILITY_DOMAIN,
 810                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 811                         WLAN_EID_RIC_DATA,              /* reassoc only */
 812                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 813                 };
 814                 static const u8 after_ric[] = {
 815                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 816                         WLAN_EID_HT_CAPABILITY,
 817                         WLAN_EID_BSS_COEX_2040,
 818                         WLAN_EID_EXT_CAPABILITY,
 819                         WLAN_EID_QOS_TRAFFIC_CAPA,
 820                         WLAN_EID_TIM_BCAST_REQ,
 821                         WLAN_EID_INTERWORKING,
 822                         /* 60GHz doesn't happen right now */
 823                         WLAN_EID_VHT_CAPABILITY,
 824                         WLAN_EID_OPMODE_NOTIF,
 825                 };
 826
 827                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 828                                                  assoc_data->ie_len,
 829                                                  before_ht,
 830                                                  ARRAY_SIZE(before_ht),
 831                                                  after_ric,
 832                                                  ARRAY_SIZE(after_ric),
 833                                                  offset);
 834                 pos = skb_put(skb, noffset - offset);
 835                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 836                 offset = noffset;
 837         }
 838
 839         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 840                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 841                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 842
 843         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 844                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 845                                     sband, chan, sdata->smps_mode);
 846
 847         /* if present, add any custom IEs that go before VHT */
 848         if (assoc_data->ie_len) {
 849                 static const u8 before_vht[] = {
 850                         WLAN_EID_SSID,
 851                         WLAN_EID_SUPP_RATES,
 852                         WLAN_EID_EXT_SUPP_RATES,
 853                         WLAN_EID_PWR_CAPABILITY,
 854                         WLAN_EID_SUPPORTED_CHANNELS,
 855                         WLAN_EID_RSN,
 856                         WLAN_EID_QOS_CAPA,
 857                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 858                         WLAN_EID_MOBILITY_DOMAIN,
 859                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 860                         WLAN_EID_HT_CAPABILITY,
 861                         WLAN_EID_BSS_COEX_2040,
 862                         WLAN_EID_EXT_CAPABILITY,
 863                         WLAN_EID_QOS_TRAFFIC_CAPA,
 864                         WLAN_EID_TIM_BCAST_REQ,
 865                         WLAN_EID_INTERWORKING,
 866                 };
 867
 868                 /* RIC already taken above, so no need to handle here anymore */
 869                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 870                                              before_vht, ARRAY_SIZE(before_vht),
 871                                              offset);
 872                 pos = skb_put(skb, noffset - offset);
 873                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 874                 offset = noffset;
 875         }
 876
 877         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 878                 ieee80211_add_vht_ie(sdata, skb, sband,
 879                                      &assoc_data->ap_vht_cap);
 880
 881         /* if present, add any custom non-vendor IEs that go after HT */
 882         if (assoc_data->ie_len) {
 883                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 884                                                     assoc_data->ie_len,
 885                                                     offset);
 886                 pos = skb_put(skb, noffset - offset);
 887                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 888                 offset = noffset;
 889         }
 890
 891         if (assoc_data->wmm) {
 892                 if (assoc_data->uapsd) {
 893                         qos_info = ifmgd->uapsd_queues;
 894                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 895                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 896                 } else {
 897                         qos_info = 0;
 898                 }
 899
 900                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 901         }
 902
 903         /* add any remaining custom (i.e. vendor specific here) IEs */
 904         if (assoc_data->ie_len) {
 905                 noffset = assoc_data->ie_len;
 906                 pos = skb_put(skb, noffset - offset);
 907                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 908         }
 909
 910         drv_mgd_prepare_tx(local, sdata);
 911
 912         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 913         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 914                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 915                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 916         ieee80211_tx_skb(sdata, skb);
 917 }
 918
 919 void ieee80211_send_pspoll(struct ieee80211_local *local,
 920                            struct ieee80211_sub_if_data *sdata)
 921 {
 922         struct ieee80211_pspoll *pspoll;
 923         struct sk_buff *skb;
 924
 925         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 926         if (!skb)
 927                 return;
 928
 929         pspoll = (struct ieee80211_pspoll *) skb->data;
 930         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 931
 932         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 933         ieee80211_tx_skb(sdata, skb);
 934 }
 935
 936 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 937                              struct ieee80211_sub_if_data *sdata,
 938                              bool powersave)
 939 {
 940         struct sk_buff *skb;
 941         struct ieee80211_hdr_3addr *nullfunc;
 942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 943
 944         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 945         if (!skb)
 946                 return;
 947
 948         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 949         if (powersave)
 950                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 951
 952         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 953                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 954
 955         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 956                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 957
 958         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 959                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 960
 961         ieee80211_tx_skb(sdata, skb);
 962 }
 963
 964 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 965                                           struct ieee80211_sub_if_data *sdata)
 966 {
 967         struct sk_buff *skb;
 968         struct ieee80211_hdr *nullfunc;
 969         __le16 fc;
 970
 971         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 972                 return;
 973
 974         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 975         if (!skb)
 976                 return;
 977
 978         skb_reserve(skb, local->hw.extra_tx_headroom);
 979
 980         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 981         memset(nullfunc, 0, 30);
 982         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 983                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 984         nullfunc->frame_control = fc;
 985         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 986         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 987         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 988         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 989
 990         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 991         ieee80211_tx_skb(sdata, skb);
 992 }
 993
 994 /* spectrum management related things */
 995 static void ieee80211_chswitch_work(struct work_struct *work)
 996 {
 997         struct ieee80211_sub_if_data *sdata =
 998                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 999         struct ieee80211_local *local = sdata->local;
1000         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1001         int ret;
1002
1003         if (!ieee80211_sdata_running(sdata))
1004                 return;
1005
1006         sdata_lock(sdata);
1007         mutex_lock(&local->mtx);
1008         mutex_lock(&local->chanctx_mtx);
1009
1010         if (!ifmgd->associated)
1011                 goto out;
1012
1013         if (!sdata->vif.csa_active)
1014                 goto out;
1015
1016         /*
1017          * using reservation isn't immediate as it may be deferred until later
1018          * with multi-vif. once reservation is complete it will re-schedule the
1019          * work with no reserved_chanctx so verify chandef to check if it
1020          * completed successfully
1021          */
1022
1023         if (sdata->reserved_chanctx) {
1024                 /*
1025                  * with multi-vif csa driver may call ieee80211_csa_finish()
1026                  * many times while waiting for other interfaces to use their
1027                  * reservations
1028                  */
1029                 if (sdata->reserved_ready)
1030                         goto out;
1031
1032                 ret = ieee80211_vif_use_reserved_context(sdata);
1033                 if (ret) {
1034                         sdata_info(sdata,
1035                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1036                                    ret);
1037                         ieee80211_queue_work(&sdata->local->hw,
1038                                              &ifmgd->csa_connection_drop_work);
1039                         goto out;
1040                 }
1041
1042                 goto out;
1043         }
1044
1045         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1046                                         &sdata->csa_chandef)) {
1047                 sdata_info(sdata,
1048                            "failed to finalize channel switch, disconnecting\n");
1049                 ieee80211_queue_work(&sdata->local->hw,
1050                                      &ifmgd->csa_connection_drop_work);
1051                 goto out;
1052         }
1053
1054         /* XXX: shouldn't really modify cfg80211-owned data! */
1055         ifmgd->associated->channel = sdata->csa_chandef.chan;
1056
1057         ifmgd->csa_waiting_bcn = true;
1058
1059         ieee80211_sta_reset_beacon_monitor(sdata);
1060         ieee80211_sta_reset_conn_monitor(sdata);
1061
1062 out:
1063         mutex_unlock(&local->chanctx_mtx);
1064         mutex_unlock(&local->mtx);
1065         sdata_unlock(sdata);
1066 }
1067
1068 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1069 {
1070         struct ieee80211_local *local = sdata->local;
1071         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1072         int ret;
1073
1074         sdata_assert_lock(sdata);
1075
1076         WARN_ON(!sdata->vif.csa_active);
1077
1078         if (sdata->csa_block_tx) {
1079                 ieee80211_wake_vif_queues(local, sdata,
1080                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1081                 sdata->csa_block_tx = false;
1082         }
1083
1084         sdata->vif.csa_active = false;
1085         ifmgd->csa_waiting_bcn = false;
1086
1087         ret = drv_post_channel_switch(sdata);
1088         if (ret) {
1089                 sdata_info(sdata,
1090                            "driver post channel switch failed, disconnecting\n");
1091                 ieee80211_queue_work(&local->hw,
1092                                      &ifmgd->csa_connection_drop_work);
1093                 return;
1094         }
1095
1096         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1097 }
1098
1099 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1100 {
1101         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1102         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1103
1104         trace_api_chswitch_done(sdata, success);
1105         if (!success) {
1106                 sdata_info(sdata,
1107                            "driver channel switch failed, disconnecting\n");
1108                 ieee80211_queue_work(&sdata->local->hw,
1109                                      &ifmgd->csa_connection_drop_work);
1110         } else {
1111                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1112         }
1113 }
1114 EXPORT_SYMBOL(ieee80211_chswitch_done);
1115
1116 static void ieee80211_chswitch_timer(unsigned long data)
1117 {
1118         struct ieee80211_sub_if_data *sdata =
1119                 (struct ieee80211_sub_if_data *) data;
1120
1121         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1122 }
1123
1124 static void
1125 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1126                                  u64 timestamp, u32 device_timestamp,
1127                                  struct ieee802_11_elems *elems,
1128                                  bool beacon)
1129 {
1130         struct ieee80211_local *local = sdata->local;
1131         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1132         struct cfg80211_bss *cbss = ifmgd->associated;
1133         struct ieee80211_chanctx_conf *conf;
1134         struct ieee80211_chanctx *chanctx;
1135         enum ieee80211_band current_band;
1136         struct ieee80211_csa_ie csa_ie;
1137         struct ieee80211_channel_switch ch_switch;
1138         int res;
1139
1140         sdata_assert_lock(sdata);
1141
1142         if (!cbss)
1143                 return;
1144
1145         if (local->scanning)
1146                 return;
1147
1148         /* disregard subsequent announcements if we are already processing */
1149         if (sdata->vif.csa_active)
1150                 return;
1151
1152         current_band = cbss->channel->band;
1153         memset(&csa_ie, 0, sizeof(csa_ie));
1154         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1155                                            ifmgd->flags,
1156                                            ifmgd->associated->bssid, &csa_ie);
1157         if (res < 0)
1158                 ieee80211_queue_work(&local->hw,
1159                                      &ifmgd->csa_connection_drop_work);
1160         if (res)
1161                 return;
1162
1163         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1164                                      IEEE80211_CHAN_DISABLED)) {
1165                 sdata_info(sdata,
1166                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1167                            ifmgd->associated->bssid,
1168                            csa_ie.chandef.chan->center_freq,
1169                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1170                            csa_ie.chandef.center_freq2);
1171                 ieee80211_queue_work(&local->hw,
1172                                      &ifmgd->csa_connection_drop_work);
1173                 return;
1174         }
1175
1176         if (cfg80211_chandef_identical(&csa_ie.chandef,
1177                                        &sdata->vif.bss_conf.chandef)) {
1178                 if (ifmgd->csa_ignored_same_chan)
1179                         return;
1180                 sdata_info(sdata,
1181                            "AP %pM tries to chanswitch to same channel, ignore\n",
1182                            ifmgd->associated->bssid);
1183                 ifmgd->csa_ignored_same_chan = true;
1184                 return;
1185         }
1186
1187         /*
1188          * Drop all TDLS peers - either we disconnect or move to a different
1189          * channel from this point on. There's no telling what our peer will do.
1190          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1191          * have an incompatible wider chandef.
1192          */
1193         ieee80211_teardown_tdls_peers(sdata);
1194
1195         mutex_lock(&local->mtx);
1196         mutex_lock(&local->chanctx_mtx);
1197         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1198                                          lockdep_is_held(&local->chanctx_mtx));
1199         if (!conf) {
1200                 sdata_info(sdata,
1201                            "no channel context assigned to vif?, disconnecting\n");
1202                 goto drop_connection;
1203         }
1204
1205         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1206
1207         if (local->use_chanctx &&
1208             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1209                 sdata_info(sdata,
1210                            "driver doesn't support chan-switch with channel contexts\n");
1211                 goto drop_connection;
1212         }
1213
1214         ch_switch.timestamp = timestamp;
1215         ch_switch.device_timestamp = device_timestamp;
1216         ch_switch.block_tx = csa_ie.mode;
1217         ch_switch.chandef = csa_ie.chandef;
1218         ch_switch.count = csa_ie.count;
1219
1220         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1221                 sdata_info(sdata,
1222                            "preparing for channel switch failed, disconnecting\n");
1223                 goto drop_connection;
1224         }
1225
1226         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1227                                             chanctx->mode, false);
1228         if (res) {
1229                 sdata_info(sdata,
1230                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1231                            res);
1232                 goto drop_connection;
1233         }
1234         mutex_unlock(&local->chanctx_mtx);
1235
1236         sdata->vif.csa_active = true;
1237         sdata->csa_chandef = csa_ie.chandef;
1238         sdata->csa_block_tx = csa_ie.mode;
1239         ifmgd->csa_ignored_same_chan = false;
1240
1241         if (sdata->csa_block_tx)
1242                 ieee80211_stop_vif_queues(local, sdata,
1243                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1244         mutex_unlock(&local->mtx);
1245
1246         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1247                                           csa_ie.count);
1248
1249         if (local->ops->channel_switch) {
1250                 /* use driver's channel switch callback */
1251                 drv_channel_switch(local, sdata, &ch_switch);
1252                 return;
1253         }
1254
1255         /* channel switch handled in software */
1256         if (csa_ie.count <= 1)
1257                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1258         else
1259                 mod_timer(&ifmgd->chswitch_timer,
1260                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1261                                          cbss->beacon_interval));
1262         return;
1263  drop_connection:
1264         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1265         mutex_unlock(&local->chanctx_mtx);
1266         mutex_unlock(&local->mtx);
1267 }
1268
1269 static bool
1270 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1271                                  struct ieee80211_channel *channel,
1272                                  const u8 *country_ie, u8 country_ie_len,
1273                                  const u8 *pwr_constr_elem,
1274                                  int *chan_pwr, int *pwr_reduction)
1275 {
1276         struct ieee80211_country_ie_triplet *triplet;
1277         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1278         int i, chan_increment;
1279         bool have_chan_pwr = false;
1280
1281         /* Invalid IE */
1282         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1283                 return false;
1284
1285         triplet = (void *)(country_ie + 3);
1286         country_ie_len -= 3;
1287
1288         switch (channel->band) {
1289         default:
1290                 WARN_ON_ONCE(1);
1291                 /* fall through */
1292         case IEEE80211_BAND_2GHZ:
1293         case IEEE80211_BAND_60GHZ:
1294                 chan_increment = 1;
1295                 break;
1296         case IEEE80211_BAND_5GHZ:
1297                 chan_increment = 4;
1298                 break;
1299         }
1300
1301         /* find channel */
1302         while (country_ie_len >= 3) {
1303                 u8 first_channel = triplet->chans.first_channel;
1304
1305                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1306                         goto next;
1307
1308                 for (i = 0; i < triplet->chans.num_channels; i++) {
1309                         if (first_channel + i * chan_increment == chan) {
1310                                 have_chan_pwr = true;
1311                                 *chan_pwr = triplet->chans.max_power;
1312                                 break;
1313                         }
1314                 }
1315                 if (have_chan_pwr)
1316                         break;
1317
1318  next:
1319                 triplet++;
1320                 country_ie_len -= 3;
1321         }
1322
1323         if (have_chan_pwr && pwr_constr_elem)
1324                 *pwr_reduction = *pwr_constr_elem;
1325         else
1326                 *pwr_reduction = 0;
1327
1328         return have_chan_pwr;
1329 }
1330
1331 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1332                                       struct ieee80211_channel *channel,
1333                                       const u8 *cisco_dtpc_ie,
1334                                       int *pwr_level)
1335 {
1336         /* From practical testing, the first data byte of the DTPC element
1337          * seems to contain the requested dBm level, and the CLI on Cisco
1338          * APs clearly state the range is -127 to 127 dBm, which indicates
1339          * a signed byte, although it seemingly never actually goes negative.
1340          * The other byte seems to always be zero.
1341          */
1342         *pwr_level = (__s8)cisco_dtpc_ie[4];
1343 }
1344
1345 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1346                                        struct ieee80211_channel *channel,
1347                                        struct ieee80211_mgmt *mgmt,
1348                                        const u8 *country_ie, u8 country_ie_len,
1349                                        const u8 *pwr_constr_ie,
1350                                        const u8 *cisco_dtpc_ie)
1351 {
1352         bool has_80211h_pwr = false, has_cisco_pwr = false;
1353         int chan_pwr = 0, pwr_reduction_80211h = 0;
1354         int pwr_level_cisco, pwr_level_80211h;
1355         int new_ap_level;
1356         __le16 capab = mgmt->u.probe_resp.capab_info;
1357
1358         if (country_ie &&
1359             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1360              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1361                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1362                         sdata, channel, country_ie, country_ie_len,
1363                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1364                 pwr_level_80211h =
1365                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1366         }
1367
1368         if (cisco_dtpc_ie) {
1369                 ieee80211_find_cisco_dtpc(
1370                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1371                 has_cisco_pwr = true;
1372         }
1373
1374         if (!has_80211h_pwr && !has_cisco_pwr)
1375                 return 0;
1376
1377         /* If we have both 802.11h and Cisco DTPC, apply both limits
1378          * by picking the smallest of the two power levels advertised.
1379          */
1380         if (has_80211h_pwr &&
1381             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1382                 sdata_dbg(sdata,
1383                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1384                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1385                           sdata->u.mgd.bssid);
1386                 new_ap_level = pwr_level_80211h;
1387         } else {  /* has_cisco_pwr is always true here. */
1388                 sdata_dbg(sdata,
1389                           "Limiting TX power to %d dBm as advertised by %pM\n",
1390                           pwr_level_cisco, sdata->u.mgd.bssid);
1391                 new_ap_level = pwr_level_cisco;
1392         }
1393
1394         if (sdata->ap_power_level == new_ap_level)
1395                 return 0;
1396
1397         sdata->ap_power_level = new_ap_level;
1398         if (__ieee80211_recalc_txpower(sdata))
1399                 return BSS_CHANGED_TXPOWER;
1400         return 0;
1401 }
1402
1403 /* powersave */
1404 static void ieee80211_enable_ps(struct ieee80211_local *local,
1405                                 struct ieee80211_sub_if_data *sdata)
1406 {
1407         struct ieee80211_conf *conf = &local->hw.conf;
1408
1409         /*
1410          * If we are scanning right now then the parameters will
1411          * take effect when scan finishes.
1412          */
1413         if (local->scanning)
1414                 return;
1415
1416         if (conf->dynamic_ps_timeout > 0 &&
1417             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1418                 mod_timer(&local->dynamic_ps_timer, jiffies +
1419                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1420         } else {
1421                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1422                         ieee80211_send_nullfunc(local, sdata, true);
1423
1424                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1425                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1426                         return;
1427
1428                 conf->flags |= IEEE80211_CONF_PS;
1429                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1430         }
1431 }
1432
1433 static void ieee80211_change_ps(struct ieee80211_local *local)
1434 {
1435         struct ieee80211_conf *conf = &local->hw.conf;
1436
1437         if (local->ps_sdata) {
1438                 ieee80211_enable_ps(local, local->ps_sdata);
1439         } else if (conf->flags & IEEE80211_CONF_PS) {
1440                 conf->flags &= ~IEEE80211_CONF_PS;
1441                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1442                 del_timer_sync(&local->dynamic_ps_timer);
1443                 cancel_work_sync(&local->dynamic_ps_enable_work);
1444         }
1445 }
1446
1447 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1448 {
1449         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1450         struct sta_info *sta = NULL;
1451         bool authorized = false;
1452
1453         if (!mgd->powersave)
1454                 return false;
1455
1456         if (mgd->broken_ap)
1457                 return false;
1458
1459         if (!mgd->associated)
1460                 return false;
1461
1462         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1463                 return false;
1464
1465         if (!mgd->have_beacon)
1466                 return false;
1467
1468         rcu_read_lock();
1469         sta = sta_info_get(sdata, mgd->bssid);
1470         if (sta)
1471                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1472         rcu_read_unlock();
1473
1474         return authorized;
1475 }
1476
1477 /* need to hold RTNL or interface lock */
1478 void ieee80211_recalc_ps(struct ieee80211_local *local)
1479 {
1480         struct ieee80211_sub_if_data *sdata, *found = NULL;
1481         int count = 0;
1482         int timeout;
1483
1484         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1485                 local->ps_sdata = NULL;
1486                 return;
1487         }
1488
1489         list_for_each_entry(sdata, &local->interfaces, list) {
1490                 if (!ieee80211_sdata_running(sdata))
1491                         continue;
1492                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1493                         /* If an AP vif is found, then disable PS
1494                          * by setting the count to zero thereby setting
1495                          * ps_sdata to NULL.
1496                          */
1497                         count = 0;
1498                         break;
1499                 }
1500                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1501                         continue;
1502                 found = sdata;
1503                 count++;
1504         }
1505
1506         if (count == 1 && ieee80211_powersave_allowed(found)) {
1507                 u8 dtimper = found->u.mgd.dtim_period;
1508                 s32 beaconint_us;
1509
1510                 beaconint_us = ieee80211_tu_to_usec(
1511                                         found->vif.bss_conf.beacon_int);
1512
1513                 timeout = local->dynamic_ps_forced_timeout;
1514                 if (timeout < 0)
1515                         timeout = 100;
1516                 local->hw.conf.dynamic_ps_timeout = timeout;
1517
1518                 /* If the TIM IE is invalid, pretend the value is 1 */
1519                 if (!dtimper)
1520                         dtimper = 1;
1521
1522                 local->hw.conf.ps_dtim_period = dtimper;
1523                 local->ps_sdata = found;
1524         } else {
1525                 local->ps_sdata = NULL;
1526         }
1527
1528         ieee80211_change_ps(local);
1529 }
1530
1531 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1532 {
1533         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1534
1535         if (sdata->vif.bss_conf.ps != ps_allowed) {
1536                 sdata->vif.bss_conf.ps = ps_allowed;
1537                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1538         }
1539 }
1540
1541 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1542 {
1543         struct ieee80211_local *local =
1544                 container_of(work, struct ieee80211_local,
1545                              dynamic_ps_disable_work);
1546
1547         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1548                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1549                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1550         }
1551
1552         ieee80211_wake_queues_by_reason(&local->hw,
1553                                         IEEE80211_MAX_QUEUE_MAP,
1554                                         IEEE80211_QUEUE_STOP_REASON_PS,
1555                                         false);
1556 }
1557
1558 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1559 {
1560         struct ieee80211_local *local =
1561                 container_of(work, struct ieee80211_local,
1562                              dynamic_ps_enable_work);
1563         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1564         struct ieee80211_if_managed *ifmgd;
1565         unsigned long flags;
1566         int q;
1567
1568         /* can only happen when PS was just disabled anyway */
1569         if (!sdata)
1570                 return;
1571
1572         ifmgd = &sdata->u.mgd;
1573
1574         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1575                 return;
1576
1577         if (local->hw.conf.dynamic_ps_timeout > 0) {
1578                 /* don't enter PS if TX frames are pending */
1579                 if (drv_tx_frames_pending(local)) {
1580                         mod_timer(&local->dynamic_ps_timer, jiffies +
1581                                   msecs_to_jiffies(
1582                                   local->hw.conf.dynamic_ps_timeout));
1583                         return;
1584                 }
1585
1586                 /*
1587                  * transmission can be stopped by others which leads to
1588                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1589                  * is not the actual idle state.
1590                  */
1591                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1592                 for (q = 0; q < local->hw.queues; q++) {
1593                         if (local->queue_stop_reasons[q]) {
1594                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1595                                                        flags);
1596                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1597                                           msecs_to_jiffies(
1598                                           local->hw.conf.dynamic_ps_timeout));
1599                                 return;
1600                         }
1601                 }
1602                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1603         }
1604
1605         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1606             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1607                 if (drv_tx_frames_pending(local)) {
1608                         mod_timer(&local->dynamic_ps_timer, jiffies +
1609                                   msecs_to_jiffies(
1610                                   local->hw.conf.dynamic_ps_timeout));
1611                 } else {
1612                         ieee80211_send_nullfunc(local, sdata, true);
1613                         /* Flush to get the tx status of nullfunc frame */
1614                         ieee80211_flush_queues(local, sdata, false);
1615                 }
1616         }
1617
1618         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1619               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1620             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1621                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1622                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1623                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1624         }
1625 }
1626
1627 void ieee80211_dynamic_ps_timer(unsigned long data)
1628 {
1629         struct ieee80211_local *local = (void *) data;
1630
1631         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1632 }
1633
1634 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1635 {
1636         struct delayed_work *delayed_work =
1637                 container_of(work, struct delayed_work, work);
1638         struct ieee80211_sub_if_data *sdata =
1639                 container_of(delayed_work, struct ieee80211_sub_if_data,
1640                              dfs_cac_timer_work);
1641         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1642
1643         mutex_lock(&sdata->local->mtx);
1644         if (sdata->wdev.cac_started) {
1645                 ieee80211_vif_release_channel(sdata);
1646                 cfg80211_cac_event(sdata->dev, &chandef,
1647                                    NL80211_RADAR_CAC_FINISHED,
1648                                    GFP_KERNEL);
1649         }
1650         mutex_unlock(&sdata->local->mtx);
1651 }
1652
1653 static bool
1654 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1655 {
1656         struct ieee80211_local *local = sdata->local;
1657         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1658         bool ret = false;
1659         int ac;
1660
1661         if (local->hw.queues < IEEE80211_NUM_ACS)
1662                 return false;
1663
1664         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1665                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1666                 int non_acm_ac;
1667                 unsigned long now = jiffies;
1668
1669                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1670                     tx_tspec->admitted_time &&
1671                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1672                         tx_tspec->consumed_tx_time = 0;
1673                         tx_tspec->time_slice_start = now;
1674
1675                         if (tx_tspec->downgraded)
1676                                 tx_tspec->action =
1677                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1678                 }
1679
1680                 switch (tx_tspec->action) {
1681                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1682                         /* take the original parameters */
1683                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1684                                 sdata_err(sdata,
1685                                           "failed to set TX queue parameters for queue %d\n",
1686                                           ac);
1687                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1688                         tx_tspec->downgraded = false;
1689                         ret = true;
1690                         break;
1691                 case TX_TSPEC_ACTION_DOWNGRADE:
1692                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1693                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1694                                 ret = true;
1695                                 break;
1696                         }
1697                         /* downgrade next lower non-ACM AC */
1698                         for (non_acm_ac = ac + 1;
1699                              non_acm_ac < IEEE80211_NUM_ACS;
1700                              non_acm_ac++)
1701                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1702                                         break;
1703                         /* The loop will result in using BK even if it requires
1704                          * admission control, such configuration makes no sense
1705                          * and we have to transmit somehow - the AC selection
1706                          * does the same thing.
1707                          */
1708                         if (drv_conf_tx(local, sdata, ac,
1709                                         &sdata->tx_conf[non_acm_ac]))
1710                                 sdata_err(sdata,
1711                                           "failed to set TX queue parameters for queue %d\n",
1712                                           ac);
1713                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1714                         ret = true;
1715                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1716                                 tx_tspec->time_slice_start + HZ - now + 1);
1717                         break;
1718                 case TX_TSPEC_ACTION_NONE:
1719                         /* nothing now */
1720                         break;
1721                 }
1722         }
1723
1724         return ret;
1725 }
1726
1727 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1728 {
1729         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1730                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1731 }
1732
1733 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1734 {
1735         struct ieee80211_sub_if_data *sdata;
1736
1737         sdata = container_of(work, struct ieee80211_sub_if_data,
1738                              u.mgd.tx_tspec_wk.work);
1739         ieee80211_sta_handle_tspec_ac_params(sdata);
1740 }
1741
1742 /* MLME */
1743 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1744                                      struct ieee80211_sub_if_data *sdata,
1745                                      const u8 *wmm_param, size_t wmm_param_len)
1746 {
1747         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1748         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1749         size_t left;
1750         int count, ac;
1751         const u8 *pos;
1752         u8 uapsd_queues = 0;
1753
1754         if (!local->ops->conf_tx)
1755                 return false;
1756
1757         if (local->hw.queues < IEEE80211_NUM_ACS)
1758                 return false;
1759
1760         if (!wmm_param)
1761                 return false;
1762
1763         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1764                 return false;
1765
1766         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1767                 uapsd_queues = ifmgd->uapsd_queues;
1768
1769         count = wmm_param[6] & 0x0f;
1770         if (count == ifmgd->wmm_last_param_set)
1771                 return false;
1772         ifmgd->wmm_last_param_set = count;
1773
1774         pos = wmm_param + 8;
1775         left = wmm_param_len - 8;
1776
1777         memset(&params, 0, sizeof(params));
1778
1779         sdata->wmm_acm = 0;
1780         for (; left >= 4; left -= 4, pos += 4) {
1781                 int aci = (pos[0] >> 5) & 0x03;
1782                 int acm = (pos[0] >> 4) & 0x01;
1783                 bool uapsd = false;
1784
1785                 switch (aci) {
1786                 case 1: /* AC_BK */
1787                         ac = IEEE80211_AC_BK;
1788                         if (acm)
1789                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1790                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1791                                 uapsd = true;
1792                         break;
1793                 case 2: /* AC_VI */
1794                         ac = IEEE80211_AC_VI;
1795                         if (acm)
1796                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1797                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1798                                 uapsd = true;
1799                         break;
1800                 case 3: /* AC_VO */
1801                         ac = IEEE80211_AC_VO;
1802                         if (acm)
1803                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1804                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1805                                 uapsd = true;
1806                         break;
1807                 case 0: /* AC_BE */
1808                 default:
1809                         ac = IEEE80211_AC_BE;
1810                         if (acm)
1811                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1812                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1813                                 uapsd = true;
1814                         break;
1815                 }
1816
1817                 params[ac].aifs = pos[0] & 0x0f;
1818
1819                 if (params[ac].aifs < 2) {
1820                         sdata_info(sdata,
1821                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1822                                    params[ac].aifs, aci);
1823                         params[ac].aifs = 2;
1824                 }
1825                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1826                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1827                 params[ac].txop = get_unaligned_le16(pos + 2);
1828                 params[ac].acm = acm;
1829                 params[ac].uapsd = uapsd;
1830
1831                 if (params[ac].cw_min > params[ac].cw_max) {
1832                         sdata_info(sdata,
1833                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1834                                    params[ac].cw_min, params[ac].cw_max, aci);
1835                         return false;
1836                 }
1837         }
1838
1839         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1840                 mlme_dbg(sdata,
1841                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1842                          ac, params[ac].acm,
1843                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1844                          params[ac].txop, params[ac].uapsd,
1845                          ifmgd->tx_tspec[ac].downgraded);
1846                 sdata->tx_conf[ac] = params[ac];
1847                 if (!ifmgd->tx_tspec[ac].downgraded &&
1848                     drv_conf_tx(local, sdata, ac, &params[ac]))
1849                         sdata_err(sdata,
1850                                   "failed to set TX queue parameters for AC %d\n",
1851                                   ac);
1852         }
1853
1854         /* enable WMM or activate new settings */
1855         sdata->vif.bss_conf.qos = true;
1856         return true;
1857 }
1858
1859 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1860 {
1861         lockdep_assert_held(&sdata->local->mtx);
1862
1863         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1864         ieee80211_run_deferred_scan(sdata->local);
1865 }
1866
1867 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1868 {
1869         mutex_lock(&sdata->local->mtx);
1870         __ieee80211_stop_poll(sdata);
1871         mutex_unlock(&sdata->local->mtx);
1872 }
1873
1874 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1875                                            u16 capab, bool erp_valid, u8 erp)
1876 {
1877         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1878         u32 changed = 0;
1879         bool use_protection;
1880         bool use_short_preamble;
1881         bool use_short_slot;
1882
1883         if (erp_valid) {
1884                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1885                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1886         } else {
1887                 use_protection = false;
1888                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1889         }
1890
1891         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1892         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1893                 use_short_slot = true;
1894
1895         if (use_protection != bss_conf->use_cts_prot) {
1896                 bss_conf->use_cts_prot = use_protection;
1897                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1898         }
1899
1900         if (use_short_preamble != bss_conf->use_short_preamble) {
1901                 bss_conf->use_short_preamble = use_short_preamble;
1902                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1903         }
1904
1905         if (use_short_slot != bss_conf->use_short_slot) {
1906                 bss_conf->use_short_slot = use_short_slot;
1907                 changed |= BSS_CHANGED_ERP_SLOT;
1908         }
1909
1910         return changed;
1911 }
1912
1913 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1914                                      struct cfg80211_bss *cbss,
1915                                      u32 bss_info_changed)
1916 {
1917         struct ieee80211_bss *bss = (void *)cbss->priv;
1918         struct ieee80211_local *local = sdata->local;
1919         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1920
1921         bss_info_changed |= BSS_CHANGED_ASSOC;
1922         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1923                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1924
1925         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1926                 beacon_loss_count * bss_conf->beacon_int));
1927
1928         sdata->u.mgd.associated = cbss;
1929         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1930
1931         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1932
1933         if (sdata->vif.p2p) {
1934                 const struct cfg80211_bss_ies *ies;
1935
1936                 rcu_read_lock();
1937                 ies = rcu_dereference(cbss->ies);
1938                 if (ies) {
1939                         int ret;
1940
1941                         ret = cfg80211_get_p2p_attr(
1942                                         ies->data, ies->len,
1943                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1944                                         (u8 *) &bss_conf->p2p_noa_attr,
1945                                         sizeof(bss_conf->p2p_noa_attr));
1946                         if (ret >= 2) {
1947                                 sdata->u.mgd.p2p_noa_index =
1948                                         bss_conf->p2p_noa_attr.index;
1949                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1950                         }
1951                 }
1952                 rcu_read_unlock();
1953         }
1954
1955         /* just to be sure */
1956         ieee80211_stop_poll(sdata);
1957
1958         ieee80211_led_assoc(local, 1);
1959
1960         if (sdata->u.mgd.have_beacon) {
1961                 /*
1962                  * If the AP is buggy we may get here with no DTIM period
1963                  * known, so assume it's 1 which is the only safe assumption
1964                  * in that case, although if the TIM IE is broken powersave
1965                  * probably just won't work at all.
1966                  */
1967                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1968                 bss_conf->beacon_rate = bss->beacon_rate;
1969                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1970         } else {
1971                 bss_conf->beacon_rate = NULL;
1972                 bss_conf->dtim_period = 0;
1973         }
1974
1975         bss_conf->assoc = 1;
1976
1977         /* Tell the driver to monitor connection quality (if supported) */
1978         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1979             bss_conf->cqm_rssi_thold)
1980                 bss_info_changed |= BSS_CHANGED_CQM;
1981
1982         /* Enable ARP filtering */
1983         if (bss_conf->arp_addr_cnt)
1984                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1985
1986         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1987
1988         mutex_lock(&local->iflist_mtx);
1989         ieee80211_recalc_ps(local);
1990         mutex_unlock(&local->iflist_mtx);
1991
1992         ieee80211_recalc_smps(sdata);
1993         ieee80211_recalc_ps_vif(sdata);
1994
1995         netif_carrier_on(sdata->dev);
1996 }
1997
1998 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1999                                    u16 stype, u16 reason, bool tx,
2000                                    u8 *frame_buf)
2001 {
2002         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2003         struct ieee80211_local *local = sdata->local;
2004         u32 changed = 0;
2005
2006         sdata_assert_lock(sdata);
2007
2008         if (WARN_ON_ONCE(tx && !frame_buf))
2009                 return;
2010
2011         if (WARN_ON(!ifmgd->associated))
2012                 return;
2013
2014         ieee80211_stop_poll(sdata);
2015
2016         ifmgd->associated = NULL;
2017         netif_carrier_off(sdata->dev);
2018
2019         /*
2020          * if we want to get out of ps before disassoc (why?) we have
2021          * to do it before sending disassoc, as otherwise the null-packet
2022          * won't be valid.
2023          */
2024         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2025                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2026                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2027         }
2028         local->ps_sdata = NULL;
2029
2030         /* disable per-vif ps */
2031         ieee80211_recalc_ps_vif(sdata);
2032
2033         /* make sure ongoing transmission finishes */
2034         synchronize_net();
2035
2036         /*
2037          * drop any frame before deauth/disassoc, this can be data or
2038          * management frame. Since we are disconnecting, we should not
2039          * insist sending these frames which can take time and delay
2040          * the disconnection and possible the roaming.
2041          */
2042         if (tx)
2043                 ieee80211_flush_queues(local, sdata, true);
2044
2045         /* deauthenticate/disassociate now */
2046         if (tx || frame_buf)
2047                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2048                                                reason, tx, frame_buf);
2049
2050         /* flush out frame - make sure the deauth was actually sent */
2051         if (tx)
2052                 ieee80211_flush_queues(local, sdata, false);
2053
2054         /* clear bssid only after building the needed mgmt frames */
2055         eth_zero_addr(ifmgd->bssid);
2056
2057         /* remove AP and TDLS peers */
2058         sta_info_flush(sdata);
2059
2060         /* finally reset all BSS / config parameters */
2061         changed |= ieee80211_reset_erp_info(sdata);
2062
2063         ieee80211_led_assoc(local, 0);
2064         changed |= BSS_CHANGED_ASSOC;
2065         sdata->vif.bss_conf.assoc = false;
2066
2067         ifmgd->p2p_noa_index = -1;
2068         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2069                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2070
2071         /* on the next assoc, re-program HT/VHT parameters */
2072         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2073         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2074         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2075         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2076         sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2077
2078         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2079
2080         del_timer_sync(&local->dynamic_ps_timer);
2081         cancel_work_sync(&local->dynamic_ps_enable_work);
2082
2083         /* Disable ARP filtering */
2084         if (sdata->vif.bss_conf.arp_addr_cnt)
2085                 changed |= BSS_CHANGED_ARP_FILTER;
2086
2087         sdata->vif.bss_conf.qos = false;
2088         changed |= BSS_CHANGED_QOS;
2089
2090         /* The BSSID (not really interesting) and HT changed */
2091         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2092         ieee80211_bss_info_change_notify(sdata, changed);
2093
2094         /* disassociated - set to defaults now */
2095         ieee80211_set_wmm_default(sdata, false, false);
2096
2097         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2098         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2099         del_timer_sync(&sdata->u.mgd.timer);
2100         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2101
2102         sdata->vif.bss_conf.dtim_period = 0;
2103         sdata->vif.bss_conf.beacon_rate = NULL;
2104
2105         ifmgd->have_beacon = false;
2106
2107         ifmgd->flags = 0;
2108         mutex_lock(&local->mtx);
2109         ieee80211_vif_release_channel(sdata);
2110
2111         sdata->vif.csa_active = false;
2112         ifmgd->csa_waiting_bcn = false;
2113         ifmgd->csa_ignored_same_chan = false;
2114         if (sdata->csa_block_tx) {
2115                 ieee80211_wake_vif_queues(local, sdata,
2116                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2117                 sdata->csa_block_tx = false;
2118         }
2119         mutex_unlock(&local->mtx);
2120
2121         /* existing TX TSPEC sessions no longer exist */
2122         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2123         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2124
2125         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2126 }
2127
2128 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2129                              struct ieee80211_hdr *hdr)
2130 {
2131         /*
2132          * We can postpone the mgd.timer whenever receiving unicast frames
2133          * from AP because we know that the connection is working both ways
2134          * at that time. But multicast frames (and hence also beacons) must
2135          * be ignored here, because we need to trigger the timer during
2136          * data idle periods for sending the periodic probe request to the
2137          * AP we're connected to.
2138          */
2139         if (is_multicast_ether_addr(hdr->addr1))
2140                 return;
2141
2142         ieee80211_sta_reset_conn_monitor(sdata);
2143 }
2144
2145 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2146 {
2147         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2148         struct ieee80211_local *local = sdata->local;
2149
2150         mutex_lock(&local->mtx);
2151         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2152                 goto out;
2153
2154         __ieee80211_stop_poll(sdata);
2155
2156         mutex_lock(&local->iflist_mtx);
2157         ieee80211_recalc_ps(local);
2158         mutex_unlock(&local->iflist_mtx);
2159
2160         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2161                 goto out;
2162
2163         /*
2164          * We've received a probe response, but are not sure whether
2165          * we have or will be receiving any beacons or data, so let's
2166          * schedule the timers again, just in case.
2167          */
2168         ieee80211_sta_reset_beacon_monitor(sdata);
2169
2170         mod_timer(&ifmgd->conn_mon_timer,
2171                   round_jiffies_up(jiffies +
2172                                    IEEE80211_CONNECTION_IDLE_TIME));
2173 out:
2174         mutex_unlock(&local->mtx);
2175 }
2176
2177 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2178                                            struct ieee80211_hdr *hdr,
2179                                            u16 tx_time)
2180 {
2181         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2182         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2183         int ac = ieee80211_ac_from_tid(tid);
2184         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2185         unsigned long now = jiffies;
2186
2187         if (likely(!tx_tspec->admitted_time))
2188                 return;
2189
2190         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2191                 tx_tspec->consumed_tx_time = 0;
2192                 tx_tspec->time_slice_start = now;
2193
2194                 if (tx_tspec->downgraded) {
2195                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2196                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2197                 }
2198         }
2199
2200         if (tx_tspec->downgraded)
2201                 return;
2202
2203         tx_tspec->consumed_tx_time += tx_time;
2204
2205         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2206                 tx_tspec->downgraded = true;
2207                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2208                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2209         }
2210 }
2211
2212 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2213                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2214 {
2215         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2216
2217         if (!ieee80211_is_data(hdr->frame_control))
2218             return;
2219
2220         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2221             sdata->u.mgd.probe_send_count > 0) {
2222                 if (ack)
2223                         ieee80211_sta_reset_conn_monitor(sdata);
2224                 else
2225                         sdata->u.mgd.nullfunc_failed = true;
2226                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2227                 return;
2228         }
2229
2230         if (ack)
2231                 ieee80211_sta_reset_conn_monitor(sdata);
2232 }
2233
2234 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2235 {
2236         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2237         const u8 *ssid;
2238         u8 *dst = ifmgd->associated->bssid;
2239         u8 unicast_limit = max(1, max_probe_tries - 3);
2240
2241         /*
2242          * Try sending broadcast probe requests for the last three
2243          * probe requests after the first ones failed since some
2244          * buggy APs only support broadcast probe requests.
2245          */
2246         if (ifmgd->probe_send_count >= unicast_limit)
2247                 dst = NULL;
2248
2249         /*
2250          * When the hardware reports an accurate Tx ACK status, it's
2251          * better to send a nullfunc frame instead of a probe request,
2252          * as it will kick us off the AP quickly if we aren't associated
2253          * anymore. The timeout will be reset if the frame is ACKed by
2254          * the AP.
2255          */
2256         ifmgd->probe_send_count++;
2257
2258         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2259                 ifmgd->nullfunc_failed = false;
2260                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2261         } else {
2262                 int ssid_len;
2263
2264                 rcu_read_lock();
2265                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2266                 if (WARN_ON_ONCE(ssid == NULL))
2267                         ssid_len = 0;
2268                 else
2269                         ssid_len = ssid[1];
2270
2271                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2272                                          ssid + 2, ssid_len, NULL,
2273                                          0, (u32) -1, true, 0,
2274                                          ifmgd->associated->channel, false);
2275                 rcu_read_unlock();
2276         }
2277
2278         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2279         run_again(sdata, ifmgd->probe_timeout);
2280 }
2281
2282 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2283                                    bool beacon)
2284 {
2285         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2286         bool already = false;
2287
2288         if (!ieee80211_sdata_running(sdata))
2289                 return;
2290
2291         sdata_lock(sdata);
2292
2293         if (!ifmgd->associated)
2294                 goto out;
2295
2296         mutex_lock(&sdata->local->mtx);
2297
2298         if (sdata->local->tmp_channel || sdata->local->scanning) {
2299                 mutex_unlock(&sdata->local->mtx);
2300                 goto out;
2301         }
2302
2303         if (beacon) {
2304                 mlme_dbg_ratelimited(sdata,
2305                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2306                                      beacon_loss_count);
2307
2308                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2309         }
2310
2311         /*
2312          * The driver/our work has already reported this event or the
2313          * connection monitoring has kicked in and we have already sent
2314          * a probe request. Or maybe the AP died and the driver keeps
2315          * reporting until we disassociate...
2316          *
2317          * In either case we have to ignore the current call to this
2318          * function (except for setting the correct probe reason bit)
2319          * because otherwise we would reset the timer every time and
2320          * never check whether we received a probe response!
2321          */
2322         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2323                 already = true;
2324
2325         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2326
2327         mutex_unlock(&sdata->local->mtx);
2328
2329         if (already)
2330                 goto out;
2331
2332         mutex_lock(&sdata->local->iflist_mtx);
2333         ieee80211_recalc_ps(sdata->local);
2334         mutex_unlock(&sdata->local->iflist_mtx);
2335
2336         ifmgd->probe_send_count = 0;
2337         ieee80211_mgd_probe_ap_send(sdata);
2338  out:
2339         sdata_unlock(sdata);
2340 }
2341
2342 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2343                                           struct ieee80211_vif *vif)
2344 {
2345         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2346         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2347         struct cfg80211_bss *cbss;
2348         struct sk_buff *skb;
2349         const u8 *ssid;
2350         int ssid_len;
2351
2352         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2353                 return NULL;
2354
2355         sdata_assert_lock(sdata);
2356
2357         if (ifmgd->associated)
2358                 cbss = ifmgd->associated;
2359         else if (ifmgd->auth_data)
2360                 cbss = ifmgd->auth_data->bss;
2361         else if (ifmgd->assoc_data)
2362                 cbss = ifmgd->assoc_data->bss;
2363         else
2364                 return NULL;
2365
2366         rcu_read_lock();
2367         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2368         if (WARN_ON_ONCE(ssid == NULL))
2369                 ssid_len = 0;
2370         else
2371                 ssid_len = ssid[1];
2372
2373         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2374                                         (u32) -1, cbss->channel,
2375                                         ssid + 2, ssid_len,
2376                                         NULL, 0, true);
2377         rcu_read_unlock();
2378
2379         return skb;
2380 }
2381 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2382
2383 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2384                                         const u8 *buf, size_t len, bool tx,
2385                                         u16 reason)
2386 {
2387         struct ieee80211_event event = {
2388                 .type = MLME_EVENT,
2389                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2390                 .u.mlme.reason = reason,
2391         };
2392
2393         if (tx)
2394                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2395         else
2396                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2397
2398         drv_event_callback(sdata->local, sdata, &event);
2399 }
2400
2401 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2402 {
2403         struct ieee80211_local *local = sdata->local;
2404         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2405         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2406
2407         sdata_lock(sdata);
2408         if (!ifmgd->associated) {
2409                 sdata_unlock(sdata);
2410                 return;
2411         }
2412
2413         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2414                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2415                                true, frame_buf);
2416         mutex_lock(&local->mtx);
2417         sdata->vif.csa_active = false;
2418         ifmgd->csa_waiting_bcn = false;
2419         if (sdata->csa_block_tx) {
2420                 ieee80211_wake_vif_queues(local, sdata,
2421                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2422                 sdata->csa_block_tx = false;
2423         }
2424         mutex_unlock(&local->mtx);
2425
2426         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2427                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2428
2429         sdata_unlock(sdata);
2430 }
2431
2432 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2433 {
2434         struct ieee80211_sub_if_data *sdata =
2435                 container_of(work, struct ieee80211_sub_if_data,
2436                              u.mgd.beacon_connection_loss_work);
2437         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2438
2439         if (ifmgd->associated)
2440                 ifmgd->beacon_loss_count++;
2441
2442         if (ifmgd->connection_loss) {
2443                 sdata_info(sdata, "Connection to AP %pM lost\n",
2444                            ifmgd->bssid);
2445                 __ieee80211_disconnect(sdata);
2446         } else {
2447                 ieee80211_mgd_probe_ap(sdata, true);
2448         }
2449 }
2450
2451 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2452 {
2453         struct ieee80211_sub_if_data *sdata =
2454                 container_of(work, struct ieee80211_sub_if_data,
2455                              u.mgd.csa_connection_drop_work);
2456
2457         __ieee80211_disconnect(sdata);
2458 }
2459
2460 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2461 {
2462         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2463         struct ieee80211_hw *hw = &sdata->local->hw;
2464
2465         trace_api_beacon_loss(sdata);
2466
2467         sdata->u.mgd.connection_loss = false;
2468         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2469 }
2470 EXPORT_SYMBOL(ieee80211_beacon_loss);
2471
2472 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2473 {
2474         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2475         struct ieee80211_hw *hw = &sdata->local->hw;
2476
2477         trace_api_connection_loss(sdata);
2478
2479         sdata->u.mgd.connection_loss = true;
2480         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2481 }
2482 EXPORT_SYMBOL(ieee80211_connection_loss);
2483
2484
2485 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2486                                         bool assoc)
2487 {
2488         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2489
2490         sdata_assert_lock(sdata);
2491
2492         if (!assoc) {
2493                 /*
2494                  * we are not authenticated yet, the only timer that could be
2495                  * running is the timeout for the authentication response which
2496                  * which is not relevant anymore.
2497                  */
2498                 del_timer_sync(&sdata->u.mgd.timer);
2499                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2500
2501                 eth_zero_addr(sdata->u.mgd.bssid);
2502                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2503                 sdata->u.mgd.flags = 0;
2504                 mutex_lock(&sdata->local->mtx);
2505                 ieee80211_vif_release_channel(sdata);
2506                 mutex_unlock(&sdata->local->mtx);
2507         }
2508
2509         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2510         kfree(auth_data);
2511         sdata->u.mgd.auth_data = NULL;
2512 }
2513
2514 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2515                                          bool assoc)
2516 {
2517         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2518
2519         sdata_assert_lock(sdata);
2520
2521         if (!assoc) {
2522                 /*
2523                  * we are not associated yet, the only timer that could be
2524                  * running is the timeout for the association response which
2525                  * which is not relevant anymore.
2526                  */
2527                 del_timer_sync(&sdata->u.mgd.timer);
2528                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2529
2530                 eth_zero_addr(sdata->u.mgd.bssid);
2531                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2532                 sdata->u.mgd.flags = 0;
2533                 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2534                 mutex_lock(&sdata->local->mtx);
2535                 ieee80211_vif_release_channel(sdata);
2536                 mutex_unlock(&sdata->local->mtx);
2537         }
2538
2539         kfree(assoc_data);
2540         sdata->u.mgd.assoc_data = NULL;
2541 }
2542
2543 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2544                                      struct ieee80211_mgmt *mgmt, size_t len)
2545 {
2546         struct ieee80211_local *local = sdata->local;
2547         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2548         u8 *pos;
2549         struct ieee802_11_elems elems;
2550         u32 tx_flags = 0;
2551
2552         pos = mgmt->u.auth.variable;
2553         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2554         if (!elems.challenge)
2555                 return;
2556         auth_data->expected_transaction = 4;
2557         drv_mgd_prepare_tx(sdata->local, sdata);
2558         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2559                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2560                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2561         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2562                             elems.challenge - 2, elems.challenge_len + 2,
2563                             auth_data->bss->bssid, auth_data->bss->bssid,
2564                             auth_data->key, auth_data->key_len,
2565                             auth_data->key_idx, tx_flags);
2566 }
2567
2568 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2569                                    struct ieee80211_mgmt *mgmt, size_t len)
2570 {
2571         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2572         u8 bssid[ETH_ALEN];
2573         u16 auth_alg, auth_transaction, status_code;
2574         struct sta_info *sta;
2575         struct ieee80211_event event = {
2576                 .type = MLME_EVENT,
2577                 .u.mlme.data = AUTH_EVENT,
2578         };
2579
2580         sdata_assert_lock(sdata);
2581
2582         if (len < 24 + 6)
2583                 return;
2584
2585         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2586                 return;
2587
2588         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2589
2590         if (!ether_addr_equal(bssid, mgmt->bssid))
2591                 return;
2592
2593         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2594         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2595         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2596
2597         if (auth_alg != ifmgd->auth_data->algorithm ||
2598             auth_transaction != ifmgd->auth_data->expected_transaction) {
2599                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2600                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2601                            auth_transaction,
2602                            ifmgd->auth_data->expected_transaction);
2603                 return;
2604         }
2605
2606         if (status_code != WLAN_STATUS_SUCCESS) {
2607                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2608                            mgmt->sa, status_code);
2609                 ieee80211_destroy_auth_data(sdata, false);
2610                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2611                 event.u.mlme.status = MLME_DENIED;
2612                 event.u.mlme.reason = status_code;
2613                 drv_event_callback(sdata->local, sdata, &event);
2614                 return;
2615         }
2616
2617         switch (ifmgd->auth_data->algorithm) {
2618         case WLAN_AUTH_OPEN:
2619         case WLAN_AUTH_LEAP:
2620         case WLAN_AUTH_FT:
2621         case WLAN_AUTH_SAE:
2622                 break;
2623         case WLAN_AUTH_SHARED_KEY:
2624                 if (ifmgd->auth_data->expected_transaction != 4) {
2625                         ieee80211_auth_challenge(sdata, mgmt, len);
2626                         /* need another frame */
2627                         return;
2628                 }
2629                 break;
2630         default:
2631                 WARN_ONCE(1, "invalid auth alg %d",
2632                           ifmgd->auth_data->algorithm);
2633                 return;
2634         }
2635
2636         event.u.mlme.status = MLME_SUCCESS;
2637         drv_event_callback(sdata->local, sdata, &event);
2638         sdata_info(sdata, "authenticated\n");
2639         ifmgd->auth_data->done = true;
2640         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2641         ifmgd->auth_data->timeout_started = true;
2642         run_again(sdata, ifmgd->auth_data->timeout);
2643
2644         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2645             ifmgd->auth_data->expected_transaction != 2) {
2646                 /*
2647                  * Report auth frame to user space for processing since another
2648                  * round of Authentication frames is still needed.
2649                  */
2650                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2651                 return;
2652         }
2653
2654         /* move station state to auth */
2655         mutex_lock(&sdata->local->sta_mtx);
2656         sta = sta_info_get(sdata, bssid);
2657         if (!sta) {
2658                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2659                 goto out_err;
2660         }
2661         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2662                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2663                 goto out_err;
2664         }
2665         mutex_unlock(&sdata->local->sta_mtx);
2666
2667         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2668         return;
2669  out_err:
2670         mutex_unlock(&sdata->local->sta_mtx);
2671         /* ignore frame -- wait for timeout */
2672 }
2673
2674 #define case_WLAN(type) \
2675         case WLAN_REASON_##type: return #type
2676
2677 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2678 {
2679         switch (reason_code) {
2680         case_WLAN(UNSPECIFIED);
2681         case_WLAN(PREV_AUTH_NOT_VALID);
2682         case_WLAN(DEAUTH_LEAVING);
2683         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2684         case_WLAN(DISASSOC_AP_BUSY);
2685         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2686         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2687         case_WLAN(DISASSOC_STA_HAS_LEFT);
2688         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2689         case_WLAN(DISASSOC_BAD_POWER);
2690         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2691         case_WLAN(INVALID_IE);
2692         case_WLAN(MIC_FAILURE);
2693         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2694         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2695         case_WLAN(IE_DIFFERENT);
2696         case_WLAN(INVALID_GROUP_CIPHER);
2697         case_WLAN(INVALID_PAIRWISE_CIPHER);
2698         case_WLAN(INVALID_AKMP);
2699         case_WLAN(UNSUPP_RSN_VERSION);
2700         case_WLAN(INVALID_RSN_IE_CAP);
2701         case_WLAN(IEEE8021X_FAILED);
2702         case_WLAN(CIPHER_SUITE_REJECTED);
2703         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2704         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2705         case_WLAN(DISASSOC_LOW_ACK);
2706         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2707         case_WLAN(QSTA_LEAVE_QBSS);
2708         case_WLAN(QSTA_NOT_USE);
2709         case_WLAN(QSTA_REQUIRE_SETUP);
2710         case_WLAN(QSTA_TIMEOUT);
2711         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2712         case_WLAN(MESH_PEER_CANCELED);
2713         case_WLAN(MESH_MAX_PEERS);
2714         case_WLAN(MESH_CONFIG);
2715         case_WLAN(MESH_CLOSE);
2716         case_WLAN(MESH_MAX_RETRIES);
2717         case_WLAN(MESH_CONFIRM_TIMEOUT);
2718         case_WLAN(MESH_INVALID_GTK);
2719         case_WLAN(MESH_INCONSISTENT_PARAM);
2720         case_WLAN(MESH_INVALID_SECURITY);
2721         case_WLAN(MESH_PATH_ERROR);
2722         case_WLAN(MESH_PATH_NOFORWARD);
2723         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2724         case_WLAN(MAC_EXISTS_IN_MBSS);
2725         case_WLAN(MESH_CHAN_REGULATORY);
2726         case_WLAN(MESH_CHAN);
2727         default: return "<unknown>";
2728         }
2729 }
2730
2731 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2732                                      struct ieee80211_mgmt *mgmt, size_t len)
2733 {
2734         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2735         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2736
2737         sdata_assert_lock(sdata);
2738
2739         if (len < 24 + 2)
2740                 return;
2741
2742         if (ifmgd->associated &&
2743             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2744                 const u8 *bssid = ifmgd->associated->bssid;
2745
2746                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2747                            bssid, reason_code,
2748                            ieee80211_get_reason_code_string(reason_code));
2749
2750                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2751
2752                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2753                                             reason_code);
2754                 return;
2755         }
2756
2757         if (ifmgd->assoc_data &&
2758             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2759                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2760
2761                 sdata_info(sdata,
2762                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2763                            bssid, reason_code,
2764                            ieee80211_get_reason_code_string(reason_code));
2765
2766                 ieee80211_destroy_assoc_data(sdata, false);
2767
2768                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2769                 return;
2770         }
2771 }
2772
2773
2774 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2775                                        struct ieee80211_mgmt *mgmt, size_t len)
2776 {
2777         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2778         u16 reason_code;
2779
2780         sdata_assert_lock(sdata);
2781
2782         if (len < 24 + 2)
2783                 return;
2784
2785         if (!ifmgd->associated ||
2786             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2787                 return;
2788
2789         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2790
2791         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2792                    mgmt->sa, reason_code);
2793
2794         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2795
2796         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2797 }
2798
2799 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2800                                 u8 *supp_rates, unsigned int supp_rates_len,
2801                                 u32 *rates, u32 *basic_rates,
2802                                 bool *have_higher_than_11mbit,
2803                                 int *min_rate, int *min_rate_index,
2804                                 int shift, u32 rate_flags)
2805 {
2806         int i, j;
2807
2808         for (i = 0; i < supp_rates_len; i++) {
2809                 int rate = supp_rates[i] & 0x7f;
2810                 bool is_basic = !!(supp_rates[i] & 0x80);
2811
2812                 if ((rate * 5 * (1 << shift)) > 110)
2813                         *have_higher_than_11mbit = true;
2814
2815                 /*
2816                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2817                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2818                  *
2819                  * Note: Even through the membership selector and the basic
2820                  *       rate flag share the same bit, they are not exactly
2821                  *       the same.
2822                  */
2823                 if (!!(supp_rates[i] & 0x80) &&
2824                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2825                         continue;
2826
2827                 for (j = 0; j < sband->n_bitrates; j++) {
2828                         struct ieee80211_rate *br;
2829                         int brate;
2830
2831                         br = &sband->bitrates[j];
2832                         if ((rate_flags & br->flags) != rate_flags)
2833                                 continue;
2834
2835                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2836                         if (brate == rate) {
2837                                 *rates |= BIT(j);
2838                                 if (is_basic)
2839                                         *basic_rates |= BIT(j);
2840                                 if ((rate * 5) < *min_rate) {
2841                                         *min_rate = rate * 5;
2842                                         *min_rate_index = j;
2843                                 }
2844                                 break;
2845                         }
2846                 }
2847         }
2848 }
2849
2850 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2851                                     struct cfg80211_bss *cbss,
2852                                     struct ieee80211_mgmt *mgmt, size_t len)
2853 {
2854         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2855         struct ieee80211_local *local = sdata->local;
2856         struct ieee80211_supported_band *sband;
2857         struct sta_info *sta;
2858         u8 *pos;
2859         u16 capab_info, aid;
2860         struct ieee802_11_elems elems;
2861         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2862         const struct cfg80211_bss_ies *bss_ies = NULL;
2863         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2864         u32 changed = 0;
2865         int err;
2866         bool ret;
2867
2868         /* AssocResp and ReassocResp have identical structure */
2869
2870         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2871         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2872
2873         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2874                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2875                            aid);
2876         aid &= ~(BIT(15) | BIT(14));
2877
2878         ifmgd->broken_ap = false;
2879
2880         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2881                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2882                            aid);
2883                 aid = 0;
2884                 ifmgd->broken_ap = true;
2885         }
2886
2887         pos = mgmt->u.assoc_resp.variable;
2888         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2889
2890         if (!elems.supp_rates) {
2891                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2892                 return false;
2893         }
2894
2895         ifmgd->aid = aid;
2896         ifmgd->tdls_chan_switch_prohibited =
2897                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2898                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2899
2900         /*
2901          * Some APs are erroneously not including some information in their
2902          * (re)association response frames. Try to recover by using the data
2903          * from the beacon or probe response. This seems to afflict mobile
2904          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2905          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2906          */
2907         if ((assoc_data->wmm && !elems.wmm_param) ||
2908             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2909              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2910             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2911              (!elems.vht_cap_elem || !elems.vht_operation))) {
2912                 const struct cfg80211_bss_ies *ies;
2913                 struct ieee802_11_elems bss_elems;
2914
2915                 rcu_read_lock();
2916                 ies = rcu_dereference(cbss->ies);
2917                 if (ies)
2918                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2919                                           GFP_ATOMIC);
2920                 rcu_read_unlock();
2921                 if (!bss_ies)
2922                         return false;
2923
2924                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2925                                        false, &bss_elems);
2926                 if (assoc_data->wmm &&
2927                     !elems.wmm_param && bss_elems.wmm_param) {
2928                         elems.wmm_param = bss_elems.wmm_param;
2929                         sdata_info(sdata,
2930                                    "AP bug: WMM param missing from AssocResp\n");
2931                 }
2932
2933                 /*
2934                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2935                  * have to include the IEs in the (re)association response.
2936                  */
2937                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2938                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2939                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2940                         sdata_info(sdata,
2941                                    "AP bug: HT capability missing from AssocResp\n");
2942                 }
2943                 if (!elems.ht_operation && bss_elems.ht_operation &&
2944                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2945                         elems.ht_operation = bss_elems.ht_operation;
2946                         sdata_info(sdata,
2947                                    "AP bug: HT operation missing from AssocResp\n");
2948                 }
2949                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2950                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2951                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2952                         sdata_info(sdata,
2953                                    "AP bug: VHT capa missing from AssocResp\n");
2954                 }
2955                 if (!elems.vht_operation && bss_elems.vht_operation &&
2956                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2957                         elems.vht_operation = bss_elems.vht_operation;
2958                         sdata_info(sdata,
2959                                    "AP bug: VHT operation missing from AssocResp\n");
2960                 }
2961         }
2962
2963         /*
2964          * We previously checked these in the beacon/probe response, so
2965          * they should be present here. This is just a safety net.
2966          */
2967         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2968             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2969                 sdata_info(sdata,
2970                            "HT AP is missing WMM params or HT capability/operation\n");
2971                 ret = false;
2972                 goto out;
2973         }
2974
2975         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2976             (!elems.vht_cap_elem || !elems.vht_operation)) {
2977                 sdata_info(sdata,
2978                            "VHT AP is missing VHT capability/operation\n");
2979                 ret = false;
2980                 goto out;
2981         }
2982
2983         mutex_lock(&sdata->local->sta_mtx);
2984         /*
2985          * station info was already allocated and inserted before
2986          * the association and should be available to us
2987          */
2988         sta = sta_info_get(sdata, cbss->bssid);
2989         if (WARN_ON(!sta)) {
2990                 mutex_unlock(&sdata->local->sta_mtx);
2991                 ret = false;
2992                 goto out;
2993         }
2994
2995         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2996
2997         /* Set up internal HT/VHT capabilities */
2998         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2999                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3000                                                   elems.ht_cap_elem, sta);
3001
3002         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3003                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3004                                                     elems.vht_cap_elem, sta);
3005
3006         /*
3007          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3008          * in their association response, so ignore that data for our own
3009          * configuration. If it changed since the last beacon, we'll get the
3010          * next beacon and update then.
3011          */
3012
3013         /*
3014          * If an operating mode notification IE is present, override the
3015          * NSS calculation (that would be done in rate_control_rate_init())
3016          * and use the # of streams from that element.
3017          */
3018         if (elems.opmode_notif &&
3019             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3020                 u8 nss;
3021
3022                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3023                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3024                 nss += 1;
3025                 sta->sta.rx_nss = nss;
3026         }
3027
3028         rate_control_rate_init(sta);
3029
3030         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3031                 set_sta_flag(sta, WLAN_STA_MFP);
3032                 sta->sta.mfp = true;
3033         } else {
3034                 sta->sta.mfp = false;
3035         }
3036
3037         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3038
3039         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3040         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3041                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3042         if (err) {
3043                 sdata_info(sdata,
3044                            "failed to move station %pM to desired state\n",
3045                            sta->sta.addr);
3046                 WARN_ON(__sta_info_destroy(sta));
3047                 mutex_unlock(&sdata->local->sta_mtx);
3048                 ret = false;
3049                 goto out;
3050         }
3051
3052         mutex_unlock(&sdata->local->sta_mtx);
3053
3054         /*
3055          * Always handle WMM once after association regardless
3056          * of the first value the AP uses. Setting -1 here has
3057          * that effect because the AP values is an unsigned
3058          * 4-bit value.
3059          */
3060         ifmgd->wmm_last_param_set = -1;
3061
3062         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3063                 ieee80211_set_wmm_default(sdata, false, false);
3064         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3065                                              elems.wmm_param_len)) {
3066                 /* still enable QoS since we might have HT/VHT */
3067                 ieee80211_set_wmm_default(sdata, false, true);
3068                 /* set the disable-WMM flag in this case to disable
3069                  * tracking WMM parameter changes in the beacon if
3070                  * the parameters weren't actually valid. Doing so
3071                  * avoids changing parameters very strangely when
3072                  * the AP is going back and forth between valid and
3073                  * invalid parameters.
3074                  */
3075                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3076         }
3077         changed |= BSS_CHANGED_QOS;
3078
3079         /* set AID and assoc capability,
3080          * ieee80211_set_associated() will tell the driver */
3081         bss_conf->aid = aid;
3082         bss_conf->assoc_capability = capab_info;
3083         ieee80211_set_associated(sdata, cbss, changed);
3084
3085         /*
3086          * If we're using 4-addr mode, let the AP know that we're
3087          * doing so, so that it can create the STA VLAN on its side
3088          */
3089         if (ifmgd->use_4addr)
3090                 ieee80211_send_4addr_nullfunc(local, sdata);
3091
3092         /*
3093          * Start timer to probe the connection to the AP now.
3094          * Also start the timer that will detect beacon loss.
3095          */
3096         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3097         ieee80211_sta_reset_beacon_monitor(sdata);
3098
3099         ret = true;
3100  out:
3101         kfree(bss_ies);
3102         return ret;
3103 }
3104
3105 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3106                                          struct ieee80211_mgmt *mgmt,
3107                                          size_t len)
3108 {
3109         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3110         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3111         u16 capab_info, status_code, aid;
3112         struct ieee802_11_elems elems;
3113         int ac, uapsd_queues = -1;
3114         u8 *pos;
3115         bool reassoc;
3116         struct cfg80211_bss *bss;
3117         struct ieee80211_event event = {
3118                 .type = MLME_EVENT,
3119                 .u.mlme.data = ASSOC_EVENT,
3120         };
3121
3122         sdata_assert_lock(sdata);
3123
3124         if (!assoc_data)
3125                 return;
3126         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3127                 return;
3128
3129         /*
3130          * AssocResp and ReassocResp have identical structure, so process both
3131          * of them in this function.
3132          */
3133
3134         if (len < 24 + 6)
3135                 return;
3136
3137         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3138         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3139         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3140         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3141
3142         sdata_info(sdata,
3143                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3144                    reassoc ? "Rea" : "A", mgmt->sa,
3145                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3146
3147         pos = mgmt->u.assoc_resp.variable;
3148         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3149
3150         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3151             elems.timeout_int &&
3152             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3153                 u32 tu, ms;
3154                 tu = le32_to_cpu(elems.timeout_int->value);
3155                 ms = tu * 1024 / 1000;
3156                 sdata_info(sdata,
3157                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3158                            mgmt->sa, tu, ms);
3159                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3160                 assoc_data->timeout_started = true;
3161                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3162                         run_again(sdata, assoc_data->timeout);
3163                 return;
3164         }
3165
3166         bss = assoc_data->bss;
3167
3168         if (status_code != WLAN_STATUS_SUCCESS) {
3169                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3170                            mgmt->sa, status_code);
3171                 ieee80211_destroy_assoc_data(sdata, false);
3172                 event.u.mlme.status = MLME_DENIED;
3173                 event.u.mlme.reason = status_code;
3174                 drv_event_callback(sdata->local, sdata, &event);
3175         } else {
3176                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3177                         /* oops -- internal error -- send timeout for now */
3178                         ieee80211_destroy_assoc_data(sdata, false);
3179                         cfg80211_assoc_timeout(sdata->dev, bss);
3180                         return;
3181                 }
3182                 event.u.mlme.status = MLME_SUCCESS;
3183                 drv_event_callback(sdata->local, sdata, &event);
3184                 sdata_info(sdata, "associated\n");
3185
3186                 /*
3187                  * destroy assoc_data afterwards, as otherwise an idle
3188                  * recalc after assoc_data is NULL but before associated
3189                  * is set can cause the interface to go idle
3190                  */
3191                 ieee80211_destroy_assoc_data(sdata, true);
3192
3193                 /* get uapsd queues configuration */
3194                 uapsd_queues = 0;
3195                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3196                         if (sdata->tx_conf[ac].uapsd)
3197                                 uapsd_queues |= BIT(ac);
3198         }
3199
3200         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3201 }
3202
3203 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3204                                   struct ieee80211_mgmt *mgmt, size_t len,
3205                                   struct ieee80211_rx_status *rx_status,
3206                                   struct ieee802_11_elems *elems)
3207 {
3208         struct ieee80211_local *local = sdata->local;
3209         struct ieee80211_bss *bss;
3210         struct ieee80211_channel *channel;
3211
3212         sdata_assert_lock(sdata);
3213
3214         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3215         if (!channel)
3216                 return;
3217
3218         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3219                                         channel);
3220         if (bss) {
3221                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3222                 ieee80211_rx_bss_put(local, bss);
3223         }
3224 }
3225
3226
3227 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3228                                          struct sk_buff *skb)
3229 {
3230         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3231         struct ieee80211_if_managed *ifmgd;
3232         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3233         size_t baselen, len = skb->len;
3234         struct ieee802_11_elems elems;
3235
3236         ifmgd = &sdata->u.mgd;
3237
3238         sdata_assert_lock(sdata);
3239
3240         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3241                 return; /* ignore ProbeResp to foreign address */
3242
3243         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3244         if (baselen > len)
3245                 return;
3246
3247         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3248                                false, &elems);
3249
3250         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3251
3252         if (ifmgd->associated &&
3253             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3254                 ieee80211_reset_ap_probe(sdata);
3255 }
3256
3257 /*
3258  * This is the canonical list of information elements we care about,
3259  * the filter code also gives us all changes to the Microsoft OUI
3260  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3261  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3262  * changes to requested client power.
3263  *
3264  * We implement beacon filtering in software since that means we can
3265  * avoid processing the frame here and in cfg80211, and userspace
3266  * will not be able to tell whether the hardware supports it or not.
3267  *
3268  * XXX: This list needs to be dynamic -- userspace needs to be able to
3269  *      add items it requires. It also needs to be able to tell us to
3270  *      look out for other vendor IEs.
3271  */
3272 static const u64 care_about_ies =
3273         (1ULL << WLAN_EID_COUNTRY) |
3274         (1ULL << WLAN_EID_ERP_INFO) |
3275         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3276         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3277         (1ULL << WLAN_EID_HT_CAPABILITY) |
3278         (1ULL << WLAN_EID_HT_OPERATION) |
3279         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3280
3281 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3282                                      struct ieee80211_mgmt *mgmt, size_t len,
3283                                      struct ieee80211_rx_status *rx_status)
3284 {
3285         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3286         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3287         size_t baselen;
3288         struct ieee802_11_elems elems;
3289         struct ieee80211_local *local = sdata->local;
3290         struct ieee80211_chanctx_conf *chanctx_conf;
3291         struct ieee80211_channel *chan;
3292         struct sta_info *sta;
3293         u32 changed = 0;
3294         bool erp_valid;
3295         u8 erp_value = 0;
3296         u32 ncrc;
3297         u8 *bssid;
3298         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3299
3300         sdata_assert_lock(sdata);
3301
3302         /* Process beacon from the current BSS */
3303         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3304         if (baselen > len)
3305                 return;
3306
3307         rcu_read_lock();
3308         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3309         if (!chanctx_conf) {
3310                 rcu_read_unlock();
3311                 return;
3312         }
3313
3314         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3315                 rcu_read_unlock();
3316                 return;
3317         }
3318         chan = chanctx_conf->def.chan;
3319         rcu_read_unlock();
3320
3321         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3322             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3323                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3324                                        len - baselen, false, &elems);
3325
3326                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3327                 if (elems.tim && !elems.parse_error) {
3328                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3329                         ifmgd->dtim_period = tim_ie->dtim_period;
3330                 }
3331                 ifmgd->have_beacon = true;
3332                 ifmgd->assoc_data->need_beacon = false;
3333                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3334                         sdata->vif.bss_conf.sync_tsf =
3335                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3336                         sdata->vif.bss_conf.sync_device_ts =
3337                                 rx_status->device_timestamp;
3338                         if (elems.tim)
3339                                 sdata->vif.bss_conf.sync_dtim_count =
3340                                         elems.tim->dtim_count;
3341                         else
3342                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3343                 }
3344                 /* continue assoc process */
3345                 ifmgd->assoc_data->timeout = jiffies;
3346                 ifmgd->assoc_data->timeout_started = true;
3347                 run_again(sdata, ifmgd->assoc_data->timeout);
3348                 return;
3349         }
3350
3351         if (!ifmgd->associated ||
3352             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3353                 return;
3354         bssid = ifmgd->associated->bssid;
3355
3356         /* Track average RSSI from the Beacon frames of the current AP */
3357         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3358                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3359                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3360                 ifmgd->last_cqm_event_signal = 0;
3361                 ifmgd->count_beacon_signal = 1;
3362                 ifmgd->last_ave_beacon_signal = 0;
3363         } else {
3364                 ifmgd->count_beacon_signal++;
3365         }
3366
3367         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3368
3369         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3370             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3371                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3372                 int last_sig = ifmgd->last_ave_beacon_signal;
3373                 struct ieee80211_event event = {
3374                         .type = RSSI_EVENT,
3375                 };
3376
3377                 /*
3378                  * if signal crosses either of the boundaries, invoke callback
3379                  * with appropriate parameters
3380                  */
3381                 if (sig > ifmgd->rssi_max_thold &&
3382                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3383                         ifmgd->last_ave_beacon_signal = sig;
3384                         event.u.rssi.data = RSSI_EVENT_HIGH;
3385                         drv_event_callback(local, sdata, &event);
3386                 } else if (sig < ifmgd->rssi_min_thold &&
3387                            (last_sig >= ifmgd->rssi_max_thold ||
3388                            last_sig == 0)) {
3389                         ifmgd->last_ave_beacon_signal = sig;
3390                         event.u.rssi.data = RSSI_EVENT_LOW;
3391                         drv_event_callback(local, sdata, &event);
3392                 }
3393         }
3394
3395         if (bss_conf->cqm_rssi_thold &&
3396             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3397             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3398                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3399                 int last_event = ifmgd->last_cqm_event_signal;
3400                 int thold = bss_conf->cqm_rssi_thold;
3401                 int hyst = bss_conf->cqm_rssi_hyst;
3402
3403                 if (sig < thold &&
3404                     (last_event == 0 || sig < last_event - hyst)) {
3405                         ifmgd->last_cqm_event_signal = sig;
3406                         ieee80211_cqm_rssi_notify(
3407                                 &sdata->vif,
3408                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3409                                 GFP_KERNEL);
3410                 } else if (sig > thold &&
3411                            (last_event == 0 || sig > last_event + hyst)) {
3412                         ifmgd->last_cqm_event_signal = sig;
3413                         ieee80211_cqm_rssi_notify(
3414                                 &sdata->vif,
3415                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3416                                 GFP_KERNEL);
3417                 }
3418         }
3419
3420         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3421                 mlme_dbg_ratelimited(sdata,
3422                                      "cancelling AP probe due to a received beacon\n");
3423                 ieee80211_reset_ap_probe(sdata);
3424         }
3425
3426         /*
3427          * Push the beacon loss detection into the future since
3428          * we are processing a beacon from the AP just now.
3429          */
3430         ieee80211_sta_reset_beacon_monitor(sdata);
3431
3432         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3433         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3434                                           len - baselen, false, &elems,
3435                                           care_about_ies, ncrc);
3436
3437         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3438             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3439                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3440                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3441                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3442                                 ieee80211_hw_config(local,
3443                                                     IEEE80211_CONF_CHANGE_PS);
3444                         }
3445                         ieee80211_send_nullfunc(local, sdata, false);
3446                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3447                         local->pspolling = true;
3448
3449                         /*
3450                          * Here is assumed that the driver will be
3451                          * able to send ps-poll frame and receive a
3452                          * response even though power save mode is
3453                          * enabled, but some drivers might require
3454                          * to disable power save here. This needs
3455                          * to be investigated.
3456                          */
3457                         ieee80211_send_pspoll(local, sdata);
3458                 }
3459         }
3460
3461         if (sdata->vif.p2p) {
3462                 struct ieee80211_p2p_noa_attr noa = {};
3463                 int ret;
3464
3465                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3466                                             len - baselen,
3467                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3468                                             (u8 *) &noa, sizeof(noa));
3469                 if (ret >= 2) {
3470                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3471                                 /* valid noa_attr and index changed */
3472                                 sdata->u.mgd.p2p_noa_index = noa.index;
3473                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3474                                 changed |= BSS_CHANGED_P2P_PS;
3475                                 /*
3476                                  * make sure we update all information, the CRC
3477                                  * mechanism doesn't look at P2P attributes.
3478                                  */
3479                                 ifmgd->beacon_crc_valid = false;
3480                         }
3481                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3482                         /* noa_attr not found and we had valid noa_attr before */
3483                         sdata->u.mgd.p2p_noa_index = -1;
3484                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3485                         changed |= BSS_CHANGED_P2P_PS;
3486                         ifmgd->beacon_crc_valid = false;
3487                 }
3488         }
3489
3490         if (ifmgd->csa_waiting_bcn)
3491                 ieee80211_chswitch_post_beacon(sdata);
3492
3493         /*
3494          * Update beacon timing and dtim count on every beacon appearance. This
3495          * will allow the driver to use the most updated values. Do it before
3496          * comparing this one with last received beacon.
3497          * IMPORTANT: These parameters would possibly be out of sync by the time
3498          * the driver will use them. The synchronized view is currently
3499          * guaranteed only in certain callbacks.
3500          */
3501         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3502                 sdata->vif.bss_conf.sync_tsf =
3503                         le64_to_cpu(mgmt->u.beacon.timestamp);
3504                 sdata->vif.bss_conf.sync_device_ts =
3505                         rx_status->device_timestamp;
3506                 if (elems.tim)
3507                         sdata->vif.bss_conf.sync_dtim_count =
3508                                 elems.tim->dtim_count;
3509                 else
3510                         sdata->vif.bss_conf.sync_dtim_count = 0;
3511         }
3512
3513         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3514                 return;
3515         ifmgd->beacon_crc = ncrc;
3516         ifmgd->beacon_crc_valid = true;
3517
3518         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3519
3520         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3521                                          rx_status->device_timestamp,
3522                                          &elems, true);
3523
3524         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3525             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3526                                      elems.wmm_param_len))
3527                 changed |= BSS_CHANGED_QOS;
3528
3529         /*
3530          * If we haven't had a beacon before, tell the driver about the
3531          * DTIM period (and beacon timing if desired) now.
3532          */
3533         if (!ifmgd->have_beacon) {
3534                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3535                 if (elems.tim)
3536                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3537                 else
3538                         bss_conf->dtim_period = 1;
3539
3540                 changed |= BSS_CHANGED_BEACON_INFO;
3541                 ifmgd->have_beacon = true;
3542
3543                 mutex_lock(&local->iflist_mtx);
3544                 ieee80211_recalc_ps(local);
3545                 mutex_unlock(&local->iflist_mtx);
3546
3547                 ieee80211_recalc_ps_vif(sdata);
3548         }
3549
3550         if (elems.erp_info) {
3551                 erp_valid = true;
3552                 erp_value = elems.erp_info[0];
3553         } else {
3554                 erp_valid = false;
3555         }
3556         changed |= ieee80211_handle_bss_capability(sdata,
3557                         le16_to_cpu(mgmt->u.beacon.capab_info),
3558                         erp_valid, erp_value);
3559
3560         mutex_lock(&local->sta_mtx);
3561         sta = sta_info_get(sdata, bssid);
3562
3563         if (ieee80211_config_bw(sdata, sta,
3564                                 elems.ht_cap_elem, elems.ht_operation,
3565                                 elems.vht_operation, bssid, &changed)) {
3566                 mutex_unlock(&local->sta_mtx);
3567                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3568                                        WLAN_REASON_DEAUTH_LEAVING,
3569                                        true, deauth_buf);
3570                 ieee80211_report_disconnect(sdata, deauth_buf,
3571                                             sizeof(deauth_buf), true,
3572                                             WLAN_REASON_DEAUTH_LEAVING);
3573                 return;
3574         }
3575
3576         if (sta && elems.opmode_notif)
3577                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3578                                             rx_status->band, true);
3579         mutex_unlock(&local->sta_mtx);
3580
3581         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3582                                                elems.country_elem,
3583                                                elems.country_elem_len,
3584                                                elems.pwr_constr_elem,
3585                                                elems.cisco_dtpc_elem);
3586
3587         ieee80211_bss_info_change_notify(sdata, changed);
3588 }
3589
3590 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3591                                   struct sk_buff *skb)
3592 {
3593         struct ieee80211_rx_status *rx_status;
3594         struct ieee80211_mgmt *mgmt;
3595         u16 fc;
3596         struct ieee802_11_elems elems;
3597         int ies_len;
3598
3599         rx_status = (struct ieee80211_rx_status *) skb->cb;
3600         mgmt = (struct ieee80211_mgmt *) skb->data;
3601         fc = le16_to_cpu(mgmt->frame_control);
3602
3603         sdata_lock(sdata);
3604
3605         switch (fc & IEEE80211_FCTL_STYPE) {
3606         case IEEE80211_STYPE_BEACON:
3607                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3608                 break;
3609         case IEEE80211_STYPE_PROBE_RESP:
3610                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3611                 break;
3612         case IEEE80211_STYPE_AUTH:
3613                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3614                 break;
3615         case IEEE80211_STYPE_DEAUTH:
3616                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3617                 break;
3618         case IEEE80211_STYPE_DISASSOC:
3619                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3620                 break;
3621         case IEEE80211_STYPE_ASSOC_RESP:
3622         case IEEE80211_STYPE_REASSOC_RESP:
3623                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3624                 break;
3625         case IEEE80211_STYPE_ACTION:
3626                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3627                         ies_len = skb->len -
3628                                   offsetof(struct ieee80211_mgmt,
3629                                            u.action.u.chan_switch.variable);
3630
3631                         if (ies_len < 0)
3632                                 break;
3633
3634                         ieee802_11_parse_elems(
3635                                 mgmt->u.action.u.chan_switch.variable,
3636                                 ies_len, true, &elems);
3637
3638                         if (elems.parse_error)
3639                                 break;
3640
3641                         ieee80211_sta_process_chanswitch(sdata,
3642                                                  rx_status->mactime,
3643                                                  rx_status->device_timestamp,
3644                                                  &elems, false);
3645                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3646                         ies_len = skb->len -
3647                                   offsetof(struct ieee80211_mgmt,
3648                                            u.action.u.ext_chan_switch.variable);
3649
3650                         if (ies_len < 0)
3651                                 break;
3652
3653                         ieee802_11_parse_elems(
3654                                 mgmt->u.action.u.ext_chan_switch.variable,
3655                                 ies_len, true, &elems);
3656
3657                         if (elems.parse_error)
3658                                 break;
3659
3660                         /* for the handling code pretend this was also an IE */
3661                         elems.ext_chansw_ie =
3662                                 &mgmt->u.action.u.ext_chan_switch.data;
3663
3664                         ieee80211_sta_process_chanswitch(sdata,
3665                                                  rx_status->mactime,
3666                                                  rx_status->device_timestamp,
3667                                                  &elems, false);
3668                 }
3669                 break;
3670         }
3671         sdata_unlock(sdata);
3672 }
3673
3674 static void ieee80211_sta_timer(unsigned long data)
3675 {
3676         struct ieee80211_sub_if_data *sdata =
3677                 (struct ieee80211_sub_if_data *) data;
3678
3679         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3680 }
3681
3682 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3683                                           u8 *bssid, u8 reason, bool tx)
3684 {
3685         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3686
3687         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3688                                tx, frame_buf);
3689
3690         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3691                                     reason);
3692 }
3693
3694 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3695 {
3696         struct ieee80211_local *local = sdata->local;
3697         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3698         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3699         u32 tx_flags = 0;
3700         u16 trans = 1;
3701         u16 status = 0;
3702
3703         sdata_assert_lock(sdata);
3704
3705         if (WARN_ON_ONCE(!auth_data))
3706                 return -EINVAL;
3707
3708         auth_data->tries++;
3709
3710         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3711                 sdata_info(sdata, "authentication with %pM timed out\n",
3712                            auth_data->bss->bssid);
3713
3714                 /*
3715                  * Most likely AP is not in the range so remove the
3716                  * bss struct for that AP.
3717                  */
3718                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3719
3720                 return -ETIMEDOUT;
3721         }
3722
3723         drv_mgd_prepare_tx(local, sdata);
3724
3725         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3726                    auth_data->bss->bssid, auth_data->tries,
3727                    IEEE80211_AUTH_MAX_TRIES);
3728
3729         auth_data->expected_transaction = 2;
3730
3731         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3732                 trans = auth_data->sae_trans;
3733                 status = auth_data->sae_status;
3734                 auth_data->expected_transaction = trans;
3735         }
3736
3737         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3738                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3739                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3740
3741         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3742                             auth_data->data, auth_data->data_len,
3743                             auth_data->bss->bssid,
3744                             auth_data->bss->bssid, NULL, 0, 0,
3745                             tx_flags);
3746
3747         if (tx_flags == 0) {
3748                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3749                 auth_data->timeout_started = true;
3750                 run_again(sdata, auth_data->timeout);
3751         } else {
3752                 auth_data->timeout =
3753                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3754                 auth_data->timeout_started = true;
3755                 run_again(sdata, auth_data->timeout);
3756         }
3757
3758         return 0;
3759 }
3760
3761 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3762 {
3763         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3764         struct ieee80211_local *local = sdata->local;
3765
3766         sdata_assert_lock(sdata);
3767
3768         assoc_data->tries++;
3769         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3770                 sdata_info(sdata, "association with %pM timed out\n",
3771                            assoc_data->bss->bssid);
3772
3773                 /*
3774                  * Most likely AP is not in the range so remove the
3775                  * bss struct for that AP.
3776                  */
3777                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3778
3779                 return -ETIMEDOUT;
3780         }
3781
3782         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3783                    assoc_data->bss->bssid, assoc_data->tries,
3784                    IEEE80211_ASSOC_MAX_TRIES);
3785         ieee80211_send_assoc(sdata);
3786
3787         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3788                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3789                 assoc_data->timeout_started = true;
3790                 run_again(sdata, assoc_data->timeout);
3791         } else {
3792                 assoc_data->timeout =
3793                         round_jiffies_up(jiffies +
3794                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3795                 assoc_data->timeout_started = true;
3796                 run_again(sdata, assoc_data->timeout);
3797         }
3798
3799         return 0;
3800 }
3801
3802 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3803                                   __le16 fc, bool acked)
3804 {
3805         struct ieee80211_local *local = sdata->local;
3806
3807         sdata->u.mgd.status_fc = fc;
3808         sdata->u.mgd.status_acked = acked;
3809         sdata->u.mgd.status_received = true;
3810
3811         ieee80211_queue_work(&local->hw, &sdata->work);
3812 }
3813
3814 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3815 {
3816         struct ieee80211_local *local = sdata->local;
3817         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3818
3819         sdata_lock(sdata);
3820
3821         if (ifmgd->status_received) {
3822                 __le16 fc = ifmgd->status_fc;
3823                 bool status_acked = ifmgd->status_acked;
3824
3825                 ifmgd->status_received = false;
3826                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3827                         if (status_acked) {
3828                                 ifmgd->auth_data->timeout =
3829                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3830                                 run_again(sdata, ifmgd->auth_data->timeout);
3831                         } else {
3832                                 ifmgd->auth_data->timeout = jiffies - 1;
3833                         }
3834                         ifmgd->auth_data->timeout_started = true;
3835                 } else if (ifmgd->assoc_data &&
3836                            (ieee80211_is_assoc_req(fc) ||
3837                             ieee80211_is_reassoc_req(fc))) {
3838                         if (status_acked) {
3839                                 ifmgd->assoc_data->timeout =
3840                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3841                                 run_again(sdata, ifmgd->assoc_data->timeout);
3842                         } else {
3843                                 ifmgd->assoc_data->timeout = jiffies - 1;
3844                         }
3845                         ifmgd->assoc_data->timeout_started = true;
3846                 }
3847         }
3848
3849         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3850             time_after(jiffies, ifmgd->auth_data->timeout)) {
3851                 if (ifmgd->auth_data->done) {
3852                         /*
3853                          * ok ... we waited for assoc but userspace didn't,
3854                          * so let's just kill the auth data
3855                          */
3856                         ieee80211_destroy_auth_data(sdata, false);
3857                 } else if (ieee80211_auth(sdata)) {
3858                         u8 bssid[ETH_ALEN];
3859                         struct ieee80211_event event = {
3860                                 .type = MLME_EVENT,
3861                                 .u.mlme.data = AUTH_EVENT,
3862                                 .u.mlme.status = MLME_TIMEOUT,
3863                         };
3864
3865                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3866
3867                         ieee80211_destroy_auth_data(sdata, false);
3868
3869                         cfg80211_auth_timeout(sdata->dev, bssid);
3870                         drv_event_callback(sdata->local, sdata, &event);
3871                 }
3872         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3873                 run_again(sdata, ifmgd->auth_data->timeout);
3874
3875         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3876             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3877                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3878                     ieee80211_do_assoc(sdata)) {
3879                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3880                         struct ieee80211_event event = {
3881                                 .type = MLME_EVENT,
3882                                 .u.mlme.data = ASSOC_EVENT,
3883                                 .u.mlme.status = MLME_TIMEOUT,
3884                         };
3885
3886                         ieee80211_destroy_assoc_data(sdata, false);
3887                         cfg80211_assoc_timeout(sdata->dev, bss);
3888                         drv_event_callback(sdata->local, sdata, &event);
3889                 }
3890         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3891                 run_again(sdata, ifmgd->assoc_data->timeout);
3892
3893         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3894             ifmgd->associated) {
3895                 u8 bssid[ETH_ALEN];
3896                 int max_tries;
3897
3898                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3899
3900                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3901                         max_tries = max_nullfunc_tries;
3902                 else
3903                         max_tries = max_probe_tries;
3904
3905                 /* ACK received for nullfunc probing frame */
3906                 if (!ifmgd->probe_send_count)
3907                         ieee80211_reset_ap_probe(sdata);
3908                 else if (ifmgd->nullfunc_failed) {
3909                         if (ifmgd->probe_send_count < max_tries) {
3910                                 mlme_dbg(sdata,
3911                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3912                                          bssid, ifmgd->probe_send_count,
3913                                          max_tries);
3914                                 ieee80211_mgd_probe_ap_send(sdata);
3915                         } else {
3916                                 mlme_dbg(sdata,
3917                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3918                                          bssid);
3919                                 ieee80211_sta_connection_lost(sdata, bssid,
3920                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3921                                         false);
3922                         }
3923                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3924                         run_again(sdata, ifmgd->probe_timeout);
3925                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3926                         mlme_dbg(sdata,
3927                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3928                                  bssid, probe_wait_ms);
3929                         ieee80211_sta_connection_lost(sdata, bssid,
3930                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3931                 } else if (ifmgd->probe_send_count < max_tries) {
3932                         mlme_dbg(sdata,
3933                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3934                                  bssid, probe_wait_ms,
3935                                  ifmgd->probe_send_count, max_tries);
3936                         ieee80211_mgd_probe_ap_send(sdata);
3937                 } else {
3938                         /*
3939                          * We actually lost the connection ... or did we?
3940                          * Let's make sure!
3941                          */
3942                         wiphy_debug(local->hw.wiphy,
3943                                     "%s: No probe response from AP %pM"
3944                                     " after %dms, disconnecting.\n",
3945                                     sdata->name,
3946                                     bssid, probe_wait_ms);
3947
3948                         ieee80211_sta_connection_lost(sdata, bssid,
3949                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3950                 }
3951         }
3952
3953         sdata_unlock(sdata);
3954 }
3955
3956 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3957 {
3958         struct ieee80211_sub_if_data *sdata =
3959                 (struct ieee80211_sub_if_data *) data;
3960         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3961
3962         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3963                 return;
3964
3965         sdata->u.mgd.connection_loss = false;
3966         ieee80211_queue_work(&sdata->local->hw,
3967                              &sdata->u.mgd.beacon_connection_loss_work);
3968 }
3969
3970 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3971 {
3972         struct ieee80211_sub_if_data *sdata =
3973                 (struct ieee80211_sub_if_data *) data;
3974         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3975         struct ieee80211_local *local = sdata->local;
3976
3977         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3978                 return;
3979
3980         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3981 }
3982
3983 static void ieee80211_sta_monitor_work(struct work_struct *work)
3984 {
3985         struct ieee80211_sub_if_data *sdata =
3986                 container_of(work, struct ieee80211_sub_if_data,
3987                              u.mgd.monitor_work);
3988
3989         ieee80211_mgd_probe_ap(sdata, false);
3990 }
3991
3992 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3993 {
3994         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3995                 __ieee80211_stop_poll(sdata);
3996
3997                 /* let's probe the connection once */
3998                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
3999                         ieee80211_queue_work(&sdata->local->hw,
4000                                              &sdata->u.mgd.monitor_work);
4001                 /* and do all the other regular work too */
4002                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4003         }
4004 }
4005
4006 #ifdef CONFIG_PM
4007 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4008 {
4009         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4010         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4011
4012         sdata_lock(sdata);
4013
4014         if (ifmgd->auth_data || ifmgd->assoc_data) {
4015                 const u8 *bssid = ifmgd->auth_data ?
4016                                 ifmgd->auth_data->bss->bssid :
4017                                 ifmgd->assoc_data->bss->bssid;
4018
4019                 /*
4020                  * If we are trying to authenticate / associate while suspending,
4021                  * cfg80211 won't know and won't actually abort those attempts,
4022                  * thus we need to do that ourselves.
4023                  */
4024                 ieee80211_send_deauth_disassoc(sdata, bssid,
4025                                                IEEE80211_STYPE_DEAUTH,
4026                                                WLAN_REASON_DEAUTH_LEAVING,
4027                                                false, frame_buf);
4028                 if (ifmgd->assoc_data)
4029                         ieee80211_destroy_assoc_data(sdata, false);
4030                 if (ifmgd->auth_data)
4031                         ieee80211_destroy_auth_data(sdata, false);
4032                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4033                                       IEEE80211_DEAUTH_FRAME_LEN);
4034         }
4035
4036         /* This is a bit of a hack - we should find a better and more generic
4037          * solution to this. Normally when suspending, cfg80211 will in fact
4038          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4039          * auth (not so important) or assoc (this is the problem) process.
4040          *
4041          * As a consequence, it can happen that we are in the process of both
4042          * associating and suspending, and receive an association response
4043          * after cfg80211 has checked if it needs to disconnect, but before
4044          * we actually set the flag to drop incoming frames. This will then
4045          * cause the workqueue flush to process the association response in
4046          * the suspend, resulting in a successful association just before it
4047          * tries to remove the interface from the driver, which now though
4048          * has a channel context assigned ... this results in issues.
4049          *
4050          * To work around this (for now) simply deauth here again if we're
4051          * now connected.
4052          */
4053         if (ifmgd->associated && !sdata->local->wowlan) {
4054                 u8 bssid[ETH_ALEN];
4055                 struct cfg80211_deauth_request req = {
4056                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4057                         .bssid = bssid,
4058                 };
4059
4060                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4061                 ieee80211_mgd_deauth(sdata, &req);
4062         }
4063
4064         sdata_unlock(sdata);
4065 }
4066
4067 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4068 {
4069         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4070
4071         sdata_lock(sdata);
4072         if (!ifmgd->associated) {
4073                 sdata_unlock(sdata);
4074                 return;
4075         }
4076
4077         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4078                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4079                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4080                 ieee80211_sta_connection_lost(sdata,
4081                                               ifmgd->associated->bssid,
4082                                               WLAN_REASON_UNSPECIFIED,
4083                                               true);
4084                 sdata_unlock(sdata);
4085                 return;
4086         }
4087         sdata_unlock(sdata);
4088 }
4089 #endif
4090
4091 /* interface setup */
4092 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4093 {
4094         struct ieee80211_if_managed *ifmgd;
4095
4096         ifmgd = &sdata->u.mgd;
4097         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4098         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4099         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4100                   ieee80211_beacon_connection_loss_work);
4101         INIT_WORK(&ifmgd->csa_connection_drop_work,
4102                   ieee80211_csa_connection_drop_work);
4103         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4104         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4105                           ieee80211_tdls_peer_del_work);
4106         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4107                     (unsigned long) sdata);
4108         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4109                     (unsigned long) sdata);
4110         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4111                     (unsigned long) sdata);
4112         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4113                     (unsigned long) sdata);
4114         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4115                           ieee80211_sta_handle_tspec_ac_params_wk);
4116
4117         ifmgd->flags = 0;
4118         ifmgd->powersave = sdata->wdev.ps;
4119         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4120         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4121         ifmgd->p2p_noa_index = -1;
4122
4123         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4124                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4125         else
4126                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4127
4128         /* Setup TDLS data */
4129         spin_lock_init(&ifmgd->teardown_lock);
4130         ifmgd->teardown_skb = NULL;
4131         ifmgd->orig_teardown_skb = NULL;
4132 }
4133
4134 /* scan finished notification */
4135 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4136 {
4137         struct ieee80211_sub_if_data *sdata;
4138
4139         /* Restart STA timers */
4140         rcu_read_lock();
4141         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4142                 if (ieee80211_sdata_running(sdata))
4143                         ieee80211_restart_sta_timer(sdata);
4144         }
4145         rcu_read_unlock();
4146 }
4147
4148 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4149                                      struct cfg80211_bss *cbss)
4150 {
4151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4152         const u8 *ht_cap_ie, *vht_cap_ie;
4153         const struct ieee80211_ht_cap *ht_cap;
4154         const struct ieee80211_vht_cap *vht_cap;
4155         u8 chains = 1;
4156
4157         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4158                 return chains;
4159
4160         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4161         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4162                 ht_cap = (void *)(ht_cap_ie + 2);
4163                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4164                 /*
4165                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4166                  *       "Tx Unequal Modulation Supported" fields.
4167                  */
4168         }
4169
4170         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4171                 return chains;
4172
4173         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4174         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4175                 u8 nss;
4176                 u16 tx_mcs_map;
4177
4178                 vht_cap = (void *)(vht_cap_ie + 2);
4179                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4180                 for (nss = 8; nss > 0; nss--) {
4181                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4182                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4183                                 break;
4184                 }
4185                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4186                 chains = max(chains, nss);
4187         }
4188
4189         return chains;
4190 }
4191
4192 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4193                                   struct cfg80211_bss *cbss)
4194 {
4195         struct ieee80211_local *local = sdata->local;
4196         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4197         const struct ieee80211_ht_cap *ht_cap = NULL;
4198         const struct ieee80211_ht_operation *ht_oper = NULL;
4199         const struct ieee80211_vht_operation *vht_oper = NULL;
4200         struct ieee80211_supported_band *sband;
4201         struct cfg80211_chan_def chandef;
4202         int ret;
4203         u32 i;
4204         bool have_80mhz;
4205
4206         sband = local->hw.wiphy->bands[cbss->channel->band];
4207
4208         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4209                           IEEE80211_STA_DISABLE_80P80MHZ |
4210                           IEEE80211_STA_DISABLE_160MHZ);
4211
4212         rcu_read_lock();
4213
4214         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4215             sband->ht_cap.ht_supported) {
4216                 const u8 *ht_oper_ie, *ht_cap_ie;
4217
4218                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4219                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4220                         ht_oper = (void *)(ht_oper_ie + 2);
4221
4222                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4223                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4224                         ht_cap = (void *)(ht_cap_ie + 2);
4225
4226                 if (!ht_cap) {
4227                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4228                         ht_oper = NULL;
4229                 }
4230         }
4231
4232         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4233             sband->vht_cap.vht_supported) {
4234                 const u8 *vht_oper_ie, *vht_cap;
4235
4236                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4237                                                    WLAN_EID_VHT_OPERATION);
4238                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4239                         vht_oper = (void *)(vht_oper_ie + 2);
4240                 if (vht_oper && !ht_oper) {
4241                         vht_oper = NULL;
4242                         sdata_info(sdata,
4243                                    "AP advertised VHT without HT, disabling both\n");
4244                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4245                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4246                 }
4247
4248                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4249                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4250                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4251                         vht_oper = NULL;
4252                 }
4253         }
4254
4255         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4256         have_80mhz = false;
4257         for (i = 0; i < sband->n_channels; i++) {
4258                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4259                                                 IEEE80211_CHAN_NO_80MHZ))
4260                         continue;
4261
4262                 have_80mhz = true;
4263                 break;
4264         }
4265
4266         if (!have_80mhz)
4267                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4268
4269         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4270                                                      cbss->channel,
4271                                                      ht_cap, ht_oper, vht_oper,
4272                                                      &chandef, false);
4273
4274         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4275                                       local->rx_chains);
4276
4277         rcu_read_unlock();
4278
4279         /* will change later if needed */
4280         sdata->smps_mode = IEEE80211_SMPS_OFF;
4281
4282         mutex_lock(&local->mtx);
4283         /*
4284          * If this fails (possibly due to channel context sharing
4285          * on incompatible channels, e.g. 80+80 and 160 sharing the
4286          * same control channel) try to use a smaller bandwidth.
4287          */
4288         ret = ieee80211_vif_use_channel(sdata, &chandef,
4289                                         IEEE80211_CHANCTX_SHARED);
4290
4291         /* don't downgrade for 5 and 10 MHz channels, though. */
4292         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4293             chandef.width == NL80211_CHAN_WIDTH_10)
4294                 goto out;
4295
4296         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4297                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4298                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4299                                                 IEEE80211_CHANCTX_SHARED);
4300         }
4301  out:
4302         mutex_unlock(&local->mtx);
4303         return ret;
4304 }
4305
4306 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4307                                      struct cfg80211_bss *cbss, bool assoc,
4308                                      bool override)
4309 {
4310         struct ieee80211_local *local = sdata->local;
4311         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4312         struct ieee80211_bss *bss = (void *)cbss->priv;
4313         struct sta_info *new_sta = NULL;
4314         struct ieee80211_supported_band *sband;
4315         bool have_sta = false;
4316         int err;
4317
4318         sband = local->hw.wiphy->bands[cbss->channel->band];
4319
4320         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4321                 return -EINVAL;
4322
4323         if (assoc) {
4324                 rcu_read_lock();
4325                 have_sta = sta_info_get(sdata, cbss->bssid);
4326                 rcu_read_unlock();
4327         }
4328
4329         if (!have_sta) {
4330                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4331                 if (!new_sta)
4332                         return -ENOMEM;
4333         }
4334
4335         if (new_sta || override) {
4336                 err = ieee80211_prep_channel(sdata, cbss);
4337                 if (err) {
4338                         if (new_sta)
4339                                 sta_info_free(local, new_sta);
4340                         return -EINVAL;
4341                 }
4342         }
4343
4344         if (new_sta) {
4345                 u32 rates = 0, basic_rates = 0;
4346                 bool have_higher_than_11mbit;
4347                 int min_rate = INT_MAX, min_rate_index = -1;
4348                 struct ieee80211_chanctx_conf *chanctx_conf;
4349                 const struct cfg80211_bss_ies *ies;
4350                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4351                 u32 rate_flags;
4352
4353                 rcu_read_lock();
4354                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4355                 if (WARN_ON(!chanctx_conf)) {
4356                         rcu_read_unlock();
4357                         sta_info_free(local, new_sta);
4358                         return -EINVAL;
4359                 }
4360                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4361                 rcu_read_unlock();
4362
4363                 ieee80211_get_rates(sband, bss->supp_rates,
4364                                     bss->supp_rates_len,
4365                                     &rates, &basic_rates,
4366                                     &have_higher_than_11mbit,
4367                                     &min_rate, &min_rate_index,
4368                                     shift, rate_flags);
4369
4370                 /*
4371                  * This used to be a workaround for basic rates missing
4372                  * in the association response frame. Now that we no
4373                  * longer use the basic rates from there, it probably
4374                  * doesn't happen any more, but keep the workaround so
4375                  * in case some *other* APs are buggy in different ways
4376                  * we can connect -- with a warning.
4377                  */
4378                 if (!basic_rates && min_rate_index >= 0) {
4379                         sdata_info(sdata,
4380                                    "No basic rates, using min rate instead\n");
4381                         basic_rates = BIT(min_rate_index);
4382                 }
4383
4384                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4385                 sdata->vif.bss_conf.basic_rates = basic_rates;
4386
4387                 /* cf. IEEE 802.11 9.2.12 */
4388                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4389                     have_higher_than_11mbit)
4390                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4391                 else
4392                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4393
4394                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4395
4396                 /* set timing information */
4397                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4398                 rcu_read_lock();
4399                 ies = rcu_dereference(cbss->beacon_ies);
4400                 if (ies) {
4401                         const u8 *tim_ie;
4402
4403                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4404                         sdata->vif.bss_conf.sync_device_ts =
4405                                 bss->device_ts_beacon;
4406                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4407                                                   ies->data, ies->len);
4408                         if (tim_ie && tim_ie[1] >= 2)
4409                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4410                         else
4411                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4412                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4413                                                TIMING_BEACON_ONLY)) {
4414                         ies = rcu_dereference(cbss->proberesp_ies);
4415                         /* must be non-NULL since beacon IEs were NULL */
4416                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4417                         sdata->vif.bss_conf.sync_device_ts =
4418                                 bss->device_ts_presp;
4419                         sdata->vif.bss_conf.sync_dtim_count = 0;
4420                 } else {
4421                         sdata->vif.bss_conf.sync_tsf = 0;
4422                         sdata->vif.bss_conf.sync_device_ts = 0;
4423                         sdata->vif.bss_conf.sync_dtim_count = 0;
4424                 }
4425                 rcu_read_unlock();
4426
4427                 /* tell driver about BSSID, basic rates and timing */
4428                 ieee80211_bss_info_change_notify(sdata,
4429                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4430                         BSS_CHANGED_BEACON_INT);
4431
4432                 if (assoc)
4433                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4434
4435                 err = sta_info_insert(new_sta);
4436                 new_sta = NULL;
4437                 if (err) {
4438                         sdata_info(sdata,
4439                                    "failed to insert STA entry for the AP (error %d)\n",
4440                                    err);
4441                         return err;
4442                 }
4443         } else
4444                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4445
4446         /* Cancel scan to ensure that nothing interferes with connection */
4447         if (local->scanning)
4448                 ieee80211_scan_cancel(local);
4449
4450         return 0;
4451 }
4452
4453 /* config hooks */
4454 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4455                        struct cfg80211_auth_request *req)
4456 {
4457         struct ieee80211_local *local = sdata->local;
4458         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4459         struct ieee80211_mgd_auth_data *auth_data;
4460         u16 auth_alg;
4461         int err;
4462
4463         /* prepare auth data structure */
4464
4465         switch (req->auth_type) {
4466         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4467                 auth_alg = WLAN_AUTH_OPEN;
4468                 break;
4469         case NL80211_AUTHTYPE_SHARED_KEY:
4470                 if (IS_ERR(local->wep_tx_tfm))
4471                         return -EOPNOTSUPP;
4472                 auth_alg = WLAN_AUTH_SHARED_KEY;
4473                 break;
4474         case NL80211_AUTHTYPE_FT:
4475                 auth_alg = WLAN_AUTH_FT;
4476                 break;
4477         case NL80211_AUTHTYPE_NETWORK_EAP:
4478                 auth_alg = WLAN_AUTH_LEAP;
4479                 break;
4480         case NL80211_AUTHTYPE_SAE:
4481                 auth_alg = WLAN_AUTH_SAE;
4482                 break;
4483         default:
4484                 return -EOPNOTSUPP;
4485         }
4486
4487         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4488                             req->ie_len, GFP_KERNEL);
4489         if (!auth_data)
4490                 return -ENOMEM;
4491
4492         auth_data->bss = req->bss;
4493
4494         if (req->sae_data_len >= 4) {
4495                 __le16 *pos = (__le16 *) req->sae_data;
4496                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4497                 auth_data->sae_status = le16_to_cpu(pos[1]);
4498                 memcpy(auth_data->data, req->sae_data + 4,
4499                        req->sae_data_len - 4);
4500                 auth_data->data_len += req->sae_data_len - 4;
4501         }
4502
4503         if (req->ie && req->ie_len) {
4504                 memcpy(&auth_data->data[auth_data->data_len],
4505                        req->ie, req->ie_len);
4506                 auth_data->data_len += req->ie_len;
4507         }
4508
4509         if (req->key && req->key_len) {
4510                 auth_data->key_len = req->key_len;
4511                 auth_data->key_idx = req->key_idx;
4512                 memcpy(auth_data->key, req->key, req->key_len);
4513         }
4514
4515         auth_data->algorithm = auth_alg;
4516
4517         /* try to authenticate/probe */
4518
4519         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4520             ifmgd->assoc_data) {
4521                 err = -EBUSY;
4522                 goto err_free;
4523         }
4524
4525         if (ifmgd->auth_data)
4526                 ieee80211_destroy_auth_data(sdata, false);
4527
4528         /* prep auth_data so we don't go into idle on disassoc */
4529         ifmgd->auth_data = auth_data;
4530
4531         if (ifmgd->associated) {
4532                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4533
4534                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4535                                        WLAN_REASON_UNSPECIFIED,
4536                                        false, frame_buf);
4537
4538                 ieee80211_report_disconnect(sdata, frame_buf,
4539                                             sizeof(frame_buf), true,
4540                                             WLAN_REASON_UNSPECIFIED);
4541         }
4542
4543         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4544
4545         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4546         if (err)
4547                 goto err_clear;
4548
4549         err = ieee80211_auth(sdata);
4550         if (err) {
4551                 sta_info_destroy_addr(sdata, req->bss->bssid);
4552                 goto err_clear;
4553         }
4554
4555         /* hold our own reference */
4556         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4557         return 0;
4558
4559  err_clear:
4560         eth_zero_addr(ifmgd->bssid);
4561         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4562         ifmgd->auth_data = NULL;
4563         mutex_lock(&sdata->local->mtx);
4564         ieee80211_vif_release_channel(sdata);
4565         mutex_unlock(&sdata->local->mtx);
4566  err_free:
4567         kfree(auth_data);
4568         return err;
4569 }
4570
4571 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4572                         struct cfg80211_assoc_request *req)
4573 {
4574         struct ieee80211_local *local = sdata->local;
4575         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4576         struct ieee80211_bss *bss = (void *)req->bss->priv;
4577         struct ieee80211_mgd_assoc_data *assoc_data;
4578         const struct cfg80211_bss_ies *beacon_ies;
4579         struct ieee80211_supported_band *sband;
4580         const u8 *ssidie, *ht_ie, *vht_ie;
4581         int i, err;
4582         bool override = false;
4583
4584         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4585         if (!assoc_data)
4586                 return -ENOMEM;
4587
4588         rcu_read_lock();
4589         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4590         if (!ssidie) {
4591                 rcu_read_unlock();
4592                 kfree(assoc_data);
4593                 return -EINVAL;
4594         }
4595         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4596         assoc_data->ssid_len = ssidie[1];
4597         rcu_read_unlock();
4598
4599         if (ifmgd->associated) {
4600                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4601
4602                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4603                                        WLAN_REASON_UNSPECIFIED,
4604                                        false, frame_buf);
4605
4606                 ieee80211_report_disconnect(sdata, frame_buf,
4607                                             sizeof(frame_buf), true,
4608                                             WLAN_REASON_UNSPECIFIED);
4609         }
4610
4611         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4612                 err = -EBUSY;
4613                 goto err_free;
4614         }
4615
4616         if (ifmgd->assoc_data) {
4617                 err = -EBUSY;
4618                 goto err_free;
4619         }
4620
4621         if (ifmgd->auth_data) {
4622                 bool match;
4623
4624                 /* keep sta info, bssid if matching */
4625                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4626                 ieee80211_destroy_auth_data(sdata, match);
4627         }
4628
4629         /* prepare assoc data */
4630
4631         ifmgd->beacon_crc_valid = false;
4632
4633         assoc_data->wmm = bss->wmm_used &&
4634                           (local->hw.queues >= IEEE80211_NUM_ACS);
4635
4636         /*
4637          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4638          * We still associate in non-HT mode (11a/b/g) if any one of these
4639          * ciphers is configured as pairwise.
4640          * We can set this to true for non-11n hardware, that'll be checked
4641          * separately along with the peer capabilities.
4642          */
4643         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4644                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4645                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4646                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4647                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4648                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4649                         netdev_info(sdata->dev,
4650                                     "disabling HT/VHT due to WEP/TKIP use\n");
4651                 }
4652         }
4653
4654         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4655         sband = local->hw.wiphy->bands[req->bss->channel->band];
4656         if (!sband->ht_cap.ht_supported ||
4657             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4658             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4659                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4660                 if (!bss->wmm_used &&
4661                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4662                         netdev_info(sdata->dev,
4663                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4664         }
4665
4666         /* disable VHT if we don't support it or the AP doesn't use WMM */
4667         if (!sband->vht_cap.vht_supported ||
4668             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4669             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4670                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4671                 if (!bss->wmm_used &&
4672                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4673                         netdev_info(sdata->dev,
4674                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4675         }
4676
4677         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4678         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4679                sizeof(ifmgd->ht_capa_mask));
4680
4681         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4682         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4683                sizeof(ifmgd->vht_capa_mask));
4684
4685         if (req->ie && req->ie_len) {
4686                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4687                 assoc_data->ie_len = req->ie_len;
4688         }
4689
4690         assoc_data->bss = req->bss;
4691
4692         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4693                 if (ifmgd->powersave)
4694                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4695                 else
4696                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4697         } else
4698                 sdata->smps_mode = ifmgd->req_smps;
4699
4700         assoc_data->capability = req->bss->capability;
4701         assoc_data->supp_rates = bss->supp_rates;
4702         assoc_data->supp_rates_len = bss->supp_rates_len;
4703
4704         rcu_read_lock();
4705         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4706         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4707                 assoc_data->ap_ht_param =
4708                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4709         else
4710                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4711         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4712         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4713                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4714                        sizeof(struct ieee80211_vht_cap));
4715         else
4716                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4717         rcu_read_unlock();
4718
4719         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4720                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4721              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4722                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4723
4724         if (bss->wmm_used && bss->uapsd_supported &&
4725             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4726                 assoc_data->uapsd = true;
4727                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4728         } else {
4729                 assoc_data->uapsd = false;
4730                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4731         }
4732
4733         if (req->prev_bssid)
4734                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4735
4736         if (req->use_mfp) {
4737                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4738                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4739         } else {
4740                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4741                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4742         }
4743
4744         if (req->flags & ASSOC_REQ_USE_RRM)
4745                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4746         else
4747                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4748
4749         if (req->crypto.control_port)
4750                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4751         else
4752                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4753
4754         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4755         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4756         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4757                                                         sdata->vif.type);
4758
4759         /* kick off associate process */
4760
4761         ifmgd->assoc_data = assoc_data;
4762         ifmgd->dtim_period = 0;
4763         ifmgd->have_beacon = false;
4764
4765         /* override HT/VHT configuration only if the AP and we support it */
4766         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4767                 struct ieee80211_sta_ht_cap sta_ht_cap;
4768
4769                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4770                         override = true;
4771
4772                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4773                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4774
4775                 /* check for 40 MHz disable override */
4776                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4777                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4778                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4779                         override = true;
4780
4781                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4782                     req->flags & ASSOC_REQ_DISABLE_VHT)
4783                         override = true;
4784         }
4785
4786         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4787                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4788                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4789         }
4790
4791         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4792                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4793
4794         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4795         if (err)
4796                 goto err_clear;
4797
4798         rcu_read_lock();
4799         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4800
4801         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4802             !beacon_ies) {
4803                 /*
4804                  * Wait up to one beacon interval ...
4805                  * should this be more if we miss one?
4806                  */
4807                 sdata_info(sdata, "waiting for beacon from %pM\n",
4808                            ifmgd->bssid);
4809                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4810                 assoc_data->timeout_started = true;
4811                 assoc_data->need_beacon = true;
4812         } else if (beacon_ies) {
4813                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4814                                                     beacon_ies->data,
4815                                                     beacon_ies->len);
4816                 u8 dtim_count = 0;
4817
4818                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4819                         const struct ieee80211_tim_ie *tim;
4820                         tim = (void *)(tim_ie + 2);
4821                         ifmgd->dtim_period = tim->dtim_period;
4822                         dtim_count = tim->dtim_count;
4823                 }
4824                 ifmgd->have_beacon = true;
4825                 assoc_data->timeout = jiffies;
4826                 assoc_data->timeout_started = true;
4827
4828                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4829                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4830                         sdata->vif.bss_conf.sync_device_ts =
4831                                 bss->device_ts_beacon;
4832                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4833                 }
4834         } else {
4835                 assoc_data->timeout = jiffies;
4836                 assoc_data->timeout_started = true;
4837         }
4838         rcu_read_unlock();
4839
4840         run_again(sdata, assoc_data->timeout);
4841
4842         if (bss->corrupt_data) {
4843                 char *corrupt_type = "data";
4844                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4845                         if (bss->corrupt_data &
4846                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4847                                 corrupt_type = "beacon and probe response";
4848                         else
4849                                 corrupt_type = "beacon";
4850                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4851                         corrupt_type = "probe response";
4852                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4853                            corrupt_type);
4854         }
4855
4856         return 0;
4857  err_clear:
4858         eth_zero_addr(ifmgd->bssid);
4859         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4860         ifmgd->assoc_data = NULL;
4861  err_free:
4862         kfree(assoc_data);
4863         return err;
4864 }
4865
4866 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4867                          struct cfg80211_deauth_request *req)
4868 {
4869         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4870         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4871         bool tx = !req->local_state_change;
4872
4873         if (ifmgd->auth_data &&
4874             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4875                 sdata_info(sdata,
4876                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4877                            req->bssid, req->reason_code,
4878                            ieee80211_get_reason_code_string(req->reason_code));
4879
4880                 drv_mgd_prepare_tx(sdata->local, sdata);
4881                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4882                                                IEEE80211_STYPE_DEAUTH,
4883                                                req->reason_code, tx,
4884                                                frame_buf);
4885                 ieee80211_destroy_auth_data(sdata, false);
4886                 ieee80211_report_disconnect(sdata, frame_buf,
4887                                             sizeof(frame_buf), true,
4888                                             req->reason_code);
4889
4890                 return 0;
4891         }
4892
4893         if (ifmgd->assoc_data &&
4894             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4895                 sdata_info(sdata,
4896                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
4897                            req->bssid, req->reason_code,
4898                            ieee80211_get_reason_code_string(req->reason_code));
4899
4900                 drv_mgd_prepare_tx(sdata->local, sdata);
4901                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4902                                                IEEE80211_STYPE_DEAUTH,
4903                                                req->reason_code, tx,
4904                                                frame_buf);
4905                 ieee80211_destroy_assoc_data(sdata, false);
4906                 ieee80211_report_disconnect(sdata, frame_buf,
4907                                             sizeof(frame_buf), true,
4908                                             req->reason_code);
4909                 return 0;
4910         }
4911
4912         if (ifmgd->associated &&
4913             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4914                 sdata_info(sdata,
4915                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4916                            req->bssid, req->reason_code,
4917                            ieee80211_get_reason_code_string(req->reason_code));
4918
4919                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4920                                        req->reason_code, tx, frame_buf);
4921                 ieee80211_report_disconnect(sdata, frame_buf,
4922                                             sizeof(frame_buf), true,
4923                                             req->reason_code);
4924                 return 0;
4925         }
4926
4927         return -ENOTCONN;
4928 }
4929
4930 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4931                            struct cfg80211_disassoc_request *req)
4932 {
4933         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4934         u8 bssid[ETH_ALEN];
4935         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4936
4937         /*
4938          * cfg80211 should catch this ... but it's racy since
4939          * we can receive a disassoc frame, process it, hand it
4940          * to cfg80211 while that's in a locked section already
4941          * trying to tell us that the user wants to disconnect.
4942          */
4943         if (ifmgd->associated != req->bss)
4944                 return -ENOLINK;
4945
4946         sdata_info(sdata,
4947                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4948                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4949
4950         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4951         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4952                                req->reason_code, !req->local_state_change,
4953                                frame_buf);
4954
4955         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4956                                     req->reason_code);
4957
4958         return 0;
4959 }
4960
4961 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4962 {
4963         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4964
4965         /*
4966          * Make sure some work items will not run after this,
4967          * they will not do anything but might not have been
4968          * cancelled when disconnecting.
4969          */
4970         cancel_work_sync(&ifmgd->monitor_work);
4971         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4972         cancel_work_sync(&ifmgd->request_smps_work);
4973         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4974         cancel_work_sync(&ifmgd->chswitch_work);
4975         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4976
4977         sdata_lock(sdata);
4978         if (ifmgd->assoc_data) {
4979                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4980                 ieee80211_destroy_assoc_data(sdata, false);
4981                 cfg80211_assoc_timeout(sdata->dev, bss);
4982         }
4983         if (ifmgd->auth_data)
4984                 ieee80211_destroy_auth_data(sdata, false);
4985         spin_lock_bh(&ifmgd->teardown_lock);
4986         if (ifmgd->teardown_skb) {
4987                 kfree_skb(ifmgd->teardown_skb);
4988                 ifmgd->teardown_skb = NULL;
4989                 ifmgd->orig_teardown_skb = NULL;
4990         }
4991         spin_unlock_bh(&ifmgd->teardown_lock);
4992         del_timer_sync(&ifmgd->timer);
4993         sdata_unlock(sdata);
4994 }
4995
4996 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4997                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4998                                gfp_t gfp)
4999 {
5000         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5001
5002         trace_api_cqm_rssi_notify(sdata, rssi_event);
5003
5004         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5005 }
5006 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5007
5008 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5009 {
5010         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5011
5012         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5013
5014         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5015 }
5016 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);