net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  * Copyright (C) 2015 Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33
  34 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  35 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  36 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  37 #define IEEE80211_AUTH_MAX_TRIES        3
  38 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  39 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  40 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  41 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  42 #define IEEE80211_ASSOC_MAX_TRIES       3
  43
  44 static int max_nullfunc_tries = 2;
  45 module_param(max_nullfunc_tries, int, 0644);
  46 MODULE_PARM_DESC(max_nullfunc_tries,
  47                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  48
  49 static int max_probe_tries = 5;
  50 module_param(max_probe_tries, int, 0644);
  51 MODULE_PARM_DESC(max_probe_tries,
  52                  "Maximum probe tries before disconnecting (reason 4).");
  53
  54 /*
  55  * Beacon loss timeout is calculated as N frames times the
  56  * advertised beacon interval.  This may need to be somewhat
  57  * higher than what hardware might detect to account for
  58  * delays in the host processing frames. But since we also
  59  * probe on beacon miss before declaring the connection lost
  60  * default to what we want.
  61  */
  62 static int beacon_loss_count = 7;
  63 module_param(beacon_loss_count, int, 0644);
  64 MODULE_PARM_DESC(beacon_loss_count,
  65                  "Number of beacon intervals before we decide beacon was lost.");
  66
  67 /*
  68  * Time the connection can be idle before we probe
  69  * it to see if we can still talk to the AP.
  70  */
  71 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  72 /*
  73  * Time we wait for a probe response after sending
  74  * a probe request because of beacon loss or for
  75  * checking the connection still works.
  76  */
  77 static int probe_wait_ms = 500;
  78 module_param(probe_wait_ms, int, 0644);
  79 MODULE_PARM_DESC(probe_wait_ms,
  80                  "Maximum time(ms) to wait for probe response"
  81                  " before disconnecting (reason 4).");
  82
  83 /*
  84  * How many Beacon frames need to have been used in average signal strength
  85  * before starting to indicate signal change events.
  86  */
  87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  88
  89 /*
  90  * We can have multiple work items (and connection probing)
  91  * scheduling this timer, but we need to take care to only
  92  * reschedule it when it should fire _earlier_ than it was
  93  * asked for before, or if it's not pending right now. This
  94  * function ensures that. Note that it then is required to
  95  * run this function for all timeouts after the first one
  96  * has happened -- the work that runs from this timer will
  97  * do that.
  98  */
  99 static void run_again(struct ieee80211_sub_if_data *sdata,
 100                       unsigned long timeout)
 101 {
 102         sdata_assert_lock(sdata);
 103
 104         if (!timer_pending(&sdata->u.mgd.timer) ||
 105             time_before(timeout, sdata->u.mgd.timer.expires))
 106                 mod_timer(&sdata->u.mgd.timer, timeout);
 107 }
 108
 109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 110 {
 111         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 112                 return;
 113
 114         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 119 }
 120
 121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 122 {
 123         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 124
 125         if (unlikely(!sdata->u.mgd.associated))
 126                 return;
 127
 128         ifmgd->probe_send_count = 0;
 129
 130         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 131                 return;
 132
 133         mod_timer(&sdata->u.mgd.conn_mon_timer,
 134                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 135 }
 136
 137 static int ecw2cw(int ecw)
 138 {
 139         return (1 << ecw) - 1;
 140 }
 141
 142 static u32
 143 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 144                              struct ieee80211_supported_band *sband,
 145                              struct ieee80211_channel *channel,
 146                              const struct ieee80211_ht_cap *ht_cap,
 147                              const struct ieee80211_ht_operation *ht_oper,
 148                              const struct ieee80211_vht_operation *vht_oper,
 149                              struct cfg80211_chan_def *chandef, bool tracking)
 150 {
 151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 152         struct cfg80211_chan_def vht_chandef;
 153         struct ieee80211_sta_ht_cap sta_ht_cap;
 154         u32 ht_cfreq, ret;
 155
 156         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 157         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 158
 159         chandef->chan = channel;
 160         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 161         chandef->center_freq1 = channel->center_freq;
 162         chandef->center_freq2 = 0;
 163
 164         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 165                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 166                 goto out;
 167         }
 168
 169         chandef->width = NL80211_CHAN_WIDTH_20;
 170
 171         if (!(ht_cap->cap_info &
 172               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 173                 ret = IEEE80211_STA_DISABLE_40MHZ;
 174                 vht_chandef = *chandef;
 175                 goto out;
 176         }
 177
 178         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 179                                                   channel->band);
 180         /* check that channel matches the right operating channel */
 181         if (!tracking && channel->center_freq != ht_cfreq) {
 182                 /*
 183                  * It's possible that some APs are confused here;
 184                  * Netgear WNDR3700 sometimes reports 4 higher than
 185                  * the actual channel in association responses, but
 186                  * since we look at probe response/beacon data here
 187                  * it should be OK.
 188                  */
 189                 sdata_info(sdata,
 190                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 191                            channel->center_freq, ht_cfreq,
 192                            ht_oper->primary_chan, channel->band);
 193                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 194                 goto out;
 195         }
 196
 197         /* check 40 MHz support, if we have it */
 198         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 199                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 200                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 201                         chandef->width = NL80211_CHAN_WIDTH_40;
 202                         chandef->center_freq1 += 10;
 203                         break;
 204                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 205                         chandef->width = NL80211_CHAN_WIDTH_40;
 206                         chandef->center_freq1 -= 10;
 207                         break;
 208                 }
 209         } else {
 210                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 211                 ret = IEEE80211_STA_DISABLE_VHT;
 212                 /* also mark 40 MHz disabled */
 213                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 214                 goto out;
 215         }
 216
 217         if (!vht_oper || !sband->vht_cap.vht_supported) {
 218                 ret = IEEE80211_STA_DISABLE_VHT;
 219                 goto out;
 220         }
 221
 222         vht_chandef.chan = channel;
 223         vht_chandef.center_freq1 =
 224                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 225                                                channel->band);
 226         vht_chandef.center_freq2 = 0;
 227
 228         switch (vht_oper->chan_width) {
 229         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 230                 vht_chandef.width = chandef->width;
 231                 vht_chandef.center_freq1 = chandef->center_freq1;
 232                 break;
 233         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 234                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 235                 break;
 236         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 237                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 238                 break;
 239         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 240                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 241                 vht_chandef.center_freq2 =
 242                         ieee80211_channel_to_frequency(
 243                                 vht_oper->center_freq_seg2_idx,
 244                                 channel->band);
 245                 break;
 246         default:
 247                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 248                         sdata_info(sdata,
 249                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 250                                    vht_oper->chan_width);
 251                 ret = IEEE80211_STA_DISABLE_VHT;
 252                 goto out;
 253         }
 254
 255         if (!cfg80211_chandef_valid(&vht_chandef)) {
 256                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 257                         sdata_info(sdata,
 258                                    "AP VHT information is invalid, disable VHT\n");
 259                 ret = IEEE80211_STA_DISABLE_VHT;
 260                 goto out;
 261         }
 262
 263         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 264                 ret = 0;
 265                 goto out;
 266         }
 267
 268         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 269                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 270                         sdata_info(sdata,
 271                                    "AP VHT information doesn't match HT, disable VHT\n");
 272                 ret = IEEE80211_STA_DISABLE_VHT;
 273                 goto out;
 274         }
 275
 276         *chandef = vht_chandef;
 277
 278         ret = 0;
 279
 280 out:
 281         /*
 282          * When tracking the current AP, don't do any further checks if the
 283          * new chandef is identical to the one we're currently using for the
 284          * connection. This keeps us from playing ping-pong with regulatory,
 285          * without it the following can happen (for example):
 286          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 287          *  - AP advertises regdom US
 288          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 289          *  - the code below detects an unsupported channel, downgrades, and
 290          *    we disconnect from the AP in the caller
 291          *  - disconnect causes CRDA to reload world regdomain and the game
 292          *    starts anew.
 293          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 294          *
 295          * It seems possible that there are still scenarios with CSA or real
 296          * bandwidth changes where a this could happen, but those cases are
 297          * less common and wouldn't completely prevent using the AP.
 298          */
 299         if (tracking &&
 300             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 301                 return ret;
 302
 303         /* don't print the message below for VHT mismatch if VHT is disabled */
 304         if (ret & IEEE80211_STA_DISABLE_VHT)
 305                 vht_chandef = *chandef;
 306
 307         /*
 308          * Ignore the DISABLED flag when we're already connected and only
 309          * tracking the APs beacon for bandwidth changes - otherwise we
 310          * might get disconnected here if we connect to an AP, update our
 311          * regulatory information based on the AP's country IE and the
 312          * information we have is wrong/outdated and disables the channel
 313          * that we're actually using for the connection to the AP.
 314          */
 315         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 316                                         tracking ? 0 :
 317                                                    IEEE80211_CHAN_DISABLED)) {
 318                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 319                         ret = IEEE80211_STA_DISABLE_HT |
 320                               IEEE80211_STA_DISABLE_VHT;
 321                         break;
 322                 }
 323
 324                 ret |= ieee80211_chandef_downgrade(chandef);
 325         }
 326
 327         if (chandef->width != vht_chandef.width && !tracking)
 328                 sdata_info(sdata,
 329                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 330
 331         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 332         return ret;
 333 }
 334
 335 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 336                                struct sta_info *sta,
 337                                const struct ieee80211_ht_cap *ht_cap,
 338                                const struct ieee80211_ht_operation *ht_oper,
 339                                const struct ieee80211_vht_operation *vht_oper,
 340                                const u8 *bssid, u32 *changed)
 341 {
 342         struct ieee80211_local *local = sdata->local;
 343         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 344         struct ieee80211_supported_band *sband;
 345         struct ieee80211_channel *chan;
 346         struct cfg80211_chan_def chandef;
 347         u16 ht_opmode;
 348         u32 flags;
 349         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 350         int ret;
 351
 352         /* if HT was/is disabled, don't track any bandwidth changes */
 353         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 354                 return 0;
 355
 356         /* don't check VHT if we associated as non-VHT station */
 357         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 358                 vht_oper = NULL;
 359
 360         if (WARN_ON_ONCE(!sta))
 361                 return -EINVAL;
 362
 363         /*
 364          * if bss configuration changed store the new one -
 365          * this may be applicable even if channel is identical
 366          */
 367         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 368         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 369                 *changed |= BSS_CHANGED_HT;
 370                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 371         }
 372
 373         chan = sdata->vif.bss_conf.chandef.chan;
 374         sband = local->hw.wiphy->bands[chan->band];
 375
 376         /* calculate new channel (type) based on HT/VHT operation IEs */
 377         flags = ieee80211_determine_chantype(sdata, sband, chan,
 378                                              ht_cap, ht_oper, vht_oper,
 379                                              &chandef, true);
 380
 381         /*
 382          * Downgrade the new channel if we associated with restricted
 383          * capabilities. For example, if we associated as a 20 MHz STA
 384          * to a 40 MHz AP (due to regulatory, capabilities or config
 385          * reasons) then switching to a 40 MHz channel now won't do us
 386          * any good -- we couldn't use it with the AP.
 387          */
 388         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 389             chandef.width == NL80211_CHAN_WIDTH_80P80)
 390                 flags |= ieee80211_chandef_downgrade(&chandef);
 391         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 392             chandef.width == NL80211_CHAN_WIDTH_160)
 393                 flags |= ieee80211_chandef_downgrade(&chandef);
 394         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 395             chandef.width > NL80211_CHAN_WIDTH_20)
 396                 flags |= ieee80211_chandef_downgrade(&chandef);
 397
 398         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 399                 return 0;
 400
 401         sdata_info(sdata,
 402                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 403                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 404                    chandef.center_freq1, chandef.center_freq2);
 405
 406         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 407                                       IEEE80211_STA_DISABLE_VHT |
 408                                       IEEE80211_STA_DISABLE_40MHZ |
 409                                       IEEE80211_STA_DISABLE_80P80MHZ |
 410                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 411             !cfg80211_chandef_valid(&chandef)) {
 412                 sdata_info(sdata,
 413                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 414                            ifmgd->bssid);
 415                 return -EINVAL;
 416         }
 417
 418         switch (chandef.width) {
 419         case NL80211_CHAN_WIDTH_20_NOHT:
 420         case NL80211_CHAN_WIDTH_20:
 421                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 422                 break;
 423         case NL80211_CHAN_WIDTH_40:
 424                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 425                 break;
 426         case NL80211_CHAN_WIDTH_80:
 427                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 428                 break;
 429         case NL80211_CHAN_WIDTH_80P80:
 430         case NL80211_CHAN_WIDTH_160:
 431                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 432                 break;
 433         default:
 434                 return -EINVAL;
 435         }
 436
 437         if (new_sta_bw > sta->cur_max_bandwidth)
 438                 new_sta_bw = sta->cur_max_bandwidth;
 439
 440         if (new_sta_bw < sta->sta.bandwidth) {
 441                 sta->sta.bandwidth = new_sta_bw;
 442                 rate_control_rate_update(local, sband, sta,
 443                                          IEEE80211_RC_BW_CHANGED);
 444         }
 445
 446         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 447         if (ret) {
 448                 sdata_info(sdata,
 449                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 450                            ifmgd->bssid);
 451                 return ret;
 452         }
 453
 454         if (new_sta_bw > sta->sta.bandwidth) {
 455                 sta->sta.bandwidth = new_sta_bw;
 456                 rate_control_rate_update(local, sband, sta,
 457                                          IEEE80211_RC_BW_CHANGED);
 458         }
 459
 460         return 0;
 461 }
 462
 463 /* frame sending functions */
 464
 465 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 466                                 struct sk_buff *skb, u8 ap_ht_param,
 467                                 struct ieee80211_supported_band *sband,
 468                                 struct ieee80211_channel *channel,
 469                                 enum ieee80211_smps_mode smps)
 470 {
 471         u8 *pos;
 472         u32 flags = channel->flags;
 473         u16 cap;
 474         struct ieee80211_sta_ht_cap ht_cap;
 475
 476         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 477
 478         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 479         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 480
 481         /* determine capability flags */
 482         cap = ht_cap.cap;
 483
 484         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 485         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 486                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 487                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 488                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 489                 }
 490                 break;
 491         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 492                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 493                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 494                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 495                 }
 496                 break;
 497         }
 498
 499         /*
 500          * If 40 MHz was disabled associate as though we weren't
 501          * capable of 40 MHz -- some broken APs will never fall
 502          * back to trying to transmit in 20 MHz.
 503          */
 504         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 505                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 506                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 507         }
 508
 509         /* set SM PS mode properly */
 510         cap &= ~IEEE80211_HT_CAP_SM_PS;
 511         switch (smps) {
 512         case IEEE80211_SMPS_AUTOMATIC:
 513         case IEEE80211_SMPS_NUM_MODES:
 514                 WARN_ON(1);
 515         case IEEE80211_SMPS_OFF:
 516                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 517                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 518                 break;
 519         case IEEE80211_SMPS_STATIC:
 520                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 521                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 522                 break;
 523         case IEEE80211_SMPS_DYNAMIC:
 524                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 525                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 526                 break;
 527         }
 528
 529         /* reserve and fill IE */
 530         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 531         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 532 }
 533
 534 /* This function determines vht capability flags for the association
 535  * and builds the IE.
 536  * Note - the function may set the owner of the MU-MIMO capability
 537  */
 538 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 539                                  struct sk_buff *skb,
 540                                  struct ieee80211_supported_band *sband,
 541                                  struct ieee80211_vht_cap *ap_vht_cap)
 542 {
 543         struct ieee80211_local *local = sdata->local;
 544         u8 *pos;
 545         u32 cap;
 546         struct ieee80211_sta_vht_cap vht_cap;
 547         u32 mask, ap_bf_sts, our_bf_sts;
 548
 549         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 550
 551         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 552         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 553
 554         /* determine capability flags */
 555         cap = vht_cap.cap;
 556
 557         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 558                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 559
 560                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 561                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 562                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 563                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 564         }
 565
 566         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 567                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 568                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 569         }
 570
 571         /*
 572          * Some APs apparently get confused if our capabilities are better
 573          * than theirs, so restrict what we advertise in the assoc request.
 574          */
 575         if (!(ap_vht_cap->vht_cap_info &
 576                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 577                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 578                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 579         else if (!(ap_vht_cap->vht_cap_info &
 580                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 581                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 582
 583         /*
 584          * If some other vif is using the MU-MIMO capablity we cannot associate
 585          * using MU-MIMO - this will lead to contradictions in the group-id
 586          * mechanism.
 587          * Ownership is defined since association request, in order to avoid
 588          * simultaneous associations with MU-MIMO.
 589          */
 590         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 591                 bool disable_mu_mimo = false;
 592                 struct ieee80211_sub_if_data *other;
 593
 594                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 595                         if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
 596                                 disable_mu_mimo = true;
 597                                 break;
 598                         }
 599                 }
 600                 if (disable_mu_mimo)
 601                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 602                 else
 603                         sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
 604         }
 605
 606         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 607
 608         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 609         our_bf_sts = cap & mask;
 610
 611         if (ap_bf_sts < our_bf_sts) {
 612                 cap &= ~mask;
 613                 cap |= ap_bf_sts;
 614         }
 615
 616         /* reserve and fill IE */
 617         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 618         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 619 }
 620
 621 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 622 {
 623         struct ieee80211_local *local = sdata->local;
 624         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 625         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 626         struct sk_buff *skb;
 627         struct ieee80211_mgmt *mgmt;
 628         u8 *pos, qos_info;
 629         size_t offset = 0, noffset;
 630         int i, count, rates_len, supp_rates_len, shift;
 631         u16 capab;
 632         struct ieee80211_supported_band *sband;
 633         struct ieee80211_chanctx_conf *chanctx_conf;
 634         struct ieee80211_channel *chan;
 635         u32 rate_flags, rates = 0;
 636
 637         sdata_assert_lock(sdata);
 638
 639         rcu_read_lock();
 640         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 641         if (WARN_ON(!chanctx_conf)) {
 642                 rcu_read_unlock();
 643                 return;
 644         }
 645         chan = chanctx_conf->def.chan;
 646         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 647         rcu_read_unlock();
 648         sband = local->hw.wiphy->bands[chan->band];
 649         shift = ieee80211_vif_get_shift(&sdata->vif);
 650
 651         if (assoc_data->supp_rates_len) {
 652                 /*
 653                  * Get all rates supported by the device and the AP as
 654                  * some APs don't like getting a superset of their rates
 655                  * in the association request (e.g. D-Link DAP 1353 in
 656                  * b-only mode)...
 657                  */
 658                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 659                                                      assoc_data->supp_rates,
 660                                                      assoc_data->supp_rates_len,
 661                                                      &rates);
 662         } else {
 663                 /*
 664                  * In case AP not provide any supported rates information
 665                  * before association, we send information element(s) with
 666                  * all rates that we support.
 667                  */
 668                 rates_len = 0;
 669                 for (i = 0; i < sband->n_bitrates; i++) {
 670                         if ((rate_flags & sband->bitrates[i].flags)
 671                             != rate_flags)
 672                                 continue;
 673                         rates |= BIT(i);
 674                         rates_len++;
 675                 }
 676         }
 677
 678         skb = alloc_skb(local->hw.extra_tx_headroom +
 679                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 680                         2 + assoc_data->ssid_len + /* SSID */
 681                         4 + rates_len + /* (extended) rates */
 682                         4 + /* power capability */
 683                         2 + 2 * sband->n_channels + /* supported channels */
 684                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 685                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 686                         assoc_data->ie_len + /* extra IEs */
 687                         9, /* WMM */
 688                         GFP_KERNEL);
 689         if (!skb)
 690                 return;
 691
 692         skb_reserve(skb, local->hw.extra_tx_headroom);
 693
 694         capab = WLAN_CAPABILITY_ESS;
 695
 696         if (sband->band == IEEE80211_BAND_2GHZ) {
 697                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 698                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 699         }
 700
 701         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 702                 capab |= WLAN_CAPABILITY_PRIVACY;
 703
 704         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 705             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 706                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 707
 708         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 709                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 710
 711         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 712         memset(mgmt, 0, 24);
 713         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 714         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 715         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 716
 717         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 718                 skb_put(skb, 10);
 719                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 720                                                   IEEE80211_STYPE_REASSOC_REQ);
 721                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 722                 mgmt->u.reassoc_req.listen_interval =
 723                                 cpu_to_le16(local->hw.conf.listen_interval);
 724                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 725                        ETH_ALEN);
 726         } else {
 727                 skb_put(skb, 4);
 728                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 729                                                   IEEE80211_STYPE_ASSOC_REQ);
 730                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 731                 mgmt->u.assoc_req.listen_interval =
 732                                 cpu_to_le16(local->hw.conf.listen_interval);
 733         }
 734
 735         /* SSID */
 736         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 737         *pos++ = WLAN_EID_SSID;
 738         *pos++ = assoc_data->ssid_len;
 739         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 740
 741         /* add all rates which were marked to be used above */
 742         supp_rates_len = rates_len;
 743         if (supp_rates_len > 8)
 744                 supp_rates_len = 8;
 745
 746         pos = skb_put(skb, supp_rates_len + 2);
 747         *pos++ = WLAN_EID_SUPP_RATES;
 748         *pos++ = supp_rates_len;
 749
 750         count = 0;
 751         for (i = 0; i < sband->n_bitrates; i++) {
 752                 if (BIT(i) & rates) {
 753                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 754                                                 5 * (1 << shift));
 755                         *pos++ = (u8) rate;
 756                         if (++count == 8)
 757                                 break;
 758                 }
 759         }
 760
 761         if (rates_len > count) {
 762                 pos = skb_put(skb, rates_len - count + 2);
 763                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 764                 *pos++ = rates_len - count;
 765
 766                 for (i++; i < sband->n_bitrates; i++) {
 767                         if (BIT(i) & rates) {
 768                                 int rate;
 769                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 770                                                     5 * (1 << shift));
 771                                 *pos++ = (u8) rate;
 772                         }
 773                 }
 774         }
 775
 776         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 777             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 778                 pos = skb_put(skb, 4);
 779                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 780                 *pos++ = 2;
 781                 *pos++ = 0; /* min tx power */
 782                  /* max tx power */
 783                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 784         }
 785
 786         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 787                 /* TODO: get this in reg domain format */
 788                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 789                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 790                 *pos++ = 2 * sband->n_channels;
 791                 for (i = 0; i < sband->n_channels; i++) {
 792                         *pos++ = ieee80211_frequency_to_channel(
 793                                         sband->channels[i].center_freq);
 794                         *pos++ = 1; /* one channel in the subband*/
 795                 }
 796         }
 797
 798         /* if present, add any custom IEs that go before HT */
 799         if (assoc_data->ie_len) {
 800                 static const u8 before_ht[] = {
 801                         WLAN_EID_SSID,
 802                         WLAN_EID_SUPP_RATES,
 803                         WLAN_EID_EXT_SUPP_RATES,
 804                         WLAN_EID_PWR_CAPABILITY,
 805                         WLAN_EID_SUPPORTED_CHANNELS,
 806                         WLAN_EID_RSN,
 807                         WLAN_EID_QOS_CAPA,
 808                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 809                         WLAN_EID_MOBILITY_DOMAIN,
 810                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 811                         WLAN_EID_RIC_DATA,              /* reassoc only */
 812                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 813                 };
 814                 static const u8 after_ric[] = {
 815                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 816                         WLAN_EID_HT_CAPABILITY,
 817                         WLAN_EID_BSS_COEX_2040,
 818                         WLAN_EID_EXT_CAPABILITY,
 819                         WLAN_EID_QOS_TRAFFIC_CAPA,
 820                         WLAN_EID_TIM_BCAST_REQ,
 821                         WLAN_EID_INTERWORKING,
 822                         /* 60GHz doesn't happen right now */
 823                         WLAN_EID_VHT_CAPABILITY,
 824                         WLAN_EID_OPMODE_NOTIF,
 825                 };
 826
 827                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 828                                                  assoc_data->ie_len,
 829                                                  before_ht,
 830                                                  ARRAY_SIZE(before_ht),
 831                                                  after_ric,
 832                                                  ARRAY_SIZE(after_ric),
 833                                                  offset);
 834                 pos = skb_put(skb, noffset - offset);
 835                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 836                 offset = noffset;
 837         }
 838
 839         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 840                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 841                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 842
 843         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 844                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 845                                     sband, chan, sdata->smps_mode);
 846
 847         /* if present, add any custom IEs that go before VHT */
 848         if (assoc_data->ie_len) {
 849                 static const u8 before_vht[] = {
 850                         WLAN_EID_SSID,
 851                         WLAN_EID_SUPP_RATES,
 852                         WLAN_EID_EXT_SUPP_RATES,
 853                         WLAN_EID_PWR_CAPABILITY,
 854                         WLAN_EID_SUPPORTED_CHANNELS,
 855                         WLAN_EID_RSN,
 856                         WLAN_EID_QOS_CAPA,
 857                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 858                         WLAN_EID_MOBILITY_DOMAIN,
 859                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 860                         WLAN_EID_HT_CAPABILITY,
 861                         WLAN_EID_BSS_COEX_2040,
 862                         WLAN_EID_EXT_CAPABILITY,
 863                         WLAN_EID_QOS_TRAFFIC_CAPA,
 864                         WLAN_EID_TIM_BCAST_REQ,
 865                         WLAN_EID_INTERWORKING,
 866                 };
 867
 868                 /* RIC already taken above, so no need to handle here anymore */
 869                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 870                                              before_vht, ARRAY_SIZE(before_vht),
 871                                              offset);
 872                 pos = skb_put(skb, noffset - offset);
 873                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 874                 offset = noffset;
 875         }
 876
 877         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 878                 ieee80211_add_vht_ie(sdata, skb, sband,
 879                                      &assoc_data->ap_vht_cap);
 880
 881         /* if present, add any custom non-vendor IEs that go after HT */
 882         if (assoc_data->ie_len) {
 883                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 884                                                     assoc_data->ie_len,
 885                                                     offset);
 886                 pos = skb_put(skb, noffset - offset);
 887                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 888                 offset = noffset;
 889         }
 890
 891         if (assoc_data->wmm) {
 892                 if (assoc_data->uapsd) {
 893                         qos_info = ifmgd->uapsd_queues;
 894                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 895                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 896                 } else {
 897                         qos_info = 0;
 898                 }
 899
 900                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 901         }
 902
 903         /* add any remaining custom (i.e. vendor specific here) IEs */
 904         if (assoc_data->ie_len) {
 905                 noffset = assoc_data->ie_len;
 906                 pos = skb_put(skb, noffset - offset);
 907                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 908         }
 909
 910         drv_mgd_prepare_tx(local, sdata);
 911
 912         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 913         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 914                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 915                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 916         ieee80211_tx_skb(sdata, skb);
 917 }
 918
 919 void ieee80211_send_pspoll(struct ieee80211_local *local,
 920                            struct ieee80211_sub_if_data *sdata)
 921 {
 922         struct ieee80211_pspoll *pspoll;
 923         struct sk_buff *skb;
 924
 925         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 926         if (!skb)
 927                 return;
 928
 929         pspoll = (struct ieee80211_pspoll *) skb->data;
 930         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 931
 932         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 933         ieee80211_tx_skb(sdata, skb);
 934 }
 935
 936 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 937                              struct ieee80211_sub_if_data *sdata,
 938                              bool powersave)
 939 {
 940         struct sk_buff *skb;
 941         struct ieee80211_hdr_3addr *nullfunc;
 942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 943
 944         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 945         if (!skb)
 946                 return;
 947
 948         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 949         if (powersave)
 950                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 951
 952         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 953                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 954
 955         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 956                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 957
 958         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 959                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 960
 961         ieee80211_tx_skb(sdata, skb);
 962 }
 963
 964 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 965                                           struct ieee80211_sub_if_data *sdata)
 966 {
 967         struct sk_buff *skb;
 968         struct ieee80211_hdr *nullfunc;
 969         __le16 fc;
 970
 971         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 972                 return;
 973
 974         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 975         if (!skb)
 976                 return;
 977
 978         skb_reserve(skb, local->hw.extra_tx_headroom);
 979
 980         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 981         memset(nullfunc, 0, 30);
 982         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 983                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 984         nullfunc->frame_control = fc;
 985         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 986         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 987         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 988         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 989
 990         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 991         ieee80211_tx_skb(sdata, skb);
 992 }
 993
 994 /* spectrum management related things */
 995 static void ieee80211_chswitch_work(struct work_struct *work)
 996 {
 997         struct ieee80211_sub_if_data *sdata =
 998                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 999         struct ieee80211_local *local = sdata->local;
1000         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1001         int ret;
1002
1003         if (!ieee80211_sdata_running(sdata))
1004                 return;
1005
1006         sdata_lock(sdata);
1007         mutex_lock(&local->mtx);
1008         mutex_lock(&local->chanctx_mtx);
1009
1010         if (!ifmgd->associated)
1011                 goto out;
1012
1013         if (!sdata->vif.csa_active)
1014                 goto out;
1015
1016         /*
1017          * using reservation isn't immediate as it may be deferred until later
1018          * with multi-vif. once reservation is complete it will re-schedule the
1019          * work with no reserved_chanctx so verify chandef to check if it
1020          * completed successfully
1021          */
1022
1023         if (sdata->reserved_chanctx) {
1024                 /*
1025                  * with multi-vif csa driver may call ieee80211_csa_finish()
1026                  * many times while waiting for other interfaces to use their
1027                  * reservations
1028                  */
1029                 if (sdata->reserved_ready)
1030                         goto out;
1031
1032                 ret = ieee80211_vif_use_reserved_context(sdata);
1033                 if (ret) {
1034                         sdata_info(sdata,
1035                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1036                                    ret);
1037                         ieee80211_queue_work(&sdata->local->hw,
1038                                              &ifmgd->csa_connection_drop_work);
1039                         goto out;
1040                 }
1041
1042                 goto out;
1043         }
1044
1045         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1046                                         &sdata->csa_chandef)) {
1047                 sdata_info(sdata,
1048                            "failed to finalize channel switch, disconnecting\n");
1049                 ieee80211_queue_work(&sdata->local->hw,
1050                                      &ifmgd->csa_connection_drop_work);
1051                 goto out;
1052         }
1053
1054         /* XXX: shouldn't really modify cfg80211-owned data! */
1055         ifmgd->associated->channel = sdata->csa_chandef.chan;
1056
1057         ifmgd->csa_waiting_bcn = true;
1058
1059         ieee80211_sta_reset_beacon_monitor(sdata);
1060         ieee80211_sta_reset_conn_monitor(sdata);
1061
1062 out:
1063         mutex_unlock(&local->chanctx_mtx);
1064         mutex_unlock(&local->mtx);
1065         sdata_unlock(sdata);
1066 }
1067
1068 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1069 {
1070         struct ieee80211_local *local = sdata->local;
1071         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1072         int ret;
1073
1074         sdata_assert_lock(sdata);
1075
1076         WARN_ON(!sdata->vif.csa_active);
1077
1078         if (sdata->csa_block_tx) {
1079                 ieee80211_wake_vif_queues(local, sdata,
1080                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1081                 sdata->csa_block_tx = false;
1082         }
1083
1084         sdata->vif.csa_active = false;
1085         ifmgd->csa_waiting_bcn = false;
1086
1087         ret = drv_post_channel_switch(sdata);
1088         if (ret) {
1089                 sdata_info(sdata,
1090                            "driver post channel switch failed, disconnecting\n");
1091                 ieee80211_queue_work(&local->hw,
1092                                      &ifmgd->csa_connection_drop_work);
1093                 return;
1094         }
1095
1096         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1097 }
1098
1099 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1100 {
1101         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1102         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1103
1104         trace_api_chswitch_done(sdata, success);
1105         if (!success) {
1106                 sdata_info(sdata,
1107                            "driver channel switch failed, disconnecting\n");
1108                 ieee80211_queue_work(&sdata->local->hw,
1109                                      &ifmgd->csa_connection_drop_work);
1110         } else {
1111                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1112         }
1113 }
1114 EXPORT_SYMBOL(ieee80211_chswitch_done);
1115
1116 static void ieee80211_chswitch_timer(unsigned long data)
1117 {
1118         struct ieee80211_sub_if_data *sdata =
1119                 (struct ieee80211_sub_if_data *) data;
1120
1121         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1122 }
1123
1124 static void
1125 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1126                                  u64 timestamp, u32 device_timestamp,
1127                                  struct ieee802_11_elems *elems,
1128                                  bool beacon)
1129 {
1130         struct ieee80211_local *local = sdata->local;
1131         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1132         struct cfg80211_bss *cbss = ifmgd->associated;
1133         struct ieee80211_chanctx_conf *conf;
1134         struct ieee80211_chanctx *chanctx;
1135         enum ieee80211_band current_band;
1136         struct ieee80211_csa_ie csa_ie;
1137         struct ieee80211_channel_switch ch_switch;
1138         int res;
1139
1140         sdata_assert_lock(sdata);
1141
1142         if (!cbss)
1143                 return;
1144
1145         if (local->scanning)
1146                 return;
1147
1148         /* disregard subsequent announcements if we are already processing */
1149         if (sdata->vif.csa_active)
1150                 return;
1151
1152         current_band = cbss->channel->band;
1153         memset(&csa_ie, 0, sizeof(csa_ie));
1154         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1155                                            ifmgd->flags,
1156                                            ifmgd->associated->bssid, &csa_ie);
1157         if (res < 0)
1158                 ieee80211_queue_work(&local->hw,
1159                                      &ifmgd->csa_connection_drop_work);
1160         if (res)
1161                 return;
1162
1163         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1164                                      IEEE80211_CHAN_DISABLED)) {
1165                 sdata_info(sdata,
1166                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1167                            ifmgd->associated->bssid,
1168                            csa_ie.chandef.chan->center_freq,
1169                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1170                            csa_ie.chandef.center_freq2);
1171                 ieee80211_queue_work(&local->hw,
1172                                      &ifmgd->csa_connection_drop_work);
1173                 return;
1174         }
1175
1176         if (cfg80211_chandef_identical(&csa_ie.chandef,
1177                                        &sdata->vif.bss_conf.chandef)) {
1178                 if (ifmgd->csa_ignored_same_chan)
1179                         return;
1180                 sdata_info(sdata,
1181                            "AP %pM tries to chanswitch to same channel, ignore\n",
1182                            ifmgd->associated->bssid);
1183                 ifmgd->csa_ignored_same_chan = true;
1184                 return;
1185         }
1186
1187         /*
1188          * Drop all TDLS peers - either we disconnect or move to a different
1189          * channel from this point on. There's no telling what our peer will do.
1190          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1191          * have an incompatible wider chandef.
1192          */
1193         ieee80211_teardown_tdls_peers(sdata);
1194
1195         mutex_lock(&local->mtx);
1196         mutex_lock(&local->chanctx_mtx);
1197         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1198                                          lockdep_is_held(&local->chanctx_mtx));
1199         if (!conf) {
1200                 sdata_info(sdata,
1201                            "no channel context assigned to vif?, disconnecting\n");
1202                 goto drop_connection;
1203         }
1204
1205         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1206
1207         if (local->use_chanctx &&
1208             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1209                 sdata_info(sdata,
1210                            "driver doesn't support chan-switch with channel contexts\n");
1211                 goto drop_connection;
1212         }
1213
1214         ch_switch.timestamp = timestamp;
1215         ch_switch.device_timestamp = device_timestamp;
1216         ch_switch.block_tx = csa_ie.mode;
1217         ch_switch.chandef = csa_ie.chandef;
1218         ch_switch.count = csa_ie.count;
1219
1220         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1221                 sdata_info(sdata,
1222                            "preparing for channel switch failed, disconnecting\n");
1223                 goto drop_connection;
1224         }
1225
1226         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1227                                             chanctx->mode, false);
1228         if (res) {
1229                 sdata_info(sdata,
1230                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1231                            res);
1232                 goto drop_connection;
1233         }
1234         mutex_unlock(&local->chanctx_mtx);
1235
1236         sdata->vif.csa_active = true;
1237         sdata->csa_chandef = csa_ie.chandef;
1238         sdata->csa_block_tx = csa_ie.mode;
1239         ifmgd->csa_ignored_same_chan = false;
1240
1241         if (sdata->csa_block_tx)
1242                 ieee80211_stop_vif_queues(local, sdata,
1243                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1244         mutex_unlock(&local->mtx);
1245
1246         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1247                                           csa_ie.count);
1248
1249         if (local->ops->channel_switch) {
1250                 /* use driver's channel switch callback */
1251                 drv_channel_switch(local, sdata, &ch_switch);
1252                 return;
1253         }
1254
1255         /* channel switch handled in software */
1256         if (csa_ie.count <= 1)
1257                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1258         else
1259                 mod_timer(&ifmgd->chswitch_timer,
1260                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1261                                          cbss->beacon_interval));
1262         return;
1263  drop_connection:
1264         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1265         mutex_unlock(&local->chanctx_mtx);
1266         mutex_unlock(&local->mtx);
1267 }
1268
1269 static bool
1270 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1271                                  struct ieee80211_channel *channel,
1272                                  const u8 *country_ie, u8 country_ie_len,
1273                                  const u8 *pwr_constr_elem,
1274                                  int *chan_pwr, int *pwr_reduction)
1275 {
1276         struct ieee80211_country_ie_triplet *triplet;
1277         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1278         int i, chan_increment;
1279         bool have_chan_pwr = false;
1280
1281         /* Invalid IE */
1282         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1283                 return false;
1284
1285         triplet = (void *)(country_ie + 3);
1286         country_ie_len -= 3;
1287
1288         switch (channel->band) {
1289         default:
1290                 WARN_ON_ONCE(1);
1291                 /* fall through */
1292         case IEEE80211_BAND_2GHZ:
1293         case IEEE80211_BAND_60GHZ:
1294                 chan_increment = 1;
1295                 break;
1296         case IEEE80211_BAND_5GHZ:
1297                 chan_increment = 4;
1298                 break;
1299         }
1300
1301         /* find channel */
1302         while (country_ie_len >= 3) {
1303                 u8 first_channel = triplet->chans.first_channel;
1304
1305                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1306                         goto next;
1307
1308                 for (i = 0; i < triplet->chans.num_channels; i++) {
1309                         if (first_channel + i * chan_increment == chan) {
1310                                 have_chan_pwr = true;
1311                                 *chan_pwr = triplet->chans.max_power;
1312                                 break;
1313                         }
1314                 }
1315                 if (have_chan_pwr)
1316                         break;
1317
1318  next:
1319                 triplet++;
1320                 country_ie_len -= 3;
1321         }
1322
1323         if (have_chan_pwr && pwr_constr_elem)
1324                 *pwr_reduction = *pwr_constr_elem;
1325         else
1326                 *pwr_reduction = 0;
1327
1328         return have_chan_pwr;
1329 }
1330
1331 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1332                                       struct ieee80211_channel *channel,
1333                                       const u8 *cisco_dtpc_ie,
1334                                       int *pwr_level)
1335 {
1336         /* From practical testing, the first data byte of the DTPC element
1337          * seems to contain the requested dBm level, and the CLI on Cisco
1338          * APs clearly state the range is -127 to 127 dBm, which indicates
1339          * a signed byte, although it seemingly never actually goes negative.
1340          * The other byte seems to always be zero.
1341          */
1342         *pwr_level = (__s8)cisco_dtpc_ie[4];
1343 }
1344
1345 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1346                                        struct ieee80211_channel *channel,
1347                                        struct ieee80211_mgmt *mgmt,
1348                                        const u8 *country_ie, u8 country_ie_len,
1349                                        const u8 *pwr_constr_ie,
1350                                        const u8 *cisco_dtpc_ie)
1351 {
1352         bool has_80211h_pwr = false, has_cisco_pwr = false;
1353         int chan_pwr = 0, pwr_reduction_80211h = 0;
1354         int pwr_level_cisco, pwr_level_80211h;
1355         int new_ap_level;
1356         __le16 capab = mgmt->u.probe_resp.capab_info;
1357
1358         if (country_ie &&
1359             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1360              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1361                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1362                         sdata, channel, country_ie, country_ie_len,
1363                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1364                 pwr_level_80211h =
1365                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1366         }
1367
1368         if (cisco_dtpc_ie) {
1369                 ieee80211_find_cisco_dtpc(
1370                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1371                 has_cisco_pwr = true;
1372         }
1373
1374         if (!has_80211h_pwr && !has_cisco_pwr)
1375                 return 0;
1376
1377         /* If we have both 802.11h and Cisco DTPC, apply both limits
1378          * by picking the smallest of the two power levels advertised.
1379          */
1380         if (has_80211h_pwr &&
1381             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1382                 sdata_dbg(sdata,
1383                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1384                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1385                           sdata->u.mgd.bssid);
1386                 new_ap_level = pwr_level_80211h;
1387         } else {  /* has_cisco_pwr is always true here. */
1388                 sdata_dbg(sdata,
1389                           "Limiting TX power to %d dBm as advertised by %pM\n",
1390                           pwr_level_cisco, sdata->u.mgd.bssid);
1391                 new_ap_level = pwr_level_cisco;
1392         }
1393
1394         if (sdata->ap_power_level == new_ap_level)
1395                 return 0;
1396
1397         sdata->ap_power_level = new_ap_level;
1398         if (__ieee80211_recalc_txpower(sdata))
1399                 return BSS_CHANGED_TXPOWER;
1400         return 0;
1401 }
1402
1403 /* powersave */
1404 static void ieee80211_enable_ps(struct ieee80211_local *local,
1405                                 struct ieee80211_sub_if_data *sdata)
1406 {
1407         struct ieee80211_conf *conf = &local->hw.conf;
1408
1409         /*
1410          * If we are scanning right now then the parameters will
1411          * take effect when scan finishes.
1412          */
1413         if (local->scanning)
1414                 return;
1415
1416         if (conf->dynamic_ps_timeout > 0 &&
1417             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1418                 mod_timer(&local->dynamic_ps_timer, jiffies +
1419                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1420         } else {
1421                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1422                         ieee80211_send_nullfunc(local, sdata, true);
1423
1424                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1425                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1426                         return;
1427
1428                 conf->flags |= IEEE80211_CONF_PS;
1429                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1430         }
1431 }
1432
1433 static void ieee80211_change_ps(struct ieee80211_local *local)
1434 {
1435         struct ieee80211_conf *conf = &local->hw.conf;
1436
1437         if (local->ps_sdata) {
1438                 ieee80211_enable_ps(local, local->ps_sdata);
1439         } else if (conf->flags & IEEE80211_CONF_PS) {
1440                 conf->flags &= ~IEEE80211_CONF_PS;
1441                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1442                 del_timer_sync(&local->dynamic_ps_timer);
1443                 cancel_work_sync(&local->dynamic_ps_enable_work);
1444         }
1445 }
1446
1447 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1448 {
1449         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1450         struct sta_info *sta = NULL;
1451         bool authorized = false;
1452
1453         if (!mgd->powersave)
1454                 return false;
1455
1456         if (mgd->broken_ap)
1457                 return false;
1458
1459         if (!mgd->associated)
1460                 return false;
1461
1462         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1463                 return false;
1464
1465         if (!mgd->have_beacon)
1466                 return false;
1467
1468         rcu_read_lock();
1469         sta = sta_info_get(sdata, mgd->bssid);
1470         if (sta)
1471                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1472         rcu_read_unlock();
1473
1474         return authorized;
1475 }
1476
1477 /* need to hold RTNL or interface lock */
1478 void ieee80211_recalc_ps(struct ieee80211_local *local)
1479 {
1480         struct ieee80211_sub_if_data *sdata, *found = NULL;
1481         int count = 0;
1482         int timeout;
1483
1484         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1485                 local->ps_sdata = NULL;
1486                 return;
1487         }
1488
1489         list_for_each_entry(sdata, &local->interfaces, list) {
1490                 if (!ieee80211_sdata_running(sdata))
1491                         continue;
1492                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1493                         /* If an AP vif is found, then disable PS
1494                          * by setting the count to zero thereby setting
1495                          * ps_sdata to NULL.
1496                          */
1497                         count = 0;
1498                         break;
1499                 }
1500                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1501                         continue;
1502                 found = sdata;
1503                 count++;
1504         }
1505
1506         if (count == 1 && ieee80211_powersave_allowed(found)) {
1507                 u8 dtimper = found->u.mgd.dtim_period;
1508                 s32 beaconint_us;
1509
1510                 beaconint_us = ieee80211_tu_to_usec(
1511                                         found->vif.bss_conf.beacon_int);
1512
1513                 timeout = local->dynamic_ps_forced_timeout;
1514                 if (timeout < 0)
1515                         timeout = 100;
1516                 local->hw.conf.dynamic_ps_timeout = timeout;
1517
1518                 /* If the TIM IE is invalid, pretend the value is 1 */
1519                 if (!dtimper)
1520                         dtimper = 1;
1521
1522                 local->hw.conf.ps_dtim_period = dtimper;
1523                 local->ps_sdata = found;
1524         } else {
1525                 local->ps_sdata = NULL;
1526         }
1527
1528         ieee80211_change_ps(local);
1529 }
1530
1531 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1532 {
1533         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1534
1535         if (sdata->vif.bss_conf.ps != ps_allowed) {
1536                 sdata->vif.bss_conf.ps = ps_allowed;
1537                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1538         }
1539 }
1540
1541 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1542 {
1543         struct ieee80211_local *local =
1544                 container_of(work, struct ieee80211_local,
1545                              dynamic_ps_disable_work);
1546
1547         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1548                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1549                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1550         }
1551
1552         ieee80211_wake_queues_by_reason(&local->hw,
1553                                         IEEE80211_MAX_QUEUE_MAP,
1554                                         IEEE80211_QUEUE_STOP_REASON_PS,
1555                                         false);
1556 }
1557
1558 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1559 {
1560         struct ieee80211_local *local =
1561                 container_of(work, struct ieee80211_local,
1562                              dynamic_ps_enable_work);
1563         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1564         struct ieee80211_if_managed *ifmgd;
1565         unsigned long flags;
1566         int q;
1567
1568         /* can only happen when PS was just disabled anyway */
1569         if (!sdata)
1570                 return;
1571
1572         ifmgd = &sdata->u.mgd;
1573
1574         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1575                 return;
1576
1577         if (local->hw.conf.dynamic_ps_timeout > 0) {
1578                 /* don't enter PS if TX frames are pending */
1579                 if (drv_tx_frames_pending(local)) {
1580                         mod_timer(&local->dynamic_ps_timer, jiffies +
1581                                   msecs_to_jiffies(
1582                                   local->hw.conf.dynamic_ps_timeout));
1583                         return;
1584                 }
1585
1586                 /*
1587                  * transmission can be stopped by others which leads to
1588                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1589                  * is not the actual idle state.
1590                  */
1591                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1592                 for (q = 0; q < local->hw.queues; q++) {
1593                         if (local->queue_stop_reasons[q]) {
1594                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1595                                                        flags);
1596                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1597                                           msecs_to_jiffies(
1598                                           local->hw.conf.dynamic_ps_timeout));
1599                                 return;
1600                         }
1601                 }
1602                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1603         }
1604
1605         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1606             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1607                 if (drv_tx_frames_pending(local)) {
1608                         mod_timer(&local->dynamic_ps_timer, jiffies +
1609                                   msecs_to_jiffies(
1610                                   local->hw.conf.dynamic_ps_timeout));
1611                 } else {
1612                         ieee80211_send_nullfunc(local, sdata, true);
1613                         /* Flush to get the tx status of nullfunc frame */
1614                         ieee80211_flush_queues(local, sdata, false);
1615                 }
1616         }
1617
1618         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1619               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1620             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1621                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1622                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1623                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1624         }
1625 }
1626
1627 void ieee80211_dynamic_ps_timer(unsigned long data)
1628 {
1629         struct ieee80211_local *local = (void *) data;
1630
1631         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1632 }
1633
1634 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1635 {
1636         struct delayed_work *delayed_work =
1637                 container_of(work, struct delayed_work, work);
1638         struct ieee80211_sub_if_data *sdata =
1639                 container_of(delayed_work, struct ieee80211_sub_if_data,
1640                              dfs_cac_timer_work);
1641         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1642
1643         mutex_lock(&sdata->local->mtx);
1644         if (sdata->wdev.cac_started) {
1645                 ieee80211_vif_release_channel(sdata);
1646                 cfg80211_cac_event(sdata->dev, &chandef,
1647                                    NL80211_RADAR_CAC_FINISHED,
1648                                    GFP_KERNEL);
1649         }
1650         mutex_unlock(&sdata->local->mtx);
1651 }
1652
1653 static bool
1654 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1655 {
1656         struct ieee80211_local *local = sdata->local;
1657         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1658         bool ret = false;
1659         int ac;
1660
1661         if (local->hw.queues < IEEE80211_NUM_ACS)
1662                 return false;
1663
1664         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1665                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1666                 int non_acm_ac;
1667                 unsigned long now = jiffies;
1668
1669                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1670                     tx_tspec->admitted_time &&
1671                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1672                         tx_tspec->consumed_tx_time = 0;
1673                         tx_tspec->time_slice_start = now;
1674
1675                         if (tx_tspec->downgraded)
1676                                 tx_tspec->action =
1677                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1678                 }
1679
1680                 switch (tx_tspec->action) {
1681                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1682                         /* take the original parameters */
1683                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1684                                 sdata_err(sdata,
1685                                           "failed to set TX queue parameters for queue %d\n",
1686                                           ac);
1687                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1688                         tx_tspec->downgraded = false;
1689                         ret = true;
1690                         break;
1691                 case TX_TSPEC_ACTION_DOWNGRADE:
1692                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1693                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1694                                 ret = true;
1695                                 break;
1696                         }
1697                         /* downgrade next lower non-ACM AC */
1698                         for (non_acm_ac = ac + 1;
1699                              non_acm_ac < IEEE80211_NUM_ACS;
1700                              non_acm_ac++)
1701                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1702                                         break;
1703                         /* The loop will result in using BK even if it requires
1704                          * admission control, such configuration makes no sense
1705                          * and we have to transmit somehow - the AC selection
1706                          * does the same thing.
1707                          */
1708                         if (drv_conf_tx(local, sdata, ac,
1709                                         &sdata->tx_conf[non_acm_ac]))
1710                                 sdata_err(sdata,
1711                                           "failed to set TX queue parameters for queue %d\n",
1712                                           ac);
1713                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1714                         ret = true;
1715                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1716                                 tx_tspec->time_slice_start + HZ - now + 1);
1717                         break;
1718                 case TX_TSPEC_ACTION_NONE:
1719                         /* nothing now */
1720                         break;
1721                 }
1722         }
1723
1724         return ret;
1725 }
1726
1727 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1728 {
1729         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1730                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1731 }
1732
1733 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1734 {
1735         struct ieee80211_sub_if_data *sdata;
1736
1737         sdata = container_of(work, struct ieee80211_sub_if_data,
1738                              u.mgd.tx_tspec_wk.work);
1739         ieee80211_sta_handle_tspec_ac_params(sdata);
1740 }
1741
1742 /* MLME */
1743 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1744                                      struct ieee80211_sub_if_data *sdata,
1745                                      const u8 *wmm_param, size_t wmm_param_len)
1746 {
1747         struct ieee80211_tx_queue_params params;
1748         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1749         size_t left;
1750         int count;
1751         const u8 *pos;
1752         u8 uapsd_queues = 0;
1753
1754         if (!local->ops->conf_tx)
1755                 return false;
1756
1757         if (local->hw.queues < IEEE80211_NUM_ACS)
1758                 return false;
1759
1760         if (!wmm_param)
1761                 return false;
1762
1763         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1764                 return false;
1765
1766         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1767                 uapsd_queues = ifmgd->uapsd_queues;
1768
1769         count = wmm_param[6] & 0x0f;
1770         if (count == ifmgd->wmm_last_param_set)
1771                 return false;
1772         ifmgd->wmm_last_param_set = count;
1773
1774         pos = wmm_param + 8;
1775         left = wmm_param_len - 8;
1776
1777         memset(&params, 0, sizeof(params));
1778
1779         sdata->wmm_acm = 0;
1780         for (; left >= 4; left -= 4, pos += 4) {
1781                 int aci = (pos[0] >> 5) & 0x03;
1782                 int acm = (pos[0] >> 4) & 0x01;
1783                 bool uapsd = false;
1784                 int queue;
1785
1786                 switch (aci) {
1787                 case 1: /* AC_BK */
1788                         queue = 3;
1789                         if (acm)
1790                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1791                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1792                                 uapsd = true;
1793                         break;
1794                 case 2: /* AC_VI */
1795                         queue = 1;
1796                         if (acm)
1797                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1798                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1799                                 uapsd = true;
1800                         break;
1801                 case 3: /* AC_VO */
1802                         queue = 0;
1803                         if (acm)
1804                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1805                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1806                                 uapsd = true;
1807                         break;
1808                 case 0: /* AC_BE */
1809                 default:
1810                         queue = 2;
1811                         if (acm)
1812                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1813                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1814                                 uapsd = true;
1815                         break;
1816                 }
1817
1818                 params.aifs = pos[0] & 0x0f;
1819                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1820                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1821                 params.txop = get_unaligned_le16(pos + 2);
1822                 params.acm = acm;
1823                 params.uapsd = uapsd;
1824
1825                 mlme_dbg(sdata,
1826                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1827                          queue, aci, acm,
1828                          params.aifs, params.cw_min, params.cw_max,
1829                          params.txop, params.uapsd,
1830                          ifmgd->tx_tspec[queue].downgraded);
1831                 sdata->tx_conf[queue] = params;
1832                 if (!ifmgd->tx_tspec[queue].downgraded &&
1833                     drv_conf_tx(local, sdata, queue, &params))
1834                         sdata_err(sdata,
1835                                   "failed to set TX queue parameters for queue %d\n",
1836                                   queue);
1837         }
1838
1839         /* enable WMM or activate new settings */
1840         sdata->vif.bss_conf.qos = true;
1841         return true;
1842 }
1843
1844 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1845 {
1846         lockdep_assert_held(&sdata->local->mtx);
1847
1848         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1849         ieee80211_run_deferred_scan(sdata->local);
1850 }
1851
1852 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1853 {
1854         mutex_lock(&sdata->local->mtx);
1855         __ieee80211_stop_poll(sdata);
1856         mutex_unlock(&sdata->local->mtx);
1857 }
1858
1859 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1860                                            u16 capab, bool erp_valid, u8 erp)
1861 {
1862         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1863         u32 changed = 0;
1864         bool use_protection;
1865         bool use_short_preamble;
1866         bool use_short_slot;
1867
1868         if (erp_valid) {
1869                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1870                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1871         } else {
1872                 use_protection = false;
1873                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1874         }
1875
1876         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1877         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1878                 use_short_slot = true;
1879
1880         if (use_protection != bss_conf->use_cts_prot) {
1881                 bss_conf->use_cts_prot = use_protection;
1882                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1883         }
1884
1885         if (use_short_preamble != bss_conf->use_short_preamble) {
1886                 bss_conf->use_short_preamble = use_short_preamble;
1887                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1888         }
1889
1890         if (use_short_slot != bss_conf->use_short_slot) {
1891                 bss_conf->use_short_slot = use_short_slot;
1892                 changed |= BSS_CHANGED_ERP_SLOT;
1893         }
1894
1895         return changed;
1896 }
1897
1898 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1899                                      struct cfg80211_bss *cbss,
1900                                      u32 bss_info_changed)
1901 {
1902         struct ieee80211_bss *bss = (void *)cbss->priv;
1903         struct ieee80211_local *local = sdata->local;
1904         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1905
1906         bss_info_changed |= BSS_CHANGED_ASSOC;
1907         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1908                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1909
1910         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1911                 beacon_loss_count * bss_conf->beacon_int));
1912
1913         sdata->u.mgd.associated = cbss;
1914         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1915
1916         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1917
1918         if (sdata->vif.p2p) {
1919                 const struct cfg80211_bss_ies *ies;
1920
1921                 rcu_read_lock();
1922                 ies = rcu_dereference(cbss->ies);
1923                 if (ies) {
1924                         int ret;
1925
1926                         ret = cfg80211_get_p2p_attr(
1927                                         ies->data, ies->len,
1928                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1929                                         (u8 *) &bss_conf->p2p_noa_attr,
1930                                         sizeof(bss_conf->p2p_noa_attr));
1931                         if (ret >= 2) {
1932                                 sdata->u.mgd.p2p_noa_index =
1933                                         bss_conf->p2p_noa_attr.index;
1934                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1935                         }
1936                 }
1937                 rcu_read_unlock();
1938         }
1939
1940         /* just to be sure */
1941         ieee80211_stop_poll(sdata);
1942
1943         ieee80211_led_assoc(local, 1);
1944
1945         if (sdata->u.mgd.have_beacon) {
1946                 /*
1947                  * If the AP is buggy we may get here with no DTIM period
1948                  * known, so assume it's 1 which is the only safe assumption
1949                  * in that case, although if the TIM IE is broken powersave
1950                  * probably just won't work at all.
1951                  */
1952                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1953                 bss_conf->beacon_rate = bss->beacon_rate;
1954                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1955         } else {
1956                 bss_conf->beacon_rate = NULL;
1957                 bss_conf->dtim_period = 0;
1958         }
1959
1960         bss_conf->assoc = 1;
1961
1962         /* Tell the driver to monitor connection quality (if supported) */
1963         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1964             bss_conf->cqm_rssi_thold)
1965                 bss_info_changed |= BSS_CHANGED_CQM;
1966
1967         /* Enable ARP filtering */
1968         if (bss_conf->arp_addr_cnt)
1969                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1970
1971         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1972
1973         mutex_lock(&local->iflist_mtx);
1974         ieee80211_recalc_ps(local);
1975         mutex_unlock(&local->iflist_mtx);
1976
1977         ieee80211_recalc_smps(sdata);
1978         ieee80211_recalc_ps_vif(sdata);
1979
1980         netif_carrier_on(sdata->dev);
1981 }
1982
1983 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1984                                    u16 stype, u16 reason, bool tx,
1985                                    u8 *frame_buf)
1986 {
1987         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1988         struct ieee80211_local *local = sdata->local;
1989         u32 changed = 0;
1990
1991         sdata_assert_lock(sdata);
1992
1993         if (WARN_ON_ONCE(tx && !frame_buf))
1994                 return;
1995
1996         if (WARN_ON(!ifmgd->associated))
1997                 return;
1998
1999         ieee80211_stop_poll(sdata);
2000
2001         ifmgd->associated = NULL;
2002         netif_carrier_off(sdata->dev);
2003
2004         /*
2005          * if we want to get out of ps before disassoc (why?) we have
2006          * to do it before sending disassoc, as otherwise the null-packet
2007          * won't be valid.
2008          */
2009         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2010                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2011                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2012         }
2013         local->ps_sdata = NULL;
2014
2015         /* disable per-vif ps */
2016         ieee80211_recalc_ps_vif(sdata);
2017
2018         /* make sure ongoing transmission finishes */
2019         synchronize_net();
2020
2021         /*
2022          * drop any frame before deauth/disassoc, this can be data or
2023          * management frame. Since we are disconnecting, we should not
2024          * insist sending these frames which can take time and delay
2025          * the disconnection and possible the roaming.
2026          */
2027         if (tx)
2028                 ieee80211_flush_queues(local, sdata, true);
2029
2030         /* deauthenticate/disassociate now */
2031         if (tx || frame_buf)
2032                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2033                                                reason, tx, frame_buf);
2034
2035         /* flush out frame - make sure the deauth was actually sent */
2036         if (tx)
2037                 ieee80211_flush_queues(local, sdata, false);
2038
2039         /* clear bssid only after building the needed mgmt frames */
2040         eth_zero_addr(ifmgd->bssid);
2041
2042         /* remove AP and TDLS peers */
2043         sta_info_flush(sdata);
2044
2045         /* finally reset all BSS / config parameters */
2046         changed |= ieee80211_reset_erp_info(sdata);
2047
2048         ieee80211_led_assoc(local, 0);
2049         changed |= BSS_CHANGED_ASSOC;
2050         sdata->vif.bss_conf.assoc = false;
2051
2052         ifmgd->p2p_noa_index = -1;
2053         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2054                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2055
2056         /* on the next assoc, re-program HT/VHT parameters */
2057         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2058         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2059         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2060         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2061         sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2062
2063         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2064
2065         del_timer_sync(&local->dynamic_ps_timer);
2066         cancel_work_sync(&local->dynamic_ps_enable_work);
2067
2068         /* Disable ARP filtering */
2069         if (sdata->vif.bss_conf.arp_addr_cnt)
2070                 changed |= BSS_CHANGED_ARP_FILTER;
2071
2072         sdata->vif.bss_conf.qos = false;
2073         changed |= BSS_CHANGED_QOS;
2074
2075         /* The BSSID (not really interesting) and HT changed */
2076         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2077         ieee80211_bss_info_change_notify(sdata, changed);
2078
2079         /* disassociated - set to defaults now */
2080         ieee80211_set_wmm_default(sdata, false);
2081
2082         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2083         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2084         del_timer_sync(&sdata->u.mgd.timer);
2085         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2086
2087         sdata->vif.bss_conf.dtim_period = 0;
2088         sdata->vif.bss_conf.beacon_rate = NULL;
2089
2090         ifmgd->have_beacon = false;
2091
2092         ifmgd->flags = 0;
2093         mutex_lock(&local->mtx);
2094         ieee80211_vif_release_channel(sdata);
2095
2096         sdata->vif.csa_active = false;
2097         ifmgd->csa_waiting_bcn = false;
2098         ifmgd->csa_ignored_same_chan = false;
2099         if (sdata->csa_block_tx) {
2100                 ieee80211_wake_vif_queues(local, sdata,
2101                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2102                 sdata->csa_block_tx = false;
2103         }
2104         mutex_unlock(&local->mtx);
2105
2106         /* existing TX TSPEC sessions no longer exist */
2107         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2108         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2109
2110         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2111 }
2112
2113 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2114                              struct ieee80211_hdr *hdr)
2115 {
2116         /*
2117          * We can postpone the mgd.timer whenever receiving unicast frames
2118          * from AP because we know that the connection is working both ways
2119          * at that time. But multicast frames (and hence also beacons) must
2120          * be ignored here, because we need to trigger the timer during
2121          * data idle periods for sending the periodic probe request to the
2122          * AP we're connected to.
2123          */
2124         if (is_multicast_ether_addr(hdr->addr1))
2125                 return;
2126
2127         ieee80211_sta_reset_conn_monitor(sdata);
2128 }
2129
2130 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2131 {
2132         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2133         struct ieee80211_local *local = sdata->local;
2134
2135         mutex_lock(&local->mtx);
2136         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2137                 goto out;
2138
2139         __ieee80211_stop_poll(sdata);
2140
2141         mutex_lock(&local->iflist_mtx);
2142         ieee80211_recalc_ps(local);
2143         mutex_unlock(&local->iflist_mtx);
2144
2145         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2146                 goto out;
2147
2148         /*
2149          * We've received a probe response, but are not sure whether
2150          * we have or will be receiving any beacons or data, so let's
2151          * schedule the timers again, just in case.
2152          */
2153         ieee80211_sta_reset_beacon_monitor(sdata);
2154
2155         mod_timer(&ifmgd->conn_mon_timer,
2156                   round_jiffies_up(jiffies +
2157                                    IEEE80211_CONNECTION_IDLE_TIME));
2158 out:
2159         mutex_unlock(&local->mtx);
2160 }
2161
2162 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2163                                            struct ieee80211_hdr *hdr,
2164                                            u16 tx_time)
2165 {
2166         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2167         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2168         int ac = ieee80211_ac_from_tid(tid);
2169         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2170         unsigned long now = jiffies;
2171
2172         if (likely(!tx_tspec->admitted_time))
2173                 return;
2174
2175         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2176                 tx_tspec->consumed_tx_time = 0;
2177                 tx_tspec->time_slice_start = now;
2178
2179                 if (tx_tspec->downgraded) {
2180                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2181                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2182                 }
2183         }
2184
2185         if (tx_tspec->downgraded)
2186                 return;
2187
2188         tx_tspec->consumed_tx_time += tx_time;
2189
2190         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2191                 tx_tspec->downgraded = true;
2192                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2193                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2194         }
2195 }
2196
2197 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2198                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2199 {
2200         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2201
2202         if (!ieee80211_is_data(hdr->frame_control))
2203             return;
2204
2205         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2206             sdata->u.mgd.probe_send_count > 0) {
2207                 if (ack)
2208                         ieee80211_sta_reset_conn_monitor(sdata);
2209                 else
2210                         sdata->u.mgd.nullfunc_failed = true;
2211                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2212                 return;
2213         }
2214
2215         if (ack)
2216                 ieee80211_sta_reset_conn_monitor(sdata);
2217 }
2218
2219 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2220 {
2221         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2222         const u8 *ssid;
2223         u8 *dst = ifmgd->associated->bssid;
2224         u8 unicast_limit = max(1, max_probe_tries - 3);
2225
2226         /*
2227          * Try sending broadcast probe requests for the last three
2228          * probe requests after the first ones failed since some
2229          * buggy APs only support broadcast probe requests.
2230          */
2231         if (ifmgd->probe_send_count >= unicast_limit)
2232                 dst = NULL;
2233
2234         /*
2235          * When the hardware reports an accurate Tx ACK status, it's
2236          * better to send a nullfunc frame instead of a probe request,
2237          * as it will kick us off the AP quickly if we aren't associated
2238          * anymore. The timeout will be reset if the frame is ACKed by
2239          * the AP.
2240          */
2241         ifmgd->probe_send_count++;
2242
2243         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2244                 ifmgd->nullfunc_failed = false;
2245                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2246         } else {
2247                 int ssid_len;
2248
2249                 rcu_read_lock();
2250                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2251                 if (WARN_ON_ONCE(ssid == NULL))
2252                         ssid_len = 0;
2253                 else
2254                         ssid_len = ssid[1];
2255
2256                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2257                                          ssid + 2, ssid_len, NULL,
2258                                          0, (u32) -1, true, 0,
2259                                          ifmgd->associated->channel, false);
2260                 rcu_read_unlock();
2261         }
2262
2263         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2264         run_again(sdata, ifmgd->probe_timeout);
2265 }
2266
2267 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2268                                    bool beacon)
2269 {
2270         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2271         bool already = false;
2272
2273         if (!ieee80211_sdata_running(sdata))
2274                 return;
2275
2276         sdata_lock(sdata);
2277
2278         if (!ifmgd->associated)
2279                 goto out;
2280
2281         mutex_lock(&sdata->local->mtx);
2282
2283         if (sdata->local->tmp_channel || sdata->local->scanning) {
2284                 mutex_unlock(&sdata->local->mtx);
2285                 goto out;
2286         }
2287
2288         if (beacon) {
2289                 mlme_dbg_ratelimited(sdata,
2290                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2291                                      beacon_loss_count);
2292
2293                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2294         }
2295
2296         /*
2297          * The driver/our work has already reported this event or the
2298          * connection monitoring has kicked in and we have already sent
2299          * a probe request. Or maybe the AP died and the driver keeps
2300          * reporting until we disassociate...
2301          *
2302          * In either case we have to ignore the current call to this
2303          * function (except for setting the correct probe reason bit)
2304          * because otherwise we would reset the timer every time and
2305          * never check whether we received a probe response!
2306          */
2307         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2308                 already = true;
2309
2310         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2311
2312         mutex_unlock(&sdata->local->mtx);
2313
2314         if (already)
2315                 goto out;
2316
2317         mutex_lock(&sdata->local->iflist_mtx);
2318         ieee80211_recalc_ps(sdata->local);
2319         mutex_unlock(&sdata->local->iflist_mtx);
2320
2321         ifmgd->probe_send_count = 0;
2322         ieee80211_mgd_probe_ap_send(sdata);
2323  out:
2324         sdata_unlock(sdata);
2325 }
2326
2327 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2328                                           struct ieee80211_vif *vif)
2329 {
2330         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2331         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2332         struct cfg80211_bss *cbss;
2333         struct sk_buff *skb;
2334         const u8 *ssid;
2335         int ssid_len;
2336
2337         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2338                 return NULL;
2339
2340         sdata_assert_lock(sdata);
2341
2342         if (ifmgd->associated)
2343                 cbss = ifmgd->associated;
2344         else if (ifmgd->auth_data)
2345                 cbss = ifmgd->auth_data->bss;
2346         else if (ifmgd->assoc_data)
2347                 cbss = ifmgd->assoc_data->bss;
2348         else
2349                 return NULL;
2350
2351         rcu_read_lock();
2352         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2353         if (WARN_ON_ONCE(ssid == NULL))
2354                 ssid_len = 0;
2355         else
2356                 ssid_len = ssid[1];
2357
2358         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2359                                         (u32) -1, cbss->channel,
2360                                         ssid + 2, ssid_len,
2361                                         NULL, 0, true);
2362         rcu_read_unlock();
2363
2364         return skb;
2365 }
2366 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2367
2368 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2369                                         const u8 *buf, size_t len, bool tx,
2370                                         u16 reason)
2371 {
2372         struct ieee80211_event event = {
2373                 .type = MLME_EVENT,
2374                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2375                 .u.mlme.reason = reason,
2376         };
2377
2378         if (tx)
2379                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2380         else
2381                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2382
2383         drv_event_callback(sdata->local, sdata, &event);
2384 }
2385
2386 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2387 {
2388         struct ieee80211_local *local = sdata->local;
2389         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2390         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2391
2392         sdata_lock(sdata);
2393         if (!ifmgd->associated) {
2394                 sdata_unlock(sdata);
2395                 return;
2396         }
2397
2398         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2399                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2400                                true, frame_buf);
2401         mutex_lock(&local->mtx);
2402         sdata->vif.csa_active = false;
2403         ifmgd->csa_waiting_bcn = false;
2404         if (sdata->csa_block_tx) {
2405                 ieee80211_wake_vif_queues(local, sdata,
2406                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2407                 sdata->csa_block_tx = false;
2408         }
2409         mutex_unlock(&local->mtx);
2410
2411         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2412                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2413
2414         sdata_unlock(sdata);
2415 }
2416
2417 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2418 {
2419         struct ieee80211_sub_if_data *sdata =
2420                 container_of(work, struct ieee80211_sub_if_data,
2421                              u.mgd.beacon_connection_loss_work);
2422         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2423
2424         if (ifmgd->associated)
2425                 ifmgd->beacon_loss_count++;
2426
2427         if (ifmgd->connection_loss) {
2428                 sdata_info(sdata, "Connection to AP %pM lost\n",
2429                            ifmgd->bssid);
2430                 __ieee80211_disconnect(sdata);
2431         } else {
2432                 ieee80211_mgd_probe_ap(sdata, true);
2433         }
2434 }
2435
2436 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2437 {
2438         struct ieee80211_sub_if_data *sdata =
2439                 container_of(work, struct ieee80211_sub_if_data,
2440                              u.mgd.csa_connection_drop_work);
2441
2442         __ieee80211_disconnect(sdata);
2443 }
2444
2445 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2446 {
2447         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2448         struct ieee80211_hw *hw = &sdata->local->hw;
2449
2450         trace_api_beacon_loss(sdata);
2451
2452         sdata->u.mgd.connection_loss = false;
2453         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2454 }
2455 EXPORT_SYMBOL(ieee80211_beacon_loss);
2456
2457 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2458 {
2459         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2460         struct ieee80211_hw *hw = &sdata->local->hw;
2461
2462         trace_api_connection_loss(sdata);
2463
2464         sdata->u.mgd.connection_loss = true;
2465         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2466 }
2467 EXPORT_SYMBOL(ieee80211_connection_loss);
2468
2469
2470 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2471                                         bool assoc)
2472 {
2473         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2474
2475         sdata_assert_lock(sdata);
2476
2477         if (!assoc) {
2478                 /*
2479                  * we are not authenticated yet, the only timer that could be
2480                  * running is the timeout for the authentication response which
2481                  * which is not relevant anymore.
2482                  */
2483                 del_timer_sync(&sdata->u.mgd.timer);
2484                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2485
2486                 eth_zero_addr(sdata->u.mgd.bssid);
2487                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2488                 sdata->u.mgd.flags = 0;
2489                 mutex_lock(&sdata->local->mtx);
2490                 ieee80211_vif_release_channel(sdata);
2491                 mutex_unlock(&sdata->local->mtx);
2492         }
2493
2494         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2495         kfree(auth_data);
2496         sdata->u.mgd.auth_data = NULL;
2497 }
2498
2499 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2500                                          bool assoc)
2501 {
2502         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2503
2504         sdata_assert_lock(sdata);
2505
2506         if (!assoc) {
2507                 /*
2508                  * we are not associated yet, the only timer that could be
2509                  * running is the timeout for the association response which
2510                  * which is not relevant anymore.
2511                  */
2512                 del_timer_sync(&sdata->u.mgd.timer);
2513                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2514
2515                 eth_zero_addr(sdata->u.mgd.bssid);
2516                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2517                 sdata->u.mgd.flags = 0;
2518                 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2519                 mutex_lock(&sdata->local->mtx);
2520                 ieee80211_vif_release_channel(sdata);
2521                 mutex_unlock(&sdata->local->mtx);
2522         }
2523
2524         kfree(assoc_data);
2525         sdata->u.mgd.assoc_data = NULL;
2526 }
2527
2528 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2529                                      struct ieee80211_mgmt *mgmt, size_t len)
2530 {
2531         struct ieee80211_local *local = sdata->local;
2532         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2533         u8 *pos;
2534         struct ieee802_11_elems elems;
2535         u32 tx_flags = 0;
2536
2537         pos = mgmt->u.auth.variable;
2538         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2539         if (!elems.challenge)
2540                 return;
2541         auth_data->expected_transaction = 4;
2542         drv_mgd_prepare_tx(sdata->local, sdata);
2543         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2544                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2545                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2546         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2547                             elems.challenge - 2, elems.challenge_len + 2,
2548                             auth_data->bss->bssid, auth_data->bss->bssid,
2549                             auth_data->key, auth_data->key_len,
2550                             auth_data->key_idx, tx_flags);
2551 }
2552
2553 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2554                                    struct ieee80211_mgmt *mgmt, size_t len)
2555 {
2556         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2557         u8 bssid[ETH_ALEN];
2558         u16 auth_alg, auth_transaction, status_code;
2559         struct sta_info *sta;
2560         struct ieee80211_event event = {
2561                 .type = MLME_EVENT,
2562                 .u.mlme.data = AUTH_EVENT,
2563         };
2564
2565         sdata_assert_lock(sdata);
2566
2567         if (len < 24 + 6)
2568                 return;
2569
2570         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2571                 return;
2572
2573         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2574
2575         if (!ether_addr_equal(bssid, mgmt->bssid))
2576                 return;
2577
2578         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2579         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2580         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2581
2582         if (auth_alg != ifmgd->auth_data->algorithm ||
2583             auth_transaction != ifmgd->auth_data->expected_transaction) {
2584                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2585                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2586                            auth_transaction,
2587                            ifmgd->auth_data->expected_transaction);
2588                 return;
2589         }
2590
2591         if (status_code != WLAN_STATUS_SUCCESS) {
2592                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2593                            mgmt->sa, status_code);
2594                 ieee80211_destroy_auth_data(sdata, false);
2595                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2596                 event.u.mlme.status = MLME_DENIED;
2597                 event.u.mlme.reason = status_code;
2598                 drv_event_callback(sdata->local, sdata, &event);
2599                 return;
2600         }
2601
2602         switch (ifmgd->auth_data->algorithm) {
2603         case WLAN_AUTH_OPEN:
2604         case WLAN_AUTH_LEAP:
2605         case WLAN_AUTH_FT:
2606         case WLAN_AUTH_SAE:
2607                 break;
2608         case WLAN_AUTH_SHARED_KEY:
2609                 if (ifmgd->auth_data->expected_transaction != 4) {
2610                         ieee80211_auth_challenge(sdata, mgmt, len);
2611                         /* need another frame */
2612                         return;
2613                 }
2614                 break;
2615         default:
2616                 WARN_ONCE(1, "invalid auth alg %d",
2617                           ifmgd->auth_data->algorithm);
2618                 return;
2619         }
2620
2621         event.u.mlme.status = MLME_SUCCESS;
2622         drv_event_callback(sdata->local, sdata, &event);
2623         sdata_info(sdata, "authenticated\n");
2624         ifmgd->auth_data->done = true;
2625         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2626         ifmgd->auth_data->timeout_started = true;
2627         run_again(sdata, ifmgd->auth_data->timeout);
2628
2629         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2630             ifmgd->auth_data->expected_transaction != 2) {
2631                 /*
2632                  * Report auth frame to user space for processing since another
2633                  * round of Authentication frames is still needed.
2634                  */
2635                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2636                 return;
2637         }
2638
2639         /* move station state to auth */
2640         mutex_lock(&sdata->local->sta_mtx);
2641         sta = sta_info_get(sdata, bssid);
2642         if (!sta) {
2643                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2644                 goto out_err;
2645         }
2646         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2647                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2648                 goto out_err;
2649         }
2650         mutex_unlock(&sdata->local->sta_mtx);
2651
2652         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2653         return;
2654  out_err:
2655         mutex_unlock(&sdata->local->sta_mtx);
2656         /* ignore frame -- wait for timeout */
2657 }
2658
2659 #define case_WLAN(type) \
2660         case WLAN_REASON_##type: return #type
2661
2662 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2663 {
2664         switch (reason_code) {
2665         case_WLAN(UNSPECIFIED);
2666         case_WLAN(PREV_AUTH_NOT_VALID);
2667         case_WLAN(DEAUTH_LEAVING);
2668         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2669         case_WLAN(DISASSOC_AP_BUSY);
2670         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2671         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2672         case_WLAN(DISASSOC_STA_HAS_LEFT);
2673         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2674         case_WLAN(DISASSOC_BAD_POWER);
2675         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2676         case_WLAN(INVALID_IE);
2677         case_WLAN(MIC_FAILURE);
2678         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2679         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2680         case_WLAN(IE_DIFFERENT);
2681         case_WLAN(INVALID_GROUP_CIPHER);
2682         case_WLAN(INVALID_PAIRWISE_CIPHER);
2683         case_WLAN(INVALID_AKMP);
2684         case_WLAN(UNSUPP_RSN_VERSION);
2685         case_WLAN(INVALID_RSN_IE_CAP);
2686         case_WLAN(IEEE8021X_FAILED);
2687         case_WLAN(CIPHER_SUITE_REJECTED);
2688         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2689         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2690         case_WLAN(DISASSOC_LOW_ACK);
2691         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2692         case_WLAN(QSTA_LEAVE_QBSS);
2693         case_WLAN(QSTA_NOT_USE);
2694         case_WLAN(QSTA_REQUIRE_SETUP);
2695         case_WLAN(QSTA_TIMEOUT);
2696         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2697         case_WLAN(MESH_PEER_CANCELED);
2698         case_WLAN(MESH_MAX_PEERS);
2699         case_WLAN(MESH_CONFIG);
2700         case_WLAN(MESH_CLOSE);
2701         case_WLAN(MESH_MAX_RETRIES);
2702         case_WLAN(MESH_CONFIRM_TIMEOUT);
2703         case_WLAN(MESH_INVALID_GTK);
2704         case_WLAN(MESH_INCONSISTENT_PARAM);
2705         case_WLAN(MESH_INVALID_SECURITY);
2706         case_WLAN(MESH_PATH_ERROR);
2707         case_WLAN(MESH_PATH_NOFORWARD);
2708         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2709         case_WLAN(MAC_EXISTS_IN_MBSS);
2710         case_WLAN(MESH_CHAN_REGULATORY);
2711         case_WLAN(MESH_CHAN);
2712         default: return "<unknown>";
2713         }
2714 }
2715
2716 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2717                                      struct ieee80211_mgmt *mgmt, size_t len)
2718 {
2719         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2720         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2721
2722         sdata_assert_lock(sdata);
2723
2724         if (len < 24 + 2)
2725                 return;
2726
2727         if (ifmgd->associated &&
2728             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2729                 const u8 *bssid = ifmgd->associated->bssid;
2730
2731                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2732                            bssid, reason_code,
2733                            ieee80211_get_reason_code_string(reason_code));
2734
2735                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2736
2737                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2738                                             reason_code);
2739                 return;
2740         }
2741
2742         if (ifmgd->assoc_data &&
2743             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2744                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2745
2746                 sdata_info(sdata,
2747                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2748                            bssid, reason_code,
2749                            ieee80211_get_reason_code_string(reason_code));
2750
2751                 ieee80211_destroy_assoc_data(sdata, false);
2752
2753                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2754                 return;
2755         }
2756 }
2757
2758
2759 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2760                                        struct ieee80211_mgmt *mgmt, size_t len)
2761 {
2762         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2763         u16 reason_code;
2764
2765         sdata_assert_lock(sdata);
2766
2767         if (len < 24 + 2)
2768                 return;
2769
2770         if (!ifmgd->associated ||
2771             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2772                 return;
2773
2774         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2775
2776         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2777                    mgmt->sa, reason_code);
2778
2779         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2780
2781         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2782 }
2783
2784 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2785                                 u8 *supp_rates, unsigned int supp_rates_len,
2786                                 u32 *rates, u32 *basic_rates,
2787                                 bool *have_higher_than_11mbit,
2788                                 int *min_rate, int *min_rate_index,
2789                                 int shift, u32 rate_flags)
2790 {
2791         int i, j;
2792
2793         for (i = 0; i < supp_rates_len; i++) {
2794                 int rate = supp_rates[i] & 0x7f;
2795                 bool is_basic = !!(supp_rates[i] & 0x80);
2796
2797                 if ((rate * 5 * (1 << shift)) > 110)
2798                         *have_higher_than_11mbit = true;
2799
2800                 /*
2801                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2802                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2803                  *
2804                  * Note: Even through the membership selector and the basic
2805                  *       rate flag share the same bit, they are not exactly
2806                  *       the same.
2807                  */
2808                 if (!!(supp_rates[i] & 0x80) &&
2809                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2810                         continue;
2811
2812                 for (j = 0; j < sband->n_bitrates; j++) {
2813                         struct ieee80211_rate *br;
2814                         int brate;
2815
2816                         br = &sband->bitrates[j];
2817                         if ((rate_flags & br->flags) != rate_flags)
2818                                 continue;
2819
2820                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2821                         if (brate == rate) {
2822                                 *rates |= BIT(j);
2823                                 if (is_basic)
2824                                         *basic_rates |= BIT(j);
2825                                 if ((rate * 5) < *min_rate) {
2826                                         *min_rate = rate * 5;
2827                                         *min_rate_index = j;
2828                                 }
2829                                 break;
2830                         }
2831                 }
2832         }
2833 }
2834
2835 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2836                                     struct cfg80211_bss *cbss,
2837                                     struct ieee80211_mgmt *mgmt, size_t len)
2838 {
2839         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2840         struct ieee80211_local *local = sdata->local;
2841         struct ieee80211_supported_band *sband;
2842         struct sta_info *sta;
2843         u8 *pos;
2844         u16 capab_info, aid;
2845         struct ieee802_11_elems elems;
2846         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2847         const struct cfg80211_bss_ies *bss_ies = NULL;
2848         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2849         u32 changed = 0;
2850         int err;
2851         bool ret;
2852
2853         /* AssocResp and ReassocResp have identical structure */
2854
2855         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2856         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2857
2858         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2859                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2860                            aid);
2861         aid &= ~(BIT(15) | BIT(14));
2862
2863         ifmgd->broken_ap = false;
2864
2865         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2866                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2867                            aid);
2868                 aid = 0;
2869                 ifmgd->broken_ap = true;
2870         }
2871
2872         pos = mgmt->u.assoc_resp.variable;
2873         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2874
2875         if (!elems.supp_rates) {
2876                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2877                 return false;
2878         }
2879
2880         ifmgd->aid = aid;
2881         ifmgd->tdls_chan_switch_prohibited =
2882                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2883                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2884
2885         /*
2886          * Some APs are erroneously not including some information in their
2887          * (re)association response frames. Try to recover by using the data
2888          * from the beacon or probe response. This seems to afflict mobile
2889          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2890          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2891          */
2892         if ((assoc_data->wmm && !elems.wmm_param) ||
2893             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2894              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2895             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2896              (!elems.vht_cap_elem || !elems.vht_operation))) {
2897                 const struct cfg80211_bss_ies *ies;
2898                 struct ieee802_11_elems bss_elems;
2899
2900                 rcu_read_lock();
2901                 ies = rcu_dereference(cbss->ies);
2902                 if (ies)
2903                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2904                                           GFP_ATOMIC);
2905                 rcu_read_unlock();
2906                 if (!bss_ies)
2907                         return false;
2908
2909                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2910                                        false, &bss_elems);
2911                 if (assoc_data->wmm &&
2912                     !elems.wmm_param && bss_elems.wmm_param) {
2913                         elems.wmm_param = bss_elems.wmm_param;
2914                         sdata_info(sdata,
2915                                    "AP bug: WMM param missing from AssocResp\n");
2916                 }
2917
2918                 /*
2919                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2920                  * have to include the IEs in the (re)association response.
2921                  */
2922                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2923                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2924                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2925                         sdata_info(sdata,
2926                                    "AP bug: HT capability missing from AssocResp\n");
2927                 }
2928                 if (!elems.ht_operation && bss_elems.ht_operation &&
2929                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2930                         elems.ht_operation = bss_elems.ht_operation;
2931                         sdata_info(sdata,
2932                                    "AP bug: HT operation missing from AssocResp\n");
2933                 }
2934                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2935                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2936                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2937                         sdata_info(sdata,
2938                                    "AP bug: VHT capa missing from AssocResp\n");
2939                 }
2940                 if (!elems.vht_operation && bss_elems.vht_operation &&
2941                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2942                         elems.vht_operation = bss_elems.vht_operation;
2943                         sdata_info(sdata,
2944                                    "AP bug: VHT operation missing from AssocResp\n");
2945                 }
2946         }
2947
2948         /*
2949          * We previously checked these in the beacon/probe response, so
2950          * they should be present here. This is just a safety net.
2951          */
2952         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2953             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2954                 sdata_info(sdata,
2955                            "HT AP is missing WMM params or HT capability/operation\n");
2956                 ret = false;
2957                 goto out;
2958         }
2959
2960         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2961             (!elems.vht_cap_elem || !elems.vht_operation)) {
2962                 sdata_info(sdata,
2963                            "VHT AP is missing VHT capability/operation\n");
2964                 ret = false;
2965                 goto out;
2966         }
2967
2968         mutex_lock(&sdata->local->sta_mtx);
2969         /*
2970          * station info was already allocated and inserted before
2971          * the association and should be available to us
2972          */
2973         sta = sta_info_get(sdata, cbss->bssid);
2974         if (WARN_ON(!sta)) {
2975                 mutex_unlock(&sdata->local->sta_mtx);
2976                 ret = false;
2977                 goto out;
2978         }
2979
2980         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2981
2982         /* Set up internal HT/VHT capabilities */
2983         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2984                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2985                                                   elems.ht_cap_elem, sta);
2986
2987         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2988                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2989                                                     elems.vht_cap_elem, sta);
2990
2991         /*
2992          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2993          * in their association response, so ignore that data for our own
2994          * configuration. If it changed since the last beacon, we'll get the
2995          * next beacon and update then.
2996          */
2997
2998         /*
2999          * If an operating mode notification IE is present, override the
3000          * NSS calculation (that would be done in rate_control_rate_init())
3001          * and use the # of streams from that element.
3002          */
3003         if (elems.opmode_notif &&
3004             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3005                 u8 nss;
3006
3007                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3008                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3009                 nss += 1;
3010                 sta->sta.rx_nss = nss;
3011         }
3012
3013         rate_control_rate_init(sta);
3014
3015         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3016                 set_sta_flag(sta, WLAN_STA_MFP);
3017                 sta->sta.mfp = true;
3018         } else {
3019                 sta->sta.mfp = false;
3020         }
3021
3022         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3023
3024         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3025         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3026                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3027         if (err) {
3028                 sdata_info(sdata,
3029                            "failed to move station %pM to desired state\n",
3030                            sta->sta.addr);
3031                 WARN_ON(__sta_info_destroy(sta));
3032                 mutex_unlock(&sdata->local->sta_mtx);
3033                 ret = false;
3034                 goto out;
3035         }
3036
3037         mutex_unlock(&sdata->local->sta_mtx);
3038
3039         /*
3040          * Always handle WMM once after association regardless
3041          * of the first value the AP uses. Setting -1 here has
3042          * that effect because the AP values is an unsigned
3043          * 4-bit value.
3044          */
3045         ifmgd->wmm_last_param_set = -1;
3046
3047         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3048                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3049                                          elems.wmm_param_len);
3050         else
3051                 ieee80211_set_wmm_default(sdata, false);
3052         changed |= BSS_CHANGED_QOS;
3053
3054         /* set AID and assoc capability,
3055          * ieee80211_set_associated() will tell the driver */
3056         bss_conf->aid = aid;
3057         bss_conf->assoc_capability = capab_info;
3058         ieee80211_set_associated(sdata, cbss, changed);
3059
3060         /*
3061          * If we're using 4-addr mode, let the AP know that we're
3062          * doing so, so that it can create the STA VLAN on its side
3063          */
3064         if (ifmgd->use_4addr)
3065                 ieee80211_send_4addr_nullfunc(local, sdata);
3066
3067         /*
3068          * Start timer to probe the connection to the AP now.
3069          * Also start the timer that will detect beacon loss.
3070          */
3071         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3072         ieee80211_sta_reset_beacon_monitor(sdata);
3073
3074         ret = true;
3075  out:
3076         kfree(bss_ies);
3077         return ret;
3078 }
3079
3080 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3081                                          struct ieee80211_mgmt *mgmt,
3082                                          size_t len)
3083 {
3084         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3085         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3086         u16 capab_info, status_code, aid;
3087         struct ieee802_11_elems elems;
3088         int ac, uapsd_queues = -1;
3089         u8 *pos;
3090         bool reassoc;
3091         struct cfg80211_bss *bss;
3092         struct ieee80211_event event = {
3093                 .type = MLME_EVENT,
3094                 .u.mlme.data = ASSOC_EVENT,
3095         };
3096
3097         sdata_assert_lock(sdata);
3098
3099         if (!assoc_data)
3100                 return;
3101         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3102                 return;
3103
3104         /*
3105          * AssocResp and ReassocResp have identical structure, so process both
3106          * of them in this function.
3107          */
3108
3109         if (len < 24 + 6)
3110                 return;
3111
3112         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3113         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3114         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3115         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3116
3117         sdata_info(sdata,
3118                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3119                    reassoc ? "Rea" : "A", mgmt->sa,
3120                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3121
3122         pos = mgmt->u.assoc_resp.variable;
3123         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3124
3125         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3126             elems.timeout_int &&
3127             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3128                 u32 tu, ms;
3129                 tu = le32_to_cpu(elems.timeout_int->value);
3130                 ms = tu * 1024 / 1000;
3131                 sdata_info(sdata,
3132                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3133                            mgmt->sa, tu, ms);
3134                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3135                 assoc_data->timeout_started = true;
3136                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3137                         run_again(sdata, assoc_data->timeout);
3138                 return;
3139         }
3140
3141         bss = assoc_data->bss;
3142
3143         if (status_code != WLAN_STATUS_SUCCESS) {
3144                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3145                            mgmt->sa, status_code);
3146                 ieee80211_destroy_assoc_data(sdata, false);
3147                 event.u.mlme.status = MLME_DENIED;
3148                 event.u.mlme.reason = status_code;
3149                 drv_event_callback(sdata->local, sdata, &event);
3150         } else {
3151                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3152                         /* oops -- internal error -- send timeout for now */
3153                         ieee80211_destroy_assoc_data(sdata, false);
3154                         cfg80211_assoc_timeout(sdata->dev, bss);
3155                         return;
3156                 }
3157                 event.u.mlme.status = MLME_SUCCESS;
3158                 drv_event_callback(sdata->local, sdata, &event);
3159                 sdata_info(sdata, "associated\n");
3160
3161                 /*
3162                  * destroy assoc_data afterwards, as otherwise an idle
3163                  * recalc after assoc_data is NULL but before associated
3164                  * is set can cause the interface to go idle
3165                  */
3166                 ieee80211_destroy_assoc_data(sdata, true);
3167
3168                 /* get uapsd queues configuration */
3169                 uapsd_queues = 0;
3170                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3171                         if (sdata->tx_conf[ac].uapsd)
3172                                 uapsd_queues |= BIT(ac);
3173         }
3174
3175         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3176 }
3177
3178 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3179                                   struct ieee80211_mgmt *mgmt, size_t len,
3180                                   struct ieee80211_rx_status *rx_status,
3181                                   struct ieee802_11_elems *elems)
3182 {
3183         struct ieee80211_local *local = sdata->local;
3184         struct ieee80211_bss *bss;
3185         struct ieee80211_channel *channel;
3186
3187         sdata_assert_lock(sdata);
3188
3189         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3190         if (!channel)
3191                 return;
3192
3193         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3194                                         channel);
3195         if (bss) {
3196                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3197                 ieee80211_rx_bss_put(local, bss);
3198         }
3199 }
3200
3201
3202 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3203                                          struct sk_buff *skb)
3204 {
3205         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3206         struct ieee80211_if_managed *ifmgd;
3207         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3208         size_t baselen, len = skb->len;
3209         struct ieee802_11_elems elems;
3210
3211         ifmgd = &sdata->u.mgd;
3212
3213         sdata_assert_lock(sdata);
3214
3215         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3216                 return; /* ignore ProbeResp to foreign address */
3217
3218         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3219         if (baselen > len)
3220                 return;
3221
3222         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3223                                false, &elems);
3224
3225         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3226
3227         if (ifmgd->associated &&
3228             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3229                 ieee80211_reset_ap_probe(sdata);
3230 }
3231
3232 /*
3233  * This is the canonical list of information elements we care about,
3234  * the filter code also gives us all changes to the Microsoft OUI
3235  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3236  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3237  * changes to requested client power.
3238  *
3239  * We implement beacon filtering in software since that means we can
3240  * avoid processing the frame here and in cfg80211, and userspace
3241  * will not be able to tell whether the hardware supports it or not.
3242  *
3243  * XXX: This list needs to be dynamic -- userspace needs to be able to
3244  *      add items it requires. It also needs to be able to tell us to
3245  *      look out for other vendor IEs.
3246  */
3247 static const u64 care_about_ies =
3248         (1ULL << WLAN_EID_COUNTRY) |
3249         (1ULL << WLAN_EID_ERP_INFO) |
3250         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3251         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3252         (1ULL << WLAN_EID_HT_CAPABILITY) |
3253         (1ULL << WLAN_EID_HT_OPERATION) |
3254         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3255
3256 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3257                                      struct ieee80211_mgmt *mgmt, size_t len,
3258                                      struct ieee80211_rx_status *rx_status)
3259 {
3260         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3261         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3262         size_t baselen;
3263         struct ieee802_11_elems elems;
3264         struct ieee80211_local *local = sdata->local;
3265         struct ieee80211_chanctx_conf *chanctx_conf;
3266         struct ieee80211_channel *chan;
3267         struct sta_info *sta;
3268         u32 changed = 0;
3269         bool erp_valid;
3270         u8 erp_value = 0;
3271         u32 ncrc;
3272         u8 *bssid;
3273         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3274
3275         sdata_assert_lock(sdata);
3276
3277         /* Process beacon from the current BSS */
3278         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3279         if (baselen > len)
3280                 return;
3281
3282         rcu_read_lock();
3283         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3284         if (!chanctx_conf) {
3285                 rcu_read_unlock();
3286                 return;
3287         }
3288
3289         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3290                 rcu_read_unlock();
3291                 return;
3292         }
3293         chan = chanctx_conf->def.chan;
3294         rcu_read_unlock();
3295
3296         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3297             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3298                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3299                                        len - baselen, false, &elems);
3300
3301                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3302                 if (elems.tim && !elems.parse_error) {
3303                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3304                         ifmgd->dtim_period = tim_ie->dtim_period;
3305                 }
3306                 ifmgd->have_beacon = true;
3307                 ifmgd->assoc_data->need_beacon = false;
3308                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3309                         sdata->vif.bss_conf.sync_tsf =
3310                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3311                         sdata->vif.bss_conf.sync_device_ts =
3312                                 rx_status->device_timestamp;
3313                         if (elems.tim)
3314                                 sdata->vif.bss_conf.sync_dtim_count =
3315                                         elems.tim->dtim_count;
3316                         else
3317                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3318                 }
3319                 /* continue assoc process */
3320                 ifmgd->assoc_data->timeout = jiffies;
3321                 ifmgd->assoc_data->timeout_started = true;
3322                 run_again(sdata, ifmgd->assoc_data->timeout);
3323                 return;
3324         }
3325
3326         if (!ifmgd->associated ||
3327             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3328                 return;
3329         bssid = ifmgd->associated->bssid;
3330
3331         /* Track average RSSI from the Beacon frames of the current AP */
3332         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3333                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3334                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3335                 ifmgd->last_cqm_event_signal = 0;
3336                 ifmgd->count_beacon_signal = 1;
3337                 ifmgd->last_ave_beacon_signal = 0;
3338         } else {
3339                 ifmgd->count_beacon_signal++;
3340         }
3341
3342         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3343
3344         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3345             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3346                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3347                 int last_sig = ifmgd->last_ave_beacon_signal;
3348                 struct ieee80211_event event = {
3349                         .type = RSSI_EVENT,
3350                 };
3351
3352                 /*
3353                  * if signal crosses either of the boundaries, invoke callback
3354                  * with appropriate parameters
3355                  */
3356                 if (sig > ifmgd->rssi_max_thold &&
3357                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3358                         ifmgd->last_ave_beacon_signal = sig;
3359                         event.u.rssi.data = RSSI_EVENT_HIGH;
3360                         drv_event_callback(local, sdata, &event);
3361                 } else if (sig < ifmgd->rssi_min_thold &&
3362                            (last_sig >= ifmgd->rssi_max_thold ||
3363                            last_sig == 0)) {
3364                         ifmgd->last_ave_beacon_signal = sig;
3365                         event.u.rssi.data = RSSI_EVENT_LOW;
3366                         drv_event_callback(local, sdata, &event);
3367                 }
3368         }
3369
3370         if (bss_conf->cqm_rssi_thold &&
3371             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3372             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3373                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3374                 int last_event = ifmgd->last_cqm_event_signal;
3375                 int thold = bss_conf->cqm_rssi_thold;
3376                 int hyst = bss_conf->cqm_rssi_hyst;
3377
3378                 if (sig < thold &&
3379                     (last_event == 0 || sig < last_event - hyst)) {
3380                         ifmgd->last_cqm_event_signal = sig;
3381                         ieee80211_cqm_rssi_notify(
3382                                 &sdata->vif,
3383                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3384                                 GFP_KERNEL);
3385                 } else if (sig > thold &&
3386                            (last_event == 0 || sig > last_event + hyst)) {
3387                         ifmgd->last_cqm_event_signal = sig;
3388                         ieee80211_cqm_rssi_notify(
3389                                 &sdata->vif,
3390                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3391                                 GFP_KERNEL);
3392                 }
3393         }
3394
3395         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3396                 mlme_dbg_ratelimited(sdata,
3397                                      "cancelling AP probe due to a received beacon\n");
3398                 ieee80211_reset_ap_probe(sdata);
3399         }
3400
3401         /*
3402          * Push the beacon loss detection into the future since
3403          * we are processing a beacon from the AP just now.
3404          */
3405         ieee80211_sta_reset_beacon_monitor(sdata);
3406
3407         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3408         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3409                                           len - baselen, false, &elems,
3410                                           care_about_ies, ncrc);
3411
3412         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3413             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3414                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3415                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3416                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3417                                 ieee80211_hw_config(local,
3418                                                     IEEE80211_CONF_CHANGE_PS);
3419                         }
3420                         ieee80211_send_nullfunc(local, sdata, false);
3421                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3422                         local->pspolling = true;
3423
3424                         /*
3425                          * Here is assumed that the driver will be
3426                          * able to send ps-poll frame and receive a
3427                          * response even though power save mode is
3428                          * enabled, but some drivers might require
3429                          * to disable power save here. This needs
3430                          * to be investigated.
3431                          */
3432                         ieee80211_send_pspoll(local, sdata);
3433                 }
3434         }
3435
3436         if (sdata->vif.p2p) {
3437                 struct ieee80211_p2p_noa_attr noa = {};
3438                 int ret;
3439
3440                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3441                                             len - baselen,
3442                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3443                                             (u8 *) &noa, sizeof(noa));
3444                 if (ret >= 2) {
3445                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3446                                 /* valid noa_attr and index changed */
3447                                 sdata->u.mgd.p2p_noa_index = noa.index;
3448                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3449                                 changed |= BSS_CHANGED_P2P_PS;
3450                                 /*
3451                                  * make sure we update all information, the CRC
3452                                  * mechanism doesn't look at P2P attributes.
3453                                  */
3454                                 ifmgd->beacon_crc_valid = false;
3455                         }
3456                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3457                         /* noa_attr not found and we had valid noa_attr before */
3458                         sdata->u.mgd.p2p_noa_index = -1;
3459                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3460                         changed |= BSS_CHANGED_P2P_PS;
3461                         ifmgd->beacon_crc_valid = false;
3462                 }
3463         }
3464
3465         if (ifmgd->csa_waiting_bcn)
3466                 ieee80211_chswitch_post_beacon(sdata);
3467
3468         /*
3469          * Update beacon timing and dtim count on every beacon appearance. This
3470          * will allow the driver to use the most updated values. Do it before
3471          * comparing this one with last received beacon.
3472          * IMPORTANT: These parameters would possibly be out of sync by the time
3473          * the driver will use them. The synchronized view is currently
3474          * guaranteed only in certain callbacks.
3475          */
3476         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3477                 sdata->vif.bss_conf.sync_tsf =
3478                         le64_to_cpu(mgmt->u.beacon.timestamp);
3479                 sdata->vif.bss_conf.sync_device_ts =
3480                         rx_status->device_timestamp;
3481                 if (elems.tim)
3482                         sdata->vif.bss_conf.sync_dtim_count =
3483                                 elems.tim->dtim_count;
3484                 else
3485                         sdata->vif.bss_conf.sync_dtim_count = 0;
3486         }
3487
3488         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3489                 return;
3490         ifmgd->beacon_crc = ncrc;
3491         ifmgd->beacon_crc_valid = true;
3492
3493         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3494
3495         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3496                                          rx_status->device_timestamp,
3497                                          &elems, true);
3498
3499         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3500             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3501                                      elems.wmm_param_len))
3502                 changed |= BSS_CHANGED_QOS;
3503
3504         /*
3505          * If we haven't had a beacon before, tell the driver about the
3506          * DTIM period (and beacon timing if desired) now.
3507          */
3508         if (!ifmgd->have_beacon) {
3509                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3510                 if (elems.tim)
3511                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3512                 else
3513                         bss_conf->dtim_period = 1;
3514
3515                 changed |= BSS_CHANGED_BEACON_INFO;
3516                 ifmgd->have_beacon = true;
3517
3518                 mutex_lock(&local->iflist_mtx);
3519                 ieee80211_recalc_ps(local);
3520                 mutex_unlock(&local->iflist_mtx);
3521
3522                 ieee80211_recalc_ps_vif(sdata);
3523         }
3524
3525         if (elems.erp_info) {
3526                 erp_valid = true;
3527                 erp_value = elems.erp_info[0];
3528         } else {
3529                 erp_valid = false;
3530         }
3531         changed |= ieee80211_handle_bss_capability(sdata,
3532                         le16_to_cpu(mgmt->u.beacon.capab_info),
3533                         erp_valid, erp_value);
3534
3535         mutex_lock(&local->sta_mtx);
3536         sta = sta_info_get(sdata, bssid);
3537
3538         if (ieee80211_config_bw(sdata, sta,
3539                                 elems.ht_cap_elem, elems.ht_operation,
3540                                 elems.vht_operation, bssid, &changed)) {
3541                 mutex_unlock(&local->sta_mtx);
3542                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3543                                        WLAN_REASON_DEAUTH_LEAVING,
3544                                        true, deauth_buf);
3545                 ieee80211_report_disconnect(sdata, deauth_buf,
3546                                             sizeof(deauth_buf), true,
3547                                             WLAN_REASON_DEAUTH_LEAVING);
3548                 return;
3549         }
3550
3551         if (sta && elems.opmode_notif)
3552                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3553                                             rx_status->band, true);
3554         mutex_unlock(&local->sta_mtx);
3555
3556         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3557                                                elems.country_elem,
3558                                                elems.country_elem_len,
3559                                                elems.pwr_constr_elem,
3560                                                elems.cisco_dtpc_elem);
3561
3562         ieee80211_bss_info_change_notify(sdata, changed);
3563 }
3564
3565 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3566                                   struct sk_buff *skb)
3567 {
3568         struct ieee80211_rx_status *rx_status;
3569         struct ieee80211_mgmt *mgmt;
3570         u16 fc;
3571         struct ieee802_11_elems elems;
3572         int ies_len;
3573
3574         rx_status = (struct ieee80211_rx_status *) skb->cb;
3575         mgmt = (struct ieee80211_mgmt *) skb->data;
3576         fc = le16_to_cpu(mgmt->frame_control);
3577
3578         sdata_lock(sdata);
3579
3580         switch (fc & IEEE80211_FCTL_STYPE) {
3581         case IEEE80211_STYPE_BEACON:
3582                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3583                 break;
3584         case IEEE80211_STYPE_PROBE_RESP:
3585                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3586                 break;
3587         case IEEE80211_STYPE_AUTH:
3588                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3589                 break;
3590         case IEEE80211_STYPE_DEAUTH:
3591                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3592                 break;
3593         case IEEE80211_STYPE_DISASSOC:
3594                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3595                 break;
3596         case IEEE80211_STYPE_ASSOC_RESP:
3597         case IEEE80211_STYPE_REASSOC_RESP:
3598                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3599                 break;
3600         case IEEE80211_STYPE_ACTION:
3601                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3602                         ies_len = skb->len -
3603                                   offsetof(struct ieee80211_mgmt,
3604                                            u.action.u.chan_switch.variable);
3605
3606                         if (ies_len < 0)
3607                                 break;
3608
3609                         ieee802_11_parse_elems(
3610                                 mgmt->u.action.u.chan_switch.variable,
3611                                 ies_len, true, &elems);
3612
3613                         if (elems.parse_error)
3614                                 break;
3615
3616                         ieee80211_sta_process_chanswitch(sdata,
3617                                                  rx_status->mactime,
3618                                                  rx_status->device_timestamp,
3619                                                  &elems, false);
3620                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3621                         ies_len = skb->len -
3622                                   offsetof(struct ieee80211_mgmt,
3623                                            u.action.u.ext_chan_switch.variable);
3624
3625                         if (ies_len < 0)
3626                                 break;
3627
3628                         ieee802_11_parse_elems(
3629                                 mgmt->u.action.u.ext_chan_switch.variable,
3630                                 ies_len, true, &elems);
3631
3632                         if (elems.parse_error)
3633                                 break;
3634
3635                         /* for the handling code pretend this was also an IE */
3636                         elems.ext_chansw_ie =
3637                                 &mgmt->u.action.u.ext_chan_switch.data;
3638
3639                         ieee80211_sta_process_chanswitch(sdata,
3640                                                  rx_status->mactime,
3641                                                  rx_status->device_timestamp,
3642                                                  &elems, false);
3643                 }
3644                 break;
3645         }
3646         sdata_unlock(sdata);
3647 }
3648
3649 static void ieee80211_sta_timer(unsigned long data)
3650 {
3651         struct ieee80211_sub_if_data *sdata =
3652                 (struct ieee80211_sub_if_data *) data;
3653
3654         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3655 }
3656
3657 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3658                                           u8 *bssid, u8 reason, bool tx)
3659 {
3660         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3661
3662         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3663                                tx, frame_buf);
3664
3665         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3666                                     reason);
3667 }
3668
3669 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3670 {
3671         struct ieee80211_local *local = sdata->local;
3672         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3673         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3674         u32 tx_flags = 0;
3675         u16 trans = 1;
3676         u16 status = 0;
3677
3678         sdata_assert_lock(sdata);
3679
3680         if (WARN_ON_ONCE(!auth_data))
3681                 return -EINVAL;
3682
3683         auth_data->tries++;
3684
3685         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3686                 sdata_info(sdata, "authentication with %pM timed out\n",
3687                            auth_data->bss->bssid);
3688
3689                 /*
3690                  * Most likely AP is not in the range so remove the
3691                  * bss struct for that AP.
3692                  */
3693                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3694
3695                 return -ETIMEDOUT;
3696         }
3697
3698         drv_mgd_prepare_tx(local, sdata);
3699
3700         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3701                    auth_data->bss->bssid, auth_data->tries,
3702                    IEEE80211_AUTH_MAX_TRIES);
3703
3704         auth_data->expected_transaction = 2;
3705
3706         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3707                 trans = auth_data->sae_trans;
3708                 status = auth_data->sae_status;
3709                 auth_data->expected_transaction = trans;
3710         }
3711
3712         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3713                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3714                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3715
3716         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3717                             auth_data->data, auth_data->data_len,
3718                             auth_data->bss->bssid,
3719                             auth_data->bss->bssid, NULL, 0, 0,
3720                             tx_flags);
3721
3722         if (tx_flags == 0) {
3723                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3724                 auth_data->timeout_started = true;
3725                 run_again(sdata, auth_data->timeout);
3726         } else {
3727                 auth_data->timeout =
3728                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3729                 auth_data->timeout_started = true;
3730                 run_again(sdata, auth_data->timeout);
3731         }
3732
3733         return 0;
3734 }
3735
3736 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3737 {
3738         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3739         struct ieee80211_local *local = sdata->local;
3740
3741         sdata_assert_lock(sdata);
3742
3743         assoc_data->tries++;
3744         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3745                 sdata_info(sdata, "association with %pM timed out\n",
3746                            assoc_data->bss->bssid);
3747
3748                 /*
3749                  * Most likely AP is not in the range so remove the
3750                  * bss struct for that AP.
3751                  */
3752                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3753
3754                 return -ETIMEDOUT;
3755         }
3756
3757         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3758                    assoc_data->bss->bssid, assoc_data->tries,
3759                    IEEE80211_ASSOC_MAX_TRIES);
3760         ieee80211_send_assoc(sdata);
3761
3762         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3763                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3764                 assoc_data->timeout_started = true;
3765                 run_again(sdata, assoc_data->timeout);
3766         } else {
3767                 assoc_data->timeout =
3768                         round_jiffies_up(jiffies +
3769                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3770                 assoc_data->timeout_started = true;
3771                 run_again(sdata, assoc_data->timeout);
3772         }
3773
3774         return 0;
3775 }
3776
3777 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3778                                   __le16 fc, bool acked)
3779 {
3780         struct ieee80211_local *local = sdata->local;
3781
3782         sdata->u.mgd.status_fc = fc;
3783         sdata->u.mgd.status_acked = acked;
3784         sdata->u.mgd.status_received = true;
3785
3786         ieee80211_queue_work(&local->hw, &sdata->work);
3787 }
3788
3789 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3790 {
3791         struct ieee80211_local *local = sdata->local;
3792         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3793
3794         sdata_lock(sdata);
3795
3796         if (ifmgd->status_received) {
3797                 __le16 fc = ifmgd->status_fc;
3798                 bool status_acked = ifmgd->status_acked;
3799
3800                 ifmgd->status_received = false;
3801                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3802                         if (status_acked) {
3803                                 ifmgd->auth_data->timeout =
3804                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3805                                 run_again(sdata, ifmgd->auth_data->timeout);
3806                         } else {
3807                                 ifmgd->auth_data->timeout = jiffies - 1;
3808                         }
3809                         ifmgd->auth_data->timeout_started = true;
3810                 } else if (ifmgd->assoc_data &&
3811                            (ieee80211_is_assoc_req(fc) ||
3812                             ieee80211_is_reassoc_req(fc))) {
3813                         if (status_acked) {
3814                                 ifmgd->assoc_data->timeout =
3815                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3816                                 run_again(sdata, ifmgd->assoc_data->timeout);
3817                         } else {
3818                                 ifmgd->assoc_data->timeout = jiffies - 1;
3819                         }
3820                         ifmgd->assoc_data->timeout_started = true;
3821                 }
3822         }
3823
3824         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3825             time_after(jiffies, ifmgd->auth_data->timeout)) {
3826                 if (ifmgd->auth_data->done) {
3827                         /*
3828                          * ok ... we waited for assoc but userspace didn't,
3829                          * so let's just kill the auth data
3830                          */
3831                         ieee80211_destroy_auth_data(sdata, false);
3832                 } else if (ieee80211_auth(sdata)) {
3833                         u8 bssid[ETH_ALEN];
3834                         struct ieee80211_event event = {
3835                                 .type = MLME_EVENT,
3836                                 .u.mlme.data = AUTH_EVENT,
3837                                 .u.mlme.status = MLME_TIMEOUT,
3838                         };
3839
3840                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3841
3842                         ieee80211_destroy_auth_data(sdata, false);
3843
3844                         cfg80211_auth_timeout(sdata->dev, bssid);
3845                         drv_event_callback(sdata->local, sdata, &event);
3846                 }
3847         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3848                 run_again(sdata, ifmgd->auth_data->timeout);
3849
3850         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3851             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3852                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3853                     ieee80211_do_assoc(sdata)) {
3854                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3855                         struct ieee80211_event event = {
3856                                 .type = MLME_EVENT,
3857                                 .u.mlme.data = ASSOC_EVENT,
3858                                 .u.mlme.status = MLME_TIMEOUT,
3859                         };
3860
3861                         ieee80211_destroy_assoc_data(sdata, false);
3862                         cfg80211_assoc_timeout(sdata->dev, bss);
3863                         drv_event_callback(sdata->local, sdata, &event);
3864                 }
3865         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3866                 run_again(sdata, ifmgd->assoc_data->timeout);
3867
3868         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3869             ifmgd->associated) {
3870                 u8 bssid[ETH_ALEN];
3871                 int max_tries;
3872
3873                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3874
3875                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3876                         max_tries = max_nullfunc_tries;
3877                 else
3878                         max_tries = max_probe_tries;
3879
3880                 /* ACK received for nullfunc probing frame */
3881                 if (!ifmgd->probe_send_count)
3882                         ieee80211_reset_ap_probe(sdata);
3883                 else if (ifmgd->nullfunc_failed) {
3884                         if (ifmgd->probe_send_count < max_tries) {
3885                                 mlme_dbg(sdata,
3886                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3887                                          bssid, ifmgd->probe_send_count,
3888                                          max_tries);
3889                                 ieee80211_mgd_probe_ap_send(sdata);
3890                         } else {
3891                                 mlme_dbg(sdata,
3892                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3893                                          bssid);
3894                                 ieee80211_sta_connection_lost(sdata, bssid,
3895                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3896                                         false);
3897                         }
3898                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3899                         run_again(sdata, ifmgd->probe_timeout);
3900                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3901                         mlme_dbg(sdata,
3902                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3903                                  bssid, probe_wait_ms);
3904                         ieee80211_sta_connection_lost(sdata, bssid,
3905                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3906                 } else if (ifmgd->probe_send_count < max_tries) {
3907                         mlme_dbg(sdata,
3908                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3909                                  bssid, probe_wait_ms,
3910                                  ifmgd->probe_send_count, max_tries);
3911                         ieee80211_mgd_probe_ap_send(sdata);
3912                 } else {
3913                         /*
3914                          * We actually lost the connection ... or did we?
3915                          * Let's make sure!
3916                          */
3917                         wiphy_debug(local->hw.wiphy,
3918                                     "%s: No probe response from AP %pM"
3919                                     " after %dms, disconnecting.\n",
3920                                     sdata->name,
3921                                     bssid, probe_wait_ms);
3922
3923                         ieee80211_sta_connection_lost(sdata, bssid,
3924                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3925                 }
3926         }
3927
3928         sdata_unlock(sdata);
3929 }
3930
3931 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3932 {
3933         struct ieee80211_sub_if_data *sdata =
3934                 (struct ieee80211_sub_if_data *) data;
3935         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3936
3937         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3938                 return;
3939
3940         sdata->u.mgd.connection_loss = false;
3941         ieee80211_queue_work(&sdata->local->hw,
3942                              &sdata->u.mgd.beacon_connection_loss_work);
3943 }
3944
3945 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3946 {
3947         struct ieee80211_sub_if_data *sdata =
3948                 (struct ieee80211_sub_if_data *) data;
3949         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3950         struct ieee80211_local *local = sdata->local;
3951
3952         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3953                 return;
3954
3955         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3956 }
3957
3958 static void ieee80211_sta_monitor_work(struct work_struct *work)
3959 {
3960         struct ieee80211_sub_if_data *sdata =
3961                 container_of(work, struct ieee80211_sub_if_data,
3962                              u.mgd.monitor_work);
3963
3964         ieee80211_mgd_probe_ap(sdata, false);
3965 }
3966
3967 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3968 {
3969         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3970                 __ieee80211_stop_poll(sdata);
3971
3972                 /* let's probe the connection once */
3973                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
3974                         ieee80211_queue_work(&sdata->local->hw,
3975                                              &sdata->u.mgd.monitor_work);
3976                 /* and do all the other regular work too */
3977                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3978         }
3979 }
3980
3981 #ifdef CONFIG_PM
3982 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3983 {
3984         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3985         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3986
3987         sdata_lock(sdata);
3988
3989         if (ifmgd->auth_data || ifmgd->assoc_data) {
3990                 const u8 *bssid = ifmgd->auth_data ?
3991                                 ifmgd->auth_data->bss->bssid :
3992                                 ifmgd->assoc_data->bss->bssid;
3993
3994                 /*
3995                  * If we are trying to authenticate / associate while suspending,
3996                  * cfg80211 won't know and won't actually abort those attempts,
3997                  * thus we need to do that ourselves.
3998                  */
3999                 ieee80211_send_deauth_disassoc(sdata, bssid,
4000                                                IEEE80211_STYPE_DEAUTH,
4001                                                WLAN_REASON_DEAUTH_LEAVING,
4002                                                false, frame_buf);
4003                 if (ifmgd->assoc_data)
4004                         ieee80211_destroy_assoc_data(sdata, false);
4005                 if (ifmgd->auth_data)
4006                         ieee80211_destroy_auth_data(sdata, false);
4007                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4008                                       IEEE80211_DEAUTH_FRAME_LEN);
4009         }
4010
4011         /* This is a bit of a hack - we should find a better and more generic
4012          * solution to this. Normally when suspending, cfg80211 will in fact
4013          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4014          * auth (not so important) or assoc (this is the problem) process.
4015          *
4016          * As a consequence, it can happen that we are in the process of both
4017          * associating and suspending, and receive an association response
4018          * after cfg80211 has checked if it needs to disconnect, but before
4019          * we actually set the flag to drop incoming frames. This will then
4020          * cause the workqueue flush to process the association response in
4021          * the suspend, resulting in a successful association just before it
4022          * tries to remove the interface from the driver, which now though
4023          * has a channel context assigned ... this results in issues.
4024          *
4025          * To work around this (for now) simply deauth here again if we're
4026          * now connected.
4027          */
4028         if (ifmgd->associated && !sdata->local->wowlan) {
4029                 u8 bssid[ETH_ALEN];
4030                 struct cfg80211_deauth_request req = {
4031                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4032                         .bssid = bssid,
4033                 };
4034
4035                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4036                 ieee80211_mgd_deauth(sdata, &req);
4037         }
4038
4039         sdata_unlock(sdata);
4040 }
4041
4042 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4043 {
4044         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4045
4046         sdata_lock(sdata);
4047         if (!ifmgd->associated) {
4048                 sdata_unlock(sdata);
4049                 return;
4050         }
4051
4052         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4053                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4054                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4055                 ieee80211_sta_connection_lost(sdata,
4056                                               ifmgd->associated->bssid,
4057                                               WLAN_REASON_UNSPECIFIED,
4058                                               true);
4059                 sdata_unlock(sdata);
4060                 return;
4061         }
4062         sdata_unlock(sdata);
4063 }
4064 #endif
4065
4066 /* interface setup */
4067 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4068 {
4069         struct ieee80211_if_managed *ifmgd;
4070
4071         ifmgd = &sdata->u.mgd;
4072         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4073         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4074         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4075                   ieee80211_beacon_connection_loss_work);
4076         INIT_WORK(&ifmgd->csa_connection_drop_work,
4077                   ieee80211_csa_connection_drop_work);
4078         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4079         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4080                           ieee80211_tdls_peer_del_work);
4081         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4082                     (unsigned long) sdata);
4083         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4084                     (unsigned long) sdata);
4085         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4086                     (unsigned long) sdata);
4087         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4088                     (unsigned long) sdata);
4089         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4090                           ieee80211_sta_handle_tspec_ac_params_wk);
4091
4092         ifmgd->flags = 0;
4093         ifmgd->powersave = sdata->wdev.ps;
4094         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4095         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4096         ifmgd->p2p_noa_index = -1;
4097
4098         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4099                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4100         else
4101                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4102
4103         /* Setup TDLS data */
4104         spin_lock_init(&ifmgd->teardown_lock);
4105         ifmgd->teardown_skb = NULL;
4106         ifmgd->orig_teardown_skb = NULL;
4107 }
4108
4109 /* scan finished notification */
4110 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4111 {
4112         struct ieee80211_sub_if_data *sdata;
4113
4114         /* Restart STA timers */
4115         rcu_read_lock();
4116         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4117                 if (ieee80211_sdata_running(sdata))
4118                         ieee80211_restart_sta_timer(sdata);
4119         }
4120         rcu_read_unlock();
4121 }
4122
4123 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4124                                      struct cfg80211_bss *cbss)
4125 {
4126         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4127         const u8 *ht_cap_ie, *vht_cap_ie;
4128         const struct ieee80211_ht_cap *ht_cap;
4129         const struct ieee80211_vht_cap *vht_cap;
4130         u8 chains = 1;
4131
4132         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4133                 return chains;
4134
4135         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4136         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4137                 ht_cap = (void *)(ht_cap_ie + 2);
4138                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4139                 /*
4140                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4141                  *       "Tx Unequal Modulation Supported" fields.
4142                  */
4143         }
4144
4145         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4146                 return chains;
4147
4148         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4149         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4150                 u8 nss;
4151                 u16 tx_mcs_map;
4152
4153                 vht_cap = (void *)(vht_cap_ie + 2);
4154                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4155                 for (nss = 8; nss > 0; nss--) {
4156                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4157                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4158                                 break;
4159                 }
4160                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4161                 chains = max(chains, nss);
4162         }
4163
4164         return chains;
4165 }
4166
4167 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4168                                   struct cfg80211_bss *cbss)
4169 {
4170         struct ieee80211_local *local = sdata->local;
4171         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4172         const struct ieee80211_ht_cap *ht_cap = NULL;
4173         const struct ieee80211_ht_operation *ht_oper = NULL;
4174         const struct ieee80211_vht_operation *vht_oper = NULL;
4175         struct ieee80211_supported_band *sband;
4176         struct cfg80211_chan_def chandef;
4177         int ret;
4178         u32 i;
4179         bool have_80mhz;
4180
4181         sband = local->hw.wiphy->bands[cbss->channel->band];
4182
4183         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4184                           IEEE80211_STA_DISABLE_80P80MHZ |
4185                           IEEE80211_STA_DISABLE_160MHZ);
4186
4187         rcu_read_lock();
4188
4189         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4190             sband->ht_cap.ht_supported) {
4191                 const u8 *ht_oper_ie, *ht_cap_ie;
4192
4193                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4194                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4195                         ht_oper = (void *)(ht_oper_ie + 2);
4196
4197                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4198                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4199                         ht_cap = (void *)(ht_cap_ie + 2);
4200
4201                 if (!ht_cap) {
4202                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4203                         ht_oper = NULL;
4204                 }
4205         }
4206
4207         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4208             sband->vht_cap.vht_supported) {
4209                 const u8 *vht_oper_ie, *vht_cap;
4210
4211                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4212                                                    WLAN_EID_VHT_OPERATION);
4213                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4214                         vht_oper = (void *)(vht_oper_ie + 2);
4215                 if (vht_oper && !ht_oper) {
4216                         vht_oper = NULL;
4217                         sdata_info(sdata,
4218                                    "AP advertised VHT without HT, disabling both\n");
4219                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4220                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4221                 }
4222
4223                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4224                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4225                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4226                         vht_oper = NULL;
4227                 }
4228         }
4229
4230         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4231         have_80mhz = false;
4232         for (i = 0; i < sband->n_channels; i++) {
4233                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4234                                                 IEEE80211_CHAN_NO_80MHZ))
4235                         continue;
4236
4237                 have_80mhz = true;
4238                 break;
4239         }
4240
4241         if (!have_80mhz)
4242                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4243
4244         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4245                                                      cbss->channel,
4246                                                      ht_cap, ht_oper, vht_oper,
4247                                                      &chandef, false);
4248
4249         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4250                                       local->rx_chains);
4251
4252         rcu_read_unlock();
4253
4254         /* will change later if needed */
4255         sdata->smps_mode = IEEE80211_SMPS_OFF;
4256
4257         mutex_lock(&local->mtx);
4258         /*
4259          * If this fails (possibly due to channel context sharing
4260          * on incompatible channels, e.g. 80+80 and 160 sharing the
4261          * same control channel) try to use a smaller bandwidth.
4262          */
4263         ret = ieee80211_vif_use_channel(sdata, &chandef,
4264                                         IEEE80211_CHANCTX_SHARED);
4265
4266         /* don't downgrade for 5 and 10 MHz channels, though. */
4267         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4268             chandef.width == NL80211_CHAN_WIDTH_10)
4269                 goto out;
4270
4271         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4272                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4273                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4274                                                 IEEE80211_CHANCTX_SHARED);
4275         }
4276  out:
4277         mutex_unlock(&local->mtx);
4278         return ret;
4279 }
4280
4281 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4282                                      struct cfg80211_bss *cbss, bool assoc,
4283                                      bool override)
4284 {
4285         struct ieee80211_local *local = sdata->local;
4286         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4287         struct ieee80211_bss *bss = (void *)cbss->priv;
4288         struct sta_info *new_sta = NULL;
4289         struct ieee80211_supported_band *sband;
4290         bool have_sta = false;
4291         int err;
4292
4293         sband = local->hw.wiphy->bands[cbss->channel->band];
4294
4295         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4296                 return -EINVAL;
4297
4298         if (assoc) {
4299                 rcu_read_lock();
4300                 have_sta = sta_info_get(sdata, cbss->bssid);
4301                 rcu_read_unlock();
4302         }
4303
4304         if (!have_sta) {
4305                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4306                 if (!new_sta)
4307                         return -ENOMEM;
4308         }
4309
4310         if (new_sta || override) {
4311                 err = ieee80211_prep_channel(sdata, cbss);
4312                 if (err) {
4313                         if (new_sta)
4314                                 sta_info_free(local, new_sta);
4315                         return -EINVAL;
4316                 }
4317         }
4318
4319         if (new_sta) {
4320                 u32 rates = 0, basic_rates = 0;
4321                 bool have_higher_than_11mbit;
4322                 int min_rate = INT_MAX, min_rate_index = -1;
4323                 struct ieee80211_chanctx_conf *chanctx_conf;
4324                 const struct cfg80211_bss_ies *ies;
4325                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4326                 u32 rate_flags;
4327
4328                 rcu_read_lock();
4329                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4330                 if (WARN_ON(!chanctx_conf)) {
4331                         rcu_read_unlock();
4332                         sta_info_free(local, new_sta);
4333                         return -EINVAL;
4334                 }
4335                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4336                 rcu_read_unlock();
4337
4338                 ieee80211_get_rates(sband, bss->supp_rates,
4339                                     bss->supp_rates_len,
4340                                     &rates, &basic_rates,
4341                                     &have_higher_than_11mbit,
4342                                     &min_rate, &min_rate_index,
4343                                     shift, rate_flags);
4344
4345                 /*
4346                  * This used to be a workaround for basic rates missing
4347                  * in the association response frame. Now that we no
4348                  * longer use the basic rates from there, it probably
4349                  * doesn't happen any more, but keep the workaround so
4350                  * in case some *other* APs are buggy in different ways
4351                  * we can connect -- with a warning.
4352                  */
4353                 if (!basic_rates && min_rate_index >= 0) {
4354                         sdata_info(sdata,
4355                                    "No basic rates, using min rate instead\n");
4356                         basic_rates = BIT(min_rate_index);
4357                 }
4358
4359                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4360                 sdata->vif.bss_conf.basic_rates = basic_rates;
4361
4362                 /* cf. IEEE 802.11 9.2.12 */
4363                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4364                     have_higher_than_11mbit)
4365                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4366                 else
4367                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4368
4369                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4370
4371                 /* set timing information */
4372                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4373                 rcu_read_lock();
4374                 ies = rcu_dereference(cbss->beacon_ies);
4375                 if (ies) {
4376                         const u8 *tim_ie;
4377
4378                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4379                         sdata->vif.bss_conf.sync_device_ts =
4380                                 bss->device_ts_beacon;
4381                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4382                                                   ies->data, ies->len);
4383                         if (tim_ie && tim_ie[1] >= 2)
4384                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4385                         else
4386                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4387                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4388                                                TIMING_BEACON_ONLY)) {
4389                         ies = rcu_dereference(cbss->proberesp_ies);
4390                         /* must be non-NULL since beacon IEs were NULL */
4391                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4392                         sdata->vif.bss_conf.sync_device_ts =
4393                                 bss->device_ts_presp;
4394                         sdata->vif.bss_conf.sync_dtim_count = 0;
4395                 } else {
4396                         sdata->vif.bss_conf.sync_tsf = 0;
4397                         sdata->vif.bss_conf.sync_device_ts = 0;
4398                         sdata->vif.bss_conf.sync_dtim_count = 0;
4399                 }
4400                 rcu_read_unlock();
4401
4402                 /* tell driver about BSSID, basic rates and timing */
4403                 ieee80211_bss_info_change_notify(sdata,
4404                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4405                         BSS_CHANGED_BEACON_INT);
4406
4407                 if (assoc)
4408                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4409
4410                 err = sta_info_insert(new_sta);
4411                 new_sta = NULL;
4412                 if (err) {
4413                         sdata_info(sdata,
4414                                    "failed to insert STA entry for the AP (error %d)\n",
4415                                    err);
4416                         return err;
4417                 }
4418         } else
4419                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4420
4421         /* Cancel scan to ensure that nothing interferes with connection */
4422         if (local->scanning)
4423                 ieee80211_scan_cancel(local);
4424
4425         return 0;
4426 }
4427
4428 /* config hooks */
4429 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4430                        struct cfg80211_auth_request *req)
4431 {
4432         struct ieee80211_local *local = sdata->local;
4433         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4434         struct ieee80211_mgd_auth_data *auth_data;
4435         u16 auth_alg;
4436         int err;
4437
4438         /* prepare auth data structure */
4439
4440         switch (req->auth_type) {
4441         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4442                 auth_alg = WLAN_AUTH_OPEN;
4443                 break;
4444         case NL80211_AUTHTYPE_SHARED_KEY:
4445                 if (IS_ERR(local->wep_tx_tfm))
4446                         return -EOPNOTSUPP;
4447                 auth_alg = WLAN_AUTH_SHARED_KEY;
4448                 break;
4449         case NL80211_AUTHTYPE_FT:
4450                 auth_alg = WLAN_AUTH_FT;
4451                 break;
4452         case NL80211_AUTHTYPE_NETWORK_EAP:
4453                 auth_alg = WLAN_AUTH_LEAP;
4454                 break;
4455         case NL80211_AUTHTYPE_SAE:
4456                 auth_alg = WLAN_AUTH_SAE;
4457                 break;
4458         default:
4459                 return -EOPNOTSUPP;
4460         }
4461
4462         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4463                             req->ie_len, GFP_KERNEL);
4464         if (!auth_data)
4465                 return -ENOMEM;
4466
4467         auth_data->bss = req->bss;
4468
4469         if (req->sae_data_len >= 4) {
4470                 __le16 *pos = (__le16 *) req->sae_data;
4471                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4472                 auth_data->sae_status = le16_to_cpu(pos[1]);
4473                 memcpy(auth_data->data, req->sae_data + 4,
4474                        req->sae_data_len - 4);
4475                 auth_data->data_len += req->sae_data_len - 4;
4476         }
4477
4478         if (req->ie && req->ie_len) {
4479                 memcpy(&auth_data->data[auth_data->data_len],
4480                        req->ie, req->ie_len);
4481                 auth_data->data_len += req->ie_len;
4482         }
4483
4484         if (req->key && req->key_len) {
4485                 auth_data->key_len = req->key_len;
4486                 auth_data->key_idx = req->key_idx;
4487                 memcpy(auth_data->key, req->key, req->key_len);
4488         }
4489
4490         auth_data->algorithm = auth_alg;
4491
4492         /* try to authenticate/probe */
4493
4494         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4495             ifmgd->assoc_data) {
4496                 err = -EBUSY;
4497                 goto err_free;
4498         }
4499
4500         if (ifmgd->auth_data)
4501                 ieee80211_destroy_auth_data(sdata, false);
4502
4503         /* prep auth_data so we don't go into idle on disassoc */
4504         ifmgd->auth_data = auth_data;
4505
4506         if (ifmgd->associated) {
4507                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4508
4509                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4510                                        WLAN_REASON_UNSPECIFIED,
4511                                        false, frame_buf);
4512
4513                 ieee80211_report_disconnect(sdata, frame_buf,
4514                                             sizeof(frame_buf), true,
4515                                             WLAN_REASON_UNSPECIFIED);
4516         }
4517
4518         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4519
4520         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4521         if (err)
4522                 goto err_clear;
4523
4524         err = ieee80211_auth(sdata);
4525         if (err) {
4526                 sta_info_destroy_addr(sdata, req->bss->bssid);
4527                 goto err_clear;
4528         }
4529
4530         /* hold our own reference */
4531         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4532         return 0;
4533
4534  err_clear:
4535         eth_zero_addr(ifmgd->bssid);
4536         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4537         ifmgd->auth_data = NULL;
4538         mutex_lock(&sdata->local->mtx);
4539         ieee80211_vif_release_channel(sdata);
4540         mutex_unlock(&sdata->local->mtx);
4541  err_free:
4542         kfree(auth_data);
4543         return err;
4544 }
4545
4546 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4547                                         const u8 *wmm_param, int len)
4548 {
4549         const u8 *pos;
4550         size_t left;
4551
4552         if (len < 8)
4553                 return false;
4554
4555         if (wmm_param[5] != 1 /* version */)
4556                 return false;
4557
4558         pos = wmm_param + 8;
4559         left = len - 8;
4560
4561         for (; left >= 4; left -= 4, pos += 4) {
4562                 u8 aifsn = pos[0] & 0x0f;
4563                 u8 ecwmin = pos[1] & 0x0f;
4564                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4565                 int aci = (pos[0] >> 5) & 0x03;
4566
4567                 if (aifsn < 2) {
4568                         sdata_info(sdata,
4569                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4570                                    aifsn, aci);
4571                         return false;
4572                 }
4573                 if (ecwmin > ecwmax) {
4574                         sdata_info(sdata,
4575                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4576                                    ecwmin, ecwmax, aci);
4577                         return false;
4578                 }
4579         }
4580
4581         return true;
4582 }
4583
4584 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4585                         struct cfg80211_assoc_request *req)
4586 {
4587         struct ieee80211_local *local = sdata->local;
4588         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4589         struct ieee80211_bss *bss = (void *)req->bss->priv;
4590         struct ieee80211_mgd_assoc_data *assoc_data;
4591         const struct cfg80211_bss_ies *beacon_ies;
4592         struct ieee80211_supported_band *sband;
4593         const u8 *ssidie, *ht_ie, *vht_ie;
4594         int i, err;
4595         bool override = false;
4596
4597         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4598         if (!assoc_data)
4599                 return -ENOMEM;
4600
4601         rcu_read_lock();
4602         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4603         if (!ssidie) {
4604                 rcu_read_unlock();
4605                 kfree(assoc_data);
4606                 return -EINVAL;
4607         }
4608         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4609         assoc_data->ssid_len = ssidie[1];
4610         rcu_read_unlock();
4611
4612         if (ifmgd->associated) {
4613                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4614
4615                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4616                                        WLAN_REASON_UNSPECIFIED,
4617                                        false, frame_buf);
4618
4619                 ieee80211_report_disconnect(sdata, frame_buf,
4620                                             sizeof(frame_buf), true,
4621                                             WLAN_REASON_UNSPECIFIED);
4622         }
4623
4624         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4625                 err = -EBUSY;
4626                 goto err_free;
4627         }
4628
4629         if (ifmgd->assoc_data) {
4630                 err = -EBUSY;
4631                 goto err_free;
4632         }
4633
4634         if (ifmgd->auth_data) {
4635                 bool match;
4636
4637                 /* keep sta info, bssid if matching */
4638                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4639                 ieee80211_destroy_auth_data(sdata, match);
4640         }
4641
4642         /* prepare assoc data */
4643
4644         ifmgd->beacon_crc_valid = false;
4645
4646         assoc_data->wmm = bss->wmm_used &&
4647                           (local->hw.queues >= IEEE80211_NUM_ACS);
4648         if (assoc_data->wmm) {
4649                 /* try to check validity of WMM params IE */
4650                 const struct cfg80211_bss_ies *ies;
4651                 const u8 *wp, *start, *end;
4652
4653                 rcu_read_lock();
4654                 ies = rcu_dereference(req->bss->ies);
4655                 start = ies->data;
4656                 end = start + ies->len;
4657
4658                 while (true) {
4659                         wp = cfg80211_find_vendor_ie(
4660                                 WLAN_OUI_MICROSOFT,
4661                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4662                                 start, end - start);
4663                         if (!wp)
4664                                 break;
4665                         start = wp + wp[1] + 2;
4666                         /* if this IE is too short, try the next */
4667                         if (wp[1] <= 4)
4668                                 continue;
4669                         /* if this IE is WMM params, we found what we wanted */
4670                         if (wp[6] == 1)
4671                                 break;
4672                 }
4673
4674                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4675                                                         wp[1] - 2)) {
4676                         assoc_data->wmm = false;
4677                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4678                 }
4679                 rcu_read_unlock();
4680         }
4681
4682         /*
4683          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4684          * We still associate in non-HT mode (11a/b/g) if any one of these
4685          * ciphers is configured as pairwise.
4686          * We can set this to true for non-11n hardware, that'll be checked
4687          * separately along with the peer capabilities.
4688          */
4689         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4690                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4691                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4692                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4693                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4694                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4695                         netdev_info(sdata->dev,
4696                                     "disabling HT/VHT due to WEP/TKIP use\n");
4697                 }
4698         }
4699
4700         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4701         sband = local->hw.wiphy->bands[req->bss->channel->band];
4702         if (!sband->ht_cap.ht_supported ||
4703             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4704             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4705                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4706                 if (!bss->wmm_used &&
4707                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4708                         netdev_info(sdata->dev,
4709                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4710         }
4711
4712         /* disable VHT if we don't support it or the AP doesn't use WMM */
4713         if (!sband->vht_cap.vht_supported ||
4714             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4715             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4716                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4717                 if (!bss->wmm_used &&
4718                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4719                         netdev_info(sdata->dev,
4720                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4721         }
4722
4723         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4724         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4725                sizeof(ifmgd->ht_capa_mask));
4726
4727         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4728         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4729                sizeof(ifmgd->vht_capa_mask));
4730
4731         if (req->ie && req->ie_len) {
4732                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4733                 assoc_data->ie_len = req->ie_len;
4734         }
4735
4736         assoc_data->bss = req->bss;
4737
4738         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4739                 if (ifmgd->powersave)
4740                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4741                 else
4742                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4743         } else
4744                 sdata->smps_mode = ifmgd->req_smps;
4745
4746         assoc_data->capability = req->bss->capability;
4747         assoc_data->supp_rates = bss->supp_rates;
4748         assoc_data->supp_rates_len = bss->supp_rates_len;
4749
4750         rcu_read_lock();
4751         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4752         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4753                 assoc_data->ap_ht_param =
4754                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4755         else
4756                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4757         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4758         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4759                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4760                        sizeof(struct ieee80211_vht_cap));
4761         else
4762                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4763         rcu_read_unlock();
4764
4765         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4766                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4767              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4768                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4769
4770         if (bss->wmm_used && bss->uapsd_supported &&
4771             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4772                 assoc_data->uapsd = true;
4773                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4774         } else {
4775                 assoc_data->uapsd = false;
4776                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4777         }
4778
4779         if (req->prev_bssid)
4780                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4781
4782         if (req->use_mfp) {
4783                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4784                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4785         } else {
4786                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4787                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4788         }
4789
4790         if (req->flags & ASSOC_REQ_USE_RRM)
4791                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4792         else
4793                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4794
4795         if (req->crypto.control_port)
4796                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4797         else
4798                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4799
4800         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4801         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4802         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4803                                                         sdata->vif.type);
4804
4805         /* kick off associate process */
4806
4807         ifmgd->assoc_data = assoc_data;
4808         ifmgd->dtim_period = 0;
4809         ifmgd->have_beacon = false;
4810
4811         /* override HT/VHT configuration only if the AP and we support it */
4812         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4813                 struct ieee80211_sta_ht_cap sta_ht_cap;
4814
4815                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4816                         override = true;
4817
4818                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4819                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4820
4821                 /* check for 40 MHz disable override */
4822                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4823                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4824                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4825                         override = true;
4826
4827                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4828                     req->flags & ASSOC_REQ_DISABLE_VHT)
4829                         override = true;
4830         }
4831
4832         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4833                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4834                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4835         }
4836
4837         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4838                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4839
4840         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4841         if (err)
4842                 goto err_clear;
4843
4844         rcu_read_lock();
4845         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4846
4847         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4848             !beacon_ies) {
4849                 /*
4850                  * Wait up to one beacon interval ...
4851                  * should this be more if we miss one?
4852                  */
4853                 sdata_info(sdata, "waiting for beacon from %pM\n",
4854                            ifmgd->bssid);
4855                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4856                 assoc_data->timeout_started = true;
4857                 assoc_data->need_beacon = true;
4858         } else if (beacon_ies) {
4859                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4860                                                     beacon_ies->data,
4861                                                     beacon_ies->len);
4862                 u8 dtim_count = 0;
4863
4864                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4865                         const struct ieee80211_tim_ie *tim;
4866                         tim = (void *)(tim_ie + 2);
4867                         ifmgd->dtim_period = tim->dtim_period;
4868                         dtim_count = tim->dtim_count;
4869                 }
4870                 ifmgd->have_beacon = true;
4871                 assoc_data->timeout = jiffies;
4872                 assoc_data->timeout_started = true;
4873
4874                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4875                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4876                         sdata->vif.bss_conf.sync_device_ts =
4877                                 bss->device_ts_beacon;
4878                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4879                 }
4880         } else {
4881                 assoc_data->timeout = jiffies;
4882                 assoc_data->timeout_started = true;
4883         }
4884         rcu_read_unlock();
4885
4886         run_again(sdata, assoc_data->timeout);
4887
4888         if (bss->corrupt_data) {
4889                 char *corrupt_type = "data";
4890                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4891                         if (bss->corrupt_data &
4892                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4893                                 corrupt_type = "beacon and probe response";
4894                         else
4895                                 corrupt_type = "beacon";
4896                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4897                         corrupt_type = "probe response";
4898                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4899                            corrupt_type);
4900         }
4901
4902         return 0;
4903  err_clear:
4904         eth_zero_addr(ifmgd->bssid);
4905         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4906         ifmgd->assoc_data = NULL;
4907  err_free:
4908         kfree(assoc_data);
4909         return err;
4910 }
4911
4912 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4913                          struct cfg80211_deauth_request *req)
4914 {
4915         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4916         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4917         bool tx = !req->local_state_change;
4918
4919         if (ifmgd->auth_data &&
4920             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4921                 sdata_info(sdata,
4922                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4923                            req->bssid, req->reason_code,
4924                            ieee80211_get_reason_code_string(req->reason_code));
4925
4926                 drv_mgd_prepare_tx(sdata->local, sdata);
4927                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4928                                                IEEE80211_STYPE_DEAUTH,
4929                                                req->reason_code, tx,
4930                                                frame_buf);
4931                 ieee80211_destroy_auth_data(sdata, false);
4932                 ieee80211_report_disconnect(sdata, frame_buf,
4933                                             sizeof(frame_buf), true,
4934                                             req->reason_code);
4935
4936                 return 0;
4937         }
4938
4939         if (ifmgd->associated &&
4940             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4941                 sdata_info(sdata,
4942                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4943                            req->bssid, req->reason_code,
4944                            ieee80211_get_reason_code_string(req->reason_code));
4945
4946                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4947                                        req->reason_code, tx, frame_buf);
4948                 ieee80211_report_disconnect(sdata, frame_buf,
4949                                             sizeof(frame_buf), true,
4950                                             req->reason_code);
4951                 return 0;
4952         }
4953
4954         return -ENOTCONN;
4955 }
4956
4957 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4958                            struct cfg80211_disassoc_request *req)
4959 {
4960         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4961         u8 bssid[ETH_ALEN];
4962         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4963
4964         /*
4965          * cfg80211 should catch this ... but it's racy since
4966          * we can receive a disassoc frame, process it, hand it
4967          * to cfg80211 while that's in a locked section already
4968          * trying to tell us that the user wants to disconnect.
4969          */
4970         if (ifmgd->associated != req->bss)
4971                 return -ENOLINK;
4972
4973         sdata_info(sdata,
4974                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4975                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4976
4977         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4978         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4979                                req->reason_code, !req->local_state_change,
4980                                frame_buf);
4981
4982         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4983                                     req->reason_code);
4984
4985         return 0;
4986 }
4987
4988 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4989 {
4990         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4991
4992         /*
4993          * Make sure some work items will not run after this,
4994          * they will not do anything but might not have been
4995          * cancelled when disconnecting.
4996          */
4997         cancel_work_sync(&ifmgd->monitor_work);
4998         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4999         cancel_work_sync(&ifmgd->request_smps_work);
5000         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5001         cancel_work_sync(&ifmgd->chswitch_work);
5002         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5003
5004         sdata_lock(sdata);
5005         if (ifmgd->assoc_data) {
5006                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5007                 ieee80211_destroy_assoc_data(sdata, false);
5008                 cfg80211_assoc_timeout(sdata->dev, bss);
5009         }
5010         if (ifmgd->auth_data)
5011                 ieee80211_destroy_auth_data(sdata, false);
5012         spin_lock_bh(&ifmgd->teardown_lock);
5013         if (ifmgd->teardown_skb) {
5014                 kfree_skb(ifmgd->teardown_skb);
5015                 ifmgd->teardown_skb = NULL;
5016                 ifmgd->orig_teardown_skb = NULL;
5017         }
5018         spin_unlock_bh(&ifmgd->teardown_lock);
5019         del_timer_sync(&ifmgd->timer);
5020         sdata_unlock(sdata);
5021 }
5022
5023 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5024                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5025                                gfp_t gfp)
5026 {
5027         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5028
5029         trace_api_cqm_rssi_notify(sdata, rssi_event);
5030
5031         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5032 }
5033 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5034
5035 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5036 {
5037         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5038
5039         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5040
5041         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5042 }
5043 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);