net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  * Copyright (C) 2015 Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/pm_qos.h>
  24 #include <linux/crc32.h>
  25 #include <linux/slab.h>
  26 #include <linux/export.h>
  27 #include <net/mac80211.h>
  28 #include <asm/unaligned.h>
  29
  30 #include "ieee80211_i.h"
  31 #include "driver-ops.h"
  32 #include "rate.h"
  33 #include "led.h"
  34
  35 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  36 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  37 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  38 #define IEEE80211_AUTH_MAX_TRIES        3
  39 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  40 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  41 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  42 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  43 #define IEEE80211_ASSOC_MAX_TRIES       3
  44
  45 static int max_nullfunc_tries = 2;
  46 module_param(max_nullfunc_tries, int, 0644);
  47 MODULE_PARM_DESC(max_nullfunc_tries,
  48                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  49
  50 static int max_probe_tries = 5;
  51 module_param(max_probe_tries, int, 0644);
  52 MODULE_PARM_DESC(max_probe_tries,
  53                  "Maximum probe tries before disconnecting (reason 4).");
  54
  55 /*
  56  * Beacon loss timeout is calculated as N frames times the
  57  * advertised beacon interval.  This may need to be somewhat
  58  * higher than what hardware might detect to account for
  59  * delays in the host processing frames. But since we also
  60  * probe on beacon miss before declaring the connection lost
  61  * default to what we want.
  62  */
  63 static int beacon_loss_count = 7;
  64 module_param(beacon_loss_count, int, 0644);
  65 MODULE_PARM_DESC(beacon_loss_count,
  66                  "Number of beacon intervals before we decide beacon was lost.");
  67
  68 /*
  69  * Time the connection can be idle before we probe
  70  * it to see if we can still talk to the AP.
  71  */
  72 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  73 /*
  74  * Time we wait for a probe response after sending
  75  * a probe request because of beacon loss or for
  76  * checking the connection still works.
  77  */
  78 static int probe_wait_ms = 500;
  79 module_param(probe_wait_ms, int, 0644);
  80 MODULE_PARM_DESC(probe_wait_ms,
  81                  "Maximum time(ms) to wait for probe response"
  82                  " before disconnecting (reason 4).");
  83
  84 /*
  85  * How many Beacon frames need to have been used in average signal strength
  86  * before starting to indicate signal change events.
  87  */
  88 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  89
  90 /*
  91  * We can have multiple work items (and connection probing)
  92  * scheduling this timer, but we need to take care to only
  93  * reschedule it when it should fire _earlier_ than it was
  94  * asked for before, or if it's not pending right now. This
  95  * function ensures that. Note that it then is required to
  96  * run this function for all timeouts after the first one
  97  * has happened -- the work that runs from this timer will
  98  * do that.
  99  */
 100 static void run_again(struct ieee80211_sub_if_data *sdata,
 101                       unsigned long timeout)
 102 {
 103         sdata_assert_lock(sdata);
 104
 105         if (!timer_pending(&sdata->u.mgd.timer) ||
 106             time_before(timeout, sdata->u.mgd.timer.expires))
 107                 mod_timer(&sdata->u.mgd.timer, timeout);
 108 }
 109
 110 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 111 {
 112         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 113                 return;
 114
 115         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 116                 return;
 117
 118         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 119                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 120 }
 121
 122 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 123 {
 124         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 125
 126         if (unlikely(!sdata->u.mgd.associated))
 127                 return;
 128
 129         ifmgd->probe_send_count = 0;
 130
 131         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 132                 return;
 133
 134         mod_timer(&sdata->u.mgd.conn_mon_timer,
 135                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 136 }
 137
 138 static int ecw2cw(int ecw)
 139 {
 140         return (1 << ecw) - 1;
 141 }
 142
 143 static u32
 144 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 145                              struct ieee80211_supported_band *sband,
 146                              struct ieee80211_channel *channel,
 147                              const struct ieee80211_ht_cap *ht_cap,
 148                              const struct ieee80211_ht_operation *ht_oper,
 149                              const struct ieee80211_vht_operation *vht_oper,
 150                              struct cfg80211_chan_def *chandef, bool tracking)
 151 {
 152         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 153         struct cfg80211_chan_def vht_chandef;
 154         struct ieee80211_sta_ht_cap sta_ht_cap;
 155         u32 ht_cfreq, ret;
 156
 157         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 158         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 159
 160         chandef->chan = channel;
 161         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 162         chandef->center_freq1 = channel->center_freq;
 163         chandef->center_freq2 = 0;
 164
 165         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 166                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 167                 goto out;
 168         }
 169
 170         chandef->width = NL80211_CHAN_WIDTH_20;
 171
 172         if (!(ht_cap->cap_info &
 173               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 174                 ret = IEEE80211_STA_DISABLE_40MHZ;
 175                 vht_chandef = *chandef;
 176                 goto out;
 177         }
 178
 179         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 180                                                   channel->band);
 181         /* check that channel matches the right operating channel */
 182         if (!tracking && channel->center_freq != ht_cfreq) {
 183                 /*
 184                  * It's possible that some APs are confused here;
 185                  * Netgear WNDR3700 sometimes reports 4 higher than
 186                  * the actual channel in association responses, but
 187                  * since we look at probe response/beacon data here
 188                  * it should be OK.
 189                  */
 190                 sdata_info(sdata,
 191                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 192                            channel->center_freq, ht_cfreq,
 193                            ht_oper->primary_chan, channel->band);
 194                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 195                 goto out;
 196         }
 197
 198         /* check 40 MHz support, if we have it */
 199         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 200                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 201                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 202                         chandef->width = NL80211_CHAN_WIDTH_40;
 203                         chandef->center_freq1 += 10;
 204                         break;
 205                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 206                         chandef->width = NL80211_CHAN_WIDTH_40;
 207                         chandef->center_freq1 -= 10;
 208                         break;
 209                 }
 210         } else {
 211                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 212                 ret = IEEE80211_STA_DISABLE_VHT;
 213                 /* also mark 40 MHz disabled */
 214                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 215                 goto out;
 216         }
 217
 218         if (!vht_oper || !sband->vht_cap.vht_supported) {
 219                 ret = IEEE80211_STA_DISABLE_VHT;
 220                 goto out;
 221         }
 222
 223         vht_chandef.chan = channel;
 224         vht_chandef.center_freq1 =
 225                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 226                                                channel->band);
 227         vht_chandef.center_freq2 = 0;
 228
 229         switch (vht_oper->chan_width) {
 230         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 231                 vht_chandef.width = chandef->width;
 232                 vht_chandef.center_freq1 = chandef->center_freq1;
 233                 break;
 234         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 235                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 236                 break;
 237         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 238                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 239                 break;
 240         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 241                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 242                 vht_chandef.center_freq2 =
 243                         ieee80211_channel_to_frequency(
 244                                 vht_oper->center_freq_seg2_idx,
 245                                 channel->band);
 246                 break;
 247         default:
 248                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 249                         sdata_info(sdata,
 250                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 251                                    vht_oper->chan_width);
 252                 ret = IEEE80211_STA_DISABLE_VHT;
 253                 goto out;
 254         }
 255
 256         if (!cfg80211_chandef_valid(&vht_chandef)) {
 257                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 258                         sdata_info(sdata,
 259                                    "AP VHT information is invalid, disable VHT\n");
 260                 ret = IEEE80211_STA_DISABLE_VHT;
 261                 goto out;
 262         }
 263
 264         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 265                 ret = 0;
 266                 goto out;
 267         }
 268
 269         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 270                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 271                         sdata_info(sdata,
 272                                    "AP VHT information doesn't match HT, disable VHT\n");
 273                 ret = IEEE80211_STA_DISABLE_VHT;
 274                 goto out;
 275         }
 276
 277         *chandef = vht_chandef;
 278
 279         ret = 0;
 280
 281 out:
 282         /*
 283          * When tracking the current AP, don't do any further checks if the
 284          * new chandef is identical to the one we're currently using for the
 285          * connection. This keeps us from playing ping-pong with regulatory,
 286          * without it the following can happen (for example):
 287          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 288          *  - AP advertises regdom US
 289          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 290          *  - the code below detects an unsupported channel, downgrades, and
 291          *    we disconnect from the AP in the caller
 292          *  - disconnect causes CRDA to reload world regdomain and the game
 293          *    starts anew.
 294          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 295          *
 296          * It seems possible that there are still scenarios with CSA or real
 297          * bandwidth changes where a this could happen, but those cases are
 298          * less common and wouldn't completely prevent using the AP.
 299          */
 300         if (tracking &&
 301             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 302                 return ret;
 303
 304         /* don't print the message below for VHT mismatch if VHT is disabled */
 305         if (ret & IEEE80211_STA_DISABLE_VHT)
 306                 vht_chandef = *chandef;
 307
 308         /*
 309          * Ignore the DISABLED flag when we're already connected and only
 310          * tracking the APs beacon for bandwidth changes - otherwise we
 311          * might get disconnected here if we connect to an AP, update our
 312          * regulatory information based on the AP's country IE and the
 313          * information we have is wrong/outdated and disables the channel
 314          * that we're actually using for the connection to the AP.
 315          */
 316         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 317                                         tracking ? 0 :
 318                                                    IEEE80211_CHAN_DISABLED)) {
 319                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 320                         ret = IEEE80211_STA_DISABLE_HT |
 321                               IEEE80211_STA_DISABLE_VHT;
 322                         break;
 323                 }
 324
 325                 ret |= ieee80211_chandef_downgrade(chandef);
 326         }
 327
 328         if (chandef->width != vht_chandef.width && !tracking)
 329                 sdata_info(sdata,
 330                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 331
 332         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 333         return ret;
 334 }
 335
 336 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 337                                struct sta_info *sta,
 338                                const struct ieee80211_ht_cap *ht_cap,
 339                                const struct ieee80211_ht_operation *ht_oper,
 340                                const struct ieee80211_vht_operation *vht_oper,
 341                                const u8 *bssid, u32 *changed)
 342 {
 343         struct ieee80211_local *local = sdata->local;
 344         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 345         struct ieee80211_supported_band *sband;
 346         struct ieee80211_channel *chan;
 347         struct cfg80211_chan_def chandef;
 348         u16 ht_opmode;
 349         u32 flags;
 350         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 351         int ret;
 352
 353         /* if HT was/is disabled, don't track any bandwidth changes */
 354         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 355                 return 0;
 356
 357         /* don't check VHT if we associated as non-VHT station */
 358         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 359                 vht_oper = NULL;
 360
 361         if (WARN_ON_ONCE(!sta))
 362                 return -EINVAL;
 363
 364         /*
 365          * if bss configuration changed store the new one -
 366          * this may be applicable even if channel is identical
 367          */
 368         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 369         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 370                 *changed |= BSS_CHANGED_HT;
 371                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 372         }
 373
 374         chan = sdata->vif.bss_conf.chandef.chan;
 375         sband = local->hw.wiphy->bands[chan->band];
 376
 377         /* calculate new channel (type) based on HT/VHT operation IEs */
 378         flags = ieee80211_determine_chantype(sdata, sband, chan,
 379                                              ht_cap, ht_oper, vht_oper,
 380                                              &chandef, true);
 381
 382         /*
 383          * Downgrade the new channel if we associated with restricted
 384          * capabilities. For example, if we associated as a 20 MHz STA
 385          * to a 40 MHz AP (due to regulatory, capabilities or config
 386          * reasons) then switching to a 40 MHz channel now won't do us
 387          * any good -- we couldn't use it with the AP.
 388          */
 389         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 390             chandef.width == NL80211_CHAN_WIDTH_80P80)
 391                 flags |= ieee80211_chandef_downgrade(&chandef);
 392         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 393             chandef.width == NL80211_CHAN_WIDTH_160)
 394                 flags |= ieee80211_chandef_downgrade(&chandef);
 395         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 396             chandef.width > NL80211_CHAN_WIDTH_20)
 397                 flags |= ieee80211_chandef_downgrade(&chandef);
 398
 399         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 400                 return 0;
 401
 402         sdata_info(sdata,
 403                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 404                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 405                    chandef.center_freq1, chandef.center_freq2);
 406
 407         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 408                                       IEEE80211_STA_DISABLE_VHT |
 409                                       IEEE80211_STA_DISABLE_40MHZ |
 410                                       IEEE80211_STA_DISABLE_80P80MHZ |
 411                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 412             !cfg80211_chandef_valid(&chandef)) {
 413                 sdata_info(sdata,
 414                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 415                            ifmgd->bssid);
 416                 return -EINVAL;
 417         }
 418
 419         switch (chandef.width) {
 420         case NL80211_CHAN_WIDTH_20_NOHT:
 421         case NL80211_CHAN_WIDTH_20:
 422                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 423                 break;
 424         case NL80211_CHAN_WIDTH_40:
 425                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 426                 break;
 427         case NL80211_CHAN_WIDTH_80:
 428                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 429                 break;
 430         case NL80211_CHAN_WIDTH_80P80:
 431         case NL80211_CHAN_WIDTH_160:
 432                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 433                 break;
 434         default:
 435                 return -EINVAL;
 436         }
 437
 438         if (new_sta_bw > sta->cur_max_bandwidth)
 439                 new_sta_bw = sta->cur_max_bandwidth;
 440
 441         if (new_sta_bw < sta->sta.bandwidth) {
 442                 sta->sta.bandwidth = new_sta_bw;
 443                 rate_control_rate_update(local, sband, sta,
 444                                          IEEE80211_RC_BW_CHANGED);
 445         }
 446
 447         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 448         if (ret) {
 449                 sdata_info(sdata,
 450                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 451                            ifmgd->bssid);
 452                 return ret;
 453         }
 454
 455         if (new_sta_bw > sta->sta.bandwidth) {
 456                 sta->sta.bandwidth = new_sta_bw;
 457                 rate_control_rate_update(local, sband, sta,
 458                                          IEEE80211_RC_BW_CHANGED);
 459         }
 460
 461         return 0;
 462 }
 463
 464 /* frame sending functions */
 465
 466 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 467                                 struct sk_buff *skb, u8 ap_ht_param,
 468                                 struct ieee80211_supported_band *sband,
 469                                 struct ieee80211_channel *channel,
 470                                 enum ieee80211_smps_mode smps)
 471 {
 472         u8 *pos;
 473         u32 flags = channel->flags;
 474         u16 cap;
 475         struct ieee80211_sta_ht_cap ht_cap;
 476
 477         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 478
 479         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 480         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 481
 482         /* determine capability flags */
 483         cap = ht_cap.cap;
 484
 485         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 486         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 487                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 488                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 489                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 490                 }
 491                 break;
 492         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 493                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 494                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 495                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 496                 }
 497                 break;
 498         }
 499
 500         /*
 501          * If 40 MHz was disabled associate as though we weren't
 502          * capable of 40 MHz -- some broken APs will never fall
 503          * back to trying to transmit in 20 MHz.
 504          */
 505         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 506                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 507                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 508         }
 509
 510         /* set SM PS mode properly */
 511         cap &= ~IEEE80211_HT_CAP_SM_PS;
 512         switch (smps) {
 513         case IEEE80211_SMPS_AUTOMATIC:
 514         case IEEE80211_SMPS_NUM_MODES:
 515                 WARN_ON(1);
 516         case IEEE80211_SMPS_OFF:
 517                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 518                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 519                 break;
 520         case IEEE80211_SMPS_STATIC:
 521                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 522                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 523                 break;
 524         case IEEE80211_SMPS_DYNAMIC:
 525                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 526                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 527                 break;
 528         }
 529
 530         /* reserve and fill IE */
 531         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 532         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 533 }
 534
 535 /* This function determines vht capability flags for the association
 536  * and builds the IE.
 537  * Note - the function may set the owner of the MU-MIMO capability
 538  */
 539 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 540                                  struct sk_buff *skb,
 541                                  struct ieee80211_supported_band *sband,
 542                                  struct ieee80211_vht_cap *ap_vht_cap)
 543 {
 544         struct ieee80211_local *local = sdata->local;
 545         u8 *pos;
 546         u32 cap;
 547         struct ieee80211_sta_vht_cap vht_cap;
 548         u32 mask, ap_bf_sts, our_bf_sts;
 549
 550         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 551
 552         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 553         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 554
 555         /* determine capability flags */
 556         cap = vht_cap.cap;
 557
 558         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 559                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 560
 561                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 562                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 563                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 564                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 565         }
 566
 567         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 568                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 569                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 570         }
 571
 572         /*
 573          * Some APs apparently get confused if our capabilities are better
 574          * than theirs, so restrict what we advertise in the assoc request.
 575          */
 576         if (!(ap_vht_cap->vht_cap_info &
 577                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 578                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 579                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 580         else if (!(ap_vht_cap->vht_cap_info &
 581                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 582                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 583
 584         /*
 585          * If some other vif is using the MU-MIMO capablity we cannot associate
 586          * using MU-MIMO - this will lead to contradictions in the group-id
 587          * mechanism.
 588          * Ownership is defined since association request, in order to avoid
 589          * simultaneous associations with MU-MIMO.
 590          */
 591         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 592                 bool disable_mu_mimo = false;
 593                 struct ieee80211_sub_if_data *other;
 594
 595                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 596                         if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
 597                                 disable_mu_mimo = true;
 598                                 break;
 599                         }
 600                 }
 601                 if (disable_mu_mimo)
 602                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 603                 else
 604                         sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
 605         }
 606
 607         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 608
 609         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 610         our_bf_sts = cap & mask;
 611
 612         if (ap_bf_sts < our_bf_sts) {
 613                 cap &= ~mask;
 614                 cap |= ap_bf_sts;
 615         }
 616
 617         /* reserve and fill IE */
 618         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 619         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 620 }
 621
 622 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 623 {
 624         struct ieee80211_local *local = sdata->local;
 625         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 626         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 627         struct sk_buff *skb;
 628         struct ieee80211_mgmt *mgmt;
 629         u8 *pos, qos_info;
 630         size_t offset = 0, noffset;
 631         int i, count, rates_len, supp_rates_len, shift;
 632         u16 capab;
 633         struct ieee80211_supported_band *sband;
 634         struct ieee80211_chanctx_conf *chanctx_conf;
 635         struct ieee80211_channel *chan;
 636         u32 rate_flags, rates = 0;
 637
 638         sdata_assert_lock(sdata);
 639
 640         rcu_read_lock();
 641         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 642         if (WARN_ON(!chanctx_conf)) {
 643                 rcu_read_unlock();
 644                 return;
 645         }
 646         chan = chanctx_conf->def.chan;
 647         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 648         rcu_read_unlock();
 649         sband = local->hw.wiphy->bands[chan->band];
 650         shift = ieee80211_vif_get_shift(&sdata->vif);
 651
 652         if (assoc_data->supp_rates_len) {
 653                 /*
 654                  * Get all rates supported by the device and the AP as
 655                  * some APs don't like getting a superset of their rates
 656                  * in the association request (e.g. D-Link DAP 1353 in
 657                  * b-only mode)...
 658                  */
 659                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 660                                                      assoc_data->supp_rates,
 661                                                      assoc_data->supp_rates_len,
 662                                                      &rates);
 663         } else {
 664                 /*
 665                  * In case AP not provide any supported rates information
 666                  * before association, we send information element(s) with
 667                  * all rates that we support.
 668                  */
 669                 rates_len = 0;
 670                 for (i = 0; i < sband->n_bitrates; i++) {
 671                         if ((rate_flags & sband->bitrates[i].flags)
 672                             != rate_flags)
 673                                 continue;
 674                         rates |= BIT(i);
 675                         rates_len++;
 676                 }
 677         }
 678
 679         skb = alloc_skb(local->hw.extra_tx_headroom +
 680                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 681                         2 + assoc_data->ssid_len + /* SSID */
 682                         4 + rates_len + /* (extended) rates */
 683                         4 + /* power capability */
 684                         2 + 2 * sband->n_channels + /* supported channels */
 685                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 686                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 687                         assoc_data->ie_len + /* extra IEs */
 688                         9, /* WMM */
 689                         GFP_KERNEL);
 690         if (!skb)
 691                 return;
 692
 693         skb_reserve(skb, local->hw.extra_tx_headroom);
 694
 695         capab = WLAN_CAPABILITY_ESS;
 696
 697         if (sband->band == IEEE80211_BAND_2GHZ) {
 698                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 699                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 700         }
 701
 702         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 703                 capab |= WLAN_CAPABILITY_PRIVACY;
 704
 705         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 706             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 707                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 708
 709         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 710                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 711
 712         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 713         memset(mgmt, 0, 24);
 714         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 715         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 716         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 717
 718         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 719                 skb_put(skb, 10);
 720                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 721                                                   IEEE80211_STYPE_REASSOC_REQ);
 722                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 723                 mgmt->u.reassoc_req.listen_interval =
 724                                 cpu_to_le16(local->hw.conf.listen_interval);
 725                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 726                        ETH_ALEN);
 727         } else {
 728                 skb_put(skb, 4);
 729                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 730                                                   IEEE80211_STYPE_ASSOC_REQ);
 731                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 732                 mgmt->u.assoc_req.listen_interval =
 733                                 cpu_to_le16(local->hw.conf.listen_interval);
 734         }
 735
 736         /* SSID */
 737         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 738         *pos++ = WLAN_EID_SSID;
 739         *pos++ = assoc_data->ssid_len;
 740         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 741
 742         /* add all rates which were marked to be used above */
 743         supp_rates_len = rates_len;
 744         if (supp_rates_len > 8)
 745                 supp_rates_len = 8;
 746
 747         pos = skb_put(skb, supp_rates_len + 2);
 748         *pos++ = WLAN_EID_SUPP_RATES;
 749         *pos++ = supp_rates_len;
 750
 751         count = 0;
 752         for (i = 0; i < sband->n_bitrates; i++) {
 753                 if (BIT(i) & rates) {
 754                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 755                                                 5 * (1 << shift));
 756                         *pos++ = (u8) rate;
 757                         if (++count == 8)
 758                                 break;
 759                 }
 760         }
 761
 762         if (rates_len > count) {
 763                 pos = skb_put(skb, rates_len - count + 2);
 764                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 765                 *pos++ = rates_len - count;
 766
 767                 for (i++; i < sband->n_bitrates; i++) {
 768                         if (BIT(i) & rates) {
 769                                 int rate;
 770                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 771                                                     5 * (1 << shift));
 772                                 *pos++ = (u8) rate;
 773                         }
 774                 }
 775         }
 776
 777         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 778             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 779                 pos = skb_put(skb, 4);
 780                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 781                 *pos++ = 2;
 782                 *pos++ = 0; /* min tx power */
 783                  /* max tx power */
 784                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 785         }
 786
 787         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 788                 /* TODO: get this in reg domain format */
 789                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 790                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 791                 *pos++ = 2 * sband->n_channels;
 792                 for (i = 0; i < sband->n_channels; i++) {
 793                         *pos++ = ieee80211_frequency_to_channel(
 794                                         sband->channels[i].center_freq);
 795                         *pos++ = 1; /* one channel in the subband*/
 796                 }
 797         }
 798
 799         /* if present, add any custom IEs that go before HT */
 800         if (assoc_data->ie_len) {
 801                 static const u8 before_ht[] = {
 802                         WLAN_EID_SSID,
 803                         WLAN_EID_SUPP_RATES,
 804                         WLAN_EID_EXT_SUPP_RATES,
 805                         WLAN_EID_PWR_CAPABILITY,
 806                         WLAN_EID_SUPPORTED_CHANNELS,
 807                         WLAN_EID_RSN,
 808                         WLAN_EID_QOS_CAPA,
 809                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 810                         WLAN_EID_MOBILITY_DOMAIN,
 811                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 812                         WLAN_EID_RIC_DATA,              /* reassoc only */
 813                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 814                 };
 815                 static const u8 after_ric[] = {
 816                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 817                         WLAN_EID_HT_CAPABILITY,
 818                         WLAN_EID_BSS_COEX_2040,
 819                         WLAN_EID_EXT_CAPABILITY,
 820                         WLAN_EID_QOS_TRAFFIC_CAPA,
 821                         WLAN_EID_TIM_BCAST_REQ,
 822                         WLAN_EID_INTERWORKING,
 823                         /* 60GHz doesn't happen right now */
 824                         WLAN_EID_VHT_CAPABILITY,
 825                         WLAN_EID_OPMODE_NOTIF,
 826                 };
 827
 828                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 829                                                  assoc_data->ie_len,
 830                                                  before_ht,
 831                                                  ARRAY_SIZE(before_ht),
 832                                                  after_ric,
 833                                                  ARRAY_SIZE(after_ric),
 834                                                  offset);
 835                 pos = skb_put(skb, noffset - offset);
 836                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 837                 offset = noffset;
 838         }
 839
 840         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 841                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 842                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 843
 844         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 845                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 846                                     sband, chan, sdata->smps_mode);
 847
 848         /* if present, add any custom IEs that go before VHT */
 849         if (assoc_data->ie_len) {
 850                 static const u8 before_vht[] = {
 851                         WLAN_EID_SSID,
 852                         WLAN_EID_SUPP_RATES,
 853                         WLAN_EID_EXT_SUPP_RATES,
 854                         WLAN_EID_PWR_CAPABILITY,
 855                         WLAN_EID_SUPPORTED_CHANNELS,
 856                         WLAN_EID_RSN,
 857                         WLAN_EID_QOS_CAPA,
 858                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 859                         WLAN_EID_MOBILITY_DOMAIN,
 860                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 861                         WLAN_EID_HT_CAPABILITY,
 862                         WLAN_EID_BSS_COEX_2040,
 863                         WLAN_EID_EXT_CAPABILITY,
 864                         WLAN_EID_QOS_TRAFFIC_CAPA,
 865                         WLAN_EID_TIM_BCAST_REQ,
 866                         WLAN_EID_INTERWORKING,
 867                 };
 868
 869                 /* RIC already taken above, so no need to handle here anymore */
 870                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 871                                              before_vht, ARRAY_SIZE(before_vht),
 872                                              offset);
 873                 pos = skb_put(skb, noffset - offset);
 874                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 875                 offset = noffset;
 876         }
 877
 878         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 879                 ieee80211_add_vht_ie(sdata, skb, sband,
 880                                      &assoc_data->ap_vht_cap);
 881
 882         /* if present, add any custom non-vendor IEs that go after HT */
 883         if (assoc_data->ie_len) {
 884                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 885                                                     assoc_data->ie_len,
 886                                                     offset);
 887                 pos = skb_put(skb, noffset - offset);
 888                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 889                 offset = noffset;
 890         }
 891
 892         if (assoc_data->wmm) {
 893                 if (assoc_data->uapsd) {
 894                         qos_info = ifmgd->uapsd_queues;
 895                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 896                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 897                 } else {
 898                         qos_info = 0;
 899                 }
 900
 901                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 902         }
 903
 904         /* add any remaining custom (i.e. vendor specific here) IEs */
 905         if (assoc_data->ie_len) {
 906                 noffset = assoc_data->ie_len;
 907                 pos = skb_put(skb, noffset - offset);
 908                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 909         }
 910
 911         drv_mgd_prepare_tx(local, sdata);
 912
 913         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 914         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 915                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 916                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 917         ieee80211_tx_skb(sdata, skb);
 918 }
 919
 920 void ieee80211_send_pspoll(struct ieee80211_local *local,
 921                            struct ieee80211_sub_if_data *sdata)
 922 {
 923         struct ieee80211_pspoll *pspoll;
 924         struct sk_buff *skb;
 925
 926         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 927         if (!skb)
 928                 return;
 929
 930         pspoll = (struct ieee80211_pspoll *) skb->data;
 931         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 932
 933         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 934         ieee80211_tx_skb(sdata, skb);
 935 }
 936
 937 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 938                              struct ieee80211_sub_if_data *sdata,
 939                              bool powersave)
 940 {
 941         struct sk_buff *skb;
 942         struct ieee80211_hdr_3addr *nullfunc;
 943         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 944
 945         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 946         if (!skb)
 947                 return;
 948
 949         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 950         if (powersave)
 951                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 952
 953         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 954                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 955
 956         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 957                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 958
 959         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 960                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 961
 962         ieee80211_tx_skb(sdata, skb);
 963 }
 964
 965 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 966                                           struct ieee80211_sub_if_data *sdata)
 967 {
 968         struct sk_buff *skb;
 969         struct ieee80211_hdr *nullfunc;
 970         __le16 fc;
 971
 972         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 973                 return;
 974
 975         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 976         if (!skb)
 977                 return;
 978
 979         skb_reserve(skb, local->hw.extra_tx_headroom);
 980
 981         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 982         memset(nullfunc, 0, 30);
 983         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 984                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 985         nullfunc->frame_control = fc;
 986         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 987         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 988         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 989         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 990
 991         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 992         ieee80211_tx_skb(sdata, skb);
 993 }
 994
 995 /* spectrum management related things */
 996 static void ieee80211_chswitch_work(struct work_struct *work)
 997 {
 998         struct ieee80211_sub_if_data *sdata =
 999                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
1000         struct ieee80211_local *local = sdata->local;
1001         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1002         int ret;
1003
1004         if (!ieee80211_sdata_running(sdata))
1005                 return;
1006
1007         sdata_lock(sdata);
1008         mutex_lock(&local->mtx);
1009         mutex_lock(&local->chanctx_mtx);
1010
1011         if (!ifmgd->associated)
1012                 goto out;
1013
1014         if (!sdata->vif.csa_active)
1015                 goto out;
1016
1017         /*
1018          * using reservation isn't immediate as it may be deferred until later
1019          * with multi-vif. once reservation is complete it will re-schedule the
1020          * work with no reserved_chanctx so verify chandef to check if it
1021          * completed successfully
1022          */
1023
1024         if (sdata->reserved_chanctx) {
1025                 /*
1026                  * with multi-vif csa driver may call ieee80211_csa_finish()
1027                  * many times while waiting for other interfaces to use their
1028                  * reservations
1029                  */
1030                 if (sdata->reserved_ready)
1031                         goto out;
1032
1033                 ret = ieee80211_vif_use_reserved_context(sdata);
1034                 if (ret) {
1035                         sdata_info(sdata,
1036                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1037                                    ret);
1038                         ieee80211_queue_work(&sdata->local->hw,
1039                                              &ifmgd->csa_connection_drop_work);
1040                         goto out;
1041                 }
1042
1043                 goto out;
1044         }
1045
1046         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1047                                         &sdata->csa_chandef)) {
1048                 sdata_info(sdata,
1049                            "failed to finalize channel switch, disconnecting\n");
1050                 ieee80211_queue_work(&sdata->local->hw,
1051                                      &ifmgd->csa_connection_drop_work);
1052                 goto out;
1053         }
1054
1055         /* XXX: shouldn't really modify cfg80211-owned data! */
1056         ifmgd->associated->channel = sdata->csa_chandef.chan;
1057
1058         ifmgd->csa_waiting_bcn = true;
1059
1060         ieee80211_sta_reset_beacon_monitor(sdata);
1061         ieee80211_sta_reset_conn_monitor(sdata);
1062
1063 out:
1064         mutex_unlock(&local->chanctx_mtx);
1065         mutex_unlock(&local->mtx);
1066         sdata_unlock(sdata);
1067 }
1068
1069 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1070 {
1071         struct ieee80211_local *local = sdata->local;
1072         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1073         int ret;
1074
1075         sdata_assert_lock(sdata);
1076
1077         WARN_ON(!sdata->vif.csa_active);
1078
1079         if (sdata->csa_block_tx) {
1080                 ieee80211_wake_vif_queues(local, sdata,
1081                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1082                 sdata->csa_block_tx = false;
1083         }
1084
1085         sdata->vif.csa_active = false;
1086         ifmgd->csa_waiting_bcn = false;
1087
1088         ret = drv_post_channel_switch(sdata);
1089         if (ret) {
1090                 sdata_info(sdata,
1091                            "driver post channel switch failed, disconnecting\n");
1092                 ieee80211_queue_work(&local->hw,
1093                                      &ifmgd->csa_connection_drop_work);
1094                 return;
1095         }
1096
1097         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1098 }
1099
1100 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1101 {
1102         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1103         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1104
1105         trace_api_chswitch_done(sdata, success);
1106         if (!success) {
1107                 sdata_info(sdata,
1108                            "driver channel switch failed, disconnecting\n");
1109                 ieee80211_queue_work(&sdata->local->hw,
1110                                      &ifmgd->csa_connection_drop_work);
1111         } else {
1112                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1113         }
1114 }
1115 EXPORT_SYMBOL(ieee80211_chswitch_done);
1116
1117 static void ieee80211_chswitch_timer(unsigned long data)
1118 {
1119         struct ieee80211_sub_if_data *sdata =
1120                 (struct ieee80211_sub_if_data *) data;
1121
1122         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1123 }
1124
1125 static void
1126 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1127                                  u64 timestamp, u32 device_timestamp,
1128                                  struct ieee802_11_elems *elems,
1129                                  bool beacon)
1130 {
1131         struct ieee80211_local *local = sdata->local;
1132         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1133         struct cfg80211_bss *cbss = ifmgd->associated;
1134         struct ieee80211_chanctx_conf *conf;
1135         struct ieee80211_chanctx *chanctx;
1136         enum ieee80211_band current_band;
1137         struct ieee80211_csa_ie csa_ie;
1138         struct ieee80211_channel_switch ch_switch;
1139         int res;
1140
1141         sdata_assert_lock(sdata);
1142
1143         if (!cbss)
1144                 return;
1145
1146         if (local->scanning)
1147                 return;
1148
1149         /* disregard subsequent announcements if we are already processing */
1150         if (sdata->vif.csa_active)
1151                 return;
1152
1153         current_band = cbss->channel->band;
1154         memset(&csa_ie, 0, sizeof(csa_ie));
1155         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1156                                            ifmgd->flags,
1157                                            ifmgd->associated->bssid, &csa_ie);
1158         if (res < 0)
1159                 ieee80211_queue_work(&local->hw,
1160                                      &ifmgd->csa_connection_drop_work);
1161         if (res)
1162                 return;
1163
1164         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1165                                      IEEE80211_CHAN_DISABLED)) {
1166                 sdata_info(sdata,
1167                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1168                            ifmgd->associated->bssid,
1169                            csa_ie.chandef.chan->center_freq,
1170                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1171                            csa_ie.chandef.center_freq2);
1172                 ieee80211_queue_work(&local->hw,
1173                                      &ifmgd->csa_connection_drop_work);
1174                 return;
1175         }
1176
1177         if (cfg80211_chandef_identical(&csa_ie.chandef,
1178                                        &sdata->vif.bss_conf.chandef)) {
1179                 if (ifmgd->csa_ignored_same_chan)
1180                         return;
1181                 sdata_info(sdata,
1182                            "AP %pM tries to chanswitch to same channel, ignore\n",
1183                            ifmgd->associated->bssid);
1184                 ifmgd->csa_ignored_same_chan = true;
1185                 return;
1186         }
1187
1188         /*
1189          * Drop all TDLS peers - either we disconnect or move to a different
1190          * channel from this point on. There's no telling what our peer will do.
1191          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1192          * have an incompatible wider chandef.
1193          */
1194         ieee80211_teardown_tdls_peers(sdata);
1195
1196         mutex_lock(&local->mtx);
1197         mutex_lock(&local->chanctx_mtx);
1198         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1199                                          lockdep_is_held(&local->chanctx_mtx));
1200         if (!conf) {
1201                 sdata_info(sdata,
1202                            "no channel context assigned to vif?, disconnecting\n");
1203                 goto drop_connection;
1204         }
1205
1206         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1207
1208         if (local->use_chanctx &&
1209             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1210                 sdata_info(sdata,
1211                            "driver doesn't support chan-switch with channel contexts\n");
1212                 goto drop_connection;
1213         }
1214
1215         ch_switch.timestamp = timestamp;
1216         ch_switch.device_timestamp = device_timestamp;
1217         ch_switch.block_tx = csa_ie.mode;
1218         ch_switch.chandef = csa_ie.chandef;
1219         ch_switch.count = csa_ie.count;
1220
1221         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1222                 sdata_info(sdata,
1223                            "preparing for channel switch failed, disconnecting\n");
1224                 goto drop_connection;
1225         }
1226
1227         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1228                                             chanctx->mode, false);
1229         if (res) {
1230                 sdata_info(sdata,
1231                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1232                            res);
1233                 goto drop_connection;
1234         }
1235         mutex_unlock(&local->chanctx_mtx);
1236
1237         sdata->vif.csa_active = true;
1238         sdata->csa_chandef = csa_ie.chandef;
1239         sdata->csa_block_tx = csa_ie.mode;
1240         ifmgd->csa_ignored_same_chan = false;
1241
1242         if (sdata->csa_block_tx)
1243                 ieee80211_stop_vif_queues(local, sdata,
1244                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1245         mutex_unlock(&local->mtx);
1246
1247         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1248                                           csa_ie.count);
1249
1250         if (local->ops->channel_switch) {
1251                 /* use driver's channel switch callback */
1252                 drv_channel_switch(local, sdata, &ch_switch);
1253                 return;
1254         }
1255
1256         /* channel switch handled in software */
1257         if (csa_ie.count <= 1)
1258                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1259         else
1260                 mod_timer(&ifmgd->chswitch_timer,
1261                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1262                                          cbss->beacon_interval));
1263         return;
1264  drop_connection:
1265         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1266         mutex_unlock(&local->chanctx_mtx);
1267         mutex_unlock(&local->mtx);
1268 }
1269
1270 static bool
1271 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1272                                  struct ieee80211_channel *channel,
1273                                  const u8 *country_ie, u8 country_ie_len,
1274                                  const u8 *pwr_constr_elem,
1275                                  int *chan_pwr, int *pwr_reduction)
1276 {
1277         struct ieee80211_country_ie_triplet *triplet;
1278         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1279         int i, chan_increment;
1280         bool have_chan_pwr = false;
1281
1282         /* Invalid IE */
1283         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1284                 return false;
1285
1286         triplet = (void *)(country_ie + 3);
1287         country_ie_len -= 3;
1288
1289         switch (channel->band) {
1290         default:
1291                 WARN_ON_ONCE(1);
1292                 /* fall through */
1293         case IEEE80211_BAND_2GHZ:
1294         case IEEE80211_BAND_60GHZ:
1295                 chan_increment = 1;
1296                 break;
1297         case IEEE80211_BAND_5GHZ:
1298                 chan_increment = 4;
1299                 break;
1300         }
1301
1302         /* find channel */
1303         while (country_ie_len >= 3) {
1304                 u8 first_channel = triplet->chans.first_channel;
1305
1306                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1307                         goto next;
1308
1309                 for (i = 0; i < triplet->chans.num_channels; i++) {
1310                         if (first_channel + i * chan_increment == chan) {
1311                                 have_chan_pwr = true;
1312                                 *chan_pwr = triplet->chans.max_power;
1313                                 break;
1314                         }
1315                 }
1316                 if (have_chan_pwr)
1317                         break;
1318
1319  next:
1320                 triplet++;
1321                 country_ie_len -= 3;
1322         }
1323
1324         if (have_chan_pwr && pwr_constr_elem)
1325                 *pwr_reduction = *pwr_constr_elem;
1326         else
1327                 *pwr_reduction = 0;
1328
1329         return have_chan_pwr;
1330 }
1331
1332 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1333                                       struct ieee80211_channel *channel,
1334                                       const u8 *cisco_dtpc_ie,
1335                                       int *pwr_level)
1336 {
1337         /* From practical testing, the first data byte of the DTPC element
1338          * seems to contain the requested dBm level, and the CLI on Cisco
1339          * APs clearly state the range is -127 to 127 dBm, which indicates
1340          * a signed byte, although it seemingly never actually goes negative.
1341          * The other byte seems to always be zero.
1342          */
1343         *pwr_level = (__s8)cisco_dtpc_ie[4];
1344 }
1345
1346 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1347                                        struct ieee80211_channel *channel,
1348                                        struct ieee80211_mgmt *mgmt,
1349                                        const u8 *country_ie, u8 country_ie_len,
1350                                        const u8 *pwr_constr_ie,
1351                                        const u8 *cisco_dtpc_ie)
1352 {
1353         bool has_80211h_pwr = false, has_cisco_pwr = false;
1354         int chan_pwr = 0, pwr_reduction_80211h = 0;
1355         int pwr_level_cisco, pwr_level_80211h;
1356         int new_ap_level;
1357         __le16 capab = mgmt->u.probe_resp.capab_info;
1358
1359         if (country_ie &&
1360             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1361              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1362                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1363                         sdata, channel, country_ie, country_ie_len,
1364                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1365                 pwr_level_80211h =
1366                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1367         }
1368
1369         if (cisco_dtpc_ie) {
1370                 ieee80211_find_cisco_dtpc(
1371                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1372                 has_cisco_pwr = true;
1373         }
1374
1375         if (!has_80211h_pwr && !has_cisco_pwr)
1376                 return 0;
1377
1378         /* If we have both 802.11h and Cisco DTPC, apply both limits
1379          * by picking the smallest of the two power levels advertised.
1380          */
1381         if (has_80211h_pwr &&
1382             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1383                 sdata_dbg(sdata,
1384                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1385                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1386                           sdata->u.mgd.bssid);
1387                 new_ap_level = pwr_level_80211h;
1388         } else {  /* has_cisco_pwr is always true here. */
1389                 sdata_dbg(sdata,
1390                           "Limiting TX power to %d dBm as advertised by %pM\n",
1391                           pwr_level_cisco, sdata->u.mgd.bssid);
1392                 new_ap_level = pwr_level_cisco;
1393         }
1394
1395         if (sdata->ap_power_level == new_ap_level)
1396                 return 0;
1397
1398         sdata->ap_power_level = new_ap_level;
1399         if (__ieee80211_recalc_txpower(sdata))
1400                 return BSS_CHANGED_TXPOWER;
1401         return 0;
1402 }
1403
1404 /* powersave */
1405 static void ieee80211_enable_ps(struct ieee80211_local *local,
1406                                 struct ieee80211_sub_if_data *sdata)
1407 {
1408         struct ieee80211_conf *conf = &local->hw.conf;
1409
1410         /*
1411          * If we are scanning right now then the parameters will
1412          * take effect when scan finishes.
1413          */
1414         if (local->scanning)
1415                 return;
1416
1417         if (conf->dynamic_ps_timeout > 0 &&
1418             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1419                 mod_timer(&local->dynamic_ps_timer, jiffies +
1420                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1421         } else {
1422                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1423                         ieee80211_send_nullfunc(local, sdata, true);
1424
1425                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1426                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1427                         return;
1428
1429                 conf->flags |= IEEE80211_CONF_PS;
1430                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1431         }
1432 }
1433
1434 static void ieee80211_change_ps(struct ieee80211_local *local)
1435 {
1436         struct ieee80211_conf *conf = &local->hw.conf;
1437
1438         if (local->ps_sdata) {
1439                 ieee80211_enable_ps(local, local->ps_sdata);
1440         } else if (conf->flags & IEEE80211_CONF_PS) {
1441                 conf->flags &= ~IEEE80211_CONF_PS;
1442                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1443                 del_timer_sync(&local->dynamic_ps_timer);
1444                 cancel_work_sync(&local->dynamic_ps_enable_work);
1445         }
1446 }
1447
1448 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1449 {
1450         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1451         struct sta_info *sta = NULL;
1452         bool authorized = false;
1453
1454         if (!mgd->powersave)
1455                 return false;
1456
1457         if (mgd->broken_ap)
1458                 return false;
1459
1460         if (!mgd->associated)
1461                 return false;
1462
1463         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1464                 return false;
1465
1466         if (!mgd->have_beacon)
1467                 return false;
1468
1469         rcu_read_lock();
1470         sta = sta_info_get(sdata, mgd->bssid);
1471         if (sta)
1472                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1473         rcu_read_unlock();
1474
1475         return authorized;
1476 }
1477
1478 /* need to hold RTNL or interface lock */
1479 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1480 {
1481         struct ieee80211_sub_if_data *sdata, *found = NULL;
1482         int count = 0;
1483         int timeout;
1484
1485         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1486                 local->ps_sdata = NULL;
1487                 return;
1488         }
1489
1490         list_for_each_entry(sdata, &local->interfaces, list) {
1491                 if (!ieee80211_sdata_running(sdata))
1492                         continue;
1493                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1494                         /* If an AP vif is found, then disable PS
1495                          * by setting the count to zero thereby setting
1496                          * ps_sdata to NULL.
1497                          */
1498                         count = 0;
1499                         break;
1500                 }
1501                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1502                         continue;
1503                 found = sdata;
1504                 count++;
1505         }
1506
1507         if (count == 1 && ieee80211_powersave_allowed(found)) {
1508                 s32 beaconint_us;
1509
1510                 if (latency < 0)
1511                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1512
1513                 beaconint_us = ieee80211_tu_to_usec(
1514                                         found->vif.bss_conf.beacon_int);
1515
1516                 timeout = local->dynamic_ps_forced_timeout;
1517                 if (timeout < 0) {
1518                         /*
1519                          * Go to full PSM if the user configures a very low
1520                          * latency requirement.
1521                          * The 2000 second value is there for compatibility
1522                          * until the PM_QOS_NETWORK_LATENCY is configured
1523                          * with real values.
1524                          */
1525                         if (latency > (1900 * USEC_PER_MSEC) &&
1526                             latency != (2000 * USEC_PER_SEC))
1527                                 timeout = 0;
1528                         else
1529                                 timeout = 100;
1530                 }
1531                 local->hw.conf.dynamic_ps_timeout = timeout;
1532
1533                 if (beaconint_us > latency) {
1534                         local->ps_sdata = NULL;
1535                 } else {
1536                         int maxslp = 1;
1537                         u8 dtimper = found->u.mgd.dtim_period;
1538
1539                         /* If the TIM IE is invalid, pretend the value is 1 */
1540                         if (!dtimper)
1541                                 dtimper = 1;
1542                         else if (dtimper > 1)
1543                                 maxslp = min_t(int, dtimper,
1544                                                     latency / beaconint_us);
1545
1546                         local->hw.conf.max_sleep_period = maxslp;
1547                         local->hw.conf.ps_dtim_period = dtimper;
1548                         local->ps_sdata = found;
1549                 }
1550         } else {
1551                 local->ps_sdata = NULL;
1552         }
1553
1554         ieee80211_change_ps(local);
1555 }
1556
1557 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1558 {
1559         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1560
1561         if (sdata->vif.bss_conf.ps != ps_allowed) {
1562                 sdata->vif.bss_conf.ps = ps_allowed;
1563                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1564         }
1565 }
1566
1567 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1568 {
1569         struct ieee80211_local *local =
1570                 container_of(work, struct ieee80211_local,
1571                              dynamic_ps_disable_work);
1572
1573         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1574                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1575                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1576         }
1577
1578         ieee80211_wake_queues_by_reason(&local->hw,
1579                                         IEEE80211_MAX_QUEUE_MAP,
1580                                         IEEE80211_QUEUE_STOP_REASON_PS,
1581                                         false);
1582 }
1583
1584 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1585 {
1586         struct ieee80211_local *local =
1587                 container_of(work, struct ieee80211_local,
1588                              dynamic_ps_enable_work);
1589         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1590         struct ieee80211_if_managed *ifmgd;
1591         unsigned long flags;
1592         int q;
1593
1594         /* can only happen when PS was just disabled anyway */
1595         if (!sdata)
1596                 return;
1597
1598         ifmgd = &sdata->u.mgd;
1599
1600         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1601                 return;
1602
1603         if (local->hw.conf.dynamic_ps_timeout > 0) {
1604                 /* don't enter PS if TX frames are pending */
1605                 if (drv_tx_frames_pending(local)) {
1606                         mod_timer(&local->dynamic_ps_timer, jiffies +
1607                                   msecs_to_jiffies(
1608                                   local->hw.conf.dynamic_ps_timeout));
1609                         return;
1610                 }
1611
1612                 /*
1613                  * transmission can be stopped by others which leads to
1614                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1615                  * is not the actual idle state.
1616                  */
1617                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1618                 for (q = 0; q < local->hw.queues; q++) {
1619                         if (local->queue_stop_reasons[q]) {
1620                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1621                                                        flags);
1622                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1623                                           msecs_to_jiffies(
1624                                           local->hw.conf.dynamic_ps_timeout));
1625                                 return;
1626                         }
1627                 }
1628                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1629         }
1630
1631         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1632             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1633                 if (drv_tx_frames_pending(local)) {
1634                         mod_timer(&local->dynamic_ps_timer, jiffies +
1635                                   msecs_to_jiffies(
1636                                   local->hw.conf.dynamic_ps_timeout));
1637                 } else {
1638                         ieee80211_send_nullfunc(local, sdata, true);
1639                         /* Flush to get the tx status of nullfunc frame */
1640                         ieee80211_flush_queues(local, sdata, false);
1641                 }
1642         }
1643
1644         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1645               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1646             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1647                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1648                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1649                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1650         }
1651 }
1652
1653 void ieee80211_dynamic_ps_timer(unsigned long data)
1654 {
1655         struct ieee80211_local *local = (void *) data;
1656
1657         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1658 }
1659
1660 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1661 {
1662         struct delayed_work *delayed_work =
1663                 container_of(work, struct delayed_work, work);
1664         struct ieee80211_sub_if_data *sdata =
1665                 container_of(delayed_work, struct ieee80211_sub_if_data,
1666                              dfs_cac_timer_work);
1667         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1668
1669         mutex_lock(&sdata->local->mtx);
1670         if (sdata->wdev.cac_started) {
1671                 ieee80211_vif_release_channel(sdata);
1672                 cfg80211_cac_event(sdata->dev, &chandef,
1673                                    NL80211_RADAR_CAC_FINISHED,
1674                                    GFP_KERNEL);
1675         }
1676         mutex_unlock(&sdata->local->mtx);
1677 }
1678
1679 static bool
1680 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1681 {
1682         struct ieee80211_local *local = sdata->local;
1683         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1684         bool ret = false;
1685         int ac;
1686
1687         if (local->hw.queues < IEEE80211_NUM_ACS)
1688                 return false;
1689
1690         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1691                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1692                 int non_acm_ac;
1693                 unsigned long now = jiffies;
1694
1695                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1696                     tx_tspec->admitted_time &&
1697                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1698                         tx_tspec->consumed_tx_time = 0;
1699                         tx_tspec->time_slice_start = now;
1700
1701                         if (tx_tspec->downgraded)
1702                                 tx_tspec->action =
1703                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1704                 }
1705
1706                 switch (tx_tspec->action) {
1707                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1708                         /* take the original parameters */
1709                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[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                         tx_tspec->downgraded = false;
1715                         ret = true;
1716                         break;
1717                 case TX_TSPEC_ACTION_DOWNGRADE:
1718                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1719                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1720                                 ret = true;
1721                                 break;
1722                         }
1723                         /* downgrade next lower non-ACM AC */
1724                         for (non_acm_ac = ac + 1;
1725                              non_acm_ac < IEEE80211_NUM_ACS;
1726                              non_acm_ac++)
1727                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1728                                         break;
1729                         /* The loop will result in using BK even if it requires
1730                          * admission control, such configuration makes no sense
1731                          * and we have to transmit somehow - the AC selection
1732                          * does the same thing.
1733                          */
1734                         if (drv_conf_tx(local, sdata, ac,
1735                                         &sdata->tx_conf[non_acm_ac]))
1736                                 sdata_err(sdata,
1737                                           "failed to set TX queue parameters for queue %d\n",
1738                                           ac);
1739                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1740                         ret = true;
1741                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1742                                 tx_tspec->time_slice_start + HZ - now + 1);
1743                         break;
1744                 case TX_TSPEC_ACTION_NONE:
1745                         /* nothing now */
1746                         break;
1747                 }
1748         }
1749
1750         return ret;
1751 }
1752
1753 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1754 {
1755         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1756                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1757 }
1758
1759 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1760 {
1761         struct ieee80211_sub_if_data *sdata;
1762
1763         sdata = container_of(work, struct ieee80211_sub_if_data,
1764                              u.mgd.tx_tspec_wk.work);
1765         ieee80211_sta_handle_tspec_ac_params(sdata);
1766 }
1767
1768 /* MLME */
1769 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1770                                      struct ieee80211_sub_if_data *sdata,
1771                                      const u8 *wmm_param, size_t wmm_param_len)
1772 {
1773         struct ieee80211_tx_queue_params params;
1774         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1775         size_t left;
1776         int count;
1777         const u8 *pos;
1778         u8 uapsd_queues = 0;
1779
1780         if (!local->ops->conf_tx)
1781                 return false;
1782
1783         if (local->hw.queues < IEEE80211_NUM_ACS)
1784                 return false;
1785
1786         if (!wmm_param)
1787                 return false;
1788
1789         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1790                 return false;
1791
1792         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1793                 uapsd_queues = ifmgd->uapsd_queues;
1794
1795         count = wmm_param[6] & 0x0f;
1796         if (count == ifmgd->wmm_last_param_set)
1797                 return false;
1798         ifmgd->wmm_last_param_set = count;
1799
1800         pos = wmm_param + 8;
1801         left = wmm_param_len - 8;
1802
1803         memset(&params, 0, sizeof(params));
1804
1805         sdata->wmm_acm = 0;
1806         for (; left >= 4; left -= 4, pos += 4) {
1807                 int aci = (pos[0] >> 5) & 0x03;
1808                 int acm = (pos[0] >> 4) & 0x01;
1809                 bool uapsd = false;
1810                 int queue;
1811
1812                 switch (aci) {
1813                 case 1: /* AC_BK */
1814                         queue = 3;
1815                         if (acm)
1816                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1817                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1818                                 uapsd = true;
1819                         break;
1820                 case 2: /* AC_VI */
1821                         queue = 1;
1822                         if (acm)
1823                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1824                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1825                                 uapsd = true;
1826                         break;
1827                 case 3: /* AC_VO */
1828                         queue = 0;
1829                         if (acm)
1830                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1831                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1832                                 uapsd = true;
1833                         break;
1834                 case 0: /* AC_BE */
1835                 default:
1836                         queue = 2;
1837                         if (acm)
1838                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1839                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1840                                 uapsd = true;
1841                         break;
1842                 }
1843
1844                 params.aifs = pos[0] & 0x0f;
1845                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1846                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1847                 params.txop = get_unaligned_le16(pos + 2);
1848                 params.acm = acm;
1849                 params.uapsd = uapsd;
1850
1851                 mlme_dbg(sdata,
1852                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1853                          queue, aci, acm,
1854                          params.aifs, params.cw_min, params.cw_max,
1855                          params.txop, params.uapsd,
1856                          ifmgd->tx_tspec[queue].downgraded);
1857                 sdata->tx_conf[queue] = params;
1858                 if (!ifmgd->tx_tspec[queue].downgraded &&
1859                     drv_conf_tx(local, sdata, queue, &params))
1860                         sdata_err(sdata,
1861                                   "failed to set TX queue parameters for queue %d\n",
1862                                   queue);
1863         }
1864
1865         /* enable WMM or activate new settings */
1866         sdata->vif.bss_conf.qos = true;
1867         return true;
1868 }
1869
1870 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1871 {
1872         lockdep_assert_held(&sdata->local->mtx);
1873
1874         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1875         ieee80211_run_deferred_scan(sdata->local);
1876 }
1877
1878 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1879 {
1880         mutex_lock(&sdata->local->mtx);
1881         __ieee80211_stop_poll(sdata);
1882         mutex_unlock(&sdata->local->mtx);
1883 }
1884
1885 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1886                                            u16 capab, bool erp_valid, u8 erp)
1887 {
1888         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1889         u32 changed = 0;
1890         bool use_protection;
1891         bool use_short_preamble;
1892         bool use_short_slot;
1893
1894         if (erp_valid) {
1895                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1896                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1897         } else {
1898                 use_protection = false;
1899                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1900         }
1901
1902         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1903         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1904                 use_short_slot = true;
1905
1906         if (use_protection != bss_conf->use_cts_prot) {
1907                 bss_conf->use_cts_prot = use_protection;
1908                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1909         }
1910
1911         if (use_short_preamble != bss_conf->use_short_preamble) {
1912                 bss_conf->use_short_preamble = use_short_preamble;
1913                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1914         }
1915
1916         if (use_short_slot != bss_conf->use_short_slot) {
1917                 bss_conf->use_short_slot = use_short_slot;
1918                 changed |= BSS_CHANGED_ERP_SLOT;
1919         }
1920
1921         return changed;
1922 }
1923
1924 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1925                                      struct cfg80211_bss *cbss,
1926                                      u32 bss_info_changed)
1927 {
1928         struct ieee80211_bss *bss = (void *)cbss->priv;
1929         struct ieee80211_local *local = sdata->local;
1930         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1931
1932         bss_info_changed |= BSS_CHANGED_ASSOC;
1933         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1934                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1935
1936         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1937                 beacon_loss_count * bss_conf->beacon_int));
1938
1939         sdata->u.mgd.associated = cbss;
1940         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1941
1942         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1943
1944         if (sdata->vif.p2p) {
1945                 const struct cfg80211_bss_ies *ies;
1946
1947                 rcu_read_lock();
1948                 ies = rcu_dereference(cbss->ies);
1949                 if (ies) {
1950                         int ret;
1951
1952                         ret = cfg80211_get_p2p_attr(
1953                                         ies->data, ies->len,
1954                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1955                                         (u8 *) &bss_conf->p2p_noa_attr,
1956                                         sizeof(bss_conf->p2p_noa_attr));
1957                         if (ret >= 2) {
1958                                 sdata->u.mgd.p2p_noa_index =
1959                                         bss_conf->p2p_noa_attr.index;
1960                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1961                         }
1962                 }
1963                 rcu_read_unlock();
1964         }
1965
1966         /* just to be sure */
1967         ieee80211_stop_poll(sdata);
1968
1969         ieee80211_led_assoc(local, 1);
1970
1971         if (sdata->u.mgd.have_beacon) {
1972                 /*
1973                  * If the AP is buggy we may get here with no DTIM period
1974                  * known, so assume it's 1 which is the only safe assumption
1975                  * in that case, although if the TIM IE is broken powersave
1976                  * probably just won't work at all.
1977                  */
1978                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1979                 bss_conf->beacon_rate = bss->beacon_rate;
1980                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1981         } else {
1982                 bss_conf->beacon_rate = NULL;
1983                 bss_conf->dtim_period = 0;
1984         }
1985
1986         bss_conf->assoc = 1;
1987
1988         /* Tell the driver to monitor connection quality (if supported) */
1989         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1990             bss_conf->cqm_rssi_thold)
1991                 bss_info_changed |= BSS_CHANGED_CQM;
1992
1993         /* Enable ARP filtering */
1994         if (bss_conf->arp_addr_cnt)
1995                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1996
1997         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1998
1999         mutex_lock(&local->iflist_mtx);
2000         ieee80211_recalc_ps(local, -1);
2001         mutex_unlock(&local->iflist_mtx);
2002
2003         ieee80211_recalc_smps(sdata);
2004         ieee80211_recalc_ps_vif(sdata);
2005
2006         netif_carrier_on(sdata->dev);
2007 }
2008
2009 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2010                                    u16 stype, u16 reason, bool tx,
2011                                    u8 *frame_buf)
2012 {
2013         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2014         struct ieee80211_local *local = sdata->local;
2015         u32 changed = 0;
2016
2017         sdata_assert_lock(sdata);
2018
2019         if (WARN_ON_ONCE(tx && !frame_buf))
2020                 return;
2021
2022         if (WARN_ON(!ifmgd->associated))
2023                 return;
2024
2025         ieee80211_stop_poll(sdata);
2026
2027         ifmgd->associated = NULL;
2028         netif_carrier_off(sdata->dev);
2029
2030         /*
2031          * if we want to get out of ps before disassoc (why?) we have
2032          * to do it before sending disassoc, as otherwise the null-packet
2033          * won't be valid.
2034          */
2035         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2036                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2037                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2038         }
2039         local->ps_sdata = NULL;
2040
2041         /* disable per-vif ps */
2042         ieee80211_recalc_ps_vif(sdata);
2043
2044         /* make sure ongoing transmission finishes */
2045         synchronize_net();
2046
2047         /*
2048          * drop any frame before deauth/disassoc, this can be data or
2049          * management frame. Since we are disconnecting, we should not
2050          * insist sending these frames which can take time and delay
2051          * the disconnection and possible the roaming.
2052          */
2053         if (tx)
2054                 ieee80211_flush_queues(local, sdata, true);
2055
2056         /* deauthenticate/disassociate now */
2057         if (tx || frame_buf)
2058                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2059                                                reason, tx, frame_buf);
2060
2061         /* flush out frame - make sure the deauth was actually sent */
2062         if (tx)
2063                 ieee80211_flush_queues(local, sdata, false);
2064
2065         /* clear bssid only after building the needed mgmt frames */
2066         eth_zero_addr(ifmgd->bssid);
2067
2068         /* remove AP and TDLS peers */
2069         sta_info_flush(sdata);
2070
2071         /* finally reset all BSS / config parameters */
2072         changed |= ieee80211_reset_erp_info(sdata);
2073
2074         ieee80211_led_assoc(local, 0);
2075         changed |= BSS_CHANGED_ASSOC;
2076         sdata->vif.bss_conf.assoc = false;
2077
2078         ifmgd->p2p_noa_index = -1;
2079         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2080                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2081
2082         /* on the next assoc, re-program HT/VHT parameters */
2083         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2084         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2085         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2086         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2087         sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2088
2089         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2090
2091         del_timer_sync(&local->dynamic_ps_timer);
2092         cancel_work_sync(&local->dynamic_ps_enable_work);
2093
2094         /* Disable ARP filtering */
2095         if (sdata->vif.bss_conf.arp_addr_cnt)
2096                 changed |= BSS_CHANGED_ARP_FILTER;
2097
2098         sdata->vif.bss_conf.qos = false;
2099         changed |= BSS_CHANGED_QOS;
2100
2101         /* The BSSID (not really interesting) and HT changed */
2102         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2103         ieee80211_bss_info_change_notify(sdata, changed);
2104
2105         /* disassociated - set to defaults now */
2106         ieee80211_set_wmm_default(sdata, false);
2107
2108         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2109         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2110         del_timer_sync(&sdata->u.mgd.timer);
2111         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2112
2113         sdata->vif.bss_conf.dtim_period = 0;
2114         sdata->vif.bss_conf.beacon_rate = NULL;
2115
2116         ifmgd->have_beacon = false;
2117
2118         ifmgd->flags = 0;
2119         mutex_lock(&local->mtx);
2120         ieee80211_vif_release_channel(sdata);
2121
2122         sdata->vif.csa_active = false;
2123         ifmgd->csa_waiting_bcn = false;
2124         ifmgd->csa_ignored_same_chan = false;
2125         if (sdata->csa_block_tx) {
2126                 ieee80211_wake_vif_queues(local, sdata,
2127                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2128                 sdata->csa_block_tx = false;
2129         }
2130         mutex_unlock(&local->mtx);
2131
2132         /* existing TX TSPEC sessions no longer exist */
2133         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2134         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2135
2136         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2137 }
2138
2139 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2140                              struct ieee80211_hdr *hdr)
2141 {
2142         /*
2143          * We can postpone the mgd.timer whenever receiving unicast frames
2144          * from AP because we know that the connection is working both ways
2145          * at that time. But multicast frames (and hence also beacons) must
2146          * be ignored here, because we need to trigger the timer during
2147          * data idle periods for sending the periodic probe request to the
2148          * AP we're connected to.
2149          */
2150         if (is_multicast_ether_addr(hdr->addr1))
2151                 return;
2152
2153         ieee80211_sta_reset_conn_monitor(sdata);
2154 }
2155
2156 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2157 {
2158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2159         struct ieee80211_local *local = sdata->local;
2160
2161         mutex_lock(&local->mtx);
2162         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2163                 goto out;
2164
2165         __ieee80211_stop_poll(sdata);
2166
2167         mutex_lock(&local->iflist_mtx);
2168         ieee80211_recalc_ps(local, -1);
2169         mutex_unlock(&local->iflist_mtx);
2170
2171         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2172                 goto out;
2173
2174         /*
2175          * We've received a probe response, but are not sure whether
2176          * we have or will be receiving any beacons or data, so let's
2177          * schedule the timers again, just in case.
2178          */
2179         ieee80211_sta_reset_beacon_monitor(sdata);
2180
2181         mod_timer(&ifmgd->conn_mon_timer,
2182                   round_jiffies_up(jiffies +
2183                                    IEEE80211_CONNECTION_IDLE_TIME));
2184 out:
2185         mutex_unlock(&local->mtx);
2186 }
2187
2188 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2189                                            struct ieee80211_hdr *hdr,
2190                                            u16 tx_time)
2191 {
2192         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2193         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2194         int ac = ieee80211_ac_from_tid(tid);
2195         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2196         unsigned long now = jiffies;
2197
2198         if (likely(!tx_tspec->admitted_time))
2199                 return;
2200
2201         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2202                 tx_tspec->consumed_tx_time = 0;
2203                 tx_tspec->time_slice_start = now;
2204
2205                 if (tx_tspec->downgraded) {
2206                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2207                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2208                 }
2209         }
2210
2211         if (tx_tspec->downgraded)
2212                 return;
2213
2214         tx_tspec->consumed_tx_time += tx_time;
2215
2216         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2217                 tx_tspec->downgraded = true;
2218                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2219                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2220         }
2221 }
2222
2223 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2224                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2225 {
2226         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2227
2228         if (!ieee80211_is_data(hdr->frame_control))
2229             return;
2230
2231         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2232             sdata->u.mgd.probe_send_count > 0) {
2233                 if (ack)
2234                         ieee80211_sta_reset_conn_monitor(sdata);
2235                 else
2236                         sdata->u.mgd.nullfunc_failed = true;
2237                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2238                 return;
2239         }
2240
2241         if (ack)
2242                 ieee80211_sta_reset_conn_monitor(sdata);
2243 }
2244
2245 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2246 {
2247         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2248         const u8 *ssid;
2249         u8 *dst = ifmgd->associated->bssid;
2250         u8 unicast_limit = max(1, max_probe_tries - 3);
2251
2252         /*
2253          * Try sending broadcast probe requests for the last three
2254          * probe requests after the first ones failed since some
2255          * buggy APs only support broadcast probe requests.
2256          */
2257         if (ifmgd->probe_send_count >= unicast_limit)
2258                 dst = NULL;
2259
2260         /*
2261          * When the hardware reports an accurate Tx ACK status, it's
2262          * better to send a nullfunc frame instead of a probe request,
2263          * as it will kick us off the AP quickly if we aren't associated
2264          * anymore. The timeout will be reset if the frame is ACKed by
2265          * the AP.
2266          */
2267         ifmgd->probe_send_count++;
2268
2269         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2270                 ifmgd->nullfunc_failed = false;
2271                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2272         } else {
2273                 int ssid_len;
2274
2275                 rcu_read_lock();
2276                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2277                 if (WARN_ON_ONCE(ssid == NULL))
2278                         ssid_len = 0;
2279                 else
2280                         ssid_len = ssid[1];
2281
2282                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2283                                          ssid + 2, ssid_len, NULL,
2284                                          0, (u32) -1, true, 0,
2285                                          ifmgd->associated->channel, false);
2286                 rcu_read_unlock();
2287         }
2288
2289         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2290         run_again(sdata, ifmgd->probe_timeout);
2291 }
2292
2293 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2294                                    bool beacon)
2295 {
2296         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2297         bool already = false;
2298
2299         if (!ieee80211_sdata_running(sdata))
2300                 return;
2301
2302         sdata_lock(sdata);
2303
2304         if (!ifmgd->associated)
2305                 goto out;
2306
2307         mutex_lock(&sdata->local->mtx);
2308
2309         if (sdata->local->tmp_channel || sdata->local->scanning) {
2310                 mutex_unlock(&sdata->local->mtx);
2311                 goto out;
2312         }
2313
2314         if (beacon) {
2315                 mlme_dbg_ratelimited(sdata,
2316                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2317                                      beacon_loss_count);
2318
2319                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2320         }
2321
2322         /*
2323          * The driver/our work has already reported this event or the
2324          * connection monitoring has kicked in and we have already sent
2325          * a probe request. Or maybe the AP died and the driver keeps
2326          * reporting until we disassociate...
2327          *
2328          * In either case we have to ignore the current call to this
2329          * function (except for setting the correct probe reason bit)
2330          * because otherwise we would reset the timer every time and
2331          * never check whether we received a probe response!
2332          */
2333         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2334                 already = true;
2335
2336         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2337
2338         mutex_unlock(&sdata->local->mtx);
2339
2340         if (already)
2341                 goto out;
2342
2343         mutex_lock(&sdata->local->iflist_mtx);
2344         ieee80211_recalc_ps(sdata->local, -1);
2345         mutex_unlock(&sdata->local->iflist_mtx);
2346
2347         ifmgd->probe_send_count = 0;
2348         ieee80211_mgd_probe_ap_send(sdata);
2349  out:
2350         sdata_unlock(sdata);
2351 }
2352
2353 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2354                                           struct ieee80211_vif *vif)
2355 {
2356         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2357         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2358         struct cfg80211_bss *cbss;
2359         struct sk_buff *skb;
2360         const u8 *ssid;
2361         int ssid_len;
2362
2363         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2364                 return NULL;
2365
2366         sdata_assert_lock(sdata);
2367
2368         if (ifmgd->associated)
2369                 cbss = ifmgd->associated;
2370         else if (ifmgd->auth_data)
2371                 cbss = ifmgd->auth_data->bss;
2372         else if (ifmgd->assoc_data)
2373                 cbss = ifmgd->assoc_data->bss;
2374         else
2375                 return NULL;
2376
2377         rcu_read_lock();
2378         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2379         if (WARN_ON_ONCE(ssid == NULL))
2380                 ssid_len = 0;
2381         else
2382                 ssid_len = ssid[1];
2383
2384         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2385                                         (u32) -1, cbss->channel,
2386                                         ssid + 2, ssid_len,
2387                                         NULL, 0, true);
2388         rcu_read_unlock();
2389
2390         return skb;
2391 }
2392 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2393
2394 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2395                                         const u8 *buf, size_t len, bool tx,
2396                                         u16 reason)
2397 {
2398         struct ieee80211_event event = {
2399                 .type = MLME_EVENT,
2400                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2401                 .u.mlme.reason = reason,
2402         };
2403
2404         if (tx)
2405                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2406         else
2407                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2408
2409         drv_event_callback(sdata->local, sdata, &event);
2410 }
2411
2412 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2413 {
2414         struct ieee80211_local *local = sdata->local;
2415         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2416         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2417
2418         sdata_lock(sdata);
2419         if (!ifmgd->associated) {
2420                 sdata_unlock(sdata);
2421                 return;
2422         }
2423
2424         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2425                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2426                                true, frame_buf);
2427         mutex_lock(&local->mtx);
2428         sdata->vif.csa_active = false;
2429         ifmgd->csa_waiting_bcn = false;
2430         if (sdata->csa_block_tx) {
2431                 ieee80211_wake_vif_queues(local, sdata,
2432                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2433                 sdata->csa_block_tx = false;
2434         }
2435         mutex_unlock(&local->mtx);
2436
2437         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2438                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2439
2440         sdata_unlock(sdata);
2441 }
2442
2443 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2444 {
2445         struct ieee80211_sub_if_data *sdata =
2446                 container_of(work, struct ieee80211_sub_if_data,
2447                              u.mgd.beacon_connection_loss_work);
2448         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2449         struct sta_info *sta;
2450
2451         if (ifmgd->associated) {
2452                 rcu_read_lock();
2453                 sta = sta_info_get(sdata, ifmgd->bssid);
2454                 if (sta)
2455                         sta->beacon_loss_count++;
2456                 rcu_read_unlock();
2457         }
2458
2459         if (ifmgd->connection_loss) {
2460                 sdata_info(sdata, "Connection to AP %pM lost\n",
2461                            ifmgd->bssid);
2462                 __ieee80211_disconnect(sdata);
2463         } else {
2464                 ieee80211_mgd_probe_ap(sdata, true);
2465         }
2466 }
2467
2468 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2469 {
2470         struct ieee80211_sub_if_data *sdata =
2471                 container_of(work, struct ieee80211_sub_if_data,
2472                              u.mgd.csa_connection_drop_work);
2473
2474         __ieee80211_disconnect(sdata);
2475 }
2476
2477 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2478 {
2479         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2480         struct ieee80211_hw *hw = &sdata->local->hw;
2481
2482         trace_api_beacon_loss(sdata);
2483
2484         sdata->u.mgd.connection_loss = false;
2485         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2486 }
2487 EXPORT_SYMBOL(ieee80211_beacon_loss);
2488
2489 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2490 {
2491         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2492         struct ieee80211_hw *hw = &sdata->local->hw;
2493
2494         trace_api_connection_loss(sdata);
2495
2496         sdata->u.mgd.connection_loss = true;
2497         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2498 }
2499 EXPORT_SYMBOL(ieee80211_connection_loss);
2500
2501
2502 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2503                                         bool assoc)
2504 {
2505         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2506
2507         sdata_assert_lock(sdata);
2508
2509         if (!assoc) {
2510                 /*
2511                  * we are not authenticated yet, the only timer that could be
2512                  * running is the timeout for the authentication response which
2513                  * which is not relevant anymore.
2514                  */
2515                 del_timer_sync(&sdata->u.mgd.timer);
2516                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2517
2518                 eth_zero_addr(sdata->u.mgd.bssid);
2519                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2520                 sdata->u.mgd.flags = 0;
2521                 mutex_lock(&sdata->local->mtx);
2522                 ieee80211_vif_release_channel(sdata);
2523                 mutex_unlock(&sdata->local->mtx);
2524         }
2525
2526         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2527         kfree(auth_data);
2528         sdata->u.mgd.auth_data = NULL;
2529 }
2530
2531 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2532                                          bool assoc)
2533 {
2534         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2535
2536         sdata_assert_lock(sdata);
2537
2538         if (!assoc) {
2539                 /*
2540                  * we are not associated yet, the only timer that could be
2541                  * running is the timeout for the association response which
2542                  * which is not relevant anymore.
2543                  */
2544                 del_timer_sync(&sdata->u.mgd.timer);
2545                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2546
2547                 eth_zero_addr(sdata->u.mgd.bssid);
2548                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2549                 sdata->u.mgd.flags = 0;
2550                 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2551                 mutex_lock(&sdata->local->mtx);
2552                 ieee80211_vif_release_channel(sdata);
2553                 mutex_unlock(&sdata->local->mtx);
2554         }
2555
2556         kfree(assoc_data);
2557         sdata->u.mgd.assoc_data = NULL;
2558 }
2559
2560 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2561                                      struct ieee80211_mgmt *mgmt, size_t len)
2562 {
2563         struct ieee80211_local *local = sdata->local;
2564         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2565         u8 *pos;
2566         struct ieee802_11_elems elems;
2567         u32 tx_flags = 0;
2568
2569         pos = mgmt->u.auth.variable;
2570         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2571         if (!elems.challenge)
2572                 return;
2573         auth_data->expected_transaction = 4;
2574         drv_mgd_prepare_tx(sdata->local, sdata);
2575         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2576                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2577                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2578         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2579                             elems.challenge - 2, elems.challenge_len + 2,
2580                             auth_data->bss->bssid, auth_data->bss->bssid,
2581                             auth_data->key, auth_data->key_len,
2582                             auth_data->key_idx, tx_flags);
2583 }
2584
2585 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2586                                    struct ieee80211_mgmt *mgmt, size_t len)
2587 {
2588         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2589         u8 bssid[ETH_ALEN];
2590         u16 auth_alg, auth_transaction, status_code;
2591         struct sta_info *sta;
2592         struct ieee80211_event event = {
2593                 .type = MLME_EVENT,
2594                 .u.mlme.data = AUTH_EVENT,
2595         };
2596
2597         sdata_assert_lock(sdata);
2598
2599         if (len < 24 + 6)
2600                 return;
2601
2602         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2603                 return;
2604
2605         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2606
2607         if (!ether_addr_equal(bssid, mgmt->bssid))
2608                 return;
2609
2610         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2611         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2612         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2613
2614         if (auth_alg != ifmgd->auth_data->algorithm ||
2615             auth_transaction != ifmgd->auth_data->expected_transaction) {
2616                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2617                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2618                            auth_transaction,
2619                            ifmgd->auth_data->expected_transaction);
2620                 return;
2621         }
2622
2623         if (status_code != WLAN_STATUS_SUCCESS) {
2624                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2625                            mgmt->sa, status_code);
2626                 ieee80211_destroy_auth_data(sdata, false);
2627                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2628                 event.u.mlme.status = MLME_DENIED;
2629                 event.u.mlme.reason = status_code;
2630                 drv_event_callback(sdata->local, sdata, &event);
2631                 return;
2632         }
2633
2634         switch (ifmgd->auth_data->algorithm) {
2635         case WLAN_AUTH_OPEN:
2636         case WLAN_AUTH_LEAP:
2637         case WLAN_AUTH_FT:
2638         case WLAN_AUTH_SAE:
2639                 break;
2640         case WLAN_AUTH_SHARED_KEY:
2641                 if (ifmgd->auth_data->expected_transaction != 4) {
2642                         ieee80211_auth_challenge(sdata, mgmt, len);
2643                         /* need another frame */
2644                         return;
2645                 }
2646                 break;
2647         default:
2648                 WARN_ONCE(1, "invalid auth alg %d",
2649                           ifmgd->auth_data->algorithm);
2650                 return;
2651         }
2652
2653         event.u.mlme.status = MLME_SUCCESS;
2654         drv_event_callback(sdata->local, sdata, &event);
2655         sdata_info(sdata, "authenticated\n");
2656         ifmgd->auth_data->done = true;
2657         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2658         ifmgd->auth_data->timeout_started = true;
2659         run_again(sdata, ifmgd->auth_data->timeout);
2660
2661         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2662             ifmgd->auth_data->expected_transaction != 2) {
2663                 /*
2664                  * Report auth frame to user space for processing since another
2665                  * round of Authentication frames is still needed.
2666                  */
2667                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2668                 return;
2669         }
2670
2671         /* move station state to auth */
2672         mutex_lock(&sdata->local->sta_mtx);
2673         sta = sta_info_get(sdata, bssid);
2674         if (!sta) {
2675                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2676                 goto out_err;
2677         }
2678         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2679                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2680                 goto out_err;
2681         }
2682         mutex_unlock(&sdata->local->sta_mtx);
2683
2684         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2685         return;
2686  out_err:
2687         mutex_unlock(&sdata->local->sta_mtx);
2688         /* ignore frame -- wait for timeout */
2689 }
2690
2691 #define case_WLAN(type) \
2692         case WLAN_REASON_##type: return #type
2693
2694 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2695 {
2696         switch (reason_code) {
2697         case_WLAN(UNSPECIFIED);
2698         case_WLAN(PREV_AUTH_NOT_VALID);
2699         case_WLAN(DEAUTH_LEAVING);
2700         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2701         case_WLAN(DISASSOC_AP_BUSY);
2702         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2703         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2704         case_WLAN(DISASSOC_STA_HAS_LEFT);
2705         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2706         case_WLAN(DISASSOC_BAD_POWER);
2707         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2708         case_WLAN(INVALID_IE);
2709         case_WLAN(MIC_FAILURE);
2710         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2711         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2712         case_WLAN(IE_DIFFERENT);
2713         case_WLAN(INVALID_GROUP_CIPHER);
2714         case_WLAN(INVALID_PAIRWISE_CIPHER);
2715         case_WLAN(INVALID_AKMP);
2716         case_WLAN(UNSUPP_RSN_VERSION);
2717         case_WLAN(INVALID_RSN_IE_CAP);
2718         case_WLAN(IEEE8021X_FAILED);
2719         case_WLAN(CIPHER_SUITE_REJECTED);
2720         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2721         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2722         case_WLAN(DISASSOC_LOW_ACK);
2723         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2724         case_WLAN(QSTA_LEAVE_QBSS);
2725         case_WLAN(QSTA_NOT_USE);
2726         case_WLAN(QSTA_REQUIRE_SETUP);
2727         case_WLAN(QSTA_TIMEOUT);
2728         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2729         case_WLAN(MESH_PEER_CANCELED);
2730         case_WLAN(MESH_MAX_PEERS);
2731         case_WLAN(MESH_CONFIG);
2732         case_WLAN(MESH_CLOSE);
2733         case_WLAN(MESH_MAX_RETRIES);
2734         case_WLAN(MESH_CONFIRM_TIMEOUT);
2735         case_WLAN(MESH_INVALID_GTK);
2736         case_WLAN(MESH_INCONSISTENT_PARAM);
2737         case_WLAN(MESH_INVALID_SECURITY);
2738         case_WLAN(MESH_PATH_ERROR);
2739         case_WLAN(MESH_PATH_NOFORWARD);
2740         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2741         case_WLAN(MAC_EXISTS_IN_MBSS);
2742         case_WLAN(MESH_CHAN_REGULATORY);
2743         case_WLAN(MESH_CHAN);
2744         default: return "<unknown>";
2745         }
2746 }
2747
2748 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2749                                      struct ieee80211_mgmt *mgmt, size_t len)
2750 {
2751         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2752         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2753
2754         sdata_assert_lock(sdata);
2755
2756         if (len < 24 + 2)
2757                 return;
2758
2759         if (ifmgd->associated &&
2760             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2761                 const u8 *bssid = ifmgd->associated->bssid;
2762
2763                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2764                            bssid, reason_code,
2765                            ieee80211_get_reason_code_string(reason_code));
2766
2767                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2768
2769                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2770                                             reason_code);
2771                 return;
2772         }
2773
2774         if (ifmgd->assoc_data &&
2775             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2776                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2777
2778                 sdata_info(sdata,
2779                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2780                            bssid, reason_code,
2781                            ieee80211_get_reason_code_string(reason_code));
2782
2783                 ieee80211_destroy_assoc_data(sdata, false);
2784
2785                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2786                 return;
2787         }
2788 }
2789
2790
2791 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2792                                        struct ieee80211_mgmt *mgmt, size_t len)
2793 {
2794         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2795         u16 reason_code;
2796
2797         sdata_assert_lock(sdata);
2798
2799         if (len < 24 + 2)
2800                 return;
2801
2802         if (!ifmgd->associated ||
2803             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2804                 return;
2805
2806         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2807
2808         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2809                    mgmt->sa, reason_code);
2810
2811         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2812
2813         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2814 }
2815
2816 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2817                                 u8 *supp_rates, unsigned int supp_rates_len,
2818                                 u32 *rates, u32 *basic_rates,
2819                                 bool *have_higher_than_11mbit,
2820                                 int *min_rate, int *min_rate_index,
2821                                 int shift, u32 rate_flags)
2822 {
2823         int i, j;
2824
2825         for (i = 0; i < supp_rates_len; i++) {
2826                 int rate = supp_rates[i] & 0x7f;
2827                 bool is_basic = !!(supp_rates[i] & 0x80);
2828
2829                 if ((rate * 5 * (1 << shift)) > 110)
2830                         *have_higher_than_11mbit = true;
2831
2832                 /*
2833                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2834                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2835                  *
2836                  * Note: Even through the membership selector and the basic
2837                  *       rate flag share the same bit, they are not exactly
2838                  *       the same.
2839                  */
2840                 if (!!(supp_rates[i] & 0x80) &&
2841                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2842                         continue;
2843
2844                 for (j = 0; j < sband->n_bitrates; j++) {
2845                         struct ieee80211_rate *br;
2846                         int brate;
2847
2848                         br = &sband->bitrates[j];
2849                         if ((rate_flags & br->flags) != rate_flags)
2850                                 continue;
2851
2852                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2853                         if (brate == rate) {
2854                                 *rates |= BIT(j);
2855                                 if (is_basic)
2856                                         *basic_rates |= BIT(j);
2857                                 if ((rate * 5) < *min_rate) {
2858                                         *min_rate = rate * 5;
2859                                         *min_rate_index = j;
2860                                 }
2861                                 break;
2862                         }
2863                 }
2864         }
2865 }
2866
2867 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2868                                     struct cfg80211_bss *cbss,
2869                                     struct ieee80211_mgmt *mgmt, size_t len)
2870 {
2871         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2872         struct ieee80211_local *local = sdata->local;
2873         struct ieee80211_supported_band *sband;
2874         struct sta_info *sta;
2875         u8 *pos;
2876         u16 capab_info, aid;
2877         struct ieee802_11_elems elems;
2878         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2879         const struct cfg80211_bss_ies *bss_ies = NULL;
2880         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2881         u32 changed = 0;
2882         int err;
2883         bool ret;
2884
2885         /* AssocResp and ReassocResp have identical structure */
2886
2887         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2888         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2889
2890         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2891                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2892                            aid);
2893         aid &= ~(BIT(15) | BIT(14));
2894
2895         ifmgd->broken_ap = false;
2896
2897         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2898                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2899                            aid);
2900                 aid = 0;
2901                 ifmgd->broken_ap = true;
2902         }
2903
2904         pos = mgmt->u.assoc_resp.variable;
2905         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2906
2907         if (!elems.supp_rates) {
2908                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2909                 return false;
2910         }
2911
2912         ifmgd->aid = aid;
2913         ifmgd->tdls_chan_switch_prohibited =
2914                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2915                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2916
2917         /*
2918          * Some APs are erroneously not including some information in their
2919          * (re)association response frames. Try to recover by using the data
2920          * from the beacon or probe response. This seems to afflict mobile
2921          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2922          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2923          */
2924         if ((assoc_data->wmm && !elems.wmm_param) ||
2925             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2926              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2927             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2928              (!elems.vht_cap_elem || !elems.vht_operation))) {
2929                 const struct cfg80211_bss_ies *ies;
2930                 struct ieee802_11_elems bss_elems;
2931
2932                 rcu_read_lock();
2933                 ies = rcu_dereference(cbss->ies);
2934                 if (ies)
2935                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2936                                           GFP_ATOMIC);
2937                 rcu_read_unlock();
2938                 if (!bss_ies)
2939                         return false;
2940
2941                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2942                                        false, &bss_elems);
2943                 if (assoc_data->wmm &&
2944                     !elems.wmm_param && bss_elems.wmm_param) {
2945                         elems.wmm_param = bss_elems.wmm_param;
2946                         sdata_info(sdata,
2947                                    "AP bug: WMM param missing from AssocResp\n");
2948                 }
2949
2950                 /*
2951                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2952                  * have to include the IEs in the (re)association response.
2953                  */
2954                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2955                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2956                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2957                         sdata_info(sdata,
2958                                    "AP bug: HT capability missing from AssocResp\n");
2959                 }
2960                 if (!elems.ht_operation && bss_elems.ht_operation &&
2961                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2962                         elems.ht_operation = bss_elems.ht_operation;
2963                         sdata_info(sdata,
2964                                    "AP bug: HT operation missing from AssocResp\n");
2965                 }
2966                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2967                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2968                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2969                         sdata_info(sdata,
2970                                    "AP bug: VHT capa missing from AssocResp\n");
2971                 }
2972                 if (!elems.vht_operation && bss_elems.vht_operation &&
2973                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2974                         elems.vht_operation = bss_elems.vht_operation;
2975                         sdata_info(sdata,
2976                                    "AP bug: VHT operation missing from AssocResp\n");
2977                 }
2978         }
2979
2980         /*
2981          * We previously checked these in the beacon/probe response, so
2982          * they should be present here. This is just a safety net.
2983          */
2984         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2985             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2986                 sdata_info(sdata,
2987                            "HT AP is missing WMM params or HT capability/operation\n");
2988                 ret = false;
2989                 goto out;
2990         }
2991
2992         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2993             (!elems.vht_cap_elem || !elems.vht_operation)) {
2994                 sdata_info(sdata,
2995                            "VHT AP is missing VHT capability/operation\n");
2996                 ret = false;
2997                 goto out;
2998         }
2999
3000         mutex_lock(&sdata->local->sta_mtx);
3001         /*
3002          * station info was already allocated and inserted before
3003          * the association and should be available to us
3004          */
3005         sta = sta_info_get(sdata, cbss->bssid);
3006         if (WARN_ON(!sta)) {
3007                 mutex_unlock(&sdata->local->sta_mtx);
3008                 ret = false;
3009                 goto out;
3010         }
3011
3012         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3013
3014         /* Set up internal HT/VHT capabilities */
3015         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3016                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3017                                                   elems.ht_cap_elem, sta);
3018
3019         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3020                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3021                                                     elems.vht_cap_elem, sta);
3022
3023         /*
3024          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3025          * in their association response, so ignore that data for our own
3026          * configuration. If it changed since the last beacon, we'll get the
3027          * next beacon and update then.
3028          */
3029
3030         /*
3031          * If an operating mode notification IE is present, override the
3032          * NSS calculation (that would be done in rate_control_rate_init())
3033          * and use the # of streams from that element.
3034          */
3035         if (elems.opmode_notif &&
3036             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3037                 u8 nss;
3038
3039                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3040                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3041                 nss += 1;
3042                 sta->sta.rx_nss = nss;
3043         }
3044
3045         rate_control_rate_init(sta);
3046
3047         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
3048                 set_sta_flag(sta, WLAN_STA_MFP);
3049
3050         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3051
3052         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3053         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3054                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3055         if (err) {
3056                 sdata_info(sdata,
3057                            "failed to move station %pM to desired state\n",
3058                            sta->sta.addr);
3059                 WARN_ON(__sta_info_destroy(sta));
3060                 mutex_unlock(&sdata->local->sta_mtx);
3061                 ret = false;
3062                 goto out;
3063         }
3064
3065         mutex_unlock(&sdata->local->sta_mtx);
3066
3067         /*
3068          * Always handle WMM once after association regardless
3069          * of the first value the AP uses. Setting -1 here has
3070          * that effect because the AP values is an unsigned
3071          * 4-bit value.
3072          */
3073         ifmgd->wmm_last_param_set = -1;
3074
3075         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3076                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3077                                          elems.wmm_param_len);
3078         else
3079                 ieee80211_set_wmm_default(sdata, false);
3080         changed |= BSS_CHANGED_QOS;
3081
3082         /* set AID and assoc capability,
3083          * ieee80211_set_associated() will tell the driver */
3084         bss_conf->aid = aid;
3085         bss_conf->assoc_capability = capab_info;
3086         ieee80211_set_associated(sdata, cbss, changed);
3087
3088         /*
3089          * If we're using 4-addr mode, let the AP know that we're
3090          * doing so, so that it can create the STA VLAN on its side
3091          */
3092         if (ifmgd->use_4addr)
3093                 ieee80211_send_4addr_nullfunc(local, sdata);
3094
3095         /*
3096          * Start timer to probe the connection to the AP now.
3097          * Also start the timer that will detect beacon loss.
3098          */
3099         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3100         ieee80211_sta_reset_beacon_monitor(sdata);
3101
3102         ret = true;
3103  out:
3104         kfree(bss_ies);
3105         return ret;
3106 }
3107
3108 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3109                                          struct ieee80211_mgmt *mgmt,
3110                                          size_t len)
3111 {
3112         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3113         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3114         u16 capab_info, status_code, aid;
3115         struct ieee802_11_elems elems;
3116         int ac, uapsd_queues = -1;
3117         u8 *pos;
3118         bool reassoc;
3119         struct cfg80211_bss *bss;
3120         struct ieee80211_event event = {
3121                 .type = MLME_EVENT,
3122                 .u.mlme.data = ASSOC_EVENT,
3123         };
3124
3125         sdata_assert_lock(sdata);
3126
3127         if (!assoc_data)
3128                 return;
3129         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3130                 return;
3131
3132         /*
3133          * AssocResp and ReassocResp have identical structure, so process both
3134          * of them in this function.
3135          */
3136
3137         if (len < 24 + 6)
3138                 return;
3139
3140         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3141         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3142         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3143         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3144
3145         sdata_info(sdata,
3146                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3147                    reassoc ? "Rea" : "A", mgmt->sa,
3148                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3149
3150         pos = mgmt->u.assoc_resp.variable;
3151         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3152
3153         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3154             elems.timeout_int &&
3155             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3156                 u32 tu, ms;
3157                 tu = le32_to_cpu(elems.timeout_int->value);
3158                 ms = tu * 1024 / 1000;
3159                 sdata_info(sdata,
3160                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3161                            mgmt->sa, tu, ms);
3162                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3163                 assoc_data->timeout_started = true;
3164                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3165                         run_again(sdata, assoc_data->timeout);
3166                 return;
3167         }
3168
3169         bss = assoc_data->bss;
3170
3171         if (status_code != WLAN_STATUS_SUCCESS) {
3172                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3173                            mgmt->sa, status_code);
3174                 ieee80211_destroy_assoc_data(sdata, false);
3175                 event.u.mlme.status = MLME_DENIED;
3176                 event.u.mlme.reason = status_code;
3177                 drv_event_callback(sdata->local, sdata, &event);
3178         } else {
3179                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3180                         /* oops -- internal error -- send timeout for now */
3181                         ieee80211_destroy_assoc_data(sdata, false);
3182                         cfg80211_assoc_timeout(sdata->dev, bss);
3183                         return;
3184                 }
3185                 event.u.mlme.status = MLME_SUCCESS;
3186                 drv_event_callback(sdata->local, sdata, &event);
3187                 sdata_info(sdata, "associated\n");
3188
3189                 /*
3190                  * destroy assoc_data afterwards, as otherwise an idle
3191                  * recalc after assoc_data is NULL but before associated
3192                  * is set can cause the interface to go idle
3193                  */
3194                 ieee80211_destroy_assoc_data(sdata, true);
3195
3196                 /* get uapsd queues configuration */
3197                 uapsd_queues = 0;
3198                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3199                         if (sdata->tx_conf[ac].uapsd)
3200                                 uapsd_queues |= BIT(ac);
3201         }
3202
3203         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3204 }
3205
3206 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3207                                   struct ieee80211_mgmt *mgmt, size_t len,
3208                                   struct ieee80211_rx_status *rx_status,
3209                                   struct ieee802_11_elems *elems)
3210 {
3211         struct ieee80211_local *local = sdata->local;
3212         struct ieee80211_bss *bss;
3213         struct ieee80211_channel *channel;
3214
3215         sdata_assert_lock(sdata);
3216
3217         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3218         if (!channel)
3219                 return;
3220
3221         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3222                                         channel);
3223         if (bss) {
3224                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3225                 ieee80211_rx_bss_put(local, bss);
3226         }
3227 }
3228
3229
3230 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3231                                          struct sk_buff *skb)
3232 {
3233         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3234         struct ieee80211_if_managed *ifmgd;
3235         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3236         size_t baselen, len = skb->len;
3237         struct ieee802_11_elems elems;
3238
3239         ifmgd = &sdata->u.mgd;
3240
3241         sdata_assert_lock(sdata);
3242
3243         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3244                 return; /* ignore ProbeResp to foreign address */
3245
3246         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3247         if (baselen > len)
3248                 return;
3249
3250         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3251                                false, &elems);
3252
3253         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3254
3255         if (ifmgd->associated &&
3256             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3257                 ieee80211_reset_ap_probe(sdata);
3258 }
3259
3260 /*
3261  * This is the canonical list of information elements we care about,
3262  * the filter code also gives us all changes to the Microsoft OUI
3263  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3264  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3265  * changes to requested client power.
3266  *
3267  * We implement beacon filtering in software since that means we can
3268  * avoid processing the frame here and in cfg80211, and userspace
3269  * will not be able to tell whether the hardware supports it or not.
3270  *
3271  * XXX: This list needs to be dynamic -- userspace needs to be able to
3272  *      add items it requires. It also needs to be able to tell us to
3273  *      look out for other vendor IEs.
3274  */
3275 static const u64 care_about_ies =
3276         (1ULL << WLAN_EID_COUNTRY) |
3277         (1ULL << WLAN_EID_ERP_INFO) |
3278         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3279         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3280         (1ULL << WLAN_EID_HT_CAPABILITY) |
3281         (1ULL << WLAN_EID_HT_OPERATION) |
3282         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3283
3284 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3285                                      struct ieee80211_mgmt *mgmt, size_t len,
3286                                      struct ieee80211_rx_status *rx_status)
3287 {
3288         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3289         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3290         size_t baselen;
3291         struct ieee802_11_elems elems;
3292         struct ieee80211_local *local = sdata->local;
3293         struct ieee80211_chanctx_conf *chanctx_conf;
3294         struct ieee80211_channel *chan;
3295         struct sta_info *sta;
3296         u32 changed = 0;
3297         bool erp_valid;
3298         u8 erp_value = 0;
3299         u32 ncrc;
3300         u8 *bssid;
3301         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3302
3303         sdata_assert_lock(sdata);
3304
3305         /* Process beacon from the current BSS */
3306         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3307         if (baselen > len)
3308                 return;
3309
3310         rcu_read_lock();
3311         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3312         if (!chanctx_conf) {
3313                 rcu_read_unlock();
3314                 return;
3315         }
3316
3317         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3318                 rcu_read_unlock();
3319                 return;
3320         }
3321         chan = chanctx_conf->def.chan;
3322         rcu_read_unlock();
3323
3324         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3325             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3326                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3327                                        len - baselen, false, &elems);
3328
3329                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3330                 if (elems.tim && !elems.parse_error) {
3331                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3332                         ifmgd->dtim_period = tim_ie->dtim_period;
3333                 }
3334                 ifmgd->have_beacon = true;
3335                 ifmgd->assoc_data->need_beacon = false;
3336                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3337                         sdata->vif.bss_conf.sync_tsf =
3338                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3339                         sdata->vif.bss_conf.sync_device_ts =
3340                                 rx_status->device_timestamp;
3341                         if (elems.tim)
3342                                 sdata->vif.bss_conf.sync_dtim_count =
3343                                         elems.tim->dtim_count;
3344                         else
3345                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3346                 }
3347                 /* continue assoc process */
3348                 ifmgd->assoc_data->timeout = jiffies;
3349                 ifmgd->assoc_data->timeout_started = true;
3350                 run_again(sdata, ifmgd->assoc_data->timeout);
3351                 return;
3352         }
3353
3354         if (!ifmgd->associated ||
3355             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3356                 return;
3357         bssid = ifmgd->associated->bssid;
3358
3359         /* Track average RSSI from the Beacon frames of the current AP */
3360         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3361                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3362                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3363                 ifmgd->last_cqm_event_signal = 0;
3364                 ifmgd->count_beacon_signal = 1;
3365                 ifmgd->last_ave_beacon_signal = 0;
3366         } else {
3367                 ifmgd->count_beacon_signal++;
3368         }
3369
3370         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3371
3372         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3373             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3374                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3375                 int last_sig = ifmgd->last_ave_beacon_signal;
3376                 struct ieee80211_event event = {
3377                         .type = RSSI_EVENT,
3378                 };
3379
3380                 /*
3381                  * if signal crosses either of the boundaries, invoke callback
3382                  * with appropriate parameters
3383                  */
3384                 if (sig > ifmgd->rssi_max_thold &&
3385                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3386                         ifmgd->last_ave_beacon_signal = sig;
3387                         event.u.rssi.data = RSSI_EVENT_HIGH;
3388                         drv_event_callback(local, sdata, &event);
3389                 } else if (sig < ifmgd->rssi_min_thold &&
3390                            (last_sig >= ifmgd->rssi_max_thold ||
3391                            last_sig == 0)) {
3392                         ifmgd->last_ave_beacon_signal = sig;
3393                         event.u.rssi.data = RSSI_EVENT_LOW;
3394                         drv_event_callback(local, sdata, &event);
3395                 }
3396         }
3397
3398         if (bss_conf->cqm_rssi_thold &&
3399             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3400             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3401                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3402                 int last_event = ifmgd->last_cqm_event_signal;
3403                 int thold = bss_conf->cqm_rssi_thold;
3404                 int hyst = bss_conf->cqm_rssi_hyst;
3405
3406                 if (sig < thold &&
3407                     (last_event == 0 || sig < last_event - hyst)) {
3408                         ifmgd->last_cqm_event_signal = sig;
3409                         ieee80211_cqm_rssi_notify(
3410                                 &sdata->vif,
3411                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3412                                 GFP_KERNEL);
3413                 } else if (sig > thold &&
3414                            (last_event == 0 || sig > last_event + hyst)) {
3415                         ifmgd->last_cqm_event_signal = sig;
3416                         ieee80211_cqm_rssi_notify(
3417                                 &sdata->vif,
3418                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3419                                 GFP_KERNEL);
3420                 }
3421         }
3422
3423         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3424                 mlme_dbg_ratelimited(sdata,
3425                                      "cancelling AP probe due to a received beacon\n");
3426                 ieee80211_reset_ap_probe(sdata);
3427         }
3428
3429         /*
3430          * Push the beacon loss detection into the future since
3431          * we are processing a beacon from the AP just now.
3432          */
3433         ieee80211_sta_reset_beacon_monitor(sdata);
3434
3435         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3436         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3437                                           len - baselen, false, &elems,
3438                                           care_about_ies, ncrc);
3439
3440         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3441             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3442                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3443                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3444                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3445                                 ieee80211_hw_config(local,
3446                                                     IEEE80211_CONF_CHANGE_PS);
3447                         }
3448                         ieee80211_send_nullfunc(local, sdata, false);
3449                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3450                         local->pspolling = true;
3451
3452                         /*
3453                          * Here is assumed that the driver will be
3454                          * able to send ps-poll frame and receive a
3455                          * response even though power save mode is
3456                          * enabled, but some drivers might require
3457                          * to disable power save here. This needs
3458                          * to be investigated.
3459                          */
3460                         ieee80211_send_pspoll(local, sdata);
3461                 }
3462         }
3463
3464         if (sdata->vif.p2p) {
3465                 struct ieee80211_p2p_noa_attr noa = {};
3466                 int ret;
3467
3468                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3469                                             len - baselen,
3470                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3471                                             (u8 *) &noa, sizeof(noa));
3472                 if (ret >= 2) {
3473                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3474                                 /* valid noa_attr and index changed */
3475                                 sdata->u.mgd.p2p_noa_index = noa.index;
3476                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3477                                 changed |= BSS_CHANGED_P2P_PS;
3478                                 /*
3479                                  * make sure we update all information, the CRC
3480                                  * mechanism doesn't look at P2P attributes.
3481                                  */
3482                                 ifmgd->beacon_crc_valid = false;
3483                         }
3484                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3485                         /* noa_attr not found and we had valid noa_attr before */
3486                         sdata->u.mgd.p2p_noa_index = -1;
3487                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3488                         changed |= BSS_CHANGED_P2P_PS;
3489                         ifmgd->beacon_crc_valid = false;
3490                 }
3491         }
3492
3493         if (ifmgd->csa_waiting_bcn)
3494                 ieee80211_chswitch_post_beacon(sdata);
3495
3496         /*
3497          * Update beacon timing and dtim count on every beacon appearance. This
3498          * will allow the driver to use the most updated values. Do it before
3499          * comparing this one with last received beacon.
3500          * IMPORTANT: These parameters would possibly be out of sync by the time
3501          * the driver will use them. The synchronized view is currently
3502          * guaranteed only in certain callbacks.
3503          */
3504         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3505                 sdata->vif.bss_conf.sync_tsf =
3506                         le64_to_cpu(mgmt->u.beacon.timestamp);
3507                 sdata->vif.bss_conf.sync_device_ts =
3508                         rx_status->device_timestamp;
3509                 if (elems.tim)
3510                         sdata->vif.bss_conf.sync_dtim_count =
3511                                 elems.tim->dtim_count;
3512                 else
3513                         sdata->vif.bss_conf.sync_dtim_count = 0;
3514         }
3515
3516         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3517                 return;
3518         ifmgd->beacon_crc = ncrc;
3519         ifmgd->beacon_crc_valid = true;
3520
3521         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3522
3523         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3524                                          rx_status->device_timestamp,
3525                                          &elems, true);
3526
3527         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3528             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3529                                      elems.wmm_param_len))
3530                 changed |= BSS_CHANGED_QOS;
3531
3532         /*
3533          * If we haven't had a beacon before, tell the driver about the
3534          * DTIM period (and beacon timing if desired) now.
3535          */
3536         if (!ifmgd->have_beacon) {
3537                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3538                 if (elems.tim)
3539                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3540                 else
3541                         bss_conf->dtim_period = 1;
3542
3543                 changed |= BSS_CHANGED_BEACON_INFO;
3544                 ifmgd->have_beacon = true;
3545
3546                 mutex_lock(&local->iflist_mtx);
3547                 ieee80211_recalc_ps(local, -1);
3548                 mutex_unlock(&local->iflist_mtx);
3549
3550                 ieee80211_recalc_ps_vif(sdata);
3551         }
3552
3553         if (elems.erp_info) {
3554                 erp_valid = true;
3555                 erp_value = elems.erp_info[0];
3556         } else {
3557                 erp_valid = false;
3558         }
3559         changed |= ieee80211_handle_bss_capability(sdata,
3560                         le16_to_cpu(mgmt->u.beacon.capab_info),
3561                         erp_valid, erp_value);
3562
3563         mutex_lock(&local->sta_mtx);
3564         sta = sta_info_get(sdata, bssid);
3565
3566         if (ieee80211_config_bw(sdata, sta,
3567                                 elems.ht_cap_elem, elems.ht_operation,
3568                                 elems.vht_operation, bssid, &changed)) {
3569                 mutex_unlock(&local->sta_mtx);
3570                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3571                                        WLAN_REASON_DEAUTH_LEAVING,
3572                                        true, deauth_buf);
3573                 ieee80211_report_disconnect(sdata, deauth_buf,
3574                                             sizeof(deauth_buf), true,
3575                                             WLAN_REASON_DEAUTH_LEAVING);
3576                 return;
3577         }
3578
3579         if (sta && elems.opmode_notif)
3580                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3581                                             rx_status->band, true);
3582         mutex_unlock(&local->sta_mtx);
3583
3584         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3585                                                elems.country_elem,
3586                                                elems.country_elem_len,
3587                                                elems.pwr_constr_elem,
3588                                                elems.cisco_dtpc_elem);
3589
3590         ieee80211_bss_info_change_notify(sdata, changed);
3591 }
3592
3593 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3594                                   struct sk_buff *skb)
3595 {
3596         struct ieee80211_rx_status *rx_status;
3597         struct ieee80211_mgmt *mgmt;
3598         u16 fc;
3599         struct ieee802_11_elems elems;
3600         int ies_len;
3601
3602         rx_status = (struct ieee80211_rx_status *) skb->cb;
3603         mgmt = (struct ieee80211_mgmt *) skb->data;
3604         fc = le16_to_cpu(mgmt->frame_control);
3605
3606         sdata_lock(sdata);
3607
3608         switch (fc & IEEE80211_FCTL_STYPE) {
3609         case IEEE80211_STYPE_BEACON:
3610                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3611                 break;
3612         case IEEE80211_STYPE_PROBE_RESP:
3613                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3614                 break;
3615         case IEEE80211_STYPE_AUTH:
3616                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3617                 break;
3618         case IEEE80211_STYPE_DEAUTH:
3619                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3620                 break;
3621         case IEEE80211_STYPE_DISASSOC:
3622                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3623                 break;
3624         case IEEE80211_STYPE_ASSOC_RESP:
3625         case IEEE80211_STYPE_REASSOC_RESP:
3626                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3627                 break;
3628         case IEEE80211_STYPE_ACTION:
3629                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3630                         ies_len = skb->len -
3631                                   offsetof(struct ieee80211_mgmt,
3632                                            u.action.u.chan_switch.variable);
3633
3634                         if (ies_len < 0)
3635                                 break;
3636
3637                         ieee802_11_parse_elems(
3638                                 mgmt->u.action.u.chan_switch.variable,
3639                                 ies_len, true, &elems);
3640
3641                         if (elems.parse_error)
3642                                 break;
3643
3644                         ieee80211_sta_process_chanswitch(sdata,
3645                                                  rx_status->mactime,
3646                                                  rx_status->device_timestamp,
3647                                                  &elems, false);
3648                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3649                         ies_len = skb->len -
3650                                   offsetof(struct ieee80211_mgmt,
3651                                            u.action.u.ext_chan_switch.variable);
3652
3653                         if (ies_len < 0)
3654                                 break;
3655
3656                         ieee802_11_parse_elems(
3657                                 mgmt->u.action.u.ext_chan_switch.variable,
3658                                 ies_len, true, &elems);
3659
3660                         if (elems.parse_error)
3661                                 break;
3662
3663                         /* for the handling code pretend this was also an IE */
3664                         elems.ext_chansw_ie =
3665                                 &mgmt->u.action.u.ext_chan_switch.data;
3666
3667                         ieee80211_sta_process_chanswitch(sdata,
3668                                                  rx_status->mactime,
3669                                                  rx_status->device_timestamp,
3670                                                  &elems, false);
3671                 }
3672                 break;
3673         }
3674         sdata_unlock(sdata);
3675 }
3676
3677 static void ieee80211_sta_timer(unsigned long data)
3678 {
3679         struct ieee80211_sub_if_data *sdata =
3680                 (struct ieee80211_sub_if_data *) data;
3681
3682         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3683 }
3684
3685 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3686                                           u8 *bssid, u8 reason, bool tx)
3687 {
3688         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3689
3690         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3691                                tx, frame_buf);
3692
3693         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3694                                     reason);
3695 }
3696
3697 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3698 {
3699         struct ieee80211_local *local = sdata->local;
3700         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3701         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3702         u32 tx_flags = 0;
3703         u16 trans = 1;
3704         u16 status = 0;
3705
3706         sdata_assert_lock(sdata);
3707
3708         if (WARN_ON_ONCE(!auth_data))
3709                 return -EINVAL;
3710
3711         auth_data->tries++;
3712
3713         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3714                 sdata_info(sdata, "authentication with %pM timed out\n",
3715                            auth_data->bss->bssid);
3716
3717                 /*
3718                  * Most likely AP is not in the range so remove the
3719                  * bss struct for that AP.
3720                  */
3721                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3722
3723                 return -ETIMEDOUT;
3724         }
3725
3726         drv_mgd_prepare_tx(local, sdata);
3727
3728         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3729                    auth_data->bss->bssid, auth_data->tries,
3730                    IEEE80211_AUTH_MAX_TRIES);
3731
3732         auth_data->expected_transaction = 2;
3733
3734         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3735                 trans = auth_data->sae_trans;
3736                 status = auth_data->sae_status;
3737                 auth_data->expected_transaction = trans;
3738         }
3739
3740         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3741                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3742                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3743
3744         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3745                             auth_data->data, auth_data->data_len,
3746                             auth_data->bss->bssid,
3747                             auth_data->bss->bssid, NULL, 0, 0,
3748                             tx_flags);
3749
3750         if (tx_flags == 0) {
3751                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3752                 auth_data->timeout_started = true;
3753                 run_again(sdata, auth_data->timeout);
3754         } else {
3755                 auth_data->timeout =
3756                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3757                 auth_data->timeout_started = true;
3758                 run_again(sdata, auth_data->timeout);
3759         }
3760
3761         return 0;
3762 }
3763
3764 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3765 {
3766         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3767         struct ieee80211_local *local = sdata->local;
3768
3769         sdata_assert_lock(sdata);
3770
3771         assoc_data->tries++;
3772         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3773                 sdata_info(sdata, "association with %pM timed out\n",
3774                            assoc_data->bss->bssid);
3775
3776                 /*
3777                  * Most likely AP is not in the range so remove the
3778                  * bss struct for that AP.
3779                  */
3780                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3781
3782                 return -ETIMEDOUT;
3783         }
3784
3785         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3786                    assoc_data->bss->bssid, assoc_data->tries,
3787                    IEEE80211_ASSOC_MAX_TRIES);
3788         ieee80211_send_assoc(sdata);
3789
3790         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3791                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3792                 assoc_data->timeout_started = true;
3793                 run_again(sdata, assoc_data->timeout);
3794         } else {
3795                 assoc_data->timeout =
3796                         round_jiffies_up(jiffies +
3797                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3798                 assoc_data->timeout_started = true;
3799                 run_again(sdata, assoc_data->timeout);
3800         }
3801
3802         return 0;
3803 }
3804
3805 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3806                                   __le16 fc, bool acked)
3807 {
3808         struct ieee80211_local *local = sdata->local;
3809
3810         sdata->u.mgd.status_fc = fc;
3811         sdata->u.mgd.status_acked = acked;
3812         sdata->u.mgd.status_received = true;
3813
3814         ieee80211_queue_work(&local->hw, &sdata->work);
3815 }
3816
3817 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3818 {
3819         struct ieee80211_local *local = sdata->local;
3820         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3821
3822         sdata_lock(sdata);
3823
3824         if (ifmgd->status_received) {
3825                 __le16 fc = ifmgd->status_fc;
3826                 bool status_acked = ifmgd->status_acked;
3827
3828                 ifmgd->status_received = false;
3829                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3830                         if (status_acked) {
3831                                 ifmgd->auth_data->timeout =
3832                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3833                                 run_again(sdata, ifmgd->auth_data->timeout);
3834                         } else {
3835                                 ifmgd->auth_data->timeout = jiffies - 1;
3836                         }
3837                         ifmgd->auth_data->timeout_started = true;
3838                 } else if (ifmgd->assoc_data &&
3839                            (ieee80211_is_assoc_req(fc) ||
3840                             ieee80211_is_reassoc_req(fc))) {
3841                         if (status_acked) {
3842                                 ifmgd->assoc_data->timeout =
3843                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3844                                 run_again(sdata, ifmgd->assoc_data->timeout);
3845                         } else {
3846                                 ifmgd->assoc_data->timeout = jiffies - 1;
3847                         }
3848                         ifmgd->assoc_data->timeout_started = true;
3849                 }
3850         }
3851
3852         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3853             time_after(jiffies, ifmgd->auth_data->timeout)) {
3854                 if (ifmgd->auth_data->done) {
3855                         /*
3856                          * ok ... we waited for assoc but userspace didn't,
3857                          * so let's just kill the auth data
3858                          */
3859                         ieee80211_destroy_auth_data(sdata, false);
3860                 } else if (ieee80211_auth(sdata)) {
3861                         u8 bssid[ETH_ALEN];
3862                         struct ieee80211_event event = {
3863                                 .type = MLME_EVENT,
3864                                 .u.mlme.data = AUTH_EVENT,
3865                                 .u.mlme.status = MLME_TIMEOUT,
3866                         };
3867
3868                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3869
3870                         ieee80211_destroy_auth_data(sdata, false);
3871
3872                         cfg80211_auth_timeout(sdata->dev, bssid);
3873                         drv_event_callback(sdata->local, sdata, &event);
3874                 }
3875         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3876                 run_again(sdata, ifmgd->auth_data->timeout);
3877
3878         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3879             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3880                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3881                     ieee80211_do_assoc(sdata)) {
3882                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3883                         struct ieee80211_event event = {
3884                                 .type = MLME_EVENT,
3885                                 .u.mlme.data = ASSOC_EVENT,
3886                                 .u.mlme.status = MLME_TIMEOUT,
3887                         };
3888
3889                         ieee80211_destroy_assoc_data(sdata, false);
3890                         cfg80211_assoc_timeout(sdata->dev, bss);
3891                         drv_event_callback(sdata->local, sdata, &event);
3892                 }
3893         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3894                 run_again(sdata, ifmgd->assoc_data->timeout);
3895
3896         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3897             ifmgd->associated) {
3898                 u8 bssid[ETH_ALEN];
3899                 int max_tries;
3900
3901                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3902
3903                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3904                         max_tries = max_nullfunc_tries;
3905                 else
3906                         max_tries = max_probe_tries;
3907
3908                 /* ACK received for nullfunc probing frame */
3909                 if (!ifmgd->probe_send_count)
3910                         ieee80211_reset_ap_probe(sdata);
3911                 else if (ifmgd->nullfunc_failed) {
3912                         if (ifmgd->probe_send_count < max_tries) {
3913                                 mlme_dbg(sdata,
3914                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3915                                          bssid, ifmgd->probe_send_count,
3916                                          max_tries);
3917                                 ieee80211_mgd_probe_ap_send(sdata);
3918                         } else {
3919                                 mlme_dbg(sdata,
3920                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3921                                          bssid);
3922                                 ieee80211_sta_connection_lost(sdata, bssid,
3923                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3924                                         false);
3925                         }
3926                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3927                         run_again(sdata, ifmgd->probe_timeout);
3928                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3929                         mlme_dbg(sdata,
3930                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3931                                  bssid, probe_wait_ms);
3932                         ieee80211_sta_connection_lost(sdata, bssid,
3933                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3934                 } else if (ifmgd->probe_send_count < max_tries) {
3935                         mlme_dbg(sdata,
3936                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3937                                  bssid, probe_wait_ms,
3938                                  ifmgd->probe_send_count, max_tries);
3939                         ieee80211_mgd_probe_ap_send(sdata);
3940                 } else {
3941                         /*
3942                          * We actually lost the connection ... or did we?
3943                          * Let's make sure!
3944                          */
3945                         wiphy_debug(local->hw.wiphy,
3946                                     "%s: No probe response from AP %pM"
3947                                     " after %dms, disconnecting.\n",
3948                                     sdata->name,
3949                                     bssid, probe_wait_ms);
3950
3951                         ieee80211_sta_connection_lost(sdata, bssid,
3952                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3953                 }
3954         }
3955
3956         sdata_unlock(sdata);
3957 }
3958
3959 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3960 {
3961         struct ieee80211_sub_if_data *sdata =
3962                 (struct ieee80211_sub_if_data *) data;
3963         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3964
3965         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3966                 return;
3967
3968         sdata->u.mgd.connection_loss = false;
3969         ieee80211_queue_work(&sdata->local->hw,
3970                              &sdata->u.mgd.beacon_connection_loss_work);
3971 }
3972
3973 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3974 {
3975         struct ieee80211_sub_if_data *sdata =
3976                 (struct ieee80211_sub_if_data *) data;
3977         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3978         struct ieee80211_local *local = sdata->local;
3979
3980         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3981                 return;
3982
3983         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3984 }
3985
3986 static void ieee80211_sta_monitor_work(struct work_struct *work)
3987 {
3988         struct ieee80211_sub_if_data *sdata =
3989                 container_of(work, struct ieee80211_sub_if_data,
3990                              u.mgd.monitor_work);
3991
3992         ieee80211_mgd_probe_ap(sdata, false);
3993 }
3994
3995 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3996 {
3997         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3998                 __ieee80211_stop_poll(sdata);
3999
4000                 /* let's probe the connection once */
4001                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4002                         ieee80211_queue_work(&sdata->local->hw,
4003                                              &sdata->u.mgd.monitor_work);
4004                 /* and do all the other regular work too */
4005                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4006         }
4007 }
4008
4009 #ifdef CONFIG_PM
4010 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4011 {
4012         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4013         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4014
4015         sdata_lock(sdata);
4016
4017         if (ifmgd->auth_data || ifmgd->assoc_data) {
4018                 const u8 *bssid = ifmgd->auth_data ?
4019                                 ifmgd->auth_data->bss->bssid :
4020                                 ifmgd->assoc_data->bss->bssid;
4021
4022                 /*
4023                  * If we are trying to authenticate / associate while suspending,
4024                  * cfg80211 won't know and won't actually abort those attempts,
4025                  * thus we need to do that ourselves.
4026                  */
4027                 ieee80211_send_deauth_disassoc(sdata, bssid,
4028                                                IEEE80211_STYPE_DEAUTH,
4029                                                WLAN_REASON_DEAUTH_LEAVING,
4030                                                false, frame_buf);
4031                 if (ifmgd->assoc_data)
4032                         ieee80211_destroy_assoc_data(sdata, false);
4033                 if (ifmgd->auth_data)
4034                         ieee80211_destroy_auth_data(sdata, false);
4035                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4036                                       IEEE80211_DEAUTH_FRAME_LEN);
4037         }
4038
4039         /* This is a bit of a hack - we should find a better and more generic
4040          * solution to this. Normally when suspending, cfg80211 will in fact
4041          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4042          * auth (not so important) or assoc (this is the problem) process.
4043          *
4044          * As a consequence, it can happen that we are in the process of both
4045          * associating and suspending, and receive an association response
4046          * after cfg80211 has checked if it needs to disconnect, but before
4047          * we actually set the flag to drop incoming frames. This will then
4048          * cause the workqueue flush to process the association response in
4049          * the suspend, resulting in a successful association just before it
4050          * tries to remove the interface from the driver, which now though
4051          * has a channel context assigned ... this results in issues.
4052          *
4053          * To work around this (for now) simply deauth here again if we're
4054          * now connected.
4055          */
4056         if (ifmgd->associated && !sdata->local->wowlan) {
4057                 u8 bssid[ETH_ALEN];
4058                 struct cfg80211_deauth_request req = {
4059                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4060                         .bssid = bssid,
4061                 };
4062
4063                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4064                 ieee80211_mgd_deauth(sdata, &req);
4065         }
4066
4067         sdata_unlock(sdata);
4068 }
4069
4070 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4071 {
4072         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4073
4074         sdata_lock(sdata);
4075         if (!ifmgd->associated) {
4076                 sdata_unlock(sdata);
4077                 return;
4078         }
4079
4080         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4081                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4082                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4083                 ieee80211_sta_connection_lost(sdata,
4084                                               ifmgd->associated->bssid,
4085                                               WLAN_REASON_UNSPECIFIED,
4086                                               true);
4087                 sdata_unlock(sdata);
4088                 return;
4089         }
4090         sdata_unlock(sdata);
4091 }
4092 #endif
4093
4094 /* interface setup */
4095 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4096 {
4097         struct ieee80211_if_managed *ifmgd;
4098
4099         ifmgd = &sdata->u.mgd;
4100         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4101         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4102         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4103                   ieee80211_beacon_connection_loss_work);
4104         INIT_WORK(&ifmgd->csa_connection_drop_work,
4105                   ieee80211_csa_connection_drop_work);
4106         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4107         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4108                           ieee80211_tdls_peer_del_work);
4109         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4110                     (unsigned long) sdata);
4111         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4112                     (unsigned long) sdata);
4113         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4114                     (unsigned long) sdata);
4115         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4116                     (unsigned long) sdata);
4117         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4118                           ieee80211_sta_handle_tspec_ac_params_wk);
4119
4120         ifmgd->flags = 0;
4121         ifmgd->powersave = sdata->wdev.ps;
4122         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4123         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4124         ifmgd->p2p_noa_index = -1;
4125
4126         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4127                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4128         else
4129                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4130
4131         /* Setup TDLS data */
4132         spin_lock_init(&ifmgd->teardown_lock);
4133         ifmgd->teardown_skb = NULL;
4134         ifmgd->orig_teardown_skb = NULL;
4135 }
4136
4137 /* scan finished notification */
4138 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4139 {
4140         struct ieee80211_sub_if_data *sdata;
4141
4142         /* Restart STA timers */
4143         rcu_read_lock();
4144         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4145                 if (ieee80211_sdata_running(sdata))
4146                         ieee80211_restart_sta_timer(sdata);
4147         }
4148         rcu_read_unlock();
4149 }
4150
4151 int ieee80211_max_network_latency(struct notifier_block *nb,
4152                                   unsigned long data, void *dummy)
4153 {
4154         s32 latency_usec = (s32) data;
4155         struct ieee80211_local *local =
4156                 container_of(nb, struct ieee80211_local,
4157                              network_latency_notifier);
4158
4159         mutex_lock(&local->iflist_mtx);
4160         ieee80211_recalc_ps(local, latency_usec);
4161         mutex_unlock(&local->iflist_mtx);
4162
4163         return NOTIFY_OK;
4164 }
4165
4166 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4167                                      struct cfg80211_bss *cbss)
4168 {
4169         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4170         const u8 *ht_cap_ie, *vht_cap_ie;
4171         const struct ieee80211_ht_cap *ht_cap;
4172         const struct ieee80211_vht_cap *vht_cap;
4173         u8 chains = 1;
4174
4175         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4176                 return chains;
4177
4178         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4179         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4180                 ht_cap = (void *)(ht_cap_ie + 2);
4181                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4182                 /*
4183                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4184                  *       "Tx Unequal Modulation Supported" fields.
4185                  */
4186         }
4187
4188         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4189                 return chains;
4190
4191         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4192         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4193                 u8 nss;
4194                 u16 tx_mcs_map;
4195
4196                 vht_cap = (void *)(vht_cap_ie + 2);
4197                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4198                 for (nss = 8; nss > 0; nss--) {
4199                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4200                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4201                                 break;
4202                 }
4203                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4204                 chains = max(chains, nss);
4205         }
4206
4207         return chains;
4208 }
4209
4210 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4211                                   struct cfg80211_bss *cbss)
4212 {
4213         struct ieee80211_local *local = sdata->local;
4214         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4215         const struct ieee80211_ht_cap *ht_cap = NULL;
4216         const struct ieee80211_ht_operation *ht_oper = NULL;
4217         const struct ieee80211_vht_operation *vht_oper = NULL;
4218         struct ieee80211_supported_band *sband;
4219         struct cfg80211_chan_def chandef;
4220         int ret;
4221         u32 i;
4222         bool have_80mhz;
4223
4224         sband = local->hw.wiphy->bands[cbss->channel->band];
4225
4226         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4227                           IEEE80211_STA_DISABLE_80P80MHZ |
4228                           IEEE80211_STA_DISABLE_160MHZ);
4229
4230         rcu_read_lock();
4231
4232         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4233             sband->ht_cap.ht_supported) {
4234                 const u8 *ht_oper_ie, *ht_cap_ie;
4235
4236                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4237                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4238                         ht_oper = (void *)(ht_oper_ie + 2);
4239
4240                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4241                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4242                         ht_cap = (void *)(ht_cap_ie + 2);
4243
4244                 if (!ht_cap) {
4245                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4246                         ht_oper = NULL;
4247                 }
4248         }
4249
4250         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4251             sband->vht_cap.vht_supported) {
4252                 const u8 *vht_oper_ie, *vht_cap;
4253
4254                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4255                                                    WLAN_EID_VHT_OPERATION);
4256                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4257                         vht_oper = (void *)(vht_oper_ie + 2);
4258                 if (vht_oper && !ht_oper) {
4259                         vht_oper = NULL;
4260                         sdata_info(sdata,
4261                                    "AP advertised VHT without HT, disabling both\n");
4262                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4263                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4264                 }
4265
4266                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4267                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4268                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4269                         vht_oper = NULL;
4270                 }
4271         }
4272
4273         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4274         have_80mhz = false;
4275         for (i = 0; i < sband->n_channels; i++) {
4276                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4277                                                 IEEE80211_CHAN_NO_80MHZ))
4278                         continue;
4279
4280                 have_80mhz = true;
4281                 break;
4282         }
4283
4284         if (!have_80mhz)
4285                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4286
4287         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4288                                                      cbss->channel,
4289                                                      ht_cap, ht_oper, vht_oper,
4290                                                      &chandef, false);
4291
4292         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4293                                       local->rx_chains);
4294
4295         rcu_read_unlock();
4296
4297         /* will change later if needed */
4298         sdata->smps_mode = IEEE80211_SMPS_OFF;
4299
4300         mutex_lock(&local->mtx);
4301         /*
4302          * If this fails (possibly due to channel context sharing
4303          * on incompatible channels, e.g. 80+80 and 160 sharing the
4304          * same control channel) try to use a smaller bandwidth.
4305          */
4306         ret = ieee80211_vif_use_channel(sdata, &chandef,
4307                                         IEEE80211_CHANCTX_SHARED);
4308
4309         /* don't downgrade for 5 and 10 MHz channels, though. */
4310         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4311             chandef.width == NL80211_CHAN_WIDTH_10)
4312                 goto out;
4313
4314         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4315                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4316                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4317                                                 IEEE80211_CHANCTX_SHARED);
4318         }
4319  out:
4320         mutex_unlock(&local->mtx);
4321         return ret;
4322 }
4323
4324 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4325                                      struct cfg80211_bss *cbss, bool assoc,
4326                                      bool override)
4327 {
4328         struct ieee80211_local *local = sdata->local;
4329         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4330         struct ieee80211_bss *bss = (void *)cbss->priv;
4331         struct sta_info *new_sta = NULL;
4332         struct ieee80211_supported_band *sband;
4333         bool have_sta = false;
4334         int err;
4335
4336         sband = local->hw.wiphy->bands[cbss->channel->band];
4337
4338         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4339                 return -EINVAL;
4340
4341         if (assoc) {
4342                 rcu_read_lock();
4343                 have_sta = sta_info_get(sdata, cbss->bssid);
4344                 rcu_read_unlock();
4345         }
4346
4347         if (!have_sta) {
4348                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4349                 if (!new_sta)
4350                         return -ENOMEM;
4351         }
4352
4353         if (new_sta || override) {
4354                 err = ieee80211_prep_channel(sdata, cbss);
4355                 if (err) {
4356                         if (new_sta)
4357                                 sta_info_free(local, new_sta);
4358                         return -EINVAL;
4359                 }
4360         }
4361
4362         if (new_sta) {
4363                 u32 rates = 0, basic_rates = 0;
4364                 bool have_higher_than_11mbit;
4365                 int min_rate = INT_MAX, min_rate_index = -1;
4366                 struct ieee80211_chanctx_conf *chanctx_conf;
4367                 const struct cfg80211_bss_ies *ies;
4368                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4369                 u32 rate_flags;
4370
4371                 rcu_read_lock();
4372                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4373                 if (WARN_ON(!chanctx_conf)) {
4374                         rcu_read_unlock();
4375                         sta_info_free(local, new_sta);
4376                         return -EINVAL;
4377                 }
4378                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4379                 rcu_read_unlock();
4380
4381                 ieee80211_get_rates(sband, bss->supp_rates,
4382                                     bss->supp_rates_len,
4383                                     &rates, &basic_rates,
4384                                     &have_higher_than_11mbit,
4385                                     &min_rate, &min_rate_index,
4386                                     shift, rate_flags);
4387
4388                 /*
4389                  * This used to be a workaround for basic rates missing
4390                  * in the association response frame. Now that we no
4391                  * longer use the basic rates from there, it probably
4392                  * doesn't happen any more, but keep the workaround so
4393                  * in case some *other* APs are buggy in different ways
4394                  * we can connect -- with a warning.
4395                  */
4396                 if (!basic_rates && min_rate_index >= 0) {
4397                         sdata_info(sdata,
4398                                    "No basic rates, using min rate instead\n");
4399                         basic_rates = BIT(min_rate_index);
4400                 }
4401
4402                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4403                 sdata->vif.bss_conf.basic_rates = basic_rates;
4404
4405                 /* cf. IEEE 802.11 9.2.12 */
4406                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4407                     have_higher_than_11mbit)
4408                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4409                 else
4410                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4411
4412                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4413
4414                 /* set timing information */
4415                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4416                 rcu_read_lock();
4417                 ies = rcu_dereference(cbss->beacon_ies);
4418                 if (ies) {
4419                         const u8 *tim_ie;
4420
4421                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4422                         sdata->vif.bss_conf.sync_device_ts =
4423                                 bss->device_ts_beacon;
4424                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4425                                                   ies->data, ies->len);
4426                         if (tim_ie && tim_ie[1] >= 2)
4427                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4428                         else
4429                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4430                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4431                                                TIMING_BEACON_ONLY)) {
4432                         ies = rcu_dereference(cbss->proberesp_ies);
4433                         /* must be non-NULL since beacon IEs were NULL */
4434                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4435                         sdata->vif.bss_conf.sync_device_ts =
4436                                 bss->device_ts_presp;
4437                         sdata->vif.bss_conf.sync_dtim_count = 0;
4438                 } else {
4439                         sdata->vif.bss_conf.sync_tsf = 0;
4440                         sdata->vif.bss_conf.sync_device_ts = 0;
4441                         sdata->vif.bss_conf.sync_dtim_count = 0;
4442                 }
4443                 rcu_read_unlock();
4444
4445                 /* tell driver about BSSID, basic rates and timing */
4446                 ieee80211_bss_info_change_notify(sdata,
4447                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4448                         BSS_CHANGED_BEACON_INT);
4449
4450                 if (assoc)
4451                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4452
4453                 err = sta_info_insert(new_sta);
4454                 new_sta = NULL;
4455                 if (err) {
4456                         sdata_info(sdata,
4457                                    "failed to insert STA entry for the AP (error %d)\n",
4458                                    err);
4459                         return err;
4460                 }
4461         } else
4462                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4463
4464         /* Cancel scan to ensure that nothing interferes with connection */
4465         if (local->scanning)
4466                 ieee80211_scan_cancel(local);
4467
4468         return 0;
4469 }
4470
4471 /* config hooks */
4472 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4473                        struct cfg80211_auth_request *req)
4474 {
4475         struct ieee80211_local *local = sdata->local;
4476         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4477         struct ieee80211_mgd_auth_data *auth_data;
4478         u16 auth_alg;
4479         int err;
4480
4481         /* prepare auth data structure */
4482
4483         switch (req->auth_type) {
4484         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4485                 auth_alg = WLAN_AUTH_OPEN;
4486                 break;
4487         case NL80211_AUTHTYPE_SHARED_KEY:
4488                 if (IS_ERR(local->wep_tx_tfm))
4489                         return -EOPNOTSUPP;
4490                 auth_alg = WLAN_AUTH_SHARED_KEY;
4491                 break;
4492         case NL80211_AUTHTYPE_FT:
4493                 auth_alg = WLAN_AUTH_FT;
4494                 break;
4495         case NL80211_AUTHTYPE_NETWORK_EAP:
4496                 auth_alg = WLAN_AUTH_LEAP;
4497                 break;
4498         case NL80211_AUTHTYPE_SAE:
4499                 auth_alg = WLAN_AUTH_SAE;
4500                 break;
4501         default:
4502                 return -EOPNOTSUPP;
4503         }
4504
4505         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4506                             req->ie_len, GFP_KERNEL);
4507         if (!auth_data)
4508                 return -ENOMEM;
4509
4510         auth_data->bss = req->bss;
4511
4512         if (req->sae_data_len >= 4) {
4513                 __le16 *pos = (__le16 *) req->sae_data;
4514                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4515                 auth_data->sae_status = le16_to_cpu(pos[1]);
4516                 memcpy(auth_data->data, req->sae_data + 4,
4517                        req->sae_data_len - 4);
4518                 auth_data->data_len += req->sae_data_len - 4;
4519         }
4520
4521         if (req->ie && req->ie_len) {
4522                 memcpy(&auth_data->data[auth_data->data_len],
4523                        req->ie, req->ie_len);
4524                 auth_data->data_len += req->ie_len;
4525         }
4526
4527         if (req->key && req->key_len) {
4528                 auth_data->key_len = req->key_len;
4529                 auth_data->key_idx = req->key_idx;
4530                 memcpy(auth_data->key, req->key, req->key_len);
4531         }
4532
4533         auth_data->algorithm = auth_alg;
4534
4535         /* try to authenticate/probe */
4536
4537         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4538             ifmgd->assoc_data) {
4539                 err = -EBUSY;
4540                 goto err_free;
4541         }
4542
4543         if (ifmgd->auth_data)
4544                 ieee80211_destroy_auth_data(sdata, false);
4545
4546         /* prep auth_data so we don't go into idle on disassoc */
4547         ifmgd->auth_data = auth_data;
4548
4549         if (ifmgd->associated) {
4550                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4551
4552                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4553                                        WLAN_REASON_UNSPECIFIED,
4554                                        false, frame_buf);
4555
4556                 ieee80211_report_disconnect(sdata, frame_buf,
4557                                             sizeof(frame_buf), true,
4558                                             WLAN_REASON_UNSPECIFIED);
4559         }
4560
4561         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4562
4563         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4564         if (err)
4565                 goto err_clear;
4566
4567         err = ieee80211_auth(sdata);
4568         if (err) {
4569                 sta_info_destroy_addr(sdata, req->bss->bssid);
4570                 goto err_clear;
4571         }
4572
4573         /* hold our own reference */
4574         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4575         return 0;
4576
4577  err_clear:
4578         eth_zero_addr(ifmgd->bssid);
4579         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4580         ifmgd->auth_data = NULL;
4581         mutex_lock(&sdata->local->mtx);
4582         ieee80211_vif_release_channel(sdata);
4583         mutex_unlock(&sdata->local->mtx);
4584  err_free:
4585         kfree(auth_data);
4586         return err;
4587 }
4588
4589 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4590                                         const u8 *wmm_param, int len)
4591 {
4592         const u8 *pos;
4593         size_t left;
4594
4595         if (len < 8)
4596                 return false;
4597
4598         if (wmm_param[5] != 1 /* version */)
4599                 return false;
4600
4601         pos = wmm_param + 8;
4602         left = len - 8;
4603
4604         for (; left >= 4; left -= 4, pos += 4) {
4605                 u8 aifsn = pos[0] & 0x0f;
4606                 u8 ecwmin = pos[1] & 0x0f;
4607                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4608                 int aci = (pos[0] >> 5) & 0x03;
4609
4610                 if (aifsn < 2) {
4611                         sdata_info(sdata,
4612                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4613                                    aifsn, aci);
4614                         return false;
4615                 }
4616                 if (ecwmin > ecwmax) {
4617                         sdata_info(sdata,
4618                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4619                                    ecwmin, ecwmax, aci);
4620                         return false;
4621                 }
4622         }
4623
4624         return true;
4625 }
4626
4627 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4628                         struct cfg80211_assoc_request *req)
4629 {
4630         struct ieee80211_local *local = sdata->local;
4631         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4632         struct ieee80211_bss *bss = (void *)req->bss->priv;
4633         struct ieee80211_mgd_assoc_data *assoc_data;
4634         const struct cfg80211_bss_ies *beacon_ies;
4635         struct ieee80211_supported_band *sband;
4636         const u8 *ssidie, *ht_ie, *vht_ie;
4637         int i, err;
4638         bool override = false;
4639
4640         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4641         if (!assoc_data)
4642                 return -ENOMEM;
4643
4644         rcu_read_lock();
4645         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4646         if (!ssidie) {
4647                 rcu_read_unlock();
4648                 kfree(assoc_data);
4649                 return -EINVAL;
4650         }
4651         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4652         assoc_data->ssid_len = ssidie[1];
4653         rcu_read_unlock();
4654
4655         if (ifmgd->associated) {
4656                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4657
4658                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4659                                        WLAN_REASON_UNSPECIFIED,
4660                                        false, frame_buf);
4661
4662                 ieee80211_report_disconnect(sdata, frame_buf,
4663                                             sizeof(frame_buf), true,
4664                                             WLAN_REASON_UNSPECIFIED);
4665         }
4666
4667         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4668                 err = -EBUSY;
4669                 goto err_free;
4670         }
4671
4672         if (ifmgd->assoc_data) {
4673                 err = -EBUSY;
4674                 goto err_free;
4675         }
4676
4677         if (ifmgd->auth_data) {
4678                 bool match;
4679
4680                 /* keep sta info, bssid if matching */
4681                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4682                 ieee80211_destroy_auth_data(sdata, match);
4683         }
4684
4685         /* prepare assoc data */
4686
4687         ifmgd->beacon_crc_valid = false;
4688
4689         assoc_data->wmm = bss->wmm_used &&
4690                           (local->hw.queues >= IEEE80211_NUM_ACS);
4691         if (assoc_data->wmm) {
4692                 /* try to check validity of WMM params IE */
4693                 const struct cfg80211_bss_ies *ies;
4694                 const u8 *wp, *start, *end;
4695
4696                 rcu_read_lock();
4697                 ies = rcu_dereference(req->bss->ies);
4698                 start = ies->data;
4699                 end = start + ies->len;
4700
4701                 while (true) {
4702                         wp = cfg80211_find_vendor_ie(
4703                                 WLAN_OUI_MICROSOFT,
4704                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4705                                 start, end - start);
4706                         if (!wp)
4707                                 break;
4708                         start = wp + wp[1] + 2;
4709                         /* if this IE is too short, try the next */
4710                         if (wp[1] <= 4)
4711                                 continue;
4712                         /* if this IE is WMM params, we found what we wanted */
4713                         if (wp[6] == 1)
4714                                 break;
4715                 }
4716
4717                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4718                                                         wp[1] - 2)) {
4719                         assoc_data->wmm = false;
4720                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4721                 }
4722                 rcu_read_unlock();
4723         }
4724
4725         /*
4726          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4727          * We still associate in non-HT mode (11a/b/g) if any one of these
4728          * ciphers is configured as pairwise.
4729          * We can set this to true for non-11n hardware, that'll be checked
4730          * separately along with the peer capabilities.
4731          */
4732         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4733                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4734                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4735                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4736                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4737                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4738                         netdev_info(sdata->dev,
4739                                     "disabling HT/VHT due to WEP/TKIP use\n");
4740                 }
4741         }
4742
4743         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4744         sband = local->hw.wiphy->bands[req->bss->channel->band];
4745         if (!sband->ht_cap.ht_supported ||
4746             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4747             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4748                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4749                 if (!bss->wmm_used &&
4750                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4751                         netdev_info(sdata->dev,
4752                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4753         }
4754
4755         /* disable VHT if we don't support it or the AP doesn't use WMM */
4756         if (!sband->vht_cap.vht_supported ||
4757             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4758             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4759                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4760                 if (!bss->wmm_used &&
4761                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4762                         netdev_info(sdata->dev,
4763                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4764         }
4765
4766         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4767         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4768                sizeof(ifmgd->ht_capa_mask));
4769
4770         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4771         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4772                sizeof(ifmgd->vht_capa_mask));
4773
4774         if (req->ie && req->ie_len) {
4775                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4776                 assoc_data->ie_len = req->ie_len;
4777         }
4778
4779         assoc_data->bss = req->bss;
4780
4781         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4782                 if (ifmgd->powersave)
4783                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4784                 else
4785                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4786         } else
4787                 sdata->smps_mode = ifmgd->req_smps;
4788
4789         assoc_data->capability = req->bss->capability;
4790         assoc_data->supp_rates = bss->supp_rates;
4791         assoc_data->supp_rates_len = bss->supp_rates_len;
4792
4793         rcu_read_lock();
4794         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4795         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4796                 assoc_data->ap_ht_param =
4797                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4798         else
4799                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4800         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4801         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4802                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4803                        sizeof(struct ieee80211_vht_cap));
4804         else
4805                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4806         rcu_read_unlock();
4807
4808         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4809                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4810              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4811                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4812
4813         if (bss->wmm_used && bss->uapsd_supported &&
4814             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4815                 assoc_data->uapsd = true;
4816                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4817         } else {
4818                 assoc_data->uapsd = false;
4819                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4820         }
4821
4822         if (req->prev_bssid)
4823                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4824
4825         if (req->use_mfp) {
4826                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4827                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4828         } else {
4829                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4830                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4831         }
4832
4833         if (req->flags & ASSOC_REQ_USE_RRM)
4834                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4835         else
4836                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4837
4838         if (req->crypto.control_port)
4839                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4840         else
4841                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4842
4843         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4844         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4845         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4846                                                         sdata->vif.type);
4847
4848         /* kick off associate process */
4849
4850         ifmgd->assoc_data = assoc_data;
4851         ifmgd->dtim_period = 0;
4852         ifmgd->have_beacon = false;
4853
4854         /* override HT/VHT configuration only if the AP and we support it */
4855         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4856                 struct ieee80211_sta_ht_cap sta_ht_cap;
4857
4858                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4859                         override = true;
4860
4861                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4862                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4863
4864                 /* check for 40 MHz disable override */
4865                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4866                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4867                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4868                         override = true;
4869
4870                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4871                     req->flags & ASSOC_REQ_DISABLE_VHT)
4872                         override = true;
4873         }
4874
4875         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4876                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4877                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4878         }
4879
4880         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4881                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4882
4883         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4884         if (err)
4885                 goto err_clear;
4886
4887         rcu_read_lock();
4888         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4889
4890         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4891             !beacon_ies) {
4892                 /*
4893                  * Wait up to one beacon interval ...
4894                  * should this be more if we miss one?
4895                  */
4896                 sdata_info(sdata, "waiting for beacon from %pM\n",
4897                            ifmgd->bssid);
4898                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4899                 assoc_data->timeout_started = true;
4900                 assoc_data->need_beacon = true;
4901         } else if (beacon_ies) {
4902                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4903                                                     beacon_ies->data,
4904                                                     beacon_ies->len);
4905                 u8 dtim_count = 0;
4906
4907                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4908                         const struct ieee80211_tim_ie *tim;
4909                         tim = (void *)(tim_ie + 2);
4910                         ifmgd->dtim_period = tim->dtim_period;
4911                         dtim_count = tim->dtim_count;
4912                 }
4913                 ifmgd->have_beacon = true;
4914                 assoc_data->timeout = jiffies;
4915                 assoc_data->timeout_started = true;
4916
4917                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4918                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4919                         sdata->vif.bss_conf.sync_device_ts =
4920                                 bss->device_ts_beacon;
4921                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4922                 }
4923         } else {
4924                 assoc_data->timeout = jiffies;
4925                 assoc_data->timeout_started = true;
4926         }
4927         rcu_read_unlock();
4928
4929         run_again(sdata, assoc_data->timeout);
4930
4931         if (bss->corrupt_data) {
4932                 char *corrupt_type = "data";
4933                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4934                         if (bss->corrupt_data &
4935                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4936                                 corrupt_type = "beacon and probe response";
4937                         else
4938                                 corrupt_type = "beacon";
4939                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4940                         corrupt_type = "probe response";
4941                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4942                            corrupt_type);
4943         }
4944
4945         return 0;
4946  err_clear:
4947         eth_zero_addr(ifmgd->bssid);
4948         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4949         ifmgd->assoc_data = NULL;
4950  err_free:
4951         kfree(assoc_data);
4952         return err;
4953 }
4954
4955 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4956                          struct cfg80211_deauth_request *req)
4957 {
4958         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4959         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4960         bool tx = !req->local_state_change;
4961
4962         if (ifmgd->auth_data &&
4963             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4964                 sdata_info(sdata,
4965                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4966                            req->bssid, req->reason_code,
4967                            ieee80211_get_reason_code_string(req->reason_code));
4968
4969                 drv_mgd_prepare_tx(sdata->local, sdata);
4970                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4971                                                IEEE80211_STYPE_DEAUTH,
4972                                                req->reason_code, tx,
4973                                                frame_buf);
4974                 ieee80211_destroy_auth_data(sdata, false);
4975                 ieee80211_report_disconnect(sdata, frame_buf,
4976                                             sizeof(frame_buf), true,
4977                                             req->reason_code);
4978
4979                 return 0;
4980         }
4981
4982         if (ifmgd->associated &&
4983             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4984                 sdata_info(sdata,
4985                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4986                            req->bssid, req->reason_code,
4987                            ieee80211_get_reason_code_string(req->reason_code));
4988
4989                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4990                                        req->reason_code, tx, frame_buf);
4991                 ieee80211_report_disconnect(sdata, frame_buf,
4992                                             sizeof(frame_buf), true,
4993                                             req->reason_code);
4994                 return 0;
4995         }
4996
4997         return -ENOTCONN;
4998 }
4999
5000 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5001                            struct cfg80211_disassoc_request *req)
5002 {
5003         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5004         u8 bssid[ETH_ALEN];
5005         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5006
5007         /*
5008          * cfg80211 should catch this ... but it's racy since
5009          * we can receive a disassoc frame, process it, hand it
5010          * to cfg80211 while that's in a locked section already
5011          * trying to tell us that the user wants to disconnect.
5012          */
5013         if (ifmgd->associated != req->bss)
5014                 return -ENOLINK;
5015
5016         sdata_info(sdata,
5017                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5018                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5019
5020         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5021         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5022                                req->reason_code, !req->local_state_change,
5023                                frame_buf);
5024
5025         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5026                                     req->reason_code);
5027
5028         return 0;
5029 }
5030
5031 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5032 {
5033         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5034
5035         /*
5036          * Make sure some work items will not run after this,
5037          * they will not do anything but might not have been
5038          * cancelled when disconnecting.
5039          */
5040         cancel_work_sync(&ifmgd->monitor_work);
5041         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5042         cancel_work_sync(&ifmgd->request_smps_work);
5043         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5044         cancel_work_sync(&ifmgd->chswitch_work);
5045         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5046
5047         sdata_lock(sdata);
5048         if (ifmgd->assoc_data) {
5049                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5050                 ieee80211_destroy_assoc_data(sdata, false);
5051                 cfg80211_assoc_timeout(sdata->dev, bss);
5052         }
5053         if (ifmgd->auth_data)
5054                 ieee80211_destroy_auth_data(sdata, false);
5055         spin_lock_bh(&ifmgd->teardown_lock);
5056         if (ifmgd->teardown_skb) {
5057                 kfree_skb(ifmgd->teardown_skb);
5058                 ifmgd->teardown_skb = NULL;
5059                 ifmgd->orig_teardown_skb = NULL;
5060         }
5061         spin_unlock_bh(&ifmgd->teardown_lock);
5062         del_timer_sync(&ifmgd->timer);
5063         sdata_unlock(sdata);
5064 }
5065
5066 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5067                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5068                                gfp_t gfp)
5069 {
5070         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5071
5072         trace_api_cqm_rssi_notify(sdata, rssi_event);
5073
5074         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5075 }
5076 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5077
5078 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5079 {
5080         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5081
5082         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5083
5084         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5085 }
5086 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);