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 - 2016 Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33 #include "fils_aead.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(!ifmgd->associated))
 127                 return;
 128
 129         if (ifmgd->probe_send_count)
 130                 ifmgd->probe_send_count = 0;
 131
 132         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 133                 return;
 134
 135         mod_timer(&ifmgd->conn_mon_timer,
 136                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 137 }
 138
 139 static int ecw2cw(int ecw)
 140 {
 141         return (1 << ecw) - 1;
 142 }
 143
 144 static u32
 145 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 146                              struct ieee80211_supported_band *sband,
 147                              struct ieee80211_channel *channel,
 148                              const struct ieee80211_ht_cap *ht_cap,
 149                              const struct ieee80211_ht_operation *ht_oper,
 150                              const struct ieee80211_vht_operation *vht_oper,
 151                              struct cfg80211_chan_def *chandef, bool tracking)
 152 {
 153         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 154         struct cfg80211_chan_def vht_chandef;
 155         struct ieee80211_sta_ht_cap sta_ht_cap;
 156         u32 ht_cfreq, ret;
 157
 158         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 159         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 160
 161         chandef->chan = channel;
 162         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 163         chandef->center_freq1 = channel->center_freq;
 164         chandef->center_freq2 = 0;
 165
 166         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 167                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 168                 goto out;
 169         }
 170
 171         chandef->width = NL80211_CHAN_WIDTH_20;
 172
 173         if (!(ht_cap->cap_info &
 174               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 175                 ret = IEEE80211_STA_DISABLE_40MHZ;
 176                 vht_chandef = *chandef;
 177                 goto out;
 178         }
 179
 180         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 181                                                   channel->band);
 182         /* check that channel matches the right operating channel */
 183         if (!tracking && channel->center_freq != ht_cfreq) {
 184                 /*
 185                  * It's possible that some APs are confused here;
 186                  * Netgear WNDR3700 sometimes reports 4 higher than
 187                  * the actual channel in association responses, but
 188                  * since we look at probe response/beacon data here
 189                  * it should be OK.
 190                  */
 191                 sdata_info(sdata,
 192                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 193                            channel->center_freq, ht_cfreq,
 194                            ht_oper->primary_chan, channel->band);
 195                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 196                 goto out;
 197         }
 198
 199         /* check 40 MHz support, if we have it */
 200         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 201                 ieee80211_chandef_ht_oper(ht_oper, chandef);
 202         } else {
 203                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 204                 ret = IEEE80211_STA_DISABLE_VHT;
 205                 /* also mark 40 MHz disabled */
 206                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 207                 goto out;
 208         }
 209
 210         if (!vht_oper || !sband->vht_cap.vht_supported) {
 211                 ret = IEEE80211_STA_DISABLE_VHT;
 212                 goto out;
 213         }
 214
 215         vht_chandef = *chandef;
 216         if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
 217                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 218                         sdata_info(sdata,
 219                                    "AP VHT information is invalid, disable VHT\n");
 220                 ret = IEEE80211_STA_DISABLE_VHT;
 221                 goto out;
 222         }
 223
 224         if (!cfg80211_chandef_valid(&vht_chandef)) {
 225                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 226                         sdata_info(sdata,
 227                                    "AP VHT information is invalid, disable VHT\n");
 228                 ret = IEEE80211_STA_DISABLE_VHT;
 229                 goto out;
 230         }
 231
 232         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 233                 ret = 0;
 234                 goto out;
 235         }
 236
 237         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 238                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 239                         sdata_info(sdata,
 240                                    "AP VHT information doesn't match HT, disable VHT\n");
 241                 ret = IEEE80211_STA_DISABLE_VHT;
 242                 goto out;
 243         }
 244
 245         *chandef = vht_chandef;
 246
 247         ret = 0;
 248
 249 out:
 250         /*
 251          * When tracking the current AP, don't do any further checks if the
 252          * new chandef is identical to the one we're currently using for the
 253          * connection. This keeps us from playing ping-pong with regulatory,
 254          * without it the following can happen (for example):
 255          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 256          *  - AP advertises regdom US
 257          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 258          *  - the code below detects an unsupported channel, downgrades, and
 259          *    we disconnect from the AP in the caller
 260          *  - disconnect causes CRDA to reload world regdomain and the game
 261          *    starts anew.
 262          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 263          *
 264          * It seems possible that there are still scenarios with CSA or real
 265          * bandwidth changes where a this could happen, but those cases are
 266          * less common and wouldn't completely prevent using the AP.
 267          */
 268         if (tracking &&
 269             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 270                 return ret;
 271
 272         /* don't print the message below for VHT mismatch if VHT is disabled */
 273         if (ret & IEEE80211_STA_DISABLE_VHT)
 274                 vht_chandef = *chandef;
 275
 276         /*
 277          * Ignore the DISABLED flag when we're already connected and only
 278          * tracking the APs beacon for bandwidth changes - otherwise we
 279          * might get disconnected here if we connect to an AP, update our
 280          * regulatory information based on the AP's country IE and the
 281          * information we have is wrong/outdated and disables the channel
 282          * that we're actually using for the connection to the AP.
 283          */
 284         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 285                                         tracking ? 0 :
 286                                                    IEEE80211_CHAN_DISABLED)) {
 287                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 288                         ret = IEEE80211_STA_DISABLE_HT |
 289                               IEEE80211_STA_DISABLE_VHT;
 290                         break;
 291                 }
 292
 293                 ret |= ieee80211_chandef_downgrade(chandef);
 294         }
 295
 296         if (chandef->width != vht_chandef.width && !tracking)
 297                 sdata_info(sdata,
 298                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 299
 300         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 301         return ret;
 302 }
 303
 304 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 305                                struct sta_info *sta,
 306                                const struct ieee80211_ht_cap *ht_cap,
 307                                const struct ieee80211_ht_operation *ht_oper,
 308                                const struct ieee80211_vht_operation *vht_oper,
 309                                const u8 *bssid, u32 *changed)
 310 {
 311         struct ieee80211_local *local = sdata->local;
 312         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 313         struct ieee80211_supported_band *sband;
 314         struct ieee80211_channel *chan;
 315         struct cfg80211_chan_def chandef;
 316         u16 ht_opmode;
 317         u32 flags;
 318         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 319         int ret;
 320
 321         /* if HT was/is disabled, don't track any bandwidth changes */
 322         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 323                 return 0;
 324
 325         /* don't check VHT if we associated as non-VHT station */
 326         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 327                 vht_oper = NULL;
 328
 329         if (WARN_ON_ONCE(!sta))
 330                 return -EINVAL;
 331
 332         /*
 333          * if bss configuration changed store the new one -
 334          * this may be applicable even if channel is identical
 335          */
 336         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 337         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 338                 *changed |= BSS_CHANGED_HT;
 339                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 340         }
 341
 342         chan = sdata->vif.bss_conf.chandef.chan;
 343         sband = local->hw.wiphy->bands[chan->band];
 344
 345         /* calculate new channel (type) based on HT/VHT operation IEs */
 346         flags = ieee80211_determine_chantype(sdata, sband, chan,
 347                                              ht_cap, ht_oper, vht_oper,
 348                                              &chandef, true);
 349
 350         /*
 351          * Downgrade the new channel if we associated with restricted
 352          * capabilities. For example, if we associated as a 20 MHz STA
 353          * to a 40 MHz AP (due to regulatory, capabilities or config
 354          * reasons) then switching to a 40 MHz channel now won't do us
 355          * any good -- we couldn't use it with the AP.
 356          */
 357         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 358             chandef.width == NL80211_CHAN_WIDTH_80P80)
 359                 flags |= ieee80211_chandef_downgrade(&chandef);
 360         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 361             chandef.width == NL80211_CHAN_WIDTH_160)
 362                 flags |= ieee80211_chandef_downgrade(&chandef);
 363         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 364             chandef.width > NL80211_CHAN_WIDTH_20)
 365                 flags |= ieee80211_chandef_downgrade(&chandef);
 366
 367         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 368                 return 0;
 369
 370         sdata_info(sdata,
 371                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 372                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 373                    chandef.center_freq1, chandef.center_freq2);
 374
 375         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 376                                       IEEE80211_STA_DISABLE_VHT |
 377                                       IEEE80211_STA_DISABLE_40MHZ |
 378                                       IEEE80211_STA_DISABLE_80P80MHZ |
 379                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 380             !cfg80211_chandef_valid(&chandef)) {
 381                 sdata_info(sdata,
 382                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 383                            ifmgd->bssid);
 384                 return -EINVAL;
 385         }
 386
 387         switch (chandef.width) {
 388         case NL80211_CHAN_WIDTH_20_NOHT:
 389         case NL80211_CHAN_WIDTH_20:
 390                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 391                 break;
 392         case NL80211_CHAN_WIDTH_40:
 393                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 394                 break;
 395         case NL80211_CHAN_WIDTH_80:
 396                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 397                 break;
 398         case NL80211_CHAN_WIDTH_80P80:
 399         case NL80211_CHAN_WIDTH_160:
 400                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 401                 break;
 402         default:
 403                 return -EINVAL;
 404         }
 405
 406         if (new_sta_bw > sta->cur_max_bandwidth)
 407                 new_sta_bw = sta->cur_max_bandwidth;
 408
 409         if (new_sta_bw < sta->sta.bandwidth) {
 410                 sta->sta.bandwidth = new_sta_bw;
 411                 rate_control_rate_update(local, sband, sta,
 412                                          IEEE80211_RC_BW_CHANGED);
 413         }
 414
 415         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 416         if (ret) {
 417                 sdata_info(sdata,
 418                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 419                            ifmgd->bssid);
 420                 return ret;
 421         }
 422
 423         if (new_sta_bw > sta->sta.bandwidth) {
 424                 sta->sta.bandwidth = new_sta_bw;
 425                 rate_control_rate_update(local, sband, sta,
 426                                          IEEE80211_RC_BW_CHANGED);
 427         }
 428
 429         return 0;
 430 }
 431
 432 /* frame sending functions */
 433
 434 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 435                                 struct sk_buff *skb, u8 ap_ht_param,
 436                                 struct ieee80211_supported_band *sband,
 437                                 struct ieee80211_channel *channel,
 438                                 enum ieee80211_smps_mode smps)
 439 {
 440         u8 *pos;
 441         u32 flags = channel->flags;
 442         u16 cap;
 443         struct ieee80211_sta_ht_cap ht_cap;
 444
 445         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 446
 447         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 448         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 449
 450         /* determine capability flags */
 451         cap = ht_cap.cap;
 452
 453         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 454         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 455                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 456                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 457                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 458                 }
 459                 break;
 460         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 461                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 462                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 463                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 464                 }
 465                 break;
 466         }
 467
 468         /*
 469          * If 40 MHz was disabled associate as though we weren't
 470          * capable of 40 MHz -- some broken APs will never fall
 471          * back to trying to transmit in 20 MHz.
 472          */
 473         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 474                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 475                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 476         }
 477
 478         /* set SM PS mode properly */
 479         cap &= ~IEEE80211_HT_CAP_SM_PS;
 480         switch (smps) {
 481         case IEEE80211_SMPS_AUTOMATIC:
 482         case IEEE80211_SMPS_NUM_MODES:
 483                 WARN_ON(1);
 484         case IEEE80211_SMPS_OFF:
 485                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 486                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 487                 break;
 488         case IEEE80211_SMPS_STATIC:
 489                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 490                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 491                 break;
 492         case IEEE80211_SMPS_DYNAMIC:
 493                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 494                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 495                 break;
 496         }
 497
 498         /* reserve and fill IE */
 499         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 500         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 501 }
 502
 503 /* This function determines vht capability flags for the association
 504  * and builds the IE.
 505  * Note - the function may set the owner of the MU-MIMO capability
 506  */
 507 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 508                                  struct sk_buff *skb,
 509                                  struct ieee80211_supported_band *sband,
 510                                  struct ieee80211_vht_cap *ap_vht_cap)
 511 {
 512         struct ieee80211_local *local = sdata->local;
 513         u8 *pos;
 514         u32 cap;
 515         struct ieee80211_sta_vht_cap vht_cap;
 516         u32 mask, ap_bf_sts, our_bf_sts;
 517
 518         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 519
 520         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 521         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 522
 523         /* determine capability flags */
 524         cap = vht_cap.cap;
 525
 526         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 527                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 528
 529                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 530                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 531                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 532                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 533         }
 534
 535         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 536                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 537                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 538         }
 539
 540         /*
 541          * Some APs apparently get confused if our capabilities are better
 542          * than theirs, so restrict what we advertise in the assoc request.
 543          */
 544         if (!(ap_vht_cap->vht_cap_info &
 545                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 546                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 547                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 548         else if (!(ap_vht_cap->vht_cap_info &
 549                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 550                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 551
 552         /*
 553          * If some other vif is using the MU-MIMO capablity we cannot associate
 554          * using MU-MIMO - this will lead to contradictions in the group-id
 555          * mechanism.
 556          * Ownership is defined since association request, in order to avoid
 557          * simultaneous associations with MU-MIMO.
 558          */
 559         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 560                 bool disable_mu_mimo = false;
 561                 struct ieee80211_sub_if_data *other;
 562
 563                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 564                         if (other->vif.mu_mimo_owner) {
 565                                 disable_mu_mimo = true;
 566                                 break;
 567                         }
 568                 }
 569                 if (disable_mu_mimo)
 570                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 571                 else
 572                         sdata->vif.mu_mimo_owner = true;
 573         }
 574
 575         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 576
 577         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 578         our_bf_sts = cap & mask;
 579
 580         if (ap_bf_sts < our_bf_sts) {
 581                 cap &= ~mask;
 582                 cap |= ap_bf_sts;
 583         }
 584
 585         /* reserve and fill IE */
 586         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 587         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 588 }
 589
 590 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 591 {
 592         struct ieee80211_local *local = sdata->local;
 593         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 594         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 595         struct sk_buff *skb;
 596         struct ieee80211_mgmt *mgmt;
 597         u8 *pos, qos_info;
 598         size_t offset = 0, noffset;
 599         int i, count, rates_len, supp_rates_len, shift;
 600         u16 capab;
 601         struct ieee80211_supported_band *sband;
 602         struct ieee80211_chanctx_conf *chanctx_conf;
 603         struct ieee80211_channel *chan;
 604         u32 rate_flags, rates = 0;
 605
 606         sdata_assert_lock(sdata);
 607
 608         rcu_read_lock();
 609         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 610         if (WARN_ON(!chanctx_conf)) {
 611                 rcu_read_unlock();
 612                 return;
 613         }
 614         chan = chanctx_conf->def.chan;
 615         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 616         rcu_read_unlock();
 617         sband = local->hw.wiphy->bands[chan->band];
 618         shift = ieee80211_vif_get_shift(&sdata->vif);
 619
 620         if (assoc_data->supp_rates_len) {
 621                 /*
 622                  * Get all rates supported by the device and the AP as
 623                  * some APs don't like getting a superset of their rates
 624                  * in the association request (e.g. D-Link DAP 1353 in
 625                  * b-only mode)...
 626                  */
 627                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 628                                                      assoc_data->supp_rates,
 629                                                      assoc_data->supp_rates_len,
 630                                                      &rates);
 631         } else {
 632                 /*
 633                  * In case AP not provide any supported rates information
 634                  * before association, we send information element(s) with
 635                  * all rates that we support.
 636                  */
 637                 rates_len = 0;
 638                 for (i = 0; i < sband->n_bitrates; i++) {
 639                         if ((rate_flags & sband->bitrates[i].flags)
 640                             != rate_flags)
 641                                 continue;
 642                         rates |= BIT(i);
 643                         rates_len++;
 644                 }
 645         }
 646
 647         skb = alloc_skb(local->hw.extra_tx_headroom +
 648                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 649                         2 + assoc_data->ssid_len + /* SSID */
 650                         4 + rates_len + /* (extended) rates */
 651                         4 + /* power capability */
 652                         2 + 2 * sband->n_channels + /* supported channels */
 653                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 654                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 655                         assoc_data->ie_len + /* extra IEs */
 656                         (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
 657                         9, /* WMM */
 658                         GFP_KERNEL);
 659         if (!skb)
 660                 return;
 661
 662         skb_reserve(skb, local->hw.extra_tx_headroom);
 663
 664         capab = WLAN_CAPABILITY_ESS;
 665
 666         if (sband->band == NL80211_BAND_2GHZ) {
 667                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 668                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 669         }
 670
 671         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 672                 capab |= WLAN_CAPABILITY_PRIVACY;
 673
 674         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 675             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 676                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 677
 678         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 679                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 680
 681         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 682         memset(mgmt, 0, 24);
 683         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 684         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 685         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 686
 687         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 688                 skb_put(skb, 10);
 689                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 690                                                   IEEE80211_STYPE_REASSOC_REQ);
 691                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 692                 mgmt->u.reassoc_req.listen_interval =
 693                                 cpu_to_le16(local->hw.conf.listen_interval);
 694                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 695                        ETH_ALEN);
 696         } else {
 697                 skb_put(skb, 4);
 698                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 699                                                   IEEE80211_STYPE_ASSOC_REQ);
 700                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 701                 mgmt->u.assoc_req.listen_interval =
 702                                 cpu_to_le16(local->hw.conf.listen_interval);
 703         }
 704
 705         /* SSID */
 706         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 707         *pos++ = WLAN_EID_SSID;
 708         *pos++ = assoc_data->ssid_len;
 709         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 710
 711         /* add all rates which were marked to be used above */
 712         supp_rates_len = rates_len;
 713         if (supp_rates_len > 8)
 714                 supp_rates_len = 8;
 715
 716         pos = skb_put(skb, supp_rates_len + 2);
 717         *pos++ = WLAN_EID_SUPP_RATES;
 718         *pos++ = supp_rates_len;
 719
 720         count = 0;
 721         for (i = 0; i < sband->n_bitrates; i++) {
 722                 if (BIT(i) & rates) {
 723                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 724                                                 5 * (1 << shift));
 725                         *pos++ = (u8) rate;
 726                         if (++count == 8)
 727                                 break;
 728                 }
 729         }
 730
 731         if (rates_len > count) {
 732                 pos = skb_put(skb, rates_len - count + 2);
 733                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 734                 *pos++ = rates_len - count;
 735
 736                 for (i++; i < sband->n_bitrates; i++) {
 737                         if (BIT(i) & rates) {
 738                                 int rate;
 739                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 740                                                     5 * (1 << shift));
 741                                 *pos++ = (u8) rate;
 742                         }
 743                 }
 744         }
 745
 746         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 747             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 748                 pos = skb_put(skb, 4);
 749                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 750                 *pos++ = 2;
 751                 *pos++ = 0; /* min tx power */
 752                  /* max tx power */
 753                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 754         }
 755
 756         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 757                 /* TODO: get this in reg domain format */
 758                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 759                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 760                 *pos++ = 2 * sband->n_channels;
 761                 for (i = 0; i < sband->n_channels; i++) {
 762                         *pos++ = ieee80211_frequency_to_channel(
 763                                         sband->channels[i].center_freq);
 764                         *pos++ = 1; /* one channel in the subband*/
 765                 }
 766         }
 767
 768         /* if present, add any custom IEs that go before HT */
 769         if (assoc_data->ie_len) {
 770                 static const u8 before_ht[] = {
 771                         WLAN_EID_SSID,
 772                         WLAN_EID_SUPP_RATES,
 773                         WLAN_EID_EXT_SUPP_RATES,
 774                         WLAN_EID_PWR_CAPABILITY,
 775                         WLAN_EID_SUPPORTED_CHANNELS,
 776                         WLAN_EID_RSN,
 777                         WLAN_EID_QOS_CAPA,
 778                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 779                         WLAN_EID_MOBILITY_DOMAIN,
 780                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 781                         WLAN_EID_RIC_DATA,              /* reassoc only */
 782                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 783                 };
 784                 static const u8 after_ric[] = {
 785                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 786                         WLAN_EID_HT_CAPABILITY,
 787                         WLAN_EID_BSS_COEX_2040,
 788                         WLAN_EID_EXT_CAPABILITY,
 789                         WLAN_EID_QOS_TRAFFIC_CAPA,
 790                         WLAN_EID_TIM_BCAST_REQ,
 791                         WLAN_EID_INTERWORKING,
 792                         /* 60GHz doesn't happen right now */
 793                         WLAN_EID_VHT_CAPABILITY,
 794                         WLAN_EID_OPMODE_NOTIF,
 795                 };
 796
 797                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 798                                                  assoc_data->ie_len,
 799                                                  before_ht,
 800                                                  ARRAY_SIZE(before_ht),
 801                                                  after_ric,
 802                                                  ARRAY_SIZE(after_ric),
 803                                                  offset);
 804                 pos = skb_put(skb, noffset - offset);
 805                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 806                 offset = noffset;
 807         }
 808
 809         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 810                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 811                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 812
 813         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 814                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 815                                     sband, chan, sdata->smps_mode);
 816
 817         /* if present, add any custom IEs that go before VHT */
 818         if (assoc_data->ie_len) {
 819                 static const u8 before_vht[] = {
 820                         WLAN_EID_SSID,
 821                         WLAN_EID_SUPP_RATES,
 822                         WLAN_EID_EXT_SUPP_RATES,
 823                         WLAN_EID_PWR_CAPABILITY,
 824                         WLAN_EID_SUPPORTED_CHANNELS,
 825                         WLAN_EID_RSN,
 826                         WLAN_EID_QOS_CAPA,
 827                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 828                         WLAN_EID_MOBILITY_DOMAIN,
 829                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 830                         WLAN_EID_HT_CAPABILITY,
 831                         WLAN_EID_BSS_COEX_2040,
 832                         WLAN_EID_EXT_CAPABILITY,
 833                         WLAN_EID_QOS_TRAFFIC_CAPA,
 834                         WLAN_EID_TIM_BCAST_REQ,
 835                         WLAN_EID_INTERWORKING,
 836                 };
 837
 838                 /* RIC already taken above, so no need to handle here anymore */
 839                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 840                                              before_vht, ARRAY_SIZE(before_vht),
 841                                              offset);
 842                 pos = skb_put(skb, noffset - offset);
 843                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 844                 offset = noffset;
 845         }
 846
 847         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 848                 ieee80211_add_vht_ie(sdata, skb, sband,
 849                                      &assoc_data->ap_vht_cap);
 850
 851         /* if present, add any custom non-vendor IEs that go after HT */
 852         if (assoc_data->ie_len) {
 853                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 854                                                     assoc_data->ie_len,
 855                                                     offset);
 856                 pos = skb_put(skb, noffset - offset);
 857                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 858                 offset = noffset;
 859         }
 860
 861         if (assoc_data->wmm) {
 862                 if (assoc_data->uapsd) {
 863                         qos_info = ifmgd->uapsd_queues;
 864                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 865                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 866                 } else {
 867                         qos_info = 0;
 868                 }
 869
 870                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 871         }
 872
 873         /* add any remaining custom (i.e. vendor specific here) IEs */
 874         if (assoc_data->ie_len) {
 875                 noffset = assoc_data->ie_len;
 876                 pos = skb_put(skb, noffset - offset);
 877                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 878         }
 879
 880         if (assoc_data->fils_kek_len &&
 881             fils_encrypt_assoc_req(skb, assoc_data) < 0) {
 882                 dev_kfree_skb(skb);
 883                 return;
 884         }
 885
 886         drv_mgd_prepare_tx(local, sdata);
 887
 888         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 889         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 890                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 891                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 892         ieee80211_tx_skb(sdata, skb);
 893 }
 894
 895 void ieee80211_send_pspoll(struct ieee80211_local *local,
 896                            struct ieee80211_sub_if_data *sdata)
 897 {
 898         struct ieee80211_pspoll *pspoll;
 899         struct sk_buff *skb;
 900
 901         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 902         if (!skb)
 903                 return;
 904
 905         pspoll = (struct ieee80211_pspoll *) skb->data;
 906         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 907
 908         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 909         ieee80211_tx_skb(sdata, skb);
 910 }
 911
 912 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 913                              struct ieee80211_sub_if_data *sdata,
 914                              bool powersave)
 915 {
 916         struct sk_buff *skb;
 917         struct ieee80211_hdr_3addr *nullfunc;
 918         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 919
 920         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 921         if (!skb)
 922                 return;
 923
 924         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 925         if (powersave)
 926                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 927
 928         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 929                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 930
 931         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 932                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 933
 934         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 935                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 936
 937         ieee80211_tx_skb(sdata, skb);
 938 }
 939
 940 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 941                                           struct ieee80211_sub_if_data *sdata)
 942 {
 943         struct sk_buff *skb;
 944         struct ieee80211_hdr *nullfunc;
 945         __le16 fc;
 946
 947         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 948                 return;
 949
 950         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 951         if (!skb)
 952                 return;
 953
 954         skb_reserve(skb, local->hw.extra_tx_headroom);
 955
 956         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 957         memset(nullfunc, 0, 30);
 958         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 959                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 960         nullfunc->frame_control = fc;
 961         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 962         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 963         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 964         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 965
 966         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 967         ieee80211_tx_skb(sdata, skb);
 968 }
 969
 970 /* spectrum management related things */
 971 static void ieee80211_chswitch_work(struct work_struct *work)
 972 {
 973         struct ieee80211_sub_if_data *sdata =
 974                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 975         struct ieee80211_local *local = sdata->local;
 976         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 977         int ret;
 978
 979         if (!ieee80211_sdata_running(sdata))
 980                 return;
 981
 982         sdata_lock(sdata);
 983         mutex_lock(&local->mtx);
 984         mutex_lock(&local->chanctx_mtx);
 985
 986         if (!ifmgd->associated)
 987                 goto out;
 988
 989         if (!sdata->vif.csa_active)
 990                 goto out;
 991
 992         /*
 993          * using reservation isn't immediate as it may be deferred until later
 994          * with multi-vif. once reservation is complete it will re-schedule the
 995          * work with no reserved_chanctx so verify chandef to check if it
 996          * completed successfully
 997          */
 998
 999         if (sdata->reserved_chanctx) {
1000                 /*
1001                  * with multi-vif csa driver may call ieee80211_csa_finish()
1002                  * many times while waiting for other interfaces to use their
1003                  * reservations
1004                  */
1005                 if (sdata->reserved_ready)
1006                         goto out;
1007
1008                 ret = ieee80211_vif_use_reserved_context(sdata);
1009                 if (ret) {
1010                         sdata_info(sdata,
1011                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1012                                    ret);
1013                         ieee80211_queue_work(&sdata->local->hw,
1014                                              &ifmgd->csa_connection_drop_work);
1015                         goto out;
1016                 }
1017
1018                 goto out;
1019         }
1020
1021         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1022                                         &sdata->csa_chandef)) {
1023                 sdata_info(sdata,
1024                            "failed to finalize channel switch, disconnecting\n");
1025                 ieee80211_queue_work(&sdata->local->hw,
1026                                      &ifmgd->csa_connection_drop_work);
1027                 goto out;
1028         }
1029
1030         /* XXX: shouldn't really modify cfg80211-owned data! */
1031         ifmgd->associated->channel = sdata->csa_chandef.chan;
1032
1033         ifmgd->csa_waiting_bcn = true;
1034
1035         ieee80211_sta_reset_beacon_monitor(sdata);
1036         ieee80211_sta_reset_conn_monitor(sdata);
1037
1038 out:
1039         mutex_unlock(&local->chanctx_mtx);
1040         mutex_unlock(&local->mtx);
1041         sdata_unlock(sdata);
1042 }
1043
1044 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1045 {
1046         struct ieee80211_local *local = sdata->local;
1047         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1048         int ret;
1049
1050         sdata_assert_lock(sdata);
1051
1052         WARN_ON(!sdata->vif.csa_active);
1053
1054         if (sdata->csa_block_tx) {
1055                 ieee80211_wake_vif_queues(local, sdata,
1056                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1057                 sdata->csa_block_tx = false;
1058         }
1059
1060         sdata->vif.csa_active = false;
1061         ifmgd->csa_waiting_bcn = false;
1062
1063         ret = drv_post_channel_switch(sdata);
1064         if (ret) {
1065                 sdata_info(sdata,
1066                            "driver post channel switch failed, disconnecting\n");
1067                 ieee80211_queue_work(&local->hw,
1068                                      &ifmgd->csa_connection_drop_work);
1069                 return;
1070         }
1071
1072         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1073 }
1074
1075 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1076 {
1077         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1078         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1079
1080         trace_api_chswitch_done(sdata, success);
1081         if (!success) {
1082                 sdata_info(sdata,
1083                            "driver channel switch failed, disconnecting\n");
1084                 ieee80211_queue_work(&sdata->local->hw,
1085                                      &ifmgd->csa_connection_drop_work);
1086         } else {
1087                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1088         }
1089 }
1090 EXPORT_SYMBOL(ieee80211_chswitch_done);
1091
1092 static void ieee80211_chswitch_timer(unsigned long data)
1093 {
1094         struct ieee80211_sub_if_data *sdata =
1095                 (struct ieee80211_sub_if_data *) data;
1096
1097         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1098 }
1099
1100 static void
1101 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1102                                  u64 timestamp, u32 device_timestamp,
1103                                  struct ieee802_11_elems *elems,
1104                                  bool beacon)
1105 {
1106         struct ieee80211_local *local = sdata->local;
1107         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1108         struct cfg80211_bss *cbss = ifmgd->associated;
1109         struct ieee80211_chanctx_conf *conf;
1110         struct ieee80211_chanctx *chanctx;
1111         enum nl80211_band current_band;
1112         struct ieee80211_csa_ie csa_ie;
1113         struct ieee80211_channel_switch ch_switch;
1114         int res;
1115
1116         sdata_assert_lock(sdata);
1117
1118         if (!cbss)
1119                 return;
1120
1121         if (local->scanning)
1122                 return;
1123
1124         /* disregard subsequent announcements if we are already processing */
1125         if (sdata->vif.csa_active)
1126                 return;
1127
1128         current_band = cbss->channel->band;
1129         memset(&csa_ie, 0, sizeof(csa_ie));
1130         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1131                                            ifmgd->flags,
1132                                            ifmgd->associated->bssid, &csa_ie);
1133         if (res < 0)
1134                 ieee80211_queue_work(&local->hw,
1135                                      &ifmgd->csa_connection_drop_work);
1136         if (res)
1137                 return;
1138
1139         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1140                                      IEEE80211_CHAN_DISABLED)) {
1141                 sdata_info(sdata,
1142                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1143                            ifmgd->associated->bssid,
1144                            csa_ie.chandef.chan->center_freq,
1145                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1146                            csa_ie.chandef.center_freq2);
1147                 ieee80211_queue_work(&local->hw,
1148                                      &ifmgd->csa_connection_drop_work);
1149                 return;
1150         }
1151
1152         if (cfg80211_chandef_identical(&csa_ie.chandef,
1153                                        &sdata->vif.bss_conf.chandef)) {
1154                 if (ifmgd->csa_ignored_same_chan)
1155                         return;
1156                 sdata_info(sdata,
1157                            "AP %pM tries to chanswitch to same channel, ignore\n",
1158                            ifmgd->associated->bssid);
1159                 ifmgd->csa_ignored_same_chan = true;
1160                 return;
1161         }
1162
1163         /*
1164          * Drop all TDLS peers - either we disconnect or move to a different
1165          * channel from this point on. There's no telling what our peer will do.
1166          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1167          * have an incompatible wider chandef.
1168          */
1169         ieee80211_teardown_tdls_peers(sdata);
1170
1171         mutex_lock(&local->mtx);
1172         mutex_lock(&local->chanctx_mtx);
1173         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1174                                          lockdep_is_held(&local->chanctx_mtx));
1175         if (!conf) {
1176                 sdata_info(sdata,
1177                            "no channel context assigned to vif?, disconnecting\n");
1178                 goto drop_connection;
1179         }
1180
1181         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1182
1183         if (local->use_chanctx &&
1184             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1185                 sdata_info(sdata,
1186                            "driver doesn't support chan-switch with channel contexts\n");
1187                 goto drop_connection;
1188         }
1189
1190         ch_switch.timestamp = timestamp;
1191         ch_switch.device_timestamp = device_timestamp;
1192         ch_switch.block_tx = csa_ie.mode;
1193         ch_switch.chandef = csa_ie.chandef;
1194         ch_switch.count = csa_ie.count;
1195
1196         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1197                 sdata_info(sdata,
1198                            "preparing for channel switch failed, disconnecting\n");
1199                 goto drop_connection;
1200         }
1201
1202         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1203                                             chanctx->mode, false);
1204         if (res) {
1205                 sdata_info(sdata,
1206                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1207                            res);
1208                 goto drop_connection;
1209         }
1210         mutex_unlock(&local->chanctx_mtx);
1211
1212         sdata->vif.csa_active = true;
1213         sdata->csa_chandef = csa_ie.chandef;
1214         sdata->csa_block_tx = csa_ie.mode;
1215         ifmgd->csa_ignored_same_chan = false;
1216
1217         if (sdata->csa_block_tx)
1218                 ieee80211_stop_vif_queues(local, sdata,
1219                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1220         mutex_unlock(&local->mtx);
1221
1222         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1223                                           csa_ie.count);
1224
1225         if (local->ops->channel_switch) {
1226                 /* use driver's channel switch callback */
1227                 drv_channel_switch(local, sdata, &ch_switch);
1228                 return;
1229         }
1230
1231         /* channel switch handled in software */
1232         if (csa_ie.count <= 1)
1233                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1234         else
1235                 mod_timer(&ifmgd->chswitch_timer,
1236                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1237                                          cbss->beacon_interval));
1238         return;
1239  drop_connection:
1240         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1241         mutex_unlock(&local->chanctx_mtx);
1242         mutex_unlock(&local->mtx);
1243 }
1244
1245 static bool
1246 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1247                                  struct ieee80211_channel *channel,
1248                                  const u8 *country_ie, u8 country_ie_len,
1249                                  const u8 *pwr_constr_elem,
1250                                  int *chan_pwr, int *pwr_reduction)
1251 {
1252         struct ieee80211_country_ie_triplet *triplet;
1253         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1254         int i, chan_increment;
1255         bool have_chan_pwr = false;
1256
1257         /* Invalid IE */
1258         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1259                 return false;
1260
1261         triplet = (void *)(country_ie + 3);
1262         country_ie_len -= 3;
1263
1264         switch (channel->band) {
1265         default:
1266                 WARN_ON_ONCE(1);
1267                 /* fall through */
1268         case NL80211_BAND_2GHZ:
1269         case NL80211_BAND_60GHZ:
1270                 chan_increment = 1;
1271                 break;
1272         case NL80211_BAND_5GHZ:
1273                 chan_increment = 4;
1274                 break;
1275         }
1276
1277         /* find channel */
1278         while (country_ie_len >= 3) {
1279                 u8 first_channel = triplet->chans.first_channel;
1280
1281                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1282                         goto next;
1283
1284                 for (i = 0; i < triplet->chans.num_channels; i++) {
1285                         if (first_channel + i * chan_increment == chan) {
1286                                 have_chan_pwr = true;
1287                                 *chan_pwr = triplet->chans.max_power;
1288                                 break;
1289                         }
1290                 }
1291                 if (have_chan_pwr)
1292                         break;
1293
1294  next:
1295                 triplet++;
1296                 country_ie_len -= 3;
1297         }
1298
1299         if (have_chan_pwr && pwr_constr_elem)
1300                 *pwr_reduction = *pwr_constr_elem;
1301         else
1302                 *pwr_reduction = 0;
1303
1304         return have_chan_pwr;
1305 }
1306
1307 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1308                                       struct ieee80211_channel *channel,
1309                                       const u8 *cisco_dtpc_ie,
1310                                       int *pwr_level)
1311 {
1312         /* From practical testing, the first data byte of the DTPC element
1313          * seems to contain the requested dBm level, and the CLI on Cisco
1314          * APs clearly state the range is -127 to 127 dBm, which indicates
1315          * a signed byte, although it seemingly never actually goes negative.
1316          * The other byte seems to always be zero.
1317          */
1318         *pwr_level = (__s8)cisco_dtpc_ie[4];
1319 }
1320
1321 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1322                                        struct ieee80211_channel *channel,
1323                                        struct ieee80211_mgmt *mgmt,
1324                                        const u8 *country_ie, u8 country_ie_len,
1325                                        const u8 *pwr_constr_ie,
1326                                        const u8 *cisco_dtpc_ie)
1327 {
1328         bool has_80211h_pwr = false, has_cisco_pwr = false;
1329         int chan_pwr = 0, pwr_reduction_80211h = 0;
1330         int pwr_level_cisco, pwr_level_80211h;
1331         int new_ap_level;
1332         __le16 capab = mgmt->u.probe_resp.capab_info;
1333
1334         if (country_ie &&
1335             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1336              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1337                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1338                         sdata, channel, country_ie, country_ie_len,
1339                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1340                 pwr_level_80211h =
1341                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1342         }
1343
1344         if (cisco_dtpc_ie) {
1345                 ieee80211_find_cisco_dtpc(
1346                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1347                 has_cisco_pwr = true;
1348         }
1349
1350         if (!has_80211h_pwr && !has_cisco_pwr)
1351                 return 0;
1352
1353         /* If we have both 802.11h and Cisco DTPC, apply both limits
1354          * by picking the smallest of the two power levels advertised.
1355          */
1356         if (has_80211h_pwr &&
1357             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1358                 new_ap_level = pwr_level_80211h;
1359
1360                 if (sdata->ap_power_level == new_ap_level)
1361                         return 0;
1362
1363                 sdata_dbg(sdata,
1364                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1365                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1366                           sdata->u.mgd.bssid);
1367         } else {  /* has_cisco_pwr is always true here. */
1368                 new_ap_level = pwr_level_cisco;
1369
1370                 if (sdata->ap_power_level == new_ap_level)
1371                         return 0;
1372
1373                 sdata_dbg(sdata,
1374                           "Limiting TX power to %d dBm as advertised by %pM\n",
1375                           pwr_level_cisco, sdata->u.mgd.bssid);
1376         }
1377
1378         sdata->ap_power_level = new_ap_level;
1379         if (__ieee80211_recalc_txpower(sdata))
1380                 return BSS_CHANGED_TXPOWER;
1381         return 0;
1382 }
1383
1384 /* powersave */
1385 static void ieee80211_enable_ps(struct ieee80211_local *local,
1386                                 struct ieee80211_sub_if_data *sdata)
1387 {
1388         struct ieee80211_conf *conf = &local->hw.conf;
1389
1390         /*
1391          * If we are scanning right now then the parameters will
1392          * take effect when scan finishes.
1393          */
1394         if (local->scanning)
1395                 return;
1396
1397         if (conf->dynamic_ps_timeout > 0 &&
1398             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1399                 mod_timer(&local->dynamic_ps_timer, jiffies +
1400                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1401         } else {
1402                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1403                         ieee80211_send_nullfunc(local, sdata, true);
1404
1405                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1406                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1407                         return;
1408
1409                 conf->flags |= IEEE80211_CONF_PS;
1410                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1411         }
1412 }
1413
1414 static void ieee80211_change_ps(struct ieee80211_local *local)
1415 {
1416         struct ieee80211_conf *conf = &local->hw.conf;
1417
1418         if (local->ps_sdata) {
1419                 ieee80211_enable_ps(local, local->ps_sdata);
1420         } else if (conf->flags & IEEE80211_CONF_PS) {
1421                 conf->flags &= ~IEEE80211_CONF_PS;
1422                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1423                 del_timer_sync(&local->dynamic_ps_timer);
1424                 cancel_work_sync(&local->dynamic_ps_enable_work);
1425         }
1426 }
1427
1428 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1429 {
1430         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1431         struct sta_info *sta = NULL;
1432         bool authorized = false;
1433
1434         if (!mgd->powersave)
1435                 return false;
1436
1437         if (mgd->broken_ap)
1438                 return false;
1439
1440         if (!mgd->associated)
1441                 return false;
1442
1443         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1444                 return false;
1445
1446         if (!mgd->have_beacon)
1447                 return false;
1448
1449         rcu_read_lock();
1450         sta = sta_info_get(sdata, mgd->bssid);
1451         if (sta)
1452                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1453         rcu_read_unlock();
1454
1455         return authorized;
1456 }
1457
1458 /* need to hold RTNL or interface lock */
1459 void ieee80211_recalc_ps(struct ieee80211_local *local)
1460 {
1461         struct ieee80211_sub_if_data *sdata, *found = NULL;
1462         int count = 0;
1463         int timeout;
1464
1465         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1466                 local->ps_sdata = NULL;
1467                 return;
1468         }
1469
1470         list_for_each_entry(sdata, &local->interfaces, list) {
1471                 if (!ieee80211_sdata_running(sdata))
1472                         continue;
1473                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1474                         /* If an AP vif is found, then disable PS
1475                          * by setting the count to zero thereby setting
1476                          * ps_sdata to NULL.
1477                          */
1478                         count = 0;
1479                         break;
1480                 }
1481                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1482                         continue;
1483                 found = sdata;
1484                 count++;
1485         }
1486
1487         if (count == 1 && ieee80211_powersave_allowed(found)) {
1488                 u8 dtimper = found->u.mgd.dtim_period;
1489
1490                 timeout = local->dynamic_ps_forced_timeout;
1491                 if (timeout < 0)
1492                         timeout = 100;
1493                 local->hw.conf.dynamic_ps_timeout = timeout;
1494
1495                 /* If the TIM IE is invalid, pretend the value is 1 */
1496                 if (!dtimper)
1497                         dtimper = 1;
1498
1499                 local->hw.conf.ps_dtim_period = dtimper;
1500                 local->ps_sdata = found;
1501         } else {
1502                 local->ps_sdata = NULL;
1503         }
1504
1505         ieee80211_change_ps(local);
1506 }
1507
1508 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1509 {
1510         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1511
1512         if (sdata->vif.bss_conf.ps != ps_allowed) {
1513                 sdata->vif.bss_conf.ps = ps_allowed;
1514                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1515         }
1516 }
1517
1518 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1519 {
1520         struct ieee80211_local *local =
1521                 container_of(work, struct ieee80211_local,
1522                              dynamic_ps_disable_work);
1523
1524         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1525                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1526                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1527         }
1528
1529         ieee80211_wake_queues_by_reason(&local->hw,
1530                                         IEEE80211_MAX_QUEUE_MAP,
1531                                         IEEE80211_QUEUE_STOP_REASON_PS,
1532                                         false);
1533 }
1534
1535 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1536 {
1537         struct ieee80211_local *local =
1538                 container_of(work, struct ieee80211_local,
1539                              dynamic_ps_enable_work);
1540         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1541         struct ieee80211_if_managed *ifmgd;
1542         unsigned long flags;
1543         int q;
1544
1545         /* can only happen when PS was just disabled anyway */
1546         if (!sdata)
1547                 return;
1548
1549         ifmgd = &sdata->u.mgd;
1550
1551         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1552                 return;
1553
1554         if (local->hw.conf.dynamic_ps_timeout > 0) {
1555                 /* don't enter PS if TX frames are pending */
1556                 if (drv_tx_frames_pending(local)) {
1557                         mod_timer(&local->dynamic_ps_timer, jiffies +
1558                                   msecs_to_jiffies(
1559                                   local->hw.conf.dynamic_ps_timeout));
1560                         return;
1561                 }
1562
1563                 /*
1564                  * transmission can be stopped by others which leads to
1565                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1566                  * is not the actual idle state.
1567                  */
1568                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1569                 for (q = 0; q < local->hw.queues; q++) {
1570                         if (local->queue_stop_reasons[q]) {
1571                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1572                                                        flags);
1573                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1574                                           msecs_to_jiffies(
1575                                           local->hw.conf.dynamic_ps_timeout));
1576                                 return;
1577                         }
1578                 }
1579                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1580         }
1581
1582         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1583             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1584                 if (drv_tx_frames_pending(local)) {
1585                         mod_timer(&local->dynamic_ps_timer, jiffies +
1586                                   msecs_to_jiffies(
1587                                   local->hw.conf.dynamic_ps_timeout));
1588                 } else {
1589                         ieee80211_send_nullfunc(local, sdata, true);
1590                         /* Flush to get the tx status of nullfunc frame */
1591                         ieee80211_flush_queues(local, sdata, false);
1592                 }
1593         }
1594
1595         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1596               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1597             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1598                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1599                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1600                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1601         }
1602 }
1603
1604 void ieee80211_dynamic_ps_timer(unsigned long data)
1605 {
1606         struct ieee80211_local *local = (void *) data;
1607
1608         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1609 }
1610
1611 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1612 {
1613         struct delayed_work *delayed_work = to_delayed_work(work);
1614         struct ieee80211_sub_if_data *sdata =
1615                 container_of(delayed_work, struct ieee80211_sub_if_data,
1616                              dfs_cac_timer_work);
1617         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1618
1619         mutex_lock(&sdata->local->mtx);
1620         if (sdata->wdev.cac_started) {
1621                 ieee80211_vif_release_channel(sdata);
1622                 cfg80211_cac_event(sdata->dev, &chandef,
1623                                    NL80211_RADAR_CAC_FINISHED,
1624                                    GFP_KERNEL);
1625         }
1626         mutex_unlock(&sdata->local->mtx);
1627 }
1628
1629 static bool
1630 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1631 {
1632         struct ieee80211_local *local = sdata->local;
1633         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1634         bool ret = false;
1635         int ac;
1636
1637         if (local->hw.queues < IEEE80211_NUM_ACS)
1638                 return false;
1639
1640         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1641                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1642                 int non_acm_ac;
1643                 unsigned long now = jiffies;
1644
1645                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1646                     tx_tspec->admitted_time &&
1647                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1648                         tx_tspec->consumed_tx_time = 0;
1649                         tx_tspec->time_slice_start = now;
1650
1651                         if (tx_tspec->downgraded)
1652                                 tx_tspec->action =
1653                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1654                 }
1655
1656                 switch (tx_tspec->action) {
1657                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1658                         /* take the original parameters */
1659                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1660                                 sdata_err(sdata,
1661                                           "failed to set TX queue parameters for queue %d\n",
1662                                           ac);
1663                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1664                         tx_tspec->downgraded = false;
1665                         ret = true;
1666                         break;
1667                 case TX_TSPEC_ACTION_DOWNGRADE:
1668                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1669                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1670                                 ret = true;
1671                                 break;
1672                         }
1673                         /* downgrade next lower non-ACM AC */
1674                         for (non_acm_ac = ac + 1;
1675                              non_acm_ac < IEEE80211_NUM_ACS;
1676                              non_acm_ac++)
1677                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1678                                         break;
1679                         /* Usually the loop will result in using BK even if it
1680                          * requires admission control, but such a configuration
1681                          * makes no sense and we have to transmit somehow - the
1682                          * AC selection does the same thing.
1683                          * If we started out trying to downgrade from BK, then
1684                          * the extra condition here might be needed.
1685                          */
1686                         if (non_acm_ac >= IEEE80211_NUM_ACS)
1687                                 non_acm_ac = IEEE80211_AC_BK;
1688                         if (drv_conf_tx(local, sdata, ac,
1689                                         &sdata->tx_conf[non_acm_ac]))
1690                                 sdata_err(sdata,
1691                                           "failed to set TX queue parameters for queue %d\n",
1692                                           ac);
1693                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1694                         ret = true;
1695                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1696                                 tx_tspec->time_slice_start + HZ - now + 1);
1697                         break;
1698                 case TX_TSPEC_ACTION_NONE:
1699                         /* nothing now */
1700                         break;
1701                 }
1702         }
1703
1704         return ret;
1705 }
1706
1707 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1708 {
1709         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1710                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1711 }
1712
1713 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1714 {
1715         struct ieee80211_sub_if_data *sdata;
1716
1717         sdata = container_of(work, struct ieee80211_sub_if_data,
1718                              u.mgd.tx_tspec_wk.work);
1719         ieee80211_sta_handle_tspec_ac_params(sdata);
1720 }
1721
1722 /* MLME */
1723 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1724                                      struct ieee80211_sub_if_data *sdata,
1725                                      const u8 *wmm_param, size_t wmm_param_len)
1726 {
1727         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1728         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1729         size_t left;
1730         int count, ac;
1731         const u8 *pos;
1732         u8 uapsd_queues = 0;
1733
1734         if (!local->ops->conf_tx)
1735                 return false;
1736
1737         if (local->hw.queues < IEEE80211_NUM_ACS)
1738                 return false;
1739
1740         if (!wmm_param)
1741                 return false;
1742
1743         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1744                 return false;
1745
1746         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1747                 uapsd_queues = ifmgd->uapsd_queues;
1748
1749         count = wmm_param[6] & 0x0f;
1750         if (count == ifmgd->wmm_last_param_set)
1751                 return false;
1752         ifmgd->wmm_last_param_set = count;
1753
1754         pos = wmm_param + 8;
1755         left = wmm_param_len - 8;
1756
1757         memset(&params, 0, sizeof(params));
1758
1759         sdata->wmm_acm = 0;
1760         for (; left >= 4; left -= 4, pos += 4) {
1761                 int aci = (pos[0] >> 5) & 0x03;
1762                 int acm = (pos[0] >> 4) & 0x01;
1763                 bool uapsd = false;
1764
1765                 switch (aci) {
1766                 case 1: /* AC_BK */
1767                         ac = IEEE80211_AC_BK;
1768                         if (acm)
1769                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1770                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1771                                 uapsd = true;
1772                         break;
1773                 case 2: /* AC_VI */
1774                         ac = IEEE80211_AC_VI;
1775                         if (acm)
1776                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1777                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1778                                 uapsd = true;
1779                         break;
1780                 case 3: /* AC_VO */
1781                         ac = IEEE80211_AC_VO;
1782                         if (acm)
1783                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1784                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1785                                 uapsd = true;
1786                         break;
1787                 case 0: /* AC_BE */
1788                 default:
1789                         ac = IEEE80211_AC_BE;
1790                         if (acm)
1791                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1792                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1793                                 uapsd = true;
1794                         break;
1795                 }
1796
1797                 params[ac].aifs = pos[0] & 0x0f;
1798
1799                 if (params[ac].aifs < 2) {
1800                         sdata_info(sdata,
1801                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1802                                    params[ac].aifs, aci);
1803                         params[ac].aifs = 2;
1804                 }
1805                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1806                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1807                 params[ac].txop = get_unaligned_le16(pos + 2);
1808                 params[ac].acm = acm;
1809                 params[ac].uapsd = uapsd;
1810
1811                 if (params[ac].cw_min > params[ac].cw_max) {
1812                         sdata_info(sdata,
1813                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1814                                    params[ac].cw_min, params[ac].cw_max, aci);
1815                         return false;
1816                 }
1817         }
1818
1819         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1820                 mlme_dbg(sdata,
1821                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1822                          ac, params[ac].acm,
1823                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1824                          params[ac].txop, params[ac].uapsd,
1825                          ifmgd->tx_tspec[ac].downgraded);
1826                 sdata->tx_conf[ac] = params[ac];
1827                 if (!ifmgd->tx_tspec[ac].downgraded &&
1828                     drv_conf_tx(local, sdata, ac, &params[ac]))
1829                         sdata_err(sdata,
1830                                   "failed to set TX queue parameters for AC %d\n",
1831                                   ac);
1832         }
1833
1834         /* enable WMM or activate new settings */
1835         sdata->vif.bss_conf.qos = true;
1836         return true;
1837 }
1838
1839 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1840 {
1841         lockdep_assert_held(&sdata->local->mtx);
1842
1843         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1844         ieee80211_run_deferred_scan(sdata->local);
1845 }
1846
1847 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1848 {
1849         mutex_lock(&sdata->local->mtx);
1850         __ieee80211_stop_poll(sdata);
1851         mutex_unlock(&sdata->local->mtx);
1852 }
1853
1854 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1855                                            u16 capab, bool erp_valid, u8 erp)
1856 {
1857         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1858         u32 changed = 0;
1859         bool use_protection;
1860         bool use_short_preamble;
1861         bool use_short_slot;
1862
1863         if (erp_valid) {
1864                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1865                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1866         } else {
1867                 use_protection = false;
1868                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1869         }
1870
1871         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1872         if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_5GHZ)
1873                 use_short_slot = true;
1874
1875         if (use_protection != bss_conf->use_cts_prot) {
1876                 bss_conf->use_cts_prot = use_protection;
1877                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1878         }
1879
1880         if (use_short_preamble != bss_conf->use_short_preamble) {
1881                 bss_conf->use_short_preamble = use_short_preamble;
1882                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1883         }
1884
1885         if (use_short_slot != bss_conf->use_short_slot) {
1886                 bss_conf->use_short_slot = use_short_slot;
1887                 changed |= BSS_CHANGED_ERP_SLOT;
1888         }
1889
1890         return changed;
1891 }
1892
1893 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1894                                      struct cfg80211_bss *cbss,
1895                                      u32 bss_info_changed)
1896 {
1897         struct ieee80211_bss *bss = (void *)cbss->priv;
1898         struct ieee80211_local *local = sdata->local;
1899         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1900
1901         bss_info_changed |= BSS_CHANGED_ASSOC;
1902         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1903                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1904
1905         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1906                 beacon_loss_count * bss_conf->beacon_int));
1907
1908         sdata->u.mgd.associated = cbss;
1909         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1910
1911         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1912
1913         if (sdata->vif.p2p ||
1914             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1915                 const struct cfg80211_bss_ies *ies;
1916
1917                 rcu_read_lock();
1918                 ies = rcu_dereference(cbss->ies);
1919                 if (ies) {
1920                         int ret;
1921
1922                         ret = cfg80211_get_p2p_attr(
1923                                         ies->data, ies->len,
1924                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1925                                         (u8 *) &bss_conf->p2p_noa_attr,
1926                                         sizeof(bss_conf->p2p_noa_attr));
1927                         if (ret >= 2) {
1928                                 sdata->u.mgd.p2p_noa_index =
1929                                         bss_conf->p2p_noa_attr.index;
1930                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1931                         }
1932                 }
1933                 rcu_read_unlock();
1934         }
1935
1936         /* just to be sure */
1937         ieee80211_stop_poll(sdata);
1938
1939         ieee80211_led_assoc(local, 1);
1940
1941         if (sdata->u.mgd.have_beacon) {
1942                 /*
1943                  * If the AP is buggy we may get here with no DTIM period
1944                  * known, so assume it's 1 which is the only safe assumption
1945                  * in that case, although if the TIM IE is broken powersave
1946                  * probably just won't work at all.
1947                  */
1948                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1949                 bss_conf->beacon_rate = bss->beacon_rate;
1950                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1951         } else {
1952                 bss_conf->beacon_rate = NULL;
1953                 bss_conf->dtim_period = 0;
1954         }
1955
1956         bss_conf->assoc = 1;
1957
1958         /* Tell the driver to monitor connection quality (if supported) */
1959         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1960             bss_conf->cqm_rssi_thold)
1961                 bss_info_changed |= BSS_CHANGED_CQM;
1962
1963         /* Enable ARP filtering */
1964         if (bss_conf->arp_addr_cnt)
1965                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1966
1967         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1968
1969         mutex_lock(&local->iflist_mtx);
1970         ieee80211_recalc_ps(local);
1971         mutex_unlock(&local->iflist_mtx);
1972
1973         ieee80211_recalc_smps(sdata);
1974         ieee80211_recalc_ps_vif(sdata);
1975
1976         netif_carrier_on(sdata->dev);
1977 }
1978
1979 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1980                                    u16 stype, u16 reason, bool tx,
1981                                    u8 *frame_buf)
1982 {
1983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1984         struct ieee80211_local *local = sdata->local;
1985         u32 changed = 0;
1986
1987         sdata_assert_lock(sdata);
1988
1989         if (WARN_ON_ONCE(tx && !frame_buf))
1990                 return;
1991
1992         if (WARN_ON(!ifmgd->associated))
1993                 return;
1994
1995         ieee80211_stop_poll(sdata);
1996
1997         ifmgd->associated = NULL;
1998         netif_carrier_off(sdata->dev);
1999
2000         /*
2001          * if we want to get out of ps before disassoc (why?) we have
2002          * to do it before sending disassoc, as otherwise the null-packet
2003          * won't be valid.
2004          */
2005         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2006                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2007                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2008         }
2009         local->ps_sdata = NULL;
2010
2011         /* disable per-vif ps */
2012         ieee80211_recalc_ps_vif(sdata);
2013
2014         /* make sure ongoing transmission finishes */
2015         synchronize_net();
2016
2017         /*
2018          * drop any frame before deauth/disassoc, this can be data or
2019          * management frame. Since we are disconnecting, we should not
2020          * insist sending these frames which can take time and delay
2021          * the disconnection and possible the roaming.
2022          */
2023         if (tx)
2024                 ieee80211_flush_queues(local, sdata, true);
2025
2026         /* deauthenticate/disassociate now */
2027         if (tx || frame_buf)
2028                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2029                                                reason, tx, frame_buf);
2030
2031         /* flush out frame - make sure the deauth was actually sent */
2032         if (tx)
2033                 ieee80211_flush_queues(local, sdata, false);
2034
2035         /* clear bssid only after building the needed mgmt frames */
2036         eth_zero_addr(ifmgd->bssid);
2037
2038         /* remove AP and TDLS peers */
2039         sta_info_flush(sdata);
2040
2041         /* finally reset all BSS / config parameters */
2042         changed |= ieee80211_reset_erp_info(sdata);
2043
2044         ieee80211_led_assoc(local, 0);
2045         changed |= BSS_CHANGED_ASSOC;
2046         sdata->vif.bss_conf.assoc = false;
2047
2048         ifmgd->p2p_noa_index = -1;
2049         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2050                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2051
2052         /* on the next assoc, re-program HT/VHT parameters */
2053         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2054         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2055         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2056         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2057
2058         /* reset MU-MIMO ownership and group data */
2059         memset(sdata->vif.bss_conf.mu_group.membership, 0,
2060                sizeof(sdata->vif.bss_conf.mu_group.membership));
2061         memset(sdata->vif.bss_conf.mu_group.position, 0,
2062                sizeof(sdata->vif.bss_conf.mu_group.position));
2063         changed |= BSS_CHANGED_MU_GROUPS;
2064         sdata->vif.mu_mimo_owner = false;
2065
2066         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2067
2068         del_timer_sync(&local->dynamic_ps_timer);
2069         cancel_work_sync(&local->dynamic_ps_enable_work);
2070
2071         /* Disable ARP filtering */
2072         if (sdata->vif.bss_conf.arp_addr_cnt)
2073                 changed |= BSS_CHANGED_ARP_FILTER;
2074
2075         sdata->vif.bss_conf.qos = false;
2076         changed |= BSS_CHANGED_QOS;
2077
2078         /* The BSSID (not really interesting) and HT changed */
2079         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2080         ieee80211_bss_info_change_notify(sdata, changed);
2081
2082         /* disassociated - set to defaults now */
2083         ieee80211_set_wmm_default(sdata, false, false);
2084
2085         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2086         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2087         del_timer_sync(&sdata->u.mgd.timer);
2088         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2089
2090         sdata->vif.bss_conf.dtim_period = 0;
2091         sdata->vif.bss_conf.beacon_rate = NULL;
2092
2093         ifmgd->have_beacon = false;
2094
2095         ifmgd->flags = 0;
2096         mutex_lock(&local->mtx);
2097         ieee80211_vif_release_channel(sdata);
2098
2099         sdata->vif.csa_active = false;
2100         ifmgd->csa_waiting_bcn = false;
2101         ifmgd->csa_ignored_same_chan = false;
2102         if (sdata->csa_block_tx) {
2103                 ieee80211_wake_vif_queues(local, sdata,
2104                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2105                 sdata->csa_block_tx = false;
2106         }
2107         mutex_unlock(&local->mtx);
2108
2109         /* existing TX TSPEC sessions no longer exist */
2110         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2111         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2112
2113         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2114 }
2115
2116 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2117                              struct ieee80211_hdr *hdr)
2118 {
2119         /*
2120          * We can postpone the mgd.timer whenever receiving unicast frames
2121          * from AP because we know that the connection is working both ways
2122          * at that time. But multicast frames (and hence also beacons) must
2123          * be ignored here, because we need to trigger the timer during
2124          * data idle periods for sending the periodic probe request to the
2125          * AP we're connected to.
2126          */
2127         if (is_multicast_ether_addr(hdr->addr1))
2128                 return;
2129
2130         ieee80211_sta_reset_conn_monitor(sdata);
2131 }
2132
2133 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2134 {
2135         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2136         struct ieee80211_local *local = sdata->local;
2137
2138         mutex_lock(&local->mtx);
2139         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2140                 goto out;
2141
2142         __ieee80211_stop_poll(sdata);
2143
2144         mutex_lock(&local->iflist_mtx);
2145         ieee80211_recalc_ps(local);
2146         mutex_unlock(&local->iflist_mtx);
2147
2148         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2149                 goto out;
2150
2151         /*
2152          * We've received a probe response, but are not sure whether
2153          * we have or will be receiving any beacons or data, so let's
2154          * schedule the timers again, just in case.
2155          */
2156         ieee80211_sta_reset_beacon_monitor(sdata);
2157
2158         mod_timer(&ifmgd->conn_mon_timer,
2159                   round_jiffies_up(jiffies +
2160                                    IEEE80211_CONNECTION_IDLE_TIME));
2161 out:
2162         mutex_unlock(&local->mtx);
2163 }
2164
2165 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2166                                            struct ieee80211_hdr *hdr,
2167                                            u16 tx_time)
2168 {
2169         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2170         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2171         int ac = ieee80211_ac_from_tid(tid);
2172         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2173         unsigned long now = jiffies;
2174
2175         if (likely(!tx_tspec->admitted_time))
2176                 return;
2177
2178         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2179                 tx_tspec->consumed_tx_time = 0;
2180                 tx_tspec->time_slice_start = now;
2181
2182                 if (tx_tspec->downgraded) {
2183                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2184                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2185                 }
2186         }
2187
2188         if (tx_tspec->downgraded)
2189                 return;
2190
2191         tx_tspec->consumed_tx_time += tx_time;
2192
2193         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2194                 tx_tspec->downgraded = true;
2195                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2196                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2197         }
2198 }
2199
2200 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2201                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2202 {
2203         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2204
2205         if (!ieee80211_is_data(hdr->frame_control))
2206             return;
2207
2208         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2209             sdata->u.mgd.probe_send_count > 0) {
2210                 if (ack)
2211                         ieee80211_sta_reset_conn_monitor(sdata);
2212                 else
2213                         sdata->u.mgd.nullfunc_failed = true;
2214                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2215                 return;
2216         }
2217
2218         if (ack)
2219                 ieee80211_sta_reset_conn_monitor(sdata);
2220 }
2221
2222 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2223 {
2224         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2225         const u8 *ssid;
2226         u8 *dst = ifmgd->associated->bssid;
2227         u8 unicast_limit = max(1, max_probe_tries - 3);
2228         struct sta_info *sta;
2229
2230         /*
2231          * Try sending broadcast probe requests for the last three
2232          * probe requests after the first ones failed since some
2233          * buggy APs only support broadcast probe requests.
2234          */
2235         if (ifmgd->probe_send_count >= unicast_limit)
2236                 dst = NULL;
2237
2238         /*
2239          * When the hardware reports an accurate Tx ACK status, it's
2240          * better to send a nullfunc frame instead of a probe request,
2241          * as it will kick us off the AP quickly if we aren't associated
2242          * anymore. The timeout will be reset if the frame is ACKed by
2243          * the AP.
2244          */
2245         ifmgd->probe_send_count++;
2246
2247         if (dst) {
2248                 mutex_lock(&sdata->local->sta_mtx);
2249                 sta = sta_info_get(sdata, dst);
2250                 if (!WARN_ON(!sta))
2251                         ieee80211_check_fast_rx(sta);
2252                 mutex_unlock(&sdata->local->sta_mtx);
2253         }
2254
2255         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2256                 ifmgd->nullfunc_failed = false;
2257                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2258         } else {
2259                 int ssid_len;
2260
2261                 rcu_read_lock();
2262                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2263                 if (WARN_ON_ONCE(ssid == NULL))
2264                         ssid_len = 0;
2265                 else
2266                         ssid_len = ssid[1];
2267
2268                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2269                                          ssid + 2, ssid_len, NULL,
2270                                          0, (u32) -1, true, 0,
2271                                          ifmgd->associated->channel, false);
2272                 rcu_read_unlock();
2273         }
2274
2275         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2276         run_again(sdata, ifmgd->probe_timeout);
2277 }
2278
2279 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2280                                    bool beacon)
2281 {
2282         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2283         bool already = false;
2284
2285         if (!ieee80211_sdata_running(sdata))
2286                 return;
2287
2288         sdata_lock(sdata);
2289
2290         if (!ifmgd->associated)
2291                 goto out;
2292
2293         mutex_lock(&sdata->local->mtx);
2294
2295         if (sdata->local->tmp_channel || sdata->local->scanning) {
2296                 mutex_unlock(&sdata->local->mtx);
2297                 goto out;
2298         }
2299
2300         if (beacon) {
2301                 mlme_dbg_ratelimited(sdata,
2302                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2303                                      beacon_loss_count);
2304
2305                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2306         }
2307
2308         /*
2309          * The driver/our work has already reported this event or the
2310          * connection monitoring has kicked in and we have already sent
2311          * a probe request. Or maybe the AP died and the driver keeps
2312          * reporting until we disassociate...
2313          *
2314          * In either case we have to ignore the current call to this
2315          * function (except for setting the correct probe reason bit)
2316          * because otherwise we would reset the timer every time and
2317          * never check whether we received a probe response!
2318          */
2319         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2320                 already = true;
2321
2322         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2323
2324         mutex_unlock(&sdata->local->mtx);
2325
2326         if (already)
2327                 goto out;
2328
2329         mutex_lock(&sdata->local->iflist_mtx);
2330         ieee80211_recalc_ps(sdata->local);
2331         mutex_unlock(&sdata->local->iflist_mtx);
2332
2333         ifmgd->probe_send_count = 0;
2334         ieee80211_mgd_probe_ap_send(sdata);
2335  out:
2336         sdata_unlock(sdata);
2337 }
2338
2339 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2340                                           struct ieee80211_vif *vif)
2341 {
2342         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2343         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2344         struct cfg80211_bss *cbss;
2345         struct sk_buff *skb;
2346         const u8 *ssid;
2347         int ssid_len;
2348
2349         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2350                 return NULL;
2351
2352         sdata_assert_lock(sdata);
2353
2354         if (ifmgd->associated)
2355                 cbss = ifmgd->associated;
2356         else if (ifmgd->auth_data)
2357                 cbss = ifmgd->auth_data->bss;
2358         else if (ifmgd->assoc_data)
2359                 cbss = ifmgd->assoc_data->bss;
2360         else
2361                 return NULL;
2362
2363         rcu_read_lock();
2364         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2365         if (WARN_ON_ONCE(ssid == NULL))
2366                 ssid_len = 0;
2367         else
2368                 ssid_len = ssid[1];
2369
2370         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2371                                         (u32) -1, cbss->channel,
2372                                         ssid + 2, ssid_len,
2373                                         NULL, 0, true);
2374         rcu_read_unlock();
2375
2376         return skb;
2377 }
2378 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2379
2380 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2381                                         const u8 *buf, size_t len, bool tx,
2382                                         u16 reason)
2383 {
2384         struct ieee80211_event event = {
2385                 .type = MLME_EVENT,
2386                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2387                 .u.mlme.reason = reason,
2388         };
2389
2390         if (tx)
2391                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2392         else
2393                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2394
2395         drv_event_callback(sdata->local, sdata, &event);
2396 }
2397
2398 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2399 {
2400         struct ieee80211_local *local = sdata->local;
2401         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2402         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2403
2404         sdata_lock(sdata);
2405         if (!ifmgd->associated) {
2406                 sdata_unlock(sdata);
2407                 return;
2408         }
2409
2410         /* AP is probably out of range (or not reachable for another reason) so
2411          * remove the bss struct for that AP.
2412          */
2413         cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2414
2415         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2416                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2417                                true, frame_buf);
2418         mutex_lock(&local->mtx);
2419         sdata->vif.csa_active = false;
2420         ifmgd->csa_waiting_bcn = false;
2421         if (sdata->csa_block_tx) {
2422                 ieee80211_wake_vif_queues(local, sdata,
2423                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2424                 sdata->csa_block_tx = false;
2425         }
2426         mutex_unlock(&local->mtx);
2427
2428         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2429                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2430
2431         sdata_unlock(sdata);
2432 }
2433
2434 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2435 {
2436         struct ieee80211_sub_if_data *sdata =
2437                 container_of(work, struct ieee80211_sub_if_data,
2438                              u.mgd.beacon_connection_loss_work);
2439         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2440
2441         if (ifmgd->associated)
2442                 ifmgd->beacon_loss_count++;
2443
2444         if (ifmgd->connection_loss) {
2445                 sdata_info(sdata, "Connection to AP %pM lost\n",
2446                            ifmgd->bssid);
2447                 __ieee80211_disconnect(sdata);
2448         } else {
2449                 ieee80211_mgd_probe_ap(sdata, true);
2450         }
2451 }
2452
2453 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2454 {
2455         struct ieee80211_sub_if_data *sdata =
2456                 container_of(work, struct ieee80211_sub_if_data,
2457                              u.mgd.csa_connection_drop_work);
2458
2459         __ieee80211_disconnect(sdata);
2460 }
2461
2462 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2463 {
2464         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2465         struct ieee80211_hw *hw = &sdata->local->hw;
2466
2467         trace_api_beacon_loss(sdata);
2468
2469         sdata->u.mgd.connection_loss = false;
2470         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2471 }
2472 EXPORT_SYMBOL(ieee80211_beacon_loss);
2473
2474 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2475 {
2476         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2477         struct ieee80211_hw *hw = &sdata->local->hw;
2478
2479         trace_api_connection_loss(sdata);
2480
2481         sdata->u.mgd.connection_loss = true;
2482         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2483 }
2484 EXPORT_SYMBOL(ieee80211_connection_loss);
2485
2486
2487 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2488                                         bool assoc)
2489 {
2490         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2491
2492         sdata_assert_lock(sdata);
2493
2494         if (!assoc) {
2495                 /*
2496                  * we are not authenticated yet, the only timer that could be
2497                  * running is the timeout for the authentication response which
2498                  * which is not relevant anymore.
2499                  */
2500                 del_timer_sync(&sdata->u.mgd.timer);
2501                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2502
2503                 eth_zero_addr(sdata->u.mgd.bssid);
2504                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2505                 sdata->u.mgd.flags = 0;
2506                 mutex_lock(&sdata->local->mtx);
2507                 ieee80211_vif_release_channel(sdata);
2508                 mutex_unlock(&sdata->local->mtx);
2509         }
2510
2511         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2512         kfree(auth_data);
2513         sdata->u.mgd.auth_data = NULL;
2514 }
2515
2516 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2517                                          bool assoc, bool abandon)
2518 {
2519         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2520
2521         sdata_assert_lock(sdata);
2522
2523         if (!assoc) {
2524                 /*
2525                  * we are not associated yet, the only timer that could be
2526                  * running is the timeout for the association response which
2527                  * which is not relevant anymore.
2528                  */
2529                 del_timer_sync(&sdata->u.mgd.timer);
2530                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2531
2532                 eth_zero_addr(sdata->u.mgd.bssid);
2533                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2534                 sdata->u.mgd.flags = 0;
2535                 sdata->vif.mu_mimo_owner = false;
2536
2537                 mutex_lock(&sdata->local->mtx);
2538                 ieee80211_vif_release_channel(sdata);
2539                 mutex_unlock(&sdata->local->mtx);
2540
2541                 if (abandon)
2542                         cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2543         }
2544
2545         kfree(assoc_data);
2546         sdata->u.mgd.assoc_data = NULL;
2547 }
2548
2549 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2550                                      struct ieee80211_mgmt *mgmt, size_t len)
2551 {
2552         struct ieee80211_local *local = sdata->local;
2553         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2554         u8 *pos;
2555         struct ieee802_11_elems elems;
2556         u32 tx_flags = 0;
2557
2558         pos = mgmt->u.auth.variable;
2559         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2560         if (!elems.challenge)
2561                 return;
2562         auth_data->expected_transaction = 4;
2563         drv_mgd_prepare_tx(sdata->local, sdata);
2564         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2565                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2566                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2567         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2568                             elems.challenge - 2, elems.challenge_len + 2,
2569                             auth_data->bss->bssid, auth_data->bss->bssid,
2570                             auth_data->key, auth_data->key_len,
2571                             auth_data->key_idx, tx_flags);
2572 }
2573
2574 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2575                                    struct ieee80211_mgmt *mgmt, size_t len)
2576 {
2577         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2578         u8 bssid[ETH_ALEN];
2579         u16 auth_alg, auth_transaction, status_code;
2580         struct sta_info *sta;
2581         struct ieee80211_event event = {
2582                 .type = MLME_EVENT,
2583                 .u.mlme.data = AUTH_EVENT,
2584         };
2585
2586         sdata_assert_lock(sdata);
2587
2588         if (len < 24 + 6)
2589                 return;
2590
2591         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2592                 return;
2593
2594         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2595
2596         if (!ether_addr_equal(bssid, mgmt->bssid))
2597                 return;
2598
2599         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2600         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2601         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2602
2603         if (auth_alg != ifmgd->auth_data->algorithm ||
2604             auth_transaction != ifmgd->auth_data->expected_transaction) {
2605                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2606                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2607                            auth_transaction,
2608                            ifmgd->auth_data->expected_transaction);
2609                 return;
2610         }
2611
2612         if (status_code != WLAN_STATUS_SUCCESS) {
2613                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2614                            mgmt->sa, status_code);
2615                 ieee80211_destroy_auth_data(sdata, false);
2616                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2617                 event.u.mlme.status = MLME_DENIED;
2618                 event.u.mlme.reason = status_code;
2619                 drv_event_callback(sdata->local, sdata, &event);
2620                 return;
2621         }
2622
2623         switch (ifmgd->auth_data->algorithm) {
2624         case WLAN_AUTH_OPEN:
2625         case WLAN_AUTH_LEAP:
2626         case WLAN_AUTH_FT:
2627         case WLAN_AUTH_SAE:
2628         case WLAN_AUTH_FILS_SK:
2629         case WLAN_AUTH_FILS_SK_PFS:
2630         case WLAN_AUTH_FILS_PK:
2631                 break;
2632         case WLAN_AUTH_SHARED_KEY:
2633                 if (ifmgd->auth_data->expected_transaction != 4) {
2634                         ieee80211_auth_challenge(sdata, mgmt, len);
2635                         /* need another frame */
2636                         return;
2637                 }
2638                 break;
2639         default:
2640                 WARN_ONCE(1, "invalid auth alg %d",
2641                           ifmgd->auth_data->algorithm);
2642                 return;
2643         }
2644
2645         event.u.mlme.status = MLME_SUCCESS;
2646         drv_event_callback(sdata->local, sdata, &event);
2647         sdata_info(sdata, "authenticated\n");
2648         ifmgd->auth_data->done = true;
2649         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2650         ifmgd->auth_data->timeout_started = true;
2651         run_again(sdata, ifmgd->auth_data->timeout);
2652
2653         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2654             ifmgd->auth_data->expected_transaction != 2) {
2655                 /*
2656                  * Report auth frame to user space for processing since another
2657                  * round of Authentication frames is still needed.
2658                  */
2659                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2660                 return;
2661         }
2662
2663         /* move station state to auth */
2664         mutex_lock(&sdata->local->sta_mtx);
2665         sta = sta_info_get(sdata, bssid);
2666         if (!sta) {
2667                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2668                 goto out_err;
2669         }
2670         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2671                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2672                 goto out_err;
2673         }
2674         mutex_unlock(&sdata->local->sta_mtx);
2675
2676         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2677         return;
2678  out_err:
2679         mutex_unlock(&sdata->local->sta_mtx);
2680         /* ignore frame -- wait for timeout */
2681 }
2682
2683 #define case_WLAN(type) \
2684         case WLAN_REASON_##type: return #type
2685
2686 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2687 {
2688         switch (reason_code) {
2689         case_WLAN(UNSPECIFIED);
2690         case_WLAN(PREV_AUTH_NOT_VALID);
2691         case_WLAN(DEAUTH_LEAVING);
2692         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2693         case_WLAN(DISASSOC_AP_BUSY);
2694         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2695         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2696         case_WLAN(DISASSOC_STA_HAS_LEFT);
2697         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2698         case_WLAN(DISASSOC_BAD_POWER);
2699         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2700         case_WLAN(INVALID_IE);
2701         case_WLAN(MIC_FAILURE);
2702         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2703         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2704         case_WLAN(IE_DIFFERENT);
2705         case_WLAN(INVALID_GROUP_CIPHER);
2706         case_WLAN(INVALID_PAIRWISE_CIPHER);
2707         case_WLAN(INVALID_AKMP);
2708         case_WLAN(UNSUPP_RSN_VERSION);
2709         case_WLAN(INVALID_RSN_IE_CAP);
2710         case_WLAN(IEEE8021X_FAILED);
2711         case_WLAN(CIPHER_SUITE_REJECTED);
2712         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2713         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2714         case_WLAN(DISASSOC_LOW_ACK);
2715         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2716         case_WLAN(QSTA_LEAVE_QBSS);
2717         case_WLAN(QSTA_NOT_USE);
2718         case_WLAN(QSTA_REQUIRE_SETUP);
2719         case_WLAN(QSTA_TIMEOUT);
2720         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2721         case_WLAN(MESH_PEER_CANCELED);
2722         case_WLAN(MESH_MAX_PEERS);
2723         case_WLAN(MESH_CONFIG);
2724         case_WLAN(MESH_CLOSE);
2725         case_WLAN(MESH_MAX_RETRIES);
2726         case_WLAN(MESH_CONFIRM_TIMEOUT);
2727         case_WLAN(MESH_INVALID_GTK);
2728         case_WLAN(MESH_INCONSISTENT_PARAM);
2729         case_WLAN(MESH_INVALID_SECURITY);
2730         case_WLAN(MESH_PATH_ERROR);
2731         case_WLAN(MESH_PATH_NOFORWARD);
2732         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2733         case_WLAN(MAC_EXISTS_IN_MBSS);
2734         case_WLAN(MESH_CHAN_REGULATORY);
2735         case_WLAN(MESH_CHAN);
2736         default: return "<unknown>";
2737         }
2738 }
2739
2740 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2741                                      struct ieee80211_mgmt *mgmt, size_t len)
2742 {
2743         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2744         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2745
2746         sdata_assert_lock(sdata);
2747
2748         if (len < 24 + 2)
2749                 return;
2750
2751         if (ifmgd->associated &&
2752             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2753                 const u8 *bssid = ifmgd->associated->bssid;
2754
2755                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2756                            bssid, reason_code,
2757                            ieee80211_get_reason_code_string(reason_code));
2758
2759                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2760
2761                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2762                                             reason_code);
2763                 return;
2764         }
2765
2766         if (ifmgd->assoc_data &&
2767             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2768                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2769
2770                 sdata_info(sdata,
2771                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2772                            bssid, reason_code,
2773                            ieee80211_get_reason_code_string(reason_code));
2774
2775                 ieee80211_destroy_assoc_data(sdata, false, true);
2776
2777                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2778                 return;
2779         }
2780 }
2781
2782
2783 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2784                                        struct ieee80211_mgmt *mgmt, size_t len)
2785 {
2786         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2787         u16 reason_code;
2788
2789         sdata_assert_lock(sdata);
2790
2791         if (len < 24 + 2)
2792                 return;
2793
2794         if (!ifmgd->associated ||
2795             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2796                 return;
2797
2798         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2799
2800         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2801                    mgmt->sa, reason_code);
2802
2803         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2804
2805         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2806 }
2807
2808 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2809                                 u8 *supp_rates, unsigned int supp_rates_len,
2810                                 u32 *rates, u32 *basic_rates,
2811                                 bool *have_higher_than_11mbit,
2812                                 int *min_rate, int *min_rate_index,
2813                                 int shift, u32 rate_flags)
2814 {
2815         int i, j;
2816
2817         for (i = 0; i < supp_rates_len; i++) {
2818                 int rate = supp_rates[i] & 0x7f;
2819                 bool is_basic = !!(supp_rates[i] & 0x80);
2820
2821                 if ((rate * 5 * (1 << shift)) > 110)
2822                         *have_higher_than_11mbit = true;
2823
2824                 /*
2825                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2826                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2827                  *
2828                  * Note: Even through the membership selector and the basic
2829                  *       rate flag share the same bit, they are not exactly
2830                  *       the same.
2831                  */
2832                 if (!!(supp_rates[i] & 0x80) &&
2833                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2834                         continue;
2835
2836                 for (j = 0; j < sband->n_bitrates; j++) {
2837                         struct ieee80211_rate *br;
2838                         int brate;
2839
2840                         br = &sband->bitrates[j];
2841                         if ((rate_flags & br->flags) != rate_flags)
2842                                 continue;
2843
2844                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2845                         if (brate == rate) {
2846                                 *rates |= BIT(j);
2847                                 if (is_basic)
2848                                         *basic_rates |= BIT(j);
2849                                 if ((rate * 5) < *min_rate) {
2850                                         *min_rate = rate * 5;
2851                                         *min_rate_index = j;
2852                                 }
2853                                 break;
2854                         }
2855                 }
2856         }
2857 }
2858
2859 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2860                                     struct cfg80211_bss *cbss,
2861                                     struct ieee80211_mgmt *mgmt, size_t len)
2862 {
2863         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2864         struct ieee80211_local *local = sdata->local;
2865         struct ieee80211_supported_band *sband;
2866         struct sta_info *sta;
2867         u8 *pos;
2868         u16 capab_info, aid;
2869         struct ieee802_11_elems elems;
2870         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2871         const struct cfg80211_bss_ies *bss_ies = NULL;
2872         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2873         u32 changed = 0;
2874         int err;
2875         bool ret;
2876
2877         /* AssocResp and ReassocResp have identical structure */
2878
2879         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2880         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2881
2882         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2883                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2884                            aid);
2885         aid &= ~(BIT(15) | BIT(14));
2886
2887         ifmgd->broken_ap = false;
2888
2889         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2890                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2891                            aid);
2892                 aid = 0;
2893                 ifmgd->broken_ap = true;
2894         }
2895
2896         pos = mgmt->u.assoc_resp.variable;
2897         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2898
2899         if (!elems.supp_rates) {
2900                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2901                 return false;
2902         }
2903
2904         ifmgd->aid = aid;
2905         ifmgd->tdls_chan_switch_prohibited =
2906                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2907                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2908
2909         /*
2910          * Some APs are erroneously not including some information in their
2911          * (re)association response frames. Try to recover by using the data
2912          * from the beacon or probe response. This seems to afflict mobile
2913          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2914          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2915          */
2916         if ((assoc_data->wmm && !elems.wmm_param) ||
2917             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2918              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2919             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2920              (!elems.vht_cap_elem || !elems.vht_operation))) {
2921                 const struct cfg80211_bss_ies *ies;
2922                 struct ieee802_11_elems bss_elems;
2923
2924                 rcu_read_lock();
2925                 ies = rcu_dereference(cbss->ies);
2926                 if (ies)
2927                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2928                                           GFP_ATOMIC);
2929                 rcu_read_unlock();
2930                 if (!bss_ies)
2931                         return false;
2932
2933                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2934                                        false, &bss_elems);
2935                 if (assoc_data->wmm &&
2936                     !elems.wmm_param && bss_elems.wmm_param) {
2937                         elems.wmm_param = bss_elems.wmm_param;
2938                         sdata_info(sdata,
2939                                    "AP bug: WMM param missing from AssocResp\n");
2940                 }
2941
2942                 /*
2943                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2944                  * have to include the IEs in the (re)association response.
2945                  */
2946                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2947                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2948                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2949                         sdata_info(sdata,
2950                                    "AP bug: HT capability missing from AssocResp\n");
2951                 }
2952                 if (!elems.ht_operation && bss_elems.ht_operation &&
2953                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2954                         elems.ht_operation = bss_elems.ht_operation;
2955                         sdata_info(sdata,
2956                                    "AP bug: HT operation missing from AssocResp\n");
2957                 }
2958                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2959                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2960                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2961                         sdata_info(sdata,
2962                                    "AP bug: VHT capa missing from AssocResp\n");
2963                 }
2964                 if (!elems.vht_operation && bss_elems.vht_operation &&
2965                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2966                         elems.vht_operation = bss_elems.vht_operation;
2967                         sdata_info(sdata,
2968                                    "AP bug: VHT operation missing from AssocResp\n");
2969                 }
2970         }
2971
2972         /*
2973          * We previously checked these in the beacon/probe response, so
2974          * they should be present here. This is just a safety net.
2975          */
2976         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2977             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2978                 sdata_info(sdata,
2979                            "HT AP is missing WMM params or HT capability/operation\n");
2980                 ret = false;
2981                 goto out;
2982         }
2983
2984         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2985             (!elems.vht_cap_elem || !elems.vht_operation)) {
2986                 sdata_info(sdata,
2987                            "VHT AP is missing VHT capability/operation\n");
2988                 ret = false;
2989                 goto out;
2990         }
2991
2992         mutex_lock(&sdata->local->sta_mtx);
2993         /*
2994          * station info was already allocated and inserted before
2995          * the association and should be available to us
2996          */
2997         sta = sta_info_get(sdata, cbss->bssid);
2998         if (WARN_ON(!sta)) {
2999                 mutex_unlock(&sdata->local->sta_mtx);
3000                 ret = false;
3001                 goto out;
3002         }
3003
3004         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3005
3006         /* Set up internal HT/VHT capabilities */
3007         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3008                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3009                                                   elems.ht_cap_elem, sta);
3010
3011         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3012                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3013                                                     elems.vht_cap_elem, sta);
3014
3015         /*
3016          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3017          * in their association response, so ignore that data for our own
3018          * configuration. If it changed since the last beacon, we'll get the
3019          * next beacon and update then.
3020          */
3021
3022         /*
3023          * If an operating mode notification IE is present, override the
3024          * NSS calculation (that would be done in rate_control_rate_init())
3025          * and use the # of streams from that element.
3026          */
3027         if (elems.opmode_notif &&
3028             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3029                 u8 nss;
3030
3031                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3032                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3033                 nss += 1;
3034                 sta->sta.rx_nss = nss;
3035         }
3036
3037         rate_control_rate_init(sta);
3038
3039         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3040                 set_sta_flag(sta, WLAN_STA_MFP);
3041                 sta->sta.mfp = true;
3042         } else {
3043                 sta->sta.mfp = false;
3044         }
3045
3046         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3047
3048         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3049         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3050                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3051         if (err) {
3052                 sdata_info(sdata,
3053                            "failed to move station %pM to desired state\n",
3054                            sta->sta.addr);
3055                 WARN_ON(__sta_info_destroy(sta));
3056                 mutex_unlock(&sdata->local->sta_mtx);
3057                 ret = false;
3058                 goto out;
3059         }
3060
3061         mutex_unlock(&sdata->local->sta_mtx);
3062
3063         /*
3064          * Always handle WMM once after association regardless
3065          * of the first value the AP uses. Setting -1 here has
3066          * that effect because the AP values is an unsigned
3067          * 4-bit value.
3068          */
3069         ifmgd->wmm_last_param_set = -1;
3070
3071         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3072                 ieee80211_set_wmm_default(sdata, false, false);
3073         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3074                                              elems.wmm_param_len)) {
3075                 /* still enable QoS since we might have HT/VHT */
3076                 ieee80211_set_wmm_default(sdata, false, true);
3077                 /* set the disable-WMM flag in this case to disable
3078                  * tracking WMM parameter changes in the beacon if
3079                  * the parameters weren't actually valid. Doing so
3080                  * avoids changing parameters very strangely when
3081                  * the AP is going back and forth between valid and
3082                  * invalid parameters.
3083                  */
3084                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3085         }
3086         changed |= BSS_CHANGED_QOS;
3087
3088         /* set AID and assoc capability,
3089          * ieee80211_set_associated() will tell the driver */
3090         bss_conf->aid = aid;
3091         bss_conf->assoc_capability = capab_info;
3092         ieee80211_set_associated(sdata, cbss, changed);
3093
3094         /*
3095          * If we're using 4-addr mode, let the AP know that we're
3096          * doing so, so that it can create the STA VLAN on its side
3097          */
3098         if (ifmgd->use_4addr)
3099                 ieee80211_send_4addr_nullfunc(local, sdata);
3100
3101         /*
3102          * Start timer to probe the connection to the AP now.
3103          * Also start the timer that will detect beacon loss.
3104          */
3105         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3106         ieee80211_sta_reset_beacon_monitor(sdata);
3107
3108         ret = true;
3109  out:
3110         kfree(bss_ies);
3111         return ret;
3112 }
3113
3114 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3115                                          struct ieee80211_mgmt *mgmt,
3116                                          size_t len)
3117 {
3118         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3119         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3120         u16 capab_info, status_code, aid;
3121         struct ieee802_11_elems elems;
3122         int ac, uapsd_queues = -1;
3123         u8 *pos;
3124         bool reassoc;
3125         struct cfg80211_bss *bss;
3126         struct ieee80211_event event = {
3127                 .type = MLME_EVENT,
3128                 .u.mlme.data = ASSOC_EVENT,
3129         };
3130
3131         sdata_assert_lock(sdata);
3132
3133         if (!assoc_data)
3134                 return;
3135         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3136                 return;
3137
3138         /*
3139          * AssocResp and ReassocResp have identical structure, so process both
3140          * of them in this function.
3141          */
3142
3143         if (len < 24 + 6)
3144                 return;
3145
3146         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3147         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3148         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3149         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3150
3151         sdata_info(sdata,
3152                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3153                    reassoc ? "Rea" : "A", mgmt->sa,
3154                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3155
3156         if (assoc_data->fils_kek_len &&
3157             fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
3158                 return;
3159
3160         pos = mgmt->u.assoc_resp.variable;
3161         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3162
3163         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3164             elems.timeout_int &&
3165             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3166                 u32 tu, ms;
3167                 tu = le32_to_cpu(elems.timeout_int->value);
3168                 ms = tu * 1024 / 1000;
3169                 sdata_info(sdata,
3170                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3171                            mgmt->sa, tu, ms);
3172                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3173                 assoc_data->timeout_started = true;
3174                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3175                         run_again(sdata, assoc_data->timeout);
3176                 return;
3177         }
3178
3179         bss = assoc_data->bss;
3180
3181         if (status_code != WLAN_STATUS_SUCCESS) {
3182                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3183                            mgmt->sa, status_code);
3184                 ieee80211_destroy_assoc_data(sdata, false, false);
3185                 event.u.mlme.status = MLME_DENIED;
3186                 event.u.mlme.reason = status_code;
3187                 drv_event_callback(sdata->local, sdata, &event);
3188         } else {
3189                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3190                         /* oops -- internal error -- send timeout for now */
3191                         ieee80211_destroy_assoc_data(sdata, false, false);
3192                         cfg80211_assoc_timeout(sdata->dev, bss);
3193                         return;
3194                 }
3195                 event.u.mlme.status = MLME_SUCCESS;
3196                 drv_event_callback(sdata->local, sdata, &event);
3197                 sdata_info(sdata, "associated\n");
3198
3199                 /*
3200                  * destroy assoc_data afterwards, as otherwise an idle
3201                  * recalc after assoc_data is NULL but before associated
3202                  * is set can cause the interface to go idle
3203                  */
3204                 ieee80211_destroy_assoc_data(sdata, true, false);
3205
3206                 /* get uapsd queues configuration */
3207                 uapsd_queues = 0;
3208                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3209                         if (sdata->tx_conf[ac].uapsd)
3210                                 uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
3211         }
3212
3213         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3214 }
3215
3216 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3217                                   struct ieee80211_mgmt *mgmt, size_t len,
3218                                   struct ieee80211_rx_status *rx_status,
3219                                   struct ieee802_11_elems *elems)
3220 {
3221         struct ieee80211_local *local = sdata->local;
3222         struct ieee80211_bss *bss;
3223         struct ieee80211_channel *channel;
3224
3225         sdata_assert_lock(sdata);
3226
3227         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3228         if (!channel)
3229                 return;
3230
3231         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3232                                         channel);
3233         if (bss) {
3234                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3235                 ieee80211_rx_bss_put(local, bss);
3236         }
3237 }
3238
3239
3240 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3241                                          struct sk_buff *skb)
3242 {
3243         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3244         struct ieee80211_if_managed *ifmgd;
3245         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3246         size_t baselen, len = skb->len;
3247         struct ieee802_11_elems elems;
3248
3249         ifmgd = &sdata->u.mgd;
3250
3251         sdata_assert_lock(sdata);
3252
3253         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3254                 return; /* ignore ProbeResp to foreign address */
3255
3256         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3257         if (baselen > len)
3258                 return;
3259
3260         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3261                                false, &elems);
3262
3263         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3264
3265         if (ifmgd->associated &&
3266             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3267                 ieee80211_reset_ap_probe(sdata);
3268 }
3269
3270 /*
3271  * This is the canonical list of information elements we care about,
3272  * the filter code also gives us all changes to the Microsoft OUI
3273  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3274  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3275  * changes to requested client power.
3276  *
3277  * We implement beacon filtering in software since that means we can
3278  * avoid processing the frame here and in cfg80211, and userspace
3279  * will not be able to tell whether the hardware supports it or not.
3280  *
3281  * XXX: This list needs to be dynamic -- userspace needs to be able to
3282  *      add items it requires. It also needs to be able to tell us to
3283  *      look out for other vendor IEs.
3284  */
3285 static const u64 care_about_ies =
3286         (1ULL << WLAN_EID_COUNTRY) |
3287         (1ULL << WLAN_EID_ERP_INFO) |
3288         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3289         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3290         (1ULL << WLAN_EID_HT_CAPABILITY) |
3291         (1ULL << WLAN_EID_HT_OPERATION) |
3292         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3293
3294 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3295                                      struct ieee80211_mgmt *mgmt, size_t len,
3296                                      struct ieee80211_rx_status *rx_status)
3297 {
3298         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3299         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3300         size_t baselen;
3301         struct ieee802_11_elems elems;
3302         struct ieee80211_local *local = sdata->local;
3303         struct ieee80211_chanctx_conf *chanctx_conf;
3304         struct ieee80211_channel *chan;
3305         struct sta_info *sta;
3306         u32 changed = 0;
3307         bool erp_valid;
3308         u8 erp_value = 0;
3309         u32 ncrc;
3310         u8 *bssid;
3311         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3312
3313         sdata_assert_lock(sdata);
3314
3315         /* Process beacon from the current BSS */
3316         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3317         if (baselen > len)
3318                 return;
3319
3320         rcu_read_lock();
3321         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3322         if (!chanctx_conf) {
3323                 rcu_read_unlock();
3324                 return;
3325         }
3326
3327         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3328                 rcu_read_unlock();
3329                 return;
3330         }
3331         chan = chanctx_conf->def.chan;
3332         rcu_read_unlock();
3333
3334         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3335             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3336                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3337                                        len - baselen, false, &elems);
3338
3339                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3340                 if (elems.tim && !elems.parse_error) {
3341                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3342                         ifmgd->dtim_period = tim_ie->dtim_period;
3343                 }
3344                 ifmgd->have_beacon = true;
3345                 ifmgd->assoc_data->need_beacon = false;
3346                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3347                         sdata->vif.bss_conf.sync_tsf =
3348                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3349                         sdata->vif.bss_conf.sync_device_ts =
3350                                 rx_status->device_timestamp;
3351                         if (elems.tim)
3352                                 sdata->vif.bss_conf.sync_dtim_count =
3353                                         elems.tim->dtim_count;
3354                         else
3355                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3356                 }
3357                 /* continue assoc process */
3358                 ifmgd->assoc_data->timeout = jiffies;
3359                 ifmgd->assoc_data->timeout_started = true;
3360                 run_again(sdata, ifmgd->assoc_data->timeout);
3361                 return;
3362         }
3363
3364         if (!ifmgd->associated ||
3365             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3366                 return;
3367         bssid = ifmgd->associated->bssid;
3368
3369         /* Track average RSSI from the Beacon frames of the current AP */
3370         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3371                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3372                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3373                 ifmgd->last_cqm_event_signal = 0;
3374                 ifmgd->count_beacon_signal = 1;
3375                 ifmgd->last_ave_beacon_signal = 0;
3376         } else {
3377                 ifmgd->count_beacon_signal++;
3378         }
3379
3380         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3381
3382         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3383             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3384                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3385                 int last_sig = ifmgd->last_ave_beacon_signal;
3386                 struct ieee80211_event event = {
3387                         .type = RSSI_EVENT,
3388                 };
3389
3390                 /*
3391                  * if signal crosses either of the boundaries, invoke callback
3392                  * with appropriate parameters
3393                  */
3394                 if (sig > ifmgd->rssi_max_thold &&
3395                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3396                         ifmgd->last_ave_beacon_signal = sig;
3397                         event.u.rssi.data = RSSI_EVENT_HIGH;
3398                         drv_event_callback(local, sdata, &event);
3399                 } else if (sig < ifmgd->rssi_min_thold &&
3400                            (last_sig >= ifmgd->rssi_max_thold ||
3401                            last_sig == 0)) {
3402                         ifmgd->last_ave_beacon_signal = sig;
3403                         event.u.rssi.data = RSSI_EVENT_LOW;
3404                         drv_event_callback(local, sdata, &event);
3405                 }
3406         }
3407
3408         if (bss_conf->cqm_rssi_thold &&
3409             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3410             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3411                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3412                 int last_event = ifmgd->last_cqm_event_signal;
3413                 int thold = bss_conf->cqm_rssi_thold;
3414                 int hyst = bss_conf->cqm_rssi_hyst;
3415
3416                 if (sig < thold &&
3417                     (last_event == 0 || sig < last_event - hyst)) {
3418                         ifmgd->last_cqm_event_signal = sig;
3419                         ieee80211_cqm_rssi_notify(
3420                                 &sdata->vif,
3421                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3422                                 GFP_KERNEL);
3423                 } else if (sig > thold &&
3424                            (last_event == 0 || sig > last_event + hyst)) {
3425                         ifmgd->last_cqm_event_signal = sig;
3426                         ieee80211_cqm_rssi_notify(
3427                                 &sdata->vif,
3428                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3429                                 GFP_KERNEL);
3430                 }
3431         }
3432
3433         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3434                 mlme_dbg_ratelimited(sdata,
3435                                      "cancelling AP probe due to a received beacon\n");
3436                 ieee80211_reset_ap_probe(sdata);
3437         }
3438
3439         /*
3440          * Push the beacon loss detection into the future since
3441          * we are processing a beacon from the AP just now.
3442          */
3443         ieee80211_sta_reset_beacon_monitor(sdata);
3444
3445         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3446         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3447                                           len - baselen, false, &elems,
3448                                           care_about_ies, ncrc);
3449
3450         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3451             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3452                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3453                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3454                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3455                                 ieee80211_hw_config(local,
3456                                                     IEEE80211_CONF_CHANGE_PS);
3457                         }
3458                         ieee80211_send_nullfunc(local, sdata, false);
3459                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3460                         local->pspolling = true;
3461
3462                         /*
3463                          * Here is assumed that the driver will be
3464                          * able to send ps-poll frame and receive a
3465                          * response even though power save mode is
3466                          * enabled, but some drivers might require
3467                          * to disable power save here. This needs
3468                          * to be investigated.
3469                          */
3470                         ieee80211_send_pspoll(local, sdata);
3471                 }
3472         }
3473
3474         if (sdata->vif.p2p ||
3475             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3476                 struct ieee80211_p2p_noa_attr noa = {};
3477                 int ret;
3478
3479                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3480                                             len - baselen,
3481                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3482                                             (u8 *) &noa, sizeof(noa));
3483                 if (ret >= 2) {
3484                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3485                                 /* valid noa_attr and index changed */
3486                                 sdata->u.mgd.p2p_noa_index = noa.index;
3487                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3488                                 changed |= BSS_CHANGED_P2P_PS;
3489                                 /*
3490                                  * make sure we update all information, the CRC
3491                                  * mechanism doesn't look at P2P attributes.
3492                                  */
3493                                 ifmgd->beacon_crc_valid = false;
3494                         }
3495                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3496                         /* noa_attr not found and we had valid noa_attr before */
3497                         sdata->u.mgd.p2p_noa_index = -1;
3498                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3499                         changed |= BSS_CHANGED_P2P_PS;
3500                         ifmgd->beacon_crc_valid = false;
3501                 }
3502         }
3503
3504         if (ifmgd->csa_waiting_bcn)
3505                 ieee80211_chswitch_post_beacon(sdata);
3506
3507         /*
3508          * Update beacon timing and dtim count on every beacon appearance. This
3509          * will allow the driver to use the most updated values. Do it before
3510          * comparing this one with last received beacon.
3511          * IMPORTANT: These parameters would possibly be out of sync by the time
3512          * the driver will use them. The synchronized view is currently
3513          * guaranteed only in certain callbacks.
3514          */
3515         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3516                 sdata->vif.bss_conf.sync_tsf =
3517                         le64_to_cpu(mgmt->u.beacon.timestamp);
3518                 sdata->vif.bss_conf.sync_device_ts =
3519                         rx_status->device_timestamp;
3520                 if (elems.tim)
3521                         sdata->vif.bss_conf.sync_dtim_count =
3522                                 elems.tim->dtim_count;
3523                 else
3524                         sdata->vif.bss_conf.sync_dtim_count = 0;
3525         }
3526
3527         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3528                 return;
3529         ifmgd->beacon_crc = ncrc;
3530         ifmgd->beacon_crc_valid = true;
3531
3532         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3533
3534         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3535                                          rx_status->device_timestamp,
3536                                          &elems, true);
3537
3538         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3539             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3540                                      elems.wmm_param_len))
3541                 changed |= BSS_CHANGED_QOS;
3542
3543         /*
3544          * If we haven't had a beacon before, tell the driver about the
3545          * DTIM period (and beacon timing if desired) now.
3546          */
3547         if (!ifmgd->have_beacon) {
3548                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3549                 if (elems.tim)
3550                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3551                 else
3552                         bss_conf->dtim_period = 1;
3553
3554                 changed |= BSS_CHANGED_BEACON_INFO;
3555                 ifmgd->have_beacon = true;
3556
3557                 mutex_lock(&local->iflist_mtx);
3558                 ieee80211_recalc_ps(local);
3559                 mutex_unlock(&local->iflist_mtx);
3560
3561                 ieee80211_recalc_ps_vif(sdata);
3562         }
3563
3564         if (elems.erp_info) {
3565                 erp_valid = true;
3566                 erp_value = elems.erp_info[0];
3567         } else {
3568                 erp_valid = false;
3569         }
3570         changed |= ieee80211_handle_bss_capability(sdata,
3571                         le16_to_cpu(mgmt->u.beacon.capab_info),
3572                         erp_valid, erp_value);
3573
3574         mutex_lock(&local->sta_mtx);
3575         sta = sta_info_get(sdata, bssid);
3576
3577         if (ieee80211_config_bw(sdata, sta,
3578                                 elems.ht_cap_elem, elems.ht_operation,
3579                                 elems.vht_operation, bssid, &changed)) {
3580                 mutex_unlock(&local->sta_mtx);
3581                 sdata_info(sdata,
3582                            "failed to follow AP %pM bandwidth change, disconnect\n",
3583                            bssid);
3584                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3585                                        WLAN_REASON_DEAUTH_LEAVING,
3586                                        true, deauth_buf);
3587                 ieee80211_report_disconnect(sdata, deauth_buf,
3588                                             sizeof(deauth_buf), true,
3589                                             WLAN_REASON_DEAUTH_LEAVING);
3590                 return;
3591         }
3592
3593         if (sta && elems.opmode_notif)
3594                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3595                                             rx_status->band);
3596         mutex_unlock(&local->sta_mtx);
3597
3598         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3599                                                elems.country_elem,
3600                                                elems.country_elem_len,
3601                                                elems.pwr_constr_elem,
3602                                                elems.cisco_dtpc_elem);
3603
3604         ieee80211_bss_info_change_notify(sdata, changed);
3605 }
3606
3607 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3608                                   struct sk_buff *skb)
3609 {
3610         struct ieee80211_rx_status *rx_status;
3611         struct ieee80211_mgmt *mgmt;
3612         u16 fc;
3613         struct ieee802_11_elems elems;
3614         int ies_len;
3615
3616         rx_status = (struct ieee80211_rx_status *) skb->cb;
3617         mgmt = (struct ieee80211_mgmt *) skb->data;
3618         fc = le16_to_cpu(mgmt->frame_control);
3619
3620         sdata_lock(sdata);
3621
3622         switch (fc & IEEE80211_FCTL_STYPE) {
3623         case IEEE80211_STYPE_BEACON:
3624                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3625                 break;
3626         case IEEE80211_STYPE_PROBE_RESP:
3627                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3628                 break;
3629         case IEEE80211_STYPE_AUTH:
3630                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3631                 break;
3632         case IEEE80211_STYPE_DEAUTH:
3633                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3634                 break;
3635         case IEEE80211_STYPE_DISASSOC:
3636                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3637                 break;
3638         case IEEE80211_STYPE_ASSOC_RESP:
3639         case IEEE80211_STYPE_REASSOC_RESP:
3640                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3641                 break;
3642         case IEEE80211_STYPE_ACTION:
3643                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3644                         ies_len = skb->len -
3645                                   offsetof(struct ieee80211_mgmt,
3646                                            u.action.u.chan_switch.variable);
3647
3648                         if (ies_len < 0)
3649                                 break;
3650
3651                         ieee802_11_parse_elems(
3652                                 mgmt->u.action.u.chan_switch.variable,
3653                                 ies_len, true, &elems);
3654
3655                         if (elems.parse_error)
3656                                 break;
3657
3658                         ieee80211_sta_process_chanswitch(sdata,
3659                                                  rx_status->mactime,
3660                                                  rx_status->device_timestamp,
3661                                                  &elems, false);
3662                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3663                         ies_len = skb->len -
3664                                   offsetof(struct ieee80211_mgmt,
3665                                            u.action.u.ext_chan_switch.variable);
3666
3667                         if (ies_len < 0)
3668                                 break;
3669
3670                         ieee802_11_parse_elems(
3671                                 mgmt->u.action.u.ext_chan_switch.variable,
3672                                 ies_len, true, &elems);
3673
3674                         if (elems.parse_error)
3675                                 break;
3676
3677                         /* for the handling code pretend this was also an IE */
3678                         elems.ext_chansw_ie =
3679                                 &mgmt->u.action.u.ext_chan_switch.data;
3680
3681                         ieee80211_sta_process_chanswitch(sdata,
3682                                                  rx_status->mactime,
3683                                                  rx_status->device_timestamp,
3684                                                  &elems, false);
3685                 }
3686                 break;
3687         }
3688         sdata_unlock(sdata);
3689 }
3690
3691 static void ieee80211_sta_timer(unsigned long data)
3692 {
3693         struct ieee80211_sub_if_data *sdata =
3694                 (struct ieee80211_sub_if_data *) data;
3695
3696         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3697 }
3698
3699 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3700                                           u8 *bssid, u8 reason, bool tx)
3701 {
3702         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3703
3704         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3705                                tx, frame_buf);
3706
3707         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3708                                     reason);
3709 }
3710
3711 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3712 {
3713         struct ieee80211_local *local = sdata->local;
3714         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3715         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3716         u32 tx_flags = 0;
3717         u16 trans = 1;
3718         u16 status = 0;
3719
3720         sdata_assert_lock(sdata);
3721
3722         if (WARN_ON_ONCE(!auth_data))
3723                 return -EINVAL;
3724
3725         auth_data->tries++;
3726
3727         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3728                 sdata_info(sdata, "authentication with %pM timed out\n",
3729                            auth_data->bss->bssid);
3730
3731                 /*
3732                  * Most likely AP is not in the range so remove the
3733                  * bss struct for that AP.
3734                  */
3735                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3736
3737                 return -ETIMEDOUT;
3738         }
3739
3740         drv_mgd_prepare_tx(local, sdata);
3741
3742         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3743                    auth_data->bss->bssid, auth_data->tries,
3744                    IEEE80211_AUTH_MAX_TRIES);
3745
3746         auth_data->expected_transaction = 2;
3747
3748         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3749                 trans = auth_data->sae_trans;
3750                 status = auth_data->sae_status;
3751                 auth_data->expected_transaction = trans;
3752         }
3753
3754         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3755                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3756                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3757
3758         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3759                             auth_data->data, auth_data->data_len,
3760                             auth_data->bss->bssid,
3761                             auth_data->bss->bssid, NULL, 0, 0,
3762                             tx_flags);
3763
3764         if (tx_flags == 0) {
3765                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3766                 auth_data->timeout_started = true;
3767                 run_again(sdata, auth_data->timeout);
3768         } else {
3769                 auth_data->timeout =
3770                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3771                 auth_data->timeout_started = true;
3772                 run_again(sdata, auth_data->timeout);
3773         }
3774
3775         return 0;
3776 }
3777
3778 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3779 {
3780         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3781         struct ieee80211_local *local = sdata->local;
3782
3783         sdata_assert_lock(sdata);
3784
3785         assoc_data->tries++;
3786         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3787                 sdata_info(sdata, "association with %pM timed out\n",
3788                            assoc_data->bss->bssid);
3789
3790                 /*
3791                  * Most likely AP is not in the range so remove the
3792                  * bss struct for that AP.
3793                  */
3794                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3795
3796                 return -ETIMEDOUT;
3797         }
3798
3799         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3800                    assoc_data->bss->bssid, assoc_data->tries,
3801                    IEEE80211_ASSOC_MAX_TRIES);
3802         ieee80211_send_assoc(sdata);
3803
3804         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3805                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3806                 assoc_data->timeout_started = true;
3807                 run_again(sdata, assoc_data->timeout);
3808         } else {
3809                 assoc_data->timeout =
3810                         round_jiffies_up(jiffies +
3811                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3812                 assoc_data->timeout_started = true;
3813                 run_again(sdata, assoc_data->timeout);
3814         }
3815
3816         return 0;
3817 }
3818
3819 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3820                                   __le16 fc, bool acked)
3821 {
3822         struct ieee80211_local *local = sdata->local;
3823
3824         sdata->u.mgd.status_fc = fc;
3825         sdata->u.mgd.status_acked = acked;
3826         sdata->u.mgd.status_received = true;
3827
3828         ieee80211_queue_work(&local->hw, &sdata->work);
3829 }
3830
3831 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3832 {
3833         struct ieee80211_local *local = sdata->local;
3834         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3835
3836         sdata_lock(sdata);
3837
3838         if (ifmgd->status_received) {
3839                 __le16 fc = ifmgd->status_fc;
3840                 bool status_acked = ifmgd->status_acked;
3841
3842                 ifmgd->status_received = false;
3843                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3844                         if (status_acked) {
3845                                 ifmgd->auth_data->timeout =
3846                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3847                                 run_again(sdata, ifmgd->auth_data->timeout);
3848                         } else {
3849                                 ifmgd->auth_data->timeout = jiffies - 1;
3850                         }
3851                         ifmgd->auth_data->timeout_started = true;
3852                 } else if (ifmgd->assoc_data &&
3853                            (ieee80211_is_assoc_req(fc) ||
3854                             ieee80211_is_reassoc_req(fc))) {
3855                         if (status_acked) {
3856                                 ifmgd->assoc_data->timeout =
3857                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3858                                 run_again(sdata, ifmgd->assoc_data->timeout);
3859                         } else {
3860                                 ifmgd->assoc_data->timeout = jiffies - 1;
3861                         }
3862                         ifmgd->assoc_data->timeout_started = true;
3863                 }
3864         }
3865
3866         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3867             time_after(jiffies, ifmgd->auth_data->timeout)) {
3868                 if (ifmgd->auth_data->done) {
3869                         /*
3870                          * ok ... we waited for assoc but userspace didn't,
3871                          * so let's just kill the auth data
3872                          */
3873                         ieee80211_destroy_auth_data(sdata, false);
3874                 } else if (ieee80211_auth(sdata)) {
3875                         u8 bssid[ETH_ALEN];
3876                         struct ieee80211_event event = {
3877                                 .type = MLME_EVENT,
3878                                 .u.mlme.data = AUTH_EVENT,
3879                                 .u.mlme.status = MLME_TIMEOUT,
3880                         };
3881
3882                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3883
3884                         ieee80211_destroy_auth_data(sdata, false);
3885
3886                         cfg80211_auth_timeout(sdata->dev, bssid);
3887                         drv_event_callback(sdata->local, sdata, &event);
3888                 }
3889         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3890                 run_again(sdata, ifmgd->auth_data->timeout);
3891
3892         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3893             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3894                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3895                     ieee80211_do_assoc(sdata)) {
3896                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3897                         struct ieee80211_event event = {
3898                                 .type = MLME_EVENT,
3899                                 .u.mlme.data = ASSOC_EVENT,
3900                                 .u.mlme.status = MLME_TIMEOUT,
3901                         };
3902
3903                         ieee80211_destroy_assoc_data(sdata, false, false);
3904                         cfg80211_assoc_timeout(sdata->dev, bss);
3905                         drv_event_callback(sdata->local, sdata, &event);
3906                 }
3907         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3908                 run_again(sdata, ifmgd->assoc_data->timeout);
3909
3910         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3911             ifmgd->associated) {
3912                 u8 bssid[ETH_ALEN];
3913                 int max_tries;
3914
3915                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3916
3917                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3918                         max_tries = max_nullfunc_tries;
3919                 else
3920                         max_tries = max_probe_tries;
3921
3922                 /* ACK received for nullfunc probing frame */
3923                 if (!ifmgd->probe_send_count)
3924                         ieee80211_reset_ap_probe(sdata);
3925                 else if (ifmgd->nullfunc_failed) {
3926                         if (ifmgd->probe_send_count < max_tries) {
3927                                 mlme_dbg(sdata,
3928                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3929                                          bssid, ifmgd->probe_send_count,
3930                                          max_tries);
3931                                 ieee80211_mgd_probe_ap_send(sdata);
3932                         } else {
3933                                 mlme_dbg(sdata,
3934                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3935                                          bssid);
3936                                 ieee80211_sta_connection_lost(sdata, bssid,
3937                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3938                                         false);
3939                         }
3940                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3941                         run_again(sdata, ifmgd->probe_timeout);
3942                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3943                         mlme_dbg(sdata,
3944                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3945                                  bssid, probe_wait_ms);
3946                         ieee80211_sta_connection_lost(sdata, bssid,
3947                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3948                 } else if (ifmgd->probe_send_count < max_tries) {
3949                         mlme_dbg(sdata,
3950                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3951                                  bssid, probe_wait_ms,
3952                                  ifmgd->probe_send_count, max_tries);
3953                         ieee80211_mgd_probe_ap_send(sdata);
3954                 } else {
3955                         /*
3956                          * We actually lost the connection ... or did we?
3957                          * Let's make sure!
3958                          */
3959                         mlme_dbg(sdata,
3960                                  "No probe response from AP %pM after %dms, disconnecting.\n",
3961                                  bssid, probe_wait_ms);
3962
3963                         ieee80211_sta_connection_lost(sdata, bssid,
3964                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3965                 }
3966         }
3967
3968         sdata_unlock(sdata);
3969 }
3970
3971 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3972 {
3973         struct ieee80211_sub_if_data *sdata =
3974                 (struct ieee80211_sub_if_data *) data;
3975         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3976
3977         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3978                 return;
3979
3980         sdata->u.mgd.connection_loss = false;
3981         ieee80211_queue_work(&sdata->local->hw,
3982                              &sdata->u.mgd.beacon_connection_loss_work);
3983 }
3984
3985 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3986 {
3987         struct ieee80211_sub_if_data *sdata =
3988                 (struct ieee80211_sub_if_data *) data;
3989         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3990         struct ieee80211_local *local = sdata->local;
3991
3992         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3993                 return;
3994
3995         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3996 }
3997
3998 static void ieee80211_sta_monitor_work(struct work_struct *work)
3999 {
4000         struct ieee80211_sub_if_data *sdata =
4001                 container_of(work, struct ieee80211_sub_if_data,
4002                              u.mgd.monitor_work);
4003
4004         ieee80211_mgd_probe_ap(sdata, false);
4005 }
4006
4007 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4008 {
4009         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4010                 __ieee80211_stop_poll(sdata);
4011
4012                 /* let's probe the connection once */
4013                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4014                         ieee80211_queue_work(&sdata->local->hw,
4015                                              &sdata->u.mgd.monitor_work);
4016         }
4017 }
4018
4019 #ifdef CONFIG_PM
4020 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4021 {
4022         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4023         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4024
4025         sdata_lock(sdata);
4026
4027         if (ifmgd->auth_data || ifmgd->assoc_data) {
4028                 const u8 *bssid = ifmgd->auth_data ?
4029                                 ifmgd->auth_data->bss->bssid :
4030                                 ifmgd->assoc_data->bss->bssid;
4031
4032                 /*
4033                  * If we are trying to authenticate / associate while suspending,
4034                  * cfg80211 won't know and won't actually abort those attempts,
4035                  * thus we need to do that ourselves.
4036                  */
4037                 ieee80211_send_deauth_disassoc(sdata, bssid,
4038                                                IEEE80211_STYPE_DEAUTH,
4039                                                WLAN_REASON_DEAUTH_LEAVING,
4040                                                false, frame_buf);
4041                 if (ifmgd->assoc_data)
4042                         ieee80211_destroy_assoc_data(sdata, false, true);
4043                 if (ifmgd->auth_data)
4044                         ieee80211_destroy_auth_data(sdata, false);
4045                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4046                                       IEEE80211_DEAUTH_FRAME_LEN);
4047         }
4048
4049         /* This is a bit of a hack - we should find a better and more generic
4050          * solution to this. Normally when suspending, cfg80211 will in fact
4051          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4052          * auth (not so important) or assoc (this is the problem) process.
4053          *
4054          * As a consequence, it can happen that we are in the process of both
4055          * associating and suspending, and receive an association response
4056          * after cfg80211 has checked if it needs to disconnect, but before
4057          * we actually set the flag to drop incoming frames. This will then
4058          * cause the workqueue flush to process the association response in
4059          * the suspend, resulting in a successful association just before it
4060          * tries to remove the interface from the driver, which now though
4061          * has a channel context assigned ... this results in issues.
4062          *
4063          * To work around this (for now) simply deauth here again if we're
4064          * now connected.
4065          */
4066         if (ifmgd->associated && !sdata->local->wowlan) {
4067                 u8 bssid[ETH_ALEN];
4068                 struct cfg80211_deauth_request req = {
4069                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4070                         .bssid = bssid,
4071                 };
4072
4073                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4074                 ieee80211_mgd_deauth(sdata, &req);
4075         }
4076
4077         sdata_unlock(sdata);
4078 }
4079
4080 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4081 {
4082         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4083
4084         sdata_lock(sdata);
4085         if (!ifmgd->associated) {
4086                 sdata_unlock(sdata);
4087                 return;
4088         }
4089
4090         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4091                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4092                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4093                 ieee80211_sta_connection_lost(sdata,
4094                                               ifmgd->associated->bssid,
4095                                               WLAN_REASON_UNSPECIFIED,
4096                                               true);
4097                 sdata_unlock(sdata);
4098                 return;
4099         }
4100         sdata_unlock(sdata);
4101 }
4102 #endif
4103
4104 /* interface setup */
4105 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4106 {
4107         struct ieee80211_if_managed *ifmgd;
4108
4109         ifmgd = &sdata->u.mgd;
4110         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4111         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4112         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4113                   ieee80211_beacon_connection_loss_work);
4114         INIT_WORK(&ifmgd->csa_connection_drop_work,
4115                   ieee80211_csa_connection_drop_work);
4116         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4117         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4118                           ieee80211_tdls_peer_del_work);
4119         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4120                     (unsigned long) sdata);
4121         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4122                     (unsigned long) sdata);
4123         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4124                     (unsigned long) sdata);
4125         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4126                     (unsigned long) sdata);
4127         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4128                           ieee80211_sta_handle_tspec_ac_params_wk);
4129
4130         ifmgd->flags = 0;
4131         ifmgd->powersave = sdata->wdev.ps;
4132         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4133         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4134         ifmgd->p2p_noa_index = -1;
4135
4136         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4137                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4138         else
4139                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4140
4141         /* Setup TDLS data */
4142         spin_lock_init(&ifmgd->teardown_lock);
4143         ifmgd->teardown_skb = NULL;
4144         ifmgd->orig_teardown_skb = NULL;
4145 }
4146
4147 /* scan finished notification */
4148 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4149 {
4150         struct ieee80211_sub_if_data *sdata;
4151
4152         /* Restart STA timers */
4153         rcu_read_lock();
4154         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4155                 if (ieee80211_sdata_running(sdata))
4156                         ieee80211_restart_sta_timer(sdata);
4157         }
4158         rcu_read_unlock();
4159 }
4160
4161 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4162                                      struct cfg80211_bss *cbss)
4163 {
4164         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4165         const u8 *ht_cap_ie, *vht_cap_ie;
4166         const struct ieee80211_ht_cap *ht_cap;
4167         const struct ieee80211_vht_cap *vht_cap;
4168         u8 chains = 1;
4169
4170         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4171                 return chains;
4172
4173         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4174         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4175                 ht_cap = (void *)(ht_cap_ie + 2);
4176                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4177                 /*
4178                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4179                  *       "Tx Unequal Modulation Supported" fields.
4180                  */
4181         }
4182
4183         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4184                 return chains;
4185
4186         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4187         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4188                 u8 nss;
4189                 u16 tx_mcs_map;
4190
4191                 vht_cap = (void *)(vht_cap_ie + 2);
4192                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4193                 for (nss = 8; nss > 0; nss--) {
4194                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4195                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4196                                 break;
4197                 }
4198                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4199                 chains = max(chains, nss);
4200         }
4201
4202         return chains;
4203 }
4204
4205 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4206                                   struct cfg80211_bss *cbss)
4207 {
4208         struct ieee80211_local *local = sdata->local;
4209         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4210         const struct ieee80211_ht_cap *ht_cap = NULL;
4211         const struct ieee80211_ht_operation *ht_oper = NULL;
4212         const struct ieee80211_vht_operation *vht_oper = NULL;
4213         struct ieee80211_supported_band *sband;
4214         struct cfg80211_chan_def chandef;
4215         int ret;
4216         u32 i;
4217         bool have_80mhz;
4218
4219         sband = local->hw.wiphy->bands[cbss->channel->band];
4220
4221         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4222                           IEEE80211_STA_DISABLE_80P80MHZ |
4223                           IEEE80211_STA_DISABLE_160MHZ);
4224
4225         rcu_read_lock();
4226
4227         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4228             sband->ht_cap.ht_supported) {
4229                 const u8 *ht_oper_ie, *ht_cap_ie;
4230
4231                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4232                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4233                         ht_oper = (void *)(ht_oper_ie + 2);
4234
4235                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4236                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4237                         ht_cap = (void *)(ht_cap_ie + 2);
4238
4239                 if (!ht_cap) {
4240                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4241                         ht_oper = NULL;
4242                 }
4243         }
4244
4245         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4246             sband->vht_cap.vht_supported) {
4247                 const u8 *vht_oper_ie, *vht_cap;
4248
4249                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4250                                                    WLAN_EID_VHT_OPERATION);
4251                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4252                         vht_oper = (void *)(vht_oper_ie + 2);
4253                 if (vht_oper && !ht_oper) {
4254                         vht_oper = NULL;
4255                         sdata_info(sdata,
4256                                    "AP advertised VHT without HT, disabling both\n");
4257                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4258                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4259                 }
4260
4261                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4262                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4263                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4264                         vht_oper = NULL;
4265                 }
4266         }
4267
4268         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4269         have_80mhz = false;
4270         for (i = 0; i < sband->n_channels; i++) {
4271                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4272                                                 IEEE80211_CHAN_NO_80MHZ))
4273                         continue;
4274
4275                 have_80mhz = true;
4276                 break;
4277         }
4278
4279         if (!have_80mhz)
4280                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4281
4282         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4283                                                      cbss->channel,
4284                                                      ht_cap, ht_oper, vht_oper,
4285                                                      &chandef, false);
4286
4287         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4288                                       local->rx_chains);
4289
4290         rcu_read_unlock();
4291
4292         /* will change later if needed */
4293         sdata->smps_mode = IEEE80211_SMPS_OFF;
4294
4295         mutex_lock(&local->mtx);
4296         /*
4297          * If this fails (possibly due to channel context sharing
4298          * on incompatible channels, e.g. 80+80 and 160 sharing the
4299          * same control channel) try to use a smaller bandwidth.
4300          */
4301         ret = ieee80211_vif_use_channel(sdata, &chandef,
4302                                         IEEE80211_CHANCTX_SHARED);
4303
4304         /* don't downgrade for 5 and 10 MHz channels, though. */
4305         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4306             chandef.width == NL80211_CHAN_WIDTH_10)
4307                 goto out;
4308
4309         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4310                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4311                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4312                                                 IEEE80211_CHANCTX_SHARED);
4313         }
4314  out:
4315         mutex_unlock(&local->mtx);
4316         return ret;
4317 }
4318
4319 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4320                                      struct cfg80211_bss *cbss, bool assoc,
4321                                      bool override)
4322 {
4323         struct ieee80211_local *local = sdata->local;
4324         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4325         struct ieee80211_bss *bss = (void *)cbss->priv;
4326         struct sta_info *new_sta = NULL;
4327         struct ieee80211_supported_band *sband;
4328         bool have_sta = false;
4329         int err;
4330
4331         sband = local->hw.wiphy->bands[cbss->channel->band];
4332
4333         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4334                 return -EINVAL;
4335
4336         if (assoc) {
4337                 rcu_read_lock();
4338                 have_sta = sta_info_get(sdata, cbss->bssid);
4339                 rcu_read_unlock();
4340         }
4341
4342         if (!have_sta) {
4343                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4344                 if (!new_sta)
4345                         return -ENOMEM;
4346         }
4347
4348         if (new_sta || override) {
4349                 err = ieee80211_prep_channel(sdata, cbss);
4350                 if (err) {
4351                         if (new_sta)
4352                                 sta_info_free(local, new_sta);
4353                         return -EINVAL;
4354                 }
4355         }
4356
4357         if (new_sta) {
4358                 u32 rates = 0, basic_rates = 0;
4359                 bool have_higher_than_11mbit;
4360                 int min_rate = INT_MAX, min_rate_index = -1;
4361                 struct ieee80211_chanctx_conf *chanctx_conf;
4362                 const struct cfg80211_bss_ies *ies;
4363                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4364                 u32 rate_flags;
4365
4366                 rcu_read_lock();
4367                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4368                 if (WARN_ON(!chanctx_conf)) {
4369                         rcu_read_unlock();
4370                         sta_info_free(local, new_sta);
4371                         return -EINVAL;
4372                 }
4373                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4374                 rcu_read_unlock();
4375
4376                 ieee80211_get_rates(sband, bss->supp_rates,
4377                                     bss->supp_rates_len,
4378                                     &rates, &basic_rates,
4379                                     &have_higher_than_11mbit,
4380                                     &min_rate, &min_rate_index,
4381                                     shift, rate_flags);
4382
4383                 /*
4384                  * This used to be a workaround for basic rates missing
4385                  * in the association response frame. Now that we no
4386                  * longer use the basic rates from there, it probably
4387                  * doesn't happen any more, but keep the workaround so
4388                  * in case some *other* APs are buggy in different ways
4389                  * we can connect -- with a warning.
4390                  */
4391                 if (!basic_rates && min_rate_index >= 0) {
4392                         sdata_info(sdata,
4393                                    "No basic rates, using min rate instead\n");
4394                         basic_rates = BIT(min_rate_index);
4395                 }
4396
4397                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4398                 sdata->vif.bss_conf.basic_rates = basic_rates;
4399
4400                 /* cf. IEEE 802.11 9.2.12 */
4401                 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4402                     have_higher_than_11mbit)
4403                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4404                 else
4405                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4406
4407                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4408
4409                 /* set timing information */
4410                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4411                 rcu_read_lock();
4412                 ies = rcu_dereference(cbss->beacon_ies);
4413                 if (ies) {
4414                         const u8 *tim_ie;
4415
4416                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4417                         sdata->vif.bss_conf.sync_device_ts =
4418                                 bss->device_ts_beacon;
4419                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4420                                                   ies->data, ies->len);
4421                         if (tim_ie && tim_ie[1] >= 2)
4422                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4423                         else
4424                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4425                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4426                                                TIMING_BEACON_ONLY)) {
4427                         ies = rcu_dereference(cbss->proberesp_ies);
4428                         /* must be non-NULL since beacon IEs were NULL */
4429                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4430                         sdata->vif.bss_conf.sync_device_ts =
4431                                 bss->device_ts_presp;
4432                         sdata->vif.bss_conf.sync_dtim_count = 0;
4433                 } else {
4434                         sdata->vif.bss_conf.sync_tsf = 0;
4435                         sdata->vif.bss_conf.sync_device_ts = 0;
4436                         sdata->vif.bss_conf.sync_dtim_count = 0;
4437                 }
4438                 rcu_read_unlock();
4439
4440                 /* tell driver about BSSID, basic rates and timing */
4441                 ieee80211_bss_info_change_notify(sdata,
4442                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4443                         BSS_CHANGED_BEACON_INT);
4444
4445                 if (assoc)
4446                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4447
4448                 err = sta_info_insert(new_sta);
4449                 new_sta = NULL;
4450                 if (err) {
4451                         sdata_info(sdata,
4452                                    "failed to insert STA entry for the AP (error %d)\n",
4453                                    err);
4454                         return err;
4455                 }
4456         } else
4457                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4458
4459         /* Cancel scan to ensure that nothing interferes with connection */
4460         if (local->scanning)
4461                 ieee80211_scan_cancel(local);
4462
4463         return 0;
4464 }
4465
4466 /* config hooks */
4467 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4468                        struct cfg80211_auth_request *req)
4469 {
4470         struct ieee80211_local *local = sdata->local;
4471         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4472         struct ieee80211_mgd_auth_data *auth_data;
4473         u16 auth_alg;
4474         int err;
4475
4476         /* prepare auth data structure */
4477
4478         switch (req->auth_type) {
4479         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4480                 auth_alg = WLAN_AUTH_OPEN;
4481                 break;
4482         case NL80211_AUTHTYPE_SHARED_KEY:
4483                 if (IS_ERR(local->wep_tx_tfm))
4484                         return -EOPNOTSUPP;
4485                 auth_alg = WLAN_AUTH_SHARED_KEY;
4486                 break;
4487         case NL80211_AUTHTYPE_FT:
4488                 auth_alg = WLAN_AUTH_FT;
4489                 break;
4490         case NL80211_AUTHTYPE_NETWORK_EAP:
4491                 auth_alg = WLAN_AUTH_LEAP;
4492                 break;
4493         case NL80211_AUTHTYPE_SAE:
4494                 auth_alg = WLAN_AUTH_SAE;
4495                 break;
4496         case NL80211_AUTHTYPE_FILS_SK:
4497                 auth_alg = WLAN_AUTH_FILS_SK;
4498                 break;
4499         case NL80211_AUTHTYPE_FILS_SK_PFS:
4500                 auth_alg = WLAN_AUTH_FILS_SK_PFS;
4501                 break;
4502         case NL80211_AUTHTYPE_FILS_PK:
4503                 auth_alg = WLAN_AUTH_FILS_PK;
4504                 break;
4505         default:
4506                 return -EOPNOTSUPP;
4507         }
4508
4509         auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4510                             req->ie_len, GFP_KERNEL);
4511         if (!auth_data)
4512                 return -ENOMEM;
4513
4514         auth_data->bss = req->bss;
4515
4516         if (req->auth_data_len >= 4) {
4517                 if (req->auth_type == NL80211_AUTHTYPE_SAE) {
4518                         __le16 *pos = (__le16 *) req->auth_data;
4519
4520                         auth_data->sae_trans = le16_to_cpu(pos[0]);
4521                         auth_data->sae_status = le16_to_cpu(pos[1]);
4522                 }
4523                 memcpy(auth_data->data, req->auth_data + 4,
4524                        req->auth_data_len - 4);
4525                 auth_data->data_len += req->auth_data_len - 4;
4526         }
4527
4528         if (req->ie && req->ie_len) {
4529                 memcpy(&auth_data->data[auth_data->data_len],
4530                        req->ie, req->ie_len);
4531                 auth_data->data_len += req->ie_len;
4532         }
4533
4534         if (req->key && req->key_len) {
4535                 auth_data->key_len = req->key_len;
4536                 auth_data->key_idx = req->key_idx;
4537                 memcpy(auth_data->key, req->key, req->key_len);
4538         }
4539
4540         auth_data->algorithm = auth_alg;
4541
4542         /* try to authenticate/probe */
4543
4544         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4545             ifmgd->assoc_data) {
4546                 err = -EBUSY;
4547                 goto err_free;
4548         }
4549
4550         if (ifmgd->auth_data)
4551                 ieee80211_destroy_auth_data(sdata, false);
4552
4553         /* prep auth_data so we don't go into idle on disassoc */
4554         ifmgd->auth_data = auth_data;
4555
4556         if (ifmgd->associated) {
4557                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4558
4559                 sdata_info(sdata,
4560                            "disconnect from AP %pM for new auth to %pM\n",
4561                            ifmgd->associated->bssid, req->bss->bssid);
4562                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4563                                        WLAN_REASON_UNSPECIFIED,
4564                                        false, frame_buf);
4565
4566                 ieee80211_report_disconnect(sdata, frame_buf,
4567                                             sizeof(frame_buf), true,
4568                                             WLAN_REASON_UNSPECIFIED);
4569         }
4570
4571         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4572
4573         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4574         if (err)
4575                 goto err_clear;
4576
4577         err = ieee80211_auth(sdata);
4578         if (err) {
4579                 sta_info_destroy_addr(sdata, req->bss->bssid);
4580                 goto err_clear;
4581         }
4582
4583         /* hold our own reference */
4584         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4585         return 0;
4586
4587  err_clear:
4588         eth_zero_addr(ifmgd->bssid);
4589         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4590         ifmgd->auth_data = NULL;
4591         mutex_lock(&sdata->local->mtx);
4592         ieee80211_vif_release_channel(sdata);
4593         mutex_unlock(&sdata->local->mtx);
4594  err_free:
4595         kfree(auth_data);
4596         return err;
4597 }
4598
4599 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4600                         struct cfg80211_assoc_request *req)
4601 {
4602         struct ieee80211_local *local = sdata->local;
4603         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4604         struct ieee80211_bss *bss = (void *)req->bss->priv;
4605         struct ieee80211_mgd_assoc_data *assoc_data;
4606         const struct cfg80211_bss_ies *beacon_ies;
4607         struct ieee80211_supported_band *sband;
4608         const u8 *ssidie, *ht_ie, *vht_ie;
4609         int i, err;
4610         bool override = false;
4611
4612         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4613         if (!assoc_data)
4614                 return -ENOMEM;
4615
4616         rcu_read_lock();
4617         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4618         if (!ssidie) {
4619                 rcu_read_unlock();
4620                 kfree(assoc_data);
4621                 return -EINVAL;
4622         }
4623         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4624         assoc_data->ssid_len = ssidie[1];
4625         rcu_read_unlock();
4626
4627         if (ifmgd->associated) {
4628                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4629
4630                 sdata_info(sdata,
4631                            "disconnect from AP %pM for new assoc to %pM\n",
4632                            ifmgd->associated->bssid, req->bss->bssid);
4633                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4634                                        WLAN_REASON_UNSPECIFIED,
4635                                        false, frame_buf);
4636
4637                 ieee80211_report_disconnect(sdata, frame_buf,
4638                                             sizeof(frame_buf), true,
4639                                             WLAN_REASON_UNSPECIFIED);
4640         }
4641
4642         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4643                 err = -EBUSY;
4644                 goto err_free;
4645         }
4646
4647         if (ifmgd->assoc_data) {
4648                 err = -EBUSY;
4649                 goto err_free;
4650         }
4651
4652         if (ifmgd->auth_data) {
4653                 bool match;
4654
4655                 /* keep sta info, bssid if matching */
4656                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4657                 ieee80211_destroy_auth_data(sdata, match);
4658         }
4659
4660         /* prepare assoc data */
4661
4662         ifmgd->beacon_crc_valid = false;
4663
4664         assoc_data->wmm = bss->wmm_used &&
4665                           (local->hw.queues >= IEEE80211_NUM_ACS);
4666
4667         /*
4668          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4669          * We still associate in non-HT mode (11a/b/g) if any one of these
4670          * ciphers is configured as pairwise.
4671          * We can set this to true for non-11n hardware, that'll be checked
4672          * separately along with the peer capabilities.
4673          */
4674         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4675                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4676                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4677                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4678                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4679                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4680                         netdev_info(sdata->dev,
4681                                     "disabling HT/VHT due to WEP/TKIP use\n");
4682                 }
4683         }
4684
4685         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4686         sband = local->hw.wiphy->bands[req->bss->channel->band];
4687         if (!sband->ht_cap.ht_supported ||
4688             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4689             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4690                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4691                 if (!bss->wmm_used &&
4692                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4693                         netdev_info(sdata->dev,
4694                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4695         }
4696
4697         /* disable VHT if we don't support it or the AP doesn't use WMM */
4698         if (!sband->vht_cap.vht_supported ||
4699             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4700             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4701                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4702                 if (!bss->wmm_used &&
4703                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4704                         netdev_info(sdata->dev,
4705                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4706         }
4707
4708         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4709         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4710                sizeof(ifmgd->ht_capa_mask));
4711
4712         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4713         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4714                sizeof(ifmgd->vht_capa_mask));
4715
4716         if (req->ie && req->ie_len) {
4717                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4718                 assoc_data->ie_len = req->ie_len;
4719         }
4720
4721         if (req->fils_kek) {
4722                 /* should already be checked in cfg80211 - so warn */
4723                 if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
4724                         err = -EINVAL;
4725                         goto err_free;
4726                 }
4727                 memcpy(assoc_data->fils_kek, req->fils_kek,
4728                        req->fils_kek_len);
4729                 assoc_data->fils_kek_len = req->fils_kek_len;
4730         }
4731
4732         if (req->fils_nonces)
4733                 memcpy(assoc_data->fils_nonces, req->fils_nonces,
4734                        2 * FILS_NONCE_LEN);
4735
4736         assoc_data->bss = req->bss;
4737
4738         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4739                 if (ifmgd->powersave)
4740                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4741                 else
4742                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4743         } else
4744                 sdata->smps_mode = ifmgd->req_smps;
4745
4746         assoc_data->capability = req->bss->capability;
4747         assoc_data->supp_rates = bss->supp_rates;
4748         assoc_data->supp_rates_len = bss->supp_rates_len;
4749
4750         rcu_read_lock();
4751         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4752         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4753                 assoc_data->ap_ht_param =
4754                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4755         else
4756                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4757         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4758         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4759                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4760                        sizeof(struct ieee80211_vht_cap));
4761         else
4762                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4763         rcu_read_unlock();
4764
4765         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4766                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4767              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4768                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4769
4770         if (bss->wmm_used && bss->uapsd_supported &&
4771             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4772                 assoc_data->uapsd = true;
4773                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4774         } else {
4775                 assoc_data->uapsd = false;
4776                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4777         }
4778
4779         if (req->prev_bssid)
4780                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4781
4782         if (req->use_mfp) {
4783                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4784                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4785         } else {
4786                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4787                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4788         }
4789
4790         if (req->flags & ASSOC_REQ_USE_RRM)
4791                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4792         else
4793                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4794
4795         if (req->crypto.control_port)
4796                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4797         else
4798                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4799
4800         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4801         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4802         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4803                                                         sdata->vif.type);
4804
4805         /* kick off associate process */
4806
4807         ifmgd->assoc_data = assoc_data;
4808         ifmgd->dtim_period = 0;
4809         ifmgd->have_beacon = false;
4810
4811         /* override HT/VHT configuration only if the AP and we support it */
4812         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4813                 struct ieee80211_sta_ht_cap sta_ht_cap;
4814
4815                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4816                         override = true;
4817
4818                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4819                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4820
4821                 /* check for 40 MHz disable override */
4822                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4823                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4824                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4825                         override = true;
4826
4827                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4828                     req->flags & ASSOC_REQ_DISABLE_VHT)
4829                         override = true;
4830         }
4831
4832         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4833                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4834                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4835         }
4836
4837         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4838                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4839
4840         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4841         if (err)
4842                 goto err_clear;
4843
4844         rcu_read_lock();
4845         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4846
4847         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4848             !beacon_ies) {
4849                 /*
4850                  * Wait up to one beacon interval ...
4851                  * should this be more if we miss one?
4852                  */
4853                 sdata_info(sdata, "waiting for beacon from %pM\n",
4854                            ifmgd->bssid);
4855                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4856                 assoc_data->timeout_started = true;
4857                 assoc_data->need_beacon = true;
4858         } else if (beacon_ies) {
4859                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4860                                                     beacon_ies->data,
4861                                                     beacon_ies->len);
4862                 u8 dtim_count = 0;
4863
4864                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4865                         const struct ieee80211_tim_ie *tim;
4866                         tim = (void *)(tim_ie + 2);
4867                         ifmgd->dtim_period = tim->dtim_period;
4868                         dtim_count = tim->dtim_count;
4869                 }
4870                 ifmgd->have_beacon = true;
4871                 assoc_data->timeout = jiffies;
4872                 assoc_data->timeout_started = true;
4873
4874                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4875                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4876                         sdata->vif.bss_conf.sync_device_ts =
4877                                 bss->device_ts_beacon;
4878                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4879                 }
4880         } else {
4881                 assoc_data->timeout = jiffies;
4882                 assoc_data->timeout_started = true;
4883         }
4884         rcu_read_unlock();
4885
4886         run_again(sdata, assoc_data->timeout);
4887
4888         if (bss->corrupt_data) {
4889                 char *corrupt_type = "data";
4890                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4891                         if (bss->corrupt_data &
4892                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4893                                 corrupt_type = "beacon and probe response";
4894                         else
4895                                 corrupt_type = "beacon";
4896                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4897                         corrupt_type = "probe response";
4898                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4899                            corrupt_type);
4900         }
4901
4902         return 0;
4903  err_clear:
4904         eth_zero_addr(ifmgd->bssid);
4905         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4906         ifmgd->assoc_data = NULL;
4907  err_free:
4908         kfree(assoc_data);
4909         return err;
4910 }
4911
4912 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4913                          struct cfg80211_deauth_request *req)
4914 {
4915         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4916         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4917         bool tx = !req->local_state_change;
4918
4919         if (ifmgd->auth_data &&
4920             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4921                 sdata_info(sdata,
4922                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4923                            req->bssid, req->reason_code,
4924                            ieee80211_get_reason_code_string(req->reason_code));
4925
4926                 drv_mgd_prepare_tx(sdata->local, sdata);
4927                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4928                                                IEEE80211_STYPE_DEAUTH,
4929                                                req->reason_code, tx,
4930                                                frame_buf);
4931                 ieee80211_destroy_auth_data(sdata, false);
4932                 ieee80211_report_disconnect(sdata, frame_buf,
4933                                             sizeof(frame_buf), true,
4934                                             req->reason_code);
4935
4936                 return 0;
4937         }
4938
4939         if (ifmgd->assoc_data &&
4940             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4941                 sdata_info(sdata,
4942                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
4943                            req->bssid, req->reason_code,
4944                            ieee80211_get_reason_code_string(req->reason_code));
4945
4946                 drv_mgd_prepare_tx(sdata->local, sdata);
4947                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4948                                                IEEE80211_STYPE_DEAUTH,
4949                                                req->reason_code, tx,
4950                                                frame_buf);
4951                 ieee80211_destroy_assoc_data(sdata, false, true);
4952                 ieee80211_report_disconnect(sdata, frame_buf,
4953                                             sizeof(frame_buf), true,
4954                                             req->reason_code);
4955                 return 0;
4956         }
4957
4958         if (ifmgd->associated &&
4959             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4960                 sdata_info(sdata,
4961                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4962                            req->bssid, req->reason_code,
4963                            ieee80211_get_reason_code_string(req->reason_code));
4964
4965                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4966                                        req->reason_code, tx, frame_buf);
4967                 ieee80211_report_disconnect(sdata, frame_buf,
4968                                             sizeof(frame_buf), true,
4969                                             req->reason_code);
4970                 return 0;
4971         }
4972
4973         return -ENOTCONN;
4974 }
4975
4976 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4977                            struct cfg80211_disassoc_request *req)
4978 {
4979         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4980         u8 bssid[ETH_ALEN];
4981         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4982
4983         /*
4984          * cfg80211 should catch this ... but it's racy since
4985          * we can receive a disassoc frame, process it, hand it
4986          * to cfg80211 while that's in a locked section already
4987          * trying to tell us that the user wants to disconnect.
4988          */
4989         if (ifmgd->associated != req->bss)
4990                 return -ENOLINK;
4991
4992         sdata_info(sdata,
4993                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4994                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4995
4996         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4997         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4998                                req->reason_code, !req->local_state_change,
4999                                frame_buf);
5000
5001         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5002                                     req->reason_code);
5003
5004         return 0;
5005 }
5006
5007 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5008 {
5009         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5010
5011         /*
5012          * Make sure some work items will not run after this,
5013          * they will not do anything but might not have been
5014          * cancelled when disconnecting.
5015          */
5016         cancel_work_sync(&ifmgd->monitor_work);
5017         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5018         cancel_work_sync(&ifmgd->request_smps_work);
5019         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5020         cancel_work_sync(&ifmgd->chswitch_work);
5021         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5022
5023         sdata_lock(sdata);
5024         if (ifmgd->assoc_data) {
5025                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5026                 ieee80211_destroy_assoc_data(sdata, false, false);
5027                 cfg80211_assoc_timeout(sdata->dev, bss);
5028         }
5029         if (ifmgd->auth_data)
5030                 ieee80211_destroy_auth_data(sdata, false);
5031         spin_lock_bh(&ifmgd->teardown_lock);
5032         if (ifmgd->teardown_skb) {
5033                 kfree_skb(ifmgd->teardown_skb);
5034                 ifmgd->teardown_skb = NULL;
5035                 ifmgd->orig_teardown_skb = NULL;
5036         }
5037         spin_unlock_bh(&ifmgd->teardown_lock);
5038         del_timer_sync(&ifmgd->timer);
5039         sdata_unlock(sdata);
5040 }
5041
5042 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5043                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5044                                gfp_t gfp)
5045 {
5046         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5047
5048         trace_api_cqm_rssi_notify(sdata, rssi_event);
5049
5050         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5051 }
5052 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5053
5054 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5055 {
5056         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5057
5058         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5059
5060         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5061 }
5062 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);