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  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  34 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  35 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  36 #define IEEE80211_AUTH_MAX_TRIES        3
  37 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  38 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  39 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  40 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  41 #define IEEE80211_ASSOC_MAX_TRIES       3
  42
  43 static int max_nullfunc_tries = 2;
  44 module_param(max_nullfunc_tries, int, 0644);
  45 MODULE_PARM_DESC(max_nullfunc_tries,
  46                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  47
  48 static int max_probe_tries = 5;
  49 module_param(max_probe_tries, int, 0644);
  50 MODULE_PARM_DESC(max_probe_tries,
  51                  "Maximum probe tries before disconnecting (reason 4).");
  52
  53 /*
  54  * Beacon loss timeout is calculated as N frames times the
  55  * advertised beacon interval.  This may need to be somewhat
  56  * higher than what hardware might detect to account for
  57  * delays in the host processing frames. But since we also
  58  * probe on beacon miss before declaring the connection lost
  59  * default to what we want.
  60  */
  61 static int beacon_loss_count = 7;
  62 module_param(beacon_loss_count, int, 0644);
  63 MODULE_PARM_DESC(beacon_loss_count,
  64                  "Number of beacon intervals before we decide beacon was lost.");
  65
  66 /*
  67  * Time the connection can be idle before we probe
  68  * it to see if we can still talk to the AP.
  69  */
  70 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  71 /*
  72  * Time we wait for a probe response after sending
  73  * a probe request because of beacon loss or for
  74  * checking the connection still works.
  75  */
  76 static int probe_wait_ms = 500;
  77 module_param(probe_wait_ms, int, 0644);
  78 MODULE_PARM_DESC(probe_wait_ms,
  79                  "Maximum time(ms) to wait for probe response"
  80                  " before disconnecting (reason 4).");
  81
  82 /*
  83  * Weight given to the latest Beacon frame when calculating average signal
  84  * strength for Beacon frames received in the current BSS. This must be
  85  * between 1 and 15.
  86  */
  87 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  88
  89 /*
  90  * How many Beacon frames need to have been used in average signal strength
  91  * before starting to indicate signal change events.
  92  */
  93 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  94
  95 /*
  96  * We can have multiple work items (and connection probing)
  97  * scheduling this timer, but we need to take care to only
  98  * reschedule it when it should fire _earlier_ than it was
  99  * asked for before, or if it's not pending right now. This
 100  * function ensures that. Note that it then is required to
 101  * run this function for all timeouts after the first one
 102  * has happened -- the work that runs from this timer will
 103  * do that.
 104  */
 105 static void run_again(struct ieee80211_sub_if_data *sdata,
 106                       unsigned long timeout)
 107 {
 108         sdata_assert_lock(sdata);
 109
 110         if (!timer_pending(&sdata->u.mgd.timer) ||
 111             time_before(timeout, sdata->u.mgd.timer.expires))
 112                 mod_timer(&sdata->u.mgd.timer, timeout);
 113 }
 114
 115 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 116 {
 117         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 118                 return;
 119
 120         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 121                 return;
 122
 123         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 124                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 125 }
 126
 127 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 128 {
 129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 130
 131         if (unlikely(!sdata->u.mgd.associated))
 132                 return;
 133
 134         ifmgd->probe_send_count = 0;
 135
 136         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 137                 return;
 138
 139         mod_timer(&sdata->u.mgd.conn_mon_timer,
 140                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 141 }
 142
 143 static int ecw2cw(int ecw)
 144 {
 145         return (1 << ecw) - 1;
 146 }
 147
 148 static u32
 149 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 150                              struct ieee80211_supported_band *sband,
 151                              struct ieee80211_channel *channel,
 152                              const struct ieee80211_ht_operation *ht_oper,
 153                              const struct ieee80211_vht_operation *vht_oper,
 154                              struct cfg80211_chan_def *chandef, bool tracking)
 155 {
 156         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 157         struct cfg80211_chan_def vht_chandef;
 158         u32 ht_cfreq, ret;
 159
 160         chandef->chan = channel;
 161         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 162         chandef->center_freq1 = channel->center_freq;
 163         chandef->center_freq2 = 0;
 164
 165         if (!ht_oper || !sband->ht_cap.ht_supported) {
 166                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 167                 goto out;
 168         }
 169
 170         chandef->width = NL80211_CHAN_WIDTH_20;
 171
 172         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 173                                                   channel->band);
 174         /* check that channel matches the right operating channel */
 175         if (!tracking && channel->center_freq != ht_cfreq) {
 176                 /*
 177                  * It's possible that some APs are confused here;
 178                  * Netgear WNDR3700 sometimes reports 4 higher than
 179                  * the actual channel in association responses, but
 180                  * since we look at probe response/beacon data here
 181                  * it should be OK.
 182                  */
 183                 sdata_info(sdata,
 184                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 185                            channel->center_freq, ht_cfreq,
 186                            ht_oper->primary_chan, channel->band);
 187                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 188                 goto out;
 189         }
 190
 191         /* check 40 MHz support, if we have it */
 192         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 193                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 194                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 195                         chandef->width = NL80211_CHAN_WIDTH_40;
 196                         chandef->center_freq1 += 10;
 197                         break;
 198                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 199                         chandef->width = NL80211_CHAN_WIDTH_40;
 200                         chandef->center_freq1 -= 10;
 201                         break;
 202                 }
 203         } else {
 204                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 205                 ret = IEEE80211_STA_DISABLE_VHT;
 206                 /* also mark 40 MHz disabled */
 207                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 208                 goto out;
 209         }
 210
 211         if (!vht_oper || !sband->vht_cap.vht_supported) {
 212                 ret = IEEE80211_STA_DISABLE_VHT;
 213                 goto out;
 214         }
 215
 216         vht_chandef.chan = channel;
 217         vht_chandef.center_freq1 =
 218                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 219                                                channel->band);
 220         vht_chandef.center_freq2 = 0;
 221
 222         switch (vht_oper->chan_width) {
 223         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 224                 vht_chandef.width = chandef->width;
 225                 vht_chandef.center_freq1 = chandef->center_freq1;
 226                 break;
 227         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 228                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 229                 break;
 230         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 231                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 232                 break;
 233         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 234                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 235                 vht_chandef.center_freq2 =
 236                         ieee80211_channel_to_frequency(
 237                                 vht_oper->center_freq_seg2_idx,
 238                                 channel->band);
 239                 break;
 240         default:
 241                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 242                         sdata_info(sdata,
 243                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 244                                    vht_oper->chan_width);
 245                 ret = IEEE80211_STA_DISABLE_VHT;
 246                 goto out;
 247         }
 248
 249         if (!cfg80211_chandef_valid(&vht_chandef)) {
 250                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 251                         sdata_info(sdata,
 252                                    "AP VHT information is invalid, disable VHT\n");
 253                 ret = IEEE80211_STA_DISABLE_VHT;
 254                 goto out;
 255         }
 256
 257         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 258                 ret = 0;
 259                 goto out;
 260         }
 261
 262         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 263                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 264                         sdata_info(sdata,
 265                                    "AP VHT information doesn't match HT, disable VHT\n");
 266                 ret = IEEE80211_STA_DISABLE_VHT;
 267                 goto out;
 268         }
 269
 270         *chandef = vht_chandef;
 271
 272         ret = 0;
 273
 274 out:
 275         /*
 276          * When tracking the current AP, don't do any further checks if the
 277          * new chandef is identical to the one we're currently using for the
 278          * connection. This keeps us from playing ping-pong with regulatory,
 279          * without it the following can happen (for example):
 280          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 281          *  - AP advertises regdom US
 282          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 283          *  - the code below detects an unsupported channel, downgrades, and
 284          *    we disconnect from the AP in the caller
 285          *  - disconnect causes CRDA to reload world regdomain and the game
 286          *    starts anew.
 287          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 288          *
 289          * It seems possible that there are still scenarios with CSA or real
 290          * bandwidth changes where a this could happen, but those cases are
 291          * less common and wouldn't completely prevent using the AP.
 292          */
 293         if (tracking &&
 294             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 295                 return ret;
 296
 297         /* don't print the message below for VHT mismatch if VHT is disabled */
 298         if (ret & IEEE80211_STA_DISABLE_VHT)
 299                 vht_chandef = *chandef;
 300
 301         /*
 302          * Ignore the DISABLED flag when we're already connected and only
 303          * tracking the APs beacon for bandwidth changes - otherwise we
 304          * might get disconnected here if we connect to an AP, update our
 305          * regulatory information based on the AP's country IE and the
 306          * information we have is wrong/outdated and disables the channel
 307          * that we're actually using for the connection to the AP.
 308          */
 309         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 310                                         tracking ? 0 :
 311                                                    IEEE80211_CHAN_DISABLED)) {
 312                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 313                         ret = IEEE80211_STA_DISABLE_HT |
 314                               IEEE80211_STA_DISABLE_VHT;
 315                         break;
 316                 }
 317
 318                 ret |= ieee80211_chandef_downgrade(chandef);
 319         }
 320
 321         if (chandef->width != vht_chandef.width && !tracking)
 322                 sdata_info(sdata,
 323                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 324
 325         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 326         return ret;
 327 }
 328
 329 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 330                                struct sta_info *sta,
 331                                const struct ieee80211_ht_operation *ht_oper,
 332                                const struct ieee80211_vht_operation *vht_oper,
 333                                const u8 *bssid, u32 *changed)
 334 {
 335         struct ieee80211_local *local = sdata->local;
 336         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 337         struct ieee80211_supported_band *sband;
 338         struct ieee80211_channel *chan;
 339         struct cfg80211_chan_def chandef;
 340         u16 ht_opmode;
 341         u32 flags;
 342         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 343         int ret;
 344
 345         /* if HT was/is disabled, don't track any bandwidth changes */
 346         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 347                 return 0;
 348
 349         /* don't check VHT if we associated as non-VHT station */
 350         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 351                 vht_oper = NULL;
 352
 353         if (WARN_ON_ONCE(!sta))
 354                 return -EINVAL;
 355
 356         /*
 357          * if bss configuration changed store the new one -
 358          * this may be applicable even if channel is identical
 359          */
 360         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 361         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 362                 *changed |= BSS_CHANGED_HT;
 363                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 364         }
 365
 366         chan = sdata->vif.bss_conf.chandef.chan;
 367         sband = local->hw.wiphy->bands[chan->band];
 368
 369         /* calculate new channel (type) based on HT/VHT operation IEs */
 370         flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
 371                                              vht_oper, &chandef, true);
 372
 373         /*
 374          * Downgrade the new channel if we associated with restricted
 375          * capabilities. For example, if we associated as a 20 MHz STA
 376          * to a 40 MHz AP (due to regulatory, capabilities or config
 377          * reasons) then switching to a 40 MHz channel now won't do us
 378          * any good -- we couldn't use it with the AP.
 379          */
 380         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 381             chandef.width == NL80211_CHAN_WIDTH_80P80)
 382                 flags |= ieee80211_chandef_downgrade(&chandef);
 383         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 384             chandef.width == NL80211_CHAN_WIDTH_160)
 385                 flags |= ieee80211_chandef_downgrade(&chandef);
 386         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 387             chandef.width > NL80211_CHAN_WIDTH_20)
 388                 flags |= ieee80211_chandef_downgrade(&chandef);
 389
 390         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 391                 return 0;
 392
 393         sdata_info(sdata,
 394                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 395                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 396                    chandef.center_freq1, chandef.center_freq2);
 397
 398         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 399                                       IEEE80211_STA_DISABLE_VHT |
 400                                       IEEE80211_STA_DISABLE_40MHZ |
 401                                       IEEE80211_STA_DISABLE_80P80MHZ |
 402                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 403             !cfg80211_chandef_valid(&chandef)) {
 404                 sdata_info(sdata,
 405                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 406                            ifmgd->bssid);
 407                 return -EINVAL;
 408         }
 409
 410         switch (chandef.width) {
 411         case NL80211_CHAN_WIDTH_20_NOHT:
 412         case NL80211_CHAN_WIDTH_20:
 413                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 414                 break;
 415         case NL80211_CHAN_WIDTH_40:
 416                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 417                 break;
 418         case NL80211_CHAN_WIDTH_80:
 419                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 420                 break;
 421         case NL80211_CHAN_WIDTH_80P80:
 422         case NL80211_CHAN_WIDTH_160:
 423                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 424                 break;
 425         default:
 426                 return -EINVAL;
 427         }
 428
 429         if (new_sta_bw > sta->cur_max_bandwidth)
 430                 new_sta_bw = sta->cur_max_bandwidth;
 431
 432         if (new_sta_bw < sta->sta.bandwidth) {
 433                 sta->sta.bandwidth = new_sta_bw;
 434                 rate_control_rate_update(local, sband, sta,
 435                                          IEEE80211_RC_BW_CHANGED);
 436         }
 437
 438         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 439         if (ret) {
 440                 sdata_info(sdata,
 441                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 442                            ifmgd->bssid);
 443                 return ret;
 444         }
 445
 446         if (new_sta_bw > sta->sta.bandwidth) {
 447                 sta->sta.bandwidth = new_sta_bw;
 448                 rate_control_rate_update(local, sband, sta,
 449                                          IEEE80211_RC_BW_CHANGED);
 450         }
 451
 452         return 0;
 453 }
 454
 455 /* frame sending functions */
 456
 457 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 458                                 struct sk_buff *skb, u8 ap_ht_param,
 459                                 struct ieee80211_supported_band *sband,
 460                                 struct ieee80211_channel *channel,
 461                                 enum ieee80211_smps_mode smps)
 462 {
 463         u8 *pos;
 464         u32 flags = channel->flags;
 465         u16 cap;
 466         struct ieee80211_sta_ht_cap ht_cap;
 467
 468         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 469
 470         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 471         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 472
 473         /* determine capability flags */
 474         cap = ht_cap.cap;
 475
 476         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 477         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 478                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 479                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 480                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 481                 }
 482                 break;
 483         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 484                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 485                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 486                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 487                 }
 488                 break;
 489         }
 490
 491         /*
 492          * If 40 MHz was disabled associate as though we weren't
 493          * capable of 40 MHz -- some broken APs will never fall
 494          * back to trying to transmit in 20 MHz.
 495          */
 496         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 497                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 498                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 499         }
 500
 501         /* set SM PS mode properly */
 502         cap &= ~IEEE80211_HT_CAP_SM_PS;
 503         switch (smps) {
 504         case IEEE80211_SMPS_AUTOMATIC:
 505         case IEEE80211_SMPS_NUM_MODES:
 506                 WARN_ON(1);
 507         case IEEE80211_SMPS_OFF:
 508                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 509                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 510                 break;
 511         case IEEE80211_SMPS_STATIC:
 512                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 513                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 514                 break;
 515         case IEEE80211_SMPS_DYNAMIC:
 516                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 517                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 518                 break;
 519         }
 520
 521         /* reserve and fill IE */
 522         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 523         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 524 }
 525
 526 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 527                                  struct sk_buff *skb,
 528                                  struct ieee80211_supported_band *sband,
 529                                  struct ieee80211_vht_cap *ap_vht_cap)
 530 {
 531         u8 *pos;
 532         u32 cap;
 533         struct ieee80211_sta_vht_cap vht_cap;
 534         u32 mask, ap_bf_sts, our_bf_sts;
 535
 536         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 537
 538         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 539         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 540
 541         /* determine capability flags */
 542         cap = vht_cap.cap;
 543
 544         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 545                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 546                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 547         }
 548
 549         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 550                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 551                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 552         }
 553
 554         /*
 555          * Some APs apparently get confused if our capabilities are better
 556          * than theirs, so restrict what we advertise in the assoc request.
 557          */
 558         if (!(ap_vht_cap->vht_cap_info &
 559                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 560                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 561
 562         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 563
 564         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 565         our_bf_sts = cap & mask;
 566
 567         if (ap_bf_sts < our_bf_sts) {
 568                 cap &= ~mask;
 569                 cap |= ap_bf_sts;
 570         }
 571
 572         /* reserve and fill IE */
 573         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 574         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 575 }
 576
 577 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 578 {
 579         struct ieee80211_local *local = sdata->local;
 580         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 581         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 582         struct sk_buff *skb;
 583         struct ieee80211_mgmt *mgmt;
 584         u8 *pos, qos_info;
 585         size_t offset = 0, noffset;
 586         int i, count, rates_len, supp_rates_len, shift;
 587         u16 capab;
 588         struct ieee80211_supported_band *sband;
 589         struct ieee80211_chanctx_conf *chanctx_conf;
 590         struct ieee80211_channel *chan;
 591         u32 rate_flags, rates = 0;
 592
 593         sdata_assert_lock(sdata);
 594
 595         rcu_read_lock();
 596         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 597         if (WARN_ON(!chanctx_conf)) {
 598                 rcu_read_unlock();
 599                 return;
 600         }
 601         chan = chanctx_conf->def.chan;
 602         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 603         rcu_read_unlock();
 604         sband = local->hw.wiphy->bands[chan->band];
 605         shift = ieee80211_vif_get_shift(&sdata->vif);
 606
 607         if (assoc_data->supp_rates_len) {
 608                 /*
 609                  * Get all rates supported by the device and the AP as
 610                  * some APs don't like getting a superset of their rates
 611                  * in the association request (e.g. D-Link DAP 1353 in
 612                  * b-only mode)...
 613                  */
 614                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 615                                                      assoc_data->supp_rates,
 616                                                      assoc_data->supp_rates_len,
 617                                                      &rates);
 618         } else {
 619                 /*
 620                  * In case AP not provide any supported rates information
 621                  * before association, we send information element(s) with
 622                  * all rates that we support.
 623                  */
 624                 rates_len = 0;
 625                 for (i = 0; i < sband->n_bitrates; i++) {
 626                         if ((rate_flags & sband->bitrates[i].flags)
 627                             != rate_flags)
 628                                 continue;
 629                         rates |= BIT(i);
 630                         rates_len++;
 631                 }
 632         }
 633
 634         skb = alloc_skb(local->hw.extra_tx_headroom +
 635                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 636                         2 + assoc_data->ssid_len + /* SSID */
 637                         4 + rates_len + /* (extended) rates */
 638                         4 + /* power capability */
 639                         2 + 2 * sband->n_channels + /* supported channels */
 640                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 641                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 642                         assoc_data->ie_len + /* extra IEs */
 643                         9, /* WMM */
 644                         GFP_KERNEL);
 645         if (!skb)
 646                 return;
 647
 648         skb_reserve(skb, local->hw.extra_tx_headroom);
 649
 650         capab = WLAN_CAPABILITY_ESS;
 651
 652         if (sband->band == IEEE80211_BAND_2GHZ) {
 653                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 654                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 655                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 656                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 657         }
 658
 659         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 660                 capab |= WLAN_CAPABILITY_PRIVACY;
 661
 662         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 663             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 664                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 665
 666         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 667         memset(mgmt, 0, 24);
 668         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 669         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 670         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 671
 672         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 673                 skb_put(skb, 10);
 674                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 675                                                   IEEE80211_STYPE_REASSOC_REQ);
 676                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 677                 mgmt->u.reassoc_req.listen_interval =
 678                                 cpu_to_le16(local->hw.conf.listen_interval);
 679                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 680                        ETH_ALEN);
 681         } else {
 682                 skb_put(skb, 4);
 683                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 684                                                   IEEE80211_STYPE_ASSOC_REQ);
 685                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 686                 mgmt->u.assoc_req.listen_interval =
 687                                 cpu_to_le16(local->hw.conf.listen_interval);
 688         }
 689
 690         /* SSID */
 691         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 692         *pos++ = WLAN_EID_SSID;
 693         *pos++ = assoc_data->ssid_len;
 694         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 695
 696         /* add all rates which were marked to be used above */
 697         supp_rates_len = rates_len;
 698         if (supp_rates_len > 8)
 699                 supp_rates_len = 8;
 700
 701         pos = skb_put(skb, supp_rates_len + 2);
 702         *pos++ = WLAN_EID_SUPP_RATES;
 703         *pos++ = supp_rates_len;
 704
 705         count = 0;
 706         for (i = 0; i < sband->n_bitrates; i++) {
 707                 if (BIT(i) & rates) {
 708                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 709                                                 5 * (1 << shift));
 710                         *pos++ = (u8) rate;
 711                         if (++count == 8)
 712                                 break;
 713                 }
 714         }
 715
 716         if (rates_len > count) {
 717                 pos = skb_put(skb, rates_len - count + 2);
 718                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 719                 *pos++ = rates_len - count;
 720
 721                 for (i++; i < sband->n_bitrates; i++) {
 722                         if (BIT(i) & rates) {
 723                                 int rate;
 724                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 725                                                     5 * (1 << shift));
 726                                 *pos++ = (u8) rate;
 727                         }
 728                 }
 729         }
 730
 731         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 732                 /* 1. power capabilities */
 733                 pos = skb_put(skb, 4);
 734                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 735                 *pos++ = 2;
 736                 *pos++ = 0; /* min tx power */
 737                  /* max tx power */
 738                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 739
 740                 /* 2. supported channels */
 741                 /* TODO: get this in reg domain format */
 742                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 743                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 744                 *pos++ = 2 * sband->n_channels;
 745                 for (i = 0; i < sband->n_channels; i++) {
 746                         *pos++ = ieee80211_frequency_to_channel(
 747                                         sband->channels[i].center_freq);
 748                         *pos++ = 1; /* one channel in the subband*/
 749                 }
 750         }
 751
 752         /* if present, add any custom IEs that go before HT */
 753         if (assoc_data->ie_len) {
 754                 static const u8 before_ht[] = {
 755                         WLAN_EID_SSID,
 756                         WLAN_EID_SUPP_RATES,
 757                         WLAN_EID_EXT_SUPP_RATES,
 758                         WLAN_EID_PWR_CAPABILITY,
 759                         WLAN_EID_SUPPORTED_CHANNELS,
 760                         WLAN_EID_RSN,
 761                         WLAN_EID_QOS_CAPA,
 762                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 763                         WLAN_EID_MOBILITY_DOMAIN,
 764                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 765                 };
 766                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 767                                              before_ht, ARRAY_SIZE(before_ht),
 768                                              offset);
 769                 pos = skb_put(skb, noffset - offset);
 770                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 771                 offset = noffset;
 772         }
 773
 774         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 775                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 776                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 777
 778         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 779                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 780                                     sband, chan, sdata->smps_mode);
 781
 782         /* if present, add any custom IEs that go before VHT */
 783         if (assoc_data->ie_len) {
 784                 static const u8 before_vht[] = {
 785                         WLAN_EID_SSID,
 786                         WLAN_EID_SUPP_RATES,
 787                         WLAN_EID_EXT_SUPP_RATES,
 788                         WLAN_EID_PWR_CAPABILITY,
 789                         WLAN_EID_SUPPORTED_CHANNELS,
 790                         WLAN_EID_RSN,
 791                         WLAN_EID_QOS_CAPA,
 792                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 793                         WLAN_EID_MOBILITY_DOMAIN,
 794                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 795                         WLAN_EID_HT_CAPABILITY,
 796                         WLAN_EID_BSS_COEX_2040,
 797                         WLAN_EID_EXT_CAPABILITY,
 798                         WLAN_EID_QOS_TRAFFIC_CAPA,
 799                         WLAN_EID_TIM_BCAST_REQ,
 800                         WLAN_EID_INTERWORKING,
 801                 };
 802                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 803                                              before_vht, ARRAY_SIZE(before_vht),
 804                                              offset);
 805                 pos = skb_put(skb, noffset - offset);
 806                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 807                 offset = noffset;
 808         }
 809
 810         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 811                 ieee80211_add_vht_ie(sdata, skb, sband,
 812                                      &assoc_data->ap_vht_cap);
 813
 814         /* if present, add any custom non-vendor IEs that go after HT */
 815         if (assoc_data->ie_len) {
 816                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 817                                                     assoc_data->ie_len,
 818                                                     offset);
 819                 pos = skb_put(skb, noffset - offset);
 820                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 821                 offset = noffset;
 822         }
 823
 824         if (assoc_data->wmm) {
 825                 if (assoc_data->uapsd) {
 826                         qos_info = ifmgd->uapsd_queues;
 827                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 828                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 829                 } else {
 830                         qos_info = 0;
 831                 }
 832
 833                 pos = skb_put(skb, 9);
 834                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 835                 *pos++ = 7; /* len */
 836                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 837                 *pos++ = 0x50;
 838                 *pos++ = 0xf2;
 839                 *pos++ = 2; /* WME */
 840                 *pos++ = 0; /* WME info */
 841                 *pos++ = 1; /* WME ver */
 842                 *pos++ = qos_info;
 843         }
 844
 845         /* add any remaining custom (i.e. vendor specific here) IEs */
 846         if (assoc_data->ie_len) {
 847                 noffset = assoc_data->ie_len;
 848                 pos = skb_put(skb, noffset - offset);
 849                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 850         }
 851
 852         drv_mgd_prepare_tx(local, sdata);
 853
 854         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 855         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 856                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 857                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 858         ieee80211_tx_skb(sdata, skb);
 859 }
 860
 861 void ieee80211_send_pspoll(struct ieee80211_local *local,
 862                            struct ieee80211_sub_if_data *sdata)
 863 {
 864         struct ieee80211_pspoll *pspoll;
 865         struct sk_buff *skb;
 866
 867         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 868         if (!skb)
 869                 return;
 870
 871         pspoll = (struct ieee80211_pspoll *) skb->data;
 872         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 873
 874         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 875         ieee80211_tx_skb(sdata, skb);
 876 }
 877
 878 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 879                              struct ieee80211_sub_if_data *sdata,
 880                              int powersave)
 881 {
 882         struct sk_buff *skb;
 883         struct ieee80211_hdr_3addr *nullfunc;
 884         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 885
 886         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 887         if (!skb)
 888                 return;
 889
 890         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 891         if (powersave)
 892                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 893
 894         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 895                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 896
 897         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 898                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 899
 900         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 901                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 902
 903         ieee80211_tx_skb(sdata, skb);
 904 }
 905
 906 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 907                                           struct ieee80211_sub_if_data *sdata)
 908 {
 909         struct sk_buff *skb;
 910         struct ieee80211_hdr *nullfunc;
 911         __le16 fc;
 912
 913         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 914                 return;
 915
 916         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 917         if (!skb)
 918                 return;
 919
 920         skb_reserve(skb, local->hw.extra_tx_headroom);
 921
 922         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 923         memset(nullfunc, 0, 30);
 924         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 925                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 926         nullfunc->frame_control = fc;
 927         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 928         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 929         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 930         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 931
 932         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 933         ieee80211_tx_skb(sdata, skb);
 934 }
 935
 936 /* spectrum management related things */
 937 static void ieee80211_chswitch_work(struct work_struct *work)
 938 {
 939         struct ieee80211_sub_if_data *sdata =
 940                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 941         struct ieee80211_local *local = sdata->local;
 942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 943         int ret;
 944
 945         if (!ieee80211_sdata_running(sdata))
 946                 return;
 947
 948         sdata_lock(sdata);
 949         mutex_lock(&local->mtx);
 950         mutex_lock(&local->chanctx_mtx);
 951
 952         if (!ifmgd->associated)
 953                 goto out;
 954
 955         if (!sdata->vif.csa_active)
 956                 goto out;
 957
 958         /*
 959          * using reservation isn't immediate as it may be deferred until later
 960          * with multi-vif. once reservation is complete it will re-schedule the
 961          * work with no reserved_chanctx so verify chandef to check if it
 962          * completed successfully
 963          */
 964
 965         if (sdata->reserved_chanctx) {
 966                 /*
 967                  * with multi-vif csa driver may call ieee80211_csa_finish()
 968                  * many times while waiting for other interfaces to use their
 969                  * reservations
 970                  */
 971                 if (sdata->reserved_ready)
 972                         goto out;
 973
 974                 ret = ieee80211_vif_use_reserved_context(sdata);
 975                 if (ret) {
 976                         sdata_info(sdata,
 977                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
 978                                    ret);
 979                         ieee80211_queue_work(&sdata->local->hw,
 980                                              &ifmgd->csa_connection_drop_work);
 981                         goto out;
 982                 }
 983
 984                 goto out;
 985         }
 986
 987         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
 988                                         &sdata->csa_chandef)) {
 989                 sdata_info(sdata,
 990                            "failed to finalize channel switch, disconnecting\n");
 991                 ieee80211_queue_work(&sdata->local->hw,
 992                                      &ifmgd->csa_connection_drop_work);
 993                 goto out;
 994         }
 995
 996         /* XXX: shouldn't really modify cfg80211-owned data! */
 997         ifmgd->associated->channel = sdata->csa_chandef.chan;
 998
 999         sdata->vif.csa_active = false;
1000
1001         /* XXX: wait for a beacon first? */
1002         if (sdata->csa_block_tx) {
1003                 ieee80211_wake_vif_queues(local, sdata,
1004                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1005                 sdata->csa_block_tx = false;
1006         }
1007
1008         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1009
1010         ieee80211_sta_reset_beacon_monitor(sdata);
1011         ieee80211_sta_reset_conn_monitor(sdata);
1012
1013 out:
1014         mutex_unlock(&local->chanctx_mtx);
1015         mutex_unlock(&local->mtx);
1016         sdata_unlock(sdata);
1017 }
1018
1019 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1020 {
1021         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1022         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1023
1024         trace_api_chswitch_done(sdata, success);
1025         if (!success) {
1026                 sdata_info(sdata,
1027                            "driver channel switch failed, disconnecting\n");
1028                 ieee80211_queue_work(&sdata->local->hw,
1029                                      &ifmgd->csa_connection_drop_work);
1030         } else {
1031                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1032         }
1033 }
1034 EXPORT_SYMBOL(ieee80211_chswitch_done);
1035
1036 static void ieee80211_chswitch_timer(unsigned long data)
1037 {
1038         struct ieee80211_sub_if_data *sdata =
1039                 (struct ieee80211_sub_if_data *) data;
1040
1041         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1042 }
1043
1044 static void
1045 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1046                                  u64 timestamp, struct ieee802_11_elems *elems,
1047                                  bool beacon)
1048 {
1049         struct ieee80211_local *local = sdata->local;
1050         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1051         struct cfg80211_bss *cbss = ifmgd->associated;
1052         struct ieee80211_chanctx_conf *conf;
1053         struct ieee80211_chanctx *chanctx;
1054         enum ieee80211_band current_band;
1055         struct ieee80211_csa_ie csa_ie;
1056         int res;
1057
1058         sdata_assert_lock(sdata);
1059
1060         if (!cbss)
1061                 return;
1062
1063         if (local->scanning)
1064                 return;
1065
1066         /* disregard subsequent announcements if we are already processing */
1067         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1068                 return;
1069
1070         current_band = cbss->channel->band;
1071         memset(&csa_ie, 0, sizeof(csa_ie));
1072         res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
1073                                            ifmgd->flags,
1074                                            ifmgd->associated->bssid, &csa_ie);
1075         if (res < 0)
1076                 ieee80211_queue_work(&local->hw,
1077                                      &ifmgd->csa_connection_drop_work);
1078         if (res)
1079                 return;
1080
1081         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1082                                      IEEE80211_CHAN_DISABLED)) {
1083                 sdata_info(sdata,
1084                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1085                            ifmgd->associated->bssid,
1086                            csa_ie.chandef.chan->center_freq,
1087                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1088                            csa_ie.chandef.center_freq2);
1089                 ieee80211_queue_work(&local->hw,
1090                                      &ifmgd->csa_connection_drop_work);
1091                 return;
1092         }
1093
1094         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1095
1096         mutex_lock(&local->mtx);
1097         mutex_lock(&local->chanctx_mtx);
1098         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1099                                          lockdep_is_held(&local->chanctx_mtx));
1100         if (!conf) {
1101                 sdata_info(sdata,
1102                            "no channel context assigned to vif?, disconnecting\n");
1103                 ieee80211_queue_work(&local->hw,
1104                                      &ifmgd->csa_connection_drop_work);
1105                 mutex_unlock(&local->chanctx_mtx);
1106                 mutex_unlock(&local->mtx);
1107                 return;
1108         }
1109
1110         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1111
1112         if (local->use_chanctx) {
1113                 u32 num_chanctx = 0;
1114                 list_for_each_entry(chanctx, &local->chanctx_list, list)
1115                        num_chanctx++;
1116
1117                 if (num_chanctx > 1 ||
1118                     !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1119                         sdata_info(sdata,
1120                                    "not handling chan-switch with channel contexts\n");
1121                         ieee80211_queue_work(&local->hw,
1122                                              &ifmgd->csa_connection_drop_work);
1123                         mutex_unlock(&local->chanctx_mtx);
1124                         mutex_unlock(&local->mtx);
1125                         return;
1126                 }
1127         }
1128
1129         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1130                                             chanctx->mode, false);
1131         if (res) {
1132                 sdata_info(sdata,
1133                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1134                            res);
1135                 ieee80211_queue_work(&local->hw,
1136                                      &ifmgd->csa_connection_drop_work);
1137                 mutex_unlock(&local->chanctx_mtx);
1138                 mutex_unlock(&local->mtx);
1139                 return;
1140         }
1141         mutex_unlock(&local->chanctx_mtx);
1142
1143         sdata->vif.csa_active = true;
1144         sdata->csa_chandef = csa_ie.chandef;
1145         sdata->csa_block_tx = csa_ie.mode;
1146
1147         if (sdata->csa_block_tx)
1148                 ieee80211_stop_vif_queues(local, sdata,
1149                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1150         mutex_unlock(&local->mtx);
1151
1152         if (local->ops->channel_switch) {
1153                 /* use driver's channel switch callback */
1154                 struct ieee80211_channel_switch ch_switch = {
1155                         .timestamp = timestamp,
1156                         .block_tx = csa_ie.mode,
1157                         .chandef = csa_ie.chandef,
1158                         .count = csa_ie.count,
1159                 };
1160
1161                 drv_channel_switch(local, &ch_switch);
1162                 return;
1163         }
1164
1165         /* channel switch handled in software */
1166         if (csa_ie.count <= 1)
1167                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1168         else
1169                 mod_timer(&ifmgd->chswitch_timer,
1170                           TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1171 }
1172
1173 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1174                                        struct ieee80211_channel *channel,
1175                                        const u8 *country_ie, u8 country_ie_len,
1176                                        const u8 *pwr_constr_elem)
1177 {
1178         struct ieee80211_country_ie_triplet *triplet;
1179         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1180         int i, chan_pwr, chan_increment, new_ap_level;
1181         bool have_chan_pwr = false;
1182
1183         /* Invalid IE */
1184         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1185                 return 0;
1186
1187         triplet = (void *)(country_ie + 3);
1188         country_ie_len -= 3;
1189
1190         switch (channel->band) {
1191         default:
1192                 WARN_ON_ONCE(1);
1193                 /* fall through */
1194         case IEEE80211_BAND_2GHZ:
1195         case IEEE80211_BAND_60GHZ:
1196                 chan_increment = 1;
1197                 break;
1198         case IEEE80211_BAND_5GHZ:
1199                 chan_increment = 4;
1200                 break;
1201         }
1202
1203         /* find channel */
1204         while (country_ie_len >= 3) {
1205                 u8 first_channel = triplet->chans.first_channel;
1206
1207                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1208                         goto next;
1209
1210                 for (i = 0; i < triplet->chans.num_channels; i++) {
1211                         if (first_channel + i * chan_increment == chan) {
1212                                 have_chan_pwr = true;
1213                                 chan_pwr = triplet->chans.max_power;
1214                                 break;
1215                         }
1216                 }
1217                 if (have_chan_pwr)
1218                         break;
1219
1220  next:
1221                 triplet++;
1222                 country_ie_len -= 3;
1223         }
1224
1225         if (!have_chan_pwr)
1226                 return 0;
1227
1228         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1229
1230         if (sdata->ap_power_level == new_ap_level)
1231                 return 0;
1232
1233         sdata_info(sdata,
1234                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1235                    new_ap_level, chan_pwr, *pwr_constr_elem,
1236                    sdata->u.mgd.bssid);
1237         sdata->ap_power_level = new_ap_level;
1238         if (__ieee80211_recalc_txpower(sdata))
1239                 return BSS_CHANGED_TXPOWER;
1240         return 0;
1241 }
1242
1243 /* powersave */
1244 static void ieee80211_enable_ps(struct ieee80211_local *local,
1245                                 struct ieee80211_sub_if_data *sdata)
1246 {
1247         struct ieee80211_conf *conf = &local->hw.conf;
1248
1249         /*
1250          * If we are scanning right now then the parameters will
1251          * take effect when scan finishes.
1252          */
1253         if (local->scanning)
1254                 return;
1255
1256         if (conf->dynamic_ps_timeout > 0 &&
1257             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1258                 mod_timer(&local->dynamic_ps_timer, jiffies +
1259                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1260         } else {
1261                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1262                         ieee80211_send_nullfunc(local, sdata, 1);
1263
1264                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1265                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1266                         return;
1267
1268                 conf->flags |= IEEE80211_CONF_PS;
1269                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1270         }
1271 }
1272
1273 static void ieee80211_change_ps(struct ieee80211_local *local)
1274 {
1275         struct ieee80211_conf *conf = &local->hw.conf;
1276
1277         if (local->ps_sdata) {
1278                 ieee80211_enable_ps(local, local->ps_sdata);
1279         } else if (conf->flags & IEEE80211_CONF_PS) {
1280                 conf->flags &= ~IEEE80211_CONF_PS;
1281                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1282                 del_timer_sync(&local->dynamic_ps_timer);
1283                 cancel_work_sync(&local->dynamic_ps_enable_work);
1284         }
1285 }
1286
1287 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1288 {
1289         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1290         struct sta_info *sta = NULL;
1291         bool authorized = false;
1292
1293         if (!mgd->powersave)
1294                 return false;
1295
1296         if (mgd->broken_ap)
1297                 return false;
1298
1299         if (!mgd->associated)
1300                 return false;
1301
1302         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1303                 return false;
1304
1305         if (!mgd->have_beacon)
1306                 return false;
1307
1308         rcu_read_lock();
1309         sta = sta_info_get(sdata, mgd->bssid);
1310         if (sta)
1311                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1312         rcu_read_unlock();
1313
1314         return authorized;
1315 }
1316
1317 /* need to hold RTNL or interface lock */
1318 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1319 {
1320         struct ieee80211_sub_if_data *sdata, *found = NULL;
1321         int count = 0;
1322         int timeout;
1323
1324         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1325                 local->ps_sdata = NULL;
1326                 return;
1327         }
1328
1329         list_for_each_entry(sdata, &local->interfaces, list) {
1330                 if (!ieee80211_sdata_running(sdata))
1331                         continue;
1332                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1333                         /* If an AP vif is found, then disable PS
1334                          * by setting the count to zero thereby setting
1335                          * ps_sdata to NULL.
1336                          */
1337                         count = 0;
1338                         break;
1339                 }
1340                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1341                         continue;
1342                 found = sdata;
1343                 count++;
1344         }
1345
1346         if (count == 1 && ieee80211_powersave_allowed(found)) {
1347                 s32 beaconint_us;
1348
1349                 if (latency < 0)
1350                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1351
1352                 beaconint_us = ieee80211_tu_to_usec(
1353                                         found->vif.bss_conf.beacon_int);
1354
1355                 timeout = local->dynamic_ps_forced_timeout;
1356                 if (timeout < 0) {
1357                         /*
1358                          * Go to full PSM if the user configures a very low
1359                          * latency requirement.
1360                          * The 2000 second value is there for compatibility
1361                          * until the PM_QOS_NETWORK_LATENCY is configured
1362                          * with real values.
1363                          */
1364                         if (latency > (1900 * USEC_PER_MSEC) &&
1365                             latency != (2000 * USEC_PER_SEC))
1366                                 timeout = 0;
1367                         else
1368                                 timeout = 100;
1369                 }
1370                 local->hw.conf.dynamic_ps_timeout = timeout;
1371
1372                 if (beaconint_us > latency) {
1373                         local->ps_sdata = NULL;
1374                 } else {
1375                         int maxslp = 1;
1376                         u8 dtimper = found->u.mgd.dtim_period;
1377
1378                         /* If the TIM IE is invalid, pretend the value is 1 */
1379                         if (!dtimper)
1380                                 dtimper = 1;
1381                         else if (dtimper > 1)
1382                                 maxslp = min_t(int, dtimper,
1383                                                     latency / beaconint_us);
1384
1385                         local->hw.conf.max_sleep_period = maxslp;
1386                         local->hw.conf.ps_dtim_period = dtimper;
1387                         local->ps_sdata = found;
1388                 }
1389         } else {
1390                 local->ps_sdata = NULL;
1391         }
1392
1393         ieee80211_change_ps(local);
1394 }
1395
1396 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1397 {
1398         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1399
1400         if (sdata->vif.bss_conf.ps != ps_allowed) {
1401                 sdata->vif.bss_conf.ps = ps_allowed;
1402                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1403         }
1404 }
1405
1406 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1407 {
1408         struct ieee80211_local *local =
1409                 container_of(work, struct ieee80211_local,
1410                              dynamic_ps_disable_work);
1411
1412         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1413                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1414                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1415         }
1416
1417         ieee80211_wake_queues_by_reason(&local->hw,
1418                                         IEEE80211_MAX_QUEUE_MAP,
1419                                         IEEE80211_QUEUE_STOP_REASON_PS,
1420                                         false);
1421 }
1422
1423 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1424 {
1425         struct ieee80211_local *local =
1426                 container_of(work, struct ieee80211_local,
1427                              dynamic_ps_enable_work);
1428         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1429         struct ieee80211_if_managed *ifmgd;
1430         unsigned long flags;
1431         int q;
1432
1433         /* can only happen when PS was just disabled anyway */
1434         if (!sdata)
1435                 return;
1436
1437         ifmgd = &sdata->u.mgd;
1438
1439         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1440                 return;
1441
1442         if (local->hw.conf.dynamic_ps_timeout > 0) {
1443                 /* don't enter PS if TX frames are pending */
1444                 if (drv_tx_frames_pending(local)) {
1445                         mod_timer(&local->dynamic_ps_timer, jiffies +
1446                                   msecs_to_jiffies(
1447                                   local->hw.conf.dynamic_ps_timeout));
1448                         return;
1449                 }
1450
1451                 /*
1452                  * transmission can be stopped by others which leads to
1453                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1454                  * is not the actual idle state.
1455                  */
1456                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1457                 for (q = 0; q < local->hw.queues; q++) {
1458                         if (local->queue_stop_reasons[q]) {
1459                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1460                                                        flags);
1461                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1462                                           msecs_to_jiffies(
1463                                           local->hw.conf.dynamic_ps_timeout));
1464                                 return;
1465                         }
1466                 }
1467                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1468         }
1469
1470         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1471             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1472                 if (drv_tx_frames_pending(local)) {
1473                         mod_timer(&local->dynamic_ps_timer, jiffies +
1474                                   msecs_to_jiffies(
1475                                   local->hw.conf.dynamic_ps_timeout));
1476                 } else {
1477                         ieee80211_send_nullfunc(local, sdata, 1);
1478                         /* Flush to get the tx status of nullfunc frame */
1479                         ieee80211_flush_queues(local, sdata);
1480                 }
1481         }
1482
1483         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1484               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1485             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1486                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1487                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1488                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1489         }
1490 }
1491
1492 void ieee80211_dynamic_ps_timer(unsigned long data)
1493 {
1494         struct ieee80211_local *local = (void *) data;
1495
1496         if (local->quiescing || local->suspended)
1497                 return;
1498
1499         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1500 }
1501
1502 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1503 {
1504         struct delayed_work *delayed_work =
1505                 container_of(work, struct delayed_work, work);
1506         struct ieee80211_sub_if_data *sdata =
1507                 container_of(delayed_work, struct ieee80211_sub_if_data,
1508                              dfs_cac_timer_work);
1509         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1510
1511         mutex_lock(&sdata->local->mtx);
1512         if (sdata->wdev.cac_started) {
1513                 ieee80211_vif_release_channel(sdata);
1514                 cfg80211_cac_event(sdata->dev, &chandef,
1515                                    NL80211_RADAR_CAC_FINISHED,
1516                                    GFP_KERNEL);
1517         }
1518         mutex_unlock(&sdata->local->mtx);
1519 }
1520
1521 /* MLME */
1522 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1523                                      struct ieee80211_sub_if_data *sdata,
1524                                      const u8 *wmm_param, size_t wmm_param_len)
1525 {
1526         struct ieee80211_tx_queue_params params;
1527         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1528         size_t left;
1529         int count;
1530         const u8 *pos;
1531         u8 uapsd_queues = 0;
1532
1533         if (!local->ops->conf_tx)
1534                 return false;
1535
1536         if (local->hw.queues < IEEE80211_NUM_ACS)
1537                 return false;
1538
1539         if (!wmm_param)
1540                 return false;
1541
1542         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1543                 return false;
1544
1545         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1546                 uapsd_queues = ifmgd->uapsd_queues;
1547
1548         count = wmm_param[6] & 0x0f;
1549         if (count == ifmgd->wmm_last_param_set)
1550                 return false;
1551         ifmgd->wmm_last_param_set = count;
1552
1553         pos = wmm_param + 8;
1554         left = wmm_param_len - 8;
1555
1556         memset(&params, 0, sizeof(params));
1557
1558         sdata->wmm_acm = 0;
1559         for (; left >= 4; left -= 4, pos += 4) {
1560                 int aci = (pos[0] >> 5) & 0x03;
1561                 int acm = (pos[0] >> 4) & 0x01;
1562                 bool uapsd = false;
1563                 int queue;
1564
1565                 switch (aci) {
1566                 case 1: /* AC_BK */
1567                         queue = 3;
1568                         if (acm)
1569                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1570                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1571                                 uapsd = true;
1572                         break;
1573                 case 2: /* AC_VI */
1574                         queue = 1;
1575                         if (acm)
1576                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1577                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1578                                 uapsd = true;
1579                         break;
1580                 case 3: /* AC_VO */
1581                         queue = 0;
1582                         if (acm)
1583                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1584                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1585                                 uapsd = true;
1586                         break;
1587                 case 0: /* AC_BE */
1588                 default:
1589                         queue = 2;
1590                         if (acm)
1591                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1592                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1593                                 uapsd = true;
1594                         break;
1595                 }
1596
1597                 params.aifs = pos[0] & 0x0f;
1598                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1599                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1600                 params.txop = get_unaligned_le16(pos + 2);
1601                 params.acm = acm;
1602                 params.uapsd = uapsd;
1603
1604                 mlme_dbg(sdata,
1605                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1606                          queue, aci, acm,
1607                          params.aifs, params.cw_min, params.cw_max,
1608                          params.txop, params.uapsd);
1609                 sdata->tx_conf[queue] = params;
1610                 if (drv_conf_tx(local, sdata, queue, &params))
1611                         sdata_err(sdata,
1612                                   "failed to set TX queue parameters for queue %d\n",
1613                                   queue);
1614         }
1615
1616         /* enable WMM or activate new settings */
1617         sdata->vif.bss_conf.qos = true;
1618         return true;
1619 }
1620
1621 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1622 {
1623         lockdep_assert_held(&sdata->local->mtx);
1624
1625         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1626         ieee80211_run_deferred_scan(sdata->local);
1627 }
1628
1629 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1630 {
1631         mutex_lock(&sdata->local->mtx);
1632         __ieee80211_stop_poll(sdata);
1633         mutex_unlock(&sdata->local->mtx);
1634 }
1635
1636 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1637                                            u16 capab, bool erp_valid, u8 erp)
1638 {
1639         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1640         u32 changed = 0;
1641         bool use_protection;
1642         bool use_short_preamble;
1643         bool use_short_slot;
1644
1645         if (erp_valid) {
1646                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1647                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1648         } else {
1649                 use_protection = false;
1650                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1651         }
1652
1653         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1654         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1655                 use_short_slot = true;
1656
1657         if (use_protection != bss_conf->use_cts_prot) {
1658                 bss_conf->use_cts_prot = use_protection;
1659                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1660         }
1661
1662         if (use_short_preamble != bss_conf->use_short_preamble) {
1663                 bss_conf->use_short_preamble = use_short_preamble;
1664                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1665         }
1666
1667         if (use_short_slot != bss_conf->use_short_slot) {
1668                 bss_conf->use_short_slot = use_short_slot;
1669                 changed |= BSS_CHANGED_ERP_SLOT;
1670         }
1671
1672         return changed;
1673 }
1674
1675 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1676                                      struct cfg80211_bss *cbss,
1677                                      u32 bss_info_changed)
1678 {
1679         struct ieee80211_bss *bss = (void *)cbss->priv;
1680         struct ieee80211_local *local = sdata->local;
1681         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1682
1683         bss_info_changed |= BSS_CHANGED_ASSOC;
1684         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1685                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1686
1687         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1688                 beacon_loss_count * bss_conf->beacon_int));
1689
1690         sdata->u.mgd.associated = cbss;
1691         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1692
1693         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1694
1695         if (sdata->vif.p2p) {
1696                 const struct cfg80211_bss_ies *ies;
1697
1698                 rcu_read_lock();
1699                 ies = rcu_dereference(cbss->ies);
1700                 if (ies) {
1701                         int ret;
1702
1703                         ret = cfg80211_get_p2p_attr(
1704                                         ies->data, ies->len,
1705                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1706                                         (u8 *) &bss_conf->p2p_noa_attr,
1707                                         sizeof(bss_conf->p2p_noa_attr));
1708                         if (ret >= 2) {
1709                                 sdata->u.mgd.p2p_noa_index =
1710                                         bss_conf->p2p_noa_attr.index;
1711                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1712                         }
1713                 }
1714                 rcu_read_unlock();
1715         }
1716
1717         /* just to be sure */
1718         ieee80211_stop_poll(sdata);
1719
1720         ieee80211_led_assoc(local, 1);
1721
1722         if (sdata->u.mgd.have_beacon) {
1723                 /*
1724                  * If the AP is buggy we may get here with no DTIM period
1725                  * known, so assume it's 1 which is the only safe assumption
1726                  * in that case, although if the TIM IE is broken powersave
1727                  * probably just won't work at all.
1728                  */
1729                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1730                 bss_conf->beacon_rate = bss->beacon_rate;
1731                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1732         } else {
1733                 bss_conf->beacon_rate = NULL;
1734                 bss_conf->dtim_period = 0;
1735         }
1736
1737         bss_conf->assoc = 1;
1738
1739         /* Tell the driver to monitor connection quality (if supported) */
1740         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1741             bss_conf->cqm_rssi_thold)
1742                 bss_info_changed |= BSS_CHANGED_CQM;
1743
1744         /* Enable ARP filtering */
1745         if (bss_conf->arp_addr_cnt)
1746                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1747
1748         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1749
1750         mutex_lock(&local->iflist_mtx);
1751         ieee80211_recalc_ps(local, -1);
1752         mutex_unlock(&local->iflist_mtx);
1753
1754         ieee80211_recalc_smps(sdata);
1755         ieee80211_recalc_ps_vif(sdata);
1756
1757         netif_carrier_on(sdata->dev);
1758 }
1759
1760 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1761                                    u16 stype, u16 reason, bool tx,
1762                                    u8 *frame_buf)
1763 {
1764         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1765         struct ieee80211_local *local = sdata->local;
1766         u32 changed = 0;
1767
1768         sdata_assert_lock(sdata);
1769
1770         if (WARN_ON_ONCE(tx && !frame_buf))
1771                 return;
1772
1773         if (WARN_ON(!ifmgd->associated))
1774                 return;
1775
1776         ieee80211_stop_poll(sdata);
1777
1778         ifmgd->associated = NULL;
1779         netif_carrier_off(sdata->dev);
1780
1781         /*
1782          * if we want to get out of ps before disassoc (why?) we have
1783          * to do it before sending disassoc, as otherwise the null-packet
1784          * won't be valid.
1785          */
1786         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1787                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1788                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1789         }
1790         local->ps_sdata = NULL;
1791
1792         /* disable per-vif ps */
1793         ieee80211_recalc_ps_vif(sdata);
1794
1795         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1796         if (tx)
1797                 ieee80211_flush_queues(local, sdata);
1798
1799         /* deauthenticate/disassociate now */
1800         if (tx || frame_buf)
1801                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1802                                                reason, tx, frame_buf);
1803
1804         /* flush out frame */
1805         if (tx)
1806                 ieee80211_flush_queues(local, sdata);
1807
1808         /* clear bssid only after building the needed mgmt frames */
1809         memset(ifmgd->bssid, 0, ETH_ALEN);
1810
1811         /* remove AP and TDLS peers */
1812         sta_info_flush(sdata);
1813
1814         /* finally reset all BSS / config parameters */
1815         changed |= ieee80211_reset_erp_info(sdata);
1816
1817         ieee80211_led_assoc(local, 0);
1818         changed |= BSS_CHANGED_ASSOC;
1819         sdata->vif.bss_conf.assoc = false;
1820
1821         ifmgd->p2p_noa_index = -1;
1822         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1823                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1824
1825         /* on the next assoc, re-program HT/VHT parameters */
1826         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1827         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1828         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1829         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1830
1831         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1832
1833         del_timer_sync(&local->dynamic_ps_timer);
1834         cancel_work_sync(&local->dynamic_ps_enable_work);
1835
1836         /* Disable ARP filtering */
1837         if (sdata->vif.bss_conf.arp_addr_cnt)
1838                 changed |= BSS_CHANGED_ARP_FILTER;
1839
1840         sdata->vif.bss_conf.qos = false;
1841         changed |= BSS_CHANGED_QOS;
1842
1843         /* The BSSID (not really interesting) and HT changed */
1844         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1845         ieee80211_bss_info_change_notify(sdata, changed);
1846
1847         /* disassociated - set to defaults now */
1848         ieee80211_set_wmm_default(sdata, false);
1849
1850         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1851         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1852         del_timer_sync(&sdata->u.mgd.timer);
1853         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1854
1855         sdata->vif.bss_conf.dtim_period = 0;
1856         sdata->vif.bss_conf.beacon_rate = NULL;
1857
1858         ifmgd->have_beacon = false;
1859
1860         ifmgd->flags = 0;
1861         mutex_lock(&local->mtx);
1862         ieee80211_vif_release_channel(sdata);
1863
1864         sdata->vif.csa_active = false;
1865         if (sdata->csa_block_tx) {
1866                 ieee80211_wake_vif_queues(local, sdata,
1867                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1868                 sdata->csa_block_tx = false;
1869         }
1870         mutex_unlock(&local->mtx);
1871
1872         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1873 }
1874
1875 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1876                              struct ieee80211_hdr *hdr)
1877 {
1878         /*
1879          * We can postpone the mgd.timer whenever receiving unicast frames
1880          * from AP because we know that the connection is working both ways
1881          * at that time. But multicast frames (and hence also beacons) must
1882          * be ignored here, because we need to trigger the timer during
1883          * data idle periods for sending the periodic probe request to the
1884          * AP we're connected to.
1885          */
1886         if (is_multicast_ether_addr(hdr->addr1))
1887                 return;
1888
1889         ieee80211_sta_reset_conn_monitor(sdata);
1890 }
1891
1892 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1893 {
1894         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1895         struct ieee80211_local *local = sdata->local;
1896
1897         mutex_lock(&local->mtx);
1898         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1899                 goto out;
1900
1901         __ieee80211_stop_poll(sdata);
1902
1903         mutex_lock(&local->iflist_mtx);
1904         ieee80211_recalc_ps(local, -1);
1905         mutex_unlock(&local->iflist_mtx);
1906
1907         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1908                 goto out;
1909
1910         /*
1911          * We've received a probe response, but are not sure whether
1912          * we have or will be receiving any beacons or data, so let's
1913          * schedule the timers again, just in case.
1914          */
1915         ieee80211_sta_reset_beacon_monitor(sdata);
1916
1917         mod_timer(&ifmgd->conn_mon_timer,
1918                   round_jiffies_up(jiffies +
1919                                    IEEE80211_CONNECTION_IDLE_TIME));
1920 out:
1921         mutex_unlock(&local->mtx);
1922 }
1923
1924 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1925                              struct ieee80211_hdr *hdr, bool ack)
1926 {
1927         if (!ieee80211_is_data(hdr->frame_control))
1928             return;
1929
1930         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1931             sdata->u.mgd.probe_send_count > 0) {
1932                 if (ack)
1933                         ieee80211_sta_reset_conn_monitor(sdata);
1934                 else
1935                         sdata->u.mgd.nullfunc_failed = true;
1936                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1937                 return;
1938         }
1939
1940         if (ack)
1941                 ieee80211_sta_reset_conn_monitor(sdata);
1942 }
1943
1944 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1945 {
1946         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1947         const u8 *ssid;
1948         u8 *dst = ifmgd->associated->bssid;
1949         u8 unicast_limit = max(1, max_probe_tries - 3);
1950
1951         /*
1952          * Try sending broadcast probe requests for the last three
1953          * probe requests after the first ones failed since some
1954          * buggy APs only support broadcast probe requests.
1955          */
1956         if (ifmgd->probe_send_count >= unicast_limit)
1957                 dst = NULL;
1958
1959         /*
1960          * When the hardware reports an accurate Tx ACK status, it's
1961          * better to send a nullfunc frame instead of a probe request,
1962          * as it will kick us off the AP quickly if we aren't associated
1963          * anymore. The timeout will be reset if the frame is ACKed by
1964          * the AP.
1965          */
1966         ifmgd->probe_send_count++;
1967
1968         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1969                 ifmgd->nullfunc_failed = false;
1970                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1971         } else {
1972                 int ssid_len;
1973
1974                 rcu_read_lock();
1975                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1976                 if (WARN_ON_ONCE(ssid == NULL))
1977                         ssid_len = 0;
1978                 else
1979                         ssid_len = ssid[1];
1980
1981                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1982                                          0, (u32) -1, true, 0,
1983                                          ifmgd->associated->channel, false);
1984                 rcu_read_unlock();
1985         }
1986
1987         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1988         run_again(sdata, ifmgd->probe_timeout);
1989         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1990                 ieee80211_flush_queues(sdata->local, sdata);
1991 }
1992
1993 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1994                                    bool beacon)
1995 {
1996         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1997         bool already = false;
1998
1999         if (!ieee80211_sdata_running(sdata))
2000                 return;
2001
2002         sdata_lock(sdata);
2003
2004         if (!ifmgd->associated)
2005                 goto out;
2006
2007         mutex_lock(&sdata->local->mtx);
2008
2009         if (sdata->local->tmp_channel || sdata->local->scanning) {
2010                 mutex_unlock(&sdata->local->mtx);
2011                 goto out;
2012         }
2013
2014         if (beacon) {
2015                 mlme_dbg_ratelimited(sdata,
2016                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2017                                      beacon_loss_count);
2018
2019                 ieee80211_cqm_rssi_notify(&sdata->vif,
2020                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
2021                                           GFP_KERNEL);
2022         }
2023
2024         /*
2025          * The driver/our work has already reported this event or the
2026          * connection monitoring has kicked in and we have already sent
2027          * a probe request. Or maybe the AP died and the driver keeps
2028          * reporting until we disassociate...
2029          *
2030          * In either case we have to ignore the current call to this
2031          * function (except for setting the correct probe reason bit)
2032          * because otherwise we would reset the timer every time and
2033          * never check whether we received a probe response!
2034          */
2035         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2036                 already = true;
2037
2038         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2039
2040         mutex_unlock(&sdata->local->mtx);
2041
2042         if (already)
2043                 goto out;
2044
2045         mutex_lock(&sdata->local->iflist_mtx);
2046         ieee80211_recalc_ps(sdata->local, -1);
2047         mutex_unlock(&sdata->local->iflist_mtx);
2048
2049         ifmgd->probe_send_count = 0;
2050         ieee80211_mgd_probe_ap_send(sdata);
2051  out:
2052         sdata_unlock(sdata);
2053 }
2054
2055 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2056                                           struct ieee80211_vif *vif)
2057 {
2058         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2059         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2060         struct cfg80211_bss *cbss;
2061         struct sk_buff *skb;
2062         const u8 *ssid;
2063         int ssid_len;
2064
2065         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2066                 return NULL;
2067
2068         sdata_assert_lock(sdata);
2069
2070         if (ifmgd->associated)
2071                 cbss = ifmgd->associated;
2072         else if (ifmgd->auth_data)
2073                 cbss = ifmgd->auth_data->bss;
2074         else if (ifmgd->assoc_data)
2075                 cbss = ifmgd->assoc_data->bss;
2076         else
2077                 return NULL;
2078
2079         rcu_read_lock();
2080         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2081         if (WARN_ON_ONCE(ssid == NULL))
2082                 ssid_len = 0;
2083         else
2084                 ssid_len = ssid[1];
2085
2086         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2087                                         (u32) -1, cbss->channel,
2088                                         ssid + 2, ssid_len,
2089                                         NULL, 0, true);
2090         rcu_read_unlock();
2091
2092         return skb;
2093 }
2094 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2095
2096 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2097 {
2098         struct ieee80211_local *local = sdata->local;
2099         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2100         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2101
2102         sdata_lock(sdata);
2103         if (!ifmgd->associated) {
2104                 sdata_unlock(sdata);
2105                 return;
2106         }
2107
2108         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2109                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2110                                true, frame_buf);
2111         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2112
2113         mutex_lock(&local->mtx);
2114         sdata->vif.csa_active = false;
2115         if (sdata->csa_block_tx) {
2116                 ieee80211_wake_vif_queues(local, sdata,
2117                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2118                 sdata->csa_block_tx = false;
2119         }
2120         mutex_unlock(&local->mtx);
2121
2122         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2123                               IEEE80211_DEAUTH_FRAME_LEN);
2124         sdata_unlock(sdata);
2125 }
2126
2127 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2128 {
2129         struct ieee80211_sub_if_data *sdata =
2130                 container_of(work, struct ieee80211_sub_if_data,
2131                              u.mgd.beacon_connection_loss_work);
2132         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2133         struct sta_info *sta;
2134
2135         if (ifmgd->associated) {
2136                 rcu_read_lock();
2137                 sta = sta_info_get(sdata, ifmgd->bssid);
2138                 if (sta)
2139                         sta->beacon_loss_count++;
2140                 rcu_read_unlock();
2141         }
2142
2143         if (ifmgd->connection_loss) {
2144                 sdata_info(sdata, "Connection to AP %pM lost\n",
2145                            ifmgd->bssid);
2146                 __ieee80211_disconnect(sdata);
2147         } else {
2148                 ieee80211_mgd_probe_ap(sdata, true);
2149         }
2150 }
2151
2152 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2153 {
2154         struct ieee80211_sub_if_data *sdata =
2155                 container_of(work, struct ieee80211_sub_if_data,
2156                              u.mgd.csa_connection_drop_work);
2157
2158         __ieee80211_disconnect(sdata);
2159 }
2160
2161 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2162 {
2163         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2164         struct ieee80211_hw *hw = &sdata->local->hw;
2165
2166         trace_api_beacon_loss(sdata);
2167
2168         sdata->u.mgd.connection_loss = false;
2169         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2170 }
2171 EXPORT_SYMBOL(ieee80211_beacon_loss);
2172
2173 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2174 {
2175         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2176         struct ieee80211_hw *hw = &sdata->local->hw;
2177
2178         trace_api_connection_loss(sdata);
2179
2180         sdata->u.mgd.connection_loss = true;
2181         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2182 }
2183 EXPORT_SYMBOL(ieee80211_connection_loss);
2184
2185
2186 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2187                                         bool assoc)
2188 {
2189         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2190
2191         sdata_assert_lock(sdata);
2192
2193         if (!assoc) {
2194                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2195
2196                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2197                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2198                 sdata->u.mgd.flags = 0;
2199                 mutex_lock(&sdata->local->mtx);
2200                 ieee80211_vif_release_channel(sdata);
2201                 mutex_unlock(&sdata->local->mtx);
2202         }
2203
2204         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2205         kfree(auth_data);
2206         sdata->u.mgd.auth_data = NULL;
2207 }
2208
2209 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2210                                      struct ieee80211_mgmt *mgmt, size_t len)
2211 {
2212         struct ieee80211_local *local = sdata->local;
2213         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2214         u8 *pos;
2215         struct ieee802_11_elems elems;
2216         u32 tx_flags = 0;
2217
2218         pos = mgmt->u.auth.variable;
2219         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2220         if (!elems.challenge)
2221                 return;
2222         auth_data->expected_transaction = 4;
2223         drv_mgd_prepare_tx(sdata->local, sdata);
2224         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2225                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2226                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2227         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2228                             elems.challenge - 2, elems.challenge_len + 2,
2229                             auth_data->bss->bssid, auth_data->bss->bssid,
2230                             auth_data->key, auth_data->key_len,
2231                             auth_data->key_idx, tx_flags);
2232 }
2233
2234 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2235                                    struct ieee80211_mgmt *mgmt, size_t len)
2236 {
2237         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2238         u8 bssid[ETH_ALEN];
2239         u16 auth_alg, auth_transaction, status_code;
2240         struct sta_info *sta;
2241
2242         sdata_assert_lock(sdata);
2243
2244         if (len < 24 + 6)
2245                 return;
2246
2247         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2248                 return;
2249
2250         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2251
2252         if (!ether_addr_equal(bssid, mgmt->bssid))
2253                 return;
2254
2255         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2256         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2257         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2258
2259         if (auth_alg != ifmgd->auth_data->algorithm ||
2260             auth_transaction != ifmgd->auth_data->expected_transaction) {
2261                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2262                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2263                            auth_transaction,
2264                            ifmgd->auth_data->expected_transaction);
2265                 return;
2266         }
2267
2268         if (status_code != WLAN_STATUS_SUCCESS) {
2269                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2270                            mgmt->sa, status_code);
2271                 ieee80211_destroy_auth_data(sdata, false);
2272                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2273                 return;
2274         }
2275
2276         switch (ifmgd->auth_data->algorithm) {
2277         case WLAN_AUTH_OPEN:
2278         case WLAN_AUTH_LEAP:
2279         case WLAN_AUTH_FT:
2280         case WLAN_AUTH_SAE:
2281                 break;
2282         case WLAN_AUTH_SHARED_KEY:
2283                 if (ifmgd->auth_data->expected_transaction != 4) {
2284                         ieee80211_auth_challenge(sdata, mgmt, len);
2285                         /* need another frame */
2286                         return;
2287                 }
2288                 break;
2289         default:
2290                 WARN_ONCE(1, "invalid auth alg %d",
2291                           ifmgd->auth_data->algorithm);
2292                 return;
2293         }
2294
2295         sdata_info(sdata, "authenticated\n");
2296         ifmgd->auth_data->done = true;
2297         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2298         ifmgd->auth_data->timeout_started = true;
2299         run_again(sdata, ifmgd->auth_data->timeout);
2300
2301         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2302             ifmgd->auth_data->expected_transaction != 2) {
2303                 /*
2304                  * Report auth frame to user space for processing since another
2305                  * round of Authentication frames is still needed.
2306                  */
2307                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2308                 return;
2309         }
2310
2311         /* move station state to auth */
2312         mutex_lock(&sdata->local->sta_mtx);
2313         sta = sta_info_get(sdata, bssid);
2314         if (!sta) {
2315                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2316                 goto out_err;
2317         }
2318         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2319                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2320                 goto out_err;
2321         }
2322         mutex_unlock(&sdata->local->sta_mtx);
2323
2324         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2325         return;
2326  out_err:
2327         mutex_unlock(&sdata->local->sta_mtx);
2328         /* ignore frame -- wait for timeout */
2329 }
2330
2331 #define case_WLAN(type) \
2332         case WLAN_REASON_##type: return #type
2333
2334 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2335 {
2336         switch (reason_code) {
2337         case_WLAN(UNSPECIFIED);
2338         case_WLAN(PREV_AUTH_NOT_VALID);
2339         case_WLAN(DEAUTH_LEAVING);
2340         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2341         case_WLAN(DISASSOC_AP_BUSY);
2342         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2343         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2344         case_WLAN(DISASSOC_STA_HAS_LEFT);
2345         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2346         case_WLAN(DISASSOC_BAD_POWER);
2347         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2348         case_WLAN(INVALID_IE);
2349         case_WLAN(MIC_FAILURE);
2350         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2351         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2352         case_WLAN(IE_DIFFERENT);
2353         case_WLAN(INVALID_GROUP_CIPHER);
2354         case_WLAN(INVALID_PAIRWISE_CIPHER);
2355         case_WLAN(INVALID_AKMP);
2356         case_WLAN(UNSUPP_RSN_VERSION);
2357         case_WLAN(INVALID_RSN_IE_CAP);
2358         case_WLAN(IEEE8021X_FAILED);
2359         case_WLAN(CIPHER_SUITE_REJECTED);
2360         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2361         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2362         case_WLAN(DISASSOC_LOW_ACK);
2363         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2364         case_WLAN(QSTA_LEAVE_QBSS);
2365         case_WLAN(QSTA_NOT_USE);
2366         case_WLAN(QSTA_REQUIRE_SETUP);
2367         case_WLAN(QSTA_TIMEOUT);
2368         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2369         case_WLAN(MESH_PEER_CANCELED);
2370         case_WLAN(MESH_MAX_PEERS);
2371         case_WLAN(MESH_CONFIG);
2372         case_WLAN(MESH_CLOSE);
2373         case_WLAN(MESH_MAX_RETRIES);
2374         case_WLAN(MESH_CONFIRM_TIMEOUT);
2375         case_WLAN(MESH_INVALID_GTK);
2376         case_WLAN(MESH_INCONSISTENT_PARAM);
2377         case_WLAN(MESH_INVALID_SECURITY);
2378         case_WLAN(MESH_PATH_ERROR);
2379         case_WLAN(MESH_PATH_NOFORWARD);
2380         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2381         case_WLAN(MAC_EXISTS_IN_MBSS);
2382         case_WLAN(MESH_CHAN_REGULATORY);
2383         case_WLAN(MESH_CHAN);
2384         default: return "<unknown>";
2385         }
2386 }
2387
2388 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2389                                      struct ieee80211_mgmt *mgmt, size_t len)
2390 {
2391         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2392         const u8 *bssid = NULL;
2393         u16 reason_code;
2394
2395         sdata_assert_lock(sdata);
2396
2397         if (len < 24 + 2)
2398                 return;
2399
2400         if (!ifmgd->associated ||
2401             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2402                 return;
2403
2404         bssid = ifmgd->associated->bssid;
2405
2406         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2407
2408         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2409                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2410
2411         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2412
2413         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2414 }
2415
2416
2417 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2418                                        struct ieee80211_mgmt *mgmt, size_t len)
2419 {
2420         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2421         u16 reason_code;
2422
2423         sdata_assert_lock(sdata);
2424
2425         if (len < 24 + 2)
2426                 return;
2427
2428         if (!ifmgd->associated ||
2429             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2430                 return;
2431
2432         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2433
2434         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2435                    mgmt->sa, reason_code);
2436
2437         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2438
2439         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2440 }
2441
2442 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2443                                 u8 *supp_rates, unsigned int supp_rates_len,
2444                                 u32 *rates, u32 *basic_rates,
2445                                 bool *have_higher_than_11mbit,
2446                                 int *min_rate, int *min_rate_index,
2447                                 int shift, u32 rate_flags)
2448 {
2449         int i, j;
2450
2451         for (i = 0; i < supp_rates_len; i++) {
2452                 int rate = supp_rates[i] & 0x7f;
2453                 bool is_basic = !!(supp_rates[i] & 0x80);
2454
2455                 if ((rate * 5 * (1 << shift)) > 110)
2456                         *have_higher_than_11mbit = true;
2457
2458                 /*
2459                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2460                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2461                  *
2462                  * Note: Even through the membership selector and the basic
2463                  *       rate flag share the same bit, they are not exactly
2464                  *       the same.
2465                  */
2466                 if (!!(supp_rates[i] & 0x80) &&
2467                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2468                         continue;
2469
2470                 for (j = 0; j < sband->n_bitrates; j++) {
2471                         struct ieee80211_rate *br;
2472                         int brate;
2473
2474                         br = &sband->bitrates[j];
2475                         if ((rate_flags & br->flags) != rate_flags)
2476                                 continue;
2477
2478                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2479                         if (brate == rate) {
2480                                 *rates |= BIT(j);
2481                                 if (is_basic)
2482                                         *basic_rates |= BIT(j);
2483                                 if ((rate * 5) < *min_rate) {
2484                                         *min_rate = rate * 5;
2485                                         *min_rate_index = j;
2486                                 }
2487                                 break;
2488                         }
2489                 }
2490         }
2491 }
2492
2493 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2494                                          bool assoc)
2495 {
2496         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2497
2498         sdata_assert_lock(sdata);
2499
2500         if (!assoc) {
2501                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2502
2503                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
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         kfree(assoc_data);
2512         sdata->u.mgd.assoc_data = NULL;
2513 }
2514
2515 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2516                                     struct cfg80211_bss *cbss,
2517                                     struct ieee80211_mgmt *mgmt, size_t len)
2518 {
2519         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2520         struct ieee80211_local *local = sdata->local;
2521         struct ieee80211_supported_band *sband;
2522         struct sta_info *sta;
2523         u8 *pos;
2524         u16 capab_info, aid;
2525         struct ieee802_11_elems elems;
2526         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2527         const struct cfg80211_bss_ies *bss_ies = NULL;
2528         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2529         u32 changed = 0;
2530         int err;
2531         bool ret;
2532
2533         /* AssocResp and ReassocResp have identical structure */
2534
2535         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2536         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2537
2538         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2539                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2540                            aid);
2541         aid &= ~(BIT(15) | BIT(14));
2542
2543         ifmgd->broken_ap = false;
2544
2545         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2546                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2547                            aid);
2548                 aid = 0;
2549                 ifmgd->broken_ap = true;
2550         }
2551
2552         pos = mgmt->u.assoc_resp.variable;
2553         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2554
2555         if (!elems.supp_rates) {
2556                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2557                 return false;
2558         }
2559
2560         ifmgd->aid = aid;
2561
2562         /*
2563          * Some APs are erroneously not including some information in their
2564          * (re)association response frames. Try to recover by using the data
2565          * from the beacon or probe response. This seems to afflict mobile
2566          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2567          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2568          */
2569         if ((assoc_data->wmm && !elems.wmm_param) ||
2570             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2571              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2572             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2573              (!elems.vht_cap_elem || !elems.vht_operation))) {
2574                 const struct cfg80211_bss_ies *ies;
2575                 struct ieee802_11_elems bss_elems;
2576
2577                 rcu_read_lock();
2578                 ies = rcu_dereference(cbss->ies);
2579                 if (ies)
2580                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2581                                           GFP_ATOMIC);
2582                 rcu_read_unlock();
2583                 if (!bss_ies)
2584                         return false;
2585
2586                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2587                                        false, &bss_elems);
2588                 if (assoc_data->wmm &&
2589                     !elems.wmm_param && bss_elems.wmm_param) {
2590                         elems.wmm_param = bss_elems.wmm_param;
2591                         sdata_info(sdata,
2592                                    "AP bug: WMM param missing from AssocResp\n");
2593                 }
2594
2595                 /*
2596                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2597                  * have to include the IEs in the (re)association response.
2598                  */
2599                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2600                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2601                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2602                         sdata_info(sdata,
2603                                    "AP bug: HT capability missing from AssocResp\n");
2604                 }
2605                 if (!elems.ht_operation && bss_elems.ht_operation &&
2606                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2607                         elems.ht_operation = bss_elems.ht_operation;
2608                         sdata_info(sdata,
2609                                    "AP bug: HT operation missing from AssocResp\n");
2610                 }
2611                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2612                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2613                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2614                         sdata_info(sdata,
2615                                    "AP bug: VHT capa missing from AssocResp\n");
2616                 }
2617                 if (!elems.vht_operation && bss_elems.vht_operation &&
2618                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2619                         elems.vht_operation = bss_elems.vht_operation;
2620                         sdata_info(sdata,
2621                                    "AP bug: VHT operation missing from AssocResp\n");
2622                 }
2623         }
2624
2625         /*
2626          * We previously checked these in the beacon/probe response, so
2627          * they should be present here. This is just a safety net.
2628          */
2629         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2630             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2631                 sdata_info(sdata,
2632                            "HT AP is missing WMM params or HT capability/operation\n");
2633                 ret = false;
2634                 goto out;
2635         }
2636
2637         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2638             (!elems.vht_cap_elem || !elems.vht_operation)) {
2639                 sdata_info(sdata,
2640                            "VHT AP is missing VHT capability/operation\n");
2641                 ret = false;
2642                 goto out;
2643         }
2644
2645         mutex_lock(&sdata->local->sta_mtx);
2646         /*
2647          * station info was already allocated and inserted before
2648          * the association and should be available to us
2649          */
2650         sta = sta_info_get(sdata, cbss->bssid);
2651         if (WARN_ON(!sta)) {
2652                 mutex_unlock(&sdata->local->sta_mtx);
2653                 ret = false;
2654                 goto out;
2655         }
2656
2657         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2658
2659         /* Set up internal HT/VHT capabilities */
2660         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2661                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2662                                                   elems.ht_cap_elem, sta);
2663
2664         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2665                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2666                                                     elems.vht_cap_elem, sta);
2667
2668         /*
2669          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2670          * in their association response, so ignore that data for our own
2671          * configuration. If it changed since the last beacon, we'll get the
2672          * next beacon and update then.
2673          */
2674
2675         /*
2676          * If an operating mode notification IE is present, override the
2677          * NSS calculation (that would be done in rate_control_rate_init())
2678          * and use the # of streams from that element.
2679          */
2680         if (elems.opmode_notif &&
2681             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2682                 u8 nss;
2683
2684                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2685                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2686                 nss += 1;
2687                 sta->sta.rx_nss = nss;
2688         }
2689
2690         rate_control_rate_init(sta);
2691
2692         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2693                 set_sta_flag(sta, WLAN_STA_MFP);
2694
2695         if (elems.wmm_param)
2696                 set_sta_flag(sta, WLAN_STA_WME);
2697
2698         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2699         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2700                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2701         if (err) {
2702                 sdata_info(sdata,
2703                            "failed to move station %pM to desired state\n",
2704                            sta->sta.addr);
2705                 WARN_ON(__sta_info_destroy(sta));
2706                 mutex_unlock(&sdata->local->sta_mtx);
2707                 ret = false;
2708                 goto out;
2709         }
2710
2711         mutex_unlock(&sdata->local->sta_mtx);
2712
2713         /*
2714          * Always handle WMM once after association regardless
2715          * of the first value the AP uses. Setting -1 here has
2716          * that effect because the AP values is an unsigned
2717          * 4-bit value.
2718          */
2719         ifmgd->wmm_last_param_set = -1;
2720
2721         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2722                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2723                                          elems.wmm_param_len);
2724         else
2725                 ieee80211_set_wmm_default(sdata, false);
2726         changed |= BSS_CHANGED_QOS;
2727
2728         /* set AID and assoc capability,
2729          * ieee80211_set_associated() will tell the driver */
2730         bss_conf->aid = aid;
2731         bss_conf->assoc_capability = capab_info;
2732         ieee80211_set_associated(sdata, cbss, changed);
2733
2734         /*
2735          * If we're using 4-addr mode, let the AP know that we're
2736          * doing so, so that it can create the STA VLAN on its side
2737          */
2738         if (ifmgd->use_4addr)
2739                 ieee80211_send_4addr_nullfunc(local, sdata);
2740
2741         /*
2742          * Start timer to probe the connection to the AP now.
2743          * Also start the timer that will detect beacon loss.
2744          */
2745         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2746         ieee80211_sta_reset_beacon_monitor(sdata);
2747
2748         ret = true;
2749  out:
2750         kfree(bss_ies);
2751         return ret;
2752 }
2753
2754 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2755                                          struct ieee80211_mgmt *mgmt,
2756                                          size_t len)
2757 {
2758         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2759         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2760         u16 capab_info, status_code, aid;
2761         struct ieee802_11_elems elems;
2762         u8 *pos;
2763         bool reassoc;
2764         struct cfg80211_bss *bss;
2765
2766         sdata_assert_lock(sdata);
2767
2768         if (!assoc_data)
2769                 return;
2770         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2771                 return;
2772
2773         /*
2774          * AssocResp and ReassocResp have identical structure, so process both
2775          * of them in this function.
2776          */
2777
2778         if (len < 24 + 6)
2779                 return;
2780
2781         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2782         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2783         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2784         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2785
2786         sdata_info(sdata,
2787                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2788                    reassoc ? "Rea" : "A", mgmt->sa,
2789                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2790
2791         pos = mgmt->u.assoc_resp.variable;
2792         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2793
2794         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2795             elems.timeout_int &&
2796             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2797                 u32 tu, ms;
2798                 tu = le32_to_cpu(elems.timeout_int->value);
2799                 ms = tu * 1024 / 1000;
2800                 sdata_info(sdata,
2801                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2802                            mgmt->sa, tu, ms);
2803                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2804                 assoc_data->timeout_started = true;
2805                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2806                         run_again(sdata, assoc_data->timeout);
2807                 return;
2808         }
2809
2810         bss = assoc_data->bss;
2811
2812         if (status_code != WLAN_STATUS_SUCCESS) {
2813                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2814                            mgmt->sa, status_code);
2815                 ieee80211_destroy_assoc_data(sdata, false);
2816         } else {
2817                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2818                         /* oops -- internal error -- send timeout for now */
2819                         ieee80211_destroy_assoc_data(sdata, false);
2820                         cfg80211_assoc_timeout(sdata->dev, bss);
2821                         return;
2822                 }
2823                 sdata_info(sdata, "associated\n");
2824
2825                 /*
2826                  * destroy assoc_data afterwards, as otherwise an idle
2827                  * recalc after assoc_data is NULL but before associated
2828                  * is set can cause the interface to go idle
2829                  */
2830                 ieee80211_destroy_assoc_data(sdata, true);
2831         }
2832
2833         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
2834 }
2835
2836 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2837                                   struct ieee80211_mgmt *mgmt, size_t len,
2838                                   struct ieee80211_rx_status *rx_status,
2839                                   struct ieee802_11_elems *elems)
2840 {
2841         struct ieee80211_local *local = sdata->local;
2842         struct ieee80211_bss *bss;
2843         struct ieee80211_channel *channel;
2844
2845         sdata_assert_lock(sdata);
2846
2847         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
2848         if (!channel)
2849                 return;
2850
2851         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2852                                         channel);
2853         if (bss) {
2854                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2855                 ieee80211_rx_bss_put(local, bss);
2856         }
2857 }
2858
2859
2860 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2861                                          struct sk_buff *skb)
2862 {
2863         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2864         struct ieee80211_if_managed *ifmgd;
2865         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2866         size_t baselen, len = skb->len;
2867         struct ieee802_11_elems elems;
2868
2869         ifmgd = &sdata->u.mgd;
2870
2871         sdata_assert_lock(sdata);
2872
2873         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2874                 return; /* ignore ProbeResp to foreign address */
2875
2876         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2877         if (baselen > len)
2878                 return;
2879
2880         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2881                                false, &elems);
2882
2883         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2884
2885         if (ifmgd->associated &&
2886             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2887                 ieee80211_reset_ap_probe(sdata);
2888
2889         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2890             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2891                 /* got probe response, continue with auth */
2892                 sdata_info(sdata, "direct probe responded\n");
2893                 ifmgd->auth_data->tries = 0;
2894                 ifmgd->auth_data->timeout = jiffies;
2895                 ifmgd->auth_data->timeout_started = true;
2896                 run_again(sdata, ifmgd->auth_data->timeout);
2897         }
2898 }
2899
2900 /*
2901  * This is the canonical list of information elements we care about,
2902  * the filter code also gives us all changes to the Microsoft OUI
2903  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2904  *
2905  * We implement beacon filtering in software since that means we can
2906  * avoid processing the frame here and in cfg80211, and userspace
2907  * will not be able to tell whether the hardware supports it or not.
2908  *
2909  * XXX: This list needs to be dynamic -- userspace needs to be able to
2910  *      add items it requires. It also needs to be able to tell us to
2911  *      look out for other vendor IEs.
2912  */
2913 static const u64 care_about_ies =
2914         (1ULL << WLAN_EID_COUNTRY) |
2915         (1ULL << WLAN_EID_ERP_INFO) |
2916         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2917         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2918         (1ULL << WLAN_EID_HT_CAPABILITY) |
2919         (1ULL << WLAN_EID_HT_OPERATION);
2920
2921 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2922                                      struct ieee80211_mgmt *mgmt, size_t len,
2923                                      struct ieee80211_rx_status *rx_status)
2924 {
2925         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2926         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2927         size_t baselen;
2928         struct ieee802_11_elems elems;
2929         struct ieee80211_local *local = sdata->local;
2930         struct ieee80211_chanctx_conf *chanctx_conf;
2931         struct ieee80211_channel *chan;
2932         struct sta_info *sta;
2933         u32 changed = 0;
2934         bool erp_valid;
2935         u8 erp_value = 0;
2936         u32 ncrc;
2937         u8 *bssid;
2938         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2939
2940         sdata_assert_lock(sdata);
2941
2942         /* Process beacon from the current BSS */
2943         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2944         if (baselen > len)
2945                 return;
2946
2947         rcu_read_lock();
2948         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2949         if (!chanctx_conf) {
2950                 rcu_read_unlock();
2951                 return;
2952         }
2953
2954         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2955                 rcu_read_unlock();
2956                 return;
2957         }
2958         chan = chanctx_conf->def.chan;
2959         rcu_read_unlock();
2960
2961         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2962             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2963                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2964                                        len - baselen, false, &elems);
2965
2966                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2967                 if (elems.tim && !elems.parse_error) {
2968                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
2969                         ifmgd->dtim_period = tim_ie->dtim_period;
2970                 }
2971                 ifmgd->have_beacon = true;
2972                 ifmgd->assoc_data->need_beacon = false;
2973                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2974                         sdata->vif.bss_conf.sync_tsf =
2975                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2976                         sdata->vif.bss_conf.sync_device_ts =
2977                                 rx_status->device_timestamp;
2978                         if (elems.tim)
2979                                 sdata->vif.bss_conf.sync_dtim_count =
2980                                         elems.tim->dtim_count;
2981                         else
2982                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2983                 }
2984                 /* continue assoc process */
2985                 ifmgd->assoc_data->timeout = jiffies;
2986                 ifmgd->assoc_data->timeout_started = true;
2987                 run_again(sdata, ifmgd->assoc_data->timeout);
2988                 return;
2989         }
2990
2991         if (!ifmgd->associated ||
2992             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2993                 return;
2994         bssid = ifmgd->associated->bssid;
2995
2996         /* Track average RSSI from the Beacon frames of the current AP */
2997         ifmgd->last_beacon_signal = rx_status->signal;
2998         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2999                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3000                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3001                 ifmgd->last_cqm_event_signal = 0;
3002                 ifmgd->count_beacon_signal = 1;
3003                 ifmgd->last_ave_beacon_signal = 0;
3004         } else {
3005                 ifmgd->ave_beacon_signal =
3006                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3007                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3008                          ifmgd->ave_beacon_signal) / 16;
3009                 ifmgd->count_beacon_signal++;
3010         }
3011
3012         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3013             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3014                 int sig = ifmgd->ave_beacon_signal;
3015                 int last_sig = ifmgd->last_ave_beacon_signal;
3016
3017                 /*
3018                  * if signal crosses either of the boundaries, invoke callback
3019                  * with appropriate parameters
3020                  */
3021                 if (sig > ifmgd->rssi_max_thold &&
3022                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3023                         ifmgd->last_ave_beacon_signal = sig;
3024                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3025                 } else if (sig < ifmgd->rssi_min_thold &&
3026                            (last_sig >= ifmgd->rssi_max_thold ||
3027                            last_sig == 0)) {
3028                         ifmgd->last_ave_beacon_signal = sig;
3029                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3030                 }
3031         }
3032
3033         if (bss_conf->cqm_rssi_thold &&
3034             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3035             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3036                 int sig = ifmgd->ave_beacon_signal / 16;
3037                 int last_event = ifmgd->last_cqm_event_signal;
3038                 int thold = bss_conf->cqm_rssi_thold;
3039                 int hyst = bss_conf->cqm_rssi_hyst;
3040                 if (sig < thold &&
3041                     (last_event == 0 || sig < last_event - hyst)) {
3042                         ifmgd->last_cqm_event_signal = sig;
3043                         ieee80211_cqm_rssi_notify(
3044                                 &sdata->vif,
3045                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3046                                 GFP_KERNEL);
3047                 } else if (sig > thold &&
3048                            (last_event == 0 || sig > last_event + hyst)) {
3049                         ifmgd->last_cqm_event_signal = sig;
3050                         ieee80211_cqm_rssi_notify(
3051                                 &sdata->vif,
3052                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3053                                 GFP_KERNEL);
3054                 }
3055         }
3056
3057         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3058                 mlme_dbg_ratelimited(sdata,
3059                                      "cancelling AP probe due to a received beacon\n");
3060                 ieee80211_reset_ap_probe(sdata);
3061         }
3062
3063         /*
3064          * Push the beacon loss detection into the future since
3065          * we are processing a beacon from the AP just now.
3066          */
3067         ieee80211_sta_reset_beacon_monitor(sdata);
3068
3069         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3070         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3071                                           len - baselen, false, &elems,
3072                                           care_about_ies, ncrc);
3073
3074         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3075                 bool directed_tim = ieee80211_check_tim(elems.tim,
3076                                                         elems.tim_len,
3077                                                         ifmgd->aid);
3078                 if (directed_tim) {
3079                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3080                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3081                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3082                                         ieee80211_hw_config(local,
3083                                                             IEEE80211_CONF_CHANGE_PS);
3084                                 }
3085                                 ieee80211_send_nullfunc(local, sdata, 0);
3086                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3087                                 local->pspolling = true;
3088
3089                                 /*
3090                                  * Here is assumed that the driver will be
3091                                  * able to send ps-poll frame and receive a
3092                                  * response even though power save mode is
3093                                  * enabled, but some drivers might require
3094                                  * to disable power save here. This needs
3095                                  * to be investigated.
3096                                  */
3097                                 ieee80211_send_pspoll(local, sdata);
3098                         }
3099                 }
3100         }
3101
3102         if (sdata->vif.p2p) {
3103                 struct ieee80211_p2p_noa_attr noa = {};
3104                 int ret;
3105
3106                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3107                                             len - baselen,
3108                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3109                                             (u8 *) &noa, sizeof(noa));
3110                 if (ret >= 2) {
3111                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3112                                 /* valid noa_attr and index changed */
3113                                 sdata->u.mgd.p2p_noa_index = noa.index;
3114                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3115                                 changed |= BSS_CHANGED_P2P_PS;
3116                                 /*
3117                                  * make sure we update all information, the CRC
3118                                  * mechanism doesn't look at P2P attributes.
3119                                  */
3120                                 ifmgd->beacon_crc_valid = false;
3121                         }
3122                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3123                         /* noa_attr not found and we had valid noa_attr before */
3124                         sdata->u.mgd.p2p_noa_index = -1;
3125                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3126                         changed |= BSS_CHANGED_P2P_PS;
3127                         ifmgd->beacon_crc_valid = false;
3128                 }
3129         }
3130
3131         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3132                 return;
3133         ifmgd->beacon_crc = ncrc;
3134         ifmgd->beacon_crc_valid = true;
3135
3136         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3137
3138         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3139                                          &elems, true);
3140
3141         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3142             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3143                                      elems.wmm_param_len))
3144                 changed |= BSS_CHANGED_QOS;
3145
3146         /*
3147          * If we haven't had a beacon before, tell the driver about the
3148          * DTIM period (and beacon timing if desired) now.
3149          */
3150         if (!ifmgd->have_beacon) {
3151                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3152                 if (elems.tim)
3153                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3154                 else
3155                         bss_conf->dtim_period = 1;
3156
3157                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3158                         sdata->vif.bss_conf.sync_tsf =
3159                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3160                         sdata->vif.bss_conf.sync_device_ts =
3161                                 rx_status->device_timestamp;
3162                         if (elems.tim)
3163                                 sdata->vif.bss_conf.sync_dtim_count =
3164                                         elems.tim->dtim_count;
3165                         else
3166                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3167                 }
3168
3169                 changed |= BSS_CHANGED_BEACON_INFO;
3170                 ifmgd->have_beacon = true;
3171
3172                 mutex_lock(&local->iflist_mtx);
3173                 ieee80211_recalc_ps(local, -1);
3174                 mutex_unlock(&local->iflist_mtx);
3175
3176                 ieee80211_recalc_ps_vif(sdata);
3177         }
3178
3179         if (elems.erp_info) {
3180                 erp_valid = true;
3181                 erp_value = elems.erp_info[0];
3182         } else {
3183                 erp_valid = false;
3184         }
3185         changed |= ieee80211_handle_bss_capability(sdata,
3186                         le16_to_cpu(mgmt->u.beacon.capab_info),
3187                         erp_valid, erp_value);
3188
3189         mutex_lock(&local->sta_mtx);
3190         sta = sta_info_get(sdata, bssid);
3191
3192         if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3193                                 elems.vht_operation, bssid, &changed)) {
3194                 mutex_unlock(&local->sta_mtx);
3195                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3196                                        WLAN_REASON_DEAUTH_LEAVING,
3197                                        true, deauth_buf);
3198                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3199                                       sizeof(deauth_buf));
3200                 return;
3201         }
3202
3203         if (sta && elems.opmode_notif)
3204                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3205                                             rx_status->band, true);
3206         mutex_unlock(&local->sta_mtx);
3207
3208         if (elems.country_elem && elems.pwr_constr_elem &&
3209             mgmt->u.probe_resp.capab_info &
3210                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3211                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3212                                                        elems.country_elem,
3213                                                        elems.country_elem_len,
3214                                                        elems.pwr_constr_elem);
3215
3216         ieee80211_bss_info_change_notify(sdata, changed);
3217 }
3218
3219 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3220                                   struct sk_buff *skb)
3221 {
3222         struct ieee80211_rx_status *rx_status;
3223         struct ieee80211_mgmt *mgmt;
3224         u16 fc;
3225         struct ieee802_11_elems elems;
3226         int ies_len;
3227
3228         rx_status = (struct ieee80211_rx_status *) skb->cb;
3229         mgmt = (struct ieee80211_mgmt *) skb->data;
3230         fc = le16_to_cpu(mgmt->frame_control);
3231
3232         sdata_lock(sdata);
3233
3234         switch (fc & IEEE80211_FCTL_STYPE) {
3235         case IEEE80211_STYPE_BEACON:
3236                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3237                 break;
3238         case IEEE80211_STYPE_PROBE_RESP:
3239                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3240                 break;
3241         case IEEE80211_STYPE_AUTH:
3242                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3243                 break;
3244         case IEEE80211_STYPE_DEAUTH:
3245                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3246                 break;
3247         case IEEE80211_STYPE_DISASSOC:
3248                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3249                 break;
3250         case IEEE80211_STYPE_ASSOC_RESP:
3251         case IEEE80211_STYPE_REASSOC_RESP:
3252                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3253                 break;
3254         case IEEE80211_STYPE_ACTION:
3255                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3256                         ies_len = skb->len -
3257                                   offsetof(struct ieee80211_mgmt,
3258                                            u.action.u.chan_switch.variable);
3259
3260                         if (ies_len < 0)
3261                                 break;
3262
3263                         ieee802_11_parse_elems(
3264                                 mgmt->u.action.u.chan_switch.variable,
3265                                 ies_len, true, &elems);
3266
3267                         if (elems.parse_error)
3268                                 break;
3269
3270                         ieee80211_sta_process_chanswitch(sdata,
3271                                                          rx_status->mactime,
3272                                                          &elems, false);
3273                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3274                         ies_len = skb->len -
3275                                   offsetof(struct ieee80211_mgmt,
3276                                            u.action.u.ext_chan_switch.variable);
3277
3278                         if (ies_len < 0)
3279                                 break;
3280
3281                         ieee802_11_parse_elems(
3282                                 mgmt->u.action.u.ext_chan_switch.variable,
3283                                 ies_len, true, &elems);
3284
3285                         if (elems.parse_error)
3286                                 break;
3287
3288                         /* for the handling code pretend this was also an IE */
3289                         elems.ext_chansw_ie =
3290                                 &mgmt->u.action.u.ext_chan_switch.data;
3291
3292                         ieee80211_sta_process_chanswitch(sdata,
3293                                                          rx_status->mactime,
3294                                                          &elems, false);
3295                 }
3296                 break;
3297         }
3298         sdata_unlock(sdata);
3299 }
3300
3301 static void ieee80211_sta_timer(unsigned long data)
3302 {
3303         struct ieee80211_sub_if_data *sdata =
3304                 (struct ieee80211_sub_if_data *) data;
3305
3306         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3307 }
3308
3309 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3310                                           u8 *bssid, u8 reason, bool tx)
3311 {
3312         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3313
3314         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3315                                tx, frame_buf);
3316
3317         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3318                               IEEE80211_DEAUTH_FRAME_LEN);
3319 }
3320
3321 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3322 {
3323         struct ieee80211_local *local = sdata->local;
3324         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3325         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3326         u32 tx_flags = 0;
3327
3328         sdata_assert_lock(sdata);
3329
3330         if (WARN_ON_ONCE(!auth_data))
3331                 return -EINVAL;
3332
3333         auth_data->tries++;
3334
3335         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3336                 sdata_info(sdata, "authentication with %pM timed out\n",
3337                            auth_data->bss->bssid);
3338
3339                 /*
3340                  * Most likely AP is not in the range so remove the
3341                  * bss struct for that AP.
3342                  */
3343                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3344
3345                 return -ETIMEDOUT;
3346         }
3347
3348         drv_mgd_prepare_tx(local, sdata);
3349
3350         if (auth_data->bss->proberesp_ies) {
3351                 u16 trans = 1;
3352                 u16 status = 0;
3353
3354                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3355                            auth_data->bss->bssid, auth_data->tries,
3356                            IEEE80211_AUTH_MAX_TRIES);
3357
3358                 auth_data->expected_transaction = 2;
3359
3360                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3361                         trans = auth_data->sae_trans;
3362                         status = auth_data->sae_status;
3363                         auth_data->expected_transaction = trans;
3364                 }
3365
3366                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3367                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3368                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3369
3370                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3371                                     auth_data->data, auth_data->data_len,
3372                                     auth_data->bss->bssid,
3373                                     auth_data->bss->bssid, NULL, 0, 0,
3374                                     tx_flags);
3375         } else {
3376                 const u8 *ssidie;
3377
3378                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3379                            auth_data->bss->bssid, auth_data->tries,
3380                            IEEE80211_AUTH_MAX_TRIES);
3381
3382                 rcu_read_lock();
3383                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3384                 if (!ssidie) {
3385                         rcu_read_unlock();
3386                         return -EINVAL;
3387                 }
3388                 /*
3389                  * Direct probe is sent to broadcast address as some APs
3390                  * will not answer to direct packet in unassociated state.
3391                  */
3392                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3393                                          NULL, 0, (u32) -1, true, 0,
3394                                          auth_data->bss->channel, false);
3395                 rcu_read_unlock();
3396         }
3397
3398         if (tx_flags == 0) {
3399                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3400                 auth_data->timeout_started = true;
3401                 run_again(sdata, auth_data->timeout);
3402         } else {
3403                 auth_data->timeout =
3404                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3405                 auth_data->timeout_started = true;
3406                 run_again(sdata, auth_data->timeout);
3407         }
3408
3409         return 0;
3410 }
3411
3412 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3413 {
3414         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3415         struct ieee80211_local *local = sdata->local;
3416
3417         sdata_assert_lock(sdata);
3418
3419         assoc_data->tries++;
3420         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3421                 sdata_info(sdata, "association with %pM timed out\n",
3422                            assoc_data->bss->bssid);
3423
3424                 /*
3425                  * Most likely AP is not in the range so remove the
3426                  * bss struct for that AP.
3427                  */
3428                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3429
3430                 return -ETIMEDOUT;
3431         }
3432
3433         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3434                    assoc_data->bss->bssid, assoc_data->tries,
3435                    IEEE80211_ASSOC_MAX_TRIES);
3436         ieee80211_send_assoc(sdata);
3437
3438         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3439                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3440                 assoc_data->timeout_started = true;
3441                 run_again(sdata, assoc_data->timeout);
3442         } else {
3443                 assoc_data->timeout =
3444                         round_jiffies_up(jiffies +
3445                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3446                 assoc_data->timeout_started = true;
3447                 run_again(sdata, assoc_data->timeout);
3448         }
3449
3450         return 0;
3451 }
3452
3453 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3454                                   __le16 fc, bool acked)
3455 {
3456         struct ieee80211_local *local = sdata->local;
3457
3458         sdata->u.mgd.status_fc = fc;
3459         sdata->u.mgd.status_acked = acked;
3460         sdata->u.mgd.status_received = true;
3461
3462         ieee80211_queue_work(&local->hw, &sdata->work);
3463 }
3464
3465 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3466 {
3467         struct ieee80211_local *local = sdata->local;
3468         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3469
3470         sdata_lock(sdata);
3471
3472         if (ifmgd->status_received) {
3473                 __le16 fc = ifmgd->status_fc;
3474                 bool status_acked = ifmgd->status_acked;
3475
3476                 ifmgd->status_received = false;
3477                 if (ifmgd->auth_data &&
3478                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3479                         if (status_acked) {
3480                                 ifmgd->auth_data->timeout =
3481                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3482                                 run_again(sdata, ifmgd->auth_data->timeout);
3483                         } else {
3484                                 ifmgd->auth_data->timeout = jiffies - 1;
3485                         }
3486                         ifmgd->auth_data->timeout_started = true;
3487                 } else if (ifmgd->assoc_data &&
3488                            (ieee80211_is_assoc_req(fc) ||
3489                             ieee80211_is_reassoc_req(fc))) {
3490                         if (status_acked) {
3491                                 ifmgd->assoc_data->timeout =
3492                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3493                                 run_again(sdata, ifmgd->assoc_data->timeout);
3494                         } else {
3495                                 ifmgd->assoc_data->timeout = jiffies - 1;
3496                         }
3497                         ifmgd->assoc_data->timeout_started = true;
3498                 }
3499         }
3500
3501         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3502             time_after(jiffies, ifmgd->auth_data->timeout)) {
3503                 if (ifmgd->auth_data->done) {
3504                         /*
3505                          * ok ... we waited for assoc but userspace didn't,
3506                          * so let's just kill the auth data
3507                          */
3508                         ieee80211_destroy_auth_data(sdata, false);
3509                 } else if (ieee80211_probe_auth(sdata)) {
3510                         u8 bssid[ETH_ALEN];
3511
3512                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3513
3514                         ieee80211_destroy_auth_data(sdata, false);
3515
3516                         cfg80211_auth_timeout(sdata->dev, bssid);
3517                 }
3518         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3519                 run_again(sdata, ifmgd->auth_data->timeout);
3520
3521         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3522             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3523                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3524                     ieee80211_do_assoc(sdata)) {
3525                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3526
3527                         ieee80211_destroy_assoc_data(sdata, false);
3528                         cfg80211_assoc_timeout(sdata->dev, bss);
3529                 }
3530         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3531                 run_again(sdata, ifmgd->assoc_data->timeout);
3532
3533         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3534             ifmgd->associated) {
3535                 u8 bssid[ETH_ALEN];
3536                 int max_tries;
3537
3538                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3539
3540                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3541                         max_tries = max_nullfunc_tries;
3542                 else
3543                         max_tries = max_probe_tries;
3544
3545                 /* ACK received for nullfunc probing frame */
3546                 if (!ifmgd->probe_send_count)
3547                         ieee80211_reset_ap_probe(sdata);
3548                 else if (ifmgd->nullfunc_failed) {
3549                         if (ifmgd->probe_send_count < max_tries) {
3550                                 mlme_dbg(sdata,
3551                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3552                                          bssid, ifmgd->probe_send_count,
3553                                          max_tries);
3554                                 ieee80211_mgd_probe_ap_send(sdata);
3555                         } else {
3556                                 mlme_dbg(sdata,
3557                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3558                                          bssid);
3559                                 ieee80211_sta_connection_lost(sdata, bssid,
3560                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3561                                         false);
3562                         }
3563                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3564                         run_again(sdata, ifmgd->probe_timeout);
3565                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3566                         mlme_dbg(sdata,
3567                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3568                                  bssid, probe_wait_ms);
3569                         ieee80211_sta_connection_lost(sdata, bssid,
3570                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3571                 } else if (ifmgd->probe_send_count < max_tries) {
3572                         mlme_dbg(sdata,
3573                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3574                                  bssid, probe_wait_ms,
3575                                  ifmgd->probe_send_count, max_tries);
3576                         ieee80211_mgd_probe_ap_send(sdata);
3577                 } else {
3578                         /*
3579                          * We actually lost the connection ... or did we?
3580                          * Let's make sure!
3581                          */
3582                         wiphy_debug(local->hw.wiphy,
3583                                     "%s: No probe response from AP %pM"
3584                                     " after %dms, disconnecting.\n",
3585                                     sdata->name,
3586                                     bssid, probe_wait_ms);
3587
3588                         ieee80211_sta_connection_lost(sdata, bssid,
3589                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3590                 }
3591         }
3592
3593         sdata_unlock(sdata);
3594 }
3595
3596 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3597 {
3598         struct ieee80211_sub_if_data *sdata =
3599                 (struct ieee80211_sub_if_data *) data;
3600         struct ieee80211_local *local = sdata->local;
3601
3602         if (local->quiescing)
3603                 return;
3604
3605         if (sdata->vif.csa_active)
3606                 return;
3607
3608         sdata->u.mgd.connection_loss = false;
3609         ieee80211_queue_work(&sdata->local->hw,
3610                              &sdata->u.mgd.beacon_connection_loss_work);
3611 }
3612
3613 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3614 {
3615         struct ieee80211_sub_if_data *sdata =
3616                 (struct ieee80211_sub_if_data *) data;
3617         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3618         struct ieee80211_local *local = sdata->local;
3619
3620         if (local->quiescing)
3621                 return;
3622
3623         if (sdata->vif.csa_active)
3624                 return;
3625
3626         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3627 }
3628
3629 static void ieee80211_sta_monitor_work(struct work_struct *work)
3630 {
3631         struct ieee80211_sub_if_data *sdata =
3632                 container_of(work, struct ieee80211_sub_if_data,
3633                              u.mgd.monitor_work);
3634
3635         ieee80211_mgd_probe_ap(sdata, false);
3636 }
3637
3638 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3639 {
3640         u32 flags;
3641
3642         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3643                 __ieee80211_stop_poll(sdata);
3644
3645                 /* let's probe the connection once */
3646                 flags = sdata->local->hw.flags;
3647                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3648                         ieee80211_queue_work(&sdata->local->hw,
3649                                              &sdata->u.mgd.monitor_work);
3650                 /* and do all the other regular work too */
3651                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3652         }
3653 }
3654
3655 #ifdef CONFIG_PM
3656 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3657 {
3658         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3659         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3660
3661         sdata_lock(sdata);
3662
3663         if (ifmgd->auth_data || ifmgd->assoc_data) {
3664                 const u8 *bssid = ifmgd->auth_data ?
3665                                 ifmgd->auth_data->bss->bssid :
3666                                 ifmgd->assoc_data->bss->bssid;
3667
3668                 /*
3669                  * If we are trying to authenticate / associate while suspending,
3670                  * cfg80211 won't know and won't actually abort those attempts,
3671                  * thus we need to do that ourselves.
3672                  */
3673                 ieee80211_send_deauth_disassoc(sdata, bssid,
3674                                                IEEE80211_STYPE_DEAUTH,
3675                                                WLAN_REASON_DEAUTH_LEAVING,
3676                                                false, frame_buf);
3677                 if (ifmgd->assoc_data)
3678                         ieee80211_destroy_assoc_data(sdata, false);
3679                 if (ifmgd->auth_data)
3680                         ieee80211_destroy_auth_data(sdata, false);
3681                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3682                                       IEEE80211_DEAUTH_FRAME_LEN);
3683         }
3684
3685         sdata_unlock(sdata);
3686 }
3687
3688 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3689 {
3690         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3691
3692         sdata_lock(sdata);
3693         if (!ifmgd->associated) {
3694                 sdata_unlock(sdata);
3695                 return;
3696         }
3697
3698         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3699                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3700                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3701                 ieee80211_sta_connection_lost(sdata,
3702                                               ifmgd->associated->bssid,
3703                                               WLAN_REASON_UNSPECIFIED,
3704                                               true);
3705                 sdata_unlock(sdata);
3706                 return;
3707         }
3708         sdata_unlock(sdata);
3709 }
3710 #endif
3711
3712 /* interface setup */
3713 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3714 {
3715         struct ieee80211_if_managed *ifmgd;
3716
3717         ifmgd = &sdata->u.mgd;
3718         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3719         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3720         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3721                   ieee80211_beacon_connection_loss_work);
3722         INIT_WORK(&ifmgd->csa_connection_drop_work,
3723                   ieee80211_csa_connection_drop_work);
3724         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3725         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3726                     (unsigned long) sdata);
3727         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3728                     (unsigned long) sdata);
3729         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3730                     (unsigned long) sdata);
3731         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3732                     (unsigned long) sdata);
3733
3734         ifmgd->flags = 0;
3735         ifmgd->powersave = sdata->wdev.ps;
3736         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3737         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3738         ifmgd->p2p_noa_index = -1;
3739
3740         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3741                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3742         else
3743                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3744 }
3745
3746 /* scan finished notification */
3747 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3748 {
3749         struct ieee80211_sub_if_data *sdata;
3750
3751         /* Restart STA timers */
3752         rcu_read_lock();
3753         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3754                 if (ieee80211_sdata_running(sdata))
3755                         ieee80211_restart_sta_timer(sdata);
3756         }
3757         rcu_read_unlock();
3758 }
3759
3760 int ieee80211_max_network_latency(struct notifier_block *nb,
3761                                   unsigned long data, void *dummy)
3762 {
3763         s32 latency_usec = (s32) data;
3764         struct ieee80211_local *local =
3765                 container_of(nb, struct ieee80211_local,
3766                              network_latency_notifier);
3767
3768         mutex_lock(&local->iflist_mtx);
3769         ieee80211_recalc_ps(local, latency_usec);
3770         mutex_unlock(&local->iflist_mtx);
3771
3772         return NOTIFY_OK;
3773 }
3774
3775 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3776                                      struct cfg80211_bss *cbss)
3777 {
3778         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3779         const u8 *ht_cap_ie, *vht_cap_ie;
3780         const struct ieee80211_ht_cap *ht_cap;
3781         const struct ieee80211_vht_cap *vht_cap;
3782         u8 chains = 1;
3783
3784         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3785                 return chains;
3786
3787         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3788         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3789                 ht_cap = (void *)(ht_cap_ie + 2);
3790                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3791                 /*
3792                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3793                  *       "Tx Unequal Modulation Supported" fields.
3794                  */
3795         }
3796
3797         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3798                 return chains;
3799
3800         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3801         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3802                 u8 nss;
3803                 u16 tx_mcs_map;
3804
3805                 vht_cap = (void *)(vht_cap_ie + 2);
3806                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3807                 for (nss = 8; nss > 0; nss--) {
3808                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3809                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3810                                 break;
3811                 }
3812                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3813                 chains = max(chains, nss);
3814         }
3815
3816         return chains;
3817 }
3818
3819 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3820                                   struct cfg80211_bss *cbss)
3821 {
3822         struct ieee80211_local *local = sdata->local;
3823         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3824         const struct ieee80211_ht_operation *ht_oper = NULL;
3825         const struct ieee80211_vht_operation *vht_oper = NULL;
3826         struct ieee80211_supported_band *sband;
3827         struct cfg80211_chan_def chandef;
3828         int ret;
3829
3830         sband = local->hw.wiphy->bands[cbss->channel->band];
3831
3832         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3833                           IEEE80211_STA_DISABLE_80P80MHZ |
3834                           IEEE80211_STA_DISABLE_160MHZ);
3835
3836         rcu_read_lock();
3837
3838         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3839             sband->ht_cap.ht_supported) {
3840                 const u8 *ht_oper_ie, *ht_cap;
3841
3842                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3843                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3844                         ht_oper = (void *)(ht_oper_ie + 2);
3845
3846                 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3847                 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3848                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3849                         ht_oper = NULL;
3850                 }
3851         }
3852
3853         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3854             sband->vht_cap.vht_supported) {
3855                 const u8 *vht_oper_ie, *vht_cap;
3856
3857                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3858                                                    WLAN_EID_VHT_OPERATION);
3859                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3860                         vht_oper = (void *)(vht_oper_ie + 2);
3861                 if (vht_oper && !ht_oper) {
3862                         vht_oper = NULL;
3863                         sdata_info(sdata,
3864                                    "AP advertised VHT without HT, disabling both\n");
3865                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3866                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3867                 }
3868
3869                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3870                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3871                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3872                         vht_oper = NULL;
3873                 }
3874         }
3875
3876         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3877                                                      cbss->channel,
3878                                                      ht_oper, vht_oper,
3879                                                      &chandef, false);
3880
3881         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3882                                       local->rx_chains);
3883
3884         rcu_read_unlock();
3885
3886         /* will change later if needed */
3887         sdata->smps_mode = IEEE80211_SMPS_OFF;
3888
3889         mutex_lock(&local->mtx);
3890         /*
3891          * If this fails (possibly due to channel context sharing
3892          * on incompatible channels, e.g. 80+80 and 160 sharing the
3893          * same control channel) try to use a smaller bandwidth.
3894          */
3895         ret = ieee80211_vif_use_channel(sdata, &chandef,
3896                                         IEEE80211_CHANCTX_SHARED);
3897
3898         /* don't downgrade for 5 and 10 MHz channels, though. */
3899         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3900             chandef.width == NL80211_CHAN_WIDTH_10)
3901                 goto out;
3902
3903         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3904                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3905                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3906                                                 IEEE80211_CHANCTX_SHARED);
3907         }
3908  out:
3909         mutex_unlock(&local->mtx);
3910         return ret;
3911 }
3912
3913 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3914                                      struct cfg80211_bss *cbss, bool assoc)
3915 {
3916         struct ieee80211_local *local = sdata->local;
3917         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3918         struct ieee80211_bss *bss = (void *)cbss->priv;
3919         struct sta_info *new_sta = NULL;
3920         bool have_sta = false;
3921         int err;
3922
3923         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3924                 return -EINVAL;
3925
3926         if (assoc) {
3927                 rcu_read_lock();
3928                 have_sta = sta_info_get(sdata, cbss->bssid);
3929                 rcu_read_unlock();
3930         }
3931
3932         if (!have_sta) {
3933                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3934                 if (!new_sta)
3935                         return -ENOMEM;
3936         }
3937         if (new_sta) {
3938                 u32 rates = 0, basic_rates = 0;
3939                 bool have_higher_than_11mbit;
3940                 int min_rate = INT_MAX, min_rate_index = -1;
3941                 struct ieee80211_chanctx_conf *chanctx_conf;
3942                 struct ieee80211_supported_band *sband;
3943                 const struct cfg80211_bss_ies *ies;
3944                 int shift;
3945                 u32 rate_flags;
3946
3947                 sband = local->hw.wiphy->bands[cbss->channel->band];
3948
3949                 err = ieee80211_prep_channel(sdata, cbss);
3950                 if (err) {
3951                         sta_info_free(local, new_sta);
3952                         return -EINVAL;
3953                 }
3954                 shift = ieee80211_vif_get_shift(&sdata->vif);
3955
3956                 rcu_read_lock();
3957                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3958                 if (WARN_ON(!chanctx_conf)) {
3959                         rcu_read_unlock();
3960                         sta_info_free(local, new_sta);
3961                         return -EINVAL;
3962                 }
3963                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
3964                 rcu_read_unlock();
3965
3966                 ieee80211_get_rates(sband, bss->supp_rates,
3967                                     bss->supp_rates_len,
3968                                     &rates, &basic_rates,
3969                                     &have_higher_than_11mbit,
3970                                     &min_rate, &min_rate_index,
3971                                     shift, rate_flags);
3972
3973                 /*
3974                  * This used to be a workaround for basic rates missing
3975                  * in the association response frame. Now that we no
3976                  * longer use the basic rates from there, it probably
3977                  * doesn't happen any more, but keep the workaround so
3978                  * in case some *other* APs are buggy in different ways
3979                  * we can connect -- with a warning.
3980                  */
3981                 if (!basic_rates && min_rate_index >= 0) {
3982                         sdata_info(sdata,
3983                                    "No basic rates, using min rate instead\n");
3984                         basic_rates = BIT(min_rate_index);
3985                 }
3986
3987                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3988                 sdata->vif.bss_conf.basic_rates = basic_rates;
3989
3990                 /* cf. IEEE 802.11 9.2.12 */
3991                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3992                     have_higher_than_11mbit)
3993                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3994                 else
3995                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3996
3997                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3998
3999                 /* set timing information */
4000                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4001                 rcu_read_lock();
4002                 ies = rcu_dereference(cbss->beacon_ies);
4003                 if (ies) {
4004                         const u8 *tim_ie;
4005
4006                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4007                         sdata->vif.bss_conf.sync_device_ts =
4008                                 bss->device_ts_beacon;
4009                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4010                                                   ies->data, ies->len);
4011                         if (tim_ie && tim_ie[1] >= 2)
4012                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4013                         else
4014                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4015                 } else if (!(local->hw.flags &
4016                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4017                         ies = rcu_dereference(cbss->proberesp_ies);
4018                         /* must be non-NULL since beacon IEs were NULL */
4019                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4020                         sdata->vif.bss_conf.sync_device_ts =
4021                                 bss->device_ts_presp;
4022                         sdata->vif.bss_conf.sync_dtim_count = 0;
4023                 } else {
4024                         sdata->vif.bss_conf.sync_tsf = 0;
4025                         sdata->vif.bss_conf.sync_device_ts = 0;
4026                         sdata->vif.bss_conf.sync_dtim_count = 0;
4027                 }
4028                 rcu_read_unlock();
4029
4030                 /* tell driver about BSSID, basic rates and timing */
4031                 ieee80211_bss_info_change_notify(sdata,
4032                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4033                         BSS_CHANGED_BEACON_INT);
4034
4035                 if (assoc)
4036                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4037
4038                 err = sta_info_insert(new_sta);
4039                 new_sta = NULL;
4040                 if (err) {
4041                         sdata_info(sdata,
4042                                    "failed to insert STA entry for the AP (error %d)\n",
4043                                    err);
4044                         return err;
4045                 }
4046         } else
4047                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4048
4049         return 0;
4050 }
4051
4052 /* config hooks */
4053 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4054                        struct cfg80211_auth_request *req)
4055 {
4056         struct ieee80211_local *local = sdata->local;
4057         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4058         struct ieee80211_mgd_auth_data *auth_data;
4059         u16 auth_alg;
4060         int err;
4061
4062         /* prepare auth data structure */
4063
4064         switch (req->auth_type) {
4065         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4066                 auth_alg = WLAN_AUTH_OPEN;
4067                 break;
4068         case NL80211_AUTHTYPE_SHARED_KEY:
4069                 if (IS_ERR(local->wep_tx_tfm))
4070                         return -EOPNOTSUPP;
4071                 auth_alg = WLAN_AUTH_SHARED_KEY;
4072                 break;
4073         case NL80211_AUTHTYPE_FT:
4074                 auth_alg = WLAN_AUTH_FT;
4075                 break;
4076         case NL80211_AUTHTYPE_NETWORK_EAP:
4077                 auth_alg = WLAN_AUTH_LEAP;
4078                 break;
4079         case NL80211_AUTHTYPE_SAE:
4080                 auth_alg = WLAN_AUTH_SAE;
4081                 break;
4082         default:
4083                 return -EOPNOTSUPP;
4084         }
4085
4086         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4087                             req->ie_len, GFP_KERNEL);
4088         if (!auth_data)
4089                 return -ENOMEM;
4090
4091         auth_data->bss = req->bss;
4092
4093         if (req->sae_data_len >= 4) {
4094                 __le16 *pos = (__le16 *) req->sae_data;
4095                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4096                 auth_data->sae_status = le16_to_cpu(pos[1]);
4097                 memcpy(auth_data->data, req->sae_data + 4,
4098                        req->sae_data_len - 4);
4099                 auth_data->data_len += req->sae_data_len - 4;
4100         }
4101
4102         if (req->ie && req->ie_len) {
4103                 memcpy(&auth_data->data[auth_data->data_len],
4104                        req->ie, req->ie_len);
4105                 auth_data->data_len += req->ie_len;
4106         }
4107
4108         if (req->key && req->key_len) {
4109                 auth_data->key_len = req->key_len;
4110                 auth_data->key_idx = req->key_idx;
4111                 memcpy(auth_data->key, req->key, req->key_len);
4112         }
4113
4114         auth_data->algorithm = auth_alg;
4115
4116         /* try to authenticate/probe */
4117
4118         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4119             ifmgd->assoc_data) {
4120                 err = -EBUSY;
4121                 goto err_free;
4122         }
4123
4124         if (ifmgd->auth_data)
4125                 ieee80211_destroy_auth_data(sdata, false);
4126
4127         /* prep auth_data so we don't go into idle on disassoc */
4128         ifmgd->auth_data = auth_data;
4129
4130         if (ifmgd->associated) {
4131                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4132
4133                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4134                                        WLAN_REASON_UNSPECIFIED,
4135                                        false, frame_buf);
4136
4137                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4138                                       sizeof(frame_buf));
4139         }
4140
4141         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4142
4143         err = ieee80211_prep_connection(sdata, req->bss, false);
4144         if (err)
4145                 goto err_clear;
4146
4147         err = ieee80211_probe_auth(sdata);
4148         if (err) {
4149                 sta_info_destroy_addr(sdata, req->bss->bssid);
4150                 goto err_clear;
4151         }
4152
4153         /* hold our own reference */
4154         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4155         return 0;
4156
4157  err_clear:
4158         memset(ifmgd->bssid, 0, ETH_ALEN);
4159         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4160         ifmgd->auth_data = NULL;
4161  err_free:
4162         kfree(auth_data);
4163         return err;
4164 }
4165
4166 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4167                                         const u8 *wmm_param, int len)
4168 {
4169         const u8 *pos;
4170         size_t left;
4171
4172         if (len < 8)
4173                 return false;
4174
4175         if (wmm_param[5] != 1 /* version */)
4176                 return false;
4177
4178         pos = wmm_param + 8;
4179         left = len - 8;
4180
4181         for (; left >= 4; left -= 4, pos += 4) {
4182                 u8 aifsn = pos[0] & 0x0f;
4183                 u8 ecwmin = pos[1] & 0x0f;
4184                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4185                 int aci = (pos[0] >> 5) & 0x03;
4186
4187                 if (aifsn < 2) {
4188                         sdata_info(sdata,
4189                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4190                                    aifsn, aci);
4191                         return false;
4192                 }
4193                 if (ecwmin > ecwmax) {
4194                         sdata_info(sdata,
4195                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4196                                    ecwmin, ecwmax, aci);
4197                         return false;
4198                 }
4199         }
4200
4201         return true;
4202 }
4203
4204 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4205                         struct cfg80211_assoc_request *req)
4206 {
4207         struct ieee80211_local *local = sdata->local;
4208         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4209         struct ieee80211_bss *bss = (void *)req->bss->priv;
4210         struct ieee80211_mgd_assoc_data *assoc_data;
4211         const struct cfg80211_bss_ies *beacon_ies;
4212         struct ieee80211_supported_band *sband;
4213         const u8 *ssidie, *ht_ie, *vht_ie;
4214         int i, err;
4215
4216         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4217         if (!assoc_data)
4218                 return -ENOMEM;
4219
4220         rcu_read_lock();
4221         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4222         if (!ssidie) {
4223                 rcu_read_unlock();
4224                 kfree(assoc_data);
4225                 return -EINVAL;
4226         }
4227         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4228         assoc_data->ssid_len = ssidie[1];
4229         rcu_read_unlock();
4230
4231         if (ifmgd->associated) {
4232                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4233
4234                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4235                                        WLAN_REASON_UNSPECIFIED,
4236                                        false, frame_buf);
4237
4238                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4239                                       sizeof(frame_buf));
4240         }
4241
4242         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4243                 err = -EBUSY;
4244                 goto err_free;
4245         }
4246
4247         if (ifmgd->assoc_data) {
4248                 err = -EBUSY;
4249                 goto err_free;
4250         }
4251
4252         if (ifmgd->auth_data) {
4253                 bool match;
4254
4255                 /* keep sta info, bssid if matching */
4256                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4257                 ieee80211_destroy_auth_data(sdata, match);
4258         }
4259
4260         /* prepare assoc data */
4261
4262         ifmgd->beacon_crc_valid = false;
4263
4264         assoc_data->wmm = bss->wmm_used &&
4265                           (local->hw.queues >= IEEE80211_NUM_ACS);
4266         if (assoc_data->wmm) {
4267                 /* try to check validity of WMM params IE */
4268                 const struct cfg80211_bss_ies *ies;
4269                 const u8 *wp, *start, *end;
4270
4271                 rcu_read_lock();
4272                 ies = rcu_dereference(req->bss->ies);
4273                 start = ies->data;
4274                 end = start + ies->len;
4275
4276                 while (true) {
4277                         wp = cfg80211_find_vendor_ie(
4278                                 WLAN_OUI_MICROSOFT,
4279                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4280                                 start, end - start);
4281                         if (!wp)
4282                                 break;
4283                         start = wp + wp[1] + 2;
4284                         /* if this IE is too short, try the next */
4285                         if (wp[1] <= 4)
4286                                 continue;
4287                         /* if this IE is WMM params, we found what we wanted */
4288                         if (wp[6] == 1)
4289                                 break;
4290                 }
4291
4292                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4293                                                         wp[1] - 2)) {
4294                         assoc_data->wmm = false;
4295                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4296                 }
4297                 rcu_read_unlock();
4298         }
4299
4300         /*
4301          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4302          * We still associate in non-HT mode (11a/b/g) if any one of these
4303          * ciphers is configured as pairwise.
4304          * We can set this to true for non-11n hardware, that'll be checked
4305          * separately along with the peer capabilities.
4306          */
4307         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4308                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4309                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4310                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4311                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4312                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4313                         netdev_info(sdata->dev,
4314                                     "disabling HT/VHT due to WEP/TKIP use\n");
4315                 }
4316         }
4317
4318         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4319                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4320                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4321         }
4322
4323         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4324                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4325
4326         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4327         sband = local->hw.wiphy->bands[req->bss->channel->band];
4328         if (!sband->ht_cap.ht_supported ||
4329             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4330             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4331                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4332                 if (!bss->wmm_used &&
4333                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4334                         netdev_info(sdata->dev,
4335                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4336         }
4337
4338         /* disable VHT if we don't support it or the AP doesn't use WMM */
4339         if (!sband->vht_cap.vht_supported ||
4340             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4341             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4342                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4343                 if (!bss->wmm_used &&
4344                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4345                         netdev_info(sdata->dev,
4346                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4347         }
4348
4349         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4350         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4351                sizeof(ifmgd->ht_capa_mask));
4352
4353         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4354         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4355                sizeof(ifmgd->vht_capa_mask));
4356
4357         if (req->ie && req->ie_len) {
4358                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4359                 assoc_data->ie_len = req->ie_len;
4360         }
4361
4362         assoc_data->bss = req->bss;
4363
4364         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4365                 if (ifmgd->powersave)
4366                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4367                 else
4368                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4369         } else
4370                 sdata->smps_mode = ifmgd->req_smps;
4371
4372         assoc_data->capability = req->bss->capability;
4373         assoc_data->supp_rates = bss->supp_rates;
4374         assoc_data->supp_rates_len = bss->supp_rates_len;
4375
4376         rcu_read_lock();
4377         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4378         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4379                 assoc_data->ap_ht_param =
4380                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4381         else
4382                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4383         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4384         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4385                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4386                        sizeof(struct ieee80211_vht_cap));
4387         else
4388                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4389         rcu_read_unlock();
4390
4391         if (bss->wmm_used && bss->uapsd_supported &&
4392             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
4393             sdata->wmm_acm != 0xff) {
4394                 assoc_data->uapsd = true;
4395                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4396         } else {
4397                 assoc_data->uapsd = false;
4398                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4399         }
4400
4401         if (req->prev_bssid)
4402                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4403
4404         if (req->use_mfp) {
4405                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4406                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4407         } else {
4408                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4409                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4410         }
4411
4412         if (req->crypto.control_port)
4413                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4414         else
4415                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4416
4417         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4418         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4419         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4420                                                         sdata->vif.type);
4421
4422         /* kick off associate process */
4423
4424         ifmgd->assoc_data = assoc_data;
4425         ifmgd->dtim_period = 0;
4426         ifmgd->have_beacon = false;
4427
4428         err = ieee80211_prep_connection(sdata, req->bss, true);
4429         if (err)
4430                 goto err_clear;
4431
4432         rcu_read_lock();
4433         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4434
4435         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4436             !beacon_ies) {
4437                 /*
4438                  * Wait up to one beacon interval ...
4439                  * should this be more if we miss one?
4440                  */
4441                 sdata_info(sdata, "waiting for beacon from %pM\n",
4442                            ifmgd->bssid);
4443                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4444                 assoc_data->timeout_started = true;
4445                 assoc_data->need_beacon = true;
4446         } else if (beacon_ies) {
4447                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4448                                                     beacon_ies->data,
4449                                                     beacon_ies->len);
4450                 u8 dtim_count = 0;
4451
4452                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4453                         const struct ieee80211_tim_ie *tim;
4454                         tim = (void *)(tim_ie + 2);
4455                         ifmgd->dtim_period = tim->dtim_period;
4456                         dtim_count = tim->dtim_count;
4457                 }
4458                 ifmgd->have_beacon = true;
4459                 assoc_data->timeout = jiffies;
4460                 assoc_data->timeout_started = true;
4461
4462                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4463                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4464                         sdata->vif.bss_conf.sync_device_ts =
4465                                 bss->device_ts_beacon;
4466                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4467                 }
4468         } else {
4469                 assoc_data->timeout = jiffies;
4470                 assoc_data->timeout_started = true;
4471         }
4472         rcu_read_unlock();
4473
4474         run_again(sdata, assoc_data->timeout);
4475
4476         if (bss->corrupt_data) {
4477                 char *corrupt_type = "data";
4478                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4479                         if (bss->corrupt_data &
4480                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4481                                 corrupt_type = "beacon and probe response";
4482                         else
4483                                 corrupt_type = "beacon";
4484                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4485                         corrupt_type = "probe response";
4486                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4487                            corrupt_type);
4488         }
4489
4490         return 0;
4491  err_clear:
4492         memset(ifmgd->bssid, 0, ETH_ALEN);
4493         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4494         ifmgd->assoc_data = NULL;
4495  err_free:
4496         kfree(assoc_data);
4497         return err;
4498 }
4499
4500 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4501                          struct cfg80211_deauth_request *req)
4502 {
4503         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4504         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4505         bool tx = !req->local_state_change;
4506
4507         if (ifmgd->auth_data &&
4508             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4509                 sdata_info(sdata,
4510                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4511                            req->bssid, req->reason_code,
4512                            ieee80211_get_reason_code_string(req->reason_code));
4513
4514                 drv_mgd_prepare_tx(sdata->local, sdata);
4515                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4516                                                IEEE80211_STYPE_DEAUTH,
4517                                                req->reason_code, tx,
4518                                                frame_buf);
4519                 ieee80211_destroy_auth_data(sdata, false);
4520                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4521                                       IEEE80211_DEAUTH_FRAME_LEN);
4522
4523                 return 0;
4524         }
4525
4526         if (ifmgd->associated &&
4527             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4528                 sdata_info(sdata,
4529                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4530                            req->bssid, req->reason_code,
4531                            ieee80211_get_reason_code_string(req->reason_code));
4532
4533                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4534                                        req->reason_code, tx, frame_buf);
4535                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4536                                       IEEE80211_DEAUTH_FRAME_LEN);
4537                 return 0;
4538         }
4539
4540         return -ENOTCONN;
4541 }
4542
4543 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4544                            struct cfg80211_disassoc_request *req)
4545 {
4546         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4547         u8 bssid[ETH_ALEN];
4548         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4549
4550         /*
4551          * cfg80211 should catch this ... but it's racy since
4552          * we can receive a disassoc frame, process it, hand it
4553          * to cfg80211 while that's in a locked section already
4554          * trying to tell us that the user wants to disconnect.
4555          */
4556         if (ifmgd->associated != req->bss)
4557                 return -ENOLINK;
4558
4559         sdata_info(sdata,
4560                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4561                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4562
4563         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4564         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4565                                req->reason_code, !req->local_state_change,
4566                                frame_buf);
4567
4568         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4569                               IEEE80211_DEAUTH_FRAME_LEN);
4570
4571         return 0;
4572 }
4573
4574 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4575 {
4576         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4577
4578         /*
4579          * Make sure some work items will not run after this,
4580          * they will not do anything but might not have been
4581          * cancelled when disconnecting.
4582          */
4583         cancel_work_sync(&ifmgd->monitor_work);
4584         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4585         cancel_work_sync(&ifmgd->request_smps_work);
4586         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4587         cancel_work_sync(&ifmgd->chswitch_work);
4588
4589         sdata_lock(sdata);
4590         if (ifmgd->assoc_data) {
4591                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4592                 ieee80211_destroy_assoc_data(sdata, false);
4593                 cfg80211_assoc_timeout(sdata->dev, bss);
4594         }
4595         if (ifmgd->auth_data)
4596                 ieee80211_destroy_auth_data(sdata, false);
4597         del_timer_sync(&ifmgd->timer);
4598         sdata_unlock(sdata);
4599 }
4600
4601 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4602                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4603                                gfp_t gfp)
4604 {
4605         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4606
4607         trace_api_cqm_rssi_notify(sdata, rssi_event);
4608
4609         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4610 }
4611 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);